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109篇 您的检索式:作者名="John Morgan"
    题名 作者 年代 出处 被引量
1约翰斯顿岛附近海域铁锰结壳矿物学和地球化学研究显示文摘铁锰结壳存在两种不同的产状,一种是铁锰氧化物围绕“核心”生长形成的球状结壳,另一种是铁锰氧化物在基底岩石上生长形成的被状结壳。本文对R/VKaimikai-O-Kanaloa船1993年11月在约翰斯顿岛附近海域取得的铁锰结壳进行了矿物学和地球化学分析。该区铁锰结壳主要组成矿物为δ-MnO_2,Mn/Fe比值为2.02,富Co(0.881%),贫Cu(0.1%),稀土总量(ΣREE)1918.27ppm,具明显的Ce正异常(δCe=2.6),是典型的水成成因铁锰结壳。除Cu、Ni金属外,该区结壳中的稀土含量也已接近陆地稀土矿床的稀土品位。对球状结壳来说,表面光滑的上部壳层富δ-MnO_2,Mn、Co、Ni、Cu、P含量较高,而表面粗糙的下部壳层Si、Al含量相对较高。而且上部壳层的Ce正异常高于下部。对被状结壳而言,Co、Ni等金属含量由基岩向结壳表层增加。作者认为造成上述变化的主要原因是基底岩石和海水间的反应。R型因子分析得出四个主要因子:三价稀土元素因子,Mn、Fe、Co、Ti、K、Na、V、Mo、Cd、Ca、P因子,Ti、Cu、Cd、Zn因子,和Si、Al因子。分别代表了铁锰氧化物的水成成矿作用(因子?姚德 张丽洁 John Wiltshire Charles Morgan 崔汝勇 1996海洋地质与第四纪地质1996,16,1:19
2Spontaneous passage of common bile duct stones in jaundiced patients显示文摘BACKGROUND:Common bile duct(CBD)stones are known to pass spontaneously in a significant number of patients. This study investigated the rate of spontaneous CBD stones passage in a series of patients presenting with jaundice due to gallstones.The patients were managed surgically,allowing CBD intervention to be avoided in the event of spontaneous passage of CBD stones. METHOD:Retrospective analysis of patients presenting with jaundice due to CBD stones,and managed surgically with laparoscopic cholecystectomy and intra-operative cholangiogram with or without CBD exploration. RESULTS:The jaundice settled pre-operatively in 76/108 patients, and in 60/108 the CBD stones had passed spontaneously by the time of surgery.These 60 patients avoided any intervention to their CBD. CONCLUSIONS:CBD stones pass spontaneously in more than half of jaundiced patients.Surgical management(laparoscopic cholecystectomy and intra-operative cholangiogram,with willingness to perform CBD exploration if positive)allows the avoidance of CBD intervention in these patients.Valentina Lefemine Richard John Morgan 2011Hepatobiliary & Pancreatic Diseases International2011,10,2:10
3电力系统经济调度中遗传算法的比较研究显示文摘本文介绍了在电力经济调度中用于改善系统运行性能的遗传算法的某些修改。目的是试图找出供遗传算法使用的最佳运行点。为了改善运行性能,涉及到问题的两个阶段:即首先是选择一种适当的遗传策略,其次是为所选定的遗传策略对各种参数的值进行协调。这两个阶段均已在六机系统中经过试验,并按照在线及离线两种情况对试验结果进行了比较。全部研究工作清楚地表明,采用先进的遗传算子及优化选择参数值能使系统性能显著增强。Y.H. Song, University of Bath, UKF. li . R. Morgan , John Moores University, Liverpool, UKD. T. Y Cheng, National Grid Cornpany , UK 1995电网技术1995,19,3:4
4基于热刺激生物效应分析探讨艾灸起效原理(英文)显示文摘艾灸是许多中医疗法中的一种,其起效基础是艾灸燃烧产生的局部热刺激。本文通过回顾近几年的文献,总结局部热刺激产生的生物学效应,并进行分析,以期帮助理解艾灸的温通效应。本文阐述热刺激产生的局部、远部、全身效应,并且讨论其影响因素,以帮助理解艾灸的效应原理。黄凯裕 梁爽 陆露 Patrick John Morgan 张建斌 2016World Journal of Acupuncture-Moxibustion2016,26,3:3
5Moving fast, thinking fast:The relations of physical activity levels and bouts to neuroelectric indices of inhibitory control in preadolescents显示文摘Background:Structured vigorous physical activity(VPA)can improve cognitive control in children,but studies relating daily physical activity(PA)to cognitive control have yielded conflicting findings.While objectively measured daily PA summarizes all occurrences of PA within a registered period,a minimum duration of continuous PA is required for registration of a PA bout.Because brief bouts of high-intensity PA can account for a large proportion of children’s daily activity-related energy expenditure,this study assessed whether daily and bouted VPA were selectively related to cognitive control in preadolescents relative to other PA intensities.Methods:A total of 75 children between the ages of 8 and 10 years(49%girls)wore an ActiGraph wGT 3 X+on the hip for 7 days.The acceleration signal from the vertical axis was summarized over 1 s,5 s,and 15 s epochs.Daily and boutecd modercate PA,moderate-to-vigorous PA,and VPA were measured.PA bouts were expressed as the frequency and time spent in 2 different continuous PA bouts,one lasting≥10 s and the other lasting≥30 s at a given intensity.Inhibitory control was assessed using behavioral responses to a modified flanker task(mean reaction time(RTmean)and accuracy).Attentional resource allocation and co gnitive processing speed were measured using the amplitude and latency of the P3 component of event-related brain potentials,respectively.Associations between PA,behavioral indices of inhibitory control,P3 amplitude,and latency were assessed using hierarchical regression models.Results:Daily VPA was not related to RTmean or accuracy on either congruent or incongruent trials.In contrast,more time spent in VPA bouts lasting≥30 s predicted shorter P3 latency across epochs and flanker congruencies(allβ≤-0.24,all p≤0.04).The associations between shorter P3 latency and the time spent in moderate-to-vigorous PA bouts lasting≥30 s were less consistent and largely limited to congruent trials(congruent:β(-0.3 1,-0.34)).No significant associations were observed upon correction for false discovery rate.Conclusion:The pattern of uncorrected associations aligns with the dose-response literature and suggests that brief VPA bouts may yield the greatest benefits to cognitive processing speed in preadolescents.Future studies using measures of brain structure and function are needed to understand the mechanisms linking bouted VPA to neurocognitive function during childhood.Dominika M.Pindus Eric S.Drollette Lauren B.Raine Shih-Chun Kao Naiman Khan Daniel R.Westfall Morgan Hamill Rebecca Shorin Emily Calobrisi Dinesh John Arthur F.Kramer Charles H.Hillman 2019Journal of Sport and Health Science2019,8,4:2
6Des-γ-Carboxy Prothrombin and α-Fetoprotein as Biomarkers for the Early Detection of Hepatocellular Carcinoma显示文摘Anna S. Lok Richard K. Sterling James E. Everhart Elizabeth C. Wright John C. Hoefs Adrian M. Di Bisceglie Timothy R. Morgan Hae–Young Kim William M. Lee Herbert L. Bonkovsky Jules L. Dienstag 2010Gastroenterology2010,,2:2
7Assessment of erosion haz- ard with the USLE and GIS A ease study of the Upper Ewaso Nglro North basin of Kenya显示文摘Bancy M Mati Royston P C Morgan Francis N Gichuki John N Quinton Tim R Brewer Hans P l iniger 2000lnternation Journal of Applied Earth Ob- servation and Geoinformation2000,2,2:1
8Will MOOCs Transform Learning and Teaching in Higher Education?Engagement and Course Retention in On- line Learning provision 显示文摘Sara Isabella de Freitas John Morgan David Gibson 2015British Journal of Educational Technology2015,,46:1
9Finite Element Modeling of the Effect of Non-metallic inclusions in Metal Forming Processes显示文摘Ulrich T Riedel Wolfgang Bleck John E Morgan 1999Computational Materials Science1999,,16:1
10An Analysis of the War of Attrition and the All-Pay Auction显示文摘Vijay Krishna John Morgan 1997Journal of Economic Theory1997,,:1
11The promoter of the plant defensin gene PDF1.2 from Arabidopsis is systemically activated by fungal pathogens and responds to methyl jasmonate but not to salicylic acid显示文摘John M. Manners Iris A.M.A. Penninckx Katrien Vermaere Kemal Kazan Rebecca L. Brown Andrew Morgan Donald J. Maclean Mark D. Curtis Bruno P.A. Cammue Willem F. Broekaert 1998Plant Molecular Biology1998,,6:1
12Volatile lipid oxidation products of Wagyu and domestic breeds of beef显示文摘Boylston T D Morgan S A John K A 1996Journal of Agricultural and Food Chemistry of Food and Agriculture1996,44,4:1
13One size does not fit all: The emerging frontier in large-scale marine conservation显示文摘Robert J. Toonen T. ‘Aulani Wilhelm Sara M. Maxwell Daniel Wagner Brian W. Bowen Charles R.C. Sheppard Sue M. Taei Tukabu Teroroko Russell Moffitt Carlos F. Gaymer Lance Morgan Nai‘a Lewis Anne L.S. Sheppard John Parks Alan M. Friedlander 2013Marine Pollution Bulletin . 2013 (1-2)2013,,1:1
14Splenic artery and coronary vein occlusion for bleeding esophageal varices显示文摘Louis R. M. Guercio M.D. W. John B. Hodgson M.B. M.S. Jean C. Morgan M.B. B.S. Howard L. Berman M.D. Mahesh N. Kinkhabwalla M.D 1984World Journal of Surgery1984,,5:1
15Preparation and Certification of Re-Os dating reference materials:Molybdenite HLP and JDC显示文摘Du Andao Wu Shuqi Sun Dezhong Wang Shuxian Qu Wenjun Richard Markey Holly Stein John Morgan Dmitry Malinovskiy 2004Geostandard and Geoanalytical Research2004,28,1:1
16Temporal price dispersion: Evidence from an online consumer electronics market显示文摘Michael R. Baye John Morgan Patrick Scholten 2004Journal of Interactive Marketing2004,,4:1
17The Effect of Preservation Solutions for Storage of Liver Allografts on Transplant Outcomes: A Systematic Review and Meta-Analysis显示文摘John M. O?Callaghan Robert D. Morgan Simon R. Knight Peter J. Morris 2014Annals of Surgery2014,,1:1
18Comparison of the adsorption of N2 on Ru(109) and Ru(001)-a detailed look at the role of atomic step and terrace sites显示文摘Morgan Jr Gregg A Sorescu Dan C Yates Jr John T 2007Surface Science2007,601,:1
19Environmental risk factors for Lyme disease identified with geographic information systems显示文摘Gregory EG John BSS Morgan JM 1995Am J Public Health1995,85,:1
20Impact of the complement cascade on posttraumatic cartilage inflammation and degradation 显示文摘John T Stahel P F Morgan S J Schulze-Tanzil G 2007Histol Histopathol2007,22,7:1
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