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Search results for: Nimal Rajapakse

Items from 1 to 15 out of 15 results

article

Oxidation studies on mustard gas, and the first crystal structure of a metal-mustard gas complex

Nimal Rajapakse, Shahram Mehraban, Andrew Pacheco, Brian O. Patrick, more

Inorganica Chimica Acta > 2018 > 482 > C > 62-66

Attempts to selectively oxidize mustard gas [(ClCH₂CH₂)₂S, abbreviated as BCES] to the non-toxic sulfoxide using a trans-Ru(TMP)(O)₂/O₂ catalyst (TMP = porphyrin dianion of 5,10,15,20-tetramesitylporphyrin) have led to isolation and characterization, including an X-ray structure, of trans-Ru(TMP)(BCES)₂, the first such report of a metal-mustard gas complex.

chapter

Support Reactions

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 115-148

In this chapter, the most common kinds of supports of simple structures and the different connecting elements f multi-part structures are introduced. We will discuss their characteristic features and how they can be classified, so that the students will be able to decide whether or not a structure is statically and kinematically determinate. Students will also learn from this chapter how the forces...

chapter

Introduction

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 1-3

Mechanics is the oldest and the most highly developed branch of physics. As important foundation of engineering, its relevance continues to increase as its range of application grows. The tasks of mechanics include the description and determination of the motion of bodies, as well as the investigation of the forces associated with the motion. Technical examples of such motions are the rolling wheel...

chapter

Static and Kinetic Friction

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 255-278

Bodies in contact exert a force on each other. In the case of ideally smooth surfaces, this force acts perpendicularly to the contact plane. If the surfaces are rough, however, there may also be a tangential force component. Students will learn that this tangential component is a reaction force if the bodies adhere, and an active force if the bodies slip. After studying this chapter, students should...

chapter

Beams, Frames, Arches

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 169-216

Beams are among the most important elements in structural engineering. In this chapter, it is explained how the internal forces in a beam can be made accessible to calculation. The normal force, the shear force and the bending moment are introduced. Students will learn how to determine these quantities with the aid of the conditions of equilibrium. In addition, they will learn how to correctly apply...

chapter

Forces with a Common Point of Application

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 19-48

In this chapter, systems of concentrated forces that have a common point of application are investigated. Such forces are called concurrent forces. Note that forces always act on a body; there are no forces without action on a body. In the case of a rigid body, the forces acting on it do not have to have the same point of application; it is sufficient that their lines of action intersect at a common...

chapter

Basic Concepts

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 5-18

Statics is the study of forces acting on bodies that are in equilibrium. To investigate statics problems, it is necessary to be familiar with some basic terms, formulas, and work principles. Of particular importance are the “method of sections”, the “law of action and reaction”, and the “free-body diagram”, as they are used to solve nearly all problems in statics. The concept of force can...

chapter

Trusses

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 149-168

A truss is a structure composed of slender members that are connected at their ends by joints. The truss is one of the most important structures in engineering applications. After studying this chapter, students should be able to recognise if a given truss is statically and kinematically determinate. In addition, they will become familiar with methods to determine the internal forces in a statically...

chapter

Center of Gravity, Center of Mass, Centroids

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 87-114

In this chapter, definitions of the center of gravity and the center of mass are given. It is shown how to determine the centroids of bodies, areas and lines. Various examples demonstrate how to apply the definitions to practical problems.

chapter

General Systems of Forces, Equilibrium of a Rigid Body

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 49-86

In this chapter general systems of forces are considered, i.e., forces whose lines of action do not intersect at a point. For the analysis, the notion “moment” has to be introduced. Students should learn how coplanar or spatial systems of forces can be reduced and under which conditions they are in equilibrium. They should also learn how to apply the method of sections to obtain a free-body diagram...

chapter

Work and Potential Energy

Dietmar Gross, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, more

Engineering Mechanics 1 > 217-254

Students will become familiar with the concepts of work, conservative forces and potential energy. In addition, they will learn about the principle of virtual work. After studying this chapter, students should be able to correctly apply this principle in order to determine equilibrium states in nonrigid systems as well as support reactions and internal forces and moments. Finally, it will be shown...

book

Engineering Mechanics 1

Nimal Rajapakse, Dietmar Gross, Werner Hauger, Jörg Schröder, more

article

Mechanical properties of catalyst coated membranes for fuel cells

Marc-Antoni Goulet, Ramin M.H. Khorasany, Chris De Torres, Mike Lauritzen, more

Journal of Power Sources > 2013 > 234 > Complete > 38-47

The change in mechanical properties of a catalyst coated membrane (CCM) as a function of humidity and temperature is investigated and compared to that of a pure perfluorosulfonic acid (PFSA) membrane at the same conditions. The results of tensile tests indicate that the modulus and yield stress of the CCM vary differently than those of the membrane with respect to temperature and humidity. Both materials...

article

Nonlocal Continuum Modeling and Molecular Dynamics Simulation of Torsional Vibration of Carbon Nanotubes

Farzad Khademolhosseini, A. Srikantha Phani, Alireza Nojeh, Nimal Rajapakse

IEEE Transactions on Nanotechnology > 2012 > 11 > 1 > 34 - 43

This paper investigates the size effects in the dynamic torsional response of single-walled carbon nanotubes (SWCNTs) by developing a modified nonlocal continuum shell model. The purpose is to facilitate the design of devices based on CNT torsion by providing a simple, accurate, and efficient continuum model that can predict the frequency of torsional vibrations and the propagation speed of torsional...

article

Modeling and identification of tool holder–spindle interface dynamics

Mehdi Namazi, Yusuf Altintas, Taro Abe, Nimal Rajapakse

International Journal of Machine Tools and Manufacture > 2007 > 47 > 9 > 1333-1341

The majority of the chatter vibrations in high-speed milling originate due to flexible connections at the tool holder–spindle, and tool–tool holder interfaces. This article presents modeling of contact stiffness and damping at the tool holder and spindle interface. The holder–spindle taper contact is modeled by uniformly distributed translational and rotational springs. The springs are identified...

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© 2015 Interdisciplinary Centre for Mathematical and Computational Modelling

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