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美国急诊放射学协会多中心闭合性脾外伤研究：Ct和临床表现

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国际医学放射学杂志 2021年第3期44卷 358-358页

作者： j.t.lee E.Slade j.Uyeda S.D.Steenburg S.t.Chong R.tsai 俞翔

摘要随着影像技术显示脾血管损伤的进步,闭合性脾外伤(BSt)的治疗方案不断地发展。目的报道11家外伤中心对于BSt的治疗方案、脾血管损伤的发生率、临床影响以

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Generation of brain vascular heterogeneity:recent advances from the perspective of angiogenesis

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Neural Regeneration Research 2025年第7期20卷 2013-2014页

作者： Nathanael j.lee Ryota L.Matsuoka Department of Neurosciences Lerner Research InstituteCleveland ClinicClevelandOHUSA Department of Molecular Medicine Cleveland Clinic Lerner College of MedicineCase Western Reserve UniversityClevelandOHUSA

Heterogeneous proper t i es of vascular endothelial cells in the brain:the brain displays large energy dynamics and consumption,and this high level of metabolic demands is fulfilled by a continuous supply of glucose and oxygen through its vascular *** vasculature consists of highly divergent blood vessel branches,giving rise to a dense network of capillaries that supply blood to all cells across the *** elaborated vascular network is thought to develop via angiogenesis,a process in which new blood vessels grow from pre-existing *** capillaries exhibit organotypic features distinct from other tissues and are formed primarily by two major endothelial cell(EC)types:those that form the semi-permeable blood-brain barrier(BBB)and those that develop highly permeable pores known as fenestrae(Matsuoka et al.,2022).the structural and functional differences between BBB and fenestrated vascular ECs represent a fundamental feature of brain vasculature and form the foundation for both brain function and homeostasis.

关键词： angiogenesis homeostasis network

剪切波弹性成像诊断乳腺癌假阳性和假阴性结果的影响因素

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国际医学放射学杂志 2013年第6期 594-594页

作者： j.H.Yoon H.K.jung j.t.lee K.H.Ko 时代刘倩 Radiology Department Saint-Louis Hospital1 avenue Claude Vellefaux75010 Paris France

摘要目的研究利用剪切波弹性成像诊断乳腺癌出现假阳性及假阴性结果的影响因素。方法研究对象为2012年6月—12月期间199例女性乳腺癌病人[年龄21;8岁,平

关键词：乳腺超声剪切波肿块病理切片

经导管动脉栓塞治疗40例植入性胎盘伴有相关的产后出血

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国际医学放射学杂志 2013年第3期 290-290页

作者： S.M.Hwang G.S.jeon M.D.Kim S.H.Kim j.t.lee M.j.Choi 尹学青 Department of Radiology CHA Bundang Medical CenterCHA University

目的评价盆腔动脉栓塞术(PAE)治疗急性难治性植入性胎盘(PA)伴有相关的产后出血(PPH)的价值。方法对植入性胎盘产后出血行动脉栓塞的40例病人进行回顾性研究。回顾了分娩和盆腔动脉栓塞的治疗过程。通过电话方式随访髂动脉栓塞术后的效... 详细信息

目的评价盆腔动脉栓塞术(PAE)治疗急性难治性植入性胎盘(PA)伴有相关的产后出血(PPH)的价值。方法对植入性胎盘产后出血行动脉栓塞的40例病人进行回顾性研究。回顾了分娩和盆腔动脉栓塞的治疗过程。通过电话方式随访髂动脉栓塞术后的效果。结果所有病人栓塞术均成功(100%)。最初的临床治愈率为82.5%(33/40)。3例病人在栓塞术后未能成功止血,于栓塞术后24h内进行了子宫切除,3例病人进行了再次栓塞术(2例在栓塞术后2d行再次栓塞,1例在首次栓塞术后6h行再栓塞),病人出血最终得以控制。临床成功率为92.5%。有4例病人术后立即出现了并发症,例如骨盆疼痛、恶心、荨麻疹。有3例出现较轻的远期并发症,即短时期的停经。病人均未出现较严重的远期并发症。有35例栓塞术后恢复了正常月经,包括2例单纯妊娠。1例病人尽管栓塞术成功止血,但因出现弥漫性血管内出血及脑内出血而死亡。结论 PAE可以安全有效地治疗很多PA伴有相关的PPH,许多病人可以避免切除子宫。PAE很少有严重并发症。要点①PAE是治疗产后出血的一种重要治疗方法。②PAE治疗PA伴PPH可能是安全和有效的。③PAE治疗保留子宫功能,不影响月经。④PAE很少有严重的并发症。

关键词：产后出血经血管栓塞术植入性胎盘保留生育能力并发症

Microstructure and tensile properties of magnesium nanocomposites fabricated using magnesium chips and carbon black

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journal of Magnesium and Alloys 2020年第3期8卷 860-872页

作者： t.j.lee W.j.Kim Department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

In this study,carbon black(0,0.01,0.03 and 0.08 wt%)and AZ31(Mg-3Al-lZn)magnesium chips were used to fabricate carbon black-reinforced magnesium matrix composites with extrusion or a combination of extrusion and high-ratio differential speed *** hot pressing at 693 K and extrusion at 623 K with an extrusion ratio of 22,the magnesium chips coated with carbon black were soundly bonded into a bulk composite *** grain sizes of the extruded materials were similar with a size of 48.2-51.5|im despite the difference in the amount of carbon *** yield strength and ultimate tensile strength increased from 177 to 191 MPa and from 240 to 265 MPa,respectively,as a result of the addition of 0.01%carbon black;however,a further increase in the strength was marginal with additional carbon *** same trend was observed in the strain hardening *** tensile elongation increased by to the addition of 0.01%carbon black(from 15.8%to 17.4%)due to the increased work hardening effect,but decreased with additional carbon black due to its agglomeration and poor dispersion at higher *** high-ratio differential speed rolling(HRDSR)on the extruded materials and subsequent annealing,the AZ31 and AZ31 composites had a similar fine grain size of 16.3-17.9 *** annealed HRDSR composites showed the best mechanical properties at a higher content of carbon black(0.03%)compared to that(0.01%)for the extruded *** resulted from the enhanced dispersion effect of the carbon black due to the high shear flow induced during the HRDSR *** extruded composites exhibited the three distinct hardening stages(stage II,stage III and stage IV),while the annealed HRDSR composites mainly displayed the stage III *** addition of carbon black increased the strain hardening rate at all the strain hardening stages in both of the extruded and annealed HRDSR *** the initial hardening stage,the strain hardening rates of the extruded comp

关键词： Recycling Magnesium alloys chips Carbon black Nanocomposites Extrusion Differential speed rolling

Carbide Formation Process in Directionally Solidified MAR-M247 LC Superalloy

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journal of Materials Science & technology 1999年第1期15卷 48-52页

作者： Chen, jian Huang, Baiyun lee, j.H. Choe, S.j. lee, Y.t. Cent S Univ technol Powder Met Res Inst Changsha 410083 Peoples R China Changwon Natl Univ Dept Met & Mat Sci Changwon 641773 South Korea Korea Inst Machinery & Mat Changwon 641010 South Korea

Carbide nucleation, growth and trapping behavior in directionally solidified MAR-M247 LC alloy and the corresponding mechanism have been investigated. Carbide forming element enrichment controls the carbide nucleation and the carbide growth behavior. If the carbide forming element enrichment and the nucleation sites are suitable, carbide nucleation can occur both above and below the liquids temperature. Heterogeneous carbide nucleation is the preferred nucleation mechanism at low carbide forming element enrichment. Carbide growth occurs mainly at inter-secondary gamma dendrite arm area and lower part of the mushy zone. the carbides are subsequently trapped at these positions after growing to a certain size. Some carbides are only partially trapped by the solid-liquid interface and the carbide growth accelerates after being partially trapped. A critical growth rate exists between 2 multiplied by 10** minus **6 m/s and 5 multiplied by 10** minus **6 m/s. the carbide volume fraction decreases in the directionally solidified part at slow growth rate which is caused by the lack of suitable growth site and the low trapping ability of the solid-liquid interface. (Edited author abstract) 16 Refs.

关键词： Nickel alloys

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