43 research outputs found

    Study on Negotiating Bank`s Legal Status under Documentary Credit Systems

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    议付行在跟单信用证交易流程中扮演了十分重要的角色,它极大地满足了出口方对交单便利和融资的要求。然而,议付行在信用证关系中的法律地位却一直处于模糊暧昧的状态。实务中人们经常要面对这样的困惑:向受益人提供融资的议付行能否获得开证行的偿付?如果遭受拒付,它能否向受益人追偿?议付行自身需要履行哪些义务以确保它的权利不受影响?这些问题如果得不到解决,将影响信用证交易方式的顺利开展,并最终影响到信用证制度的生命力。本文围绕议付行对开证行的索偿权和对受益人的追偿权这两个核心问题,结合关于信用证的现行法律、惯例、判例、通行的法理以及信用证交易的现实需要和自身机理,从实然和应然两个层面对议付行在信用证关系中的法...Negotiating banks play a very important role in documentary credit transaction. They successfully meet the requirement of exporters for the convenience of presenting documents to issuing banks and for finance. However, the legal status of negotiating banks under documentary credit system is still ambiguous up to now. People often have to face such confusions in practice that whether a negotiating ...学位:法学硕士院系专业:法学院法律系_国际法学(含国际公法、国际私法、国际经济法)学号:20020808

    Optimization of β-Cyclodextrin Inclusion Technology of Volatile Oil from Pueraria Compound by Orthogonal Design

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    目的优选葛根复方挥发油的包合工艺,提高制剂的稳定性。方法采用饱和水溶液法制备包合物,以挥发油中藁本内酯、桂皮醛、甲基丁香酚包合率及包合物得率为综合评价指标,采用正交试验法考察挥发油与β-环糊精的比例、包合时间、包合温度对包合工艺的影响,优化得到葛根复方中挥发油的最优包合工艺。结果葛根复方中挥发油的最佳包合工艺条件为挥发油与β-环糊精比例为1∶8,包合温度为30℃,包合时间为1h,验证试验中,藁本内酯、桂皮醛及甲基丁香酚的包合率为别为86.58%±0.009%,73.34%±0.001%,68.89%±0.020%,包合物得率为67.98%±0.047%。结论所确定的包合工艺挥发油的包合率高、工艺稳定可行。Objective To obtain the optimized technology of volatile oil from Pueraria Compound with β-Cyclodextrin( β-CD). Methods The inclusion compound was prepared by saturated peroxide solution method. In order to optimize inclusion technology,orthogonal design was performed,with the content of multi-target ingredient,such as ligustilide,cinnamic aldehyde,methyleugenol and the yield of inclusion as comprehensive evaluation indexes. Three factor was performed,the ratio of volatile oil( m L) to β-CD( g),the inclusion temperature and the inclusion time. Results The optimum conditions for inclusion process were as follow: the ratio of volatile oil( m L) to β-CD( g) was 1: 8,the inclusion temperature was 30℃ and the inclusion time was 1h. With the optimum inclusion condition,the content of ligustilide,cinnamic aldehyde and methyleugenol and the yield of inclusion were 86. 58% ± 0. 009%,73. 34% ± 0. 001%,68. 89% ± 0. 020%,and 67. 98% ± 0. 047%,respectively.Conclusion The optimum inclusion condition was stable and reproducible with a high inclusion yield.国家自然科学基金(No.81270901);上海市教委基金(No.15cxy21

    微乳薄层色谱法鉴别甘草的研究

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    国家自然科学基金重点项目(20235020

    CuCe1-xMnxOy复合氧化物催化氧化碳烟颗粒性能的研究

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    利用反向共沉淀法合成CuCe1-xMnxOy复合氧化物催化剂,X射线衍射分析(XRD)和拉曼(Raman)表征结果表明,反向共沉淀法可以将Cu、Mn离子在CeO2晶格中有效掺杂并形成晶体粒径较小的固溶体。程序升温还原(H2-TPR)与X射线光电子能谱(XPS)表征结果表明,Cu、Mn、Ce之间存在强相互作用,有效提升了氧化物的氧化还原性能。所合成的CuCe1-xMnxOy复合氧化物系列催化剂在碳烟颗粒催化氧化中均表现出良好的反应活性,其中CuCe0.8Mn0.2催化剂表现出最佳活性,T50仅为354℃,并且在循环测试中也基本保持稳定。福建省自然科学基金(2015J05033)厦门大学校长基金(20720170043

    Impactfactors and optimization method on the separation of active components in licorice by micellar thin layer chromatography

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    第一作者Tel: 15012701322; E-mail: [email protected][中文文摘]目的:为甘草的胶束薄层色谱指纹图谱寻找最优胶束流动相。方法:首先采用单因子法,寻找影响甘草胶束薄层色谱的影响因素,在此基础上,采用控制加权可变步长单纯形优化法进行甘草胶束薄层色谱指纹图谱的流动相优化。结果:对甘草的胶束薄层色谱分离条件(表面活性剂的种类和含量、醇和酸改性剂的影响等)进行了实验,表明纯胶束薄层色谱的柱效较低,加入醇和酸类改性剂后柱效有明显提高。通过对改性胶束的进一步优化(控制加权可变步长单纯形优化法),得到优化的甘草改性胶束展开剂组成为:0.23 mol.L-1的SDS+16%(v/v)正丁醇+11%(v/v)甲酸。本研究对胶束薄层色谱的一些分离机理亦进行了探讨。结论:胶束薄层色谱的表面活性剂和各添加剂间存在交互作用,需采用合适的优化方法,才能达到分离中药材复杂活性成分群的目的。[英文文摘]Objective: To seek the best mobile phase of micellar thin-layer chromatography(MTLC)of licorice fingerprint.Method: Single impact factor of mobile phase in licorice MTLC fingerprint was tested individually and controlled weighted centroid simplex method was used finally to optimize the mobile phase of licorice MTLC fingerprint.Results: The selectivity of micellar TLC was studied for the separation of active components in licorice under various operation variables including concentrations of surfactant and co-surfactant,surfactant type,addition of acid modifier,et al.The results show that the low chromatography efficiency of micellar TLC could be improved by the addition of alcohol and acid modifier.Using controlled weighted centroid simplex ethod,optimization micellar TLC developing system of licorice was achieved which consists of 0. 23 mol·L-1 SDS,16%( v /v) n -butanol and 11% ( v /v) methyl acid.In addition,the separation mechanism of micellar TLC was also discussed.Conclusion:he appropriate optimization method should be tried to get the reliable mobile phase for the alternate impact of several parameters in MTLC国家自然科学基金资助项目(No.20235020

    Impactfactors and optimization method on the separation of active components in licorice by micellar thin layer chromatography

    Get PDF
    第一作者Tel: 15012701322; E-mail: [email protected][中文文摘]目的:为甘草的胶束薄层色谱指纹图谱寻找最优胶束流动相。方法:首先采用单因子法,寻找影响甘草胶束薄层色谱的影响因素,在此基础上,采用控制加权可变步长单纯形优化法进行甘草胶束薄层色谱指纹图谱的流动相优化。结果:对甘草的胶束薄层色谱分离条件(表面活性剂的种类和含量、醇和酸改性剂的影响等)进行了实验,表明纯胶束薄层色谱的柱效较低,加入醇和酸类改性剂后柱效有明显提高。通过对改性胶束的进一步优化(控制加权可变步长单纯形优化法),得到优化的甘草改性胶束展开剂组成为:0.23 mol.L-1的SDS+16%(v/v)正丁醇+11%(v/v)甲酸。本研究对胶束薄层色谱的一些分离机理亦进行了探讨。结论:胶束薄层色谱的表面活性剂和各添加剂间存在交互作用,需采用合适的优化方法,才能达到分离中药材复杂活性成分群的目的。[英文文摘]Objective: To seek the best mobile phase of micellar thin-layer chromatography(MTLC)of licorice fingerprint.Method: Single impact factor of mobile phase in licorice MTLC fingerprint was tested individually and controlled weighted centroid simplex method was used finally to optimize the mobile phase of licorice MTLC fingerprint.Results: The selectivity of micellar TLC was studied for the separation of active components in licorice under various operation variables including concentrations of surfactant and co-surfactant,surfactant type,addition of acid modifier,et al.The results show that the low chromatography efficiency of micellar TLC could be improved by the addition of alcohol and acid modifier.Using controlled weighted centroid simplex ethod,optimization micellar TLC developing system of licorice was achieved which consists of 0. 23 mol·L-1 SDS,16%( v /v) n -butanol and 11% ( v /v) methyl acid.In addition,the separation mechanism of micellar TLC was also discussed.Conclusion:he appropriate optimization method should be tried to get the reliable mobile phase for the alternate impact of several parameters in MTLC国家自然科学基金资助项目(No.20235020

    贫困家庭的金融选择:基于社会资本视角的分析

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    本文旨在研究社会资本视角下贫困家庭的金融选择问题,重点关注社会资本对于贫困家庭改善金融状况、缓解贫困的作用。在对我国贫困家庭入户调查的基础上,实证分析三个问题——社会资本的测度、社会资本对贫困家庭金融选择的影响和城乡差异,研究证实通过社会资本改善贫困家庭金融状况是反贫困的重要途径,由此提出建议:第一,充分发挥政府在改善贫困家庭金融方面的主导作用,重视社会资本投入;第二,充分发挥金融中介作用,在贫困家庭信用担保中更多地考虑社会资本的作用;第三,规范民间非正规金融发展,积极发挥社会资本在民间借贷中的重要作用。国家自然科学基金项目“社会资本视角下政府反贫困政策绩效管理的理论与实证研究”(批准号:70873097)|国家社科基金项目“社会资本的宏观测度及其应用研究”(批准号:08XTJ003)|教育部人文社科基地重大项目“网络舆论、市场效应与金融稳定机制创新”(批准号:12JJD790026)的资

    Optimization of beta - Cyclodextrin Inclusion Technology of Volatile Oil from Pueraria Compound by Orthogonal Design

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    目的优选葛根复方挥发油的包合工艺,提高制剂的稳定性。方法采用饱和水溶液法制备包合物,以挥发油中藁本内酯、桂皮醛、甲基丁香酚包合率及包合物得率为综; 合评价指标,采用正交试验法考察挥发油与beta; -环糊精的比例、包合时间、包合温度对包合工艺的影响,优化得到葛根复方中挥发油的最优包合工艺。结果葛根复方中挥发油的最佳包合工艺条件为挥发油与be; ta -环糊精比例为1:8,包合温度为30℃,包合时间为1h,验证试验中,藁本内酯、桂皮醛及甲基丁香酚的包合率为别为86.58% ; 0.009%,73.34% 0.001%,68.89% 0.020%,包合物得率为67.98% ; 0.047%。结论所确定的包合工艺挥发油的包合率高、工艺稳定可行。Objective To obtain the optimized technology of volatile oil from; Pueraria Compound with beta - Cyclodextrin (beta - CD). Methods The; inclusion compound was prepared by saturated peroxide solution method.; In order to optimize inclusion technology,orthogonal design was; performed,with the content of multi - target ingredient,such as; ligustilide,cinnamic aldehyde, methyleugenol and the yield of inclusion; as comprehensive evaluation indexes. Three factor was performed,the; ratio of volatile oil (mL) to beta - CD (g),the inclusion temperature; and the inclusion time. Results The optimum conditions for inclusion; process were as follow:the ratio of volatile oil (mL) to beta - CD (g); was 1:8,the inclusion temperature was 30℃ and the inclusion time was 1h.; With the optimum inclusion condition,the content of ligustilide,cinnamic; aldehyde and methyleugenol and the yield of inclusion were 86.58% ; 0.009%,73.34% 0.001%,68.89% 0.020%,and 67.98% 0.047%,respectively.; Conclusion The optimum inclusion condition was stable and reproducible; with a high inclusion yield.国家自然科学基金; 上海市教委基

    Progesterone generates breast cancer stem cells through PR-independent mechanisms in irradiated human mammary cell lines

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    Chest radiation exposure was shown to increase breast cancer risk. Steroid hormones are known to influence radiosensitivity and breast cancer risk. Tumors may be initiated by a small subpopulation of cancer stem cells (CSCs). In order to evaluate whether the modulation of radiation-induced breast cancer risk by steroid hormones could involve CSCs, we measured the proportion of ALDH+ and CD44+/CD24- CSCs in irradiated breast cancer cell lines after steroid hormone treatment. Progesterone stimulated the expansion of the CSC compartment both in PR+ breast cancer cells and in PR- normal cells. In MCF10A normal epithelial PR- cells, progesterone treatment and irradiation triggered cancer and stemness-associated microRNA regulations (such as the down-regulation of miR-22 and miR-29c expression), which resulted in increased proportions of radiation-resistant CSCs. Thus progesterone might influence radiation-induced breast cancer risk by generating tumor-initiating breast CSCs through nuclear PR-independent mechanisms, such as membrane progesterone receptors.第73回日本癌学会学術総会に参加し、発表する
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