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219篇 您的检索式:作者名="R.R."
    题名 作者 年代 出处 被引量
1循证指南:弥散和灌注MRI在急性缺血性卒中诊断中的作用美国神经病学学会治疗和技术评价委员会的报告显示文摘目的 评价弥散加权成像(diffusion-weighted imaging,DWI)和灌注加权成像(perfusionweighted imaging PWI)在急性缺血性卒中患者诊断中应用的证据.方法 对1966年至2008年1月期间有关DWI和PWI诊断和预后价值的文献进行系统分析.结果和推荐 对于发病12 h内的急性缺血性卒中的诊断,DWI已被确认为有效的评价手段,且其诊断价值应高于非增强CT.为了最准确地诊断急性缺血性卒中,应进行DWI(A级推荐);然而,在疑似急性卒中患者的总体样本中,DWI诊断缺血性卒中的敏感性并不完美.DWI诊断脑出血的准确性不在本指南的范围之内.根据Ⅱ级和Ⅲ级证据,基线DWI体积可预测前循环卒中的基线卒中严重程度(B级推荐),但不能预测椎基底动脉系统卒中的基线卒中严重程度(C级推荐).基线DWI病变体积可预测(最终)梗死体积(B级推荐),并且有可能预测早期和远期临床转归(C级推荐).与DWI相比,基线PWI体积预测基线卒中严重程度的价值较小(C级推荐).尚无足够的证据支持或反对PWI在急性缺血性卒中诊断中的价值(U级推荐).P.D. Schellinger R.N. Bryan L.R. Caplan J.A. Detre R.R. Edelman C. Jaigobin C.S. Kidwell J.P. Mohr M. Sloan A.G. Sorensen S. Warach 章娟娟(译) 王国颖(译) 汪凯(译) 2010国际脑血管病杂志2010,18,11:38
2硫化矿物浮选捕收剂实践评述显示文摘本文从多方面评述了硫化矿物捕收剂在工业上的应用。首先列举了捕收剂的化学结构。介绍了一些主要捕收剂 (黄药、黑药和一硫代氨基甲酸盐 )和特殊捕收剂的性质。指出了矿物电化学敏感性在捕收剂选择时的作用。特别是 ,叙述了具有天然无捕收剂可浮性硫化矿物在应用不溶于水的带电的捕收剂时具有的很好可浮性。浮选给矿粒度影响矿物浮选速度。研究表明 ,随捕收剂用量增大 ,粗矿粒的浮选速度比较快 ,而细矿粒浮选速度开始迅速降低 ,这样就产生了自补偿作用。同时还讨论了在硫化矿浮选实践中混合起泡剂的作用。用分子量范围大的起泡剂可浮选粗矿粒 ,与用窄分子量起泡剂时增加捕收剂用量相比 。R.R.克里姆帕尔 王皓 2001国外金属矿选矿2001,38,9:11
3多民族人群中卵圆孔未闭与缺血性卒中的发生风险显示文摘目的:拟评价北曼哈顿多民族的前瞻性队列中卵圆孔未闭(PFO)引起缺血性卒中的风险。背景:PFO被认为与缺血性卒中风险增加相关,证据主要来自病例对照研究。在普通人群中,实际的PFO相关性卒中风险仍不明确。方法:研究对象为来自北曼哈顿研究(NOMAS)中1100例年龄〉39岁(平均68.7±10.0岁)的无卒中受试者,利用造影剂注射经胸二维超声心动图检查评估基线时的PFO。同时记录房间隔动脉瘤(ASA)。受试者接受每年随访。在校正已知的卒中危险因素后,评价PFO/ASA相关的卒中风险。Di Tullio M.R. Sacco R.L. Sciacca R.R. 韩瑞娟 2007世界核心医学期刊文摘(心脏病学分册)2007,3,7:11
4The influence on gear surface properties using shot peening with a bimodal media size distribution显示文摘R.R. Rego J.O. Gomes A.M. Barros 2013Journal of Materials Processing Tech2013,,12:3
5头颈部恶性肿瘤术后放疗的指征显示文摘近十年来。术后放疗已成为头颈部恶性肿瘤综合治疗重要的组成部分,提高了肿瘤的局部控制率和生存率。头颈部恶性肿瘤术后放疗的指征,有些较明确,有些则需要探讨。为了总结经验,使其更合理和完善。王中和 R.R.米列奥 1991实用口腔医学杂志1991,7,4:3
6出生前反复暴露于皮质激素的新生儿的呼吸窘迫综合征:一项随机化对照试验显示文摘Background: The efficacy and safety of repeat doses ofprenatal corticosteroids remains uncertain. Our aim was to establish whether repeat prenatal corticosteroids given to women at risk of preterm birth can reduce neonatal morbidity without harm. Methods: In this hospital-basedstudy, 982 women who remained at risk of preterm birth at less than 32 weeks’ gestation, 7 or more days after receiving a first course of prenatal corticosteroids,were randomly assigned to receive a repeat intramuscular dose of either 11.4 mg betamethasone (as Celestone Chronodose), or saline placebo. This was repeated every week the woman remained undelivered, at less than 32 weeks’ gestation, and at risk of preterm birth. Primary outcomes were occurrence and severity of neonatal respiratory distress syndrome, use and duration of oxygen and mechanical ventilation, and weight, length, and head circumference at birth and hospital discharge. Statistical analyses were on an intention to treat basis. This study is registered as an International Standard Randomised Controlled Trial, number ISRCTN48656428. Findings:Fewer babies exposed to repeat corticosteroids had respiratory distress syndrome (33%vs 41%; relative risk 0.82,95%CI 0.71-0.95, P=0.01) and fewer had severe lung disease(12%vs 20%; relative risk 0.60, 95%CI 0.46-0.79,P=0.0003) than those in the placebo group. In keeping with these benefits, babies exposed to repeat corticosteroids needed less oxygen therapy (P=0.03), and shorter duration of mechanical ventilation (P=0.01). Mean weight,length, and head circumference at birth and hospital discharge did not differ between treatment groups. Z-scores for weight (P=0.04) and head circumference (P=0.03) at birth were lower in the babies who received repeat corticosteroids although at the time of hospital discharge Z-scores did not differ between treatment groups (P=0.29 for weight, P=0.48 for head circumference). Interpretation:Exposure to repeat doses of antenatal corticosteroids reduces neonatal morbidity. Pending long-term outcome results, the short-term benefits for the babies in our study support the use of repeat doses of corticosteroids in women who remain at risk of very preterm birth 7 or more days after an initial course.Crowther C.A. Haslam R.R. Hiller J.E. 张振 2006世界核心医学期刊文摘(儿科学分册)2006,0,11:2
7First results from the CMD-3 Detector at the VEPP-2000 Collider显示文摘R.R. Akhmetshin A.V. Anisyonkov S.A. Ahokhin V.M. Aulchenko V.S. Banzarov L.M. Barkov N.S. Bashtovoy D.E. Berkaev A.E. Bondar A.V. Bragin S.I. Eidelman D.A. Epifanov L.B. Epshteyn G.V. Fedotovich S.E. Gayazov A.A. Grebenuk D.N. Grigoriev E.N. Gromov F.V. 2012Nuclear Physics B (Proceedings Supplements)2012,,:2
8用以改善浮选指标的几种新型捕收剂显示文摘本文简要介绍了目前正投入工业应用的4类新型浮选捕收剂及其化学基础,并列举若干浮选实例以例证这4类捕收剂的较重要的应用特性。通过进一步的试验,将更清楚地看到这些捕收剂给浮选作业在技术和经济两方面带来的效益。R.R.金倍尔 徐灿 1994国外金属矿选矿1994,31,4:2
9An overview on the use of titanium in the aerospace industry显示文摘R.R. Boyer 1996Materials Science & Engineering A1996,,1:2
10中心性浆液性脉络膜视网膜病变中心凹光感受器层和视力下降Piccolino F.C. De La Longrais R.R. Ravera G. 陈立军 2005世界核心医学期刊文摘(眼科学分册)2005,0,6:2
11Comparison of magnetically controlled reactor (MCR) and thyristor controlled reactor (TCR) from harmonics point of view显示文摘R.R. Karymov M. Ebadian 2006International Journal of Electrical Power and Energy Systems2006,,3:2
12HITEMP, the high-temperature molecular spectroscopic database显示文摘L.S. Rothman I.E. Gordon R.J. Barber H. Dothe R.R. Gamache A. Goldman V.I. Perevalov S.A. Tashkun J. Tennyson 2010Journal of Quantitative Spectroscopy and Radiative Transfer2010,,15:2
13Eco-industrial park initiatives in the USA and the Netherlands: first lessons显示文摘R.R. Heeres W.J.V. Vermeulen F.B. de Walle 2004Journal of Cleaner Production2004,,8:2
14Effect of nitrogen ion-implantation on the tribological properties and hardness of TiN films显示文摘R.R. Manory C.L. Li C. Fountzoulas J.D. Demaree J.K. Hirvonen R. Nowak 1998Materials Science & Engineering A1998,,1:2
15Anti-diabetic effect on alloxanized and normoglycemic rats and some pharmacological evaluations of Tournefortia hartwegiana显示文摘R.R. Ortiz-Andrade V. Rodríguez-López M.L. Gardu?o-Ramírez P. Castillo-Espa?a S. Estrada-Soto 2005Journal of Ethnopharmacology2005,,1:2
16The HITRAN 2008 molecular spectroscopic database显示文摘L.S. Rothman I.E. Gordon A. Barbe D.Chris Benner P.F. Bernath M. Birk V. Boudon L.R. Brown A. Campargue J.-P. Champion K. Chance L.H. Coudert V. Dana V.M. Devi S. Fally J.-M. Flaud R.R. Gamache A. Goldman D. Jacquemart I. Kleiner N. Lacome W.J. Lafferty J 2009Journal of Quantitative Spectroscopy and Radiative Transfer2009,,9:2
17Reproductive outcomes of patients undergoing radical trachelectomy for early-stage cervical cancer显示文摘C.H. Kim N.R. Abu-Rustum D.S. Chi G.J. Gardner M.M. Leitao J. Carter R.R. Barakat Y. Sonoda 2012Gynecologic Oncology2012,,3:2
18OARSI guidelines for the non-surgical management of knee osteoarthritis显示文摘T.E. McAlindon R.R. Bannuru M.C. Sullivan N.K. Arden F. Berenbaum S.M. Bierma-Zeinstra G.A. Hawker Y. Henrotin D.J. Hunter H. Kawaguchi K. Kwoh S. Lohmander F. Rannou E.M. Roos M. Underwood 2014Osteoarthritis and Cartilage2014,,:2
19用胃壁标本评估中国狍和欧洲狍(Capreolus capreolus)的营养状况(英文)显示文摘通过测量12只中国狍(Capreolus capreolus bedfordi)瘤胃壁粘膜标本,作者测定了12只狍胃壁粘膜的表面扩张系数(SEF)。结果表明,中国狍胃壁粘膜的表面扩张系数与德国和波兰狍基本一致,说明中国狍的营养状况和生境的食物条件良好。李文军 R.R.霍夫曼 1991动物学报1991,37,2:2
20An overview on the use of titanium in the aerospace industry显示文摘R.R. Boyer 1996Materials Science & Engineering A1996,,1:2
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