Materials Literature
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Les mammiferes qui ont une existence strictement souterraine rencontrent des problemes physiologiques tres differents de ceux qui vivent sur le sol. L'habitat souterrain met effectivement a l'abri des stress d'un climat extreme et de la predation, mais il constitue aussi un environnement sombre et peu ventile. L'adopt…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFerroelectric Liquid Crystals for Nonlinear Optics: Orientation of the Disperse Red 1 Chromophore along the Ferroelectric Liquid Crystal Polar Axis†David M. Walba, Daniel J. Dyer, Teresa Sierra, Peter L. Cobben, Renfan Shao, and Noel A. ClarkView Author Information Dep…
The synthesis of the AB 2 mesogenic group 13-hydroxy-1-(4-hydroxyphenyl)-2-(4-hydroxy-4‘-biphenylyl)tridecane (TPT‘-OH, 11 ) and its use in the preparation of 1,12,33,44-tetraoxa-25-[(methacryloyloxy)undecanyl]-57-ethyl[12.0.2.12.0.2]paracyclophane ( 17 ), 1,12,33,44,65,76-hexaoxa-25-[(methacryoyloxy)undecanyl]-57,89-…
Key dimensions were selected for women's ready-to-wear garments to generate an anthropometric size-labeling system designating garment size with body measurements. Two different statistical analyses were used to select key dimensions: residual variance analysis and factor analysis. The results of the study show that (…
We recently proposed a new method allowing the controlled synthesis of ring-shaped polymers with predictable molar masses and narrow molar mass distribution. The cyclization is based on a unimolecular “end-to-end” coupling reaction of an heterodifunctional linear polymer precursor. In this paper, this methodology is a…
This paper describes a new separation process of liquid−liquid extraction. It consists of first mixing the system to be extracted with a primary solvent, which is soluble with the native solvent, and subsequently adding a modifier, which is insoluble with either the native or the primary solvent. This process is simil…
The effect of moisture on the heat transmission through fourteen protective clothing assemblies has been analysed. The samples have been prepared in three different ways to simulate the accumulation of humidity either in the outer shell or in the inner layers. The behaviour of breathable water barriers has been invest…
High chromium white irons are ferrous based alloys containing 11–30 wt-% chromium and 1.8–3.6 wt-% carbon, with molybdenum, manganese, copper, and nickel sometimes added as additional alloying elements. The microstructure of these alloys typically consists of hard primary and/or eutectic carbides in a matrix of austen…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHexagonal Columns of Poly(n-alkyl propiolate) Produced with Rhodium Complex Catalyst. X-ray Analysis and Oxygen PermeabilityM. Tabata, Y. Sadahiro, Y. Nozaki, Y. Inaba, and K. YokotaView Author Information Department of Molecular Chemistry, Graduate School of Engineering, Hokka…
The local structure around Mo atoms in Mo−Mg binary oxides has been investigated by X-ray absorption spectroscopy at Mo and Mg K edges. XANES and EXAFS spectra show that the binary oxides have a tetrahedral MoO 4 unit in the samples with a Mo/(Mo + Mg) ratio of less than 0.5 and an octahedral MoO 6 unit in the samples…
Composite membranes composed of commercial anion exchange membranes and polypyrrole were prepared by chemical oxidation of pyrrole in the membrane matrix. Two different procedures were used: immersing the anion-exchange membranes equilibrated with a ferric chloride solution into an aqueous pyrrole solution; immersing…
A non commercial θ–θ energy dispersive X-ray diffractometer equipped with a solid state detector has been used for the determination of the amorphous structures of nine mixed hydroxycarbonates containing Co, Cu, Zn and Al. Energy dispersive X-ray diffraction (EDXD) provides information about the local order around the…
Di-μ-chlorobis(η 3 -2-methylallylplatinum) reacts with imines HL n = p- C n H 2 n +1 O−C 6 H 4 −CH N−C 6 H 4 −OC n H 2 n +1 - p ( n = 6, 1a; n = 2, 1b ) to yield the C,N-cyclometalated platinum(II) compounds [Pt 2 (μ-Cl) 2 (L n ) 2 ] ( 2a, 2b ). From 2, other types of dinuclear complexes [Pt 2 (μ-X) 2 (L n ) 2 ] with…
The present paper discusses the dynamics of recombination processes in PbI 2 nanocrystals embedded in porous silica films. The photoluminescence (PL) spectrum of the samples consists of three bands: an exciton band near 2.5 eV and two deeper bands centered at 2.44 eV (L band) and 2.03 eV (G band). The L band relates t…
We investigated the effect of second-harmonic superimposition (SHS) on the oxidation of iodide ions induced by ultrasound with two frequency components: 1.03 and 2.06 MHz. With SHS, the oxidation rate reached a maximum when the acoustic intensity ratio of the fundamental to the second harmonic was about 1:1, while con…
Carbothermic reduction of boric acid has scientific and economic advantages over other methods of boron carbide production. The strongly endothermic reaction which has a favourable free energy change only at high temperatures is best carried out in a specially designed graphite resistance furnace at temperatures above…
The X-ray photoelectron spectra of eight polymers [(CH 2 CH 2 ) n, (CH 2 CH 2 NH) n, (CH 2 O) n, (CH 2 CH 2 S) n, (CH 2 CHX) n, and (CH 2 CX 2 ) n (X = F, Cl)] were analyzed by the deMon density-functional method using the model oligomers. Calculated AIK α valence photoelectron spectra were obtained using Gaussian lin…
The addition of a solution of 6 mmol of NaNO2 to an aqueous solution containing 3 mmol of Ni(NO3)2·6H2O and 3 mmol of OHpn produces the brown complex [Ni7(μ-NO2)8(μ2-OH)2(μ3-OH)2(OHpn)2(Opn)2]2·7H2O (OHpn is the 1,3-diamino-2-propanol), which is characterized by X-ray crystallography and magnetic susceptibility measur…
The formation of mullite was investigated using microcomposite powders which consist of α‐alumina cores and amorphous silica coatings. Differential thermal analysis and X‐ray diffraction showed that the mullitization reaction was endothermic. In contrast, mullite forms exothermically in samples prepared by sol‐gel pro…
The aim of this paper was to study the evolution of furosine, pyroglutamic acid, and uridine and rheological characteristics of albumen from shell eggs stored over long times at 30, 20, and 5 °C. The chemical variables showed an increase in function of the storage temperature with more evident variations at room tempe…