External filtered neutron beams have been developed at the horizontal radial channels No. 4 of Dalat research reactor. In the material composition of the neutron filters, the primary material components of Iron, Alumi...External filtered neutron beams have been developed at the horizontal radial channels No. 4 of Dalat research reactor. In the material composition of the neutron filters, the primary material components of Iron, Aluminum, Nickel and Vanadium are used to obtain the mono-energetic neutron beams of 24 and 59 keV, with low level of Gamma and slow neutron background. A computer code and Monte-Carlo simulation technique were applied to optimize the filter configurations and to deduce the neutron energy distributions in the filtered beams. A hydrogen-filled proton recoil detector and the activation method with Gold foils were used to measure the neutron energy spectrum and flux of each beam at sample position. The results of experimental neutron fluxes are 6.1 × 105 and 5.3 × 105 n/cm2/s for 24 and 59 keV beams, respectively.展开更多
以广东省某污水处理厂为例,建立“厌氧-缺氧-好氧(Anaerobic-Anoxic-Oxic,A^(2)O)-移动床生物膜反应器(Moving Bed Biofilm Reactor,MBBR)+高效沉淀池+纤维转盘滤池”工艺系统,成功解决了城市污水处理厂中氧化沟池容不足和池型设计缺陷...以广东省某污水处理厂为例,建立“厌氧-缺氧-好氧(Anaerobic-Anoxic-Oxic,A^(2)O)-移动床生物膜反应器(Moving Bed Biofilm Reactor,MBBR)+高效沉淀池+纤维转盘滤池”工艺系统,成功解决了城市污水处理厂中氧化沟池容不足和池型设计缺陷等问题,同时实现了污水处理出水的提标,使出水水质稳定达标。改造后,每吨水每天的运营成本约为0.52元。展开更多
文摘External filtered neutron beams have been developed at the horizontal radial channels No. 4 of Dalat research reactor. In the material composition of the neutron filters, the primary material components of Iron, Aluminum, Nickel and Vanadium are used to obtain the mono-energetic neutron beams of 24 and 59 keV, with low level of Gamma and slow neutron background. A computer code and Monte-Carlo simulation technique were applied to optimize the filter configurations and to deduce the neutron energy distributions in the filtered beams. A hydrogen-filled proton recoil detector and the activation method with Gold foils were used to measure the neutron energy spectrum and flux of each beam at sample position. The results of experimental neutron fluxes are 6.1 × 105 and 5.3 × 105 n/cm2/s for 24 and 59 keV beams, respectively.
文摘以广东省某污水处理厂为例,建立“厌氧-缺氧-好氧(Anaerobic-Anoxic-Oxic,A^(2)O)-移动床生物膜反应器(Moving Bed Biofilm Reactor,MBBR)+高效沉淀池+纤维转盘滤池”工艺系统,成功解决了城市污水处理厂中氧化沟池容不足和池型设计缺陷等问题,同时实现了污水处理出水的提标,使出水水质稳定达标。改造后,每吨水每天的运营成本约为0.52元。
