桩基测试的理论模拟与结果分析

<正> 桩基的动态测量(包括桩基探伤与桩基静承载力测量)是近几年兴起的一门应用技术。与传统的桩基静荷测量法相比,它不但省时方便,经济实惠,而又能保证一定的精度,因而越来越得到建筑部门的广泛应用。本文试图用一维杆的振动模型,对桩基测试过程进行模拟,并对所得结果进行对比分     

散装氧化铝装卸作业粉尘浓度对周围环境影响的测试分析

散装氧化铝的装卸过程中类相似于散装化肥的装卸过程。在各个环节中散发出一定量的氧化铝粉尘，给港区及周转的大气环境带来一定影响。本文采用上下风向法测定总悬浮微粉物，筛分法测定氧化铝粉尘粒径分布并应用磁化原理测定粉尘颗粒的特性，在此基础上研究了探讨了散装氧化铝装卸作业粉尘浓度对周围大气环境的影响。     

Predicting herbicides concentrations in paddy water and runoff to the river basin

This study was conducted to investigate the dissipation pattern and runoff of herbicides to the river basin from the paddy fields. Pesticide paddy field model(PADDY) was applied to predict herbicide concentration in paddy fields. A field study was conducted in a paddy farm of Higashi Hiroshima City, Hiroshima Prefecture, Japan in the year of 2003 paddy season. The herbicides were mefenacet, thiobencarb, and bensulfuron methyl. The sample water was analyzed by using gas chromatography and HPLC after solid phase extraction. Predicted dissipation rate of thiobencarb in paddy water was higher( DT50=4.36) than that measured, with a lower k value(-0.069). Two weeks after application no thiobencarb was detected in the drainage channel and down stream. In the down stream, thiobencarb was detected until 3d after application, with a range of 0.02% to 0.08% of applied herbicide. The predicted dissipation rate(k) and half-life (DT50) of mefenacet was not significantly different from that of measured. In the drainage channel, upstream and downstream mefenacet was found during the whole study period. In downstream, the maximum concentration of mefenacet was present 0.6l % of applied in the paddy field on 3DAH. The dissipation rate(k) of BSM varied from -0.0860 to -0.1059 to with half-life(DT50) 3.5 and 2.84 d. In upstream water, no BSM was detected except trace amounts(0.01μg/L) at 3d after application. However, in the drainag echannel 8%, 6% and 1.58% of applied BSM was present at 0, 1 and 3 d after application respectively. In the down stream, the highest concentration was 1.06%, shortly after application.     

沈阳市饮食业油烟排放现状及油烟测试、分析过程中应注意的问题

结合实际监测数据介绍了沈阳市油烟排放状况,对污染情况进行了分析,对油烟监测、分析方法中的相关问题进行了探讨,提出了油烟污染控制对策及建议。     

一种新型的带放大器的压杆式压电压力传感器及其在爆炸测试？…

介绍了一种新型带放大器的压杆式压电压力传感器。该传器采用压电陶瓷作为敏感元件。为提高其响应速率,采用带声收杆式的结构;并充分考虑到测试专用设备的特殊构造,放置放大器及电池的需要,采了特殊的外观及内腔结构;为提高传感器及其测试系统的响应速率,采用具有高输入阻抗５０ΩＬ输出阻抗的电压放大器,同时也采用ＳＹＶ－５０－７－１较粗的射频传输电缆,减少了爆炸与冲击模拟信号的传输畸变。该传感器经过爆炸沿及罐压力     

我国烟尘测试技术的进展

我国烟尘测试技术大到可分类为三种基本类型；手动烟尘测试技术，自动烟尘测试技术和烟尘浓度直读测试技术。手动技术的特点是用人工的方法调节转子流量计，实现等速采样，自动技术是由微电脑控制抽气泵电机的转速或流量代的开度实现等速采样；直读技术是先建立和工法测定烟尘浓度与仪器示值之间的关系，然后利用关系曲线实现烟尘浓度直读。     

河流污染总量监测方法的探索

对河流流量测量的简易方法及其方法的技术参数做具体的介绍,与其他一些传统的测量方法相比,简易测量法具有测量准确、操作简便易行、省钱、省时、省力等特点,是河流污染物总量监测里很实用的方法。     

我国机动车排放测量设备的发展趋势

分析我国机动车排放测量技术发展情况，简介目前国内外常用排放仪器设备，借鉴发达国家的经验，并讨论我国机动车排放测量设备的发展方向。