PHILOSOPHICAL PROBLEMS OF ECOLOGICAL SAFETY OF MANKIND
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NUMERICAL ANALYSIS OF GAS-DROPLET CHEMICAL PLUG-FLOW REACTOR OPERATING MODES
A one-dimensional model and numerical solution of the non-stationary modes of the adiabatic gas-droplet chemical plug-flow reactor are considered. The developed approach permits to investigate processes of heat and mass transfer in the laminar flow of the reacting gas mixture with hydrocarbon fuels droplets. It may be…
MATHEMATICAL SIMULATION OF USER SATISFACTION PARAMETERS AND ORGANIZATION MANAGEMENT QUALITY SYSTEM EFFICIENCY
The problem of mathematical model in complexation of production, work, services quality parameters is solved. Distribution of rank weights among and within quality parameters groups is considered. Distribution of quality parameters is described by the hyperbolic rank function. The method permits to plan work on qualit…
Simulated body fluid and water absorption effects on poly(methyl methacrylate)/hydroxyapatite denture base composites
Poly(methyl methacrylate) (PMMA)/hydroxyapatite (HA) composite has potential application in denture base materials. The denture base materials should exhibit good mechanical properties and dimensional stability in moist environment. Silane coupling agent [3-methacryloxypropyltrimethoxy silane (γ-MPS)] was used to trea…
Local environment and oxidation state of a Mn impurity in SrTiO3 determined from XAFS data
The local environment and oxidation state of a Mn impurity in strontium titanate doped with 3% Mn were studied by X-ray absorption fine structure spectroscopy. The effect of the synthesis conditions on the incorporation of the impurity into A and B sites was studied. It was established that Mn ions substituting for Ti…
Micropatterning and characterization of electrospun poly(ε‐caprolactone)/gelatin nanofiber tissue scaffolds by femtosecond laser ablation for tissue engineering applications
Experimental investigations aimed at assessing the effectiveness of femtosecond (FS) laser ablation for creating microscale features on electrospun poly(ε-caprolactone) (PCL)/gelatin nanofiber tissue scaffold capable of controlling cell distribution are described. Statistical comparisons of the fiber diameter and surf…
Temperature and Light Induced Bistability in a Co3[Os(CN)6]2 6H2O Prussian Blue Analog
To expand the field of new cyanide materials of the 5d elements, we incorporated the [Os(CN)(6)](3-) anion into PB architectures in combination with the Co(II) cation. Herein, we report the first example of a photomagnetic PB analog containing Os(III) ions. In a similar vein as the prototypical CoFe PB analogs, this c…
Effect of surface stresses on the vibration and buckling of piezoelectric nanowires
In this letter, we analyze the influence of surface stresses on the vibration and buckling behavior of piezoelectric nanowires by using the Euler-Bernoulli beam model. The effect of surface stresses is considered by applying a curvature-dependent distributed transverse loading along the beam. It is found that the reso…
Iodine-125 radiolabeling of silver nanoparticles for in vivo SPECT imaging
Silver nanoparticles are increasingly finding applications in medicine; however, little is known about their in vivo tissue distribution. Here, we have developed a rapid method for radiolabeling of silver nanoparticles with iodine-125 in order to track in vivo tissue uptake of silver nanoparticles after systemic admin…
Intrinsic ferromagnetism and magnetic anisotropy in Gd-doped ZnO thin films synthesized by pulsed spray pyrolysis method
This paper reports an in-depth study on nanocrystalline Gd-doped ZnO thin films synthesized using versatile pulsed spray pyrolysis method and exhibit room temperature ferromagnetism. The detailed structural and microstructural studies confirm that the doped Gd ions occupy Zn sites and the peak shift can be elucidated…
Oligomeric isosorbide esters as alternative renewable resource plasticizers for PVC
Abstract Oligo(isosorbide adipate) (OSA), oligo(isosorbide suberate) (OSS), and isosorbide dihexanoate (SDH) were synthesized and evaluated as renewable resource alternatives to traditional phthalate plasticizers. The structure of the synthesized oligomers was confirmed by nuclear magnetic resonance spectroscopy ( 1 H…
Low temperature synthesis of magnesium oxide and spinel powders by a sol-gel process
Magnesium oxide and magnesium aluminate (MgAl2O4) spinel (MAS) powders have been synthesized by a simple aqueous sol-gel process using citrate polymeric precursors derived from magnesium chloride, aluminium nitrate and citrate. The thermal decomposition of the precursors and subsequent formation of cubic MgO and MAS w…
Urbach tail studies by luminescence filtering in moderately doped bulk InP
The shape of the photoluminescence line registered from a side edge of InP wafer is studied as function of the distance from the excitation spot. The observed red shift in the luminescence maximum is well described by radiation filtering and is consistent with the absorption spectra. Our method provides an independent…
Metal-insulator transition induced by fluctuations of the magnetic potential in semiconductors with magnetic impurities
We investigate the metal-insulator transition occurring in semiconductors with magnetic impurities when lowering temperature. In contrast to the usually considered percolation transition in the non-uniform medium induced by the localization of charge carriers in the fluctuating \emph{electric} potential, the studied t…
A search for defect related ferromagnetism in SrTiO3
Room temperature ferromagnetic hysteresis is observed in commercial SrTiO3 substrates purchased from a variety of suppliers. It is shown that the ferromagnetic signal comes from the unpolished surfaces. Surface impurity phases cannot be detected using either x-ray diffraction or energy dispersive x-ray spectra on the…
Interplay between Charge Order, Ferroelectricity, and Ferroelasticity: Tungsten Bronze Structures as a Playground for Multiferroicity
Charge order is proposed as a driving force behind ferroelectricity in iron fluoride K(0.6)Fe(0.6)(II)Fe(0.4)(III)F(3). By means of density functional theory, we propose several noncentrosymmetric d(5)/d(6) charge-ordering patterns, each giving rise to polarization with different direction and magnitude. Accordingly,…
Electron spin coherence and electron nuclear double resonance of Bi donors in natural Si
Donors in silicon hold considerable promise for emerging quantum technologies, due to the their uniquely long electron spin coherence times. Bi donors in silicon differ from P and other Group V donors in several significant respects: they have the strongest binding energy (70.98 meV), a large nuclear spin (I = 9/2) an…
Tuning the thermal conductivity of graphene nanoribbons by edge passivation and isotope engineering: A molecular dynamics study
Using classical molecular dynamics simulation, we have studied the effect of edge-passivation by hydrogen (H-passivation) and isotope mixture (with random or superlattice distributions) on the thermal conductivity of rectangular graphene nanoribbons (GNRs) (of several nanometers in size). We find that the thermal cond…
Effect of doping and oxygen vacancies on the octahedral tilt transitions in theBaCeO3perovskite
We present a systematic study of the effect of Y doping and hydration level on the structural transformations of ${\text{BaCeO}}_{3}$ based on anelastic spectroscopy experiments. The temperature of the intermediate transformation between rhombohedral and orthorhombic $Imma$ phases rises with increasing the molar fract…
Breakdown of the semi-classical conduction theory in approximants of the octagonal tiling
We present numerical calculations of quantum transport in perfect octagonal approximants. These calculations include a Boltzmann (intra-band) contribution and a non-Boltzmann (inter-band) contribution. When the unit cell size of the approximant increases, the magnitude of Boltzmann terms decreases, whereas the magnitu…