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Roles of Nano-Domain Switching and Non-180° Domains in Enhancing Local Piezoelectric Responses of Highly （100）-Oriented Pb(Zr0.60Ti0.40)O3 Thin Films

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Chinese Physics Letters 2019年第10期36卷 86-89页

作者： Chen-Fei Jin Si-Qi Zhang Zhi-Qiang Shen wei-li li School of Physics Harbin Institute of TechnologyHarbin 150001 School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001

Ferroelectric Pb(Zr0.60Ti0.40)O3 thin films deposited on the niobium-doped SrTiO3 and Pt(111)/Ti/SiO2/Si substrates are fabricated by a sol-gel method.X-ray diffraction indicates that the films have a ’cube-on-cube’growth with highly(100)preferred orientation and good surface *** piezoelectric force microscopy,we investigate domain structures and butterfly amplitude loops of ferroelectric thin *** results indicate that the film deposited on Nb:SrTiO3 has both kinds of 180° polarizations perpendicular or parallel to the surface while the film deposited on Pt/Ti/SiO2/Si has irregular phase *** piezoelectric polarization are observed in the films on niobium-doped SrTiO3 with local d33* values around 45 pm/V three times more than that of the films around 13 pm/V deposited on Pt(111)/Ti/SiO2/Si. Our findings emphasize that nanodomain switching ability and non-180° domains will contribute significantly to enhance piezoelectric responses of ferroelectric thin films.

关键词： method. piezoelectric ferroelectric

Cavernous hemangioma of the ileum in a young man:A case report and review of literature

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World Journal of Clinical Cases 2022年第28期10卷 10146-10154页

作者： li Yao li-wei li Bing Yu Xiao-Dan Meng Shi-Quan liu li-Hua Xie Rong-Fen wei Jie liang Hua-Qiang Ruan Jun Zou Jie-An Huang Department of Gastroenterology The Second Affiliated Hospital of Guangxi Medical UniversityNanning 530005Guangxi Zhuang Autonomous RegionChina

BACKGROUND Small intestinal cavernous hemangioma is a rare disease,especially in the *** is difficult to accurately diagnose due to its hidden location and nonspecific clinical ***,we reported a case of ileal cavernous hemangioma with chronic hemorrhage in a 20-year-old man and review the literature to gain a better understanding of this *** SUMMARY The patient complained of intermittent melena and hematochezia for > 3 *** lowest hemoglobin level revealed by laboratory testing was 3.4 g/d L(normal range:12-16 g/dL).However,the gastroscopy,colonoscopy and peroral doubleballoon enteroscopy(DBE) showed no signs of *** transanal DBE detected a lesion at about 340 cm proximal to the ileocecal ***,we performed an exploratory laparoscopy and the lesion was *** the operation,the patient had no ***,the pathological examination identified the neoplasm as an ileal cavernous hemangioma,thereby resulting in gastrointestinal *** This report might improve the diagnosis and treatment of ileal cavernous hemangioma.

关键词： Cavernous hemangioma Ileum Gastrointestinal hemorrhage Anemia Double-balloon enteroscopy Contrast-enhanced computed tomography Case report

A 12×10 Gb/s fully integrated CMOS parallel optical receiver front-end amplifier array

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Science China(Information Sciences) 2012年第6期55卷 1415-1428页

作者： li ZhiQun,CHEN lili,li wei & ZHANG li Institute of RF-& OE-ICs,Southeast University,Nanjing 210096,China Institute of RF-& OE-ICs Southeast University Nanjing China

This paper presented a 12-channel parallel optical receiver front-end amplifier array design and realization in a low cost 0.18 μm CMOS *** channel incorporated a transimpedance amplifier and a limiting *** meet the challenge for the design of high gain front-end amplifier at date rate of up to 10 Gb/s,an optimized circuit topology was proposed and some bandwidth extension technologies were adopted,including regulated cascode,shunt peaking,and active negative *** the power consump-tion,crosstalk and noise,some corresponding solutions were presented such as applying isolation structure for parallel amplifier array,and optimization of noise and circuit parameters for 10 Gb/s *** on-wafer measurements revealed that this chip’s operation speed reached up to 10 Gb/s per channel,and 120 Gb/s with 12-channel in parallel *** a DC power of 853 mW from a 1.8 V supply voltage,the chip exhibits a conversion gain of up to 92.6 dBΩ,and a 3 dB bandwidth of 8 GHz,the output swing and input sensitivity for a bit-error rate of 10 12 at 10 Gb/s are 310 mV and 10 mVpp,*** chip size is 1142 μm×3816 μm including on-wafer testing pads.

关键词： CMOS parallel optical receiver amplifier array transimpedance amplifier limiting amplifier crosstalk isolation structure noise current

Acceptor-Donor-Acceptor Conjugated Oligomers Based on Diketopyrrolopyrrole and Thienoacenes with Four, Five and Six Rings for Organic Thin-film Transistors

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Chinese Journal of Polymer Science 2017年第4期35卷 480-489页

作者： Qian Du Jing Shao Yao Gao wei-li li Hong-kun Tian Dong-hang Yan 耿延候 Fo-song Wang School of Material Science and Engineering and Collaborative Innovation Centre of Chemical Science and Engineering(Tianjin) Tianjin University The 46th Institute of the Sixth Academy of China Aerospace Science&Industry Corporation State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences

Three acceptor-donor-acceptor （A-D-A） conjugated oligomers, i.e., O1, 02 and 03, have been synthesized using diketopyrrolopyrrole （DPP） as an electron-acceptor unit, and naphtho[1,2-b：5,6-b＇]dithiophene （NDT）, anthra[1,2-b：5,6- b＇]dithiophene （ADT） or dithieno[3,2-b：Y,2＇-b＇]naphtbo[1,2-b：5,6-b＇]dithiophene （DTNDT） as electron-donor unit. These oligomers exhibit identical highest occupied molecular orbital （HOMO） and lowest unoccupied molecular orbital （LUMO） energy levels, which were ca. -5.1 and -3.3 eV, respectively. Upon thermal annealing, all three oligomers formed thin films with ordered microstructures, and their organic thin film transistors （OTFTs） exhibited p-type transport behavior. The mobility was increased with an extension of the size of D-units. 03 showed the best OTFT performance with the mobility of up to 0.20 cm2·V-1 ·s-1. The film quality of 03 was improved by adding 1 wt% poly（methylmethacrylate）（PMMA）. In consequence, the mobility of the O3-based devices was further enhanced to 0.30 cm2·V-1 ·s-1.

关键词： Diketopyrrolopyrrole (DPP) Thienoacene Conjugated oligomers Organic thin-film transistors (OTFTs)

Mechanical properties and thermal stability of 7055 Al alloy by minor Sc addition

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Rare Metals 2020年第6期39卷 725-732页

作者： Chong-Yu liu Guang-Biao Teng Zong-Yi Ma li-li wei Wen-Biao Zhou Hong-Feng Huang Hai-Quan Qi Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Ministry of EducationGuilin University of TechnologyGuilin 541004China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Alnan Aluminium Co. LtdNanning 530000China

This study investigated the effect of 0.25 wt%Sc addition on the microstructure and mechanical properties of AA 7055 *** addition of Sc obviously refined the grains of AA 7055 alloy during casting,homogenizing,rolling,solution,and aging treatments due to the formation of primary and precipitate Al3(Sc,Zr)*** recrystallization and precipitation of AA 7055 alloy were inhibited during heat treatments by Sc *** Sccontaining AA 7055 alloy exhibited higher thermal stability than AA 7055 alloy during homogenizing treatment,because of the grain boundary pinning effect of nano-sized Al3(Sc,Zr)*** its structure characteristics such as fine grains,fineη′phase,and lessηphase,AA 7055 alloy with added Sc showed good mechanical properties after aging at 120℃for 24 h,with an ultimate tensile strength(UTS)of 679 MPa and elongation(EL)of 14%.This work provides an effective strategy to fabricate AlZn-Mg(-Cu)series(7 xxx)alloys with excellent mechanical properties.

关键词： Al alloy Sc addition Microstructure Mechanical properties

Study on the specific interaction between angiogenin and aptamer by atomic force microscopy (AFM)

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Chinese Science Bulletin 2008年第2期53卷 198-203页

作者： HE XiaoXiao JIN Rong YANG liu WANG KeMin li wei TAN weiHong li HuiMin State Key Laboratory of Chemo/Biosensing and Chemometrics Institute of Life Science and Biological Technology Engineering Center for Biomedicine College of Material Science and Technology Hunan University Key Laboratory for Bio-Nanotechnology and Molecule Engineering of Hunan Province Changsha 410082 China

The specific interaction between angiogenin and aptamer has been investigated by using AFM. The specificity of the interaction is revealed by comparing the binding probability of aptamer to other ele- ments in a series of control experiments. The results have shown that there is specific interaction force between angiogenin and aptamer. Moreover, the single molecular pull-off force between angiogenin and aptamer has also been determined using the Poisson statistical method to be 133.7±11.7 pN. These findings obtained are helpful to the better revelation of recognition mechanism between angiogenin and aptamer, which provided basis for further understanding the inhibition of the aptamer to angio- genic activity.

关键词：原子力显微术血管生成素交互作用力检测

Identification of a novel mutation in the SRD5A2 gene of one patient with 46,XY disorder of sex development

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Asian Journal of Andrology 2018年第5期20卷 518-519页

作者： Shu-Ping li li-wei li Ming-Xia Sun Xin-Xin Chen Xiu-Feng Wang Zeng-Kui li Sheng-Yun Zhou Dong-Cai Zhai Shu-Xia Geng Shu-Jun li Xiao-wei Dou The Second Clinical Laboratory Xingtai People's Hospital Xingtai 054000China Nutrition Department Xingtai People's Hospital Xingtai 054000 China Department of Paediatrics Xingtai People's Hospital Xingtai 054000 China Function Examination Department Xingtai People's Hospital Xingtai 054000 China Clinical Research Center The Affiliated Hospital of Guizhou Medical University Guiyang 550004 China

Dear Editor, 46,XY disorder of sex development （DSD） is characterized by a female phenotype in an individual with a normal 46,XY karyotype.1 The clinical phenotTpe of 46,XY DSD is characterized by bilateral undescended testes and a normal female appearance, including breasts, female external genitalia, and other secondary sex characteristics, but the absence of a uterus or ovaries.2 Development of the male external genitalia in the fetal period depends on the biosynthesis of testosterone （T）, the conversion ofT into dihydrotestosterone （DHT） by steroid 5α-reductase type 2 （SRD5A2）, and the response of functionally active androgen receptors in genital tissues） The disruption of any of these stages will block the differentiation of internal and external genitalia and cause 46,XY DSD.

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Dynamic Rheological Characterization of A Thermotropic liquid Crystalline Poly (aryl ether ketone)

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Chinese Chemical Letters 2001年第3期12卷 273-274页

作者： Hui SUN Wan Jin ZHANG Zhong Wen WU li wei li Bi Bo YANG Qiang ZHENG Department of Chemistry Jilin UniversityChangchun 130023 Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027

The rheometries ARES rheometer was applied to determining the rheological behavior of a thermotropic liquid crystalline poly (aryl ether ketone). The viscosity of the material decreases with increasing temperature. re... 详细信息

关键词： Poly (aryl ether ketone) liquid crystal nematic viscosity rheology

Simultaneously Improved Curing,Mechanical,Antioxidative Properties and Reduced ZnO Loading of Silica Filled NR Composites by Incorporation of Low-cost Crude Carbon Dots via Conventional Melt-milling Method

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Chinese Journal of Polymer Science 2024年第6期42卷 815-825页

作者： Chao-Ying Sun Hai-Jun Ji li-wei li Hui Yang Xiao-Peng An Yi-Ping Chen Ming-Jian Han Can Jiang li-Qun Zhang Peng Yu Run-Guo Wang State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan430205China

Rubbers or elastomers play an important role in hi-tech technology and civilian daily life because of their unique and strategical ***,the rubber additives are essential components for rubbers’practical ***,developing novel multifunctional additives has attracted increasing research *** this work,low-cost crude carbon dots(CCDs)were used as multifunctional additives for natural rubber/silica system(without any additional modification)through industrial compatible melt-mixing *** results revealed that the CCDs could disperse well in the NR/silica system,and they could not only endow the rubber compound with excellent anti-aging capability due to CCDs’radical scavenging activity because of their plenty of nitrogen-containing species,but also improve the curing rate and mechanical performance of the rubber ***,the CCDs could reduce the rolling resistance of the rubber composites(tanδvalue at 7%strain of the rubber composite could be decreased by 34%),which is promising for the application of energy-saving tire ***,the addition of CCDs could effectively reduce the ZnO dosage by at least 40%in the rubber composite without deteriorating its ***,this work provides valuable guidance to develop novel cheap yet effective additives for the elastomer.

关键词： Natural rubber Crude carbon dots Antioxidant ZnO reduction Vulcanization