检索结果-南通市图书馆

Influence of microwave treatment on grinding and dissociation characteristics of vanadium titano-magnetite

International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 160-167页

作者： Jun-peng Wang Tao Jiang Ya-jing Liu Xiang-xin Xue School of Metallurgy Northeastern University key laboratory of liaoning province for Recycling Science of Metallurgical Resources

The effect of microwave treatment on the grinding and dissociation characteristics of vanadium titano-magnetite(VTM) ore were investigated using scanning electron microscopy(SEM), nitrogen absorption measurements, particle size distribution measurements, X-ray diffraction(XRD) analysis, Fourier transform infrared(FT-IR) spectroscopic analysis, and magnetic separation. SEM analysis showed that microfractures appeared in the microwave-treated VTM, which is attributed to the microwaves' selective heating characteristic and the differential expansion between minerals and gangues. Nitrogen absorption showed that the microfractures were more pronounced when the microwave heating time was increased. Particle size distribution analysis showed that microwave treatment could improve the grindability of the VTM, thus increasing the weight percent of the fine-ground product. The increase in grindability was more significant with prolonged heating time. Moreover, the particle size distribution of the fine-ground product changed only slightly after the microwave treatment. XRD analysis showed that the crystallinity of the microwave-treated VTM increased with increasing microwave heating time. The magnetic separation tests revealed that the separation efficiency increased as a result of the intergranular fractures generated by microwave treatment. The Fe grade of the magnetic fraction of microwave-treated VTM was 1.72% higher than that of the raw ore. We concluded that the microwave treatment was beneficial, especially for the mineral processing characteristics.

关键词： microwave treatment vanadium titano-magnetite grinding microstructure magnetic separation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Macro Meso Response and Stress Wave Propagation Characteristics of MCT High-Voltage Switch Under Shock load

引用

Defence Technology（防务技术） 2024年第2期32卷 317-335页

作者： Yuyang Guo Chuang Chen Ruizhi Wang Enling Tang key laboratory of Transient Physical Mechanics and Energy Conversion Materials of liaoning province Shenyang Ligong UniversityShenyang110159LiaoningChina

In order to study the dynamic and electrical coupling response characteristics of Metal Oxide Semiconductor Controlled Thyristor(MCT)high-voltage switch under the synergic action of mechanical load and high voltage,the separated Hopkinson pressure bar(SHPB)test system was used to simulate different impact load environments,and combined with the multi-layer high-voltage ceramic capacitor charging and discharging system,the instantaneous electrical signals of MCT high-voltage switch were *** with numerical simulation and theoretical analysis,the failure mode and stress wave propagation characteristics of MCT high voltage switch were *** mechanical and electrical coupling response characteristics and failure mechanism of MCT high voltage switch under dynamic load were revealed from macroscopic and microscopic *** results show that the damage modes of MCT high-voltage switches can be divided into non-functional damage,recoverable functional damage,non-recoverable damage and structural *** to the gap between the metal gate and the oxide layer,the insulating oxide layer was *** placing for a period of time,the elastic deformation of the metal gate partially recovered and the accumulated charge disappeared,which induced the recoverable functional damage failure of the *** addition,obvious cracks appeared on both sides of the monocrystalline silicon inside the MCT high-voltage switch,leading to unrecoverable damage of the device.

关键词： MCT Impact load Failure analysis Stress wave Numerical simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and luminescent properties of terbium complex with 2-amino-4-chlorobenzoic acid

引用

Journal of Rare Earths 2016年第3期34卷 240-244页

作者：陈永杰邢贞方曹爽王莹 key laboratory of Rare Earth Chemistry and Application of liaoning province Shenyang University of Chemical Technology

A novel complex [Tb（L）_2（H_2O）_3·H_2O]（where L=2-amino-4-chlorobenzoic acid） was synthesized and characterized by a series of analysis. The molecular formula of complex was confirmed by Fourier transform infrared（FT-IR） spectroscopy and thermogravimetric/differential thermogravimetric（TG-DTG） measurements. The optical properties of complex was measured by ultraviolet spectroscopy（UV） and fluorescence spectroscopy（FS）. The results indicated that Tb^（3＋） in the complex was coordinated by ligand, and the complex emitted bright yellow-green luminescence with main peak at 548.8 nm with excitation at 369.4 nm.

关键词： rare earth complex 2-amino-4-chlorobenzoic acid solvothermal synthesis luminescent properties rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nonlinear Dynamics of an Axially Moving Plate Submerged in Fluid with Parametric and Forced Excitation

引用

Acta Mechanica Solida Sinica 2024年第5期37卷 727-735页

作者： Hongying Li Yijiao Xu Wenqi Zhang Jian Li key laboratory of Structural Dynamics of liaoning province College of SciencesNortheastern UniversityShenyang110819China

In this study,analytical and numerical methods are applied to investigate the dynamic response of an axially moving plate subjected to parametric and forced *** on the classical thin plate theory,the governing equation of the plate coupled with fluid is established and further discretized through the Galerkin *** equations are solved using the method of multiple scales to obtain amplitude-frequency curves and phase-frequency *** stability of steady-state response is examined using Lyapunov’s stability *** addition,numerical analysis is employed to validate the results of analytical solutions based on the Runge-Kutta *** multi-value and stability of periodic solutions are verified through stable periodic *** parametric studies show that proper selection of system parameters enables the system to stay in primary resonance or simultaneous resonance,and the state of the system can switch among different periodic motions,contributing to the optimization of fluid-structure interaction system.

关键词： Axially moving plate Method of multiple scales Simultaneous resonances Stability

来源：

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

A semi-immobilized sulfur-rich copolymer backbone with conciliatory polymer skeleton and conductive substrates for high-performance Li-S batteries

引用

Journal of Energy Chemistry 2023年第6期81卷 510-518,I0012页

作者： Tianpeng Zhang Zihui Song Jinfeng Zhang Wanyuan Jiang Runyue Mao Borui Li Siyang Liu Xigao Jian Fangyuan Hu School of Materials Science and Engineering State Key Laboratory of Fine ChemicalsFrontiers Science Center for Smart Materials Oriented Chemical EngineeringTechnology Innovation Center of High Performance Resin Materials(Liaoning Province)Key Laboratory of Energy Materials and Devices(Liaoning Province)Dalian University of TechnologyDalian 116024LiaoningChina School of Chemical Engineering State Key Laboratory of Fine ChemicalsFrontiers Science Center for Smart Materials Oriented Chemical EngineeringTechnology Innovation Center of High Performance Resin Materials(Liaoning Province)Key Laboratory of Energy Materials and Devices(Liaoning Province)Dalian University of TechnologyDalian 116024LiaoningChina

Sulfur-rich polymers have gained a great deal of attention as the next-generation active materials in lithium-sulfur(Li-S)batteries due to their low cost,environmental compatibility,naturally sulfur uniform dispersion,and distinctive structure covalently bonding with sulfur ***,the poor electrical conductivity and undesirable additional shuttle effect still hinder the commercial application of sulfur-rich ***,we report a flexible semi-immobilization strategy to prepare allylterminated hyperbranched poly(ethyleneimine)-functionalized reduced graphene oxide(A-PEI-EGO)as sulfur-rich copolymer *** semi-immobilization strategy can effectively reconcile the demand for polymer skeleton and conductive substrates through forming quaternary ammonium groups and reducing oxygen-containing functional groups,resulting in enhanced skeleton adsorption capacity and substrate electronic conductivity,***,the stable covalent bonding connection based on polymer molecules(A-PEI)not only completely prevents the additional shuttle effect of lithiation organic molecules and even sulfur-rich oligomers,but provides more inverse vulcanization active *** a result,the as-prepared A-PEI-EGO-S cathodes display an initial discharge capacity of1338 m A h g^(-1)at a rate of 0.1 C and an outstanding cycling stability of 0.046%capacity decay per cycle over 600 *** under 6.2 mg cm^(-2)S-loaded and sparing electrolyte of 6μL mg^(-1),the A-PEI-EGO-S cathode can also achieve a superior cycling performance of 98%capacity retention after 60 cycles,confirming its application potential.

关键词： Li-S batteries Sulfur-rich polymers Semi-immobilization strategy Demand reconciliation Outstanding cycling stability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A flexible design strategy to modify Ti3C2Tx MXene surface terminations via nucleophilic substitution for long-life Li-S batteries

引用

Journal of Energy Chemistry 2022年第11期31卷 349-358,I0010页

作者： Tianpeng Zhang Wenlong Shao Siyang Liu Zihui Song Runyue Mao Xin Jin Xigao Jian Fangyuan Hu School of Materials Science and Engineering State Key Laboratory of Fine ChemicalsKey Laboratory of Energy Materials and Devices(Liaoning Province)Dalian University of TechnologyDalian 116024LiaoningChina State key laboratory of Fine Chemicals Department of Polymer Science&MaterialsLiaoning Province Engineering Research Centre of High Performances ResinsDalian University of TechnologyDalian 116024LiaoningChina

MXene-based materials have gained considerable attention for lithium-sulfur(Li-S)batteries cathode materials due to their superior electric conductivity and high affinitive to ***,there are still challenges in modifying the surface functional groups of MXene to further improve the electrochemical performance and increase the structure variety for MXene-based sulfur ***,we report an efficient and flexible nucleophilic substitution(S_(N))strategy to modify the Ti_(3)C_(2)T_(x) surface terminations and purposefully designed Magnolol-modified Ti_(3)C_(2)T_(x)(M-Ti_(3)C_(2)T_(x))as powerful cathode host *** from more C-Ti-O bonds forming and diallyl groups terminations reducing after the dehalogenation and nucleophilic addition reactions,the given M-Ti_(3)C_(2)T_(x) electrode could effectively suppress the lithium polysulfides shuttling via chemisorption and C—S covalent bond ***,the Magnolol-modified Ti_(3)C_(2)T_(x) significantly accelerates polysulfide redox reaction and reduces the activation energy of Li_(2) S *** a result,the as-prepared M-Ti_(3)C_(2)T_(x) electrode displays an excellent rate capability and a high reversible capacity of 7.68 mAh cm^(-2)even under 7.2 mg cm^(-2)S-loaded with a low decay rate of 0.07%(from 2 nd cycle).This flexible surface-modified strategy for MXene terminations is expected to be extended to other diverse MXene applications.

关键词： Lithium-sulfur batteries Nucleophilic substitution Magnolol-modified Ti3C2Tx Multifunctional sulfur host Long-cycle life

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Plasma preparation of highly reactive Ag-Cu NPs anchored in N-PC as catalysts for Aluminum-air battery

引用

Journal of Energy Chemistry 2023年第11期86卷 217-226,I0005页

作者： Jie Wang Aimin Wu Lei Xing Shuai Ran Wenhua Yu Xufeng Dong Hao Huang key laboratory of Energy Materials and Devices(liaoning province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina

Efficient,stable and economical catalysts play a crucial role in enhancing the kinetics of slow oxygen reduction reactions(ORR)in Aluminum-air *** the potential next-generation candidates,Ag catalysts are promising due to their high activity and low cost,but weaker oxygen adsorption has hindered *** address this bottleneck,Ag-alloying has emerged as a principal *** this work,we successfully prepared Ag-Cu nanoparticles(NPs)with a rich eutectic phase and uniform dispersion structure using plasma *** increased solid solution of Ag and Cu led to changes in the electronic structure,resulting in an upward shift of the d-band center,which significantly improved oxygen *** combination of Ag and Cu in the NPs synergistically enhanced the adsorption of Ag and the desorption of *** functional theory(DFT)calculations revealed that Ag-Cu25 NPs exhibited the smallest limiting reaction barrier,leading to increased ORR *** further optimize the catalyst’s performance,we utilized N-doped porous nanocarbon(N-PC)with high electrical conductivity and abundant mesoporous channels as the support for the Ag-Cu *** N-PC support provided optimal mass transfer carriers for the highly active Ag-Cu25 *** a result,the Ag-Cu25/NPC catalyst displayed excellent ORR activity in alkaline media,with a half-wave potential(E_(1/2))of 0.82 ***,the Al-air battery incorporating the Ag-Cu25/NPC catalyst exhibited outstanding electrochemical *** demonstrated high open-circuit voltages of 1.89 V and remarkable power densities of 193 m W cm^(-2).The battery also sustained a high current output and maintained a stable high voltage for 120 hours under mechanical charging,showcasing its significant potential for practical applications.

关键词： Aluminum-air battery Catalyst Ag-Cu nanoparticles Eutectic Nitrogen-doped Oxygen reduction reaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of mild intrauterine hypoperfusion in the second trimester on memory and learning function in rat offspring

引用

Neural Regeneration Research 2020年第11期15卷 2082-2088页

作者： Shao-Wei Yin Yuan Wang Yi-Lin Meng Cai-Xia Liu Department of Gynecology and Obstetrics Shengjing Hospital of China Medical UniversityShenyangLiaoning ProvinceChina key laboratory of Maternal-Fetal Medicine of liaoning province ShenyangLiaoning ProvinceChina Department of Anesthesiology Shengjing Hospital of China Medical UniversityShenyangLiaoning ProvinceChina

Mild intrauterine hypoperfusion(MIUH)is a serious pathological event that affects the growth and development of fetuses and *** can lead to growth restriction,low birth weight,neurodevelopmental disorders,and other adverse clinical *** study the effects of MIUH on learning and memory function in offspring,a model of MIUH was established by placing a coil(length 2.5 mm,diameter 0.24 mm)on the uterine artery and ovarian uterine artery of Sprague-Dawley rats in the second trimester of pregnancy(day 17).Next,120 mg/kg lithium chloride(the MIUH+Li group)or normal saline(the MIUH group)was injected intraperitoneally into these *** addition,120 mg/kg lithium chloride(the Li group)or normal saline(the SHAM group)was injected intraperitoneally into pregnant rats without coil *** Morris water maze was used to detect changes in learning and memory ability in the offspring at 4 weeks after *** the MIUH group,the escape latency and journey length before reaching the platform were both increased,and the number of times that the platform was crossed and the activity time in the target quadrant within 90 seconds were both decreased compared with the SHAM *** double staining and western blot assays demonstrated that hippocampal nestin and Ki67(both cell-proliferation-related proteins)expression was significantly downregulated in the MIUH group compared with the SHAM ***,western blot assays were conducted to investigate changes in related signaling pathway proteins in the brains of offspring rats,and revealed that glycogen synthase kinase 3β(GSK3β)expression was upregulated andβ-catenin expression was downregulated in the MIUH group compared with the SHAM *** addition,compared with the MIUH group,the expression levels of p-GSK3βandβ-catenin were upregulated in the MIUH+Li *** results suggest that MIUH may affect learning and memory function in rat offspring by regulating the GSK3βsignaling pathway.T

关键词： developmental neurobiology glycogen synthase kinase 3 intrauterine learning lithium memory offspring placenta diseases signal pathways β-catenin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Carbon spheres with rational designed surface and secondary particle-piled structures for fast and stable sodium storage

引用

Journal of Energy Chemistry 2021年第3期30卷 368-376页

作者： Wenlong Shao Fangyuan Hu Siyang Liu Tianpeng Zhang Ce Song Zhihuan Weng Jinyan Wang Xigao Jian State key laboratory of Fine Chemicals Department of Polymer Materials&EngineeringLiaoning Province Engineering Research Centre of High Performance ResinsDalian University of TechnologyDalian 116024LiaoningChina School of Materials Science and Engineering Key Laboratory of Energy Materials and Devices(Liaoning Province)State Key Laboratory of Fine ChemicalsLiaoning Province Engineering Centre of High Performance ResinsDalian University of TechnologyDalian 116024LiaoningChina School of Mathematical Sciences Dalian University of TechnologyDalian 116024LiaoningChina

The electrochemical performance of hard carbon in sodium storage is still limited by its poor cycling stability and rate capability because of the sluggish kinetics *** this study,we use a simple and effective method to accelerate the kinetics process by engineering the structure of the electrode to promote its surface and near-surface *** goal is realized by the use of slightly aggregated ultra-small carbon *** large specific surface area formed by the small spheres can provide abundant active sites for electrochemical *** abundant mesopores and macropores derived from the secondary particle piled structure of the carbon spheres could facilitate the transport of electrolytes,shorten the diffusion distance of Na^(+)and accommodate the volume expansion during *** from these unique structure features,PG700-3(carbon spheres with the diameters of 40-60 nm carbonized at 700℃)exhibits high performance for sodium storage.A high reversible capacity of 163 mAh g^(-1) could be delivered at a current density of 1.0 A g^(-1) after 100 ***,at a current density of 10.0 A g^(-1),the specific capacity of PG700-3 gradually increases to 140 mAh g^(-1) after 10000 cycles,corresponding to a capacity retention of 112%.Given the enhanced kinetics of SIBs reactions,PG700-3 exhibits an excellent rate capability,i.e.,230 and 138 mAh g^(-1) at 0.1 and 5.0 A g^(-1),*** study provides a facile method to attain high performance anode materials for *** design strategy and improvement mechanism could be extended to other materials for high rate applications.

关键词： Sodium ion batteries Anode Carbon spheres High rate capability Surface reactions

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A lightweight nitrogen/oxygen dual-doping carbon nanofiber interlayer with meso-/micropores for high-performance lithium-sulfur batteries

引用

Journal of Energy Chemistry 2021年第7期30卷 115-123页

作者： Fangyuan Hu Hao Peng Tianpeng Zhang Wenlong Shao Siyang Liu Jinyan Wang Chenghao Wang Xigao Jian School of Materials Science and Engineering State Key Laboratory of Fine ChemicalsKey Laboratory of Energy Materials and Devices(Liaoning Province).Dalian University of TechnologyDalian 116024LiaoningChina State key laboratory of Fine Chemicals Liaoning Province Engineering Research Centre of High Performance Resins.Dalian University of TechnologyDalian 116024LiaoningChina School of Mathematical Sciences Dalian University of TechnologyDalian 116024LiaoningChina

Lithium-sulfur(Li-S) batteries are promising energy-storage devices for future generations of portable electronics and electric vehicles because of the outstanding energy density,low cost,and nontoxic nature of *** the past decades,various novel electrodes and electrolytes have been studied to improve the performance of Li-S ***,the very limited lifespan and rate performance of Li-S batteries originating from the dissolution and diffusion of long-chain polysulfides in liquid electrolytes,and the intrinsic poor conductivity of S severely hinder their practical ***,an electrospinning method was developed to fabricate a thin conductive interlayer consisting of meso-/microporous N/O dual-doping carbon nanofiber(CNF).The freestanding 3 D interwoven structure with conductive pathways for electrons and ions can enhance the contact between polysulfides and N/O atoms to realize the highly robust trapping of polysulfides via the extremely polar ***,combining the meso-microporous N/O dual-doping CNF interlayer with a monodispersed S nanoparticle cathode results in a superior electrochemical performance of 862.5 mAh/g after 200 cycles at 0.2 C and a cycle decay as low as 0.08% per *** area specific capacity of 5.22 mAh/cm^(2) can be obtained after 100 cycles at 0.1 C with a high S loading of 7.5 mg/cm^(2).

关键词： Lithium-sulfur batteries Cathode interlayer Electrospinning Nitrogen/oxygen dual-doped carbon nanofibers Meso-micropore structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：