135911643
Method of dry-etching evaluation using quantum dots
Abstract New dry-etch processes, such as low-power reactive-ion etching (RIE) and electron cyclotron resonance, offer very low levels of residual lattice damage. These levels are below the resolution limits of traditional characterisation methods like Raman, photoluminescence, Schottky diode, etc. We show that the single-electron charging of a quantum dot fabricated using dry etching offers a very sensitive method of damage detection. For SiCl 4 SiF 4 RIE of GaAs we find a defect density of around 1015 cm−3, which is at the level of the background impurity concentration in the as-grown material.
137236624
Quantum electron beam probe of sidewall dry-etch damage
Damage as a result of ion bombardment may occur both at top surfaces and at sidewalls. We propose a method of probing sidewall damage using coherent electron focusing. A collimated electron beam is reflected off an internal boundary formed by dry etching. Spectra measured in an applied magnetic field are influenced strongly by increased levels of etch damage. Monte Carlo simulations combined with experiments on multiple beams reveal the separate contributions of boundary roughness and inelastic electron scattering. Electrostatic calculations reveal a damage shadow beneath the sidewall.
45952050
Fourier-transform solution to the problem of steady-state transonic motion of a line load across the surface of an elastic half-space (the corrected Cole-Huth solution)
Abstract Considered in the present article is the problem of a line load load moving at a constant transonic speed across the surface of an elastic half-space. Solution of the problem is derived here using the method of Fourier transforms.
28993688
Effect of a Binary Symmetric Channel on the Synchronisations Recovery of Variable Length Codes
3714667
Stochastic approximations of perturbed Fredholm Volterra integro-differential equation arising in mathematical neurosciences
This paper extends the results of synaptically generated wave propagation through a network of connected excitatory neurons to a continuous model, defined by a Fredholm Volterra integro-differential equation (FVIDE), which includes memory effects of the past in the propagation. Stochastic approximation and numerical simulations are discussed.
15039379
From DFT to systems test-a model based cost optimisation tool
Long lasting systems like airplanes have a cost structure where the maintenance costs are larger than the purchasing costs. Testing is required, both for preventive maintenance as well as repair and a major source for cost. Previously we have analysed test and Design for Testability for digital systems, covering ASICs, boards and systems. Besides, the continuous development of technology requires cost models that can grow dynamically and, because we will never have all information, can work with incomplete data sets. In this paper we present a tool that is well suited for a wide range of applications. Previously developed cost models can be incorporated and new elements can be added to the model as needed. Due to the generic approach the tool allows modelling general systems. It is not bound to the digital domain, although it has a strong background there.
97577218
A study on the grinding of glass using electrolytic in-process dressing
Grinding of brittle materials such as glass is gaining importance due to the rapid developments in the areas of machining of storage devices, microlenses, and optical communication devices. Grinding of such glasses is difficult because grinding wheels wear out easily due to the hard and brittle nature of the materials being machined. Grinding wheels with fine abrasive size are required in order to achieve ductile mode grinding. Problems such as wheel loading and glazing can be encountered while grinding with fine abrasive wheels. Electrolytic in-process dressing (ELID) is an efficient method to dress the grinding wheel while performing grinding. In this paper, a fundamental study on the mechanism of the ELID grinding technique is discussed in detail. Several sets of experiments have been performed to determine the optimal grinding conditions. From the experiments, it has been established that surface roughness could be further improved if the current duty ratio to dress the grinding wheel were increased. The force patterns and the changes in the profile of the grinding wheel during machining are also presented and discussed in detail.