372 research outputs found

    Study on China Real Estate Controlling Policy

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    房地产商品有别于一般商品,因为它不仅是一种消费品,还是一种投资品。作为投资品,它具有保值增值与虚幻泡沫的双重属性。当房地产价格严重脱离其基础价值即房地产市场出现泡沫时,在某种外界因素如利率的升降、税收的增减等的冲击下,房地产泡沫随即破灭。如果政府宏观调控不及时或力度不够,不仅会直接造成房地产市场的混乱,而且极有可能导致金融乃至整个经济秩序的混乱。因而对房地产市场进行有效的宏观管理可以避免重蹈某些国家由于房地产发展违背客观规律而出现的“泡沫经济”的覆辙。 近年来我国房地产价格增长很快,不论是上涨幅度还是平均房价都达到历史上的最高水平,我国政府连续出台了一系列调控政策都无法达到调控房价的目标,政...Real estate is different from common goods. It acts as not only a kind of consumer goods, but also an investment product. As an investment product, it has the dual characteristics: preservation & appreciation and delusive bubbles. When the real estate price departs from its foundation value seriously, together with some impact factors such as rate’s and revenue’s going up or down, the bubbles ...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:20044200

    试析尼采对德勒兹后现代思想形成的影响

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    尼采对现代西方哲学、后现代哲学和许多后现代主义理论家产生了深远的影响。尼采对德勒兹的后现代思想具有决定性影响,主要体现在批判精神、后现代认识论、差异理论、欲望理论、游牧思想等方面。正是借助尼采,德勒兹建立了独特的后现代理论,并将其运用到批判资本主义与现代性中来,获得了巨大的成功

    马克思思想与德勒兹后马克思主义理论

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    马克思对德勒兹后马克思主义理论有着重要影响。德勒兹一方面承续了马克思的批判精神、理论、观点、概念与方法,另一方面也解构了马克思的社会矛盾论、阶级学说等理论,并建构了自己的理论。德勒兹的承续、批判与建构为激进理论与政治策略提供了新视角,但其将普救使命赋予资产阶级,这具有保守性;将希望寄托在精神分裂者、块茎、游牧民等后现代主体身上,其理想具有空想性

    企业家创业、生产性公共支出与区域经济增长——基于动态空间面板方法的实证研究

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    论文在Romer(1986)的基础上通过将生产性公共支出引入到知识积累方程中,在一个DGE框架下求解均衡问题,并借助较新发展的动态空间面板方法实证考察了企业家创业和生产性公共支出对于区域经济增长的影响。结论表明:(1)我国经济增长在省域层面存在着较为明显的空间依赖性和正的空间溢出效应;(2)企业家创业对于我国东、中、西部各区域经济增长均具有较为明显的推动作用;(3)交通以及基础设施建设的改善、林业支出的提高有利于发挥我国西部区域企业家创业对于经济增长的推动作用。科研、教育支出显著增强了我国东部地区企业家创业对于经济增长的促进作用

    IL-20及其受体在大鼠自身免疫性心肌炎不同阶段的表达

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    目的探讨IL-20及其受体在大鼠实验性自身免疫性心肌炎(EAM)急慢性期各阶段的表达。方法将提纯精制后的猪心室肌球蛋白加等体积含结核杆菌H37Ra株的完全弗氏佐剂充分混合,于Lewis大鼠双后足皮下注射制作大鼠EAM模型;将15只大鼠按随机数字表法分成3组,每组5只,分别于3、6、12周后处死取心肌组织进行检测。另取5只大鼠注射0.9%氯化钠注射液作为对照组。HE染色评估EAM急慢性期各时点心肌损伤程度;应用实时荧光定量RT-PCR检测IL-20及其受体链(IL-20R1/R2,IL-22R1)在各时点的mRNA表达;应用Western blotting法检测IL-20在各时点的蛋白表达。并以ELISA检测不同时点心肌组织匀浆IL-20蛋白含量[IL-20蛋白/总蛋白(pg/ng)]。结果 IL-20在EAM急性期3周时表达逐渐升高,6周时达峰值,12周时又逐渐减少。IL-20的组织蛋白水平与基因表达相一致。结论 IL-20可能参与大鼠EAM的疾病过程,并且可能在EAM的晚期炎症及慢性心肌纤维化的机制中起重要作用

    海洋细菌作用下海水中铬化学形态的转化

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    于外加Cr(Ⅳ)和Cr(Ⅲ)的天然海水中接种海洋细菌,充氧条件下培养。在细菌对数生长期,大部分Cr(Ⅳ)被还原为Cr(Ⅲ)继而转化为有机铬。在稳定期,有机铬为溶解铬的主要形态,在无菌控制实验中,Cr(Ⅳ)和Cr(Ⅲ)浓度基本不随培养时间变化。说明在没有海洋细菌活动参与下,水中铬形态转化难以进行。实验结果为天然海水中溶解态铬的热力学不平衡状态提供部分可能的解释

    630nm和514.5nm两种波长激光束对人体胃、肺癌细胞株的HpD光敏化光剂量的研究

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    本工作使用630nm和514.5nm两种波长激光束对不同分化程度的人胃、肺癌细胞株进行HpD光敏化光剂量的比较研究。实验数据显示,514.5nm波长光对体外培养单层癌细胞的光敏杀伤力是630nm光的2—3倍。分析结果还表明,分化程度越低的癌细胞受光敏化的效率越高

    基于标准CMOS工艺的一款宽带限幅放大器芯片设计

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    采用SMIC0.35μmCMOS混合信号工艺来设计开发一款适用于SDHSTM-16的光接收机前端限幅放大器芯片。该限幅放大器的设计采用了电容中和技术来实现带宽的扩展,可满足2.5Gbps速率要求,芯片电路拥有信号丢失检测和自动静噪功能。芯片版图的参数提取仿真表明:芯片最小输入动态范围可达2mV,50Ω负载上的双端输出摆幅约为1400mVpp,在3.3V供电下静态功耗仅为66mW,动态功耗为105mW,有实际推广价值

    Directional region growing algorithm and its applications in vessel segmentation

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    针对医学图像中微细管道结构灰度连续性差,采用常规区域生长法进行分割容易丢失末梢的问题,提出一种定向区域生长算法,可以在生长过程中跨越管道结构中的低灰度区域。算法向图像中已生长区域外灰度最高的方向进行生长,每次将一个体素加入已生长区域,将图像转变为一颗以种子点为根结点的树,再从叶子结点进行回溯以确定感兴趣区域。对实现算法的数据结构进行了讨论。算法可以应用于任意维的图像。对2维和3维图像的测试结果表明,相对于常规的区域生长法,算法可以分割出更多的血管分支。算法对3维图像的运行时间为秒钟量级,可以满足临床应用的要求。Accurate extraction of the vasculature in medical images is prerequisite to structural analysis and further applications such as surgical planning.Region growing algorithm is a simple and effective method to extract thick blood vessels which makes use of the spatial continuity of the vascular tree,while the extraction result of small vessels like hepatic artery is unacceptable.In order to solve the problem that the continuity of tenuous vasculature is poor in medical images and vessel segmentation based on traditional region growing may lose distal branches,a directional region growing(DRG) algorithm is proposed which can skip the low gray area in the vasculature during the growing process.The algorithm grows towards the direction of the maximum gray around the grown region,and adds one voxel to the grown region in each iteration.The image is transformed into a tree after the growing process in which the seed point is the root.A trace back procedure beginning from the leaf nodes of the tree can finally determine the region of interest(ROI).The algorithm relaxes the conditions to determine ROI,and small area with low gray in the ROI is permitted.There are two time-consuming steps in the algorithm due to the enormous amount of data in 3D medical images,one is to determine the growing direction in each iteration,the other is to construct the paths from the seed point to leaf nodes during the trace back procedure.Data structure to improve the speed of the algorithm is discussed.The algorithm can be applied to images with any dimension.The algorithm is tested with 2D and 3D images.In both conditions,the segmentation results obtained by DRG contain more distal branches in comparison with traditional region growing algorithm.To some vein phase CT images with poor quality,the proposed algorithm can also generate better results.Four parameters should be appointed in the algorithm and the empirical values are given.The computational time of the algorithm on 3D images is several seconds,which is acceptable in clinical applications.The surface of the extracted vasculature is rough due to the discrete nature of digital images,and further study is needed to smooth the surface before visualization.国家自然科学基金项目(60701022;30770561
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