教学资源计划的提出与尝试

教学资源计划是构造成熟、高效和特色丰富的大型在线教学系统的保证，可用作为开发各类教学系统的基础平台。教学资源计划为教学资源库的扩展和收缩，以及分布式数据的管理提供了极大的便利，有助于教学媒体的二级开发利用，是改革教学内容与教学手段的理想资源库，具有先进性和发展前景。     

中国成人教育之“根”：社区成人教育？——与南海先生“社区说”商榷

针对南海先生提出的“中国成人教育之‘根’：社区成人教育”，本文提出质疑。笔者认为原文在概念厘定、宏观把握、未来预测等方面都存在不同程度的遗憾，特与作者商榷，以推动学术进步。     

自然速度裸足跑足底压力特征与慢跑鞋设计研究

摘要：目的：以探索自然速度裸足跑单步足支撑时间与负荷结构的部位分布规律为基础,并依据功能设计2要素（位置选择与频率设置）的特征研究慢跑鞋能量回输功能设计的策略与方法。方法：研究主要利用RSscan系统对91名大学生自然速度裸足跑进行了足底压力测试。首先采用独立样本T检验、单因素方差分析与卡方构成比检验等方法分析自然速度裸足跑足支撑的时间与负荷特征, 然后利用聚类分析与判别分析对慢跑鞋设计进行了量化研究。结果：自然速度裸足跑单步支撑时间先短后长、负荷空间分布不均集中作用于后足与前足,但时间与负荷分布均无性别差异;大众慢跑鞋后跟与前掌回弹频率的类别设计具有小中大频3类确定标准,个体慢跑鞋类别选择具有确定方法。结论：1）自然速度裸足跑个体单步足支撑先快后慢、节奏鲜明,负荷集中作用于后跟与前掌,但节奏与负荷均无性别差异。2）获得了小中大频3类大众慢跑鞋频率设计标准,并给出了个体慢跑鞋类别选择标准与方法。3）提出了有利于能量回输的个性化专业慢跑鞋设计思路与策略。     

Centrifugal multiplexing fixed-volume dispenser on a plastic lab-on-a-disk for parallel biochemical single-end-point assays

In this study, a multiple sample dispenser for precisely metered fixed volumes was successfully designed, fabricated, and fully characterized on a plastic centrifugal lab-on-a-disk (LOD) for parallel biochemical single-end-point assays. The dispenser, namely, a centrifugal multiplexing fixed-volume dispenser (C-MUFID) was designed with microfluidic structures based on the theoretical modeling about a centrifugal circumferential filling flow. The designed LODs were fabricated with a polystyrene substrate through micromachining and they were thermally bonded with a flat substrate. Furthermore, six parallel metering and dispensing assays were conducted at the same fixed-volume (1.27 μl) with a relative variation of ±0.02 μl. Moreover, the samples were metered and dispensed at different sub-volumes. To visualize the metering and dispensing performances, the C-MUFID was integrated with a serpentine micromixer during parallel centrifugal mixing tests. Parallel biochemical single-end-point assays were successfully conducted on the developed LOD using a standard serum with albumin, glucose, and total protein reagents. The developed LOD could be widely applied to various biochemical single-end-point assays which require different volume ratios of the sample and reagent by controlling the design of the C-MUFID. The proposed LOD is feasible for point-of-care diagnostics because of its mass-producible structures, reliable metering/dispensing performance, and parallel biochemical single-end-point assays, which can identify numerous biochemical.     

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.     

土木工程专业模块化教学探讨

为适应我国工业化发展进程,培养和造就一大批创新能力强、适应我国经济社会发展需要的土木工程技术人才,探讨了通过若干个相关模块的有机搭配,将传统的按学科知识体系构建专业课程体系,转变为按专业能力体系构建专业模块化体系,将传统的以学科为背景的课程教学改变为以培养专业能力为出发点的模块化教学。通过合理安排各模块的教学活动,完成人才培养的全过程。     

追寻与归依——论洛夫的诗歌创作

作为现代新诗史上举足轻重的诗人,洛夫以其独特而复杂的生命体验,融合了中西诗艺并不断进行着诗体创新实验.自1949年赴台后,诗人便长期处于漂泊状态,这使得诗人产生身份的焦虑,于是便开始了生命与诗意的追寻及精神原乡的归依,最终在历史的追寻、解构与重建过程中找到了灵魂的栖息地.     

An unexpected particle oscillation for electrophoresis in viscoelastic fluids through a microchannel constriction

Electrophoresis plays an important role in many applications, which, however, has so far been extensively studied in Newtonian fluids only. This work presents the first experimental investigation of particle electrophoresis in viscoelastic polyethylene oxide (PEO) solutions through a microchannel constriction under pure DC electric fields. An oscillatory particle motion is observed in the constriction region, which is distinctly different from the particle behavior in a polymer-free Newtonian fluid. This stream-wise particle oscillation continues until a sufficient number of particles form a chain to pass through the constriction completely. It is speculated that such an unexpected particle oscillating phenomenon is a consequence of the competition between electrokinetic force and viscoelastic force induced in the constriction. The electric field magnitude, particle size, and PEO concentration are all found to positively affect this viscoelasticity-related particle oscillation due to their respective influences on the two forces.     

Study for optical manipulation of a surfactant-covered droplet using lattice Boltzmann method

In this study, we simulated deformation and surfactant distribution on the interface of a surfactant-covered droplet using optical tweezers as an external source. Two optical forces attracted a single droplet from the center to both sides. This resulted in an elliptical shape deformation. The droplet deformation was characterized as the change of the magnitudes of surface tension and optical force. In this process, a non-linear relationship among deformation, surface tension, and optical forces was observed. The change in the local surfactant concentration resulting from the application of optical forces was also analyzed and compared with the concentration of surfactants subjected to an extensional flow. Under the optical force influence, the surfactant molecules were concentrated at the droplet equator, which is totally opposite to the surfactants behavior under extensional flow, where the molecules were concentrated at the poles. Lastly, the quasi-equilibrium surfactant distribution was obtained by combining the effects of the optical forces with the extensional flow. All simulations were executed by the lattice Boltzmann method which is a powerful tool for solving micro-scale problems.     

黑龙江省公共体育服务体系建设现状与对策研究

本文采用文献资料法、专家访谈法和统计分析法对黑龙江省公共体育服务体系建设现状进行分析,指出存在的主要问题,提出进一步加大公共体育设施投入力度,加强公共体育设施的管理与维护,加强公共体育监测与指导的同步性等对策,旨在加快建设和努力完善黑龙江省公共体育服务体系,推动全民健身运动,实现公共体育服务均等化.