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| 1 | Numerical studies of hydrate dissociation and gas production behavior in porous media during depressurization process显示文摘In this study,a numerical model is developed to investigate the hydrate dissociation and gas production in porous media by depressurization.A series of simulation runs are conducted to study the impacts of permeability characteristics,including permeability reduction exponent,absolute permeability,hydrate accumulation habits and hydrate saturation,sand average grain size and irreducible water saturation.The effects of the distribution of hydrate in porous media are examined by adapting conceptual models of hydrate accumulation habits into simulations to govern the evolution of permeability with hydrate decomposition,which is also compared with the conventional reservoir permeability model,i.e.Corey model.The simulations show that the hydrate dissociation rate increases with the decrease of permeability reduction exponent,hydrate saturation and the sand average grain size.Compared with the conceptual models of hydrate accumulation habits,our simulations indicate that Corey model overpredicts the gas production and the performance of hydrate coating models is superior to that of hydrate filling models in gas production,which behavior does follow by the order of capillary coating>pore coating>pore filling>capillary filling.From the analysis of t1/2,some interesting results are suggested as follows:(1) there is a 'switch' value(the'switch'absolute permeability) for laboratory-scale hydrate dissociation in porous media,the absolute permeability has almost no influence on the gas production behavior when the permeability exceeds the 'switch' value.In this study,the 'switch' value of absolute permeability can be estimated to be between 10 and 50 md.(2) An optimum value of initial effective water saturation Sw,e exists where hydrate dissociation rate reaches the maximum and the optimum value largely coincides with the value of irreducible water saturation S wr,e.For the case of Sw,Swr,e,there are different control mechanisms dominating the process of hydrate dissociation and gas production. | Xuke Ruan Mingjun Yang Yongchen Song Haifeng Liang Yanghui Li | 2012 | Journal of Natural Gas Chemistry2012，21，4： | 3 |
| 2 | Genome-wide identification and expression analysis of DNA demethylase family in cotton显示文摘Background:DNA methylation is an important epigenetic factor that maintains and regulates gene expression.The mode and level of DNA methylation depend on the roles of DNA methyltransferase and demethylase,while DNA demethylase plays a key role in the process of DNA demethylation.The results showed that the plant’s DNA demethylase all contained conserved DNA glycosidase domain.This study identified the cotton DNA demethylase gene family and analyzed it using bioinformatics methods to lay the foundation for further study of cotton demethylase gene function.Results:This study used genomic information from diploid Gossypium raimondii JGI(D),Gossypium arboreum L.CRI(A),Gossypium hirsutum L.JGI(AD1) and Gossypium barbadebse L NAU(AD2) to Arabidopsis thaliana.Using DNA demethylase genes sequence of Arabidopsis as reference,25 DNA demethylase genes were identified in cotton by BLAST analysis.There are 4 genes in the genome D,5 genes in the genome A,10 genes in the genome AD1,and 6 genes in the genome AD2.The gene structure and evolution were analyzed by bioinformatics,and the expression patterns of DNA demethylase gene family in Gossypium hirsutum L were analyzed.From the phylogenetic tree analysis,the DNA demethylase gene family of cotton can be divided into four subfamilies:REPRESSOR of SILENCING 1(ROS1),DEMETER(DME),DEMETER-LIKE 2(DML2),and DEMETER-LIKE3(DML3).The sequence similarity of DNA demethylase genes in the same species was higher,and the genetic relationship was also relatively close.Analysis of the gene structure revealed that the DNA demethylase gene family members of the four subfamilies varied greatly.Among them,the number of introns of ROS1 and DME subfamily was larger,and the gene structure was more complex.For the analysis of the conserved domain,it was known that the DNA demethylase family gene member has an endonuclease Ⅲ(END03 c) domain.Conclusion:The genes of the DNA demethylase family are distributed differently in different cotton species,and the gene structure is very different.High expression of ROS1 genes in cotton were under abiotic stress.The expression levels of ROS1 genes were higher during the formation of cotton ovule.The transcription levels of ROS1 family genes were higher during cotton fiber development. | YANG Xiaomin LU Xuke CHEN Xiugui WANG Delong WANG Junjuan WANG Shuai GUO Lixue CHEN Chao WANG Xiaoge WANG Xinlei YE Wuwei | 2019 | Journal of Cotton Research2019，2，3： | 3 |
| 3 | Modification of cell wall polysaccharide during ripening of Chinese bayberry fruit显示文摘 | Xuke Sun Qin Yang Weidong Guo Linxiao Dai Wenrong Chen | 2013 | Scientia Horticulturae2013，，： | 1 |
| 4 | Filter-free self-power CdSe/Sb_(2)(S_(1-x),Se_(x))_(3)nearinfrared narrowband detection and imaging显示文摘Accurate and clear bioimaging is crucial in the field of medical diagnosis.High-quality bioimaging requires to avoid the effects of ambient light as well as the absorption of biological tissues.Nearinfrared(NIR)narrowband detectors located at wavelength from 650 to 900 nm can meet these requirements;thus,they are the potential solution.In this work,we construct a filter-free and self-power NIR narrowband photodetector based on the structure of n-CdSe/p-Sb_(2)(S_(1-x),Se_(x))_(3)heterojunction,and achieve a narrow spectral response at 735 nm with a full width at half-maximum of 35.3 nm in the detector.Further,the imaging characteristics of the NIR narrowband detector are explored,verifying the ability to narrowband detection and imaging.This filter-free and self-power NIR narrowband detector shows considerable promise in real-life applications. | Kanghua Li Yue Lu Xuke Yang Liuchong Fu Jungang He Xuetian Lin Jiajia Zheng Shuaicheng Lu Chao Chen Jiang Tang | 2021 | InfoMat2021，3，10： | 0 |
| 5 | Rapid thermal evaporation for cadmium selenide thin-film solar cells显示文摘Cadmium selenide(CdSe)belongs to the binary II-VI group semiconductor with a direct bandgap of~1.7 eV.The suitable bandgap,high stability,and low manufacturing cost make CdSe an extraordinary candidate as the top cell material in silicon-based tandem solar cells.However,only a few studies have focused on CdSe thin-film solar cells in the past decades.With the advantages of a high deposition rate(~2µm/min)and high uniformity,rapid thermal evaporation(RTE)was used to maximize the use efficiency of CdSe source material.A stable and pure hexagonal phase CdSe thin film with a large grain size was achieved.The CdSe film demonstrated a 1.72 eV bandgap,narrow photoluminescence peak,and fast photoresponse.With the optimal device structure and film thickness,we finally achieved a preliminary efficiency of 1.88%for CdSe thin-film solar cells,suggesting the applicability of CdSe thin-film solar cells. | Kanghua LI Xuetian LIN Boxiang SONG Rokas KONDROTAS Chong WANG Yue LU Xuke YANG Chao CHEN Jiang TANG | 2021 | Frontiers of Optoelectronics2021，14，4： | 0 |
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