Materials Literature
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By a theoretical model consisting of Su-Schrieffer-Heeger Hamiltonian and a Hubbard term, the ground-state and soliton excitation of an organic ferromagnetic polymer $m$-polydiphenylcarbene are investigated. As the electron-phonon coupling $\ensuremath{\lambda}$ increases, there is a structure phase transition from a…
Abstract Commercial chitosans were subjected to controlled acid hydrolysis and their degrees of deacetylation (DD), molecular size and rheological flow profiles determined (pre‐ and post‐hydrolysis) by 1 H‐NMR spectroscopy, high‐performance size‐exclusion chromatography and rheometry, respectively. Hydrolysis resulted…
Protein nanocrystallography has recently been introduced as a unique nanotechnology-based approach to forming stable protein crystals and to characterize them down to atomic resolution. In particular, a protein nanostuctured template appears to be capable of stimulating nucleation and crystal growth of so far unsolved…
Pressure is a non-invasive physical parameter that can be used to control and influence protein crystallization. It is also found that protein crystals of superior quality can be produced in gel. Here, a novel crystallization strategy combining hydrostatic pressure and agarose gel is described. Comparative experiments…
Abstract The effects of ultrasonic irradiation on the rheology, structure, and properties of PP/inorganic filler composites were studied. Scanning electron microscopy showed that ultrasound increased the orientation degrees of acicular fillers to the flow direction. WAXD indicated that ultrasound vibration induced she…
Selective absorption of isoprene from n -pentane mixtures was performed via reversible π complexation with an aqueous solution of copper(I) nitrate, which was prepared by the disproportionation reaction between copper powder and cupric nitrate trihydrate [Cu(NO 3 ) 2 ·3H 2 O] in H 2 O in the presence of pyridine and n…
Knowledge of protein crystal perfection in theory and practice is reviewed. X-ray methods of assessing perfection such as mosaicity, topography and reciprocal-space mapping are described. X-ray diffraction physics applications of protein crystals such as in Laue geometry, the large-angle oscillation technique and form…
The present report is dedicated to a systematic comparison of crystal structures produced by the nanobiofilm template method and by the classical hanging-drop vapour-diffusion method. Crystals grown by the innovative nanostructured template method appear indeed radiation-resistant even in the presence of a third-gener…
A dynamic seeding method that is different from the conventional method of seeding drops that have been equilibrated is described. The method basically consists of two steps. Firstly, microseeding was used in association with adjustment of the seeding-drop components, including buffer, additive and concentrations of t…
We investigate the electron transport in multiply connected metallic carbon nanotubes within the Landauer-B\"uttiker formalism. Quasibound states coupled to the incident ${\ensuremath{\pi}}^{*}$ states give rise to energy levels of different widths depending on the coupling strength. In particular, donorlike states or…
This paper concerns the development of an innovative LiCrO 2 catalyst (synthesis, characterization, mechanistic analysis, and aging). This catalyst already showed appreciable activity at 300 °C toward the catalytic combustion of soot even under loose contact conditions. Furthermore, its limited sensitivity to hydrothe…
Ceria (CeO 2 )‐doped alumina (Al 2 O 3 ) composite nano‐particles were synthesized using sucrose as a chelating agent and template material. As‐synthesized powders were characterized using X‐ray diffraction technique for their phase analysis, BET surface area analyzer for specific average surface area, and transmissio…
Abstract A new class of blend membranes from blends of nitrile rubber (NBR) and epoxidized natural rubber (ENR) has been prepared and their morphology, miscibility, mechanical, and viscoelastic properties have been studied. The ebonite method was used to study the blend morphology of the membranes. The morphology of t…
Since the 1980s hundreds of macromolecular crystal growth experiments have been performed in the reduced acceleration environment of an orbiting spacecraft. Significant enhancements in structural knowledge have resulted from X-ray diffraction of the crystals grown. Similarly, many samples have shown no improvement or…
Atomic diffusion in pure $\ensuremath{\alpha}$-Fe and Fe-l at. % Cu crystals via vacancies is investigated by molecular-dynamics computer simulation. In order to generate a large statistical set, modeling is performed for the temperature range of 1000--1800 K. The migration energy and preexponential factors in diffusi…
Three-phonon interactions are identified and analyzed in nonequilibrium molecular dynamics simulations of the Lennard-Jones face-centered cubic crystal. The small simulation cells studied and the classical nature of the simulations lead to a different description of the phonon transport than the quantum-particle model…
The phase transformation of mechanically milled nano‐sized γ‐alumina particles was investigated. The structures and phase presentation of the powders before and after milling were characterized using X‐ray diffraction, transmission electron microscopy, and photoluminescence measurement. The phase transformation kineti…
Of the proteins encoded by the three structural genes of the lac operon, the galactoside acetyltransferase (thiogalactoside transacetylase, LacA, GAT) encoded by lacA is the only protein whose biological role remains in doubt. Here, we briefly note the classical literature that led to the identification and initial ch…
The Q factors of different elemental structures of metamaterials are investigated. Electromagnetic simulation and experiments have been used and the results from both studies exhibit good agreement. The origin and role of radiation losses is discussed and the effect on the resulting value of Q is highlighted. Some hig…
We introduce a family of models for heat conduction with and without momentum conservation. They are analytically solvable in the high temperature limit and can also be efficiently simulated. In all cases the Fourier law is verified in one dimension.