检索结果-南通市图书馆

Science China(Technological Sciences) 2012年第5期55卷 1207-1216页

作者： ZHANG QingHe LIU RuiYuan YANG HuiGen HU HongQiao ZHANG BeiChen DUNLOP Malcolm lester Mark BOGDANOVA Yulia WALSH Andrew SOA Key Laboratoryfor Polar Science Polar Research Institute of ChinaShanghai 200136China Space Science Department Rutherford-Appleton LaboratoryChiltonDidcotUK Department of Physics and Astronomy University of LeicesterLeicesterUK Mullard Space Science Laboratory University College LondonDorkingSurreyUK

A number of backscatter power enhancement events with ＂equatorward-moving radar auroral forms＂ in the high-latitude ionosphere were observed by SuperDARN CUTLASS Finland radar when the IMF was northward during 09：00 -10：00 UT on 26 March 2004. These events were also associated with sunward flow enhancements at each location in the Northern Hemisphere which were shown in ionospheric convections measured by the SuperDARN radars. These are typical features of high-latitude （lobe） magnetic reconnections. The durations of the velocity enhancements imply that the evolution time of the lobe reconnec- tions is about 8-16 rain from their origin at the reconnection site to their addition to the magnetotall lobe again. In additional, the Double Star TC-1 spacecraft was moving from magnetosheath into magnetosphere, and crossing the magnetopause near the subsolar region during this interval, and observed typical low-latitude magnetic reconnection signatures. This infers that the dayside high- and low-latitude reconnections may occur simultaneously.

关键词： high-latitude magnetic reconnection equatorward-moving radar auroral form evolution time of the lobe reconnections

Understanding bottom-up continuous hydrothermal synthesis of nanoparticles using empirical measurement and computational simulation

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第11期9卷 3377-3387页

作者： Jose Sierra-Pallarest Thomas Huddle Juan Garcia-Serna Esther Alonso Fidel Mato Igor Shvets Olaf Luebben Maria Jose Cocero Edward lester Fluids Engineering Group Energy and Fluid Mechanics Engineering Department University of Valladolid Paseo del Cauce 59 47010 Valladolid Spain Advanced Materials Research Group the University of Nottingham University Park Nottingham NG7 2RD UK High Pressure Processes Group Department of Chemical Engineering and Environmental Technology University of Valladolid C/Prado de la Magdalena s/n 47011 Valladolid Spain School of Physics Trinity College Dublin College green Dublin 2 Ireland

Continuous hydrothermal synthesis was highlighted in a recent review as an enabling technology for the production of nanoparticles. In recent years, it has been shown to be a suitable reaction medium for the synthesis of a wide range of nanomaterials. Many single and complex nanomaterials such as metals, metal oxides, doped oxides, carbonates, sulfides, hydroxides, phosphates, and metal organic frameworks can be formed using continuous hydrothermal synthesis techniques. This work presents a methodology to characterize continuous hydrothermal flow systems both experimentally and numerically, and to determine the scalability of a counter current supercritical water reactor for the large scale production （〉1,000 T-year-1） of nanomaterials. Experiments were performed using a purpose-built continuous flow rig, featuring an injection loop on a metal salt feed line, which allowed the injection of a chromophoric tracer. At the system outlet, the tracer was detected using UV/Vis absorption, which could be used to measure the residence time distribution within the reactor volume. Computational fluid dynamics （CFD） calculations were also conducted using a modeled geometry to represent the experimental apparatus. The performance of the CFD model was tested against experimental data, verifying that the CFD model accurately predicted the nucleation and growth of the nanomaterials inside the reactor.

关键词： nanoparticle computational fluid dynamics synthesis supercritical inorganics

Investigating the Modulatory Role of Chronological and Biological Age on Performance Predictors in Youth Swimmers

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 Science in Sport and Exercise 2020年第4期2卷 349-358页

作者： M.A.McNarry L.lester J.Brown K.A.Mackintosh School of Sport and Exercise Sciences Swansea UniversityBay CampusSwansea SA18ENUK School of Human Science University of Western AustraliaPerth 6009Australia

Purpose The aim of this study was to determine the modulatory roles of biological maturity and age on the predictors of performance in youth swimmers and their stability over a six-month training *** In total,28 swimmers(10 pre-pubertal[6 boys],11.1±1.8 years;18 pubertal[8 boys],15.2±2.0 years old)and 26 untrained controls(15 pre-pubertal[10 boys],9.7±1.5 years;11 pubertal[6 boys],14.4±0.5 years old)were *** baseline,3-and 6-months,participants completed an incremental ramp cycle test,isometric handgrip strength test and countermovement jumps,with speed assessed as a measure of performance in *** component analysis(PCA)identified factors that described youth swimmers’physical profile,with linear mixed models subsequently used to determine their interaction with age and maturity on *** Aerobic fitness and upper body strength were significantly higher in the trained participants,irrespective of maturity status or *** key factors were identified through PCA(anthropometrics;strength;aerobic capacity;aerobic rate),accounting for 90%of the between parameter *** exerted a widespread influence on swimming performance predic-tors,influencing all four factors,whilst maturity only influenced the aerobic *** key age of divergence was 13 *** Overall,the present study found no evidence of a maturational threshold in the aerobic or strength-related response to training in *** influence of age on performance predictors suggests that utilising a single or select group of parameters to inform selection and/or talent identification throughout the dynamic processes of growth and maturation should be avoided.

关键词： Aerobic fitness Strength Maturity Pre-pubertal Pubertal Power

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

上海宝山钢铁公司新建4号板坯连铸机

钢铁 2006年第9期41卷 85-88页

作者： John lester Nick Stanley Carlo P.Piemonte 达涅利Davy Distington公司

宝钢新建4号板坯连铸机将成为先进的机械设备与动态自动控制系统完美结合的典范,将使设备性能和生产操作灵活性达到一个新的水平。新建铸机将能够浇铸包括超低碳钢,低、中、高碳钢,包晶钢和微合金钢在内的各种钢种,不论在产品质量,还是... 详细信息

宝钢新建4号板坯连铸机将成为先进的机械设备与动态自动控制系统完美结合的典范,将使设备性能和生产操作灵活性达到一个新的水平。新建铸机将能够浇铸包括超低碳钢,低、中、高碳钢,包晶钢和微合金钢在内的各种钢种,不论在产品质量,还是在生产能力方面,都将达到最好的水平。

关键词：板坯连铸机

Cronbach's a reliability, concurrent validity, and factorial structure of the Death Depression Scale in an Iranian hospital staff sample

在线全文

学校读者我要写书评

暂无评论

International Journal of Nursing Sciences 2017年第2期4卷 135-141页

作者： Mahboubeh Dadfar David lester School of Behavioral Sciences and Mental Health-Tehran Institute of Psychiatry International CampusIran University of Medical SciencesIran Psychology Program Stockton UniversityGallowayNJ 08205USA

Objective: Death depression is an important component in the process of death and dying. Death depression is the second element of death. Depression is one of the important features in death distress. The aim of this study was to explore the performance of the Farsi version of the Death Depression Scale with an Iranian convenience sample of nurses (n =106).Methods: Nurses were selected using a convenience sampling method, and completed the Death Depression Scale (DDS), Death Concern Scale (DCS), Collett-lester Fear of Death Scale (CLFDS), Reasons for Death Fear Scale (RDFS), Templer's Death Anxiety Scale (DAS), and Death Obsession Scale (DOS). Results: The results of exploratory factor analysis on DDS identified 4 factors (56.16%of variance). Factor 1 labeled"Death sadness", Factor 2 labeled"Death finality/end and Death dread/fear", Factor 3 labeled"Death despair and Death depression", and Factor 4 labeled"Death loneliness". Cronbach's a coefficient was 0.84, Spearman-Brown coefficient 0.85, and Guttman Split-Half coefficient 0.81 The DDS correlated 0.40 with the DCS, 0.39 with the CLFDS, 0.50 with the DAS, 0.35 with the RDFS, and 0.44 with the DOS, indicating good construct and criterion-related validity. Concurrent validity for the DDS with the other scales were significant. Conclusions: The DDS has good validity and reliability, and it can use in clinical and research settings.

关键词： Death Depression Scale(DDS) Reliability Validity Factorial structure Nurses Hospital

Mental health status in veterans residing in rural versus non-rural areas: results from the veterans’ health study

在线全文

学校读者我要写书评

暂无评论

Military Medical Research 2021年第1期8卷 79-89页

作者： Joseph J.Boscarino Charles R.Figley Richard E.Adams Thomas G.Urosevich H.lester Kirchner Joseph A.Boscarino Clinical Psychology Department William James CollegeNewtonMA 02459USA School of Social Work Tulane UniversityNew OrleansLA 70112USA Department of Sociology Kent State UniversityKentOH 44242USA Ophthalmology Service Geisinger ClinicMount PoconoPA 18344USA Department of Population Health Sciences Geisinger Clinic100 N.Academy Avenue44-00DanvillePA 17822USA

Background: The majority of Veterans Affair(VA) hospitals are in urban areas. We examined whether veterans residing in rural areas have lower mental health service use and poorer mental health ***: Veterans with at least 1 warzone deployment in central and northeastern Pennsylvania were randomly selected for an interview. Mental health status, including posttraumatic stress disorder(PTSD), major depression, alcohol abuse and mental health global severity, were assessed using structured interviews. Psychiatric service use was based on self-reported utilization in the past 12 months. Results were compared between veterans residing in rural and non-rural areas. Data were also analyzed using multivariate logistic regression to minimize the influence by confounding ***: A total of 1730 subjects(55% of the eligible veterans) responded to the survey and 1692 of them had complete geocode information. Those that did not have this information(n=38), were excluded from some analyses. Veterans residing in rural areas were older, more often of the white race, married, and experienced fewer stressful events. In comparison to those residing in non-rural areas, veterans residing in rural areas had lower global mental health severity scores;they also had fewer mental health visits. In multivariate logistic regression, rural residence was associated with lower service use, but not with PTSD, major depression, alcohol abuse, and global mental health severity score after adjusting confounding factors(e.g., age, gender, marital status and education).Conclusions: Rural residence is associated with lower mental health service use, but not with poor mental health in veterans with former warzone deployment, suggesting rural residence is possibly protective.

关键词： Veterans Rural Risk factors PTSD Alcohol abuse Depression Service use Census data

EXPLODING U.S. GRAIN DEMAND FOR AUTOMOTIVE FUEL THREATENS WORLD FOOD SECURITY AND POLITICAL STABILITY

在线全文

学校读者我要写书评

暂无评论

世界环境 2007年第1期 51-52页

作者： lester R.Brown

Now that the year's grain harvest is safely in the bin, it is time to take stock and look ahead. This year's harvest of 1,967 million tons is falling short of the estimated consumption of 2,040 million tons by some 73 million tons. This shortfall of nearly 4 percent is one of the largest on *** more sobering, in six of the last seven years world grain production has fallen short of use. As a result, world carryover stocks of grain have been drawn down to 57 days of consumption, the lowest level in 34 years. The last time they were this low wheat and rice prices doubled.

关键词：食品安全政治稳定性粮食需求量汽车燃料

CHINA REPLACING THE UNITED STATES AS WORLD’S LEADING CONSUMER

在线全文

学校读者我要写书评

暂无评论

世界环境 2006年第1期 59-60页

作者： lester R．Brown

Although the United States has long consumed the lion’s share of the world’s resources,this situation is changing fast as the Chinese economy surges ahead,overtaking the United States in the consumption of one

关键词： CHINA REPLACING THE UNITED STATES AS WORLD S LEADING CONSUMER than

细胞培养生物制品在不同研发阶段病毒清除的要求

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国新药杂志 2014年第8期23卷 962-967页

作者：陈琪张旻杨滨 Philip lester 美国基因泰克公司蛋白纯化开发部加州南旧金山94080

对纯化工艺的病毒清除验证是确保动物细胞表达的生物制品病毒安全性的重要手段之一。近年来生物制品工业已积累大量单抗纯化工艺中常用纯化步骤病毒清除的数据。基于对这些步骤病毒清除机理和工艺参数影响的深入研究,以及在不同单抗中... 详细信息

对纯化工艺的病毒清除验证是确保动物细胞表达的生物制品病毒安全性的重要手段之一。近年来生物制品工业已积累大量单抗纯化工艺中常用纯化步骤病毒清除的数据。基于对这些步骤病毒清除机理和工艺参数影响的深入研究,以及在不同单抗中病毒清除的高重复性,临床用产品可依照国际上病毒安全指导原则来使用模块验证的方法做病毒清除验证。

关键词：病毒清除单抗纯化工艺模块验证平台工艺

Auroral and Radar Signatures Associated with IMF Transients

在线全文

学校读者我要写书评

暂无评论

Auroral and Radar Signatures Associated with IMF Transients