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Membrane interactions control residues fluctuations of outer membrane porins

Submitted by Azim B Besya on
research

Bacterial outer membrane porins (Omp) that have robust ß-barrel structures, show potential ap-

plications for nanomedicine devices in synthetic membranes and single molecule detection biosensors.

Here, we explore the conformational dynamics of a set of 22 outer membrane porins, classified into

five major groups: general porins, specific porins, transport Omps, poreless Omps and composed

pores. Normal mode analysis, based on mechanical vibration theory and elastic network model, is

What is stress? Who has ever seen stress? Is stress a physical quantity?

Submitted by Yi-Heng Chen on
research
stress
strain
configurational forces
displacement
invariant integral
pseudo physical quantity

What is stress? Who has ever seen stress? Is stress a physical quantity?

Professor Yi-Heng Chen, Xi’an Jiaotong University, 710049, P.R.China

e-mail: yhchen2 [at] mail.xjtu.edu.cn (yhchen2[at]mail[dot]xjtu[dot]edu[dot]cn)

 

In fact, this question has been bothering the present author for more than 15 years.

Simulation ENF Specimen with Fibre Metal Laminates in ABAQUS

Submitted by DaniBa on
research

Hello everybody,i am trying to analyze a Fibre Metal Laminate ENF specimen for crack porpagation with ABAQUS. Therefore i am using the VCCT method. The model is running, but not with the expected outcome. The problem is that there is no crack propagation, as Mode II energy release rate is Zero. I really don't know why. I am using the "composite layup" function with continuum sheels and SC8R reduced integration continuum shell elements. To get an ENF specimen iam stacking this layup and model a frictionless contact between.

New perspective on Couple Stress theory resolving the indeterminacy issue

Submitted by Ali_Hadjesfandiari on
research
nanomechanics
Couple Stress tensor
Curvature tensor
Polar Continuum Mechanics

Dear fellow Mechanicians,We have done this research on couple stress theory which we believe has resolved the problem of indeterminacy in the spherical part of the couple-stress tensor and the appearance of the body couple in the constitutive relation for the force-stress tensor  (Mindlin and Tiersten, 1962).I humbly request you to read the paper and give me your feedback. I believe you would agree this is an important issue in Continuum Mechanics which can open up new frontiers.Sincerely,

Ali Reza Hadjesfandiari 

Registration Mimics Innovation Awards 2011 is open

Submitted by Mimics on
research
Mimics
CAE
Implant
Materialise
Innovation Awards
MIA
competition
poster

The registration of the 2011 edition of our famous Mimics Innovation Awards is open. So, if you have an interesting research project in which Mimics is used, then you can submit this now! Of course, we reward the winners again with 17,500 Euro in total.

You can participate in 4 categories:

Journal Club September 2010: Modeling the Mechanics of Cellular Membranes

Submitted by Alexander A. Spector on
research
adhesion
bending
tension
viscoelasticity
electromechanical coupling
biological cell

Constitutive relations, 2-D vs. 3-D. The starting point for modeling cellular membranes is the constitutive relations in 2-D space. It is important to set up the corresponding equations directly in two dimensions rather than to consider them as an asymptotic limit of three-dimensional relationships, like it is done in the shell theory. The main reason for the direct 2-D relations is that 3-D continuum approaches are not applicable to membranes whose thickness in on the order of magnitude of the dimension of a single molecule.

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