814 Result(s)
within
**-**a Ding
Characterization and Evaluation of Materials
Nanotechnology
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Article
The Influence of Pore-Structure on the Compressive Strength of Hardened Cement Paste
The pore-structure strongly influences the compressive strength of hardened cement paste (hcp) and other porous materials, as well as other mechanical properties. The simplest but most currently used expressio...
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Article
Exafs Analysis of Ionomers
Extended x-ray absorption fine structure (EXAFS) spectroscopy has beensuccessfully applied to the analysis of the ionic domain microstructure inzinc and rubidium neutralized ionomers. In dehydrated zinc neutra...
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Article
Ion-Beam Mixing and Amorphization in Au/Zr Bilayers
Au/Zr bilayer films with inert-gas markers were produced by low energy (< 4 keV) implantation. Mass transport was measured during ion-beam mixing with 1 MeV Kr at several temperatures between 330 and 540K. Two...
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Article
Laser-Initiated Aluminothermic Reaction Applied to Preparing Mo-Si Film on Silicon Substrates
Mo-Si films on silicon substrates has been prepared by the CO2 laser-initiated aluminothermic reaction. The features of these films have been characterized by RBS, AES, etc. The formation mechanism is discussed.
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Article
Ion Beam Method to Study Fractal Aggregation of Magnetic Particles on Thin Solid Films:
This paper presents the experimental observations of Fractal Aggregates on thin solid films after either directly thin film deposition or additional ion irradiation. A linear correlation was found between the ...
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Article
Investigation of the Interface Integrity of the Thermally Stable Wn/GaAs Schottky Contacts
WNx,/GaAs Schottky contacts formed by reactive sputtering were found to be thermally stable up to an annealing temprature of ∼9400°C. The interface morphology and structure of this contact under high temperature ...
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Article
Magnetic hyperfine fields in ultrathin Ni films on Cu(100)
The magnetic hyperfine field was measured at 111In(111Cd) probe atoms in ultrathin Ni films epitaxially grown on Cu(100) utilizing the perturbed γγ-angular correlation (PAC) method. The behaviour of the hyperfine...
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Article
Metastable Phase Formation in the Y-TI System by Ion Mixing
Amorphization behavior was studied for the Y-Ti system, which has rather positive heat of formation being around + 22 kJ/mol, by room temperature 360 keV xenon ion mixing of YxTi100-xmultilayered films to various...
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Article
Al-Yb Amorphous Alloys Produced by Ion Mixing or Solid State Reaction
We report, in this paper, three different ways of producing amorphous alloys in the Al-Yb system, (i) Al80Yb20multilayered films were readily amorphized by 180 keV xenon ion mixing at room temperature(RT) to a do...
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Article
Defect States in Hydrogenated Amorphous Silicon-Sulphur Alloys by ESR and PAS
We have presented ESR and PAS measurements for a series of a-SiS:H and a-Si: H films deposited by glow discharge at different parameters. The spin density in a-SiS:H alloys measured by ESR is essentially indep...
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Article
Irradiation Effect of Slow Neutrons on Mechanical Behaviour Related to Flux Pinning In YBa2Cu3Oy
Internal friction and modulus in YBa2Cu3Oy, which are related to flux pinning, were examined by means of the vibrating reed technique before and after the slow neutron irradiation to different fluences. Both the ...
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Article
Sol-Gel and RF Sputtering Thin Film Coatings for Fiber Optic Sensor Applications
Thin film coating techniques appear to have many advantages over other techniques for immobilization and incorporation of chemical indicators to optical waveguides in develo** dye based fiber optic chemical ...
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Article
Characterization of A-Si: H and A-SiGe: H Films in Liquid Crystal Light Valve
A-Si: H and a-Si: H/a-SiGe: H heterojunctions have been prepared as the photoconductors in the liquid crystal light valves. The impedance matching conditions of the a-Si: H and the heterojunction in the valves...
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Article
Molecular Beam Epitaxy of Znl−x Cdx Se/ZnSe Heterostructures And Their Optical Properties
Superlattices and quantum wells of Znl−xCdxSe/ZnSe, and heterostructures based on ZnSe/CdSe digital alloys have been grown by molecular beam epitaxy (MBE). Their optical properties were studied with particular em...
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Article
Voltage reduction for photorefractive two-wave mixing in InP:Fe by optical gap control
We report a method to increase the photorefractive two-wave mixing gain coefficient Γ in semiconductors by using additional incident laser radiation. Two auxiliary beams are used to optimize the spatial distri...
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Article
Picosecond photorefractive diffraction in CdTe at 1 μm
Using a ps-transient grating technique the contribution of the ps-photorefractive effect to the first-order probe-beam diffraction signal has been studied in CdTe at 1 μm investigating diffraction kinetics at ...
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Article
Reactions of Titanium Films with thin Silicon Dioxide, Nitride, and Oxynitride Films During Rapid Thermal Annealing
The interactions of Ti with SiO2, Si3N4, and SiOiNy have been studied during rapid thermal annealing at 400 to 900 °C in Ar with 3% H2 ambient. X-ray diffraction, sheet resistance measurements, RBS, nuclear react...
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Article
Study of a-Si:H/μc-Si:H Heterojunction as Photosensor for Large Screen Projection Display
Liquid crystal light valve(LCLV) using an a-Si:H/μc-Si:H heterostructure as the photosensor and the nematic liquid crystal as the modulator has been firstly presented for large screen projection display. The a...
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Article
The Mbe Growth of Widegap II-VI Injection Lasers and LEDs
Striking progress in the development of II-VI semiconductor heterostructures, coupled with seminal advances in do**, has very recently led to the first demonstration of blue and blue/green diode lasers opera...
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Article
Investigation of Optimal Photosensor in A-SI:H Liquid Crystal Light Valves
The a-Si:H thin film is used for a photosensor in liquid crystal light valve(LCLV). A lumped element model for the layered a-Si:H LCLV is developed. It has been shown that the dark and photo-resistances of the...
