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6039篇 您的检索式:作者名="Parsons"
    题名 作者 年代 出处 被引量
1Endoscopic pancreatic sphincterotomy:indications,outcome,and a safe stentless technique显示文摘Endoscopicpancreaticsphincterotomy:indications,outcome,andasafestentlesstechniquericElton,MD,DouglasA.Howel,MD,WilisG.Parsons...Eric Elton, MD, Douglas A. Howell, MD, Willis G. Parsons, MD, Tahir Qaseem, MD, Brian L. Hanson, MDPortland, MaineDivision of Gastroenterology, Maine Medical Center, Portland, Maine 1998World Journal of Gastroenterology1998,4,3:16
2Highly efficient GaAs solar cells by limiting light emission angle显示文摘In a conventional flat plate solar cell under direct sunlight,light is received from the solar disk,but is re-emitted isotropically.This isotropic emission corresponds to a significant entropy increase in the solar cell,with a corresponding drop in efficiency.Here,using a detailed balance model,we show that limiting the emission angle of a high-quality GaAs solar cell is a feasible route to achieving power conversion efficiencies above 38%with a single junction.The highest efficiencies are predicted for a thin,light trapping cell with an ideal back reflector,though the scheme is robust to a non-ideal back reflector.Comparison with a conventional planar cell geometry illustrates that limiting emission angle in a light trapping geometry not only allows for much thinner cells,but also for significantly higher overall efficiencies with an excellent rear reflector.Finally,we present ray-tracing and detailed balance analysis of two angular coupler designs,show that significant efficiency improvements are possible with these couplers,and demonstrate initial fabrication of one coupler design.Emily D Kosten Jackson H Atwater James Parsons Albert Polman Harry A Atwater 2013Light(Science & Applications)2013,2,1:9
3参与式渭南地震情景构建:中国地震风险对策的行动研究示范显示文摘中国政府层面自上而下的防震减灾管理卓有成效;但是,对于提升全社会的整体防震减灾能力而言,尚需推动基于此而又有民众与基层自下而上广泛参与的全社会治理模式。为发展这种模式积累经验,渭南市地震情景构建示范项目借助参与式行动研究范式,特别关注了中国防震减灾工作当前存在的以下2点广泛不足:一是社会民众与基层的自下而上办法薄弱,且与政府层面自上而下对策之间的相互衔接与促进不足;二是科学研究向实际减灾对策的转化不足,特别是针对自下而上办法的科学研究与应用转化不足。取得的主要进展有:1)基于广泛参与理念,通过'研究者'和'减灾实践者'、'相关者'、'当事人'2方面人员间的密切合作,共同诊断评估了渭南面临的主要地震灾害风险及隐患、共同提炼了针对性的减灾对策改进建议等,从而使情景构建所得的结果或认识更加可靠、所提对策建议更加符合当地实际需要;借助行动研究过程平台,尝试了风险评估、风险沟通和风险对策改进3大环节的无缝衔接与同步互动,促进了科学研究与实际应用的直接对接与就地转化。2)基于多尺度、多层面视角和同时为'政府'或'部门'与'基层'或'民众'两大类用户服务。在关注改进自上而下对策的同时,针对薄弱的自下而上办法,特别是就这两大对策途径间最广泛与最可持续的接口——宣传教育和家庭、学校、社区减灾,开展了大规模的专项调查分析,梳理了系列化的现今本底与改进方向。3)聚焦改善减灾宣教和促进风险沟通,编创了由'故事'引导的2版内容与形式均有显著差别的地震情景叙事读本:政府版和公众版,以期借助'故事'和艺术呈现'故事'带动人们更好地理解与应用情景构建结果和认识,借助'故事'演绎社会性灾害脆弱成分——'留守儿童家庭与贫困'之于灾害的强化与叠加效应,促进人们对地震灾害风险更加全面与深入的认识;在理性刻板科学中融入感性与人文艺术情怀,以引导共识与共鸣、改善减灾态度、培养减灾价值观,进而激发减灾行动和减灾参与意愿,特别是激励人们就相关问题进行长期思考和持续行动改善。以上3方面进展,从总体上实现了对中国防震减灾工作存在的前述2点广泛不足的有益研讨与部分弥补推动尝试。参与式渭南地震情景构建行动研究示范,对国内相关工作具有抛砖引玉的作用,也为国际同类工作积累了中国经验。苏桂武 Janise Rodgers 田青 齐文华 Philip England Timothy Sim John Young 王东明 李志强 冯希杰 孙磊 陈鲲 Emily So Barry Parsons 赵金礼 石建梁 袁志祥 Yue Cao 周旗 魏本勇 David Milledge Alexander Densmore 2020地震地质2020,42,6:6
4训练课RPE在短距离自行车训练负荷监控中的应用显示文摘目的:采用训练课RPE对自行车短距离项目场地专项、素质力量和公路有氧训练课的负荷水平进行监测,比较不同水平、不同性别运动员的评分差异。方法:上海自行车队短组运动员8名,其中男子6名,女子2名。赛前4周共完成16节场地专项训练课、8节素质力量训练课和7节有氧训练课。采用Borg的11分量表对运动员单节训练课的自感劳累水平进行评分,训练课RPE由RPE乘以训练课时间进行计算,分别统计单日及每周训练课RPE(sRPE)总和。采用Pearson相关对单日sRPE与次日晨尿PH和SG的相关性进行检验。结果:总sRPE在赛前4周逐渐下降,场地专项和素质力量训练sRPE分别在第3周(W3)和第2周(W2)达到较高水平,4周期间有氧训练sRPE维持在较低水平;后两周3组运动员sRPE总体上表现出E-Female>N-Male>E-Male的变化趋势;仅女运动员的尿比重(SG)与sRPE存在低度相关,其它指标均未见显著的相关关系。结论:训练课RPE是评价自行车短距离项目训练内部负荷的有效指标,但会受运动员不同运动水平的影响。马国强 Bretan Ross Parsons 李之俊 蔡怀敬 张瑶 2014体育科研2014,35,5:6
5Effects of Mn content on recrystallization resistance of AA6082 aluminum alloys during post-deformation annealing显示文摘The microstructural evolutions under as-homogenized and as-deformed conditions and after the postdeformation annealing of AA6082 aluminum alloys with different Mn content(0.05 wt.%-1 wt.%)were studied by optical,scanning electron,and transmission electron microscopies.The results showed that the presence of a large amount ofα-Al(Mn,Fe)Si dispersoids induced by Mn addition significantly improved the recrystallization resistance.In the base alloy free of Mn,static recrystallization occurred after 2 h of annealing,and grain growth commenced after 4 h of annealing,whereas in Mn-containing alloys,the recovered grain structure was well-retained after even 8 h of annealing.The alloy with 0.5%Mn exhibited the best recrystallization resistance,and a further increase of the Mn levels to 1%resulted in a gradual reduction of the recrystallization resistance,the reason for which was that recrystallization occurred only in the dispersoid-free zones(DFZs)and the increased DFZ fraction with Mn content led to an increase in the recrystallization fraction.The variation in the dispersoid number density and a coarsening of dispersoids during annealing have a limited influence on the static recrystallization in Mn-containing alloys.Xiaoming Qian Nick Parson X.-Grant Chen 2020Journal of Materials Science & Technology2020,52,17:6
6冲刷作用下砂土地层中桩的侧向力学性质分析显示文摘[目的]冲刷是在水流以及波浪作用下土体流失的一个过程,它通常发生在桥梁、港口码头、以及海岸平台等结构的基础周围,造成基础的承载力下降,危及上部结构的安全。目前在分析桩的侧向力学行为时,只考虑了冲刷深度对桩的侧向承载力的影响,而忽略了冲刷形成的冲刷孔的影响。事实上,冲刷孔的几何形状不仅包括冲刷深度、还包括了冲刷孔的宽度以及冲刷孔的坡度。目前,工程设计中广泛采用的侧向桩分析方法,即p-y曲线方法无法考虑冲刷孔三维几何形状对桩的侧向力学性质的影响。[方法]针对这个问题,文章提出了一种修正的p-y曲线方法以用于分析砂土地层中桩在冲刷作用下的侧向力学响应。[结果]该方法改进了基于锲形体破坏模型的Reese p-y曲线法,从而能考虑冲刷孔三维几何形状的影响。将计算得到的结果与三维有限差分数值分析的结果进行了比较,验证该修正方法的可靠性。[结论]计算结果表明:在冲刷孔的几何形状参数里,冲刷深度对桩的侧向力学性质的影响最大,其次是冲刷孔的宽度与坡度。忽略冲刷孔几何形状的影响,桩在地面位置的侧向位移会增加49%~68%。林城 韩杰 Caroline BENNETT Robert PARSONS 2018南方能源建设2018,5,2:5
7戒烟对早期肺癌患者预后的影响:观察性研究的系统回顾和荟萃分析显示文摘目的 系统分析戒烟对原发肺部肿瘤患者预后影响的试验证据。 设计 采用荟萃分析方法对研究结果进行系统分析。 数据来源 检索数据库CINAHL(1981年开始),Embase(1980年开始),Medline(1966年开始),Web of Science(1966年开始)以及CENTRAL(1977年开始),截止日期均为2008年12月,选取相关研究文献,并包括其参考文献。A Parsons A Daley P Aveyard 张黎(译) 代华平(校) 2010英国医学杂志中文版2010,13,4:5
8RFP-mediated ubiquitination of PTEN modulates its effect on AKT activation显示文摘PTEN 肿瘤 suppressor 是在调整 phosphatidylinositol-3-kinase (PI3K ) 有一个中央角色的类脂化合物磷酸酶信号 transduction 串联。不过, PTEN 活动被在房间调整的机制需要进一步的说明。尽管以前的研究证明了 PTEN 的 ubiquitination 能调制它的稳定性和 subcellular 本地化,在 PTEN 功能的最批评的方面的 ubiquitination 的角色,它的磷酸酶活动,充分没被探讨。这里,我们识别 PTEN 的新奇 E3 ubiquitin ligase,沤手指蛋白质(RFP ) ,那能支持 PTEN 的不正常的 polyubiquitinations。这些 ubiquitinations 不导致 PTEN 不稳定性或本地化,但是相当显著地禁止 PTEN 磷酸酶活动因此调制它的能力调整 PI3K 信号 transduction 串联。确实, RFP overexpression 在 AKT 激活上减轻调停 PTEN 的禁止的效果;相反,调停 RNAi 内长的 RFP 击倒提高 PTEN 的能力压制 AKT 激活。而且, PTEN 的调停 RFP 的 ubiquitination 禁止小道表示的 PTEN 依赖的激活并且也压制它的能力导致 apoptosis。我们的调查结果在控制 PTEN 表明调停 RFP 的 ubiquitination 的一个关键角色活动。James T Lee Jing Shan Jiayun Zhong Muyang Li Brenda Zhou Amanda Zhou Ramon Parsons Wei Gu 2013Cell Research2013,23,4:5
9Implementation of regional Acute Stroke Care Map increases thrombolysis rates for acute ischaemic stroke in Chinese urban area in only 3 months显示文摘Background The rate of intravenous thrombolysis for acute ischaemic stroke remains low in China.We investigated whether the implementation of a citywide Acute Stroke Care Map(ASCaM)is associated with an improvement of acute stroke care quality in a Chinese urban area.Methods The ASCaM comprises 10 improvement strategies and has been implemented through a network consisting of 20 tertiary hospitals.We identified 7827 patients with ischaemic stroke admitted from April to October 2017,and 506 patients underwent thrombolysis were finally included for analysis.Results Compared with‘pre-ASCaM period’,we observed an increased rate of administration of tissue plasminogen activator within 4.5 hours(65.4% vs 54.5%;adjusted OR,1.724;95% CI 1.21 to 2.45;p=0.003)during‘ASCaM period’.In multivariate analysis models,‘ASCaM period’was associated with a significant reduction in onset-to door time(114.1±55.7 vs 135.7±58.4 min,p=0.0002)and onset-to needle time(ONT)(169.2±58.1 vs 195.6±59.3 min,p<0.0001).Yet no change was found in door-to needle time.Clinical outcomes such as symptomatic intracranial haemorrhage,favourable functional outcome(modified Rankin Scale≤2)and in-hospital mortality remained unchanged.Conclusion The implementation of ASCaM was significantly associated with increased rates of intravenous thrombolysis and shorter ONT.The ASCaM may,in proof-of principle,serve as a model to reduce treatment delay and increase thrombolysis rates in Chinese urban areas and possibly other highly populated Asian regions.Yi Sui Jianfeng Luo Chunyao Dong Liqiang Zheng Weijin Zhao Yao Zhang Ying Xian Huaguang Zheng Bernard Yan Mark Parsons Li Ren Ying Xiao Haoyue Zhu Lijie Ren Qi Fang Yi Yang Weidong Liu Bing Xu 2021Stroke & Vascular Neurology2021,6,1:4
10The penile tourniquet显示文摘止血带通常在阴茎外科被使用完成一个不流血的操作领域或 intraoperatively 产生人工的勃起。几种技术被描述了,但是有数据的少量和指南的缺乏指导他们的安全使用。在阴茎外科,它是是主要担心的止血带使用的本地而非全身的效果。止血带时间应该被坚守最小,当可得到的有限数据建议那灌注,损害能甚至在 ischaemia 的短经期以后发生。象糖尿病患者和 arteriopaths 那样的高风险组在特别风险。进一步的研究被需要决定安全止血带时间和压力。Brian A Parsons Odunayo Kalejaiye Mustafa Mohammed Raj A Persad 2013Asian Journal of Andrology2013,15,3:4
11Intensive blood pressure reduction in acute cerebral haemorrhage trial (INTERACT): a randomised pilot trial显示文摘Craig S Anderson Yining Huang Ji Guang Wang Hisatomi Arima Bruce Neal Bin Peng Emma Heeley Christian Skulina Mark W Parsons Jong Sung Kim Qing Ling Tao Yue Chun Li Jian Dong Jiang Li Wen Tai Jin Li Zhang En Xu Yan Cheng Stephane Heritier Lewis B Morgenste 2008Lancet Neurology2008,,5:4
12Regulation of the homeostasis of hepatic endoplasmic reticulum and cytochrome P450 enzymes by autophagy显示文摘The endoplasmic reticulum(ER)is an intracellular organelle consisting of a continuous network of membranes.In the liver,the ER is highly active in protein modification,lipid metabolism,and xenobiotic detoxification.Maintaining these complicated processes requires elaborate control of the ER lumen environment as well as the ER volume.Increasing evidence suggests that autophagy plays a critical role in regulating the homeostasis of hepatic ER contents and levels of cytochrome P450(CYP)enzymes via selective ER-phagy.This review will provide an overview of ER-phagy,summarizing the possible roles of recently identified ER-phagy receptor proteins in regulating the homeostasis of hepatic ER and CYP enzymes as well as outlining the various implications of ER-phagy in ER-related liver diseases.Xiaowen Ma Clayre Parson Wen-Xing Ding 2018Liver Research2018,2,3:3
13Outcomes after percutaneous reduction and fixation of proximal humeral fractures显示文摘Jay D. Keener Brad O. Parsons Evan L. Flatow Kenneth Rogers Gerald R. Williams Leesa M. Galatz 2007Journal of Shoulder and Elbow Surgery2007,,3:3
14New Gasoline Passenger Car Engine Oil Performance Category显示文摘This paper primarily focuses on the development of the International Lubricant Standardization & Approval Committee (ILSAC) GF-5 passenger car engine oil category in North America and Japan including key technical performance requirements. New ILSAC GF-5 is scheduled to be introduced during the 3rd quarter of 2010 and will supersede ILSAC GF-4 and previous categories. It will also be backward compatible and will provide improved performance relative to GF-4 in many respects. At the same time, when GF-5 is introduced, it is anticipated that API SN will also be introduced as a new performance category to supersede the current category, API SM.Hiroshi Watanabe Gary M Parsons Trevor Miller 2009润滑油2009,24,6:3
15Secondary angiodysplasia-associated gastrointestinal bleeding in end-stage renal disease: Results from the nationwide inpatient sample显示文摘BACKGROUND Chronic kidney disease is associated with angiodysplasia of gastrointestinal tract leading to increased risk of gastrointestinal bleeding.AIM To determine the nationwide prevalence,trends,predictors and resource utilization of angiodysplasia-associated gastrointestinal bleeding in end-stage renal disease hospitalizations.METHODS The Nationwide Inpatient Sample database from 2009 to 2014,was utilized to conduct a retrospective study on patients with angiodysplasia associatedgastrointestinal bleeding and end-stage renal disease.Hospitalizations with endstage renal disease were included in the Nationwide Inpatient Sample database and a subset of hospitalizations with end-stage renal disease and angiodysplasiaassociated gastrointestinal bleeding were identified with International Classification of Diseases,9th revision,Clinical Modification codes for both endstage renal disease(585.6)and angiodysplasia(569.85,537.83).RESULTS The prevalence of angiodysplasia-associated gastrointestinal bleeding was 0.45%(n=24709)among all end-stage renal disease patients(n=5505252)that were hospitalized.Multivariate analysis indicated that the following were significant factors associated with higher odds of angiodysplasia associated-gastrointestinal bleeding in end-stage renal disease patients:an increasing trend from 2009-2014(P<0.01),increasing age(P<0.0001);African American race(P=0.0206);increasing Charlson-Deyo Comorbidity Index(P<0.01);hypertension(P<0.0001);and tobacco use(P<0.0001).Diabetes mellitus(P<0.0001)was associated with lower odds of angiodysplasia associated-gastrointestinal bleeding in end-stage renal disease patients.In comparison with urban teaching hospitals,rural and urban nonteaching hospitals were associated with decreased odds of angiodysplasia associated-gastrointestinal hemorrhage.CONCLUSION Angiodysplasia-associated gastrointestinal bleeding in end-stage renal disease patients showed an increasing trend from 2009-2014.Advanced age,African American race,overall high comorbidities,hypertension and smoking were significant factors for angiodysplasia-associated gastrointestinal bleeding in bleeding in these patients.Tooba Tariq Patrick Karabon Furqan B Irfan Sachin Goyal Matthew Masaru Mayeda Austin Parsons Stephanie Judd Murray Ehrinpreis 2019World Journal of Gastrointestinal Endoscopy2019,11,10:3
16Hydrophilic surface modification of PDMS for droplet microfluidics using a simple,quick,and robust method via PVA deposition显示文摘Polydimethylsiloxane(PDMS)is a dominant material in the fabrication of microfluidic devices to generate water-in-oil droplets,particularly lipid-stabilized droplets,because of its highly hydrophobic nature.However,its key property of hydrophobicity has hindered its use in the microfluidic generation of oil-in-water droplets,which requires channels to have hydrophilic surface properties.In this article,we developed,optimized,and characterized a method to produce PDMS with a hydrophilic surface via the deposition of polyvinyl alcohol following plasma treatment and demonstrated its suitability for droplet generation.The proposed method is simple,quick,effective,and low cost and is versatile with respect to surfactants,with droplets being successfully generated using both anionic surfactants and more biologically relevant phospholipids.This method also allows the device to be selectively patterned with both hydrophilic and hydrophobic regions,leading to the generation of double emulsions and inverted double emulsions.Tatiana Trantidou Yuval Elani Edward Parsons Oscar Ces 2017Microsystems & Nanoengineering2017,3,1:3
17赖氨酸在猪禽营养中的作用显示文摘赖氨酸是动物最重要的必需氨基酸之一。因具有二个氨基,其中一个氨基连接在ε-碳原子上,故表现为碱性氨基酸并具备某些特殊性质,为猪的第一限制性氨基酸,家禽的第二限制性氨基酸。当饲料中添加足够量的赖氨酸可适当降低饲料蛋白质水平;有利于体内蛋白质转化为较多的肌肉蛋白,提高畜禽胴体瘦肉率和屠宰率;与精氨酸之间存在着拮抗作用,比例适当时(赖氨酸不得高于精氨酸20%)畜禽能达到最佳生产性能;可利用率主要受到饲料抗营养因子和加工方式的影响。金邦荃 Carl Parson 1994国外畜牧学(饲料)1994,,4:3
18Effects of Early Intensive Blood Pressure-Lowering Treatment on the Growth of Hematoma and Perihematomal Edema in Acute Intracerebral Hemorrhage: The Intensive Blood Pressure Reduction in Acute Cerebral Haemorrhage Trial (INTERACT)显示文摘Craig S. Anderson Yining Huang Hisatomi Arima Emma Heeley Christian Skulina Mark W. Parsons Bin Peng Qiang Li Steve Su Qing Ling Tao Yue Chun Li Jian Dong Jiang Li Wen Tai Jin Li Zhang En Xu Yan Cheng Lewis B. Morgenstern John Chalmers Ji Guang Wang 2010Stroke2010,,2:3
19Vocal repertoire of the New Zealand kea parrot Nestor notabilis显示文摘Raoul SCHWING Stuart PARSONS Ximena J. NELSON 2012Current Zoology2012,58,5:2
20TEEATMENT OF CARCINOMA OF THE AMPULLA OF VATER显示文摘ALLEN O. WHIPPLE WILLIAM BARCLAY PARSONS CLINTON R. MULLINS 1935Annals of Surgery1935,,4:2
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