Materials Literature
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Recently, a number of graphene-like early transition metal carbides and nitrides named as MXenes were fabricated by exfoliating MAX phases in hydrofluoric acid at room temperature. From experiments results and theory calculations, MXenes are promising anode materials in batteries as well as in metal-ion capacitors. To…
Posidonia Oceanica waste was used as reinforcement in a polyethylene matrix and the obtained composites were characterised by a tensile test and morphological analysis. The fi brous material derived from P. Oceanica wastes was characterised by morphological, thermal and chemical analysis, and a subsequent treatment wi…
The main aim of this research is the production of different biopolymeric fibers by electrospinning and the determination of the optimum working parameters for each polymer analyzed. In particular, three different biopolymers have been studied: poly(lactic acid) (PLA), poly(ε-caprolactone) (PCL) and a synthesized poly…
Power transformers illustrate the majority of capital investment in transmission and distribution centers. Additionally, interruptions of power transformer have a significant economic Effects on the Performance of an electrical network. For this reason, the safe and reliable Performance relate directly to the Security…
Mg97−xZn1Y2Alx alloys with long-period stacking ordered (LPSO) structures were prepared by conventional casting method. The optical microscopy (OM), X-ray diffraction (XRD) and the scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) were used to analyze the microstructure of the…
Journal of Applied Mathematics and Computational Mechanics, Prace Naukowe Instytutu Matematyki i Informatyki, Politechnika Częstochowska, Scientific Research of the Institute of Mathematics and Computer Science, Czestochowa University of Technology
It was shown that the strength characteristics of the samples produced from thermoplastics (low density polyethylene, polyamide 6, Armamid, and polyethylene terephthalate) increase as a result of short vibration treating with a frequency close to that of natural vibrations of the structural elements.
A one-dimensional model describing the diffusion of intrinsic defects in lead zirconate titanate (LZT) films of nonstoichiometric composition during their high-temperature treatment is proposed. The model includes the diffusion of vacancies by lead and oxygen, the formation and decay of their associates, interaction w…
Abstract Investigations on the surface modification of the Ti-6Al-4V alloy by plasma electrolytic oxidation are reported here. The oxidation process was carried out in a solution containing a zirconium silicate (ZrSiO4) suspension and sodium hydroxide (NaOH). Anodising was realised at voltages in a range from 100 V to…
Four species of Achnanthes sensu stricto have been observed in several subaerial habitats/localities in Macedonia. The morphological features of all recorded species have been described based on light and scanning electron microscope observations. Two species posses similar morphological features as already described…
Neste trabalho, objetivou-se avaliar as propriedades de extratos aquosos obtidos da casca de Pinus oocarpa sob adição de sulfito de sódio e bissulfito de sódio e a possibilidade de emprego dos taninos da casca como adesivo para colagem de madeira. Para a casca de Pinus oocarpa, foram testadas oito formas de extração d…
The increasing ecological and environmental concerns have led to the development of natural fibre composites. Chemical treatments are usually used to modify the surface of fibre to improve the bonding between fibre and resin. Alkalization and acetylation were used in this study to treat the hemp fibre. It was found th…
The ring opening bulk polymerization of ε-caprolactam catalyzed by Maghnite-H+ was reported. Maghnite-H+ is a montmorillonite silicate sheet clay was prepared through a straight forward proton exchange process. The effect of the amount of catalyst, and temperature was studied. Increasing Maghnite-H+ proportion and tem…
Abstract Anodic aluminum oxide (AAO) has been fabricated in the 0.3 M oxalic acid at voltage range 20-60 V and temperature range of 35-50oC. The resulting nanoporous alumina surfaces were characterized by high resolution scanning electron microscopy, and the images were quantitatively analysed by means of an innovativ…
Polymer antireflection structures were fabricated by injection molding using anodic porous alumina or a Ni replica as a mold. An ordered array of tapered pillars or holes was successfully formed on the surface of polycarbonate plates. The obtained polymer antireflection structures exhibit a lower reflectance than a sm…
Partial discharge (PD) measurements have emerged as a dominant investigative tool for condition monitoring of insulation in high voltage equipment. But the major problem behind them the PD signal is severely polluted by several noises like White noise, Random noise, Discrete Spectral Interferences (DSI) and the challe…
Twelve new diatom species are described from remote locations in the western United States: Cymbella blinnii sp. nov., Cymbopleura maggieae sp. nov., Encyonema drakei sp. nov., E. pentoniae sp. nov., E. willeyorum sp. nov., Frustulia esandalliae sp. nov., Gomphonema darwinii sp. nov., G. evolutionensis sp. nov., Muell…
Ferroresonance is a widely studied phenomenon but it is still not well understood because of its complex behavior. It is “fuzzy-resonance.” A simple graphical approach using fundamental frequency phasors has been presented to elevate the readers understanding. Its occurrence and how it appears is extremely sensitive t…
The threshold values of the annual fluence of atomic oxygen (F AO ≈ 1020 cm−2), as well as the ratios of the energy-flux density of vacuum ultraviolet radiation of the solar spectrum to the flux density of atomic oxygen (Φ ν /Φ AO ≈ 8 × 10−15 mJ) were determined, which are characterized the influence of the synergisti…
Abstract The effect of hydrogen on short-term strength, low-cycle durability and planestress fracture toughness of 10Cr15Ni27 steel, 04Cr16Ni56 and 05Cr19Ni55 alloys at pressure up to 35 MPa and temperature 293. . . 773 K was investigated. The modes of hydrogen action for which the elongation , reduction of area , low…