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4055篇 您的检索式:作者名="SilverS"
    题名 作者 年代 出处 被引量
1青藏高原东部上地幔各向异性及相关的壳幔耦合型式显示文摘对国家数字地震台网和云南、四川、甘肃、青海区域数字地震台网,以及布设在川、滇、藏地区的宽频带流动地震台网共116个台站所记录的远震SKS波形资料作偏振分析,采用叠加分析方法求得每一个台站的SKS快波偏振方向和快慢波的时间延迟,获得青藏高原东部及其邻近地区的上地幔各向异性图像.将该地区全球定位系统(GPS)的观测结果与上地幔各向异性分布相结合作地壳一地幔耦合变形的分析,研究表明青藏高原内部和高原外部的云南地区具有不同的壳幔变形特征,在高原的东缘地区(大致位于川滇西部的26°-27°N之间)存在一个壳幔变形的横向过渡带.过渡带以南地区的快波偏振方向从滇西南的S60°-70°E逐渐转变到滇东南的近东西向,以北的滇西北部和川西南部,快波偏振方向为近似的南北向.高原内部表现为强壳幔耦合型,高原外部则属于壳幔解耦型.这一横向过渡带与地表的断裂走向不一致,但在地壳和上地幔,其地球物理场(如:地壳厚度,布格重力异常和构造应力方向等)都具有横向过渡的特征.该横向过渡带邻近东喜马拉雅构造结,在板块边界动力学上有着重要的意义.王椿镛 常利军 吕智勇 秦嘉政 苏伟 Paul Silver Lucy Flesch 2007中国科学(D辑)2007,37,4:68
2Seismic anisotropy of upper mantle in eastern Tibetan Plateau and related crust-mantle coupling pattern显示文摘By using the polarization analysis of teleseismic SKS waveform data recorded at 116 seismic stations which respectively involved in China National Digital Seismograph Network, and Yunnan, Sichuan, Gansu and Qinghai regional digital networks, and portable broadband seismic networks deployed in Sichuan, Yunnan and Tibet, we obtained the SKS fast-wave direction and the delay time between fast and slow waves of each station by use of the stacking analysis method, and finally acquired the fine image of upper mantle anisotropy in the eastern Tibetan Plateau and its adjacent regions. We analyzed the crust-mantle coupling deformation on the basis of combining the GPS observation results and the upper mantle anisotropy distribution in the study area. The Yunnan region out of the plateau has dif-ferent features of crust-mantle deformation from the inside plateau. There exists a lateral transitional zone of crust-mantle coupling in the eastern edge of the Tibetan Plateau, which is located in the region between 26° and 27°N in the west of Sichuan and Yunnan. To the south of transitional zone, the fast-wave direction is gradually turned from S60°―70°E in southwestern Yunnan to near EW in south-eastern Yunnan. To the north of transitional zone in northwestern Yunnan and the south of western Sichuan, the fast-wave direction is nearly NS. From crust to upper mantle, the geophysical parameters (e.g. the crustal thickness, the Bouguer gravity anomaly, and tectonic stress direction) show the feature of lateral variation in the transitional zone, although the fault trend on the ground surface is inconsis-tent with the fast-wave direction. This transitional zone is close by the eastern Himalayan syntaxis, and it may play an important role in the plate boundary dynamics.Paul SILVER Lucy FLESCH 2007Science China Earth Sciences2007,50,8:33
3建立数据驱动的e-Science图书馆服务:机遇和挑战显示文摘在简要评述科学数据增长、存储管理和开放获取需求的基础上,介绍美国麻省理工学院(MIT)图书馆的DSpace图书馆数字资源存储系统和服务新模式,针对科学数据生命周期,提出图书馆建立数据驱动的e-Science图书馆特色服务的思考与策略。王学勤 Amy Stout Howard Silver 2011图书情报工作2011,55,13:24
4S-wave crustal and upper mantle's velocity structure in the eastern Tibetan Plateau——Deep environment of lower crustal flow显示文摘A teleseismic profile consisting of 26 stations was deployed along 30°N latitude in the eastern Tibetan Plateau. By use of the inversion of P-wave receiver function, the S-wave velocity structures at depth from surface to 80 km beneath the profile have been determined. The inversion results reveal that there is significant lateral variation of the crustal structure between the tectonic blocks on the profile. From Linzhi north of the eastern Himalayan Syntaxis, the crust is gradually thickened in NE direction; the crustal thickness reaches to the maximum value (~72 km) at the Bangong-Nujiang suture, and then decreased to 65 km in the Qiangtang block, to 57―64 km in the Bayan Har block, and to 40―45 km in the Sichuan Basin. The eastern segment of the teleseismic profile (to the east of Batang) coincides geographically with the Zhubalong-Zizhong deep seismic sounding profile carried out in 2000, and the S-wave velocity structure determined from receiver functions is consistent with the P-wave velocity structure obtained by deep seismic sounding in respect of the depths of Moho and major crustal interfaces. In the Qiangtang and the Bayan Har blocks, the lower velocity layer is widespread in the lower crust (at depth of 30―60 km) along the profile, while there is a normal velocity distribution in lower crust in the Sichuan Basin. On an average, the crustal velocity ratio (Poisson ratio) in tectonic blocks on the profile is 1.73 (σ = 0.247) in the Lhasa block, 1.78 (σ = 0.269) in the Banggong-Nujiang suture, 1.80 (σ = 0.275) in the Qiangtang block, 1.86 (σ = 0.294) in the Bayan Har blocks, and 1.77 (σ = 0.265) in the Yangtze block, respectively. The Qiangtang and the Bayan Har blocks are characterized by lower S-wave velocity anomaly in lower crust, complicated Moho transition, and higher crustal Poisson ratio, indicating that there is a hot and weak medium in lower crust. These are considered as the deep environment of lower crustal flow in the eastern Tibetan Plateau. Flowage of the ductile material in lower crust may be attributable to the variation of the gravitational potential energy in upper crust from higher on the plateau to lower off plateau.Paul SILVER 2008Science China Earth Sciences2008,51,2:24
5缺血性脑卒中和出血性脑卒中患者发病前后血压的变化显示文摘《中国高血压防治指南2010》指出,急性脑卒中的血压处理缺乏足够的临床试验证据,参考建议如下:急性脑卒中溶栓前血压应控制在<185/110mm Hg(1mm Hg=0.133kPa)。对急性缺血性脑卒中发病24h内血压升高的患者应谨慎处理,收缩压≥180mm Hg或舒张压≥100mm Hg或伴有严重心功能不全、主动脉夹层、高血压脑病者,一般不予降压。降压的合理目标是24h内血压降低约15%。有高血压病史且正在服用降压药物者,如神经功能平稳,可于脑卒中发病后24h开始使用降压药物。因此,了解脑卒中患者发病前后的血压情况对临床治疗有重要的意义。Fischer等研究者探讨缺血性脑卒中和出血性脑卒中患者发病前后血压的变化情况。结果表明,缺血性脑卒中患者发病后首次测量的收缩压低于出血性脑卒中。与发病前比较,缺血性脑卒中发病后收缩压略升高(约10.6mm Hg),24h内轻度降低(约13.6mm Hg);而出血性脑卒中发病后,收缩压明显升高(约40.7mm Hg),24h内明显下降(约41.1mm Hg)。出血性脑卒中发病前几天及几周的平均收缩压逐渐增加,而缺血性脑卒中无明显变化。出血性脑卒中患者发病3h内的最高收缩压比发病前高50.0 mm Hg,而缺血性脑卒中则低5.2mm Hg。综上所述,与发病前比较,出血性脑卒中发病后收缩压升高,而缺血性脑卒中无明显变化。Fischer U Cooney MT Bull LM Silver LE Chalmers J Anderson CS Mehta Z Rothwell PM 林东杰 叶鹏 2014中华高血压杂志2014,22,4:13
6孕前血压及其到妊娠早期的变化:先兆子痫和妊娠期高血压的早期危险因素显示文摘先兆子痫和妊娠期高血压是常见的妊娠并发症,与母婴发病率显著相关。尽管对怀孕期间的危险因素进行了广泛的研究,但大多数患妊娠期高血压疾病的妇女并不被认为是高风险的,预防措施仍不清楚。研究者评估了妊娠前的血压及其到妊娠早期的变化,将其作为妊娠高血压疾病发展新的危险标志。刘青(译) 刘莉(摘/审校) Nobles CJ Mendola P Mumford SL Silver RM Kim K Andriessen VC Connell M Sjaarda L Perkins NJ Schisterman EF 2020中华高血压杂志2020,28,12:12
7青藏高原东部及其邻区力学耦合的岩石圈变形模式显示文摘根据青藏高原东部及其邻区布设的143个宽频带固定和流动地震台站的远震记录的SKS波分裂分析获得了各台站的快波偏振方向和快慢波之间的时间延迟。SKS分裂分析结果总体上反映了高原东部的上地幔物质流动方向,即高原内部表现为环绕喜马拉雅东构造结的顺时针旋转。在造山运动过程中有关岩石圈地壳和地幔力学耦合的造山变形方式,用从GPS和第四纪断裂滑动速率数据确定的地面变形场和由地震波各向异性数据推断的地幔变形场联合分析来定量求得。在青藏高原东部和云南、四川等地区新近快速增加的GPS和SKS波分裂观测数据,提供了对青藏高原岩石圈地幔实际变形方式的检验。这些新的数据不仅加强了高原内部力学耦合岩石圈的证据,而且也解释了高原外部相同的耦合特征。文中引入简单剪切变形和纯剪切变形的概念,用于解释高原内外不同的耦合变形特征。青藏高原和周围区域力学耦合岩石圈的垂直连贯变形有两个方面的大陆动力学含义:第一,岩石圈垂直强度剖面被一个重要的条件所约束,即要求与重力势能变化相关的应力能够从地壳传递到地幔;第二,青藏高原各向异性的空间变化反映了一个岩石圈变形的大尺度模式,以及从高原内部的简单剪切变形向高原外部的纯剪切变形的过渡带。文中提出的力学耦合岩石圈变形模型与当前已有的多种造山运动变形模型具有不同的变形含义,因此,地幔变形在青藏高原隆升过程中起主要作用。王椿镛 常利军 苏伟 楼海 P. G. Silver L.M. Flesch 2008地学前缘2008,15,6:6
8WONCA研究论文摘要汇编——孕前服用低剂量阿司匹林的妊娠结果:EAGeR随机试验结果显示文摘背景孕前服用低剂量阿司匹林或许对妊娠结果起正性作用,但临床尚未对此做出充分的评价。本研究对低剂量阿司匹林能否提高有1~2次流产史妇女的活产率进行了调查。方法采用多中心、随机区组、双盲、安慰剂对照研究,将美国4个医疗中心18~40岁有妊娠意向的妇女纳入研究。入选标准:最初分组,受试者仅限于近1年内曾有过妊娠﹤20周流产1次的妇女;扩展分组,扩展至有1~2次流产史的妇女;对孕周及流产时间无限制。Schisterman EF Silver RM Lesher LL 周淑新 2014中国全科医学2014,17,20:6
9Trends in Extremes of Surface Humidity, Temperature, and Summertime Heat Stress in China显示文摘In the past half century, the mean summertime temperature in China has increased, with nights warm- ing more than days. Using surface station observations, we show that the frequency of extreme heat-stress events in China, caused by extremely hot and humid days as well as by heatwaves lasting for a few days, has increased over the period from 1951 to 1994 When humidity is high, hot weather can cause heat stress in humans. The increased heatrstress trend may pose a public healthJulian X.L. Wang and Dian J. Gaffen NOAA/ Air Resources Laboratory, Silver Spring, MD, 20910, USA 2001Advances in Atmospheric Sciences2001,18,5:6
10Varicella zoster virus vaccines: potential complications and possible improvements显示文摘Varicella zoster virus(VZV) is the causative agent of varicella(chicken pox) and herpes zoster(shingles). After primary infection, the virus remains latent in sensory ganglia, and reactivates upon weakening of the cellular immune system due to various conditions, erupting from sensory neurons and infecting the corresponding skin tissue. The current varicella vaccine(v-Oka) is highly attenuated in the skin, yet retains its neurovirulence and may reactivate and damage sensory neurons. The reactivation is sometimes associated with postherpetic neuralgia(PHN), a severe pain along the affected sensory nerves that can linger for years, even after the herpetic rash resolves. In addition to the older population that develops a secondary infection resulting in herpes zoster, childhood breakthrough herpes zoster affects a small population of vaccinated children. There is a great need for a neuro-attenuated vaccine that would prevent not only the varicella manifestation, but, more importantly, any establishment of latency, and therefore herpes zoster. The development of a genetically-defined live-attenuated VZV vaccine that prevents neuronal and latent infection, in addition to primary varicella, is imperative for eventual eradication of VZV, and, if fully understood, has vast implications for many related herpesviruses and other viruses with similar pathogenic mechanisms.Benjamin Silver Hua Zhu 2014Virologica Sinica2014,29,5:5
11基于蓝光LED的白光器件:用于固体发光的小颗粒YAG:Ce型荧光粉的合成显示文摘文章介绍了小颗粒YAG:Ce荧光粉的三种合成方法。这种荧光粉受到蓝光LED发出的光线的激发会发出黄光。在合成的pcLEDs里,蓝光和黄光混合形成了白光。本文解释了这种涂有YAG:Ce荧光粉的pcLED的色点的依赖性以及通过添加修复晶格点阵的催化剂以改变这种依赖型的方法。另外,文章还讨论了Ce件聚集中心的YAG:Ce荧光粉的效率的测量、烧成温度、激发波长。Jack Silver Robert Withnall George Fern Anthony Lipman 2008电子器件2008,31,1:4
12Bone Marrow Origin of Endothelial Progenitor Cells Responsible for Postnatal Vasculogenesis in Physiological and Pathological Neovascularization显示文摘Takayuki Asahara Haruchika Masuda Tomono Takahashi Christoph Kalka Christopher Pastore Marcy Silver Marianne Kearne Meredith Magner Jeffrey M. Isner 1999Circulation Research1999,,3:3
13Recurrent Pregnancy Loss: Summary and Clinical Recommendations显示文摘Richard Lee Robert Silver 2000Semin Reprod Med2000,,:3
14Randomised clinical trial: the safety and tolerability of T richuris suis ova in patients with Crohn’s disease显示文摘W. J. Sandborn D. E. Elliott J. Weinstock R. W. Summers A. Landry‐Wheeler N. Silver M. D. Harnett S. B. Hanauer 2013Aliment Pharmacol Ther2013,,3:2
15Remifentanil, Fentanyl, and Cardiac Surgery: A Double-Blinded, Randomized, Controlled Trial of Costs and Outcomes显示文摘Paul S. Myles Jennifer O. Hunt Helen Fletcher Jennifer Watts David Bain Andrew Silvers Mark R. Buckland 2002Anesthesia & Analgesia2002,,4:2
16Bone Marrow Origin of Endothelial Progenitor Cells Responsible for Postnatal Vasculogenesis in Physiological and Pathological Neovascularization显示文摘Takayuki Asahara Haruchika Masuda Tomono Takahashi Christoph Kalka Christopher Pastore Marcy Silver Marianne Kearne Meredith Magner Jeffrey M. Isner 1999Circulation Research1999,,3:2
17内镜下CO2激光环咽肌切开术的适应证显示文摘1简介环咽肌(cricopharyngeus,CP)是由咽下缩肌下缘的横行纤维组成,是食管上括约肌(the upper esophageal sphincter,UES)的主要组成部分。静息状态下,CP适当收缩,而吞咽时则适当放松。由于神经源性功能障碍或纤维化导致吞咽时CP不能适当放松时,功能障碍便发生了。CP功能障碍的症状包括吞咽困难、吞咽疼痛、呼吸困难、咳嗽和鼻腔反流。严重时会发生吸入和体重下降现象。Silver N Gal TJ 江玲燕(校) 2016中国医学文摘(耳鼻咽喉科学)2016,31,1:2
18Risk Factors for Posterior Compared to Anterior Ischemic Stroke: An Observational Study of the Registry of the Canadian Stroke Network显示文摘Subramanian G Silva J Silver F L Fang J Kapral M K Oczkowski W Gould L O’donnell M J 2009Neuroepidemiology2009,,1:2
19Chemoradiation with 5-fluorouracil and mitomycin C in the treatment of vulvar squamous cell carcinoma显示文摘Mulayim N Foster Silver D Schwartz P E 2004Gynecol Oncol2004,93,3:2
20Gliomatosis cerebri radiologic correlation显示文摘Felsberg GJ Silver SA Brown MT 1995AJNR1995,15,9:2
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