3DS MAX 5在分子离子结构和反应机理教学中的应用

介绍了运用3DS MAX 5制作分子和离子结构模型及其动画，以及用动画演示化学反应机理的方法。     

Object-based image labeling through learning by example and multi-level segmentation

We propose a method for automatic extraction and labeling of semantically meaningful image objects using “learning by example” and threshold-free multi-level image segmentation. The proposed method scans through images, each of which is pre-segmented into a hierarchical uniformity tree, to seek and label objects that are similar to an example object presented by the user. By representing images with stacks of multi-level segmentation maps, objects can be extracted in the segmentation map level with adequate detail. Experiments have shown that the proposed multi-level image segmentation results in significant reduction in computation complexity for object extraction and labeling (compared to a single fine-level segmentation) by avoiding unnecessary tests of combinations in finer levels. The multi-level segmentation-based approach also achieves better accuracy in detection and labeling of small objects.     

临钢6#高炉含硅量预测的计算机在线实现

临钢6＃高炉铁水中硅质量分数的预测是“高炉专家系统”中的一部分，为了使预测模型能够在线进行，采用了限定记忆法进行模型参数的辨识，对辨识出来的参数用牛顿法进行优化，并且用鼓风机动能和风量，风温2种方法对预测模型的预测值进行了修正，使命中率提高了4－5个百分点，给出了数据库系统的组织以及计算机实现的流程图。该方法使模型的预测命中率与离线预测的水平相当。     

基于MPEG-7标准的视频描述

随着多媒体技术和Web技术的发展，出现了大量的多媒体数据。为了更好地管理和检索多媒体数据，我们需要一种描述多媒体内容的标准。本文根据标准化的描述框架-MPEG- 7，提出了视频对象特征提取与检索系统中的描述原型，主要包括MPEG-7标准的内容描述和视觉描述。最后，讨论了一些与视频描述相关的问题。     

基于WAP的移动电子商务系统的设计与实现

探讨了移动电子商务的WAP网站的网络模型、内容服务器架设和规划技术。并设计了实验系统的测试环境、方法及流程。通过开发一个移动电子商务网站的应用实例说明了其可行性。     

Modification of Boundary Parameters and Fluctuations by IBW and LHCD in the HT-7 Tokamak

Measurements of boundary parameters and their fluctuations have been performed in ohmic (OH) plasma and Ion Bernstein Wave (IBW) and Lower Hybrid Current Drive (LHCD) enhanced confinement plasma using a pneumatically driven Langmuir probe array on HT-7 toka-maX. In the enhanced confinement plasma~ the gradients of electron density and temperature become higher and a transport barrier comes into being in the vicinity of the limiter. The boundary potential shows a clear modification in the same region. The fluctuation levels are significantly depressed and the coherences between fluctuations are reduced evidently in the enhanced plasma.Meanwhile, we obtained the spectral features and the poloidal phase velocity of fluctuations us-ing a two-point correlation technique and found obvious modifications of the turbulence and the poloidal flow. The results suggest that the improved confinement in the IBW and LHCD enhanced plasma is at least partially due to the modification of the boundary parameters and the suppression of the boundary fluctuations and fluctuation induced fluxes.     

无网格伽辽金法及其在电磁场数值计算中的应用

将无网格伽辽金法推广应用于电磁场的数值计算。详细论述了移动最小二乘近似的基本原理和具体实施过程，采用罚因子法处理第一类边界条件。基于修正的弱形式泛函的建立，导出了算法的离散模型。为验证所述的模型和方法，给出了数学验证和计算实例。     

球形Li1+xV3O8的制备及其电化学性能

Li1 xV3O8是一种很好的锂离子蓄电池正极材料。采用高温骤冷法制得V2O5溶胶,与LiOH溶液混合,通过喷雾干燥法制备中间产物,在350℃温度下热处理4h合成锂离子蓄电池正极材料Li1 xV3O8粉末。X射线衍射分析表明合成的Li1 xV3O8粉末结晶度较低。扫描电镜分析表明颗粒呈球形,粒径约为3μm;电化学性能测试结果表明,其首次充电比容量为333.4mAh/g,放电比容量为339.6mAh/g,具有优良的电化学性能。     

锂离子蓄电池正极活性材料磷酸亚铁锂

铁系正极材料是一类新型的锂离子蓄电池用正极材料。铁资源丰富、价廉并且无毒,铁系正极材料有良好的发展潜力。其中,橄榄石相的LiFePO4有可能替代LiCoO2成为新一代正极活性物质。综述了橄榄石相磷酸亚铁锂的电化学性能、结构特征、合成方法、表征方法和容量损失等方面的研究进展,并讨论了该材料的进一步研究方向。     

尖晶石型LiMn2O4电极循环伏安研究

采用循环伏安法(CV)对所制备的尖晶石LiMn2O4(LMO)锂离子蓄电池正极材料进行了研究.用X射线衍射分析表征了LMO的结构,并计算了其晶胞体积;粒度分析表明LMO粉末粒径范围适合用此铂微电极(孔穴深度为43 μm)进行测试;CV结果表明,不管是利用常规粉末微电极还是常规压片电极,分别代表锂离子嵌入和脱嵌两个阶段的两对氧化还原峰,只有在较慢的扫描速率下才能清楚地分开,采用粉末微电极不能提高电极的充放电电流而减少循环时间,但采用粉末微电极,电极半径小,活性物质含量少,可减少活性物质在电解液中浸泡的时间,而且最重要的是使用微电极,使得信躁比Ipa/Ipc增大,提高了测试灵敏度;此外,根据CV曲线及计算所得空腔中LMO的质量(m=1.1×10-4g),可计算得到尖晶石LMO的初始放电容量为131 mAh·g-1.