加强政策事中事后评估的思考

党的十九届四中全会明确提出要强化决策执行、评估、监督,做好政策评估对优化政府职能、推动国家治理体系和能力现代化有积极作用。加强政策运行情况的评估,应从优化评估工作机制、完善和培育评估机构、强化评估结果的应用入手,不断提升评估工作质量,形成适应中国特色社会主义现代化治理体系的事中事后政策评估机制。     

微波提取酵母胞内甘油的分析方法初探

本文探讨了面包酵母胞内甘油分析的预处理方法——微波破碎法。通过单因素实验分析,确定了胞内甘油的提取条件:酵母细胞用微波破碎3次、每次破碎10 s、间隔5 s,然后用10 mL蒸馏水提取30 min得到胞内甘油,此法简便、易提取,适用于天然产物的快速提取。     

绿色环保军用食品的研究与进展

军用野战食品是保证战士饮食的重要食物,对提高战士的身体素质、提升军队的战斗力具有至关重要的作用。各国军队首脑对此都十分重视,将此项内容作为军队建设的重要内容。基于此,本文综述了相关学者对军用食品的研究,以期为相关学者提供借鉴。     

Latent vs. Observed Variables: Analysis of Irrigation Water Efficiency Using SEM and SUR

In this paper we compare conceptualising single factor technical and allocative efficiency as indicators of a single latent variable, or as separate observed variables. In the former case, the impacts on both efficiency types are analysed by means of structural equation modeling (SEM), in the latter by seemingly unrelated regression (SUR). We compare estimation results of the two approaches based on a dataset on single factor irrigation water use efficiency obtained from a survey of 360 farmers in the Guanzhong Plain, China. The main methodological findings are that SEM allows identification of the most important dimension of irrigation water efficiency (technical efficiency) via comparison of their factor scores and reliability. Moreover, it reduces multicollinearity and attenuation bias. It thus is preferable to SUR. The SEM estimates show that perception of water scarcity is the most important positive determinant of both types of efficiency, followed by irrigation infrastructure, income and water price. Furthermore, there is a strong negative reverse effect from efficiency on perception.     

Value of hedge and expected returns

We demonstrate how it is possible to generate value for an investor with a hedge attached to the buy-and-hold strategy of an S&P 500 index fund. We study the S&P 500 index portfolio (not including dividends) and the value-weighted S&P 500 index portfolio (including dividends) of the Center for Research in Securities Prices for 1967:01–2011:12, using the capacity utilization and the unemployment rates in real time to determine if a hedge position should be initiated or closed. A hedge is initiated if the capacity utilization, the unemployment rate or a combination of the two signals a contraction in the real economy. The hedge position is closed if it signals otherwise an expansion. We use utility gains (Campbell and Thompson 2008), the manipulation-proof performance measure (MPPM) statistics (Ingersoll et al. 2007) and the P-Sharpe ratio (Bailey and López de Prado 2012) to evaluate the performance of a particular hedge strategy. The empirical results show that there are infinitely many hedges that can generate positive utility gains, higher MPPM statistics and higher P-Sharpe ratios.     

人力资源管理强度的研究回顾及在中国情境下的理论框架建构

人力资源管理强度能够从整体上反映企业人力资源管理的效果,在组织管理实践中具有重要的指导作用.但以往关于人力资源管理强度的探讨主要集中于西方情境,这极大地限制了其在中国情境下的发展.因此,本文立足于中国情境,在对现有人力资源管理强度进行理论回顾的基础上,构建了中国情境下人力资源管理强度的研究框架,并从维度、测量与实证研究三个方面进行了未来展望.     

中小企业商业模式创新与实现路径的分析——基于系统框架的思考

商业模式创新,是解决当前中小企业面临发展困境的有效途径。文章以中小企业为对象,在构建商业模式创新系统及对三种不同类型中小企业进行商业模式创新类型定位的基础上,重点讨论了适合于挖掘型创新的配套中小企业及适合于调整型创新的市场型、科技型中小企业商业模式创新的路径,同时从新发展的视角,探讨了中小企业互联网+商业模式创新路径,以期为中小企业商业模式创新提供思路。     

洪口水电站坝基工程地质研究

通过对洪口水电站坝基工程地质条件分析,根据流纹岩岩体硬、脆、碎的特点和物理力学特性,进行工程地质研究,充分利用弱风化流纹岩作为大坝基础,对坝基稳定分析计算,提高了建基面,提出合理处理方式,减少工程量和节省工程投资。     

Together alone: a group-based polarization measurement

Quality & Quantity - The growing polarization of our societies and economies has been extensively studied in various disciplines and is subject to public controversy. Yet, measuring...     

像绅士那样品酒

好酒,自然是由优良葡萄品种酿造而成的,其各种成分和结构均衡协调,香气和风味饱满、丰富、怡人、悠长,不仅能反映葡萄品种的典型特征,更反映葡萄产地的风土和工艺.