检索结果-南通市图书馆

An end-to-side suspender pancreaticojejunostomy: A new invagination pancreaticojejunostomy

Hepatobiliary & Pancreatic Diseases International 2018年第2期17卷 163-168页

作者： Bin Li Chang Xu zhi-quan qiu Chen Liu Bin Yi Xiang-Ji Luo Xiao-Qing Jiang Department of Biliary Tract Surgery Eastern Hepatobiliary Surgery Hospital Secondary Military Medical University

Background: Postoperative pancreatic fistula(POPF) is a severe complication of the pancreaticoduodenectomy(PD). Recently, we introduced a method of suspender pancreaticojejunostomy(PJ) to the PD. In this study, we retrospectively analyzed various risk factors for complications after PD. We also introduced and assessed the suspender PJ to demonstrate its ***: Data from 335 patients with various periampullary lesions, who underwent the Whipple procedure(classic Whipple procedure or pylorus-preserving) PD by either traditional end-to-side invagination PJ or suspender PJ, were analyzed. The correlation between either perioperative or postoperative complications and corresponding PD approaches was evaluated by univariate ***: A total of 147 patients received the traditional end-to-side invagination PJ, and 188 patients were given the suspender PJ. Overall, 51.9% patients had various complications after PD. The mortality rate was 2.4%. The POPF incidence in patients who received the suspender PJ was 5.3%, which was significantly lower than those who received the traditional end-to-side invagination PJ(18.4%)(P < 0.001).Univariate analysis showed that PJ approach and the pancreas texture were significantly associated with the POPF incidence rate(P < 0.01). POPF was a risk factor for both postoperative abdominal cavity infection(OR = 8.34, 95% CI: 3.99–17.42, P < 0.001) and abdominal cavity hemorrhage(OR = 4.86, 95% CI:1.92–12.33, P = 0.001).Conclusions: Our study showed that the impact of the pancreas texture was a major risk factor for pancreatic leakage after a PD. The suspender PJ can be easily accomplished and widely applied and can effectively decrease the impact of the pancreas texture on pancreatic fistula after a PD and leads to a lower POPF incidence rate.

关键词： Pancreaticoduodenectomy Pancreaticojejunostomy Postoperative pancreatic fistula

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

平面薄膜天线张拉系统优化设计及天线结构模态分析

引用

宇航学报 2017年第4期38卷 344-351页

作者：刘志全邱慧李潇林秋红中国空间技术研究院总体部北京100094

设计航天器平面薄膜天线双重索网张拉系统的构型,并以可伸展支撑杆承受轴力最小、薄膜阵面有效面积比最大、端杆长度最小为优化目标,对张拉系统进行多目标优化。优化后可伸展支撑杆所受轴力减小了15.51%,薄膜阵面有效面积比提高了1.25%... 详细信息

设计航天器平面薄膜天线双重索网张拉系统的构型,并以可伸展支撑杆承受轴力最小、薄膜阵面有效面积比最大、端杆长度最小为优化目标,对张拉系统进行多目标优化。优化后可伸展支撑杆所受轴力减小了15.51%,薄膜阵面有效面积比提高了1.25%,端杆长度减小了0.30%。利用ABAQUS软件对索膜结构、支撑框架以及天线整体的模态分别进行仿真分析,将天线结构等效模型基频的解析解与仿真结果进行比对,二者相互印证。最后通过仿真分析,得出薄膜内拉应力、可伸展支撑杆壁厚、可伸展支撑杆铺层角度和端杆壁厚对天线整体基频的影响规律。

关键词：平面薄膜天线双重索网张拉系统优化结构模态

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

北京市怀柔区实施水痘疫苗2剂次程序的流行病学特征

引用

职业与健康 2018年第3期34卷 348-351,355页

作者：魏志权王秋香刘利英北京市怀柔区疾病预防控制中心计划免疫科北京101400

目的了解北京市怀柔区疫苗两剂接种程序实施前后,水痘的发病特征与流行趋势变化情况,为今后制定水痘防控措施提供流行病学依据。方法对2008—2016年北京市怀柔区水痘发病资料进行整理、分析,并以2012年(水痘2剂接种程序实施年)为分界点... 详细信息

目的了解北京市怀柔区疫苗两剂接种程序实施前后,水痘的发病特征与流行趋势变化情况,为今后制定水痘防控措施提供流行病学依据。方法对2008—2016年北京市怀柔区水痘发病资料进行整理、分析,并以2012年(水痘2剂接种程序实施年)为分界点,比较2008—2011年与2013—2016年水痘流行病学特征。结果 2008—2011年北京市怀柔区共报告水痘1 317例,报告发病率87.02/10万,2013—2016年共报告水痘病例773例,报告发病率47.94/10万;托幼儿童、散居儿童、学生这3类重点人群病例构成比由2008—2011年的81.25%降至2013—2016年的58.75%。结论水痘2剂次接种程序效果显著,有助于控制人群发病水平。

关键词：水痘 2剂次流行病学特征

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Review of Large Spacecraft Deployable Membrane Antenna Structures

引用

Chinese Journal of Mechanical Engineering 2017年第6期30卷 1447-1459页

作者： zhi-quan Liu Hui qiu Xiao Li Shu-Li Yang Beijing Institute of Spacecraft System Engineering China Academy of Space Technology Beijing 100094 China

The demand for large antennas in future space missions has increasingly stimulated the development of deployable membrane antenna structures owing to their light weight and small stowage volume. However, there is little literature providing a comprehensive review and comparison of different membrane antenna structures. Space-borne membrane antenna structures are mainly classified as either parabolic or planar membrane antenna structures. For parabolic membrane antenna structures, there are five deploying and forming methods, including inflation, inflation-rigidization, elastic ribs driven, Shape Memory Polymer （SMP）-inflation, and electrostatic form- ing. The development and detailed comparison of these five methods are presented. Then, properties of membrane materials （including polyester film and polyimide film） for parabolic membrane antennas are compared. Additionally, for planar membrane antenna structures, frame shapes have changed from circular to rectangular, and different ten- sioning systems have emerged successively, including single Miura-Natori, double, and multi-layer tensioning systems. Recent advances in structural configurations, tensioning system design, and dynamic analysis for planar membrane antenna structures are investigated. Finally, future trends for large space membrane antenna structures are pointed out and technical problems are proposed, including design and analysis of membrane structures,materials and processes, membrane packing, surface accuracy stability, and test and verification technology. Through a review of large deployable membrane antenna structures, guidance for space membrane-antenna research and applications is provided.

关键词： Membrane antenna. Parabolic Plane.Tensioning system Dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Measurements of the equivalent thicknesses of three-dimensional spiral galactic disks

引用

Research in Astronomy and Astrophysics 2009年第8期9卷 883-887页

作者： Gang Li zhi-quan Luo qiu-He Peng Institute of Theoretical Physics China West Normal University Nanchong 637002 China Department of Astronomy Nanjing University Nanjing 210093 China

Spiral arms are fitted after the data from the latest spiral galactic images released by the Sloan Digital Sky Survey are processed. Equivalent thicknesses of 42 spiral galactic disks are derived, which increase the f... 详细信息

关键词： galaxies spiral -- Galaxy disk

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Origin of Glitches in Pulsars—Phase Oscillation between Anisotropic Superfluid and Normal State of Neutrons in Neutron Stars

引用

Chinese Journal of Astronomy and Astrophysics 2006年第3期6卷 297-304页

作者： qiu-He Peng zhi-quan Luo Chih-Kang Chou School of Physics and Electronic Information China West Normal University Nanchong 637002 Department of Astronomy Nanjing University Nanjing 210093 Department of Physics Sichuan University Chengdu 610065 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012

Considering neutron star heating by magnetic dipole radiation from ^3PF2 superfluid neutron vortices inside the star, we propose a neutron phase oscillation model between the normal neutron Fermi fluid and the ^3PF2 superfluid neutron vortices at the transition temperature of Ttrans = （2 - 3）× 10^8 K. With this model we can qualitatively explain most of the observations on pulsar glitches up to date.

关键词： stars: neutron - pulsars: general

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Collapse Velocity and Prompt Explosion for the Presupernova Model Ws15M_⊙

引用

Chinese Journal of Astronomy and Astrophysics 2006年第4期6卷 455-460页

作者： zhi-quan Luo Men-quan Liu qiu-He Peng Zuo-Heng Xie Institute of Theoretical Physics China West Normal University Nanchong 637002 Department of Physics Sichuan University Chengdu 610065 Department of Astronomy Nanjing University Nanjing 210093 Institute of Applied Mathematics Chinese Academy of Sciences Beijing 100080

For the presupernova modelWs15M⊙, we re-calculate the electron capture （EC） timescale and hydrodynamical （HD） timescale. We found that the EC timescale can be smaller than the HD timescale in the inner region of the collapse iron core at the moment immediately before the shock wave bounce. The change in these two timescales at the late stage of core collapse is expected to affect the collapse velocity. If the late-time collapse velocity is artificially increased by a small quantity, then prompt explosion of the supernova may happen. Further calculations are still needed to check the plausibility of the acceleration mechanism caused by the faster EC process.

关键词： star: supernova-- nuclear reaction -- nucleosynthesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and characterization of biodegradable amphiphilic PEG-grafted poly(DTC-co-CL)

引用

Chinese Chemical Letters 2010年第10期21卷 1255-1258页

作者： qiu Jin Zhang Wei Pu Zhu zhi quan Shen MOE Key Laboratory of Macromolecule Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

A novel biodegradable copolymer, poly（5,5-dibromomethyltrimethylene carbonate-co-ε-caprolactone）（poly（DBTC-co-CL）） with pendant bromine groups, was synthesized via ring-opening polymerization （ROP） of ε-caprolactone （CL） and 5,5- dibromomethyltrimethylene carbonate （DBTC） using stannous octoate （Sn（Oct）2） as catalyst. Then the pendant bromine groups were completely converted into azide form, which permitted ＂click＂ reaction with alkyne-terminated polyethylene （A-PEG） by Huisgen 1,3-dipolar cycloadditions preparing biodegradable amphiphilic poly（DTC-co-CL）-g-PEG graft copolymer. The graft copolymer was characterized by nuclear magnetic resonance （NMR） and size-exclusion chromatography （SEC）.

关键词： Polycarbonate "Click" reaction Graft copolymer Ring-opening polymerization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

CATALYTIC ACTIVITIES OF RARE-EARTH CALIXARENE COMPLEXES IN POLYMER SYNTHESES

引用

Chinese Journal of Polymer Science 2005年第6期23卷 593-602页

作者： zhi-quan Shen Institute of Polymer Science Zhejiang University Hangzhou 310027 China

The studies of our group on the catalytic activities of rare earth calixarene complexes in polymer syntheses are reviewed. Rare earth calixarene complexes are effect catalysts for the polymerizations of butadiene, isoprene, ethylene, styrene, propylene oxide, styrene oxide, trimethylene carbonate and 2,2-dimethyl-trimethylene carbonate.

关键词： Rare earth complex Calixarene Polymer synthesis.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multiple phase detector of M-ary phase shift keying symbols in code division multiple access systems

引用

Journal of Central South University 2011年第4期18卷 1080-1086页

作者： quan zhi Federal University of Juiz de fora Electrical Engineering Juiz de fora MG Brazil Zip

A novel iterative technique, the phase descent search detection was proposed. This technique constrained the solution （PDS） algorithm, for M-ary phase shift keying （M-PSK） symbols to have a unit magnitude and it was based on coordinate descent iterations where coordinates were the unknown symbol phases. The PDS algorithm, together with a descent local search （also implemented as a version of the PDS algorithm）, was used multiple times with different initializations in a proposed multiple phase detector; the solution with the minimum cost was then chosen as the final solution. The simulation results show that for highly loaded multiuser scenarios, the proposed technique has a detection performance that is close to the single-user bound. The results also show that the multiple phase detector allows detection in highly overloaded scenarios and it exhibits near-far resistance. In particular, the detector has a performance that is significantly better, and complexity that is significantly lower, than that of the detector based on semi-definite relaxation.

关键词： coordinate descent complexity M-ary phase shift keying (M-PSK) multiuser detection quadratic optimization semi-definite relaxation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：