Materials Literature
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Sequential addition of 1,10-phenanthroline (phen) or 2,2′-bipyridine (bipy) followed by 3,5-di-tert-butyl-catechol (H2dtbc) to oxobis(pentane-2,4-dionato)vanadium(IV) yields [V(dtbc)2L](L = phen or bipy) which can be oxidised using Ag[SbF6] to give [V(dtbc)2L][SbF6]. The new compounds have been characterised by microa…
Dynamic analysis of air-jet filling insertion has been carried out both experimentally and theoretically for unsteady-state running conditions. In Part I of this series, analytical models for both loop- and drum-storage systems are developed to investigate the air-jet filling-insertion process. The flight of the yarn…
Basket handle porphyrins containing short p- or m-phenylenedimethylenedioxy chains covalently linked at the ortho position of phenyl groups of 5,10,15,20-tetraphenylporphyrin have been synthesised. Isomer I of the para derivative (H2LIa) and isomers II and III(H2LIIb and H2LIIIb) of the meta derivative have been chara…
Studies have been made on frequency-dependent electrical conduction in polycrystalline diamond films prepared by plasma-enhanced chemical vapor deposition (PECVD). It is found by ac conductivity measurements that the electrical conduction in annealed diamond films is attributed to frequency-independent band conduction…
Polydimethylsiloxane (PDMS) oil and crosslinked rubber react with hydroxylated surfaces, when heated at 250-300°C. PDMS is thus chemically bound to silicate glass sheets and to iron hydrous oxide particles. As a result, stable and adherent PDMS coatings may be obtained over glass, by heating silicone oil spread over g…
Hairiness is a parameter of interest to the textile technologist. The material and the machines used both influence the fuzziness of yarn. This paper reports the results of a preliminary investigation in which fuzziness is reduced by increasing the pressure of air around the point of twisting. The reduction in hairine…
Vibrational, NMR and dynamic NMR spectra, considered together with the results of theoretical studies, provide a complete and fairly accurate quantitative picture of the isomerism affecting the nitroenamines R2R3N–C(1)R1C(2)H–NO2(R1= H, Me). The compounds with primary or secondary amino groups (R2 and/or R3= H) exist…
When considering the analysis of chitin and chitosan it must be remembered that there is no definitive ‘standard’ material for either polymer. Thus in many instances analysis is carried out in order to characterise the material rather than to determine whether or not it conforms to a definite structure. In the case of…
A discussion is given of the possible orthogonal and Euclidean transformations which are crystallographic. Especially the symmetry operations are considered which are used for the description of quasi-periodic systems. Since the latter are obtained as intersections of periodic n -dimensional structures with the physic…
X-ray diffraction measurements of thin chiral smectic C (Sc∗) liquid crystals between solid plates coated with rubbed polymer film were performed under an electric field. A variety of local layer structures which depend upon the boundary conditions could be observed, including bookshelf and chevron, and some distorted…
Forage production in the Appalachian Region is limited by soil acidity and nutrient deficiencies including phosphorus. North Carolina phosphate rock (PR), a carbonate substituted fluorapatite, should be reactive in these soils and may be appropriate as a low cost P fertilizer. An experiment was conducted to evaluate t…
Melting experiments with plagioclases were performed in the systems Ab-An, Ab-An-H2O, Qz-Ab-An-H2O, and Qz-Or-Ab-An-H2O-CO2. The experimental products were analysed by electron microprobe, and the kinetics of the reactions were studied qualitatively.Melting of the plagioclase in the system Ab-An (P = 1 atm, T = 1420°C…
Author: Ruth, A. A. et al.; Genre: Journal Article; Issued: 1992; Keywords: ALKANES; VISCOSITY; DENSITY; GLASS-TRANSITION RANGE; TEMPERATURE DEPENDENCE<br/>; Title: Temperature-dependence of viscosity and density of glass-forming alkanes
The transition of insulin between its crystallographically defined states T and R is connected with considerable change even of backbone structure: the N-terminal B chain (residues B1-B8) refolds from extended conformation in T into helical in R, and vice versa. Although hitherto observed only in hexamers the transiti…
The reaction of N,N,N′-tris(trimethylsilyl)formamidine with SeCl2 affords 1,2,3,5-diselenadiazolium chloride, which can be reduced with triphenylantimony to the corresponding diselenadiazolyl radical [HCN2Se2]˙; the solid state structure and conductivity of the dimer [HCN2Se2]2 are reported.
We report measurements of osmotic compressibility in a quasibinary liquid mixture of 3-methylpyridine, water, and heavy water. The measurements probed the lower consolute point (${\mathit{T}}_{\mathit{L}}$) for samples of varying loop sizes (\ensuremath{\Delta}T). An exact doubling of the critical exponent (\ensuremat…
Diffusion coefficients of hydrogen in fully annealed specimens of pure iron, Fe-(0.46∼5.17 at%)Al, Fe-(0.53∼5.06 at%)Si, Fe-(0.47∼7.67 at%)V, Fe-(0.40∼5.10 at%)Cr, Fe-0.35 at%Mn, Fe-(0.41∼4.79 at%)Co, Fe-(0.98∼5.16 at%)Ni, and Fe-(0.51∼3.35 at%)Mo alloys have been measured by an electrochemical permeation method betwe…
The effect of F on the glass transition behavior of albite, diopside, and four other silicate melts has been investigated using scanning calorimetry. The addition of F to all silicate melts investigated results in a strong, nonlinear decrease of the glass transition temperature (Z' as recorded by the peak temperatures…
Silicon carbide composites reinforced with unidirectionally oriented carbon fibers have been fabricated by slurry impregnation followed by hot pressing. Identification of crystalline phases, observation of the metallographic structure, and measurement of flexural strength and fracture toughness at room and high temper…
The basic principles and practical considerations of Auger-Photoelectron Coincidence Spectroscopy (APECS) are discussed. In this technique, core photoelectrons and their associated Auger elecrtons are detected in time coincidence. For true coincidence counts, both electrons originate from the same photoexcitation even…