检索结果-南通市图书馆

An efficient cross-layer buffer management optimization scheme for 5G protocol stack

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

High Technology Letters 2022年第4期28卷 384-391页

作者： yang Xining ZHOU Yiqing chen yang Institute of Computing Technology Chinese Academy of SciencesBeijing 100083P.R.China School of Computer Science and Technology University of Chinese Academy of ScienceBeijing 100190P.R.China

It is extremely challenging for the 5G User Equipment(UE)to meet the requirement of low-latency data transmission with higher achievable data *** user plane processing of 5G protocol stack(PS)is one of the dominating components for end-to-end data transmission in the network *** this paper,a cross-layer buffer management scheme(CLBM)is *** adopts a zero-copy technique for protocol data unit(PDU)processing between protocol layers and allows to improve the memory operation efficiency significantly with reduced processing latency and CPU ***,the PS performance profiling(PSperf)tool,a general evaluation framework for the performance measurement and analysis of PS,is implemented based on the OpenAirInterface(OAI)5G *** evaluation result shows that compared with the PS of OAI the CLBM strategy reduces the CPU usage of RLC,PDCP,and MAC layer processing significantly up to 20.6%,63.4%,and 38.8%,*** result,the processing delay of the whole user plane of PS also has been reduced distinctly at various offered traffic load.

关键词： cross-layer optimization 5G protocol stack evaluation framework OpenAirInterface(OAI)

Photothermal catalysts for efficient and clean fuel production at atmospheric pressure

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1762-1764页

作者： Xinwei Guan yang chen Tianyi Ma School of Science RMIT UniversityMelbourneVIC3000Australia Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning ProvinceCollege of ChemistryLiaoning UniversityShenyang110036China

The use of waste carbon resources to produce valuable chemicals and hydrocarbon fuels has attracted great interest in recent *** a transformation not only maximises the utilisation of carbon resources but also plays a... 详细信息

关键词： thermal transformation clean

Distribution Changes of Chinese Skink(Eumeces chinensis) in China: the Impacts of Global Climate Change

在线全文

学校读者我要写书评

暂无评论

Asian Herpetological Research 2020年第2期11卷 132-138页

作者： chen yang Songhua TANG Zhenhua LUO chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041SichuanChina Institute of Zoology Chinese Academy of SciencesBeijing 100101China Molecular and Behavioral Ecology Research Group School of Life SciencesCentral China Normal UniversityWuhan 430079HubeiChina

Repaid global climate changes in temperature and rainfall influence the species distribution and diversity *** skink is a common species with large population and widely distribution in *** access potential effect of climate changes on the unendangered species,we used the maximum-entropy modeling(MaxEnt)method to estimate the current and future potential distributions of Chinese *** were based on two periods(2050 and 2070),three general circulation models(GCMs:BCC-CSM1-1,HadGEM2-ES,MIROC5),four representative concentration pathways(RCP:2.6,4.5,6.0 and 8.0)and 28 environmental variables including topography,human impact,bio-climate and *** found that the model were better fit with high values in AUC,KAPPA and *** jackknife tests showed that variables of BIO9,BIO14,BIO15,HFI and GDP were relatively higher contributions to the *** the size of suitable areas for skink have less effect by future climate change under full and mull dispersal hypothesis,we should still focuse on the effect of human impact and climate changes on the protection and management for Chinese skink due to the variables uncertainty.

关键词： climate change MaxEnt prediction species distribution model unendangered species

Tailoring Optical and Plasmon Resonances in Core-shell and Core-multishell Nanowires for Visible Range Negative Refraction and Plasmonic Light Harvesting:A Review

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第6期31卷 533-541页

作者： Sarath Ramadurgam Tzu-Ging Lin chen yang Department of Physics and Astronomy Purdue University Department of Chemistry Purdue University

Semiconductor nanowires(NWs) are sub-wavelength structures which exhibit strong optical(Mie)resonances in the visible *** addition to such optical resonances,the localized surface plasmon resonances(LSPRs) in metal-semiconductor core-shell(CS) and core-multishell(CMS) NWs can be tailored to achieve novel negative-index metamaterials(N1M),extreme absorbers,invisibility cloaks and ***,in this review,we focus on our recent theoretical studies which highlight the versatility of CS and CMS NWs for:1) the design of negative-index metamaterials in the visible range and2) plasmonic light harvesting in ultrathin photocatalyst layers for water *** the LSPR in the metal layer and the magnetic dipole(Mie) resonance in the semiconductor shell under transverse electric(TE) polarization,semiconductor-metal-semiconductor CMS NWs can be designed to exhibit spectrally overlapping electric and magnetic resonances in the visible *** exhibiting such double resonances can be considered as meta-atoms and arrayed to form polarization dependent,low-loss ***,by tuning the LSPR in the TE polarization and the optical resonance in the transverse magnetic(TM) polarization of metal-photocatalyst CS and semiconductor-metal-photocatalyst CMS NWs,the absorption within ultrathin(sub-50 nm) photocatalyst layers can be substantially ***,aluminum and copper based NWs provide absorption enhancement remarkably close to silver and gold based NWs,***,such absorption is polarization independent and remains high over a large range of incidence angles and permittivity of the ***,due to the tunability of their optical properties,CS and CMS NWs are expected to be vital components for the design of nanophotonic devices.

关键词： Nanowires Core-shell Core-multishell Negative refr

Study of engine noise based on independent component analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 772-777页

作者： HAO Zhi-yong JIN Yan yang chen School of Mechanical and Energy Engineering Zhejiang University Hangzhou 310027 China

Independent component analysis was applied to analyze the acoustic signals from diesel engine. First the basic prin-ciple of independent component analysis (ICA) was reviewed. Diesel engine acoustic signal was decomposed into several inde-pendent components (ICs); Fourier transform and continuous wavelet transform (CWT) were applied to analyze the independent components. Different noise sources of the diesel engine were separated, based on the characteristics of different component in time-frequency domain.

关键词： Acoustic signals Independent component analysis (ICA) Wavelet transform Noise source identification

Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite InxGa1-xN/GaN nanostructures

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第8期29卷 479-484页

作者： Xiao-chen yang Yan Xing School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021China

The linear and nonlinear optical absorption coefficients(ACs)and refraction index changes(RICs)of 1s-1p,1p-1d,and 1f-1d transitions are investigated in a wurtzite InxGa1-xN/GaN core-shell quantum dot(CSQD)with donor impurity by using density matrix *** effects of built-in electric field(BEF),ternary mixed crystal(TMC),impurity,and CSQD size are studied in *** finite element method is used to calculate the ground and excited energy state energy and wave *** results reveal that the BEF has a great influence on the linear,nonlinear,and total ACs and *** presence of impurity leads the resonant peaks of the ACs and RICs to be blue-shifted for all transitions,especially for 1s-1p *** is also found that the resonant peaks of the ACs and RICs present a red shift with In-composition decreasing or core radius ***,the amplitudes of the ACs and RICs are strongly affected by the incident optical *** absorption saturation is more sensitive without the impurity than with the impurity,and the appearance of absorption saturation requires a larger incident optical intensity when considering the BEF.

关键词： core-shell quantum dot linear and nonlinear optical properties impurity ternary mixed crystal

Silver recovery as Ag^0 nanoparticles from ion-exchange regenerant solution using electrolysis

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第4期31卷 161-173页

作者： Tabish Nawaz Sukalyan Sengupta chen-Lu yang Civil and Environmental Engineering Department University of Massachusetts Dartmouth Center for Innovation and Entrepreneurship University of Massachusetts Dartmouth

Many silver(Ag)containing consumer-products(***)release Ag into the environment,posing ecotoxicological *** recovery mitigates environmental hazards,recycles Ag,and leads to *** the present work,Ag has been recovered as Ag^0nanoparticles from the spent solution(thiourea(TU)～0.5 mol/L pH～1.1–1.2,and Ag～550 mg/L)obtained from the regeneration of an Ag-loaded resin using a simple undivided electrolytic *** reclaimed regenerant solution has been recycled and reused in a closed-loop scheme over multiple *** process parameters,i.e.,current(0.05 A)and stirring speed(600 r/min),have been optimized for Ag recovery of～94%and TU loss of～2%.The reclaimed regenerant solution has been shown to regenerate Ag-loaded resin samples with>90%regeneration efficiency over 4 cycles of consecutive extraction and *** recovered Ag^0nanoparticles are monodisperse,consistently spherical in shape,and have a mean diameter of～6 nm with standard deviation of the Gaussian fit as～2.66 nm.

关键词： Silver recovery Ag^0 nanoparticles Waste management Thiourea Sustainability Resource recovery Electrowinning

Some limit results on supremum of Shepp statistics for fractional Brownian motion

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2016年第3期31卷 269-282页

作者： TAN Zhong-quan chen yang School of Mathematical Sciences Zhejiang University College of Mathematics Physics and Information Engineering Jiaxing University School of Mathematics and Physics Suzhou University of Science and Technology

Define the incremental fractional Brownian field ZH（τ, s） = BH（s＋τ） -BH（s）,where BH（s） is a standard fractional Brownian motion with Hurst parameter H ∈ （0, 1）. Inthis paper, we first derive an exact asymptotic of distribution of the maximum MH（Tu） =supτ∈[0,1],s∈[0,xτu] ZH（τ, s）, which holds uniformly for x ∈ [A, B] with A, B two positive con-stants. We apply the findings to analyse the tail asymptotic and limit theorem of MH （τ） witha random index τ. In the end, we also prove an almost sure limit theorem for the maximum M1/2（τ） with non-random index T.

关键词： Extremes Shepp statistics fractional Brownian motion exact asymptotic almost sure limit theorem

Numerical simulation study on penetration performance of depleted Uranium(DU)alloy fragments

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第1期17卷 50-55页

作者： Fu-lin Zhu yang chen Gui-li Zhu Sichuan Aerospace System Engineering Institute Chengdu610100SichuanChina

Due to its high strength,high density,high hardness and good penetration capabilities,Depleted uranium alloys have already shined in armor-piercing *** should also be a lot of room for improvement in the application of fragment killing ***,regarding the performance of the depleted uranium alloy to penetrate the target plate,further investigation is needed to analyze its advantages and disadvantages compared to tungsten *** study the difference in penetration performance between depleted uranium alloy and tungsten alloy fragments,firstly,a theoretical analysis of the adiabatic shear sensitivity of DU and tungsten alloys was given from the perspective of material constitutive ***,taking the cylindrical fragment penetration target as the research object,the penetration process and velocity characteristics of the steel target plates penetrated by DU alloy fragment and tungsten alloy fragment were compared and analyzed,by using finite element software ANSYS/LS-DYNA and Lagrange ***,the influence of different postures when impacting target and different fragment shapes on the penetration results is carried out in the *** results show that in the penetration process of the DU and tungsten alloy fragments,the self-sharpening properties of the DU alloy can make the fragment head sharper and the penetrating ability *** the same conditions,the penetration capability of cylindrical fragment impacting target in vertical posture is better than that in horizontal posture,and the penetration capability of the spherical fragment is slightly better than that of cylindrical fragment.

关键词： Depleted uranium alloy Constitutive model Adiabatic shear Penetration performance Numerical simulation