摘要：石化企业的调度和管理装置逐渐进入周期性的维护运行机制,这就要对企业设备的安全运行风险增大提出定期的排查和隐患整治工作的要求。加强石化企业的调查管理力度,在助力装置平稳运行、平稳操作的情况下,保证石化企业的优化运行,才能实现降低能耗、增强生产时效的工作效果。

摘要：介绍了新发布的天津市地方标准《城镇污水处理厂污染物排放标准》(DB12/599-2015)制订的必要性、编制原则、适用范围、控制项目选择与分类、排放限值及确定依据、达标技术等。该标准对城镇污水处理厂出水排放标准按污水处理规模分A、B、C三级;设计规模≥10 000 m^3/d的城镇污水处理厂执行最严格的A标准,其主要污染物控制指标限值提高到《地表水环境质量标准》(GB 3838-2002)Ⅳ类水平。该标准的颁布实施对改善天津市水环境质量和污水资源化利用具有重要意义。

摘要：许多微型无线广播发射器都是采用日本ROHM公司生产的BA1404芯片设计的,比分立元件的性能大为提高且具有立体声调制功能。本文以典型的电路为基础,联系实际应用进行了改进,主要改进内容为BA1404周边元件和提高发射功率。

摘要：[Objective]The aim was to explore effects of curing technique parameters on chemical components and aromatic material accumulation to formulate a suitable curing technique and for and to achieve tobacco scalding, drying and giving aromat- ic flavor. [Method] With tobacco variety KRK 26 as test materials, the test involved parameters of three curing-techniques in down, middle and upper parts of flue-cured tobaccos in an oven to measure chemical components and aromatic substances in tobaccos. [Result] The effects of curing techniques on total sugar and reducing sug- ar differed upon temperature and humidity. The contents of chemical components, such as total alkaloid, total N and the ratio of sugar/ alkali by moderate temperature and high humidity technique were of significant differences with those by moderate temperature and moderate humidity technique and with low temperature and low hu- midity technique; the chemical components by moderate temperature and moderate humidity were of insignificant differences with the treatment by low temperature and low humidity technique. Total amount of aroma components by different curing tech- niques from high to low was the treatment by low temperature and low humidity technique （461.72 μg/g）, the treatment by moderate temperature and moderate hu- midity technique （450.06μg/g） and the treatment by moderate temperature and high humidity technique （385.12μg/g）, suggesting the content of aromatic substances is high at low temperature and low humidity. [Conclusion] Moderate temperature and high humidity curing technique has significant effects on total alkaloid, total N and the ratio of sugar/ alkali of tobaccos and different curing techniques also affect the total amount of aromatic substances of flue-cured tobaccos.