Background subtraction based on logarithm rank function and structured sparsity

Multimedia Tools and Applications - Background subtraction is one of the key technologies for recognizing and detecting moving targets in the field of video surveillance. To cope with the dynamic...     

Motion planning of a quadrotor robot game using a simulation-based projected policy iteration method

Frontiers of Information Technology & Electronic Engineering - Making rational decisions for sequential decision problems in complex environments has been challenging researchers in various...     

Adaptively stepped SPH for fluid animation based on asynchronous time integration

We present a novel adaptive stepping scheme for SPH fluids, in which particles have their own time steps determined from local conditions, e.g. courant condition. These individual time steps are constrained for global convergence and stability. Fluid particles are then updated asynchronously. The approach naturally allocates computing resources to visually complex regions, e.g. regions with intense collisions, thereby reducing the overall computational time. The experiments show that our approach is more efficient than the standard method and the method with globally adaptive time steps, especially in highly dynamic scenes.

     

XNode:一种新的利用RDBMS来存储与检索XML的方法

XML作为互联网上数据表示和交换的标准正在飞速发展,利用RDBMS来存储与检索XML文档是发展的一个趋势。文章提出了一种新的基于路径存储与检索XML文档的方法XNode,采用了前缀加序号的编码策略,并且给出了具体实现方法及实验结果。结果表明该方法的效率高,适用范围广。     

笔记本电脑

如果你曾经看过去年的《微型计算机》增刊，也许还记得《你的第二台电脑之笔记本电脑》。如果说我们去年写的像是一篇恋受攻略，试图让各位比较清晰地了解并找到适合自己的笔记本电脑。[编者按]     

Allene as an alternative functional group for drug design: effect of C--C multiple bonds conjugated with quinazolines on the inhibition of EGFR tyrosine kinase

A series of allenic quinazolines were synthesized as receptor tyrosine kinase inhibitors by using a simple protocol for palladium-catalyzed allene transformation. Among the compounds synthesized, two allenic 4-anilinoquinazolines selectively suppressed epidermal growth factor receptor (EGFR) tyrosine kinase activity in vitro. According to immunoblot analysis, the allenic quinazolines inhibited the EGF-mediated phosphorylation of EGFR and its downstream kinases in A431 cells. Furthermore, one of these allenic quinazolines decreased the proliferation of A431 cells through the induction of cell-cycle arrest and apoptosis.     

Thin films of triglycine sulfate by laser evaporation

Thin films of triglycine sulfate were prepared by laser evaporation. The properties of these films were evaluated by electrical measurements, x-ray diffraction and IR spectrometry. The deposited material was found to be essentially triglycine sulfate with some glycine present as a decomposition product. The deposited material was also found to be highly oriented with the pyroelectric direction lying in the plane of the film.     

Hydrothermal-electrochemical deposition of hydroxyapatite

Age-related differences in the trajectories of saccadic eye movements were examined. Younger and older adult subjects produced saccades to predictable target locations. Detailed features of the movements were examined such as the time of peak acceleration and the variability in the magnitude of the peak velocity. These and other measures reveal important details of the force pulses underlying the eye movements and the mental mechanisms that control them. Although minor differences were apparent between the eye movements of younger and older adults, the general patterns were the same across age groups. These results suggest that fundamental details of the brain mechanisms involved in the control of movement are the same for younger and older adults.     

用串列加速器质谱计测定环境水中^129I的浓度

本文主要介绍大体积水样中＾１２９Ｉ的测定方法及示范应用，１００Ｌ以上的环境水样用强碱性阴离子交换树脂（２０１×７Ｃｌ型）搅拌吸附浓集，活性氯浓度８．０％的ＮａＣｌＯ溶液解吸，ＣＣｌ４萃取，水反萃ＡｇＮＯ３沉淀制成ＡｇＩ源，用串列加速器质谱计（ＡＭＳ）测定＾１２９Ｉ，方法回收率６０％以上，最小可探测限为２×１０＾１０Ｂｑ／Ｌ，比目前通用的中子活化分析法低４～５个数量级，通过首次对全国的有关地区环境不