卧式吸尘器包装结构有限元研究

为了验证卧式尘袋吸尘器包装结构的安全性能,根据该吸尘器生产、物流过程中所处物流环境,采用Creo软件建模,通过施加相应约束条件, 分析卧式吸尘器包装件在物流环境中抗压、随机振动、跌落等情况,采用ANSYS Workbench软件分析包装件在相应载荷作用下的应力、变形以及物理试验下包装 、产品受损情况。结果表明卧式吸尘器包装件在最大堆码情况下,变形量未超过标准规定10 mm;经过模态分析,得到6阶模态参数表明不会发生共振现象;包装 件跌落试验结果表明应力应变较小。该吸尘器包装结构设计满足抗压、随机振动、以及跌落测试等要求,方案可行。     

股指期货主力合约转换与价格发现能力研究

以持仓量最大作为判断股指期货主力合约的标准,分析主力合约转换与价格发现能力变化的内在规律.采用向量自回归模型和向量误差修正模型检验主力合约转换前后新旧主力合约之间的价格引导关系,采用永久短暂模型和信息份额模型测度主力合约转换前后新旧主力合约的价格发现贡献度,从而研究主力合约转换对价格发现能力的影响.研究结果表明,在主力合约转换后,新旧主力合约的价格引导关系的方向发生明显逆转,新主力合约的价格引导能力明显增强;新旧主力合约的价格发现贡献度显著变化,新主力合约的价格发现贡献度显著提高.     

改革开放 40 年来农村集体经济的变迁和未来发展

改革开放 40 年以来,农村集体经济发展的框架体系和发展模式纷繁复杂,城乡关系的变动塑造了集体经济发展的制度环境、资源条件和发展空间。 文章从中国独特的土地制度和集体经济发展重要政策的视角,以城乡关系的四个发展阶段对比,分析集体经济的发展轨迹。 集体经济的发展也经历了四个阶段,并在每一阶段都具有各自的形式与特征。 2012 年至今的新发展阶段,集体经济再发展的制度和政策基础逐步具备,未来发展需要进一步进行制度和组织创新。     

部分省市国有创投企业实地调研与启示

上海国有创投企业与深圳、苏州、广东等创投公司基本上同时起步,但近年来实力差距拉大。碉研认为,上海应通过集团化发展整合现有的国有创投企业,建立上海科技金融集团,并通过机制创新,解决国资管理与市场化经营的冲突问题,使上海国有创投业成为服务上海科技创新战略、新兴产业发展和转变经济发展方式的有力抓手。     

Housing and children: simultaneous decisions?—a cohort study of young adults’ housing and family formation decision

This study contributes to earlier research on homeownership and childbearing by taking into account the potential simultaneity between these two life events. A dataset comprising three different Swedish birth cohorts suggests that these are events that are indeed simultaneous. Different tests indicate that taking this simultaneity into account gives an overall statistically significant improvement of the model fit. However, this result is most obvious for those young adults who faced increasing problems on the housing market. The childbearing decision of these cohorts also seems to be more sensitive to changes in the user cost.     

读《大日经》心得

《:大日经》和《金刚顶经》分属两个系统,一个代表真言乘,一个代表金刚乘,前者倾向于"右道"而后者倾向于"左道"。《大日经》一方面在维护大乘佛教,但另一方面也受到印度教的多方渗透。     

Unconditional government social cash transfer in Africa does not increase fertility

Among policymakers, a common perception surrounding the effects of cash transfer programmes, particularly unconditional programmes targeted to families with children, is that they induce increased fertility. We evaluate the Zambian Child Grant Programme, a government unconditional cash transfer targeted to families with a child under the age of 5 and examine impacts on fertility and household composition. The evaluation was a cluster randomized control trial, with data collected over 4 years from 2010 to 2014. Our results indicate that there are no programme impacts on overall fertility. Our results contribute to a small evidence base demonstrating that there are no unintended incentives related to fertility due to cash transfers.     

Can We Perceive Near Miss? An Empirical Study

Near misses are a special kind of reinforcement which increases one’s desire to play. The aim of this paper is to examine the perception of near misses in normal population. We used a slot machine simulation running on a PC, where participants had to play four rounds with different near miss ratios (0, 15, 30 and 45%). Our sample consisted of 159 individuals with mean age of 22.8 and with no or little gambling experience. For data analysis we used chi-squared goodness-of-fit test and exact binomial test. Despite the fact, that there was a notable effect of near misses results showed that the subjects could not perceive trials of them.     

Impact of physical activity and sedentary behaviour on fall risks in older people: a systematic review and meta-analysis of observational studies

The objective of this work was to summarise and evaluate the evidence showing that physical activity is a protector factor as regards falls in older people. Relevant studies were identified through a systematic search in the MEDLINE and Cochrane Library, under the keywords of accidental fall/numerical data and risk factors, and with the bibliographies of retrieved papers. The combined odds ratio (OR) [95% confidence interval] for physical activity was 0.75 [0.64, 0.88] with moderate heterogeneity (I ²?=?33%). For fall injury, it was 0.59 [0.47, 0.74] and, for falls in general, it rose to 0.94 [0.76, 1.17] with nil heterogeneity. The combined OR for sedentary factors was 1.14 [1.10, 1.82] with moderate heterogeneity (I ²?=?36%). Regular physical activity in daily life yields significant reduction in falls in older people, especially falls with injuries.