Materials Literature
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Field-assisted dissolution theory was the generally accepted mechanism for pore formation and development in porous anodic aluminum oxide (AAO). However, field-assisted dissolution rate or dissolution current has never been reported. The quantitative relationship between the length of AAO and total anodizing current J…
This paper describes the experimental and numerical study of structures used for protection against the harmful effect of bullet and fission elements. A special place among them is taken by spaced-apart structures in which a gap between layers is filled with either air or various light materials with good damping, dis…
A new multi-step, solution-phase method for the spontaneous deposition of tungsten from a room temperature ethereal solution is reported. This immersion process relies on the deposition of a sacrificial zinc coating which is galvanically displaced by the ether-mediated reduction of oxophilic WCl 6 . Subsequent thermal…
The paper presents a thermodynamic analysis of the methanation of carbon dioxide by hydrogen reduction. Equilibrium gas phase composition was determined by means of parametric equations. Calculations were performed for the temperature range T = 500 – 700 K and the initial composition . A crucial parameter for catalyti…
The structures of two isostructural phases of [ M (Еn) 3 ](ReO 4 ) 2 ( M = Ni, Zn; Еn is ethylenediamine) are studied. The crystal structures belong to the triclinic system, but demonstrate a pseudohexagonal packing motif. It is shown that the product of thermal decomposition of [Zn(Еn) 3 ](ReO 4 ) 2 (hydrogen atmosph…
Zinc oxide nanoparticles (ZnO NPs) are one of the most widely used nanomaterials in consumer products and industrial applications. As a result of all these uses, this has raised concerns regarding their potential toxicity. We previously found that candidate markers of idiopathic pulmonary fibrosis and lung cancer were…
Planothidium bilensis sp. nov. has an unusual contacting flap with two lensoids located opposite from each other, and a diagonal position of the sternum. Both lensoids contain one siliceous lenticular db-element and a lenticular cavity next to it, which form a double lens optical system. The main types as well as othe…
A model for the spall fracture and compaction of a damaged material based on a description of the motion of a single pore is proposed. The model takes into account the strength properties, the effect of pressure, surface tension, and viscosity of materials and inertial forces. Equations describing the dynamics of grow…
We present a UV irradiation study of three nanomaterials which have been investigated and published by peer review previously, specifically tantalum, tungsten and phosphorus doped TiO 2 .
AIM: To study neocollagenogenesis after implantation of polypropylene endoprosthesis and polypropylene combined with polylactic acid endoprosthesis on background of «potassium orotate» administration. MATERIAL AND METHODS: We used two different types of endoprosthesis in the experiment. The first type was made of just…
The coarse grained heat affected zone (CGHAZ) of T23 steel was assessed by strain-to-fracture (STF) tests during post-weld heat treatment (PWHT) at 750°C to investigate the microstructure changes and corresponding hot ductility. Scanning electron microscope (SEM), transmission electron microscope (TEM), and small angl…
This paper presents a model for heat and moisture transfer through firefighters' protective clothing (FPC) during radiation exposure. The model, which accounts for air gaps in the FPC as well as heat transfer through human skin, investigates the effect of different initial moisture contents on the thermal insulation p…
A unique and novel thin film of fluorine-doped tin oxide (SnO2:F) nanoflakes on ZnO nanorods were fabricated using nebulized spray pyrolysis technique (NSPT) and hydrothermal growth method, respectively, for ammonia and humidity sensing applications. XRD studies confirm the growth of a hexagonal wurtzite ZnO and a tet…
Vacuum filtration method was used in order to fabricate a homogeneous and uniform thin film of multi-layer graphene oxide on plastic substrate. This self-regulating technique allows the number of graphene oxide layer to be controlled thus controlling the film thickness by simply varying either the concentration of the…
Binary Ti-Al alloys containing 50 to 60 atomic percent aluminum are rapidly solidified by hammer anvil method under an argon atmosphere. Constituent phases in each alloy are identified by X-ray diffractometry and microstructures of the alloys are investigated using a transmission electron microscope. In alloys with al…
Electrodeposition of Fe, Pt and Fe–Pt on n-type Si (001) wafer was studied. The electrochemical nucleation and growth mechanism was investigated using conventional electrochemical techniques and morphological examinations. The current transients recorded during potentiostatic deposition were compared with the non-dime…
The preparation and characterization of titanium dioxide thin films modified with different amounts of bismuth using a two laser ablation plasmas configuration is reported. The plasmas were produced ablating simultaneously two different targets, one of bismuth and other of titanium dioxide, using a Nd:YAG laser with e…
Carbon nanotube (CNT) shows excellent and novel performances in the field of electrical engineering. The electrical properties of CNT consist of exceptional behaviour that will help to manufacture very tiny semiconductor device. However, due to the lack of research, CNT is still competing with the silicon material in…
The kinetics of spinel (Al-Si) crystallization from Algerian halloysite (DD1) was investigated using differential thermal analysis. Experiments were carried out on samples between room temperature and 1400 C with constant heating rate from 2 to 20 C min -1 . The activation energies measured from isothermal and non-iso…
Based on RLC series circuit of sensor electronic components with nonlinear capacitance research object, the first approximate solution of third superharmonic resonance of the nonlinear vibration system is obtained by means of the method of multiple scales for nonlinear oscillations. The third superharmonic resonance r…