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三维MR弹性成像显示慢性乙型或丙型肝炎病人的肝脏炎症、纤维化和门静脉高压

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国际医学放射学杂志 2021年第6期 736-737页

作者： Y.Shi Y.F.Qi G.Y.Lan Q.J.Wu b.ma X.Y.Zhang 杨瑞雪

在慢性乙型肝炎(CHb)或慢性丙型肝炎(CHC)中,测量肝脏的机械特性以分类肝脏的各种病理生理状态的价值尚未确定。目的评估多参数三维(3D)MR弹性成像作为

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倾斜衬底沉积法在金属衬底上外延生长YbCO薄膜

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倾斜衬底沉积法在金属衬底上外延生长YBCO薄膜

Elemental Sulfur in Diesels Known by GC/AED

第五届中国功能材料及其应用学术会议

作者：李美亚赵兴中 b.ma R.E.Koritala U.balachandran 武汉大学物理科学与技术学院 Energy Technology Division Argonne National Laboratory Argonne IL 60439 USA

Yba2Cu3O7-x(YbCO)镀膜导体在电力等能源领域有巨大应用前景。利用倾斜村底沉积法在无织构的金属村底上生长了MgO双轴织构的模板层,在这一模板层上实现了双轴织构的YbCO薄膜的外延生长。这些膜的双轴织构用X射线极图分析、φ-扫描作了测... 详细信息

Yba2Cu3O7-x(YbCO)镀膜导体在电力等能源领域有巨大应用前景。利用倾斜村底沉积法在无织构的金属村底上生长了MgO双轴织构的模板层,在这一模板层上实现了双轴织构的YbCO薄膜的外延生长。这些膜的双轴织构用X射线极图分析、φ-扫描作了测定,观测到了MgO[001]方向相对于衬底法线倾斜了31°。研究了不同缓冲层材料对YbCO外延生长的取向和双轴织构的影响,外延生长的高质量的YbCO薄膜的转变温度和临界电流密度分别达到了91K和5.5×105A/cm2的较高的值。

关键词： YbCO镀膜导体倾斜衬底沉积法外延生长

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Elemental Sulfur in Diesels Known by GC/AED

没食子酸与胶原蛋白多肽之间相互作用酏分子力学和动力学研究

第三十五届国际光谱会议

作者： S.J.Wang ~1 F.X.Ling ~1 b.ma~2 ~1Fushun Research Institute of Petroleum & Petrochemicals,Fushun 113001,China ~2Liaoning University of Petroleum & Chemical Technology,Fushun 113001,China

＜正＞The production of clean diesels by deep hydrodesulfurization（HDS）has attracted an increasing attention recently due to the introduction of new environmental regulations regarding fuel specifications.A well-understanding sulfur compounds in diesels is useful to clarify the reaction mechanism and to optimize the process of *** use of sulfur selective detectors in GC has grown in recent years with the increasing industrial

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北京皮革（中外鞋讯）（下） 2013年第4期 84-87页

作者： b.ma,dhan P.Thanikaivelan V.Subramanian J.EaghavaEao baIachandranUnniNair T.Ramasamj 何青(编译) 不详四川大学制革清洁技术国家工程实验室成都610065

应用分子建模的方法可以模拟植物鞣剂对蛋白质的鞣制作用，识别相互作用位点，计算配位化合物的结合能，有助于理解胶原多肽与没食子酸之间的相互作用。计算不同几何结构的结合能范围为6—13kal／mol。研究发现，一些配合物之间显示出... 详细信息

应用分子建模的方法可以模拟植物鞣剂对蛋白质的鞣制作用，识别相互作用位点，计算配位化合物的结合能，有助于理解胶原多肽与没食子酸之间的相互作用。计算不同几何结构的结合能范围为6—13kal／mol。研究发现，一些配合物之间显示出氢键，同时在没食子酸稳定蛋白质方面，静电作用占主导性，n—OH在维持多肽稳定性方面也起着一定的作用。600ps的分子动力学模拟（MD）说明，胶原多肽和没食子酸之间可能存在氢键。

关键词：分子动力学模拟相互作用位点没食子酸胶原多肽蛋白多肽分子力学配位化合物植物鞣剂

Multivariate statistical and bioinformatic analyses for the seasonal variations of actinobacterial community structures in a drinking water reservoir

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Journal of Environmental Sciences 2024年第3期137卷 1-17页

作者： Haihan Zhang Sixuan Pan benma Tinglin Huang Dmitry b.Kosolapov manli ma Xiang Liu Huan Liu Xiaoyan Liu Shaanxi Key Laboratory of Environmental Engineering Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Papanin Institute for biology of Inland Waters of Russian Academy of Sciences(IbIW RAS) 109BorokNekouzYaroslavl152742Russia

Actinobacterial community is a conspicuous part of aquatic ecosystems and displays an important role in the case of biogeochemical cycle,but little is known about the seasonal variation of actinobacterial community in reservoir ecological *** this study,the high-throughput techniques were used to investigate the structure of the aquatic actinobacterial community and its inducing water quality parameters in different *** results showed that the highest diversity and abundance of actinobacterial community occurred in winter,with Sporichthya(45.42%)being the most abundant genus and Rhodococcus sp.(29.32%)being the most abundant *** analysis and correlation analysis suggested that in autumn the dynamics of actinobacterial community were infuenced by more factors and Nocardioides ***2R5S2 was the potential keystone species which was negatively correlated with temperature(R=-0.72,Pbacterial community,and the dynamics of temperature,dissolved oxygen(DO),and turbidity are potential conspicuous factors infuencing seasonal actinobacterial community *** partial least squares path modeling further elucidated that the combined effects of DO and temperature not only in the diversity of actinobacterial community but also in other water qualities,while the physiochemical parameters(path coefficient=1.571,Pbacterial community in the drinking water reservoirs and provide scientific guidance for further water quality management and protection in water sources.

关键词： Source water reservoir High-throughput sequencing Correlation analysis Network analysis Partial least squares path modeling

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Experimental studies on the energy dissipation of bolted structures with frictional interfaces:A review

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Friction 2024年第8期12卷 1623-1654页

作者： Yongfeng WANG Yanhong ma Jie HONG Giuseppe b.ATTIATO Christian M.FIRRONE School of Energy and Power Engineering Beihang UniversityBeijing 102206China Research Institute of Aero-Engine Beihang UniversityBeijing 102206China Politecnico di Torino Department of Mechanical and Aerospace EngineeringTorino 10139Italy

bolted joints play a more and more important role in the structure with lighter weight and heavier *** paper aims to provide an overview of different experimental approaches for the dynamic behavior of structures in the presence of bolted joints,especially the energy dissipation or damping at frictional *** comprehension of energy dissipation mechanisms due to friction is provided first,while the key parameters and the measurement techniques,such as the excitation force,the preload of the bolt,or the pressure at the interfaces,are briefly ***,the round-robin systems aim to measure the hysteresis parameters of the frictional joints under tangential loads are reviewed,summarizing the basic theory and the strategies to apply the excitation force or acquire the response in different testing *** by parameter identification strategies for bolted structures,the test rigs with one or more simplified bolted joints are summarized to give an insight into the understanding of typical characteristics of bolted structures,which are affected by the presence of *** complex test rigs hosting real-like or actual engineering structures with bolted lap or flange joints are also introduced to show the identification process of the dynamic characteristics of bolted connections employed in specific *** on the review paper,researchers can get the basic knowledge about the experimental systems of the bolted structures,especially several classical round robin systems,such as the Gaul resonator and widely used brake-Reußbeam *** can take advantage of this background for more creative and effective future studies,make more progress on the study of assembled structures and understand the influence of bolting frictional connections on the dynamic response better.

关键词： review study bolted joints frictional damping experimental rigs measurements

Uniform decomposition of velocity gradient tensor

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Journal of Hydrodynamics 2024年第1期36卷 24-34页

作者： Chenxi ma Chaoqun Liu Department of mathematics University of Texas at ArlingtonArlingtonTXUSA

In this paper,the principal decomposition of the velocity gradient tensor[∇v]is discussed in 3 cases based on the discriminant∆:∆0 with 3 distinct real eigen values,and∆=0 with 1 or 2 distinct real eigen *** velocity gradient tensor can also be classified as rotation point,which can be decomposed into three parts,i.e.,rotation[R],shear[S]and stretching/compression[SC],and non-rotation point,we defined a new resistance term[L],and the tensor can be decomposed into three parts,i.e.,resistance[L],shear[S]and stretching/compression[SC].Example matric are also displayed to demonstrate the new *** of principal decomposition between 3 different cases,and between Resistance and Liutex will also be discussed.

关键词： Velocity gradient Liutex resistance fluid kinematics

Damping Characteristic Analysis and Optimization of Wind-thermal-bundled Power Transmission by LCC-HVDC Systems

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 299-312页

作者： Liwen Zheng Shiying ma the Power System Department China Electric Power Research InstituteBeijing 100192China

With the rapid development of renewable energy,wind-thermal-bundled power transmission by line-commutated converter based high-voltage direct current(LCC-HVDC)systems has been widely *** dynamic interaction mechanisms among permanent magnet synchronous generators(PMSGs),synchronous generators(SGs),and LCC-HVDC system become *** deal with this issue,a path analysis method(PAM)is proposed to study the dynamic interaction mechanism,and the damping reconstruction is used to analyze the damping characteristic of the ***,based on the modular modeling,linearized models for the PMSG subsystem,the LCC-HVDC subsystem,and the SG subsystem are ***,based on the closed-loop transfer function diagram of the system,the disturbance transfer path and coupling relationship among subsystems are analyzed by the PAM,and the damping characteristic analysis of the SG-dominated oscillation mode is studied based on the damping *** with the PAM,the small-signal model of the system is obtained and eigenvalue analysis results are ***,the effect of the control parameters on the damping characteristic is analyzed and the conclusions are verified by time-domain ***,the penalty functions of the oscillation modes and decay modes are taken as the objective function,and an optimization strategy based on the Monte Carlo method is proposed to solve the parameter optimization *** simulation results are presented to validate the effectiveness of the proposed strategy.

关键词： Wind-thermal-bundled power transmission line-commutated converter based high-voltage direct current(LCC-HVDC) path analysis method(PAM) damping characteristic analysis Monte Carlo method

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Mitigate noisy data for smart IoT via GAN based machine unlearning

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Science China(Information Sciences) 2024年第3期67卷 62-78页

作者： Zhuo ma Yilong YANG Yang LIU Xinjing LIU Jianfeng ma School of Cyber Engineering Xidian University State Key Laboratory of Integrated Services Networks (ISN)

With the development of IoT applications, machine learning dramatically improves the utility of variable IoT systems such as autonomous driving. Although the pretrain-finetune framework can cope well with data heterogeneity in complex IoT scenarios, the data collected by sensors often contain unexpected noisy data, e.g., out-of-distribution(OOD) data, which leads to the reduced performance of fine-tuned models. To resolve the problem, this paper proposes Mu GAN, a method that can mitigate the side-effect of OOD data via the generative adversarial network(GAN)-based machine unlearning. Mu GAN follows a straightforward but effective idea to mitigate the performance loss caused by OOD data, i.e., “flashbacking” the model to the condition where OOD data are excluded from model training. To achieve the goal, we design an adversarial game, where a discriminator is trained to identify whether a sample belongs to the training set by observing the confidence score. Meanwhile, a generator(i.e., the target model) is updated to fool the discriminator into believing that the OOD data are not included in the training set but others do. The experimental results show that benefiting from the high unlearning rate(more than 90%) and retention rate(99%), Mu GAN succeeds in lowering the model performance degradation caused by OOD data from 5.88% to 0.8%.

关键词： machine unlearning generative adversarial network out of distribution data Internet of Thing neural network