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Rapid thermal evaporation for cadmium selenide thin-film solar cells

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Frontiers of Optoelectronics 2021年第4期14卷 482-490页

作者： Kanghua LI Xuetian LIN Boxiang SONG Rokas KONDROTAS Chong WANG Yue LU xuke yang Chao CHEN Jiang TANG Sargent Joint Research Center Wuhan National Laboratory for Optoelectronics(WNLO)School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China China-EU Institute for Clean and Renewable Energy(ICARE) Huazhong University of Science and TechnologyWuhan 430074China State Research Institute Center for Physical Sciences and TechnologyVilnius 02300Lithuania

Cadmium selenide(CdSe)belongs to the binary II-VI group semiconductor with a direct bandgap of~1.7 *** suitable bandgap,high stability,and low manufacturing cost make CdSe an extraordinary candidate as the top cell material in silicon-based tandem solar ***,only a few studies have focused on CdSe thin-film solar cells in the past *** 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 *** CdSe film demonstrated a 1.72 eV bandgap,narrow photoluminescence peak,and fast *** 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.

关键词： cadmium selenide(CdSe) rapid thermal evaporation(RTE) solar cells thin film

Abnormal amylopectin accumulation is detrimental to Toxoplasma virulence and cyst development

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Abnormal amylopectin accumulation is detrimental to Toxoplas...

All-vacuum fabrication of yellow perovskite light-emitting diodes

中国畜牧兽医学会兽医寄生虫学分会第一届青年科学家学术论坛

作者： Congcong Lyu xuke yang Jichao yang Lun Hou Yanqin Zhou Junlong Zhao Bang Shen State Key Laboratory of Agricultural Microbiology College of Veterinary MedicineHuazhong Agricultural University Key Laboratory of Preventive Medicine in Hubei Province Huazhong Agricultural University

Toxoplasma gondii is a ubiquitous pathogen infecting humans and numerous animals,leading to huge socio-economic *** unique aspect of this parasite that contributes to its transmission and pathogenesis is the ability to interconvert between fast replicating tachyzoites and nearly dormant *** bradyzoites accumulate high levels of amylopectin,which is barely seen in *** its physiological significance is not fully *** we identified a starch synthase (SS) that is key for amylopectin synthesis in *** genetic ablation of this enzyme only modestly affected tachyzoite replication and cyst morphology On the other hand,deletion of SS in the△cdpk2 mutant completely abolished its massive amylopectin accumulation and restored the cyst formation and virulence *** these results suggest that amylopectin synthesis is not required for chronic infection establishment,but its abnormal accumulation is deleterious to parasite virulence and cyst development.

关键词： Toxoplasma chronic infection cyst amylopectin starch synthase

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Science Bulletin 2022年第2期67卷 178-185,M0004页

作者： Jinghui Li Longbo yang Qingxun Guo Peipei Du Liang Wang Xue Zhao Nian Liu xuke yang Jiajun Luo Jiang Tang Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Yellow light-emitting diodes(LEDs) are widely utilized in high-quality lighting, light communication,indicator lamps, etc. Owing to their outstanding material properties and device performance, the metal halide perovskites have demonstrated a significant potential for LED applications. However, the performance of the yellow perovskite LEDs(PeLEDs) is inferior to that of their green and red counterparts, with the maximum external quantum efficiency(EQE) limited to ~3.1%. Further, a majority of the yellow PeLEDs are fabricated using the spin-coating methods. The current study reports the development of the yellow CsPbBr_(2)I PeLEDs based on an all-vacuum deposition approach, which has been widely employed in the commercial organic LEDs(OLEDs). By controlling the co-evaporation rate of CsI and PbBr;, the growth kinetics of the perovskite layer are regulated to achieve a small grain size of~31.8 nm. Consequently, an improved radiative recombination rate(8.04 × 10^(-9)cm^(3)/s) is obtained owing to the spatial confinement effect. The PeLEDs based on the optimal perovskite film demonstrate the yellow electroluminescence(574 nm) with a maximum EQE of ~3.7% and luminance of~16,200 cd/m^(2), thus, representing one of the most efficient and bright yellow PeLEDs. Overall, this study provides a useful guideline for realizing the efficient PeLEDs based on the thermal evaporation strategy and highlights the potential of PeLED as an efficient and bright yellow light source.

关键词： All-vacuum fabrication Inorganic CsPbBr2I Yellow light-emitting diodes

The pyruvate dehydrogenase complex is important for fatty acid synthesis in Toxoplasma gondii

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The pyruvate dehydrogenase complex is important for fatty ac...

中国畜牧兽医学会兽医寄生虫学分会第一届青年科学家学术论坛

作者： Xiaohan Liang xuke yang Ningbo Xia Yaqiong Li Junlong Zhao Nishith Gupta Bang Shen State Key Laboratory of Agricultural Microbiology College of Veterinary MedicineHuazhong Agricultural University Institute of Biology Faculty of Life SciencesHumboldt University

Pyruvate dehydrogenase(PDH) is a multi-subunit enzyme conserved in all eukaryotes catalyzing the conversion of pyruvate into *** most other eukaryotes that have PDH localized to the mitochondria,apicomplexan parasites harbor a single PDH but it is localized in the apicoplast,where it is thought to generate acetyl-CoA to fuel the type 2 fatty acids synthesis(FAS2) *** Toxoplasma,a common intracellular pathogen of humans and animals,FAS2 is believed to be crucial for parasite growth but the physiological importance of PDH has not been *** this study,we found that Toxoplasma could tolerate the genetic deletion of three PDH subunits(Ela,E2 or E3).Such mutants were able to survive in tissue culture,although with impaired growth,which correlated with a loss of *** labeling on the △pdh-e1 a mutant revealed reduced incorporation of glucose derived carbon into fatty acids with medium-chain lengths(C14:0,C16:0),suggesting a compromised FAS2 ***,all mutants lacking PDH showed a normal virulence in mice,indicating a dispensable role in vivo Together our results demonstrate an unexpectedly nonessential role of PDH in Toxoplasma,while questioning the physiological significance and therapeutic value of FAS2 in this parasite.

关键词： pyruvate dehydrogenase type 2 fatty acid synthesis apicoplast

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京津冀天使投资空间溢出动态演化

地域研究与开发 2018年第5期37卷 13-18页

作者：杨绪可邬艳杰熊文北京工商大学经济学院北京100048

天使投资的发展扩散作为一种空间溢出,有其独特的演化规律和空间特质。利用天使投资空间溢出模型,将其从静态拓展到动态,用以分析京津冀天使投资的动态演化与相互影响的作用机理。结果表明:京津冀天使投资的空间演化过程大致经历了初始... 详细信息

天使投资的发展扩散作为一种空间溢出,有其独特的演化规律和空间特质。利用天使投资空间溢出模型,将其从静态拓展到动态,用以分析京津冀天使投资的动态演化与相互影响的作用机理。结果表明:京津冀天使投资的空间演化过程大致经历了初始、雏形、形成和稳定发展4个阶段,最终形成了以北京为中心,北京、天津、河北为核心区域,山西、内蒙古、山东、河南为外围区域的溢出圈层。随着空间距离的增大,京津冀圈内溢出水平存在明显的递减趋势,且在圈层内部结构呈现出中心、核心区域、外围区域层层递进,良性互动的特点。在研究京津冀溢出圈层时发现,区域间的经济交流能促进溢出作用的良性互动。同时,提高当地经济的发展水平、增强科技创新能力才能从根本上提高接受溢入的能力。

关键词：天使投资溢出水平京津冀

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分阶段风险投资对技术创新的影响研究

科技与经济 2018年第3期31卷 60-64页

作者：杨绪可张亚华熊文北京工商大学经济学院北京100048

从全国各省市风险投资阶段性特征以及研发投入的空间演化出发,构建分阶段风险投资影响技术创新的面板数据模型,通过实证分析发现:种子期、起步期、扩张期3个阶段风险投资对技术创新的影响具有明显的区域差异,并且起步期和扩张期风险投... 详细信息

从全国各省市风险投资阶段性特征以及研发投入的空间演化出发,构建分阶段风险投资影响技术创新的面板数据模型,通过实证分析发现:种子期、起步期、扩张期3个阶段风险投资对技术创新的影响具有明显的区域差异,并且起步期和扩张期风险投资对技术创新的促进作用强于种子期;过渡期阶段风险投资和其他3个阶段相比较具有明显的不同,对技术创新的影响主要受各地区的自发性作用。

关键词：风险投资分阶段技术创新面板数据模型

Velocity transformation for compressible wall-bounded turbulence——An approach through the mixing length hypothesis

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 108-125页

作者： xuke Zhu Yubin Song Xiaoshuo yang Zhenhua Xia State Key Laboratory of Fluid Power and Mechatronic Systems and Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China

In an endeavor to establish a connection between the mean velocity profile in compressible wall-bounded turbulence and its incompressible analogue,a refined version of the Trettel and Larsson's(TL)transformation is systematically derived and rigorously assessed across diverse flow *** the recently proposed intrinsic compressibility effects and modeling the multi-layer structure of mixing lengths,the proposed transformation demonstrates exceptional performance in collapsing 57canonical flow cases,including cooled channel and pipe flows,channel flows with pseudo heat sources,as well as adiabatic and diabatic boundary layer ***,the transformation seamlessly extends to low Reynolds number cooled channel and pipe flows,achieving a level of accuracy unparalleled by other transformations in the current state-of-the-art.

关键词： mixing length hypothesis compressible wall-bounded turbulence velocity transformation law of the wall

Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

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Chinese Journal of Chemical Engineering 2021年第4期34卷 324-334页

作者： xuke Ruan Xiao-Sen Li Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China CAS Key Laboratory of Gas Hydrate Guangzhou 510640China

The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate *** this study,the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous *** experiments of methane hydrate depressurizationinduced dissociation were performed in a 1D high pressure cell filled with glass beads,an improved and valid 1D corescale numerical model was developed to simulate gas *** conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media,which formed the functional form of the hydrate dissociation surface area with porosity,hydrate saturation and the average radius of sand sediment *** the establishment of numerical model for depressurizationinduced hydrate dissociation in porous media,the cumulative gas productions were modeling and compared with the experimental data at the different hydrate *** results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area,and the graincoating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation,whereas at higher hydrate saturation,the hydrate dissociation simulation from the porefilling surface area model is more ***,the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

关键词： Surface area Methane hydrate Hydrate dissociation Hydrate morphology Depressurization

Numerical studies of hydrate dissociation and gas production behavior in porous media during depressurization process

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Journal of Natural Gas Chemistry 2012年第4期21卷 381-392页

作者： xuke Ruan Mingjun yang Yongchen Song Haifeng Liang yanghui Li Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116023LiaoningChina College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

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 tl/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 Swr,e. For the case of Sw,e〈,Swr,e, or Sw,e〉Swr,e, there are different control mechanisms domin

关键词： gas hydrate numerical simulation permeability dissociation gas production depressurization