计算机分析视听型教学系统

本文论述了计算机分析视听型教学系统的总体结构、硬件技术特点和软件结构。本系统作为一种先进的现代教学工具,对于提高我国的教学质量和改进教学方式都将起到重要作用。文章中对该系统的设计目标、硬件实施的具体技术特点以及软件功能模块的作用也作了详细的描述。     

信息化教学中的弗兰德斯分析法应用与研究

研究了在信息化教学的背景下传统弗兰德斯分析法的缺陷与不足,提出一种改进型弗兰德斯分析法,并基于真实课堂数据做了深入分析与探讨.     

The Einstein Papers Project 1955～2005

The publication of the Collected Papers of Albert Einstein has been a long-standing editorial project. So far, nine volumes of Einstein＇s collected writings and correspondence have been published since 1987 （with one double volume）. They cover Einstein＇s life and work from 1879 to 1921. The tenth volume of correspondence is due to appear in fall 2006.     

计算机分析视听型教学系统

本文论述了计算机分析视听型教学系统的总体结构、硬件技术特点和软件结构.本系统作为一种先进的现代教学工具,对于提高我国的教学质量和改进教学方式都将起到重要作用.文章中对该系统的设计目标、硬件实施的具体技术特点以及软件功能模块的作用也作了详细的描述.     

Locomotor kinematics of the gecko （Tokay gecko） upon challenge with various inclines

Tokay geckos are skillful climbers and are able to negotiate difficult terrain such as steep slopes and overhanging inclines without losing their foothold. Here, we present data on the changes in locomotor kinematics when geckos are challenged to walk on various inclined surfaces. We trained individual geckos to move along a platform which can be tilted to simulate different slopes. The animals were filmed using a high-speed video camera. The results showed that their speed decreased with increasing slope angle, and their speed on the steep and inverted slopes （sloped angle 〉60~） decreased at a faster rate than on the shallow slopes （sloped angle 〈60~）. The geckos＇ stride length was much greater on the shallow slopes compared to the inverted slopes. The influence of stride length and stride frequency on speed was different when the geckos moved across different slopes. There are significant differences duty factor, which varied from 0.54 when wall climbing （90° slope） to 0.84 when walking on the ceiling （180° slope）. The mechanisms revealed this study will improve our understanding of control strategies in kinematics and inspire the design of robots with greater mobility.     

爱因斯坦档案50年

The publication of the Collected Papers of Albert Einstein has been a long-standing editorial project. So far, nine volumes of Einstein's collected writings and correspondence have been published since 1987 (with one double volume). They cover Einstein's life and work from     

Controllable Fabrication of Spider-Web-Like Structured Anaphe Panda Regenerated Silk Nanofibers/Nets via Electrospinning/Netting

An Anaphe panda silk nanofibers / nets( NFN) membrane with attractive structures consisting of common electrospun nanofibers and two-dimensional( 2D) spider-web-like structured nano-nets were successfully fabricated via electrospinning / netting technology. The unique structures of NFN membranes such as extremely small diameter( 20 nm),high porosity,large specific surface area. and biocompatibility make this Anaphe panda silk NFN membrane a promising candidate for biomedical applications. In the present study, field emission scanning electron microscopy( FESEM) was used to investigate the influence of polymer solution and humidity on nano-nets coverage and morphology. The FE-SEM images revealed that nano-net coverage area increased with increase in concentration of solution while lowering the humidity increased the nano-nets formation. Moreover,the mechanical properties of the membrane were also tested and the result showed that the silk NFN membrane displayed a breaking stress of 3. 7 MPa and breaking strain of 13. 8%. For further structural elucidation, Fourier transform infrared spectroscopy( FT-IR) was used to analyze the structural conformation changes from random coil to β-sheet in the NFN membrane which was an important factor effecting the usability of membrane. Thus,the results above confirmed the feasibility of Anaphe panda NFN structures applicability in cell tissue culture and other biomedical applications.     

课堂多媒体学习环境—SHARE系统设计与结构

本文介绍一个课堂多媒体教学系统的设计原理。重点讨论系统的结构，课堂教学资源的共享，以及对教学通信功能的详尽描述。     

Corrosion of magnesium and magnesium –calcium alloy in biologically-simulated environment

A study of biocompatibility and corrosion of both metallic magnesium(Mg) and a magnesium alloy containing 1% calcium(Mg–Ca) were investigated in in vitro culture conditions with and without the presence of bone marrow derived human mesenchymal stem cells(h MSCs).Chemical analysis of the degraded samples was performed using XRD and FEGSEM. The results from the XRD analysis strongly suggested that crystalline phase of magnesium carbonate was present on the surface of both the Mg and Mg–Ca samples. Flame absorption spectrometry was used to analyse the release of magnesium and calcium ions into the cell culture medium. Magnesium concentration was kept consistently at a level ranging from 40 to 80 m M for both Mg and Mg–Ca samples. No cell growth was observed when in direct contact with the metals apart from a few cells observed at the bottom of culture plate containing Mg–Ca alloy. In general, in vitro study of corrosion of Mg–Ca in a biologicallysimulated environment using cell culture medium with the presence of h MSCs demonstrated close resemblances to in vivo corrosion. Although in vitro corrosion of Mg–Ca revealed slow corrosion rate and no immediate cytotoxicity effects to h MSCs, its corrosion rate was still too high to achieve normal stem cell growth when cells and alloys were cultured in vitro in direct contact.     

青海省西宁市城市市政污水中绿藻资源调查

以青海省西宁市市政污水出水为研究对象,初步调查了污水中的绿藻资源,并从形态学上进行初步鉴定。结果显示,污水中含有绿藻门小球藻科蹄形藻、小球藻、顶棘藻,栅藻科栅藻,卵囊藻科纤维藻,衣藻科衣藻等藻株。而且栅藻藻株种类明显多于其他种类藻株。该实验结论希望能为污水净化和利用污水培养能源微藻提供依据。