提升大学生榜样教育实效性的方式方法探析

近年来,大学生榜样教育的实效性有所下降。在归因分析的基础上,认为改进榜样教育的方式方法是提升大学生榜样教育实效性的有效途径。在分析榜样教育实施中若干要素的基础上,指出应当通过提高榜样教育实施者的整体素质,正确选取合理的榜样,榜样宣传方法应当符合当代大学生的心理特点,榜样教育考评应当以大学生行为改变为基本标准等措施,改进榜样教育方式方法,提升大学生榜样教育的实效性。     

网络视频交互心理咨询平台设计

由于当今社会心理问题日益增多而心理咨询师紧缺,网络心理咨询已经成为心理咨询工作的一种有效工具。分析了网络心理咨询存在的问题,指出了网络视频交互心理咨询因其可传递更丰富的肢体语言是能最大限度地仿真面对面心理咨询的一种方式,最后讨论了网络视频交互心理咨询平台的设计和实现方法及使用效果。     

某低渗透油藏注空气开发可行性分析

在调研注空气技术原理及其油藏适宜度的基础上,针对国内某低渗透砂岩油藏X区块地质特点,对区块进行注空气适应性评价,初步明确油藏开发方式为注空气开发。然后,开展室内油水和油气相渗透实验,应用油水及油气渗流理论和油藏工程及气藏工程方法,在分析采油指数与吸气指数、油层破裂压力和注气能力的基础上,确定了低渗透油藏M区块的合理注气压力和注气量。最后采用数值模拟技术对5种开发方案进行预测对比,得出注气比注水开发效果好,进一步对M区块注空气开发进行验证,并筛选出最优开发方案。笔者从注空气技术对油藏的筛选标准、注气能力分析、数值模拟验证等一系列方法对X油藏M区块进行注空气适应性分析,为类似油藏注空气开发提供了有效的方法。     

一种基于二次型的无线传感器网络密钥管理方案

针对现有的基于多项式的密钥预分配管理方案受限于节点间密钥共享率和网络连通率等问题,文中提出了一种基于二次型的无线传感器密钥管理方案.该方案突破现有二元t次对称多项式建立共享密钥的思路,引入多元非对称二次型多项式,利用二次型特征值与特征向量之间的关系,分析证明二次型正交对角化的特性,生成密钥信息,节点则通过交换密钥信息实现身份认证,生成与邻居节点之间独立唯一的会话密钥.性能分析表明,与现有的密钥管理方案相比,方案在抗俘获性、连通性、可扩展性、通信开销和存储开销上有较大的改进.     

公共交通与社区规划设计——以深圳为例

大力发展公共交通的观点已被业界普遍接受,但对公共交通导向的土地利用的实践研究大多未深入到微观规划设计层面.深圳市的居住、商务、综合三种不同类型社区与典型TOD社区之间存在着差距.公共交通与社区规划设计的进一步协调是发展公共交通的重要基础.     

杏树岗地区正向反转构造与裂缝研究

杏树岗地区主要经历了拉张沉降期和反转构造期。拉张沉降期杏树岗地区主要形成NNW向的高角度正断层,同时泉头组地层形成了一组NW向的拉张破裂裂缝;反转构造期杏树岗地区主要形成呈NNE-NNW向展布的正断式反转构造,同时泉头组地层形成了一组近NE向的纵张缝、一组NW向的拉张破裂缝和近NS、NNW向的两组共轭剪裂缝。沉降期间泉头组地层的沉积物基本处于塑性状态,构造裂缝不发育,且此期间形成的构造裂缝经历了较长时间的成岩作用,多被方解石充填,有效性低。反转构造期间泉头组地层已经成岩,在挤压作用下形成了一系列构造裂缝,该时期形成的裂缝以高角度裂缝和直裂缝为主,充填程度较低。反转构造期是杏树岗地区构造裂缝形成的主要时期。     

Dependence of shape on particle size for a crushed rock railway ballast

Laboratory testing of railway ballast poses practical difficulties because the particle size is often too large for most standard apparatus. There are therefore advantages in developing a scaled material whose behavior is representative of the full size material. A first stage in validating such an approach is to investigate whether the particle shape is affected by the change in scale. This paper sets out methods for evaluating form and roundness (aspects of shape) and proposes a new measure for evaluating roundness, termed ellipseness. These methods are then applied to a crushed rock railway ballast over a range of particle sizes. Statistical analysis demonstrates a measurable variation in the distributions of form and roundness with particle size over a range of sieve intervals, although the differences are slight and do not necessarily rule out the use of a scaled material for investigating the factors influencing macro mechanical behavior.     

Decolorization,mineralization, and toxicity reduction of acid orange 6 by iron‐sacrificed plates in the electrocoagulation process

In this study, electrocoagulation (EC) was used to investigate the decolorization and mineralization of an azo dye solution, as well as biodegradation enhancement and toxicity reduction. Initial pH, flow rate, and acid orange 6 concentration were investigated, and the optimum operational parameters were found to be pH = 4, flow rate (Q) = 0.3 to 0.5 L min^?1, and current density = 68.3 A dm^?2. With these optimal parameters, total organic carbon and color removal efficiencies of 40% and 98% were achieved, respectively. Biodegradation was evaluated using the ratio of the 5‐day biological oxygen demand (BOD₅) and the chemical oxygen demand (COD), which was 0.19 to 0.25 initially and increased to the range 0.25 to 0.4 after EC treatment, indicating that biodegradability was significantly enhanced. The mean effective concentration (EC₅₀) was measured to represent the toxicity of the solution. Initial EC₅₀ values ranged from 25 to 6.6%, which represent extremely toxic to very toxic solutions. After EC treatment, the toxicity levels were reduced significantly, suggesting that the EC process could be a promising method for reducing the toxicity of textile wastewater. Copyright © 2007 Society of Chemical Industry     

下向流内循环生物流化床的水力动力学特性研究

研究了下向流生物流化床的流态特征．结果表明下向流流化床降流区的流态接近于推流式,而升流区的流态接近于完全混合式,反应器可以模拟为一个推流式反应器和一个完全混合式反应器的串联．