基于用户-服务器环境的中间件技术比较和测试

分布式计算系统旨在借助对分散在网络上的计算资源的整合来解决大量计算问题。对基于不同的性能指标,选择最有效的分布式对象中间件技术是一项重要的研究课题。本文在额外开销和往返延迟等方面对CORBA、ICE、HORB和基于TCP的Dot NET Remoting这几种分布式计算对象中间件技术做了性能评价和实验测试。结果表明,ICE额外开销的产生较低,而相比于其他中间件,HORB往返延迟较小。     

高校水平衡测试存在的问题及对策

水平衡测试是高校节约用水、科学管水的一项基础工作和行之有效的基本方法。通过对我国部分高校水平衡测试工作现状的分析,指出存在的问题,并且提出完善高校水平衡测试工作的对策和建议。     

BECOMING A MEASURING INSTRUMENT

This paper attempts to collapse the oft-reified demarcation between economistic ideologies and personal programs for self-improvement. In doing so, one can see the symbiotic relationship that exists between what are ostensibly distinct and separate social arenas. I argue that the porosity between discourses of self-improvement, religion, and capitalist expansion is achieved largely through techniques of ‘pastoral power’. Foucault conceptualized pastoral power to represent the circulation of productive micro-power among individuals. Pastoral power is especially effective in a neoliberal era marked by the retrenchment of the state apparatus in securing the good and welfare of the citizenry and the emphasis on the individual to secure her own happiness and wellbeing. By examining one specific case, the popular and influential Purpose-Driven Life program, one can see pastoral techniques at work: the valorization of highly individualistic subjects who are desirous of novelty and fulfillment; the tutelage of the good and charitable shepherd who is concerned with the salvation of each individual member of the flock; and the situational context that situates all of them.     

对改革"两课"考试考核方式的思考

改革“两课”教学,提高大学生学习人文社会科学的兴趣,一直是高校“两课”教育的热门话题。笔者认为,造成当前“两课”教学效果不佳的一个重要原因是考试方法单一、机械、呆板,使学生陷入“应试教育”的怪圈。结合多年的教学实践经验,笔者探讨了口试与笔试相结合、知行考试相结合、开卷考试与闭卷考试相结合等灵活多样的考核方法,旨在通过科学的考评方法增强“两课”教学的吸引力。     

评估方案的特色与创新

本文结合对全国第一批26所高职高专院校人才培养水平评估的情况,分析了评估方案和评估手段的特色和创新.在评估结构、评估原则、技能测试、专题研讨、个别访谈、专业剖析12个方面进行了论述.     

耕地经营规模对农户亲环境行为的影响

本文根据农户亲环境行为实施的动态优化模型理论分析了耕地经营规模对农户亲环境行为实施的可能影响,并利用山东省549户农户1417块地块的样本数据,运用Oprobit模型和Probit模型,从家庭层面和地块层面分别实证检验了耕地经营总规模和地块经营规模对农户亲环境行为实施的影响及其差异,以期为制定治理农业面源污染、提升农业可持续发展能力等相关政策提供科学依据。研究结果表明：农户耕地经营总规模和地块经营规模与农户总体亲环境行为实施之间均存在稳健的倒“U”型关系;但上述关系因地块属性不同而呈现差异,自家地的地块经营规模与农户总体亲环境行为实施呈倒“U”型关系;而转入地的地块经营规模与农户总体亲环境行为实施呈“U”型关系。最后,提出政府应积极推进农地流转,促使农户耕地连片规模经营中应注意其适度性,以及加强规范农地流转程序和管理等建议。     

基于路径依赖视角的旅游资源诅咒演化模型

旅游资源诅咒假说常在旅游研究中解释旅游发展与经济长期增长的非线性关系,但这一过程是怎样形成的却并不清楚。本文通过系统梳理旅游资源诅咒假说相关文献,认为资源依赖型旅游发展模式是否阻碍经济增长是判断旅游资源诅咒假说成立的基础,旅游发展的挤出效应是旅游资源诅咒假说的作用原理,而路径依赖则是旅游资源诅咒的生成机制。在此基础上,本文分析了旅游资源价值的动态变化特征、旅游产业演化的复杂特征,结合路径依赖复合模型,建立了结合宏观及微观两个层面的旅游资源诅咒演变模型。模型认为：受旅游资源丰裕度影响,旅游目的地在宏观上会在路径依赖的影响下陷入发展模式锁定状态;但受旅游资源价值边界变化的影响,旅游目的地在微观上会根据市场需要不断发生层级演化及转换发展,试图通过不同发展路径重组突破旅游资源诅咒困境。本文加深了对旅游资源诅咒复杂演化过程的理解,对促进旅游目的地的可持续发展具有参考意义。     

The relationship between inertial measurement unit-derived ‘force signatures’ and ground reaction forces during cricket pace bowling

Abstract

This study assessed the reliability and validity of segment measured accelerations in comparison to front foot contact (FFC) ground reaction force (GRF) during the delivery stride for cricket pace bowlers. Eleven recreational bowlers completed a 30-delivery bowling spell. Trunk- and tibia-mounted inertial measurement units (IMUs) were used to measure accelerations, converted to force, for comparisons to force plate GRF discrete measures. These measures included peak force, impulse and the continuous force–time curve in the vertical and braking (horizontal) planes. Reliability and validity was determined by intra-class correlation coefficients (ICC), coefficient of variation (CV), Bland–Altman plots, paired sample t-tests, Pearson’s correlation and one-dimensional (1D) statistical parametrical mapping (SPM). All ICC (0.90–0.98) and CV (4.23–7.41%) were acceptable, except for tibia-mounted IMU braking peak force (CV = 12.44%) and impulse (CV = 18.17%) and trunk vertical impulse (CV = 17.93%). Bland–Altman plots revealed wide limits of agreement between discrete IMU force signatures and force plate GRF. The 1D SPM outlined numerous significant (p < 0.01) differences between trunk- and tibia-located IMU-derived measures and force plate GRF traces in vertical and braking (horizontal) planes. The trunk- and tibia-mounted IMUs appeared to not represent the GRF experienced during pace bowling FFC when compared to a gold-standard force plate.     

Reference power values for the jump squat exercise in elite athletes: A multicenter study

ABSTRACT

The present study aimed to provide reference values for lower-limb muscle power assessed during the incremental jump squat (JS) test in elite athletes (i.e., professional athletes competing at international level). We pooled data from all JS tests performed by elite athletes of different sports in two high-performance centres between 2015 and 2019, and computed reference values (i.e., terciles) for mean power (MP), mean propulsive power (MPP), and peak power (PP). Reference values were obtained from 684 elite athletes (458 male and 226 female) of 16 different sports (boxing, judo, karate, fencing, taekwondo, wrestling, basketball, soccer, futsal, handball, rugby union, badminton, tennis, long distance running, triathlon, and sprinting). Significant differences (p < 0.001) were found between male and female athletes for MP (7.47 ± 1.93 and 6.15 ± 1.68 W·Kg^?1, respectively), MPP (10.50 ± 2.75 and 8.63 ± 2.43 W·Kg^?1), and PP (23.64 ± 6.12 and 19.35 ± 5.49 W·Kg^?1). However, the velocity at which these power measures was attained seemed to be independent of sex (~0.95, 1.00 and 2.00 m·s^?1 for mean, mean propulsive, and peak velocity, respectively) and homogeneous across different sport disciplines (coefficient of variation <10%). These data can be used to classify athletes’ power capabilities, and the optimum velocity ranges provided here could be useful for training purposes.     

浅谈石油制品进销存综合管理的实现

本介绍一个石油制品进销存综合管理系统的具体实现方案。该系统包括三个子系统：加油监控子系统、液位遥测监视子系统和业务管理子系统。加油监控子系统完成电脑加油机／付油控制仪的监控；液位遥测监视子系统完成储油罐的液住、界面和温度测量，通过容积表换算成液体容积和质量；业务管理子系统通过对存储的加油数据和储油容积、质量数据进行处理，实现加油站／油库的日常管理功能。