Materials Literature
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Aluminum bronze which has high corrosion resistance, high strength and easy castability is recently expected as a new plastic mold or a shell mold core material in place of steel conventionally used. On the other hand, it is reported that the EDMed surface with metal powder mixed fluid has smaller surface roughness an…
Real-time monitoring and control of the growth of plasma-deposited gradient-index structures by multiwavelength phase-modulated ellipsometry are presented. An efficient method for estimating the optical parameters based on a least-squares fitting on the most recent recorded measurements is described. This method is us…
Highly crystalline and single-walled micrometer-sized carbon tubes several centimeters in length have been prepared via the pyrolysis of composite fibers consisting of a thermally stable polypyrrole skin layer and a thermally degradable PET core fiber.
Samples of cobalt oxide spinel doped with a range of cations (Li, Ni, Zn, Cu, Al, Ga, Mn, Ti, Sn, Ge) have been prepared and examined by X-ray diffraction and X-ray photoelectron spectroscopy. Surface enrichment in the dopant species is frequently observed. Determination of the ratio of the two cobalt oxidation states…
A quantitative fracture model is presented for slow crack growth in amorphous silica. The model is based on semiempirical quantum molecular orbital calculations using the Austin method AM1. The fracture of three-, four-, five- and six-member silica rings is modelled in four cases to determine the reaction pathways und…
The kinetics of structural change of a highly ordered kaolinite intercalated with potassium acetate have been studied through both intercalation and deintercalation. Deintercalation of the intercalated kaolinite, brought about by washing for different time intervals was followed by both X-ray diffraction and Raman mic…
Abstract : The values of the dielectric constant of simple molecules is discussed first, along with the relationship between the dielectric constant and other physical properties such as boiling point, melting point and refractive index. The Debye equation shows the relationship of dielectric constant with the polariz…
Diatoms were examined from the skin of a male sperm whale (Physeter macrocephalus L.) stranded on the Belgian shore in 1994 on its return from the northern Atlantic to more southern latitudes. The morphology (LM and SEM) and taxonomy of the three ceticolous taxa present are discussed. Epiphalaina aleutica Holmes, Naga…
Textile construction is well known for having a significant effect on the ballistic response of fabrics. One possible mechanism for this effect is the change in yarn-yarn interaction with changes in weave geometry. During an impact event, strain waves propagate through both fill and warp yarns. Energy transfer from wa…
In this paper the authors present a two-step algorithm for predicting the core losses in an electrical machine. As a first step, the flux patterns in the cross section of the machine are calculated by using a time stepped two-dimensional finite element (FE) model, neglecting hysteresis and eddy currents in the laminat…
Regular fast Fourier transform (FFT) algorithms require uniformly sampled data. In many practical situations, however, the input data is nonuniform, and hence the regular FFT does not apply. To overcome this difficulty the authors have proposed an accurate algorithm for the nonuniform forward FFT (NUFFT) based on a ne…
Mesophase forming chromophores are an important challenge of material science. This article describes the synthesis of new perylene mesogenes 10. The materials were obtained by twofold Diels-Alder reactions of our recently published 1:1 isomeric mixture of 3,9- and 3,10-dialkylperylenes with N-heptadecyltriazoline-3,5…
This paper evaluates the anisotropic stress corrosion cracking behaviour of high-strength prestressing steel wires. To this end, two eutectoid steels in the form of hot rolled bar and cold drawn wire were subjected to stress corrosion cracking tests in aqueous environments using a constant strain technique and precrac…
Colloidal processing is well known to be an effective method to avoid the agglomeration of particles in powder processing. In this method, particles are dispersed by the electrostatic repulsion arising from their surface charge which can be controlled by the pH-value of the suspension. Since fine particles tend to agg…
Raw naturally coloured and white cotton cellulose fibres were investigated by Fourier transform near-infrared (FT-NIR) spectroscopy and chemometric methods, namely principal component analysis (PCA). In general, the white cotton exhibited bands that could be associated with the structural features of the cotton cellul…
The reaction of [NEt4]2[Pt(mnt)2] {mnt = [S2C2(CN)2]2–} with [Pt(CNMe)4][PF6]2 gave the diamagnetic ‘stacked’ salt [Pt(CNMe)4][Pt(mnt)2]. In acetonitrile, nitromethane and nitropropane solution respectively, treatment of [NEt4][Pt(mnt)2] with [Pt(CNMe)4][PF6]2 yielded three different crystal forms of the salt of 1∶2 s…
The effort discussed here addresses the use of shorter incident wavelengths for characterizing sub-0.1 μm linewidths and the corresponding influence on scatterometry measurement sensitivity to linewidth variations. A sensitivity metric, based on the variance statistic, was developed using well-characterized, large-pit…
Dynamic and a static methods for measuring thermal conductivity of textiles have been developed, and the measuring processes and results are described in detail in this paper. Three different textile materials are used for the actual test. and the data are analyzed, illustrated, and compared. Moreover, a theoretical m…
A titanium sonotrode is used to demonstrate that ultrasonic irradiation significantly enhances the rate of electrochemical oxygen reduction and hydrogen evolution reactions in neutral aqueous electrolyte.
The structural pressure dependence of strontium has been studied using angle-dispersive powder diffraction techniques with the image plate detector system. The two-dimensional diffraction data has allowed the clear identification of an accompanying minor phase in the Sr-III stability range which has enabled the struct…