检索结果-南通市图书馆

质子密度脂肪分数作为一种定量影像学生物标志物的线性及偏倚：一项多中心、多平台、多供应商的体模研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2021年第3期44卷 353-354页

作者： H.H.Hu T.Yokoo M.R.Bashir C.B.Sirlin d.hernando d.Malyarenko 魏锋

摘要通过化学位移编码(CSE)MRI估算的质子密度脂肪分数(PdFF)是一种公认的评价肝脂肪变性的影像学生物标志物。这项研究旨在促进标准化使用CSE MRI来估计

关键词：

Highly divergent sympatric lineages of Leptotila verreauxi(Aves:Columbidae)suggest a secondary contact area in the Isthmus of Tehuantepec,Mexico

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Avian Research 2024年第1期15卷 12-21页

作者： Orlando J.Espinosa-Chávez Adolfo G.Navarro-Sigüenza hernando Rodríguez-Correa Luis A.Sánchez-González Museo de Zoología“Alfonso L.Herrera” Depto.de Biología EvolutivaFacultad de CienciasUniversidad Nacional Autonoma de MexicoApdo.Postal 70-399CP 04510Ciudad de MexicoMexico Posgrado en Ciencias Biologicas Unidad de PosgradoEdificio D1◦PisoCircuito de PosgradosCiudad UniversitariaUniversidad Nacional Autonoma de MexicoCoyoacanCP 04510CDMXMexico Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autonoma de Mexico.Antigua Carretera a Patzcuaro No.8701 Col.Ex Hacienda de San Jose de la HuertaC.P.58190MoreliaMichoacanMexico

due to a complex geological and biotic history,the Isthmus of Tehuantepec(IT),has been long recognized as a driver for the evolutionary divergence of numerous lowland and highland *** distributed in the lowlands of the American continent,the White-Tipped dove(Leptotila verreauxi)is a polytypic species with 13 recognized *** of these have been recorded in Mexico,and the distribution of three abuts at the IT,suggesting a contact *** estimate phylogenetic patterns,divergence times and genetic differentiation,we examined two mt dNA(Nd2 and COI)and one n dNA(β-fibint 7)*** also used correlative ecological niche models(ENM)to assess whether ecological differences across the IT may have acted as a biogeographical *** estimated paleodistributions during the Middle Holocene,Last Glacial Maximum and Last Interglacial,to evaluate the influence of climate changes on the distribution and demographic *** results showed genetically distinct lineages that diverged approximately 2.5 million years *** and ecological factors may have played a dual role in promoting differentiation,but also in the formation of a secondary contact zone in the southern *** ecological niche comparisons indicated that the ecological niche of sympatric lineages at the IT are not identical,suggesting niches divergence;in addition,environmental niche models across the region indicated no abrupt biogeographic barriers,but the presence of regions with low *** results suggest that genetic differentiation originated by a vicariant event probably related to environmental factors,favored the evolution of different ecological ***,the absence of a biogeographic barrier but the presence of less suitable areas in the contact regions,suggest that secondary contact zones may be also maintained by climatic factors for the eastern group,but also by biotic interactions for the western group.

关键词： Biogeographical boundary Humid and dry forests Isthmus of Tehuantepec Phylogeography Secondary contact

维普期刊数据库

基于1.5 T和3.0 T MRI的肝铁定量的多中心可重复性研究

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2023年第2期 235-235页

作者： d.hernando R.Y.Zhao Q.Yuan M.A.Ghasabeh S.Ruschke X.Miao 李知琪

摘要 MRI是测量肝铁浓度（LIC）的标准工具。与监管部门批准的R2MR成像相比，R2*MR成像具有优越的扫描速度，并可在大多数MRI扫描设备中实现；然而，基于R2*的

关键词：

质子密度脂肪分数及R2*估测作为评价骨质疏松的MRI手段

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2014年第1期 99-100页

作者： J.P.Kühn d.hernando P.J.Meffert S.Reeder N.Hosten R.Laqua 袁涛 department of diagnostic Radiology and Neuroradiology Medical University GreifswaldSauerbruch-Strasse 117489 Greifswald Germany

目的探讨基于MRI图的多回波化学位移标记的质子加权脂肪分数(PdFF)与骨髓的脂肪校正R2*作为评价骨质疏松的生物学标志。方法41例[女28例,平均(69.7±

关键词： MRI 骨质疏松骨质减少化学位移横向弛豫率

Advancing Wound Filling Extraction on 3d Faces:An Auto-Segmentation and Wound Face Regeneration Approach

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第5期139卷 2197-2214页

作者： duong Q.Nguyen Thinh d.Le Phuong d.Nguyen Nga T.K.Le H.Nguyen-Xuan department of Mathematics and Statistics Quy Nhon UniversityQuy Nhon City55100Viet Nam Applied Research Institute for Science and Technology Quy Nhon UniversityQuy Nhon City55100Viet Nam CIRTECH Institute HUTECH UniversityHo Chi Minh City72308Viet Nam

Facial wound segmentation plays a crucial role in preoperative planning and optimizing patient outcomes in various medical *** this paper,we propose an efficient approach for automating 3d facial wound segmentation using a two-stream graph convolutional *** method leverages the Cir3d-FaIR dataset and addresses the challenge of data imbalance through extensive experimentation with different loss *** achieve accurate segmentation,we conducted thorough experiments and selected a high-performing model from the *** selectedmodel demonstrates exceptional segmentation performance for complex 3d facial ***,based on the segmentation model,we propose an improved approach for extracting 3d facial wound fillers and compare it to the results of the previous *** method achieved a remarkable accuracy of 0.9999993% on the test suite,surpassing the performance of the previous *** this result,we use 3d printing technology to illustrate the shape of the wound *** outcomes of this study have significant implications for physicians involved in preoperative planning and intervention *** automating facial wound segmentation and improving the accuracy ofwound-filling extraction,our approach can assist in carefully assessing and optimizing interventions,leading to enhanced patient ***,it contributes to advancing facial reconstruction techniques by utilizing machine learning and 3d bioprinting for printing skin tissue *** source code is available at https://***/SIMOGroup/WoundFilling3d.

关键词： 3d printing technology face reconstruction 3d segmentation 3d printed model

中等b值激励回波扩散加权成像在前列腺癌检测中的应用

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2020年第4期 501-501页

作者： Y.Zhang S.A.Wells B.L.Triche F.Kelcz d.hernando 魏锋 department of Medical Physics University of Wisconsin Madison

目的常规自旋回波(SE)扩散加权成像(dWI)的影像质量受b值影响很大:高b值影像的对比噪声比(CNR)更好,但要降低一些信噪比(SNR)、影像质量和定量测量的

关键词：

Snapshot imaging of ultrashort electron bunches

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第7期13卷 1226-1228页

作者： Andreas döpp Ludwig-Maximilian-Universität München Am Coulombwall 185748GarchingGermany Max Planck Institut für Quantenoptik Hans-Kopfermann-Strasse 1Garching85748Germany

New measurements combine spatial and temporal information from optical transition radiation to estimate the three-dimensional structure of electron bunches from a laser wakefield accelerator.

关键词： ultrashort Snapshot electron

复合混杂因素校正R2*mapping在肝脏铁MRI定量中的应用

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2021年第2期44卷 241-241页

作者： d.hernando R.J.Cook N.Qazi C.A.Longhurst C.A.diamond S.B.Reeder 王萱

摘要目的基于MRI的R2*mapping可以可靠、快速地定量肝脏铁浓度（LIC）。然而,R2*在不同采集协议中的表现和可重复性仍然未知。因此,本研究旨在评估复合混杂因素

关键词：

Influence of variable viscosity and double diffusion on the convective stability of a nanofluid flow in an inclined porous channel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 563-580页

作者： N.HUMNEKAR d.SRINIVASACHARYA department of Mathematics National Institute of TechnologyWarangal 506004TelanganaIndia

The influence of variable viscosity and double diffusion on the convective stability of a nanofluid flow in an inclined porous channel is *** darcyBrinkman model is used to characterize the fluid flow dynamics in porous *** analytical solutions are obtained for the unidirectional and completely developed *** on a normal mode analysis,the generalized eigenvalue problem under a perturbed state is *** eigenvalue problem is then solved by the spectral ***,the critical Rayleigh number with the corresponding wavenumber is evaluated at the assigned values of the other flow-governing *** results show that increasing the darcy number,the Lewis number,the dufour parameter,or the Soret parameter increases the stability of the system,whereas increasing the inclination angle of the channel destabilizes the ***,the flow is the most unstable when the channel is vertically oriented.

关键词： nanofluid inclined channel variable viscosity linear stability double dif-fusion porous medium

维普期刊数据库