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What would you choose as the Top 5 Equations? Top 10?

Equations are of central importance in all of science and engineering, but especially so in mechanics.

Even leaving aside algebraic equations, handbooks on PDEs alone list hundreds of equations. However, a few of these do stand out, either because they encapsulate some fundamental aspect of physics/science/engg., or because they serve as simpler prototypes for more complex situtations, or simply because they are so complex as to be fascinating by themselves. There might be other considerations too... But the fact is, some equations really do stand out as compared to others.

Jianliang Xiao's picture

SES 2011, Minisymposium on Mechanics of Adhesion

Adhesion has long been an important issue for mechanics and many other disciplines. Its influence spans macro-, micro-, nano- and molecular scales. When size goes down, adhesion plays a more and more significant role. Many important technologies attribute to adhesion, such as transfer printing for advanced microfabrication,  super adhesives inspired by gecko foot hairs, and self-assembly. Adhesion also has strong implications on the behavior of nanomaterials (such as nanotubes and graphenes) and biological system (such as cells).

Xuanhe Zhao's picture

Postdoctoral Position at Duke Soft Active Materials Laboratory

The Duke Soft Active Materials Laboratory directed by Prof Xuanhe Zhao is seeking a highly motivated postdoctoral fellow to study mechanics of polymers and hydrogels with applications in tissue regenerations. The work will be carried out in close collaboration with the Duke Orthopaedic Bioengineering Laboratory directed by Prof Farshid Guilak.

What do we do?

Yesterday, as I was waiting for the rain to stop before I could walk home from work, a stranger accosted me in the lobby of the building.  He asked me what I did, to which I replied "Mechanics".  He mulled over the answer for a bit and asked me to be more specific, at which point I said that we were trying to design materials that could guide waves around objects.  He said "Water waves?".  I replied "All types of waves."  Clearly, common words can mean quite different things to different people.

Ji Wang's picture

Faculty Positions at Department of Mechanics and Engineering Science, Ningbo University

The Department of Mechanics and Engineering Science, Ningbo University, China, has multiple openings in Solid Mechanics and Fluid Mechanics for experienced and junior applicants.

The Department has been supported by Zhejiang Province under Center for Excellence program for broad subjects related to Engineering Mechanics research and education.  We also have special funds for the enhancement of the Fluid Mechanics program.

More details on the current research and education program  of the Department can be found at http://mech.nbu.edu.cn.

 

Applicants and inquiries should be addressed to 

Markus J. Buehler's picture

Special issue on "Computational and Theoretical Materiomics" now published (J. Computational &Theoretical Nanoscience)

The special issue on "Computational and Theoretical Materiomics: Properties of Biological and de novo Bioinspired Materials" has now been published. A list of papers is included below. A sincere thank you to all contributors! Anyone interested in a reprint of any of the articles please send me a message.

Ji Wang's picture

Faculty Positions at Piezoelectric Device Laboratory, Ningbo University

The Piezoelectric Device Laboratory has immediate opennings for recent PhDs.  We are engaged in researchs in piezoeelctric acoustic wave resonators with supports from government and indsutry.  The Laboratory has been grwoing and we would like to have new members to accelerate the pace and expand collaborations with the fast growing piezoelectric acoustic wave device industry in China and other countries.

Use Only the Angular Quantities in Analysis? Three Sample Problems to Consider...

A recent discussion at iMechanica following my last post here [^] leads to this post. The context of that discussion is assumed here.

I present here three sample problems, thought of almost at random, just to see how the suggestions made by Jaydeep in the above post work out.

Are Linear and Angular Momenta Interconvertible?

To the best of my knowledge, the two momentum conservation principles, namely, the conservation of linear- and angular-momentum, operate completely independent of each other. For an isolated object, there is no possibility of conversion of one form of momentum to the other.

Jianliang Xiao's picture

Materials and Mechanics for Stretchable Electronics

A review paper on stretchable electronics written by Professors John A. Rogers, Takao Someya, and Yonggang Huang was published in a recent issue of Science . This paper gives a nice summary on the recent advances in inorganic and organic stretchable electronics. Materials, structures and mechanics of these systems are discussed. Many attractive applications of stretchable electronics are introduced, such as stretchable silicon circuit, electronic eyeball camera, and flexible LED display. 

Jianliang Xiao's picture

Mechanics of in-surface buckling of one dimensional nanomaterials on elastomeric substrates

In this recently published paper on Nanotechnology, we studied the in-surface buckling mechanics of one dimensional nanomaterials on elastomeric substrates.  Simple analytical solutions are obtained for buckling wavelength and amplitude, which can be easily applied to the in-surface buckling of different nanomaterials, such as nanowires and nanotubes.  It is shown that in-surface buckling of nanomaterials has lower energy than out-of-surface buckling, which explains the experimental observance of

An Urgent Appeal for Your Support of My Job Application at COEP's Mechanical Engineering Department

Dear iMechanicians,

I have applied for the job of "Associate Professor" in the Department of Mechanical Engineering at COEP, Pune, India [^]---the same place from where I did my PhD (Mech.) research.

I most earnestly make an appeal to you to provide me with an informal support for my job application by way of a brief email recommendation. My resume may be found here [^].

Jianliang Xiao's picture

In-surface Buckling of Silicon Nanowires on Elastomeric Substrates

Buckling of thin layers or aligned arrays of stiff materials on elastomeric substrates has many important applications, such as stretchable electronics, precision metrology and flexible optoelectronics.  These systems show one common phenomenon, the stiff thin layers buckle normal to the substrate surface (out-of-surface buckling).  By contrast, we recently reported for the first time that silicon nanowires (SiNWs) on elastomeric substrates buckle only within the substrate surface, i.e. in-surface buckling.

A couple of upcoming international conferences in India

(i) 3rd International Congress on Computational Mechanics and Simulation (ICCMS09) to be held this year at IIT Bombay, on December 1--5, 2009. Abstracts due by July 31, 2009:

http://www.civil.iitb.ac.in/help/114_iccms09/iccms09.html

(ii) 54th Congress of the Indian Society of Theoretical and Applied Mechanics (An International Meet), to be held this year at the Netaji Subhas Institute of Technology, New Delhi, during December 18--21, 2009. Abstracts due by September 30, 2009:

Sigma_rr

Taxonomy upgrade extras: 

A (really) small problem

Here's a quick one.

Refer to the accompanying figure.

Figure to accompany a really small problem

 

It shows a frictionless glass tube lying on a horizontal desktop. The tube is smoothly bent at a couple of places as shown in the figure.

Suppose that a small steel ball (say, one taken from a ball-bearing) enters the tube at the point A, with an initial velocity of v.

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