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功能mR成像无创性定量分析肺段过敏原激发的气道炎症:一项概念验证型研究

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国际医学放射学杂志 2015年第2期 172-173页

作者： J.Renne J.Hinrichs C.Schonfeld m.gutberlet C.Winkler C.Faulenbach 赵芳 Department of diagnostic and interventional radiology Hannover Medical School Biomedical research in endstage and obstructive lung disease hanover (BREATH) Member of the German Center for Lung Research OE 8220 Carl -Neuberg -Str 1 30625 Hannover Germany

摘要目的评估氧气增强T1-mapping mR成像可以作为一种无创性的方法来可视化和量化经肺段过敏原激发的哮喘病人的局部炎症。材料与方法 9例哮喘病人和4名正常

关键词：气道炎症 mR成像肺段哮喘病人局部炎症验证型嗜酸性粒细胞标准剂量弛豫时间知情同意书

原发性硬化性胆管炎病人的钆塞酸二钠增强功能mRI研究

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国际医学放射学杂志 2016年第3期 335-336页

作者： H.Hinrichs J.B.Hinrichs m.gutberlet H.Lenzen H.J.Raatschen F.Wacker 祁丽 Department of Diagnostic and Interventional Radiology Hannover Medical School

摘要目的探讨钆塞酸二钠增强肝脏T1mapping mRI的可变翻转角在原发硬化性胆管炎(PSC)病人中的应用价值,评估全肝和肝段肝功能,并确定其与疾病的严重程度的相关性。方法本前瞻性研究共纳入61例(女19例,男42例,平均年龄41岁)PSC病人。在... 详细信息

摘要目的探讨钆塞酸二钠增强肝脏T1mapping mRI的可变翻转角在原发硬化性胆管炎(PSC)病人中的应用价值,评估全肝和肝段肝功能,并确定其与疾病的严重程度的相关性。方法本前瞻性研究共纳入61例(女19例,男42例,平均年龄41岁)PSC病人。在对比剂注入前、注入后16 min(HP1)及132 min(HP2)后分别用3D GRE序列行T1mapping

关键词：钆塞酸二钠原发性硬化性胆管炎 mRI 病人

Dysferlin缺陷性肌营养不良症:gadofluorine m在小鼠模型mRI的适合性

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国际医学放射学杂志 2009年第2期32卷 176-176页

作者： S.Schmidt A.Vieweger m.Obst S.mueller V.Gross m.gutberlet 陈聪 muscle Research Unit Experimental and Clinical Research CenterCharité University Medicine Berlin

目的比较gadofluorine m和Gadomer在7．0T mRI上评估Dysferlin缺陷性肌营养不良症的有效性。方法实验经当地审查委员会批准通过。患Dysferlin缺陷性肌营养不良症的SJL／J小鼠（n=24）和对照组C57BL／6小鼠（n=24）在12～15周（青年... 详细信息

目的比较gadofluorine m和Gadomer在7．0T mRI上评估Dysferlin缺陷性肌营养不良症的有效性。方法实验经当地审查委员会批准通过。患Dysferlin缺陷性肌营养不良症的SJL／J小鼠（n=24）和对照组C57BL／6小鼠（n=24）在12～15周（青年）或30周（老年）静脉注射动态增强对比剂gadofluorine m 2 μmol或Gadomer 4 μmol，在静注前、中、后行mRI预反转自由稳态进动序列成像。

关键词：肌营养不良症小鼠模型 mRI 缺陷适合性 C57BL/6小鼠动态增强静脉注射

自由呼吸动态19F-mRI在慢性阻塞性肺疾病病人局部肺通气中的应用

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国际医学放射学杂志 2018年第3期 349-349页

作者： m.gutberlet T.F.Kaireit A.Voskrebenzev F.Lasch J.Freise T.Welte 吕晓虹 Institute for Diagnostic and Interventional Radiology Institute of Biometry and Clinic of PneumologyHannover Medical School

摘要目的评估自由呼吸动态19F-气体mR成像在慢性阻塞性肺疾病(COPD)病人中局部肺通气的应用价值。材料与方法本前瞻性研究经机构伦理委员会批准,共纳入了

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利用mRT1 mapping技术评估实体器官移植后急性肾损伤

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国际医学放射学杂志 2018年第2期 235-235页

作者： m.Peperhove V.D.V.Chieu m.S.Jang m.gutberlet D.Hartung S.Tewes 于美霞 Diagnostic and Interventional Radiology Hannover Medical School

摘要目的 mR T1mapping技术是一种无创性的检查,也是一种功能mR生物标志物,利用其评估接受实体器官移植病人手术后短期内的急性肾损害,并研究T1与肾功能的

关键词： mRT1 mapping 器官移植肾损伤

Influence of cerium ions on structure-dependent magnetic properties of Ba-Sr m-type hexaferrite nanocrystals

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Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.Pawar Sunil m.Patange P.m.Dighe Sher Singh meena Abdullah GAl-Sehemi mehboobali Pannipara Santosh S.Jadhav Department of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Department of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padmashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Department of Chemistry King Khalid UniversityAbha61413Saudi Arabia Department of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted Ba-Sr hexaferrite nanocrystals chemically formulated as Ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by means of powder X-ray diffraction and Fourier transform infrared *** creation of the m-type hexaferrite phase within the synthesized samples was revealed from the Rietveld refinement of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to compute the lattice parameters,X-ray density,and lattice parameter *** crystal structure plotted from the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommodated in the lattice and the remaining Ce content reside in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed from the FESEm profiles of the ferrite *** magnetic behavior study was performed by analyzing the Curie temperature,hysteresis loops,and hyperfine interactions by means of susceptibility,V.S.m,and mossbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation magnetization,and decreasing Curie temperature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice imperfections giving rise to hexaferrites with tuned magnetic parameters suitable for different applications.

关键词： Ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation magnetization Coercivity m?ssbauer spectroscopy

Frequency-dependent viscoelasticity effects on the wave attenuation performance of multi-layered periodic foundations

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 407-424页

作者： m.SAFI m.VAKILIFARD m.J.mAHmOODI Faculty of Civil Water&Environmental EngineeringShahid Beheshti UniversityTehran ***Iran Faculty of mechanical and Energy Engineering Shahid Beheshti UniversityTehran ***Iran

In this paper,layered periodic foundations(LPFs)are numerically examined for their responses to longitudinal and transverse modes in the time and frequency *** different unit-cells,i.e.,2-layer,4-layer,and 6-layer unit-cells,comprising concrete/rubber,concrete/rubber/steel/rubber,and concrete/rubber/steel/rubber/lead/rubber materials,respectively,are taken into ***,the viscoelasticity behavior of the rubber is modeled with two factors,i.e.,a frequency-independent(FI)loss factor and a linear frequency-dependent(FD)loss *** the extraction of the complex dispersion curves and the identification of the band gaps(BGs),the simulations of wave transmission in the time and frequency domains are performed using the COmSOL *** parametric studies evaluate the effects of the rubber viscoelasticity models on the dispersion curves and the wave transmission for the longitudinal and transverse *** results show that considering the rubber viscoelasticity enhances the wave attenuation ***,the transverse-mode damping is more sensitive to the viscoelasticity model than its longitudinal *** 6-layer unit-cell LPF exhibits the lowest BG,ranging from 4.8 Hz to 6.5 Hz.

关键词： layered metamaterial periodic foundation complex dispersion curve wave transmission diagram

Engineering of efficient visible light photocatalysts:Ti_(1-x+y)Cu_(x)La_(y)O_(2)(x=0.03;y=0,0.005,0.01) compositions

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Journal of Rare Earths 2024年第3期42卷 497-505,I0003页

作者： S.m.Yakout A.m.Youssef Inorganic Chemistry Department National Research Centre(NRC)El Buhouth StDokkiCairo12622Egypt

In dye-photocatalysis, widening the wavelengths absorption range of catalysts as well as aborting the recombination of the photoexcited charge carriers(electrons-holes pairs) are of paramount *** the current study, we report the photocatalytic characteristics of four compositions composed of TiO_(2),Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders for two harmful dyes(Congo red and methylene blue). The X-ray diffraction technique verified the configuration of mixed anatase and rutile phases in pure TiO_(2)and Ti_(0.97)Cu_(0.03)O_(2)powders while Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders possess anatase phase only. The changes of the band gap structure and dimensions of the unit cell volume of TiO_(2)confirm the substitution of Ti^(4+)sites by Cu^(2+)and La^(3+)ions. Remarkable widening of wavelengths absorption with formation of long absorption tails were found in TiO_(2)(3.13 e V) through insertion of La^(3+)plus Cu^(2+)ions. Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)samples exhibit a visible light band gap of 2.3 and 2.7 e V, respectively. Based on SEm images, incorporation of Cu^(2+)and La^(3+)ions influences the surface morphology of TiO_(2). The resulting Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders present enhanced photocatalytic activity towards Congo red dye degradation compared to pure one under natural solar spectrum. The best Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst exhibits superior photocatalytic activity of 96% for 10 ppm CR dye in 20 min as well as above average photocatalytic efficiency of 63% for 30 ppm CR dye in 120 min. As well, it showed acceptable photodegradation activity of 52% for 30 ppm mB solution in 140 min of sunlight irradiation. The heightened photodegradation efficiency of Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst can be clarified in terms of higher ch

关键词： Semiconductor TiO_(2) Rare earths Congo red methylene blue Solar spectrum Photodegradation

Nonlinear dynamic modeling of planar moving Timoshenko beam considering non-rigid non-elastic axial effects

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 479-496页

作者： m.ABBASI GAVARI m.R.HOmAEINEZHAD Faculty of mechanical Engineering K.N.Toosi University of TechnologyTehran 19991-43344Iran

Due to the importance of vibration effects on the functional accuracy of mechanical systems,this research aims to develop a precise model of a nonlinearly vibrating single-link mobile flexible *** manipulator consists of an elastic arm,a rotary motor,and a rigid carrier,and undergoes general in-plane rigid body motion along with elastic transverse *** accurately model the elastic behavior,Timoshenko’s beam theory is used to describe the flexible arm,which accounts for rotary inertia and shear deformation *** applying Newton’s second law,the nonlinear governing equations of motion for the manipulator are derived as a coupled system of ordinary differential equations(ODEs)and partial differential equations(PDEs).Then,the assumed mode method(Amm)is used to solve this nonlinear system of governing equations with appropriate shape *** assumed modes can be obtained after solving the characteristic equation of a Timoshenko beam with clamped boundary conditions at one end and an attached mass/inertia at the *** addition,the effect of the transverse vibration of the inextensible arm on its axial behavior is *** the axial rigidity,the effect makes the rigid body dynamics invalid for the axial behavior of the ***,numerical simulations are conducted to evaluate the performance of the developed model,and the results are compared with those obtained by the finite element *** comparison confirms the validity of the proposed dynamic model for the *** to the mentioned features,this model can be reliable for investigating the system’s vibrational behavior and implementing vibration control algorithms.

关键词： planar moving Timoshenko beam non-rigid non-elastic axial effect as-sumed mode method(Amm) nonlinear motion analysis