检索结果-南通市图书馆

Dynamics of high-frequency modulated waves in a nonlinear dissipative continuous bi-inductance network

Chinese Physics b 2021年第6期30卷 193-205页

作者： s M Ngounou F b Pelap Unitéde Recherche de Mécanique et de Modélisation des systèmes Physiques(UR-2 MsP) Facultédes SciencesUniversitéde DschangBP 69 DschangCameroun Unitéde Recherche de Matière Condensée d'Electronique et de Traitement du signal(UR-MACETs) Facultédes SciencesUniversitéde DschangBP 67 DschangCameroun

This paper presents intensive investigation of dynamics of high frequency nonlinear modulated excitations in a damped bimodal lattice. The effects of the dissipation are considered through a linear dissipation coefficient whose evolution in terms of the carrier wave frequency is checked. There appears that the dissipation coefficient increases with the carrier wave frequency. In the linear limit and for high frequency waves, study of the asymptotic behavior of plane waves reveals the existence of two additional regions in the dispersion curve where the modulational phenomenon is observed compared to the lossless line. based on the multiple scales method exploited in the continuum approximation using an appropriate decoupling ansatz for the voltage of the two different cells, it appears that the motion of modulated waves is described by a dissipative complex Ginzburg–Landau equation instead of a Korteweg–de Vries equation. We also show that this amplitude wave equation admits envelope and hole solitons in the high frequency mode. From basic sources, we design a programmable electronic generator of complex signals with desired characteristics, which delivers signals exploited as input waves for all our numerical simulations. These simulations are performed in the LTspice software that uses realistic components and give the results that corroborate perfectly our analytical predictions.

关键词： dissipative bi-inductance network high-frequency mode continuous approximation dissipative complex Ginzburg–Landau equation programmable electronic generator LT-Pspice observations

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

In depth fusion flame spreading with a deuterium-tritium plane fuel density profile for plasma block ignition

引用

Chinese Physics b 2012年第12期21卷 317-321页

作者： b.Malekynia s.s.Razavipour Department of Physics Gachsaran BranchIslamic Azad University

solid-state fuel ignition was given by Chu and bobin according to the hydrodynamic theory at x = 0 qualitatively. A high threshold energy flux density, i.e., E＊ = 4.3 × 10^12 J/m2, has been reached. Recently, fast ignition by employing clean petawatt-picosecond laser pulses was performed. The anomalous phenomena were observed to be based on suppression of prepulses. The accelerated plasma block was used to ignite deuterium tritium fuel at solid-state density. The detailed analysis of the thermonuclear wave propagation was investigated. Also the fusion conditions at x ≠ 0 layers were clarified by exactly solving hydrodynamic equations for plasma block ignition. In this paper, the applied physical mechanisms are determined for nonlinear force laser driven plasma blocks, thermonuclear reaction, heat transfer, electro,ion equilibration, stopping power of alpha particles, bremsstrahlung, expansion, density dependence, and fluid dynamics. New ignition conditions may be obtained by using temperature equations, including the density profile that is obtained by the continuity equation and expansion velocity. The density is only a function of x and independent of time. The ignition energy flux density, Et＊, for the x ≠ 0 layers is 1.95 × 1012 J/m2. Thus threshold ignition energy in comparison with that at x =0 layers would be reduced to less than 50 percent.

关键词： plasma block solid-state fuel ignition expansion

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

The internal propagation of fusion flame with the strong shock of a laser driven plasma block for advanced nuclear fuel ignition

引用

Chinese Physics b 2013年第5期22卷 369-374页

作者： b. Malekynia s. s. Razavipour Department of Physics Gachsaran BranchIslamic Azad University

An accelerated skin layer may be used to ignite solid state fuels. Detailed analyses were clarified by solving the hydrodynamic equations for nonlinear force driven plasma block ignition. In this paper, the complementary mechanisms are included for the advanced fuel ignition： external factors such as lasers, compression, shock waves, and sparks. The other category is created within the plasma fusion as reheating of an alpha particle, the bremsstrahlung absorption, expansion, conduction, and shock waves generated by explosions. With the new condition for the control of shock waves, the spherical deuterium-tritium fuel density should be increased to 75 times that of the solid state. The threshold ignition energy flux density for advanced fuel ignition may be obtained using temperature equations, including the ones for the density profile obtained through the continuity equation and the expansion velocity for the r≠ 0 layers. These thresholds are significantly reduced in comparison with the ignition thresholds at x = 0 for solid advanced fuels. The quantum correction for the collision frequency is applied in the case of the delay in ion heating. Under the shock wave condition, the spherical proton- boron and proton-lithium fuel densities should be increased to densities 120 and 180 times that of the solid state. These plasma compressions are achieved through a longer duration laser pulse or X-ray.

关键词： block ignition advanced fuel quantum correction shock wave

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

Linear Precoder Design for Correlated Rician Fading Channel Under Imperfect CsI

引用

China Communications 2023年第9期20卷 160-170页

作者： s.b.M.Priya school of Electrical and Electronics Engineering SASTRA Deemed UniversityThanjavur 613401India

In this paper,we have modeled a linear precoder for indoor multiuser multiple input multiple output(MU-MIMO)system with imperfect channel state information(CsI)at *** Rician channel is presumed to be mutually coupled and spatially,temporarily *** imperfection with CsI is primarily due to the channel estimation error at receiver and feedback delay amidst the receiver and transmitter in CsI *** with,the insufficient spacing between the antenna at transmitter and receiver persuades mutual coupling(MC)among the array *** addition,the MIMO channel is presumed to be jointly correlated(Weichselberger correlation model).When we look back on the existing precoder design,it considered spatial correlation alone disregarding joint correlation of antenna array *** all above assumption,we have designed a linear precoder which minimizes mean squared error(MsE)subjected to total transmit power constraint for MUMIMO *** simulation results proven that proposed precoder shows substantial enhancement in bit error rate(bER)performance in comparison with the existing *** mathematical analysis corroborates the simulation results.

关键词： channel estimation error feedback delay MMsE linear precoder mutual coupling spatial cor-relation Weichselberger correlation model

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

Equation of state for pure fluids at critical temperature

引用

Chinese Physics b 2012年第4期21卷 378-382页

作者： s. b. Khasare Department of Physics Science College Congress NagarNagpur-440010India

In this paper, we employ the concept of probability for creating a cavity with diameter d in fluid along with the perturbation and variation approach, and develop an equation of state （EOs） for a hard sphere （Hs） and Lennard Jones （L J） fluids. A suitable axiomatic form for surface tension s（r） is assumed for the pure fluid, with r as a variable. The function s（r） has an arbitrary parameter rn. s（r） = A ＋ b（d/r）/[1 ＋ m（d/r）]. We use the condition in terms of radial distribution function G（λd,η） containing the self-consistent parameter λ and the condition of continuity at r = d/2 to determine A and b. A different EOs can be obtained with a suitable choice of rn and the EOs has a lower root-mean-square deviation than that of barker-Henderson bH2 for LJ fluids.

关键词： equation of state Lenard Jones potential hard-sphere potential liquid mixture

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

Impact of La^(3+)substitution on electrical,magnetic,dielectric and optical properties of Ni_(0.7)Cu_(0.1)Zn_(0.2)LaxFe_(2-x)O_(4)(0system

引用

Journal of Rare Earths 2023年第5期41卷 740-746,I0004页

作者： b.b.Patil A.D.Pawar s.s.barate J.s.Ghodake J.b.Thorat T.J.shinde P.G.Department of Physics Smt.KRP Kanya MahavidyalayaIslampurMS415409India Department of Physics Shivaji UniversityKolhapurMS416004India Departments of Physics PDVP MahavidyalayaMahavidyalayaTasgaonMS416312India Department of Physics Sadguru Gadage Maharaj CollegeKaradMS415110

The oxalate co-precipitation method was used to synthesize the La3+substituted Ni-Cu-Zn(La-NCZ)nanoferrites having chemical composition Ni_(0.7)Cu_(0.1)Zn_(0.2)LaxFe_(2-x)O_(4)(x=0.015,0.025 and 0.035).DC resistivity study of nanoferrites shows both the conducting and semiconducting *** room temperature DC electrical resistivity of Ni-Cu-Zn(NCZ)nanoferrites decreases,whereas Curie temperature increases with increasing La^(3+)*** the temperature range of 30-170℃nanoferrites show p-type semiconducting behavior except x=0.015;thereafter,they show n-type *** frequency dispersive initial permeability(μi)associated with its real and imaginary(μ’andμ")parts are attributed to the domain wall movement and magnetic spin ***μi,u’andμ"of La-NCZ nanoferrites are higher than those of pure NCZ *** constant(ε’),dielectric loss(ε")and AC resistivity(ρAC)of La-NCZ nanoferrites show normal dielectric *** is found thatε’of NCZ nanoferrites decreases with the increasing content of La3+*** bandgap energy of La-NCZ nanoferrites is achieved in the range 1.36-1.70 eV confirming the semiconducting nature of materials.

关键词： Ni-Cu-La-Zn nanoferrites DC electrical Resistivity Permeability Dielectric properties bandgap energy 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

Recent application of jackfruit waste in food and material engineering:A review

引用

Food bioscience 2022年第4期48卷 252-262页

作者： s.b.Kalse s.b.swami Department of Agricultural Process Engineering College of Agricultural Engineering and TechnologyDapoli 415712Dist-RatnagiriMaharashtra StateDr.Balasaheb Sawant Konkan Krishi VidyapeethDapoliIndia Department of Post-Harvest Engineering Post Graduate Institute of Post-Harvest ManagementKilla-Roha402116Dist:RaigadMaharashtra StateDr.Balasaheb Sawant Konkan Krishi VidyapeethDapoliIndia

Jackfruit(Artocarpus heterophyllus Lam.)processing industries generate considerable amount of solid wastes in the form of peels,seeds and latex which leads environmental pollution these waste can be utilized as an attractive source for different sustainable *** has a potential and alternative source of commercial pectin,activated carbon preparation,adsorbent to remove the various harmful dyes and metal ions from aqueous water and also utilized as a sustainable fuel as a bio hydrogen,biogas and ethanol *** seed flour having potentiality to replace wheat flour(25-30%)in bakery industry and it can also use as substrate for the production of red pigments which can be used as colorant in textile industry also useful for the preparation of Fast Dissolving *** latex utilized as the cementing medium,irrigation solution,denture cleaning solution,resin and other future dental filling material used as cost effective ***-product recovery from jackfruit wastes not only can improve the overall economics of processing units but also reduce the problem of environmental pollution *** review demonstrates the potential utilization of jackfruit waste.

关键词： Jackfruit Waste utilization bio-energy Fast dissolve tablet Pectin

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

Merging bound states in the continuum in an open acoustic resonator

引用

science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： Lujun Huang bin Jia Artem s.Pilipchuk sibo Huang Chen shen Almas F.sadreev Yong Li Andrey E.Miroshnichenko school of Physics and Electronic sciences East China Normal University Institute of Acoustics Tongji University L.V.Kirensky Institute of Physics Department of Mechanical Engineering Rowan University school of Engineering and Technology University of New South Wales at Canberra

bound states in the continuum （bICs） are perfectly localized resonances despite embedding in the continuum ***,an isolated bIC is very sensitive to the structure ***,we report merging acoustic bICs in a single open resonator,robust against the structure *** find that both symmetry-protected bIC and Friedrich-Wintgen bIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two bICs move toward each other and merge into a single one at a critical *** to an individual bIC,the merged bIC is robust against fabrication error because its Q-factor is proportional to ΔL-4,whereΔL embodies the structure *** essence of this extraordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective nonHermitian ***,we present direct experimental demonstrations of the moving and merging of bICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of Fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and filters.

关键词： acoustic resonances bound state in the continuum high-Q resonances

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

study of Pulsed Plasma in a Crossed Flow Dielectric barrier Discharge Reactor for Improvement of NO_x Removal in Raw Diesel Engine Exhaust

引用

Plasma science and Technology 2011年第1期13卷 82-87页

作者： sankarsan MOHAPATRO b.s.RAJANIKANTH High Voltage Lab Indian Institute of Science

Improved performance of plasma in raw engine exhaust treatment is reported. A new type of reactor referred to as of cross-flow dielectric barrier discharge （DbD） was used, in which the gas flow is perpendicular to the corona electrode. In raw exhaust environment, the cross-flow （radial-flow） reactor exhibits a superior performance with regard to NOx removal when compared to that with axial flow of gas. Experiments were conducted at different flow rates ranging from 2 L/min to 25 L/min. The plasma assisted barrier discharge reactor has shown encouraging results in NOx removal at high flow rates.

关键词： electric discharges NOx removal, non-thermal plasma, raw diesel engine exhaust

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

Output only modal identification and structural damage detection using time frequency & wavelet techniques

引用

Earthquake Engineering and Engineering Vibration 2009年第4期8卷 583-605页

作者： s.Nagarajaiah b.basu Dept.of Civil & Environmental Eng.and Dept.of Mechanical Eng.& Material sc. Rice University Dept.of Civil Structural& Environmental Eng.Trinity College Dublin

The primary objective of this paper is to develop output only modal identification and structural damage detection. Identification of multi-degree of freedom （MDOF） linear time invariant （LTI） and linear time variant （LTV--due to damage） systems based on Time-frequency （TF） techniques--such as short-time Fourier transform （sTFT）, empirical mode decomposition （EMD）, and wavelets--is proposed. sTFT, EMD, and wavelet methods developed to date are reviewed in detail. In addition a Hilbert transform （HT） approach to determine frequency and damping is also presented. In this paper, sTFT, EMD, HT and wavelet techniques are developed for decomposition of free vibration response of MDOF systems into their modal components. Once the modal components are obtained, each one is processed using Hilbert transform to obtain the modal frequency and damping ratios. In addition, the ratio of modal components at different degrees of freedom facilitate determination of mode shape. In cases with output only modal identification using ambient/random response, the random decrement technique is used to obtain free vibration response. The advantage of TF techniques is that they arc signal based; hence, can be used for output only modal identification. A three degree of freedom 1：10 scale model test structure is used to validate the proposed output only modal identification techniques based on sTFT, EMD, HT, wavelets. both measured free vibration and forced vibration （white noise） response are considered. The secondary objective of this paper is to show the relative ease with which the TF techniques can be used for modal identification and their potential for real world applications where output only identification is essential. Recorded ambient vibration data processed using techniques such as the random decrement technique can be used to obtain the free vibration response, so that further processing using TF based modal identification can be performed.

关键词： Time-frequency methods short time Fourier transform Hilbert transform wavelets modal identification:output only structural health monitoring damage detection

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：