检索结果-南通市图书馆

Fabrication and evaluation of high-performance 3D interpenetrated network structures SiC/Al composites with high-purity plate-like a-SiC framework

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2024年第2期10卷 499-510页

作者： Jiawei Xie Jinhui Zou Liangcheng Tong Syieluing wong Xin Guo hang Qin Pengzhao Gao Wenming Guo Hanning Xiao College of Materials Science and Engineering Hunan UniversityChangsha410082China Department of Chemical Engineering and Chemistry Eindhoven University of TechnologyEindhoven5612 AZNetherlands College of Automation and Information Engineering Xi'an University of TechnologyXi'an710048China

To reinforce compatibility with the thermophysical and mechanical properties of SiC/Al composites for electronic packaging to improve the stability and reduce fatigue failure of electronic integrated devices,a novel 3D SiC reinforced framework with interpenetrated plate-like a-SiC grains was synthesized.A small amount of doped a-SiC was seeded to induce the transformation of b-SiC to plate-like a-SiC at 2,300℃,forming a high-purity a-SiC strongly bonded ***/gas pressure infiltration of Al alloy was subsequently used to manufacture the 3D interpenetrated network structure SiC/Al(SiC3D/Al)*** results showed that 15%(in mass)seeds provided the composite with the optimal comprehensive performance,including a low coefficient of thermal expansion(CTE)of 5.54×10^(-6)K^(-1),a high thermal conductivity(l)of 239.08 W·m^(-1)·K^(-1),the highest flexural strength of 326.84 MPa,and a low thermal deformation parameter(TDP)of ***-purity plate-like grains enhanced the purity of the framework promoting a significant improvement in *** the seed content increased to 20%(in mass),both CTE and l reached optimal values of 5.22×10^(-6)K^(-1)and 243.14 W·m^(-1)·K^(-1),but the mechanical properties declined by 10.30%.The synergistic effect of the well-bonded interface and the high-purity 3D SiC framework balanced excellent mechanical properties and multiple thermal functions.

关键词： α-SiC seed Phase transformation Thermophysical properties SiC_(3D)/Al composites Electronic packaging

Over 18.2%efficiency of layer–by–layer all–polymer solar cells enabled by homoleptic iridium(Ⅲ)carbene complex as solid additive

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

Science Bulletin 2024年第18期69卷 2862-2869页

作者： hang Zhou Yingjie Sun Miao Zhang Yuheng Ni Fenghua Zhang Sang Young Jeong Tianhuan Huang Xiong Li Han Young Woo Jian Zhang Wai-Yeung wong Xiaoling Ma Fujun Zhang Key Laboratory of Luminescence and Optical Information(Ministry of Education) Beijing Jiaotong UniversityBeijing 100044China Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHong Kong 999077China Department of Physics Beijing Technology and Business UniversityBeijing 100048China Organic Optoelectronic Materials Laboratory Department of ChemistryCollege of ScienceKorea UniversitySeoul 02841Republic of Korea School of Materials Science and Engineering Engineering Research Center of Electronic Information Materials and DevicesMinistry of EducationGuangxi Key Laboratory of Information MaterialsGuilin University of Electronic TechnologyGuilin 541004China Tangshan Research Institute of Beijing Jiaotong University Tangshan 063000China

The vertical phase distribution of active layers plays a vital role in balancing exciton dissociation and cha rge transport for achieving efficient polymer solar cells(PSCs).The layer-by-layer(LbL)PSCs are commonly prepared by using sequential spin-coating method from donor and acceptor solutions with distinct solvents and solvent *** enhanced exciton dissociation is expected in the LbL PSCs with efficient charge transport in the relatively neat donor or acceptor *** this work,a series of LbL all-polymer solar cells(APSCs)were fabricated with PM6 as donor and PY-DT as acceptor,and triplet material m-Ir(CPmPB)_(3)is deliberately incorporated into PY-DT layer to prolong exciton lifetimes of active *** power conversion efficiency(PCE)of LbL APSCs is improved to 18.24%from 17.32%by incorporating 0.3 wt%m-Ir(CPMPB)_(3)in PY-DT layer,benefiting from the simultaneously enhanced short-circuit current density(Isc)of 25.17 mA cm^(-2)and fill factor(FF)of 74.70%.The enhancement of PCE is attributed to the efficient energy transfer of m-Ir(CPmPB)_(3)to PM6 and PY-DT,resulting in the prolonged exciton lifetime in the active layer and the increased exciton diffusion *** efficient energy transfer from m-Ir(CPmPB)_(3)to PM6 and PY-DT layer can be confirmed by the increased photoluminescence(PL)intensity and the prolonged PL lifetime of PM6 and PY-DT in PM6+m-Ir(CPmPB)_(3)and PY-DT+m-Ir(CPmPB)_(3)*** study indicates that the triplet material as solid additive has great potential in fabricating efficient LbL APSCs by prolonging exciton lifetimes in active layers.

关键词： Layer-by-layer All-polymer solar cells Additive strategy Triplet material Energy transfer

Magnetic field regression using artificial neural networks for cold atom experiments

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第2期33卷 46-51页

作者：陈子霆黃建陶 Bojeong Seo 黄明琛 Mithilesh K.Parit 何逸飞甄浩廷 Jensen Li Gyu-Boong Jo Department of Physics The Hong Kong University of Science and TechnologyKowloon 999077China

Accurately measuring magnetic fields is essential for magnetic-field sensitive experiments in areas like atomic,molecular,and optical physics,condensed matter experiments,and other ***,since many experiments are often conducted in an isolated environment that is inaccessible to experimentalists,it can be challenging to accurately determine the magnetic field at the target ***,we propose an efficient method for detecting magnetic fields with the assistance of an artificial neural network(NN).Instead of measuring the magnetic field directly at the desired location,we detect fields at several surrounding positions,and a trained NN can accurately predict the magnetic field at the target *** training,we achieve a below 0.3%relative prediction error of magnetic field magnitude at the center of the vacuum chamber,and successfully apply this method to our erbium quantum gas apparatus for accurate calibration of magnetic field and long-term monitoring of environmental stray magnetic *** demonstrated approach significantly simplifies the process of determining magnetic fields in isolated environments and can be applied to various research fields across a wide range of magnetic field magnitudes.

关键词： ultracold gases trapped gases measurement methods and instrumentation

Deep residual learning for denoising Monte Carlo renderings

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2019年第3期5卷 239-255页

作者： kin-Ming wong Tien-Tsin wong Artixels Hong Kong S.A.R.China Department of Computer Science and Engineering the Chinese University of Hong KongHong Kong S.A.R.China

Learning-based techniques have recently been shown to be effective for denoising Monte Carlo rendering methods. However, there remains a quality gap to state-of-the-art handcrafted denoisers. In this paper, we propose a deep residual learning based method that outperforms both state-of-the-art handcrafted denoisers and learning-based *** the indirect nature of existing learning-based methods(which e.g., estimate the parameters and kernel weights of an explicit feature based filter), we directly map the noisy input pixels to the smoothed output. Using this direct mapping formulation, we demonstrate that even a simple-and-standard ResNet and three common auxiliary features(depth, normal,and albedo) are sufficient to achieve high-quality denoising. This minimal requirement on auxiliary data simplifies both training and integration of our method into most production rendering pipelines. We have evaluated our method on unseen images created by a different renderer. Consistently superior quality denoising is obtained in all cases.

关键词： Monte Carlo rendering denoising deep learning deep residual learning filter-free denoising

Review of Feynman’s Path Integral in Quantum Statistics:from the Molecular Schrödinger Equation to Kleinert’s Variational Perturbation Theory

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2014年第4期15卷 853-894页

作者： kin-Yiu wong Department of Physics High Performance Cluster Computing CentreInstitute of Computational and Theoretical StudiesHong Kong Baptist University224 Waterloo RoadKowloon TongHong Kong Institute of Research and Continuing Education Hong Kong Baptist University(Shenzhen)

Feynman’s path integral reformulates the quantum Schrödinger differential equation to be an integral *** has been being widely used to compute internuclear quantum-statistical effects on many-body molecular *** this Review,the molecular Schrödinger equation will first be introduced,together with the BornOppenheimer approximation that decouples electronic and internuclear *** effective semiclassical potentials,e.g.,centroid potential,which are all formulated in terms of Feynman’s path integral,will be discussed and *** semiclassical potentials can be used to directly calculate the quantum canonical partition function without individual Schrödinger’s energy *** a result,path integrations are conventionally performed with Monte Carlo and molecular dynamics sampling *** complement these techniques,we will examine how Kleinert’s variational perturbation(KP)theory can provide a complete theoretical foundation for developing non-sampling/non-stochastic methods to systematically calculate centroid *** enable the powerful KP theory to be practical for many-body molecular systems,we have proposed a new path-integral method:automated integrationfree path-integral(AIF-PI)*** to the integration-free and computationally inexpensive characteristics of our AIF-PI method,we have used it to perform ab initio path-integral calculations of kinetic isotope effects on proton-transfer and RNA-related phosphoryl-transfer chemical *** computational procedure of using our AIF-PI method,along with the features of our new centroid path-integral theory at the minimum of the absolute-zero energy(AMAZE),are also highlighted in this review.

关键词： Feynman’s path integral Kleinert’s variational perturbation theory Schrödinger’s equation quantum statistics centroid potential energy quantum tunneling zero-point energy isotope effects

Assessing cypermethrin-contaminated soil with three different earthworm test methods

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 Environmental Sciences 2008年第11期20卷 1381-1385页

作者： wong hang Gi Michelle Laboratory for Conservation and Utilization of Bio-Resource and School of Life Science Yunnan UniversityKunming 650091China

A series of tests (lethal,sublethal,and behavioral) on earthworms were conducted as an eco-assessment of *** this study,the toxicity of cypermethrin-contaminating soil on adult and juvenile earthworms was *** the acute and chronic tests,an avoidance response test was carried *** was shown that the all-round toxicity from cypermethrin was weak on adult *** with adult earthworms,the toxicity of juvenile earthworms from cypermethrin especially chronic toxicity increased...

关键词： earthworms pesticide cypermethrin survival fecundity avoidance response environment disrupting chemicals

DYNAMIC MODEL AND SIMULATION OF A NOVEL ELECTRO-HYDRAULIC FULLY VARIABLE VALVE SYSTEM FOR FOUR-STROKE AUTOMOTIVE ENGINES

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2007年第5期20卷 80-86页

作者： wong Pak-kin TAM Lap-mou LI Ke Department of Electromechanical Engineering Faculty of Science and Technology University of Macao Macao China

In modem four-stroke engine technology, variable valve timing and lift control offers potential benefits for making a high-performance engine. A novel electro-hydraulic fully variable valve train for four-stroke automotive engines is introduced. The construction of the nonlinear mathematic model of the valve train system and its dynamic analysis are also presented. Experimental and simulation results show that the novel electro-hydraulic valve train can achieve fully variable valve timing and lift control. Consequently the engine performance on different loads and speeds will be significantly increased. The technology also permits the elimination of the traditional throttle valve in the gasoline engines and increases engine design flexibility.

关键词： Fully variable engine valve train Dynamic model Simulation

Small molecule deoxynyboquinone triggers alkylation and ubiquitination of Keap1 at Cys489 on Kelch domain for Nrf2 activation and inflammatory therapy

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2024年第3期14卷 401-415页

作者： Ke-Gang Linghu Tian Zhang Guang-Tao Zhang Peng Lv Wen-Jun Zhang Guan-Ding Zhao Shi-hang Xiong Qiu-Shuo Ma Ming-Ming Zhao Meiwan Chen Yuan-Jia Hu Chang-Sheng Zhang Hua Yu State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao SARChina Macao Centre for Research and Development in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao SARChina Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Key Laboratory of Marine Materia MedicaRNAM Center for Marine MicrobiologySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China State Key Laboratory of Functions and Applications of Medicinal Plants&School of Pharmaceutical Sciences Guizhou Medical UniversityGuiyang550025China

Activation of nuclear factor erythroid 2-related factor 2(Nrf2)by Kelch-like ECH-associated protein 1(Keap1)alkylation plays a central role in anti-inflammatory ***,activators of Nrf2 through alkylation of Keap1-Kelch domain have not been ***(DNQ)is a natural small molecule discovered from marine *** current study was designed to investigate the anti-inflammatory effects and molecular mechanisms of DNQ via alkylation of *** exhibited significant anti-inflammatory properties both in vitro and in *** pharmacophore responsible for the anti-inflammatory properties of DNQ was determined to be theα,β-unsaturated amides moieties by a chemical reaction between DNQ and *** exerted anti-inflammatory effects through activation of Nrf2/ARE ***1 was demonstrated to be the direct target of DNQ and bound with DNQ through conjugate addition reaction involving *** specific alkylation site of DNQ on Keap1 for Nrf2 activation was elucidated with a synthesized probe in conjunction with liquid chromatography-tandem mass *** triggered the ubiquitination and subsequent degradation of Keap1 by alkylation of the cysteine residue 489(Cys489)on Keap1-Kelch domain,ultimately enabling the activation of *** findings revealed that DNQ exhibited potent anti-inflammatory capacity throughα,β-unsaturated amides moieties active group which specifically activated Nrf2 signal pathway via alkylation/ubiquitination of Keap1-Kelch domain,suggesting the potential values of targeting Cys489 on Keap1-Kelch domain by DNQ-like small molecules in inflammatory therapies.

关键词： Deoxynyboquinone Anti-inflammation Target Keap1/Nrf2 Alkylation Ubiquitination

Sampled-Data Asynchronous Fuzzy Output Feedback Control for Active Suspension Systems in Restricted Frequency Domain

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

IEEE/CAA Journal of Automatica Sinica 2021年第5期8卷 1052-1066页

作者： Wenfeng Li Zhengchao Xie Yucong Cao Pak kin wong Jing Zhao the School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China the Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of TechnologyGuangzhou 510641China the Automotive Engineering Institute Guangzhou Automotive Group CompanyLtd.Guangzhou 510640China the Department of Electromechanical Engineering University of MacaoMacaoChina

This paper proposes a novel sampled-data asynchronous fuzzy output feedback control approach for active suspension systems in restricted frequency *** order to better investigate uncertain suspension dynamics,the sampleddata Takagi-Sugeno(T-S)fuzzy half-car active suspension(HCAS)system is considered,which is further modelled as a continuous system with an input ***,considering that the fuzzy system and the fuzzy controller cannot share the identical premises due to the existence of input delay,a reconstructed method is employed to synchronize the time scales of membership functions between the fuzzy controller and the fuzzy ***,since external disturbances often belong to a restricted frequency range,a finite frequency control criterion is presented for control synthesis to reduce ***,given a full information of state variables is hardly available in practical suspension systems,a two-stage method is proposed to calculate the static output feedback control ***,an iterative algorithm is proposed to compute the optimum ***,numerical simulations verify the effectiveness of the proposed controllers.

关键词： Active suspension asynchronous constraints output feedback restricted frequency domain sampled-data control Takagi-Sugeno(T-S)fuzzy