Study on financing guarantee system for small and medium-sized enterprises in china

在现代经济中，无论是发达国家还是发展中国家，中小企业都是国民经济的重要组成部分，它们在经济和社会中发挥着不可或缺的作用。建立中小企业担保体系，缓解中小企业融资难问题，是各国政府扶持中小企业发展的通行做法。我国虽然也建立了中小企业担保体系，但是由于起步晚，环境建设不完善，以及缺乏相关的人才及经验，所以在实践中还存在着种种不足。因此本文旨在对国内现状分析的基础上，结合国外的先进经验，研究如何建立和完善我国中小企业融资担保体系。根据这一想法，本文将从五个方面系统地研究这一问题。第一，研究的选题背景、现实意义及解决途径；研究的范围及方法；相关概念和适用范围。第二，运用中小企业服务论、信用理论和担保理论...Abstract China’s city commercial banks were created during 1990s by the city government through the active merging and restructuring of China’s 5,000 or more urban credit cooperatives, so far they have gone a long way and played a vital role in China’s financial system with just more than ten-year development. Recently, on the strength of both the local governments and regulators, lots of city com...学位：经济学硕士院系专业：经济学院财政金融系_金融学(含保险学)学号：2005130092

川桑葚中鞣酸的提取及纯化工艺研究

对脱除多糖的桑葚干燥粉末先用N,N—二甲基甲酰胺提取鞣酸,再用石油醚和正丁酸甲酯萃取3次后获得鞣酸粗品。鞣酸粗品经酸沉、醇沉和重结晶3种方法纯化,采用单因素试验与正交试验优选鞣酸提取工艺和纯化工艺。结果发现:最佳提取工艺条件为N,N-二甲基甲酰胺与川桑葚质量比12∶1、石油醚与正丁酸甲酯体积比3∶1、提取温度40℃、提取时间8 h;最佳纯化工艺条件为酸沉时间16 h、醇沉时间4 h、重结晶温度50℃

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养殖乌鳢类立克次体感染的组织病理学研究

本文系统报道了养殖乌鳢类立克次体(Rickettsia-like organism,RLO)感染的各器官(脑、眼、鳃、心脏、头肾、肝、胰腺组织、脾、肾、肠和卵巢)的组织病理变化,探讨了炎症发展的基本规律。感染乌鳢病理解剖学特征和最具病理诊断意义的是体内各器官普遍出现的白色结节。这些结节的显微结构为肉芽肿炎症即一种慢性增生性炎症。在严重病变的肾脏,由于组织坏死区域较大和周围明显的细胞增生形成了境界较为清楚的巨大“肉瘤”状肿物。内脏器官的血管(特别是造血器官的血管)出现明显纤维素性血栓、混合血栓、弥散性血管

新疆紫草细胞大量培养生产紫草宁衍生物

该项研究在对各种理化因子对新疆紫草细胞的生长和紫草宁衍生物形成的影响，以及细胞生长和次生产物合成的相关性作了较系统研究的基础上，成功地建成了适合于新疆紫草细胞生长和次生产物形成的二步培养系统;通过二步筛选法获得了５个高产细胞系;采用悬浮培养方法获得细胞生长的最高月产率为２２．０克千重／升，其紫草宁衍生物最高含量比原植物根中的含量高４－５倍;成功地进行了１０升反应器的发酵培养，生物量达９．４７克干重／升／月，色素含量达到培养干重的１４．２６％;证明了培养物中的５种紫草宁衍生物与天然产物的化学结构完全一致;首次较系统地进行了紫草宁衍生物的抗菌、抗癌的药理试验，并进行３种质的超低温保存的研究

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies