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      • Effect of process conditions on the synthesis of carbon nanotubes by catalytic decomposition of meth

        A new dual-composition catalyst based on Ni-Mo/MgO with high efficiency of producing carbon nanotubes (CNTs) from methane was reported recently. In the present article, with this type of catalyst, the impact of such experimental parameters as reaction temperature, reaction time,concentration of H2, flow rate ratio of CH4 to H2 on yield and graphitization were investigated, leading to the following optimal growth conditions:synthesized. Raman measurement indicated that the as-synthesized product was well-graphitized, and the purity was estimated over 95% by TG-DSC analysis. In terms of the above results, an explanation of high-efficiency formation of CNTs bundles and the co-catalysis mechanism of Ni-Mo/MgO were suggested....

        2020-11-11 22:33:38瀏覽:32 carbonNanotubescatalyticdecompositionyieldgraphitizationdegree

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      • Experimental Study on Minimization of Sludge Production by Ozonation Process

        Based on the hypothesis of reducing sludge production under cryptic growth conditions, ozone was used as cell lysis agent to treat excess sludge,and then the ozonated supernatant was returned to the aeration tank. The results show that COD and NH+4-N removal efficiencies in ozonation process were 87.96% and 84.42%, respectively. Meanwhile, a low excess sludge yield coefficient of 0. 113 ( g SS/g COD removed) was obtained. Compared with that of the control test, the process configuration decreased the excess sludge production by 51.3%....

        2020-11-10 09:33:08瀏覽:21 ozonationsludgeminimizationcrypticgrowthexcessyield

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      • Modeling and Optimization of Catalytic Dehydration of Ethanol to Ethylene Using Central Composite De

        The central composite design in the modeling and optimization of catalytic dehydration of ethanol to ethylene was performed to improve the ethylene yield. A total of 20 experiments at random were conducted to in-vestigate the effect of reaction temperature, Si/Al ratios of H-ZSM-5 catalyst and liquid hourly space velocity (LHSV)on the ethylene yield. The results show that the relationship between ethylene yield and the three signifi-cant independent variables can be approximated by a nonlinear polynomial model, with R-squared of 99.9% and adjusted R-squared of 99.8%. The maximal response for ethylene yield is 93.4% under the optimal condition of 328 ℃, Si/Al ratio 85, and LHSV 3.8 h-1....

        2020-10-22 17:35:41瀏覽:17 Centralcompositedesigncatalyticdehydrationofethanolethyleneyield

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      • Influence of furfural concentration on growth and ethanol yield of Saccharomyces kluyveri

        Furfural is an important inhibitor in ethanol fermentation process using lignocellulosic hydrolysates as raw materials. In order to find out the furfural concentration range in which furfural inhibits the fermentation process, we used one strain Saccharomyces kluyveri selected from soil and cultured in several different furfural content media under low glucose concentration condition. Experiment results show that microorganism growth was stimulated and dry cell weight decreased when furfural concentration in the medium was 0.25 mg/ml. Furfural had negative effect on cell growth when its concentration was above 1.00 mg/ml. At the same time, the strain growed better and had higher glucose consumption rate in 5% original glucose concentration condition than in 3% original glucose concentration condition. The results show that appropriate exaltation of original glucose concentration in stalk hydrolysates will increase the strain resistance to furfural....

        2020-10-22 17:35:41瀏覽:20 furfuralconcentrationSaccharomyceskluyverifermentationgrowthethanolyield

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      • 綠藻生物質發酵生產燃料乙醇的研究?

        主要探討了利用綠藻作為生物質原料進行乙醇發酵的可行性及其發酵效果,考察了不同種類綠藻、硫酸濃度以及鈉離子濃度對乙醇產量的影響.研究結果證明石莼葡萄糖含量豐富,作為發酵乙醇的原料是十分有潛力的.預處理過程中最適硫酸濃度為2%,并利用氫氧化鈣調節pH 值為5.5時,其最大乙醇濃度可高達30 g/L,且產乙醇速率可達0.63 g/(L· h),乙醇產量為37 g/kg.在酶解存在的條件下,加大硫酸濃度水解對綠藻中葡萄糖的溶出并沒有很大幫助,主要影響其它五碳糖的溶出.鈉離子對發酵產乙醇過程的影響較大,鈉離子濃度過高會抑制乙醇產量以及產乙醇速率;而在氯離子存在的條件下,低鈉離子濃度便可對乙醇發酵產生嚴重抑制....

        2020-09-30 09:14:00瀏覽:24 綠藻酸解生物乙醇乙醇產量抑制greenalgaacidhydrolysisBioethanolyieldinhibition

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      • 高煤階煤層氣井煤粉產出對滲透率影響研究

        高煤階煤層氣井在鉆井、開采過程中由于機械碰撞、氣液沖刷、壓力波動等外力作用,不可避免的會產生煤粉,煤粉的產出一方面有利于形成氣液產出通道,但另一方面如果過快、過多的產出使氣水流動出現障礙,引起產氣量下降,同時頻繁的檢泵作業導致氣井的解吸一吸附過程交錯進行,嚴重影響了氣井的正常生產;本文通過煤粉產出與滲透率的關系、排采速度對煤粉產出的影響等室內模擬實驗,論證了高煤階煤層氣井煤粉產出控制的重要性。...

        2020-09-18 16:34:07瀏覽:49 高煤階煤粉產出控制highcoalrankyieldofdustscontrol

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      • Recent progress of nuclear liquid gas phase transition

        Recent progress on nuclear liquid gas phase transition (LGPT) has been reviewed, especially for the signals of LGPT in heavy ion collisions. These signals include the power-law charge distribution, cluster emission rate, nuclear Zipf law, bimodality, the largest fluctuation of the fragments, △ -scaling, caloric curve, phase coexistence diagram, critical temperature, critical exponent analysis, negative specific heat capacity and spinodal instability etc. The systematic works of the authors on experimental and theoretical LGPT are also introduced....

        2020-09-13 23:35:02瀏覽:25 nuclearliquidgasphasetransitionfragmentyielddistributionFisherdroplet

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      • Factors Influencing the Iterative Accuracy of Ground Water Level in Forecasting the Water Burst of D

        The purpose of this paper is to discuss the influential factors of iteration accuracy when we use iteration to determine the numerical model for predicting water yield of deep drawdown mines and calculating the groundwater level. The relationship among the calculation error of groundwater level, the pumping rate, the limit of iteration convergence error, the calculation time, and the aquifer parameters were discussed by using an ideal model. Finally, the water yield of Dianzi iron mine was predicted using the testified numerical model. It is indicated that the calculation error of groundwater level is related to the limit of iteration convergence error, the calculation time and the aquifer parameters, but not to the pumping rate and the variation of groundwater level....

        2020-07-08 08:49:41瀏覽:17 deepdrawdownwateryieldgroundwaterleveliterationerrorLimit

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      • Effects of Tillage Practices on Water Consumption, Water Use Efifciency and Grain Yield in Wheat Fie

        Water shortage is a serious issue threatening the sustainable development of agriculture in the North China Plain, with the winter wheat (Triticum aestivum L.) as its largest water-consuming crop. The effects of tillage practices on the water consumption and water use efifciency (WUE) of wheat under high-yield conditions using supplemental irrigation based on testing soil moisture dynamic change were examined in this study. This experiment was conducted from 2007 to 2010, with ifve tillage practice treatments, namely, strip rotary tillage (SR), strip rotary tillage after subsoiling (SRS), rotary tillage (R), rotary tillage after subsoiling (RS), and plowing tillage (P). The results showed that in the SRS and RS treatments the total water and soil water consumptions were 11.81, 25.18%and 12.16, 14.75%higher than those in SR and R treatments, respectively. The lowest ratio of irrigation consumption to total water consumption in the SRS treatment was 18.53 and 21.88%for the 2008-2009 and 2009-2010 growing seasons, respectively. However, the highest percentage of water consumption was found in the SRS treatment from anthesis to maturity. No signiifcant difference was found between the WUE of the lfag leaf at the later iflling stage in the SRS and RS treatments, but the lfag leaf WUE at these stages were higher than those of other treatments. The SRS and RS treatments exhibited the highest grain yield (9 573.76 and 9 507.49 kg ha-1 for 3-yr average) with no signiifcant difference between the two treatments, followed by P, R and SR treatments. But the SRS treatment had the highest WUE. Thus, the 1-yr subsoiling tillage, plus 2 yr of strip rotary planting operation may be an efifcient measure to increase wheat yield and WUE....

        2020-07-08 08:49:41瀏覽:23 winterwheattillagepracticewaterconsumptioncharacteristicsyielduse

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      • 通過抑制釀酒酵母乙醇發酵中的甘油產率提高乙醇產率

        In ethanol fermentation of Saccharomyces cerevisiae (S.cerevisiae),glycerol is one of t11e main by-products.The purpose of this investigation was to increase ethanol yield through minimizing glycerol yield by using mutants in which FPSl encoding a channel protein that mediates glycerol export and GPD2 encoding one of glycerol-3-phosphate dehydrogenase were knocked-out using one-step gene replacement.GLTl and GLNl that encode glutamate synthase and glutamine synthetase,respectively,were overexpressed using two-step gene replacement in fps1△Agpd2△ mutant.The fermentation properties of ZAL69(fps1△::JLEU2 gpd2△::URA3)and ZAL808(fps1△::LEU2 gpd2△::URA3 PPGKI-GL71 PPGKI-GLNI)under microaerobic conditions were investigated and compared with those of wild type(DC124).Consumption of glucose,yield of ethanol,yield of glycerol,acetic acid,and pyruvic acid were monitored.Compared with wild type.the ethanol yield of ZAL69 and ZAL808 were improved by 13.17%and 6.66%,respectively,whereas glycerol yield decreased by 37.4%and 41.7%.Meanwhile,acetic acid yield and pyruvic acid yield decreased dramatically compared to wild type.Our results indicate that FPS1 and GPD2 deletion of S.cerevisiae resulted in reduced glycerol yield and increased ethanol yield.but simultaneous overexpression of GLTl and GLN1-in fps1△gpd2△ mutant did not have a higher ethanol yield thall fps1△gpd2△ mutant....

        2020-06-12 15:10:22瀏覽:1385 Saccharomycescerevisiaeethanolyieldglycerolgeneknock-out

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      • 提高甲醇精餾得率

        針對低壓法合成甲醇,精餾采用節能型三塔精餾流程,分析影響甲醇精餾得率的原因,總結出提高精餾得率的優化措施。...

        2020-06-12 14:45:12瀏覽:1392 甲醇精餾得率方法methanoldistillationyieldmethod

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      • 通過抑制釀酒酵母乙醇發酵中的甘油產率提高乙醇產率

        In ethanol fermentation of Saccharomyces cerevisiae (S.cerevisiae),glycerol is one of t11e main by-products.The purpose of this investigation was to increase ethanol yield through minimizing glycerol yield by using mutants in which FPSl encoding a channel protein that mediates glycerol export and GPD2 encoding one of glycerol-3-phosphate dehydrogenase were knocked-out using one-step gene replacement.GLTl and GLNl that encode glutamate synthase and glutamine synthetase,respectively,were overexpressed using two-step gene replacement in fps1△Agpd2△ mutant.The fermentation properties of ZAL69(fps1△::JLEU2 gpd2△::URA3)and ZAL808(fps1△::LEU2 gpd2△::URA3 PPGKI-GL71 PPGKI-GLNI)under microaerobic conditions were investigated and compared with those of wild type(DC124).Consumption of glucose,yield of ethanol,yield of glycerol,acetic acid,and pyruvic acid were monitored.Compared with wild type.the ethanol yield of ZAL69 and ZAL808 were improved by 13.17%and 6.66%,respectively,whereas glycerol yield decreased by 37.4%and 41.7%.Meanwhile,acetic acid yield and pyruvic acid yield decreased dramatically compared to wild type.Our results indicate that FPS1 and GPD2 deletion of S.cerevisiae resulted in reduced glycerol yield and increased ethanol yield.but simultaneous overexpression of GLTl and GLN1-in fps1△gpd2△ mutant did not have a higher ethanol yield thall fps1△gpd2△ mutant....

        2020-03-23 18:18:47瀏覽:1394 Saccharomycescerevisiaeethanolyieldglycerolgeneknock-out

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      • 提高甲醇精餾得率

        針對低壓法合成甲醇,精餾采用節能型三塔精餾流程,分析影響甲醇精餾得率的原因,總結出提高精餾得率的優化措施。...

        2020-03-17 17:28:17瀏覽:1392 甲醇精餾得率方法methanoldistillationyieldmethod

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      [!--page.stats--] 被公玩弄的年轻人妻

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