检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

张之洞筹创湖北农务学堂初期问题及原因探析

中国农史 2019年第2期38卷 74-84页

作者：石松盛邦跃南京农业大学中华农业文明研究院江苏南京210095

张之洞于19世纪末创办的湖北农务学堂,乃近代中国农业改良和农业教育开始发端的重要标志。农务学堂的筹创和发展经历了初期的困境和整顿后的改善两个阶段,而对于其筹创的初期阶段当前极少有文献和研究加以关注。张之洞创办农务学堂聘请... 详细信息

张之洞于19世纪末创办的湖北农务学堂,乃近代中国农业改良和农业教育开始发端的重要标志。农务学堂的筹创和发展经历了初期的困境和整顿后的改善两个阶段,而对于其筹创的初期阶段当前极少有文献和研究加以关注。张之洞创办农务学堂聘请的首位洋教习——美国人布里尔的相关档案,从亲历者的角度,帮助今人对于农务学堂筹创初期的相关史实和出现的问题有更多了解;并且为剖析这些问题产生的根本原因和评述张之洞的这一改良举措提供了更为客观的视角。

关键词：张之洞湖北农务学堂洋教习

在线全文

学校读者我要写书评

暂无评论

南方红土元素迁移特征及其古环境意义

土壤学报 2001年第1期38卷 25-31页

作者：熊尚发丁仲礼刘东生中国科学院地质与地球物理研究所北京100029

气候变化下土壤物质过程的响应特征是全球变化研究的重要主题。本文选取江西九江剖面，通过协变分析，对其元素迁移特征进行了研究。结果显示，剖面上部（褐黄色土层）和剖面下部（网纹红土层）的协变状态和元素迁移强度有明显的差别，... 详细信息

气候变化下土壤物质过程的响应特征是全球变化研究的重要主题。本文选取江西九江剖面，通过协变分析，对其元素迁移特征进行了研究。结果显示，剖面上部（褐黄色土层）和剖面下部（网纹红土层）的协变状态和元素迁移强度有明显的差别，从盐基赋存状态看，剖面下部元素迁移强度大大高于剖面上部，同时，不同元素的迁移模式的表现明显不同。研究表明，剖面元素组成主要受古气候变化引起的风化强度差异的控制，但也在一定程度上受母质物源变化的影响。

关键词：南方红土协变分析物质平衡风化特征元素迁移古环境

纳米SiO_2/环氧桐马酸酐黏合剂的力学特性和老化特性

在线全文

学校读者我要写书评

暂无评论

复合材料学报 2017年第3期34卷 582-587页

作者：程圣张沛红邵琦哈尔滨理工大学电气与电子工程学院电介质工程国家重点实验室培育基地哈尔滨150080

作为高压电机主绝缘的重要组成部分,环氧桐马酸酐黏合剂的性能与电机安全稳定运行密切相关。为改善环氧桐马酸酐黏合剂的力学特性和耐老化特性,制备了质量分数分别为1wt%、2wt%、3wt%和4wt%的纳米SiO_2/环氧桐马酸酐黏合剂,测试了其弯... 详细信息

作为高压电机主绝缘的重要组成部分,环氧桐马酸酐黏合剂的性能与电机安全稳定运行密切相关。为改善环氧桐马酸酐黏合剂的力学特性和耐老化特性,制备了质量分数分别为1wt%、2wt%、3wt%和4wt%的纳米SiO_2/环氧桐马酸酐黏合剂,测试了其弯曲强度和冲击强度以及老化前后的击穿场强。结果表明:1wt%纳米SiO_2含量的纳米SiO_2/环氧桐马酸酐黏合剂的弯曲强度提高24.79%,含2wt%纳米SiO_2的黏合剂冲击强度提高47.11%。老化前,纳米SiO_2/环氧桐马酸酐黏合剂的击穿场强随纳米SiO_2含量的增加先增加后减小,2wt%含量时达到最大值,提高7.3%。电老化后和热老化初期,含1wt%和2wt%纳米SiO_2的黏合剂击穿场强高于原始黏合剂,28天热老化后,各含量黏合剂的击穿场强与原始黏合剂趋于一致。

关键词：环氧桐马酸酐 SiO2 黏合剂力学特性击穿场强热老化电老化

The effect of growth temperature on a-plane ZnO formation on r-plane sapphire

在线全文

学校读者我要写书评

暂无评论

The effect of growth temperature on a-plane ZnO formation on...

Single-incision vs three-incision laparoscopic cholecystectomy for complicated and uncomplicated acute cholecystitis

第六届国际氧化锌及相关材料研讨会

作者： Chun-Yen Peng Jr-sheng Tian Yen-Teng Ho Department of Materials Science and Engineering National Chiao Tung University

＜正＞It is well established that the built-in electrostatic field caused by piezoelectric polarization in wurtzite structure makes the lower efficiency of carrier recombination which degrades the optical emitting pro...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第43期19卷 7743-7750页

作者： Shu-Hung Chuang Pai-Hsi Chen Chih-Ming Chang Chih-sheng Lin Department of Biological Science and Technology National Chiao Tung University Department of Surgery Mackay Memorial HospitalHsin-Chu Branch College of Management Fu Jen Catholic University Department of Nursing Mackay Memorial HospitalHsin-Chu Branch

AIM:To compare the clinical outcome of single-incision laparoscopic cholecystectomy(SILC)and three-incision laparoscopic cholecystectomy(3ILC)for acute ***:From July 2009 to September 2012,136patients underwent SILC or 3ILC for acute cholecystitis at a tertiary referral *** experienced surgeon performed every procedure using 5 or 10 mm 30-degree laparoscopes,straight instruments,and conventional *** patients with perforated gallbladder and diffuse peritonitis and 23 patients with mild acute cholecystitis were *** remaining 108 patients were divided into complicated and uncomplicated groups according to pathologic *** demography,clinical data,operative results and complications were recorded and ***:Fifty patients with gangrenous cholecystitis,gallbladder empyema,or hydrops were classified as the complicated group,and 58 patients with acute cholecystitis were classified as the uncomplicated ***-three(46.0%)of the patients in the complicated group(n=50)and 39(67.2%)of the patients in the uncomplicated group(n=58)underwent SILC;all others underwent *** postoperative length of hospital stay(PLOS)was significantly shorter in the SILC subgroups than the 3ILC subgroups(3.5±1.1 d vs 4.6±1.3 d,P<0.01 in the complicated group;2.9±1.1 d vs 3.7±1.4 d,P<0.05 in the uncomplicated group).The maximum body temperature recorded at day 1 and at day 2 following the procedure was lower in the SILC subgroups,but the difference reached statistical significance only in the uncomplicated group(37.41±0.56℃vs 37.80±0.72℃,P<0.05 on postoperative day 1;37.10±0.43℃vs 37.57±0.54℃,P<0.01 on postoperative day 2).The operative time,estimated blood loss,postoperative narcotic use,total length of hospital stay,conversion rates,and complication rates were similar in both SILC and 3ILC *** complicated group had longer operative time(122.2±35.0 min vs 106.6±43.6 min,P<0.05),longer PLOS(4.1±1.3 d vs 3.2±1.2 d,P<0.

关键词： Single-incision laparoscopic cholecystectomy Single-incision laparoscopic surgery Laparoen doscopic single site surgery Cholecystectomy Acute cholecystitis Complicated cholecystitis Gangrenous cholecystitis

The Simulation of UV-Vis Absorption Spectra and Fluorescence Spectra of Organic Molecules in solvents

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

The Simulation of UV-Vis Absorption Spectra and Fluorescence...

The Proton Transfer and Dissociation Dynamics of Water Cluster Ions: H5O2+,D5O2+,and H3D2O2+

中国化学会第十二届全国量子化学会议

作者： Ruihong Duan Chaoyuan Zhu Jianguo Yu sheng Hsien Lin Department of Applied Chemistry Institute of Molecular Science and Center for Interdisciplinary Molecular ScienceNational Chiao-Tung University Department of Chemistry Beijing Normal University

The UV-Vis absorption and fluorescence spectra of alpha-carboline（AC）and carbazole（CZ）in different solvents,n-hexane and acetonitrile,have been simulated by using Franck-Condon simulation including inhomogeneous broadening of solvent *** harmonic oscillator and scaling factors on the force constant have been applied in the *** equilibrium geometries have been calculated in gas phase and with polarizable continuum model（PCM）in solvent n-hexane and acetonitrile *** DFT method is used to calculate the equilibrium geometries of the ground state S0 for AC and CZ,and the TDDFT method is used to calculate the equilibrium geometries of the first two singlet excited states S1 and *** forces on the solute by solvent can change the restoring force of the atoms in the solute molecule,and we can treat it as constant scaling factors on the force *** simulated spectra by using the geometries in gas phase with scaling factors is much better than that without scaling factors,and the spectra by using the geometries in solvent with scaling factors can match the experiment data almost completely.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Proton Transfer and Dissociation Dynamics of Water Clust...

第十三届全国化学动力学会议

作者： Di Song Hongmei Su Fan-ao Kong sheng-Hsien Lin Beijing National Laboratory for Molecular Sciences (BNLMS) State Key Laboratory of Molecular Reaction Dynamics Institute of Chemistry Chinese Academy of Sciences Institute of Applied Chemistry Institute of Molecular Science Chiao-Tung University

＜正＞Water cluster ions are of great interest since they are involved in aqueous proton transfer which plays important roles in many chemical and biological processes. We investigated the proton transfer and dissocia... 详细信息

关键词： water cluster ions proton transfer dissociation RRKM

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

一种低功耗的1024位MOS随机存储器

清华大学学报(自然科学版) 1978年第2期 14-19页

作者：徐葭生李瑞伟庄同曾电子工程系

本文介绍一种１０２４位ＭＯＳ随机存储器电路。采用Ｐ沟硅栅工艺，标准的四管单元结构。电路设计的主要特点是：１．在地址译码器中串入由内部时钟控制的接地管，完全消除了直流通路，使功耗大大降低；２．地址码封锁电路采用了一种由... 详细信息

本文介绍一种１０２４位ＭＯＳ随机存储器电路。采用Ｐ沟硅栅工艺，标准的四管单元结构。电路设计的主要特点是：１．在地址译码器中串入由内部时钟控制的接地管，完全消除了直流通路，使功耗大大降低；２．地址码封锁电路采用了一种由时钟控制的单管门形式，简化了电路；３．字线通过一个小跨导的放电管接地，提高了抗干扰能力。

关键词：地址码主要特点地址译码器字线电路设计随机存储器随机存取存储器功耗 MOS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

分立对称性与SO(2n)大统一模型

高能物理与核物理 1984年第6期 668-676页

作者：万陵德鲁公儒杜东生新乡师院中国科学院高能物理研究所

本文应用分立对称性S,对SO(2n)×S大统一模型进行了系统的分析。我们的结论是:SO(14)×S与SO(16)×S是比较好的代大统一规范群。作为例子,本文给出SO(14)×S与SO(16)×S两个代大统一模型。它们容纳了四代通常费米子,并保持SU(3)。渐近... 详细信息

本文应用分立对称性S,对SO(2n)×S大统一模型进行了系统的分析。我们的结论是:SO(14)×S与SO(16)×S是比较好的代大统一规范群。作为例子,本文给出SO(14)×S与SO(16)×S两个代大统一模型。它们容纳了四代通常费米子,并保持SU(3)。渐近自由。模型保留了SO(10)模型中得到的全部好的结果。

关键词：费米子质量统一模型大统一弱流荷电流(粒子物理) 分立对称性破缺 SO