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排序方式: 共有255条查询结果,搜索用时 15 毫秒
1.
陈觎 《计算机光盘软件与应用》2012,(4):134-135
目前计算机、网络技术的发展和应用日益普及,大力发展人才开发事业是当前任何企事业单位的迫切需求,使得目前人才库建设的任务日益繁重,借助于计算机网络实现人才库系统建设是一个重要的发展趋势。本文根据地方政府管理部门对人才资源的管理需求,分析了建设人才资源数据库系统的功能要求与需求特点,并根据系统的特点,分析了人才资源数据库的实体一关系,对于重要功能模块进行了设计与测试。 相似文献
2.
一种基于人员定位的矿井综合通信系统 总被引:14,自引:0,他引:14
针对目前矿井井下通信系统功能不完善,技术与实现复杂的现状,提出了一种基于井下人员定位的综合通信监控系统。详细介绍了定位原理与具体实现过程,给出了系统中关键设备基站(BS)与人载通信器的结构原理图,并对综合通信与监控功能的实现进行了分析,最后给出了CMC管理软件的系统功能框图。 相似文献
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This paper describes the design and application of the Atmospheric Evaluation and Research Integrated model for Spain (AERIS). Currently, AERIS can provide concentration profiles of NO2, O3, SO2, NH3, PM, as a response to emission variations of relevant sectors in Spain. Results are calculated using transfer matrices based on an air quality modelling system (AQMS) composed by the WRF (meteorology), SMOKE (emissions) and CMAQ (atmospheric-chemical processes) models. The AERIS outputs were statistically tested against the conventional AQMS and observations, revealing a good agreement in both cases. At the moment, integrated assessment in AERIS focuses only on the link between emissions and concentrations. The quantification of deposition, impacts (health, ecosystems) and costs will be introduced in the future. In conclusion, the main asset of AERIS is its accuracy in predicting air quality outcomes for different scenarios through a simple yet robust modelling framework, avoiding complex programming and long computing times. 相似文献
4.
Taneli Rantaharju Neil J. Mansfield Jussi M. Ala-Hiiro Thomas P. Gunston 《Ergonomics》2015,58(7):1071-1087
In this paper, alternative assessment methods for whole-body vibration and shocks are compared by means of 70 vibration samples measured from 13 work vehicles, deliberately selected to represent periods containing shocks. Five methodologies (ISO 2631-1:1997, BS 6841:1987, ISO 2631-5:2004, DIN SPEC 45697:2012 and one specified by Gunston [2011], ‘G-method’) were applied to the vibration samples. In order to compare different evaluation metrics, limiting exposures were determined by calculating times to reach the upper limit thresholds given in the methods. Over 10-fold shorter times to exposure thresholds were obtained for the tri-axial VDV (BS 6841) than for the dominant r.m.s. (ISO 2631-1) when exposures were of high magnitude or contained substantial shocks. Under these exposure conditions, the sixth power approaches (ISO 2631-5, DIN SPEC, G-method) are more stringent than a fourth power VDV method. The r.m.s. method may lead to misleading outcomes especially if a lengthy measurement includes a small number of severe impacts. In conclusion, methodologies produce different evaluations of the vibration severity depending on the exposure characteristics, and the correct method must be selected. 相似文献
5.
信息安全风险评估不仅是有效保证信息安全的前提,也是制定信息安全管理措施的依据之一。信息安全风险评估标准作为风险评估的基础与依据,在评估过程中更是发挥着越来越重要的作用。通过将信息安全风险评估标准划分为管理类、技术类、评估方法类等三类标准,并以标准制定的目标为依据在各类内进行标准的异同比较与分析,以期能够更好的指导我国信息安全风险评估工作。 相似文献
6.
An experimental method for obtaining the effective stress intensities necessary for cyclic crack growth prediction is described. Also, it is shown that the critical threshold value, ΔKc, th, can be estimated using simple energetic considerations, leading to an equation: The threshold values obtained compare well with the experimentally observed values for a structural steel BS 4360-50D and for other steels. 相似文献
7.
J.C. Radon 《International Journal of Fatigue》1982,4(3):161-166
The prediction of fatigue crack growth at very low ΔK values, and in particular for the threshold region, is important in design and in many engineering applications. A simple model for cyclic crack propagation in ductile materials is discussed and the expression developed. Here, n is the cyclic strain hardening exponent, σyc is cyclic yield, and εf is the true fracture strain. The model is successfully used in the analysis of fatigue data BS 4360-50D steel. 相似文献
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