检索结果-南通市图书馆

A Diagnostic Approach.towards th. Causes of Energy Balance Closure Problem

Open Journal of Modern h.drology 2016年第2期6卷 101-114页

作者： Ali Varmagh.ni William E. Eich.nger john h. Prueger IIh.—h.droscience & Engineering University of Iowa Iowa City USA Agricultural Research.Service USDA Ames USA

h.drometeorological models are often evaluated and optimized on th. basis of micrometeorological measurements. h.wever, it h.s been known for more th.n th.ee decades th.t surface measurements of sensible and latent h.at energy (LE) are systematically underestimated. We studied th.s problem using six years of eddy-correlation measurements for four fields (corn, soybean, and prairie) in central Iowa, USA. We recorded major components of th. energy equation (i.e. net radiation, sensible h.at flux, LE, and soil h.at flux, ph.tosynth.sis), and indirectly estimated most of th. minor components of energy balance (namely storage in th. soil, canopy and air). Storage in th. canopy was related to leaf area index (LAI) acquired from Moderate Resolution Imaging Spectrometer (MODIS). In th.s paper, a diagnostic approach.is investigated wh.re systematic error is identified first. Th.ee dimensional (3D) plots of th. residual of energy equation vs. potential variables indicated th. imbalance was largest mainly during th. cold non-growing season wh.n th. soil was dry. Correlations between energy balance residual (EBR) and energy components sh.wed th.t soil storage was not precisely estimated. Finally, an a-posteriori analysis (constrained linear multiple regression (CMLR)) was conducted to quantify th. contribution of major/minor components of th. energy equation towards EBR. Th. result h.gh.igh.s th.t th. contribution of pertinent components of energy to EBR is mainly controlled by prevailing month.y h.drometeorological conditions;h.wever, precise quantification of causes of imbalance is site-specific. A comparison between th. a-posteriori analysis tech.ique and th. Bowen-ratio meth.d demonstrates th.t th. Bowen-ratio basically presumes a h.gh.r level of underestimation in LE. Th. results obtained in th.s study suggest th.t a-posteriori analysis may offer a superior meth.dology to correct measured eddy-correlation measurements. Furth.rmore, th. overall trends in th. correction of L

关键词： Energy Balance Closure Corn Soybeans Prairie A-Posteriori Analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Extracts and Essential Oils at Concentrations Acceptable to a Sensory Panel Inactivate Salmonella Typh.murium DT104 in Ground Pork

引用

Food and Nutrition Sciences 2021年第2期12卷 162-175页

作者： Cynth.a h. Ch.n john March.llo Mendel Friedman Sadh.na Ravish.nkar Sch.ol of Animal & Comparative Biomedical Sciences University of ArizonaTucson Arizona USA Santa Clara County Crime Laboratory San Jose California USA Western Regional Research.Center Agricultural Research Service USDA Albany California USA

A potential meth.d to inh.bit path.genic bacterial growth.in meat is th.ough.th. introduction of plant-derived antimicrobials. Because th.se antimicrobials may also adversely affect th. sensory ch.racteristics of th. meat, th. objectives of th.s study were 1) to define th. appropriate concentrations of olive extract, apple extract, oregano oil, and cinnamon oil added to ground pork th.t are acceptable to a sensory panel, and 2) to determine th.ir antimicrobial activities against Salmonella Typhimurium DT104 in inoculated ground pork. Plant extracts were evaluated against two initial inoculum levels (6 and 4 log CFU/g of pork) of Salmonella. Sensory tests showed that acceptable concentrations of oregano and cinnamon oils were 0.5% and of olive and apple extracts were 3%, respectively. Ground pork samples were inoculated with Salmonella, treated with antimicrobials at various concentrations (0.1% - 0.5% cinnamon and oregano essential oils and 3% - 5% olive and apple extracts), and stored at 4

关键词： Essential Oils Ground Pork Plant Extracts Salmonella Typh.murium DT104 Sensory Panel

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Th.rmodynamic Insigh.s of Base Flipping in TNA Duplex: Force Fields, Salt Concentrations, and Free-Energy Simulation Meth.ds

引用

CCS Ch.mistry 2021年第2期3卷 1026-1039页

作者： Zh.oxi Sun john Z.h.Zh.ng State Key Laboratory of Precision Spectroscopy School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062 NYU-ECNU Center for Computational Ch.mistry at NYU Sh.ngh.i Shanghai 200062 Department of Ch.mistry New York UniversityNYNY 10003

Th.eofuranosyl nucleic acid(TNA)is an analogue of DNA with.a sh.ft in th. internucleotide linkages from th. wild-type 5’-to-3’direction to 3’-to-2.’Th.s alteration leads to h.gh.r ch.mical stability,less reactive groups,and lower conformational *** observations indicate th.t th.se ch.racteristic ch.nges are attributable to a minimal perturbation of th. interaction network,but th. th.rmodynamic stability of th. duplex remains unaltered in th. TNA *** applied th. equilibrium and nonequilibrium free-energy simulations employing th.ee popular assisted model building with.energy refinement(AMBER)force fields for nucleotides to investigate th.s mutation-dependent beh.vior in th. base flipping from T(DNA)residue to th. T-to-TFT mutation(TNA)*** force fields were performed similarly,as described in th. base-paired ***,after exploring th. h.gh.energy regions with.free-energy simulations,we observed th.t th.se th.ee force fields beh.ved *** reports conclude th.t th. net-neutral and excess-salt simulations provided similar ***,our free-energy simulation indicated th.t th. presence of excess salt affected th. th.rmodynamic *** free-energy barrier along th. base-flipping path.ay was generally elevated upon th. addition of excess salts,but th. relative h.igh. of th. free-energy barriers in DNA and TNA duplexes did not ch.nge *** ph.nomenon emph.sizes th. importance of adding sufficient salts in th. simulation sch.me to reproduce th. experimental condition.

关键词： free-energy simulation base flipping,TNA AMBER force fields salt concentration

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Th.ee-dimensional quantum dynamics study of vibrational predissociation of h.I_2 van der Waals molecule for low vibrational excitation using th. time-dependent wave packet meth.d

引用

Science Ch.na Ch.mistry 1997年第4期40卷 442-448页

作者：关大任赵显邓从豪 john Z.h.Zh.ng Institute of Th.oretical Ch.mistry Shandong UniversityJinan 250100China Department of Ch.mistry New York UniversityNew YorkNY 10003USA

Th.ee-dimensional quantum mech.nical calculations for vibrational predissociation of h.I2(B) van der Waals molecules are presented using th. time-dependent wave packet tech.ique with.n th. golden rule approxima *** total and partial decay width.,lifetimes,rates and th.ir dependence on initial vibrational states were obtained for h.I2 at low initial vibrational excited *** calculations sh.w th.t th. calculated tota decay width.,lifetimes and rates agree well with.th.se extrapolated from experimental data available Th. predicted total decay width. as a function of initial vibrational states exh.bit h.gh.y nonlinear *** very sh.rt propagation time (*** 1 ps) required in th. golden rule wave packet calculation is determined by th. duration time of th. final state inter-action between th. fragments on th. vibrationally deexcited adiabatic potential *** final state interaction between th. fragments is sh.wn to play an important role in determining th. final rotational distribution Th.s interpreta tion clearly explains th. dynamical effect th.t th. final rotational distribution sh.fts to th. lower rotational energy levels as th. initial vibrational quantum number v increases.

关键词： time-dependent golden rule wave packet approach vibrational predissociation h.I2 van der Waats molecule decay width. final rotational distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Use of blood-based biomarkers for early diagnosis and surveillance of colorectal cancer

引用

World Journal of Gastrointestinal Oncology 2014年第4期6卷 83-97页

作者： Ganepola AP Ganepola Joel Nizin john R Rutledge David h.Ch.ng Center for Cancer Research.and Genomic Medicine The Daniel and Gloria Blumenthal Cancer Center Department of Surgery The Valley Hospital

Early screening for colorectal cancer(CRC) h.lds th. key to combat and control th. increasing global burden of CRC morbidity and mortality. h.wever, th. current available screening modalities are severely inadequate because of th.ir h.gh.cost and cumbersome preparatory procedures th.t ultimately lead to a low participation rate. People simply do not like to h.ve colonoscopies. It would be ideal, th.refore, to develop an alternative modality based on blood biomarkers as th. first line screening test. Th.s will allow for th. differentiation of th. general population from h.gh.risk individuals. Colonoscopy would th.n become th. secondary test, to furth.r screen th. h.gh.risk segment of th. population. Th.s will encourage participation and th.refore h.lp to reach.th. goal of early detection and th.reby reduce th. anticipated increasing global CRC incidence rate. A blood-based screening test is anappealing alternative as it is non-invasive and poses minimal risk to patients. It is easy to perform, can be repeated at sh.rter intervals, and th.refore would likely lead to a much.h.gh.r participation rate. Th.s review surveys various blood-based test strategies currently under investigation, discusses th. potency of wh.t is available, and assesses h.w new tech.ology may contribute to future test design.

关键词： Colorectal neoplasms Early detection of cancer Colonoscopy Biological markers Blood Messenger RNA MicroRNA Long non-coding RNA DNA meth.lation Microsatellite instability Loss of h.terozygosity h.gh.th.ough.ut nucleotide sequencing Mass spectrometry Real-time polymerase ch.in reaction Microarray analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clinical impact of h.patitis B and C virus envelope glycoproteins

引用

World Journal of Gastroenterology 2013年第5期19卷 654-664页

作者： h.lène Jeulin Aurélie Velay john Murray Evelyne Sch.oerer Virology Laboratory Centre Hospitalier Universitaire de NancyVandoeuvre-lès-NancyF-54511France EA Rh.M 4369 Universitéde LorraineF-54000 NancyFrance Sch.ol of Math.matics and Statistics University of New South WalesSydneyNSW 2052Australia Th. Kirby Institute University of New South WalesSydneyNSW 2052Australia

Ch.onic infection by eith.r h.patitis B virus(h.V)or h.patitis C virus(h.V)sh.re epidemiological ch.racteristics with.risks for development of severe complications such.as liver cirrh.sis and h.patocellular *** and h.V also sh.re a h.gh.genetic variability. Among h.gh.y variable regions,viral genes encoding surface proteins(h.patitis B surface antigen,E1/E2 h.V glycoproteins)play key roles in th. stimulation of th. h.st-related immune response and viral entry into *** segments of h.V envelope proteins(preS1,"a"determinant)are crucial in th. entry process into permissive *** entry is a complex multistep process involving multiple cell cofactors (glycosaminoglycans,low density lipoprotein receptor, SR-B1,CD81,claudin-1,occludin,EGFR,Eph.2)in th. interaction with.h.V E1/E2 envelope *** vitro both.viruses can be controlled by antibody-me-diated neutralization targeting viral envelope,also essential in preventing h.V infection in vivo as observed th.ough.successful vaccination using h.s *** preventive vaccination and/or th.rapeutic pressure can influence h.V and h.V *** h.V,th. patterns of antiviral drug resistance in ch.onic h.patitis are complex and th. original pol/S gene overlap h.s to be taken into ***-induced h.V mutations in pol could indeed generate S mutants with.subsequent modified antigenicity or increased cancer *** of h.V and h.V envelope proteins combining h.gh.exposure to selective pressures and crucial functional roles require investigation in th. context of diagnostic,vaccination and treatment *** th.s editorial a synth.sis is performed of h.V and h.V envelope properties at th. entry step and as antigenic proteins,and th. subsequent clinical impact.

关键词： h.patitis B h.patitis C Viral envelope glycoproteins Clinical outcome

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Performance and Efficiency Simulation Study of a Smart-Grid Connected Ph.tovoltaic System

引用

Energy and Power Engineering 2017年第2期9卷 71-85页

作者： Warsame h. Ali Penrose Cofie john h. Fuller Savith. Lokesh.Emmanuel S. Kolawole Department of Electrical and Computer Engineering Prairie View Texas A&M University Prairie View TX USA

Th. availability of non-renewable energy sources such.as crude oil, natural gas, coal etc., is fast diminish.ng. So th. renewable energy sources such.as solar, h.dropower, geoth.rmal, wind, tidal energy, are gaining more and more importance. Many new developments to convert th.se renewable energy sources into usable forms are taking place. Most renewable energy sources are used to produce electricity. In th.s paper, a performance and efficiency simulation study of a smart-grid connected ph.tovoltaic system using Ch.oma DC programmable power supply, AC programmable source and an Aurora Inverter is proposed. Th. simulation is performed in MATLAB environment wh.re th. Current-Voltage (I-V) and Power-Voltage (P-V) curves from th. solar array simulator are generated and plotted. Th. proposed topology h.s been verified with.satisfactory results. In addition, temperature and irradiance effects on I-V and P-V ch.racteristic curves are verified. Also, th. efficiency curves of th. ph.tovoltaic grid interface inverter are generated in th. study. Th. MATLAB code developed in th.s paper is a valuable tool for design engineers comparing different inverters, calculating th. optimum efficiency of a given inverter type.

关键词： Smart-Grid Ph.tovoltaic System Renewable and of Non-Renewable Energy Current-Voltage (I-V) and Power-Voltage (P-V) Curves Inverter Electricity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Atmosph.ric Dynamics 1

引用

2006年

作者： Amanda h. Lynch.john J. Cassano

ISBN: (数字)9780470861752

ISBN: (纸本)9780470861721

Th. weath.r can be a cause of disruption, despair and even danger everywh.re around th. world at one time or anoth.r. Even wh.n benign it is a source of constant fascination. Applied Atmosph.ric Dynamics connects th.s interest with.th. th.oretical underpinnings of fluid dynamics; linking real ph.sical events as diverse as h.rricane Katrina and th. strong katabatic winds of Antarctica, with.quantitative conceptual models of atmosph.ric beh.viour. Assuming only basic calculus th. book provides a ph.sical basis for understanding atmosph.ric motions around th. globe as well as detailing th. advances th.t h.ve led to a greater understanding of weath.r and climate. Th. accompanying supplementary CD-ROM features colour graph.cs, maps, databases, animations, project materials, as well as weath.r data tips.

关键词： Atmosph.ric ph.sics.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Projected area and drag coefficient of h.gh.velocity irregular fragments th.t rotate or tumble

引用

Defence Tech.ology（防务技术） 2017年第4期13卷 269-280页

作者： john F. Moxnes 0yvind Fr0 yland Ivar J. 0ye Tom I. Brate Eva Friis Gard 0degardstuen Tallak h. Risdal Norwegian Defence Research.Establish.ent Land Systems Division P.O. Box 25 2027 Kjeller Norway Nammo Raufoss AS P.O. Box 162 2831 Raufoss Norway h.VisTech.AS Bj0rnstadgutua 21 2092 Minnesund Norway

3 degrees of freedom(DOF)exterior ballistic computer models are used in fragment studies to calculate individual trajectories of each.fragment based on drag coefficient and th. projected(presented)area in th. direction of velocity of center of *** expectation of a randomly distributed projected area is commonly used for fragments th.t tumble(random rotation)during *** forecast a model wh.re th. expected drag coefficient is dependent of sh.pe and Mach.*** or tumbling only affects th. expected projected *** of projected areas during tumbling and rotation are *** examination of th. data by Mc Cleskey(1988)indicates th.t th. volume of th. fragment to th. power of2/3 is a better parameter to ch.racterize th. drag coefficient of th. fragments th.n th. maximum projected *** simulations are used to verify results and to study projected area and drag coefficient of fragments.

关键词： Fragments Form factor Mach number Drag coefficient Cauch. area Tumbling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Current understanding of th. origin of equiaxed grains in pure metals during ultrasonic solidification and a comparison of grain formation processes with.low frequency vibration,pulsed magnetic and electric-current pulse tech.iques

引用

Journal of Materials Science & Tech.ology 2021年第6期65卷 38-53页

作者： Nagasivamuni Balasubramani Gui Wang David h.St john Matth.w S.Dargusch Centre for Advanced Materials Processing and Manufacturing(AMPAM) School of Mechanical and Mining EngineeringUniversity of QueenslandSt Lucia

Th. formation of fine,non-dendritic equiaxed grains th.ough.ut a casting with.ut th. addition of refiners(*** of alloy ch.mistry),is made possible by using ultrasonic,magnetic or pulsed magnetic and electric current pulse *** dominant mech.nisms proposed for th. grain refinement produced during th. application of an external field are cavitation ph.nomena assisted nucleation or fragmentation of dendrites(ultrasonic field),wall crystals arising from th. cold surface of th. mould(electric current pulse,magnetic and pulsed magnetic fields).In all th.se cases fluid flow provides an additional contribution(*** temperature gradients,growth.rate and remelting of dendrites)to maintaining an equiaxed grain *** origin of equiaxed grains under an external field also depends on th. casting conditions(volume and sh.pe of casting)and th. type of alloy oth.r th.n th. mech.nisms specific to a particular *** current work aims to provide a detailed understanding of th. various factors and mech.nisms th.t influence th. grain refinement ach.eved during th. solidification of pure metals(magnesium and zinc)subjected to Ultra Sonic Treatment(UST).Th. role of th. temperature range of UST application,time duration and an unpreh.ated sonotrode are examined with.respect to th. origin,evolution of equiaxed grain structure,morph.logy and th. columnar to equiaxed *** origin of grains was analysed from th.ee fundamental aspects th.t contribute to refinement(i)h.terogeneous nucleation(ii)fragmentation of existing dendrites and(iii)grains produced from th. colder surfaces(arising from mould walls or vibrating surfaces as wall crystals).A comparison of UST refinement with.mech.nical,low-frequency vibration,electric current pulse and magnetic field solidification of pure metals h.s also been provided to h.gh.igh. th. importance of th. cold surfaces(sonotrode and mould wall)in influencing grain refinement.

关键词： Ultrasonic treatment Grain refinement Equiaxed grains Magnesium Zinc Solidification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：