Tube-wave speed in the presence of a weakly anisotropic formation can be expressed in terms of an effective shear modulus for an equivalent isotropic formation. When combined with expressions for the speeds of the SHand quasi-SV-waves along the borehole axis, a simple inversion procedure can be obtained to determine three of the five elasticities of a transversely isotropic (TI) formation tilte...

A gas-phase, room-temperature, plasmaless isotropic etching system has been used for bulk and thin lm silicon etching. A computer controlled multi-chambered etcher is used to provide precisely metered pulses of xenon di uoride (XeF2) gas to the etch chamber. Etch rates as high as 15 microns per minute have been observed. The etch appears to have in nite selectivity to many common thin lms, incl...

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We present new optical and infrared photometry for a statistically complete sample of seven 1.1 mm selected sources with accurate coordinates. We determine photometric redshifts for four of the seven sources of 4.64, 4.54, 1.49 and 0.18. Of the other three sources two are undetected at optical wavelengths down to the limits of very deep Subaru and Canada-France-Hawaii Telescope images (∼27 mag ...

A number of workers have estimated surface tensions of solids from measurements of the differences in the lattice parameters of bulk crystals and microcrystals. The data are then analysed by an expression valid only for spherical. isotropic microcrystals. Real microcrystals are usually facetted, resulting in a number of possible problems which are discussed here. The main results given are : (i...

In this paper a method is proposed to fabricate channels for fluidic applications with a depth in the nanometer range. Channels with smooth and straight sidewalls are constructed with the help of micromachining technology by etching shallow trenches into 〈110〉 silicon using native oxide as a mask material and OPD resist developer as the etchant. Sub-50 nm deep fluidic channels are formed after ...

Point-like nature of stars leads to significant disturbances of light beams passed through the atmosphere by refractive effects. These effects should be taken into account in retrievals from stellar occultation measurements. We consider the influence of scintillation on stellar occultation measurements and on quality of ozone retrievals from these measurements, based on experience of the GOMOS ...

In this paper we present a deep and homogeneous i-band selected multi-waveband catalogue in the COSMOS field covering an area of about 0.7⊓⊔◦. Our catalogue with a formal 50% completeness limit for point sources of i ∼ 26.7 comprises about 290 000 galaxies with information in 8 passbands. We combine publicly available u, B, V, r, i, z, and K data with proprietary imaging in H band. We discuss i...

Gallium arsenide junction field-effect transistors (GaAs JFETs) can be made immune to carrier freeze-out, making such transistors useful for the readout of detector arrays that operate at 4 K. Typical applications require transistors with very low noise and extremely low leakage current. By using a recently developed etchant for GaAs that is highly isotropic, etched GaAs JFETs have fabricated t...

The fine architecture of skeletal muscle Z bands is considered in view of stereo electron microscopical evidence and current biochemical and immunological concepts, and a new Z-band model is proposed. This model is based on a looping, interlinking configuration, within the Z band, of strands which emanate from I-band (actin) filaments of adjacent sarcomeres. Two versions of the model seem prese...