Materials Literature
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With a specific pore-filling process, a solvent-annealing process, graphite-like nanotubes can be fabricated from poly(acrylonitrile) (PAN) pore-filling anodic aluminum oxide templates. The molecular orientation of anisotropic PAN chains was induced by solvent annealing due to capillary filling so as to achieve approp…
The present paper reports the investigation of the microstructure distribution of squeeze cast AZ91D alloy. The microstructure of squeeze cast AZ91D alloy is not uniform and is composed of four zones, which are chilled layer, segregation zone, pressured crystallisation area and hot spot area respectively. Moreover, in…
PURPOSE: To compare signal-enhancing properties of the high relaxivity Gd chelates P1152 and Gd-BOPTA for contrast-enhanced MR angiography (CE-MRA) in rabbits at 1.5 Tesla (T) and 3.0T. MATERIALS AND METHODS: Three-dimensional CE-MRA of the abdominal vasculature was performed in six rabbits using both contrast agents…
The described encapsulated thermoelectric (TE) module consists of a vacuum-tight stainless-steel container with dimensions of 55 mm × 50 mm × 11 mm in which a SiGe or BiTe TE module is placed. This construction enables maximum performance and durability because: (1) the thermal expansion mismatch between the hot and c…
Ab initio calculations have been carried out to unravel the relationships between the structure and the first hyperpolarizability in flavylium derivatives, with the aim to design efficient second-order nonlinear optical (NLO) switching compounds. Large contrasts of the first hyperpolarizability have been obtained alon…
The photoexcited charge-transferred state of [AuCl(PPh(3))(2)] in a novel polymorphic crystal form was directly observed by X-ray photocrystallographic analysis. Its photoexcited state was completely different from the one generated in the known crystal of [AuCl(PPh(3))(2)]; the photoexcited bond-shrunk state was gene…
OBJECTIVE: The purpose of our study was to determine the efficacy of using the Choyke questionnaire to stratify the potential risk for nephrogenic systemic fibrosis (NSF) before a gadolinium-enhanced MRI examination and to compare the economic impact of such an approach with universal blood sampling before gadolinium-…
The thermoelectric systems have attracted renewed interest as concerns with the efficient use of energy resources, and the minimization of environmental damage, have become important current issues. There has been he recognition that thermoelectric devices could play a role in generating electricity from waste heat, e…
ABSTRACT Most studies on the characterisation of deposits on heat exchangers have been based on bulk analysis, neglecting the fine structural features and the compositional profiles of layered deposits. Attempts have been made to fully characterise a fouled stainless steel tube obtained from a quintuple Roberts evapor…
This work aimed to obtain information on the water dispersibility of a 1:1 stoichiometric polyelectrolyte nanogel complex (SPENC). We synthesized a cationic polyelectrolyte nanogel (CPENG) composed of a cross-linked copolymer of 1-vinylimidazole and N-isopropylacrylamide. SPENC was then prepared at 25 degrees C from t…
Catalytic wet-air oxidation of p -cresol was carried out on Ag/Al 2 O 3 −ZrO 2 catalysts at 1, 5, 10, and 20 wt % of ZrO 2 in a reactor-type batch and 160 °C and 15 bar of oxygen. Al 2 O 3 −ZrO 2 supports were prepared by the simultaneous hydrolysis of the boehmite and zirconium alkoxide. Ag/Al 2 O 3 −ZrO 2 catalysts…
A stochastic technique based on genetic algorithms was implemented to develop new force fields by optimizing molecular mechanics (MM) parameters. These force fields have been optimized for inorganic compounds such as polyoxometalates (POMs) and especially for type-I polymolybdate and polytungstate clusters. Focussing…
Phase-change memory devices fabricated using MOCVD-deposited 30% Ge, 20% Sb, and 50% Te atomic composition, GST325 alloy, are fully characterized. In 100-nm-size test devices, a more than 2x reduction of reset current and set resistance were demonstrated compared with equivalent devices using PVD-deposited GST225. The…
AlN, a substance usually used as a heat-resisting material due to its high-temperature stability and high thermal conductivity, was applied in partial oxidation of methane for modifying γ-Al 2 O 3 support. γ-Al 2 O 3 -AlN, prepared by mechanically mixing γ-Al 2 O 3 and AlN, was used as support of a Ni-based catalyst.…
Calcareous deposits were formed on steel under cathodic protection conditions in artificial sea water at various potentials from −0·900 to −1·400 V(SCE). The deposition calcareous layers were characterised by electrochemical impedance spectroscopies, scanning electron microscopy observations and X-ray diffraction anal…
The accessibility of metal(II) complexes in 2D hexagonal mesostructured porous silicas obtained by direct synthesis is controlled using an appropriate organosilane ligand. This is exemplified here using copper(II) as a transition metal probe and a neutral or negatively charged ligand: N-(2-aminoethyl)-3-aminopropyltri…
This paper provides a review of co-generation process in fuel cell type reactor to produce valuable chemical compounds along with electricity. The chemicals and energy co-generation processes have been shown to be a promising alternative to conventional reactors and conventional fuel cells with pure water as a byprodu…
Magnetische Suszeptibilitätsmessungen bestätigen, dass die stöchiometrische Reduktion des MIL-47(V)-Gerüsts (grüne VO6-Oktaeder) mit dem metallorganischen Reduktionsmittel Cobaltocen zu einer gemischtvalenten Verbindung mit einem V3+/V4+-Verhältnis von 1:1 führt. Die einlagerten Cobaltocenium-Ionen (hellblau) lassen s…
Using reflectance and excitation spectroscopy, host-to-Eu 3+ energy transfer efficiencies in YBO 3:Gd,Eu under vacuum ultraviolet excitation have been calculated, at various concentrations of both dopants. As the Gd 3+ concentration is increased, an increase in the transfer efficiency to Eu 3+ is observed, consistent…
PURPOSE: The evaluation of the diagnostic capability of easy to measure x-ray scattering profile characterization parameters for the detection of breast cancer in excised samples. The selected parameters are the full width at half maximum (FWHM) and area under the x-ray scattering profile of breast tissue in addition…