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The influence of correlation delay and spectral asymmetry on acoustic Doppler velocimetry bias

Chinese Journal of Acoustics 2020年第3期39卷 351-371页

作者： LI Meiqi wang changhong DENG Kai Ocean Acoustic Technology Center Institute of AcousticsChinese Academy of SciencesBeijing 100190 Department of Electronic and communication engineering University of Chinese Academy of SciencesBeijing 100049 Beijing Engineering Technology Research Center of Ocean Acoustic Equipment Beijing 100190

The influence of correlation delay and spectral amplitude asymmetry of the received signal on acoustic Doppler velocimetry bias with the complex covariance approach are *** the simplifying error of the velocimetry formula,the velocimetry bias is simplified to the Doppler shift measurement *** is deduced that if not considering the beam angle,the narrowband frequency measurement is unbiased while the broadband frequency measurement is biased;and if considering the beam angle,the narrowband and broadband frequency measurement are all *** correlation delay and asymmetric spectrum are important sources of the *** analysis shows that the frequency measurement bias can be reduced to 0 by eliminating the correlation delay inaccuracy or spectral *** on the above findings,the ellipse grid frequency measurement model with dual weighting of signal phase and amplitude for the bottom tracking Doppler velocimetry sonar is proposed;the theoretical analysis for the difference between the broadband and narrowband frequency measurement bias with the same pulse length is *** proposed broadband frequency measurement model is utilized to simulate the fitting curve of the Doppler shift and the frequency estimation bias,with which the actual data is *** the water tank experiment,the relative velocimetry bias decreases from 1.14%to 0.78%,and the maximum absolute value decreases from 2.83%to 1.83%;and for sea trial,the relative velocimetry bias decreases from 4.79%to 3.82%.

关键词： delay spectral eliminating

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Antidepressants for bipolar disorder A meta-analysis of randomized, double-blind, controlled trials

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Neural Regeneration Research 2013年第31期8卷 2962-2974页

作者： Yingli Zhang Huan Yang Shichang Yang Wei Liang Ping Dai changhong wang Yalin Zhang Mental Health Institute Second Xiangya Hospital Central South University Psychological Counseling Center Second Affiliated Hospital of Xinxiang Medical University Department of Psychology Xinxiang Medical University Department of Clinical Psychology Second Affiliated Hospital of Xinxiang Medical University Sichuan University Library

OBJECTIVE： To examine the efficacy and safety of short-term and long-term use of antidepres- sants in the treatment of bipolar disorder. DATA SOURCES： A literature search of randomized, double-blind, controlled trials published until December 2012 was performed using the PubMed, ISI Web of Science, Medline and Cochrane Central Register of Controlled Trials databases. The keywords ＂bipolar disorder, bipolar I disorder, bipolar II disorder, bipolar mania, bipolar depression, cyclothymia, mixed mania and depression, rapid cycling and bipolar disorder＂, AND ＂antidepressant agent, antidepressive agents second- generation, antidepressive agents tricyclic, monoamine oxidase inhibitor, noradrenaline uptake in- hibitor, serotonin uptake inhibitor, and tricyclic antidepressant agent＂ were used. The studies that were listed in the reference list of the published papers but were not retrieved in the above-mentioned databases were supplemented. STUDY SELECTION： Studies selected were double-blind randomized controlled trials assessing the efficacy and safety of antidepressants in patients with bipolar disorder. All participants were aged 18 years or older, and were diagnosed as having primary bipolar disorder. Antidepressants or antidepressants combined with mood stabilizers were used in experimental interventions. Placebos, mood stabilizers, antipsychotics and other antide pressants were used in the control interventions. Studies that were quasi-randomized studies, or used antidepressants in combination with antipsy- chotics in the experimental group were excluded. All analyses were conducted using Review Man- ager 5.1 provided by the Cochrane Collaboration.

关键词： neural regeneration evidence-based medicine bipolar disorder bipolar depression antidepressant response switching to mania suicidality meta-analysis grants-supported paper neuroregeneration

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High-Performance Quasi-Solid-State Pouch Cells Enabled by in situ Solidification of a Novel Polymer Electrolyte

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Energy & Environmental Materials 2023年第4期6卷 15-21页

作者： Qingwen Lu changhong wang Danni Bao Hui Duan Feipeng Zhao Kieran Doyle-Davis Qiang Zhang Rennian wang Shangqian Zhao Jiantao wang Huan Huang Xueliang Sun Glabat Solid-State Battery Inc. 700 Collip CircleLondon ON N6G 4X8Canada Department of Mechanical and Materials Engineering University of Western OntarioLondon ON N6A 5B9Canada China Automotive Battery Research Institute Co LtdBeijing 101407China

Conventional lithium-ion batteries(LIBs)with liquid electrolytes are challenged by their big safety concerns,particularly used in electric ***-solid-state batteries using solid-state electrolytes have been proposed to significantly improve safety yet are impeded by poor interfacial solid–solid contact and fast interface *** a compromising strategy,in situ solidification has been proposed in recent years to fabricate quasi-solid-state batteries,which have great advantages in constructing intimate interfaces and cost-effective mass *** this work,quasi-solid-state pouch cells with high loading electrodes(≥3 m Ah cm^(-2))were fabricated via in situ solidification of poly(ethylene glycol)diacrylate-based polymer electrolytes(PEGDA-PEs).Both single-layer and multilayer quasi-solid-state pouch cells(2.0 Ah)have demonstrated stable electrochemical performance over500 *** superb electrochemical stability is closely related to the formation of robust and compatible interphase,which successfully inhibits interfacial side reactions and prevents interfacial structural *** work demonstrates that in situ solidification is a facile and cost-effective approach to fabricate quasi-solid-state pouch cells with both excellent electrochemical performance and safety.

关键词： high areal capacity high-energy-density pouch cells in situ solidification poly(ethylene glycol)diacrylate-based polymer electrolyte

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大直径盾构隧道中隔墙施工流程及精度控制

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铁道建筑 2024年第9期64卷 101-107页

作者：李培楠张子尧郇昊霖焦磊宋兴宝邱龑王长虹东华大学环境科学与工程学院上海201620 上海工程技术大学城市轨道交通学院上海201620 上海隧道工程有限公司上海200032 上海大学力学与科学工程学院土木工程系上海200444

以上海机场联络线3标为工程背景,对大直径盾构隧道中隔墙的作业过程及误差控制进行研究。首先,根据设计方案和施工情况,对中隔墙的整体施工流程进行梳理。其次,确定了中隔墙的安装方法,同时针对中隔墙安装精度提出相应的控制措施,既提... 详细信息

以上海机场联络线3标为工程背景,对大直径盾构隧道中隔墙的作业过程及误差控制进行研究。首先,根据设计方案和施工情况,对中隔墙的整体施工流程进行梳理。其次,确定了中隔墙的安装方法,同时针对中隔墙安装精度提出相应的控制措施,既提高了中隔墙的施工效率,又具有安全稳定、成本低且易推广等特点。最后,选取部分中线拼装偏差测量数据,对中隔墙安装时的精度控制效果进行A类不确定度分析。结果表明:中隔墙的旋转中心距离中隔墙底部为4034 mm,中隔墙的抬升高度为1838 mm。对第995、1000、1005环的中线偏差数据采用A类不确定度予以评判,测量结果分别为1.05、2.05、3.06 mm,检测的次数各为20次,自由度为19,置信概率95%,测量精度很高。

关键词：市域铁路大直径盾构隧道预制中隔墙施工流程精度控制统计分析

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Microstructure Evolution and Dynamic Mechanical Properties of Laser Additive Manufacturing Ti-6Al-4V Under High Strain Rate

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Journal of Beijing Institute of Technology 2020年第4期29卷 568-580页

作者： Tao wang Lei Zhu changhong wang Mingming Liu Ning wang Lingchao Qin Hao wang Jianbo Lei Jie Tang Jun Wu College of Aeronautical Engineering Civil Aviation University of ChinaTianjin 300300China Qingdao International Airport Group Co.Ltd. Qingdao 266000China Zhejiang Loong Airlines Co.Ltd. Hangzhou 311207China Center of Engineering and Technology Civil Aviation University of ChinaTianjin 300300China Research Center of Laser Technology Tianjin Polytechnic UniversityTianjin 300387China

The dynamic mechanical properties of the Ti-6Al-4V(TC4)alloy prepared by laser additive manufacturing(LAM-TC4)under the high strain rate(HSR)are *** dynamic compression experiments of LAM-TC4 are conducted with the split Hopkinson pressure bar(SHPB)*** results show that as the strain rate increases,the widths of the adiabatic shear band(ASB),the micro-hardness,the degree of grain refinement near the ASB,and the dislocation density of grains grow ***,the increase of dislocation density of grains is the root factor in enhancing the yield strength of ***,the heat produced from the distortion and dislocations of grains promotes the heat softening effect favorable for the recrystallization of grains,resulting in the grain refinement of ***,the contrastive analysis between LAM-TC4 and TC4 prepared by forging(F-TC4)indicates that under the HSR,the yield strength of LAM-TC4 is higher than that of F-TC4.

关键词： laser additive manufacturing Ti-6Al-4V dynamic mechanics properties microstructure

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Deterministic and Robust Volt-var Control Methods of Power System Based on Convex Deep Learning

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 719-729页

作者： Qing Ma changhong Deng the School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

Volt-var control(VVC)is essentially a non-convex optimization problem due to the non-convexity of power flow(PF)constraints,resulting in the difficulty in obtaining the optimum without convexity *** existing second-order cone method for the convexity conversion often leads to a sharp increase in PF constraints and optimization variables,which in turn increases the optimization difficulty or even leads to optimization *** paper first proposes a deterministic VVC method based on convex deep learning power flow(DLPF).This method uses the input convex neural network(ICNN)to establish a single convex mapping between state parameters and node voltage to complete the convexity conversion while the optimization variables only correspond to reactive power equipment,which can ensure the global optimum with extremely fast computation *** cope with the impact brought by the uncertainty of distributed energy and omit the additional worst scenario search of traditional robust VVC,this paper proposes robust VVC method based on convex deep learning interval power flow(DLIPF),which continues to adopt ICNN to establish another convex mapping between state parameters and node voltage *** DLIPF with DLPF,this method decreases the modeling and optimization difficulty of robust VVC *** results on 30-bus,118-bus,and 200-bus systems prove the correctness and rapidity of the proposed methods.

关键词： Volt-var control convexity conversion convex deep learning power flow

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The influence of vessel attitude on spatial-temporal correlation of sea-bottom reverberation

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Chinese Journal of Acoustics 2018年第2期37卷 146-157页

作者： YAN Shanyong QIU Wei ZHAO Erliang wang changhong Ocean Acoustic Technology Center Institute of Acoustics CAS 100190 Beijing University of Chinese Academy of Sciences 100049 Beijing Beijing Engineering Technology Research Center of Ocean Acoustic Equipment 100190 Beijing

The influence of vessel attitude on spatial-temporal correlation of sea-bottom re- verberation is discussed. The theoretical correlation function is deduced in consideration of the attitude of vessel. The relationship of the spatial-temporal correlation and the vessel attitude is obtained： The greater the sway of the vessel on some direction is, the faster the correlation coefficient decreases on the direction. The theoretical correlation function agrees well with the simulation result when sea-bottom has no large-scale relief but has isotropic roughness. The actual sea-bottom usually has large-scale relief and anisotropic roughness, so the vessel attitude and the large-scale relief cannot determine the shape of the correlation function, but trial data has proved their combined influence. In addition, the influence of the vessel attitude on the measurement of vertical velocity is discussed.

关键词： The influence of vessel attitude on spatial-temporal correlation of sea-bottom reverberation

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Modeling of Hemispherical Resonator Gyro Resonator Deformation under Acceleration 26th

Modeling of Hemispherical Resonator Gyro Resonator Deformati...

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第26届中国控制与决策会议

作者： YI Guoxing XIE Yangguang wang changhong QI Ziyang FANG Zhen Space Control and Inertial Technology Research Center Harbin Institute of Technology Flight Automatic Control Research Institute Aviation Industry Corporation of China No.26 Research Institute China Electric Technology Group Corporation

ISBN: (纸本)9781479937097

This paper solves the deformation modeling problem of hemispherical resonance gyroscope（HRG）under the acceleration in low ***,the deformation problem is ascribed to the deformation of resonator shell structure,which can be modeled by dynamical equations in theory of thin *** solving the dynamic equations,obtain the analytic solution of resonator deformation under ***,the paper makes a contrast of FEA simulation result and the proposed *** result shows that the fitting error is smaller than 2.7%,which is verified its usability.

关键词： Hemispherical resonance gyroscope Resonator Theory of thin shell Acceleration Finite element analysis Gyro drift

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Atomically Dispersed Ru-Decorated TiO_(2) Nanosheets for Thermally Assisted Solar-Driven Nitrogen Oxidation into Nitric Oxide

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CCS Chemistry 2022年第4期4卷 1208-1216页

作者： Yanmei Huang changhong wang Yifu Yu Yu Yu Weichao wang Bin Zhang Department of Chemistry Institute of Molecular PlusSchool of ScienceTianjin UniversityTianjin 300072 College of Electronic Information and Optical Engineering Nankai UniversityTianjin 300350

Thermally assisted photodriven nitrogen oxidation to nitric oxide(NO)using air as a reactant is a promising way to supersede the traditional NO synthesis industry accompanied by huge energy expenditure and greenhouse gas ***,breaking the N≡N triple bond(941 kJ·mol^(−1))in nitrogen is still challenging,and the development of more efficient catalysts is ***,Ru single atoms decorated TiO_(2) nanosheets(Ru SAs/TiO_(2))were constructed and achieved superior performance for NO photosynthesis with a product rate of 192μmol g^(−1) h^(−1) and a quantum efficiency of 0.77% at 365 *** ^(15)N isotope labeling experiments and in situ near ambient pressure X-ray photoelectron spectroscopy(in situ NAP-XPS)proved the origin of NO from N_(2) photooxidation.A series of in situ characterizations and theoretical calculations unveiled the reaction pathway of nitrogen *** the O-O bond to form(N-O)2-Ru intermediates was demonstrated as the rate-determining ***,a single-atomic structure was proven to inhibit the aggregation and inactivation of Ru,leading to outstanding durability.

关键词： nitrogen oxidation Ru single atom photosynthesis reaction pathway durability

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The effect of a layer of varying density on spatial correlation of sea-bottom backscattering signal

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Chinese Journal of Acoustics 2015年第2期34卷 107-122页

作者： LI Dandan wang changhong ZHAO Erliang QIU Wei Institute of Acoustics Chinese Academy of Sciences Beijing 100190 University of Chinese Academy of Sciences Beijing 100049

The research is about the effect of a layer of varying density of sea-bottom sediments on spatial correlation of sea-bottom backscattering. The relationship between scattering cross section and spatial correlation is that backscattering cross section decreases quickly and the spatial correlation becomes stronger as the incident angle increases. Therefore, the density- depth profile is introduced into sea-bottom high-frequency backscattering echo model, which is used to simulate sea-bottom backscattering and calculate the function of spatial correlation. The influence of the density gradient on spatial correlation of sea-bottom backscattering is investigated by analyzing the relations between vertical gradient of density and the scattering cross section. As can be seen from the simulation results, the impact of the density gradient on the spatial correlation is found more significant. While the density gradient increases, the scattering cross-section and the radius of the spatial correlation broaden, the spatial correlation becomes stronger. At the same time, the scattering cross-section decreases more quickly as the incident angle increases.

关键词： The effect of a layer of varying density on spatial correlation of sea-bottom backscattering signal

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