次氯酸钠化学品的研究及应用

对次氯酸钠的制备、化学品性状、重要无机化学反应以及在水处理等方面的应用进行了综述。     

从过渡礼仪理论考察蒙正苗族成人礼仪

成年礼仪承担了转换个体阶段性身份、地位、权利义务的功能,与其后个体的婚恋活动、社会活动有着紧密联系,是后一阶段人生礼仪的过渡阶段.独具特色的蒙正苗族男性成人礼仪更为典型地体现了过渡礼仪中的"边缘礼仪"特点.     

功利道德和情感道德的劝善——18世纪英国感伤主义小说的文学伦理学批评

在18世纪经济迅猛发展的英国,对物质的过度追求影响到社会伦理道德体系的构建,感伤主义思潮随之出现。感伤主义文学注重人物内心情感的刻画,作家理查生和斯特恩深受当时诸多哲学家、伦理学家道德伦理观念的影响,在其代表作中或树立伦理道德典范,或剖析传递伦理道德观,劝善读者,成就了现代小说的经典之作。     

Simple Preparation of Spherical Activated Carbon with Mesoporous Structure from Phenolic Resol and Associated Catalytic Performance in Isobutane Dehydrogenation

This study provides a detailed report on the synthesis of spherical activated carbon with mesoporous structure using a soluble low molecular weight phenolic resol precursor through an ammonium alginate assisted sol–gel method. The effects of calcinating temperature and the addition of CaCO_3 as a pore-enlarging agent on texture structure and catalytic performance in isobutane dehydrogenation to isobutene were investigated. Characterization of N_2 sorption,mechanical strength tests,and optical photographs confirmed that the obtained carbon materials had high mechanical strength,a good degree of sphericity,and a large surface area. Introducing CaCO_3 as a pore-enlarging agent during the preparation process promoted the formation of a mesoporous structure of carbon spheres and evidently increased the surface area and oxygen content,which can improve isobutane conversion and isobutene selectivity of these carbon spheres. The conversion of isobutane reached up to 28% for this spherical activated carbon,and the selectivity of isobutene reached up to 96%. Isobutane conversion increased with an increase in calcination temperature due to an increase in the oxygen content,whereas the selectivity of isobutene decreased due to the slight decrease in the specific surface area.     

Land degradation,government subsidy,and smallholders’ conservation decision: the case of the loess plateau in China

Land degradation is one of the severe environmental problems in China. In order to combat land degradation, a soil conservation program was introduced since 2000 to reduce soil erosion by converting slope-cultivated land into forestry and pasture. This paper represents the first systematic attempt to investigate the impact of the soil conservation program on land degradation in the loess plateau. The results indicate that the soil conservation program to convert slope fields into forest or pasture is an effective way to combat soil erosion. However, a subsidy that is higher than profit of land use activity of slope fields before their conversion into forest and pasture is needed to encourage farmers to join the conservation program. A policy measure to encourage and assist farmers to develop sedentary livestock by using crops produced from fields as well as fodder and forage grass from the converted slope fields might contribute to combat soil erosion. Increase in off-farm job opportunities may encourage households to reduce cultivation in slope fields. That implies a policy measure to encourage rural urbanization might contribute to combat soil erosion.     

瓣鳃纲贝类摄食器官组织学研究进展

滤食是瓣鳃纲贝类主要的摄食方式,鳃、外套膜、唇瓣等器官不仅具有摄食同时还具有防御功能,本文就瓣鳃纲贝类摄食器官组织学研究的意义、方法以及现状进行了探讨.     

应用边际分析理论建立最优化经济数学模型

本文应用边际分析理论,即用微分法,对目标函数极值(最大值或最小值)来建立经济数学模型,在企业经营管理中达到费用、成本最小,占用资金最小、利润最大、使经济效益最好,并举例说明其理论和具体方法,可供企业参考和应用.     

我国现阶段的电子商务状况研究

90年代初电子商务概念开始在我国传播,1998年3月我国第一笔互联网网上交易成功,到2005年我国电子商务交易额达7400亿元,我国的电子商务已经从概念讨论进入到务实发展阶段。现阶段我国电子商务的法律政策环境不断完善,电子商务的安全认证标准逐步形成,电子商务国家标准体系正在建立和完善,电子支付环境得到了进一步改善,网络银行的发展及相关法律法规的制定营造了良好的网络环境,电子商务的物流体系也在不断完善。     

试述黎锦熙的语文综合性学习思想

实行综合性学习是各国课程改革的发展趋势之一，我国在新的课程改革中也提出了综合性学习的目标，并纳入语文学科领域。事实上，早在二十世纪二十年代，黎锦熙的著作《新著国语教学法》，在学科内容、教材内客、教学方式等方面实际上已存在着综合性学习的内容和特征。     

一类包含Riemann Zeta函数的求和公式

应用广义Dirichlet积分公式得到了一类包含Riemann Zeta函数的求和计算公式．