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Article
Yellow luminescence in Mg-doped GaN
Optical thresholds, that correspond to a level located at 1 eV above the valence band, are observed by photocapacitance techniques in n-type Mg-doped GaN. In undoped GaN, this level has been previously related...
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Article
Performance evaluation of an independent wire rope core in a cage winder of a mechanized coal mine using nondestructive testing instrument
Nondestructive testing is an important means for assessment of performance of winder ropes. The visual method produces a possibility for inadequate inspection due to its subjectivity. Wire ropes wear out event...
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Article
Photosensitization of multiwalled carbon nanotube scaffolds with ZnO quantum dots for photovoltaic applications
In this article, we have decorated multiwalled carbon nanotubes (MWCNTs) scaffold with ZnO quantum dots (QDs, size in the range of 2.9–4.5 nm) and investigated their prospects for photovoltaic applications. Z...
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Article
Modeling of the temperature field in the chip and in the tool in high-speed machining of a carbon steel: effect of pearlite to austenite phase transition in AISI 1075
A one-dimensional transient finite-difference model for the temperature distribution in orthogonal metal cutting, which was originally developed by Boothroyd, and then improved upon by Tlusty, is used to calcu...
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Article
N Do** and Al-N Co-do** in Sol–Gel ZnO Films: Studies of Their Structural, Electrical, Optical, and Photoconductive Properties
We have studied the structural, electrical, optical, and optoelectronic properties of N-doped and Al-N co-doped ZnO films grown by sol–gel technique. Both the undoped and doped films have a hexagonal wurtzite-...
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Article
Inspection of 6X19 seale preformed haulage rope by nondestructive technique
Steel winding ropes used in aerial ropeways, deteriorate with use. Visual inspection is the most conventional method for evaluation of aerial ropes. But this method cannot evaluate the inner failure such as co...
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Article
Ambient dependent photoconductivity in Mg x Zn1−x O thin films
Mg x Zn1−x O (x = 0.0–0.08) thin films have been deposited on glass substrate by sol–gel technique and photoconductivity of the thin films have been inves...
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Article
A Pulse-Heated Kolsky Bar Technique for Measuring the Flow Stress of Metals at High Loading and Heating Rates
The National Institute of Standards and Technology (NIST) has developed an electrical pulse-heated Kolsky Bar technique for measuring the constitutive response of metals at heating rates of up to 6,000 K/s and...
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Article
Ultraviolet Photodetection Properties of a Pt Contact on a Mg0.1Zn0.9O/ZnO Composite Film
We report on the ultraviolet (UV) photodetection properties of a Pt contact on a sol-gel Mg0.1Zn0.9O/ZnO composite structure on a glass substrate. In the dark, the current–voltage (I–V) characteristics between th...
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Article
Optical studies on Mg x Zn1−x O wide band gap semiconductor in the perspective of phase equilibrium
Mg x Zn1−x O (x = 0.0–0.20) ternary alloyed thin films have been deposited by sol-gel technique at 550 °C. The studies on the change in c-axis lattice par...
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Article
Bias-Dependent Ultraviolet Photodetection by Au-Mg0.1Zn0.9O/ZnO-Ag Structure
We report on the bias-dependent photodetection of two different wavelengths of photons in the ultraviolet (UV) region by Au-Mg0.1Zn0.9O/ZnO-Ag structure deposited on a glass substrate by the sol-gel technique. Wi...
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Article
Radiance Temperature and Normal Spectral Emittance (in the Wavelength Range of 1.5 to 5 μm) of Nickel at its Melting Point by a Pulse-Heating Technique
The radiance temperature of nickel at its melting point was measured at four wavelengths (in the nominal range of 1.5 to 5 μm) by a pulse-heating technique using a high-speed fiber-coupled four-channel infrare...
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Article
Studies of the optoelectronic properties of ZnO thin films
ZnO thin films have been deposited on quartz glass, sapphire, and glass substrates by the sol-gel technique and subjected to different annealing ambients. X-ray diffraction measurements show that all the films...
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Article
Dependence of photoconductivity on the crystallite orientations and porosity of polycrystalline ZnO films
Hexagonal ZnO films deposited on quartz glass, sapphire and glass substrates by sol–gel coating are found to be randomly oriented; maximum randomness is found in the film on quartz glass substrate. All the fil...
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Article
Radiance Temperatures and Normal Spectral Emittances (in the Wavelength Range of 1500 to 5000 nm) of Tin, Zinc, Aluminum, and Silver at Their Melting Points by a Pulse-Heating Technique
The radiance temperatures at four wavelengths (in the range of 1500 to 5000 nm) of tin, zinc, aluminum, and silver at their respective melting points were measured by a pulse-heating technique using a high-spe...
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Article
Temperature Control of Pulse Heated Specimens in a Kolsky Bar Apparatus Using Microsecond Time-Resolved Pyrometry
Analysis of machining processes is important in the understanding and improving of manufacturing methods. The modeling of machining processes relies on high-strain-rate, high-temperature material properties. A...
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Article
Measurement of Specific Heat Capacity and Electrical Resistivity of Industrial Alloys Using Pulse Heating Techniques
The determination of the specific heat capacity and electrical resistivity of Inconel 718, Ti-6Al-4V, and CF8M stainless steel, from room temperature to near the melting temperatures of the alloys, is describe...
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Article
Calibration of a two-color imaging pyrometer and its use for particle measurements in controlled air plasma spray experiments
Advances in digital imaging technology have enabled the development of sensors that can measure the temperature and velocity of individual thermal spray particles over a large volume of the spray plume simulta...
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Article
Moving the pulsed heating technique beyond monolithic specimens: Experiments with coated wires
Pulsed heating experiments that measure high-temperature thermophysical properties using pyrometric measurement of the temperature–time history of metal specimens rapidly heated by passage of electric current ...
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Article
Posterior urethral valves: the scenario in a develo** center
We have reviewed 233 patients with posterior urethral valves treated in a single center in Calcutta, India, over the last 20 years: 37 were neonates, 75 were between 1 and 12 months, 88 were between 1 and 5 y...
