Institution
Utrecht University
Education•Utrecht, Utrecht, Netherlands•
About: Utrecht University is a education organization based out in Utrecht, Utrecht, Netherlands. It is known for research contribution in the topics: Population & Context (language use). The organization has 58176 authors who have published 139351 publications receiving 6214282 citations. The organization is also known as: UU & Universiteit Utrecht.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the effects of progestin, androgens, and estrogens on global testicular gene expression patterns (microarray analysis), and molecular mechanisms by which steroids regulate specific candidate genes (identified by subtractive hybridization approaches) during early stages of testis maturation are discussed.
977 citations
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TL;DR: In this article, the authors investigated the performance of conditional model specification for multivariate imputation in incomplete multivariate data by means of simulation and showed that the results were produced using only five Gibbs iterations starting from a simple draw from observed marginal distributions.
Abstract: The use of the Gibbs sampler with fully conditionally specified models, where the distribution of each variable given the other variables is the starting point, has become a popular method to create imputations in incomplete multivariate data. The theoretical weakness of this approach is that the specified conditional densities can be incompatible, and therefore the stationary distribution to which the Gibbs sampler attempts to converge may not exist. This study investigates practical consequences of this problem by means of simulation. Missing data are created under four different missing data mechanisms. Attention is given to the statistical behavior under compatible and incompatible models. The results indicate that multiple imputation produces essentially unbiased estimates with appropriate coverage in the simple cases investigated, even for the incompatible models. Of particular interest is that these results were produced using only five Gibbs iterations starting from a simple draw from observed marginal distributions. It thus appears that, despite the theoretical weaknesses, the actual performance of conditional model specification for multivariate imputation can be quite good, and therefore deserves further study. © 2006 Taylor & Francis.
977 citations
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TL;DR: Berthe et al. as mentioned in this paper proposed two types of foliations in mylonites and mylonitic rocks: (a) S-surfaces related to the accumulation of finite strain and (b) C-surface related to displacement discontinuities or zones of relatively high shear strain.
976 citations
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University of Aberdeen1, University of California, Irvine2, Technical University of Berlin3, Hertie School of Governance4, Potsdam Institute for Climate Impact Research5, Stanford University6, University of New England (United States)7, Utrecht University8, Netherlands Environmental Assessment Agency9, ETH Zurich10, International Institute for Applied Systems Analysis11, Centre national de la recherche scientifique12, University of Oslo13, Met Office14, University of Exeter15, University of East Anglia16, University of São Paulo17, University of Maryland, College Park18, Carnegie Mellon University19, National Institute for Environmental Studies20, Pacific Northwest National Laboratory21, Korea University22
TL;DR: In this article, the authors quantify potential global impacts of different negative emissions technologies on various factors (such as land, greenhouse gas emissions, water, albedo, nutrients and energy) to determine the biophysical limits to, and economic costs of, their widespread application.
Abstract: To have a >50% chance of limiting warming below 2 °C, most recent scenarios from integrated assessment models (IAMs) require large-scale deployment of negative emissions technologies (NETs). These are technologies that result in the net removal of greenhouse gases from the atmosphere. We quantify potential global impacts of the different NETs on various factors (such as land, greenhouse gas emissions, water, albedo, nutrients and energy) to determine the biophysical limits to, and economic costs of, their widespread application. Resource implications vary between technologies and need to be satisfactorily addressed if NETs are to have a significant role in achieving climate goals.
974 citations
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TL;DR: A class of iron catalysts on relatively passive supports that robustly directed the FT process toward light olefins are demonstrated, using catalysts that constitute iron nanoparticles (promoted by sulfur plus sodium) homogeneously dispersed on weakly interactive α-alumina or carbon nanofiber supports.
Abstract: Lower olefins are key building blocks for the manufacture of plastics, cosmetics, and drugs. Traditionally, olefins with two to four carbons are produced by steam cracking of crude oil-derived naphtha, but there is a pressing need for alternative feedstocks and processes in view of supply limitations and of environmental issues. Although the Fischer-Tropsch synthesis has long offered a means to convert coal, biomass, and natural gas into hydrocarbon derivatives through the intermediacy of synthesis gas (a mixture of molecular hydrogen and carbon monoxide), selectivity toward lower olefins tends to be low. We report on the conversion of synthesis gas to C(2) through C(4) olefins with selectivity up to 60 weight percent, using catalysts that constitute iron nanoparticles (promoted by sulfur plus sodium) homogeneously dispersed on weakly interactive α-alumina or carbon nanofiber supports.
971 citations
Authors
Showing all 58756 results
Name | H-index | Papers | Citations |
---|---|---|---|
Ronald C. Kessler | 274 | 1332 | 328983 |
Albert Hofman | 267 | 2530 | 321405 |
Douglas G. Altman | 253 | 1001 | 680344 |
Hans Clevers | 199 | 793 | 169673 |
Craig B. Thompson | 195 | 557 | 173172 |
Patrick W. Serruys | 186 | 2427 | 173210 |
Ruedi Aebersold | 182 | 879 | 141881 |
Dennis S. Charney | 179 | 802 | 122408 |
Kenneth S. Kendler | 177 | 1327 | 142251 |
Jean Louis Vincent | 161 | 1667 | 163721 |
Vilmundur Gudnason | 159 | 837 | 123802 |
Monique M.B. Breteler | 159 | 546 | 93762 |
Lex M. Bouter | 158 | 767 | 103034 |
Elio Riboli | 158 | 1136 | 110499 |
Roy F. Baumeister | 157 | 650 | 132987 |