Poly (ethyl methacrylate) by XPS
XPS measurements for poly (ethyl methacrylate). The data include the valence band region and the principal core levels.
Materials Literature
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Coquandite, Sb6O8(SO4).H2O, a new mineral from Pereta, Tuscany, Italy, and two other localities
Abstract Coaquandite, a new antimony oxy-sulphate hydrate, occurs as spheroidal knobs of silky fibres or, rarely, as tiny transparent colourless lamellar crystals on stibnite at the Pereta mine, Tuscany, Italy; it is associated with klebelsbergite, peretaite, valentinite, sulfur, gypsum, stibiconite, and senarmontite.…
Pyroelectric properties of lead zirconate titanate based ceramics with a rhombohedral ferroelectric phase transition
The lead zirconate rich lead zirconate titanate based ceramics present high pyroelectric coefficient as well as low dielectric constant in their rhombohedral ferroelectric phase transitions, and therefore possess many desirable properties for potential applications in pyroelectric devices. The dielectric, pyroelectric…
Production of unusual bacterial polyesters by Pseudomonas oleovorans through cometabolism
Pseudomonas oleovorans is an adaptable, aerobic bacterium that can produce a wide range of storage polyesters (poly-β-hydroxyalkanoates, PHAs). With few exceptions, the PHAs obtained when this bacterium is grown with single organic substrates capable of polymer production are generally copolymers. With two different p…
NONDESTRUCTIVE MEASUREMENT OF MOISTURE DIFFUSION COEFFICIENT IN WOOD DRYING
The computer tomography(CT image of wood was analyzed to estimate the moisture content from CT number. Comparing moisture contents, densities and CT numbers, moisture distributions were nondestructively determined by CT numbers detected with the scanner. By periodically measuring CT images of the same cross section of…
Chemical Vapor Deposition of Cu Film on SiO2 Using Cyclopentadienylcoppertriethylphosphine
Chemical vapor deposition of Cu film on SiO 2 has been studied using cyclopentadienylcoppertriethylphosphine (C 5 H 5 CuP(C 2 H 5 ) 3 ), which contains no oxygen atom itself. The deposited Cu films had complete (111) preferred orientation for deposition temperatures below 450°C. From Auger electron spectroscopy measur…
Verträglichkeit von kautschuken ein altes und ein aktuelles problem
Abstract The utilization of rubber mixtures is to achieve a desired combination of properties and performance spectrum of elastomers is nowadays of a considerable technological and economical importance. The successful implementation of this concept requires the knowledge of the factors governing both the phase behavi…
Finite Deformation Analysis of Pressure-Shear Plate Impact Experiments on an Elastohydrodynamic Lubricant
Pressure-shear plate impact experiments on an elastohydrodynamio lubricant (5P4E) are interpreted by means of a full finite deformation analysis of stress wave propagation in an elastic/viscoplastic material. The elastic response is modeled as that of a neo-Hookean solid, modified to include compressibility in such a…
Linear and nonlinear optical properties of cumulenes and polyenynes: a model exact study
Model exact static and frequency-dependent polarizabilities, static second hyperpolarizabilities and THG coefficents of cumulenes and polyenynes, calculated within the correlated Pariser-Parr-Pople (PPP) model defined over the pi-framework are reported and compared with the results for the polyenes. It is found that f…
Magnetic Properties of Sm2Fe17Nx
Sm2Fe17Nx(x=3), of purity 95 vol%, was obtained by nitrogenation of Sm2Fe17alloy using a mixture of NH3(0.35 atm) and H2(0,65 atm) gases. The saturation magnetization 4πI, was 15.5 kG, and the anisotropy field Hawas found to be 220 kOe. Aligned Sm2Fe17N3powders with an average grain size of 3 μm showed a (BH)maxvalue…
Polymer lifetime studies in hostile environments
Abstract Photo‐oxidative degradation reactions are mainly responsible for reduced lifetime in polymers. These reactions are responsible for the decay in useful physical and chemical properties of polymers. In addition to high ultraviolet radiation doses, hostile environments have increased temperature, high humidity,…
Synthesis and degradation of polyhydroxyalkanoates in Alcaligenes eutrophus
The kinetics and mechanism of the synthesis and degradation of polyhydroxyalkanoates (PHA) in Alcaligenes eutrophus have been studied. PHA polymers were accumulated in the cells in nitrogen-free mineral media containing various carbon substrates, and the accumulated PHA polymers were subsequently degraded after the ca…
Structure of the M 2 CuWO 6 System, with M = Ba or Sr
Abstract The crystalline structure of the M 2 CuWO 6 phases with M = Ba or Sr was obtained from X-ray powder diffraction at room temperature with CuK α radiation. The phases are isostructural with tetragonal unit cells, space group I4/m and Z = 2. The parameters for the Sr 2 CuWO 6 phase are: Mr = 518.6, a = 5.42693(5…
Effect of Biaxial Stretching on Thickness Uniformity and Surface Roughness of PET and PPS Films
Abstract Surface roughness and thickness uniformity are two of the most important parameters to control in the manufacture of polymeric films. In this paper, we present the results of a detailed experimental study on the effect of biaxial stretching variables on these parameters in polyethylene terephthalate and poly…
Argon Implanted into Graphite, by XPS
Argon ions (Ar+) were implanted into a substrate of natural graphite (crystal) by 4 kV acceleration for a period of 5 min using a VG EX05 ion gun. (The surface plane of the substrate was perpendicular to the flight path of the argon ions.) No attempt was made to maximize the argon concentration within the graphite. Th…
Friction spinning-A critical review
The ability to achieve high twisting rates without the need to rotate the heavier mechanical elements and the low yarn tensions enable very high delivery rates with friction spinning. The soft handle of the yarn, versatility to handle all types of fibres and the core spinning facility are the other meri.ts of this sys…
KCeSe4: eine neue Lanthanoidpolychalcogenid‐Festkörperverbindung
Aus Cer und Kaliumpolyselenid in der Schmelze ist KCeSe 4 zugänglich. Die Struktur dieses neuartigen Lanthanoidpolychalcogenids ist verwandt mit der CuAl 2 ‐Struktur, und Ce und Se bauen anionische Schichten mit K + Ionen in den Zwischenräumen auf. Die Ce 3+ ‐Ionen sind quadratisch‐antiprismatisch von acht Se ‐Einheit…
Boron, Phosphorus, and Alkaline Earth-Metal Mixed Oxides as Active Catalysts in Partial Oxidation of Methane into Formaldehyde
Abstract Alkaline earth element-added boron and phosphorus mixed oxides supported on Cab-O-Sil showed high catalytic activity in partial oxidation of methane to HCHO at < 773 K. The results of the experiment using 18O2 suggested that the lattice oxygen atoms of the catalyst are responsible for the oxidation.
A theory of spin reorientation and piezomagnetic effect in noncollinear Mn3AgN antiferromagnet
Symmetry analysis of possible magnetic structures with k = 0 and of phase transitions is described for the metallic perovskites Mn3MN (M = Ni, Ga, Ag, Sn, Zn). The phase transition from a triangular antiferromagnetic structure to a triangular noncomplanar structure is considered phenomenologically in detail. Theoretic…
Near-Infrared Spectroscopy of Silicon-Containing Materials
Silicon is the second most abundant element in the earth's crust and occurs widely in nature as silica (silicon dioxide) or as silicate minerals. Although these materials have many uses, the most extensive use of silicon is found in the materials which can be derived from these inorganic precursors. These derivatives…