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Photocurrent hysteresis related to ion motion in metal-organic perovskites

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Science China Chemistry 2017年第3期60卷 396-404页

作者： Xiaobao Xu Mingkui Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology

Perovskite solar cells have attracted considerable attention in the photovoltaic field for their high efficiency achieved in a short period of ***,hystersis behaviour was often observed during the photocurrent-voltage measurement causes uncertainty in evaluation of photovoltaic *** this letter,we report a systematic investigation on the cause of hysteresis via series of TiO_2 based planar heterojunction structured perovskite solar cell *** results reveal organic cation ions,such as the commonly employed CH_3NH_3^+ or HC(NH_2)_2^+,play critical role on the observed hysteresis effect above the 298 K via interaction with *** further suggest an efficient hole/electron transport in devices can inhibit such hysteresis *** conclusion sheds light onto the underlying hysteresis mechanisms,and proposes possible solutions to overcome the issue,which offers guidelines for future development of perovskite devices.

关键词： perovskite solar cell hysteresis trap/de-trap ionic motion

Exploring stability of formamidinium lead trihalide for solar cell application

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Science Bulletin 2017年第4期62卷 249-255页

作者： Mingkui Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China

Formamidinium lead triiodide （FAPbI3） is a promising photoactive perovskite for low-cost and efficient solar cells. This article reports on an experimental investigation on the stability of FAPbI3 by comparison with that of widely-used methylamidinium lead triiodide （MAPbI3）. A hydration of the FAPbI3 with mois- ture could be the dominant mechanism for its degradation in air, rather than a common thermal decom- position in the MAPbI3. This can be mainly contributed to a relatively strong bond formation between formamidinium ions （FA＋） and 1-. Consequently, the stability of FAPbl3 based devices can be greatly enhanced by removal moisture in the surrounding. This conclusion renders FAPbI3 extremely attractive for stable perovskite solar cells with fine encapsulation.

关键词： Perovskite Solar cell Stability Cation

Measurement Uncertainty Assessment of Magnesium Trisilicate Column for Determination of Sudan Colorants in Food by HPLC Using C8 Column

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Journal of Huazhong University of Science and Technology(medical Sciences) 2016年第5期36卷 752-757页

作者：陈颖贺超程井军黄文耀邵生文蒋亚萍戴凌峰刘家发宋毅 hubei Provincial Key Laboratory for Applied Toxicology Hubei Center for Disease Control and Prevention Institute of Cardiology China Three Gorges University Acuo-moxibustion College Hubei University of Chinese Medicine

This study aimed to conduct measurement uncertainty assessment of a new method for determination of Sudan colorants（Sudan Ⅰ, Ⅱ, Ⅲ and Ⅳ） in food by high performance liquid chromatography（HPLC）. Samples were extracted with organic solvents（hexane, 20% acetone） and first purified by magnesium trisilicate（2Mg O·3Si O2）. The Sudan colorants（Sudan Ⅰ–Ⅳ） were also initially separated on C8 by gradient elution using acetonitrile and 0.1%（v/v） formic acid aqueous solution as the mobile phases and detected with diode-array detector（DAD）. The uncertainty of mathematical model of Sudan Ⅰ, Ⅱ, Ⅲ, Ⅳ is based on EURACHEM guidelines. The sources and components of uncertainty were calculated. The experiment gave a good linear relationship over the concentration from 0.4 to 4.0 μg/m L and spiked recoveries were from 74.0% to 97.5%. The limits of determination（LOD） were 48, 61, 36, 58 μg/kg for the four analytes, respectively. The total uncertainty of Sudan colorants（Sudan Ⅰ, Ⅱ, Ⅲ and Ⅳ） was 810±30.8, 790±28.4, 750±27.0, 730±50.0 μg/kg, respectively. The recovery uncertainty was the most significant factor contributing to the total uncertainty. The developed method is simple, rapid, and highly sensitive. It can be used for the determination of trace Sudan dyes in food samples. The sources of uncertainty have been identified and uncertainty components have been simplified and considered.

关键词： Sudan uncertainty simplified acetone separated magnesium acetonitrile initially hexane expanded

A New Method for Fitting Current–Voltage Curves of Planar Heterojunction Perovskite Solar Cells

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Nano-Micro Letters 2018年第1期10卷 45-52页

作者： Peizhe Liao Xiaojuan Zhao Guolong Li Yan Shen Mingkui Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Ningxia University

Herein we propose a new equivalent circuit including double heterojunctions in series to simulate the current–voltage characteristic of P–I–N planar structure perovskite solar cells. This new method can theoretically solve the dilemma of the parameter diode ideal factor being larger than2 from an ideal single heterojunction equivalent circuit,which usually is in the range from 1 to 2. The diode ideal factor reflects PN junction quality, which influences the recombination at electron transport layer/perovskite and perovskite/hole transport layer interface. Based on the double PN junction equivalent circuit, we can also simulate the dark current–voltage curve for analyzing recombination current(Shockley–Read–Hall recombination) and diffusion current(including direct recombination), and thus carrier recombination and transportation characteristics. This new model offers an efficacious and simple method to investigate interfaces condition, film quality of perovskite absorbing layer and performance of transport layer, helping us furtherimprove the device efficiency and analyze the working mechanism.

关键词： Dark current Device simulation Junction property Perovskite Solar cell

Full laparoscopic anatomical liver segment Ⅶ resection with preferred Glissonean pedicle and dorsal hepatic approach

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Hepatobiliary & Pancreatic Diseases International 2023年第5期22卷 532-536页

作者： Jia Zhou Ying-Hui Song Yu-Chen Qi Ou Li Guo-Yi Xia Meng-Jun Mo Chuang Peng Su-Lai Liu Department of Hepatobiliary Surgery Hunan Provincial People’s Hospital(The First Affiliated Hospital of Hunan Normal University)Changsha 410005China Hunan Research Center of Biliary Disease Changsha 410005China Central Laboratory of Hunan Provincial People’s Hospital(The First Affiliated Hospital of Hunan Normal University) Changsha 410005China Department of Pathology Hunan Provincial People’s Hospital(The First Affiliated Hospital of Hunan Normal University)Changsha 410005China

Anatomical liver resection was an option for liver cancer proposed by the Japanese scholar Masatoshi Makuuchi in 1985 [1].Reich et *** the first laparoscopic liver resection in1991 [2].The safety and effectiveness of laparoscopic anatomical liver resection had been verified in recent years [2-4].However,laparoscopic anatomical segmentⅦliver resection (LAS7) was the most difficult procedure because of complex adjacent structures,difficult exposure,and limited laparoscopic view [3,5].

关键词： resection laparoscopic hepatic

Early postsurgical lethal outcome due to splenic littoral cell angioma:A case report

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World Journal of Clinical Cases 2023年第5期11卷 1188-1197页

作者： Fan Jia Han Lin Yi-Long Li Jin-Ling Zhang Liang Tang Peng-Tian Lu Yu-Qing Wang Yi-Feng Cui Xiu-Hua Yang Zhao-Yang Lu Department of Abdominal Ultrasound First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Hepatic Surgery Key Laboratory of Hepatosplenic SurgeryMinistry of EducationThe First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Pancreatic and Biliary Surgery Key Laboratory of Hepatosplenic SurgeryMinistry of EducationThe First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Radiology and Nuclear Medicine The First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Pathology The First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Hematopathology First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina

BACKGROUND Littoral cell angioma(LCA)is a rare benign vascular tumor of the *** its rarity,standard diagnostic and therapeutic recommendations have yet to be developed for reported *** is the only method of obtaining a pathological diagnosis and providing treatment to obtain a favorable *** SUMMARY A 33-year-old female presented with abdominal pain for one *** tomography and ultrasound revealed splenomegaly with multiple lesions and two accessory *** patient underwent laparoscopic total splenectomy and accessory splenectomy,and splenic LCA was confirmed by *** months after surgery,the patient presented with acute liver failure,was readmitted,rapidly progressed to multiple organ dysfunction syndrome and *** Preoperative diagnosis of LCA is *** systematically reviewed online databases to identify the relevant literature and found a close relationship between malignancy and *** a patient suffers from both splenic tumors and malignancy or immune-related disease,LCA is *** to potential malignancy,total splenectomy(including accessory spleen)and regular follow-up after surgery are *** LCA is diagnosed after surgery,a comprehensive postoperative examination is needed.

关键词： Littoral cell angioma Imaging features Malignancy Immunodysregulation Treatment Case report

Global climate change and human health:Pathways and possible solutions

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Eco-Environment & Health 2022年第2期1卷 53-62页

作者： Qi Zhao Pei Yu Rahini Mahendran Wenzhong Huang Yuan Gao Zhengyu Yang Tingting Ye Bo Wen Yao Wu Shanshan Li Yuming Guo Department of Epidemiology School of Public HealthCheeloo College of MedicineShandong UniversityJinanChina Department of Epidemiology and Preventive Medicine School of Public Health and Preventive MedicineMonash UniversityMelbourne3004Australia

Global warming has been changing the planet’s climate pattern,leading to increasing frequency,intensity and duration of extreme weather events and natural *** climate-changing events affect various health outcomes adversely through complicated *** paper reviews the main signs of climate change so far,e.g.,suboptimal ambient temperature,sea-level rise and other conditions,and depicts the interactive pathways between different climate-changing events such as suboptimal temperature,wildfires,and floods with a broad range of health ***,the modifying effect of socioeconomic,demographic and environmental factors on the pathways is summarised,such that the youth,elderly,females,poor and those living in coastal regions are particularly susceptible to climate *** Earth as a whole is expected to suffer from climate change,this review article discusses some potential benefits for certain regions,e.g.,a more liveable environment and sufficient food ***,we summarise certain mitigation and adaptation strategies against climate change and how these strategies may benefit human health in other *** review article provides a comprehensive and concise introduction of the pathways between climate change and human health and possible solutions,which may map directions for future research.

关键词： Climate change Health Pathways Adaptation Mitigation

Not just a sponge:novel functions of circRNAs in cholangiocarcinoma

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Clinical Research Communications 2022年第4期5卷 27-31页

作者： Jie-Han Li Hao-Lin Bao Zi-Yue Huang Zi-Xin Liang Ning Lin Chun-Jie Ni Yi Xu Department of Hepatopancreatobiliary Surgery Second Affiliated Hospital of Harbin Medical UniversityHarbin 150001China Department of Pathology School of Clinical MedicineLi Ka Shing Faculty of MedicineThe University of Hong KongHong Kong 999077China Key Laboratory of Functional and Clinical Translational Medicine Fujian Province UniversityXiamen Medical CollegeXiamen 361000China Jiangsu province Engineering Research Center of Tumor Targeted Nano Diagnostic and Therapeutic Materials Yancheng Teachers UniversityYancheng 224000China Key Laboratory of Myocardial Ischemia Ministry of EducationHarbin Medical UniversityHarbin 150001China

Cholangiocarcinoma(CCA)is one of the most common and highly malignant tumors,and its incidence and mortality rates are increasing *** RNAs(circRNAs),a class of closed-loop non-coding RNAs formed by reverse splicing of exons or introns,play an essential regulatory role in CCA and have been a hot topic of medical research in recent *** addition,about 80%of current research reports focus on the ability of circRNAs to sponge miRNAs in ***,as research continues,circRNAs are more than just a sponge in CCA;they can also alter protein subcellular localization,encode proteins and affect other cells via extracellular vesicles(EVs).Interestingly,circRNAs not only serve as novel players in CCA pathogenesis but also as potential biomarkers and therapeutic targets for CCA.

关键词： cholangiocarcinoma circular RNA miRNA sponge extracellular vesicles