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Nonlinear vibration of an elastically restrained tapered beam

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Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1925-1930页

作者： KARIMPOUR S. GANJI S.S. bARARI A. IbSEN l.b. DOMAIRRY G. Department of Civil and Mechanical Engineering Babol University of TechnologyP.O.Box 484BabolIran Young Researchers Club Science and Research BranchIslamic Azad UniversityTehranIran Department of Civil Engineering Aalborg UniversitySohng rdsholmsvej 57DK-9000 AalborgAalborgDenmark

This paper presents the analytical simulation of an elastically restrained tapered cantilever beam using the energy balance method(EbM) and the iteration perturbation method(IPM).To assess the accuracy of solutions,we compare the results with the harmonic balance method(HbM).The obtained results from EbM and IPM are in excellent agreement with HbM *** results show that both methods can be easily extended to other nonlinear oscillations and it can be predicted that both methods can be found widely applicable in engineering and physics.

关键词： energy balance method (EbM) iteration perturbation method (IPM) nonlinear oscillation

Effect of two-step cooling process on mechanical properties of TRIP steel with high performance

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Journal of Iron and Steel Research International 2018年第4期25卷 426-432页

作者： M.l. li H. Jiang Y.l. He l.b. Chen G.T. Zhang H. Wang X.G. lu l. li School of Materials Science and Engineering Shanghai University Shanghai 200072 China State Key l.b.ratory of Advanced Special Steel Shanghai University Shanghai 200072 China Pangang Group Research Institute Panzhihua 617000 Sichuan China

A novel two-step cooling experiment was established to simulate the slow cooling process of continuous annealing production line for transformation-induced plasticity （TRIP） steel. The microstructures and mechanical properties of TRIP steel soaked at 700℃ for different time were investigated by tensile test, scanning electron microscopy, X-ray diffraction, and thermodynamic and kinetic calculation. It is shown that the steel soaked for 15 s exhibits the optimal product of strength and elongation （PSE 〉 30,000 MPa%） due to the transformation of austenite to proeutectoid ferrite, which delays the bainite transformation and improves the stability of retained austenite. In addition, the mechanical properties of TRIP steel soaked over 30 s are much lower, resulting from the precipitation of cementite, which decreases the stability of retained austenite and weakens the TRIP effect.

关键词： Transformation induced plasticity steel Two-step cooling Microstructure Mechanical property

INFlUENCE OF PROCESSING ON SHAPE MEMORY EFFECT OF Fe-Mn-Si-Ni-C-RE SHAPE MEMORY AllOY

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Acta Metallurgica Sinica(English letters) 2003年第5期16卷 385-394页

作者： N.C. Si, Z.H. Jia and l.b. QiSchool of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China Sch. of Mat. Sci. and Eng. Jiangsu Univ. Zhenjiang 212013 China

Effect of carbon, compound RE, quenching temperature, pre-strain and recovery temperature on shape memory effect (SME) of Fe-Mn-Si-Ni-C-RE shape memory alloy was studied by bent measurement, thermal cycle training, SEM etc. It was shown that the grains of alloys addition with compound RE became finer and SME increased evidently. SME of the alloy was weakening gradually as carbon content increased under small strain (3%). but in the condition of large strain (more than 6%), SME of the alloy whose carbon content range from 0.1% to 0.12% showed small decreasing range, especially of alloy with the addition of compound RE. Results were also indicated that SME was improved by increasing quenching temperature (>1000℃). The amount of thermal induced martensite increased and the relative shape recovery ratio could be increased to more than 40% after 3-4 times thermal training. The relative shape recovery ratio decreased evidently depending on rising of pre-strain. Furthermore, because speed of martensite transition was extremely great under higher tempering temperature (more than 450℃, ε → γ transition completed in 10s meanwhile the relative shape recovery ratio of the alloy increased rapidly.

关键词： Fe-Mn-Si-Ni-C-RE shape memory alloy quenching temperature pre-strain recovery temperature shape memory effect

Use of regression trees to predict overweight trucks from historical weigh-in-motion data

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第6期7卷 843-859页

作者： Mariana bosso Kamilla l.Vasconcelos linda lee Ho liedi l.b.bernucci Department of Transportation Engineering University of Sao Paulo(USP)Sao PauloBrazil Department of Production Engineering University of Sao Paulo(USP)Sao PauloBrazil

The traffic of overloaded trucks is a critical problem in *** affects pavement performance life,reduces the service life of bridges,and has a negative impact on road safety,average speed and level of *** are several practices to prevent the truck overloading issue,i.e.,enforcement activities to verify the truck’s compliance with the legal weight *** paper investigates the development of a method that uses avail.b.e weigh-in-motion(WIM)data to identify overloaded truck weight and travel *** proposed approach is based on regression trees method,a simple and easily understandable analytic tool used to build prediction models from a large set of *** overall analysis of the overloaded truck regression tree model shows that the most important variable to classify and predict overloading is the truck *** the axle overloading,the most significant variable is the time of the day(most of the overloaded trucks travel at late night or early morning).The regression tree results can be used to optimize the efficiency of administration activities by planning truck enforcement operations based on the more critical ***,the results improve the knowledge about the load characteristics of trucks,which can lead to more effective pavement management systems and more assertive pavement structure designs.

关键词： Regression piecewise Overloaded trucks Travel patterns Axle loading RPART package Enforcement activities

USE EXPEDIENCY OF QUANTUM UNITS OF RADIANT ENERGY IN PlANTS lIGHT CUlTURE

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USE EXPEDIENCY OF QUANTUM UNITS OF RADIANT ENERGY IN PLANTS ...

Color atlas of turfgrass weeds : a guide to weed identification and control strategies 2nd ed

26th Session of the CIE

作者： Tikhomirov,A.A. Prikupets,l.b. Institute Of biophysics of Siberian branch of Russian Academy of Sciences Krasnoyarsk All-Russian Research lighting Engineering Institute Moscow

last years it became customary to use physical units to measure radiant energy when quantum quantity of irradiation falling on plants is *** analysis of many years’ experience of photosynthetic photon flux(PPF)units(μmol/ms)and power units(W/m)use in plants light culture is given in the *** and disadvantages of these units as applied to light culture are *** concept of PPF unit introduction supposes that every light quantum falling on a

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Generalized Supersymmetric Perturbation Theory

2008年

作者： l.b. (bert) McCarty ... [et al.]

来源：畅想之星图书光盘版（南... 评论

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Chinese Physics letters 2004年第12期21卷 2330-2333页

作者： b.Goenül DepartmentofEngineeringPhysics UniversityofGaziantep27310GaziantepTurkey

Using the basic ingredient of supersymmetry, a simple alternative approach is developed to perturbation theory in one-dimensional non-relativistic quantum mechanics. The formulae for the energy shifts and wavefunctions do not involve tedious calculations which appear in the avail.b.e perturbation theories. The model applicable in the same form to both the ground state and excited bound states, unlike the recently introduced supersymmetric perturbation technique which, together with other approaches based on logarithmic perturbation theory, are involved within the more general framework of the present formalism.

关键词： Perturbation techniques

Forced motion of an elastic filament through a narrow tube

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Acta Mechanica Sinica 2015年第6期31卷 789-790页

作者： l.b.Freund Department of Materials Science and Engineering University of Illinois at Urbana Champaign

A polymer filament consisting of many similar molecules linked in a one-dimensional array is very flexible. As a result, shapes with a relatively large curvature can be accommodated elastically. When loosely confined in a thermal environment, such a flexible strand may become tangled owing to its flexibility. When confined within a narrow ＂tube＂ over its full length, a flexible molecule may behave quite differently. Here, we consider the qualitative nature of deformation of an individual filament when confined within a tube. Commonly the tube is formed within the cluster by a large number of surrounding filaments of the same type.

关键词： Statistical mechanics. biofilament. Reptation Partition function

A Search on the Klein-Gordon Equation

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Chinese Physics letters 2006年第10期23卷 2640-2643页

作者： b.Gonül Department of Engineering Physics University of Gaziantep Gaziantep 27310 Turkey

The s-wave Klein-Gordon equation for the bound states is separated in two parts to see clearly the relativistic contributions to the solution in the non-relativistic limit. The reliability of the model is discussed wi... 详细信息

关键词： ARbITRARY DIMENSIONS POTENTIAlS COUlOMb SCAlAR VECTOR DIRAC