Child Poverty Dynamics in Seven Nations | Paper Analysis

Child Poverty Dynamics in Seven Nations | Paper Analysis Task: to evaluate the research design, methods of data collection and analysis, and any other ethical or philosophical issues that arise in the specified research paper. Introduction This assignment will focus on the working paper entitled Child Poverty Dynamics in Seven Nations (Bradbury et al, 2000). It will identify and analyse the research design, methodology, data collection and analysis contained within the paper. There will also be an assessment of philosophical and ethical issues as well as a comparison with other documents of a similar nature. The paper is a comparative study examining how children move in and out of poverty. Research Design The authors of this paper are concerned with child poverty and how children in different countries move in and out of poverty. They maintain that state welfare provision operates more effectively to reduce child poverty when it has prior research knowledge of what causes children to move in and out of poverty The research uses standard relative poverty definitions and examines the mobility rate of the poorest fifth of children from, Britain, the USA, Germany, Ireland, Spain, Hungary and Russia. It is usual at the design stage of a project to decide what approach one is going to take to the research. This is because different epistemological and philosophical assumptions are an inherent part of any approach to research ( Bryman, 2004). At a general level the study is an inter-societal comparison of the dynamics of poverty. Inter-societal comparisons look at the similarities and differences which countries display. Numbers of such studies have been undertaken, a well known recent one o f these is Esping-Anderson’s (1990) research into the welfare regimes of different countries. Comparative studies have a long history in sociology, e.g. Weber’s work on religion (1930, 1965) and Durkheim’s work on suicide (1952). Comparative studies are a big part of research into poverty, whether this is the traditional notion of poverty as a lack of disposable income, or whether it is the more contemporary concept of social exclusion (Berghman, 1995). Bradbury et al (2000) acknowledge that they have taken a rather broad brush approach in their study and that there are some problems with this, nevertheless they maintain that charting the flow in and out of poverty cross nationally is useful for policy making that aims to reduce the number of children who are poor. The researchers believe that studying poverty from the vantage point of children needs little or no justification because children represent a country’s future. It might be argued however, that is a rather Eurocentric view and may not necessarily be held in all the countries in the study. The researchers further defend their choice of method in the following way: Comparisons across countries provide a reference point for assessing the results for any single country, for example whether a particular statistic is large or small. Cross-national analysis also raises provocative questions about whether differences in outcomes are due to, say, differences in policy regimes or differences in population characteristics. Of course the usefulness of crossnational analysis relies on having good data, and making data comparable may require compromises in the depth of analysis which would not be required in a single country study. (The trade-off depends on the number of countries considered.) Our paper illustrates the various strengths – and weaknesses – of taking a cross-national perspective (Bradbury et al, 2000, p.7-8). The authors thus express a generally held view that comparative research does have integral strengths and weaknesses, the following analysis hopes to demonstrate whether or not the strengths of this research project outweigh any weaknesses it may have.. Methods of Data Collection The primary data source for this study is panel data drawn from the seven nations involved. This data is largely household survey data and is therefore the income levels are those given by heads of households. The researchers maintain that there study is complementary to one undertaken by Duncan et al (1993). The studies differ in that Duncan et al’s work concentrates on the family as the unit of analysis whereas Bradbury et al (2000) concentrate on the child. The units of analysis are children under the age of 18. The data sets refer to the early 1990s[1] with the most recent year being 1996. The researchers want to use the data to compare poverty dynamics between one year and the next, so they looked at data from two years across the seven nations. The data sets differ, with four countries, Germany, Hungary, Britain and the US providing data spanning five years and data from Germany and the US spanning ten years. This means that some countries receive a deeper analysis than others because they collect more data. The income figures provided by households are used as the income of the child with relevant adjustments for household needs. Table 1 below gives a summary description of each of the data sets used. Bradbury et al, 2000 pps 10-11 This table gives an overview of the data that the researchers used in their comparative study. The researchers chose the following features from which to compare the data for different countries: †¦the type of longitudinal survey, the period to which incomes refer, the definition(s) of income available, and two statistics summarising sample size (Bradbury et al, 2000, p.11). The chief indicator of whether a child is living in poverty and how a child moves in and out of poverty are the income measures that are available. The researchers point out however that there are differences between countries on how this is assessed i.e. whether income recorded is before or after any deductions for tax etc. They acknowledge that such differences have clear implications for differences in poverty dynamics but they do not elucidate what this is.[2] This lessens any faith that one might have in their methods of data collection because there is no explanation of how this affects poverty dynamics. Income is recorded as net except in the case of Ireland and the US. The researchers say that net income for Britain cannot be recorded in all cases and this causes a reduction in sample size, with possible resulting implications of difference (?). Only two countries, Spain and Russia, provide evidence of household expenditure in addition to household income and arguably this is a weakness in the data set as levels of expenditure may differ widely from country to country and is a greater indication of the distinction between absolute and relative poverty (Giddens, 2001).[3] Again this might evidence greater discrepancies across nations if more of such data were available and this will raise questions as to the reliability of the findings of the study.The study only uses disposable income as a measurement of poverty, In a sense this is a step back in terms of theoretical development as Berghman (1995) has said the focus has shifted from simply financial poverty to whether a person can fully participate in the society to which they belong. This is not referred to in Bradshaw et al’s study and as such might be said to evidence a weakness in their choice of conceptual indicators. While the measure did work for the variables that the researchers were interested in it is nevertheless a narrow way of measuring child poverty. This is especially the case when one considers the researchers’ acknowledgement that they have no single comparable method of measuring income across the seven nations and this raises questions about the internal validity of their methods. Data Analysis Techniques The study uses quantitative data and the study is quite large using household panels from seven nations. The researchers argue that this not only provides them with a cross national comparison of how and why children enter and leave poverty but also allows for any serious discrepancies between nations to be identified. The number of households selected for the analysis is between 1 and 2 thousand per country (see table one above). Statistical comparisons are made between child poverty rates, their relative income levels and income inequality. The statistics are similar to those found in an earlier chapter but no details of this are given. Arguably, one wonders why they mention any similarities here as they then go on to say that: †¦they are not fully comparable because there are differences in the definition of the income measure, the year referred to ,the sample, and in most cases even the survey (this is true in Britain, Ireland ,Spain, and the US) (Bradshaw et al, 2000, p.13).[4] The researchers say that they use the median income of children to measure material well being but because their data set and methodology are rather convoluted they have to explain what this is.[5] Their usage of a median is questionable as they later say (p.15 ibid) that: median income levels provide no guide to how incomes vary among children. Their use of arithmetical averages is also questionable as this can obscure the existence of very high and very low incomes, a fact which they also acknowledge.Their methods include the use of a statistical technique known as the Gini coefficient[6] The technique is named after the person who developed it, an Italian statistician called Corrado Gini.[7] The use of the Gini coefficient does tend to show whether income inequality is increasing or decreasing and so it is often used in comparisons between countries. However, its capacity to measure inequality is also determined by how disposable income is dealt with and this information is not av ailable. It is arguable therefore whether the use of the Gini coefficient gives an accurate representation of the data. The use of the Gini coefficient tends to suggest that income inequality for children is substantially different across the seven nations. Western Europe has lower inequality levels than do Russia and America, and there may be further discrepancies here because the Russian data also provides details of household expenditure and this is missing from the American data. Bradshaw et al’s (2000) findings show that with the Gini coefficient income inequality in Germany stands at 0.3 while in America and Russia it is 0.4 a rise of 10 percentage points which the authors say is larger than the overall income inequality of Britain and the United States throughout the whole of the 1980s. However, further questions are raised as to the reliability of the data from the US because the US Census Bureau shows that the calculation of the index of the US was changed in 1992 this led to an upward shift of 0.02 in the coefficient making comparisons after that period misleading.[8] Bradshaw et al (2000) claim that their major finding is a: †¦ significant (but not total) uniformity in patterns of income mobility and poverty dynamics across the seven countries. The key exception is Russia, where the economic transition has led to a much higher degree of mobility (Bradshaw et al, 2000, p.6). Having said this, the authors later go on to demonstrate that rather than there being significant uniformity, there are considerable differences between the seven countries. Their findings indicate that the US has the highest rate of income inequality which affects the income mobility but as has already been indicated American figures after 1992 may be misleading. Another factor that makes their finding problematic is that the data for all countries is only available for two years, for some five and for two countries it is available over ten years, as the author’s admit longer time spans significantly affect the dynamics of poverty. Income mobility is greater in those countries where the most data is available it is therefore arguably the case the only significant comparison of income mobility is that between America and Germany. The ways in which the data is analysed, is, like the rest of this paper, rather complex. It is not always easy to decide when they are talking about method and when they switch to data analysis techniques as the information tends to be rather mixed together. The complexity of this paper makes it difficult to assess what the author’s may have missed in their analysis, while the authors claim a number of findings from the research there is also evidence to suggest that they could have found the contrary. Conclusion Analysing this research paper has been a problematic task. The authors continually refer back to other papers/chapters in the collection of which this paper is a part but because they do not give sufficient information on what they are referring to it might be argued that it is pointless referring back to work that is not available for comparison. The structure of this paper is confusing it does not give clear indications as to when it goes from research design, to data collection, to analysis. Discussion of the issues is ongoing and at times repetitive. There are significant weaknesses in this paper, there is little discussion of ethics as they use secondary data analysis but by their own admission there are significant differences and discrepancies in the data and this leads to the view that the both the reliability and validity of the methodology and findings are questionable. On the positive side the researchers do recognise that there are weaknesses in the data set and that this may affect the findings. There are points where the researchers (arguably at least) make claims for their data that are difficult to substantiate e.g. that there are significant similarities between patterns of income mobility across the seven countries. This claim does not really hold up in view of their further analysis of the data which lists the differences between countries. In addition to this much of the data relating to the US could, according to the US Census Bureau, be misleading. Finally the constant referring back to other papers without elucidating the issues does not help the researchers to make their case and their use of income as a major conceptual indicator does not really tell the reader how poverty affects the lives and well being of the children who are meant to be the focus of the research. Bibliography Berghman, J. 1995 â€Å"Social Exclusion in Europe: Policy, context and analytical framework† in Room, R. ed Beyond the Threshold: The Measurement and Analysis of Social Exclusion University of Bristol, Policy Press Bradbury, Bruce, Stephen P. Jenkins and John Micklewright (2000), ‘Child Poverty Dynamics in Seven Nations’. Innocenti Working Paper, No. 78 Florence: UNICEF Innocenti Research Centre. Bryman, A 2nd ed. 2004 Social Research Methods Oxford, Oxford University Press Duncan, G.J., Gustafsson, B., Hauser, R., Schmauss, G., Messinger, H., Muffels, R., Nolan, B., and Ray, J.-C. (1993). ‘Poverty Dynamics in Eight Countries’. Journal of Population Economics, 6: 295–34. Durkheim, E. 1952 Suicide London, Routledge Esping-Anderson 1990 The Three Worlds of Welfare Capitalism Cambridge, Polity Giddens, A 4th ed 2001 Sociology Cambridge, Polity Weber, M. 1930 The Protestant Ethic and the Spirit of Capitalism London, George Allen and Unwin Weber, M., 1965 The Sociology of Religion London, Methuen http://en.wikipedia.org/wiki/Gini_coefficient accessed 28/4/06 http://www.census.gov/hhes/income/histinc/ie6.html http://hampshire.edu/~apmNS/design/RESOURCES accessed 28/4/06 1 Footnotes [1] This is the terminology used by the researchers see page 10 of the study [2] This working paper apparently forms part of a collection of such papers on child poverty. The researchers continually refer back to issues mentioned in other papers without elucidating what these issues are. [3] Again the paper refers back to issues covered in other papers without indicating what these issues are. [4] For example, the UK figures in BJM Chapter 3 (the UK is defined as Britain and Northern Ireland) are based on the Family Expenditure Survey while the results for Britain in this paper are based on the British Household Panel Survey. [5] By ‘median income for children’ we mean the median of the distribution of children, ranked by the value of equivalised income of their household (p, 15 ibid). [6] This is a measure of inequality of distribution which is often used in the measurement of income levels. It is a measure between 0 and 1 where 0 corresponds to complete equality and 1 to complete inequality [7] http://en.wikipedia.org/wiki/Gini_coefficient accessed 28/4/06 [8] http://www.census.gov/hhes/income/histinc/ie6.html Ten Critical Traits of Group Dynamics | Article Analysis Ten Critical Traits of Group Dynamics | Article Analysis With the industrial revolution and latest globalisation effects, competitive nature of businesses has increased more than ever. In order to survive in this modern competitive world, businesses must find solution to their problems faster and also it is more important to do their work more effectively. With that companies have identified that collaboration or in other words, group or team works will find more creative solutions for the problems that they are facing as modern day businesses. Therefore more and more companies nowadays use teams as a part of their organisational strategies. On the other hand as the Article has mentioned in its introduction, the issue is, putting some people together and expecting them to work effectively as a group would rarely work. Therefore understanding the term Group Dynamics and Group Processes and effectively manage them in groups is becoming more important. The article Ten Critical Traits of Group Dynamics which was written by Helene F. Uhlfelder who is a PhD holder in educational psychology has acknowledged the importance of identifying and improving the Dynamics of groups and teams in organisations in order to improve their effectiveness and performance. Further the author has introduced 10 critical traits that can be used to categorize group dynamics. Finally the article has mentioned the importance of assessing groups regularly in order to find issues that are facing groups and how those traits can be used to improve group dynamics in order to build effective teams. Main objective of this assignment is to summarize the given article giving my opinion on the main argument of the article. For that task various sources will be researched including text books, online journal articles and some other web sites. And the complete article will be summarized in a critical manner giving my views on necessary points using the research findings and my own experiences on the subject matter. The Main Argument of the Article This article mainly discusses the importance of 10 traits that have been identified by the author, which can be used to categorize dynamics of groups. According to the author these traits can be used to identify any areas that groups need to improve and areas that they are good at. The author argues that by doing so groups or teams will be able to work together more effectively and increase their performance levels. When analysing the article it can be seen that the author has successfully explained her argument more clearly with providing examples and covering many supplementary topics which are required to further clarify and make it easy to understand the main argument for the audience. Helene Uhlfelder has covered many technological terms like Group Dynamics, Group Process, and has defined the difference between Group and Team before explaining about the 10 critical traits. Although the article has explained group dynamics and group process before explaining what is group and team, as I believe in order the article to be more logical the author could have explained terms like Group and Team first. If the author has assumed that the readers having the knowledge about those terms then she could not have covered them later. Anyhow to begin with explaining the term group and team would be appropriate. Group and Team The term group is defined in the article as situations where two or more people coming together in order to achieve a common purpose. Further it is mentioned that in a group people should interact each other, depend on each other and they should have a task to realize. According to the article the team also a group, that is in a work environment. The author has mentioned various characteristics that are possessed by teams. It is and intact social system with boundaries. Therefore who is in the team and outside the team can be clearly identifiable. There is interdependency among members. Members are collectively responsible for the tasks to be performed. Operates in an organisational context and therefore members have relationship with other members of the organisation. It is obvious that the author has comprehensively explained the terms group and team using various sources and in different contexts like systems terms. But she has overlooked the theory of group formation, which could have added great value addition to the article. As the author has mentioned various stages during some parts of the article, it would be a necessary part to be explained. Group Formation According to (Luthans, 2008) there are five stages that are generally recognized as stages of group formation. Forming this stage is characterized by uncertainty and confusion. Members are testing the appropriate behaviour for the team. Storming in this stage leadership will be determined. Intragroup conflicts are common. Norming Members settle down into conformity and cooperation. Performing The group will perform the task that they were grouped. Adjourning After the task is completed group will disband. Group Dynamics and Process According to the author either positive or negative, group dynamics exists in every group and hence teams. Although authors definition about group dynamics and processes a bit confusing at the end of that particular section she has given a simple explanation to identify those terms distinctly. According to that group processes are simply referred to as specific processes used by group members and leaders whereas group dynamic is defined as forces and dynamics of the group as a whole. It is found in literature research that the term Group Dynamic has been defined in many different ways. According to (Forsyth, 2010) it was first defined by Kurt Lewin, as the processes of the ways groups and individuals act and react to changing circumstances. According (Luthans, 2008) another view on group dynamic identifies it from the viewpoint of the internal nature of groups like how they are formed, structure and processes, how groups function and affect its members After explaining basic definitions and concepts the author moves her discussion into the main content of this article, the 10 critical traits. Ten Critical Traits According to the author, using 10 critical traits approach it is possible to characterize group dynamics and identify issues that are faced by groups. Those 10 critical traits include, safety, inclusion, free-interaction, appropriate level of interdependence, cohesiveness, trust, conflict resolution, influence, accomplishment, and growth. Helen Uhlfelder has explained them comprehensively using examples to make them easy to understand by the readers. Safety according to this trait team members need to feel safe within their teams and members of the team should be safe from any disruptive behaviour of other team members. Inclusion all members should be allowed to participate with equal opportunities. Everyone should be taken as members of the group and efforts should be taken in order to include new and quiet members. Free interaction there should not be any restrictions on which members interact with which members and every member should be allowed to interact with others. According to the author teams can become less effective when only few members are allowed to interact with the leader. Appropriate level of interdependence there should be an appropriate balance between individual needs and group needs. It is mentioned there the important of sense of belonging and affiliation that comes from being interdependence as well as maintaining individual identity. Cohesiveness members should feel as they are a part of a team. Without the attraction of cohesiveness a group can fall apart. Therefore it is very important that members having a bond or affiliation among them. Trust team members should trust each other and they should trust the leader. There should be consistency between what they say and do. Conflict resolution as any team could face conflicts at any stage there should be a way to resolve those conflicts in order to continue the team work. Influence there should be ability for team members to influence other members. They should be able to motivate each other. If there is no method to influence members through usage of reward and punishment productivity could be minimized. As the author has mentioned it is very important to make sure that influence will not be confused as control because controlling can lead to group problems. Accomplishment team should be able to complete its tasks. They should possess skills, knowledge to do their tasks. If they cannot perform their duties frustration would lead to conflict. Growth As in any situations group members should have opportunities to grow. Also as a team they should be able to learn and growth. Otherwise boredom can result in failure in the group. When looking at those traits it is obvious that those traits in nature would help teams to achieve its goals by eliminating group issues. But one weakness of this finding is that the author has not ranked the order of importance of these traits. Perhaps one could argue that these all could be equally important. But according to my point of view some traits are certainly superior or more important than others. For example cohesiveness, conflict resolution, etc. could be more important than growth or influence, because first, the group must work together and achieve their goals. Other things like growth, etc. comes next to that. However it can be clearly said that these 10 traits would (although few traits could be more important than others) help groups or teams to achieve their goals and improve performances. Benefits of 10 Critical Traits According to the author these 10 traits can help teams or groups in great ways by helping them to identify weaknesses and strength of their group dynamics. Therefore she suggests that organisations can use a form that includes those 10 critical traits in order to evaluate teams. According to the article teams can be assessed in 5 scores continuum. Also it is important to assess teams on regular basis in order to keep and improve their performance levels. As the author explains, this evaluation can be done by any person who is not in the team, given that he has required evaluation skills. Further it is noted there that this tool can be used to evaluate a team in any development stage and find out their dynamics and processes in order to improve them. There are several steps that need to be taken after evaluation is done, The assessor should meet team members and provide reason for the score that they have got for each criterion. Appropriate actions should be taken for traits that are scored below 3. Action plans can be implemented to resolve issues. Team should celebrate scores over 3 and reinforce them in order to retain and improve performance. Last step is to follow this procedure regularly again and again after agreed time period. As I understand this is the most important part of this article, because this can be really used by any team in real world to improve their performances. Instructions are clearly given using examples. Therefore nobody would find any difficulties in implementing this. Ultimately through this procedure teams will be able to improve group dynamics and group processes and will be able to build powerful teams and improve their performance level. But there are some drawbacks in this method itself as it has not addressed all issues that could affect the performance of groups or teams. Shortcomings of the 10 Traits Method When analysing the article in depth it is clear that the author has failed to identify some of the important aspects of group and team management that are identified by other researchers and authors. Those aspects could directly affect the outcome of the group in terms of performance and effectiveness. For an example phenomenon like groupthink and groupshift that could hinder the ability of the group to come into quality decisions by evaluating alternatives objectively. According to (Robbins, Millett, Waters-Marsh, 2004) groupthink is related to the group norms. It describes that with the pressure from group to conformity group may eliminate unusual, minority or unpopular views from evaluating when making decision. Groupshift is a situation where when group arriving at a decision they could go for more risky decision as members initial positions are exaggerated toward more extreme positions. Further (Robbins, Millett, Waters-Marsh, 2004) has identified many factors that could affect group performances than the group dynamics that have been identified by the author of the article through her 10 critical traits. Size of the group, availability of resources for a group to perform, effects of social loafing, etc. could affect the outcome of groups greatly. From the shortcomings mentioned earlier it is clear that the phenomenon of groupthink could clearly contradict with cohesiveness trait that she has mentioned in the article. She has mentioned that cohesiveness as an important dynamic in performance. Without cohesiveness a group can fall apart. But she has failed to mention the limit of cohesiveness because as mentioned earlier, extreme cohesiveness can cause groupthink and ultimately affect the effective decision making in the group. Conclusion Putting some people together and expecting them to work effectively as a group would rarely work. Therefore understanding the term Group Dynamics and effectively manage them in groups is important. The author of the article has mainly discussed the importance of her 10 traits method in categorizing group dynamics in order to identify and manage any areas that a group/team need to improve or they are good at. The author argues that by doing so groups or teams will be able to work together more effectively and increase their performance levels. The article has organized its arguments in a logical manner and has introduced many theories and concepts that need to understand the main argument of the article. Apart from few adjustments that I suggested in the analysis part of this assignment, it can be concluded that the author has succeeded in those aspects. Further the article has written in simple English that is a good point because readers will be able to understand the content of this article easily. In addition to that the author has provided lot of examples to make readers understand complex theories and concepts more clearly. When critically evaluating the article, it is found that those 10 critical traits are actually important and very practical in evaluating and managing group performances except for few drawbacks that were discussed in the body of this assignment. Those drawbacks include the failure to mention some of the important aspects that could affect the performance of groups, like groupthink, the size of the group, effects of social loafing, etc. Finally it can be concluded that if any organisation follows the method that the author has suggested to evaluate group/team dynamics and manage them with taking care of the additional points that I have mentioned earlier, organisations will be able to increase performance and effectiveness of their groups/teams.

A Review of Laser Processes Used in Solar Cell Fabrication

A Review of Laser Processes Used in Solar Cell Fabrication Abstract There are many different laser techniques that can be used in the production of solar cells. By examining the research which the various solar cells were fabricated with laser technique, it is possible to understand the pros and cons of using laser for produce the cells. The following paragraphs will list which process the laser technique have been used in this review. Introduction The buried contact solar cell was invented at University of New South Wales by Green et al. in 1983. These solar cells have a relatively high efficiency approximately 25% and present a possibility of cost-reduction with applying this technology to the manufacturers’ production lines. The following are the general main steps of forming the buried contact solar cell: 1. Texturing of surfaces 2. Top surface diffusion 3. Oxide growth 4. Groove cutting and diffusion 5. Aluminum deposition and sinter 6. Metal plating 7. Edge isolation The key parts of this process, which result in the cells become more efficiency than the standard screen printing solar cells are the laser grooving and groove diffusion to reduce the cell shading and contact resistance and the texturing which reduce the surface reflection. A schematic of a buried contact solar cell is shown in the figure below (Green 1995). [pic]Figure 1: Cross-section of buried contact solar cell Research continues working on the ways which could further improve the efficiency of the buried contact solar cell. With the statistics obtained from the experiment, they can try to figure out the effects which using different methods and materials in solar cells would cause. These parts include different diffusion profiles to form the p-n junction, surface passivation using different materials, and the different methods of grooving of the silicon, rear surface treatment, metallization and so on. Laser texturing In order to reduce the reflection effect of the solar cells, front surface texturing is one solution. There have many methods to increase the light trapping, such as mechanical scribing and reactive ion etching. However, laser texturing could effectively texture the multicrystalline surface, providing isotropic etching that other techniques cannot do. Abbott and Cotter (2006) revealed that with deeper laser texturing, the less the front surface reflection is. More detailed results are shown in figure 2 (adapted from Abbott and Cotter 2006). Note that with very shallow texturing (10mm), they cannot trapping very well, as a result behaving like the planar one. Figure 2: Front surface reflection of laser textured samples with different ablation pit depths (0) 10mm, (? 20mm, (? ) 30 mm, (*) 40 mm, (x) 50mm with residual slag, (+) planar silicon and (line) random pyramid textured silicon. It is straightforward that we should texturing deeper pit, however, this will increase the surface recombination rate, which is detrimental to solar cells. Even though the pit depths 50mm have the lowest reflection, it will leave some slag in the pits that acting like defects. These residual slags will enhance t he surface recombination rate, reducing the open-circuit voltage as well as the efficiency of the solar cells. Finding better parameters of operation to texture the wafer properly without the appearance of slag is therefore becomes the main issue for the manufacturers. Top Surface diffusion The conventional method for doping materials is the thermal diffusion which performed at high temperature (over 800? ). The process is so-called solid state diffusion and has various methods, for instance physical vapour deposition, to control the doping profiles. Also there is a considerable alternative method of forming doping areas in silicon solar cells by using laser-doping. With the Nd:YAG pulsed laser, the doping profiles can be controlled with the desirable doping area. Ogane et al. (2009) asserted that by using the laser doping technique with 0. 5W output, it can fabricate the solar cells with comparable efficiency to those fabricated by thermal diffusion methods. Some statistics of the result from their research are shown in figure 3 (adapted from Ogane et al. 2009). Note that a large number of the oxygen atoms are induced to the solar cells owing to the operation is in air. This increase the sheet resistance and as a result, reducing the efficiency of the solar cells. The advantages of the laser doping process are that it can be operated at room temperature, in the atmosphere, as well as the easier process forming a selective doping area without any lithography pre-set processes. With these advantages, even though the properties of these solar cells are slightly worse than the cells handled by thermal diffusion, it is acceptable to some manufacturers and worthy to work on it. [pic] Figure 3: The average of six solar cells properties of cells with emitters fabricated by laser doping as a function of laser output power, compared with the case of thermal diffusion (TD). Laser groove The most common device which is used to form the laser grooved front surface contacts is the Nd:YAG pulsed laser, operating at a high frequency. The depth of the laser groove after lasing is typically 30 microns deep and approximately 20 microns wide. During the process, laser will vaporises silicon through the oxidation layer, and this will induced the thermally damaged to silicon. Such this damage will acts as recombination sites of carriers when operating the solar cells, minimised this defect is therefore necessary in order to improve the efficiency of the solar cells. Studies on this part (Schoonderbeek et al. 2007) have revealed that using the shorter wavelength of the laser, i. e. the higher power output can reduce the thermal damage induce by the laser. [pic] Figure 4: Increased lifetime ratios (decreased laser damage) are obtained when scribing lines using short-wavelength lasers. Figure 4 (adapted from Schoonderbeek et al. 2007) above shows that by using lasers with short-wavelength at either 532nm (green) or 355nm (UV) will have better properties in comparison to 1064nm (IR) laser. Nevertheless, the lower cost of the IR laser is more favourable to the manufacturer. Thus the solar cell research of this part is undertaken at institutions and companies in order to find out the better trade-off point. Back surface field and laser-fired contacts The technology which usually used for rear contact passivation in solar cells is that highly doped region near the back contact. This is called back surface field. Normally aluminium is applied to it by evaporation, following by sintering to make aluminium atoms diffuse into the silicon. For reducing the cost per watts generated by solar cell, some different methods were tested for the feasibility analysis. One of the ways for reducing the cost is doping aluminium locally (Meemongkolkiat et al. 2006). It is obviously that doping less metal could reduce the cost, however the efficiency should not be diminish too much. In this process the oxide on the back surface is partially etched prior to aluminium were screen-printed on it. In their research, with choosing the aluminium screen-printing pastes properly (the composition is not provided in their paper), the efficiency of the solar cells are adequately (16%) compared to the normally full back surface field (16. %). Alternatively, aluminium deposition can be applied to the solar cell with the passivated emitter and rear contact, followed by fast scanning laser firing to reduce the rear surface recombination rate as well as improve light trapping. With this so-called laser-fired contact technique, Schneiderlochner et al. (2002, p. 32) demonstrated that the efficiency of the laser-fired contact solar cell can reach up to 21. 3%. Some result s from their research can be seen in figure 5, which are adapted from Schneiderlochner et al. 002. Note that the silicon nitride passivated layer has a lower efficiency maybe due to degradation in passivation quality during laser firing. [pic] Figure 5: The solar cell results with the laser-fired contact technique compared with conventionally processed passivated emitter and rear cells The main advantage of the laser-fired contact is that after possessed a passivating layer and depositing the aluminium, there is only one step needed (laser firing) instead of several processes of photolithography. Hence by using Nd:YAG pulsed laser system for laser-fired contact processing, the cost per watts can be reduced due to less handling steps, as well as the expensive chemicals. Summary There are some different techniques with respect to laser that applied to the fabrication of the solar cells are discussed above. With the laser system applied to the back surface field and laser-fired contacts, the cost can be reduced by using less costly chemicals, whereas shrinking the cost of instruments and operation for the case that laser system induced to the top surface diffusion. The aims of both grooving and texturing using laser technique are improving the properties of the solar cells. The laser system provides the possibilities of reducing the cost per watts without decreasing too many characteristics of the solar cells, which is the most important issue for manufacturers. Therefore, studies focus on these techniques will continue while some of them are already used in fabricating solar cells with other techniques. The ultimate aim of these is make the solar cells as cheap as possible so that public are willing to having it, thus minimizing the environment impact. Reference Abbott, M. and Cotter, J. 006, ‘Optical and electrical properties of laser texturing for high-efficiency solar cells’, Progress in Photovoltaics: Research and Applications, Volume 14, Issue 3, pp. 225-235. Honsberg, C. and Bowden, S. 2009, Buried Contact Solar Cells, Photovoltaics CDROM, accessed 12 September 2009, . Meemongkolkiat, V. ; Nakayashiki, K. ; Dong Seop, K. ; K im, S. ; Shaikh A. ; Kuebelbeck, A. ; Stockum, W. and Rohatgi, A. 2006, ‘Investigation of modified screen-printing Al pastes for local back surface field formation’, Photovoltaic Energy Conversion, Conference Record of the 2006 IEEE 4th World Conference on, Volume 2, pp. 1338-1341. Nd:YAG laser’, wiki article, 3 July 2009, accessed 14 September 2009, < http://en. wikipedia. org/wiki/Nd:YAG_laser>. Ogane, A. ; Hirata, K. ; Horiuchi, K. ; Nishihara, Y. ; Takahashi, Y. ; Kitiyanan, A. and Fuyuki, T. 2009, ‘Laser-doping technique using ultraviolet laser for shallow doping in crystalline silicon solar cell fabrication’, Japanese Journal of Applied Physics, Volume 48, Issue 7, pp. 071201. Schneiderlochner, E. ; Preu, R. ; Ludemann, R. and Glunz, S. W. 2002, ‘Laser-fired rear contacts for crystalline silicon solar cells’, Progress in Photovoltaics: Research and Applications, Volume 10, Issue 1, pp. 9-34. Schneiderlochner, E. ; Grohe, A. ; Glunz , S. W. ; Preu, R. & Willeke, W. 2003, ‘Scanning Nd:YAG laser system for industrially applicable processing in silicon solar cell manufacturing’, Photovoltaic Energy Conversion, 2003. Proceedings of 3rd World Conference on, Volume 2, pp 1364-1367. Schoonderbeek, A. ; Stute, U. ; Ostendorf, A. ; Grischke, R. ; Engelhart, P. ; Meyer, R. and Brendel, R. 2007, ‘Laser technology in silicon solar cell production’, Proceedings of the 4th International WLT-Conference on Lasers in Manufacturing, pp 693–698. [pic]

Essay Principles for a Catholic Morality - 681 Words

Theology –Christian Responsibility Principles For A Catholic Morality Timothy E. O’connell, the author of Principles For a Catholic Morality , attempts to speak plainly and directly about a topic which is, after all ,our own lives as we live them. As a personal synthesis, he tried to make the book blend the worlds of ordinary living and scholarly reflection. O’connell is the director of the institute of Pastoral studies at Loyola, Chicago. He is also the author of ‘ What a Modern Catholic Believes About Suffering and Evil’. The book ‘Principles For a Catholic Morality’ is not only addressed to students of Theology or to clergy, but also to anyone interested in understanding the living of the Christian life. OConnell explores the†¦show more content†¦Do they seem faithful to our experience of revelation? Do they speak in terms which resonate with our human experience? He insists that moral theology (which he has just expressly reduced to moral philosophy) Tests its own conclusions against the experience of mankind, and adds, That is what it means to say that our ethics is human .We use history to mine the past for useful and helpful insights. One of the goals this book tries to achieve is to understand the moral world; this book is about us. â€Å" As Christ was the â€Å"image of God† , so man in his earthly existence is to be the â€Å"image of the heavenly man.† It is growth in Christ that Paul recommends to his readers, contemporary and modern. In this way the Christian lives his life for God .† These are the words of Joseph Fitmyer. Seeking a Christian morality inevitably leads to meditation on the person of Jesus himself. Christ is the way, and truth to life. He is the revelation of God to human land. â€Å"Be human! No more and no less. Christ permits it, and Christ demands it† . (pg 35) Is one of the fundamental premises of the following principles of Christian ethics. The book itself was easy to read and had a good flow to it. Every chapter was connected some ways to the next. His facts were clear and he had creditable sources to refer to. The book was interesting to me and made some good points. If you wanted to check the facts you can always refer to the scriptures or parts of the bile O’connell refers to.Show MoreRelatedCatholic Moral Theology And The Medical Field935 Words   |  4 PagesCatholic Moral Theology and the Medical Field Principally, morality and ethical issues continue to be a topic of debate, particularly in the modern day world. Essentially, this is because some of them touch the heart of the human life and failure to find a convergence of opinion threatens existence (Piazza Landy, 2013). In this respect, religion is one tool that has significantly influenced and continues to shape this discourse. 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Analysis Of Rene Descartes s Work Discourse On The Method...

Throughout his work Discourse on the Method, Rene Descartes discusses the things he believes to be true concerning thought. He discusses the things which he believes to be more perfect and the things which he believes to be less perfect (pt 2, para 1). When comparing the two, he eventually comes to the conclusion that things that are more perfect are constructed by fewer hands and have specific purpose (pt 2, para 1). He also introduces in the opening portion of his work that his opinion of good sense is the ability to judge rightly and to follow through with the judgments (pt. 1, para 1). He concludes his writing by explaining that he believes that thinking is a non-mechanistic action, and he makes several points to confirm this (pt. 5, para 10). Descartes makes claims that sometimes compare thinking to the workings of a machine. However, he is correct in saying that thinking is a non-mechanistic action. 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(2) Noncommercial You may not use this work for commercial purposes (for example, by inserting passages into a book that is sold to students). (3) No Derivative Works You may not

The Atomic Energy Of Canada Limited - 1200 Words

Brief History (MICHAEL TABB) Merriam-Webster has defined reliability as: â€Å"the extent to which an experiment, test, or measuring procedure yields the same results on repeated trials†.[1] As technology advances, so does the use of computing and software in health services. With the onset of cancer, Atomic Energy of Canada Limited (AECL) created a medical linear accelerator known as the Therac-25. The machines responsibility is to accelerate and increase the energy of electrically charge atomic particles by the introduction of an electric field focused by magnets. These accelerators are used to treat cancer patients with radiation to remove malignant cancerous cells and tissue. The use of the machines caused radiation overdoses between 1985 and 1987 causing loss of life and limb for patients in six accidents.[2] These six accidents began 3 June 1985 with a sixty-one year old woman receiving her twelfth treatment at Kennestone Regional Oncology Center in Marietta, Georgia. 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Sodium Channels In Dental Pulp Health And Social Care Essay Free Essays

string(53) " order to supply the verve of dental mush \( 21 \) \." The dental mush is surrounded by the dental difficult tissue, which is a physical barrier against pathogen and hurt. The mush and dentin are frequently discussed together as one functional unit ; the pulpodentin composite. Pulp is capable to lucubrate dentin. We will write a custom essay sample on Sodium Channels In Dental Pulp Health And Social Care Essay or any similar topic only for you Order Now The permeable belongingss of dentin regulate the diffusion rate of thorns that can originate pulpal redness. Pulp contains vascularity and several nervus supplies. Blood vass in pulpal tissue are for alimentary supply and cellular enlisting, while nervousnesss in pulpal tissue are for dental sensitiveness and defence response following hurt either from dental cavities or injury. The dental mush has a low capacity for defence or fix responses because of the damage of an equal blood supply and cellular enlisting following dental hurt ( 1 ) . Several surveies have shown that the pulpal excitation plays an of import function in both defence and fix responses ( 2-4 ) . Therefore, in this reappraisal article, we focuses on the pulpal excitation in the response to pulpal hurt as mentioned below. 1.1 Normal excitation in lasting and primary tooth mush Pulpodentin composite in both lasting and primary dentitions is highly rich in excitations, as shown in the survey of Rodd and Boissonade ( 5 ) ( figure 1 ) , which influence the defence reactions in the connective tissue of the mush. These excitations consist of centripetal nervus fibres, sympathetic nervus fibres, and parasympathetic nervus fibres. The centripetal nervus fibres are the major excitation in the dental mush of both lasting and primary dentitions. They originate from trigeminal ganglion, in which centrally terminate in the spinal trigeminal karyon and peripheral base on balls through the apical hiatuss to innervate the coronal mush. At the peripheral portion into the coronal mush, they diverge, subdivision, and terminate as free nervus terminations in the odontoblast beds, subodontoblastic rete, predentin, in the interior 0.1 millimeter of dentin or along blood vass as shown in Byers ‘s survey ( 6 ) ( figure 2 ) . There are three subgroups of centripetal excitation in dental mush based on its size, its conductivity speed, and its map. First, A-? nervus fibres, the moderate-sized medullated fibres, are the smallest population of centripetal nervus fibres that are sensitive to mechanical stimulations such as hydrodynamic, percussion and motion force. Second, the little myelinated A-? nervus fibres can be seen m uch greater in dental mush. Finally, the largest part of centripetal nervus fibres is the unmyelinated, slow carry oning C fibres. Both A-? and C fibres are classified as the nociceptive which respond to noxious stimulations. The centripetal nervus fibres besides involve in dentinal fluid kineticss, vasoregulation and protective physiological reaction against dental hurts ( 7-9 ) . They provide verve of the dental mush by interacting with other pulpal cells, such as odontoblasts, immunocompetent cells, and blood vass. The old survey in rat theoretical accounts indicated that the centripetal nervus fibres in dental mush play an of import function in endurance of mush tissue. In that survey, they demonstrated that dentition with centripetal denervation had greater loss of mush tissue than those with excitation ( 4 ) . The sympathetic nervus fibres are sparse in dental mush of both lasting and primary dentitions. They are from superior cervical ganglion, located along the blood vass in deeper mush and involved in vasoconstriction. The other group of pulpal excitation in lasting and primary dentitions is parasympathetic nervus fibres, which play functions in ordinance of pulpal blood flow but are much less of import than the other two nervus fibres mentioned before. During the ripening and aging in lasting dentitions, dental mush becomes narrower with the deposition of third dentin and dead piece of lands, which are usually no excitation. With increasing loss of primary dentin, tooth excitation decreases as shown by the decrease in look of neuropeptides and their receptors in the dental mush ( 9, 10 ) . Several surveies demoing the distribution of nervus fibres in dental mush normally used protein cistron merchandise 9.5 ( PGP9.5 ) , a soluble protein isolated from encephalons, as a marker of nervus fibres. PGP9.5 staining appears to be dependable in responding with nervus fibres in several surveies with different techniques: immunohistochemistry ( 11 ) , immunoblotting ( 12 ) , immunocytochemistry ( 13-15 ) and immunofluorescence ( 5, 15, 16 ) . The centripetal excitations of primary dentitions differ in measure from those of lasting dentitions, in which the centripetal excitations of lasting dentitions are greater than primary dentitions ( 5, 13, 17 ) . Due to the outstanding map of centripetal nervus fibres in hurting transmittal, hence, several research workers hypothesized that the primary dentitions have less sensitiveness than the lasting dentition since the primary dentitions have less centripetal excitations. However, a old survey revealed different consequences in centripetal excitations between primary and lasting dentition ( 18 ) . In that survey, centripetal nervus supply in primary human dentition differs from lasting dentitions in two ways. First, the distribution of excitations within the Crown of primary dentitions were highest at cervical, while the lasting dentitions were dumbly supplied in the pulpal horn dentin. Second, the roots of primary dentin were peculiarly innervated at the cervical terminals of ro ots, but the roots of lasting dentin were virtually uninnervated. In add-on, physiologic root reabsorption does non impact histological construction and overall excitation of primary dentitions ( 19, 20 ) . Figure 1 shows the excitations in coronal mush of primary ( A ) and lasting ( B ) homo dentition. ( With permission of †¦ ) ( 5 ) Figure 2 shows the expiration o centripetal nervus fibres as free nervus terminations in the odontoblast beds ( OB ) , subodontoblastic rete ( rete of Raschkow: PI ) , predentin ( PD ) , in the interior 0.1 millimeter of dentin ( D ) or along blood vass. ( With permission of †¦ ) ( 1 ) 1.2 Sensory neuropeptides in dental mush The centripetal nervus fibres in dental mush are afferent fibres involved preponderantly in hurting perceptual experience. The terminuss of centripetal nervus fibres contain neuropeptides, synthesized neurotransmitter proteins from nerve cells. These peptidergic nerve cells are associated with neurogenic redness, caused by utmost stimulations such as dental cavities, boring, examining of the open dentin, or percussion of the dentition, in order to supply the verve of dental mush ( 21 ) . You read "Sodium Channels In Dental Pulp Health And Social Care Essay" in category "Essay examples" Dymanical alterations in peptidergic nerve cells occur during redness by extended germination. These germinations result in increased possible sites of neuropeptide incorporating fibres and accordingly released neuropeptides ( 3, 13, 14, 22-24 ) . Neuropeptides can non traverse cell membranes, so they trigger biological effects by triping their receptors located on the plasma membrane of the mark cells and they are quickly degraded by the enzymes in mush tissue after exercising the effects ( 25 ) . Functions of centripetal neuropeptides are multiple and variable. They could move as neurotransmitters, growing factors, endocrines, vasoregulators, immune system and signaling molecules. It is known that neuropeptides contribute to advance neurogenic redness, control of pulpal blood flow, and affect in hurting mechanisms of pulpodentin composite ( 26 ) . Several surveies demonstrated that neuropeptides can modulate vascular smooth musculus, addition in vascular permeableness, and besides modulate immunosystem ( 8, 26, 27 ) . The centripetal neuropeptides in lasting and primary tooth mush consist of calcitonin gene-related peptides ( CGRP ) , substance P ( SP ) and neurokinin A ( NKA ) ( 26, 28 ) . Summary of the beginning, localisation, stimulation and biological effects from centripetal neuropeptides in dental mush are summarized in table 1. 1.3 Nervous reactions to pulpal hurts When dental mush is injured, the altered conditions activate nervus fibres to bring on neurogenic redness, which is a procedure of stimuli-induced neuropeptides release, alteration in vascular permeableness and the enlisting of immunocompetent cells. The neurogenic redness can take to mending procedure ( 26, 29 ) . Several surveies have demonstrated the neurogenic redness happening in the dental mush following dental hurt. For illustration: the sensory ( 13, 30, 31 ) and sympathetic ( 2 ) nervus fibres shooting were found in inflamed dental mush. Byers and co-workers ( 32 ) demonstrated the variable grade of centripetal nervus fibres shooting correlated with assorted grade of hurt to dental mush of rat theoretical accounts. In that survey, mild hurt, e.g. shallow pits, caused an addition in CGRP-immunoreactive fibres, and those shooting CGRP-nerve fibres subsided within 21 yearss. The deeper pits were more injured to dental mush and leaded to microabscess with more legion subdivision s of centripetal nervus fibres shooting underneath. The shooting fibres had taken longer clip to lessen and the reparative dentin was substituted in those pulpal hurts microabscess. When the hurt theoretical accounts were the exposure of dental mush, several defensive reactions could be found, in such as mush polyps, curdling mortification and liquefying mortification. In those terrible pulpal hurts, the CGRP-immunoreactive fibres were found shooting following to the boundary line of defensive reactions and the axons were found to piece in the nucleus of lasting mush. As we have mentioned before, due to increased possible sites of neuropeptides release and the function of centripetal neuropeptides in hurting mechanism, the germination of centripetal nervus fibres following redness may change cytochemical reactions in the dental mush and contribute to the altered efficaciousness of local anaesthesia. 2. The look of Na channels in dental mush and their relation to dental inflammatory hurting The voltage-gated Na channels ( VGSCs ) are complex transmembrane pores that are responsible in depolarisation, peculiarly the raising stage of the action potency. They are found in excitable cells, such as nerve cells, myocytes ( 33 ) and some types of glia cells ( 34 ) . VGSCs unfastened within a msec in response to electrical alteration across the membrane to let Na ions influx and cause the increased neural membrane potency. Then, they terminate within unextended periods of clip to obstruct the Na ions flow and the nerve cells enter repolarization phase by the allowance of K ions influx at the neural membrane. After shutting, VGSCs return to resting province and are available to reopen in response to new moving ridge of electrical alteration. Therefore, VGSCs contribute to the finding of neural irritability and besides play the function in the extension of nervus urges. During hurts or redness, VGSCs in primary centripetal nerve cells are continuously activated and the uninterrup ted activation of VGSCs gives rise to motiveless self-generated action potency activity, that eventually cause uninterrupted hurting ( 35 ) . The Na channel is the selective filter composed of 1 big uninterrupted protein, ?-subunit and 1 or 2 smaller proteins, ?-subunits. The ?-subunits, a 220-260 kD polypeptide, contain a functional portion of ion channel including electromotive force detector, ion pore, activation, and inactivation gate. The ?-subunits modulate the maps of the ?-subunits and stabilise them to the plasma membrane. In mammals, 9 cistrons have been identified to encode VGSC ?-subunits into 9 isoforms depend on amino acid sequence homology and familial location. Each isoform differs in map such as tissue distribution, electrophysiological belongingss, pharmacological belongingss, and response to steel hurt and redness. Furthermore, each one is associated with the assortment of receptor molecules to modulate the irritability of nociceptors, so there are diversified procedures of nervus impulse extension depending on the nowadays of sodium channel ?-subunit isoform, for illustration, changing in opening thresh olds, opening clip length, sum of inactivation clip, or rate of isoform passage from closed inactivated province to the resting close province ( 36 ) . VGSCs can be functionally classified depending on the standards used, as shown in table 2, and the belongingss of each VGSC ?-subunit isoforms are summarized in table 3. In physiological status, the centripetal nerve cells in dorsal root ganglion ( DRG ) and trigeminal ganglion express both TTX-sensitive ( TTX-S ) and TTX-resistant ( TTX-R ) Na channels. The most population of centripetal nerve cells is mechanoreceptive with rapid-inactivating TTX-S Na channels. The little population is nociceptive, showing a mixture of rapid-inactivating TTX-S and slow-inactivating TTX-R Na channels. During the inflammatory procedure, inflammatory go-betweens lower the threshold of activation and increase the irritability of TTX-R in primary centripetal nerve cells, contribute to neural hyperexcitability ( 37 ) . Furthermore, there is the altered look of both TTX-S and TTX-R VGSCs in inflamed peripheral tissues ( 36, 38 ) . These alterations lead to increased hurting provinces. In dental mush, the quickly inactivating, TTX-S Na currents have been detected in civilized human alveolar consonant mush cells ( 39 ) . The writer suggested that the chief beginning of these Na currents were from neural orbiter cells, non odontogenic cells, because odontoblastic procedure of odontoblasts that steadfastly embedded themselves to the dentin and do non allowed these cells to be explanted. On the other manus, the in vitro survey of Allard and co-workers ( 40 ) found that odontoblasts expressed voltage-gated TTX-S currents which has capableness to bring forth action potency, but TTX-R Na currents has non been detected. Henry and co-worker ( 41 ) found no alteration in overall Na channels look in painful human alveolar consonant mush. But when concentrating on the feature of nodal sites, the measure of untypical nodal sites, including the Na channel look at these countries was found to be increased, while the typical nodal sites and Na channel accretion at these countries was found to be decreased. This survey showed that redness caused the demyelinating procedure and remodeling of the form of Na channel accretion. Many surveies supported the survey of Henry and co-worker. They revealed an addition in the look of NaV1.7 ( 16 ) , NaV1.8 ( 11, 12 ) and NaV1.9 ( 42 ) in dental mush with irreversible pulpitis comparison to dental mush of non-painful dentitions. NaV1.6 has besides been found in dental mush of both worlds and rats ( 43 ) , but its map in pulpal redness remains ill-defined. Not merely VGSCs isoforms, but besides epithelial Na channel, which is non-VGSC have been found in dental mush. The l ook of each Na channel isoform in dental mush is as described below. NaV1.6 is a TTX-sensitive VGSC isoform remarkably expresses at nodes of Ranvier, although assorted sodium channel isoforms are located within the PNS and CNS. Its map has been suggested to be an electrical conductivity in both myelinated and unmyelinated axons ( 44 ) . The look of NaV1.6 in human lasting tooth mush has been reported in the survey of Luo and co-workers ( 45 ) utilizing immunocytochemistry that there was no important difference in the look of NaV1.6 in normal and painful mush, despite an addition in the proportion of untypical nodes of Ranvier and an lessening in typical nodal sites in painful mush. The survey in rat theoretical accounts utilizing immunohistochemistry and dual immunofluorescence ( 43 ) has found that NaV1.6 expressed in pulpal immune cells, dendritic pulpal cells, and even in odontoblasts. This may propose the function of NaV1.6 in these cells. In contrast to the survey of Luo and co-workers ( 45 ) , mush tissue of injured rat dentitions in this survey showed the addition in NaV1.6 immunoreactive cells, preponderantly around the injured site and dilated blood vass. NaV1.7 is the TTX-sensitive VGSC isoform that was widely studied. It has been identified in the sympathetic nerve cells and little and average size centripetal nerve cells of DRG, which include nociceptive nerve cells. For the electrophysiological facet, NaV1.7 is quickly activated, quickly inactivated and easy recovered from fast activation, so it plays an of import function in puting the threshold for coevals of action potencies in peripheral nociceptive nerve cells ( 35 ) . NaV1.7 is markedly involved in comprehending hurting esthesis. As evidenced in the patients with loss-of-function mutant in SCN9A cistron, a cistron that encodes NaV1.7, those who have loss of NaV1.7 map are unable to see hurting ( 46, 47 ) . In add-on, patients with inborn hurting syndrome who have an change in NaV1.7 map have increased hurting sensitiveness associated with hydrops, inflammation and heat, proposing the function of NaV1.7 in chronic inflammatory hurting ( 48 ) . In dental mush of human lasting dentition, the upregulation of NaV1.7 look has besides been reported in painful pulpitis under immunohistochemical method ( 49 ) , every bit good as immunocytochemical method ( 16 ) , which has demonstrated the increased look of NaV1.7 isoform at typical and untypical nodal sites. The VGSC ?-subunit isoform 1.8 ( NaV1.8 ) and VGSC ?-subunit isoform 1.9 ( NaV1.9 ) , the slower TTX-R constituents, are unusually found in little unmyelinated centripetal nerve cells that have been identified as nociceptive nerve cells ( 36 ) . NaV1.8 has a high activation threshold, slow inactivation dynamicss and contribute to electrogenesis of action potency in C-type peripheral nerve cells of mice theoretical accounts ( 50 ) . NaV1.9 activates at potencies near resting membrane potency and generates comparatively relentless current ( 51 ) . Both TTX-R signifiers: NaV1.8, NaV1.9, are believed to be involved in the drawn-out continuance of action potency in response to painful stimulations and have been found to upregulate during inflammatory hurting ( 38, 52, 53 ) . Therefore, these sodium channel isoforms might be a new mark for intervention of inflammatory hurting. The different belongingss of NaV1.8 and NaV1.9 are as following. NaV1.8 currents have slow activation rate and fas t inactivation rate. The function of NaV1.8 in electrogenesis is to find action potency of nerve cells due to slower inactivation rates. The steady-state electromotive force dependance of inactivation contributes to bring forth action possible even at depolarisation province. NaV1.9 currents are alone and can be activated at electromotive force near the resting membrane potency and can bring forth relentless currents. Then, NaV1.9 can be easy activated, lend to puting of the threshold of activation, and can stay opening for longer clip than NaV1.8 ( 35, 36, 54 ) . Previous surveies utilizing antisense for NaV1.8 utilizing oligodeoxynucleotides ( 53, 55 ) and NaV1.8-null mice ( 56 ) have shown that NaV1.8 plays a function in inflammatory hurting and neuropathic hurting. NaV1.9 channels besides have a function in inflammatory hurting but non in neuropathic hurting ( 57, 58 ) . Localization of NaV1.8 in human dentitions with painful pulpitis has been investigated utilizing immunohistochemical method ( 11 ) . It has been found that NaV1.8-immunoreactive nervus fibres were localized in subodontoblastic bed of both healthy and inflamed mush tissue. However, the sensing of NaV1.8-immunoreactive fibres was much more seen in the inflamed dental mush. Furthermore, the upregulation of NaV1.8 has been reported utilizing the immmunoblotting method that has been used to quantify the protein degrees of NaV1.8 in inflamed human lasting tooth mush comparison to healthy mush ( 12 ) . The immunofluorescent survey has revealed that non merely the predominant NaV1.6, but besides NaV1.8 has presented at the nodes of Ranvier in the radicular portion of healthy human lasting tooth mush ( 59 ) . This determination has suggested the coexistence of multiple Na channel isoforms in these countries that may alter in the degrees of look during the inflammatory period and contribute to increased hurting position. For NaV1.9, the probe in rat theoretical accounts has revealed the excitations of NaV1.9-immunoreactive fibres in the lip tegument and dental mush of non-painful dentitions, proposing the function of this VGSC isoform in orofacial hurting ( 60 ) . Equally good as the other Na channel mentioned above, the immunocytochemical method has reported the increased look of NaV1.9 in the axons of diagnostic pulpitis of human lasting tooth ( 42 ) . Epithelial Na channel ( ENaC ) protein is a member of degenerins household ( DEG ) , which is a big protein household of diverse maps, such as Na ion conveyance, acerb esthesis, proprioception, and mechanosensation ( 61 ) . Differing from VGSCs which consist of ?- and ?- fractional monetary unit, ENaC consists of four fractional monetary units: ? , ? , ? and ? fractional monetary unit ( 62 ) . Merely ? , ? and ? fractional monetary units of ENaC has been indicated in mechanoreceptors in trigeminal ganglion of rat theoretical accounts with a possible map in mechanotransduction ( 63 ) . ENaC? has been identified in the terminal Schwann cells associated with the periodontic Ruffini terminations in the periodontic ligament of the rat incisors and believed to be a cardinal molecule for mechanosensation in chew ( 64 ) . There has besides been the ENaC in rat dental mush tissue, as being seen by immunohistochimistry ( 65 ) . In this survey, the ?ENaC and ?ENaC-immunoreactive fibres have app eared in trigeminal ganglion nerve cells, periodontic ligament, deep bed of unwritten mucous membrane, inferior alveolar nervus fibres, radicular mush and subodontoblastic rete of rat grinders mush tissue. The localisation of ?ENaC in dental mush was largely at myelinated nervus fibres which are sensitive to mechanical stimulations, while it was largely barren at unmyelinated nociceptive axons. There have been the efforts to detect new substances for Na channel blockers for the intervention of both neuropathic and inflammatory hurting. Lidocaine, normally used anaesthetics, is one of those with non-specific barricading belongings. Scholz and co-workers reported that TTX-R channels are more immune to lidocaine than TTX-S in rat theoretical accounts ( 66 ) . In contrast to Scholz survey, other surveies in rat theoretical accounts reported TTX-R channels are more sensitive to lidocaine than TTX-S Na channels ( 67, 68 ) . Until now, the specific VGSC isoforms that are the jobs in anaesthetic failure is still controverted. The usage of combination between for good charged Lidocaine ( N-ethyl-lidocaine ) and capsaicin, an agonist for the transient receptor possible vanilloid 1 ( TRPV1 ) , in rat theoretical accounts has been reported ( 69 ) . The writers claimed the advantage of this regimen over the usage of apparent local anaesthetic agents in non doing the shortage in motor an d autonomic nervus map, but it required further survey. Isoflurane, an inhalating anaesthetic agent, was besides proved to barricade TTX-s every bit good as NaV1.8 currents in rats ( 70 ) . Eugenol, the broad usage agent in dental clinic, had ability to suppress both TTX-R and TTX-S Na ion currents in rats and had the consequence on nociceptive, every bit good as non-nociceptive fibres ( 71, 72 ) . Hence, eugenol may be another good pick to be an analgetic and anaesthetic agents used in dental intervention. In add-on to those mentioned above, the Na channel barricading efficaciousness of assortment opioid derived functions has been studied. This survey found that tramadol, Fentanyl and sufentanil had sodium channel barricading ability particularly in slow-activation Na channel isoform, while morphia did non ( 73 ) . The specific Na channel blockers have been improved but they are limited to specific NaV1.8 blockers, such as ?O-conotoxin MrVIB from Conus Marmoreus ( 74 ) , a little m olecule antisense oligonucleotide ( A-803467 ) ( 75, 76 ) and 5-Aryl-2-furfuramides ( 77 ) . Unfortunately, despite many researches about Na channel blockers, none of Na channel barricading agents is considered to be effectual and safe plenty to utilize in homo. Further surveies for the new coevals of hurting intervention are still needed. In decision, dental hurting is a important wellness job. Although several voltage-gated Na channel isoforms, every bit good as an epithelial Na channel, have been identified in dental mush with different location and map, merely NaV1.7, NaV1.8 and NaV1.9 serve as a cardinal function in inflammatory mush. These sodium channel isoforms are suggested to be the possible marks for the fresh hurting intervention of pulpal redness and to seek for fresh anaesthetics in the intervention of painful pulpitis. How to cite Sodium Channels In Dental Pulp Health And Social Care Essay, Essay examples

Integrating Online and Offline Strategies

Question: Discuss about the Integrating Online and Offline Strategies. Answer: Measuring Marketing Metrics Measurement is the first step that leads to control and, eventually, to improvement (H. James Harrington) moreover metrics give an understanding on how content is making progress. The content should engage the market in style and its normally a measure of your ability or tone to give out information that is helpful and also relevant authoritative information hence in a spoken way. The best way to engage markets is by using stories that the audience can relate to and also able to provide context for the relevant information. The market position should improve and influence appropriately - its the measure of increasing impact of the market projects. The success or failure of internet programs can be determined by taking into considerations the effectiveness of metrics and one can identify with the importance and difficulty of choosing the most relevant metrics to reach marketing objectives(Roberts Zahay, 2013) The content should be in a position to support the firms short term and long term goals; emphasizing on time limit and particular projects may get in the way of fishing up the big projects. The process for selecting and producing content topic should be efficient as this eliminates stress, burn out and frustrations that may be caused to meeting strict deadlines; efficiency will produce the best content. Overall traffic on the website portrays that a site is unique. The number of people visiting the site visit depending on company size, industry or the amount of content produced. In an instance a page views are high than the visitors it most probably shows how the audience find the content engaging since the individuals click around multiple pages. Theres a need for developing new sets of parameters to evolve marketing channel since it will drive improvements and help out the businesses to focus on their people and resources on what is considered key and provide more focus on values of the accomplished and already achieved. References Excellence - the IBM way: H. James Harrington H. Harrington - ASQC Quality Press 1988 Internet marketing: integrating online and offline strategies Mary Roberts - Debra Zahay - South-Western Cengage Learning - 2013