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Device simulation of quasi-two-dimensional perovskite/silicon tandem solar cells towards 30%-efficiency

Chinese Physics B 2022年第10期31卷 592-598页

作者： Xiao-Ping Xie Qian-Yu Bai Gang Liu Peng dong Da-Wei Liu Yu-Feng Ni Chen-Bo Liu He Xi Wei-dong Zhu Da-zheng Chen Chun-Fu Zhang Qinghai Huanghe Hydropower Development CO. LTD.Xining 810008China State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Xidian UniversityXi’an 710071China

Perovskite/silicon(Si) tandem solar cells have been recognized as the next-generation photovoltaic technology with efficiency over 30% and low cost. However, the intrinsic instability of traditional three-dimensional(3D) hybrid perovskite seriously hinders the lifetimes of tandem devices. In this work, the quasi-two-dimensional(2D)(BA)_(2)(MA)_(n-1)Pbn I_(3n+1)(n = 1, 2, 3, 4, 5)(where MA denotes methylammonium and BA represents butylammonium), with senior stability and wider bandgap, are first used as an absorber of semitransparent top perovskite solar cells(PSCs) to construct a fourterminal(4T) tandem devices with a bottom Si-heterojunction cell. The device model is established by Silvaco Atlas based on experimental parameters. Simulation results show that in the optimized tandem device, the top cell(n = 4) obtains a power conversion efficiency(PCE) of 17.39% and the Si bottom cell shows a PCE of 11.44%, thus an overall PCE of 28.83%. Furthermore, by introducing a 90-nm lithium fluoride(LiF) anti-reflection layer to reduce the surface reflection loss, the current density(J_(sc)) of the top cell is enhanced from 15.56 m A/cm^(2) to 17.09 m A/cm^(2), the corresponding PCE reaches 19.05%, and the tandem PCE increases to 30.58%. Simultaneously, in the cases of n = 3, 4, and 5, all the tandem PCEs exceed the limiting theoretical efficiency of Si cells. Therefore, the 4T quasi-2D perovskite/Si devices provide a more cost-effective tandem strategy and long-term stability solutions.

关键词： two-dimensional device simulation antireflection layers tandem solar cells

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Entropy of Vaidya-deSitter Spacetime

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Chinese Physics Letters 2001年第3期18卷 463-465页

作者： LI Xiang ZHAO zheng Department of Physics Beijing Normal UniversityBeijing 100875

As a statistical model of black hole entropy,the brick-wall method based on the thermal equilibrium in a large scale cannot be applied to the cases out of equilibrium,such as the non-static hole or the case with two ***,the leading term of hole entropy called the Bekenstein-Hawking entropy comes from the contribution of the field near the *** to this idea,the entropy of Vaidya-deSitter spacetime is calculated,A difference from the static case is that the result proportional to the area of horizon relies on a time-dependent *** condition of local equilibrium near the horizon is used as a working postulate.

关键词： horizon entropy equilibrium

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Bumblebees with the socially transmitted microbiome:A novel model organism for gut microbiota research

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Insect Science 2022年第4期29卷 958-976页

作者： Zi-Jing Zhang Hao zheng College of Food Science and Nutritional Engineering China Agricultural UniversityBeijingChina

Eusocial bumble and honey bees are important pollinators for global ecology and the agricultural *** both the bumble and honey bees possess similar and host-restricted gut microbiota,they differ in aspects of morphology,autonomy,physiology,behavior,and life *** social bee gut bacteria exhibit host specificity that is likely a result of long-term *** unique life cycle of bumblebees is key for the acquisition and development of their gut microbiota,and affects the strain-level diversity of the core bacterial *** on bumblebee gut bacteria show that they retain less functional capacity for carbohydrate metabolism compared with that of the *** discuss the potential roles of the bumblebee gut microbiota against pathogenic threats and the application of host-specific probiotics for *** the advantages of the bumblebee microbiome,including the simple structure and host specificity,and the ease of manipulating bumblebee colonies,we propose that bumblebees may provide a valuable system for understanding the general principles of host-microbe interactions,gut-brain axis,and vertical transmission.

关键词： bumblebee gut microbiota host-microbe interaction model organism

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Approximation Algorithms on k-Correlation Clustering

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Journal of the Operations Research Society of China 2023年第4期11卷 911-924页

作者： Zhong-zheng Tang Zhuo Diao School of Science Beijing University of Posts and TelecommunicationsBeijing100876China School of Statistics and Mathematics Central University of Finance and EconomicsBeijing100081China

In this paper,we consider the k-correlation clustering *** an edge-weighted graph G(V,E)where the edges are labeled either“+”(similar)or“−”(different)with nonnegative weights,we want to partition the nodes into at most k-clusters to maximize agreements—the total weights of“+”edges within clusters and“−”edges between *** problem is *** design an approximation algorithm with the approximation ratio{a,(2-k)a+k-1/k},where a is the weighted proportion of“+”edges in all *** a varies from 0 to 1,the approximation ratio varies from k-1/k to 1 and the minimum value is 1/2.

关键词： k-Correlation clusters Approximation algorithms Choosing the better of two solutions

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Relationship between baseline monocyte to high-density lipoprotein cholesterol ratio and acute heart failure in postmenopausal women with acute coronary syndromes

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South China Journal of Cardiology 2021年第3期22卷 145-153页

作者： WANG Ying zheng Hai-sheng HUANG Zhen-chun zheng Xiao-dong Department of Cardiology Shantou Central HospitalShantou 515031GuangdongChina

Monocyte to high-density lipoprotein cholesterol ratio(MHR)becomes a novel cardiovascular prognostic *** retrospective study was performed to investigate the relationship between MHR and acute heart failure(AHF)in postmenopausal women with acute coronary syndromes(ACS).Methods A cohort of 127 postmenopausal women diagnosed with ACS were *** underwent coronary angiography in Shantou Central Hospital(Shantou,China)from December 2014 and July *** patients were assigned to two groups based on the admission MHR:low MHR group(MHR≤0.3677,n=51)and high MHR group(MHR>0.3677,n=76).The relationship between MHR and AHF was assessed by logistic regression *** Left ventricular ejection fraction of the low MHR group(64.2%±8.8%)was higher than that of the high MHR group(57.6%±12.9%)(P=0.002).Fractional shortening of the low MHR group(35.4%±6.4%)was higher than that of the high MHR group(30.6%±8.9%)(P=0.001).Hospitalization days of high MHR group(11.4±6.6 days)was longer than that of low MHR group(8.4±3.5 days)(P=0.006).Incidence of AHF(21%)in the high MHR group was higher than that in the low MHR group(4%)(P=0.008).MHR(OR:25.701,95%CI:3.099-213.143,P=0.003)could be an independent predictor for AHF in postmenopausal women with acute coronary *** The incidence of AHF in high baseline MHR group was higher than that in low baseline MHR *** study demonstrated that high MHR level was a risk factor for AHF in postmenopausal women with ACS.

关键词： monocyte to high-density lipoprotein-cholesterol ratio acute heart failure postmenopausal women acute coronary syndromes

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A new stage of the Asian laser-induced breakdown spectroscopy community

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Plasma Science and Technology 2022年第8期24卷 1-4页

作者： Weilun GU Lei ZHANG Meirong dong Cong LI Ye TIAN Zongyu HOU Zhe WANG Ronger zheng State Key Laboratory of Power Systems International Joint Laboratory on Low Carbon Clean Energy InnovationDepartment of Energy and Power EngineeringTsinghua UniversityBeijing 100084People’s Republic of China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006People’s Republic of China School of Electric Power South China University of TechnologyGuangzhou 510640People’s Republic of China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024People’s Republic of China College of Physics and Optoelectronic Engineering Ocean University of ChinaQingdao 266100People’s Republic of China

Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopy technique gaining much attention since it was created in 1962[1].In 2021,the 4th Asian Symposium on LIBS (ASLIBS) and the ten-year anniversary of Chinese Symposium on LIBS (CSLIBS) were jointly held in Qingdao,symbolizing the development of the Asian and Chinese LIBS communities into a new *** the initiation of CSLIBS in Qingdao (2011) and ASLIBS in Wuhan[2](2015).

关键词： breakdown laser spectroscopy

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Studies on the Quantitative Structure-activity Relationship of Substituted Biphenyls by Density Function Theory (DFT)

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Chinese Journal of Structural Chemistry 2007年第2期26卷 229-233页

作者： HAN Xiang-Yun zheng Qing Department of Chemical Engineering YanchengInstitute of Technology Jiangsu 224003 China

Geometrical configurations of 16 substituted biphenyls were computed at the B3LYP/6-311G^＊＊ level with Gaussian 98 program. Based on linear solvation energy theory, lgKow as well as the structural and thermodynamic parameters obtained at this level was taken as theoretical descriptors, and corresponding equation predicting the toxicity of Daphnia magna （-lgEC5o） was thus obtained, in which three parameters were contained, i.e., n-octanol/water partition coefficients （lgKow）, dipole moment of the molecules（ μ） and entropy （S°）. For this equation, R^2 = 0.9582, q^2 = 0.8921 and SD = 0.102. The absolute t-scores of three variables are larger than the standard one in the confidence range of 95%, which confirms the creditability and stability of this model.

关键词： substituted biphenyl linear solvation energy theory,DFT method Daphnia magna toxicity

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基于证据推理规则的信息融合故障诊断方法

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控制理论与应用 2015年第9期32卷 1170-1182页

作者：徐晓滨郑进徐冬玲杨剑波杭州电子科技大学自动化学院系统科学与控制工程研究所浙江杭州310018 曼彻斯特大学决策与认知科学研究中心

本文针对不确定性故障特征信息的融合决策问题,给出基于证据推理(evidence reasoning,ER)规则的故障诊断方法.首先基于故障特征样本似然函数归一化的方法求取各传感器(信息源)提供的诊断证据;从传感器误差以及故障特征对各故障类型辨别... 详细信息

本文针对不确定性故障特征信息的融合决策问题,给出基于证据推理(evidence reasoning,ER)规则的故障诊断方法.首先基于故障特征样本似然函数归一化的方法求取各传感器(信息源)提供的诊断证据;从传感器误差以及故障特征对各故障类型辨别能力的差异出发,给出获取诊断证据可靠性因子的方法;给出双目标优化模型训练得到诊断证据的重要性权重,最后利用ER规则融合经可靠性因子和重要性权重修正后的诊断证据,利用融合结果进行故障决策.该方法继承了Dempster-Shafer证据理论处理不确定性信息融合问题的优点,同时克服了它在实际应用中无法区分证据可靠性和重要性的不足,使得所获诊断证据更为客观、可信.最后,通过在多功能电机转子试验台上的故障诊断实验,验证了所提方法的有效性.

关键词：故障诊断信息融合证据推理规则证据可靠性证据重要性

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The Hamilton-Connectivity with the Degree Sum of Non-adjacent Subgraphs of Claw-free Graphs

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Acta Mathematicae Applicatae Sinica 2019年第3期35卷 580-590页

作者： Wei zheng Li-gong WANG Department of Applied Mat hem a tics School of ScienceNorthwes tern Polytechnical Univers计yXi5an 710072China Xi'an-Budapest Joint Research Center for Combinatorics Northwestern Polytechnical UniversityXi'an 710129China

The degree d(H)of a subgraph H of a graph G is|u∈∪V(H)N(u)-V(H)|,where N(u)denotes the neighbor set of the vertex u of *** this paper,we prove the following result on the condition of the degrees of *** G be a 2-connected claw-free graph of order n with minimum degreeδ(G)≥*** for any three non-adjacent subgraphs H1,H2,H3 that are isomorphic to K1,K1,K2,respectively,there is d(H1)+d(H2)+d(H3)≥n+3,then for each pair of vertices u,v∈G that is not a cut set,there exists a Hamilton path between u and v.

关键词： Claw-free graph non-adjacent subgraph degree of subgraph Hamilton path

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Understanding endometriosis from an immunomicroenvironmental perspective

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Chinese Medical Journal 2023年第16期136卷 1897-1909页

作者： Dian Fan xu Wang Zhixian Shi Yuting Jiang Bohao zheng Lian xu Shengtao Zhou Department of Obstetrics and Gynecology Key Laboratory of Birth Defects and Related Diseases of Women and Children of MOE and State Key Laboratory of BiotherapyWest China Second HospitalSichuan University and Collaborative Innovation CenterChengduSichuan 610041China Wuxi School of Medicine Jiangnan UniversityWuxiJiangsu 214122China Department of Pathology West China Second HospitalSichuan UniversityChengduSichuan 610041China 不详

Endometriosis,a heterogeneous,inflammatory,and estrogen-dependent gynecological disease defined by the presence and growth of endometrial tissues outside the lining of the uterus,affects approximately 5-10%of reproductive-age women,causing chronic pelvic pain and reduced *** the etiology of endometriosis is still elusive,emerging evidence supports the idea that immune dysregulation can promote the survival and growth of retrograde endometrial *** macrophages and natural killer(NK)cells exhibit deficient cytotoxicity in the endometriotic microenvironment,leading to inefficient eradication of refluxed endometrial *** addition,the imbalance of T-cell subtypes results in aberrant cytokine production and chronic inflammation,which contribute to endometriosis *** it remains uncertain whether immune dysregulation represents an initial cause or merely a secondary enhancer of endometriosis,therapies targeting altered immune pathways exhibit satisfactory effects in preventing disease onset and ***,we summarize the phenotypic and functional alterations of immune cells in the endometriotic microenvironment,focusing on their interactions with microbiota and endocrine and nervous systems,and how these interactions contribute to the etiology and symptomology of endometriosis.

关键词： Endometriosis Immune cells Microenvironment Inflammation

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