检索结果-南通市图书馆

Securing Privacy Using Optimization and Statistical Models in Cognitive Radio Networks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & engineering 2022年第8期42卷 523-533页

作者： R.Neelaveni B.Sridevi J.Sivasankari Department of Electronics and Communication engineering MNM Jain Engineering CollegeChennai60009India Department of Electronics and Communication engineering Velammal Institute of TechnologyChennai602001India Department of Electronics and Communication engineering Ultra College of Engineering and TechnologyMadurai625104India

Cognitive Radio Networks(CRN)are the possible and ideal solution for meeting the spectrum needs of next-generation communication *** is a promising alternative approach that allows spectrum sharing in many *** licensed users considered Primary Users(PU)and unlicensed users as Secondary Users(SU).Time and power consumption on security issues are considered degrading factors in performance for improving the Quality of Service(QoS).Irrespective of using different optimization techniques,the same methodology is to be updated for the *** that,learning and optimization go hand in *** ensures the security in CRN,risk factors in spectrum sharing to SU for secure *** objective of the proposed work is to preserve the location of the SU from attackers and attain the clustering of SU to utilize the *** Colony Optimization(ACO)is implemented to increase the overall efficiency and utilization of the *** is used to form clusters of SUs in the co-operative spectrum sensing *** paper deals with threat detection and classifying threats using parameters such as unlikability,context privacy,anonymity,conditional traceability,and *** this privacy-preserving model,overall accuracy is 97.4%,and it is 9%higher than the conventional models without Privacy-Preserving Architecture(PPA).

关键词： Attacks secondary users cognitive radio networks security

Strain Hardening Associated with Dislocation,Deformation Twinning,and Dynamic Strain Aging in Fe–20Mn–1.3C–(3Cu) TWIP Steels

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

Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 601-608页

作者： Lingyan Zhao Dingyi Zhu Longlong Liu Zhenming Hu Mingjie Wang college of Materials Science and engineering Fuzhou University Fujian San Ming Iron & Steel Group Co. Ltd. college of Materials Science and engineering Fujian University of Technology

The effects of Cu on stacking fault energy,dislocation slip,mechanical twinning,and strain hardening in Fe–20Mn–1.3C twinning-induced plasticity（TWIP） steels were systematically *** stacking fault energy was raised with an average slope of 2 mJ/m2 per 1 wt% *** Fe–20Mn–1.3C–3Cu steel exhibited superior tensile properties,with the ultimate tensile strength reached at 2.27 GPa and elongation up to 96.9% owing to the high strain hardening that *** examine the mechanism of this high strain hardening,dislocation density determination by XRD was *** dislocation density increased with the increasing strain,and the addition of Cu resulted in a decrease in the dislocation density.A comparison of the strain-hardening behavior of Fe–20Mn–1.3C and Fe–20Mn–1.3C–3Cu TWIP steels was made in terms of modified Crussard–Jaoul（C–J） analysis and microstructural *** at low strains,the contributions of all the relevant deformation mechanisms—slip,twinning,and dynamic strain aging—were quantitatively *** analysis revealed that the dislocation storage was the leading factor to the increase of the strain hardening,while dynamic strain aging was a minor contributor to strain ***,which interacted with the matrix,acted as an effective barrier to dislocation motion.

关键词： Twinning-induced plasticity(TWIP) Strain hardening Mechanical twinning Dislocation density Dynamic strain aging

Monte Carlo study for γ+N→π+N at a new compound target

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2008年第12期32卷 952-956页

作者：张玉春李玉晓李家才喻纯旭陈鹏吴元明牛卫平张少平 college of Physics and engineering Zhengzhou University Institute of High Energy Physics CAS Physical college Nankai University

An inbuilt compound target composed of carbon and tungsten is designed, and optimized by realistic GEANT4 Monte Carlo simulation. Also, we do a Monte Carlo study for single-pion photoproduction at the target. The results are presented from the simulation of pion yield, angular distribution and spectrum （at θlab, θcm=41^o）. These efforts are important to the coming measurement of the differential cross section forγ ＋ N →π＋N.

关键词： GEANT4 inbuilt compound target angular distribution pion yield spectrum

An universal in-situ phosphating strategy to fabricate high-performance Co_(2)P-based bifunctional oxygen electrocatalyst derived from conjugated polyaniline-phytic acid copolymer

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第11期43卷 5823-5834页

作者： Wen-Xue Chen Yue Du Li-Na Zhou Zhi-Yi Zhong Zhi-Xian Shi Yan Mao Zi-Quan Zhou Hao-Yue Feng Yu Su Hai-Yan Hu Shi Li Dong-Bin Xiong Jian-Qin Zhou Yi-Si Liu Yao Xiao Hubei Key Laboratory of photoelectric Materials and Devices School of Material Science and EngineeringHubei Normal UniversityHuangshi 435002China college of Chemistry and Materials engineering Wenzhou UniversityWenzhou325035China Hangzhou Hangyang Chemical and Medical engineering Lo. Hangzhou310000China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China Innovative Centre for Flexible Devices(iFLEX) Max Planck-NTU Joint Lab for Artificial SensesSchool of Materials Science and EngineeringNanyang Technological UniversitySingapore 639798Singapore 不详

Electrocatalysts play a crucial role in the performance of rechargeable Zn-air batteries(ZABs),but it is still difficult to produce nonprecious materials with excellent bifunctional oxygen reduction reactions(ORR)and oxygen evolution reactions(OER).Herein,conjugated polyaniline-phytic acid polymer(pANI-PA)was directly calcined to fabricate Co_(2)P nanoparticles embedded in N,P-doped carbon network composites(Co_(2)P@pDC-PA)for metal-air *** resulting pANI-PA derived Co_(2)Pbased carbon composite exhibits exceptional bifunctional ORR/OER activities with a half-wave potential of 0.79 V for ORR and 1.62 V of over-potential for OER at 10mA·cm^(-2).Owing to the synergistic effect of its unique three-dimensional(3D)structure,N,P-doped carbon framework,and encapsulated Co_(2)P nanoparticles,as-fabricated composite can be used as a highly efficient air cathode in the rechargeable metal-air *** assembled rechargeable ZAB demonstrates a high-power density of 190.0 mW·cm^(-2)and remarkable cycling stability over1000 *** study introduced a novel approach that paves the way for the efficient,cost-effective,and scalable production of bifunctional electrocatalysts for rechargeable ZABs.

关键词： Co_(2)P nanoparticles Polyaniline-phytic acid polymers(pANI-PA) Bifunctional electrocatalysts Rechargeable Zn-air batteries(ZABs)

Theoretical Analysis and Experimental Research of Surface Texture Hydrodynamic Lubrication

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical engineering 2022年第2期35卷 174-188页

作者： Dan Li Xuefeng Yang Yuanbo Wu Jian Cheng Shouren Wang Zhuang Wan Wenbo Liu Guofeng Xia college of Mechanical engineering University of JinanJinan 250022China college of Mechanical engineering Hubei University of TechnologyHubei 430068China University of Science and Technology of China HefeiChina

The research on surface texture is developing from single macro-texture to composite micro-nano *** current research on the anti-friction mechanism and theoretical models of textures is relatively *** the characteristics of different types of surface textures and determining the applicable working conditions of each texture is the focus of current *** this paper,a mathematical model of hydrodynamic lubrication is established based on Navier-Stokes *** FLUENT software is used to simulate and analyze the four texture models,explore the dynamic pressure lubrication characteristics of different texture types,and provide data support for texture *** key variable values required by the mathematical model are obtained through the simulation *** friction coefficient of the texture under different working conditions was measured through friction and wear experiments,and the mathematical model was verified by the experimental *** research results show that circular texture is suitable for low to medium speed and high load conditions,chevron texture is suitable for medium to high speed and medium to high load conditions,groove texture is suitable for high speed and low load conditions,and composite texture is suitable for high speed and medium to high load *** the experimental results with the results obtained by the mathematical model,it is found that the two are basically the same in the ranking of the anti-friction performance of different textures,and there is an error of 10%−40%in the friction coefficient *** this study,a mathematical model of hydrodynamic lubrication was proposed,and the solution method of the optimal surface texture model was determined.

关键词： Hydrodynamic lubrication Tribological characteristics Surface texture

Growth,Dislocation and Morphology of Nd∶GdVO_4 Single Crystal

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2003年第S1期21卷 86-89页

作者：马会龙臧竞存刘燕行邹玉林 college of Materials Science and engineering Beijing University of Technology college of Environment and Energy engineering Beijing University of Technology

The neodymium ions doped gadolinium vanadate (Nd∶GdVO_4) single crystals were successfully grown by Czochralski method. Chemical etching technique was used to reveal the dislocation structure of the crystals. An average dislocation density of (100) plane is 600 pits/mm 2. The crystal-morphology can be used to determine crystal orientation accurately with simple optical method.

关键词： inorganic non-metals Nd∶GdVO_4 crystal chemical etching dislocation crystallography rare earths

Situation reasoning for an adjustable autonomy system

在线全文

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2012年第2期5卷 226-238页

作者： Yin Lili Zhang Rubo Gu Hengwen college of Computer Science and Technology Harbin Engineering UniversityHarbin CityChina college of Power and Energy engineering Harbin Engineering UniversityHarbin CityChina

Purpose–The purpose of this paper is to provide a more capable and holistic adjustable autonomy system,involving situation reasoning among all involved information sources,to make an adjustable autonomy system which knows what the situation is currently,what needs to be done in the present situation,and how risky the task is in the present *** will enhance efficiency for calculating the level of ***/methodology/approach–Situation reasoning methodologies are present in many autonomous systems which are called situation *** awareness in autonomous systems is divided into three levels,situation perception,situation comprehension and situation *** awareness in these systems aims to make the tactical plans cognitive,but situation reasoning in adjustable autonomous systems aim to communicate mission assessments to unmanned vehicle or ***,in solving this problem,it is important to design a new situation reasoning module for the adjustable autonomous ***–The contribution of this paper is presenting the Situation Reasoning Module(SRM)for an adjustable autonomous system,which encapsulates event detection,cognitive situations,cognitive tasks,performance capacity assessment and integrated situation *** paper concludes by demonstrating the benefits of the SRM in a real-world scenario,a situation reasoning simulation in unmanned surface vehicles(USV)while performing a navigation ***/value–The method presented in this paper represents a new SRM to reason the situation for adjustable autonomous *** the results presented in the paper are based on fuzzy logic and Bayesian network *** results of this paper can be applicable to land,sea and air robotics in an adjustable autonomous system.

关键词： Situation reasoning Adjustable autonomous system Event detection Situation cognitive Task cognitive Performance capacity assessment Reasoning Cognition

Multiscale RBF-based central high resolution schemes for simulation of generalized thermoelasticity problems

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

Frontiers of Structural and Civil engineering 2019年第2期13卷 429-455页

作者： Hassan YOUSEFI Alireza TAGHAVI KANI Iradj MAHMOUDZADEH KANI School of Civil engineering College of EngineeringUniversity of TehranTehran11155-4563Iran Department of Civil engineering Arak University of TechnologyArak***Iran

In this study, average-interpolating radial basis functions (RBFs) are successfully integrated with central high-resolution schemes to achieve a higher-order central method. This proposed method is used for simulation of generalized coupled thermoelasticity problems including shock (singular) waves in their solutions. The thermoelasticity problems include the LS (systems with one relaxation parameter) and GN (systems without energy dissipation) theories with constant and variable coefficients. In the central high resolution formulation, RBFs lead to a reconstruction with the optimum recovery with minimized roughness on each cell: this is essential for oscillation-free reconstructions. To guarantee monotonic reconstructions at cell-edges, the nonlinear scaling limiters are used. Such reconstructions, finally, lead to the total variation bounded (TVB) feature. As RBFs work satisfactory on non-unifdrm cells/grids, the proposed central scheme can handle adapted cells/grids. To have cost effective and accurate simulations, the multiresolution-based grid adaptation approach is then integrated with the RBF-based central scheme. Effects of condition numbers of RBFs, computational complexity and cost of the proposed scheme are studied. Finally, different 1-D coupled thermoelasticity benchmarks are presented. There, perfonnance of the adaptive RBF-based formulation is compared with that of the adaptive Kurganov-Tadmor (KT) second-order central high-resolution scheme with the total variation diminishing (TVD) property.

关键词： central high resolution schemes RBFs higher order accuracy generalized thermoelasticity multiresolutionbased adaptation

TIDAL EFFECTS ON GROUNDWATER DYNAMICS IN COASTAL AQUI-FER UNDER DIFFERENT BEACH SLOPES

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 2012年第1期24卷 97-106页

作者： LIU Yi SHANG Song-hao MAO Xiao-min college of Water Conservancy and Civil EngineeringChina Agricultural UniversityBeijing 100083China State Key Laboratory of Hydroscicncc and engineering Department of Hydraulic EngineeringTsinghuaUniversityBeijing 100084China college of Water Conservancy and Civil engineering China Agricultural UniversityBeijing 100083China

The tide induced groundwater fluctuation and the seawater intrusion have important effects on hydrogeology and ecology of coastal *** previous studies,there were few quantitative evaluations of the joint effects of the beach slope and the tide fluctuation on the groundwater *** this article,a numerical model is built by using the software FEFLOW with consideration of seawater intrusion,tide effects,density dependent flow and beach sloping *** simulation results are validated by laboratory experimental data in *** numerical scenarios are designed in a practical scale with different beach *** show that the groundwater fluctuation decays exponentially with the distance to the beach,i.e.,,and our simulation further shows that the beach slope influence can be expressed in the form of a logarithm *** for the same location,the amplitude increases logarithmically with the beach angle in the form,where and are related with the horizontal distance（）in the form of a logarithm *** beach slope has no influence on the phase lag,although the latter increases regularly with the distance from the *** beach slope effect on the seawater intrusion is investigated through the quantitative relationship among the relative intrusion length（）,the relative enhancement of the tide induced seawater intrusion（）and the beach angle（）.It is shown that the tide effects on a milder beach is much greater than on a vertical one,and both λ and κ can be expressed in logarithm functions *** tidal effect on the flow field in the transition zone for a particular mild beach is also studied,with results showing that the tide induced fluctuation of is similar to the groundwater table fluctuation while shows a distinct variation along both directions.

关键词： tidal effects salt wedges saline intrusion beach slope finite element method