Materials Literature
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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…
A new method of laser manufacturing of quasi-periodic nanocompositions from the CNT-protein solution under the laser irradiation has been developed. The topography of such carbon nanotube composite material was investigated with making use of atomic-force microscopy.
Experimental studies of the reactions taking place between solid steel and Zn vapour at temperatures relevant for sherardising is reported. The process of sherardising is simulated by annealing of steel under Zn vapour in closed ampoules. The intermetallic phases formed during sherardising were investigated by means o…
The effect of the ferrite grain size on the fatigue strength of a low-carbon steel is studied. It has been shown that, as the ferrite grain size increases, the fatigue strength decreases due to plastic-flow localization. One of the explanations of this phenomenon is the beginning of the formation of periodical cellula…
Two series of functional polymers, α,ω‐bi[2,4‐dinitrophenyl][poly(ethylene oxide)‐b‐poly(2‐methoxystyrene)‐b‐poly(ethylene oxide)] (DNP‐PEO‐P2MS‐PEO‐DNP) and α,ω‐bi[2,4‐dinitrophenyl caproic][poly(ethylene oxide)‐b‐poly(2‐methoxystyrene)‐b‐poly(ethylene oxide)] (CDNP‐PEO‐P2MS‐PEO‐CDNP), were synthesized by anionic liv…
Poly(aniline‐co‐o‐anisidine) (P(An‐co‐o‐As))/sulfonated multiwalled carbon nanotubes (s‐MWNTs) composites were prepared by adsorption of P(An‐co‐o‐As) on MWNTs surface in a N,N‐dimethyl acetamide (DMAc) solution. This research demonstrated that it was possible to sulfonate MWNTs and use a copolymer as a substitute for…
An experimental determination of the effect of rotational skew in the alignment of the electrodes of a symmetrical cross capacitor shows that the capacitance as determined by the axial length is reduced by the skew. A theoretical model is introduced to explain the effect.
According to molar percentages of W6+ and V4+, 1, 2 and 3 at.-%W6+ respectively was added into VOSO4 solution in the process of hydrolysing VOSO4 and coprecipitation was formed. The W doped VO2 nanopowders were produced through heating the deposition at 500°C under highly pure argon atmosphere for 5 h. Powder X-ray di…