Dielectric Properties of Tuna at 2450MHz and 915MHz as a Function of Temperature.
properties of tuna
Materials Literature
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High Performance Metal Hydride Alloy for Rechargeable Battery Technology PLATINUM METALS ENHANCE ALLOY SURFACE PERFORMANCE
Nickel metal hydride ( N i M H) rechargeable battery technology i s currently the major competitor to well-established nickel c a d m i u m ( N i C a d) technology D u e to new legislation in the European U n i o n and elsewhere, N i C a d cells are gradually being replaced to reduce the use of toxic cadmium, and N i…
Signature analysis for leakage current waveforms of polluted insulators
Previous researchers have shown, using FFT spectrum analyzers, that arcing causes a significant increase in the third harmonic content of the leakage current of polluted insulators. This paper investigates the feasibility of using modern high resolution digital spectral analysis methods to obtain better spectral estim…
Evaluation of fatigue damage using a magnetic measurement technique
A series of strain-controlled fatigue tests were performed on 0.1 wt% C Fe-C alloy samples under different strain amplitudes. The measured coercivity of these samples was found to behave differently in the initial and final stages of fatigue. In the intermediate stage of fatigue it was found that coercivity tended to…
THE STRUCTURE OF THE FIRST CO-ORDINATION SHELL OF Pb ATOMS IN LEAD-SILICATE GLASSES: A MOLECULAR DYNAMICS STUDY
The structure of lead-silicate glasses, although being investigated for over sixty years, remains still controversial. One of the open questions is the structure of the lead subsystem: what are the basic structural units like, and how are they interconnected. In the literature the appearance of [PbO 4 ] n , or [PbO 3…
An accurate measurement of magnetostriction of thin films by using nano-indentation system
We have constructed a simple and sensitive tool for the measurement of magnetostriction of thin films. This tool is based on a commercial nano-indentation system, which enable the measurement of the elastic properties of small samples, such as thin films and precipitates, as well as the magnetostrictively induced defl…
Coupling of the remanent polarisation in thin film oxide ferroelectrics with nematic liquid crystals
The technique of domain visualisation, revealed by a film of nematic liquid crystal (NLC) on a ferroelectric crystal substrate, is demonstrated for the first time to be applicable to thin films of lead zirconate-lead titanate (PZT) ferroelectric ceramics. PZT film thicknesses <1 µm were deposited on indium tin oxide c…
Porphyrinogen tetraanion functioning as a polymetallic assembler: nickel-meso-octaethylporphyrinogen binding four transition metal ions at the periphery
Nickel(II)-meso-octaethylporphyrinogen dianion behaves as a π-extended ligand binding four M(CO)3 [M = Cr, Mo] fragments at the periphery, so that the porphyrinogen can assemble five metal centers around itself.
Initialization by erasing the surface potential of negatively charged insulators in scanning electron microscope (SEM) observation
Initialization, which is to erase the non-uniform surface potential of an insulator, is important for reproducible observation and interpretation of the contrast mechanism of negative charging. When primary electrons with an accelerating voltage (whose secondary emission yield is larger than unity) irradiate the surfa…
Dot Matrix Hardening of Steels Using a Fiber Optic Coupled Pulsed Nd:YAG Laser
This paper describes a novel process called “Dot Matrix Hardening” as applied to Ol, D2 and AISI 4340 steels. This process uses a pulsed laser (particularly an Nd:YAG laser) to create a uniform distribution of transformation-hardened spots to cover only a certain percentage of the desired surface. Due to significantly…
Dielectric susceptibility of the Coulomb glass
We derive a microscopic expression for the dielectric susceptibility $\ensuremath{\chi}$ of a Coulomb glass, which corresponds to the definition used in classical electrodynamics, the derivative of the polarization with respect to the electric field. The fluctuation-dissipation theorem tells us that $\ensuremath{\chi}…
Measurement of Interfacial Tension between Polymer Melts : Improved Imbedded Fiber Retraction, Breaking Thread and Dynamic Viscoelasticity Methods
We improved the imbedded fiber retraction (IFR) method as a simple method to obtain the interfacial tension between polymer melts. A force balance equation for a fiber in an immiscible matrix by Cohen and Carriere is solved for a more realistic fiber shape at later stage of retraction. Moreover, unknown hydrodynamic c…
Synthesis and Characterization of High Performance Polymeric Hybrid Siliconized Epoxy Composites for Aerospace Applications
Two different types of hybridized siliconized epoxy matrix systems have been developed using two commercially available (CIBA-GEIGY) epoxy resins with hydroxyl terminated polydimethyl siloxane. The percentage siloxane content in the epoxy systems have been optimized based on the physico-chemical, electrical, mechanica…
Electronic instabilities in compounds with hexagonal nets
Ab initio band structure calculations on some compounds with either hexagonal or triangular nets in their crystal structures are presented. The view taken is that electronic instabilities as manifested in certain visualisations of the electronic structures can be indicative of the presence of interesting ground states…
Wetness Comfort of Fine-polypropylene-fibre Fabrics
By means of conventional fabric-properties tests, the sweating-copper-mannequin test, and wearer trials, the wet comfort of polypropylene-fibre knitted fabrics is invested. We find that polypropylene-fibre fabric's wet comfort is strongly related to the fibre fineness, component fibre properties, and constructional fe…
Physicochemical Properties of Methyl Linoleate Oxidized at Various Temperatures
Methyl linoleate was oxidized at 60, 90, 120 and , respectively, with sparging oxygen for different periods of time. On the basis of the peroxide values determined at four temperatures, four heating times were chosen for the analysis of physicochemical parameters, such as peroxide value, total oxidation products, poly…
Microextensometry by Image Correlation Applied to Micromechanical Studies Using the Scanning Electron Microscopy
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Mineral Fillers in Thermoplastics: Filler Manufacture and Characterisation
The principal mineral fillers used in thermoplastics and the reasons for using them are identified, together with those features that have to be controlled in order to achieve the optimum results and to avoid associated deleterious effects. General methods of filler production are outlined in the light of these requir…
Systematic Study of Properties of Extrudates with Incorporated Metakaolin or Silica Fume
This study systematically investigates the properties of extruded cement-based short polyvinyl alcohol (PFA) fiber reinforced plates with added metakaolin and silica fume. The enhancing effects of the two mineral admixtures on the mechanical properties of the plates are compared by the direct tensile test, freezing an…
Calibration Specimens for Determining Energy-Dispersive X-ray k-Factors of Boron, Nitrogen, Oxygen, and Fluorine
: We have fabricated amorphous thin-film specimens containing light elements (B, C, N, O, F, and Mg) in addition to silicon, and have measured their composition using electron energy-loss spectroscopy (EELS). The films appear to be stable during storage in air and during irradiation by an electron beam, for doses belo…