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肉鸡加工过程中环境与产品质量控制

中国家禽 2011年第6期33卷 38-40页

作者： E.Abboah-Afari B.H.Kiepper H.S.Plumber B.H.Kiepper M.E.Berrang D.P.Smith R.j.Meinersmann t.j.clark j.Hughes B.Dean 美国乔治亚大学美国农业部美国北卡罗莱纳州立大学美国阿肯色州立大学

1采用膜过滤净化肉鸡加工废水本研究的目的旨在评价采用膜过滤对改善肉鸡加工废水水质的效果。将一定量商业肉鸡加工废水分别用1500~3000μm和508μm过滤网进行初级过滤,去除固体残渣。取4L经过初级处理的废水样品,用500/106μm过滤器... 详细信息

1采用膜过滤净化肉鸡加工废水本研究的目的旨在评价采用膜过滤对改善肉鸡加工废水水质的效果。将一定量商业肉鸡加工废水分别用1500~3000μm和508μm过滤网进行初级过滤,去除固体残渣。取4L经过初级处理的废水样品,用500/106μm过滤器进行预处理.

关键词：肉鸡加工克氏肉鸡屠宰弯曲杆菌试验鸡萘啶酸酮酸聚砜膜挥发性固体总悬浮固体量屠体胴体 COD 化学需氧量水质污染固体物聚偏二氟乙烯膜鼠伤寒沙门菌日龄

the Anomalous Mei-yu Rainfall of Summer 2020 from a Circulation Clustering Perspective:Current and Possible Future Prevalence

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Advances in Atmospheric Sciences 2021年第12期38卷 2010-2022,I0002-I0008页

作者： Robin t.clark Peili WU Lixia ZHANG Chaofan LI Met Office Hadley Centre FitzRoy RoadExeter EX13PBUK LASG Institute of Atmospheric Physics(IAP)Chinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Highly unusual amounts of rainfall were seen in the 2020 summer in many parts of China,japan,and South *** the intercontinental scale,case studies have attributed this exceptional event to a displacement of the climatological western North Pacific subtropical anticyclone,potentially associated Indian Ocean sea surface temperature patterns and a mid-latitude wave train emanating from the North *** clusters of spatial patterns of sea level pressure,we show that an unprecedented 80%of the 2020 summer days in East Asia were dominated by clusters of surface pressure greater than normal over the South China *** examining the rainfall and water vapor fluxes in other years when these clusters were also prevalent,we find that the frequency of these types of clusters was likely to have been largely responsible for the unusual rainfall of *** two ensembles of future climate projections,we show that summers like 2020 in East Asia may become more frequent and considerably wetter in a warmer world with an enhanced moisture supply.

关键词： circulation clustering mei-yu front 2020 summer rainfall climate projections

Null Controllability of Some Reaction-Diffusion Systems with Only One Control Force in Moving Domains

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Chinese Annals of Mathematics,Series B 2016年第1期37卷 29-52页

作者： j. LIMACO M. clark A. MARINHO S. B. de MENEZES A. t. LOUREDO Universidade Federal Fluminense IM RJ Brazil Universidade Federal do Piaui DM PI Brazil Universidade Federal do Piaui DM PI Brazil Universidade Federal do Ceara DM CE Brazil Universidade Estadual da Pavaiba DM PB Brazil.

In this article, the authors establish the local null controllability property for semilinear parabolic systems in a domain whose boundary moves in time by a single control force acting on a prescribed subdomain. the proof is based on Kakutani＇s fixed point theorem combined with observability estimates for the associated lineaxized system.

关键词： Kakutani's fixed point theorem Unique continuation Null controllability

Wing, tail, and vocal contributions to the complex acoustic signals of courting Calliope hummingbirds

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Current Zoology 2011年第2期57卷 187-196页

作者： Christopher james clark Peabody Museum of Natural History Yale University PO Box 208106 New Haven CT 06511 USA Museum of Vertebrate Zoology University of California- Berkeley Berkeley CA USA

Multi-component signals contain multiple signal parts expressed in the same physical modality. One way to identify individual components is if they are produced by different physical mechanisms. Here, I studied the mechanisms generating acoustic signals in the courtship displays of the Calliope hummingbird Stellula calliope. Display dives consisted of three synchronized sound elements, a high-frequency tone （hfl）, a low frequency tone （lft）, and atonal sound pulses （asp）, which were then followed by a frequency-modulated fall. Manipulating any of the rectrices （tail-feathers） of wild males impaired production of the lft and asp but not the hfl or fall, which are apparently vocal. I tested the sound production capabilities of the rectrices in a wind tunnel. Single rectrices could generate the lft but not the asp, whereas multiple rectrices tested together produced sounds sitlfilar to the asp when they fluttered and collided with their neighbors percussively, representing a previously unknown mechanism of sound production. During the shuttle display, a trill is generated by the wings during pulses in which the wingbeat frequency is elevated to 95 Hz, 40% higher than the typical hovering wingbeat frequency. the Calliope hummingbird courtship displays include sounds produced by three independent mechanisms, and thus include a minimum of three acoustic signal components. these acoustic mechanisms have different constraints and thus potentially contain different messages. Producing multiple acoustic signals via multiple mechanisms may be a way to escape the constraints present in any single mechanism .

关键词： Calliope Hummingbird Courtship Multicomponent Signal Sonation Wind tunnel

Increasing Flash Floods in a Drying Climate over Southwest China

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Advances in Atmospheric Sciences 2018年第8期35卷 198-203页

作者： Chan XIAO Peili WU Lixia ZHANG Robin t. clark National Climate Centre China Meteorological Administration Beijing 100081 China Met Office Hadley Centre FitzRoy Road Exeter EX1 3PB UK Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

In a globally warming world, subtropical regions are generally expected to become drier while the tropics and mid-high latitudes become wetter. In line with this, Southwest China, close to 25°N, is expected to become increasingly prone to drought if annual mean precipitation decreases. However, despite this trend, changes in the temporal distribution of moisture supply might actually result in increased extreme rainfall in the region, whose climate is characterized by distinct dry and wet seasons. Using hourly and daily gauge observations, rainfall intensity changes since 1971 are exalnined for a network of 142 locations in the region. From the analysis, dry season changes are negligible but wet season changes exhibit a significantly strong downward trend [-2.4% （10 yr）^-1], particularly during the past 15 years [-17.7% （10 yr）^-1]. However, the intensity of events during the wettest of 5% hours appears to steadily increase during the whole period [1.4% （10 yr）^-1], tying in with government statistical reports of recent droughts and flooding. If the opposing trends are a consequence of a warming climate, it is reasonable to expect the contradictory trend to continue with an enhanced risk of flash flooding in coming decades in the region concerned.

关键词： regional water cycle flash floods drought Southwest China

Surfactant protein A (SP-A) binds to phosphatidylserine and competes with annexin V binding on late apoptotic cells

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Protein & Cell 2010年第2期1卷 188-197页

作者： Anne jäkel Kenneth B.M.Reid Howard clark Department of Pharmacology University of OxfordMansfield RoadOxford OX13QTUK MRC Immunochemistry Unit Department of BiochemistryUniversity of OxfordSouth Parks RoadOxford OX13QUUK University of Southampton MP 803 Level FSouth BlockSouthampton General HospitalSouthampton SO166YDUK

the role of surfactant protein A(SP-A)in the recognition and clearance of apoptotic cells is well established,but to date,it is still not clear which surface molecules of apoptotic cells are involved in the *** we present evidence that phosphatidylserine(PS)is a relevant binding molecule for human *** binding is Ca^(2+)-dependent and is not inhibited by mannose,suggesting that the sugar-binding site of the carbohydrate recognition domain(CRD)of SP-A is not *** cytometry studies on apoptotic jurkat cells revealed apparent inhibition of annexin V binding by increasing concentrations of SP-A in late apoptotic but not early apoptotic cells,and this was consistent for jurkat cells and *** these data,confocal microscopy results show a co-localisation of annexin V and SP-A in late apoptotic but not early apoptotic ***,we cannot conclude that this inhibition is exclusively due to the binding of SP-A to PS on the cell surface,as annexin V is not wholly specific for PS and SP-A also interacts with other phospholipids that might become exposed on the apoptotic cell surface.

关键词： surfactant proteins phosphatidylserine apoptotic cells

Non-Local Density Functional Description of Poly-Para-Phenylene Vinylene

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Chinese Physics Letters 2007年第3期24卷 807-810页

作者：郑广 clark S. j Brand S. Abram R. A. School of Mathematics and Physics China University of Geosciences Wuhan 430074 Department of Physics University of Durham Durham DHI 3LE United Kingdom

A fully non-local exchange-correlation formalism the weighted density approximation （WDA）, has within the framework of density functional theory, known as been applied to the conjugated polymer poly-para-phenylene vinylene （PPV） and is shown to lead to a marked improvement in the agreement of theory and experiment for the electronic band structure of the conjugated polymer. In particular, some new model WDA functions are developed, which substantially increase the electronic band gap of the polymer relative to those obtained with the local density approximation and generalized gradient approximation. the calculated band gap of PPV is quantitatively or atleast semiquantitatively in agreement with the experimental data.

关键词： INHOMOGENEOUS ELECtRON-SYStEMS CONjUGAtED POLYMERS HARtREE-FOCK APPROXIMAtION EXCHANGE 1St-PRINCIPLES FORMALISM MOLECULES SEMICONDUCtORS DYNAMICS

BUILDINGS ALIVE!EStABLISHING tHE COSt OF LIVING BUILDINGS StRIVING FOR NEt ZERO PERFORMANCE

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journal of Green Building 2009年第3期4卷 61-71页

作者： Elizabeth j.Heider clark Brockman Skanska USA Building United States SERA Architects Inc United States

INtRODUCtION Innovative ideas have helped bring us some of the most incredible technological advances the world has *** ideas have ranged from the practical—“classic”inventions like the telephone—to the *** would have believed 15 years ago that today,in 2009,we are literally on the cusp of space *** incredible as the thinking was behind those innovations,there is another element that affects whether or not inventions catch on in a meaningful *** remarkable as many inventions are,we know that it takes more than innovation to bring big ideas into reality—it takes a deep understanding of what things cost,and of the value that objects or ideas will deliver over time.

关键词： telephone meaningful invention

Calculation and interpretation of classical turning surfaces in solids

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npj Computational Materials 2021年第1期7卷 229-238页

作者： Aaron D.Kaplan Stewart.j.clark Kieron Burke john P.Perdew Department of Physics Temple UniversityPhiladelphiaPA 19122USA Centre for Materials Physics Durham UniversityDurham DH13LEUK Departments of Chemistry and Physics University of CaliforniaIrvineCA 92697USA Departments of Physics and Chemistry Temple UniversityPhiladelphiaPA 19122USA

Classical turning surfaces of Kohn–Sham potentials separate classically allowed regions(CARs)from classically forbidden regions(CFRs).they are useful for understanding many chemical properties of molecules but need not exist in solids,where the density never decays to *** equilibrium geometries,we find that CFRs are absent in perfect metals,rare in covalent semiconductors at equilibrium,but common in ionic and molecular *** all materials,CFRs appear or grow as the internuclear distances are uniformly *** can also appear at a monovacancy in a *** with several approximate density functionals and codes confirm these behaviors.A classical picture of conduction suggests that CARs should be connected in metals,and disconnected in wide-gap insulators,and is confirmed in the limits of extreme compression and ***,many semiconductors have no CFR at equilibrium,a key finding for density functional ***,a strong correlation with insulating behavior can still be ***,equilibrium bond lengths for all cases can be estimated from the bond type and the sum of the classical turning radii of the free atoms or ions.

关键词： turning solids expanded