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扩散加权mRI诊断神经内分泌肿瘤肝转移瘤的高敏感性:与T2WI和动态钆剂增强mRI比较

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国际医学放射学杂志 2013年第5期 479-480页

作者： G.d’Assignies p.Fina O.Bruno m.p.vullierme F.Tubach V.paradis 罗宴吉 Departments of Radiology Assistance-Publique Hpitaux de ParisHpital Beaujon

摘要目的比较扩散加权mRI、T2WI快速自旋回波、3D动态钆剂增强mRI诊断神经内分泌肿瘤肝转移瘤的敏感性和特异性,以手术和免疫病理学检查结果为参照标准。材料与方法该回顾性研究经伦理委员会批准,免除病人知情同意。神经内分泌肿瘤59例... 详细信息

摘要目的比较扩散加权mRI、T2WI快速自旋回波、3D动态钆剂增强mRI诊断神经内分泌肿瘤肝转移瘤的敏感性和特异性,以手术和免疫病理学检查结果为参照标准。材料与方法该回顾性研究经伦理委员会批准,免除病人知情同意。神经内分泌肿瘤59例(其中41例有肝转移瘤162个,18例无肝转移瘤作为对照),mRI检查序列包括DWI、T2WI快速自旋回波序列和动态钆剂增强序列。由2名腹部放射医师独立地回顾性分析评估影像,发现并描述肝转移瘤的特征。比较每个肝内病灶mRI表现、组织病理学表现及术中超声表现以确定mRI各序列或序列组合诊断的敏感性。与对照

关键词：肝转移瘤敏感性 T2WI 神经内分泌 mRI 扩散加权

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

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Selection of digital fabrication technique in the construction industry--A multi-criteria decision-making approach

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 977-997页

作者： m.p.SALAImANImAGUDAm J.JAYApRAKASH Department of Structural and Geotechnical Engineering School of Civil EngineeringVellore Institute of TechnologyVellore 632014India

Digital fabrication techniques,in recent decades,have provided the basis of a sustainable revolution in the construction ***,selecting the digital fabrication method in terms of manufacturability and functionality requirements is a complex *** paper presents alternatives and criteria for selection of digital fabrication techniques by adopting the multi-criteria decision-making *** alternatives considered in the study are concrete three-dimensional(3D)printing,shotcrete,smart dynamic casting,material intrusion,mesh molding,injection concrete 3D printing,and thin forming *** criteria include formwork utilization,reinforcement incorporation,geometrical complexity,material enhancement,assembly complexity,surface finish,and build *** demonstrates different multi-criteria decision-making techniques,with both subjective and objective weighting *** given ranking is based on the current condition of digital fabrication in the construction *** study reveals that in the selection of digital fabrication techniques,the criteria including reinforcement incorporation,build area,and geometrical complexity play a pivotal role,collectively accounting for nearly 70% of the overall *** the evaluated techniques,concrete 3D printing emerged as the best performer,however the shotcrete and mesh molding techniques in the second and third positions.

关键词： digital fabrication multicriteria decision-making concrete 3D printing

Intertype superconductivity evoked by the interplay of disorder and multiple bands

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Frontiers of physics 2024年第4期19卷 81-89页

作者： p.m.marychev A.A.Shanenko A.V.Vagov HSE University 101000 MoscowRussia Center for Advanced mesoscience and Nanotechnology MIPTDolgoprudny141700Russia

Nonmagnetic impurity scattering is known to shift up the Ginzburg-Landau parameter k of a *** this case,when the system is initially in type I,it can change its magnetic response,crossing the intertype domain with k~1 between the two standard superconductivity types and arriving at type *** the present work we demonstrate that the impact of disorder can be much more profound in the presence of the multiband structure of the charge carrier *** particular,when the band diffusivities differ from each other,the intertype domain tends to expand significantly,including points with k>>1 that belong to deep type-Ⅱ in conventional single-band *** finding sheds light on the nontrivial disorder effect and significantly complements earlier results on the enlargement of the intertype domain in clean multiband superconductors.

关键词： superconductivity disorder intertype superconductivity twoband model

mRI包括DWI特征预测胰腺神经内分泌肿瘤等级

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国际医学放射学杂志 2017年第3期 370-370页

作者： E.Lotfalizadeh m.Ronot m.Wagner J.Cros A.Couvelard m.p.vullierme 赵芳 Department of Radiology University Hospitals Paris Nord Val de Seine

摘要目的评价mRI包括DWI对胰腺神经内分泌肿瘤（p NET）分级的意义。方法研究纳入2006—2014年所有切除的p NET,术前均行mRI检查,包括DWI。肿瘤分级以2010 WHO分级为标准。mRI特征包括肿瘤大小、T1WI及T2WI信号强度、强化方式、表观扩... 详细信息

摘要目的评价mRI包括DWI对胰腺神经内分泌肿瘤（p NET）分级的意义。方法研究纳入2006—2014年所有切除的p NET,术前均行mRI检查,包括DWI。肿瘤分级以2010 WHO分级为标准。mRI特征包括肿瘤大小、T1WI及T2WI信号强度、强化方式、表观扩散系数（ADC）及真实扩散系数（D）。结果研究94例病人[女48例,51%,平均年龄（52±12）岁]的108个pNET[平均大小（40±33）mm]。55个（51%）肿瘤为G1、42个（39%）为G2、11个（10%）为G3。肿瘤等级越高,平均ADC及D值明显降低[G1、G2、G3的ADC

关键词： DWI mRI 胰腺神经内分泌肿瘤

mechanisms behind the environmental sensitivity of carbon fiber reinforced polytetrafluoroethylene(pTFE)

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Friction 2024年第5期12卷 997-1015页

作者： pontus JOHANSSON p.mARKLUND m.BJORLING Y.SHI Division of machine Element LuleåUniversity of TechnologyLuleåSE-97187Sweden

Carbon fiber reinforced polytetrafluoroethylene (CF/pTFE) composites are known for their exceptional tribological performance when sliding against steel or cast iron in inert gas environments. Compared to experiments in humid air, about an order of magnitude lower wear rate and several times lower coefficient of friction have been reported for tests conducted in dry nitrogen and hydrogen. moreover, trace moisture has been shown to affect the friction and wear significantly of this tribosystem, although a possible effect of oxygen cannot be ruled out due to uncertainties regarding the oxygen concentrations. While several studies have pointed out the environmental sensitivity of CF/pTFE, the understanding of the underlying mechanisms are very limited. The objective of this research is to investigate the individual and combined effect of oxygen and moisture on the tribological behavior of CF/pTFE sliding against steel. Additionally, this study aims to elucidate the underlying mechanisms that govern the environmental sensitivity of the system. Climate-controlled three-pin-on-disc experiments were conducted in nitrogen atmospheres at various concentrations of oxygen and moisture. The tribological results clearly demonstrate that both moisture and oxygen contribute to increased friction and wear. However, the adverse effect was much more pronounced for oxygen than moisture. A qualitative method was developed to estimate the tribofilm coverage on the CF/pTFE surface. Results showed strong correlation between high coverage of strongly adhered tribofilm and low wear rate. moreover, a loosely adhered tribofilm was observed on top of the CF/pTFE surface in presence of moisture. FTIR analysis indicated that the loosely adhered tribofilm found in the moisture-enriched environment contained a significant amount of adsorbed water, which may explain the lower coefficient of friction in presence of moisture compared to oxygen. The adsorbed water in the loosely adhered tribofilm coul

关键词： polymer composite tribofilm tribochemistry atmosphere

Drought events influence nutrient canopy exchanges and green leaf partitioning during senescence in a deciduous forest

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Forest Ecosystems 2024年第1期11卷 110-119页

作者： J.Touche C.Calvaruso p.De Donato m.-p.Turpault INRAE BEFF-54000NancyFrance UmR 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events expected in the coming decades in Western Europe may disturb forest biogeochemical cycles and create nutrient deficiencies in *** possible origin of nutrient deficiency is the disturbance of the partitioning of the green leaf pool during the leaf senescence period between resorption,foliar leaching and senesced ***,the effects of drought events on this partitioning and the consequences for the maintenance of tree nutrition are poorly *** experiment in a beech forest in meuse(France)was conducted to assess the effect of drought events on nutrient canopy exchanges and on the partitioning of the green leaf pool during the leaf senescence *** aim was to identify potential nutritional consequences of droughts for *** nutrient dynamics,including resorption,chemistry of green and senesced leaves,foliar absorption and leaching in mature beech stands from 2012 to 2019 allowed us to compare the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by almost a third of the potassium(K)partitioning to resorption(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity expected for the coming decades,there will be a risk of potassium deficiency in trees,as already observed in a rainfall exclusion experiment on the same study *** foliar leaching and higher parititioning to the senesced leaves for K and phosphorus(p)were also *** addition,a slight increase in nitrogen(N)resorption efficiency occurred during dry years which is more likely to improve tree *** calcium(Ca)negative resorption decreased,with no apparent consequence in our study *** results show that nutrient exchanges in the canopy and the partitioning of the green leaf

关键词： Natural drought Beech forest Canopy Resorption Foliar leaching Senesced leaves Nutrition

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右肝切除后7天肝脏再生的全肝与肝脏分段CT容积分析

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国际医学放射学杂志 2009年第5期32卷 496-496页

作者： m.Zappa F.Dondero A.Sibert m.p.vullierme J.Belghiti V.Vilgrain 唐光健 Department of Radiology Höpital Beaujon100 boulevard du Gé né ral Leclerc92110 ClichyFrance

目的通过术前CT容积估算与右肝切除术后7天CT容积估算对照，评价肝脏的总体再生与分段再生，并研究不同手术指征及保留与不保留肝中静脉（mHV）病人CT容积估算，评估肝脏的再生。材料与方法研究经本地医学伦理委员会与国家医学委员会批... 详细信息

目的通过术前CT容积估算与右肝切除术后7天CT容积估算对照，评价肝脏的总体再生与分段再生，并研究不同手术指征及保留与不保留肝中静脉（mHV）病人CT容积估算，评估肝脏的再生。材料与方法研究经本地医学伦理委员会与国家医学委员会批准并获取知情同意通知。27例曾行右肝切除的病人术前与术后7天接受了多层螺旋CT扫描。

关键词：多层螺旋CT扫描肝脏分段肝脏再生医学伦理委员会切除后肝切除术后积分右肝

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选择性经动脉化疗栓塞在耐受性、肿瘤反应及生存期的效果研究

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国际医学放射学杂志 2011年第5期 507-507页

作者： A.Bouvier V.Ozenne C.Aubé J.Boursier m.p.vullierme F.Thouveny 王翠 Département de radiologie CHU Angers4rue Larrey49933 AngersFrance

目的比较选择性和非选择性经动脉化疗栓塞(TACE)技术在治疗肝细胞癌(HCC)的疗效,重点探讨临床与肝脏的耐受性、肿瘤反应及病人生存期。方法回顾性收集

关键词：肝细胞癌经动脉化疗栓塞选择性技术耐受性生存期肿瘤反应