检索结果-南通市图书馆

Environmental temperatures,physiology and behavior limit the range expansion of invasive Burmese pythons in southeastern USA

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2012年第3期7卷 271-285页

作者： Elliott R.JACOBSON David G.barker Tracy M.barker Richard MAULDIN Michael L.AVERY Richard ENGEMAN Stephen SECOR College of Veterinary Medicine University of FloridaGainesvilleFlorida Vida Preciosa International(VPI) BoerneTexas US Department of Agriculture Wildlife ServicesNational Wildlife Research CenterFort CollinsColorado US Department of Agriculture Wildlife ServicesNational Wildlife Research CenterGainesvilleFlorida Department of Biological Sciences University of AlabamaTuscaloosaAlabamaUSA

A well-established population of Burmese pythons resides in the Everglades of southern *** in part by a report that identified much of southern USA as suitable habitat for expansion or establishment of the Burmese python,we examined the plausibility of this snake to survive winters at sites north of the *** integrated daily low and high temperatures recorded from October to February from 2005-2011 at Homestead,Orlando and Gainesville,Florida;and Aiken,South Carolina,with minimum temperatures projected for python digestion(16℃),activity(5℃)and survival(0℃).Mean low and high temperatures decreased northward from Homestead to Aiken and the number of days of freezing temperatures increased *** was impaired or inhibited for 2 months in the Everglades and up to at least 5 months in Aiken,and activity was increasingly limited northward during these *** of overwinter survivorship document that a single bout of low and freezing temperatures results in python *** capacity for Burmese pythons to successfully overwinter in more temperate regions of the USA is seemingly prohibited because they lack the behaviors to seek refuge from,and the physiology to tolerate,cold *** tropical Southeast Asia is the source of the Everglades Burmese pythons,we predict it is unlikely that they will be able to successfully expand to or colonize more temperate areas of Florida and adjoining states due to their lack of behavioral and physiological traits to seek refuge from cold temperatures.

关键词： ambient temperature Burmese python invasion snake thermal tolerance

AFast Solver for an H_(1) Regularized PDE-Constrained Optimization Problem

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

Communications in Computational Physics 2016年第1期19卷 143-167页

作者： Andrew T.barker Tyrone Rees Martin Stoll Center for Applied Scientific Computing Lawrence Livermore National LaboratoryMail Stop L-561LivermoreCA 94551USA Numerical Analysis Group Scientific Computing DepartmentRutherford Appleton LaboratoryChiltonDidcotOxfordshireOX110QXUnited Kingdom Computational Methods in Systems and Control Theory Max Planck Institute for Dynamics of Complex Technical SystemsSandtorstr.139106MagdeburgGermany

In this paperwe consider PDE-constrained optimization problemswhich incorporate an H_(1)regularization control *** focus on a time-dependent PDE,and consider both distributed and boundary *** problems we consider include bound constraints on the state,and we use a Moreau-Yosida penalty function to handle *** propose Krylov solvers and Schur complement preconditioning strategies for the different problems and illustrate their performance with numerical examples.

关键词： Preconditioning Krylov methods PDE-constrained optimization optimal control of PDEs

Reviewing the Safe Shipping of Lithium-Ion and Sodium-Ion Cells:A Materials Chemistry Perspective

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

Energy Material Advances 2021年第1期2021卷 1-12页

作者： Ashish Rudola Christopher J.Wright Jerry barker Faradion Limited The Innovation Centre217 PortobelloSheffield S14DPUK

High energy density lithium-ion(Li-ion)batteries are commonly used *** decades’worth of intense research has led to a good understanding on several aspects of such ***,the issue of their safe storage and transportation is still not widely understood from a materials chemistry *** international regulations require Li-ion cells to be shipped at 30%SOC(State of Charge)or *** this article,the reasons behind this requirement for shipping Li-ion batteries are firstly reviewed and then compared with those of the analogous and recently commercialized sodium-ion(Na-ion)*** such alkali-ion batteries,the safest state from their active materials viewpoint is at 0V or zero energy,and this should be their ideal state for storage/***,a“fully discharged”Li-ion cell used most commonly,composed of graphitebased anode on copper current collector,is not actually at 0V at its rated 0%SOC,contrary to what one might expect—the detailed mechanism behind the reason for this,namely,copper dissolution,and how it negatively affects cycling performance and cell safety,will be summarized *** will be shown that Na-ion cells,capable of using a lighter and cheaper aluminum current collector on the anode,can actually be safely discharged to 0V(true 0%SOC)and beyond,even to reverse polarity(negative voltages).It is anticipated that this article spurs further research on the 0V capability of Na-ion systems,with some suggestions for future studies provided.

关键词： cycling summarized alkali

Assimilation and Simulation of Typhoon Rusa (2002) Using the WRF System

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

Advances in Atmospheric Sciences 2005年第3期22卷 415-427页

作者：顾建峰 QingnongXIAO Ying-HwaKUO DaleM.barker 薛纪善马晓星 ChineseAcademyofMeteorologicalSciences Beijing100081／／NationalCenterforAtmosphericResearchBoulderColorado80307，USA NationalCenterforAtmosphericResearch BoulderColorado80307USA ChineseAcademyofMeteorologicalSciences Beijing100081 ShanghaiWeatherForecastCenter Shanghai200030

Using the recently developed Weather Research and Forecasting (WRF) 3DVAR and the WRF model, numerical experiments are conducted for the initialization and simulation of typhoon Rusa (2002). The observational data used in the WRF 3DVAR are conventional Global Telecommunications System (GTS) data and Korean Automatic Weather Station (AWS) surface observations. The Background Error Statistics (BES) via the National Meteorological Center (NMC) method has two different resolutions, that is, a 210-km horizontal grid space from the NCEP global model and a 10-km horizontal resolution from Korean operational forecasts. To improve the performance of the WRF simulation initialized from the WRF 3DVAR analyses, the scale-lengths used in the horizontal background error covariances via recursive filter are tuned in terms of the WRF 3DVAR control variables, streamfunction, velocity potential, unbalanced pressure and specific humidity. The experiments with respect to different background error statistics and different observational data indicate that the subsequent 24-h the WRF model forecasts of typhoon Rusa's track and precipitation are significantly impacted upon the initial fields. Assimilation of the AWS data with the tuned background error statistics obtains improved predictions of the typhoon track and its precipitation.

关键词： 3DVAR data assimilation background error statistics numerical simulation typhoon

Direct ink writing of polycaprolactone/polyethylene oxide based 3D constructs

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2021年第2期31卷 180-191页

作者： Bin Zhang Se Hun Chung Susan barker Duncan Craig Roger J.Narayan Jie Huang Department of Mechanical Engineering University College London Medway School of Pharmacy Universities of Greenwich and Kent School of Pharmacy University College London Joint Department of Biomedical Engineering University of North Carolina and North Carolina State University

There has been increasing interest over recent years in the application of three-dimensional(3 D) printing technologies in the biomedical field. One such method is Direct Ink Writing(DIW); this approach has the potential advantage of allowing room-temperature deposition of materials, presented as an ink, to build complex architectures. DIW offers the ability to process biomaterials containing temperature-sensitive components. Due to the fabrication principles of DIW, there are specific rheological requirements that the ink must exhibit for the 3 D construction. For this reason, hydrogel-based liquid feed stocks have been the focal point of ink development. As a consequence, studies based on inks comprising hydrophobic biomaterials, which are insoluble in water and hence unsuited to the hydrogel approach, have been *** this study, we investigate novel inks that utilize polycaprolactone(PCL), a hydrophobic polymer, as the primary constituent by dissolving the polymer in solvent systems based on dichloromethane(DCM) and acetone(ACE). Moreover, polyethylene oxide(PEO) was incorporated into the PCL systems in order to extend the range of hydrophilicity of the systems. The rheological properties of the inks were investigated as a function of polymer composition and solvent system. Woodpile constructs of PCL and PCL/PEO were fabricated using DIW method and were assessed by a series of material characterisation. The type of solvent system had a noticeable impact on the ink rheology, which ultimately affected the surface properties. The incorporation of PEO particularly enhanced the roughness and wettability of the constructs. Our results support the use of DIW as a new means to process hydrophobic polymers for biomedical applications.

关键词： Direct ink writing Polycaprolactone Polyethylene oxide Ink rheology Material characterisation 3D construct

Agronomy, Nutritional Value, and Medicinal Application of Faba Bean(Vicia faba L.)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2019年第4期5卷 170-182页

作者： Fatemeh Etemadi Masoud Hashemi Allen V.barker Omid Reza Zandvakili Xiaobing Liu Stockbridge School of Agriculture University of Massachusetts AmherstMA01003USA Northeast Institute of Geography and Agroecology Chinese Academy of SciencesHarbin150081China

Faba bean(Vicia faba L.) is a cool season grain legume crop with the potential to be grown as multi-purpose crop in areas with short growing season. Faba bean is grown in many regions in the world due to its high nutritional value, medicinal effect, and effective biological nitrogen fixation. Diverse ecosystem benefits are expected from integrating faba bean in cropping systems. This paper specifically reviews the published work covering agronomic practices, nutritional values, medicinal benefits, and faba bean’s capacity for nitrogen fixation.

关键词： Biomass Faba bean L-Dopa Nitrogen fixation Nutrient

The elements of logic / Stephen F. barker. 6th ed.

在线全文

学校读者我要写书评

暂无评论

A comparison of handheld and standard ultrasound in Swiss medical students

2003年

作者： Stephen F. barker.

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

World Journal of Emergency Medicine 2022年第2期13卷 85-90页

作者： Mark Slader Hayley Young Margot barker Kylie Prentice Katherine Bogaard Charlene Yuan Soheil Saadat Shadi Lahham School of Medicine University of CaliforniaIrvine 92617USA Department of Emergency Medicine University of CaliforniaIrvine 92868USA

BACKGROUND:The use of ultrasound(US)within healthcare has inspired the development of new US *** have been few studies comparing the use of handheld US to standard US for medical *** research aims to determine whether a handheld US device can provide a comparable primary learning experience to that of a standard US ***:Over two days of instruction,participants were taught and evaluated on core US *** standard group received instruction on standard US machines,while the handheld group received instruction on handheld US *** completed a qualitative survey regarding their *** hundred and four images were obtained and graded by two emergency medicine ***:A total of 119 Swiss medical students were enrolled in our *** was no statistically significant difference in the US assessment measurements,except for faster endpoint septal separation(EPSS)vascular setup time in the handheld group(P=0.001).There was no statistically significant difference in participants’perceived difficulty of US learning(P=0.198),comfort level(P=0.188),or self-estimated capability to perform US in the future(P=0.442).There was no statistically significant difference in the percentage of correctly obtained images(P=0.211)or images that were clinically useful(P=0.256).The median quality score of images obtained by the standard group was eight compared to seven in handheld group(P<0.01).CONCLUSION:Our data suggest a handheld US machine can perform as well as a standard US machine as an educational tool despite sacrifices in image quality.

关键词： Handheld ultrasound Ultrasound education Switzerland Medical education