检索结果-南通市图书馆

基于智能体的电力系统分布式自适应抗干扰控制

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

北京航空航天大学学报 2024年第5期50卷 1685-1692页

作者：石童昕陈龙胜李统帅金飞宇南昌航空大学飞行器工程学院南昌330063

针对多机电力系统中不可避免存在非线性、不确定特性和动态干扰等问题,基于径向基神经网络(RBFNN)和非线性干扰观测器(NDO)提出一种分布式自适应抗干扰控制器,以增强多机电力系统的暂态稳定性和鲁棒性。采用RBFNN处理系统中的未知非线... 详细信息

针对多机电力系统中不可避免存在非线性、不确定特性和动态干扰等问题,基于径向基神经网络(RBFNN)和非线性干扰观测器(NDO)提出一种分布式自适应抗干扰控制器,以增强多机电力系统的暂态稳定性和鲁棒性。采用RBFNN处理系统中的未知非线性问题,并基于神经网络的输出设计NDO以实现对复合扰动的在线估计;在多智能体框架下为多机电力系统提出一种分布式自适应抗干扰控制策略,实时接收通信网络测量的数据并控制储能装置动作,在外部扰动下实现各电机转速的快速同步与跟踪,并利用Lyapunov稳定性理论证明闭环系统信号的收敛性。仿真实验表明:所提策略有效可行。

关键词：暂态电力系统神经网络非线性干扰观测器多智能体暂态稳定性

维普期刊数据库

扑翼尾迹全自由柔性细丝的数值研究及参数预测

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2024年第1期40卷 123-137页

作者：孙唯真何国毅金飞宇王琦于沨 School of Aircraf Engineering Nanchang Hangkong UniversityNanchang 330063China

本文采用浸入边界法模拟了全自由度柔性细丝在涡街中被动变形产生的自适应运动,研究了不同柔性分布方式的细丝在不同涡街中的运动性能,并探讨了单根细丝个体与涡系之间的关系.此外,文章采用长短期记忆(LSTM)神经网络方法建立预测模型.... 详细信息

本文采用浸入边界法模拟了全自由度柔性细丝在涡街中被动变形产生的自适应运动,研究了不同柔性分布方式的细丝在不同涡街中的运动性能,并探讨了单根细丝个体与涡系之间的关系.此外,文章采用长短期记忆(LSTM)神经网络方法建立预测模型.该模型利用细丝上有限测点的训练数据来获得流场的物理参数特征,进而对细丝和扑翼的性能参数的数值变化进行预测,得到了细丝后25%运动周期内的性能参数。该方法可有效简化数值模拟过程.结果表明,预测模型对性能参数预测结果的平均绝对百分比误差稳定在0.09以下,该方法减少了总体实验和计算工作量的15%.进一步的研究表明,扑翼尾迹中的全自由度细丝共产生三类运动模式。仅当整根细丝被包裹在涡带中时,前缘和后缘产生的逆流向压力差可以推动细丝稳定逆来流运动,且细丝刚度的非均匀分布方式和细丝后缘更大的摆幅都有助于其推力的增加.

关键词：摆幅运动周期浸入边界法参数预测预测模型计算工作量物理参数涡街

Serum markers for detecting histological features of autoimmune hepatitis and predicting prognosis in patients with antinuclear antibody-positive drug-induced liver injury

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Portal Hypertension & Cirrhosis 2024年第2期3卷 96-104页

作者： feiyu Zhang Meishan jin Hongqin Xu Peng Xiao Yanhang Gao Division of Hepatology The First Hospital of Jilin UniversityJilin UniversityChangchunJilinChina Division of Pathology The First Hospital of Jilin UniversityJilin UniversityChangchunJilinChina

Aims:Although useful for distinguishing drug-induced liver injury(DILI)from autoimmune hepatitis(AIH),liver biopsy is an invasive examination,and the presence of antinuclear antibody(ANA)positivity in patients with DILI could lead to excessive use of ***,we aimed to identify screening markers for histological features of AIH in patients with ANA-positive DILI and verify their clinical outcomes after 1 ***:This retrospective study included patients with ANA-positive DILI,who underwent liver biopsy between January 2017 and April *** pathologists identified histological features of *** detected the independent indicators associated with histological features of AIH using logistic *** evaluated their diagnostic ability for histological features of AIH using the receiver operating characteristic *** followup period to determine clinical outcomes was 1 year after DILI ***χ2 test or Fisher's exact test was used to compare categorical data and the Wilcoxon rank-sum test was used to compare continuous *** p<0.05 was considered to indicate ***:The final analysis included 125 patients with ANA-positive DILI,of whom 18 had AIH-like *** independently associated with AIH-like histology included globulin levels(odds ratio[OR]=1.154,95%confidence interval[CI]=1.046-1.288;p=0.006)and ANA titer≥1:1000(OR=3.531,95%CI=1.136-11.303;p=0.029).The optimal globulin cutoff indicating AIH-like histology was 31.8 g/*** globulin level in combination with ANA titer≥1:1000(area under the curve=0.785,95%CI=0.738-0.832)provided a sensitivity of 100%and a specificity of 57%for indicating histological features of AIH in patients with ANA-positive *** follow-up,more patients developed AIH in the group with AIH-like histology than in the group without AIH-like histology(35.3%vs.0,p<0.001).Conclusions:For patients with ANA-positive DILI and ANA titer≥1:1000 or globulin≥31.8 g/L,liver biopsy is recomm

关键词： antibodies autoimmune hepatitis chemical-and drug-induced liver injury histology immunoglobulins

Modeling and Validation of Diamagnetic Rotor Levitated by Permanent Magnetics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2024年第3期37卷 224-235页

作者： Yuanping Xu Yue Zhang jin Zhou Chaowu jin College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

As an innovative,low-power consuming,and low-stiffness suspension approach,the diamagnetic levitation technique has attracted considerable interest because of its potential applicability in miniaturized mechanical *** foundation of a diamagnetic levitation system is mathematical modeling,which is essential for operating performance optimization and stability ***,few studies on systematic mathematical modeling have been *** this study,a systematic mathematical model for a disc-shaped diamagnetically levitated rotor on a permanent magnet array is *** on the proposed model,the magnetic field distribution characteristics,diamagnetic levitation force characteristics(i.e.,levitation height and stiffness),and optimized theoretical conditions for realizing stable levitation are *** are conducted to verify the feasibility of the proposed mathematical *** predictions and experimental results indicate that increasing the levitation height enlarges the stable ***,with a further increase in the rotor radius,the stable regions of the rotor gradually diminish and even ***,when the levitation height is fixed,a moderate rotor radius permits stable *** study proposes a mathematical modeling method for a diamagnetic levitation system that has potential applications in miniaturized mechanical systems.

关键词： Diamagnetic levitation Magnetic levitation Rotor Modeling Validation Stability

Shor's algorithm does not factor large integers in the presence of noise

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 China(Information Sciences) 2024年第7期67卷 305-320页

作者： jin-Yi CAI College of Letters and Science University of Wisconsin

We consider Shor's quantum factoring algorithm in the setting of noisy quantum gates. Under a generic model of random noise for(controlled) rotation gates, we prove that the algorithm does not factor integers of the form pq when the noise exceeds a vanishingly small level in terms of n—the number of bits of the integer to be factored, where p and q are from a well-defined set of primes of positive density. We further prove that with probability 1-o(1) over random prime pairs(p, q), Shor's factoring algorithm does not factor numbers of the form pq, with the same level of random noise present.

关键词： random noise Shor's algorithm rotation gates quantum computing prime factorization

同方期刊数据库

Theoretical and experimental investigations on single-atom catalysis:Pt1/FeOx for water-gas shift reaction Shan-Fei Wang1,§,Yangyang Li2,3,§,Haiyan Wang1,jin-Xia Liang1(✉),Chun Zhu1

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8627-8637页

作者： Shan-Fei Wang Yangyang Li Haiyan Wang jin-Xia Liang Chun Zhu Botao Qiao School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Oxide-supported metal single-atom catalysts(SACs)have exhibited excellent catalytic performance for water-gas shift(WGS)***,we report the single-atom catalyst Pt1/FeOx exhibits excellent medium temperature catalytic performance for WGS reactions by the density functional theory(DFT)calculations and experimental *** calculations indicate that H_(2)O molecules are easily dissociated at oxygen vacancies,and the formed*OH and*O are adsorbed on Pt1 single atoms and the adjacent O atoms,*** studying four possible reaction mechanisms,it is found that the optimal WGS reaction pathway is proceeded along the carboxyl mechanism(pathway III),in which the formation of*COOH intermediates can promote the stability of Pt1/FeOx SAC and the easier occurrence of WGS *** energy barrier of the rate-determining step during the entire reaction cycle is only 1.16 eV,showing the high activity for the medium temperature WGS reaction on Pt1/FeOx SAC,which was verified by experimental ***,the calculated turnover frequencies(TOFs)of CO_(2)and H_(2)formation on Pt1/FeOx at 610 K(337℃)can reach up to 1.14×10^(-3)s^(-1)·site^(-1)through carboxyl *** this work,we further expand the application potential of Pt1/FeOx SAC in WGS reaction.

关键词： water-gas shift(WGS)reaction single-atom catalyst(SAC) density functional theory(DFT) thermocatalysis

Mobility of rhenium and selenium during chemical weathering and their implication for petrogenic organic carbon oxidation

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 China Earth Sciences 2024年第3期67卷 740-750页

作者： Yuhong ZHANG jin WANG Yuanxin QU Chao ZHU Zhangdong jin State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China University of Chinese Academy of Sciences Beijing 100049China Xi'an Institute for Innovative Earth Environment Research Xi'an 710061China Institute of Global Environmental Change Xi'an Jiaotong UniversityXi'an 710049China

The oxidative weathering of petrogenic organic carbon(OC_(petro)) is an important source of carbon dioxide(CO_(2)) into the atmosphere on geological timescales and significantly influences the carbon cycle and global climate change. However, at present, a robust proxy to assess OC_(petro)oxidation is lacking. Riverine rhenium(Re) has emerged as a potential proxy to trace OC_(petro)oxidation, but little is known about Re sources and its relationship with OC_(petro)oxidation. To better understand the robustness of this proxy, we analyzed a shale weathering profile from the early Cambrian Shuijingtuo Formation in Chengkou County, Chongqing City, to address the mobility of Re and selenium(Se) and their relationship with the oxidation of OC_(petro)by analyses of the elemental variation and sequential extraction. The results showed that the chemical index of alteration(CIA)increases from the fresh bedrock to the weathered sections, indicating enhanced weathering intensity. Based on the sequential extraction and mass transfer coefficients(τ), Re and Se mainly exist in the organic phase of shale and are paired lost with OC_(petro) during weathering, with no obvious correlation with sulfide minerals. Furthermore, the different proportions of Re and Se loss with OC_(petro) loss can be attributed to their different geochemical behaviors during weathering. Our study supports Re as a robust proxy to trace OC_(petro) oxidation, whereas Se is the potential one. In the future, combined studies on various sedimentary rock profiles with catchment basins are needed to determine the sources of riverine Re and Se and their relationships with OC_(petro) oxidation.

关键词： Rhenium and selenium Shale Mobility OC_(petro) Chemical weathering

维普期刊数据库

同方期刊数据库

Semi-analytical Solutions for Wellbores with Graded Skin Zones in Poroelastic Media

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2024年第3期37卷 385-395页

作者： Zhiqiang Fan Zhihe jin School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China Department of Mechanical Engineering University of MaineOronoME04469USA

In analyzing the complex interaction between the wellbore and the reservoir formation,the hydromechanical properties of the region proximal to the wellbore,referred to as the“wellbore skin zone”,play a pivotal role in determining flow dynamics and the resulting formation *** models of the wellbore skin zone generally assume a constant permeability throughout,resulting in a sharp permeability discontinuity at the skin-reservoir *** paper introduces a model for a wellbore with a continuously graded skin zone of finite thickness within a poroelastic *** solutions are derived using the Laplace transform method,addressing both positive and negative skin *** results are presented to illustrate the effects of graded permeability/skin zone thickness on pore pressures and stresses around a *** results highlight a distinct divergence in stress and pore pressure fields when comparing wellbores with negative skin zones to those with positive skin zones or no skin at all.

关键词： Poroelastic Graded permeability Analytical solution Wellbore Skin zone

Combined Treatment with Bojungikgi-tang(Buzhong Yiqi Decoction)and Riluzole Attenuates Cell Death in TDP-43-Expressing Cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2024年第7期30卷 616-622页

作者： Eun jin Yang Department of KM Science Research Korea Institute of Oriental MedicineDaejeonYuseong-gu34054Republic of Korea

Objective To examine the effect of combined treatment with Bojungikgi-tang(BJIGT,Buzhong Yiqi Decoction)and riluzole(RZ)in transactive response DNA-binding protein 43(TDP-43)stress granule(SG)cells,a amyotrophic lateral sclerosis(ALS)cell line using transcriptomic and molecular *** TDP-43 SG cells were pretreated with BJIGT(100µg/mL),RZ(50µmol/L),and combined BJIGT(100µg/mL)/RZ(50µmol/L)for 6 h before treatment with lipopolysaccharide(LPS,200µmol/L).Cell viability assay was performed to elucidate cell toxicity in TDP-43 SC cells using a cell-counting kit-8(CCK8)assay *** expression levels of cell death-related proteins,including Bax,caspase 1,cleaved caspase 3 and DJ1 in TDP-43 SG cells were examined by Western blot *** autophagy-related proteins,including pmTOR/mTOR,LC3b,P62,ATG7 and Bcl-2-associated athanogene 3(Bag3)were investigated using immunofluorescence and immunoblotting *** Cell viability assay and Western blot analysis showed that combined treatment with BJIGT and RZ suppressed LPS-induced cell death and expression of cell death-related proteins,including Bax,caspase 1,and DJ1(P<0.05 or P<0.01).Immunofluorescence and immunoblotting assays showed that combined treatment with BJIGT and RZ reduced LPS-induced formation of TDP-43 aggregates and regulated autophagy-related protein levels,including p62,light chain 3b,Bag3,and ATG7,in TDP-43-expressing cells(P<0.05 or P<0.01).Conclusion The combined treatment of BJIGT and RZ might reduce inflammation and regulate autophagy dysfunction in TDP-43-induced ALS.

关键词： Bojungikgi-tang Buzhong Yiqi Decoction transactive response DNA-binding protein 43 autophagy oxidative stress amyotrophic lateral sclerosis

维普期刊数据库