检索结果-南通市图书馆

Fermions dynamic equation with Lorentz invariance violation and the corrected Hawking temperature in arbitrarily accelerating black hole

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2023年第11期75卷 84-91页

作者： Xia Tan jie Zhang Ran Li shu-Zheng Yang College of Physics and Electronic Engineering Qilu Normal UniversityJinan 250200China College of Physics and Astronomy China West Normal UniversityNanchong 637002China

Containing Lorentz invariance violation(LIV),a new form of the fermions dynamic equation under the background of the curved space-time of the arbitrarily accelerating black hole,is ***,we consider the new form of the fermions dynamic equation with arbitrary spin containing LIV in curved space-time,and research the fermions dynamic equation with spin-1/2containing *** this basis,according to the semi-classical theory and black hole quantum tunneling radiation theory,the quantum tunneling radiation of the arbitrarily accelerating Kinnersly black hole is modified correctly,and the corrected physical quantities such as black hole temperature and quantum tunneling rate are deeply *** fermions dynamic equation with arbitrary spin in the arbitrarily accelerating black hole space-time and its solution are explained in *** order to further obtain the correction effect of the Planck scale,this article considers beyond the semi-classical theory and further obtains new expressions of the black hole temperature and tunneling radiation rate.

关键词： arbitrarily accelerating black hole tunneling radiation Lorentz invariance violation

Unveiling thermal properties and pump-out blocking in diamond/GaInSn composites as thermal interface materials

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第12期42卷 3969-3976页

作者： Shi-jie Du Hong Guo Zhong-Nan Xie jie Zhang shu-Hui huang Nan Wu Xu-Jun Mi Xin-Bo He Hui Yang Yu-Lin Liu State Key Laboratory of Nonferrous Metals and Processes China GRINM Group Co.LtdBeijing 100088China Institute for Advanced Materials and Technology University of Science and TechnologyBeijing 100083China GRIMAT Engineering Institute Co. LtdBeijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

Gallium-based liquid metal,as a high-performance thermal interface material,can improve the performance and service life of electronic *** study focuses on the use of diamond as a thermal conductivity enhancement phase to improve the thermal conductivity of GaInSn liquid metal and avoid the overflow of liquid metal during *** this study,diamond/GaInSn composites were prepared by an ultrasonic-assisted wetting *** thermal conductivity and contact thermal resistance of diamond/GaInSn composites were characterized by the transient *** morphology and thermal conductivity of diamond/GalnSn composites were investigated when diamond particles of different diameters were added to GaInSn liquid *** addition of large-sized diamond particles can effectively improve the thermal conductivity of thermal interface materials (TIMs) but willcause liquid metal to pump out.

关键词： composites thermal interface

End-to-end data-driven modeling framework for automated and trustworthy short-term building energy load forecasting

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2024年第8期17卷 1419-1437页

作者： Chaobo Zhang jie Lu Jiahua huang Yang Zhao Department of the Built Environment Eindhoven University of TechnologyEindhovenThe Netherlands Energy Efficient Cities Initiative Department of EngineeringUniversity of CambridgeCambridgeUK Institute of Refrigeration and Cryogenics Zhejiang UniversityHangzhouChina Institute of Green Building and Engineering Design Zhejiang Province Institute of Architectural Design and Research Co.Ltd.HangzhouChina Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province Jiaxing Research InstituteZhejiang UniversityJiaxingChina

Conventional automated machine learning(AutoML)technologies fall short in preprocessing low-quality raw data and adapting to varying indoor and outdoor environments,leading to accuracy reduction in forecasting short-term building energy ***,their predictions are not transparent because of their black box ***,the building field currently lacks an AutoML framework capable of data quality enhancement,environment self-adaptation,and model *** address this research gap,an improved AutoML-based end-to-end data-driven modeling framework is *** optimization is applied by this framework to find an optimal data preprocessing process for quality improvement of raw *** bridges the gap where conventional AutoML technologies cannot automatically handle missing data and outliers.A sliding window-based model retraining strategy is utilized to achieve environment self-adaptation,contributing to the accuracy enhancement of AutoML ***,a local interpretable model-agnostic explanations-based approach is developed to interpret predictions made by the improved *** overcomes the poor interpretability of conventional AutoML *** performance of the improved framework in forecasting one-hour ahead cooling loads is evaluated using two-year operational data from a real *** is discovered that the accuracy of the improved framework increases by 4.24%–8.79%compared with four conventional frameworks for buildings with not only high-quality but also low-quality operational ***,it is demonstrated that the developed model interpretation approach can effectively explain the predictions of the improved *** improved framework offers a novel perspective on creating accurate and reliable AutoML frameworks tailored to building energy load prediction tasks and other similar tasks.

关键词： building energy load forecasting end-to-end data-driven modeling automated machine learning Bayesian optimization model retraining model interpretation

THE THIXOTROPY-LOOP BEHAVIORS OF AN LDPE MELT:EXPERIMENT AND SIMPLE ANALYSIS

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 2006年第6期18卷 666-675页

作者： huang shu-xin LU Chuan-jing Department of Engineering Mechanics Shanghai Jiaotong University Shanghai 200030 China

The time-dependent viscoelastic behaviors of an Low-Density-Pdyethyene（LDPE）（PE-FSB-23D022） melt were experimentally investigated using two types of thixotropy-loop test i.e., the triangular- and the trapezoidal-loop shear test. The shear strengthening was noted in the thixotropy-loop tests not only at high shear rate but also at low shear rate, and it was found that the dimensionless stress amplitude of shear strengthening at low shear rate is larger than that at high shear rate. Moreover, the shear strengthening is a time-dependent viscoelastic behavior that is observed during the initial stage of shearing, and it cannot be found when the time interval corresponding to the increase in shear rate is sufficiently long, The remarkable shear-weakening phenomenon was noticed at higher shear rate when shearing time is prolonged. Five types of the triangular thixotropy-loop results were marked in terms of the configurations of the stress-rate curves, which indicate the complex features of the time-dependent viscoelasticity. A simple model was used to describe the thixotropy-loop tests, and the fitted results showed good agreement with the experimental results.

关键词： thixotropy-loop test time-dependent viscoelasticity LDPE shear strengthening shear weakening

Sugarcane derived carbon@CuS-octadecanol composite phase change materials for efficient solar thermal storage

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2024年第4期34卷 803-813页

作者： shu-Yao Li Ying-jie Huo Ting Yan Wei-Guo Pan College of Energy and Mechanical Engineering Shanghai University of Electric Power Key Laboratory of Clean Power Generation and Environmental Protection Technology in Mechanical Industry

Biomass carbon has the advantage of a wide spectral absorption range, which makes it great potential for solar thermal utilization. In this study, porous skeleton support materials of sugarcane-derived carbon were prepared by freeze-drying-high-temperature carbonization method using natural sugarcane as raw material, and the characterization results demonstrate that the porous skeleton of sugarcane-derived carbon has outstanding porous support properties. By combining CuS with sugarcane-derived carbon, a porous material with outstanding photothermal conversion performance was synthesized. Four photo-thermal composite phase change materials（CPCMs） were prepared, the maximum loading mass of the support material C600 to the phase change materials（PCMs） reached 79.77 %. The C600-CuS-OC had excellent thermal storage properties with an enthalpy of melting of 276.3 J/g and a thermal conductivity of 0.61 W·m-1·K-1. The photo-thermal conversion efficiency of C600-CuS-OC was 83.2 %. Sugarcane carbon-based CPCMs are a low-cost and high-efficiency solar thermal storage material, which has great potential for applications in solar thermal storage, biomass utilization, and thermal management.

关键词： Solar energy Biomass carbon Photo-thermal conversion Thermal storage Thermal management Phase change materials

Global robust stabilization of feedforward systems with uncertainties

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2010年第3期8卷 262-270页

作者： Tianshi CHEN jie huang Department of Electrical Engineering Link6ping University Link6ping Sweden Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong China

This paper studies the global robust stabilization problem for a class of feedforward systems that is subject to both dynamic and time-varying static uncertainties. A small gain theorem-based bottom-up recursive design is developed for constructing a nested saturation control law. At each recursion, two versions of small gain theorem with restrictions are employed to establish the global attractiveness and local stability of the closed-loop system at the equilibrium point, respectively.

关键词： Robust control Nonlinear systems Asymptotic stabilization

Output-based adaptive distributed observer for general linear leader systems over periodic switching digraphs

在线全文

学校读者我要写书评

暂无评论

Autonomous Intelligent Systems 2023年第1期3卷 123-130页

作者： Changran He jie huang Shenzhen Research Institute and Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinN.T.Hong KongChina

In this paper,we present a sufficient condition for the exponential stability of a class of linear switched *** an application of this stability result,we establish an output-based adaptive distributed observer for a general linear leader system over a periodic jointly connected switching communication network,which extends the applicability of the output-based adaptive distributed observer from a marginally stable linear leader system to any linear leader system and from an undirected switching graph to a directed switching *** output-based adaptive distributed observer will be applied to solve the leader-following consensus problem for multiple double-integrator systems.

关键词： Distributed observer Multi-agent systems Stability Switched systems

Federated learning based QoS-aware caching decisions in fog-enabled internet of things networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Communications and Networks 2023年第2期9卷 580-589页

作者： Xiaoge huang Zhi Chen Qianbin Chen jie Zhang School of Communication and Information Engineering Chongqing University of Post and TelecommunicationsChongqing400065China School of Communication and Information Engineering University of SheffieldUnited Kingdom

Quality of Service(QoS)in the 6G application scenario is an important issue with the premise of the massive data *** caching based on the fog computing network is considered as a potential solution to effectively reduce the content fetch delay for latency-sensitive services of Internet of Things(IoT)*** the time-varying scenario,the machine learning techniques could further reduce the content fetch delay by optimizing the caching *** this paper,to minimize the content fetch delay and ensure the QoS of the network,a Device-to-Device(D2D)assisted fog computing network architecture is introduced,which supports federated learning and QoS-aware caching decisions based on time-varying user *** release the network congestion and the risk of the user privacy leakage,federated learning,is enabled in the D2D-assisted fog computing ***,it has been observed that federated learning yields suboptimal results according to the Non-Independent Identical Distribution(Non-IID)of local users *** address this issue,a distributed cluster-based user preference estimation algorithm is proposed to optimize the content caching placement,improve the cache hit rate,the content fetch delay and the convergence rate,which can effectively mitigate the impact of the Non-IID data set by *** simulation results show that the proposed algorithm provides a considerable performance improvement with better learning results compared with the existing algorithms.

关键词： Fog computing network IoT D2D communication Deep neural network Federated learning

Nanoforming of transferred metal contacts for enhanced twodimensional field effect transistors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 3210-3216页

作者： shuoheng Xu Zheng huang jie Guan Yaowu Hu The Institute of Technological Sciences Wuhan UniversityWuhan 430072China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China School of Physics Southeast UniversityNanjing 211189China

Two-dimensional transition metal chalcogenides(2D-TMDs)have attracted much attention because of their unique layered structure and physical properties for transistor *** transferred metal contacts on these low-dimensional materials or their homogeneous and heterogeneous multilayers have generated huge interest to avoid deposition *** this paper,we show that there are large physical gaps at both the edge contact and surface contact between the transferred electrodes and the 2D materials.A method called laser shock induced superplastic deformation(LSISD)is proposed to tackle this issue and enhance the performance of the *** enhancement mechanism was investigated by molecular dynamics(MD)simulations of the nanoforming process,atomic force microscopy(AFM),scanning electron microscopy(SEM),transmission electron microscopy(TEM)characterizations of the interfaces,and density functional theory(DFT)*** force effect of laser shock can reduce the contact gap between metals and *** electrical performances of the transistors before and after LSISD,along with MD simulations,are used to find the optimal process *** addition,this paper applies the LSISD method to the short-channel MoS_(2)/graphene vertical transistors to show potential improvement in interface contact and electrical *** paper demonstrates the first report on using mechanical force induced by laser shock to enhance metal–semiconductor interfaces and transistor performances.

关键词： laser shock nanoforming metal-semiconductor contact electronics two-dimensional transistors