通过多种形式组织专题提升科技期刊质量

[目的]探索医学期刊组织专题的有效途径,为国内医学期刊提供借鉴与参考。[方法]以《放射学实践》杂志为例,介绍其通过与协办单位合作、及时报道重大科研成果、围绕突发公共卫生事件等多种方式进行专题组稿的经验和体会;比较、分析专题论文和非专题论文的质量。[结果]《放射学实践》近3年成功组织了22个专题,极大地扩大了本刊在业内的影响。专题论文的篇均被引频次和篇均下载量均明显高于非专题论文。[结论]医学期刊编辑应该结合自身杂志特点,充分发挥积极性和主动性,勇于探索,敢于创新,不断开拓专题组稿的新方法和新形式,为提高期刊质量不懈努力。     

Electroosmotic flow hysteresis for dissimilar ionic solutions

Electroosmotic flow (EOF) with two or more fluids is commonly encountered in various microfluidics applications. However, no investigation has hitherto been conducted to investigate the hysteretic or flow direction-dependent behavior during the displacement flow of solutions with dissimilar ionic species. In this investigation, electroosmotic displacement flow involving dissimilar ionic solutions was studied experimentally through a current monitoring method and numerically through finite element simulations. The flow hysteresis can be characterized by the turning and displacement times; turning time refers to the abrupt gradient change of current-time curve while displacement time is the time for one solution to completely displace the other solution. Both experimental and simulation results illustrate that the turning and displacement times for a particular solution pair can be directional-dependent, indicating that the flow conditions in the microchannel are not the same in the two different flow directions. The mechanics of EOF hysteresis was elucidated through the theoretical model which includes the ionic mobility of each species, a major governing parameter. Two distinct mechanics have been identified as the causes for the EOF hysteresis involving dissimilar ionic solutions: the widening/sharpening effect of interfacial region between the two solutions and the difference in ion concentration distributions (and thus average zeta potentials) in different flow directions. The outcome of this investigation contributes to the fundamental understanding of flow behavior in microfluidic systems involving solution pair with dissimilar ionic species.     

Hybrid capillary-inserted microfluidic device for sheathless particle focusing and separation in viscoelastic flow

A novel microfluidic device which consists of two stages for particle focusing and separation using a viscoelastic fluid has been developed. A circular capillary tube was used for three-dimensional particle pre-alignment before the separation process, which was inserted in a polydimethylsiloxane microchannel. Particles with diameters of 5 and 10 μm were focused at the centerline in the capillary tube, and the location of particles was initialized at the first bifurcation. Then, 5 and 10 μm particles were successfully separated in the expansion region based on size-dependent lateral migration, with ∼99% separation efficiency. The proposed device was further applied to separation of MCF-7 cells from leukocytes. Based on the cell size distribution, an approximate size cutoff for separation was determined to be 16 μm. At 200 μl/min, 94% of MCF-7 cells were separated with the purity of ∼97%. According to the trypan blue exclusion assay, high viability (∼90%) could be achieved for the separated MCF-7 cells. The use of a commercially available capillary tube enables the device to be highly versatile in dealing with particles in a wide size range by using capillary tubes with different inner diameters.     

高校环境类公共课程教学模式的改革

随着人类社会的发展,在高等教育中加强环境教育成为高等教育发展的趋势。传统的教育思想已不能适应社会发展的需要,必须要有新的适应社会发展需要的教学理念出现。本文结合自己环境教育教学实践经验并借鉴他人的经验,采用案例——实践教学和研究——合作学习的理念与方式,进行了教学改革试验,收到了初步成效。     

政治语篇中模糊限制语的语用功能分析

模糊限制语在交际过程中具有不可或缺的地位。拟就模糊限制语的定义、分类以及在政治语篇中的语用功能做出分析,得出结论：政治语篇中,模糊限制语具有保全面子,增强说服力,赢取认同与支持,避免承担责任,进行自我保护等人际功能。     

Behavioral Intention to Adopt Digital Library by the Undergraduates

The purpose of this research is to investigate the factors that affect undergraduates' behavioral intention to use digital library among the private universities in Malaysia. The target respondents are undergraduates from Malaysian private universities. Questionnaires were distributed among 500 undergraduates through either online or face-to-face method. Reliability test, normality test, Pearson Correlation Coefficient analysis, and Multiple Linear Regression (MLR) were carried out for data analysis. Performance expectancy, social influence, facilitating conditions, hedonic motivation, habit, and information quality had a positive and significant association with behavioral intention to adopt a digital library except for effort expectancy. This research successfully reinforced that the inspiration to ameliorate Unified Theory of Acceptance and Use of Technology 2 (UTAUT 2) by synthesis of Information Systems Success Model (ISSM). This proposed framework with a combination of ISSM and UTAUT 2 has enhanced the fitness of UTAUT 2. Universities that have yet to implement digital library can comprehend undergraduates' needs better by considering all the significant factors to develop a digital library. The universities with the digital library may also notice the important features of the existing digital library that should be maintained and upgraded constantly so that they can fulfil undergraduates' requirements.     

郑州市普通高校羽毛球运动开展现状及对策分析

论文结合当前郑州市高校的实际情况,采用调查、数理统计、逻辑分析等科研方法对郑州市部分高校羽毛球开展现状进行了调研,对高校羽毛球课程开设进行探讨。     

Assessing the Efficacy of Contextualized Group Counseling Education in Asia: A Mixed Methods Study

International Journal for the Advancement of Counselling - Many experiential learning teaching models are developed in Western cultures, with their efficacy not tested in non-Western cultures,...