7,917 research outputs found

    Bell's Theorem from Moore's Theorem

    Full text link
    It is shown that the restrictions of what can be inferred from classically-recorded observational outcomes that are imposed by the no-cloning theorem, the Kochen-Specker theorem and Bell's theorem also follow from restrictions on inferences from observations formulated within classical automata theory. Similarities between the assumptions underlying classical automata theory and those underlying universally-unitary quantum theory are discussed.Comment: 12 pages; to appear in Int. J. General System

    Apollo telescope mount: A partial listing of scientific publications and presentations, supplement 3

    Get PDF
    Compilations of bibliographies from the principal investigator groups of the Skylab solar observatory facility that gathered data from May 28, 1973, to February 8, 1974 are presented. The analysis of these data is presently under way. The publications listed are divided into the following categories: (1) journal publications; (2) journal publications submitted; (3) other publications; (4) presentations-national and international meetings; and (5) other presentations

    Analytical Models for the Energetics of Cosmic Accretion Shocks, their Cosmological Evolution, and the Effect of Environment

    Get PDF
    We present an analytical description of the energetics of the population of cosmic accretion shocks, for a concordance cosmology. We calculate how the shock-processed accretion power and mass current are distributed among different shock Mach numbers, and how they evolve with cosmic time. We calculate the cumulative energy input of cosmic accretion shocks of any Mach number to the intergalactic medium as a function of redshift, and we compare it with the energy output of supernova explosions as well as with the energy input required to reionize the universe. In addition, we investigate and quantify the effect of environmental factors, such as local clustering properties and filament preheating on the statistical properties of these shocks. We find that the energy processed by accretion shocks is higher than the supernova energy output for z<3 and that it becomes more than an order of magnitude higher in the local universe. The energy processed by accretion shocks alone becomes comparable to the energy required to reionize the universe by z~3.5. Finally, we establish both qualitative and quantitatively that both local clustering as well as filament compression and preheating are important factors in determining the statistical properties of the cosmic accretion shock population.Comment: 13 pages, 5 figures, emulateap

    Two Archeological Surveys In The Texas Department Of Transportations Atlanta District: FM 450 At Little Cypress Bayou, Harrison County (CSJ 0843-02-012), And County Road 4114 At Brutons Creek, Morris County (CSJ 0919-20-030)

    Get PDF
    Prewitt and Associates, Inc., was contracted by the Texas Department of Transportation (TxDOT) to perform two intensive archeological surveys in TxDOT’s Atlanta District under Texas Antiquities Permit No. 6385. This work was completed prior to replacement of a bridge and realignment of approaches on Farm-to-Market Road (FM) 450 at Little Cypress Bayou in Harrison County (CSJ 0843-02-012) and replacement of a bridge and improvement of approaches on County Road 4114 at Brutons Creek in Morris County (CSJ 0919-20-030). The Area of Potential Effects (APE) for the FM 450 project is 50 acres and includes existing and new TxDOT right of way; approximately half of the APE was surveyed in 2010 (McKee 2010). The APE for the County Road 4114 project is 1.2 acres and includes a short segment of existing right of way and 0.9 acres of temporary construction easements. Prewitt and Associates archeologists surveyed the remaining 25 acres of the FM 450 APE and the County Road 4114 APE in December 2012 and January 2013. These investigations required a total of about 11 person-days of effort. The FM 450 survey included the excavation of 50 shovel tests and 11 trenches. This effort identified a small amount of modern trash on the upland margin at the north end of the project area and prehistoric site 41HS973 on the floodplain near Little Cypress Bayou. Site 41HS973 consists of a diffuse scatter of seven pieces of lithic debitage identified on two sandy rises on the Little Cypress Bayou floodplain. The investigation indicated that the archeological deposits in the investigated part of the site lack both integrity and significance. Thus, Prewitt and Associates recommends that the recorded portion of 41HS973 is not eligible for listing in the National Register of Historic Places under Criterion D (36 CFR 60.4; 36 CFR 800.4, 5) or designation as a State Archeological Landmark (13 TAC 26.2, 8). The County Road 4114 survey included the excavation of 15 shovel tests and 4 trenches in and adjacent to the temporary construction easements. No archeological materials or deposits were identified during this investigation. Both surveys were conducted under no artifact collection policies. Identified artifacts were noted, briefly described, and returned to the point of recovery

    Detection of solvents using a distributed fibre optic sensor

    Get PDF
    A fibre optic sensor that is capable of distributed detection of liquid solvents is presented. Sensor interrogation using optical time domain reflectometry (OTDR) provides the capability of locating solvent spills to a precision of ±2 m over a total sensor length that may extend to 20 km

    Unresolved Unidentified Source Contribution to the Gamma-ray Background

    Full text link
    The large majority of EGRET point sources remain without an identified low-energy counterpart, and a large fraction of these sources are most likely extragalactic. Whatever the nature of the extragalactic EGRET unidentified sources, faint unresolved objects of the same class must have a contribution to the diffuse extragalactic gamma-ray background (EGRB). Understanding this component of the EGRB, along with other guaranteed contributions from known sources, is essential if we are to use this emission to constrain exotic high-energy physics. Here, we follow an empirical approach to estimate whether a potential contribution of unidentified sources to the EGRB is likely to be important, and we find that it is. Additionally, we show how upcoming GLAST observations of EGRET unidentified sources, as well as of their fainter counterparts, can be combined with GLAST observations of the Galactic and extragalactic diffuse backgrounds to shed light on the nature of the EGRET unidentified sources even without any positional association of such sources with low-energy counterparts.Comment: 11 pages, 5 figures, submitted to Ap

    Metastable Charged Sparticles and the Cosmological Li7 Problem

    Full text link
    We consider the effects of metastable charged sparticles on Big-Bang Nucleosynthesis (BBN), including bound-state reaction rates and chemical effects. We make a new analysis of the bound states of negatively-charged massive particles with the light nuclei most prominent in BBN, and present a new code to track their abundances, paying particular attention to that of Li7. Assuming, as an example, that the gravitino is the lightest supersymmetric particle (LSP), and that the lighter stau slepton, stau_1, is the metastable next-to-lightest sparticle within the constrained minimal supersymmetric extension of the Standard Model (CMSSM), we analyze the possible effects on the standard BBN abundances of stau_1 bound states and decays for representative values of the gravitino mass. Taking into account the constraint on the CMSSM parameter space imposed by the discovery of the Higgs boson at the LHC, we delineate regions in which the fit to the measured light-element abundances is as good as in standard BBN. We also identify regions of the CMSSM parameter space in which the bound state properties, chemistry and decays of metastable charged sparticles can solve the cosmological Li7 problem.Comment: 49 pages, 29 eps figure
    • 

    corecore