徐州市电磁辐射环境的污染现状调查及评价

调查了徐州市电磁辐射污染源的状况,分析了其电磁辐射环境质量的现状,并对全市电磁辐射环境质量进行了评价,指出了分析工作中存在的问题,提出了防治对策。     

论辐射事故发生原因和预防、解决措施

随着科学技术和社会经济的高速发展,核技术在工业、农业、医疗等领域得到了越来越广泛的应用,但其在带给人类巨大经济效益的同时,也给社会安全带来了潜在的威协,辐射事故时有发生,不仅污染环境,甚至危及人们的身体健康和生命。文中对辐射事故发生的类型、级别以及发生的原因进行了分析,提出了预防和解决的措施。     

环境电磁辐射测量比对

为考核辐射环境监测质量,浙江省辐射环境监测站组织了2010年全省辐射环境监测网络环境电磁辐射测量比对。采用稳健Z比分数法评价测量数据的一致性。结果表明,射频综合场强测量比对中,9台仪器测量结果满意,1台仪器测量结果离群。工频电磁场测量比对中,有9台仪器测量结果满意,2台仪器测量结果离群。88%的测量值为满意结果,12%为离群结果,测量比对有效地发现了测量仪器存在的问题,保证监测工作结果的准确性。     

5G基站电磁辐射环境特征及监测实证研究

根据5G基站工作原理及发射特点,研究了5G基站的电磁辐射方向、强度与用户终端位置分布及应用场景存在的对应关系.经实测验证,终端位置移动将导致电磁辐射方向发生显著变化;多终端窄波辐射相互叠加与应用场景明显相关,基站小区辐射覆盖范围扩大.建议对现行移动通信基站电磁辐射环境监测技术方法进行研究修订.     

核技术利用辐射安全监管法律法规解读

随着核技术日益广泛的利用,我国放射性同位素和射线装置技术的应用发展迅速,它在给人类带来巨大利益的同时也带来了辐射危害,安全隐患突出,安全监管任务重。本文就与核技术利用辐射安全监管有关的问题进行法律法规解读,以提高辐射安全监管依法行政能力。     

Prediction of global solar radiation using support vector machines

This article utilizes Support Vector Machines (SVM) for predicting global solar radiation (GSR) for Sharurha, a city in the southwest of Saudi Arabia. The SVM model was trained using measured air temperature and relative humidity. Measured data of 1812 values for the period from 1998–2002 were obtained. The measurement data of 1600 were used for training the SVM, and the remaining 212 were used for comparison between the measured and predicted values of GSR. The GSR values were predicted using the following four combinations of data sets: (i) Daily mean air temperature and day of the year as inputs, and global solar radiation as output; (ii) daily maximum air temperature and day of the year as inputs, and GSR as output; (iii) daily mean air temperature and relative humidity and day of the year as inputs, and GSR as output; and (iv) daily mean air temperature, day of the year, relative humidity, and previous day’s GSR as inputs, and GSR as output. The mean square error was found to be 0.0027, 0.0023, 0.0021, and 7.65 × 10^?4 for case (i), (ii,), (iii), and (iv) respectively, while the corresponding absolute mean percentage errors were 5.64, 5.08, 4.48, and 2.8%. Obtained results show that the SVM method is capable of predicting GSR from measured values of temperature and relative humidity.     

Available solar energy for flat-plate solar collectors mounted on a fixed or tracking structure

The solar energy received by a flat plate collector is calculated for various tracking modes: fixed, inclination depending on the season or the month; variable inclination with fixed azimuth, variable azimuth with fixed inclination and double tracking. At first, we take into account only the sun position and then, we use validated radiation models for estimating the ground solar radiation. Using a tracker is questionable particularly if the additional costs are taken into account. A good solution to increase the available solar energy is to change seasonally the inclination, that is, 4 times per year.     

Evaluation of various global solar radiation models for Nigeria

This study assessed the performance of six solar radiation models. The objective was to determine the most accurate model for estimating global solar radiation on a horizontal surface in Nigeria. Twenty-two years meteorological data sets collected from the Nigerian Meteorological agency and the National Aeronautics and Space Administration for the three regions, covering the entire climatic zones in Nigeria were utilized for calibrating and validating the selected models for Nigeria. The accuracy and applicability of various models were determined for three locations (Abuja, Benin City, and Sokoto), which spread across Nigeria using seven viable statistical indices. This study found that the estimation results of considered models are statistically significant at the 95% confidence level, but their accuracy varies from one location to another. However, the multivariable regression relationship deduced in terms of sunshine ratio, air temperature ratio, maximum air temperature, and cloudiness performs better than other relationships. The multivariable relationship has the least root mean square error and mean absolute bias error, not exceeding 1.0854 and 0.8160 MJ m^?2 day^?1, respectively, and monthly relative percentage error in the range of ± 12% for the study areas.     

某社保(终端/便民/访客)服务器终端EMC整改案例分析

介绍了某社保(终端/便民/访客)服务器终端在电子产品电磁兼容认证中经常遇见的辐射骚扰和传导骚扰测试项目,重点从PCB板级电路EMC设计方面进行测试不合格原因分析,并给出整改对策。并由此案例引出电子产品电磁兼容设计时的注意事项,以图能给电子产品设计工程师提供参考,使其能以较高概率一次性通过EMC认证。     

伽玛辐射测量中应注意的几个问题

对伽玛辐射测量时如何合理布点,测量结果的恰当表述,数据的科学运用与分析进行了阐述。