Materials Literature
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Abstract The electronic absorption and magnetic circular dichroism (MCD) spectra, and differential pulse (DP) voltammograms of planar heterodinuclear phthalocyanine (Pc) dimers consisting of Pc and pyrazinoporphyrazine (PyZ), [Mt 2 PcPyZ (Mt = H 2 and Zn)] and of Pc and naphthalocyanine (Nc), [Mt 2 PcNc (Mt = H 2 and…
Abstract We investigated the crystallization and orientation development in melt spinning and tubular blown film extrusion of several different types of polypropylenes, including conventional high tacticity isotactic polypropylenes (iPP) and metallocene catalyst low tacticity iPPs and syndiotactic polypropylenes (sPP)…
The recently developed fast Fourier factorization method, which has greatly improved the application range of the differential theory of gratings, suffers from numerical instability when applied to metallic gratings with very low losses. This occurs when the real part of the refractive index is small, in particular, s…
Abstract We have studied the effect of subsequent gamma (γ) irradiation on the absorption spectra and the optical energy gap of ZnO thin films doped with Li (ZnO:Li). The optical transmission (T) and optical reflection (R) in the wavelength range 190∼800 nm of films deposited at 300 °C on sapphire, MgO or quartz subst…
During hot dip galvanising, the metal strip passes into the zinc bath at a temperature of ~460°C. Iron from the strip dissolves into the bath during this operation, leading to problems such as dross formation and pickup. The model described in the present paper has been created in an attempt to quantify and understand…
Maleevite, ideally Ba B2 Si2 O8, and pekovite, ideally Sr B2 Si2 O8, are two new mineral species found in boulders in the moraine of the Dara-i-Pioz glacier, the Alai range, Tien Shan, Garmskii district, northern Tajikistan. Both minerals occur as anhedral equant crystals from 0.5 to 2 mm in diameter. Crystals of both…
Abstract Summary: The well‐controlled reduction of polyketone carbonyl functional group was performed without chain degradation by using NaBH 4 in tetrahydrofuran (THF)/MeOH solvent mixtures. Three different families of flexible polyketones (alternating propene/CO “PCO”, hex‐1‐ene/CO “HxCO” copolymers, and “pulse feed…
In order to develop durable linen-like cotton yam with low temperature mercerization, pretreatment methods ensuring efficient and uniform penetration of the low temperature alkali solution into cotton yarn are studied. Pretreatments consisting of an alkaline scouring at higher NaOH concentrations and of a cellulase tr…
A two-phase flow model is developed to simulate the fiber motion in the nozzle of an air-jet spinning machine. The computational results coincide with the images captured by high-speed photography. Three parameters, the first nozzle pressure, the jet orifice angle, and fiber flexural rigidity, are discussed in terms o…
This study has focussed on three main areas. First, an evaluation of the physical attributes of cashmere tops available to commercial spinners; second, the influence of processing variables on the efficiency of producing cashmere tops from raw Australian cashmere; and third, the influence of design of cashmere ultrafi…
The N-terminal tau 2-19 peptide undergoes gelation, syneresis, and aggregation over a period of years. These changes may be approximated on a shorter time scale by agitation and partial dehydration. The anomalously enhanced (229 nm) ultraviolet resonance Raman (UVRR) imide II band reveals a common structural feature f…
This paper investigates means of exploitation of space charge measurement results in order to achieve information about chemical, physical and microstructural properties of dielectric materials. The derivation of quantities as mean volume density of space charge, threshold for DC space charge accumulation, apparent-tr…
Research on the use of biomaterials as vascular substitutes has been dominated in the past by studies focusing on the properties of the materials used. These need to be resistant to protein absorption and should allow cell colonization and integration of the biomaterial within recipient tissue. Despite promising persp…
A novel method was proposed to produce thermoplastic elastomers containing ground tyre rubber (GTR). The new proprietary technology is based on the fact that bitumen and related materials may contribute to the devulcanisation of GTR and act at the same time as plasticiser and compatibiliser in the blends. Blends conta…
Abstract The thermal behavior of polyamide 6/amorphous polyamide blends has been investigated as a function of blend composition and temperature. Crystal phase nature and stability are probed by a combination of thermal analysis, X‐ray diffraction and Fourier transform infrared spectroscopy. Ductility appears to be st…
Abstract Summary: A novel method was used to prepare poly(propylene)/montmorillonite/calcium carbonate nanocomposites by melt‐mixing, using pristine montmorillonite (MMT), hexadecyltrimethylammonium bromide (C16), calcium carbonate (CaCO 3 ) and a matrix in a twin‐screw extruder. Two different sizes of calcium carbona…
By analysing the physical mechanisms of heat and moisture transfer through textiles with PCM and carrying out the test of thermal regulating functional performance of PCM garment in climate chamber, the thermal regulating functional performance of PCM garments have been analysed and discussed in this paper. Both numer…
Abstract Twelve neutral stable complexes of ytterbium( III ) and erbium( III ) coordinated by anionic hydridotris(pyrazol‐1‐yl)borate and meso ‐tetraphenylporphyrinate, and its derivatives with different substituents in the para position of the phenyl groups, were prepared and characterized. Crystal structure analyses…
A cryogenic treatment (-306°F) was applied to C2 tungsten carbide (WC -6% Co) and compared with untreated carbide to determine if tool wear could be reduced during turning tests with medium density fiberboard (MDF). Both the tool force data and observation of the cutting edges indicate that tool wear was reduced. The…
Abstract The efficiency of heterogeneous nucleation of isotactic polypropylenes (iPP) with various isotacticity and MWD is estimated by an increase of the crystallization temperature ( T cr ). A bi‐component nucleating system, composed of a pimelic acid and a calcium stearate, was added to the polymeric matrix in the…