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Time-resolved photoluminescence:a precision tool for shallow trap density determination in perovskite films

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Chinese Optics Letters 2024年第8期22卷 124-130页

作者： Wei Chen Yifeng shi Pengxiang wang guodong Zhang Hu wang Yifan Zheng Yuchuan Shao Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China School of Material Science and Technology ShanghaiTech UniversityShanghai 201210China

Determining the trap density in the absorbing layer thin film of perovskite solar cells is a critically important task,as it directly influences the efficiency of the ***,we proposed time-resolved photoluminescence(TRPL)as a nondestructive method to assess trap density.A model was constructed to investigate carrier recombination and transition in perovskite *** model was utilized for numerical calculations and successfully fitted TRPL signals of perovskite ***,a genetic algorithm was employed to optimize the ***,statistical methods were applied to obtain the parameters associated with the trap states of the *** approach facilitates the successful determination of trap densities for different samples with clear differentiation.

关键词： perovskite solar cell time-resolved photoluminescence genetic algorithm trap density methylammonium lead triiodide

Neuronal tolerance to hypoxia-ischemia through recombinant adeno-associated viral vectors expressing neuronal and inducible nitric oxide synthase An in vivo study

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Neural Regeneration Research 2008年第2期3卷 157-161页

作者： Chunmei Chen Weizhong Yang Chunhua wang Songsheng shi jianping Chen Yong Huang Dongsheng Cai Department of Neurosurgery Union Hospital Fujian Medical University Fujian Institute of Neurosurgery Fuzhou 350001 Fujian Province China

BACKGROUND： Studies have confirmed that neuronal nitric oxide synthase （nNOS） mediates neurotoxic effects during the early stages of hypoxia-ischemia, while inducible nitric oxide synthase （iNOS） mediates delayed neurotoxicity during advanced stages of hypoxia-ischemia. OBJECTIVE： This study was designed to observe neuronal apoptosis and the expressions of nNOS, iNOS, p38 mitogen-activated protein kinase （MAPK）, and caspase-3 mRNA following transfection of recombinant adeno-associated viral vectors separately expressing nNOS and iNOS antisense （rAAV-AsnNOS and rAVV-AsiNOS, respectively） into rat brains subjected to cerebral ischemia; to analyze mechanisms underlying elevated neuronal tolerance to hypoxia-ischemia. DESIGN： A randomized controlled in vivo experiment. SETTING： Fujian Institute of Neurosurgery ＆ Department of Neurosurgery, Union Hospital, Fujian Medical University. MATERIALS： Eighty healthy adult male Sprague Dawley rats of clean grade were provided by the Zhejiang Laboratory Animal Center, China. The protocol was performed in accordance with ethical guidelines for the use and care of animals. The following vectors, rAAV-AsnNOS, rAAV-AsiNOS, and rAAV expressing the β -galactosidase gene （rAAV-LacZ）, were successfully constructed by Fujian Institute of Neurosurgery. Rabbit anti-mouse nitrotyrosine （NT） monoclonal antibody （Zhongshan Jinqiao Biotechnology Co., Ltd., Beijing, China） and reverse transcription-polymerase chain reaction （RT-PCR） kit （two-step method）（Promega Company, USA） were used in this study. METHODS： This study was performed at the Fujian Institute of Neurosurgery in December 2003. Sixty rats were randomly divided into 3 groups, with 20 rats in each group： rAAV-AsnNOS group, rAAV-AsiNOS group, and rAAV-LacZ group. The remaining 20 rats served as controls. Pre-treated viral vectors （rAAV-AsnNOS, rAAV-AsiNOS, and rAAV-LacZ, respectively; each 50μL, virus titer of 2×10^9 viral particles/mL） were transfected into the cerebral cortex o

关键词： cerebral ischemia NOS, apoptosis rAAV

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中石油钻井工程技术现状、挑战及发展趋势

天然气工业 2013年第10期33卷 1-10页

作者：石林汪海阁纪国栋中国石油集团钻井工程技术研究院

中国石油天然气集团公司(以下简称中石油)近年来自主研制了万米钻机及配套装备、近钻头地质导向、欠平衡/气体钻井/控压钻井、连续管作业机、21MPa/35MPa带压作业机等核心装备,发展完善了以水平井、欠平衡钻井、钻井提速、储层改造、带... 详细信息

中国石油天然气集团公司(以下简称中石油)近年来自主研制了万米钻机及配套装备、近钻头地质导向、欠平衡/气体钻井/控压钻井、连续管作业机、21MPa/35MPa带压作业机等核心装备,发展完善了以水平井、欠平衡钻井、钻井提速、储层改造、带压作业为核心的配套技术,有力地支撑了水平井、欠平衡钻井、钻井提速、水平井分段压裂等重点工程的实施。但与国外同行相比,在自动化钻机、海洋钻完井装备、旋转导向系统、抗高温随钻测量仪器、抗高温螺杆、高效钻头、高温高密度油基钻井液、高压气井带压作业装备、低成本高效压裂液、无限制选择性压裂工具、完井技术等方面差距明显。研究结果认为:我国深层、海洋、非常规油气藏领域钻完井面临高温高压、高研磨性地层钻速低、钻井周期长、旋转导向等技术储备不足的挑战,建议在高效起下钻机、高效破岩钻头和辅助工具、旋转导向系统、井筒完整性、井下宽带信息传输技术、海洋钻井成套装备和技术、工厂化钻完井与体积压裂一体化技术等方面开展技术攻关。

关键词：中国石油天然气集团公司钻井工程技术现状深层海洋非常规油气藏挑战进展技术攻关

An Improved DV-Hop Scheme Based on Similar Path Searching and Quasi-Newton Iterative Algorithm

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An Improved DV-Hop Scheme Based on Similar Path Searching an...

Fire needling for herpes zoster: A systematic review and meta-analysis of randomized clinical trials

第30届中国控制与决策会议

作者： shi Qinqin wang Dongyu Xu Qiang Zhang jianping School of Computer Science & Information Engineering Shanghai Institute of Technology

The node localization process of the traditional DV-Hop（Distance Vector-Hop） scheme is sensitive to the heterogeneity of network topology, and the robustness of the scheme is poor while the network topology is diversiform due to random node deployment. Aiming at such a problem, improved strategies are provided. In the distance estimation step, a strategy of searching the most similar anchor-anchor path to anchor-node path is proposed;in the position calculation step, a modified Quasi-Newton iterative algorithm is added after the initial position of an unknown node is derived using Lateration algorithm. Simulation shows that compared with the original method and an existed representative improved scheme, our improvement can obtain higher distance estimation accuracy at first, and then, it can improve the robustness of the localization algorithm to range error. Thereby, the improvement can effectively improve the average localization accuracy of the unknown nodes in the network.

关键词： DV-Hop Node Localization Path Matching Lateration Quasi-Newton

来源： cnki会议评论

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Journal of Traditional Chinese Medical Sciences 2019年第1期6卷 3-12页

作者： Nanqi Zhao Lily Lai Xiao wang Liyan Jia Xun Li Baoyong Lai Ruixue Hu Na shi Yiwen Qin Mei Han Zhaolan Liu jianping Liu Centre for Evidence-Based Chinese Medicine Beijing University of Chinese MedicineBeijing 100029China Primary Care and Population Sciences University of SouthamptonSouthamptonUnited Kingdom School of Traditional Chinese Medicine Beijing University of Chinese MedicineBeijing 100029China

Objective:To evaluate the effectiveness and safety of fire needling for herpes zoster from randomized clinical trials (RCTs).Methods:We searched Cochrane Central Register of Controlled Trials,Pubmed,Sino-Med,CNKI,VIP,WanFang databases,and conference proceedings to November,*** were eligible if they tested fire needling for treating herpes zoster more than 3 *** authors screened all references,assessed the risk of bias,extracted data,independently,and analyzed data using Trial Sequential Analysis (TSA).Treatment effects were presented as risk ratio (RR)for binary data and standardized mean difference (SMD) for continuous data with 95% confidence interval (CI).Results:We included 27 RCTs with a total of 1933 *** one RCT had low risk of bias,and the others were of high or moderate risk of *** total effectiveness rate (proportion of total number of people who were cured or significant symptom improved),there was no significant difference between Western medicine (acyclovir,valacyclovir,adenosine cobalamin) and fire needling (risk ratio 1.05,95% CI 0.98 to 1.12;n =5).For pain relief (VAS scale):fire needling used alone showed lower scores than Western medicine (SMD-1.37,95% CI-1.77 to-0.97;n =2) or external medicine (diclofenac) (SMD-2.23,95% CI-2.81 to-1.64;n =1).Combination of fire needling and Western medicine was better than Western medicine alone in relieving pain (VAS scale) (SMD-2.19,95% CI-3.40 to-0.97,I2 =94%;n =4).Patients receiving fire needling had lower incidence of neuralgia than those receiving Western medicine (3.3% vs 26.7%,RR 0.09,95% Cl 0.01 to 0.82;n =1) at follow up for 30 *** serious adverse events such as infection were ***:Fire needling appears to offer relief for alleviating pain in herpes *** the sample size of included trials was small and the quality of studies was generally low,rigorous clinical trials with robust reporting and appropriate outcome measures are still needed.

关键词： Fire needling Acupuncture Herpes zoster Postherpetic neuralgia Trial sequential analysis

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自适应Walsh函数有限体积方法

航空学报 2023年第8期44卷 54-66页

作者：任炯王刚胡国栋石晓露西北工业大学航空学院西安710072

Walsh函数有限体积方法(FVM-WBF)是一种具备网格内部捕捉间断能力的新型数值方法。全局增加网格单元内Walsh基函数的数目可以有效提升FVM-WBF方法的数值分辨率,但同时会带来计算量的急剧增加。为了平衡FVM-WBF方法分辨率和计算效率之间... 详细信息

Walsh函数有限体积方法(FVM-WBF)是一种具备网格内部捕捉间断能力的新型数值方法。全局增加网格单元内Walsh基函数的数目可以有效提升FVM-WBF方法的数值分辨率,但同时会带来计算量的急剧增加。为了平衡FVM-WBF方法分辨率和计算效率之间的矛盾,利用Walsh基函数的数值特性,提出了一种结合自适应策略的Walsh函数有限体积方法。该方法根据流场特征动态调整网格单元内的Walsh基函数数目,仅在流场结构变化剧烈的局部区域使用足量的基函数,避免全局性增加基函数所引发的计算量爆发式增长。选取二维非定常双马赫反射、RayleighTaylor不稳定性问题和定常NACA0012翼型绕流为算例,将新发展的自适应Walsh函数有限体积方法与原始Walsh函数有限体积方法进行对比测试。理论分析和数值结果表明,Walsh函数有限体积方法“天然”具备便捷的自适应潜能,能够方便地依据流场特征动态地实现Walsh基函数数目的优化配置,实现高分辨率和高效率的双赢。

关键词：计算流体力学有限体积方法 Walsh函数自适应方法间断捕捉

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A density-wave-like transition in the polycrystalline V_(3)Sb_(2) sample with bilayer kagome lattice

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Chinese Physics B 2022年第1期31卷 15-23页

作者： Ningning wang Yuhao Gu M.A.McGuire Jiaqiang Yan Lifen shi Qi Cui Keyu Chen Yuxin wang Hua Zhang Huaixin Yang Xiaoli Dong Kun Jiang Jiangping Hu Bosen wang jianping Sun Jinguang Cheng Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA

Recently,transition-metal-based kagome metals have aroused much research interest as a novel platform to explore exotic topological quantum *** we report on the synthesis,structure,and physical properties of a bilayer kagome lattice compound V_(3)Sb_(2).The polycrystalline V_(3)Sb_(2) samples were synthesized by conventional solid-state-reaction method in a sealed quartz tube at temperatures below 850℃.Measurements of magnetic susceptibility and resistivity revealed consistently a density-wave-like transition at Tdw≈160 K with a large thermal hysteresis,even though some sample-dependent behaviors were observed presumably due to the different preparation *** cooling through Tdw,no strong anomaly in lattice parameters and no indication of symmetry lowering were detected in powder x-ray diffraction *** transition can be suppressed completely by applying hydrostatic pressures of about 1.8 GPa,around which no sign of superconductivity was observed down to 1.5 ***-heat measurements revealed a relatively large Sommerfeld coefficientγ=18.5 mJ·mol^(-1)·K^(-2),confirming the metallic ground state with moderate electronic *** functional theory calculations indicate that V_(3)Sb_(2) shows a non-trivial topological crystalline ***,our study makes V_(3)Sb_(2) a new candidate of metallic kagome compound to study the interplay between density-wave-order,nontrivial band topology,and possible superconductivity.

关键词： V_(3)Sb_(2) kagome metal charge density wave pressure effect

Evolution of tumor microenvironment in colorectal liver metastases under treatment stress

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Cancer Communications 2022年第5期42卷 471-475页

作者： Na Huang Dongqiang Zeng Xiaoxiang Rong Chunlin wang Zhenzhen Wu Jian Guo Yuqi wang Jin Li Jing Li Jiao wang Siting Zheng Genjie Huang jianping Bin Yulin Liao Qian Li Xin Yi wangjun Liao Min shi Department of Oncology Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdong 510515P.R.China Department of Research and Development GenePlus-BeijingBeijing 102206P.R.China Department of Cardiology Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdong 510515P.R.China

Dear editor,The tumor microenvironment(TME)heavily impacts disease biology and may influence responses to systemic treatments,and thereby,affects patients’*** our previous study,we found that immune features could predict prognosis and guide the therapy choices for stage I-III colon cancer[1,2].Increasing evidence shows that therapyinduced TME changes can promote tumor progression,metastasis,and the development of resistance[3,4].However,the TME dynamics in colorectal liver metastases(CRLM)under treatment are still incompletely clear.

关键词： colorectal metastases treatment

Bph30confers resistance to brown planthopperby fortifying sclerenchyma in rice leaf sheaths

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Molecular Plant 2021年第10期14卷 1714-1732页

作者： Shaojie shi Huiying wang Lingyun Nie Di Tan Cong Zhou Qian Zhang YiLi Bo Du jianping Guo Jin Huang DiWu Xiaohong Zheng Wei Guan Junhan Shan Lili Zhu Rongzhi Chen Longjian Xue Linda L.Walling Guangcun He State Key Laboratory of Hybrid Rice College of Life SciencesWuhan UniversityWuhan 430072China The Institute of Technological Science School of Power and Mechanical EngineeringWuhan UniversityWuhan 430072China Department of Botany and Plant Sciences University of CaliforniaARiversideCA 92521USA

Phloem-feeding insects cause massive losses in agriculture and *** plant resistance to phloem-feeding insects is often mediated by changes in phloem composition,which deter insect settling and feeding and decrease ***,we report that rice plant resistance to the phloem-feeding brown planthopper(BPH)is associated with fortification of the sclerenchyma tissue,which is located just beneath the epidermis and a cell layer or two away from the vascular bundle in the rice leaf *** found that BPHs prefer to feed on the smooth and soft region on the surface of rice leaf sheaths called the long-cell *** identified Bph30 as a rice BPH resistance gene that prevents BPH stylets from reaching the phloem due to the fortified ***30 is strongly expressed in sclerenchyma cells and enhances cellulose and hemicellulose synthesis,making the cell walls stiffer and sclerenchyma *** structurally fortified sclerenchyma is a formidable barrier preventing BPH stylets from penetrating the leaf sheath tissues and arriving at the phloem to ***30 belongs to a novel gene family,encoding a protein with two leucine-rich *** member of the family,Bph40,also conferred resistance to ***,the fortified sclerenchyma-mediated resistance mechanism revealed in this study expands our understanding of plant-insect interactions and opens a new path for controlling planthoppers in rice.

关键词： rice brown planthopper fortified sclerenchyma-mediated resistance cell wall leaf sheath breeding