Now showing items 151-160 of 169
Design nanocrack patterns in heterogeneous films
(IOP Publishing Ltd, 2006-10-28)
Nanowires have significant potential in future technologies such as nanomechanical devices and electronics. Recent experiments suggest that nanowires with sub-100 nm diameters may be fabricated by filling cracks with various ...
The complex behavior of simple machines
(Elsevier, 1990-06)
This paper interprets work on understanding the actions of Turing machines operating on an initially blank tape. While this is impossible for arbitrary machines, complete characterizations of behavior are possible if the ...
Growth and properties of InAsxSb1-x, AlyGa1-ySb, and InAsxSb1-x/AlyGa1-ySb heterostructures
(Elsevier, 1991-05-02)
A series of undoped InSb and InAsxSb1-x layers were grown using tetramer Sb4 and As4 sources on (100)-oriented semi-insulating GaAs and InP substrates with different growth parameters. Very high electron mobilities (70,000 ...
Space-charge layers in semi-insulating GaAs: Photoexcited two-dimensional electron systems
(Elsevier, 1985)
Resonant Raman spectra of photoexcited semi-insulating GaAs and Fe/GaAs show features characteristic of two-dimensional electron plasmas. The results are ascribed to the presence of a space-charge layer at the surface, ...
Ultrahigh-bandwidth vector network analyzer based on external electro-optic sampling
(Elsevier, 1992-03)
We report the development of an ultrahigh-bandwidth vector network analyzer useful for small-signal characterization of high-speed semiconductor devices. It employs 100-fs optical pulses for making terahertz-bandwidth ...
Numerical performance of layer stripping algorithms for two-dimensional inverse scattering problems
(IOP Publishing Ltd, 1992-08-01)
Numerical results of implementing a two-dimensional layer stripping algorithm to solve the two-dimensional Schrodinger equation inverse potential problem are presented and discussed. This is the first exact (all multiple ...
A silicon micromachined microphone for fluid mechanics research
(IOP Publishing Ltd, 2002-11-01)
MEMS piezoresistive sound detectors have been fabricated using the dissolved wafer process for the first time. The sensors utilize stress compensated PECVD ultra-thin silicon-nitride/oxide membrane together with monocrystalline ...
Performance monitoring of the Geumdang Bridge using a dense network of high-resolution wireless sensors
(IOP Publishing Ltd, 2006-12-01)
As researchers continue to explore wireless sensors for use in structural monitoring systems, validation of field performance must be done using actual civil structures. In this study, a network of low-cost wireless sensors ...
Raman scattering from phonons and magnons in antiferromagnetic Fe3BO6
(Elsevier, 1984-04)
Raman scattering by phonons and by magnon pairs has been observed in Fe3BO6. Of the predicted 60 Raman-active modes, 39 have been identified and classified according to their symmetries. The two-magnon band shows a strong ...
Fabrication of beam structures with micro-scale cross-sections and meso-scale spans
(IOP Publishing Ltd, 2007-12-01)
To allow testing of micro-scale aerodynamics, a process was created to manufacture beam structures that combine spans of 1 cm with a cross-section of 5 µm by 100 µm. The structural considerations limiting the fabrication ...