大学英语习作评改方式刍议

文章对影响大学英语作文评改结果不理想的种种因素加以分析,指出评改过程中应注意的问题,并提出有益于提高评改效果的几种方式,如学生自评、学生互评、教师与学生面谈评改等,简单介绍了实施过程及注意事项。     

A Statistical Method for Analysis of Technical Data of a Badminton Match Based on 2-D Seriate Images

The use of computer vision technology to collect and analyze statistics during badminton matches or training sessions can be expected to provide valuable information to help coaches to determine which tactics should be used by a player in a given game or to improve the player＇s tactical training. A method based on 2-D seriate images by which statistical data of a badminton match can be obtained is presented. Image capture and analysis were performed synchronously using a multithreading technique. The regions of movement in the images were detected using a temporal difference method, and the trajectories of the movement regions were analyzed using sedate images. The shuttlecock trajectory was extracted from all detected trajectories using various characteristic parameters. The stroke type was determined by comparing the shuttlecock trajectory data with a set of stroke definition data. The algorithm was tested at a training center, and the results were compared with baseline data obtained by expert visual inspection using four video samples, which included approximately 10 000 frames. The shuttlecock trajectory and stroke type were detected correctly in almost 100% of the analyzed video sequences. The average speed of the automated analysis was approximately 40 frames/s, indicating that the method can be used for real-time analysis during a badminton match. The system is convenient for use by a sports coach.     

一种基于扩展FP-TREE的服务推荐方法

针对协作过滤推荐的矩阵稀疏性与扩展膨胀问题,提出一种基于扩展FP-TREE的改进方法.将用户的情境取值抽象为情境空间状态,通过挖掘情境状态与服务的关联进行服务推荐.引入倒排索引扩展FPTREE频繁项头表,建立状态-状态与服务-服务关联;通过索引树表示状态-服务关联,给出扩展FP-TREE与协作过滤矩阵的映射机制,在继承协作过滤的基础上极大地压缩了过滤矩阵.仿真实验表明:与传统的协作过滤推荐算法相比,该推荐方法具有更高的效率.     

儿童过敏性紫癜研究进展

从流行病学、病因和发病机制、临床表现、辅助检查、诊断标准、治疗方法、预后及随访等方面对儿童过敏性紫癜（HSP)的研究进行了综述.已有的研究充分表明，HSP病因及发病机制尚不明确，免疫及遗传的作用机制还需进一步研究.HSP在临床上缺乏特异性的检查手段，主要依靠患儿症状及体征来诊断；当患儿出现罕见或不常见的临床表现时，组织病理学分析就显得尤为重要.目前国内外尚无统一性及特异性的治疗方案，病情轻者多以对症治疗为主，病情严重者多采用激素进行个体化治疗，但相关的治疗方案还需大样本、多中心临床试验研究以及循证医学验证.HSP短期预后较好，长期预后主要与肾脏受累相关，而减少肾脏受累的关键在于早发现，早诊断，早治疗.     

The p38/MAPK pathway regulates microtubule polymerization through phosphorylation of MAP4 and Op18 in hypoxic cells

In both cardiomyocytes and HeLa cells, hypoxia (1% O₂) quickly leads to microtubule disruption, but little is known about how microtubule dynamics change during the early stages of hypoxia. We demonstrate that microtubule associated protein 4 (MAP4) phosphorylation increases while oncoprotein 18/stathmin (Op18) phosphorylation decreases after hypoxia, but their protein levels do not change. p38/MAPK activity increases quickly after hypoxia concomitant with MAP4 phosphorylation, and the activated p38/MAPK signaling leads to MAP4 phosphorylation and to Op18 dephosphorylation, both of which induce microtubule disruption. We confirmed the interaction between phospho-p38 and MAP4 using immunoprecipitation and found that SB203580, a p38/MAPK inhibitor, increases and MKK6(Glu) overexpression decreases hypoxic cell viability. Our results demonstrate that hypoxia induces microtubule depolymerization and decreased cell viability via the activation of the p38/MAPK signaling pathway and changes the phosphorylation levels of its downstream effectors, MAP4 and Op18.     

积极加强建筑工程质量管理刍议

建筑工程的质量关系到人们的财产和生命安全,工程施工者必须要有高度负责的精神.文章从建筑工程质量管理的特点入手,对其存在的问题进行分析,提出了推进建筑工程质量管理的措施.     

河池市土地资源可持续利用的初步探讨

该文在实地调查和广泛收集资料的基础上，分析了广西河池市土地利用现状特点和土地资源潜力，提出了实现土地资源可持续利用的对策。     

管道流体的瞬态仿真模型

通过对管道的离散化处理 ,建立了流体管道频率相关摩擦仿真模型 ;研究了N的取值、离散管段数对仿真结果的影响及管道与集中元件和扰动激励的耦合方法 ,并对带容腔的流体管道系统进行了数字仿真 .结果表明 ,该模型将管道的分布特性表示成网络形式 ,可方便地与各种边界条件进行耦合 ;仿真结果与有关文献提供的近似解析计算和实验结果吻合良好     

环扇形薄板挠度计算的加权残值法

应用加权残值法研究了环扇形薄板的弯曲问题，通过计算实例表明，该方法简单易行，精度高。     

酮醛树脂圆珠笔油墨流变特性的研究

本文研究了自制酮醛树脂圆珠笔油墨的流变特性。发现树脂含量和染料含量对油墨的流变特性有显著影响。在此基础上,提出了一个性能优良的新配方,它的流变特性参数n=0.91,K=6.89N·s~n/m~2,ηa=5.83Pa·s。所得实验结果,可供改进现有国产圆珠笔油墨的质量作参考。