检索结果-南通市图书馆

Lattice dynamical and thermodynamical properties of ReB_2,RuB_2,and OsB_2 compounds in the ReB_2 structure

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第10期21卷 355-361页

作者： e.Deligoz K.Colakoglu Y.O.ciftci Department of Physics Aksaray University68100AksarayTurkey Department of Physics Gazi UniversityTeknikokullar06500AnkaraTurkey

Structural and lattice dynamical properties of ReB2,RuB2,and OsB2 in the ReB2 structure are studied in the framework of density functional theory within the generalized gradient *** present results show that these compounds are dynamically stable for the considered *** temperature-dependent behaviors of thermodynamical properties such as internal energy,free energy,entropy,and heat capacity are also *** obtained results are in good agreement with the available experimental and theoretical data.

关键词： ab initio calculations lattice dynamical properties thermodynamical properties diborides

Mechanical behavior and deformation mechanism of shape memory bulk metallic glass composites synthesized by powder metallurgy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第19期114卷 42-54页

作者： Tianbing He Tiwen Lu Daniel Sopu Xiaoliang Han Haizhou Lu Kornelius Nielsch Jürgen eckert Nevaf ciftci Volker Uhlenwinkel Konrad Kosiba Sergio Scudino Leibniz IFW Dresden Institute for Complex MaterialsHelmholtzstraße 2001069 DresdenGermany Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of TechnologyGuangzhou 510640China erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Leibniz IFW Dresden Institute for Metallic MaterialsHelmholtzstraße 2001069 DresdenGermany TU Dresden Institute of Materials Science01062 DresdenGermany TU Dresden Institute of Applied Physics01062 DresdenGermany Department Materials Physics Montanuniversität LeobenJahnstraße 12A-8700 LeobenAustria Leibniz Institute for Materials engineering IWT 28359 BremenGermany University of Bremen Faculty of Production Engineering28359 BremenGermany

The synthesis of martensitic or shape-memory bulk metallic glass composites(BMGCs)via solidification of the glass-forming melts requires the meticulous selection of the chemical composition and the proper choice of the processing parameters in order to ensure that the glassy matrix coexists with the desired amount of austenitic ***,a relatively limited number of such systems,where austenite and glassy matrix coexist over a wide range of compositions,is ***,we study the effective-ness of powder metallurgy as an alternative to solidification for the synthesis of shape memory ***_(48)Cu_(36)Al_(8)Ag_(8)matrix composites with different volume fractions of Ni_(50.6)Ti_(49.4)are fabricated using hot pressing and their microstructure,mechanical properties and deformation mechanism are investigated employing experiments and *** results demonstrate that shape-memory BMGCs with tun-able microstructures and properties can be synthesized by hot *** phase stability of the glass and austenitic components across a wide range of compositions allows us to examine fundamental as-pects in the field of shape memory BMGCs,including the effect of the confining stress on the martensitic transformation exerted by the glassy matrix,the contribution of each phase to the plasticity and the mechanism responsible for shear band *** present method gives a virtually infinite choice among the possible combinations of glassy matrices and shape memory phases,expanding the range of accessible shape memory BMGCs to systems where the glassy and austenitic phases do not form simul-taneously using the solidification route.

关键词： Metallic glass composites Niti alloys Mechanical properties Shear bands Martensitic transformation

Processing soft ferromagnetic metallic glasses:on novel cooling strategies in gas atomization,hydrogen enhancement,and consolidation

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第24期59卷 26-36页

作者： N.ciftci N.Yodoshi S.Armstrong L.Madler V.Uhlenwinkel Leibniz Institute for Materials engineering IWT Badgasteiner Straße 328359BremenGermany Cooperative Research and Development Center for Advanced Materials Institute for Materials ResearchTohoku University2-2-1 KatahiraAoba-kuSendai980-8577Japan University of Bremen Faculty of Production EngineeringBadgasteiner Straße 128359BremenGermany

Processing soft ferromagnetic glass-forming alloys through gas atomization and consolidation is the most effective technique to produce bulk *** commercial viability of these materials depends on commercial purity ***,crystallization in commercial purity feedstock is several orders of magnitude faster than in high purity *** production of amorphous powders with commercial purity requires high cooling rates,which can only be achieved by extending the common process window in conventional gas *** development of novel cooling strategies during molten metal gas atomization on two model alloys({(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 and Fe76B10Si9P5)is *** inducement during liquid quenching significantly improved the glass-forming ability and soft magnetic properties of{(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 *** plasma sintering experiments verified that amorphous rings could be produced regardless of the cooling strategies *** the saturation magnetization was almost unaffected by consolidation,the coercivity increased slightly and permeability decreased *** magnetic properties of the final bulk samples were independent of feedstock *** developed cooling strategies provide a great opportunity for the commercialization of soft ferromagnetic glass-forming alloys with commercial purity.

关键词： Gas atomization Amorphous powders Metallic glass Cooling Quenching Heat transfer Hydrogen

evaluating visual outcomes using optical coherence tomography(OCT)in pediatric multiple sclerosis and other neuroinflammatory conditions

在线全文

学校读者我要写书评

暂无评论

Annals of eye Science 2020年第2期5卷 57-68页

作者： Beyza ciftci-Kavaklioglu e.Ann Yeh Department of Pediatrics(Neurology) SickKids Research InstituteDivision of Neurosciences and Mental HealthHospital for Sick ChildrenUniversity of TorontoTorontoCanada

Optical coherence tomography(OCT)is a technology that is widely used to assess structural abnormalities in the retina for a variety of pediatric *** introduction of this instrument has allowed for widespread access to minimally invasive standardized,reproducible quantified structural assessments of the optic nerve and *** has had important implications in pediatric optic neuropathies,populations in whom monitoring of disease activity is essential to make treatment *** has had particular relevance for inflammatory optic neuropathies,as onset of an inflammatory optic neuropathy may herald the onset of a chronic inflammatory disorder of the central nervous system(CNS)such as multiple sclerosis,neuromyelitis optica spectrum disorder(aquaporin 4 antibody positive),and myelin oligodendrocyte glycoprotein(MOG)associated *** paper will focus on the application of OCT technology to this group of disorders in *** reviewing pediatric-specific anatomic and practical issues pertinent to OCT,we will review knowledge related to the use of OCT in inflammatory pediatric optic neuropathies,with a focus on structural outcomes and their correlation with functional outcome metrics.

关键词： Multiple sclerosis(MS) pediatric demyelination visual outcomes optical coherence tomography(OCT)

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

婴儿罕见贯穿伤1例:直别针从背部移行至胃

世界核心医学期刊文摘（儿科学分册） 2006年第12期2卷 60-60页

作者： Yalin ■. Karnak I. ciftci A.O. ■enocak M.e. 刘凯 Department of Pediatric Surgery Hacettepe University Faculty of Medicine06100 AnkaraTurkey

Sharp foreign bodies reach into the abdomen frequently by ingestion and may lead to various complications including *** 11-month-old infant is presented for straight-pinmigration into the abdomen with penetration from the back and through the left diaphragm,spleen,and stomach. The infant was treated successfully with a well-organized diagnostic and therapeutic algorithm.

关键词：左侧膈肌

在线全文

学校读者我要写书评

暂无评论

与双侧肾脏畸形有关的瓦尔敦堡综合征

世界核心医学期刊文摘（儿科学分册） 2005年第11期1卷 58-58页

作者： ekinci S. ciftci A.O. Senocak M.e. Büyükpam-ukuN. 李丹 Department of Pediatric Surgery Hacettepe University Medical Faculty 06100 Ankara Turkey

A 1-year-old girl with Waardenburg syndrome type I presented with double collecting system of left kidney accompanied by nonobstructive hydronephrosis of lower pole and by ureteropelvic junction obstruction of right kidney. Renal involvement in Waardenburg syndrome was reported once in a 4-month-old boy with unilateral duplication of the renal collecting system and in a 16-day-old girl who had right multicystic dysplastic kidney and hydronephrosis in the left kidney. The third case of renal involvement in Waardenburg syndrome is presented here, with special emphasis on early diagnosis and management of renal anomaly. The authors conclude that urinary system anomalies should also be considered in the wide spectrum of Waardenburg syndrome clinical features to avoid life-threatening complications.

关键词：双侧肾脏瓦尔肾盂积水单侧肾肾脏受累集合系统肾盂输尿管左侧肾脏性发育右侧肾脏