两个均匀分布区间长度比的区间估计

从均匀分布的密度函数和分布函数出发,根据两个总体的独立性,利用微积分公式给出两个均匀分布区间长度比的估计量及其相关的性质。通过已构造的统计量得出了完善的两均匀分布区间长度比的区间估计。     

Association of Estrogen Receptor-α Gene &; Metallothionein-1 Gene Polymorphisms in Type 2 Diabetic Women of Andhra Pradesh

Type 2 diabetes mellitus (DM) is a multifactorial disease where both genetic and environmental factors contribute to its pathogenesis. Estrogen plays an important role in type 2 DM pathogenesis. A number of polymorphisms have been reported in the estrogen receptor (ESR1), including the XbaI and PvuII restriction enzyme polymorphisms of ESR1,which may be involved in disease pathogenesis. Metallothioneins (MT) act as potent antioxidants against various oxidative damages. Very few studies have indicated the association between Estrogen Receptor-α, MT1 gene polymorphisms with type2 DM. A total of 100 type 2 diabetic women and 100 age, sex matched controls were recruited. Using the PCR based RFLP method, the PvuII and XbaI polymorphisms of ESR1 and in MT1A (rs8052394 and rs11076161) gene polymorphisms were analysed. The genotype distribution and frequency of mutated allele showed no significant differences between diabetic and non-diabetic groups in PvuII (χ2 = 2.443; P = 0.1181) or XbaI (χ2 = 1.789; P = 0.1812) and rs8052394 (χ2 = 1.154; P = 0.2840) or rs11076161 (χ2 = 0.4141; P = 0.5199), polymorphisms. This is the first Indian study to conclude that ESR1 and MT1 gene polymorphisms are not associated with increased susceptibility to type 2 diabetes in Indian women.     

总量均衡区问及其长度问题

总量均衡区间是现代市场经济条件下宏观经济运行中总供给与总需求对比波动所形成的一种特殊现象。总量均衡区间的长度是一个十分重要的问题，由总量均衡区间生发的诸多特殊现象与问题，几乎都与总量均衡区间的长度密切相关。可以说，其长度在很大程度上决定了总量均衡区间对宏观经济运行与调控影响的实际强度；同时，其长度也从一特定的角度反映出现实经济运行中的环境条件、管理水平等方面的基本面貌。深入分析总量均衡区间的长度问题，既对深化相关理性认识有所裨益，同时又为改进与完善实际经济管理提供若干新的思路。     

Comparison of step-by-step kinematics of resisted,assisted and unloaded 20-m sprint runs

This investigation examined step-by-step kinematics of sprint running acceleration. Using a randomised counterbalanced approach, 37 female team handball players (age 17.8 ± 1.6 years, body mass 69.6 ± 9.1 kg, height 1.74 ± 0.06 m) performed resisted, assisted and unloaded 20-m sprints within a single session. 20-m sprint times and step velocity, as well as step length, step frequency, contact and flight times of each step were evaluated for each condition with a laser gun and an infrared mat. Almost all measured parameters were altered for each step under the resisted and assisted sprint conditions (η² ≥ 0.28). The exception was step frequency, which did not differ between assisted and normal sprints. Contact time, flight time and step frequency at almost each step were different between ‘fast’ vs. ‘slow’ sub-groups (η² ≥ 0.22). Nevertheless overall both groups responded similarly to the respective sprint conditions. No significant differences in step length were observed between groups for the respective condition. It is possible that continued exposure to assisted sprinting might allow the female team-sports players studied to adapt their coordination to the ‘over-speed’ condition and increase step frequency. It is notable that step-by-step kinematics in these sprints were easy to obtain using relatively inexpensive equipment with possibilities of direct feedback.     

人体(下肢)肌肉功能模型简介

用文献资料研究的方法，对人体肌肉功能模型的概念进行了界定，对其核心内容进行了简要分析，对其在运动生物力学研究中的应用做了概括介绍。结果表明：肌肉功能模型参数是确定肌肉长度、拉力作用线和肌力臂的关键因素，在人体运动的运动学和动力学的定量分析、在体肌肉工作形式的确定、建立生物力学模型、定量评定肌肉功能等研究中有重要作用。     

The influence of personalization on tag query length in social media search

Social content systems contain enormous collections of unstructured user-generated content, annotated by the collaborative effort of regular Internet users. Tag-clouds have become popular interfaces that allow users to query the database of these systems by clicking relevant terms. However, these single click queries are often not expressive enough to effectively retrieve the desired content. Users have to use multiple clicks or type longer queries to satisfy their information need.     

煤矿井下最优救灾、避灾路线的研究

本文重点对灾害时期井下人员避灾和井上人员救灾的路线进行深入的分析和研究,提出了当量长度的概念,即考虑到巷道断面、坡度、风速及局部通行障碍物等因素,计算出来的可以在最短时间内撤退的最安全路线的长度,建立通行难易度指标体系,给出多条路线以供选择,并从中选出最优路线,给以提示和建议。     

The Importance of Length Normalization for XML Retrieval

XML retrieval is a departure from standard document retrieval in which each individual XML element, ranging from italicized words or phrases to full blown articles, is a retrievable unit. The distribution of XML element lengths is unlike what we usually observe in standard document collections, prompting us to revisit the issue of document length normalization. We perform a comparative analysis of arbitrary elements versus relevant elements, and show the importance of element length as a parameter for XML retrieval. Within the language modeling framework, we investigate a range of techniques that deal with length either directly or indirectly. We observe a length-bias introduced by the amount of smoothing, and show the importance of extreme length bias for XML retrieval. We also show that simply removing shorter elements from the index (by introducing a cut-off value) does not create an appropriate element length normalization. Even after restricting the minimal size of XML elements occurring in the index, the importance of an extreme explicit length bias remains.     

对我国优秀男子标枪运动员投掷步技术的研究

本文以我国优秀男子标枪运动员为研究对象,通过影片解析及数据处理,获取其投掷步技术指标。然后与国外优秀运动员进行类比,找出规律及特点;同时具体阐述国内运动员的投掷步幅、投掷步节奏等动作存在的问题,较全面地对投掷步技术进行了定量分析,为促进该技术的教学和训练,提供了定量依据。     

对国外优秀女子百米运动员的加速跑距离、个人最大速度与运动成绩关系的研究

对国外7名优秀女子优秀百米运动员比赛中加速跑的距离、个人最大速度与运动成绩的关系进行研究,并对国内外优秀女子百米运动员的有关指标进行了比较分析.结果发现:1)运动员的运动成绩与比赛中加速跑距离的大小、个人最大速度都呈高度负相关,加速跑距离长,最大速度快,运动成绩优秀.2)国内优秀女子百米运动员平均成绩低于国外优秀运动员的主要原因在于国内运动员在百米比赛中以较高的步频过早地达到了个人最大速度,使加速跑距离过短,影响了运动成绩.