国有企业人力资源管理的困境及对策

国有企业是我国国民经济的支柱,是我国社会主义制度的重要经济基础.国有企业改革是我国经济体制改革的中心环节.过去的一段时间,国有企业改革在制度建设、结构建设等方面取得了较好的成绩.但是,从人力资源管理角度来说,重视的程度还不够,采取的措施还不到位,如果不充分认识到这一点,将对下一步的改革的发展带来一定的阻碍.     

垂直拉紧装置在带式输送机中的结构优化

垂直拉紧装置是带式输送机系统正常生产运行中不可或缺的部分。拉紧装置的作用就是保证带式输送机有足够的张力,以防止带式输送机在驱动滚筒上打滑或在托辊间产生过大的挠度。在塞内加尔钛铁矿项目中,根据实际空间情况又中和了用户的需求对垂直拉紧装置进行结构优化。即实现了相同的使用功能,又可极大地满足了用户要求。     

Control for Modified University of Cape Town Process Using Oxidation-Reduction Potential in the Second Anoxic Zone

The aim of this work is to evaluate the feasibility of applying the technology of oxidation-reduction potential(ORP)control on the municipal wastewater treatment system for nitrogen and phosphorus removal.Meanwhile the relation between the optimal ORP(ORP opt)and influent C/N ratio was evaluated,in which the influent chemical oxygen demand(COD)concentration was stabilized at(290±10)mg/L,the influent total phosphorus(TP)concentration was stabilized at(7.0±0.5)mg/L.The results indicated that:(1)the ORP in the second anoxic zone had effect on nitrogen and phosphorus removal capability,and the average percentages of phosphorus uptake in ANO2zone(ηa)increased with increasing ORP,i.e.,increasing from 12.0%at-143 mV to22.0%,30.0%,37.0%,and 45.0%at-123,-111,-105 and-95 mV,respectively;(2)the ORP opt as function of influent C/N ratio could be calculated by the equation:y=252.73e(-x/3.39)-131.01;the maximum percentage of phosphorus uptake in ANO2as function of the ORP opt could be calculated by the equation:y=-0.49 e(x/15.58)+1.51.The ORP opt was the important process control parameter that must be optimized for operation of enhanced biological phosphorus removal(EBPR)system.Moreover,ORP sensor is very simple,and the industrial applications of this strategy is practical.     

带式输送机头部漏斗、溜槽的设计

本文结合塞内加尔项目,阐述了头部漏斗、溜槽的设计计算过程,尤其提出了带弧形调节挡板这一新型结构的头部漏斗,对设计人员能起到了一定的参考、启发作用。     

复极电催化氧化对苯二酚废水实验研究

通过静态实验研究对苯二酚废水(300mg·L-1)在复极性三维电解槽中的电化学氧化过程,考察了填料质量比例、电解电压、支持电解质浓度以及初始pH值对对苯二酚和CODCr去除效果的影响。结果表明:随施加电压的增加,对苯二酚和CODCr去除率先升高后降低再升高;在弱碱(pH=8.5)条件下,对苯二酚CODCr去除率最高;电解质浓度和填料质量对对苯二酚降解影响较大。当电解质Na2SO4浓度为0.03mol·L-1,电压值为6V,初始pH值为8.5,填料质量比例为1:2时,对苯二酚和CODCr去除率分别达到83.96%和39.9%。     

Biomass Fraction of Phosphate-Accumulating Organisms Grown in Anoxic and Aerobic Stages under Optimum Nitrate Concentration

The effects of nitrate concentration on the capability of phosphorus uptake in the main anoxic stage were investigated.Meanwhile, the biomass fractions — heterotrophs, phosphateaccumulating organisms（ PAOs）,and nitrifying organisms in a pilot-scale enhanced biological phosphorus removal（ EBPR） system— were both experimentally and theoretically evaluated（ from the mass balance calculations of organic matter, nitrogen and phosphorus）,under optimum nitrate concentration in the main anoxic stage,in which the influent chemical oxygen demand（ COD）concentration was stabilized at（ 290 ± 10） mg·L^- 1and the influent total phosphorus（ TP） concentration was stabilized at（ 7. 0 ± 0. 5）mg · L^- 1. In long term operations,the process exhibited high performance in removing organic matter, nitrogen, and phosphorus. Approximately 46. 41% of organic matter,57. 21% of nitrogen,and 48. 14% of phosphorus were removed from the influent in the form of carbon dioxide,nitrogen gas,and polyphosphate,respectively. XH（ heterotrophs）,XPAO（ PAOs）,and XAUT（ autotrophs） were regarded as the major organisms responsible for biomass production. The yield fractions of XHgrowth in the first anoxic,the second anoxic,and the aerobic stages were 10. 24%,19. 11%,and 19. 71%,respectively; the yield fractions of XPAO growth in the second anoxic and the aerobic stages were 24. 34% and19. 86%,respectively; the yield fraction of XAUTgrowth in the aerobic stage was 6. 74%. These results showed that XHand XPAOformed the major community. Moreover,a higher amount of XPAOgrowth on stored poly-hydroxyalkanoates（ PHAs） under the anoxic condition was seen in this EBPR system for municipal wastewater treatment.     

印度14.2公里带式输送机拉紧装置组合的设计

印度Reliance Sasan项目14.2公里带式输送机具有长距离、大运量、地形复杂等特点,本文介绍了其拉紧装置组合各部件的设计。     

微机五防系统存在的问题及改进措施

分析了变电站微机五防闭锁的现状及存在的问题,对微机防误闭锁系统存在问题的提出相应的改进措施,以逐步完善微机防误闭锁系统程序。