检索结果-南通市图书馆

维普期刊数据库

Pressure dependence of brillouin frequency shift in bare silica optical fibers

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2012年第10期10卷 20-22页

作者：顾海栋董惠娟张广玉何俊徐宁 douglas.J.brown School of Mechatronics Engineering Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin Institute of Technology Department of Electrical and Computer Engineering University of New BrunswickFrederictonNB E3B 5A3Canada

The effect of hydrostatic pressure （up to 28 MPa） on brillouin frequency shift （bFS） within two types of bare, single-mode fibers is studied via brillouin optical time domain analysis technique. Experimental results show a negative linear relation between pressure and bFS, with almost the same sensitivity in both types of fibers. The average value of experimental slopes is –0.742 MHz/MPa. This value is found to be well suited to theoretical analysis on the basis of data on bulk silica glass in previous reports. This preliminary evaluation may result in a new method for distributed pressure sensing along silica optical fiber.

关键词： Frequency shift keying Hydrostatic pressure Silica Time domain analysis

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

阿拉伯—努比亚地盾中大洋铅与大陆铅的分布

宝石和宝石学杂志(中英文) 1985年第3期 64-81页

作者： John S.Stacey douglas b Stoeser 阮天健

阿拉伯-努比亚地盾中长石、全岩及方铅矿样品中普通铅的新老数据可以分成两大组:Ⅰ组铅,具有大洋(地幔)特征;Ⅱ组铅,混入了早于元古界的大陆地壳成分。前者见于埃及的红海丘陵及阿拉伯地盾的西部与南部。后者见于地盾的东北部与东部,以... 详细信息

阿拉伯-努比亚地盾中长石、全岩及方铅矿样品中普通铅的新老数据可以分成两大组:Ⅰ组铅,具有大洋(地幔)特征;Ⅱ组铅,混入了早于元古界的大陆地壳成分。前者见于埃及的红海丘陵及阿拉伯地盾的西部与南部。后者见于地盾的东北部与东部,以及邻近Najran的东南部,此外,在南边的也门,东边的阿曼。西边的埃及阿斯旺也有所见。普通铅数据的这种分布特点表明,阿——努地盾具有一个大洋性的陆核,其外围的岩石则至少有一部分是由较古老的大陆物质所形成。较古老的铅混入元古代岩石中的机制可能有两种:1.直接来自下伏早于元古代的基底;2.通过远海沉积物或来自附近大陆的沉积物的俯冲。这两种机制在地盾的不同地区起的作用不同。新的锆石的铀一铅年龄数据表明,在阿拉伯地盾东部的Jabal Dahul东南有早元古代基底的存在。在Al Amar断层带中还发现了年龄达20亿年的锆石,所有这些资料证实了普通铅数据的推测,即东部阿拉伯地盾至少有一部分具有更古老的大陆基底。因为大陆边缘特别有利于成矿,所以,上述发现可能对找矿有重要的指导意义,特别是对于锡、钨、钼等矿床的勘查。

关键词：同位素比值早元古代地盾地台地壳地球外壳地球内部闪长岩深成岩错石岩石方铅矿硫化矿物 Pb 阿拉伯阿斯旺埃及放射性年龄同位素地质年龄辉长岩基性岩显生宙显动宙岛弧火山岩变质火山岩变火山岩模式年龄大洋大陆地貌努比亚

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

特高频窄带混合滤波器的设计

航天电子对抗 1992年第1期 51-55页

作者： douglas b.Miron 董尔令魏建宁

这里描述的滤波器是由集总元件和传输线混合而成的。滤波器的基本电路是一个开环谐振器,它是由四分之一波长的开路线和跨接在其两端的电容构成,相当于一个并联LC谐振器。本文提出了两点见解:1)加一并联电容以增加谐振器的Q值;2)给出增... 详细信息

这里描述的滤波器是由集总元件和传输线混合而成的。滤波器的基本电路是一个开环谐振器,它是由四分之一波长的开路线和跨接在其两端的电容构成,相当于一个并联LC谐振器。本文提出了两点见解:1)加一并联电容以增加谐振器的Q值;2)给出增加并联电容后的、新的开环谐振器的等效电路及设计方程。利用设计方程可实现窄带滤波器的设计。本文对一些实例、计算结果及插损情况作了讨论。这些滤波器在尺寸和插损方面均优于用耦合线设计的滤波器。

关键词：滤波器谐波振荡器设计——方程

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

南极中山站-昆仑站间地壳厚度分布

极地研究 2014年第2期26卷 177-185页

作者：冯梅安美建安春雷史贵涛赵越李院生 douglas Wiens 中国地质科学院地质力学研究所北京100081 中国极地研究中心上海200136 Department of Earth and Planetary Science Washington University

自第4个国际极地年2007/2008开始至2013年,中国南极内陆冰盖科考队相继在自南极大陆边缘的中山站至东南极地形最高点昆仑站(Dome A)一线进行了低温甚宽频地震观测。本文对7个天然地震台站数据进行了分析,提取了这些台站的S波接收函数,... 详细信息

自第4个国际极地年2007/2008开始至2013年,中国南极内陆冰盖科考队相继在自南极大陆边缘的中山站至东南极地形最高点昆仑站(Dome A)一线进行了低温甚宽频地震观测。本文对7个天然地震台站数据进行了分析,提取了这些台站的S波接收函数,据此反演获得了这些台站下的地壳厚度分布。结果显示:随着纬度的升高,地壳厚度由大陆边缘的中山站下的约38 km逐渐增加至CHNb台下的58 km,随后又于CHNA台站下方减薄至47 km,然后快速增大到南极地形最高点昆仑站(Dome A)下的62 km。昆仑站或Dome A是南极大陆地壳最厚的地方。从中山站至昆仑站之间地壳厚度的变化与冰下地貌变化存在明显的相关性,它们都说明了从中山站至CHNb之间地壳构造相对均匀。在距昆仑站约200 km的CHNA台下的地壳厚度(约47 km)明显比临近台站地壳偏薄,这可能说明了甘伯采夫山脉地壳侧向变化较大,即其形成时所遭受的构造作用较复杂。

关键词：地壳厚度接收函数昆仑站东南极南极内陆科考

维普期刊数据库

Long-Term Detection of Propofol Glucuronide in Urine Following Anesthetic Induction and Maintenance with Propofol

在线全文

学校读者我要写书评

暂无评论

Pharmacology & Pharmacy 2013年第7期4卷 528-534页

作者： Joseph Salerno Joseph Jones Mary Jones Charles Plate douglas Lewis United States Drug Testing Laboratories Inc. (USDTL) Des Plaines USA United States Drug Testing Laboratories Inc. (USDTL) Des Plaines USA.

Propofol is the most commonly used compound for the intravenous induction and maintenance of anesthesia. Propofol addiction and abuse have become causes for concern in the healthcare community, especially among anesthesia and surgical professionals. The US Drug Enforcement Administration does not list propofol on any Schedules and most hospitals do not have inventory controls in place to prevent its misuse. Propofol is detectable in blood plasma as the parent compound for as much as 15 hours post-anesthesia. The metabolite propofol glucuronide (PPFG) has been detected in blood and urine as far out as 60 hours. Here we report the long-term renal excretion of PPFG in specimens from A) four participants following a 14-day course of orally ingested propofol dosing, and b) a female patient following anesthetic induction and 15 minutes’ maintenance with propofol. Urinary PPFG was measurable well above limits of quantitation up to 6 days following oral ingestion and 28 days post-anesthesia. We also present a third set of data evaluating the likelihood of passive exposure to aerosolized propofol in the surgical environment by analyzing the levels of urinary PPFG of healthcare workers following operating room work shifts. The results presented here demonstrate that quantitation of PPFG in urinary samples is an efficient method of long-term screening for propofol misuse and abuse.

关键词： Anesthetics Drug Testing Metabolism Pharmacokinetics Propofol Propofol Glucuronide Urine

Immediate mandibular reconstruction of a u.s. navy seal with a free fibula flap following osteoradionecrosis with pathological fracture

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

中国口腔颌面外科杂志 2008年第B5期6卷 218-219页

作者： Ferguson, b Caballero, H. Cole, S. Hatt, H. bach, K. douglas, T. Gallus, K. Laughlin, R. Dental Department Naval Medical Center Suit 206 34800 BobWilson Dr San Diego CA 92134 U.S.A.

The number of U。S。Navy SEALs that serve within U。S。Special Operations Command (SOCOM) is fewer than 2,500; this is an extremely small number when compared to the 1.5 million total U。S。military personnel currently serving on active duty。When a highly-trained highly-specialized service person is injured or medically incapacitated, it is extremely important to return him to an operational status as soon as possible。Due to the physical requirements of these personnel, reconstruction options can be limited。We present a U。S。Navy SEAL who was diagnosed with osteoradionecrosis (ORN) and a pathologic fracture of the mandible。The gamet of reconstruction options were considered。A flee fibular flap for mandibular reconstruction allowed the surgical team to complete a one-stage reconstruction with minimized functional disability, which permitted the patient a fully operational return to the SOCOM community。Case report: A 41yo male active duty Navy personnel with a history of squamous cell cancer of the base of tongue (T1N2bM0) was diagnosed with ORN。Initial treatment consisted of the Marx-University of Miami Protocol for Hyperbaric oxygen therapy。He responded with complete soft tissue coverage of the exposed bone to the right mandible。One month later, the patient, returned to the Otolaryngology Department with recurrence of exposed bone to the right mandible。He was referred to the Oral and Maxillofacial Surgery clinic at Navy Medical Center San Diego for evaluation and treatment。Surgical debridement of right mandible to bleeding bone leaving an intact inferior border was performed。

关键词：颚修复方法整形技术腓骨放射性骨坏死

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

环球英语教程影印版

Outcomes of submucosal(T1b) esophageal adenocarcinomas removed by endoscopic mucosal resection

2006年

作者： ( )Susan Stempleski，( )Nancy douglas，( )James R. Morgan[编]

本套书的每个单元都由A、b两课组成。其中A课主要是介绍每一单元的主题和所涉及到的基本语言点等内容。

ISBN: (纸本)754460019X

本套书的每个单元都由A、b两课组成。其中A课主要是介绍每一单元的主题和所涉及到的基本语言点等内容。

关键词：英语

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Endoscopy 2016年第20期8卷 763-769页

作者： Darren D ballard Neel Choksi Jingmei Lin Eun-Young Choi b Joseph Elmunzer Henry Appelman douglas K Rex Hala Fatima William Kessler John M DeWitt Division of Gastroenterology and Hepatology Medical College of Wisconsin Division of Gastroenterology University of Michigan Department of Pathology Indiana University Department of Pathology University of Michigan Division of Gastroenterology and Hepatology University of South Carolina Division of Gastroenterology and Hepatology Indiana University

AIM To investigate the outcomes and recurrences of p T1 b esophageal adenocarcinoma(EAC) following endoscopic mucosal resection(EMR) and associated *** Patients undergoing EMR with pathologically confirmed T1 b EAC at two academic referral centers were retrospectively *** were divided into 4 groups based on treatment following EMR:Endoscopic therapy alone(group A),endoscopic therapy with either chemotherapy,radiation or both(group b),surgicalresection(group C) or no further treatment/lost to follow-up(by a central ***-up data was obtained from the academic centers,primary care physicians and/or referring *** analysis was performed to identify factors predicting recurrence of *** Fifty-three patients with T1 b EAC underwent EMR,of which 32(60%) had adequate follow-up ≥ 12 mo(median 34 mo,range 12-103).There were 16 patients in group A,9 in group b,7 in group C and 21 in group *** follow-up in groups A to C was 34 mo(range 12-103).Recurrent EAC developed overall in 9 patients(28%) including 6(38%) in group A(median:21 mo,range:6-73),1(11%) in group b(median:30 mo,range:30-30) and 2(29%) in group C(median 21 mo,range:*** of 9 recurrences were local;of the 6 recurrences,5 were treated with endoscopy *** predictors of recurrence of EAC were *** Endoscopic therapy of T1 b EAC may be a reasonable strategy for a subset of patients including those either refusing or medically unfit for esophagectomy.

关键词： Esophageal cancer Submucosal T1b Endoscopic mucosal resection Chemotherapy Esophagectomy

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

马咽部囊肿

动物医学进展 1981年第1期 15-16页

作者： douglas b.Koch lloyd P.Tate 范立伩

马上呼吸道阻塞的许多原因中,咽部囊肿是比较少见的。在马,咽部囊肿最常发现于会厌软骨下区域,是胚胎发生期甲状舌管的残迹。咽部背侧囊肿,即颅咽管残迹,一般是较为少见的。咽其他部位的囊

关键词：囊肿摘除颅咽管残迹甲状舌管囊肿甲状腺舌囊肿喉切开术