A new director-based finite element formulation for geometrically exact beams is proposed by weak enforcement of the orthonormality constraints directors. In addition to an improved numerical performance, this enables development two more beam theories adding further constraints. Thus, paper presents a complete intrinsic spatial nonlinear theory three kinematically different which can undergo l...

a nonlocal beam model based on the bernoulli–euler beam theory is presented to investigate the dynamic stability of embedded single-walled carbon nanotubes (swcnts) in thermal environment under combined static and periodic axial loads. the dynamic stability analysis is carried out by including the effects of small-scale parameter, temperature change and elastic medium. the equation of motion is...

This paper articulates some fundamental requirements of science and engineering widely observed in traditional engineering disciplines and argues that we need to adopt in SE research a similar methodological rigor. SE community needs to define rigorously technical concepts, formulate research hypotheses, test theories, and reexamine conflicting theories closely to maintain our theory consistent...

Abstract. The dynamic stability problem is solved for onedimensional structures subjected to time-dependent deterministic or stochastic axial forces. The stability analysis of structures under time-dependent forces strongly depends on dissipation energy. The simplest model of viscous damping with constant coefficient was commonly assumed in previous papers despite the fact that there are other ...

Many engineering ethics classes and textbooks introduce theories such as utilitarianism and Kantianism (and most others draw from these theories without mentioning them explicitly). Yet using ethical theories to teach engineering ethics is not devoid of difficulty. First, their status is unclear (should one pick a single theory or use them all? does it make a difference?) Also, textbooks genera...

In this article, the bending and free vibration analysis of functionally graded (FG) nanocomposites Timoshenko beam model reinforced by single-walled boron nitride nanotube (SWBNNT) using micro-mechanical approach embedded in an elastic medium is studied. The modified coupled stress (MCST) and nonlocal elasticity theories are developed to take into account the size-dependent effect. The mechani...

The goal of this keynote paper is to argue for a unifying theoretical foundation for software engineering. I believe that one of the reasons for our lack of rigor compared to physical and behavioral sciences is that we have not given enough attention to the theories that underpin our work, both as software engineers and as software engineering researchers. I present my general theory about soft...

The close analogy between geometrical optics and the classical theories of charged-particle beam optics have been known for a very long time. In recent years, quantum theories of charged-particle beam optics have been presented with the very expected feature of wavelengthdependent effects. With the current development of non-traditional prescriptions of Helmholtz and Maxwell optics respectively...

Introduction and organization The use of synchrotron based high-energy x-ray scattering in materials/engineering programs is relatively new to both the synchrotron and engineering communities in the United States. In Europe such efforts are more advanced with engineering beam lines existent or under construction at ESRF in France, at PETRA III in Germany, and at Diamond in England. The industri...