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Experimental study of a novel heat sink for distribution level static synchronous compensator cooling

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Science China(Technological Sciences) 2020年第9期63卷 1764-1775页

作者： chen hao LI Qiang MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EingineringNanjing University of Sciene&TechnologyNanjing 210094China

In this paper, a novel heat sink which coupling natural convection and phase transition was designed to meet the cooling requirements of distribution level static synchronous compensator(DSTATCOM). The two inclined evaporation substrates can meet the requirements for the parallel operation of DSTATCOM and the working medium R245 fa was driven by gravity and buoyancy in the heat sink. The influence of filling ratio and heating power on the thermal performance of the heat sink was investigated experimentally and theoretically. The experimental results showed that the filling ratio and heating power had a significant influence on the thermal performance of the heat sink. At the ambient temperature of 25℃, the heat sink could start up successfully at different heating power and filling ratio. Meanwhile, the heat sink achieved good heat dissipation performance as the maximum temperature of two evaporation substrates were 60.14℃ and 67.85℃ while the heating power was 3000 Wand the filling ratio was 80%. The heat transfer resistance between two evaporation substrates and condensation substrates were6.6×10^-3℃/W and 1.2×10^-2℃/W at the same working condition. Additionally, the experimental results showed a good agreement with the calculated results.

关键词： natural convection phase transition thermal performance maximum temperature heat transfer resistance

Seismic response characteristics of nuclear island structure at generic soil and rock sites

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 667-688页

作者： Lv hao chen Shaolin Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China College Resources Shandong University of Science and TechnologyTai’an 271019China

The number of traditionally excellent coastal lithologic nuclear power plants is *** is a trend to develop nuclear power plants on soil sites in inland ***,the seismic safety and adaptability of non-rock nuclear power plant(NPP)sites are the key concerns of nuclear safety *** the five site categories are clearly defined in the AP1000 design control documents,the effects of nuclear power five site conditions and soil nonlinearity on the seismic response characteristics of nuclear island buildings have not been systematically considered in previous related *** this study,targeting the AP1000 nuclear island structure as the research object,three-dimensional finite element models of a nuclear island structure at five types of sites(firm rock site(FR),soft rock site(SR),soft-to-medium soil site(SMS),upper bound soft-to-medium site(SMS-UB),and soft soil site(SS))are *** partitioned analysis method of soil-structure interaction(PASSI)in the time-domain is used to investigate the effects of site hardness and nonlinearity on the acceleration,displacement,and acceleration response spectrum of the nuclear island structure under seismic *** incremental equilibrium equation and explicit decoupling method are used to analyze the soil nonlinearity described by the Davidenkov model with simplified loading-reloading *** results show that,in the linear case,with the increase of site hardness,the peak ground acceleration(PGA)and the peak of acceleration response spectrum of the nuclear island structure increase except for the FR site,while the maximum displacement *** nonlinear analysis,as the site hardness increases,the PGA,maximum displacement,and the peak of acceleration response spectrum of the nuclear island structure *** peak value of the acceleration response spectrum in the nonlinear case is greater than that in the linear case for FR,while smaller for SR and soil *** site nonlinear

关键词： partitioned analysis for SSI site conditions nuclear structure explicit-implicit integration scheme incremental algorithm for nonlinear analysis

Construction of N,O co-doped carbon anchored with Co nanoparticles as efficient catalyst for furfural hydrodeoxygenation in ethanol

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Journal of Energy Chemistry 2023年第3期78卷 195-202,I0006页

作者： Hui Yang hao chen Wenhua Zhou haoan Fan chao chen Yixuan Sun Jiaji Zhang Sifan Wang Teng Guo Jie Fu Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina Institute of Zhejiang University-Quzhou Quzhou 324000ZhejiangChina College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082HunanChina

Hydrodeoxygenation of furfural(FF)into 2-methylfuran(MF)is a significant biomass utilization ***,designing efficient and stable non-noble metal catalyst is still a huge ***,we reported the N,O co-doped carbon anchored with Co nanoparticles(Co-SFB)synthesized by employing the organic ligands with the target ***,electron paramagnetic resonance(EPR),electrochemical impedance spectroscopy(EIS),and X-ray photoelectron spectroscopy(XPS)characterizations showed that the co-doping of N and O heteroatoms in the carbon support endows Co-SFB with enriched lone pair electrons,fast electron transfer ability,and strong metal-support *** electronic properties resulted in strong FF adsorption as well as lower apparent reaction activation *** last,the obtained N,O co-doped Co/C catalyst showed excellent catalytic activity(nearly 100 mol%FF conversion and 94.6 mol%MF yield)and stability for in-situ dehydrogenation of FF into *** N,O co-doping strategy for the synthesis of highly efficient catalytic materials with controllable electronic state will provide an excellent opportunity to better understand the structure-function relationship.

关键词： N,O co-doped carbon Electronic properties Furfural 2-Methylfuran In-situ hydrodeoxygenation

On Optical Polarons in One Dimensional Molecular-Crystal Chains

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Chinese Physics Letters 1996年第8期13卷 617-620页

作者： chen hao chen Yuan Department of Physics South China Normal UniversityGuangzhou 510631

An improved solution for the optical polarons in the molecular-crystal model with the dispersion term in one dimensional chains is *** approximation neglecting the dispersion term,the improved solution tends to usual ... 详细信息

关键词： solution dispersion polaron

Relationship between contact size and static friction:An approach for rigid crystalline surfaces

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Friction 2021年第3期9卷 502-512页

作者： hao chen Xinlei GAO School of Chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China

Relationship between contact size(A)and static friction(f)has been studied for rigid crystalline *** built a series of systems with two identical surfaces but different orientations and investigated the effects of the size and shape of the contact area on static *** these systems,there are numerous nontrivial commensurate *** results confirmed that the relationship between A and f was determined by both commensurability and shape of the *** commensurate contacts,f∝A independent of the *** incommensurate contacts,generally f∝A^(0) for regular shapes or f∝A^(1/4) for irregular shapes;however,in very few cases of regular shapes,f∝A^(1/2).Moreover,in above systems,commensurability of a contact can be easily changed by a perturbation of the misfit ***,if the perturbation caused by the lateral force and the deformation of the surface are considered(as is the case in real systems),further research is necessary.

关键词： static friction contact size numeric simulation rigid body

Fast algorithms for determining the linear complexities of sequences over GF(p^(m)）with the period 3n

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Science China Mathematics 2006年第5期49卷 715-720页

作者： chen hao Department of Computing and Information Technology Fudan University Shanghai 200433 China

In this paper, for the the primes p such that 3 is a divisor of p - 1, we prove a result which reduces the computation of the linear complexity of a sequence over GF(pm)(any positive integer m) with the period 3n (n and pm - 1 are coprime) to the computation of the linear complexities of three sequences with the period n. Combined with some known algorithms such as generalized Games-Chan algorithm, Berlekamp-Massey algorithm and Xiao-Wei-Lam-lmamura algorithm, we can determine the linear complexity of any sequence over GF(pm) with the period 3n (n and pm - 1 are coprime) more efficiently.

关键词： number theory of the finite field, cryptography, stream cipher, fast algorithm.

Restricted parameter range promise set cover problems are easy

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Frontiers of Mathematics in China 2014年第6期9卷 1253-1260页

作者： hao chen Department of Mathematics Hangzhou Dianzi University Hangzhou 310018 China

The restricted parameter range set cover problem is a weak form of the NP-hard set cover problem with the restricted range of parameters. We give a polynomial time algorithm for this problem by lattices.

关键词： Set cover problem lattice closest vector problem (CVP) shortestvector problem (SVP)

Exploiting optical degrees of freedom for information multiplexing in diffractive neural networks

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Light(Science & Applications) 2022年第8期11卷 1639-1642页

作者： chao Zuo Qian chen Smart Computational Imaging Laboratory(SCILab) School of Electronic and Optical EngineeringNanjing University of Science and Technology210094NanjingJiangsu ProvinceChina Smart Computational Imaging Research Institute(SCIRI)of Nanjing University of Science and Technology 210019NanjingJiangsu ProvinceChina Jiangsu Key Laboratory of Spectral Imaging&Intelligent Sense 210094NanjingJiangsu ProvinceChina

Exploiting internal degrees of freedom of light, such as polarization, provides efficient ways to scale the capacity of optical diffractive computing, which may ultimately lead to high-throughput, multifunctional all-... 详细信息

关键词： degrees optical networks

Improved vocal effort modeling by exploiting echo state network and radial basis function network

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The Journal of China Universities of Posts and Telecommunications 2019年第3期26卷 98-104页

作者： chao hao Dong Liang Liu Yongli School of Computer Science and Technology Henan Polytechnic University

The independent hypothesis between frames in vocal effect(VE) recognition makes it difficult for frame based spectral features to describe the intrinsic temporal correlation and dynamic change information in speech phenomena. A novel VE detection method based on echo state network(ESN) is proposed. The input sequences are mapped into a fixed-dimensionality vector in high dimensional coding space by reservoir of the ESN. Then, radial basis function(RBF) networks are employed to fit the probability density function(pdf) of each VE mode by using the vectors in the high dimensional coding space. Finally, the minimum error rate Bayesian decision is employed to judge the VE mode. The experiments which are conducted on isolated words test set achieve 79.5% average recognition accuracy, and the results show that the proposed method can overcome the defect of the independent hypothesis between frames effectively.

关键词： vocal effort echo state network reservoir radial basis function support vector machine