成都地区污染天气分型及其污染气象特征研究

污染天气分型研究对空气质量预报、污染源总量控制等具有重要的意义。基于2013年1月~2014年12月高空及地面天气形势划分了成都市的天气类型并探讨各天气类型下的空气质量状况及其污染天气特征,以期为空气质量预报和预警提供依据。结果表明,空气污染过程中,500 hpa环流形势主要有两槽一脊型、一槽一脊型、纬向型、槽脊同位相型等,其中两槽一脊型和槽脊同位相型控制下的空气质量最差。发生空气污染时,地面环流形势可分为高压型、高压后部型、高压底部型、低压型、低压顶部型、低压前部型、低压底部型、鞍型场型、冷锋前部型和均压场型,其中高压型、高压底部型、高压后部型控制下的空气质量最差。     

船用E500钢在海水中阴极极化氢脆敏感性研究

目的研究阴极保护电位对E500钢在海水中氢脆敏感性的影响。方法采用慢应变速率拉伸试验(SSRT),同时利用三电极体系进行不同电位极化,并结合扫描电镜进行试样断口观察。结果随着阴极保护电位负移,E500钢在海水中的氢脆敏感性增加,阴极保护电位为-0.95 V(vs.SCE)时,拉伸试样出现脆性解理断裂特征,电位为-1.00 V时,E500钢断口呈脆性断裂特征。结论根据氢脆系数拟合曲线得出,当氢脆系数达到25%时,E500钢最负阴极保护电位应为-0.913 V。     

基于ZLG500的智能卡门禁系统设计

介绍了基于智能卡读写模块ZL G500的门禁系统设计原理与方法,主要分析了该智能卡门禁系统中的数据存储与传输模块、系统主模块和时钟模块等重要组成模块的工作原理,同时给出了ZL G500与MCU的硬件接口及部分软件代码.本系统经过实际运行,具有稳定可靠、操作简便等特点.     

SLC500远程RIO网络在袋式除尘控制系统中的应用

以某钢铁厂配套大型脉冲袋式除尘器的控制系统为背景,通过具体的硬件配置、软件设计及系统结构介绍,阐述了一种基于SLC500的远程RIO控制系统解决方案,较好地实现了脉冲袋式除尘控制系统的自动运行,且实际运行效果良好.该系统具有很高的实时性、经济性和可靠性,在实际工业运用中,具有推广价值.     

Evaluation of the genotoxic and cytochrome P450 monooxygenase‐inhibitory potential of dicuran on procaryotic and eucaryotic test systems

Abstract

The effect of the herbicide Dicuran 500 FL (formulated product) on the phenotypical and genotypical changes in procaryotic and eucaryotic organisms was investigated using short‐term tests for detecting genotoxins. Since pesticides discharged in the water environment can modulate the mixed‐function monooxygenases (MFO) detoxification system of water organisms, the in vivo and in vitro effects of Dicuran on hepatic cytochrome P450 (cyt P450) monooxygenase activities were also examined in juvenile carp (Cyprinus carpio L.). By measuring the activities of MFO in experimental carp exposed to Dicuran an attempt was made to establish whether Dicuran could be bioactivated by MFO into ultimate mutagens. Our results on the bacterial strains Salmonella typhimurium TA100 and TA98 show that Dicuran does not possess either mutagenic or premutagenic characteristics. The micronucleus test on the erythrocytes of experimental carp did not establish any clastogenic effect either. However, Dicuran significantly inhibited the MFO activity of 7‐ethoxyresorufin‐O‐deethylase (EROD) and benzo[a]pyrene monooxygenase (BaPMO) in the liver of experimental carp in vitro, as well as in in vivo conditions. These findings demonstrate the potentially damaging effect of Dicuran on the xenobiotic metabolizing enzyme systems of fish, and suggest the applicability of described methods for the prediction of the ecotoxicological significance of the presence of pesticides in the water environment.     

Monel K-500合金在人造海水中的点蚀特征的研究

目的 研究Monel K-500合金在海水环境中的点蚀特征。方法 采用扫描振动电极技术(SVET)中的恒电流模式,研究Monel K-500合金点蚀的萌生及生长过程,通过扫描电镜(SEM)表征点蚀区域的形貌特征。结果 SVET结果显示,负电位会从点蚀中心位置向其边界区域转移,且更负的大阳极区能够吞并电位高的小阳极区。SEM结果显示,点蚀附近会发生TiC表面腐蚀产物的堆积、TiC周围基体的溶解及TiC的脱落。结论 钝化膜具有优异的自我修复能力,这是点蚀扩展缓慢的主要原因,且Monel K-500合金能够通过相互吞并、贯通的方式生长。Monel K-500合金点蚀的萌生主要与TiC的析出有关,可通过成分及工艺的优化来控制TiC的数量及分布,进一步提高合金的耐点蚀性能。     

STATE WATER QUALITY CONTROL PROGRAM IN ARIZONA1

ABSTRACT: Arizona's water pollution control program is based on authorties of Arizona Revised Statutes and Public Law 92–500, the Federal Water Pollution Control Act Amendments of 1972. The primary areas of this program are monitoring, facility inspections, plan review, planning, discharge permits and grants for the construction of publicly-owned waste water treatment facilities. The discharge permit program deals with control of point-source discharges and is administered by the United States Environmental Protection Agency. The planning and construction grants programs are administered by the State Water Quality Control Council and are implemented by the Bureau of Water Quality Control, which serves as staff to the Council. There are several challenges that face the State in this program. First is the adaptation of the “eastern law” to deal with Arizona's water quality problems. Second is to address problems caused by a long history of “laissez-faire” environmental quality management. Third is a mutual cooperation and coordination among the many entities involved in water resources management. Areas of particular interest in the State's program is the process setting water quality standards and the involvement of people of diversified backgrounds in the field of areawide planning under Section 208 of the Federal Water Pollution Control Act, which is primarily concerned with non-point sources of water pollution.     

基于多种预测模型的玉米低温冷害预测集成模型

引入大气环流特征量因子、500hPa高度场因子、太平洋海温因子以及预报量本身的均值周期因子等四类因子的低温冷害预测子模型来建立玉米低温冷害预测集成模型。利用该集成模型预报下一年温度等级时，将上一年的实况资料输入预测模型，滚动预测，克服了统计模型预报时效短的缺点，且试报准确性高，无错报。     

基于RC500的智能门禁控制系统研究

介绍了基于RC500的智能门禁控制系统的设计与开发,门禁控制器主要由射频天线、读卡模块、单片机控制系统及RS485通信接口组成,由RS500接口与PC机组成通信网络系统,并给出了AT89C52与MFRC500的接口原理图,对读卡程序进行了说明,最后给出了主要程序设计的流程图。     

环渤海地区500年来的旱涝变化及其区域分异

用研究区１４７０～１９８５年的旱涝等级资料，划分了该地区５００年来旱涝变化的７个阶段，讨论了不同阶段间旱涝型的变化及其旱涝型区域分异意义。结果表明，５００年来研究区有４类主要旱涝型，各型旱涝在不同阶段的重要程度及场型特征有较大差异，深刻反映了该地区５００年来旱涝区域分异特征的变化。通过对５００年来旱涝变化与温度变化的对比发现，较温暖期，研究区的旱涝型及旱涝区域分异格局较多变，旱涝变化的区域差异性较