检索结果-南通市图书馆

Multinuclear MR and MRI study of lithium-ion cells using a variable field magnet and a fixed frequency RF probe

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Magnetic Resonance letters 2024年第1期4卷 10-20页

作者： Andrés Ramírez Aguilera Florin Marica Kevin J.Sanders Md Al Raihan C.Adam Dyker Gillian R.Goward bruce *** UNB MRI Centre Department of PhysicsUniversity of New BrunswickFrederictonNew BrunswickE3B 5A3Canada Department of Chemistry McMaster UniversityHamiltonOntarioL8S 4L8Canada Department of Chemistry University of New BrunswickFrederictonNew BrunswickE3B 5A3Canada

An exploratory multinuclear magnetic resonance(MR)and magnetic resonance imaging(MRI)study was performed on lithium-ion battery cells with ^(7)li,^(19)F,and ^(1)H measurements.A variable field superconducting magnet with a fixed frequency parallel-plate radiofrequency(RF)probe was employed in the *** magnetic field was changed to set the resonance frequency of each nucleus to the fixed RF probe frequency of 33.7 *** cartridge-like lithium-ion cells,with graphite anodes and liNi_(0.5)Mn_(0.3)Co_(0.2)O_(2)(NMC)cathodes,were *** cell was pristine,and one was charged to a cell voltage of 4.2 *** results presented demonstrate the great potential of the variable field magnet approach in multinuclear measurement of lithium-ion *** methods open the door for developing faster and simpler methods for detecting,quantifying,and interpreting MR and MRI data from lithium-ion and other batteries.

关键词： Multinuclear MR/MRI Variable field magnet lithium-ion battery Parallel-plate rf probe

New insights into the vitamin D requirements during pregnancy

在线全文

学校读者我要写书评

暂无评论

Bone Research 2017年第3期5卷 161-176页

作者： bruce W Hollis Carol l Wagner Department of Pediatrics Darby Children's Research Institute Medical University of South Carolina

Pregnancy represents a dynamic period with physical and physiological changes in both the mother and her developing fetus. The dramatic 2-3 fold increase in the active hormone 1,25（OH）2D concentrations during the early weeks of pregnancy despite minimal increased calcium demands during that time of gestation and which are sustained throughout pregnancy in both the mother and fetus suggests an immunomodulatory role in preventing fetal rejection by the mother. While there have been numerous observational studies that support the premise of vitamin D＇s role in maintaining maternal and fetal well-being, until recently, there have been few randomized clinical trials with vitamin D supplementation. One has to exhibit caution, however, even with RCTs, whose results can be problematic when analyzed on an intent-to-treat basis and when there is high non-adherence to protocol （as if often the case）, thereby diluting the potential good or harm of a given treatment at higher doses. As such, a biomarker of a drug or in this case ＂vitamin＂ or pre-prohormone is better served. For these reasons, the effect of vitamin D therapies using the biomarker circulating 25（OH）D is a far better indicator of true ＂effect.＂ When pregnancy outcomes are analyzed using the biomarker 25（OH）D instead of treatment dose, there are notable differences in maternal and fetal outcomes across diverse racial/ethnic groups, with improved health in those women who attain a circulating 25（OH）D concentration of at least 100 nmol. l-1 （40 ng. ml-1）. Because ,an important issue is the timing or initiation of vitamin D treatment/supplementation, and given the potential effect of vitamin D on placental gene expression and its effects on inflammation within the placenta, it appears crucial to start vitamin D treatment before placentation （and trophoblast invasion）; however, this question remains unanswered. Additional work is needed to decipher the vitamin D requirements of pregnant women and the optimal timing of s

关键词： New insights into the vitamin D requirements during pregnancy

Propulsive matrix of a helical flagellum

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第11期23卷 51-56页

作者：张何朋刘斌 bruce Rodenborn Harry l.Swinney Department of Physics and Astronomy and Institute of Natural Sciences School of Natural Sciences University of California Department of Physics and Center for Nonlinear Dynamics University of Texas at Austin

We study the propulsion matrix of bacterial flagella numerically using slender body theory and the regularized Stokeslet method in a biologically relevant parameter regime. All three independent elements of the matrix are measured by computing propulsive force and torque generated by a rotating flagellum, and the drag force on a translating flagellum. Nu- merical results are compared with the predictions of resistive force theory, which is often used to interpret micro-organism propulsion. Neglecting hydrodynamic interactions between different parts of a flagellum in resistive force theory leads to both qualitative and quantitative discrepancies between the theoretical prediction of resistive force theory and the numerical results. We improve the original theory by empirically incorporating the effects of hydrodynamic interactions and propose new expressions for propulsive matrix elements that are accurate over the parameter regime explored.

关键词： low-Reynolds-number flows micro-organism dynamics bacterial swimming

在线全文

学校读者我要写书评

暂无评论

碳酸盐矿物稳定性的热力学特征

地质科学译丛 1994年第1期11卷 1-3页

作者： l.bruce Railsback 刘子忠 Department of Geology University of GeorgiaAthesGeorgia 30602

新提出的图解表明,碳酸盐矿物的结晶状况、稳定性及溶解度随阳离子半径而变化。阳离子半径≤1.00的碳酸盐矿物在三方晶系中结晶,而阳离子半径≥1.00的碳酸盐矿物在斜方晶系中结晶。Ca^(2+_的半径在六次配位中为1.00,故可形成两种相对可... 详细信息

新提出的图解表明,碳酸盐矿物的结晶状况、稳定性及溶解度随阳离子半径而变化。阳离子半径≤1.00的碳酸盐矿物在三方晶系中结晶,而阳离子半径≥1.00的碳酸盐矿物在斜方晶系中结晶。Ca^(2+_的半径在六次配位中为1.00,故可形成两种相对可溶的CaCO_3多型体。由于Mg^(2+)和Ca^(2+)的半径处于三方晶系碳酸盐域的最下限和最上限,因此形成了一些极易溶的天然碳酸盐。结果在多型变化和转化方面,碳酸盐岩石学就引发了许多令人感兴趣的问题。如果不是因为碳酸盐阳离子中Ca^(2+)的独特条件,上述现象就不会发生。同样,MgCO_3和CaCO_3的相对溶解度也是与阳离子半径一致的,有利于白云岩化的丰度,这是长期以来碳酸盐岩石学研究的另一有趣的重要领域。

关键词：碳酸盐矿物稳定性热力学

Adding Value to Crop Production Systems by Integrating Forage Cover Crop Grazing

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2024年第3期15卷 180-192页

作者： Robert B. Mitchell Daren D. Redfearn Kenneth P. Vogel Terry J. Klopfenstein Galen Erickson P. Stephen Baenziger bruce E. Anderson Mary E. Drewnoski Jay Parsons Steven D. Masterson Marty R. Schmer Virginia l. Jin USDA-ARS Wheat Sorghum and Forage Research Unit University of Nebraska-Lincoln Lincoln NE USA Department of Agronomy and Horticulture University of Nebraska-Lincoln Lincoln NE USA Department of Animal Science University of Nebraska-Lincoln Lincoln NE USA Department of Agricultural Economics University of Nebraska-Lincoln Lincoln NE USA USDA-ARS Agroecosystem Management Research Unit University of Nebraska-Lincoln Lincoln NE USA

In addition to their value as cereal grains, wheat (Triticum aestivum l.) and triticale (× Triticosecale Wittmack) are important cool-season annual forages and cover crops. Yearling steer (Bos taurus) performance was compared in the spring following autumn establishment as for age cover crops after soybean [Glycine max (l.) Merr.] grain harvest. Replicated pastures (0.4 ha) were no-till seeded in three consecutive years into soybean stubble in autumn, fertilized, and grazed the following spring near Ithaca, NE, USA. Each pasture (n = 3) was continuously stocked in spring with four yearling steers (380 ± 38 kg) for 17, 32, and 28 d in 2005, 2006, and 2007, respectively. In 2005, average daily gain (ADG) for steers grazing triticale exceeded the ADG for wheat by 0.31 kghd-1d-1. In 2006, wheat ADG exceeded that for triticale by 0.12 kghd-1d-1. In 2007, steers grazing wheat lost weight, while steers grazing triticale gained 0.20 kghd-1d-1. Based on the 3-year average animal gains valued at $1.32 kg-1, mean net return ($ ha-1 yr-1) was $62.15 for triticale and $22.55 for wheat. Since these grazed cover crops provide ecosystem services in addition to forage, grazing could be viewed as a mechanism for recovering costs and adds additional value to the system. Based on this 3-year grazing trial, triticale was superior to wheat and likely will provide the most stable beef yearling performance across years with variable weather for the western Cornbelt USA.

关键词： Cover crops Soybean Triticale Wheat

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

旅游潜艇业

海洋信息 1996年第11期11卷 1-6页

作者： l.bruce Jones 沈乃宏美国潜艇公司

1 前言近些年来,由于遥控潜水器(ROV)的大量涌现,科学研究和商业用载人潜水器的建造已急剧下降,而一种新型水下潜水器——旅游潜艇的建造数量已剧增。近10多年来,已建造约48艘专用旅游潜艇。

关键词：旅游潜艇潜水器发展史

Injury and illness in short-course triathletes:A systematic review

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2024年第2期13卷 172-185页

作者： Sara A.Guevara Melissa l.Crunkhorn Michael Drew Gordon Waddington Julien D.Périard Naroa Etxebarria liam A.Toohey Paula Charlton University of Canberra Research Institute for Sport and Exercise(UCRISE) BruceACT 2617Australia New South Wales Institute of Sport SydneyNSW 2127Australia Queensland Academy of Sport BrisbaneQLD 4111Australia Triathlon Australia Gold CoastQLD 4227Australia Australian Institute of Sport BruceACT 2617Australia

Background:Determining the incidence and prevalence of injury and illness in short-course triathletes would improve understanding of their etiologies and therefore assist in the development and implementation of prevention *** study synthesizes the existing evidence on the incidence and prevalence of injury and illness and summarizes reported injury or illness etiology and risk factors affecting short-course ***:This review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses *** reporting health problems(injury and illness)in triathletes(all sexes,ages,and experience levels)training and/or competing in short-course distances were *** electronic databases(Cochrane Central Register of Controlled Trials,MEDlINE,Embase,APA PsychINFO,Web of Science Core Collection,and SPORTDiscus)were *** of bias was independently assessed by 2 reviewers using the Newcastle-Ottawa Quality Assessment *** authors independently completed data ***:The search yielded 7998 studies,with 42 studies eligible for ***-three studies investigated injuries,24 studies investigated illnesses,and 5 studies investigated both injuries and *** injury incidence rate ranged 15.7-24.3 per 1000 athlete exposures,and the illness incidence rate ranged 1.8-13.1 per 1000 athlete *** and illness prevalence ranged between 2%-15%and 6%-84%,*** injuries reported occurred during running(45%-92%),and the most frequently reported illnesses affected the gastrointestinal(7%-70%),cardiovascular(14%-59%),and respiratory systems(5%-60%).Conclusion:The most frequently reported health problems in short-course triathletes were:overuse and lower limb injuries associated with running;gastrointestinal illnesses and altered cardiac function,primarily attributable to environmental factors;and respiratory illness mostly caused by infection.

关键词： Athlete illnesses Athletic injuries Epidemiology Triathlon

The acceleration of a high-charge electron bunch to 10 GeV in a 10-cm nanoparticle-assisted wakefield accelerator

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第1期9卷 15-24页

作者： Constantin Aniculaesei Thanh Ha Samuel Yoffe lance labun Stephen Milton Edward McCary Michael M.Spinks Hernan J.Quevedo Ou Z.labun Ritwik Sain Andrea Hannasch Rafal Zgadzaj Isabella Pagano Jose A.Franco-Altamirano Martin l.Ringuette Erhart Gaul Scott V.luedtke Ganesh Tiwari Bernhard Ersfeld Enrico Brunetti Hartmut Ruhl Todd Ditmire Sandra bruce Michael E.Donovan Michael C.Downer Dino A.Jaroszynski Bjorn Manuel Hegelich University of Texas at Austin AustinTexas 78712USA SUPA Department of Physics University of StrathclydeGlasgowScotland G4 ONGUnited Kingdom Tau Systems Inc.AustinTexas 78701USA lawrence livermore National laboratory LivermoreCalifornia 94550USA los Alamos National laboratory Los AlamosNew Mexico 87545USA Brookhaven National laboratory UptonNew York 11973USA ludwig-Maximilians-Universität MunichGermany

An intense laser pulse focused onto a plasma can excite nonlinear plasma *** appropriate conditions,electrons from the background plasma are trapped in the plasma wave and accelerated to ultra-relativistic *** scheme is called a laser wakefield *** this work,we present results from a laser wakefield acceleration experiment using a petawatt-class laser to excite the wakefields as well as nanoparticles to assist the injection of electrons into the accelerating phase of the *** find that a 10-cm-long,nanoparticle-assisted laser wakefield accelerator can generate 340 pC,10±1.86 GeV electron bunches with a 3.4 GeV rms convolved energy spread and a 0.9 mrad rms *** can also produce bunches with lower energies in the 4–6 GeV range.

关键词： acceleration nanoparticle charge

In memory of Perry l. McCarty, seminal founder of Environmental Biotechnology

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

Frontiers of Environmental Science & Engineering 2023年第10期17卷 171-173页

作者： bruce E.Rittmann Biodesign Swette Center for Environmental Biotechnology Arizona State UniversityTempeAZ 85287-5701USA

Perry *** passed away on June 4,at the age of *** was a revered leader in Environmental Engineering and *** *** passed away peacefully and with his family on June 4,*** was a world leader in Environmental Engineering,with special emphasis on Environmental Biotechnology,in which we form partnerships with microbial communities that provide services to make human society more sustainable.I was one of Perry’s ***,and we worked together on research,service,and publishing throughout my career.I have deep and personal knowledge of how Perry and his students developed the fundamental principles that have allowed Environmental Biotechnology to flourish and advance humans’sustainability.

关键词： peace allowed passed