单板滑雪U型场地技巧优秀运动员竞技能力特征的研究

为了提高单板滑雪U型场地技巧运动员的运动成绩,本文运用文献资料法、专家访谈、逻辑分析法研究了与运动成绩最相关的运动员竞技能力。结果表明:技能是竞技能力中的主导因素,优秀运动员技术特征表现为稳、高、飘、难、多样性。运动员体能三要素中以运动素质为主;优秀运动员下肢和腰腹肌肉力量发达,有良好的平衡协调能力,下肢关节和躯干的柔韧性较好;优秀运动员的心理特征表现为兴奋敢为型和自信型;竞技能力中的各因素互相影响,相互促进,只有共同发展,才能提高运动员的运动成绩。     

Health-education policy interface: the implementation of the Eat Well Be Active policies in schools

While grappling with their traditional core business of imbuing students with official curricular knowledge, schools have simultaneously, increasing demands to take on health promotion responsibilities. This paper examines the mandated implementation of the Eat Well Be Active (EWBA) Action Plan and its subsidiary ‘Smart’ policies in schools in the state of Queensland, Australia. Within the context of health promotion, the interaction between the health and education policy interfaces was explored. In particular, we paid close attention to the responses of the schools and their staff to the convergence of various health policies within their institutions. Drawing on Bernstein's concept of field, this paper reports our analyses of responses within the reproduction field to the imperatives of the Smart policies. The results suggest that there exists a disjunction between the recontextualising and reproduction fields in terms of the EWBA policy intent and implementation.     

利用虚拟实验增强数学建模与高等数学教学之间的互补作用

高等数学是高等院校中理工和经管类专业的基础必修课,而数学建模是重要的数学应用手段。将数学建模的思想方法融合到高等数学教学中,不仅可以改变高等数学教学比较枯燥、脱离实际的现状,还可以促进数学建模的普及和应用。但是．在目前高校的教学体系下,受到课时短、教学和实验场所不够充裕等条件的限制,以上两者的融合并不容易。本文提出了采用虚拟实验来增强两者间互补作用的思路,通过信息化、网络化、图形化的手段来扩展两者融合的时间和空间．同时满足学生和教师对学习过程更加简易化、直观化、可操作化、安全化的需求。     

中关村示范区高新技术企业创新效率分析——基于产业角度的DEA分析

中关村高新技术领域的创新效率可以采用数据包络分析方法进行评价。"十一五"期间中关村电子信息、先进制造、新能源、新材料、现代农业、海洋工程、核应用7个领域高新技术企业创新效率相对有效,环境保护、生物医药、航空航天3个领域的高新技术企业创新效率相对非有效。环境保护领域为纯技术效率有效、规模效率无效,生物医药和航空航天领域为纯技术效率和规模效率都相对无效。环境保护领域作为北京市未来重点发展的领域,应重点提升创新能力、改善创新产品领域和结构;生物医药领域应该调整投入产出规模,增加资源投入,提升创新能力;航空航天领域与国家利益息息相关,应在保持创新投入不变的情况下提高创新产出能力。     

Improving the wind and temperature measurements of an airborne meteorological measuring system

The Aircraft Integrated Meteorological Measuring System 20 Hz(AIMMS-20) has been used by the Hong Kong Observatory(HKO),China in data collection for tropical cyclone situations over the South China Sea and windshear and turbulence measurement at the Hong Kong International Airport(HKIA).This paper discusses possible methods for further enhancing the quality of the wind and temperature measurements from the system.For wind measurement,the enhancement methods include:error modelling of the accelerometer(e.g.,bias offset and cross-axis rate sensitivity),global positioning system(GPS) phase lag consideration,better representation of the inertial measurement unit(IMU) velocity based on the GPS velocities and considering their location differences,consideration of the slower update of GPS velocity,and wing flexure.For temperature measurement,the methods include the consideration of the temperature sensor response and the sensor housing response.The results of typical flights using AIMMS-20 show that the accuracy of the wind and temperature data could be improved by 20%-30%.Though the discussion in the present paper is related mainly to a specific meteorological measuring system on a particular aircraft,the techniques so employed should be a useful reference for similar systems installed on other aircraft.     

Effect of terrain and building structures on the airflow in an airport

The aim of this study was to perform computational fluid dynamics (CFD) simulations on the airflows at the Hong Kong International Airport (HKIA). In particular, the effects of hangar buildings and terrain were studied to explore the effects of turbulence on flying aircraft, especially during landing. The CFD simulation showed that significant differences in wind speeds may occur between the north and the south runways on the western part of the HKIA under typhoon conditions with a strong north to northwesterly wind. Simulation also showed that the hanger buildings between the two runways on the western side and the nearby terrain could be causing the observed difference in the wind speeds. The results also indicated that these obstacles could cause significant wind speed variations at the western end of the south runway. This may affect the operation of landing aircraft. The CFD results for a typical typhoon case were analyzed and found to match the wind data recorded by an aircraft landing that day.     

Statistical extremes and peak factors in wind-induced vibration of tall buildings

In the structural design of tall buildings, peak factors have been widely used to predict mean extreme responses of tall buildings under wind excitations. Vanmarcke’s peak factor is directly related to an explicit measure of structural reliability against a Gaussian response process. We review the use of this factor for time-variant reliability design by comparing it to the conventional Davenport’s peak factor. Based on the asymptotic theory of statistical extremes, a new closed-form peak factor, the so-called Gamma peak factor, can be obtained for a non-Gaussian resultant response characterized by a Rayleigh distribution process. Using the Gamma peak factor, a combined peak factor method was developed for predicting the expected maximum resultant responses of a building undergoing lateral-torsional vibration. The effects of the standard deviation ratio of two sway components and the inter-component correlation on the evaluation of peak resultant response were also investigated. Utilizing wind tunnel data derived from synchronous multi-pressure measurements, we carried out a wind-induced time history response analysis of the Commonwealth Advisory Aeronautical Research Council (CAARC) standard tall building to validate the applicability of the Gamma peak factor to the prediction of the peak resultant acceleration. Results from the building example indicated that the use of the Gamma peak factor enables accurate predictions to be made of the mean extreme resultant acceleration responses for dynamic serviceability performance design of modern tall buildings.     

Are There Any Gender Differences in the Perception of University Support During the Transition Period to Higher Education?

The purpose of this study is to determine if there are gender differences in the perception of university support. The study is based on a survey of 368 students in a Hong Kong university. The findings of the study are threefold. First, female students perceive the university as being more supportive in their academic adjustment than do male students (t = ?4.256, p < 0.001). Second, male students perceive the university as being more supportive in their social adjustment than do female students (t = 2.156, p < 0.05). Last, male students perceive the university as being more supportive in their psychological adjustment than do female students (t= 2.401, p < 0.05).

     

Perspectives of new trades tutors: boundary crossing between vocational identities

This article reports on a study of the perspectives of new tutors teaching traditional vocational trades who recently commenced teaching in the Institutes of Technologies and Polytechnics (ITPs) sector in New Zealand. The perspectives are collated from questionnaires and interviews of 13 tutors, from five ITPs, who have been teaching full-time for two years. In this article, a focus is made on the transformation process from expert trade worker to effective trades tutor, along with suggestions to assist the ‘boundary crossing’ process between two diverse vocational identities. Suggestions include aligning trades tutors' existing workplace training-based conceptualisations of teaching and learning to extend trades tutors' teaching craft knowledge, skills, and dispositions.     

分布式计算的两种实现方案：JavaRMI和CORBA

分析了两种实现分布式计算的方案：JavaRMI和cORBA,简述了前者的工作原理,简单叙述了后者的原理并结合Java语言简述了简单代码,对两者的区别阐述,便于根据实际情况进行两种方案的取舍。