Materials Literature
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Fundamental control of the polymerization behaviour of polymer‐dispersed liquid crystals (PDLCs) is critical to the formation of high‐performance devices by polymer‐induced phase separation (PIPS). Previous PDLC research has shown that monomer functionality and additives such as surfactants or reactive diluents can im…
In situ identification of the films formed on alloys of Fe-13Cr-10Ni, Fe-5Cr-10Ni, and Type 304 (UNS S30400) stainless steel immersed in high-temperature (288°C), high-purity water was performed using Raman spectroscopy, surface-enhanced Raman spectroscopy, and scanning electron microscopy. The films were a function o…
The paper deals with some important aspects of steady state thermal stability in the insulation of HVDC cables. The resistively graded electric field distribution and the temperature distribution, under steady state, in dc cables, are interrelated. The dc conductivity is known to be a function of stress as well as of…
This research is concerned with the analysis of leakage current, LC, of a porcelain standard station insulator during a glaze ice accretion. The results obtained show that the leakage current during ice accumulation goes through two distinct periods characterized by specific LC waveforms and frequency harmonics. Labor…
Pyruvate phosphate dikinase (PPDK) catalyzes the reversible conversion of phosphoenolpyruvate (PEP), AMP, and Pi to pyruvate and ATP. The enzyme contains two remotely located reaction centers: the nucleotide partial reaction takes place at the N-terminal domain, and the PEP/pyruvate partial reaction takes place at the…
The features of structural transformations occurring at ultrahigh plastic strains, which are proposed to refer to as gigascopic, have been analyzed. It is shown that, during such deformation, additional channels of elastic energy dissipation must be effectively implemented. It is concluded that structural changes are…
Hydrogen penetration into thin films of vanadium dioxide from aqueous solutions of mono-, di-, and tribasic alcohols is studied. It is shown that this process is reversible, has a catalytic character, and brings about a lowering of the metal-semiconductor phase transition temperature. It is established that the phase…
We present exact analytical and numerical results for the electronic spectra and the Friedel oscillations around a substitutional impurity atom in a graphene lattice. A chemical dopant in graphene introduces changes in the on-site potential as well as in the hopping amplitude. We employ a T-matrix formalism and find t…
This paper investigates the effect of K(1.94)Zn(1.06)Ta(5.19)O(15) (KZT) addition on the sintering behavior and piezoelectric properties in lead free piezoelectric ceramics of (K(0.5)Na(0.5))NbO(3) (KNN). The apparent density of sintered KNN ceramics was increased with KZT addition, and a relative density of above 96.…
In this paper, we demonstrated a novel technique to promote crystallization of hen egg-white lysozyme in heavy water. The technique was essentially based on aggregation of the protein molecules by photon pressure generated under irradiation of a cw 1064 nm laser beam to the protein solution. When photon pressure was k…
The dispersion behaviour and electromagnetic interference (EMI) shielding properties were investigated for metal nanoparticle- and carbon nanostructure-filled polymer composites. It was observed that carbon nanostructure–polymer composites exhibited a much higher shielding performance than Ag nanoparticle–polymer comp…
This paper presents a laboratory investigation into the development of a low-pH magnesium phosphate-based cement for use in in-situ stabilisation/solidification systems, as a more effective alternative to Portland cement. The idea is to develop a cement-based binder with a low enough pH to facilitate biodegradation in…
In order to respond to soaring public concern about environmental protection, various biodegradable polymers have been developed. The present paper reports the electrical conduction and breakdown properties of various biodegradable polymers such as poly-L-lactic acid (PLLA), polyethylene terephthalate succinate (PETS)…
As a part of a comprehensive research work on ZnO-TiO2 nanosystems synthesized by Chemical Vapor Deposition (CVD), we initially devoted our attention to the preparation and characterization of nanocrystalline TiO2 thin films. Specifically, the coatings were obtained by CVD on Si(100) substrates starting from Ti(OiPr)2…
High Resolution Image Download MS PowerPoint Slide The selective oxidation of crotyl alcohol has been explored over a Pd(111) model catalyst. At low temperatures, the alcohol adsorbs intact with the C C bond parallel to the surface. Activation likely proceeds through an allyl alkoxide intermediate that follows two dis…
The most common complication associated with immobilization is pressure sores caused by sustained localized tissue strain and stress. Computational simulations have provided insight into tissue stress-strain distribution, subject to loading conditions. In the simulation process, adequate soft tissue material parameter…
We report here the use of plasmonic metal nanostructures in the form of silver island films (SiFs) to enhance the fluorescence emission of five different phycobiliproteins. Our findings clearly show that the phycobiliproteins display up to a 9-fold increase in fluorescence emission intensity, with a maximum 7-fold dec…
The evolution of fundamental concepts concerning the mechanisms of plastic deformation in solid polymers, crystals (both glassy and semicrystalline) over the recent five decades has been reviewed. The most effective approach to the description of cold plastic deformation is a gradual drift away from the chain straight…
Abstract Semi-crystalline polymers can be drawn up to very high draw ratios that involve a complete molecular rearrangement of the chain-folded lamellar morphology into a more or less chain-unfolded fibrillar microstructure. This metamorphosis is likely to take place through an intermediate state of high molecular dis…
Metallic sandwich panels with prismatic cores offer the potential for superior blast resistance relative to monolithic plates of equivalent areal density.However, under sufficiently high impulse, severe plastic strains can occur at the junctions of the face sheets and the core members shortly after arrival of the pres…