检索结果-南通市图书馆

Dendrochronology-based stand growth estimation of Larix olgensis forest in relation with climate on the eastern slope of Changbai Mountain, NE China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2013年第4期7卷 429-438页

作者： Bo lin qianqian XU Wenhui LIU Guochun ZHANG Qiongyao XU Qijing LIU Key Laboratory of Forest Cultivation Department of Forest Sciences Beijing Forestry University Beijing 100083 China

The eastern slope of Changbai Mountain is characterized by pure larch forest （Larix olgensis） with little human disturbance. Response of tree growth to climate in this area remains unknown. Meanwhile, little is known about how climate variations affect the biomass increase which could be recognized as a three-dimensional tree growth index. The objective of this study is to investigate the climate effects on the radial and biomass growth of larch on eastem slope of Changbai Mountain. Tree-ring width chronologies and mean annual biomass increment were established using tree-ring data. We used correlation analysis and multiple regression analysis to explore the relationship between larch growth and climatic factors from 1957 to 2009. Results show that tree-ring growth and mean annual biomass increment were primarily and significantly affected by previous year climatic variables with slight difference among months. Temperatures were more consistently and strongly corre- lated to the chronologies and mean annual biomass increment than was precipitation. Temperature is the main factor limiting larch growth on Changbai Mountain and the ongoing climate warming may accelerate the growth of the species. The current stand biomass of the area was ***-1 and the annual stand biomass increment in 2009 was 2.91 ***-1. In conclusion, the old-growth forest in the study area is still accumulating carbon efficiently.

关键词： Larix olgensis tree ring climatic factors,biomass China

On the unipolarity of charge transport in methanofullerene diodes

在线全文

学校读者我要写书评

暂无评论

npj Flexible Electronics 2017年第1期1卷 100-105页

作者： Ardalan Armin Safa Shoaee qianqian lin Paul L Burn Paul Meredith Centre for Organic Photonics&Electronics The University of QueenslandSt Lucia CampusBrisbaneQLD 4072Australia Centre for Engineered Quantum Systems School of Mathematics and PhysicsThe University of QueenslandSt Lucia CampusBrisbaneQLD 4072Australia Institute of Physics and Astronomy University of PotsdamKarl-Liebknecht-Straße 24-25Potsdam-Golm D-14476Germany Clarendon Laboratory Department of PhysicsThe University of OxfordParks Road OxfordOxfordOX13PUUK Department of Physics Swansea UniversitySingleton ParkSwanseaWales SA28PPUK

Fullerenes are electron transporting organic semiconductors with a wide range of *** particular,methanofullerenes have been the preferred choice for solution-processed solar cells and *** wide applicability of fullerenes as both‘ntype’transport materials and electron acceptors is ***,what is still a matter of debate is whether the fullerenes can also support efficient transport of holes,particularly in diode *** this letter,we utilize a number of recently developed experimental methods for selective electron and hole mobility *** show for the two most widely used solution processable fullerenes,PC70-and-PC60BM,that whilst both exhibit electron mobilities as high as 10^(−3)cm^(2)/Vs,their hole mobilities are<10^(−9)cm^(2)/*** charge transport in these fullerenes can be considered predominantly unipolar in diode configurations.

关键词： charge utilize polarity

Flexible all-organic photodetectors via universal water-assisted transfer printing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Innovation 2023年第4期4卷 39-46页

作者： Yang Tang Ruiming Li Rui Sun Jie Min qianqian lin Chuluo Yang Guohua Xie Sauvage Center for Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan UniversityWuhan 430072China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China The Institute of Flexible Electronics(Future Technologies) Xiamen UniversityXiamen 361005China Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072China The Institute for Advanced Studies Wuhan UniversityWuhan 430072China

Transfer printing of small-molecular organic semiconductors often faces challenges due to surface adhesion ***,we developed a sacrificing-layer-assisted transfer printing technique for the deposition of smallmolecular thin ***-boiling-point ethylene glycol(EG)was doped in aqueous solution poly(3,4-ethylenedioxythiophene)polystyrene sulfonate(PEDOT:PSS)as the sacrificing layer to manipulate residual water in film,which allowed chlorobenzene solution to spontaneously spread and form uniform film.

关键词： film transfer allowed

Novel germline mutations in MLH1 and PMS2 in familial Lynch syndrome

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gynecology and Obstetrics Clinical Medicine 2022年第2期2卷 100-103页

作者： Yuhan Cai Xiaohan Chang Congrong Liu qianqian lin Hua Li Department of Obstetrics and Gynecology Peking University Third HospitalChina Department of Pathology Peking University Third HospitalChina Department of Obstetrics and Gynecology Beijing Chao-Yang HospitalCapital Medical UniversityChina

Lynch syndrome(LS),an autosomal dominant inherited syndrome causing tumor predisposition,is often associated with colorectal cancer(CRC)and,second most commonly,endometrial cancer(EC).1–3 It is caused by a heterozygous(one allele affected)inactivating germline mutation in one of the mismatch repair(MMR)genes;germline deletion of the epithelial cell adhesion molecule(EPCAM)gene may also result in LS.4–6 Here,we report a Chinese family with LS,identifying two novel mutations in MMR(mismatch repair)genes that are related to LS development and may facilitate its diagnosis.

关键词： MLH1 cancer colorectal

Unraveling the influence of interface defects on antimony trisulfide solar cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第3期78卷 262-267,I0008页

作者： Hongyi Chen Cheng Wang Shaoying Wang Ruiming Li Yan Zeng Zhe Li Zhengwei Ou qianqian lin Jianmin Li Ti Wang Hongxing Xu School of Physics and Technology and Key Laboratory of Artiﬁcial Micro-and Nano-structures of Ministry of EducationWuhan UniversityWuhan 430072HubeiChina Wuhan Institute of Quantum Technology Wuhan 430206HubeiChina School of Microelectronics Wuhan UniversityWuhan 430072HubeiChina

Antimony trisulfide(Sb_(2)S_(3)) solar cells suffer from large open circuit voltage deficits due to their intrinsic defects which limit the power conversion ***,it is important to elucidate these defects’ origin and defects at the ***,we discover that sulfide radical defects have a significant impact on the performance of Sb_(2)S_(3)solar ***,it has been illustrated that these defects at the CdS/Sb_(2)S_(3)interface can be reduced by optimizing the deposition process.A trap distribution model is used to quantify the defect density at the CdS/Sb_(2)S_(3)*** shows that the interface defects can be reduced by24% by improving the deposition *** work reveals the importance of interface defects and guides the future optimization of Sb_(2)S_(3)solar cells.

关键词： Antimony trisulﬁde Interface defect Transient absorption spectroscopy

Organic molecules with dual triplet-harvesting channels enable efﬁcient X-ray scintillation and imaging

在线全文

学校读者我要写书评

暂无评论

Aggregate

Aggregate 2024年第3期5卷 232-238页

作者： Lisi Zhan Yalun Xu Tianhao Chen Yang Tang Cheng Zhong qianqian lin Chuluo Yang Shaolong Gong Department of Chemistry Hubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsWuhan UniversityWuhanChina Key Lab of Artiﬁcial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhanChina Shenzhen Key Laboratory of New Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhenChina

Organic scintillators have recently gained considerable attentions in X-ray detection for their potential applications in biomedical radiograph and security ***,the weak X-ray absorption and/or inefﬁcient exciton utilization have limited the development and commercialization of organic ***,high-performance X-ray organic scintillators are scarce and organic scintillators with dual triplet-harvesting channels have not been explored ***,we develop several proof-of-concept sulfone-based organic molecules,C1–C7,using different alkoxy chains to manipulate molecular packing *** materials exhibit dual triplet-harvesting channels of thermally activated delayedﬂuorescence(TADF)and room-temperature phosphorescence(RTP)in aggregated ***,these molecules display distinct radioluminescence under the X-ray *** them,C6 behaves the highest light yield of 16,558 photons ***,clear X-ray images are demonstrated in both aggregated state and single-molecule *** spatial resolutions of 15.0 and 10.6 line pairs per millimeter(lp mm-1)are achieved for rigid andﬂexible scintillator screens,exceeding most reported organic and conventional inorganic *** results highlight the great potential of organic molecules with TADF and RTP nature for efﬁcient X-ray scintillation and imaging.

关键词： alkoxy chain engineering organic scintillators radioluminescence room-temperature phosphorescence thermally activated delayedﬂuorescence X-ray imaging

Surface repair of wide-bandgap perovskites for high-performance all-perovskite tandem solar cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第6期93卷 64-70,I0003页

作者： Xiaojing Lv Weisheng Li Jin Zhang Yujie Yang Xuefei Jia Yitong Ji qianqian lin Wenchao Huang Tongle Bu Zhiwei Ren Canglang Yao Fuzhi Huang Yi-Bing Cheng Jinhui Tong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina Department of Electrical and Electronic Engineering Photonics Research Institute(PRI)Research Institute for Intelligent Wearable Systems(iWEAR)The Hong Kong Polytechnic University999077Hong KongChina Laboratory of Advanced Materials Fudan UniversityShanghai 200438China Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200GuangdongChina

Wide-bandgap(WBG)perovskite solar cells(PSCs)play a fundamental role in perovskite-based tandem solar ***,the efficiency of WBG PSCs is limited by significant open-circuit voltage losses,which are primarily caused by surface *** this study,we present a novel method for modifying surfaces using the multifunctional S-ethylisothiourea hydrobromide(SEBr),which can passivate both Pb^(-1)and FA^(-1)terminated surfaces,Moreover,the SEBr upshifted the Fermi level at the perovskite interface,thereby promoting carrier *** proposed method was effective for both 1.67 and 1.77 eV WBG PSCs,achieving power conversion efficiencies(PCEs)of 22.47%and 19.90%,respectively,with V_(OC)values of 1.28 and 1.33 V,along with improved film and device *** this advancement,we were able to fabricate monolithic all-perovskite tandem solar cells with a champion PCE of 27.10%,This research offers valuable insights for passivating the surface trap states of WBG perovskite through rational multifunctional molecular engineering.

关键词： Wide-bandgap perovskite Surface defect Multifunctional molecule All-perovskite tandem solar cells

在线全文

学校读者我要写书评

暂无评论

预防直肠癌术后吻合口漏的操作技巧

中华胃肠外科杂志 2018年第4期21卷 399-403页

作者：邵仟仟林国乐中国医学科学院北京协和医学院北京协和医院基本外科 100730

如何降低直肠癌术后吻合口漏的发生是结直肠外科医师共同面临的难题。本文旨在与同道们分享一些临床中预防直肠癌术后吻合口漏的手术操作技巧，包括：（1）直肠癌全系膜切除术中低位结扎肠系膜下血管，可改善吻合口血供，减小吻合口张... 详细信息

如何降低直肠癌术后吻合口漏的发生是结直肠外科医师共同面临的难题。本文旨在与同道们分享一些临床中预防直肠癌术后吻合口漏的手术操作技巧，包括：（1）直肠癌全系膜切除术中低位结扎肠系膜下血管，可改善吻合口血供，减小吻合口张力。进而降低吻合口漏风险。而高位结扎肠系膜下动脉后吻合口血供差、张力高，会大大增加发生吻合口漏的风险。（2）对于术前行新辅助放化疗、或术中行超低位前切除术的直肠癌患者，应联合行保护性肠造口术,以降低吻合口漏的发生；而对于行低位前切除术及前切除术的直肠癌患者，若无其他合并危险因素，不建议行保护性肠造口术。（3）吻合口附近推荐常规留置腹（盆）腔引流管，不仅可以降低吻合口漏的发生率，还可早期识别吻合口漏,且通畅引流经吻合口漏出的盆腔积液可对吻合口漏进行保守治疗。（4）对于吻合口血供及张力欠佳的患者，可在腔内器械吻合后视情况行腔镜下加固缝合。可采用3-0或4—0可吸收缝线行连续缝合，或在吻合薄弱处至少行2针间断缝合。但这种加固缝合仅适用于具有丰富腔镜下缝合经验的外科医生，骨盆狭小的男性患者及低位直肠癌患者因操作空间有限，行加固缝合时应慎重。（5）对于存在可疑机械性不完全吻合患者，推荐术中行漏气试验检测吻合完整性。（6）由经验丰富的外科医师主刀手术能显著降低直肠癌术后吻合口漏的发生率。

关键词：直肠肿瘤吻合口漏手术技巧预防措施

Phase-stable wide-bandgap perovskites enabled by suppressed ion migration

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第9期96卷 120-128页

作者： Zhiyu Gao Yu Zhu Jingwei Zhu Cong Chen Zongjin Yi Yi Luo Yuliang Xu Kai Wu Tianshu Ma Fangfang Cao Zijun Chen Fang Yao Juncheng Wang Wenwu Wang Chuanxiao Xiao Hao Huang Hongxiang Li qianqian lin Pei Cheng Changlei Wang Xia Hao Guanggen Zeng Dewei Zhao College of Materials Science and Engineering&Institute of New Energy and Low-Carbon Technology&Engineering Research Center of Alternative Energy Materials and Devices Ministry of EducationSichuan UniversityChengdu 610065SichuanChina School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of ChinaSoochow UniversitySuzhou 215006JiangsuChina Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina Ningbo New Materials Testing and Evaluation Center Co.Ltd Ningbo 315201ZhejiangChina State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structure&School of Resources Environment and MaterialsGuangxi UniversityNanning 530004GuangxiChina Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina

Wide-bandgap(>1.7 eV)perovskites suffer from severe light-induced phase segregation due to high bromine content,causing irreversible damage to devices ***,the strategies of suppressing photoinduced phase segregation and related mechanisms have not been fully ***,we report a new passivation agent 4-aminotetrahydrothiopyran hydrochloride(4-ATpHCl)with multifunctional groups for the interface treatment of a 1.77-eV wide-bandgap perovskite film.4-ATpH^(+)impeded halogen ion migration by anchoring on the perovskite surface,leading to the inhibition of phase segregation and thus the passivation of defects,which is ascribed to the interaction of 4-ATpH^(+)with perovskite and the formation of low-dimensional ***,the champion device achieved an efficiency of 19.32%with an open-circuit voltage(V_(OC))of 1.314 V and a fill factor of 83.32%.Moreover,4-ATpHCl modified device exhibited significant improved stability as compared with control *** target device maintained 80%of its initial efficiency after 519 h of maximum power output(MPP)tracking under 1 sun illumination,however,the control device showed a rapid decrease in efficiency after 267 ***,an efficiency of 27.38%of the champion 4-terminal all-perovskite tandem solar cell was achieved by mechanically stacking this wide-bandgap top subcell with a 1.25-eV low-bandgap perovskite bottom subcell.

关键词： Wide-bandgap perovskite Phase segregation lon migration Interface post-treatment All-perovskite tandems