Materials Literature
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This paper presents both investigations of high-energy luminescence with maximum at 7.5 eV in BaF2:Y3+and BaF2:Yb3+crystals and theoretical calculations of cross-luminescence spectrum in crystals of barium fluoride with interstitial ions of fluorine. The dependencies of the 7.5 eV emission intensity as function of dif…
The calibration of apparent charge, which can be traced to AC voltage and capacitance, for partial discharge(PD) calibrator is discussed. The methods of fast sampling measurement of peak-to-peak amplitude for step voltage by digital multimeter and the arithmetic in the automatic measurement of apparent charge by digit…
Using modern methods of analysis, investigations of the phase composition, structure, and properties of powders of aluminum oxide synthesized by the plasmochemical method are carried out. The possibility of plasmochemical technology of treatment of dispersed raw materials for obtaining submicrometer and nanodimensiona…
The comparison between calculated and measured dose rates of the cask for 12 spent fuels has been performed and this result confirms the shielding integrity of KN-12 transport cask to transport the spent fuel with safe. In February 2007, the dose rate measurements of KN-12 cask were performed in the spent fuel deconta…
Abstract:- For enhancement the insulation quality of medium voltage and high voltage power cables, on-site partial discharge (PD) diagnosis tests such as detection, location and identification are used to find defects or faults and assess ageing degree of the cable insulation. Typical test methods such as oscilating v…
The effect of various material and testing parameters on the static and dynamic failure mechanisms of cotton ring yarns of several counts has been studied. The yarn broken ends are classified into three groups, namely sharp, taper and slipped ends, based on their captured breaking zone images. The percentage of sharp…
Experimental investigations concerning the synthesis of Si 1−x Ge x O 2 solid solutions with quartz structure have been carried out under solvothermal conditions from sol-gel preparations. The cell parameters of the powders have been determined by X-ray powder diffraction. The amount of germanium inside the SiO 2 stru…
This paper focuses on the technology currently available for the production of severely refined, corrosive sulphur free base fluids used in the formulation of high quality transformer fluids. It will discuss the formulation, evaluation and performance characteristics of transformer fluids manufactured from corrosive s…
A test system to detect partial discharges in transformer oil insulation, using an UHF sensor has been developed. The UHF sensor is basically a duel arm Archimedean spiral antenna with a frequency response of 300 -3000 MHz. The UHF signal is amplified using an RF amplifier and analysed both in time and frequency domai…
The electric response of Sn2P2S6 semiconductor ferroelectric films to focused laser radiation (λ = 6328 Å) with a modulation frequency of 24 Hz is studied experimentally. It is shown that the signal involves an initial spike of current (an unsteady component) followed by the relaxation decrease to a certain value (a q…
Normal mode studies are reported for l‐proline l‐hdroxyproline, a fragment of collagen. A comparision of amide I mode in peptide with that in collagen shows the presence of such sequences in collagen. Other possible sequences show appreciable differences, and hence they are not likely to be present in large numbers.
The structural features of hexadecafluorinated copper and zinc phthalocyanine (MPcF 16 ) films (M = Cu, Zn) obtained by vacuum thermal deposition are investigated. The dependence of structural features of these films on the film thickness is studied by means of optical and Raman spectroscopy. It is shown that an incre…
The current interest in returning human exploration to the Moon and Mars makes cost-effective and low-mass health monitoring sensors essential for spacecraft development. In space, there are many surface measurements that are required to monitor the condition of the spacecraft including: surface temperature, radiation…
Neste trabalho, hidrogéis condutores do tipo semi-IPN constituídos por poliacrilamida (PAAm) e polímero intrinsecamente condutor poli(3,4-etileno dioxitiofeno)/poli(estireno-sulfonato) (PEDOT/PSS) foram sintetizados e suas propriedades hidrofílicas, mecânicas, condutoras e ópticas foram caracterizadas por meio de plan…
The effects of S addition on the corrosion behavior of Cu-containing austenitic stainless steel in 18.4 N sulfuric acid (H2SO4) at 80°C to 120°C were investigated using polarization testing, immersion testing, metallographic examination, x-ray photoelectron spectroscopy (XPS), and scanning Auger multi-probe (SAM) anal…
There are no especially hazardous industrial objects in the northeast of Russia that could cause great human losses or lead to ecological catastrophes (emergency situations). The accidents that have happened due to brittle fracture of metal structures mostly caused great economic losses. For example, in the early 1980…
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Two massive sulphide ore samples from the Outokumpu mine, eastern Finland, were studied by ore microscopy and electron microprobe analysis. The main minerals are pyrrhotite, pentlandite, chalcopyrite, and sphalerite with accessory galena and molybdenite. The matrix contains euhedral crystals of homogeneous or zoned es…
This paper investigates an upstanding nonlinear controller for controlling a single-degree-of-freedom shape memory alloy (SMA) actuated manipulator and proposes a novel nonlinear PID (NPID) controller suitable for real time manipulator control applications. The salient features of this controller are that it has signi…
While it is important that ultra-capacitors should be charged to their maximum rated voltage for getting maximum energy out of them, at the same time any overcharging or temperature rise reduces their lifetime. When charging ultra-capacitors with switch mode converters, the ripple current through them and the signific…