Materials Literature
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The present work indicates through thermodynamic considerations that YLiO 2 additive is beneficial for low‐temperature sintering of AlN ceramics. Pressureless sintering of commercially available AIN powders with simultaneous additions of YLiO 2 and CaO resulted in materials with high thermal conductivity (170 W·m –1 ·…
The main objective of this paper is to report on a newly developed three phase TCR model for SVC which is based on the use of harmonic switching vectors and discrete convolutions. This model is amenable to direct frequency domain operations and provided a fast and reliable means for assessing 6- and l2-pulse TCR plant…
In order to improve wettability of polycarbonate to triple distilled water, an Ar+ ion and an oxygen ion were irradiated on a polycarbonate (PC) surface under various oxygen flow rates. Doses of ions were changed from 5×1014 to 5×1016 ion/cm2 in a range from 500 eV to 1.5 keV energy by a broad ion beam source. Wetting…
Aqueous solutions of Al 3+ and Fe 3+ nitrates were pyrolyzed to produce (Al,Fe) 2 O 3 amorphous solid solutions with up to 50 mol% Fe 2 O 3 . Following subsequent heat treatments, all compositions first crystallized to γ‐(Al,Fe) 2 O 3 and those with ≥20% Fe 2 O 3 ultimately partitioned into a mixture of A1 2 O 3 and F…
The Fermi pencil-beam approximation describes the broadening of a monoenergetic, nearly monodirectional particle beam in an optically thick system in which the mean scattering angle is small and large-angle scattering is negligible. This physical problem has applications in such diverse fields as astrophysics, materia…
The corrosion films on iron in aqueous carbonate/bicarbonate solutions were studied as a function of concentration, pH, and temperature by using the technique of surface‐enhanced Raman spectroscopy with electrodeposited silver. Both and were detected in the surface oxide film at prepassivation potentials. Iron carbona…
A phenoxynaphthacenequinone forms a densely packed monolayer together with 1-tetradecanethiol on a gold electrode. The assembly can be reversibly switched to enable amperometric transduction of an optical signal. In the diagram on the right the current is switched off by irradiation with UV light.
Abstract The polymer systems are discussed in the framework of the Landau‐Ginzburg model. The model is derived from the mesoscopic Edwards Hamiltonian via the conditional partition function. We discuss flexible, semiflexible and rigid polymers. The following systems are studied: polymer blends, flexible diblock and mu…
Partial substitution of ammonium polyphosphate (APP) by manganese dioxide (MnO2) in polyamide 6 (PA-6) fire retarded with 20% of APP strongly increases the fire retardant effect. ‘Linear pyrolysis’ experiments, which are modified cone calorimeter tests, show an increase in the amount and an improvement of the shieldin…
Infrared spectroscopy has been coupled with the polarization modulation technique in order to characterize the molecular orientation in films of azopolymers irradiated in situ with polarized visible light. The results obtained on disperse red 1-containing amorphous azopolymer (pDR1A) demonstrate the high efficiency of…
The ion contamination in twisted nematic liquid crystals should be limited to assure good electro-optical performance of AM-LCDs. Today, pure liquid crystal mixtures are produced, though little information is available on long term stability, and on the kind of ions that contaminate the liquid crystal. The first step…
Recent advances in the theory of characteristic X-ray emission from crystals under dynamic electron diffraction conditions are used in developing a new fully quantitative statistical method for atom location by channelling-enhanced microanalysis (ALCHEMI). Limitations imposed by delocalization, disorder and occupancy…
Ultrathin \ensuremath{\gamma}-Fe/Cu(001) films are unstable with respect to the fcc\ensuremath{\rightarrow}bcc phase transition with the reported onset of transformation as early as at 5 ML. Here we demonstrate that with the help of a collaborative surfactant effect of carbon and oxygen, \ensuremath{\gamma}-Fe films u…
The skin replacements presently used for wound coverage vascularize less well than do autologous split-thickness skin grafts. Understanding how autologous grafts vascularize can lead to methods to improve skin-replacement vascularization. Fresh human skin was grafted on athymic mice. Endothelial cells were stained by…
We present molecular dynamics simulations on ubiquitin with explicit solvent molecules and investigate the influence of different force fields [Weiner et al. (J. Am. Chem. Soc. 106:765-784, 1984; J. Comput. Chem. 7:230-252, 1986) vs. Cornell et al. (J. Am. Chem. Soc. 117:5179-5197, 1995)], different treatments of the…
To determine the molecular orientation of rubbed and unrubbed poly[4,4′-oxydiphenylene- pyromellitimide] (PMDA-ODA) films, we have measured the infrared (IR) absorption spectra of PMDA-ODA films on Si substrates as a function of the incident angle. The molecular orientation was determined by fitting the incident angle…
The superconducting transition temperatures $({T}_{c})$ and N\'eel temperatures $({T}_{N})$ have been determined for thirty $({R}_{1\ensuremath{-}x}{R}_{x}^{\ensuremath{'}}){\mathrm{Ni}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ single crystals. For ${T}_{c}>{T}_{N}$, deviations from de Gennes scaling occur that are probably…
Relaxor ferroelectric single crystals of Pb(Zn 1/3 Nb 2/3 )O 3 –PbTiO 3 (PZN-PT) are of interest as high performance transducers due to their very large piezoelectric coupling and dielectric properties. A high temperature flux solution method was used to grow (1- x )PZN-( x )PT, where x = 0.0, 0.1 and 0.15 single crys…
Partial substitution of ammonium polyphosphate (APP) by manganese dioxide (MnO2) in polyamide 6 (PA-6) fire retarded with 20% of APP strongly increases the fire retardant effect. ‘Linear pyrolysis’ experiments, which are modified cone calorimeter tests, show an increase in the amount and an improvement of the shieldin…
Phototransferred thermoluminescence (PTTL) can be utilised for various dosimetric applications, e.g. high dose dosimetry, dose re-evaluation, and ultraviolet (UV) and laser radiation dosimetry. Different parameters of PTTL in CaSO4:Dy using laser and UV radiation have been studied and are reported. CaSO4Dy is an extre…