检索结果-南通市图书馆

当代亚太 2007年第2期 44-51页

作者：庄芮对外经济贸易大学国际经济研究院

中国和印度同为亚洲发展中大国,20世纪末以来,两国都在加强各自的区域经济合作。本文分析了中国和印度参与区域经济合作的现状,并对中印参与区域经济合作的特点进行了比较,探讨了二者的共性与不同。

关键词：区域经济合作中国印度

Non-Rayleigh photon statistics of superbunching pseudothermal light

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第2期31卷 366-371页

作者： Chao-Qi Wei Jian-Bin Liu Xue-Xing Zhang rui zhuang Yu Zhou Hui Chen Yu-Chen He Huai-Bin Zheng Zhuo Xu Key Laboratory of Mulifunctional Materials and Structures.Ministry of Education&International Center for Dielectric Research School of Electronic Science and Engineering.Xi an Jiaotong UniversityXi'an 710049China The Key Laboratory of Weak Light Nonlinear Photonics(Ministry of Education) Namkai UniversityTianjin 300457China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Department of Applied PlhysicsXi'an Jiaotong UniversityXi'an 710049China

Superbunching pseudothermal light has important applications in studying the second-and higher-order interference of light in quantum *** the photon statistics of thermal or pseudothermal light is well understood,the photon statistics of superbunching pseudothermal light has not been studied *** this paper,we will employ single-photon detectors to measure the photon statistics of superbunching pseudothermal light and calculate the degree of second-order *** is found that the larger the value of the degree of second-order coherence of superbunching pseudothermal light is,the more the measured photon distribution deviates from the one of thermal or pseudothermal light in the tail *** results are helpful to understand the physics of two-photon superbunching with classical *** is suggested that superbunching pseudothermal light can be employed to generate non-Rayleigh temporal speckles.

关键词： superbunching pseudothermal light photon statistics two-photon interference

在线全文

学校读者我要写书评

暂无评论

质疑“普雷维什-辛格命题”

世界经济研究 2006年第9期 19-23页

作者：庄芮对外经济贸易大学国际经济研究院

“普雷维什-辛格命题”,即“发展中国家贸易条件长期恶化”的论断,自20世纪50年代提出,一直是国际经济学界争论的一个焦点。本文首先指出,完整的贸易条件概念应该全面包含价格贸易条件(NBTT)、收入贸易条件(ITT)和要素贸易条件(FTT)。... 详细信息

“普雷维什-辛格命题”,即“发展中国家贸易条件长期恶化”的论断,自20世纪50年代提出,一直是国际经济学界争论的一个焦点。本文首先指出,完整的贸易条件概念应该全面包含价格贸易条件(NBTT)、收入贸易条件(ITT)和要素贸易条件(FTT)。文中质疑“普雷维什-辛格命题”主要涉及价格贸易条件,针对“普雷维什-辛格命题”及其种种理论争议,整理和分析了20世纪70年代以来,经济全球化条件下发展中国家的价格贸易条件数据。结果发现,实证数据并不支持“普雷维什-辛格命题”:从长期趋势看,发展中国家的价格贸易条件总体应该是改善,而非“恶化”。本文认为,在学界对发展中国家价格贸易条件长期趋势所作的判断方面,古典经济学家的观点更适用于长期或一般分析,而“普雷维什-辛格命题”则更适用于短期或局部分析。

关键词： “普雷维什-辛格命题” 贸易条件发展中国家

Large-aperture Telescope Tracking Control Based on Time-synchronization Strategy

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第3期24卷 34-46页

作者： Yun Li Yu Ye Shi-Hai Yang Ling-Zhe Xu Jin Xu Hai Wang zhuang-zhuang Deng rui-Qiang Liu Xiao-Jie Gu Bo-Zhong Gu Nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing 210042China CAS Key Laboratory of Astronomical Optics&Technology Nanjing Institute of Astronomical Optics&TechnologyNanjing 210042China University of Chinese Academy of Sciences Beijing 100049China

A time-synchronization strategy for packetized transmission of target position about a large-aperture telescope observation control system has been proposed in this *** with the existing telescope tracking strategy,the target position packing and sending strategy based on the time synchronization method proposed in this paper has the advantages of high stability and ***,the telescope tracking observation control method was elaborated in this paper,including the motion pattern during telescope ***,the strategy for packetizes transmission of target positions based on time-synchronization is established and lists the detailed ***,the performance of the tracking strategy is verified using the 2.5 m telescope for the simulated uniform speed star and the blind-tracking fixed star HIP 31216,*** test results show that the accuracy root mean square of the tracking strategy proposed in this paper is less than 0".02 at 30 minutes,and the performance is much better than the design requirement of 0".*** most important advantage of this tracking strategy is that the telescope can guarantee normal tracking for a certain period of time even if the hardware or software of the host computer is abnormal.

关键词： miscellaneous-telescopes-methods observational-methods analytical

在线全文

学校读者我要写书评

暂无评论

我国重要原材料进口现状及对经济安全的影响

国际经贸探索 2005年第4期21卷 13-16页

作者：庄芮对外经济贸易大学国际经济研究院北京100029

我国钢材及铁矿的进口现状对我国经济安全的影响有:目前我国钢材进口增长主要集中于高端产品,是在品种结构上补充我国市场,总体不会影响国家经济安全;我国铁矿日益依赖进口,该“资源短缺”矿产进口一方面保障了我国经济安全,但另一方面... 详细信息

我国钢材及铁矿的进口现状对我国经济安全的影响有:目前我国钢材进口增长主要集中于高端产品,是在品种结构上补充我国市场,总体不会影响国家经济安全;我国铁矿日益依赖进口,该“资源短缺”矿产进口一方面保障了我国经济安全,但另一方面也增加了潜在风险。

关键词：钢材进口铁矿进口经济安全

Process and Techniques in Developing General Management Plan for Meili Snow Mountains National Park of China

在线全文

学校读者我要写书评

暂无评论

中国园林 2007年第4期 7-8页

作者： YANG rui, zhuang You-bo, DANG An-rong

Meili Snow Mountains (Meili) are sitting at Deqin County, Diqing Tibetan Autonomous State in the extreme edge of Northwest Yunnan Province, and are part of the Three Parallel Rivers World Heritage which is typical of multiple mountainous landforms and the most compressed and extruded gigantic complex orogen across the world, therefore reflects milestones in the evolution of the Earth[1].

关键词： Process and Techniques in Developing General Management Plan for Meili Snow Mountains National Park of China VERP

CT评分系统联合MPV、RDW对急性胰腺炎患者预后的预测价值

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

临床医学研究与实践 2024年第20期9卷 18-21页

作者：刘蕃荔洪英张宏曹媛媛龚喆嘉雷方王卓庄瑞陕西省勉县医院陕西汉中724200 汉中市中心医院陕西汉中723000

目的分析CT评分系统联合平均血小板体积(MPV)、红细胞分布宽度(RDW)对急性胰腺炎患者预后的预测价值。方法选取2019年6月至2022年6月收治的106例急性胰腺炎患者进行回顾性分析,根据预后情况将其分为死亡组(16例)和存活组(90例)。比较两... 详细信息

目的分析CT评分系统联合平均血小板体积(MPV)、红细胞分布宽度(RDW)对急性胰腺炎患者预后的预测价值。方法选取2019年6月至2022年6月收治的106例急性胰腺炎患者进行回顾性分析,根据预后情况将其分为死亡组(16例)和存活组(90例)。比较两组的一般资料及实验室指标;分析CT评分系统联合MPV、RDW对急性胰腺炎患者预后的预测效能。结果死亡组的急性生理学与慢性健康状况评分系统Ⅱ(APACHEⅡ)、改良CT严重指数(MCTSI)评分及MPV、RDW高于存活组(P<0.05)。Logistic回归分析显示,APACHEⅡ、MCTSI评分、MPV、RDW是急性胰腺炎患者预后不良的危险因素(P<0.05)。CT评分系统、MPV、RDW联合预测急性胰腺炎患者预后的准确度、灵敏度、特异度明显高于CT评分系统及MPV、RDW(P<0.05)。结论CT评分系统联合MPV、RDW对急性胰腺炎患者预后的预测价值较高。

关键词： CT评分系统急性胰腺炎平均血小板体积红细胞分布宽度

Electrochemical converting ethanol to hydrogen and acetic acid for large scale green hydrogen production

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第3期17卷 1542-1551页

作者： Yufeng Zhang Wei Zhu Jinjie Fang Zhiyuan Xu Yanrong Xue Jiajing Pei rui Sui Xingdong Wang Xuejiang Zhang Zhongbin zhuang State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Laboratory of Advanced Functional Materials of Nanjing Nanjing Xiaozhuang UniversityNanjing 211171China Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical TechnologyBeijing 100029China

Electrochemical coupling hydrogen evolution with biomass reforming reaction(named electrochemical hydrogen and chemical cogeneration(EHCC)),which realizes green hydrogen production and chemical upgrading simultaneously,is a promising method to build a carbon-neutral ***,we analyze the EHCC process by considering the market *** ethanol to acetic acid and hydrogen approach is the most feasible for large-scale hydrogen *** develop AuCu nanocatalysts,which can selectively oxidize ethanol to acetic acid(>97%)with high long-term *** isotopic and in-situ infrared experiments reveal that the promoted water dissociation step by alloying contributes to the enhanced activity of the partial oxidation reaction path.A flow-cell electrolyzer equipped with the AuCu anodic catalyst achieves the steady production of hydrogen and acetic acid simultaneously in both high selectivity(>90%),demonstrating the potential scalable application for green hydrogen production with low energy consumption and high profitability.

关键词： selective ethanol electrooxidation gold alloy catalyst electrochemical-coupled hydrogen production market assessment interfacial water activation

社交媒体青年用户迁徙行为影响因素研究——以QQ空间为例

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

新闻界 2020年第10期 22-31页

作者：庄睿于德山 Yang rui 南京师范大学新闻与传播学院江苏南京210024 School of Literature Fuyang Normal University

大数据时代社交媒体用户在不同平台之间迁徙流动已经成为一种常态,这种行为大多被归因于"社交媒体倦怠"(social media fatigue)。本文梳理了国内外相关研究,改变了以社交倦怠为原因导向的研究思路,对基于程度差异的消极使用行为和基于... 详细信息

大数据时代社交媒体用户在不同平台之间迁徙流动已经成为一种常态,这种行为大多被归因于"社交媒体倦怠"(social media fatigue)。本文梳理了国内外相关研究,改变了以社交倦怠为原因导向的研究思路,对基于程度差异的消极使用行为和基于个体差异的特定用户群体展开研究,以QQ空间为研究对象,探究青年用户社交媒体迁徙行为背后的动因。研究发现,"身份转换"成为用户迁出QQ空间的主要原因,"旧内容"与"新关系"的交错互嵌导致隐私边界模糊、交流语境坍塌,并最终引发社交媒体迁徙现象。

关键词：社交媒体迁徙 QQ空间隐私边界扎根理论

Functional nanoemulsions: Controllable low-energy nanoemulsification and advanced biomedical application

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第2期35卷 57-69页

作者： Maojie Zhang Qiang Cao Yuming Yuan Xiaohan Guo Dawei Pan rui Xie Xiaojie Ju zhuang Liu Wei Wang Liangyin Chu College of Engineering Sichuan Normal UniversityChengdu 610101China School of Chemical Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065China

Nanoemulsions are widely used as advanced pharmaceutical delivery systems in biomedical field, due to their high encapsulation efficiency and good therapy *** techniques that produce nanoemulsions with controllable sizes and compositions are promising for creating advanced nanoemulsion systems for pharmaceutical *** review summarizes recent advances on low-energy emulsification techniques for producing nanoemulsions, and the use of these nanoemulsions as advanced pharmaceutical delivery systems and as templates to create drug-loaded functional particles for biomedical ***, nanoemulsification techniques that utilize elaborate interfacial physics/chemistry and micro-/nano-fluidics, featured with relatively-low energy input, to produce nanoemulsions with controllable sizes and compositions, are *** of these nanoemulsions to create nanoemulsionincorporated milli-particles, drug-loaded nanoparticles and nanoparticle-incorporated microparticles with sizes ranging from several millimeters to sub-10 nm are *** and efficient use of the nanoemulsions, functional nanoparticles and milli-/micro-particles integrated with nanoemulsions or nanoparticles for advanced pharmaceutical delivery in biomedical field are highlighted, with focus on how the interplay between their sizes and compositions achieve desired pharmaceutical-delivery ***, perspectives on further advances on the controllable production of nanoemulsions are provided.

关键词： Nanoemulsions Interfaces Drug delivery Template synthesis Nanoparticles