检索结果-南通市图书馆

Competitive adsorption of heavy metal ions on peat

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2008年第2期18卷 255-260页

作者： liu zhi-rong ZHOU Li-min WEI Peng ZENG Kai WEN Chuan-xi LAN Hui-hua Department of Applied Chemistry East China University of Technology Fuzhou Jiangxi 344000 China Key Laboratory of Nuclear Resources and Environment Ministry of Education of China Nanchang Jiangxi 330013 China

The uptake capacities, and the adsorption kinetics, of copper, Cu（Ⅱ）, nickel, Ni（Ⅱ）, and cadmium, Cd（Ⅱ）, on peat have been studied under static conditions. The results show that the adsorption rates are rapid： equilibrium is reached in twenty minutes. The adsorption of copper, nickel and cadmium is pH dependent over the pH range from 2 to 6. The adsorption kinetics can be excellently described by the Elovich kinetic equation. The adsorption isotherm fits a Langmuir model very well. The adsorption capacities follow the order Cu^2＋〉 Ni^2＋〉 Cd^2＋ in single-component systems and the competitive adsorption capacities fall in the decreasing order Cu^2＋〉 Ni^2＋〉 Cd^2＋ in multi-component systems. The adsorption capacities of these three heavy metal ions on peat are consistent with their observed competitive adsorption capacities.

关键词： peat copper nickel cadmium competitive adsorption

在线全文

学校读者我要写书评

暂无评论

小型圆极化天线的交叉极化抑制方法研究

电子学报 2021年第12期49卷 2490-2496页

作者：罗艺柳志荣中国电子科技集团公司第十研究所四川成都610036 陕西蓝鹰航空电器有限公司陕西西安710000

本文研究了一种小型圆极化微带天线在低仰角下抑制交叉极化的方法.文中提出了在辐射贴片上设置一个交叉槽来缩小天线尺寸,其高度和直径的仅为0.123倍波长和0.777倍波长.进一步针对该天线,分析了天线在不同底板类型下的低仰角交叉极化特... 详细信息

本文研究了一种小型圆极化微带天线在低仰角下抑制交叉极化的方法.文中提出了在辐射贴片上设置一个交叉槽来缩小天线尺寸,其高度和直径的仅为0.123倍波长和0.777倍波长.进一步针对该天线,分析了天线在不同底板类型下的低仰角交叉极化特性,提出了一种紧凑的弯折线环腔底板结构.采用紧凑的MLRC(Meander-Line Ring Cavity)结构可以显著降低天线在低仰角下的交叉极化,并且在整个上半空间的轴比(AR,Axial Ratio)也得到改善.所获得的腔体高度和直径仅为0.064倍波长和0.448倍波长.天线电压驻波比(VSWR,Voltage Standing Wave Ratio)小于2的阻抗带宽达到20.8%,轴比小于3dB的圆极化带宽为8.5%.从天顶到水平面,交叉极化电平不大于23.2dB.轴比小于3dB时,波束宽度可达190°以上.

关键词：圆极化天线交叉极化弯折线环腔低仰角圆极化带宽

Preliminary Study on the Lesion Location and Prognosis of Cubital Tunnel Syndrome by Motor Nerve Conduction Studies

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2015年第9期128卷 1165-1170页

作者： Zhu liu zhi-rong Jia Ting-Ting Wang Xin Shi Wei Liang Department of Neurology The First Hospital of Peking University Beijing 100034 China

Background：To study lesions＇ location and prognosis of cubital tunnel syndrome （CubTS） by routine motor nerve conduction studies （MNCSs） and short-segment nerve conduction studies （SSNCSs,inching test）.Methods：Thirty healthy subjects were included and 60 ulnar nerves were studied by inching studies for normal ***-six patients who diagnosed CubTS clinically were performed bilaterally by routine MNCSs and ***-up for 1-year,the information of brief complaints,clinical symptoms,and physical examination were ***：Sixty-six patients were included,88 of nerves was abnormal by MNCS,while 105 was abnormal by the inching *** epicondyle to 2 cm above medial epicondyle is the most common segment to be detected abnormally （59.09％）,P ＜ ***-two patients were followed-up,17 patients＇ symptoms were *** of the patients were treated with drugs and modification of bad ***：（1） SSNCSs can detect lesions of compressive neuropathy in CubTS more precisely than the routine motor conduction studies.（2） SSNCSs can diagnose CubTS more sensitively than routine motor conduction studies.（3） In this study,we found that medial epicondyle to 2 cm above the medial epicondyle is the most vulnerable place that the ulnar nerve compressed.（4） The patients had a better prognosis who were abnormal in motor nerve conduction time only,but not amplitude in compressed lesions than those who were abnormal both in velocity and *** study suggests that SSNCSs is a practical method in detecting ulnar nerve compressed neuropathy,and sensitive in diagnosing *** compound muscle action potentials by SSNCSs may predict prognosis of CubTS.

关键词： Cubital Tunnel Syndrome Electrophysiology Short-segment Nerve Conduction Studies Ulnar Nerve

贵州南部泥盆系层序地层划分和层序地层格架的建立

在线全文

学校读者我要写书评

暂无评论

地质通报 2007年第2期26卷 206-214页

作者：刘智荣中国地质大学地质过程与矿产资源国家重点实验室

贵州南部的泥盆系为一个大型的楔状体。从深水背景的广西南丹罗富剖面到古陆边缘的贵阳乌当剖面,泥盆系由13个层序变薄尖灭成5个层序,这是泥盆纪早期海侵尖灭与晚期海退尖灭的结果。研究区泥盆系由海侵碎屑岩岩系到清水台地碳酸盐岩岩... 详细信息

贵州南部的泥盆系为一个大型的楔状体。从深水背景的广西南丹罗富剖面到古陆边缘的贵阳乌当剖面,泥盆系由13个层序变薄尖灭成5个层序,这是泥盆纪早期海侵尖灭与晚期海退尖灭的结果。研究区泥盆系由海侵碎屑岩岩系到清水台地碳酸盐岩岩系地层序列构成2个二级层序,又可进一步划分为13个三级层序。二级层序和三级层序均由其特殊的沉积相序列组成。研究区泥盆系层序地层划分和层序地层格架的建立提供了一个在年代地层与海平面变化框架内研究“相迁移”的良好实例。

关键词：层序地层泥盆系贵州南部

A confirmed asymptomatic carrier of 2019 novel coronavirus

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2020年第9期133卷 1123-1125页

作者： Si-Hui Luo Wei liu Zhen-Jun liu Xue-Ying Zheng Chang-Xing Hong zhi-rong liu Jian liu Jian-Ping Weng The First Affiliated Hospital of USTC Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui 230001China Joint Laboratory of Public Health University of Science and Technology of China and Health Commission of Anhui ProvinceHefeiAnhui 230026China Anqing Hospital Affiliated to Anhui Medical University(Anqing Municipal Hospital) AnqingAnhui 246003China Anhui Provincial Center for Disease Control and Prevention HefeiAnhui 230601China Division of Life Sciences and Medicine University of Science and Technology of ChinaHefeiAnhui 230026China

Since December 2019,the outbreak of infection caused by 2019 novel coronavirus(2019-nCoV)has become a major public health emergency *** 40%of the confirmed cases of 2019-nCoV infection(judged by positivity of viral RNA testing)were initially asymptomatic but later developed overt clinical symptoms of coronavirus disease-2019(COVID-19).[1]A presumed asymptomatic carrier of 2019-nCoV was also reported.[2]But her infection of 2019-nCoV was not fully *** far as we know,confirmed 2019-nCoV carriers but without overt clinical symptoms have been not yet reported.

关键词： asymptomatic infection

在线全文

学校读者我要写书评

暂无评论

天然无序蛋白质：序列-结构-功能的新关系

物理化学学报 2010年第8期26卷 2061-2072页

作者：黄永棋刘志荣北京大学化学与分子工程学院北京大学理论生物学中心北京分子科学国家实验室北京100871

天然无序蛋白质是一类新发现的蛋白质,它们在天然条件下没有确定的三维结构,却具有正常的生物学功能,广泛参与信号传递、DNA转录、细胞分裂和蛋白质聚集等重要的生理与病理过程.无序蛋白质的发现是对传统的蛋白质"序列-结构-功能"范式... 详细信息

天然无序蛋白质是一类新发现的蛋白质,它们在天然条件下没有确定的三维结构,却具有正常的生物学功能,广泛参与信号传递、DNA转录、细胞分裂和蛋白质聚集等重要的生理与病理过程.无序蛋白质的发现是对传统的蛋白质"序列-结构-功能"范式的挑战.在这篇综述里,我们首先回顾了蛋白质的传统范式以及无序蛋白质的发现过程,然后介绍无序蛋白质在结构、序列、功能等方面的特征与相互作用,并以分子识别过程为例,进一步阐述目前国际上对无序蛋白质所具有优势的一些认识与观点.我们还分析了无序蛋白质研究在生命科学和医学等领域的应用前景,并介绍了国内在无序蛋白质领域的研究现状.

关键词：天然无序蛋白质蛋白质折叠蛋白质相互作用分子识别蛋白质结构预测药物设计

Error Analysis and Its Offset on the NC Lathe Machine in Cutting a Semi-Sphere Surface

在线全文

学校读者我要写书评

暂无评论

International Journal of Plant Engineering and Management 2007年第4期12卷 221-226页

作者： ZHENG Yu-cai LI Cheng-zhi liu Chang-rong liu Tao GUO Xiu-hua Department of Mechanical and Electronic Engineering Hebei Normal University of Science ＆ Technology Qinhuangdao 066600 P. R. China

This paper analyzed the errors that occurred by leaving the shape of the cutting edge out of consideration on a NC lathe machine in cutting a semi-sphere surface and brought forward a method to offset these errors and the correct calculated formula for some parameters on the basis of experiments. It has increased the manufacturing accuracy of the semi-sphere surface on the NC lathe machine.

关键词： NC lathe machine semi-sphere error analysis

在线全文

学校读者我要写书评

暂无评论

pH和离子强度对泥煤吸附镍的影响

煤炭学报 2007年第8期32卷 854-859页

作者：刘峙嵘韦鹏曾凯东华理工学院应用化学系江西抚州344000

为了更好地使泥煤用来修复含镍废水,采用批次法研究了pH、离子强度以及不同阴阳离子对泥煤吸附镍的影响.实验表明,pH是影响吸附的重要因素,随pH的增加镍吸附量增大,反应速率也增大.Elovich方程和动力学二级方程可以描述泥煤吸附Ni2+的... 详细信息

为了更好地使泥煤用来修复含镍废水,采用批次法研究了pH、离子强度以及不同阴阳离子对泥煤吸附镍的影响.实验表明,pH是影响吸附的重要因素,随pH的增加镍吸附量增大,反应速率也增大.Elovich方程和动力学二级方程可以描述泥煤吸附Ni2+的动力学过程.随离子强度的增大,泥煤对镍的平衡吸附量减小,平衡吸附量减小的程度也变小.阳离子对吸附影响的顺序为:过渡金属>碱土金属>碱金属;阴离子对镍吸附也有一定影响.

关键词：泥煤镍吸附 pH 离子强度

在线全文

学校读者我要写书评

暂无评论

文学的《家》与历史的“家”

复旦学报（社会科学版） 2009年第6期51卷 36-47页

作者：刘志荣复旦大学中文系上海200433

本文对照巴金小说《家》及其材料原型,发现"文学的《家》"与"历史的‘家’"形成了典型的叙述复调,由此探讨文学文本所采取的形式策略、编码规则及其背后的意识形态预设,以及在20世纪中国何以"历史"经常比"文学"更丰富的原因。

关键词：巴金《家》文学历史双重叙述