Materials Literature
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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…
Biologically synthesized silver nanoparticles were subjected for in vitro studies against fungal pathogens Cerotelium fici, Cercospora moricola and Phyllactinia corylea of mulberry. Biologically synthesized silver nanoparticles showed promising antifungal activity against assayed fungus.
Ten steroidal saponins have been isolated form the seeds of Hyoscyamus niger L. for the first time and their structures have been elucidated. Seven saponins belong to spirostane series, two are furostane-type and one is pregnane glycoside. Hyoscyamosides B, C and C2 are new steroidal saponins, which have never been re…
Polymer brushes are assemblies of macromolecules that are tethered by one end to a surface or interface. The advantage of polymer brushes over other surface modification methods (e.g. selfassembled monolayers) is their mechanical and chemical robustness, coupled with a high degree of synthetic flexibility towards the…
We present the design of a directional dual band six-cell distributed power amplifier (DPA) that can direct the amplified power to the output ports depending on the input RF frequency. Different from conventional DPA, the dual band DPA implements the composite right/left-handed (CRLH) transmission line (TL) structure…
In the late 1980s and again in the past few years, some turbine generator stator windings have apparently failed due to a mechanism variously referred to as spark erosion or vibration sparking. The mechanism can produce relatively intense sparking between the surface of the stator bar and the core. The intensity of th…
Poly(tetrafluoroethylene)(PTFE) thin films were coated onto metal substrates by a spin coat apparatus, vacuum evaporator and RF sputtering, and their adhesion and friction properties evaluated. PTFE thin film coated onto nickel-titanium (Ni-Ti) substrate by spin coating showed a low friction coefficient, however pull…