检索结果-南通市图书馆

High Power Laser Science and Engineering 2019年第1期7卷 10-16页

作者： j.jarrett M.King R.j.Gray N.Neumann L.Dhl C.D.Baird T.Ebert M.Hesse A.Tebartz D.R.Rusby N.C.Woolsey D.Neely M.Roth P.McKenna Department of Physics SUPA University of Strathclyde Institut f¨ur Kernphysik Technische Universit?t Darmstadt York Plasma Institute University of York STFC-Rutherford Appleton Laboratory Institut fur Kernphysik Technische Universit?t Darmstadt

The spatial-intensity profile of light reflected during the interaction of an intense laser pulse with a microstructured target is investigated experimentally and the potential to apply this as a diagnostic of the interaction physics is explored numerically. Diffraction and speckle patterns are measured in the specularly reflected light in the cases of targets with regular groove and needle-like structures, respectively, highlighting the potential to use this as a diagnostic of the evolving plasma surface. It is shown, via ray-tracing and numerical modelling, that for a laser focal spot diameter smaller than the periodicity of the target structure, the reflected light patterns can potentially be used to diagnose the degree of plasma expansion, and by extension the local plasma temperature, at the focus of the intense laser light. The reflected patterns could also be used to diagnose the size of the laser focal spot during a high-intensity interaction when using a regular structure with known spacing.

关键词： high power laser laser-solid interactions plasma temperature diagnosis

The role of dietary fibre in pig production,with a particular emphasis on reproduction

在线全文

学校读者我要写书评

暂无评论

journal of Animal Science and Biotechnology 2018年第4期9卷 783-793页

作者： Selene jarrett Cheryl j.Ashworth The Roslin Institute and R(D)SVS University of Edinburgh

Fibres from a variety of sources are a common constituent of pig feeds. They provide a means to utilise locallyproduced plant materials which are often a by-product of the food or drink industry. The value of a high fibre diet in terms of producing satiety has long been recognised. However the addition of fibre can reduce feed intake, which is clearly detrimental during stages of the production cycle when nutrient needs are high, for example in growing piglets and during lactation. More recently, fibre has been found to promote novel benefits to pig production systems,particularly given the reduction in antimicrobial use world-wide, concern for the welfare of animals fed a restricted diet and the need to ensure that such systems are more environmentally friendly. For example, inclusion of dietary fibre can alter the gut microbiota in ways that could reduce the need for antibiotics, while controlled addition of certain fibre types may reduce nitrogen losses into the environment and so reduce the environmental cost of pig *** particular potential value is the opportunity to use crude fibre concentrates as ’functional’ feed additives to improve young pig growth and welfare. Perhaps the greatest opportunity for the use of high fibre diets is to improve the reproductive efficiency of pigs. Increased dietary fibre before mating improves oocyte maturation, prenatal survival and litter size; providing a consumer-acceptable means of increasing the amount of saleable meat produced per sow. The mechanisms responsible for these beneficial effects remain to be elucidated. However, changes in plasma and follicular fluid concentrations of key hormones and metabolites, as well as effects of the hypothalamic satiety centre on gonadotrophin secretion and epigenetic effects are strong candidates.

关键词： Fibre Pig Pregnancy Production Reproduction

Templating core-shell particles using metal ion-chelating biosurfactants

在线全文

学校读者我要写书评

暂无评论

Particuology 2022年第5期20卷 145-152页

作者： Ching-Min Yeh Thomas jarrett Yuan Gao Chun-Xia Zhao Andrew Whittaker Frank Sainsbury Alison L.White Australian Institute of Bioengineering and Nanotechnology The University of QueenslandSt.LuciaQueensland4072Australia ARC Centre of Excellence in Convergent Bio-Nano Science and Technology The University of QueenslandSt Lucia4072Australia CSIRO Probing Biosystems Future Science Platform BrisbaneAustralia Centre for Cell Factories and Biopolymers Griffith Institute for Drug DiscoveryGriffith UniversityBrisbaneQLD4111 Australia

Designer biosurfactants can be used to stabilise and functionalise *** particularly promising use is the stabilisation of oil-in-water emulsions,enabling fine tuning physical,chemical and biological surface *** ability of emulsion systems to carry high payloads makes them attractive for applications in medicine,food and fragrances,and ***,they have limited long-term *** we sought to use the metal ion-chelating ability of the biosurfactant peptide,AM1,to precipitate the formation of a gold metal shell on AM1-stabilised emulsions by electroless *** found that replacing the commonly used zinc(Ⅱ)with palladium(Ⅱ)for coordination by histidine residues of adjacent AM1 peptides produced interfacial films that maintained elasticity at acidic *** NMR suggested a coordination mechanism independent of the imidazole ring of the *** of emulsions at low pH enabled the deposition of a gold shell,albeit by an unexpected *** propose that gold nanoparticles forming in bulk are adsorbed onto the peptide-stabilised interface,accumulating into a particulate *** resulting one-step method for nanoparticle precipitation and shell formation will be useful for the creation of biocompatible core-shell particles for applications where large payloads of hydrophobic active compounds require stability over long time periods.

关键词： Biosurfactants Emulsion Core-shell particles Electroless plating Histidine Interfacial elasticity

A meta-analytic review of the approach-avoidance achievement goals and performance relationships in the sport psychology literature

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

journal of Sport and Health Science 2015年第2期4卷 164-173页

作者： Marc Lochbaum jarrett Gottardy Department of Health Exercise and Sport Sciences Texas Tech University

Purpose： To summarize the approach-avoidance achievement goal and performance in the sport psychology ***： A total of 17 published studies, two of which provided two samples, were located. Accepted meta-analytic procedures were used with Hedges g as the effect size metric. From the 17 studies, 73 effect sizes were ***： Results based on a random effects model indicated that the performance goal contrast had the largest facilitative impact on performance followed by the mastery and performance approach goals. Both of the avoidance goals performance and mastery had small non-significant and detrimental effects on performance. The homogeneity statistics revealed significant heterogeneity for the approach and avoidance performance goals. Categorical moderator variables were examined for study sex composition（male, female, or mixed）, mean age of sample（〈18 years or 18 years）, study setting（lab or naturalistic）, and nature of performance variable（objective or subjective）.Conclusion： The performance goal contrast holds value for sport performance research. Contrary to approach-avoidance predictions, the mastery-approach goal and performance effect size was significant and of equal magnitude as the performance approach goal and performance effect size. Thus, future research should closely test the efficacy of both the mastery- and performance contrasts in impacting performance of sport tasks. Last, the significant effect sizes reported in this review are in stark contrast to contemporary meta-analytic findings in *** in the approach-avoidance goals in sport and education relative to performance should be researched further.

关键词： Mastery approach goals Performance approach goals Performance enhancement Performance goal contrast

Two-color multiphoton in vivo imaging with a femtosecond diamond Raman laser

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2017年第1期6卷 400-407页

作者： Evan P Perillo jeremy W jarrett Yen-Liang Liu Ahmed Hassan Daniel C Fernée john R Goldak Andrei Bonteanu David j Spence Hsin-Chih Yeh Andrew K Dunn Department of Biomedical Engineering The University of Texas at AustinTX 78712USA Department of Physics The University of Texas at AustinTX 78712USA MQ Photonics Department of Physics and AstronomyMacquarie UniversitySydneyNSW 2109Australia

Two-color multiphoton microscopy through wavelength mixing of synchronized lasers has been shown to increase the spectral window of excitable fluorophores without the need for wavelength ***,most currently available dual output laser sources rely on the costly and complicated optical parametric generation *** this report,we detail a relatively simple and low cost diamond Raman laser pumped by a ytterbium fiber amplifier emitting at 1055 nm,which generates a first Stokes emission centered at 1240 nm with a pulse width of 100 *** two excitation wavelengths of 1055 and 1240 nm,along with the effective two-color excitation wavelength of 1140 nm,provide an almost complete coverage of fluorophores excitable within the range of 1000–1300 *** compared with 1055 nm excitation,two-color excitation at 1140 nm offers a 90%increase in signal for many far-red emitting fluorescent proteins(for example,tdKatushka2).We demonstrate multicolor imaging of tdKatushka2 and Hoechst 33342 via simultaneous two-color two-photon,and two-color three-photon microscopy in engineered 3D multicellular *** further discuss potential benefits and applications for two-color three-photon *** addition,we show that this laser system is capable of in vivo imaging in mouse cortex to nearly 1 mm in depth with two-color excitation.

关键词： microscopy nonlinear processes three-dimensional imaging ultrafast lasers

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

美国早期特殊教育师资培养体系反思及启示

中国特殊教育 2010年第5期 58-64页

作者：苏雪云 Toby Long Lorelei Emma Marian jarrett 华东师范大学特殊教育学系上海200062 乔治敦大学儿童与人类研究中心美国华盛顿特区20057 乔治华盛顿大学教育与人类发展研究院美国华盛顿特区20057

早期特殊教育不仅在促进每个障碍儿童的发展和提高其家庭生活质量方面起着至关重要的作用,而且有着巨大的社会效益和经济效益,是和谐社会的重要组成部分。美国法律规定0-21岁的所有障碍儿童有权获得免费和适当的教育,由具有专业化水平... 详细信息

早期特殊教育不仅在促进每个障碍儿童的发展和提高其家庭生活质量方面起着至关重要的作用,而且有着巨大的社会效益和经济效益,是和谐社会的重要组成部分。美国法律规定0-21岁的所有障碍儿童有权获得免费和适当的教育,由具有专业化水平的相关人员为这些儿童提供服务和支持。本文从政策层面到实践层面对美国的早期特殊教育师资培养体系进行了系统、全面地分析,了解其现状和存在的挑战,以及未来发展的趋势,以期为促进我国早期特殊教育师资培养体系的发展提供一些理论和实践上的参考。

关键词：早期特殊教育师资培养

Effective Thermoelectric Power Generation in an Insulated Compartment

在线全文

学校读者我要写书评

暂无评论

World journal of Condensed Matter Physics 2014年第3期4卷 153-165页

作者： Harkirat S. Mann Yosyp Schwab Brian N. Lang jarrett L. Lancaster Ronald j. Parise Giovanna Scarel Department of Nano-Science at the joint School of Nano-Science and Nano-Engineering (jSNN) University of North Carolina at Greensboro and North Carolina A&T University Greensboro USA Department of Physics and Astronomy James Madison University Harrisonburg USA Parise Research Technologies Suffield USA

The Seebeck coefficient S is a temperature- and material-dependent property, which linearly and causally relates the temperature difference △T between the “hot” and “cold” junctions of a thermoelectric power generator (TEC-PG) to the voltage difference △V. This phenomenon is the Seebeck effect (SE), and can be used to convert waste heat into usable energy. This work investigates the trends of the effective voltage output △V(t) and effective Seebeck coefficient S'(t) versus several hours of activity of a solid state TEC-PG device. The effective Seebeck coefficient S'(t) here is related to a device, not just to a material’s performance. The observations are pursued in an insulated compartment in various geometrical and environmental configurations. The results indicate that the SE does not substantially depend on the geometrical and environmental configurations. However, the effective Seebeck coefficient S'(t) and the produced effective △V(t) are affected by the environmental configuration, once the temperature is fixed. Heat transfer calculations do not completely explain this finding. Alternative explanations are hypothesized.

关键词： Thermoelectric Heat Conduction Energy Harvesting

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

汽车发动机用粉末冶金主轴承盖

粉末冶金技术 2009年第5期27卷 387-393页

作者： Terry M.Cadle Mark A.jarrett William L.Miller 韩凤麟机构不详

粉末冶金主轴承盖(MBC)于1993年第一次用于GM的3100与3800V6发动机。该零件一年消耗粉末5 000多t,是北美粉末冶金零件中应用量最大者。选择粉末冶金材料替代传统的铸铁,是因为其有利于零件的功能,而且因为粉末冶金工艺能成形为最终形状... 详细信息

粉末冶金主轴承盖(MBC)于1993年第一次用于GM的3100与3800V6发动机。该零件一年消耗粉末5 000多t,是北美粉末冶金零件中应用量最大者。选择粉末冶金材料替代传统的铸铁,是因为其有利于零件的功能,而且因为粉末冶金工艺能成形为最终形状,从而使GM可节省下对主轴承盖的切削加工生产线的大部分投资。由于灰铸铁强度不够高,球墨铸铁的价格高又难切削加工,因此,为这种零件开发了一种强度高、成本低的粉末冶金合金钢。这篇论文说明了主轴承盖的功能要求,比较了铸铁与粉末冶金的材料和生产工艺,说明了粉末冶金的设计利益;此外,还讨论了粉末冶金主轴承盖要求的强度、一致性、完善性(无缺陷)及切削性,其中包括试验与试验验证。

关键词：粉末冶金主轴承盖汽车发动机

在线全文

学校读者我要写书评

暂无评论

铝电解槽的技术现状及未来发展(一)

轻金属 1983年第9期 30-33页

作者： jarrett 冯乃祥

自从霍耳-埃鲁特电解法问世以来,节省投资和电能成为铝工业发展中的重大课题。由于电解槽的电流强度决定着铝电解的生产率和电耗率,因此铝电解槽的设计必须在投资和能耗之间权衡考虑。铝电解槽的技术现状近年来铝电解槽的进步是由多方... 详细信息

自从霍耳-埃鲁特电解法问世以来,节省投资和电能成为铝工业发展中的重大课题。由于电解槽的电流强度决定着铝电解的生产率和电耗率,因此铝电解槽的设计必须在投资和能耗之间权衡考虑。铝电解槽的技术现状近年来铝电解槽的进步是由多方面的改进所致,其中包括阳极尺寸和电解质成份的改进,电解槽磁场对铝水搅动的控制,固体整流

关键词：工业电解槽电流效率极距投资电能效率电流密度阳极效应极间距财政管理跟效应电解槽侧壁

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

铝电解槽的技术现状及其未来发展(二)

轻金属 1983年第10期 25-29页

作者： jarrett 冯乃祥

4.预焙阳极预焙阳极的电阻在0.005～0.006欧姆·厘米之间,阳极电流密度在0.6～1.3安培/厘米~2之间。自焙阳极的电阻大约高于预焙阳极的电阻30％,自焙槽省钱省工,并且可节省预焙阳极制造所需要的能量。但是却正在被淘汰,此系因为这种槽... 详细信息

4.预焙阳极预焙阳极的电阻在0.005～0.006欧姆·厘米之间,阳极电流密度在0.6～1.3安培/厘米~2之间。自焙阳极的电阻大约高于预焙阳极的电阻30％,自焙槽省钱省工,并且可节省预焙阳极制造所需要的能量。但是却正在被淘汰,此系因为这种槽的电流效率低,并且在收集和净化阳极烟气方面存在着很大的困难。阳极质量影响铝电解槽的电能效率和铝电

关键词：电解槽热量极距鲁特槽衬电解池极间距槽绝缘惰性阳极碳块碳渣电流效率焙烧阳极