Non-residential property management pattern innovation-Cang Xia Home Affairs Service Center as an example

近年来，房地产行业发展速度不断加快，物业管理也逐渐实现了市场化发展，物业管理作为一种现代化社会管理方式，逐渐走进人们的生活。国内许多城市出现无物业小区管理难等问题，以福州市为例，目前至少还有45%的住宅小区没有实施专业化的物业管理。这些小区大多是老旧住宅小区，建成时间长，规划设计落后，配套设施陈旧不全，由此引发许多社会问题。针对这类问题，各地纷纷结合本地实际情况，因地制宜的进行了一些有益的探索和尝试。但是由于无物业小区的特殊性和复杂性，大部分的治理措施缺乏长效性和可操作性，成为城市社会管理中的“老大难”问题。 本文尝试通过分析我国无物业小区产生的原因，借鉴国内外无物业小区管理的经验，结合福州...Along with the rapid development of real estate industry and mercerization of property management services, property management as a way to modernize social management, and gradually into people's lives. Domestic non-residential property management problems occur in many cities, Fuzhou, for example, currently, at least 45% do not have the professional property management in residential district. M...学位：公共管理硕士院系专业：公共事务学院_公共管理硕士学号：X200913620

A NEW EXPLOITATION METHOD FOR GAS HYDRATE IN SHALLOW STRATUM: MECHANICAL-THERMAL METHOD

天然气水合物是国家的战略能源之一.天然气水合物分解相变使其开采难度高于常规化石能源.国际天然气水合物试验性开采表明通过降压、注热等方法难以满足商业化开采的需求,尤其在水合物位于浅层、软土情况下,持续稳定且高效率的热量供给是其瓶颈.天然气水合物机械-热联合开采是一种新概念模式,即通过粉碎水合物沉积物通过管道输运并在内部分解,这样既增加了传热的表面积,又利用海水热量和对流传热提高了能量供给效率.分析表明:利用该方法开采时水温过高会导致水合物分解过快而产生不稳定流,温度过低又导致水合物二次生成或结冰;水流流速既要能使被粉碎的水合物沉积物颗粒悬浮和流动,又不能导致流动失稳.为了实现高效安全的机械-热水合物开采,经过初步分析提出原位水合物地层粉碎的颗粒直径设定在0.1~1.0cm 之间,控制水流速度为0.22~0.67m/s,温差保证在5 K以上,混合物中水的体积分数大于0.85

公允价值在我国的应用情况研究——来自A股资本市场四个行业的数据

价格模型的回归结果表明公允价值应用后提高了净资产的价值相关性,降低了净收益的价值相关性;与历史成本相比,公允价值的调整额对净资产和净收益不具有增量价值相关性;应用公允价值后,四个行业的价值相关性表现出一定差异;2007年的数据表现异常,其中新旧准则过渡期按公允价值进行调整导致的超常净收益是不可忽视的一个重要因素,从而也说明以2007年数据为主进行的价值相关性研究的结果可靠性不足。国家自然科学基金资助项目(70972113)阶段性研究成果; 国家社科基金重点项目(13AJY005)阶段性研究成

市场环境、公允价值输入值层次及估值技术

适宜的市场环境是公允价值计量准则得以实施的前提,也是公允价值估值方法选择的依据。我国2014年发布的公允价值计量准则虽对公允价值的输入值层次和估值技术给出了具体描述,但对于活跃市场、主要市场等不同的市场概念,以及这些市场与输入值层次和估值技术的关系并没有给出进一步的阐释和说明,实务中极易被混淆和误述。文章以准则为依据,采用理论分析和推理的研究方法,在对公允价值计量赖以存在的市场进行辨析的基础上,通过阐释市场环境对公允价值输入值及所使用估值技术的影响,以图表的方式勾勒了市场环境、公允价值输入值和估值技术三者之间的逻辑关系,演示了公允价值估值的思路和步骤,并提出了准则进一步完善的建议。教育部人文社会科学重点研究基地重大项目(14JJD790008、16JJD790035);;国家社科基金重点项目(13AJY005

基于AGC闭环控制的谐振式压力传感器驱动仿真及接口电路设计

谐振式压力传感器利用正反馈原理,构成包括机械谐振子在内的机电一体的高品质闭环谐振系统,闭环拓扑结构对保持机械谐振器振荡的稳定性和可靠性起着重要作用。本文针对一种典型结构的静电驱动电容检测谐振式压力传感器,在分析工作原理的基础上,构建了其行为级闭环自激仿真模型,在MATlAb中对自激回路的起振情况进行了仿真;最后设计了基于AgC的闭环控制电路。he theory of positive feedback is used by resonant pressure sensor to form highquality mechanical and electrical integration close-loop resonant system including mechanical harmonic oscillator,closed loop topology structure plays an important role to keep the stability and reliability of the mechanical resonator oscillation.In this paper,a kind of typical structure of the electrostatic drive and capacitance detection resonant pressure sensor is analyzed.The behavior model of the closed-loop simulation of self-excitation is constructed based on analyzing the working principle,excitation circuit of the oscillation starting are simulated using MATLAB.Finally,the closed-loop control circuit based on AGC is designed

Preliminary study on electric resistance of hydrate-bearing sediments

电阻法是探测水合物的一项有效技术手段。通过模拟试验,研究水合物沉积物电阻特性与水合物饱和度等因素的关系,对水合物勘探及储量估算具有重要的意义。通过试验室制样获得粉细砂和黏土骨架的含四氢呋喃(四氢呋喃)水合物土样并对其电阻进行研究。结果发现,当沉积物孔隙中不含液体且骨架的干密度小于一定值时,水合物沉积物的电阻随水合物质量含量的增加而减小,变化范围随干密度的增加而减小;当沉积物孔隙中水合物和液态四氢呋喃共存时,合成试样的四氢呋喃体积分数越大,孔隙中液态四氢呋喃越多,沉积物电阻也就越大,且随水合物饱和度的增加而减小

Advances in study of mechanical properties of gas hydrate-bearing sediments

Gas hydrate (GH) is defined as the crystalline solid, or clathrate hydrate, which are formed by some kinds of low mass molecular gases, such as methane, carbon dioxide, and hydronitrogen, with water at relatively high pressure and low temperature conditions. Gas hydrate-bearing sediments (HBS) are some sand, clay and mixed sediment containing gas hydrates. Advances in the study on the mechanical properties of HBS are summarized mainly in aspects of the laboratory test, in-situ investigation, and theoretical model. Firstly, the main factors are discussed including the structure of GH, formation method and matrix characteristics of HBS; Secondly, progress on the laboratory tests and results are discussed, which mainly includes the tri-axial tests with the natural and synthesized HBS samples, the acoustic tests for measuring the elastic coefficients, the tests for investigating the effects of main factors such as the gas and water contents and soil types on the strength of HBS. Thirdly, for in-situ investigations, including the geophysical surveying, in-situ tests (such as downhole tests) and results are summarized; Fourthly, several theoretical models for estimating the mechanical properties of HBS are introduced; At last, the emphases and the tendency in the future study on the mechanical properties of HBS are discussed

盖层特性对CO_2埋存逃逸速度的影响

CO2地下埋存盖层逃逸是判定其埋存可行性的重要因素之一。通过理论分析分别建立了盖层渗透、盖层裂隙或者油井、盖层扩散三种气体逃逸与盖层特性之间的关系,并进行了盖层特性对三种逸出方式的影响分析,以及三种逃逸快慢之间的对比。结果表明:初期以渗透逃逸为主,但随着埋存年限的增加,气体盖层渗透减弱,扩散逃逸占主要地位

Rate Control Strategy Based on the Distributed Character of DCT Coefficients

根据缓存器的状态和信道速率为待编码帧在图像层上预分配目的视频编码比特数 ,使用DCT系数分布特性来表征图像特性 ,继而为帧内每一具体宏块选定最佳量化因子 ,提出了基于DCT系数分布特性的码率控制策略 .并分析了算法的复杂度 ,提出了改进策略 .模拟实验表明 ,该码率控制策略能有效地减少、避免缓存器出现上、下溢的情况 ,而输出码率趋于稳定 .提高了重建图像的信噪比 ,并且在视频图像质量没有明显失真的前提下 ,改进了计算复杂度 .Rate control strategy based on the distributed character of DCT coefficients is proposed , we allocates the target number of bits firstly on picture layer based on the status of the buffer and the channel rate, and then denotes the characteristics of the picture by the distributed characteristics of the DCT coefficients and select a best quantized parameter for every macroblock in a frame. The complexity of the algorithm is analyzed and an improved method is proposed. The experiment shows that this rate control strategy can effectively reduce and avoid the overflow and underflow of the encoder buffer, and the output bit rates tend to stabilization. The PSNR of the reconstructed picture is raised, and the complexity of the algorithm is improved with no visible distortion in video image.安徽省教委自然科学基金资助项目 (99j10 0 18

入侵植物互花米草上的蚜虫新纪录:一条蚜及其种群分化

本研究报道了一条蚜Hysteroneura setariae在中国华南地区取食入侵植物互花米草,这是该植物上的首个蚜虫纪录。结合DNA条形码和系统发育分析,探究了互花米草上一条蚜种群的来源,并基于中国华南、印度、巴基斯坦、美国等地区样品的序列数据,分析了一条蚜种群遗传分化格局。结果显示:华南地区互花米草上的一条蚜来自周边其他寄主植物上一条蚜种群的扩散;北美本土一条蚜种群与亚洲地区种群具有一定程度的遗传分化。国家重点研发计划项目(2016YFE0203100);;国家自然科学基金项目(31772504);;福建省杰出青年科学基金项目(2015J06005