检索结果-南通市图书馆

Journal of Energy Chemistry 2024年第8期95卷 644-650,I0014页

作者： yang-yang Wang Ya-Nan Wang Nan Yao Shu-Yu Sun Xiao-Qing Ding Chen-Xi Bi Qian-kui Zhang Zhao Zheng Cheng-Bin Jin Bo-quan Li Xue-Qiang Zhang Jia-Qi Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China College of Materials and Chemistry China Jiliang UniversityHangzhou 310018ZhejiangChina

Lithium(Li)metal is regarded as a promising anode candidate for high-energy-density rechargeable ***,Li metal is highly reactive against electrolytes,leading to rapid decay of active Li metal ***,alloying Li metal with low-content magnesium(Mg)is proposed to mitigate the reaction kinetics between Li metal anodes and *** atoms enter the lattice of Li atoms,forming solid solution due to the low amount(5 wt%)of *** atoms mainly concentrate near the surface of Mg-alloyed Li metal *** reactivity of Mg-alloyed Li metal is mitigated kinetically,which results from the electron transfer from Li to Mg atoms due to the electronegativity *** on quantitative experimental analysis,the consumption rate of active Li and electrolytes is decreased by using Mgalloyed Li metal anodes,which increases the cycle life of Li metal batteries under demanding ***,a pouch cell(1.25 Ah)with Mg-alloyed Li metal anodes delivers an energy density of 340 Wh kg^(-1)and a cycle life of 100 *** work inspires the strategy of modifying Li metal anodes to kinetically mitigate the side reactions with electrolytes.

关键词： Lithium metal anodes Alloying Anode/electrolyte interface Reaction kinetics Pouch cell

Thermal fatigue behavior of K125L superalloy

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2016年第2期35卷 172-176页

作者： Li-kui Ning Zhi Zheng Feng-quan An Song Tang Jian Tong Hui-Si Ji Hui-Wen Yu Institute of Metal Research Chinese Academy of Sciences Material Preparation Company Northern Heavy Industries Group Co. Ltd.

The thermal fatigue behavior of K125 L superalloy at the peak temperature of 1,050 °C was investigated by optical microscope（OM）, X-ray diffraction（XRD）, and scanning electron microscope（SEM）. The experimental results show that the crack initiation sites of tested alloys are at the V-notch tip and the V-notch tip propagates by way of continuous cracking along grain boundaries. The formation of high-temperature oxides and MC carbides accelerates the crack propagation, and no secondary carbides precipitate out. Oxides between cracks are mainly the Al2O3 as well as Cr_2O_3, and carbides are Ta-rich and Tirich MC carbides.

关键词： K125L superalloy Thermal fatigue High temperature oxidation Carbides

Synthesis and photophysical properties of metal anthraquinone phthalocyanine

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第5期18卷 509-512页

作者： Yi Ru Peng kui Zhi Chen Jia Bao Wen Ji Cheng Shi Bao quan Huang College of Chemistry ＆ Materials Science Fujian Normal University Fuzhou 350007 China Stute Key Laboratory for Structure Chemistry Chinese Academy of Science Fuzhou 350003 China

A novel anthraquinone phthalocyanine AI（Ⅲ） 4 and Co（Ⅱ） 5 were synthesized and characterized by elemental analysis, IR UV/ vis, ^1H NMlL HPLC and MS. The photophysical properties of the two metal complexes were s... 详细信息

关键词： Anthraquinone phthalocyanine Al(Ⅲ) and Co(Ⅱ) Synthesis Characterization Photophysical properties

Stable Operation of the 2 K Cryogenic System for the Superconducting Accelerator at Peking University

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第8期30卷 34-37页

作者： LIN Lin HAO Jian-kui XIE Hua-Mu quan Sheng-Wen WEN Xiao-Dong ZHAO kui LIU Ke-Xin State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871

A superconducting energy recovery linac test facility(PKU-SETF)was built at Peking University,and a 2 K cryogenic system,which is the first closed-loop 2 K cryogenic system for a superconducting accelerator in China,was constructed for the 1.3 GHz 3+1/2 cell dc-SRF *** main accelerator consists of two nine-cell TESLA-type superconducting cavities of the *** commissioning and stable operation of this 2 K cryogenic system was carried out.A helium pressure stability of better than±0.1 mbar and a total refrigeration capacity of 65 W at a temperature of 2 K was reached.

关键词： system Peking accelerator

Regulating the electrolyte solvation structure by weakening the solvating power of solvents for stable lithium metal batteries

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第12期66卷 3620-3627页

作者： Jia-Lin Liang Shu-Yu Sun Nan Yao Zhao Zheng Qian-kui Zhang Bo-quan Li Xue-Qiang Zhang Jia-Qi Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Department of Chemical Engineering Tsinghua UniversityBeijing 100081China

Rational electrolyte design is essential for stabilizing high-energy-density lithium(Li)metal batteries but is plagued by poor understanding on the effect of electrolyte component properties on solvation structure and interfacial ***,regulating the solvation structure in localized high-concentration electrolytes(LHCE)by weakening the solvating power of solvents is proposed for high-performance LHCE.1,3-dimethoxypropane(DMP)solvent has relatively weak solvating power but maintains the high solubility of Li salts,thus impelling the formation of nanometric aggregates where an anion coordinates to more than two Li-ions(referred to AGG-n)in *** decomposition of AGG-n increases the Li F content in solid electrolyte interphase(SEI),further enabling uniform Li *** cycle life of Li metal batteries with DMP-based LHCE is 2.1 times(386 cycles)as that of advanced ether-based LHCE under demanding ***,a Li metal pouch cell of 462Wh kg^(-1)undergoes 58 cycles with the DMP-based LHCE *** work inspires ingenious solvating power regulation to design high-performance electrolytes for practical Li metal batteries.

关键词： lithium metal anodes solvation structure 1,3-dimethoxypropane nanometric aggregates pouch cells

Achieving high carrier mobility and low lattice thermal conductivity in GeTe-based alloys by cationic/anionic co-doping

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第6期43卷 2784-2795页

作者： Xiao-Qiang Wang Xiao-quan Hu Jun-Yan Lin Chu-Bin Li Xiao-Tong Yu Qi-Yong Chen Li-Li Xi Qi-Shuo yang Han Li Ji-Ye Zhang Shuan-kui Li Kai Guo School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China Research Center for Advanced Information Materials(CAIM) Huangpu Research&Graduate School of Guangzhou UniversitySino-Singapore Guangzhou Knowledge CityGuangzhou510555China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Materials Genome Institute Shanghai UniversityShanghai 200444China School of Mechanical and Mining Engineering University of QueenslandBrisbaneQLD 4072Australia Key Laboratory of Si-Based Information Materials&Devices and Integrated Circuits Design Department of Education of Guangdong ProvinceGuangzhou 510006China

TheⅣ-Ⅵcompound GeTe is considered as a promising alternative to the toxic PbTe for high-efficiency mid-temperature thermoelectric ***,pristine GeTe suffers from a high concentration of Ge vacancies,resulting in an excessively high hole concentration(>1×10^(21)cm^(-3)),which greatly limits its thermoelectric *** address this issue,CuBiTe_(2)alloying is introduced to increase the formation energy of Ge vacancies in GeTe,thereby inhibiting the high carrier *** carrier scattering caused by the electronegativity difference between different elements is suppressed due to the similar electronegativity of Cu and Ge atoms.A relatively high hole mobility is obtained,which ultimately leads to a high power ***,by introducing Se as an alloying element at the anionic site in GeTe,dense point defects with mass/strainfield fluctuations are *** contributes to the strengthening of phonon scattering,thereby reducing the lattice thermal conductivity from 1.44 W·m^(-1)·K^(-1)for pristine GeTe to 0.28 W·m^(-1)·K^(-1)for Ge_(0.95)Cu_(0.05)Bi_(0.05)Te_(0.9)Se_(0.15)compound at 623 K.

关键词： GeTe Carrier mobility CuBiTe_(2)alloying Lattice thermal conductivity Thermoelectric properties

Corrosion behaviors for peak-aged Mg-7Gd-5Y-lNd-0.5Zr alloys with oxide films

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2016年第10期35卷 758-762页

作者： quan-Tong Jiang kui Zhang Xing-Gang Li Yong-Jun Li Ming-Long Ma Guo-Liang Shi Jia-Wei Yuan State Key Laboratory for Nonferrous Metals and Process General Research Institute for Nonferrous MetalsBeijing 100088China

The corrosion behaviors of T5 （225 ℃, 6.5 h） and T6 （460 ℃, 2 h ＋ 225 ℃, 12 h） peak-aged Mg-7Gd- 5Y-1Nd-0.5Zr alloys with oxide films were investigated by optical microscope （OM）, scanning electron microscopy （SEM）, and energy-dispersive spectroscopy （EDS）. The weight loss rates and electrochemical tests were also analyzed. The thicknesses of T5 and T6 oxide films are roughly 0.6 and 1.0 μm, respectively. The components of oxide films mainly consist of O, Mg, Y, Nd, and Gd, and the T6 oxide film results in surfaces with larger peaks than T5 oxide film. In addition, Y, Nd, and Gd peaks are all higher than those of Mg-7Gd-5Y- 1Nd-0.5Zr alloys, but Mg peak is consistently far below than that of the alloys. The specimens could be arranged in de- creasing order of corrosion rates and corrosion current densi- ties： T6 oxide film 〈 T5 oxide film 〈 T6 without oxide film 〈 T5 without oxide film. The oxide films are compact to increase the corrosion resistance for Mg-7Gd-5Y-1Nd-0.5Zr alloys, which will provide a guiding insight into the corrosion and protection of Mg-RE alloys in atmospheric environments.

关键词： Mg-7Gd-5Y-1Nd-0.5Zr alloys Peak-aged Oxide film Corrosion behavior

Collapses-revivals phenomena induced by weak magnetic flux in diamond chain

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第1期29卷 148-155页

作者： Na-Na Chang Wen-quan Jing Yu Zhang Ai-Xia Zhang Ju-kui Xue Su-Peng Kou Department of Physics Beijing Normal UniversityBeijing 100875China College of Physics and Electronics Engineering Northwest Normal UniversityLanzhou 730070China

We investigate the quantum dynamical behaviors of bosons in a diamond chain with weak magnetic flux(WMF),including Landau–Zener tunnelling,Bloch oscillations,localization phenomenon,and collapses-revivals *** observed that collapses-revivals phenomena can occur in diamond chain with WMF and cannot exist in the strong magnetic flux case as the previous study(Chang N N and Xue J K,2018,***.B 27105203).Induced by WMF,the energy band for the system varies from gapless to gapped *** position of the extrema of probability amplitude for ground state can also be altered by WMF within a single diamond *** a consequence,the transitions between different dynamical behaviors of bosons in diamond chain can be manipulated by WMF,depending on its initial configurations.

关键词： collapses-revivals phenomena Bloch oscillations Landau–Zener tunneling localization phenomenon flat band

Impact of land expropriation on farmers’ livelihoods in the mountainous and hilly regions of Sichuan, China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2019年第11期16卷 2484-2501页

作者： GUO Shi-li LI Chun-jie WEI Ya-li ZHOU kui LIU Shao-quan XU Ding-de LI Qian-yu China Western Economic Research Center Southwestern University of Finance and EconomicsChengdu 610074China College of Environmental Science and Tourism Nanyang Normal UniversityNanyang 473061China College of Resources Sichuan Agricultural UniversityChengdu 611130China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China Sichuan Center for Rural Development Research College of Management of Sichuan Agricultural UniversityChengdu 611130China

Research on the sustainable livelihoods of rural households is of great significance to mitigating rural poverty and reasonable land expropriation policy helps to realize better livelihoods and sustainable *** have conducted considerable research on the relationships between land expropriation and farmers'***,few quantitative studies have used the characteristics of villages as control variables to systematically analyze the impact of land expropriation on farmers'livelihood capital and strategy in the mountainous and hilly regions of *** study uses the Partial Least Squares-Structural Equation Model(PLS-SEM)to systematically explain the impact of land expropriation on farmers'livelihoods in mountainous and hilly regions of Sichuan in 2013,with the characteristics of the village including income,accessibility and terrain as control *** analysis uses both representative sample data of 240 rural households and spatial data calculated using a 30 m Digital Elevation Model(DEM)by Geographic Information System(GIS).Results are as follows:(1)The land expropriation characteristicsare negatively affected by village *** with worse accessibility tend to have fewer land parcels and less land area ***,land that is expropriated from inaccessible villages tends to receive less compensation.(2)Natural capital is negatively affected by number and area of land *** capital is not only directly affected by village accessibility,but also indirectly affected by village accessibility through the mediating effect of the number and area of land parcels expropriated.(3)Physical capital is positively affected by compensation for land expropriation,and negatively affected by village accessibility through compensation for land *** worse a village's accessibility/location is,the less compensation it will receive for land expropriation,resulting in lower physical capital.(4)F

关键词： Sustainable livelihoods Land expropriation Partial least squares-structural equation model Mediating effects Mountainous regions

Effect of ^(125)I seeds and ^(103)Pd stents on proliferation of vascular smooth muscle cells

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2002年第4期13卷 218-223页

作者： ZHU Jun, LUO quan-Yong, ZHU Rui-Sen, LU Han-kui (Shanghai 6th People’s Hospital, Shanghai 200233) Shanghai 6th People's Hospital 200233

This study aims at the theoretical and practical evidence for prevention of restenosis in *** smooth muscle cell(VSMC)model was established using adherent cell culture *** proliferation of VSMC was investigated by the cell counting method and 3H-TDR implementation *** results are as follows.(1) For ^125I-seeds,the inhibition rate was 29.3% at 74B1(P<0.05),35.2% at 148Bq(P<0.05)and 42.4% at 370Bq(P<0.05),For ^103Pd-implanted stents,the inhibition rate was 14.7% at 4.44MBq(P<0.05),24.0% at 5.92MBq(P<0.05) and 38.0%at 7.4MBq(p<0.05),There was no significant difference between the blank tests and non-radioactive tests.(2) 48 hours exposure from ^125I-seeds at 148Bq or ^103Pd-implanted stents at 7.4MBq did not result in VSMC's morphological alteration,but that from ^125I-seeds at 370Bq caused morphological changes,Both ^125I-seeds and ^103Pd0-implanted stents inhibit the VSMC DNA synthesis in *** inhibition effects are significantly related to their exposure duration and doses.

关键词：细胞增殖 125I 103Pd 血管肌肉细胞