The Experts below are selected from a list of 830202 Experts worldwide ranked by ideXlab platform
Karl Ulrich Kainer - One of the best experts on this subject based on the ideXlab platform.
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basics of metal matrix composites
2006Co-Authors: Karl Ulrich KainerAbstract:Metal composite materials have found application in many areas of daily life for quite some time. Often it is not realized that the application makes use of composite materials. These materials are produced in situ from the conventional production and processing of metals. Here, the Dalmatian sword with its meander structure, which results from welding two types of steel by repeated forging, can be mentioned. Materials like cast iron with graphite or steel with a high carbide content, as well as tungsten carbides, consisting of carbides and metallic binders, also belong to this group of composite materials. For many researchers the term metal matrix composites is often equated with the term light metal matrix composites (MMCs). Substantial progress in the Development of light metal matrix composites has been achieved in recent decades, so that they could be introduced into the most important applications. In traffic engineering, especially in the automotive industry, MMCs have been used commercially in fiber reinforced pistons and aluminum crank cases with strengthened cylinder surfaces as well as particle-strengthened brake disks. These innovative materials open up unlimited possibilities for modern material Science and Development; the characteristics of MMCs can be designed into the material, custom-made, dependent on the application. From this potential, metal matrix composites fulfill all the desired conceptions of the designer. This material group becomes interesting for use as constructional and functional materials, if the property profile of conventional materials either does not reach the increased standards of specific demands, or is the solution of the problem. However, the technology of MMCs is in competition with other modern material technologies, for example powder metallurgy. The advantages of the composite materials are only realized when there is a reasonable cost – performance relationship in the component production. The use of a composite material is obligatory if a special property profile can only be achieved by application of these materials. The possibility of combining various material systems (metal – ceramic – nonmetal) gives the opportunity for unlimited variation. The properties of these new 1
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Metal Matrix Composites: Custom-made Materials for Automotive and Aerospace Engineering - Basics of Metal Matrix Composites
Metal Matrix Composites, 2006Co-Authors: Karl Ulrich KainerAbstract:Metal composite materials have found application in many areas of daily life for quite some time. Often it is not realized that the application makes use of composite materials. These materials are produced in situ from the conventional production and processing of metals. Here, the Dalmatian sword with its meander structure, which results from welding two types of steel by repeated forging, can be mentioned. Materials like cast iron with graphite or steel with a high carbide content, as well as tungsten carbides, consisting of carbides and metallic binders, also belong to this group of composite materials. For many researchers the term metal matrix composites is often equated with the term light metal matrix composites (MMCs). Substantial progress in the Development of light metal matrix composites has been achieved in recent decades, so that they could be introduced into the most important applications. In traffic engineering, especially in the automotive industry, MMCs have been used commercially in fiber reinforced pistons and aluminum crank cases with strengthened cylinder surfaces as well as particle-strengthened brake disks. These innovative materials open up unlimited possibilities for modern material Science and Development; the characteristics of MMCs can be designed into the material, custom-made, dependent on the application. From this potential, metal matrix composites fulfill all the desired conceptions of the designer. This material group becomes interesting for use as constructional and functional materials, if the property profile of conventional materials either does not reach the increased standards of specific demands, or is the solution of the problem. However, the technology of MMCs is in competition with other modern material technologies, for example powder metallurgy. The advantages of the composite materials are only realized when there is a reasonable cost – performance relationship in the component production. The use of a composite material is obligatory if a special property profile can only be achieved by application of these materials. The possibility of combining various material systems (metal – ceramic – nonmetal) gives the opportunity for unlimited variation. The properties of these new 1
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Metal Matrix Composites - Basics of Metal Matrix Composites
Metal Matrix Composites, 2006Co-Authors: Karl Ulrich KainerAbstract:Metal composite materials have found application in many areas of daily life for quite some time. Often it is not realized that the application makes use of composite materials. These materials are produced in situ from the conventional production and processing of metals. Here, the Dalmatian sword with its meander structure, which results from welding two types of steel by repeated forging, can be mentioned. Materials like cast iron with graphite or steel with a high carbide content, as well as tungsten carbides, consisting of carbides and metallic binders, also belong to this group of composite materials. For many researchers the term metal matrix composites is often equated with the term light metal matrix composites (MMCs). Substantial progress in the Development of light metal matrix composites has been achieved in recent decades, so that they could be introduced into the most important applications. In traffic engineering, especially in the automotive industry, MMCs have been used commercially in fiber reinforced pistons and aluminum crank cases with strengthened cylinder surfaces as well as particle-strengthened brake disks. These innovative materials open up unlimited possibilities for modern material Science and Development; the characteristics of MMCs can be designed into the material, custom-made, dependent on the application. From this potential, metal matrix composites fulfill all the desired conceptions of the designer. This material group becomes interesting for use as constructional and functional materials, if the property profile of conventional materials either does not reach the increased standards of specific demands, or is the solution of the problem. However, the technology of MMCs is in competition with other modern material technologies, for example powder metallurgy. The advantages of the composite materials are only realized when there is a reasonable cost – performance relationship in the component production. The use of a composite material is obligatory if a special property profile can only be achieved by application of these materials. The possibility of combining various material systems (metal – ceramic – nonmetal) gives the opportunity for unlimited variation. The properties of these new 1
Ravi Kanbur - One of the best experts on this subject based on the ideXlab platform.
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economics social Science and Development
World Development, 2002Co-Authors: Ravi KanburAbstract:Abstract Development economics nowadays is mainstream economics applied to poor countries. An examination of the core principles of mainstream economics reveals tremendous strengths, but also tremendous weaknesses. Other disciplines, such as sociology, anthropology and political Science, have complementary strengths that suggest a role for them as equal partners in Development studies and policy. The argument for a partnership of disciplines is logical and strong. But cross-disciplinarity is not easy in practice. It is best achieved through concrete exercises which demonstrate exactly how “two disciplines are better than one” when analyzing specific policy issues in Development.
Gilberto Morgan - One of the best experts on this subject based on the ideXlab platform.
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issues and ethical considerations in pharmaco oncogenomics
Advances in Experimental Medicine and Biology, 2019Co-Authors: Gilberto MorganAbstract:The rapid advancements of treatment modalities and vast amounts of information being generated through novel technologies, paint the picture of a very promising future, one that will allow for a more efficient and precise DNA sequencing and potentially more tailored cancer therapies for patients. However, with all these advances we must address the ethical and legal considerations each one of these technologies will raise. This is a necessity in order for advancement, not to stand in the way of Science and Development, but as a safeguard in protecting humanity and our personal genetic information.
Roy Williams - One of the best experts on this subject based on the ideXlab platform.
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Broken houses: Science and Development in the African Savannahs
Agriculture and Human Values, 1995Co-Authors: Brian Williams, Catherine Campbell, Roy WilliamsAbstract:In many developing countries people and livestock suffer from preventable or curable diseases, and their agriculture is vulnerable to natural disasters. A considerable amount of technical aid is directed at alleviating these problems using modern Science and technology, and yet most of these efforts either fail or even leave peasants and pastoralists worse off than before. In this paper we consider some of the problems that arise in relation to Development projects, focusing our attention on the savannah regions of Africa and, in particular, on the control of tsetse flies, which are the vectors of the African trypanosomiases, called nagana in cattle and sleeping sickness in people. We present a detailed case study of a project designed to enable a Maasai community in Kenya to carry out their own tsetse fly control. We examine the complex set of relationships and power structures that mediate the actions of the players in Development: scientists, local communities, governmental and nongovernmental institutions, and Development agencies. The purpose of this paper is not to present solutions to complex and difficult problems but rather to raise questions that should provide a framework for a debate concerning the role of Science and technology in the Development process.
Yves-alexandre De Montjoye - One of the best experts on this subject based on the ideXlab platform.
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Improving official statistics in emerging markets using machine learning and mobile phone data
EPJ Data Sci., 2017Co-Authors: Eaman Jahani, Alex ' Sandy 'pentland, Johannes Bjelland, Linus Bengtsson, Pål Sundsøy, Yves-alexandre De MontjoyeAbstract:Mobile phones are one of the fastest growing technologies in the developing world with global penetration rates reaching 90%. Mobile phone data, also called CDR, are generated everytime phones are used and recorded by carriers at scale. CDR have generated groundbreaking insights in public health, official statistics, and logistics. However, the fact that most phones in developing countries are prepaid means that the data lacks key information about the user, including gender and other demographic variables. This precludes numerous uses of this data in social Science and Development economic research. It furthermore severely prevents the Development of humanitarian applications such as the use of mobile phone data to target aid towards the most vulnerable groups during crisis. We developed a framework to extract more than 1400 features from standard mobile phone data and used them to predict useful individual characteristics and group estimates. We here present a systematic cross-country study of the applicability of machine learning for dataset augmentation at low cost. We validate our framework by showing how it can be used to reliably predict gender and other information for more than half a million people in two countries. We show how standard machine learning algorithms trained on only 10,000 users are sufficient to predict individual's gender with an accuracy ranging from 74.3 to 88.4% in a developed country and from 74.5 to 79.7% in a developing country using only metadata. This is significantly higher than previous approaches and, once calibrated, gives highly accurate estimates of gender balance in groups. Performance suffers only marginally if we reduce the training size to 5,000, but significantly decreases in a smaller training set. We finally show that our indicators capture a large range of behavioral traits using factor analysis and that the framework can be used to predict other indicators of vulnerability such as age or socio-economic status. Mobile phone data has a great potential for good and our framework allows this data to be augmented with vulnerability and other information at a fraction of the cost.