The Institute of High
Performance Computing (IHPC), a member of the Agency for Science,
Technology and Research (A*STAR) in Singapore, invites applications for
eight available positions for research scientists in the field of
theoretical and computational mechanics and materials science. These
positions are in conjunction with the A*STAR-sponsored Visiting
Depolarization field and misfit strain are two important factors that may greatly influence the properties of ferroelectric thin films. The effect of depolarization field on polarization states of single-domain ferroelectric thin films with nonequally biaxial in-plane misfit strains are studied in the present work by numerically solving three coupled Euler-Lagrange equations, which are derived from the minimization of total free energy.
We have recently reported the label-free detection of HCV (Hepatitis C Virus) helicase by using a resonating microcantilever whose surface is functionalized by RNA aptamers as receptor molecules. This work was accepted for publication at Biosensors & Bioelectronics.
We study the kinetics of phase transformations in solids using the peridynamic formulation of continuum mechanics. The peridynamic theory is a nonlocal formulation that does not involve spatial derivatives, and is a powerful tool to study defects such as cracks and interfaces.
This letter describes a method to analyze electromechanical stability of dielectric elastomer actuators.We write the free energy of an actuator using stretches and nominal electric displacement as generalized coordinates, and pre-stresses and voltage as control parameters.When the Hessian of the free-energy function ceases to be positive-definite, the actuator thins down drastically, often resulting in electrical breakdown.Our calculation shows that stability of the actuator is markedly enhanced by pre-stresses.
This is a stress modeling position in TI's research
organization Silicon Technology Development (SiTD). The opening is
immediate and the position is filling very fast. Minimum requirement:
MS degree in the following fields: Mechanical Engineering, Physics,
Materials Science or Engineering Mechanics. PhD degree is preferred.
Please email your resume to Jie-Hua (Jeff) Zhao at jhzhao@ti.com or
Darvin Edwards at rvin@ti.com. Call Jeff at 972-995-8851 for detail.
When an electric voltage is applied across the thickness of a thin layer of an dielectric elastomer, the layer reduces its thickness and expands its area. This electrically induced deformation can be rapid and large, and is potentially useful as soft actuators in diverse technologies. Recent experimental and theoretical studies have shown that, when the voltage exceeds some critical value, the homogenous deformation of the layer becomes unstable, and the layer deforms into a mixture of thin and thick regions.
Anecdotal evidence can often serve as a basis for an opinion on the state of science and engineering in the US and abroad. While that evidence is valuable, it is not necessarily representative of national treends. Fortunately, the US government has collected useful information relevant to education, research, and employment within the science and engineering communities and presented it in a series of annual reports.
This has reference to (only) the *last paragraph* in Prof. Harry Lewis' recent post, found at: node/1423#comment-2880.
The reason I write the present post is because I always seem to have had a view of inventing, learning, or teaching mathematics that is remarkably at odds with what Prof. Lewis' last paragraph *seems* to imply.
Postdoctoral positions are available in the Micro and Nano Mechanics group led by Prof. Wei Cai in the Mechanical Engineering Department at Stanford University. [Link]
You are cordially invited to submit an abstract to the symposium on “Emerging Methods To Understand Mechanical Behavior” at 2008 TMS annual meeting, New Orleans, LA, March 9-13, 2008.
In a piezoelectric material an applied uniform strain can induce an electric polarization (or vice-versa). Crystallographic considerations restrict this technologically important property to non-centrosymmetric systems. It can be shown both mathematically and physically, that a non-uniform strain can potentially break the inversion symmetry and induce polarization even in non-piezoelectric dielectrics.
I am aware of several recent papers related to computational issues in strain gradient and other higher order theories. Has anyone tried the software package FEMLAB for such theories ? It purports to solve user defined PDEs. We have only had limited experience with it and I am curious to find out if someone has tried it out.
Given below is a sequence that might properly address the question of what to teach in the first (and the only) UG couse on strength of materials or solid mechanics.
0. Note: It's a mistake to believe that the contents for such a course can be covered in a linear fashion. Apply the spiral theory of knowledge and revisit certain concepts again and again: e.g., the concepts of stress, strain, fields, BV problems, theoretical structure, etc.
I wish that this thought had come to me earlier, so that I could have posted it on April First. No, I'm unaware of such a program. Instead, Harvard faculty have just emerged from a multi-year review of curriculum, and reaffirmed the commitment to liberal education, after voting out a president not too long ago.
We are looking for several new permanent staffs, including software developers with solid background on mechanics and good programming skills. the detailed information about the posts can be found from
The Koiter-Sanders-Budiansky bending strain measure and a nonlinear generalization
We know from strength of materials that non-uniform stretching of fibers along the cross section of a beam produces bending moments. But does this situation necessarily correspond to a 'bending' deformation? For that matter, what do we exactly mean kinematically when we talk about a bending deformation?
Koiter's PhD thesis, dated 1945, gave the birth of post-buckling analysis, and quantified the notion of imperfection sensitivity. He wrote the thesis in Dutch. An excellent English translation is free online.
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