检索结果-南通市图书馆

Theoretical Analysis and Experimental Study on Breakaway Torque of Large-diameter Magnetic Liquid Seal at Low Temperature

引用

Chinese Journal of Mechanical Engineering 2013年第4期26卷 695-700页

作者： zhang haina LI Decai WANG Qinglei zhang Zhili School of Mechanical Electronic and Control EngineeringBeijing Jiao Tong University

The existing researches of the magnetic liquid rotation seal have been mainly oriented to the seal at normal temperature and the seal with the smaller shaft diameter less than 100 mm. However, the large-diameter magnetic liquid rotation seal at low temperature has not been reported both in theory and in application up to now. A key factor restricting the application of the large-diameter magnetic liquid rotation seal at low temperature is the high breakaway torque. In this paper, the factors that influence the breakaway torque including the number of seal stages, the injected quantity of magnetic liquid and the standing time at normal temperature are studied. Two kinds of magnetic liquid with variable content of large particles are prepared first, and a seal feedthrough with 140 mm shaft diameter is used in the experiments. All experiments are carried out in a low temperature chamber with a temperature range from 200℃ to -100℃. Different numbers of seal stages are tested under the same condition to study the relation between the breakaway torque and the number of seal stages. Variable quantity of magnetic liquid is injected in the seal gap to get the relation curve of the breakaway torque and the injecting quantity of magnetic liquid. In the experiment for studying the relation between the breakaway torque and the standing time at the normal temperature, the seal feedtrough is laid at normal temperature for different period of time before it is put in the low temperature chamber. The experimental results show that the breakaway torque is proportional to the number of seal stages, the injected quantity of magnetic liquid and the standing time at the normal temperature. Meanwhile, the experimental results are analyzed and the torque formula of magnetic liquid rotation seal at low temperature is deduced from the Navier-Stokes equation on the base of the model of magnetic liquid rotation seal. The presented research can make wider application of the magnetic liquid seal

关键词： magnetic liquid breakaway torque low temperature large-diameter

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

Complexity absorption： a processual strategic approach to corporate entrepreneurship strategy

引用

Frontiers of Business Research in China 2017年第3期11卷 374-399页

作者： haina zhang Lancaster University Management School Lancaster UniversityLancaster LA1 4YX UK

In contrast to traditional strategic approaches that are based on complexity reduction, this paper aims to develop an alternative way of understanding entrepreneurial strategy and managing complexity from a processual perspective. The new perspective is developed from a processual perspective integrating insights from an understanding of complexity to engage with philosophical accounts of Chinese processual thought particularly as it is applied to entrepreneurial strategy. The new theoretical framework is empirically investigated through case studies of 30 entrepreneurial organizations in China. The findings confirm that timing and action, context/situation, and efficacy are the three key components in complexity absorption as preferred entrepreneurial strategic approaches.

关键词： Complexity absorption Entrepreneurial strategy Chinese processual philosophy

来源：

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

Fast correlation attack on streamcipher ABC v3

引用

Science in China(Series F) 2008年第7期51卷 936-947页

作者： zhang haina LI Lin WANG XiaoYun Key Laboratory of Cryptographic Technology and Information Security Ministry of Education ShandongUniversity Jinan 250100 China Center for Advanced Study Tsinghua University Beijing 100084 China

ABC v3 is a stream cipher submitted to the ECRYPT eStream project and has entered the second evaluation phase. Its key length is 128 bits. In this paper, we find large numbers of new weak keys of ABC family and introduce a method to search for them, and then apply a fast correlation attack to break ABC v3 with weak keys. We show that there are at least 2^103.71 new weak keys in ABC v3. Recovering the internal state of a weak key requires 236.05 keystream words and 2^50.56 operations. The attack can be applied to ABC vl and v2 with the same complexity as that of ABC v3. However, the number of weak keys of ABC vl as well as ABC v2 decreases to 2^97 ＋ 20^95.19,It reveals that ABC v3 incurs more weak keys than that of ABC vl and v2.

关键词： cryptanalysis stream cipher fast correlation attack ABC v3

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

Response of root traits of Reaumuria soongorica and Salsola passerina to facilitation

引用

Journal of Arid Land 2014年第5期6卷 628-636页

作者： haina zhang PeiXi SU ShanJia LI ZiJuan ZHOU TingTing XIE Linze Inland River Basin Research Station Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Chinese Academy of Sciences

C3 plant Reaumuria soongorica and C4 plant Salsola passerina are super xerophytes and coexist in a mixed community in either isolated or associated growth, and interspecific facilitation occurs in associated growth. In the present study, the root traits including root distribution, root length（RL）, root surface area（RSA）, root weight（RW） and specific root length（SRL） of both species in two growth forms were investigated to clarify their response to facilitation in associated growth. Six isolated plants of each species, as well as six associated plants similar in size and development were selected during the plant growing season, and their roots were excavated at 0–10, 10–20, 20–30, 30–40 and 40–50 cm soil depths at the end of the growing season. All the roots of each plant were separated into the two categories of fine roots（2 mm diameter） and coarse roots（≥2 mm diameter）. Root traits such as RL and RSA in the fine and coarse roots were obtained by the root analyzing system WinRHIZO. Most of the coarse roots in R. soongorica and S. passerina were distributed in the top 10 cm of the soil in both growth forms, whereas the fine roots of the two plant species were found mainly in the 10–20 and 20–30 cm soil depths in isolated growth, respectively. However, the fine roots of both species were mostly overlapped in 10–20 cm soil depth in associated growth. The root/canopy ratios of both species reduced, whereas the ratios of their fine roots to coarse roots in RL increased, and both species had an increased SRL in the fine roots in associated growth. In addition, there was the increase in RL of fine roots and content of root N for S. passerina in associated growth. Taken together, the root growth of S. passerina was facilitated for water and nutrient exploration under the interaction of the overlapped roots in both species in associated growth, and higher SRL allowed both species to more effectively adapt to the infertile soil in the desert ecosystem.

关键词： C3 plant C4 plant facilitation relationship root traits specific root length

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

Two new high-temperature molecular ferroelectrics[1,5-3.2.2-Hdabcn]X(X=ClO_(4)^(-),ReO_(4)^(-))

引用

Chinese Chemical Letters 2024年第6期35卷 234-238页

作者： Keke Han Wenjun Rao Xiuli You haina zhang Xing Ye Zhenhong Wei Hu Cai School of Chemistry and Chemical Engineering Nanchang UniversityNanchang 330031China Jiangxi Key laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China

Molecular ferroelectrics have attracted much attention because of their excellent piezoelectricity,mechanical workability,and second harmonic ***,we successfully prepared two molecular ferroelectrics[1,5-3.2.2-Hdabcn]X(X=ClO_(4)^(-),1;ReO_(4)^(-),2)by reactions of a quasi-spherical amine 1,5-diazabicycle[3.2.2]nonane(1.5-3.2.2-dabcn)with HX aqueous *** 1 and 2 undergo hightemperature phase transitions at 381 K(1)and 396 K(2).Before and after the phase transition,they crystallize in the polar point group mm2,and the centrosymmetric point groups mmm and 4/mmm,*** to Aizu rules,these two compounds experience mmm Fmm2 and 4/mmm Fmm2 type ferroelectric phase transitions,*** ferroelectricity of both compounds is well expressed in their polycrystalline film at room temperature with low coercive voltages of 13 V for 1 and 25 V for *** piezoelectric force microscopy(PFM),the 180°anti-parallel ferroelectric domains and the reversible polarization switching can be clearly observed in 1 and *** high-temperature molecular ferroelectric material has great application potential in flexible materials,biomechanics,intelligent wearables and other fields.

关键词： Ferroelectric domains Quasi-spherical amine Phase transition Polarization

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

Contextualizing Transformational Leadership Theories in China： A Confucian Perspective

引用

Frontiers of Business Research in China 2013年第2期7卷 189-218页

作者： haina zhang Malcolm H. Cone Andre M. Everett Graham Elkin Adam Smith Business School University of Glasgow Glasgow G 12 8QQ UK Commerce Faculty Lincoln University Lincoln 7647 Christchurch New Zealand Department of Management University of Otago Dunedin 9054 New Zealand

Transformational leadership, though widely studied in the literature, lacks sufficient contextual analysis of its essential leadership process and differences in characteristic behaviors under different cultural settings, especially in the Asian context. This research, through qualitative data collected from eight Chinese organizations （four state-owned enterprises and four private-owned enterprises）, empirically examines the Western transformational leadership theory in China. Moreover, by studying Chinese leaders＇ daily behaviors, we develop a transformational leadership theory in the Chinese business context. This research contributes to contextualizing transformational leadership behaviors and providing deep insights into the Chinese transformational leadership process from a philosophical perspective. Findings can be applied to both Chinese and Western management studies as well as the World of business practice.

关键词： China Confucianism transformational leadership

来源：

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

Species diversity and its relation with soil factors under different site conditions in a desert-oasis ecotone

引用

Research in Cold and Arid Regions 2013年第3期5卷 331-338页

作者： TingTing Xie PeiXi Su ZiJuan Zhou ShanJia Li haina zhang Linze Inland River Basin Research Station/Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Linze Inland River Basin Research Station/Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

Vegetation and soil surveys were conducted under different site conditions in 2007-2011 to study species diversity using richness, evenness and diversity indices, in the middle portion of the Heihe River Basin. The relationship between species distribution and soil environmental factors was also studied by Canonical Correspondence Analysis （CCA）. Results show that vegetation coverage and species diversity were the highest in the interdune lowland, and the lowest in the mobile dime. Results of the Hill＇s index （di- versity ordering） shows that species diversity is reduced along decreasing soil water content, and the order of species diversity was interdune lowland, flat slope, fixed dune, semifixed dune and mobile dune. The influence degree of soil factors on vegetation dis- tribution was soil water content 〉 pH 〉 total K 〉 organic matter 〉 available N 〉 total N 〉 available K 〉 total P 〉 saline content 〉 available P. Soil water content and pH were important factors significantly affecting spatial distribution difference of vegetation, the environmental explanation was 98%.

关键词： desert-oasis ecotone species diversity soil factor canonical correspondence analysis

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 time titration treatment of five cases of human infection with highly pathogenic avian influenza(H7N9 and H1N1)

The time titration treatment of five cases of human infectio...

引用

中华医学会第二届重症心脏全国学术大会暨第三届西湖重症医学论坛、2015年浙江省重症医学学术年会

作者： Xiaomin zhang haina zhang Jingye Pan Department of the First Clinical Medical The First Affiliated Hospital of Wenzhou Medical Univ ersity Department of Pharmacy The First Affiliated Hospital of Wenzhou Medical University Department of Intensive Care Unit The First A ffiliated Hospital of Wenzhou Medical University

Avian influenza is one of the most severe infectious diseases caused by the influenza A virus,and it is characterised by a rapid progression to severe *** and poultry have a role in the spread of this *** diagnosis of avian influenza is by clinical evidence and reverse transcription-polymerase chain reaction *** recently treated five patients,including four infected with H7N9 and one with H1N1;four of the patients were cured..The patients'clinical manifestations were similar and included hyperpyrexia,cough,anoxia and rapid progression to severe *** leukocyte and blood platelet levels were shown in the laboratory *** case report describes the"time titration"treatment of four Chinese patients infected with H7N9 and one with H1N1.

关键词： avian influenza H7N9 H1N1 Time titration treatment

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

Influences of different time intervals between loop electrosurgical excision and abdominal hysterectomy or radical hysterectomy on postoperative complications: a retrospective analysis

引用

Journal of Medical Colleges of PLA(China) 2010年第1期25卷 38-43页

作者： Qu haina zhang Yan zhang Junjie Hui Ning Xu Mingjuan Department of Obstetrics and Gynecology Changhai Hospital Second Military Medical University Shanghai 200433 China

Objective： To study the influences of different time intervals between loop electrosurgical excision （LEEP） and abdominal hysterectomy or radical hysterectomy on postoperative complications. Methods： Sixty-eight patients, who received subsequent abdominal hysterectomy or radical hysterectomy after LEEP due to C1N III and cervical cancer （IA1, IA2 and IB1）, were included in the present study. The hospital and clinic records of these patients were reviewed. The patients were divided into three groups according to the time intervals between LEEP and hysterectomy or radical hysterectomy： group l（within 48 h）, group 2 （between 48 h to 6 weeks）, and group 3（〉 6 weeks ）.Results： General characteristics of patients, including the mean age, delivery history, BMI, menopausal status, clinical stage and HPV infection, were comparable between patients of different groups. There were no significant differences in the mean transfusion amount, posthysterectomy hospital stay or operation time between different groups. The frequencies and spectrum of complications were not significantly affected by the time interval between LEEP and hysterectomy or radical hysterectomy. Conclusion： It is concluded that whenever the LEEP is done, the operation including hysterectomy or radical hysterectomy can be conducted at any time as it is necessary for the patients.

关键词： LEEP Hysterectomy Radical hysterectomy Time interval CIN III Early cervical cancer

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

渤海湾盆地埕岛油田馆上段沉积相研究

引用

石油实验地质 2007年第1期29卷 52-56页

作者：张海娜中国石油化工股份有限公司胜利油田分公司地质科学研究院山东东营257015

渤海湾盆地埕岛油田是我国极浅海地区第一个投入开发的大油田。综合应用沉积岩石学、地质学等多学科理论,从岩心描述入手,结合区域地质背景、岩心分析和测井等资料,全面分析了埕岛油田馆上段的岩石学特征、沉积构造特征、测井曲线特征... 详细信息

渤海湾盆地埕岛油田是我国极浅海地区第一个投入开发的大油田。综合应用沉积岩石学、地质学等多学科理论,从岩心描述入手,结合区域地质背景、岩心分析和测井等资料,全面分析了埕岛油田馆上段的岩石学特征、沉积构造特征、测井曲线特征和古生物特征等,确定了该区馆上段砂岩为河流相沉积,并运用多种河相判别参数对埕岛油田馆上段储层进行判别,进一步确定了该储层的亚相类型为曲流河,在此基础上总结了4种沉积微相特征和主力小层古水流方向,并对不同沉积微相的开发特征和开发效果进行了评价。

关键词：相标志沉积相砂岩馆上段埕岛油田渤海湾盆地

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：