131,441 research outputs found
Possible high-temperature superconducting state with a d plus id pairing symmetry in doped graphene
No full textMotivated by a suggestion in our earlier work [G. Baskaran, Phys. Rev. B 65, 212505 (2002)], we study electron correlation driven superconductivity in doped graphene where on-site correlations are believed to be of intermediate strength. Using an extensive variational Monte Carlo study of the repulsive Hubbard model and a correlated ground state wave function, we show that doped graphene supports a superconducting ground state with a d+id pairing symmetry. We estimate superconductivity reaching room temperatures at an optimal doping of about 15%-20%. Our work suggests that correlations can stabilize superconductivity even in systems with intermediate coupling
Possible high-temperature superconducting state with a d+id pairing symmetry in doped graphene
No full textMotivated by a suggestion in our earlier work [G. Baskaran, Phys. Rev. B 65, 212505 (2002)], we study electron correlation driven superconductivity in doped graphene where on-site correlations are believed to be of intermediate strength. Using an extensive variational Monte Carlo study of the repulsive Hubbard model and a correlated ground state wave function, we show that doped graphene supports a superconducting ground state with a d+id pairing symmetry. We estimate superconductivity reaching room temperatures at an optimal doping of about 15%–20%. Our work suggests that correlations can stabilize superconductivity even in systems with intermediate coupling
Introduction:The Problem of Integrating ICT within National Systems of Innovation: Concepts, Taxonomies and Strategies
No full text"Running across the informative chapters on the diverse experience of several important countries with ICT is a unifying theory of what it takes for succesful economic development in today's globalized economy. While drawing on the high-tech products offered by advanced industrial nations, and selectively taking in foreign investments, developing nations need to build their own capabilities for innovation. This is a difficult balancing act, and one that requires significant indigenous investments in human capital and in R and D, and sophistication and strenght on the part of the relevant government officials. The case studies show different countries wrestling with the problem, some doing better and some worse. This is a fascinating and important book."Richard R. Nelson, George Blumenthal, Professor Emeritus of International and Public Affairs, Business, and Law, Columbia University, New York, USA."Running across the informative chapters on the diverse experience of several important countries with ICT is a unifying theory of what it takes for succesful economic development in today's globalized economy. While drawing on the high-tech products offered by advanced industrial nations, and selectively taking in foreign investments, developing nations need to build their own capabilities for innovation. This is a difficult balancing act, and one that requires significant indigenous investments in human capital and in R and D, and sophistication and strenght on the part of the relevant government officials. The case studies show different countries wrestling with the problem, some doing better and some worse. This is a fascinating and important book."Richard R. Nelson, George Blumenthal, Professor Emeritus of International and Public Affairs, Business, and Law, Columbia University, New York, USA.</p
Innovation System for ICT:The Case of India
No full text"Running across the informative chapters on the diverse experience of several important countries with ICT is a unifying theory of what it takes for succesful economic development in today's globalized economy. While drawing on the high-tech products offered by advanced industrial nations, and selectively taking in foreign investments, developing nations need to build their own capabilities for innovation. This is a difficult balancing act, and one that requires significant indigenous investments in human capital and in R and D, and sophistication and strenght on the part of the relevant government officials. The case studies show different countries wrestling with the problem, some doing better and some worse. This is a fascinating and important book."Richard R. Nelson, George Blumenthal, Professor Emeritus of International and Public Affairs, Business, and Law, Columbia University, New York, USA."Running across the informative chapters on the diverse experience of several important countries with ICT is a unifying theory of what it takes for succesful economic development in today's globalized economy. While drawing on the high-tech products offered by advanced industrial nations, and selectively taking in foreign investments, developing nations need to build their own capabilities for innovation. This is a difficult balancing act, and one that requires significant indigenous investments in human capital and in R and D, and sophistication and strenght on the part of the relevant government officials. The case studies show different countries wrestling with the problem, some doing better and some worse. This is a fascinating and important book."Richard R. Nelson, George Blumenthal, Professor Emeritus of International and Public Affairs, Business, and Law, Columbia University, New York, USA.</p
Greening flaring process in oil and gas industries / Yuharajan Baskaran
No full textThe process of burning excess natural gas in the atmosphere is known as gas flaring in the oil and gas industry. It occurs at the onshore and offshore oil and gas production platforms, as well as the processing plant. As a result, a significant proportion of natural gas is squandered. It would be ideal to recover energy from flared natural gas and use it to generate electricity, particularly in an offshore area when electricity is scarce. As a result, more attention should be paid to the efficient use of flared natural gas in offshore oil and gas installations. The energy recovery system, as one of the promising approaches for generating power from flared natural gas in the Central Processing Platform 1, has gotten a lot of attention (CPP1).
Through greenhouse gases and other pollutants, gas flaring is one of the most serious environmental issues. These emissions contribute to climate change by having a high global warming potential. Flared gas and its emissions must be measured, and this has proven to be a difficult task. The reduction and recovery of flare gases is a high priority since it satisfies both environmental and economic efficiency goals. In industry, there are several different forms of FGRS, including gas collection and compression, gas-to-liquid, and power generation. A variety of technical problems have hampered FGRS, including a combination of extremely variable flow rates and composition, poor heating value, and low pressure of waste gases. FGRS has enhanced noise and thermal radiation reduction, operating and maintenance expenses, air pollution and gas emission reduction, and reduced fuel gas and steam usage due to environmental and economic concerns.
Therefore, in this study, a simulation model was created using the HYSYS simulation software to anticipate the potential energy in terms of power generated from gas flaring in DCPP using a microturbine. The focus has been on recovering and evaluating potential energy from gas flaring, with the case study taking place at the Central Processing
Platform 1, the total amount of gas burned at CPP1 is currently 1.48MMscf/d. With the help of the simulation model, a total of 245kW of power may be created. Based on the amount of energy generated and the money required to set up the system, a complete economic analysis was conducted. It is found that the energy recovery system is extremely desirable, with a potential annual savings of RM217,344 during a 7-year payback time. To make use of the gas flaring, it is recommended that an energy recovery system consisting of a microturbine be placed in the Central Processing Platform 1
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Application of Lab Procedures for the Dynamic Evaluation of Roofing Systems. Part 1: Review of Existing Standards
No full textWind induced effects on roofing systems are dynamic because of the wind's variations with respect totime and space. Experiments were conducted at NRC/IRC on roofing materials . The data reported in"Evaluation of Roof Fasteners Under Dynamic Wind Loading - Baskaran and Dutt (1995)'; clearlyindicated that the fastener failure load and mode differ significantly under dynamic testing as compared tostatic testing. To develop a lab evaluation protocol for the roofing system, existing test procedures weresystematically reviewed. The review includes: the standard lab test methods currently being practiced inNorth America, such as the Factory Mutual (FM 4470) and Underwriters Lab (UL 580) procedures as wellseveral international test procedures used by the roofing community. It has been concluded that theexisting North American test methods are insufficient for evaluating roofing systems since they do notconsider the effects of dynamic wind loading. In Europe, fatigue has been acknowledged as an importantfactor in the evaluation of mechanically attached roofing systems. Thus the European test methods aremore realistic than those adopted in North America.Les effets induits par le vent sur les syst\ue8mes de couverture sont dynamiques en raison des variations du vent par rapport au temps et \ue0 l?espace. Des exp\ue9riences ont \ue9t\ue9 r\ue9alis\ue9es au CNRC/IRC sur des mat\ue9riaux de toiture. Les donn\ue9es signal\ue9es dans Evaluation of Roof Fasteners Under Dynamic Wind Loading, Baskaran et Dutt (1995) ont indiqu\ue9 clairement que la charge extr\ueame et le mode de d\ue9faillance des attaches diff\ue9raient consid\ue9rablement en conditions d?essai dynamique par rapport \ue0 l?essai statique. Afin de mettre au point un protocole d?\ue9valuation en laboratoire pour le syst\ue8me de couverture, on a examin\ue9 syst\ue9matiquement les proc\ue9dures d?essai existantes. Cet examen couvre: les m\ue9thodes d?essai en laboratoire normalis\ue9es qui sont appliqu\ue9es \ue0 l?heure actuelle en Am\ue9rique du Nord, comme celles de la Factory Mutual (FM 4470) et de Underwriter?s Laboratory (UL 580), ainsi que plusieurs proc\ue9dures d?essai internationales qui sont appliqu\ue9es par l?industrie des toitures. On en a conclu que les m\ue9thodes d?essai nord-am\ue9ricaines existantes sont insuffisantes pour l?\ue9valuation des syst\ue8mes de couverture, \ue9tant donn\ue9 qu?elles ne prennent pas en compte les incidences de la surcharge dynamique due au vent. En Europe, on reconna\ueet que la fatigue des mat\ue9riaux est un facteur important dans l?\ue9valuation des syst\ue8mes de couverture fix\ue9s m\ue9caniquement. Ainsi, les m\ue9thodes d?essai europ\ue9ennes seraient plus concr\ue8tes que celles adopt\ue9es en Am\ue9rique du Nord.Peer reviewed: NoNRC publication: Ye
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