检索结果-南通市图书馆

Mind the “Gap”: A Comparison of the Weekly Training Loads of English Premier League Academy Soccer Players in Under 23, Under 18 and Under 16 Age-Groups

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Science in Sport and Exercise 2023年第1期5卷 34-43页

作者： Jonathan M.taylor Jonathan L.Madden Frances hunter Ben J.Thorne Shaun J.McLaren School of health and Life Sciences Teesside UniversityMiddlesbroughUK Leeds United Football Club LeedsUK Middlesbrough Football Club MiddlesbroughUK hintsa Performance LondonUK Department of Sport and Exercise Sciences Durham UniversityDurhamUK

Purpose The transition into full-time training represents a key period in the development of young soccer *** we compared the weekly training loads(matches,field-,and resistance-training)of English Premier-League Academy soccer players from under-16(U16),under-18(U18)and under-23(U23)age-groups during a training *** Forty players(U16 n=13,U18 n=15 and U23 n=12)were monitored using global navigation satellite systems and differential ratings of perceived exertion(dRPE).External load metrics were total distance,high-speed running distance,[absolute:≥19.8 km/h,relative:≥87%of 30-15 final-velocity(vIFT)],sprint distance(absolute:≥25.2 km/h,relative:≥80%maximal sprint speed),and dynamic stress *** load metrics were dRPE training *** Other than relative sprint distance,overall weekly external training loads were substantially greater for U18s and U23s when compared with U16s[effect size range:1.09-1.99(moderate to large);±90%confidence limits~0.45].When compared with U16s,overall internal loads were substantially greater for U18s[0.69-0.95(moderate);±~0.40],but not *** in weekly training loads between U18s and U23s were *** Substantial differences in training loads between elite U16 players and their older counterparts,indicates the need for planned increases in training loads in anticipation of the transition into full-time training.

关键词： Team-sports RPE LTAD Individualised training Training load

Solvation Structure and Dynamics of Mg(TFSI)_(2) Aqueous Electrolyte

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 & Environmental Materials 2022年第1期5卷 295-304页

作者： Zhou Yu taylor R.Juran Xinyi Liu Kee Sung han hui Wang Karl T.Mueller Lin Ma Kang Xu Tao Li Larry A.Curtiss Lei Cheng Materials Science Division Argonne National LaboratoryLemont IL 60439USA Joint Center for Energy Storage Research(JCESR) Lemont IL 60439USA Department of Physics Binghamton UniversityState University of New York4400 Vestal Parkway EastBinghamton NY 13902USA Department of Chemistry and Biochemistry Northern Illinois UniversityDeKalb IL 60115USA Physical and Computational Sciences Directorate Pacific Northwest National LaboratoryRichland WA 99352USA Energy&Environment Directorate Pacific Northwest National LaboratoryRichland WA 99352USA Energy Storage Branch Energy and Biotechnology DivisionSensor and Electronics DirectorateU.S.Army Research LaboratoryAdelphi MD 20783USA Department of Chemistry and Biochemistry Northern Illinois University DeKalb IL 60115 USA X-ray Science Division Argonne National Laboratory Lemont IL 60439 USA

Using ab initio molecular dynamics(AIMD)simulations,classical molecular dynamics(CMD)simulations,small-angle X-ray scattering(SAXS),and pulsed-field gradient nuclear magnetic resonance(PFG-NMR),the solvation structure and ion dynamics of magnesium bis(trifluoromethanesulfonyl)imide(Mg(TFSI)_(2))aqueous electrolyte at 1,2,and 3 m concentrations are *** AIMD and CMD simulations,the first solvation shell of an Mg;ion is found to be composed of six water molecules in an octahedral configuration and the solvation shell is rather *** TFSI^(-)ions prefer to stay in the second solvation shell and ***,the comparable diffusion coefficients of positive and negative ions in Mg(TFSI)_(2)aqueous electrolytes have been observed,which is mainly due to the formation of the stable[Mg(h_(2)O_(6))_(2)]^(+)complex,and,as a result,the increased effective Mg ion ***,the calculated correlated transference numbers are lower than the uncorrelated ones even at the low concentration of 2 and 3 m,suggesting the enhanced correlations between ions in the multivalent *** work provides a molecular-level understanding of how the solvation structure and multivalency of the ion affect the dynamics and transport properties of the multivalent electrolyte,providing insight for rational designs of electrolytes for improved ion transport properties.

关键词： Mg(TFSI)_(2)aqueous electrolyte molecular dynamics simulation pulsed-field gradient nuclear magnetic resonance small-angle X-ray scattering ion dynamics

维普期刊数据库

两株异养细菌Providencia rettgeri YL和Alcaligenes faecalis NR脱除能力的研究

在线全文

学校读者我要写书评

暂无评论

两株异养细菌Providencia rettgeri YL和Alcaligenes faecalis NR...

作者： Shauna taylor 上海交通大学

学位级别：硕士

存在于水体中的含氮物质,已经成为很多年里,造成水体污染的主要原因之一。水体中的氮主要以氨氮,亚硝酸盐和硝酸盐的形式存在。他们主要是由于工业、农业和市政污水缺少足够的处理,直接排放而进入到水体中,造成了非常严重的环境和健康... 详细信息

存在于水体中的含氮物质,已经成为很多年里,造成水体污染的主要原因之一。水体中的氮主要以氨氮,亚硝酸盐和硝酸盐的形式存在。他们主要是由于工业、农业和市政污水缺少足够的处理,直接排放而进入到水体中,造成了非常严重的环境和健康问题。涉及到含氮物质污染的水体主要表现为水中溶解氧好尽,水体毒性增强以及水体的富营养化。为了降低含氮物质对环境的负面影响,找到有效的处理方法是至关重要的。传统的处理方法是在排放到接受水体前,通过活性污泥来降低水中氮的含量。活性污泥法是用在自然界的微生物来降解水中含碳,含氮及含磷的化合物。这些微生物在自然界中,不论是在高或者是低的营养环境里,通过硝化和反硝化来完成降解过程。 Nitrification and Denitrification硝化和反硝化硝化和反硝化是发生在活细菌细胞中的两个化学反应,是氮循环中的重要组成部分。生物脱氮其实是硝化和反硝化两个步骤。在第一个步骤(硝化),氨氮在有氧的条件下转化成硝态氮,在第2步(反硝化)中,生成的硝氮在缺氧的环境里,被进一步转化为一氧化二氮或氮气。传统意义上,硝化也被认为是两步生化反应过程,两步反应方程如下所示。而这两步反应需要截然不同的两组细菌的催化才能完成。首先,在氨氧化菌(AOB)的作用下,氨氮首先被氧化成亚硝酸氮,然后再在亚硝酸氧化菌(NOB)的作用下,亚硝酸根最终被氧化成硝酸根。Nh+ + 3O→NO + hO + 2h NO + O→NO 反硝化是指亚硝酸根或硝酸根转化成氮气或者氮的氧化物的过程。由生物活动实现这个过程的称为生物反硝化,而通过化学减少亚硝酸根或者其他不稳定的氮的化合物则称为化学反硝化。整个反硝化过程是一个循序渐进的过程。NO→NO→X→NO→N其中的X可能是指NO。 heterotrophic Nitrification异养细菌硝化 Bock和Wagner (2003) [15]对异养硝化的定义是在好氧的条件下,氨氮、羟胺或者其它含氨的有机化合物,通过各种类型的化学生物有机体,氧化成亚硝酸盐和硝酸盐的过程。在异养反硝化中,生物生长完全依懒于有机质的氧化。除了细菌,其它的微生物也能发生异养反硝化,特别是曲霉菌、青霉菌和放线菌。不同于由自养细菌所发生的反应,异养硝化是一个典型的发生在一个过程中的两级反应,且每级反应中需要的细菌种类也不同。和自养硝化菌相比,大多的异氧硝化菌只有在生长活性期后,才开始作用于亚硝酸根和硝酸根。然而,很多异养硝化菌是有能够氧化氮化合物的能力的。事实上,它们不仅能氧化氨氮、羟胺和亚硝酸根,也能氧化许多有机氮化物。已证实的异养硝化产物包括了:亚硝酸根、硝酸根、氧肟酸、肟、亚硝基和硝基化合物。通常,异养硝化的最终产物是硝酸盐,但是一些异养硝化菌也同时具有反硝化的能力。因此,这一类的细菌能同时把硝酸根还原成氮气或者是其它一些挥发性的氮的化合物。最近的相关研究主要集中在一些能在有机质上,发生生物反硝化作用的异养硝化细菌,因为,这一类型的细菌能够通过形成氮气或者其它含氮气体,来完成整个去除水中溶解氮的过程。 Aerobic Denitrification好氧反硝化好氧反硝化是一个在半好氧或者全好氧的条件下,还原硝酸盐,生成一氧化氮、氧化亚氮和氮气的过程。在很多年里,由于能提供厌氧能量,反硝化一直被认为是一个厌氧过程。在反硝化过程中,第一步:硝酸先被两种酶(膜结合硝酸盐还原酶和细胞周质硝酸盐还原酶)活化,其中膜结合硝酸盐还原酶在好氧条件下作用明显,而细胞周质硝酸盐还原酶主要作用在缺氧的环境中。和有氧呼吸一样,在反硝化过程中,有机物可以完全转化成二氧化碳,而如下所列的异养细菌要么能实现完全的反硝化过程要么能实现部分的反硝化:Achromobacter, Acinetobacter, Agrobacterium, Alcaligenes, Arthrobacter, Bacillus, Chromobacterium, Corynebacterium, Flavobacterium, hypomicrobium, Moraxella, Neisseria, Paracoccus, Propionibacterium, Pseudomonas, Rhizobium, Rhodopseudomonas, Spirillium和Vibrio。但是大部分的这些细菌在市政污水中含量很低。 Research Background (研究背景) 为了调查控制同步硝化和反硝化的条件和反应过程,我们实验室曾进行过一个膜生物反应器的研究。在这项研究里,连续实验是通过控制反应条件和配置的废水所展开的,实验证实整个系统脱氮能力可达80%,并在系统中分离出三种细菌。在对分离出来的细菌中,进一步的实验则证实了它们异氧硝化和好氧反硝化的作用。接下来则要对于

关键词：水体污染富营养化氨氮脱除硝化反应

On the exoneration of Dr. William h. Stewart: debunking an urban legend

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2013年第1期2卷 17-21页

作者： Brad Spellberg Bonnie taylor-Blake Los Angeles Biomedical Research Institute at harbor-University of California at Los Angeles(UCLA)Medical Center TorranceCAUSA The David Geffen School of Medicine at UCLA Los AngelesCAUSA University of North Carolina School of Medicine Chapel hill WilmingtonNCUSA

Background:It is one of the most infamous quotes in the history of biomedicine:“It is time to close the book on infectious diseases,and declare the war against pestilence won.”Long attributed to the United States Surgeon General,*** ***(1965-1969),the statement is frequently used as a foil by scientific and lay authors to underscore the ever-increasing problems of antibiotic-resistant and emerging ***,the primary source for the quote has never been ***:We undertook a comprehensive search of multiple databases encompassing medical literature,news articles,and congressional records to attempt to identify sources for the ***:No source of the quote was ***,a trail of source documents was identified that clearly serves as the basis for subsequent,incorrect attribution of the quote to *** multiple source documents,*** made statements to the opposite effect,clearly recognizing that infectious diseases had not been *** urban legend was created by a combination of lack of primary witnesses to the originating speech,misunderstanding of points made by *** in the speech,and increasing societal concern about emerging and re-emerging infectious ***:Attribution to *** of a belief that it was time to close the book on infectious diseases is an urban legend;he never made any such *** other verifiable sources,however,confirm that other people in academia adopted this *** should no longer be cited in this regard,and should be replaced with verifiable sources.

关键词： William h.Stewart Urban legend history of antibiotics Antibiotic development Antibiotic crisis Public policy

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

热浸镀锌超高强钢板钒微合金化技术研究

钢铁钒钛 2016年第6期37卷 35-45页

作者： hutchinson B Martin D Karlsson O Lindberg F Thoors h Marceau R K W taylor A S 瑞典腐蚀与金属研究所迪肯大学前沿材料研究所

对超高强度钢板进行热处理,模拟热浸镀锌和合金化镀锌工艺的热循环,并考察获得的力学性能和微观组织。研究用钢含有适量的碳（~0.2%）、锰（1.2%）和铬（0.4%）,保证钢板在奥氏体化后在镀锌前的连续退火线上进行快速冷却时能够完全转变... 详细信息

对超高强度钢板进行热处理,模拟热浸镀锌和合金化镀锌工艺的热循环,并考察获得的力学性能和微观组织。研究用钢含有适量的碳（~0.2%）、锰（1.2%）和铬（0.4%）,保证钢板在奥氏体化后在镀锌前的连续退火线上进行快速冷却时能够完全转变成马氏体。采用不同的钒含量（0~0.1%）和氮含量（0.002%~0.012%）,研究这些微合金化元素对回火马氏体强度的影响。尤其与高氮相配合情况下,钒有助于抵抗回火效应,因此在镀锌后大部分原始强化贡献被保留下来,使得钢的抗拉强度超过1 000 MPa。使用铝或硅进行不同脱氧试验,发现在同一碳含量下两者具有相同的强度水平,但是Si镇静钢的弯曲性能明显优异。对退火钢板进行微观组织观察,但是钒产生有益作用的原因还未完全掌握。通过研究得出这样结论：钒微合金化对耐腐蚀超高强度钢板的开发而言是一种极具前景的途径。

关键词：薄钢板钒合金化镀锌强度塑性弯曲性能微观组织

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

档案资料的整理与编目

档案资料的整理与编目

1986年

作者：（加拿大）泰勒（taylor A.h.）黄坤坊译

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

内燃机车柴油机的废气排放及噪声控制

国外铁道机车与动车 1984年第10期 17-24页

作者： D.h.C.taylor 孙志信

1.引言人们越来越重视环境保护,柴油机是公认的污染源之一,但直到目前,大部分注意力还都放在汽车发动机上。近来许多国家巳注意到

关键词：柴油机压燃发动机中速机发动机结构涡轮增压噪声级进气温度高速机直喷燃油泵化工用泵油耗率里卡多消声器消音器废气排放噪声控制

RAYLEIGh.taylor INSTABILITIES BY OVERTURNING EXPERIMENTS IN TANK

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of hydrodynamics 2007年第3期19卷 303-308页

作者： LI Xi ChU Vincent h. Department of Ocean and Traffic Engineering Hohai University Nanjing 210098 China Deptartment of Civil Engineering and Applied Mechanics McGill University Montreal H3A 2K6 Canada

A laboratory study of the turbulence front initiated by the Rayleigh.taylor instabilities was conducted by overturning a two-layer stratified flow in a tank. Dye was introduced to the upper layer and the concentration of the dye was determined using a video imaging method. The mass center of the heavier upper layer moved continuously to a lower elevation because of the intrusion of the heavier fluid into the lower layer and the lighter fluid into the upper layer. The downward movement of the mass center was accurately determined from the dye concentration profile. It is concluded that the initial advancement of the mass center follows a quadratic relation with time and the final advancement obeys a linear relation with time.

关键词： Rayleigh.taylor instability stratified flow turbulent mixing video imaging technique overturning experiment

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

铂电阻温度计用微计算机控制仪器

国外计量 1984年第4期 23-26页

作者： h.R.taylor 王明冲

一、前言本文所述微计算机控制铂电阻温度计电阻比测试仪的特点是:能在0.52 s 内测得一个读数,自热、塞贝克效应和庇塔效应产生的系统误差均可消除,不确定度为8×10-6,测八个温度计的读数仪需4.16s,根据需要可按IPTS-68计算实际温度值,... 详细信息

一、前言本文所述微计算机控制铂电阻温度计电阻比测试仪的特点是:能在0.52 s 内测得一个读数,自热、塞贝克效应和庇塔效应产生的系统误差均可消除,不确定度为8×10-6,测八个温度计的读数仪需4.16s,根据需要可按IPTS-68计算实际温度值,还能测量自热系数。这种仪器利用微计算机可迅速取得几个连

关键词：铂电阻温度计模/数变换器多路调制器标准电阻器电学量单位基准器微计算机控制仪器