民营养老院投资风险分析及对策研究

随着中国老龄化程度的加深,民营养老院在社会养老体系越来越受到人们的青睐.文章从民营养老院项目投资的特点出发,重点分析了民营养老院项目在不同的投资阶段所要面临的风险,并针对不同阶段的风险给出了相应的风险控制对策,旨在为民营资本在养老项目上的有效投资决策提供依据.     

An Embedded Co-AdaBoost based construction of software document relation coupled resource spaces for cyber–physical society

Software is a very important means of achieving the vision of the cyber–physical society. Software document relation coupled Resource Spaces prompts the cyber–physical society by facilitating the reuse of software design knowledge. The establishment of software document relation coupled Resource Spaces faces the scarcity of labeled data that helps discovering software document relations between resources dwelling in different Resource Spaces. This paper proposes the Embedded Co-AdaBoost algorithm to overcome this challenge by making the best use of easily available unlabeled data, integrating multi-view learning into the AdaBoost and leveraging the advantages of Co-training for performance enhancement. Compared with conventional AdaBoost, the experiment illustrates the effectiveness of the Embedded Co-AdaBoost in the convergence rate, the accuracy and the steady performance. The empirical experience demonstrates the ability of the Embedded Co-AdaBoost in prompting the development of software document relation coupled Resource Spaces.     

Diet-derived vicilins detected in eggs laid by a double-mated female Callosobruchus maculatus originate from nuptial gifts donated by both male partners

The eggshell and the cement that attaches the eggs of the seed-beetle Callosobruchus maculatus to the seeds of cowpea (Vigna unguiculata) contain vicilins, the main storage protein found in seeds. These proteins are derived from both males and females, which originally sequester them during the larval phase from their seed hosts. In this test, females received vicilin from different males during mating as a seminal nuptial gift, and transmitted this sequestered blend of proteins to the eggs. The presence of vicilin in the cement and eggshell was demonstrated by light microscopy and Western blotting. Quantification using ELISA showed that the concentration of vicilin from seminal vesicles of a virgin male is approximately double that measured following the first copula to a virgin female, suggesting that the investment of vicilin by the males is very important. This is the first demonstration showing that at least two different males can make a direct contribution of a sequestered protein which is used in oogenesis.     

Study on the influence of joint spacing on rock fragmentation under TBM cutter by linear cutting test

Joint spacing is one of the most important geological factors influencing rock fragmentation by TBM cutters and TBM performance. In order to study the influence of joint spacing, full-scale linear cutting tests have been conducted for the Beishan granite samples with different joint spacing (i.e. one intact sample, two jointed samples with joint spacing of 100 mm and 400 mm). For different joint spacing, the influence of penetration depth on rock fragmentation was also explored by varying the penetration depth with an interval of 0.5 mm. During the test process, the three directional forces acting on the TBM cutter were recorded, and the rock chips formed by each cutting pass were weighed, respectively. By analysing the cutting force, crack initiation/propagation and rock chips, the influences of joint spacing on rock fragmentation process by TBM cutter were investigated. The test results showed that the increase of penetration depth cannot improve the TBM breakage efficiency after reaching a certain value for the intact rock sample, and the normal force for intruding the intact rock is larger than that for intruding the rock jointed samples. It is also found that the sample part below the joint plane is intact, thus joint can restrain the crack propagating cross the joint plane and facilitates the chips formation on the cutting surface. For the rock sample with joint spacing of 100 mm, two rock fragmentation modes were found during the cutting process. One mode is that the cracks initiate from the crushed zone under TBM cutter, and the cracks propagate to the joint plane, consequently form large rock chips. The other one is that the cracks initiate from the joint plane and then propagate to the rock cutting surface, and the cracks initiate before the formation of the crushed zone under the cutter. For the rock sample with joint spacing of 400 mm, there are two rock fragmentation stages, i.e., the normal rock fragmentation stage and the joint-controlled rock fragmentation stage. There is a transitional process between these two stages, and also the median crack can be promoted to propagate vertically to joint plane due to the joint existence. This study can provide useful guidance for operation optimization and performance prediction for TBM operating in jointed rock masses.     

Study on rock mass boreability by TBM penetration test under different in situ stress conditions

Rock mass boreability is a comprehensive parameter reflecting the interaction between rock mass and a tunnel boring machine (TBM). Many factors including rock mass conditions, TBM specifications and operation parameters influence rock mass boreability. In situ stress, as one of the important properties of rock mass conditions, has not been studied specifically for rock mass boreability in TBM tunneling. In this study, three sets of TBM penetration tests are conducted with different in situ stress conditions in three TBM tunnels of the Jinping II Hydropower Station. The correlation between TBM operation parameters collected during the tests and the rock mass boreability index is analyzed to reveal the influence of in situ stress on rock mass boreability and TBM excavation process. The muck produced by each test step is collected and analyzed by the muck sieve test. The results show that in situ stress not only influences the rock mass boreability but also the rock fragmentation process under TBM cutters. If the in situ stress is high enough to cause the stress-induced failure at the tunnel face, it facilitates rock fragmentation by TBM cutters and the corresponding rock boreability index decreases. Otherwise, the in situ stress restrains rock fragmentation by TBM cutters and the rock mass boreablity index increases. Through comparison of the boreability index predicted by the Rock Mass Characteristics (RMC) prediction model with the boreability index calculated from the penetration test results, the influence degree of different in situ stresses for rock mass boreability is obtained.     

Reflections on Bayesian Network models for road tunnel safety design: A case study from Norway

Directive 2004/54/EC from the European Parliament states that all EU member states should have well defined methodologies for risk analysis. This means that decisions regarding the design of road tunnels must be supported by risk information. TRANSIT, a Bayesian Network (BN) model for conducting quantitative road tunnel risk assessments has been developed to comply with the requirements. The developers of TRANSIT claim that their model represents best practice for risk assessments of road tunnels. This article explores the foundation for this claim. Furthermore, we assess TRANSIT as a tool for decision support regarding the design of new and novel road tunnel designs. The interactions between TRANSIT and the engineering environment and between risk analysts and responsible decision makers are studied by analyzing the engineering process of the 25 km Rogfast subsea road tunnel project in Norway.Our analysis shows that TRANSIT could be a useful tool in combination with other risk assessment activities. We also find that the model has severe limitations, especially when used for novel tunnel design projects such as Rogfast. First, the model applies a definition of risk that in most cases fails to provide an adequate risk picture, and hence fails to communicate risk to important stakeholders. Second, both data and models are rigid and presented to the users as a “black box”. This poses challenges with regard to the ownership of the analysis results and the responsibility for decisions made on the basis of the model, i.e., the relationship between the developer/owner and the analysts. Third, a standardized model will lead to standardized problems and solutions, which means that the results obtained from TRANSIT will be predictable when some experience with the model is gathered. In this way the model will preserve existing design and not promote innovation with regards to traffic safety designs. Fourth, the model emphasizes key performance indicators such as average annual daily traffic (AADT), tunnel length and curvature, while causes found in accident reports such as driving behavior, latent conditions and organizational and managerial factors may be neglected in the design process.     

基于振动的变压器绕组压紧状态评估方法

为实时评估变压器绕组压紧状态,对变压器振动问题进行研究。在绕组振动成分、振动传播路径和油箱表面振动成分的研究基础上,建立了变压器油箱振动信号模型。在瞬态激振实验中发现:相对于油箱正面测点,顶面测点更能体现油箱瞬态激振响应逐渐衰减的特征;靠近C相套管的顶面测点共振频段随压紧力减小而明显向左位移。进行短路实验,结合不同电流不同压紧状态下的大量实验数据,发现靠近C相套管的顶面测点振动信号共振谱峰分布与瞬态激振实验中共振频段分布较为一致,提出利用共振谱峰位移规律进行绕组压紧状态在线评估。该方法简单易行,只需监测油箱顶面振动信号,适应变压器负荷变化的运行环境,与电网没有电气连接,可以实现变压器绕组压紧状态在线评估。     

江苏省公共建筑能耗分布和运行特点分析

收集了江苏省80余栋既有公共建筑相关信息和建筑分项能耗数据。从公共建筑暖通空调冷热源形式、不同种类公共建筑分项能耗方面进行了分析。总结了江苏省办公建筑、大型公共建筑和商场等类型的建筑能耗量分布情况和不同种类建筑分项能耗的分布和运行特点。     

尚湖镇污水处理厂升级改造扩建工程

为满足日益增长的污水总量处理需求和严格的排放标准,尚湖镇污水厂在充分利用原处理设施的基础上,实施了升级改造建扩工程.针对进水多为染纺废水的水质特点,将原有曝气池工艺改为水解酸化/C-Orbel氧化沟工艺,并增加混凝沉淀处理设施.介绍了改造思路、工艺流程及构筑物设计参数.实际运行效果表明,出水水质能够稳定达到爯城镇污水处理厂污染物排放标准爲(GB 18918—2002)的一级A标准.     

江苏省地域性民用建筑装饰工程室内环境污染特征与控制

文章在对江苏省地域性室内环境污染大量监测数据统计分析基础上,全面分析了江苏省室内环境污染的新特征,提出了民用建筑室内装饰工程室内环境污染控制新措施,提请全社会重视建筑装饰工程室内环境污染,确保民众身体健康.