季布故事的变更与发展--兼论《捉季布传文》对《史记》中季布故事的拓展

敦煌本《捉季布传文》的故事原型来自《史记》、《汉书》中的季布故事,其情节更加完善,人物更加丰满,不仅一改汉代史传文学简略质朴的叙事风格,而且整体变化尤为明显。文章通过探讨《捉季布传文》对《史记》中季布故事的拓展,探究了唐代俗文学的创作视角。     

A transparent cell-culture microchamber with a variably controlled concentration gradient generator and flow field rectifier

Real-time observation of cell growth provides essential information for studies such as cell migration and chemotaxis. A conventional cell incubation device is usually too clumsy for these applications. Here we report a transparent microfluidic device that has an integrated heater and a concentration gradient generator. A piece of indium tin oxide (ITO) coated glass was ablated by our newly developed visible laser-induced backside wet etching (LIBWE) so that transparent heater strips were prepared on the glass substrate. A polymethylmethacrylate (PMMA) microfluidic chamber with flow field rectifiers and a reagent effusion hole was fabricated by a CO₂ laser and then assembled with the ITO heater so that the chamber temperature can be controlled for cell culturing. A variable chemical gradient was generated inside the chamber by combining the lateral medium flow and the flow from the effusion hole. Successful culturing was performed inside the device. Continuous long-term (>10 days) observation on cell growth was achieved. In this work the flow field, medium replacement, and chemical gradient in the microchamber are elaborated.     

高校教务信息管理系统常见问题及对策分析

高校教务信息管理系统在应用中凸现出可操作性与兼容性、通用性与个性化需求、开放性与安全性、软件更新速度与维护之间的矛盾。因此,我们应从标准化的统一、兼容性的提高、安全性的保障、市场化的服务等方面入手,寻找相关对策,进一步推进教务信息管理系统在信息化管理中的应用和实践。     

Influence of an Environmental Studies Course on Attitudes of Undergraduates at an Engineering University

Studies suggest that at engineering universities, where the percentage of males and engineering majors is high, pro-environmental attitudes are likely to be weak and may not change. The 15-item New Ecological Paradigm (NEP) scale was used to measure differences in student attitudes before and after an environmental studies course. Results revealed students held more pro-environmental attitudes about the validity of the ecological crisis, the existence of resource constraints, and the delicacy of nature's balance after the course. Students did not shift their views regarding the domination of humans over the environment or their belief in human ingenuity to overcome resource limits. Engineering majors showed weaker endorsement of the NEP compared to non-engineering majors, but the increase in their endorsement after the course was statistically significant.     

无线网络下的动态分块校验机制（英文）

由于无线链路易受到外界干扰，导致数据传输的误码率较高，从而使得数据包成功传输概率降低。而误码所造成的丢包会使无线链路上的TCP传输自动降速，从而对正常的TCP数据传输造成较大影响。针对上述问题，本文在802.11协议的MAC层提出了一种新的校验机制，采用动态分块校验的方法对数据包进行验证，并采用新的方法来计算重传次数。实验表明，本校验机制可以有效提高数据包成功传输概率，进而改善了无线链路上的TCP传输性能，同时保证了多个数据流传输的公平性和数据的正确性。     

Microfluidics-based devices: New tools for studying cancer and cancer stem cell migration

Cell movement is highly sensitive to stimuli from the extracellular matrix and media. Receptors on the plasma membrane in cells can activate signal transduction pathways that change the mechanical behavior of a cell by reorganizing motion-related organelles. Cancer cells change their migration mechanisms in response to different environments more robustly than noncancer cells. Therefore, therapeutic approaches to immobilize cancer cells via inhibition of the related signal transduction pathways rely on a better understanding of cell migration mechanisms. In recent years, engineers have been working with biologists to apply microfluidics technology to study cell migration. As opposed to conventional cultures on dishes, microfluidics deals with the manipulation of fluids that are geometrically constrained to a submillimeter scale. Such small scales offer a number of advantages including cost effectiveness, low consumption of reagents, high sensitivity, high spatiotemporal resolution, and laminar flow. Therefore, microfluidics has a potential as a new platform to study cell migration. In this review, we summarized recent progress on the application of microfluidics in cancer and other cell migration researches. These studies have enhanced our understanding of cell migration and cancer invasion as well as their responses to subtle variations in their microenvironment. We hope that this review will serve as an interdisciplinary guidance for both biologists and engineers as they further develop the microfluidic toolbox toward applications in cancer research.