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在1.5T设备上应用3种不同对比剂以2种不同剂量(0.05和0.1mmol/kg)对猪进行对比增强MRA的评价研究

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国际医学放射学杂志 2011年第2期 200-201页

作者： M.Voth h.j.michaely C.Schwenke B.Vos h.Pietsch 唐光健 Institute of Clinical Radiology and Nuclear Medicine University Medical Center MannheimMedical Faculty MannheimUniversity of Heidelberg

目的总共8头猪进行个体间对照评价不同剂量(分别为0.05mmol/kg体质量与0.1mmol/kg体质量)的钆布醇、Gd-DTPA与Gd-BOPTA对主动脉弓以上血管在1.5T对

关键词：对比增强MRA 单剂量细胞外对比剂 MRA 钆布醇钆贝酸盐马根维显钆喷葡胺 Gd-BOPTA Gd-DTPA 个体间对照研究

比较新型全身连续动床MR检查方案与标准全身MR检查方案对多发性骨髓瘤的评估

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国际医学放射学杂志 2011年第1期34卷 99-100页

作者： S.Weckbach h.j.michaely A.Stemmer S.O.Schoenberg D.j.Dinter 麻智慧 Department of Clinical Radiology University Hospital Munich-Grosshadern Campus

目的评价全身(WB)连续动床(CTM)MR检查方案相对于分段全身MR检查方案对多发性骨髓瘤(MM)的评估作用。方法利用1.5TMR设备。

关键词：连续动床全身MRI 多发性骨髓瘤骨髓病变检测 Durie-Salmon Plus分期系统

Convexification of hybrid AC-DC Optimal Power Flow with Line-Commutated Converters

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CSEE journal of Power and Energy Systems 2024年第2期10卷 617-628页

作者： hongyuan Liang Zhigang Li j.h.Zheng Q.h.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

Line-commutated converter (LCC)-based high-voltage DC (hVDC) systems have been integrated with bulk AC power grids for interregional transmission of renewable power. The nonlinear LCC model brings additional nonconvexity to optimal power flow (OPF) of hybrid AC-DC power grids. A convexification method for the LCC station model could address such nonconvexity but has rarely been discussed. We devise an equivalent reformulation for classical LCC station models that facilitates second-order cone convex relaxation for the OPF of LCC-based AC-DC power grids. We also propose sufficient conditions for exactness of convex relaxation with its proof. Equivalence of the proposed LCC station models and properties, exactness, and effectiveness of convex relaxation are verified using four numerical simulations. Simulation results demonstrate a globally optimal solution of the original OPF can be efficiently obtained from relaxed model.

关键词： AC-DC power system convex relaxation linecommutated converter optimal power flow second-order cone programming

Observability Analysis of Integrated Electricity and heating Systems with Thermal Quasi-dynamics in Pipelines

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CSEE journal of Power and Energy Systems 2024年第3期10卷 1145-1158页

作者： Zhigang Li Wenjian Zheng junbo Zhao j.h.Zheng Q.h.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China Fuzhou Changle District Power Supply Company of State Grid Fujian Electric Power Co. Ltd.Fuzhou 350000China Department of Electrical and Computer Engineering University of ConnecticutStorrsCT 06269USA CSEE IEEE

Observability analysis(OA)is vital to obtaining the available input measurements of state estimation(SE)in an integrated electricity and heating system(IEhS).Considering the thermal quasi-dynamics in pipelines,the measurement equations in heating systems are dependent on the estimated results,leading to an interdependency between OA and *** OA methods require measurement equations be known exactly before SE is performed,and they are not applicable to *** bridge this gap,a scenario-based OA scheme for IEhSs is devised that yields reliable analysis results for a predefined set of time-delay scenarios to cope with this *** its core procedure,the observable state identification and observability restoration are formulated in terms of integer linear *** tests are conducted to demonstrate the validity and superiority of the proposed formulation.

关键词： Integrated electricity and heating system measurement observability analysis state estimation thermal quasi-dynamics

7TMR人体肾脏体内23Na成像:初步的研究结果

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国际医学放射学杂志 2014年第2期 201-202页

作者： S.haneder V.juras h.j.michaely X.Deligianni O.Bieri S.O.Schoenberg 肖雅雯 Institute of Clinical Radiology and Nuclear Medicine University Medical Center Mannheim Heidelberg University Theodor Kutzer -Ufer 1 -3 68167 MannheimGermany

目的评估人体肾脏皮髓质23Na梯度体内23Na成像的可行性,并测量人体肾脏的23Na的T2*序列的弛豫时间。方法本项前瞻性研究经机构审查委员会批准,8例健康

关键词：人体肾脏 7 T 23Na成像 T2*弛豫时间肾皮髓质23Na梯度

Dissociation cross sections ofψ(3770),ψ(4040),ψ(4160),andψ(4415)mesons with nucleons

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Communications in Theoretical Physics 2024年第4期76卷 93-112页

作者： Ruo-Qing Ding Xiao-Ming Xu h j Weber Department of Physics Shanghai UniversityBaoshanShanghai 200444China Department of Physics University of VirginiaCharlottesvilleVA 22904United States of America

We study the dissociation of ψ(3770), ψ(4040), ψ(4160), and ψ(4415) mesons in collision with nucleons, which takes place in high-energy proton-nucleus collisions. The quark interchange between a nucleon and a ■ meson leads to the dissociation of the ■ meson. We consider the reactions:■, and■, where R stands for ψ(3770), ψ(4040), ψ(4160), or ψ(4415). A reaction of a neutron and a ■ meson corresponds to a reaction of a proton and the ■ meson by replacing the up quark with the down quark and vice versa. Transition-amplitude formulas are derived from the S-matrix *** cross sections are calculated with the transition amplitudes for scattering in the prior form and in the post form. The cross sections relate to nodes in the radial wave functions of ψ(3770), ψ(4040), ψ(4160), and ψ(4415) mesons.

关键词： inelastic nucleon-charmonium scattering quark interchange relativistic constituent quark potential model

利用3.0TMRI的化学交换饱和转移成像技术评估椎间盘内的葡糖胺聚糖成分:在腰背痛病人中的初步研究

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国际医学放射学杂志 2013年第3期 293-294页

作者： S.haneder S.R.Apprich B.Schmitt h.j.michaely S.O.Schoenberg K.M.Friedrich 楼敏超 Department of Radiology Centre for High-Field MRMedical University of Vienna

目的通过评估3TMRI的葡糖胺聚糖相关化学交换饱和转移(gagCEST)成像来定量分析腰背痛(LBP)病人椎间盘内(IVD)的葡糖胺聚糖(GAG)含量。方法在这项经机构审查委员会批准的研究中共有16例腰背痛病人接受了MR全身成像系统的检查。MRI检查序... 详细信息

目的通过评估3TMRI的葡糖胺聚糖相关化学交换饱和转移(gagCEST)成像来定量分析腰背痛(LBP)病人椎间盘内(IVD)的葡糖胺聚糖(GAG)含量。方法在这项经机构审查委员会批准的研究中共有16例腰背痛病人接受了MR全身成像系统的检查。MRI检查序列包括标准的形态学成像、矢状位T2图和gagCEST成像图。通过Pfirrmann分级和在gagCEST和T2图上对纤维环(AF)和髓核(NP)进行感兴趣区分析来评估椎间盘退变的分级,然后检测不同椎间盘退变分级之间影像技术和定量差异方面的统计学相关性。结果变性椎间盘(Pfirrmann3+4)的髓核gagCEST值显著低于非变性椎间盘(Pfirrmann1+2)(P<0.001),但其与T2值仅呈弱线性相关(r=0.299)。髓核的gagCEST值与Pfirrmann分级呈中度负相关(r=-0.449)。结论根据所知的随着形态学退变级别的增加而逐渐流失的髓核中的GAG可以利用3.0TMR的gagCEST成像来评估。单纯Pfirrmann分级和T2值的相关性似乎只呈中度相关,这提示不同技术提供的信息之间存在本质区别。要点①3TMRI提供了腰椎间盘退变相关的新功能数据。②gagCEST成像可以评估葡糖胺聚糖的流失。③gagCEST成像和T2图提供的关于椎间盘退变的信息存在本质区别。④葡糖胺聚糖的流失与椎间盘形态学退变分级之间仅呈中度相关。

关键词： gagCEST 3.0T 椎间盘腰背痛 Pfirrmann分级

Editorial for the Special Issue on Emerging Technology and Advanced Application of Nondestructive Detection for Power Equipment

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Chinese journal of Electrical Engineering 2024年第1期10卷 1-2页

作者： Li j. Mei h. Li S. Tianjin University China Tsinghua Shenzhen International Graduate School China Lanzhou jiaotong University China

The rapid development of clean and renewable energy technologies represented by wind and solar energy,as well as the continuous growth of load demand,have put forward higher requirements for the safe operation of the power *** performance of power equipment based on traditional dielectric materials is often limited by various defects generated during molding,transportation,assembly,and operation,which cannot meet the reliability requirements of power systems in the new *** detection is an essential technical method in industrial development,which can detect and evaluate the defect and damage status of in-service equipment,key components,and materials without damaging the object.

关键词： service Application operation

Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms

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journal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： h.T.jeong S.W.Lee W.j.Kim Department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the hCPαphase,were examined in a temperature range of 473 K to 623 *** microstructural refinement of this alloy was achieved by employing high-ratio differential speed *** best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were *** the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 ***,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and *** the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation *** was concluded that solute drag creep is unlikely to *** the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain *** mechanism maps were constructed forβ-Mg-Li alloys in the form of 2D and 3D formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests.

关键词： Magnesium-lithium alloy Superplasticity Severe plastic deformation Grain size Grain growth