Oscillations in the H2 oxidation reaction on ruthenium
Results of the initial step of investigation of oscillations detected for the first time in the hydrogen oxidation reaction over a supported ruthenium catalyst have been presented.
Materials Literature
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Experimental Investigations on Yttrium Borate Phosphate Phosphors with Codoped Ce3+ and Tb3+ Ions
Abstract Green phosphor of Y(BO3, PO4): Ce, Tb was synthesized by means of sol-gel and conventional solid state methods. The thermal formation process was characterized by thermogravimetric analysis (TG) and differential thermal analysis (DTA). The effects of synthesis conditions on the crystalline and morphological s…
Study on the Microstructure and Morphology of Sintering Process of SiC-TiB2 Composite
This research employs pressureless sintering process to study the impact of different amount of titanium diboride on the performance of silicon carbide-titanium diboride composite. Results show that: no new phase was produced, and the whole process is a solid-phases sintering process. In this experiment, it has the sm…
Synthesis of Spherical Carbon Nanoparticles via Sol-Gel and their Electrochemical Properties in Electrical Double Layer Capacitor
Spherical carbon nanoparticles were prepared by the polycondensation of resorcinol and formaldehyde using sol-gel method in the presence of cetyltrimethylammonium bromide (CTAB) and subsequent carbonization. Addition of carbon nanotubes (CNTs) in the precursor solution resulted in CNT/carbon porous composites. The eff…
Critical Current Characteristics and Flux Pinning in Fe-Based Pnictide Superconductor
The superconducting Ba1-xKxFe2As2(x = 0.4) single crystals were prepared by the so-called FeAs self-flux method. The critical temperature by ac susceptibility measurement was estimated to be about 36 K. The magnetic field and temperature dependences of critical current densities were investigated by an ac inductive me…
Preparation of Ag-TiO2@MnO2 and Degradation of Toxic Organic Pollutants under Visible Light Irradiation
Ag-TiO2@MnO2 nanoparticles prepared by two-step hydrothermal method were characterized by X-ray diffraction spectroscopy (XRD), transmission electron microscopy (TEM), Brunauer-Emmett- Teller (BET) and UV-Visible diffuse reflectance spectra (UV-Vis DRS). The degradation of rhodamine B (RhB) and 2, 4-dichlorophenol (2,…
Electromagnetic Performance Analysis of Claw-Pole Alternator with Changing Permeance
A changing air gap permeance model of the alternator and its influence were discussed in this paper. When the alternator was under high-speed operation, taking it into consideration that the claws getting deformation for rotating centrifugal force and electromagnetic exciting force, the alternator’s changing air gap p…
Surface Morphology Studies of Carbon Nanotubes Prepared by Thermal Chemical Vapor Deposition Using Fermented Tapioca as a Starting Material
Carbon nanotubes (CNTs) were deposited on silicon wafer (Si) by Thermal Chemical Vapor Deposition (TCVD). The new starting material of fermented tapioca was used as carbon source. The gas flow of Argon (Ar) was constant at 70 bubbles per minute and 20 minutes of deposition time. Before the deposition process, the sili…
Temperature dependence of the radiation-induced hardening of EP-823 steel after 7-MeV Ni++-ion irradiation
Ferritic-martensitic steel 16Kh12MVSFBR (EP-823) is irradiated with 7-MeV Ni ++ ions to fluences in the range of (2.7–6) × 10 20 ion/m 2 at temperatures of 350–600°C. The obtained temperature dependence of steel hardening after irradiation has a non-monotonic character with a maximum at 380°C. This dependence is deter…
Chemical structure of asphaltenes and preasphaltenes obtained by coal hydrogenation under high-speed heating conditions
The results of experimental studies on the determination of the chemical structure of asphaltenes and preasphaltenes in the liquid hydrogenates of coal from the Zashulanskoe field in Transbaikalia are reported. These results were obtained under the conditions of high-speed heating (∼200 K/min; reaction time, 10 min).…
Stability of Solid/Liquid Interface of Pb-80wt%Sn Alloy under Direct Current during Directional Solidification
The effect of medium-density current on the morphological stability of S/L interface of Pb-80wt%Sn alloy during directional solidification was investigated. The results indicated that both the DC of positive and negative 200 Acm-2 could decrease the critical growth rate of cellular/dendrite transition and minish the r…
Study on Anisotropic Mechanical Behavior at near Pre-Crack for AZ31B Sheet under Biaxial Stress
In this study, a biaxial tensile test of cruciform specimens containing centre notch was conducted in order to clarify the deformation behavior near the crack tip at the early stages of crack initiation when objected to a biaxial stress state. Results show that the hardness and stress value within the deformed zone in…
Polymer Fuel Cells in Underwater Platforms
The analysis of the available fuel cells technologies indicates that Polymer Electrolyte Membrane Fuel Cells (PEMFCs) currently offer the highest attainable efficiency. This technology has been especially useful for underwater applications, since the moment it reached the greatest mass and volumetric power density amo…
Studying the semiconductor-metal phase transition in nanoscale vanadium dioxide, doped with ions of 3d-elements on a silicon surface
Nanoscale vanadium dioxide doped with chromium and iron is obtained via molecular layering method on the surface of a single-crystal silicon. The qualitative and quantitative composition of the samples is determined by photometry and magnetochemical analysis. The morphology is examined by AFM and SEM. Two independent…
Prediction of Electromigration Induced Void and Hillock for IC Interconnect Structures
This paper investigates the electromigration (EM) induced void and hillock generation in IC interconnect structures. The driving force for electromigration induced failure considered here includes the electron wind force, stress gradient, temperature gradient, as well as the atomic density gradient, which were neglect…
Segregation Patterns and the Phase-Field 3D-Model for Adiabatic Phase Transition in Al-Cu Alloys
In the paper, a model basing on solute conservative in every unit is developed for solving the solute diffusion equation during solidification. The model includes time-dependent calculations for temperature distribution, solute redistribution in the liquid and solid phases. Three-dimensional computations are performed…
Scalable energetic-impact deposition of a mixture composed of multi-walled carbon nanotubes and silver nanoparticles
Homogeneous nanocomposite films composed of multi-walled carbon nanotubes (CNTs) and silver (Ag) nanoparticles were produced by using energetic-impact deposition (EID). The EID process of a mixture composed of CNT and Ag nanoparticles shows two important phenomena: (1) collision-induced particle growth of Ag nanoparti…
Formation of C-N-Si Film for Interlayer of Hard Material Coating by Pulsed Discharge Plasma CVD
Carbon nitride (C-N) and Si added C-N (C-N-Si) films were deposited on SKD61 steel plate by pulsed discharge (PD) plasma chemical vapour deposition (CVD). When the films were deposited with N2 and H2 diluted CH4 source gases, the deposition rate increased and the hardness decreased with increasing CH4 concentration. B…
Predicting the hardenability of structural steel on the basis of the decomposition kinetics of supercooled austenite
Calculation of the properties of low- and moderate-alloy structural steel is possible by modeling the decomposition kinetics of supercooled austenite at constant temperature and in continuous cooling. A model for predicting the microstructure of steel is derived by means of an artificial neural network of GRNN type. C…
Influence of Nanomaterial and Technology on Cellular Structure and Signal Transduction
Nanomaterial is a field that takes a materials science-based approach to nanotechnology. The toxicity and values of nanomaterial are largely dependent on their effects on cellular structure and function. Research has focused on the cellular internalization and metabolism of nanomaterial. Little attention was paid to t…