检索结果-南通市图书馆

Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1090-1096页

作者： Tao Lan yi-hui jiang Xiao-jun Zhang Fei Cao Shu-hua Liang Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology Xi’an University of TechnologyXi’an 710048China

Copper matrix composites reinforced by in situ-formed hybrid titanium boride whiskers(TiB_(w))and titanium diboride particles(TiB_(2p))were fabricated by powder *** observations showed competitive precipitation behavior between TiB_(w) and TiB_(2p),where the relative contents of the two reinforcements varied with sintering *** on thermodynamic and kinetic assessments,the precipitation mechanisms of the hybrid reinforcements were discussed,and the formation of both TiB_(w) and TiB_(2p) from the local melting zone was thermodynamically *** precipitation kinetics were mainly controlled by a solid-state diffusion of B *** forming a compact compound layer,in situ reactions were divided into two stages,where Zener growth and Dybkov growth prevailed,***,the competitive precipitation behavior was attributed to the transition of the growth model during the reaction process.

关键词： metal matrix composite hybrid reinforcement in situ reaction growth kinetics

Fabrication and Photoelectrochemical Properties of[Ru(bpy)_2dppz]^(2+) on ITO Electrode Associated with the Oxidation of Guanine

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2010年第4期26卷 649-655页

作者： GUO Qing-yu LI Hong YANG hui-yi SHAO jiang-yang Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities School of Chemistry and Environment South China Normal University Guangzhou 510006 P. R. China

Electrochemical assembly of [Ru（bpy）2dppz]^2＋{bpy=2,2＇-bipyridine, dppz=dipyrido[3,2-a：＂2＇,3＇-c]phenazine} on an ITO electrode in the presence of guanine and photoelectroehemical properties of the assembled layer were investigated. It has been found that [Ru（bpy）2dppz]^3＋/2＋ can be assembled onto the ITO electrode by the method of repetitive voltammetric sweeping, and the assembly is enhanced by guanine. The peak currents of prewaves increase linearly up to a guanine concentration of 0.25 mmol/L. More importantly, upon illumination with 470 nm light source and at an applied potential of 0.2 V, cathodic current for the fabricated layer on the ITO electrode indicate a linear enhancement with the rise of guanine concentration. Meanwhile, [Ru（bpy）2dppz]^2＋ can be served as an excellent mediator to prompt the oxidation of guanine, and the mediated peak current increases linearly with added guanine concentration from 0.01 to 0.25 mmol/L. In addition, the assembly mechanism of [Ru（bpy）2dppz]^2＋ on the ITO electrode associated with the oxidation of guanine and the assistance of light irradiation were discussed.

关键词： Polypyridvl ruthenium(II) complex Guanine ITO Assembly Photoelectrochemistrv

In situ TiB2/Cu composites fabricated by spray deposition using solid-liquid and liquid-liquid reactions

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2020年第7期30卷 1849-1856页

作者： Dan CHEN yi-hui jiang Yu-fa LI Di LIU jiang-tan HE Fei CAO Shu-hua LIANG Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology School of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048China

In situ TiB2/Cu composites were fabricated by both solid-liquid(S-L)and liquid-liquid(L-L)reactive spray deposition in combination with cold rolling and *** microstructure and properties of the fabricated TiB2/Cu composites were *** results show that the reactive mode and rolling treatment are the main factors affecting the microstructure and properties of the TiB2/Cu *** in situ reaction in the L-L reaction can be carried out more *** controlling the rolling and annealing process,the relative density and the properties of the as-deposited composites are *** comprehensive performance of the deformed TiB2/Cu composite prepared by L-L reactive spray deposition(401 MPa and 83.5%IACS)is better than that by S-L reactive spray deposition(520 MPa and 20.2%IACS).

关键词： in situ TiB2/Cu composite reactive spray deposition electrical conductivity tensile strength

Ca^(2+)在饮用水铜绿微囊藻控制中的应用

在线全文

学校读者我要写书评

暂无评论

中国环境科学 2021年第11期41卷 5187-5193页

作者：易晋聂小保王奕睿肖辉毅隆院男蒋昌波长沙理工大学水利与环境工程学院湖南长沙410114 洞庭湖水环境治理与生态修复湖南省重点实验室湖南长沙410114 湖南省环境保护河湖疏浚污染控制工程技术中心湖南长沙410114

为改善饮用水藻类的混凝去除效果,以铜绿微囊藻为研究对象,考察了单独投加Ca^(2+)、Ca^(2+)与PAC联用、Ca^(2+)与CO_(3)~(2-)原位结晶三种方法的除藻效果,并对Ca^(2+)和结晶产物CaCO_(3)的除藻机制进行探讨.结果表明,单独采用Ca^(2+)时,... 详细信息

为改善饮用水藻类的混凝去除效果,以铜绿微囊藻为研究对象,考察了单独投加Ca^(2+)、Ca^(2+)与PAC联用、Ca^(2+)与CO_(3)~(2-)原位结晶三种方法的除藻效果,并对Ca^(2+)和结晶产物CaCO_(3)的除藻机制进行探讨.结果表明,单独采用Ca^(2+)时,Ca^(2+)在低浓度下对藻细胞具有吸附电中和作用,高浓度时同时还有架桥作用,但两者均无法实现对铜绿微囊藻的去除.Ca^(2+)与PAC联用,Ca^(2+)可以通过吸附电中和显著提高PAC的除藻效果,最大去除率可达98.0%,同时Ca^(2+)与溶解性藻源有机物(dAOM)的络合可将残余铝降低50%以上.含藻水中原位CaCO_(3)结晶对铜绿微囊藻的去除率最高可达83.5%,其产物为带正电荷、粒径2~4μm左右的球型球霰石.球霰石对藻细胞的去除机制包括球霰石与藻细胞的互絮凝,以及球霰石团聚物对藻细胞的卷扫絮凝,同时球霰石还可以作为加重剂促进藻晶产物沉降分离.自来水厂采用CaCO_(3)原位结晶与PAC联用除藻,可望降低PAC投加量和残余铝风险,并解决CaCO_(3)原位结晶导致的浊度和pH偏高问题.研究成果为饮用水除藻提供了新思路.

关键词： Ca^(2+) 铜绿微囊藻饮用水 CaCO_(3)原位结晶电中和

Ideal Bi‑Based Hybrid Anode Material for Ultrafast Charging of Sodium‑Ion Batteries at Extremely Low Temperatures

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 152-167页

作者： Jie Bai Jian hui Jia Yu Wang Chun Cheng Yang Qing jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022People’s Republic of China

Sodium-ion batteries have emerged as competitive substitutes for low-temperature applications due to severe capacity loss and safety concerns of lithium-ion batteries at−20°C or ***,the key capability of ultrafast charging at ultralow temperature for SIBs is rarely ***,a hybrid of Bi nanoparticles embedded in carbon nanorods is demonstrated as an ideal material to address this issue,which is synthesized via a high temperature shock *** a hybrid shows an unprecedented rate performance(237.9 mAh g^(−1)at 2 A g^(−1))at−60℃,outperforming all reported SIB anode *** with a Na_(3)V_(2)(PO_(4))_(3)cathode,the energy density of the full cell can reach to 181.9 Wh kg^(−1)at−40°*** on this work,a novel strategy of high-rate activation is proposed to enhance performances of Bi-based materials in cryogenic conditions by creating new active sites for interfacial reaction under large current.

关键词： Bi nanoparticles High temperature shock High-rate activation Ultrafast charging Low-temperature sodium-ion batteries

Magnetic-Coupling Based Waveguide-to-Microstrip Transition

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2011年第2期9卷 185-189页

作者： Jun Xu Zhi-Tao Xu Mao-Yan Wang Chun-Rong Zheng yi Wang Li-hui jiang School of Physical Electronics University of Electronic Science and Technology of ChinaChengdu 610054China

A novel millimeter-wave waveguide-to-microstrip transition based on magnetic-coupling is presented in this *** mode conversion of electromagnetic field is realized with the ring strip line of arbitrary shape in the E-plane of rectangular waveguide and the eccentric quasi-coaxial line,which is partially filled with media and consists of outer and inner rectangular *** structure has the advantages of low loss,wide bandwidth,compact structure,and avoiding *** 27 GHz to 40 GHz,the experiment results show that the insertion loss is less than 1.2 dB and the return loss is better than 13.5 dB for the back-to-back transition with semicircle ring strip lines.

关键词： Magnetic coupling mircostrip line transition rectangular waveguide

CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 522-532页

作者： Jin-Peng Wang Guo-Cui Mao hui-Lin jiang Bao-Xia Dong Yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

关键词： CO 2 methanation Metal hydride Ni catalysts Carbonate Metal-carbonate interface

Cloning and characterization of a novel gene (C17orf25) from the deletion region on chromosome 17p13.3 in hepatocelular carcinoma

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Cell Research 2001年第3期11卷 209-216页

作者： QIN WEN XIN, DA FANG WAN, FEN YONG SUN, PING PING ZHANG, LI WEI HAN, yi HUANG, hui QIU jiang, XIN TAI ZHAO, MEI HE. YUN YE, WEN MING CONG, MENG CHAO WU, LI SHENG ZHANG, NAN WU YANG, JIAN REN GU National LaBoratory for Oncogenes and Related Gencs, Shanghai National Laboratory for Oncogenes and Related Genes Shanghai Cancer Institute Shanghai China Shanghai GeneCore Biotechnologies Shanghai China Eastern Hepatobiliary Surgery Hospital Second Military Medical University Shanghai China Cancer Hospital Guangxi Medical University Nanning China

Using a combination of hybridization of PAC to a cDNA library and RACE technique, we isolated a novel cDNA, designated as C17orf25 (Chromosome 17 open rea(ling frame 25, previously named it HC71A), from the deletion region on chromosome 17p13.3. The cDNA encodes a protein of 313 amino acids with a calculated molecular mass of 34.8 kDa. C17orf25 is divided into 10 exons and 9 introns, spanning 23 kb of genomic DNA. Northern blot analysis showed that the mRNA expression of C17orf25 was decreased in hepatocellular carcinoma samples as compared to adjacent noncancerous liver tissues from the same patients. The transfection of C17or25 into the hepatocellular carcinoma cell SMMC7721 and overexpression could inhibit the cell growth. The above results indicate that C17orf25 is a novel human gene, and the cloning and preliminary characterization of C17orf25 is a prerequisite for further functional analysis of this novel gene in human hepatocellular carcinoma.

关键词： Chromosome 17p13.3 1lss of heterozygosity hepatocellular carcinoma transfection novel human gene (C17orf25)

Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第1期17卷 205-215页

作者： Cong Geng Kuanxiang Zhang Changhua Wang Chung Hsien Wu Jiwen jiang Fei Long Liyuan Han Qifeng Han yi‑Bing Cheng Yong Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials Co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been considered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of commercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve coverage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the incompletely passivated trap states caused interface recombination.A surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power conversion efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation underscores the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface recombination