检索结果-南通市图书馆

The dynamic surface evolution of halide perovskites induced by external energy stimulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2024年第4期11卷 185-194页

作者： Feiyu cheng Pengdong Wang Chenzhe Xu Qingliang Liao Suicai zhang Haochun Sun Wenqiang Fan Guodong Liu Zhiyun Li Yaping Kong Li Wang Fangsen Li Zhuo Kang Yue zhang Academy for Advanced Interdisciplinary Science and Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing Key Laboratory for Advanced Energy Materials and Technologies Key Laboratory of Advanced Materials and Devices for Post-Moore ChipsMinistry of EducationBeijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology Beijing Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

Tracking the dynamic surface evolution of metal halide perovskite is crucial for understanding the corresponding fundamental principles of photoelectric properties and intrinsic instability. However, due to the volatility elements and soft lattice nature of perovskites, several important dynamic behaviors remain unclear. Here, an ultra-high vacuum（UHV） interconnection system integrated by surface-sensitive probing techniques has been developed to investigate the freshly cleaved surface of CH3NH3PbBr3in situ under given energy stimulation. On this basis, the detailed three-step chemical decomposition pathway of perovskites has been clarified. Meanwhile, the evolution of crystal structure from cubic phase to tetragonal phase on the perovskite surface has been revealed under energy stimulation. Accompanied by chemical composition and crystal structure evolution, electronic structure changes including energy level position,hole effective mass, and Rashba splitting have also been accurately determined. These findings provide a clear perspective on the physical origin of optoelectronic properties and the decomposition mechanism of perovskites.

关键词： metal halide perovskite external energy stimulation surface dynamic evolution surface electronic structure ultra-high vacuum interconnection system

Petroleum geology and exploration direction of gas province in deepwater area of North Carnarvon Basin, Australia

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Geology 2020年第4期3卷 623-632页

作者： Yang-wei Feng Yan Ren Gong-cheng zhang Hong-jun Qu School of Geographical Science and Tourism Nanyang Normal UniversityNanyang 473061China Department of Geology Northwest UniversityXi’an 710069China PetroJindian(Beijing)Sci-Tech Co. Ltd.Beijing 100000China CNOOC Research Institute Co. Ltd.Beijing 100028China

North Carnarvon Basin is a gas province with minor oily sweet spots in deepwater area with water depth more than 500 m,which is one of the hot spots of global petroleum exploration for its series of giant hydrocarbon discoveries in recent ***,the degree of oil and gas exploration in deepwater area is still low,and the conditions for oil and gas accumulation are not *** on the current exploration situation and latest database of fields,applying multidisciplinary analysis of hydrocarbon geology,hydrocarbon accumulation elements and its exploration direction of North Carnarvon Basin in deepwater area are *** results show that there are three sets of main source rocks in deepwater area of North Carnarvon Basin,which are Triassic marine shale in Locker Formation and delta coal-bearing mudstone with thin carbonaceous mudstone in Mungaroo Formation,Lower–Middle Jurassic paralic carbargilite and coal measure strata in Athol Formation and Murat Formation,Cretaceous delta mudstone in Barrow Group and marine shale in Muderong *** source rock samples show gas-prone *** coarse sandstone of delta facies in Middle–Upper Triassic Mungaroo Formation is the most important reservoir in deepwater area,Lower Cretaceous Barrow Group deep-water gravity flow or underwater fan turbidite sandstone is the secondly main *** Cretaceous marine shale in Muderong Formation is most important regional *** mudstone in Mungaroo Formation is an important interlayer caprock in deepwater *** are two main reservoir accumulation assemblages in deepwater area,one is Triassic structural-unconformity plane reservoir accumulation assemblage of Locker Formation to Mungaroo Formation,and the other is Lower–Middle Jurassic Athol Formation and Murat Formation–Lower Cretaceous stratigraphic lithology-structural reservoir accumulation assemblage of Barrow Group to Muderong *** are three main control factors of hydrocarbon Ac

关键词： Mungaroo Formation Barrow Group Oil and gas exploration engineering Exmouth plateau North Carnarvon Basin Australia

GmDFB1,an ARM-repeat superfamily protein,regulates floral organ identity through repressing siRNA-and miRNA-mediated gene silencing in soybean

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第8期66卷 1620-1638页

作者： Jie Li Wenxiao zhang Qing Lu Jiaqi Sun Chuang cheng Shiyu Huang Shuo Li Qiang Li Wei zhang Chuanen Zhou Bin Liu Fengning Xiang The Key Laboratory of Plant Development and Environmental Adaptation Biology Ministry of EducationSchool of Life SciencesShandong UniversityQingdao 266237China State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

The development of flowers in soybean(Glycine max)is essential for determining the yield potential of the *** silencing pathways are involved in modulating flower development,but their full elucidation is still ***,we conducted a forward genetic screen and identified an abnormal flower mutant,deformed floral bud1-1(Gmdfb1-1),in *** mapped and identified the causal gene,which encodes a member of the armadillo(ARM)-repeat *** small RNA sequencing(sRNA-seq),we found an abnormal accumulation of small interfering RNAs(si RNAs)and microRNA(miRNAs)in the Gmdfb1 *** further demonstrated that GmDFB1 interacts with the RNA exosome cofactor SUPER KILLER7(Gm SKI7).Additionally,GmDFB1 interacts with the PIWI domain of ARGONAUTE 1(GmAGO1)to inhibit the cleavage efficiency on the target genes of s *** enhanced gene silencing mediated by siRNA and miRNA in the Gmdfb1 mutants leads to the downregulation of their target genes associated with flower *** study revealed the crucial role of GmDFB1 in regulating floral organ identity in soybean probably by participating in two distinct gene silencing pathways.

关键词： ARM-repeat superfamily protein ARGONAUTE 1 SUPER KILLER 7 flower development gene silencing small RNAs soybean

Ni-B/TiO_2 Amorphous Catalyst Used in Heavy Arenes of Petrochemicals Hydrogenation

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第12期12卷 1123-1126页

作者： Qing Yan cheng Wei LI Ying ZHOU Ming Hui zhang Nai Jia GUAN Ke Yi TAO Department of Material Chemistry Nankai UniversityTianjin 300071

A supported Ni-B/TiO2 amorphous catalyst was prepared by impregnation and reduction. It was characterized by XRD, SAED, DSC, XPS, etc.. The catalytic activity of catalyst was measured through the hydrogenation of he... 详细信息

关键词： Hydrogenation heavy arenas petrochemicals Ni-B/TiO2 amorphous catalyst.

Simple photonic-assisted radio frequency down-converter based on opto- electronic oscillator

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2014年第4期2卷 1-4页

作者： Hongchen Yu Minghua Chen Hongbiao Gao cheng Lei Heng zhang Sigang Yang Hongwei Chen Shizhong Xie Tsinghua National Laboratory for Information Science and Technology(TNList) Department of Electrical EngineeringTsinghua UniversityBeijing100084China

A photonic-assisted radio frequency(RF)down-converter integrating with the optoelectronic oscillator(OEO)-based high quality local oscillator(LO)has been proposed and experimentally *** LO and the RF input signal are mixed at the same phase modulator and photo-detector(PD)of the OEO-loop without any additional modulator or *** working bandwidth of the proposed RF down-converter is nearly from 2.5 to 10 *** performance of the proposed down-converter is presented and the spurious frequency dynamic range at frequency of 5.5 GHz with the LO at 6.138 GHz is measured to be 98.4 dB–Hz2∕*** influences that the frequency range and power of the RF input signal bring to the system are discussed as well.©2014 Chinese Laser Press.

关键词： modulator converter frequency

Zebrafish ppp1r21 mutant as a model for the study of primary biliary cholangitis

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 Genetics and Genomics 2023年第12期50卷 1004-1013页

作者： Chaoying Wu Wenfeng zhang Yiyu Luo Chaoqing cheng Xinjuan Wang Yan Jiang Shuang Li Lingfei Luo Yun Yang Institute of Developmental Biology and Regenerative Medicine Southwest UniversityBeibeiChongqing 400715China

Primary biliary cholangitis (PBC) is an autoimmune cholestatic liver disease that progresses to fibrosis and cirrhosis, resulting from the gradual destruction of intrahepatic bile ducts. Exploring genetic variants associated with PBC is essential to understand the pathogenesis of PBC. Here we identify a zebrafish balloon dog (blg) mutant with intrahepatic bile duct branching defects, exhibiting several key pathological PBC-like features, including immunodominant autoantigen PDC-E2 production, cholangiocyte apoptosis, immune cell infiltration, inflammatory activation, and liver fibrosis. blg encodes the protein phosphatase 1 regulatory subunit 21 (Ppp1r21), which is enriched in the liver and its peripheral tissues and plays a vital role in the early intrahepatic bile duct formation stage. Further studies show an excessive activation of the PI3K/AKT/mTOR pathway in the hepatic tissues in the mutant, while treatment with the pathway inhibitor LY294002 and rapamycin partially rescues intrahepatic bile duct branching defects and alleviates the PBC-like symptoms. These findings implicate the potential role of the Ppp1r21-mediated PI3K/AKT/mTOR pathway in the pathophysiology of PBC.

关键词： Zebrafish mutant ppp1r21 Primary biliary cholangitis PDC-E2 PI3K/AKT/mTOR pathway

Apparent Kinetics for Electrosynthesis Process of Chromic Acid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2009年第4期25卷 532-536页

作者： LI cheng-wei WANG Fu-an QI Tao WANG Rui-lin TANG Xiao-hong zhang Yong-qiang Department of Chemistry Henan institute of Education Zhengzhou 450014 P. R. China College of Chemical Engineering Zhengzhou University Zhengzhou 450002 P. R. China Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 P. R. China

A new green technique for producing chromic acid via an electrosynthesis method was *** kinetic experiments were carried out on the direct electrosynthesis reaction of chromic acid from sodium dichromate in a self-made electrosynthesis reactor with a multiple-unit metal oxides combination anode,a stainless steel cathode,and a reinforcing combination Nafion 324 cation exchange *** apparent kinetic data were experimentally measured at different reaction time under different reaction conditions by relating many essential cell processes and their interaction,as well as their synergistic effect to the whole electrochemical synthesis *** results show that the electrosynthesis reaction process follows a quasi-first-order reaction kinetic *** apparent kinetic model of the electrosynthesis reaction was established,and kinetic parameters were calculated.

关键词： Apparent kinetics Chromic acid Electrosynthesis method Kinetic model

Clinicopathological analysis of 14 patients with combined hepatocellular carcinoma and cholangiocarcinoma

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2011年第6期10卷 620-625页

作者： Xian-Huan Yu,Lei-Bo Xu,Hong Zeng,Rui zhang,Jie Wang and Chao LiuAuthor Affiliations:Department of Hepato-Pancreato-Biliary Surgery and Department of Pathology,Sun Yat-sen Memorial Hospital,Sun Yat-sen University,Guangzhou 510120,China Department of Hepato-Pancreato-Biliary Surgery Sun Yat-Sen Memorial Hospital Sun Yat-Sen University Guangzhou 510120 China Department of Pathology Sun Yat-Sen Memorial Hospital Sun Yat-Sen University Guangzhou 510120 China

BACKGROUND:Combined hepatocellular carcinoma and cholangiocarcinoma (cHCC-CC) is an uncommon subtype of primary hepatic carcinoma,and its prognosis is *** study was undertaken to investigate the prognosis and the clinicopathological characteristics of cHCC-CC,including their possible cellular ***:Among 852 patients with a primary hepatic carcinoma who underwent hepatectomy from January 1998 to April 2008 at our hospital,cHCC-CC was identified in 14 patients The clinicopathological characteristics of the 14 patients were analyzed *** expression of the liver stem cell markers (c-kit,CD90,CD133 and CK19) in the tumor tissue was detected by immunohistochemistry,and the Kaplan-Meier method was used to evaluate ***:Among the 14 patients,9 presented with abdominal pain,3 with anorexia and debilitation,and the remaining two patients were *** mean age was 53.6±3.0 (range 38-74) *** the included patients,11 had an elevated serum alpha-fetoprotein level,13 were infected with hepatitis B virus,9 had vascular invasion and 1 had lymph node metastasis The average diameter of the tumors was 9.9±1.1 (range 5.0-16.0) *** median overall survival time was 7.9±1.0 months In addition,the presence of the liver stem cell markers,c-kit CD90,CD133 and CK19 was 71.4%,85.7%,92.9% and 78.6% *** four markers were simultaneously expressed in eight ***:cHCC-CC has aggressive characteristics and the prognosis is extremely *** high expression of liver stem cell markers in the tumor tissue suggests that these tumors may derive from liver stem cells.

关键词： liver neoplasms hepatocellular carcinoma cholangiocarcinoma prognosis stem cells

Fabrication, Characterization and Optical Properties of TiO2 Nanotube Arrays on Boron-doped Diamond Film Through Liquid Phase Deposition

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2014年第1期30卷 18-22页

作者： YUAN Jujun LI Hongdong WANG Qiliang cheng Shaoheng zhang Xianke YU Huajun ZHU Xiurong XIE Yingmao College of Physics and Electronics Gannan Normal University Ganzhou 341000 P. R. China State Key Laboratory of Superhard Materials Jilin University Changehun 130012 P. R. China Institute of Optoelectronie Materials and Technology Gannan Normal University Ganzhou 341000 P. R. China

TiO2 nanotube（TiNT） arrays were deposited on boron-doped diamond films by a liquid-phase deposition method with ZnO nanorod arrays as the *** different morphologies of TiNTs have been obtained by controlling the morphology of ZnO *** X-ray diffraction and energy-dispersive X-ray analysis show that the ZnO nanorod array template has been removed in the TiNTs formation *** crystalline quality of the TiNTs is improved by increasing the annealing *** band gap of the TiNTs is about 3.25 eV estimated by the UV-Vis absorption spectroscopy,which is close to the value of bulk *** the photoluminescence spectrum,a broad visible emission in a range of ca.550-750 nm appears due to the surface oxygen vacancies and defects.

关键词： TiO2 nanotube array Boron doped diamond Lquid phase deposition Optical property