检索结果-南通市图书馆

Microstructure and Ferroelectric Properties of (Bi_(0.9)Ho_(0.1))_(3.999)Ti_(2.997)V_(0.003)O_(12) Thin Films Prepared by Sol-gel Method for Nonvolatile Memory

在线全文

学校读者我要写书评

暂无评论

Journal of materials science & technology 2010年第8期26卷 679-681页

作者： chengju fu zhixiong huang jie li dongyun guo school of materials science and Engineering Wuhan University of Technology Wuhan 430070 China school of Mechanical Engineering Chongqing University of Science and Technology Chongqing 400042 China

The （Bi0.9Ho0.1）3.999Ti2.997V0.003012 （BHTV） films have been prepared on Pt/Ti/SiO2/Si substrates by solgel method. The microstructure and ferroelectric properties of the BHTV films were investigated. The BHTV films show a single phase of Bi-layered Aurivillius structure and dense microstructure. The Ho3＋/V5＋ cosubstitution can effectively improve the ferroelectric properties. The BHTV film exhibits good ferroelectric properties with 2Pr of 47.6℃/cm2, 2Ec of 265 kV/cm （at applied field of 420 kV/cm）, dielectric constant of 305, dielectric loss of 0.031 （at 1 MHz）, good insulting behavior, as well as the fatigue-free behavior.

关键词： (Bi0.9Ho0.1)3.999Ti2.997V0.003O12 thin films Sol-gel method Co-substitution Ferroelectric properties Dielectric properties

Effect of Bi content in precursor solutions on microstructure and ferroelectric properties of bismuth cerium titanate thin films

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2009年第4期52卷 878-882页

作者： fu chengju huang zhixiong li jie guo dongyun school of materials science and technology Wuhan University of TechnologyWuhan 430070China school of Mechanical Engineering Chongqing University of Science and TechnologyChongqing 400042China Department of Physics Wuhan UniversityWuhan 430072China

Sol-gel derived bismuth cerium titanate (BCT) thin films with different Bi contents in precursor solu- tions were deposited on the Pt/Ti/SiO2/Si substrates. The effect of Bi content in the precursor solutions on the microstructure and ferroelectric properties of the films was investigated. It is found that with Bi content increasing from 90% to 110% of the nominal value in the precursor solutions, the dissipation factor and leakage current density of the BCT films obtained decrease, while the grain sizes, dielectric constant and remanent polarizations (2Pr) increase, and concurrently, a Bi-deficient phase of Bi2Ti2O7 gradually disappears. The film prepared from solution with 110% of the nominal Bi content exhibits pure Bi-layered Aurivillius polycrystalline phase, and the 2Pr value and coercive field value are 67.1 μC/cm2 and 299.7 kV/cm, respectively. Their dielectric constant and the dissipation factor are about 172 and 0.033 at 1 kHz, respectively. Moreover, this film shows no polarization fatigue after 4.46×109 switching cycles.

关键词： Bi3.4Ce0.6Ti3O12 thin films sol-gel method Bi content microstructure ferroelectric properties

Manipulation of Na_(3)V_(2)(PO_(4))_(2)F_(3) via aluminum doping to alter local electron states toward an advanced cathode for sodiumion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4253-4262页

作者： Shi-Min Wang Jin-Qi li li Xu Meng-Jiao Sun Wen-Jin huang Qing liu fu-Tong Ren Yong-Jiang Sun ling-Yan Duan Hang Ma Hong guo International Joint Research Center for Advanced Energy materials of Yunnan Province Yunnan Key Laboratory of Carbon Neutrality and Green Low-Carbon TechnologiesSchool of Materials and EnergyYunnan UniversityKunming 650091China College of Environmental and Chemical Engineering Metallurgy CollegeKunming 650033China R&D Center Yunnan Yuntianhua Co.LtdKunming 650228China Southwest United Graduate school Kunming 650091China

With its unique 3D skeleton structure and exceptional cyclic stability,the Na^(+)superionic conducto(NASICON)-type Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF)has been con sidered as a competitive cathode material for advanced Na ion ***,the release of fluorine during th heat treatment leads to the formation of an additional phas Na_(3)V_(2)(PO_(4))_(3)(NVP),which results in a low-voltage plateau and compromises the energy ***,we modulat the local electronic states of the V site by aluminum sub stitution to strengthen the stability of *** results confirm that the aluminum introduction not only changes the loca electron states of V sites,significantly reducing the for mation of NVP by-product from 6.71 wt%to 1.01 wt%but also effectively reduces the band gap,improving th electronic conductivity of *** optimized Na_(3)V_(1.9)Al_(0.1)(PO_(4))_(2)F_(3)exhibits higher energy density of 340 Wh·kg^(-1)and excellent rate performance of 106.7 mAh·g^(-1)at 10C compared with the pristine cathode.

关键词： Sodium-ion energy storage batteries Cathode NASICON Doping Electrochemistry

修复长骨大段骨缺损的ZrO_2增韧HA陶瓷研究

在线全文

学校读者我要写书评

暂无评论

武汉理工大学学报 2004年第4期26卷 45-48页

作者：徐卫国陈安民黄传勇付和林孙淑珍华中科技大学同济医学院附属同济医院骨科武汉430030 武汉理工大学材料科学与工程学院武汉430070

研究了用于修复长骨大段骨缺损的 Zr O2 增韧羟基磷灰石复合生物陶瓷。采用 XRD及 SEM测定了材料的矿物组成与显微结构 ,并测试了材料的理化性能。分析了材料的结构和性能并初步确定了较为理想的配方。

关键词：生物陶瓷羟基磷灰石 ZrO2增韧生物相容性

在线全文

学校读者我要写书评

暂无评论

多元统计分析在材料贮存寿命预测中的应用

四川大学学报（工程科学版） 2004年第3期36卷 115-118页

作者：鲁蕾范启胜刘晓石黄雪鹰付敏郭宝星四川大学轻纺学院四川成都610065 吉林白城中国兵器试验中心吉林白城13700 四川大学数学学院四川成都610065

冲击强度是轻武器材料的一个重要参数。为预测材料的贮存寿命,将两类材料进行加速热老化实验,以冲击强度为评判指标,先用方差分析法分析老化因素对冲击强度的显著性,再使用二元回归分析法处理加速老化实验数据,得到二元线性回归方程。... 详细信息

冲击强度是轻武器材料的一个重要参数。为预测材料的贮存寿命,将两类材料进行加速热老化实验,以冲击强度为评判指标,先用方差分析法分析老化因素对冲击强度的显著性,再使用二元回归分析法处理加速老化实验数据,得到二元线性回归方程。经显著性检验,将回归方程用于材料冲击强度的预测和材料失效时间的估计。结果显示,冲击强度对温度和时间是极其敏感的,随着老化时间的延长和老化温度的升高,冲击强度显著降低。

关键词：冲击强度方差分析回归分析老化失效预测

Reductive damage induced autophagy inhibition for tumor therapy

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 5226-5236页

作者： Yuqian Wang Yingjian huang Yu fu zhixiong guo Da Chen Fangxian Cao Qi Ye Qiqi Duan Meng liu Ning Wang Dan Han Chaoyi Qu Zhimin Tian Yongquan Qu Yan Zheng Department of Dermatology the First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061China Key Laboratory of Special functional and Smart Polymer materials of Ministry of Industry and Information technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Dermatology the Second Affiliated HospitalSchool of MedicineXi’an Jiaotong UniversityXi’an 710004China school of Chemical Engineering and technology Shaanxi Key Laboratory of Energy Chemical Process IntensificationXi’an Jiaotong UniversityXi’an 710049China Department of Urology the First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061China Xi’an People’s Hospital(Xi’an Fourth Hospital) Shaanxi Eye HospitalAffiliated Guangren HospitalSchool of MedicineXi’an Jiaotong UniversityXi’an 710004China

Numerous therapeutic anti-tumor strategies have been developed in recent ***,their therapeutic efficacy is reduced by the intrinsic protective autophagy of *** plays a key role in tumorigenesis and tumor treatment,in which the overproduction of reactive oxygen species(ROS)is recognized as the direct cause of protective *** a few molecules have been employed as autophagy inhibitors in tumor therapy to reduce protective *** them,hydroxychloroquine is the most commonly used autophagy inhibitor in clinics,but it is severely limited by its high therapeutic dose,significant toxicity,poor reversal efficacy,and nonspecific ***,we demonstrate a reductive-damage strategy to enable tumor therapy by the inhibition of protective autophagy via the catalytic scavenging of ROS using porous nanorods of ceria(PN-CeO_(2))nanozymes as autophagy *** antineoplastic effects of PN-CeO_(2)were mediated by its high reductive activity for intratumoral ROS degradation,thereby inhibiting protective autophagy and activating apoptosis by suppressing the activities of phosphatidylinositide 3-kinase/protein kinase B and p38 mitogen-activated protein kinase pathways in human cutaneous squamous cell *** investigation highlighted PN-CeO_(2)as a safe and efficient anti-tumor autophagy ***,this study presents a reductive-damage strategy as a promising anti-tumor approach that catalytically inhibits autophagy and activates the intrinsic antioxidant pathways of tumor cells and also shows its potential for the therapy of other autophagy-related diseases.

关键词： CeO_(2) reductive damage autophagy inhibitor tumor therapy reactive oxygen species

Emerging contaminants:A One Health perspective

维普期刊数据库评论

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 2024年第4期5卷 140-170,139页

作者： Fang Wang Leilei Xiang Kelvin Sze-Yin Leung Martin Elsner Ying Zhang Yuming guo Bo Pan Hongwen Sun Taicheng An Guangguo Ying Bryan WBrooks Deyi Hou Damian EHelbling Jianqiang Sun Hao Qiu Timothy MVogel Wei Zhang Yanzheng Gao Myrna JSimpson Yi Luo Scott XChang Guanyong Su Bryan MWong Tzung-May fu Dong Zhu Karl JJobst chengjun Ge Frederic Coulon Jean Damascene Harindintwali Xiankui Zeng Haijun Wang Yuhao fu Zhong Wei Rainer Lohmann Changer Chen Yang Song Concepcion Sanchez-Cid Yu Wang Ali El-Naggar Yiming Yao Yanran huang Japhet Cheuk-fung Law Chenggang Gu Huizhong Shen Yanpeng Gao Chao Qin Hao li Tong Zhang Natàlia Corcoll Min liu Daniel SAlessi Hui li Kristian KBrandt Yolanda Pico Cheng Gu Jianhua guo Jianqiang Su Philippe Corvini Mao Ye Teresa Rocha-Santos Huan He Yi Yang Meiping Tong Weina Zhang Fidèle Suanon Ferdi Brahushi Zhenyu Wang Syed AHashsham Marko Virta Qingbin Yuan Gaofei Jiang Louis A.Tremblay Qingwei Bu Jichun Wu Willie Peijnenburg Edward Topp Xinde Cao Xin Jiang Minghui Zheng Taolin Zhang Yongming Luo lizhong Zhu Xiangdong li DamiàBarceló Jianmin Chen Baoshan Xing Wulf Amelung Zongwei Cai Ravi Naidu Qirong Shen Janusz Pawliszyn Yong-guan Zhu Andreas Schaeffer Matthias C.Rillig Fengchang Wu Gang Yu James M.Tiedje State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China university of Chinese Academy of sciences Beijing 100049China Department of Chemistry Hong Kong Baptist UniversityHong KongChina HKBU Institute of Research and Continuing Education Shenzhen Virtual University ParkShenzhenChina Technical university of Munich TUM School of Natural SciencesInstitute of Hydrochemistry85748 GarchingGermany school of Resources&Environment Northeast Agricultural UniversityHarbin 150030China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVICAustralia Faculty of Environmental science&Engineering Kunming University of Science&TechnologyKunming 650500China Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory of Environmental Theoretical Chemistry South China Normal UniversityGuangzhouGuangdong 510006China Department of Environmental science Baylor UniversityWacoTXUSA Center for Reservoir and Aquatic Systems Research(CRASR) Baylor UniversityWacoTXUSA school of Environment Tsinghua UniversityBeijing 100084China school of Civil and Environmental Engineering Cornell UniversityIthacaNY 14853USA Key Laboratory of Microbial technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of TechnologyHangzhou 310014China school of Environmental science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Laboratoire d’Ecologie Microbienne Universite Claude Bernard Lyon 1UMR CNRS 5557UMR INRAE 1418VetAgro Sup69622 VilleurbanneFrance Department of Pla

Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary *** global efforts to mitigate legacy pollutants,the continuous introduction of new substances remains a major threat to both people and the *** response,global initiatives are focusing on risk assessment and regulation of emerging contaminants,as demonstrated by the ongoing efforts to establish the UN’s Intergovernmental science-Policy Panel on Chemicals,Waste,and Pollution *** review identifies the sources and impacts of emerging contaminants on planetary health,emphasizing the importance of adopting a One Health *** for monitoring and addressing these pollutants are discussed,underscoring the need for robust and socially equitable environmental policies at both regional and international *** actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.

关键词： pollution planet contaminants

Annealed microstructure dependent corrosion behavior of Ti-6Al-3Nb-2Zr-1Mo alloy

维普期刊数据库评论

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 materials science & technology 2021年第3期62卷 234-248页

作者： Baoxian Su liangshun Luo Binbin Wang Yanqing Su liang Wang Robert O.Ritchie Enyu guo Ting li Huimin Yang Haiguang huang Jingjie guo Hengzhi fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Department of materials science and Engineering University of CaliforniaBerkeleyCL 94720USA Key Laboratory of Solidification Control and Digital Preparation technology(liaoning Province) School of Materials Science&EngineeringDalian University of TechnologyDalian116024China Department of materials science and Engineering Dalian Maritime UniversityDalian 116026China school of materials and Chemical Engineering Heilongjiang Institute of TechnologyHarbin 150050China school of materials science and Engineering Kunming University of Science and TechnologyKunming 650093China Yunnan Titanium Industry Co. Ltd.Chuxiong 651209China

Corrosion resistance of titanium(Ti)alloys is closely connected with their microstructure which can be adjusted and controlled via different annealing ***,we systematically investigate the specific effects of annealing on the corrosion performance of Ti-6 Al-3 Nb-2 Zr-1 Mo(Ti80)alloy in 3.5 wt.%NaCl and 5 M HCl solutions,respectively,based on open circuit potential(OCP),potentiodynamic polarization,electrochemical impedance spectroscopy(EIS),static immersion tests and surface *** indicate that increasing annealing tempe rature endows Ti80 alloy with a higher volume fraction ofβphase and finerαphase,which in turn improves its corrosion *** characterization demonstrates thatβphase is more resistant to corrosion thanαphase owing to a higher content of Nb,Mo,and Zr in the former;additionally,the decreased thickness of a phase alleviates segregation of elements to further restrain the micro-galvanic couple effects betweenαandβ***,the influential mechanisms of environmental conditions on corrosion of Ti80 alloy are discussed in *** the formation of a highly compact and stable oxide film on surface,annealed Ti80 alloys exhibit a low corrosion current density(10^(-6)A/cm^(2))and high polarization impedance(10^(6)Ω·cm^(2))in 3.5 wt.%NaCl ***,they suffer severe corrosion in 5 M HCl solution,resulting from the breakdown of native oxide films(the conversion of TiO_(2)to aqueous Ti^(3+)),active dissolution of substrate Ti to aqueous Ti^(3+)and existence of micro-galvanic couple *** findings could provide new insights to designing Ti alloys with high-corrosion resistance through microstructural optimization.

关键词： Titanium alloys Annealing Electrochemical techniques Weight loss Corrosion behavior

Segmented Au/PtCo heterojunction nanowires for efficient formic acid oxidation catalysis

在线全文

学校读者我要写书评

暂无评论

fundamental Research 2021年第4期1卷 453-460页

作者： Yingjun Sun Bolong huang Yingjie li Yingnan Qin Ziqi fu Mingzi Sun Lei Wang Shaojun guo school of materials science and Engineering Peking UniversityBeijing100871China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China Department of Applied Biology and Chemical technology The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong Kong SARChina BIC-ESAT College of EngineeringPeking UniversityBeijing100871China

Exploring a new strategy for the removal of adsorbed CO (CO^(*)) on a Pt surface at a low potential is the key to achieving enhanced catalysis for the formic acid oxidation reaction (FAOR);however, the development of such a strategy remains a significant challenge. Herein, we report a class of Au/PtCo heterojunction nanowires (HNWs) as efficient electrocatalysts for accelerating the FAOR. This heterojunction structure and the induced Co alloying effects can facilitate formic acid adsorption/activation on Pt with high CO tolerance, generating the FAOR pathway from dehydration to dehydrogenation. The optimized Au_(23)/Pt_(63)Co_(14) HNWs showed the highest specific and mass activities of 11.7 mA cm^(−2)Pt and 6.42 A mg^(−1)Pt reported to date, respectively, which are considerably higher than those of commercial Pt/C. DFT calculations confirmed that the electron-rich Au segment enhances the electronic activity of the PtCo NWs, which not only allows the construction of a highly efficient electron transfer channel for the FAOR but also suppresses CO formation.

关键词： Formic acid oxidation reaction Pt-based catalyst Heterojunction structure Nanowires Electrocatalysis