检索结果-南通市图书馆

Geotectonica et Metallogenia 2001年第1期25卷 99-105页

作者： peng sheng lin, liu liang ming, lai jian qing (Institute of Diwa Theory and Metallogeny, Central South University, Changsha 410083, China) Institute of Diwa Theory and Metallogeny Central South UniversityChangsha 410083China

The metallogenic theory of polygenetic compound ore deposit is the important basis for location prediction of hidden ore deposits in diwa regions. It can play an important role in each step of prediction research, targeting procedure, acquiring information and integrating information. In this paper, the authors discusses how to construct geological concept by using of the metallogenic theory of polygenetic ore deposits for predicting targeting area, to arrange investigation and detection for getting enough useful information, and to analyze and integrate information for reaching a trustful prediction conclusion. According to these strategies, we conduct a successful prediction of location of hidden ore bodies in the outer of the Fenghuangshan copper mine, a principal producing mine in Tongling Cu Au district.

关键词： Location prediction of hidden ore deposits polygenetic compound ore deposits information exploration Fenghuangshan Tongling

MODElinG ON DYNAMIC PROCESS OF MEMBRANE FOUlinG DURING FINITE CROSSFLOW ULTRAFILTRATION IN CHARGED SYSTEM

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2006年第2期18卷 206-210页

作者： LUO ming-liang PU Chun-sheng ZHAO jian-qing College of Petroleum Engineering China University of Petroleum （East China） Dongying 257061 China College of Materials Science and Engineering South China University of Technology Guangzhou 510640 China

Flux decline during finite crossflow Ultrafiltration（UF） in charged system was investigated by perceiving membrane fouling as a dynamic process from non-equilibrium to equilibrium. Under the influence of the boundary condition at the initial section and cross flow, the equilibrium is first reached at the initial section of the crossflow filter and the front of the equilibrium region progresses with time toward the end of the filter. A mathematic model was developed to describe this dynamic process of membrane fouling in a charged system. With the model, the time-dependent flux and the time required to reach the steady state in a crossflow filtration can be easily determined. The fouling process under different conditions is simulated as illustrated with a demonstration of the newly developed model. The resulls of simulation show that there are jumps in the local flux at the front of the equilibrium region and the electrokinetic properties of charged UF system have a very substantial influence on the separation performance of membrane.

关键词： fouling dynamics flux decline,Ultrafiltration(UF) charged system modeling

Facile fabrication of ZnO-CuO porous hybrid microspheres as lithium ion battery anodes with enhanced cyclability

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第5期36卷 403-410页

作者： qing-Shui Xie liang lin Ya-Ting Ma Jing-Ren Yang jian Huang lai-Sen Wang Dong-liang peng Department of Materials Science and Engineering Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of MaterialsXiamen UniversityXiamen 361005China

ZnO–CuO porous hybrid microspheres were successfully produced through a facile aging process of zinc citrate solid microspheres in copper sulfate solution combined with the subsequent annealing treatment in air atmosphere. The electrochemical performance investigation suggests that the harvested ZnO–CuO porous hybrid microspheres illustrate much higher specific capacity and better cycling stability than single ZnO counterparts. A reversible capacity of 585 mAh·g^-1 can be acquired for ZnO–CuO porous hybrid microspheres after cycling 500 times at a current density of 200 mA·g^-1. The porous configuration and the incorporation of CuO are responsible for the enhanced lithium storage properties of ZnO–CuO hybrids.

关键词： Zinc oxide Copper oxide Porous structures Lithium ion battery Anodes

Synthesis and microwave absorbing properties of La-doped Sr-hexaferrite nanopowders via sol-gel auto-combustion method

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第9期36卷 704-710页

作者： Jun-liang liu peng Zhang Xing-Kai Zhang qing-qing Xie Dong-Jun Pan jian Zhang ming Zhang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

La-doped Sr-hexaferrite（Sr（1-x）LaxFe（12）O（19））（x=0.05,0.10,0.15,0.20） nanopowders with particle size ranging from 80 to 110 nm were successfully synthesized by sol-gel auto-combustion. The phase formation temperature increases, while the particle size decreases as the Ladoping content goes up. The partial substitution of Sr^（2＋） by La^（3＋） results in the suppression effects on the growth-up of the crystallites and the enhancement of the electron hopping between Fe^（3＋） with different valences, which leads to the improvement in the dielectric loss and magnetic ***, both the microwave absorbing abilities and absorbing frequency ranges are tuned by La-doping. The synthesized Sr-hexaferrite nanopowders with doping element content of 0.10 demonstrate the fine broad microwave absorbing properties.

关键词： Ferrite La-doping Nanopowders Sol-gelauto-combustion Microwave absorbing properties

REE characteristics and genesis of alkaline-rich porphyry, Yunnan Province

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2001年第1期8卷 45-49页

作者： lai jian qing,WU Cheng jian,peng sheng lin (Institute of Geology, Central South University, Changsha 410083, China) 1. Institute of Geology Central South University 410083 Changsha China

The Yunnan Himalayan alkaline rich porphyry occurs as a compound rockbelt and consists of calca alkalic, alkaline and peralkaline intrusions. Its origin is in debate. The paper deals with its origin by studying rock′s REE and Sr isotope. Although the rocks are different in their REE contents varying from 77.53 μg/g to 1 798.3 μg/g, they have very similar features in REE parameters. On the triangalar diagram of REEs, the sample dots are concentrated on the end area of light REEs, representing a product of low degree melting of upper mantle or lower crust materials. The initial 87 Sr/ 86 Sr values of rocks vary between 0.706 4 and 0.709 8, showing a feature of mantle crust mixed source. Moreover, REEs show a logarithmic linear positive correlation between them. This type of correlation strongly supports the fractional partial melting model. The result of geochemistry inversion shows that the source rock of alkaline rich porphyry is plagioclase bearing harzburgite and of mantle crust mixed type. At the early state of melting, some crust components of the source rock were partially melted into intermediate acidic magma; with the crust components consumed, the magma evolved to basic.

关键词： alkaline rich porphyry REE genesis Sr isotope Yunnan

Facile synthesis of PdCu nanocluster-assembled granular films as highly efficient electrocatalysts for formic acid oxidation

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第8期41卷 2595-2605页

作者： qing-Wei Ding qing Luo liang lin Xing-Ping Fu lai-Sen Wang Guang-Hui Yue Jie lin qing-Shui Xie Dong-liang peng College of Materials Xiamen UniversityXiamen361005China Fujian Provincial Key Laboratory of Eco-Inductrial Green Technology Wuyi UniversityWuyishan354300China

Developing efficient and stable bimetallic Pdbased anode electrocatalysts toward formic acid oxidation(FAO)is of great significance for commercial applications of direct formic acid fuel cells(DFAFCs).Herein,we report a facile synthesis approach to fabricate PdCu nanoclusters(NCs)catalysts with granular-film *** introduction of Cu can adjust the electronic structure and d-band center of Pd,which can improve the catalytic performance of the *** with Pd NCs catalyst,the catalytic durability and activity of PdCu NCs catalysts for FAO are greatly *** order for catalytic activity of NC metals is Pd_(85)Cu_(15)NCs>Pd_(70)Cu_(30)NCs>Pd *** maximum mass activity can be acquired with the Pd_(85)Cu_(15)NCs catalyst,which is about1.7 times that of the Pd NCs *** Pd_(85)Cu_(15)NCs catalyst still maintains the highest catalytic current density after 50 cycles,indicating that Pd_(85)Cu_(15)NCs catalyst has the best durability and electrocatalytic activity for *** work provides a new prospect for the design of highly efficient anode catalysts materials for DFAFCs.

关键词： Plasma gas-condensation method Formic acid electrooxidation Direct formic acid fuel cells(DFAFCs) PdCu nanoclusters catalyst

Brain-inspired multimodal approach for effluent quality prediction using wastewater surface images and water quality data

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第3期18卷 69-82页

作者： Junchen Li Sijie lin liang Zhang Yuheng liu Yongzhen peng qing Hu School of Environment Harbin Institute of TechnologyHarbin 150090China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Engineering Innovation Center of SUSTech(Beijing) Southern University of Science and TechnologyBeijing 100083China Faculty of Environment and Life Beijing University of TechnologyBeijing 100124China Engineering Research Center of Intelligence Perception and Autonomous Control Ministry of EducationBeijing 100124China

Efficiently predicting effluent quality through data-driven analysis presents a significant advancement for consistent wastewater treatment *** this study,we aimed to develop an integrated method for predicting effluent COD and NH3 *** employed a 200 L pilot-scale sequencing batch reactor(SBR)to gather multimodal data from urban sewage over 40 *** we collected data on critical parameters like COD,DO,pH,NH_(3),EC,ORP,SS,and water temperature,alongside wastewater surface images,resulting in a data set of approximately 40246 *** we proposed a brain-inspired image and temporal fusion model integrated with a CNN-LSTM network(BITF-CL)using this *** innovative model synergized sewage imagery with water quality data,enhancing prediction *** a result,the BITF-CL model reduced prediction error by over 23%compared to traditional methods and still performed comparably to conventional techniques even without using DO and SS sensor ***,this research presents a cost-effective and precise prediction system for sewage treatment,demonstrating the potential of brain-inspired models.

关键词： Wastewater treatment system Water quality prediction Data driven analysis Brain-inspired model Multimodal data Attention mechanism

Mechanisms and applications of layer/spinel phase transition in Li-and Mn-rich cathodes for lithium-ion batteries

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

Rare Metals 2022年第5期41卷 1456-1476页

作者： Wei He qing-Shui Xie Jie lin Bai-Hua Qu lai-Sen Wang Dong-liang peng State Key Laboratory of Physical Chemistry of Solid Surface Fujian Key Laboratory of Materials GenomeCollaborative Innovation Center of Chemistry for Energy MaterialsCollege of MaterialsXiamen UniversityXiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518000China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China

Li-and Mn-rich(LMR)cathode materials have received tremendous attention due to the highly reversible specific capacity(>250 m Ah·g^(-1)).In the analysis of its crystal structure,the two-phase composite model gains increasing acceptance,and the phase transition behaviors in LMR cathode materials have been extensively ***,the structure controversy of LMR cathode materials,and the mechanisms of phase transition are ***,the causes of initiating or accelerating the phase transition of LMR cathode materials have been summarized into three main driving forces,i.e.,the electrochemical driving force,the component driving force and the thermodynamic driving ***,the applications of phase transition behavior in improving the electrochemical performance of LMR cathode materials,including the construction of spinel surface coating and spinel/layered hetero-structure are discussed.

关键词： Li-and Mn-rich cathode material Two-phase composite model Phase transition Spinel/layered hetero-structure

Content delivery network and its regulation

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2006年第4期13卷 98-101页

作者： peng Jiu-sheng liang Xiong-jian School of Economics and Management Beijing University of Posts and Telecommunications Beijing 100876 China

First, this article provides an introduction to the content delivery network （CDN）, which has wide prospects but is still in its early stages in China. Second, this article depicts the present situation and the developing characteristics of CDN in China. Elaborating on the above-mentioned two points, this article identifies the numerous problems that are encountered during the development of CDN, such as indistinct service positioning and the hidden troubles of information security. Finally, this article presents several countermeasures for handling the problems, such as opening the market widely, making a rational service positioning, strengthening the regulation on information security, and punishing illegal operations and unfair competition.

关键词： CDN Intemet information security

Optimization of sintering parameters for fabrication of Ag-sheathed FeSe superconducting wires

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2018年第5期37卷 433-438页

作者： jian-qing Feng sheng-Nan Zhang Ji-Xing liu Bo-Tao Shao Cheng-Shan Li ming liang Ping-Xiang Zhang Superconducting Materials Research Center Northwest Institute for Non-Ferrous Metal Research School of Materials Science and Engineering Northeastern University School of Materials Science and Engineering Xi'an University of Technology

Ag-sheathed Fe1.05Se superconducting wires were fabricated with ex-situ powder in tube （PIT） process. Fe and Se powders with molar ratio of 1.05 were firstly mixed and sintered under 600 ℃ for 12 h to form precursor powders. Owing to the complex Fe-Se binary phase diagram, both superconducting tetragonal FeSe and nonsuperconducting hexagonal FeSe could be formed simultaneously during sintering. Aiming at the reduction of hexagonal FeSe phase content and higher superconducting phase volume, the influences of key parameters, including sintering time, cooling rate and heating rate, on the phase composition of sintered wires were systematically studied. Optimal sintering parameters are obtained, and the maximum tetragonal FeSe phase content of ~ 97% is achieved. Meanwhile, the effects of packing density of precursor powders on the phase composition of final wires were also discussed. Owing to the shorter length of diffusion path, more tetragonal FeSe was formed with higher packing density. The superconducting transition signal with critical temperature of ~ 7.5 K was obtained, which proved the effectiveness of our optimal sintering process.

关键词： Superconductors FeSe Powder in tube Phase composition Superconducting transition