检索结果-南通市图书馆

Progress in Natural Science:Materials International 2020年第2期30卷 160-167页

作者： Ahmed Shawky Maha Alhaddad r.M.Mohamed Nasser S.Awwad Hala A.Ibrahium Nanomaterials and Nanotechnology Department Advanced Materials DivisionCentral Metallurgical R&D Institute(CMRDI) P.O.Box 87 Helwan Department of Mechanical Engineering School of EngineeringThe University of Tokyo Chemistry Department Faculty of ScienceKing Abdulaziz University research Centre for Advanced Materials Science (rCAMS) King Khalid University Department of Biology Nuclear Materials Authority

Atrazine(ATZ) is a known herbicide used in agriculture and caused many concerns according to its ***,we have prepared NiCo2O4nanorods that can work as a photocatalyst under visible light exposure by Ag loading through a simple *** characterizations revealed the role of Ag for improving the structural,optical and optoelectronic properties of the produced *** Ag loading with 5 wt% confirms the minimization of the bandgap from 3.6 down to 2.57 eV with enhanced visible light absorption and sustaining the magnetic *** Ag/NiCo2O4nanorods showed a superior photodegradation of ATZ within 20 min at2.0 g L-1with excellent *** enhancement of the photocatalytic activity is referred to the local surface plasmon resonance of Ag-loaded *** reduces the electron-hole recombination and outperforms the unloaded *** work is highlighting the application of magnetically separable spinel photocatalysts for the removal of herbicides and water remediation.

关键词： Spinel photocatalyst Visible light Photodegradation Atrazine Magnetic separation

振动条件下EPS缓冲层对挡土墙受力与变形影响的水平条分法模型研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

土木工程学报 2008年第10期41卷 73-80页

作者：汪益敏 Bathurst r J 华南理工大学广东广州510640 royal Military College of Canada Kingston Ont.

基于考虑时间因素的显示有限差分原理,提出水平条分法数值模型,分析铺设在挡土墙背的EPS(Expanded Polystyrene)土工泡沫缓冲层对振动作用下挡土墙的受力与变形的减震作用。模型中EPS缓冲层为线弹性材料,墙背填土滑楔体被划分为若干个... 详细信息

基于考虑时间因素的显示有限差分原理,提出水平条分法数值模型,分析铺设在挡土墙背的EPS(Expanded Polystyrene)土工泡沫缓冲层对振动作用下挡土墙的受力与变形的减震作用。模型中EPS缓冲层为线弹性材料,墙背填土滑楔体被划分为若干个水平土层,每一个水平土层的边界受力与变形分别采用与应力相关的线性弹簧模拟。计算得出振动加速过程中挡土墙背不同高程位置各土条随时间而变化的压力和压缩变形值。以加拿大皇家军事学院岩土工程中心完成的3个室内缩小比例的EPS缓冲层挡土墙振动试验为计算实例,对比研究不同弹性模量的EPS缓冲层减震作用的理论计算结果和试验监测结果。研究结果显示,在水平振动加速度达到0.9g的整个加速过程中理论模型分析预测的沿挡土墙背高程分布的压缩变形以及最大压力与试验监测结果相当一致。该模型的提出,为分析和预测采用EPS土工泡沫作为抗震缓冲层的挡土墙受力和变形提供了可行的方法,对挡土墙的抗震设计有较好的应用价值。

关键词：振动力 EPS土工泡沫挡土墙水平条分法理论模型

Sign-Changing and Multiple Solutions Theorems for Semilinear Elliptic Boundary Value Problems with Jumping Nonlinearities

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2000年第1期16卷 113-122页

作者： Shujie Li Zhitao Zhang Institute of Mathematics,Academia Sinica,Beijing 100080,P.r.China Institute of Mathematics Academia Sinica Beijing 100080 P.R. China

In this paper,we use the ordinary differential equation theory of Banach spaces and minimax theory,and in particular,the relative mountain pass lemma to study semilinear elliptic boundary value problems with jumping nonlinearities at zero or infinity,and get new multiple solutions and sign- changing solutions theorems,at last we get up to six nontrivial solutions.

关键词： Sign-changing solutions Dirichlet problems Multiple solutions Jumping nonlinearities

Influence of isovector pairing and particle-number projection effects on spectroscopic factors for one-pair like-particle transfer reactions in proton-rich even-even nuclei

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第4期42卷 171-187页

作者： Y.Benbouzid N.H.Allal M.Fellah M.r.Oudih Laboratoire de Physique Theorique-Faculte de Physique-USTHB BP32 El-Alia16111 Bab-EzzouarAlgerAlgeria

Isovector neutron-proton（np） pairing and particle-number fluctuation effects on the spectroscopic factors（SF） corresponding to one-pair like-particle transfer reactions in proton-rich even-even nuclei are studied. With this aim, expressions of the SF corresponding to two-neutron stripping and two-proton pick-up reactions, which take into account the isovector np pairing effect, are established within the generalized BCS approach, using a schematic definition proposed by Chasman. Expressions of the same SF which strictly conserve the particle number are also established within the Sharp-BCS（SBCS） discrete projection method. In both cases, it is shown that these expressions generalize those obtained when only the pairing between like particles is considered. First, the formalism is tested within the richardson schematic model. Second, it is applied to study even-even proton-rich nuclei using the single-particle energies of a Woods-Saxon mean-field. In both cases, it is shown that the np pairing effect and the particle-number projection effect on the SF values are important, particularly in N =Z nuclei, and must then be taken into account.

关键词： neutron-proton pairing particle-number fluctuations spectroscopic factor

Frontier orbitals and quasiparticle energy levels in ionic liquids

在线全文

学校读者我要写书评

暂无评论

作者： r.·祖贝

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 441-447页

作者： Juhan Matthias Kahk Ivar Kuusik Vambola Kisand Kevin r.J.Lovelock Johannes Lischner Department of Materials Imperial College LondonSouth KensingtonLondon SW72AZUK Institute of Physics University of TartuW.Ostwaldi 150411 TartuEstonia School of Chemistry Food and PharmacyUniversity of ReadingReading RG66DXUK Department of Physics and Department of Materials and the Thomas Young Centre for Theory and Simulation of Materials Imperial College LondonLondon SW72AZUK

Ionic liquids play an important role in many technological applications and a detailed understanding of their frontier molecular orbitals is required to optimize interfacial barriers,reactivity and stability with respect to electron injection and *** this work,we calculate quasiparticle energy levels of ionic liquids using first-principles many-body perturbation theory within the GW approximation and compare our results to various mean-field approaches,including semilocal and hybrid density-functional theory and *** find that the mean-field results depend qualitatively and quantitatively on the treatment of exchange-correlation effects,while GW calculations produce results that are in excellent agreement with experimental photoelectron spectra of gas phase ion pairs and ionic *** results establish the GW approach as a valuable tool for understanding the electronic structures of ionic liquids.

关键词： liquids ionic quasi

rISK ANALYSIS OF ErOSION BELOW THE DAM OF Er TEN PrOJECT

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

Journal of Hydrodynamics 1991年第3期3卷 19-25页

作者： Xu Zu-xin Guo Zi-zhong, Hohai University, Nanjing 210024, P.r.China Hakai Univ Nanjing China

The erosion risk below the dam of Er Tan project, which comes from the flood relief of the spillway and mid- dle outlet spillway, is analysed by risk analysis theory. According to the analysis results, it is imperative that the stilling pool below the dam should be adopted to protect river bed from erosion. From the view of risk-protection and economy, the Er Tan project design scheme that adopted the stilling pool is coincident with safe and economical rules. It is efficient and scientific. The erosion risk analysis method used in the paper can be used in other projects. The results are certainly of reference value and great significance for engineering design.

关键词： rISK ANALYSIS OF ErOSION BELOW THE DAM OF Er TEN PrOJECT Er

Adaptive Differentiators via Second Order Sliding Mode for a Fixed Wing Aircraft

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2015年第3期104卷 159-184页

作者： M.Zaouche A.Beloula r.Louali S.Bouaziz M.Hamerlain Laboratoire Controle et Commande Ecole Militaire PolytechniqueBP 17 Bordj El BahriAlger16000Algeria University of Paris-Sud IEF UMR 8622F-91405 OrsayFrance Center of Development of Advanced Technologies Alger16000Algeria

Safety automation of complex mobile systems is a current topic issue in industry and research laboratories,especially in *** dynamic models of these systems are nonlinear,Multi-Input Multi-Output(MIMO)and tightly *** nonlinearity resides in the dynamic equations and also in the aerodynamic coefficients’*** paper is devoted to developing the piloting law based on the combination of the robust differentiator with a dynamic adaptation of the gains and the robust controller via second order sliding mode,by using an aircraft in virtual simulated *** deal with the design of an autopilot controller,we propose an environment framework based on a Software In the Loop(SIL)methodology and we use Microsoft Flight Simulator(FS-2004)as the environment for plane *** first order sliding mode control may be an appropriate solution to this piloting ***,its implementation generates a chattering phenomenon and a singularity *** overcome these problems,a new version of the adaptive differentiators for second order sliding modes is proposed and used for *** the sliding mode algorithm,higher gains values may be used to improve accuracy;however this leads to an amplification of noise in the estimated signals.A good tradeoff between these two criteria(accuracy,robustness to noise ratio)is difficult to *** the one hand,these values must increase the gains in order to derive a signal sweeping of some frequency *** the other hand,low gains values have to be imposed to reduce noise ***,our goal is to develop a differentiation algorithm in order to have a good compromise between error and robustness to noise *** fit this requirement,a new version of differentiators with a higher order sliding modes and a dynamic adaptation of the gains,is proposed:the first order differentiator for the control of longitudinal speed and the second order differentiator for the control of the Euler ang

关键词： Adaptive differentiators second order sliding modes Dynamic adaptation of the gains Microsoft Flight Simulator

A comparative evaluation of microstructural and mechanical behavior of fiber laser beam and tungsten inert gas dissimilar ultra high strength steel welds

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

Defence Technology（防务技术） 2016年第6期12卷 464-472页

作者： Jaiteerth r. JOSHI Mastanaiah POTTA Kumar ADEPU ramesh Kumar KATTA Madhusudhan reddy GANKIDI Defence research and Development Laboratory Kanchanbagh Hyderabad Telangana 500058 India National Institute of Technology Warangal Telangana 502205 India Defence Metallurgical research Laboratory Kanchanbagh Hyderabad Telangana 500058 India

The influence of different welding processes on the mechanical properties and the corresponding variation in the microstructural features have been investigated for the dissimilar weldments of 18% Ni maraging steel 250 and AISI 4130 steel. The weld joints are realized through two different fusion welding processes, tungsten inert arc welding(TIG) and laser beam welding(LBW), in this study. The dissimilar steel welds were characterized through optical microstructures, microhardness survey across the weldment and evaluation of tensile properties. The fiber laser beam welds have demonstrated superior mechanical properties and reduced heat affected zone as compared to the TIG weldments.

关键词： TIG welding Fiber laser AISI 4130 steel Laser beam welding Maraging steel

On the Duality Mapping Sets in Orlicz Sequence Spaces

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2001年第4期17卷 595-602页

作者： Bao Xiang WANG Department of Mathematics, Hebei University, Baoding 071002, P. r. China Department of Mathematics Hebei University Baoding 071002 P. R. China

The criteria for the weak compactness of duality mapping sets J(x)={f∈X~*:〈f,x〉= ‖f‖~2=‖x‖~2}in Orlicz sequence spaces endowed either with the Luxemburg norm or with the Orlicz norm are obtaned.

关键词： Orlicz sequence spaces Duality mapping Weak compactness