Structural design of a double-layered porous hydrogel for effective mass transport

Mass transport in porous materials is universal in nature, and its worth attracts great attention in many engineering applications. Plant leaves, which work as natural hydraulic pumps for water uptake, have evolved to have the morphological structure for fast water transport to compensate large water loss by leaf transpiration. In this study, we tried to deduce the advantageous structural features of plant leaves for practical applications. Inspired by the tissue organization of the hydraulic pathways in plant leaves, analogous double-layered porous models were fabricated using agarose hydrogel. Solute transport through the hydrogel models with different thickness ratios of the two layers was experimentally observed. In addition, numerical simulation and theoretical analysis were carried out with varying porosity and thickness ratio to investigate the effect of structural factors on mass transport ability. A simple parametric study was also conducted to examine unveiled relations between structural factors. As a result, the porosity and thickness ratio of the two layers are found to govern the mass transport ability in double-layered porous materials. The hydrogel models with widely dispersed pores at a fixed porosity, i.e., close to a homogeneously porous structure, are mostly turned out to exhibit fast mass transport. The present results would provide a new framework for fundamental design of various porous structures for effective mass transport.     

教育公平:教育政策合法性的价值前提

在政治哲学里,公平常常被拿来作为合法性论证的重要前提和决定性因素。教育公平是关涉教育政策合法性论证的价值前提,它决定了教育政策合法性的表现形式和主要内容,规范和引导着教育政策合法性的确立。同时,教育公平引导下的公民广泛参与是提升教育政策合法性的主要实践路径。     

高职院校学生人文素养培养途径的研究

文章阐述了高职院校人文素养教育的内涵,分析了高职院校人文素养教育的现状及成因,力求探索高职院校人文素养教育实现的策略,提出了高职院校学生人文素养的培养途径。     

基于开放式教育背景下高职英语教师角色的探析

在开放式教学过程中,教师不单单只是学生的人生导师、知识的传授者、社会服务者和研究者,在一定制度和环境支持下还应该是校内外课堂的"导演"和"编剧",高职英语教学需要借鉴西方先进的教学方法和教学理念,在宏观和微观两个方面找准自己的角色,进一步深化英语教学改革,创新教学内容和教学方法,努力适应现代高职教育发展需要。     

Public and private value in citizen participation in E-governance: Evidence from a government-sponsored green commuting platform

Citizen participation in E-governance is, essentially, a social exchange between individuals and their government through which the citizen creates public value as well as acquires private value. The direct effects of participation antecedents on participation outcomes have been fully examined, but few researchers have investigated the internal mechanism of citizen participation at the level of psychological value perception. The roles of perceived public and private value between the participation antecedents and outcomes remain unclear. Private value merits careful research in particular as the E-governance environment is being shaped by increasing privatization and continuous IT innovation. Based on the cognitive integration theory and the civic voluntarism model, this paper proposes a theoretical framework to examine the mediating roles of two values. We built a complete research model encompassing ten hypotheses centered on citizen e-participation in the context of green commuting governance. By analyzing survey data on a green commuting platform, we demonstrate the significant mediating effects of these two values and greater effect of private value acquisition on continuous e-participation intentions than public value creation. Our results have important research implications in regards to the roles of perceived values in participation, especially perceived private value.     

上市公司规模与业绩关系的实证分析——来自安徽省上市公司的数据

本文选取2005到2007年安徽省46家上市公司为研究对象,对安徽省上市公司规模与业绩间的关系进行了实证研究。用总资产来解释企业规模;用主营业务收入、主营业务利润、其他业务利润、利润总额、净利润来解释公司业绩。通过简单线性回归分析、对数回归模型、因子分析发现,利润总额、主营业务收入等与规模有显著的相关性,公司规模反过来对业绩也有显著的影响,说明安徽省上市公司资产规模与公司的业绩存在着相互影响的关系。     

高校教材选用面临问题及对策研究

教材是知识的载体,是课堂教学的重要工具。优质教材的选用是高校实现人才培养根本任务、提高教学质量和培养学生创新能力的基础,科学选用优质教材势在必行。就高校教材选用中存在的问题进行了深入剖析,提出了解决当前问题、不断提高教材选用质量的对策,以期创新教材选用思路,提高高等教育的教学质量。     

释“巴子肉”

"巴子肉"在《金瓶梅词话》中出现过两次。目前学界对"巴子肉"的释义有四种:一是蚆子肉;二是女阴的隐语;三是风干或晒干的肉;四是腊肉。这些释义都不切合文意。从文意理解、词义构成、构词理据、历史文献以及方言词"把子肉"旁证等方面来看,词话中的"巴子肉"应该理解为"肉片"。     

美国教育惩戒机制对中国高职教育的启示

美国教育惩罚对违规行为实行的是“零容忍”制。政府为学校制定了体罚的实体合法性标准和程序合法性标准。教育惩戒遵循的是“有法可依、违纪必究”原则。中国高职教育应借鉴美国教育惩戒机制,明确教育惩戒的合法地位。高职院校在法律规范基础上,建立具体、明确和量化的校规,公开、公正、合法行使教育惩戒权。     

Synchronization of discrete-time complex dynamical networks with interval time-varying delays via non-fragile controller with randomly occurring perturbation

This paper addresses synchronization problem for discrete-time complex dynamical networks with interval time-varying delays. In order to achieve the synchronization, a feedback controller subjected to randomly occurring perturbations will be considered. The randomly occurring perturbations are assumed to belong to the Binomial sequence. By constructing a suitable Lyapunov–Krasovskii functional, and utilizing reciprocally convex approach and Finsler?s lemma, the synchronization criteria for the networks are established in terms of linear matrix inequalities (LMIs) which can be easily solved by various effective optimization algorithms. The networks are represented by the use of Kronecker product technique. The effectiveness of the proposed methods will be verified via numerical examples.