Quantitative Analysis of Carbide Phases in Medium-Carbon Steel After Low-Temperature Tempering

Metallurgist - Structural features of high-strength wear-resistant steel formed after tempering at different temperatures are investigated. Temperature dependences are determined for steel hardness...     

Technology for the Visual Inspection of Aircraft Surfaces Using Programmable Unmanned Aerial Vehicles

Journal of Computer and Systems Sciences International - The technology for the visual inspection of aircraft surfaces using programmable unmanned aerial vehicles (drones) is presented. When...     

Self-Detection of High-Frequency Mechanical Oscillations of Whiskers in Quasi-1D Conductors with Charge-Density Wave

Heterodyne mixing with frequency modulation is employed for detection of torsional resonances of whiskers in rhombic TaS₃ (typical quasi-1D conductor) with charge-density wave (CDW). The dependences of both torque and the feedback signal of torsion on the internal properties of CDW are distinctive features of the proposed method. Sample placement in the vicinity of the electrode that serves as gate is unnecessary. Electromechanical and elastic properties of the CDW systems can be studied with the aid of the proposed method, at least, in the megahertz frequency range.     

The Thermochemistry of Crystalline M<Subscript>3</Subscript>AlF<Subscript>6</Subscript>, NaAlF<Subscript>4</Subscript>, KAlF<Subscript>4</Subscript> and Gaseous MAlF<Subscript>4</Subscript> Fluoroaluminates of Alkali Metals,M

The formation enthalpies of crystalline M₃AlF₆ and gaseous MAlF₄ are confirmed and refined and the formation enthalpy of KAlF₄(cryst.) is estimated for MF–AlF₃ systems (M is Li, Na, or K) with a minimum in the total saturated vapor pressure.     

Synthesis of Nanocrystalline Titanium Diboride in a Hypervelocity Plasma Jet

Results of experimental investigations of directly synthesizing nanocrystalline titanium diboride in a hypervelocity jet of electrodischarge plasma generated by a pulse high-current coaxial magnetoplasma accelerator with titanium electrodes are presented. The main result of the investigations is manufacturing a product with a mass of up to ～3 g containing more than 90% of titanium diboride obtained mostly in the form of hexagonal and dodecagonal particles.     

Forging furnace with thermochemical waste-heat recuperation by natural gas reforming: Fuel saving and heat balance

This paper considers thermochemical recuperation (TCR) of waste-heat using natural gas reforming by steam and combustion products. Combustion products contain steam (H₂O), carbon dioxide (CO₂), and ballast nitrogen (N₂). Because endothermic chemical reactions take place, methane steam-dry reforming creates new synthetic fuel that contains valuable combustion components: hydrogen (H₂), carbon monoxide (CO), and unreformed methane (CH₄). There are several advantages to performing TCR in the industrial furnaces: high energy efficiency, high regeneration rate (rate of waste-heat recovery), and low emission of greenhouse gases (CO₂, NO_x). As will be shown, the use of TCR is significantly increasing the efficiency of industrial furnaces – it has been observed that TCR is capable of reducing fuel consumption by nearly 25%. Additionally, increased energy efficiency has a beneficial effect on the environment as it leads to a reduction in greenhouse gas emissions.     

Over-the-Horizon Terahertz Surface Plasmon Locator

Journal of Infrared, Millimeter, and Terahertz Waves - The article demonstrates the possibility of creating an over-the-horizon locator with an information carrier of surface plasmon polaritons...     

Hereditary Effect of the Structure of the Charge on Density,Gas Content,and Processes of Solidification of an Al–Si–Cu Alloy System

Russian Journal of Non-Ferrous Metals - The effect of the structure of the initial charge density in liquid and solid states, as well as on the temperature–time parameters of the process of...     

Definition of the remaining life of power-transmission lines with cross-linked polyethylene insulation

XLPE-insulated cables and wires are becoming more widespread. For this reason, it is becoming necessary to control the state of insulation over its total operating life. Online monitoring of the effects on the insulation and determination of its remaining life becomes possible using modern equipment. In this paper, a method of determining the remaining lifetime of the cross-linked polyethylene insulation of the powertransmission line is presented. An insulation-aging model developed at the previous stage of the research was used. It is proposed to control the destructive effects on the insulation and calculate the remaining life based on the obtained data. The results of the research showed that the probability of failure is subject to the normal character of distribution (Gaussian distribution) as the insulation in the process of operation is exposed to a large number of effects (partial discharges, thermal actions, effect of the environmental factors, etc.). The remaining lifetime is defined as a function of inverse failure probability. The proposed method can be used to develop a set of devices for determining the remaining life of polyethylene insulation.     

Ensuring Strength in Laser Welds Made Using the Dispersion-Hardened EP693 Nickel Alloy

Russian Journal of Non-Ferrous Metals - The process of making a weld using the heat-resistant EP693 alloy (Ni–Cr–W–Co–Co–Mo system) to make assemblies and components...