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VXD3: The SLD Vertex Detector Upgrade Based on a 307 MPixel CCD System (open access)

VXD3: The SLD Vertex Detector Upgrade Based on a 307 MPixel CCD System

The SLD upgrade CCD vertex detector (VXD3) is described. Its 307 million pixels are assembled from 96 3.2 Mpixel CCDs of 13 cm{sup 2} each. The system has evolved from the pioneering CCD vertex detector VXD2, which has operated in SLD since 1992. The CCDs of VXD3 are mounted on beryllium ladders in three cylinders, providing three space point measurements along each track of about 5 microns resolution in all three co-ordinates. Significant improvements are achieved with VXD3 in impact parameter resolution (about a factor of two) and acceptance ({approximately}20%) through optimized geometry and reduced material. New readout electronics have been developed for this system.
Date: December 1995
Creator: Brau, James E.
Object Type: Article
System: The UNT Digital Library
The Theory of Essence. [Part] 2. An Electromagnetic-Quantum Mechanical Model of Interactionism (open access)

The Theory of Essence. [Part] 2. An Electromagnetic-Quantum Mechanical Model of Interactionism

Article discussing the theory of essence, based on the physics of electromagnetism and quantum mechanics, which solves the problem of interaction resulting from Descartes's dualistic conception of human nature. The theory is empirically based in phenomena consistently reported by near-death experiencers.
Date: Winter 1995
Creator: Arnette, J. Kenneth
Object Type: Article
System: The UNT Digital Library
National Institute for Global Environmental Change. Final Report (open access)

National Institute for Global Environmental Change. Final Report

Over the past decade or so the evolution and equilibria of persistent decks of stratocumulus climatologically clinging to the edge of summertime subtropical highs has been an issue of increased scientific inquiry. The particular interest in the microphysical structure of these clouds stems from a variety of hypotheses which suggest that anthropogenic influences or biogenic feedbacks may alter the structure of these clouds in a manner which may be climatically significant. Most hypotheses regarding boundary layer influences on climate have been formulated by an examination of the solution space of simple models. The earliest hypothesis of this sort (and the one on the most solid footing) is due to Twomey (1974), who posited that enhanced concentrations of CCN could lead to enhanced droplet reflectivity and enhanced albedos in clouds of modest optical depths. In low lying clouds where the albedo effect dominates, the climate sensitivity to a robust perturbation in cloud albedo may be significant. One of the primary objectives of this current research has been to explore the hypothesis of Twomey. The basic approach was to couple radiative calculations with detailed representations of the droplet spectra. The detailed representation of the droplet spectra was generated by the Large Eddy …
Date: March 9, 1995
Creator: Cotton, W.R.; Stevens, B.; Duda, D.; Richardson, W. & Feingold, G.
Object Type: Report
System: The UNT Digital Library
The production of {pi}{sup {+-}}, K{sup {+-}}, p, k{sup 0} and {Lambda}{sup 0} in hadronic Z{sup 0} decays (open access)

The production of {pi}{sup {+-}}, K{sup {+-}}, p, k{sup 0} and {Lambda}{sup 0} in hadronic Z{sup 0} decays

The authors have measured production fractions and spectra for {pi}{sup {+-}}, K{sup {+-}} and p, and production spectra for K{sup 0} and {Lambda}{sup 0} in both hadronic Z{sup 0} decays and a Z{sup 0} {yields} light quark (uds) subset at SLD. The SLD Cherenkov Ring Imaging Detector was used to identify charged hadrons. The CCD vertex detector was used to select the enriched uds sample. For the global sample, the results are consistent with previous experiments. The authors observe a clear flavor dependence in production spectra, but only a small effect in hadron fractions and {xi} = ln(1/x{sub p}) peak positions.
Date: August 1, 1995
Creator: Baird, K.
Object Type: Article
System: The UNT Digital Library