Materials Literature
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High pressure torsion was applied to produce a disk-shaped specimen of Cu60Zr30Ti10 composition. The dependence of the morphology, microstructure, and thermal behavior on the applied shear strain was monitored by scanning and transmission electron microscopies, synchrotron x-ray diffraction, and calorimetry. The disk…
We present a far-infrared transmission study on group-III nitride thin films. Cubic GaN and AlN layers and c-oriented wurtzite GaN, AlN, and AlxGa1−xN (x<0.3) layers were grown by molecular beam epitaxy on GaAs and Si(111) substrates, respectively. The Berreman effect allows us to observe simultaneously the transverse…
Land snails move via adhesive locomotion. Through muscular contraction and expansion of their foot, they transmit waves of shear stress through a thin layer of mucus onto a solid substrate. Since a free surface cannot support shear stress, adhesive locomotion is not a viable propulsion mechanism for water snails that…
Abstract Minerals isostructural with sapphirine-1A, sapphirine-2M, and surinamite are closely related chain silicates that pose nomenclature problems because of the large number of sites and potential constituents, including several (Be, B, As, Sb) that are rare or absent in other chain silicates. Our recommended nome…
Nanocolander: Sub-nanometer thin organic materials with uniform imprinted pores are formed by controlled polymerization within temporary self-assembled scaffolds. Pores are measured by a colored size-probe retention assay. A nanocapsule with no pores retains yellow, red, and blue probes and is colored brown; 0.8 nm po…
By combining molecular dynamics simulation with reaction pathway sampling, we have observed the nucleation of a three-dimensional dislocation loop from a sharp corner in silicon and investigated the shear stress dependence of the activation energy and saddle-point configuration. The nucleated shuffle-set half-loop con…
The main drawback of most cancer chemotherapy is its relatively low ability to target tumour cells versus normal cells. As a consequence, chemotherapy is usually connected with severe side effects due to the toxicity of traditional cytostatic agents towards normal tissues. A few years ago, the site-specific activation…
A hybrid numerical-analytical method for the characterization of the propagation of the transverse-electric surface waves along a high impedance surface (HIS) is presented. The HIS is obtained by a 2-D periodic repetition of a rectangular unit cell on a Cartesian grid. The unit cell consists of a microstrip line with…
Conducting polymers are new materials that can be used as low-voltage actuators and active flexure joints, scaling down to the microscale; however, many devices based on these actuators are limited because they can only operate when submerged in an electrolyte. Conducting polymer trilayer actuators are laminated struc…
This paper presents recent progress of in situ observation for the microstructure evolution during solidification. Nucleation and fragmentation of dendrite arms are important issues for controlling microstructure during solidification. However, there are few studies on in situ observation of nucleation and fragmentati…
To investigate mechanical properties of different crystal orientations in titanium alpha and beta phases, nanoindentation was performed on two samples; commercially pure titanium (predominantly α phase) and a 15V-3Cr-3Sn-3Al (beta) alloy. This allowed the Young's Modulus and the hardness to be measured for individual…
In the present paper a numerical model is developed to predict the exact electric current paths in the slag region of an Electro-Slag-Remelting (ESR) process. The model solves the momentum and energy equations. The solidification of the slag at the mould is modelled with an enthalpy-porosity approach. The magnitude of…
AIMS: The further development of diagnostic and therapeutic nanomedicines in research and their translation into clinical practice require appropriate characterization methods to ensure a reproducible quality and performance. However, many methods are insufficient for a detailed analysis of the particle size. The prim…
The topics of conversion and utilization of methane are important issues to tackle global warming. Several technologies including plasma-based process were proposed to improve the process involving the conversion and utilization of methane. The direct conversion of methane to methanol in the presence of energetic spec…
Determining the frequency content of a signal is a basic operation in signal and image processing. The S-transform provides both the true frequency and globally referenced phase measurements characteristic of the Fourier transform and also generates local spectra, as does the wavelet transform. Due to this combination…
Investigation of the performance of quantum dot infrared photodetectors (QDIPs) in comparison to other types of infrared photodetectors operated near room temperature is presented. The model is based on fundamental performance limitations enabling a direct comparison between different infrared material technologies. I…
The cationic polymerization of diglycidyl ether of bisphenol-A (DGEBA) using a latent cationic thermal initiator, ammonium antimony hexafluoride, and the effect of addition of cycloaliphatic epoxy resin on the polymerization were studied with DSC, TGA, and hardness measurement. It was found that the cationically polym…
Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008
Structural proteomics is one of the powerful research areas in the postgenomic era, elucidating structure-function relationships of uncharacterized gene products based on the 3D protein structure. It proposes biochemical and cellular functions of unannotated proteins and thereby identifies potential drug design and pr…
Many microelectromechanical system applications require large in-plane actuation forces, with stroke lengths ranging from submicrometer to tens of micrometers in distance. Piezo electric thin films are capable of generating very large actuation forces, but their motion is not easily directed into lateral displacement…