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Search Results: 1 - 10 of 9306 matches for " McAllister Alan Jack "
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Efeito das taxas de descarte sobre medidas econ?micas de vacas leiteiras em Kentucky
Ribeiro, Anamaria Candido;McAllister, Alan Jack;Queiroz, Sandra Aidar de;
Revista Brasileira de Zootecnia , 2003, DOI: 10.1590/S1516-35982003000700025
Abstract: the aims of this research were to evaluate the effect of culling reasons on lifetime economic measures of dairy cows especially, lifetime net income (lni), lifetime efficiency (le), income over feed costs (iofc) and lifetime income per day of productive life (lipl) using 19,565 lifetime records from holstein cows. culling rate was calculated dividing the number of culled animals, yearly, by the number of all animals present in each year. data on reasons for disposal were used to calculate the culling rate distribution, dividing the number of animals in each class of culling reason by the total number of animals. the estimated culling rate was 31.39%. this value was high and could be a result from the short productive life of cows, 25.57 months. the main reasons for disposal were reproductive problems (21.57%), injuries and other causes (21.17%), and low production (17.20%). involuntary culling was responsible for the majority of culling, representing 75% of total. all traits were significantly affected by culling reason. cows culled for dairy purposes were more profitable to producers.
Efeito das taxas de descarte sobre medidas econ micas de vacas leiteiras em Kentucky
Ribeiro Anamaria Candido,McAllister Alan Jack,Queiroz Sandra Aidar de
Revista Brasileira de Zootecnia , 2003,
Abstract: Foram utilizadas 19.565 lacta es vitalícias de vacas da ra a Holandesa para avaliar o impacto dos motivos de descarte sobre a rentabilidade vitalícia de vacas leiteiras, mais especificamente sobre a receita líquida vitalícia (RLV), eficiência vitalícia (EF), receita do leite menos o custo de alimenta o (RLMA) e receita líquida por dia de vida produtiva (RLD). A taxa geral de descarte foi igual a 31,39%, valor que pode ser considerado alto e estaria diretamente relacionado com a vida produtiva curta encontrada para estes rebanhos, 25,57 meses. A principal causa de descarte foi problema reprodutivo (21,57%), seguido por injúrias e outras causas (21,17%) e baixa produ o (17,20%). Os descartes involuntários foram a grande maioria, representando 75% do total. As diferentes medidas econ micas estudadas sofreram impacto significativo do motivo de descarte, em que as vacas removidas por venda para fins leiteiros foram as mais rentáveis ao produtor.
Profitability measures of dairy cows
Ribeiro, Anamaria Candido;McAllister, Alan Jackson;Queiroz, Sandra Aidar de;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000900012
Abstract: this study was aimed at defining profitability measures designed for prediction of breeding values (ebv) in dairy cows. performance and economic data recorded in herds enrolled in the dhia (dairy herd improvement association) program in kentucky, usa, were used to evaluate economic functions which included the following profitability measures: lifetime net income (lni), efficiency (ef), milk income over feed costs (iofc), net income per day of productive life (nipl), net income at the end of the first lactation (ni1), and milk income over feed costs at the end of the first lactation (iofc1). the estimated averages for lni, ef, iofc, nipl, ni1 and iofc1 were respectively us$ 532.13, 1.04, us$ 3038.19, us$ -0.16, us$ -69.34 and us$ 1293.77. the heritability estimates for these traits ranged from 0.06 to 0.09. the ebv and spearman correlation estimates were positive, ranging from moderate to high values, suggesting a direct linear relationship among the profitability measures. lni was the best profitability measure and genetic correlation estimates between lni and economic measures recorded in first lactation (ni1 and iofc1) were moderate (<0.56). ni1 was the most efficient profitability measure, but it would be easier to record data to calculate iofc1. overall, results do not suggest any economic function measured in the first lactation as a selection criteria for lni. the profitability measures were affected by the short productive life of the animals in the herds. selection based on different profitability measures would not result in similar ranking of sires.
A Programmable Architecture for Layered Multimedia Streams in IPv6 Networks
Brendan McAllister,Alan J. Marshall,Roger F. Woods
Journal of Networks , 2010, DOI: 10.4304/jnw.5.1.65-74
Abstract: A new configurable architecture is presented that offers multiple levels of video playback by accommodating variable levels of network utilization and bandwidth. By utilizing scalable MPEG-4 encoding at the network edge and using specific video delivery protocols, media streaming components are merged to fully optimize video playback for IPv6 networks, thus improving QoS. This is achieved by introducing “programmable network functionality” (PNF) which splits layered video transmission and distributes it evenly over available bandwidth, reducing packet loss and delay caused by out-of-profile DiffServ classes. An FPGA design is given which gives improved performance, e.g. link utilization, end-to-end delay, and that during congestion, improves on-time delivery of video frames by up to 80% when compared to current “static” DiffServ.
Experience Report: Developing the Servo Web Browser Engine using Rust
Brian Anderson,Lars Bergstrom,David Herman,Josh Matthews,Keegan McAllister,Manish Goregaokar,Jack Moffitt,Simon Sapin
Computer Science , 2015,
Abstract: All modern web browsers - Internet Explorer, Firefox, Chrome, Opera, and Safari - have a core rendering engine written in C++. This language choice was made because it affords the systems programmer complete control of the underlying hardware features and memory in use, and it provides a transparent compilation model. Servo is a project started at Mozilla Research to build a new web browser engine that preserves the capabilities of these other browser engines but also both takes advantage of the recent trends in parallel hardware and is more memory-safe. We use a new language, Rust, that provides us a similar level of control of the underlying system to C++ but which builds on many concepts familiar to the functional programming community, forming a novelty - a useful, safe systems programming language. In this paper, we show how a language with an affine type system, regions, and many syntactic features familiar to functional language programmers can be successfully used to build state-of-the-art systems software. We also outline several pitfalls encountered along the way and describe some potential areas for future research.
Tetra-tert-butyl 13,14-dioxapentacyclo[8.2.1.14,7.02,9.03,8]tetradeca-5,11-diene-5,6,11,12-tetracarboxylate
Alan J. Lough,Kelsey Jack,William Tam
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812039220
Abstract: The stereochemistry of the title compound, C32H44O10, at the cyclobutane ring is cis-anti-cis. The molecule lies across an inversion center. In the crystal, weak C—H...O hydrogen bonds connect molecules into chains along [100], forming R22(6) rings.
Tetramethyl 1,4-dimethyl-13,14-dioxapentacyclo[8.2.1.14,7.02,9.03,8]tetradeca-5,11-diene-5,6,11,12-tetracarboxylate
Alan J. Lough,Kelsey Jack,William Tam
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812039219
Abstract: In the title compound, C22H24O14, the relative stereochemistry at the cyclobutane ring is cis-anti-cis and the methyl groups in the bicyclic rings are syn to each other. The two carboxylate groups attached to the same —C=C— bond are disordered over two sets of sites in a 0.603 (2):0.397 (2) ratio. In the crystal, weak C—H...O hydrogen bonds connect molecules into C(12) chains along [001] incorporating R222(10) rings.
Hexamethyl 13,14-dioxapentacyclo[8.2.1.14,7.02,9.03,8]tetradeca-5,11-diene-1,4,5,6,11,12-hexacarboxylate
Alan J. Lough,Kelsey Jack,William Tam
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812039232
Abstract: In the title compound, C24H24O14, the stereochemistry at the cyclobutane ring is cis-anti-cis and the –COOMe groups in the bicyclic rings are syn to each other. The molecule lies on a twofold rotation axis. In the crystal, weak C—H...O hydrogen bonds connect molecules into chains along [001], forming R22(10) rings.
Critical collapse of collisionless matter - a numerical investigation
Gerhard Rein,Alan D. Rendall,Jack Schaeffer
Physics , 1998, DOI: 10.1103/PhysRevD.58.044007
Abstract: In recent years the threshold of black hole formation in spherically symmetric gravitational collapse has been studied for a variety of matter models. In this paper the corresponding issue is investigated for a matter model significantly different from those considered so far in this context. We study the transition from dispersion to black hole formation in the collapse of collisionless matter when the initial data is scaled. This is done by means of a numerical code similar to those commonly used in plasma physics. The result is that for the initial data for which the solutions were computed, most of the matter falls into the black hole whenever a black hole is formed. This results in a discontinuity in the mass of the black hole at the onset of black hole formation.
A regularity theorem for solutions of the spherically symmetric Vlasov-Einstein system
Gerhard Rein,Alan D. Rendall,Jack Schaeffer
Physics , 1993, DOI: 10.1007/BF02101839
Abstract: In a previous paper two of the authors (G. R. and A. D. R.) showed that there exist global, classical solutions of the spherically symmetric Vlasov-Einstein system for small initial data. The present paper continues this investigation and allows also large initial data. It is shown that if a solution of the spherically symmetric Vlasov-Einstein system develops a singularity at all then the first singularity has to appear at the center of symmetry. The result adds weight to the conjecture that cosmic censorship holds if one replaces dust as matter model for which naked singularities do form by a collisionless gas described by the Vlasov equation. The main tool is an estimate which shows that a solution is global if all the matter remains away from the center of symmetry.
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