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省历史学会、省图书馆于九月十二日上午在长沙市青少年宫联合举办了纪念辛亥革命七十周年报告会。报告会由副省长、省政协副主席、纪念辛亥革命七十周年筹委会主任程星龄主持,省历史学会理事长、中南地区辛亥革 相似文献
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入世以来,中铁十六局集团三公司紧抓机遇,适应挑战,使人才积极与市场对接,努力实施人才强企战略,使企业发展步入了快车道。他们的主要做法是:一、创造环境,吸引人才。以工程项目管理为重点,先后制定出台了项目部人才标准与市场标准对接的相关措施,项目部需要什么样的人才,就选择、重用什么样的人才。自2000年以来,引进各类大专院校毕业生352名,同时还通过人才市场、报刊广告、互联网等多种渠道招聘项目上急需的专业技术人才12名,都依法与其签订相关协议和劳动合同。二、不拘一格,使用人才。三公司领导在用人方面不断更新观念,不用“完人”标… 相似文献
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Orthogonal method was adopted to optimize the preozonation process and to minimize the bromate formation. Factors such as contact time, pH and ammonia concentration were investigated by orthogonal experiments to understand the interaction of various operation conditions on the formation of bromate and other disinfection byproducts （DBPs）. Results showed that pH had the most significant influence on the minimization of bromate formation. The factors influencing the formation ofbromate were in order ofpH 〉 contact time 〉 ammonia concentration. For the formation of trihalomethanes （THMs） and haloacetic acids （HAAs）, however, contact time significantly influenced their formation potential. In the practical preozonation process of waterworks, it is appropriate to set preozonation contact time to be 20 min. In order to minimize the formation of bromate, pH value of the raw water should be adjusted to 6.0, and a certain concentration of ammonia could be added into the water to strengthen the minimization effect when the concentration of bromide in the raw water is higher than that in the experimental water. 相似文献
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In order to investigate the eutrophication degree of Yuqiao Reservoir, a hybrid method, combining principal component regression (PCR) and artificial neural network (ANN), was adopted to predict chlorophyll-a concentration of Yuqiao Reservoir’s outflow. The data were obtained from two sampling sites, site 1 in the reservoir, and site 2 near the dam. Seven water variables, namely chlorophyll-a concentration of site 2 at time t and that of both sites 10 days before t, total phosphorus(TP), total nitrogen(TN), dissolved oxygen(DO), and temperature from January 2000 to September 2002, were utilized to develop models. To remove the collinearity between the variables, principal components extracted by principal component analysis were employed as predictors for models. The performance of models was assessed by the square of correlation coefficient, mean absolute error (MAE), root mean square error (RMSE) and average absolute relative error (AARE). Results show that the hybrid method has achieved more accurate prediction than PCR or ANN model. Finally, the three models were applied to predicting the chlorophyll-a concentration in 2003. The predictions of the hybrid method were found to be consistent with the observed values all year round, while the results of PCR and ANN models did not fit quite well from July to October. 相似文献
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A pilot-scale ultrafiltration membrane plant was set up for treating Luanhe River water with flocculating and precipitation process of waterworks.The aim is to investigate the variation and characteristics of natural organic matter and disinfection byproducts formation potential in the whole process in winter.The results show that dissolved organic matter(DOM),UV254,trihalomethanes formation potential(THMsFP) and haloacetic acids formation potential(HAAsFP) of Luanhe River water were mainly distributed in t... 相似文献
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