检索结果-南通市图书馆

Journal of Energy Chemistry 2018年第4期27卷 1219-1224页

作者： Guoxiang Wang mingyuan zhang Hongfeng Xu Lu Lu Zuoyi Xiao Sa Liu School of Light Industry & Chemical Engineering Dalian Polytechnic University School of Electronics and Information Engineering Dalian Jiaotong University School of Chemistry and Materials Science Jiangsu Normal University

The increasing demand of high-performance supercapacitors has aroused great interest in developing specific capacitance and energy density. Active carbon （AC） has attracted much attention as a promising electrode material for electric double-layer capacitors （EDLCs）. Here, a facile strategy has been employed to fabricate high-performance EDLCs using the surface-oxygen functionalized active carbon （FAC） as an electrode and 2 M KOH with K3Fe（CN）6 as an electrolyte. In this system, K3Fe（CN）6 was used as a redox additive to enhance the performance of EDLCs. A 38.5% increase in specific capacitance （207.7 F g-1） was achieved compared with the KOH electrolyte without adding K3Fe（CN）G （152.9 F g-1）, due to the synergistic effects between oxygenic functional groups and redox electrolyte. These findings provide an alternative route to improve the performance of EDLCs, which are promising candidates for the broad applications of high-performance supercapacitors.

关键词： Functional carbon material Redox-active electrolytes Electrical double layer Supercapacitnr

Phase distribution in horizontal gas-liquid two-phase bubbly flow

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 1999年第3期10卷 184-189页

作者： SUN Kexia zhang mingyuan CHEN Xuejun (Xi’an Jiaotong University, Xi’an, 710049) Xi'an Jiaotong University Xi'an 710049

An investigation on phase distribution in air-water two-phase flow in horizontal circular channel was conducted by using the double-sensor resistivity *** variations of phase distribution with variations of gas and liquid volumetric fluxes were analyzed and the present data were compared with some of other researcher’s data and existing models. It was found there exists more complicated phase distribution pattern in horizontal flow system than in vertical flow. The radial local void fraction profiles are similar at the same measurement angle with various gas and liquid flow rates. However, an asymmetric profile can be observed at a given slice of the pipe cross-section.

关键词：气-液二相液起泡流相分布

Adaptive estimation and control for uncertain nonlinear systems and full actuation control

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2023年

作者： Fei YAN mingyuan zhang Guoxiang GU School of Information Science and Technology Southwest Jiaotong University School of Electrical Engineering and Computer Science Louisiana State University

We study adaptive control for a family of nonlinear systems, involving unknown and uncertain parameters. The proposed control law estimates the system parameters adaptively and stabilizes the closedloop system asymptotically for the initial state over any given bounded set of the state-space. Moreover,reconstruction filters are designed to obtain error residue signals and to enable the use of the least-squares algorithm for estimating the parameters, in order to achieve the convergence based on the persistent excitation condition and asymptotic linearization. The proposed methods are applicable to full actuation and under actuation control systems. Simulation studies are carried out for a pendulum system and for a third-order vehicle model, as well as control of vehicle platoons, validating the theoretical results presented in this paper.

关键词：

High-Quality Critical Heat Flux in Horizontally Coiled Tubes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 1995年第3期4卷 205-211页

作者： Weimin Ma mingyuan zhang Xuejun Chen (State Key Laboratory of Multiphase Flow in PoWer Engineering, Xi’an Jiaotong Universityt Xi’an 710049, China) State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China

An investigation on the high-quality dryout in two electrically heated coiled tubes with horizontally helix axes is reported. The temperature profiles both along the tube and around the circumference are measured, and it is found that the temperature profiles around the circumference are not idelltical for the cross-sections at different parts of the coil. The 'local condition hypothesis' seems applicable under present conditions, and the critical heat flux qcr decreases with increasing critical quality xcr The CHF increases as mass velocity and ratio of tube diameter to coil diameter (d/D) increases, and it seems not to be effected by the system pressure. The CHF is larger with coils than that with straight tubes, and the difference increases with increasing mass velocity and d/D.

关键词： horizoatally coiled tube critical heat flux.

Construction of Cu-Ce interface for boosting toluene oxidation:Study of Cu-Ce interaction and intermediates identified by in situ DRIFTS

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第11期32卷 3435-3439页

作者： Jiahui Lu Jinping Zhong Quanming Ren Jiaqi Li Linghe Song Shengpeng Mo mingyuan zhang Peirong Chen Mingli Fu Daiqi Ye School of Environment and Energy South China University of TechnologyGuangzhou 510006China

A facile hydrothermal method was applied to gain stably and highly efficient CuO-CeO_(2)(denoted as Cu1Ce2)catalyst for toluene *** changes of surface and inter properties on Cu1Ce2 were investigated comparing with pure CeO_(2)and pure *** formation of Cu-Ce interface promotes the electron transfer between Cu and Ce through Cu^(2+)+Ce^(3+)↔Cu^(+)+Ce^(4+)and leads to high redox properties and mobility of oxygen ***,the Cu1Ce2 catalyst makes up the shortcoming of CeO_(2)and CuO and achieved high catalytic performance with T_(50)=234°C and T_(99)=250°C(the temperature at which 50%and 90%C_(7)H_(8)conversion is obtained,respectively)for toluene *** reaction steps and intermediates for toluene oxidation over Cu1Ce2,CeO_(2)and CuO were detected by in situ DRIFTS,the fast benzyl species conversion and preferential transformation of benzoates into carbonates through C=C breaking over Cu1Ce2 should accelerate the reaction.

关键词： Cu-Ce interface Oxygen mobility Intermediates In situ DRIFTS Toluene oxidation

Export Credit Insurance Facilitates Cross-Border RMB Settlement

在线全文

学校读者我要写书评

暂无评论

China News Release 2023年第8期 17-19页

作者： Fang Lei zhang mingyuan 不详

As China’s Cross-Border RMB Settlement As the world’s second largest consumer market and the biggest trader of goods,China has expanded the cross-border RMB settlement in an orderly manner,and deepened the market-oriented reform of the RMB exchange rate,with the result that the curren cy exchange rate is generally maintained at a reasonable and balanced level.

关键词： Export RMB maintained

Characterizing Flight Delay Profiles with a Tensor Factorization Framework

在线全文

学校读者我要写书评

暂无评论

Engineering 2021年第4期7卷 465-472页

作者： mingyuan zhang Shenwen Chen Lijun Sun Wenbo Du Xianbin Cao School of Electronic and Information Engineering Beihang UniversityBeijing 100191China National Engineering Laboratory for Comprehensive Transportation Big Data Application Technology Beijing 100191China Department of Civil Engineering and Applied Mechanics McGill UniversityMontrealQC H3A 0C3Canada

In air traffic and airport management,experience gained from past operations is crucial in designing appropriate strategies when facing a new ***,this paper uses massive spatiotemporal flight data to identify similar traffic and delay patterns,which become critical for gaining a better understanding of the aviation system and relevant ***,as the datasets imply complex dependence and higher-order interactions between space and time,retrieving significant features and patterns can be very *** this paper,we propose a probabilistic framework for highdimensional historical flight *** apply a latent class model and demonstrate the effectiveness of this framework using air traffic data from 224 airports in China during 2014–*** find that profiles of each dimension can be clearly divided into various patterns representing different regular *** prove the effectiveness of these patterns,we then create an estimation model that provides preliminary judgment on the airport delay *** outcomes of this study can help airport operators and air traffic managers better understand air traffic and delay patterns according to the experience gained from historical scenarios.

关键词： Air traffic management Flight delay Latent class model Tensor decomposition

全球对流层延迟快速射线追踪方法及高精度应用

在线全文

学校读者我要写书评

暂无评论

武汉大学学报（信息科学版） 2024年第11期49卷 2156-2157页

作者：张明远武汉大学卫星导航定位技术研究中心湖北武汉430079

对流层延迟是全球导航卫星系统(global navigation satellite system,GNSS)、甚长基线干涉测量(very long baseline interferometry,VLBI)等基于电磁波信号的空间大地测量技术的主要误差源之一。同时,对流层延迟还能够用于大气水汽反演... 详细信息

对流层延迟是全球导航卫星系统(global navigation satellite system,GNSS)、甚长基线干涉测量(very long baseline interferometry,VLBI)等基于电磁波信号的空间大地测量技术的主要误差源之一。同时,对流层延迟还能够用于大气水汽反演,已成为大气科学研究的一种重要观测数据。精确估计对流层延迟对于提升空间大地测量的数据解算精度并促进其在大气科学中的应用都至关重要。射线追踪方法基于气象数据构建的三维折射率场,通过几何光学原理确定信号在地球中性大气中的传播路径,是目前精度最高的对流层延迟估计方法。

关键词：对流层延迟甚长基线干涉测量大气科学研究空间大地测量水汽反演全球导航卫星系统电磁波信号 VLBI

BIOGEOCHEMICAL PROVINCE AND ENDEMIA

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 1986年第4期30卷 389-396页

作者：王明远章申 Institute of Geography Academia Sinica Beijing

This paper compendiously deals with the correlativity of organism with geochemical environment, the relationship between hyperqene geochemical anomaly and epidemic of biogeochemical endemia and the types of formative ... 详细信息

关键词： BIOGEOCHEMICAL PROVINCE AND ENDEMIA

考虑膜片弹簧非线性的干式离合器位置闭环控制

在线全文

学校读者我要写书评

暂无评论

汽车工程 2020年第7期42卷 894-900,908页

作者：张明远陈俐上海交通大学动力装置与自动化研究所海洋工程国家重点实验室上海200240

鉴于离合器膜片弹簧具有非线性刚度,且在部分行程中为负值,引起系统失稳,降低离合器位置控制精度,提出微分平坦前馈与增益自调整的反馈相结合的非线性控制方法。仿真和实验结果证实了膜片弹簧负刚度引起的失稳现象,与传统的未考虑膜片... 详细信息

鉴于离合器膜片弹簧具有非线性刚度,且在部分行程中为负值,引起系统失稳,降低离合器位置控制精度,提出微分平坦前馈与增益自调整的反馈相结合的非线性控制方法。仿真和实验结果证实了膜片弹簧负刚度引起的失稳现象,与传统的未考虑膜片弹簧负刚度特性的控制方法相比,本文提出的非线性控制方法可克服失稳现象,且跟踪误差小。

关键词：膜片弹簧负刚度微分平坦增益自调整