学校体育中的竞技体育手段存在的作用与弊端

竞技体育手段长期是学校体育教学的主要内容,在实际操作中也有很多可取之处,但是也有很多弊端。本文通过对这些问题的分析,在肯定原有作用的同时,分析了矛盾和弊端产生的原因,以期正确看待学校体育中竞技体育手段的地位和作用,并对未来竞技体育在学校体育中的地位和作用做出了展望。     

运用因子分析评估教学质量

文章通过教师所授学科成绩进行SPSS软件的因子分析,给出各位任课教师在考试前一段时间内的教学质量评估。此方法比单纯用数学期望和方差分析更有说服力,此操作简单。     

Slack-nibbling battery-aware task scheduling

Dynamic voltage scaling (DVS) is an efficient approach to maximize the battery life of portable devices. A novel overall planning strategy (OPS II) balancing slack supply and demand for DVS is proposed. An OPS II-based slack-nibbling overall planning strategy (SNOPS) algorithm is also proposed, which iteratively nibbles slacks for appropriate tasks selected by an overall planning dynamic priority function to perform DVS until the slack is exhausted and an optimum voltage setting is obtained. For a high-load task set, SNOPS manages to recover battery overload while maintaining schedulability. For random variable-load task sets, SNOPS achieves a saving of 29.51% battery capacity on average, the suboptimal gap is 27.84% narrower than that of our previously proposed OPS-based algorithm, and 92.10% narrower than that of the algorithm proposed by Chowdhury et al. Results indicate that OPS II manages to save battery to various extents while maintaining schedulability, and demonstrates good load compatibility and close-to-optimal performance on average. Biography: GAO Xun(1981–), male, Ph.D. candidate, research direction: embedded system, power optimization.     

试论北京历史上的教堂文化

从人类社会发展历史来看 ,每一社会都有与之相适应的文化。宗教文化是人类文化的重要组成部分 ,而且表现在哲学、伦理、建筑、艺术、音乐、绘画等有关的方方面面。中外宗教不仅丰富了中国的文化内容 ,成为中国历史文化的一部分 ,而且已经与中华民族文化交融为一体。从历史上看 ,基督教自唐朝贞观年间传入中国后 ,就揭开了在北京地区建堂传教的历史。基督教文化与北京传统文化经过长期的冲撞、吸纳与融合 ,逐渐形成独具特色的北京教堂文化。北京教堂文化构成了北京地区丰富多采的教堂文化人文景观。     

白灵菇分类学特性诠释

白灵菇这一食有菌产业中的商业名称所涉及的类群并非分类学意义的一个分类群。经考证发现，它们包括1个种和2个变种，即杏鲍菇Pleurotus eryngii(DC,:Fr.)Qu′el，阿魏侧耳P.eryngii var.ferulae Lanzi,白阿魏蘑P.erngii var.nerbrodensis Inzenga;同时，分别整理了上述种和变种的别名或商业名，识别要点，生境，分布和用途，并列出了它们的分类检索表，为生产和学术交流提供了参考依据。     

Maize HapMap2 identifies extant variation from a genome in flux

Whereas breeders have exploited diversity in maize for yield improvements, there has been limited progress in using beneficial alleles in undomesticated varieties. Characterizing standing variation in this complex genome has been challenging, with only a small fraction of it described to date. Using a population genetics scoring model, we identified 55 million SNPs in 103 lines across pre-domestication and domesticated Zea mays varieties, including a representative from the sister genus Tripsacum. We find that structural variations are pervasive in the Z. mays genome and are enriched at loci associated with important traits. By investigating the drivers of genome size variation, we find that the larger Tripsacum genome can be explained by transposable element abundance rather than an allopolyploid origin. In contrast, intraspecies genome size variation seems to be controlled by chromosomal knob content. There is tremendous overlap in key gene content in maize and Tripsacum, suggesting that adaptations from Tripsacum (for example, perennialism and frost and drought tolerance) can likely be integrated into maize.     

用热力学理论对热释电晶体TGS的改性研究

从热力学德文希尔理论出发，指出关系Ｐ／χ＝Ｐｓ／Ｃ可作为提高铁电晶体的热释电材料优值Ｍ（Ｐ／ε）的一条途径，即通过提高其自发极化强度Ｐｓ来提高其材料优值Ｍ（Ｐ／ε），并生长出了用大极性分子尿素改性的ＴＧＳ晶体－ＵＴＧＳ、ＤＵＴＧＳ、ＬＵＴＧＳ和ＤＬＵＴＧＳ．测试结果表明，这些晶体的自发极化强度Ｐｓ和材料优值Ｍ（Ｐ／ε）均比纯ＴＧＳ有显著提高．     

行编辑程序在PDP—11/23计算机上的实现

本文介绍了如何在PDP—11/23计算机上实现行编辑的方法。对程序中用到的主要数据结构及作用做了说明,并借助流程图详细介绍了行编辑程序各功能的实现过程。     

矽肺病人的免疫状态

本文检查了矽肺病人的多种免疫状态,发现患者同围血中T细胞百分率平均值比对照组显著降低,而B细胞百分率呈有意义增高;血清蛋白、r、α_1、α_2球蛋白有随病程进展而增高趋势;血清免疫球蛋白IgG和IgA含量的增高亦与病程相一致,至Ⅱ期矽肺二者含量增高显著,但IgM含量未见明显变化,仅在矽肺合并结核组,IgG、IgA、和IgM含量呈明显增高;患者组类风湿因子(RF)和抗核抗体(ANA)合并阳性率(24.5％)比接尘组(13.3％)为高;血中循环免疫复合物(CIC)阳性检出率较高,但Ⅰ期矽肺组与对照组相比,未呈统计学差别;患者血中总补体(CH_(50))和C_8含量未见明显变化。根据患者的T细胞检出率降低,B细胞增高、体液免疫结果与细胞免疫相一致,均和病程进展而呈现规律性变化,以及自身抗体增高等免疫现象,似与自身免疲性疾病有类同之处。随着杂交瘤技术的广泛应用,联系近年国外关于石棉肺免疫学研究,对T细胞亚群变化进行了讨论,这方面的深入研究,对阐明矽肺发病机理是有意义的。对矽肺免疫的进一步研究,从实验设计上也提出了有益的建议。     

一种改进的自适应模糊滑模大包线飞行控制方法

提出了一种改进的自适应模糊滑模大包线飞行控制方法。该方法以经模拟退火粒子群算法优化的小波神经网络实现非线性模型的逆,能够更加细致地逼近非线性模型,并针对自适应控制的鲁棒性与瞬态性能差的缺点,将滑模控制与自适应控制相结合共同补偿逆误差,提高了自适应控制的鲁棒性与瞬态性。仿真结果表明:所设计的自适应模糊滑模大包线飞行控制器具有优良的控制性能。