A new chemical vapour deposition (CVD) technique is presented. It is especially advantageous for the deposition of compound materials. The technique improves the uniformity and reproducibility of the deposition. The economical use of gaseous reactants is improved by a factor varying between 5 and 20. This is important in the case of expensive metal-organic CVD methods. The method consists in th...

Feasibility study on nuclear seawater desalination plant in which a 200 MW nuclear heating reactor (NHR-200) couples with MED processes has being finished at Institute of Nuclear Energy Technology (INET) of Tsinghua university in China, the Chinese government has agreed to built the kind of nuclear seawater desalination plant in Shandong peninsula of China. Two different kinds of MED processes,...

Abstract: Limited water resources and ensuring access to clean water are critical environmental challenges, especially for the developing world. In particular, rural domestic wastewater has become a significant source for the pollution of freshwater bodies. A modified bio-ecological A2O-wetland system for rural wastewater treatment consisting of a biological unit (anaerobic baffled reactor, ano...

A fluidized bed system combining two circulating fluidized bed reactors is proposed and investigated for chemical looping combustion using metal oxides as oxygen carriers. The global solids loop starts in one of the two reactors (primary reactor) where solids are entrained, separated from the gas in a cyclone and sent to the other reactor (secondary reactor) via a fluidized loop seal. From the ...

In order to take advantage of heat released during composting, the autothermal drying process requires the maintenance of adequate air flow combined with temperature. The aim of this paper was to construct a drying tunnel enabling the automatic control and regulation of the basic process parameters for biomass drying (organic fraction of municipal solid waste together with plant structural mate...

3C-SiC films have been grown on [100] n-doped Si substrates in a horizontal cold wall CVD reactor. Without the use of plasma enhancement, precursors silane and propane are used to deposit silicon carbide at T < 1200°C. The structure has investigated via FESEM, XRD Raman spectroscopy. It found that growth rates between 200 300 nm/h. Additionally, structural analysis give evidence polycrystall...

The neutron yield in a D-He reactor is much lower than that in a D-T reactor of equivalent power. Therefore, the rate of neutron damage and gas production in the first wall of D-He reactors is lower by more than an order of magnitude. Whereas different structural materials proposed for use in commercial fusion reactors will last the reactor lifetime of 30 full power years in a D-He reactor, fre...

Reactor control and safety systems are discussed with emphasis on safety considerations. Consideration is given to the importance of reactor characteristics, control and safety system characteristics, the operational program of the reactor, and credible accidents, in a determination of safety of operation. Ecperience with research reactor control and safety systems has led to the development of...

background: constructed wetlands (cw s ) are mimic filtration process in natural wetlands that effectively remove variety pollutants from wastewater. the main objective was the feasibility evaluation for using of subsurface flow constructed wetland in nitrogen and phosphorus removal from synthetic based on domestic wastewater in lab scale. methods: in this study, a synthetic wetland subsurface ...

Fire phenomena are complex and involve non-linear interactions between environmental and fire parameters. Computer based methods (Field model and Zone models), by use of numerical methods applyied on mathematical models in the form of differential equations have been widely used for predicting the results of fire phenomena. In the present work an Artificial neural network (ANN) model has been u...