中国房地产金融风险分析

本文以中国房地产金融分析为题展开讨论。首先,介绍了房地产金融风险的分类,包括信用风险、流动风险、资产负债结构风险、资产质量风险等。然后,结合相关的工作经验,提出预防房地产金融风险的办法和对策。希望可以减少房地产泡沫,促进我国房地产行业的健康、稳定,以及可持续发展

Comparative Study on Improvement of Diabetic Model Rats between SBA-15/GLZ and SBA-16/GLZ

目的:通过建立Sd大鼠2型糖尿病模型的方法,研究不同的介孔材料SAb-15与SAb-16分别载药格列齐特(glz),释放速率的作用,以筛选出最佳的载药系统,为临床制剂提供参考。方法:考察SAb-15/glz、SAb-16/glz的载药、释药性能,建立大鼠糖尿病模型,分别检测灌胃给药前(0H)和给药后各时间点(3 H,6 H,9 H,12 H,24 H,27 H,30 H,48 H)各组大鼠血糖浓度的变化。结果:1载药系统的热重分析,SbA-15/glz、SbA-16/glz在200~700℃均有显著的失重,分别是14.3%和15.4%,且SbA-16/glz失重高于SbA-15/glz;2fTIr分析中,在红外光谱中500 CM-1~2000 CM-1波数范围内两种材料载药均出现了4个吸收强度较大的特征峰,二者波数范围相同,波峰相似,且与glz的分布趋势大致一致,且SbA-16/glz的吸收强度略高于SbA-15/glz;3载药系统的结构性质,与SbA-15比较,SbA-15/glz在比表面积、孔隙容积上均减小(P<0.01),与SbA-16比较,SbA-16/glz比表面积、孔隙容积上均减小,且SbA-16/glz的比表面积、孔隙容积均显著小于SbA-15/glz(P<0.01);4释放速率:SbA-15/glz内格列齐特有一个迅速的释放过程,12 H即达90%以上,24 H后缓释量逐渐趋于平缓,48 H释放量即达到95%以上,最终缓释量约在97%水平;而SbA-16/glz内格列齐特的缓释相对平缓,12 H之内释放了80%左右,显著低于同等时间点SbA-15对格列齐特释放(P<0.05),48 H最终缓释量约在90%的水平;5血糖变化,在0 H测得的血糖结果中,模型组及各给药组的血糖均显著升高,且≥13.8 MMO l/l,说明造模成功;12 H的血糖值最低,随着时间的推移,glz组的血糖变化梯度最大,SbA-15/glz次之,SbA-16/glz血糖值的变化曲线较平坦,说明介孔材料能有效载药、平稳缓释、在动物模型体内平稳持续释药并发挥作用,避免血糖浓度忽高忽低,SbA-16/glz缓释效果显著优于SbA-15/glz。结论:SAb-16介孔材料的载药量高于SAb-15,缓释持续时间长。Objective: This paper was to research on different mesoporous materials SAB-15 and SAB-16 respectively,the drug loaded Zig Leo Te( GLZ) release rate effect by the method of establishing model of SD rats with type 2 diabetes,and to screen out the best drug carrier-system for clinical use.Methods: Diabetic rat model was established,then to investigate the effect of SAB-15 /GLZ,SBA-16 / GLZ and detect the blood glucose,plasma insulin at the point of 0 h,3 h,6 h,9 h,12 h,24 h,27 h,30 h,48 h.Results: 1The weight analysis system loaded with heat showed that,SBA-15 / GLZ and SBA-16 / GLZ in 200 ~ 700 ℃ showed a significant weight loss,respectively 14.3% and 15.4%,and SBA-16 / G LZ weight loss was higher than that of SBA-15 / GLZ; 2The FTIR analysis,in the IR spectra of 500 cm-1~ 2000 cm-1,wave number range material drug carrier appeared 4 absorption intensity of characteristic peak,and the two peak wave number range is similar,and generally consistent with the distribution of GLZ and SBA-16 / GLZ,the absorption intensity is slightly higher than that of SBA-15 / GLZ; 3The structure properties of the drug carrier system,compared with SBA-15,SBA-15 / GLZ specific surface area,pore volume were reduced( P < 0.01); that compared with SBA-16,SBA-16 / GLZ surface area and porevolume decreased,and the SBA-16 / GLZ specific surface area and pore volume were significantly less than SBA-15 / GLZ( P < 0.01); 4Release rate: SBA-15 to GLZ procedure of a quick release and he quantity achieved above90% at the 12 th h,the rate slowed down after 24 h,at the 48 th h the quantity achieced above 95%,eventually slow release quantity was about 97%.The SBA-16 / GLZ sustained-release relatively flat,within 12 h released by about 80%,significantly lower than SBA-15 at the same point in time( P < 0.05),eventually slow release quantity was about 90%.5The changes of blood glucose showed that,measured at 0thh blood glucose results in the model group and the drug group blood sugar were significantly increased,and was higher than 13.8mmo L / L,indicating a successful model; The glucose concentration of each group at 12 thh was the lowest,and blood glucose in GLZ group change gradient was the biggest,SBA-15 / GLZ group change gradient was less than GLZ group,the curve of change with SBA-16 / GLZ group curve was flat as time went by.Which indicated that be effective,sustained release drug carrier,and played a role in the animal model in vivo sustained drug release and smooth,prevent blood glucose concentration fluctuat,SBA-16 sustained release effect was superior to that of SBA-15.Conclusion: The description of the drug loading of SBA-16 mesoporous material is better than SBA-15 which with releasing of long duration.南京军区医药卫生科研基金(编号:08MA115

Retrieving the Most Prevalent Small Fullerene C(56)

通讯作者地址: Xie, SY (通讯作者),Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] of China,20721001 ,21031004 973 Program 2007CB815301 2011CB93590

黄芪幼苗N,P,K营养缺乏症状和生理特性研究

黄芪是我国重要的传统大宗药材,以豆科紫云英属植物膜荚黄芪Astragalus membranaceus(Fisch.)或蒙古黄芪A.membranaceus(Fisch.)Bge.Var.mongolicusBge.Hsiao.的干燥根系入药[1],具有补中益气、降压利尿、排脓消痈、脱毒生肌、滋养肌肤等多种功效,现代临床及药理研究证明,黄芪还有增强肌体免疫功能,促进抗体合成等作用,有关黄芪的药理活性及其有效成分已得到了较为深入的研究[2-4],随着黄芪市场需求量的增加,野生黄芪资源已难以满足需求,人工栽培黄芪受到重视,并且初具规模。田间栽培黄芪的营养特性和施肥管理是人工栽培质量和产量的理论基础。有关氮磷钾化肥用量及其比例对黄芪生长及产量的影响已有一些研究[5,6],但由于黄芪生长中的营养元素比例不平衡现象时常发生,至于某一种营养元素缺乏时黄芪的外观特征表现,目前尚未见报道,出现缺素症状时难以判断,限制对黄芪及时进行营养调控,对人工栽培黄芪的质量与产量产生影响。本研究的目的是研究黄芪生长中的营养缺乏时的外观表现特征和生理特性变化。本试验采用溶液培养的方法,在氮、磷、钾营养元素缺乏条件下,对黄芪的生长发育状况、营..

Determination of Mineral Elements in Different Part of Astragalus Membranaceus(Fisch.) by FAAS

应用混合酸HNO3-HClO4(4∶1)在常压微沸条件下对膜荚黄芪根系及茎叶样品进行消解,采用原子吸收光谱法测定了膜荚黄芪不同器官即根及茎叶中五种人体必需矿质元素K,Fe,Zn,Mn和Cu含量,并对结果进行了统计分析与比较。该方法标准曲线相关系数为0.997 3~0.999 9,加标回收率为92.88%~109.25%,相对标准偏差(RSD,n=5)为0.393 5%~3.175 2%。方法简单,结果可靠。结果显示,膜荚黄芪根及茎叶中5种矿质元素含量顺序均为K&gt;Fe&gt;Zn&gt;Mn&gt;Cu。膜荚黄芪不同器官矿质元素含量不同,根中富含Fe,Zn,Cu元素,根内Fe含量是茎叶的1.54倍。茎叶中也含有丰富的矿质元素,特别是K和Mn元素。茎叶中K含量是根的1.63倍,这与黄芪的药效相符合。试验结果将为研究矿质元素在黄芪植株中的分布以及矿质元素含量与黄芪药效相关性提供理论依据

生物柴油理化性质与组分关系的研究

对地沟油生物柴油（HOB）、植物油油脚生物柴油（VSB）及豆油（SOB）3种不同原料来源的生物柴油的部分理化性质与0#柴油、麻风树油及生物柴油标准进行对比，重点分析了生物柴油中脂肪酸甲酯组分分布与其理化性质之间关系

多孔玻璃珠固定化脂肪酶及其催化合成生物柴油

以多孔玻璃珠为载体，采用共价法对假丝酵母99—125脂肪酶进行了固定，对比了固定化酶与游离酶的最适反应温度、pH值以及热稳定性。并以所制备的固定化酶为催化剂，在微水体系中利用菜籽油合成生物柴油，考察了溶剂量、体系水含量、甲醇等因素对固定化酶催化性能的影响，研究了固定化酶的操作稳定性

中国近千年石笋-树轮集成温度记录

分析北京石笋年层和祁连山树轮标准化指数及二者的合成指数与气候的关系,探索对响应不同季节温度变化的不同代用指标进行集成的方法。根据集成序列与中国大区域器测资料的相关计算,建立了年分辨率的跨区域千年温度序列。讨论了中国近千年气温变化的一些特点,发现近千年来年代际温度变化低谷与几个重要的太阳活动极小期非常吻合,大区域平均气候在SporerMinimum期间响应太阳的突然&ldquo;冷却&rdquo;,气温下降的速率和幅度比MaunderMinimum期间更为显著。国家自然科学项目(9050200990102005);中国科学院知识创新工程重要方向性项目(KZCX2-SW-118);国家重点基础研究发展规划项目(2006CB400503)资