检索结果-南通市图书馆

Journal of Thermal Science 2003年第1期12卷 89-96页

作者： H.k.Ma e.Zhao k.M.Chung C.L.Yeh Dept of Mechanical engineering National Taiwan UniversityDept of Mechanical Engineering National Taiwan UniversityDept of Mechanical Engineering National Taiwan UniversityDept of Mechanical Engineering Da-Yeh University 112 Taipei Taiwan 10764 China Taipei Taiwan 10764 ChinaTaipei Taiwan 10764 ChinaShan-Jeau Rd Dah-Tsuen Chang-Hwa Taiwan 51505 China

This study is using HMDSA (C6H19NSi2) or HMDSO (C6H18OSi2) vapor into C3H8/air premixed flames to form SiO2 thin film on the surface of an aluminum plate. With the addition of HMDSO or HMDSA to premixed flames, an orange secondary flame or a flame brush appeared and was contributed to the formation of Sio2 particles. Based upon the eDS, XPS and FTIR analysis, it is believed that the synthesized products consist of mainly SiO2 and a small amount of SiO. The pure SiO2 crystal structure, was proved by XRD analysis, which may form from the SiO2 amorphous structure after high temperature (1300C) thermal treatment. The nano-size SiO2 particles, which ranged from 2.5-25 nm, are proved by analysis of the BeT and TeM. A 2-D CFD-RC code with 12 reduced chemical reaction mechanism, based upon the SIMPLeR procedure, was successfully employed to predict the flame temperature and both of the SiO2 and SiO concentration profiles. Compared with the experimental results, the calculated temperature profiles in the post-flame region are in good agreement with the measured data and observation phenomena.

关键词： nano size thin film SiO2.

ON THe eXISTeNCe AND STABILITY OF BOUNDARY VALUe PROBLeM FOR DIFFeReNTIAL eQUATION WITH HILFeR-kATUGAMPOLA FRACTIONAL DeRIVATIVe

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2019年第6期39卷 1568-1578页

作者： e.M.eLSAYeD S.HARIkRISHNAN k.kANAGARAJAN Mathematics Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia Department of Mathematics Faculty of Science Mansoura UniversityMansoura 35516Egypt Department of Mathematics Sri Ramakrishna Mission Vidyalaya College of Arts and ScienceCoimbatore-641020TamilnaduIndia

In this paper, we discuss the existence, uniqueness and stability of boundary value problem for differential equation with Hilfer-katugampola fractional derivative. The arguments are based upon Schaefer's fixed point ... 详细信息

关键词： Hilfer-katugampola fractional derivative boundary condition existence Ulam stability

Free Oxide Distribution in Poorly and Well Drained Soils Developed on Calcareous Alluvial Deposits

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2003年第4期13卷 345-351页

作者： N. k. MOUSTAkAS P. e. BAROUCHAS Agricultural University of Athens Laboratory of Soil Science and Agricultural Chemistry 75 /era Odos Botanikos 11855Agricultural University of Athens Laboratory of Soil Science and Agricultural Chemistry 75 /era Odos Botanikos 11855

A study on the distribution of free iron and manganese oxides was conducted in soils developed on calcareous alluvial deposits under subhumid climatic conditions, in Western Greece. Soil samples from two well drained soils and from two poorly drained soils, classified as Alfisols, were collected and used in this study. After certification of soil homogeneity the acid ammonium oxalate and dithionite-citrate-bicarbonate methods were used to extract free iron and manganese oxides from the samples. Iron oxides extracted by the dithionite-citrate-bicarbonate method (Fed) were significantly higher than the iron oxides extracted by the ammonium oxalate method (Feo), indicating that a considerable fraction is present in crystalline forms,independent of drainage status. A confirmation of free iron oxides and fine clay was detected. The ratios Feo/Fed and (Fed-Feo)/total Fe (Fet) could not be used to distinguish the well drained soils from the poorly drained soils. Manganese movement in a soluble form is independent of the fine clay.

关键词： argillic horizon calcareous alluvial deposits iron oxides manganeseoxides soil homogeneity

On the Time Fractional Modulation for electron Acoustic Shock Waves

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2017年第3期34卷 86-89页

作者： H.G.Abdelwahed e.k.el-Shewy A.A.Mahmoud College of Science and Humanity Studies Al-kharj Department of PhysicsPrince Sattam Bin Abdulaziz University Theoretical Physics Group Department of PhysicsFaculty of ScienceMansoura University

Nonlinear features of electron-acoustic shock waves are studied. The Burgers equation is derived and converted to the time fractional Burgers equation by Agrawal＇s method. Using the Adomian decomposition method, the shock wave solutions of the time fractional Burgers equation are constructed. The effect of time fractional parameter on the shock wave properties in auroral plasma ＆ investigated.

关键词： On the Time Fractional Modulation for electron Acoustic Shock Waves

Unveiling the Optimal Interfacial Synergy of Plasma-Modulated Trimetallic Mn-Ni-Co Phosphides:Tailoring Deposition Ratio for Complementary Water Splitting

在线全文

学校读者我要写书评

暂无评论

energy & environmental Materials 2023年第2期6卷 129-141页

作者： kholoud e.Salem Amina A.Saleh Ghada e.khedr Basamat S.Shaheen Nageh k.Allam energy Materials Laboratory(eML) School of Sciences and EngineeringThe American University in CairoNew Cairo 11835Egypt

Designing highly active,durable,and nonprecious metal-based bifunctional electrocatalysts for overall water electrolysis is of urgent scientific importance to realize the sustainable hydrogen production,which remains a grand ***,an innovative approach is demonstrated to synthesize flower-like 3D homogenous trimetallic Mn,Ni,Co phosphide catalysts directly on nickel foam via electrodeposition followed by plasma *** electrochemical activity of the catalysts with varying Mn:Ni:Co ratios is assessed to identify the optimal composition,demonstrating that the equimolar trimetallic phosphide yields an outstanding HeR catalytic performance with a current density of 10 mA cm^(-2) at an ultra-low overpotential of~14 mV,outperforming the best reported *** is asserted by the DFT calculations,revealing strong interaction of the metals and the P atom,resulting in enhanced water activation and optimized G_(H)^(*)values for the HeR ***,this optimal composition appreciably catalyzes the OeR by exposing more intrinsic active species in-situ formed on the catalyst surface during the ***,the Mn_(1)-Ni_(1)-Co_(1)-P-(O)/NF catalyst exhibits a decreased overpotential of~289 mV at 10 mA cm^(-2).More importantly,the electrocatalyst sustains perfect durability up to 48 h at a current density of 10 mA cm^(-2) and continued 5000 cycling stability for both HeR and ***,the assembled MNC-P/NF||MNC-P/NF full water electrolyzer system attains an extremely low cell voltage of 1.48 V at 10 mA cm^(-2).Significantly,the robust stability of the overall system results in a remarkable current retention of~96%after a continuous 50-h ***,this study provides a facile design and a scalable construction of superb bifunctional ternary MNC-phosphide electrocatalysts for efficient electrochemical energy production systems.

关键词： DFT overall water splitting oxygen evolution reaction(OeR)/hydrogen evolution reaction(HeR) plasma ternary metallic phosphides(MnNiCo)

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第7期72卷 104-110页

作者： F Ungan M k Bahar S Pal M e Mora-Ramos Faculty of Technology Department of Optical EngineeringSivas Cumhuriyet University58140SivasTurkey Faculty of Science Department of PhysicsSivas Cumhuriyet University58140 SivasTurkey Department of Quality Assurance CQA(SA)DGQA Ichapur-Nawabganj24Pgs(North)743144West BengalIndia Centro de Investigación en Ciencias Instituto de Investigación en Ciencias Básicas y AplicadasUniversidad Autónoma del Estado de MorelosAv.Universidad 1001CP62209CuernavacaMorelosMexico Facultad de Ciencias Básicas Universidad de MedellínMedellinColombia

We present a theoretical study on the effects of intense laser field(ILF)and static electric field on the linear and nonlinear optical properties of a cylindrical quantum dot with Rosen-Morse axial potential under the framework of effective mass and parabolic band *** study also takes into account the effects of the structure parameters(η,V1,and R).The analytical expressions of the linear,third-order nonlinear and total optical absorption coefficients(TOACs)and the relative refractive index changes(RRICs)are obtained by using the compact-densitymatrix *** results of numerical calculations show that the resonant peak position of the TOACs and RRICs shifts towards lower energies and the magnitude of the peak increases with the effect of the static electric field and *** addition,it is observed that while the resonant energies of the TOACs and RRICs of system shift towards the higher(lower)energies with the enhancement ofη,V1,they decrease with the augmentation of ***,the findings of this study show that the optical properties of the structure can be adjusted by changing the magnitude of structure parameters and applied external fields.

关键词： cylindrical quantum dot nonlinear optical response intense laser field electric field

Oxidation Resistance of the Aluminide Coating Formed on Carbon Steels

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1997年第5期13卷 383-388页

作者： Soliman, H.M. Ohamed, k.e. Abd el-Azim, M.e. Hammad, F.H. Metallurgy Dept. Atomic Energy Authority Cairo Egypt

Low and medium carbon steels were aluminized by the pack aluminizing technique using halideactivated pure-Al and Fe-Al packs. The effect of mixture composition, aluminizing temperatureand time and C content of the steel substrate on the structure and thickness of the aluminidelayer, and on the oxidation resistance was investigated. The optimum oxidation resistance canbe achieved with a low carbon steel substrate when the intermetallic phases Fe3Al and FeAlform the surface of the aluminide layer. In this case, the Al concentration at the surface of thealuminide coating is at least ≥15 wt pct. Formation of high Al concentration phases (FeAl3 andFe2Al5) during aluminizing should be avoided as they tend to embrittle the aluminide layer andreduce its oxidation resistance.

关键词： OO Figure Oxidation Resistance of the Aluminide Coating Formed on Carbon Steels

A Conceptual Design Study for the error Field Correction Coil Power Supply in JT-60SA

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2013年第3期15卷 257-260页

作者： M.MATSUkAWA k.SHIMADA k.YAMAUCHI e.GAIO A.FeRRO L.NOVeLLO Japan Atomic energy Agency 801-1 MukoyamaNakaIbaraki 311-0193Japan Consorzio RFX-eURATOM eNeA Association C.so Stati Uniti 435127 PadovaItaly Fusion for energy Boltzmannstr 2 Garching 85748Germany

This paper describes a conceptual design study for the circuit configuration of the error Field Correction Coil （eFCC） power supply （PS） to maximize the expected performance with reasonable cost in JT-60SA. The eFCC consists of eighteen sector coils installed inside the vacuum vessel, six in the toroidal direction and three in the poloidal direction, each one rated for 30 kA-turn. As a result, star point connection is proposed for each group of six eFCC coils installed cyclically in the toroidal direction for decoupling with poloidal field coils. In addition~ a six phase inverter which is capable of controlling each phase current was chosen as PS topology to ensure higher flexibility of operation with reasonable cost.

关键词： JT-60SA error field correction coil power supply inverter multi-phase

effects of Impurity on the Ground—State Transitions of a Quantum Dot in Strong Magnetic Field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2001年第6期35卷 735-739页

作者： k.S.CHAN e.Y.B.PUN 等 DepartmentofPhysicsandMaterialsScience CityuniversityofHongKongHongKongChina Departmentofelectronic

The low-lying spectra of parabolic quantum dots with or without an impurity at the center are investigated.While it has been known that the electron-electron interaction leads to ground-state transitions on magic values of angular momentum in a magnetic field. We show, in this paper, that the implantation of an impurity ion at the center can either enhance or suppress such transitions, depending on whether it is an acceptor or a donor ion.

关键词： impurity states quantum dots

Prognostication of hydrocarbon generative potential in the onshore and offshore Niger Delta, Nigeria using TOC content and rock-eval pyrolysis techniques

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

Chinese Journal Of Geochemistry 2014年第2期33卷 138-144页

作者： Nyantakyi e.k. Li Tao Hu Wangshui Borkloe J.k. Nagre R.D. Civil engineering Department Kumasi Polytechnic School of earth Science Yangtze University Chemical engineering Department Kumasi Polytechnic College of Petroleum engineering Yangtze University

This article prognosticates the hydrocarbon generation potential of core samples from fields A, B, C and D in Niger delta, Nigeria. The objectives of this study are to characterize the quality of these core samples by organic geochemical analyses. A total of ten core samples collected from fields A, B, C and D in Niger delta were analyzed using total organic carbon(TOC) content analysis, rock-eval pyrolysis technique. The analytical results of the studied core samples reveal that they have generally high total organic carbon contents(TOC), suggesting that conditions in the Niger delta favour organic matter production and preservation. There is a variation in the kerogen types and this may be attributed to the relative stratigraphic positions of the core samples within the Niger delta. The rock-eval results indicate that the samples from fields C and D contain predominantly Type II kerogen with a capacity to generate oil and gas and hence have good generative potential. The samples from fields A and B contain mainly Type III kerogen and are gas-prone with moderate generative potential.

关键词：尼日尔三角洲热解技术尼日利亚生烃潜力 TOC 岩石潜力预测干酪根类型