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Optimization of hydrogen production from agricultural wastes using mixture design

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 246-254页

作者： Liu Shuang Wang Chunying Yin Lili Li Wenzhe Wang Zhongjiang Luo Lina Heilongjiang Provincial Key Laboratory of Technology and Equipment for the Utilization of Agricultural Renewable Resources in Cold Region School of EngineeringNortheast Agricultural UniversityHarbin 150030China

Hydrogen production from food waste,cattle manure,potato pulp and pig manure was optimized through using mixture design in this *** synergic and antagonistic effects of the four substrates on hydrogen yield,substrate conversion efficiency and pH were *** results showed that the optimal proportion of food waste,cattle manure,potato pulp and pig manure were 61.6%,38.4%,0,and 0,*** the optimal condition,hydrogen yield of 21.0 mL/g VS with VS reduction of 29.4%and pH of 5 could be *** interaction between food waste and cattle manure had strongest synergistic *** was mainly produced by acetic-butyric metabolic pathway,and ammonification of protein played an important role in the maintenance of pH.

关键词： hydrogen biohydrogen production agricultural waste dark fermentation mixture design

Application of the mixture design to design the Formulation of Pure Cultures in Tibetan kefir

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Agricultural Sciences in China 2007年第11期6卷 1383-1389页

作者： ZHOU Jian-zhong LIU Xiao-li HUANG Kai-hong DONG Ming-sheng JIANG Han-hu Institute of Agro-Product Processing Jiangsu Academy of Agricultural Sciences Nanjing 210014 P.R. China College of Food Science and Technology Nanjing Agricultural University Nanjing 210095 P.R. China

To obtain the optimization formulation of pure cultures in Tibetan kefir, the influence of the different mixtures of five strains in the pure cultures in Tibetan kefir on the flavor components in fermented milk was studied using the mixture design. The regression model on microorganism composition and main metabolites was established. The results suggested that the predictable production of lactate reached the maximum of 8.16 g L-1, while the most predictable production of diacetyl, ethanol, and CO2 were 77.23 mg L-1, 4259 mg L-1, and 2.12 g L-1, respectively. Based on these, the response values that satisfied all expectations were optimized, and the most excellent combination was Lactococcus lactis 27%, Leuconostoc mesenteroides 37%, Lactobacillus kefiri 11%, Lactobacillus casei 10%, and Kluyveromyces rnarxianus 15%. With the aid of analysis software （design-expert 6.0.5）, the formulation of pure cultures in Tibetan kefir can be optimized for several responses and the best formulation can be obtained.

关键词： mixture design Tibetan kefir pure cultures optimization

Simplex - Centroid mixture design Applied to theAqueous Enzymatic Extraction of Fatty Acid - BalancedOil from Mixed Seeds

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大豆科技 2019年第S1期 1-8页

作者： Li Yang Zhang Yan Wang Mei Jiang Lianzhou Sui Xiaonan 不详

A one-step method was developed to extract oil from a mixture of soybeans,peanuts,linseeds,and tea seeds using an aqueous enzymatic *** proportion of the four seeds was targeted in accordance with a fatty acid ratio of 0.27(SFA,saturated fatty acid(s))∶1(MUFA,monounsaturated fatty acid(s))∶1(PUFA,polyunsaturated fatty acid(s)),and the oil extraction yield was maximized by applying the simplex-centroid mixture design *** models were developed for describing the relationship between the proportion of the individual seeds in the mixture,the fatty acid ratio in the extracted oil,and the oil extraction yield,*** developed models were then analyzed using an ANOVA and were found to fit the data quite well,with R2 values of 0.98,0.93,and 0.93,*** three models were validated *** results indicated that the ratio of fatty acids in the oil ranged between 0.98 and 1.12(MUFA∶PUFA)and between 0.26 and 0.28(SFA∶MUFA),which were quite close to the target values of 1 and 0.27,*** oil extraction yield of 62.13%was slightly higher than the predicted value(60.32%).

关键词： Oil blend Aqueous enzymatic extraction Fatty acids mixture design Mixed seeds

Precise Composition Tailoring of Mixed-Cation Hybrid Perovskites for Efficient Solar Cells by mixture design Methods

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Precise Composition Tailoring of Mixed-Cation Hybrid Perovsk...

design of Small Stone Asphalt mixture based on Anti-skidding Performance

第五届新型太阳能电池学术研讨会

作者： Liang Li Ligang Wang Huanping Zhou Happy Lab College of Engineering Peking University

Mixed anion/cation perovskites absorber has been recently implemented to construct highly efficient single junction solar cells and tandem devices. However, considerable efforts are still required to map the composition-property relationship of the mixed perovskites absorber, which is essential to facilitate device design. Here we report the intensive exploration of mixed-cation perovskites in their compositional space with the assistance of a rational mixture design(MD) methods. Different from the previous linear search of the cation ratios, it is found that by employing the MD methods, the ternary composition can be tuned simultaneously follow simplex lattice designs or simplex-centroid designs, which enable significantly reduced experiment/sampling size to unveil the composition-property relationship for mixed perovskite materials, and to boost the resultant device efficiency. We illustrated the composition-property relationship of the mixed perovskites in multi-dimension, and achieved an optimized power conversion efficiency of 20.99% in the corresponding device. Moreover, the method is demonstrated to be feasible to help adjust the bandgap through rational materials design, which can be further extended to other materials systems, not limited in polycrystalline perovskites films for photovoltaic applications only.

关键词： mixture design mixed cation composition perovskite solar cells bandgap structure

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Journal of Wuhan University of Technology(Materials Science) 2012年第4期27卷 789-793页

作者：李蕊裴建中 Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an University

Small stone asphalt mixture（SSAM） was designed by Bailey method and coarse aggregate voids-filling *** optimum asphalt content was determined by Marshal *** texture depth for SSAM with different voidage,and the BPN of SSAM and SMA before after wet track abrasion were *** experimental results indicate that the surface texture depth increases with the decreasing of asphalt aggregate *** SSAM with the optimal asphalt content has a good skid *** of asphalt mixture decreases with the increasing of wearing time,but the extent of reduction is *** reduction rate of BPN for SSAM is smaller than that of SMA,indicating that SSAM has a good skid resistance attenuation ***,the other properties of SSAM are also evaluated,showing that the splitting strength and modulus and SSAM are higher than those of SMA,and the other properties of SSAM,such as high-temperature performance and water stability can also satisfy the technical requirements.

关键词： small stone asphalt mixture mixture design anti-skidding performance attenuation of skid resistance

design Method and Performance for Large Stone Porous Asphalt mixtures

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Journal of Wuhan University of Technology(Materials Science) 2010年第5期25卷 871-876页

作者：赵永利黄晓明 School of Transportation Southeast University

design method for large stone porous asphalt mixtures （LSPM） was analyzed to avoid the early distresses of semi-rigid asphalt pavements. Based on stone-to-stone skeleton structure concept, processes of LSPM gradation design was given. The gradation composite design for LSPM shows that the LSPM nominal maximum size （ N MS） should be larger than 26.5 mm, and the NMS sieve passing percentage should be greater than 50%. Through experiments and calculations on the volume properties of the aggregate, the range of aggregate gradation curve of LSPM was given. In terms of asphalt binder＇s normalized test results, MAC-70 and SBS modified asphalt were selected as the asphalt binders. The applicability of large scale Marshall Method and gyratory compaction method to shape specimens was investigated. Based on the asphalt mixture performance evaluation, the optimum asphalt content range （3.1%-3.6%）, the bitumen film＇s thickness range （13-16 μm） and the air void range （13%-18 %） were recommended. Finally, LSPM was tested by the laboratory performance tests including rutting resistance test, fatigue test and water stability test. The theoretic and practical analysis shows that LSPM has a good performance on water permeability, rutting resistance and reflection crack resistance.

关键词： large stone porous asphalt mixtures (LSPM) mixture design performance aggregate gradation optimum asphalt content