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Is Thermoelectric Conversion Efficiency of a Composite Bounded by its Constituents?

Submitted by jiangyuli on
research
thermoelectric composite

We analyze the conversion efficiency of thermoelectric composites, and conclude that thermoelectric figure of merit ZT as we know it is ill-defined for composites, and is irrelevant for their conversion efficiency. In addition, we prove that thermoelectric conversion efficiency of a composite is not bounded by its constituents, and can be higher than all its constituents in the absence of size and interface effects, in contrast to previous claim.

Symmetry-Adapted Phonon Analysis of Nanotubes

Submitted by Amin Aghaei on
research
Nanotubes
phonon
Objective structures
Stability of Crystals
Dispersion Curves

This is the draft of our recent paper on the phonon analysis of nanotubes which is accpeted for publication by JMPS. The title and abstract are:

Title: Symmetry-Adapted Phonon Analysis of Nanotubes

Amin Aghaei, Kaushik Dayal (Civil and Environmental Engineering, Carnegie Mellon University)

Ryan Elliott (Aerospace Engineering and Mechanics, University of Minnesota)

 

Abstract:

A Post-Doctoral position at the Hebrew University- mechanics of landslide triggering.

Submitted by einatah on
research
landslides.

A postdoctoral research position is available at the Earth Sciences Institute, at the Hebrew University, Jerusalem, Israel, focusing on understanding basic processes of submarine landslide triggering, with applications to the Eastern Mediterranean Sea, offshore Israel. The work will involve numerical and/or physical modeling, analyzing the mechanisms of submarine slope-failure. Applicants should send their CV and intention letter including names of 3 referees, directly to the PIs: Prof.

Highly stretchable and tough hydrogels

Submitted by Jeong-Yun Sun on
research
suo group research
vlassak_group_research
hydrogels
SAMs Lab research
Mooney_group research

Tribology for Sustainability: Economic, Environmental, and Quality of Life - Special Issue freely available online!

Submitted by Laure Ballu on
research
Sustainability
Tribology International
Leeds-Lyon
Economic
Environmental

Tribology International Special Issue of the 37th Leeds-Lyon Symposium on Tribology: Tribology for Sustainability: Economic, Environmental, and Quality of Life.

For more information or to access this Special Issue, go to: http://www.journals.elsevier.com/tribology-international/

Comparing the effects of dispersed STW defects & double vacancies on the thermal conductivity of graphene nanoribbons

Submitted by Jingjie Yeo on
research
molecular dynamics
graphene
large scale molecular dynamics
graphene nano-ribbon
graphene sheet
Molecular Dynamics (MD)
molecular dynamics simulation
Reverse non-equilibrium molecular dynamics
Thermal conductivity
Stone-Thrower-Wales defects

http://iopscience.iop.org/0957-4484/23/38/385702/

 

LSDYNA UMAT- history variable choice

Submitted by hariharan on
research

Hi,

I'm presently working on implementing anisotropic yield criteria in LSDYNA as UMAT.

I understand from the LSDYNA documents that effective plastic strain is a default history variable.  So when we code, can we omit the update of effective plastic strain as a history variable? If so, where is it stored and how is it retrieved during post-processing ?

LSDYNA UMAT- history variable choice

Submitted by hariharan on
research
Plasticity
UMAT
LSDYNA

Hi,

I'm presently working on implementing anisotropic yield criteria in LSDYNA as UMAT.

I understand from the LSDYNA documents that effective plastic strain is a default history variable.  So when we code, can we omit the update of effective plastic strain as a history variable? If so, where is it stored and how is it retrieved during post-processing ?

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