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INTERNAL FRICTION OF 51CrV4 SHAFT INFLUENCED BY THERMO-MECHANICAL COUPLINg

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Acta Metallurgica Sinica(English Letters) 2008年第2期21卷 79-84页

作者： j.gken M.Maikranz-Valentin K.Steinhoff T.S.Pavlova T.V.Ivleva I.S.golovin Chair of Metal Forming Technology University of Kassel KasselGermany Physics of Metals and Materials Science Department Tula State University TulaRussia

The simultaneous influence of thermal and mechanical treatment was applied to produce a geometrically complex shaft from 51CrV4 steel leading to the formation of mierostruetures which were significantly different from each other. These mierostrue- rural differences were accompanied by a local change of mechanical properties in terms of hardness, electrical resistivity and especially internal friction. The Snoek-KSster peak was recognized and analyzed in the structure of this steel.

关键词： 51CRV4 steel Functionally graded material (FgM) Internalfriction Snoek- KSster peak

应用波束形成法研究51CrV4梯度功能钢的微观结构

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冶金分析 2009年第4期29卷 7-13页

作者： j.gken M.Maikranz-Valentin j.Timmerberg S.Luker D.Fuβ j.Feierabend K.Steinhoff Institute of Maritime Studies University of Applied Sciences Chair of Metal Forming Technology University of Kassel Department of Electrical Engineering University of Applied Sciences Agency of Computer-generated Imagery gfai Tech gmbH

对组分梯度功能范围的调整要求已提出,通常通过不同材料组合得以解决。但是这种生产方式一方面需要一系列的工序,另一方面也需要具体的知识,包括所用材料的独特物理及机械特性,尤其是它们的形变及热行为。因此,为了降低能耗,考虑到生态... 详细信息

对组分梯度功能范围的调整要求已提出,通常通过不同材料组合得以解决。但是这种生产方式一方面需要一系列的工序,另一方面也需要具体的知识,包括所用材料的独特物理及机械特性,尤其是它们的形变及热行为。因此,为了降低能耗,考虑到生态需求,一个组分的现代工业设计程序只应包括一种操作程序和一种具有优化性能的范围大的材料。同时对同质的工件初样进行热处理及机械处理保证了控制材料能够具有最终元件性能的梯度功能。第一步,研究不同热处理对CrV-合金热处理矩形条钢(51CrV4)微观结构演化的影响。生产出只具有铁素体-珠光体、铁素体-珠光体-贝氏体和马氏体结构的条钢。与振动的振幅衰减相关的时间由声学照相机测定。这种声学照相机可以产生彩码声音图谱,显示覆盖于已记录样品图像上噪音的强度和来源。基于作为常规信号处理方法的波束形成概念,该声音分析用来控制换能器阵列上信号的接收或传播方向。条钢的独特微观结构状况造成了振动特性的显著变化。

关键词：钢梯度功能内耗波束形成法

On the Set of grouplikes of a Coring

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Acta Mathematica Sinica,English Series 2012年第1期28卷 195-204页

作者： L.EL KAOUTIT j.góMEZ-TORRECILLAS Departamento de lgebra.Facultad de Educación y Humanidades Universidad de GranadaEl Greco No 10E-51002 CeutaEspaa Departamento de lgebra.Facultad de Ciencias Universidad de GranadaE18071 GranadaEspaa

We focus our attention to the set gr（ξ） of grouplike elements of a coring ξover a ring A. We do some observations on the actions of the groups U（A） and Aut（ξ~） of units of A and of automorphisms of corings of ξ, respectively, on gr（ξ）, and on the subset gal（ξ）of all galois grouplike elements. Among them, we give conditions on ξ under which gal（ξ） is a group, in such a way that there is an exact sequence of groups {1} → U（Ag） → U（A） → gal（ξ） → {1}, where Ag is the subalgebra of coinvaxiants for some g ∈ gal（ξ）.

关键词： galois corings division ring extensions non-abelian cohomology

Acoustic Measurements for Determination of the Materials Damping Using A Sound Source Localisation System

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Acta Metallurgica Sinica(English Letters) 2013年第2期26卷 113-121页

作者： j. gken j. Swiostek H. Hurdelbrink U. Keil Faculty of Maritime Studies University of Applied Sciences Emden/Leer Bergmannstr. 36 26789 LeerGermany Stalomax TM Company of High-Precision Mechanics ul. Parkingowa 45 37450 Stalowa WolaPoland

Noise measurements are especially a problem when the object under investigation is largely dimensioned and can only be measured from the distance. To obtain information about the location of noise generation, a measurement technique which makes sound visible in order to introduce further specific technical measures is advantageous. The question is if the time dependence of the signal got from such a non touching and non destructive acoustic method has the potential to calculate the materials damping from. Using a small sound source localization system （Microflown^TM probe）, specimens of magnesium alloys with different grain sizes obtained by hydrostatic extrusion were investigated. It has been demonstrated that the fine grained microstructure led to a lower damping and its dependence on the strain was reduced. In this context, acoustic measurements by a sound source localisation system which makes materials characterization possible could be used as a quality tool to detect changes in highly stressed components. This approach allows to promote a selective substitution of conventional materials by more innovative ones. The offshore sector is considered to be a field of application： Wind turbines produce noise emission which stems mainly from turbulences at the tips of the rotor blades and vibrations of components inside the nacelle （e.9. gearbox, generator, ...）. If the vibration amplitudes are too high, microcracks of components can lead to failure over the long term. The monitoring of microstructural changes using a larger type of a sound source localisation system is considered as an innovative technical approach with respect to maintenance activities.

关键词： Magnesium Noise measurements MicroflownTM Damping

INVESTIgATION ON 1/3[111] FRANK LEDgE DISLOCATIONS ATα_2/γINTERFACE IN HOT-DEFORMED Ti-45Al-10Nb ALLOY

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Acta Metallurgica Sinica(English Letters) 1997年第4期10卷 323-328页

作者： j.g Wang L.C Zhang g.L. Chenand HQ. Ye(State Key Laboratory for Advanced Metals and Materials, Unborsity of Science and Technology Beijing,Beijing 100083, China)(Laboratory of Atond Imaging of Solids, Institute of Metal Research, Chinese Academy of Scienc Univ of Science and Technology Beijing Beijing China

The dislocation ledges at the α2/7 intedece in a hot-dejormed Ti-45Al-10N alloywere analyzed by high-resolution tmnsmission electron microscopy. A new type ofdislocation ledge containing 1/3[111] Frank partial was found. The height of the ledgestDas always three [111]γplanes. The Burpers vectore of these diBlocation ledges weredetermined to be 1/2[110] and 1/2g to the 90 dey. and 30 *** partials at noral ledges, i.e. 90 dep. ShockIey Partial dislocation +1/3[111]Frank partial dislocation; and 30 deg. Shockley partial dislocation + 1/3[111] Frankparfial dislocations. The jormation mechanism of this new tare of dislocation ledgewas discussed.

关键词： titanium aluminide thermomechanical treatment phase interface tmnsmission electron microscopy

High Strength Low Alloy (HSLA) Steels in Building Construction

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journal of Iron and Steel Research International 2011年第S1期18卷 773-778页

作者： Sivakumaran ken Siva jansto Steven g Department of Civil Engineering McMaster UniversityHamilton Reference Metals Company-CBMM 1000 Old Pond RoadBridgevillePA 15017USA

Majority of the buildings,including industrial buildings,are constructed using either structural steel (plates and structural shapes) or deformed bar steel reinforced *** buildings,however,must be designed to be safe and serviceable during construction and during use and *** objectives can be easily achieved by the use of steels having superior mechanical properties,ductility,weldability,fire resistance,*** the years,the steel industry has made improvements in steel making technologies resulting in high strength low alloy (HSLA) steels with superior steel properties well suited for building *** part of this paper presents the structural design considerations,and the constructional considerations associated with the building structures in general,and steel structures in *** second part of the paper looks at the acceptance criteria for HSLA steels for North American building codes and *** third part of the paper presents the structural properties of currently available HSLA steels for building *** discussion focuses on hot-rolled structural steel shapes as well as deformed steel bars for concrete *** paper argues that Niobium microalloying is the key to achieving superior properties in such steels.

关键词： HSLA steels building construction structural shapes deformed bars structural performance niobium

Apples to oranges:environmentally derived,dynamic regulation of serotonin neuron subpopulations in adulthood?

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Neural Regeneration Research 2025年第9期20卷 2596-2597页

作者： Christopher j.O’Connell Matthew j.Robson Department of genetics College of MedicineHarvard UniversityBostonMAUSA james L.Winkle College of Pharmacy Division of Pharmaceutical SciencesUniversity of CincinnatiCincinnatiOHUSA Neuroscience graduate Program College of MedicineUniversity of CincinnatiCincinnatiOHUSA

Traumatic brain injury(TBI)is a public health problem with an undue economic burden that impacts nearly every age,ethnic,and gender group across the globe(Capizzi et al.,2020).TBIs are often sustained during a dynamic range of exposures to energetic environmental forces and as such outcomes are typically heterogeneous regarding severity and pathology(Capizzi et al.,2020).

关键词： sustained orange dynamic

Large eddy simulation of free-surface flows

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journal of Hydrodynamics 2017年第1期29卷 1-12页

作者： Richard j.McSherry ken V.Chua Thorsten Stoesser School of Engineering Cardiff UniversityCardiffCF24 3AAUK

This paper introduces and discusses numerical methods for flee-surface flow simulations and applies a large eddy simula- tion （LES） based flee-surface-resolved CFD method to a couple of flows of hydraulic engineering interest. The advantages, dis- advantages and limitations of the various methods are discussed. The review prioritises interface capturing methods over interface tracking methods, as these have shown themselves to be more generally applicable to viscous flows of practical engineering interest, particularly when complex and rapidly changing surface topologies are encountered. Then, a LES solver that employs the level set method to capture flee-surface deformation in 3-D flows is presented, as are results from two example calculations that concern com- plex low submergence turbulent flows over idealised roughness elements and bluff bodies. The results show that the method is capable of predicting very complex flows that are characterised by strong interactions between the bulk flow and the free-surface, and permits the identification of turbulent events and structures that would be very difficult to measure experimentally.

关键词： Large eddy simulation free-surface level set method volume of fluid

Helicity Amplitude Analysis of Z_c(3900)~± in e^+e^- →π^+π^-j/ψ

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Chinese Physics Letters 2016年第6期33卷 9-11页

作者：平荣刚 j.g.Messchendorp 苑长征 Institute of High Energy Physics Chinese Academy of Sciences KVI-CART University of Groningen

It is crucial to determine the spin and parity （jR） of Zc（3900）＋ for understanding its structure. We perform a helicity amplitude analysis on Zc（3900）＋ in the process e＋e- →π＋π-j/φ＊ with the hypotheses jP = 0-, 1＋, 1-, 2＋ and 2-. To estimate the significance of jP = 1＋ over other hypotheses, we perform a Monte Carlo simulation study, and we also discuss the prospect of measuring the spin parity in the future experiment with a large data sample.

关键词： of on is Helicity Amplitude Analysis of Z_c in e for that