This thesis chooses the Z-score index to measure commercial banks' risk-taking behavior. Then Panel data model is used to empirically analyze in the year from 2001 to 2008, it is indicated that by using non-linear...
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Today's university physics teaching is facing some difficulties such as short teaching hours and richer contents. This article firstly analyses the present situation of university physics. Then it points out that ...
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The matrix solid phase dispersion (MSPD) was applied to the extraction of eight kinds of ginsenosides from the leaves of Panax ginseng C.M. Mey. The experimental conditions were examined and optimised. The extracts we...
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The matrix solid phase dispersion (MSPD) was applied to the extraction of eight kinds of ginsenosides from the leaves of Panax ginseng C.M. Mey. The experimental conditions were examined and optimised. The extracts were analysed by high performance liquid chromatography (HPLC). When the diatomaceous earth was used as dispersant and 75% methanol was used as elution solvent, the highest extraction yields of the eight kinds of ginsenosides were obtained. For comparison, the reflux extraction was applied. The extraction yields obtained by the proposed method were comparable with those obtained by the reflux extraction. The proposed method is convenient, time-saving, and organic solvent minimising. (C) 2011 Published by Elsevier Ltd.
China enjoys rich lignite resources. However, the development and utilization level of lignite in China is low compared with other countries. The lignite in China is distributed mainly in the eastern areas of Inner Mo...
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ISBN:
(纸本)9781424462551
China enjoys rich lignite resources. However, the development and utilization level of lignite in China is low compared with other countries. The lignite in China is distributed mainly in the eastern areas of Inner Mongolia and in the northeast provinces. The characteristics of China's lignite are closely related to its coal-forming age. Due to the shallow buried coal seams, most parts of the lignite coalfields in China use adit or inclined shaft mining. In China, the application of lignite includes combustion for power generation, pyrolysis and coking, liquefaction, gasification and preparation of wax etc..
Coking wastewater was advanced treated by electrolytic experiment. Through the orthogonal method, we found out the optimum experimental condition as current density 20 mA/cm2, electrode plate span 1cm, electrolytic ti...
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ISBN:
(纸本)9783642233234
Coking wastewater was advanced treated by electrolytic experiment. Through the orthogonal method, we found out the optimum experimental condition as current density 20 mA/cm2, electrode plate span 1cm, electrolytic time 60 min, PH 7 and electrical conductivity 8000 mu s/cm. The removal rates of COD, NH3-N and phenol were 58.62%, 89.9% and 96.8% respectively and the corresponding concentrations were 97.78mg/L, 14.3mg/L and 0.43mg/L respectively, which can meet first discharge standard of GB 13456-1992.
This paper introduces the cleaner production processes of Hot Press Upgrading (HPU). Tail gas and lignite-derived water are created during the HPU process. When treated by the combined process of 'A2/O + Ozone oxi...
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Prepared a electrode with high concentration and strong active oxidizing property which used titanium as anode's substrate material, used gradient method the anode surface was coated with a definite ratio RuO(2), ...
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ISBN:
(纸本)9780878492015
Prepared a electrode with high concentration and strong active oxidizing property which used titanium as anode's substrate material, used gradient method the anode surface was coated with a definite ratio RuO(2), TiO(2), IrO(2), SnO(2), Ga and Ce in order to extend the operational life span. Use scanning electron microscope to present the surface property, the result shows that the surface coat of self-made titanium positive plate is densification and well-distributed which has good catalytic activity and reaction stability, meanwhile the surface coated with metallic oxides has less and short cracks which can extend the useful life. Through the electrochemistry property detection by electrochemistry workstation, Tafel curve shows that the chlorine precipitation potential is 1.41V which is just a little higher than the standard potential 1.36v of Cl(-) reacting to form Cl(2), meanwhile lower than the oxygen precipitation potential, these shows that the plate has good electro-catalysis property and selectivity. The self-made experimental setup includes four parts as direct supply, reactive tank, electrode, collecting bottle. Prepared solution with deionized water and analytical pure agents with NH(4)Cl and NaCl, with draining water method collecting the electro-catalysis gas and gas chromatographic analysis shows the main component includes N(2) 62.73%, O(2) 21.47%, H(2) 13.95%, Cl(2) 1.85%, meanwhile analysis the trends of nitrogen forms concentration, chloridion concentration and pH by electrolysis time, concluding that the indirect oxidation is dominant process during electrochemistry, active substrate OCl(-) is the principal oxidation. The electrolyte pH keeps range between 7.5 and 9.5 which is favorable to free ammonia forming that can be directly electrochemical oxidized, meanwhile is disadvantage of free chlorine forming that can keep cyclic utilization in solution.
Based on the characteristic of acrylic fiber manufacturing wastewater (AFMW),such as containing toxic and bio-refractory pollutants,the electrochemical oxidation is employed as an advanced treatment method,and the ope...
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ISBN:
(纸本)9781612843377
Based on the characteristic of acrylic fiber manufacturing wastewater (AFMW),such as containing toxic and bio-refractory pollutants,the electrochemical oxidation is employed as an advanced treatment method,and the operating conditions such as current density,NaCl concentration,initial pH,are *** addition,the bio-degradability prior to and after electrochemical treatment is *** the optimal operating parameters of current density 10 mA/cm2,NaCl concentration 2 g/L,pH 7.1,the ammonia (NH3-N) and chemical oxygen demand (COD) are reduced by 100% and 50.8%,*** the condition of current density exceeds 10 mA/cm2 or NaCl concentration exceeds 2 g/L,the increment of current density and NaCl concentration accelerate the NH3-N remove process,but it can not greatly enhance the COD removal efficiency of electrochemical *** neutral pH condition is optimal for COD removal.
Saturated coke as filler materials, experiment on the advanced treatment of coking wastewater by three-dimensional fixed bed electrode reactor was carried out. It was indicated that coke powder can be used as catalyti...
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