H2S废气净化及脱硫剂再生方法的研究进展

HzS作为恶臭气体的主要成分之一,其常见的净化技术主要有干法、湿法和生物法.针对目前应用前景较广的湿式催化氧化脱硫技术,重点介绍了铁基脱硫剂的再生方法,指出了今后H2S废气净化处理的研究重点及方向.     

头孢唑肟钠合成工艺研究

为优化头孢唑肟钠合成工艺,考察了碱种类、有机溶剂、醇水体积比、反应温度等条件对头孢唑肟钠反应收率的影响。确立了较优化的合成工艺条件：以异辛酸钠为转钠剂,异丙醇为溶剂,当异丙醇和水体积比为10：1时,头孢唑肟钠收率为91.8％,纯度为99.34％(HPLC),符合《中国药典》2010年版二部标准规定。此方法工艺简单,易于...     

The Economic Impact of Marena’s Investments on Sustainable Agricultural Systems in Honduras

This study examines the economic impact of sustainable agricultural production systems in Central America. In particular, we investigate the impact of investments promoted by the MARENA Programme in Honduras on the total value of agricultural production (TVAP) of its beneficiaries. Propensity Score Matching techniques along with the Difference‐in‐Differences framework are used to mitigate biases stemming from differences in observed as well as unobserved (time‐invariant) characteristics between beneficiaries and a control group. The econometric estimates suggest that MARENA has had a positive and significant effect on the TVAP of beneficiaries. In addition, the analysis shows that, under alternative scenarios, MARENA yielded higher than expected internal rates of return. The results of this study shed light on the response of small‐scale hillside farmers to economic incentives and lend support to the role of natural resource management projects in Central America as a tool to increase household income while also promoting the conservation of natural resources.     

我国M《,2》/GDP过高原因的再考察——基于融资结构和不良资产的分析

改革开放以来,中国的M<,2>/GDP不断攀升,这种现象已成为中国金融之谜.本文试图从融资结构的角度去解释中国偏高的M<,2>/GDP比值,通过考察M<,2>/GDP的备组成部分,认为银行主导型的融资结构是导致中国高M2/GDP比率的主要因素,进而分析该融资结构下带来的巨额商业银行不良资产对M<,2>/GDP变动的影响.     

浅谈关于非编网络的管理及其维护

随着计算机技术在电视领域中的不断应用,非线性编辑已成为电视台节目后期制作的主流方式,非编网作为电视台的核心之一,其可靠运行的重要性不言而喻。而非编网能不能安全高效运行,在相当程度上依赖于我们是不是结合实际、科学合理地对其进行管理维护。下面结合我的工作以河南电视台非编网为例,谈谈非编网的管理维护。     

B2B电子商务中信用问题的博弈分析

B2B是电子商务中很重要的一个模式,但信用是阻碍其发展的最大瓶颈.文章运用博弈论方法探讨B2B电子商务中信用缺失产生的因为,分别在一次性博弈、重复博弈的情况下分析了B2B电子商务的信用问题进行了分析,最后给出了解除B2B电子商务发展信用障碍的方法.     

城市污泥-二氧化钛复合材料制备研究

为使城市生活污泥得以无害化、资源化综合利用,以过50目城市污泥作为载体、钛酸四正丁酯为钛源,采用溶胶-凝胶法制备城市污泥-二氧化钛复合材料,并就其对甲基橙的光降解催化作用进行了研究。实验结果表明,污泥与钛酸四正丁酯质量比为1：5所制备的城市污泥-二氧化钛复合材料经过500℃煅烧1小时后,对甲基橙具有较好的光催化降解作用,可在印染废水中推广使用。     

The relationship between temperature and CO2 emissions: evidence from a short and very long dataset

The debate regarding rising temperatures and CO₂ emissions has attracted the attention of economists employing recent econometric techniques. This article extends the previous literature using a dataset that covers 800?000 years, as well as a shorter dataset, and examines the interaction between temperature and CO₂ emissions. Unit root tests reveal a difference between the two datasets. For the long dataset, all tests support the view that both temperature and CO₂ are stationary around a constant. For the short dataset, temperature exhibits trend-stationary behaviour, while CO₂ contains a unit root. This result is robust to nonlinear trends or trend breaks. Modelling the long dataset reveals that while contemporaneous CO₂ appears positive and significant in the temperature equation, including lags results in a joint effect that is near zero. This result is confirmed using a different lag structure and Vector Autoregressive (VAR) model. A Generalized Method of Moments (GMM) approach to account for endogeneity suggests an insignificant relationship. In sum, the key result from our analysis is that CO₂ has, at best, a weak relationship with temperature, while there is no evidence of trending when using a sufficiently long dataset. Thus, as a secondary result we highlight the danger of using a small sample in this context.     

SKEWNESS AND KURTOSIS PROPERTIES OF INCOME DISTRIBUTION MODELS

This paper explores the ability of some popular income distributions to model observed skewness and kurtosis. We present the generalized beta type 1 (GB1) and type 2 (GB2) distributions' skewness–kurtosis spaces and clarify and expand on previously known results on other distributions' skewness–kurtosis spaces. Data from the Luxembourg Income Study are used to estimate sample moments and explore the ability of the generalized gamma, Dagum, Singh–Maddala, beta of the first kind, beta of the second kind, GB1, and GB2 distributions to accommodate the skewness and kurtosis values. The GB2 has the flexibility to accurately describe the observed skewness and kurtosis.