离子液体-石墨烯修饰碳纤维微电极电化学性能研究

本实验制备了离子液体-石墨烯修饰碳纤维微电极,采用循环伏安法和差分脉冲伏安法测定多巴胺(DA)在该修饰电极上的电化学行为。实验结果显示,修饰后电极的稳定性和重现性明显增加,DA在修饰电极上的氧化过程受扩散控制。在5×10-7-1×10-4mol/L浓度范围内,DA在修饰电极上的氧化峰电流与其浓度呈现良好的线性关系。     

科技期刊编辑要把“学习上的缺点”当缺点

从社会、单位、个人3个层次阐述科技期刊编辑要把“学习上的缺点”当缺点的重要意义,从主观、客观2个角度剖析出现不把“学习上的缺点”当缺点这一问题的原因,从激发崇尚学习的内动力、提高重新学习的创新力、增强落实学习制度的执行力3个方面探讨解决该问题的对策,从而提高科技期刊编辑的综合素质.     

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.     

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.     

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。     

Learning in Action: How Competent Professionals Learn

The studies pertaining to expertise development are diverse and broad (Bjork, 1994; Einstein & McDaniel, 2005; Schneider, Healy, & Bourne, 2002), yet empirical research that bridges expertise development into instructional design theories is still in its very formative stages (Ertmer et al., 2008; Fadde, 2009). This article is intended to identify the instructional principles that are effective in accelerating the performance of journeymen, considering the significant impact of the journeyman stage and the need for hastening performance in that stage. With the introduction to the major scholarly works and principles that have led to the elaboration of training methods, strategies, and materials, this review of literature proposes a learning model that has four components: (1) development plan, (2) action, (3) reflection‐on‐action, and (4) remedies.     

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"。     

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.     

《管子》的朴素生态伦理观及其当代意义

文章梳理了先秦时期一部重要典籍《管子》的朴素生态伦理思想：生态自然观、生态价值观和生态道德观；阐述了《管子》生态伦理思想对当代人类的启示和意义：遵循自然规律，人与自然和谐共生；保护生物多样性，维护生态平衡；珍惜自然资源，提倡可持续发展。