Basic skill requirements for selected Army occupational training courses

This study investigated the basic cognitive skills soldiers must possess before entering the Army, skills that are needed for successful completion of entry-level training. Judgments of 126 instructors from 25 military occupational specialties were obtained on 129 candidate skills, which resulted in the identification of 55 basic skills. Factor analysis of these 55 skill items resulted in 11 interpretable factors. Mean scores on the factors were compared across factors and across Army training schools. The results of the study suggest that, for all occupational specialties studied, skills related to the learning process are as crucial as traditional academic skills for successful training course completion. These results have important implications for training for the Army as well as for industry.     

青年男子排球运动员弹跳力模型

弹跳力是排球运动员的一项最重要的专项素质,为了探索发展青年男子排球运动员弹跳力的有效途径,以四川、重庆青年男子排球运动员为研究对象,对他们有关弹跳力的多种因素进行了相关、多元分析,进而制定出发展弹跳力的回归模型,为青年男子排球运动员弹跳力提供一个模型标准和参考.     

数据挖掘在水环境分析信息化中的应用

介绍了数据挖掘的基本概念及应用背景，讨论了作为复杂巨系统的水环境分析系统的信息特性及其不确定性，建立基于水流历史数据的未来水质指标预测的模型，传统的基于数学建模方法的局限性决定其无法解决这些难题；对应用数据挖掘技术处理水环境分析系统的某些具体问题进行了分析。     

"五霸"考释

"五霸"之说历来纷繁,前人以为有"三代五霸"与"春秋五霸"之别.实际上,任何一个"五霸"说都不是以某一标准(如主持盟会、天子赐伯等)可以归集的,"五霸"的概念是随着时间的变化而不断发展变化的,这是一个动态的概念.     

南水北调中线工程水源地旅游可持续发展研究

丹江口水库作为南水北调中线工程水源地，一方面要保护水源地环境，一方面要满足日益增长的旅游需求，成为地方脱贫致富的支柱产业。因此，水源地旅游要实现可持续发展，就要在保护环境的前提下，明确发展方向，培育核心竞争力，采取积极有效的发展策略。     

一种远距离水位单片机智能监控系统

设计与论证一种基于AT89C51和MODEM的远距离水位智能监控系统,以普通电话线为通信线路,实现了相距约11km的蓄水池与水库泵站之间水位数据的实时传输、显示和自动控制.     

金圣叹的小说结构技巧论初探

金圣叹在评点《水浒传》时，着力探讨了长篇小说的结构技巧。首先，小说结构应是一个有机的整体；其次，小说结构应具有形式美。我们对此进行了较详细的探讨，这对建构具有民族特色的小说美学，对当今的长篇小说创作都是十分有益的。     

新疆城市环境与生态问题

本文主要论述了自然扬尘污染、水资源污染、土地资源的污染对新疆城市环境和生态环境的危害和造成的直接影响，最后提出了解决新疆城市环境与生态问题。     

Numerical investigation of cavitating flow behind the cone of a poppet valve in water hydraulic system

Computational Fluid Dynamics (CFD) simulations of cavitating flow through water hydraulic poppet valves were performed using advanced RNGk-epsilon turbulence model. The flow was turbulent, incompressible and unsteady, for Reynolds numbers greater than 43000. The working fluid was water, and the structure of the valve was simplified as a two dimensional axisymmetric geometrical model. Flow field visualization was numerically achieved. The effects of inlet velocity, outlet pressure, opening size as well as poppet angle on cavitation intensity in the poppet valve were numerically investigated. Experimental flow visualization was conducted to capture cavitation images near the orifice in the poppet valve with 30° poppet angle using high speed video camera. The binary cavitating flow field distribution obtained from digital processing of the original cavitation image showed a good agreement with the numerical result. Project supported by the National Natural Science Foundation of China (No. 59835160) and Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry of China (No. 50175097)     

Modeling water and carbon fluxes above summer maize field in North China Plain with back-propagation neural networks

INTRODUCTION Dynamics of carbon and water vapor fluxesexchange between the atmosphere and the ecosystembiosphere, depend on complex and non-liner interplayamong physiological, ecological, biochemical andedaphic factors and meteorological conditions (Jarvis,1995; Leuning et al., 1995). There are many studiesquantifying the fluxes across different time and spacescales as well as assessing the environment con-straints on them by some kinds of biophysical orempirical models whose resul…