女性博客：公共领域的性别再塑或重塑

传播学的受众分类为女性博客提供了一个存在的界定,然而,这一明显为女性定制的公共领域空间中,女性的自主性别形象塑造是否具有网络的充分自主与自由？是对传统媒体女性刻板印象的再塑,还是对其的重复与巩固？笔者拟就此进行调研基础上的分析。     

Average cluster sizes and cluster size distributions of superfine nickel particles in light media

Effects of shear rates on average cluster sizes (ACSs) and cluster size distributions (CSDs) in uni- and bi-systems of partly charged superfine nickel particles were investigated by Brownian dynamics, and clustering properties in these systems were compared with those in non-polar systems. The results show that the ACSs in bi-polar systems are larger than those in the non-polar systems. In uni-polar systems the behavior of clustering property differs: at the lower ionic concentration (10%), repulsive force is not strong enough to break clusters, but may greatly weaken them. The clusters are eventually cracked into smaller ones only when concentration of uni-polar charged particles is large enough. In this work, the ionic concentration is 20%. The relationship between ACS and shear rates follows power law in a exponent range of 0.176–0.276. This range is in a good agreement with the range of experimental data, but it is biased towards the lower limit slightly. Foundation item: Projects(50474037, 50874087) supported by the National Natural Science Foundation of China; Project (BK2006078) supported by the Natural Scientific Funds of Jiangsu Province, China     

Shut-cut nitrification characteristics of aerobic granule in a sequencing batch airlift reactor at low temperature

To investigate the shut-cut nitrification characteristics of aerobic granule,an aerobic granular sequencing batch airlift reactor(AG-SBAR) was carried out with mixed carbon sources of sodium acetate and glucose at 10±1 ℃.Results indicated that ammonia oxidizing bacteria was accumulated inside the aerobic granules and the reactor performed stably with shut-cut nitrification for a long term at low temperature.During the stable operation period,the effluent ammonia nitrogen concentration was maintained at 13.6 mg/L without nitrate and nitrite when the COD/N ratio was 20:1.However,the effluent concentration of ammonia nitrogen was below 0.5 mg/L with effluent nitrosation ratio of 96.7% on average when the COD/N ratio was reduced to 15:1 and 10:1.And the effluent phosphorus concentration was less than 0.4 mg/L during the stable period with the sludge retention time of 30 d.The phosphorus removal efficiency was not strongly influenced by the adjustment of COD/N ratio in this experiment.The removal efficiencies for COD,NH4+-N and PO43--P were 91.3%-94.6%,97.9%-99.7% and 97.1%-99.5%,respectively.     

我国南方农村生活污水处理技术的研发现状

针对农村生活污水直接排放已经成为影响我国农村水环境质量主要因素之一的现状,从适合我国农村的以村落或居民点为单位进行生活污水分散式处理的思维入手,介绍了我国现今主要的分散式生活污水处理技术的原理、特点、不足及其应用现状;继而综合比较了这些技术的技术经济指标,提出了适合我国农村的分散式生活污水处理技术的设计原则;最后提出发展有较高水力负荷,并具备小规模设备化特征和多种生物处理单元复合的创新技术是我国农村生活污水处理技术发展的主要方向。     

基于认知负荷理论的多媒体课件设计研究

多媒体课件的信息加工主要包括信息的选择、组织和整合策略,它直接影响学习者对学习内容的选择、组织和整合。目前高校的多媒体课件比较注重体现多媒体技术形象直观、信息量大、效率高等特点,却往往忽视过量信息加工和学习者认知资源有限之间的矛盾。依据认知负荷理论,合理设计多媒体课件中文字、图片、声音、动画和视频等的呈现方式,可以降低认知负荷,最大限度提高学习者的信息加工水平,以达到提高教学效果的目的,同时对指导当前多媒体辅助教学实践也有重大意义。     

一种改进的Harris角点检测算法

为了降低传统Harris角点检测算法的操作复杂度,提高算法稳定性,本文提出了一种改进Harris角点检测方法。由于传统的Harris角点检测算法需要通过调节系数k的选取来达到最佳的检测效果,这使得其检测精度和检测效率受到限制,也增加了用户的操作复杂度。本文通过研究并改进角点响应函数,避免了系数k的选取,同时,与其他相关改进算法相比,进一步避免了极小值ε的选取,从而实现了算法的自适应性。实验结果表明,本文方法具有较强的自适应性和鲁棒性。     

联系实际,激发兴趣--幼儿科学启蒙策略探究

学前教育主要是指通过恰当的方法对儿童大脑不断进行刺激,以此来使儿童大脑各个部位的功能逐渐完善的教育。也就是说,学前教育是儿童成长中的奠基阶段,对于幼儿的未来发展会产生十分重要的影响。从学前教育的实际情况来看,其教育内容十分丰富,而科学启蒙教育就是其中重要的组成部分。因此,本文将结合笔者实际的从教经验,谈一谈应该如何在学前教育中对幼儿进行科学启蒙教育。     

浅谈改善农村水环境

邹城市地处淮河流域,是鲁西南重要工业城市之一,城区居民人口密度较大,加之我市境内大中型厂、矿企业的生产建设,产生大量水质超标的工业和城市生活废污水排向农村,再加上农村内部乡镇企业、畜禽养殖业和生活污水的增加,农业面源污染不断扩大,全市农村水污染严重、水环境不断恶化。主要表现在：①多条清水河变成了排污河,大面积农田被污水灌溉,河水下渗致使地下水污染严重;②乡镇企业而已分散、生产工艺落后,排污种类多、浓度高,往往是一个企业污染了一条小河、一个池塘、一片农村,对农村水环境造成了严重危害;③农村畜禽养殖场和生活排污问题日益突出,大量的粪便及污水就地排放,污染了农村内部及周边水环境和卫生环境,使乡村小河、池塘变成了臭水沟、臭水塘;④化肥和农药在农业上的大量使用,使农村地下水和河流及湖泊造成污染。     

准直接引语研究综述

准直接引语是一种重要的人物话语方式,它作为一种修辞兼句法手段被广泛地运用于文学作品中。准直接引语是典型的双声语的代表,它是一种混合了作者-叙述者与人物的主观意识的话语叙述方式,它很早就引起学者们的研究。通过对中外学者有关准直接引语研究的综述,希冀对后继引语研究者具有一定的启迪与帮助。     

自媒体时代民间微公益现状及发展

自媒体时代下,以具参与性与公开性的微博为平台,民间微公益应运而生。民间微公益迅猛的发展得益于微博独特开放的传播特性,出现参与者众多的盛况,但同时,公益性信息管理的规范,草根大众对公益发起及运作的科学性,又成为民间微公益发展的重要掣肘。本文以免费午餐为个案,对其发展现状进行研究,并提出相关的解决对策。