885 research outputs found
Advanced modulation technology development for earth station demodulator applications
The purpose of this contract was to develop a high rate (200 Mbps), bandwidth efficient, modulation format using low cost hardware, in 1990's technology. The modulation format chosen is 16-ary continuous phase frequency shift keying (CPFSK). The implementation of the modulation format uses a unique combination of a limiter/discriminator followed by an accumulator to determine transmitted phase. An important feature of the modulation scheme is the way coding is applied to efficiently gain back the performance lost by the close spacing of the phase points
White Paper: Measuring the Neutrino Mass Hierarchy
This white paper is a condensation of a report by a committee appointed
jointly by the Nuclear Science and Physics Divisions at Lawrence Berkeley
National Laboratory (LBNL). The goal of this study was to identify the most
promising technique(s) for resolving the neutrino mass hierarchy. For the most
part, we have relied on calculations and simulations presented by the
proponents of the various experiments. We have included evaluations of the
opportunities and challenges for these experiments based on what is available
already in the literature.Comment: White paper prepared for Snowmass-201
Measurement of proton light yield of water-based liquid scintillator
The proton light yield of liquid scintillators is an important property in
the context of their use in large-scale neutrino experiments, with direct
implications for neutrino-proton scattering measurements and the discrimination
of fast neutrons from inverse beta-decay coincidence signals. This work
presents the first measurement of the proton light yield of a water-based
liquid scintillator (WbLS) formulated from 5% linear alkyl benzene (LAB), at
energies below 20 MeV, as well as a measurement of the proton light yield of a
pure LAB + 2 g/L 2,5-diphenyloxazole (PPO) mixture (LABPPO). The measurements
were performed using a double time-of-flight method and a pulsed neutron beam
from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The proton
light yields were measured relative to that of a 477 keV electron. The relative
proton light yield of WbLS was approximately 3.8% lower than that of LABPPO,
itself exhibiting a relative proton light yield higher than previous
measurements of an analogous anoxic sample. The observed quenching is not
compatible with the Birks model for either material, but is well described with
the addition of Chou's bimolecular quenching term.Comment: 14 pages, 11 figure
Model-based reasoning for power system management using KATE and the SSM/PMAD
The overall goal of this research effort has been the development of a software system which automates tasks related to monitoring and controlling electrical power distribution in spacecraft electrical power systems. The resulting software system is called the Intelligent Power Controller (IPC). The specific tasks performed by the IPC include continuous monitoring of the flow of power from a source to a set of loads, fast detection of anomalous behavior indicating a fault to one of the components of the distribution systems, generation of diagnosis (explanation) of anomalous behavior, isolation of faulty object from remainder of system, and maintenance of flow of power to critical loads and systems (e.g. life-support) despite fault conditions being present (recovery). The IPC system has evolved out of KATE (Knowledge-based Autonomous Test Engineer), developed at NASA-KSC. KATE consists of a set of software tools for developing and applying structure and behavior models to monitoring, diagnostic, and control applications
Measurement of Proton Light Yield of Water-based Liquid Scintillator
The proton light yield of liquid scintillators is an important property in the context of their use in large-scale neutrino experiments, with direct implications for neutrino-proton scattering measurements and the discrimination of fast neutrons from inverse β-decay coincidence signals. This work presents the first measurement of the proton light yield of a water-based liquid scintillator (WbLS) formulated from 5% linear alkyl benzene (LAB), at energies below 20 MeV, as well as a measurement of the proton light yield of a pure LAB + 2 g/L 2,5-diphenyloxazole (PPO) mixture (LABPPO). The measurements were performed using a double time-of-flight method and a pulsed neutron beam from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The proton light yields were measured relative to that of a 477 keV electron. The relative proton light yield of WbLS was approximately 3.8% lower than that of LABPPO, itself exhibiting a relative proton light yield 15–20% higher than previous measurements of an analogous anoxic sample. The observed quenching is not compatible with the Birks model for either material, but is well described with the addition of Chou’s bimolecular quenching term. © 2023, The Author(s)
Dynamic-Angle Spinning Without Sidebands
Abstract By means of rotor synchronized π-pulses, it is possible to eliminate the spinning sidebands that usually arise in dynamic-angle spinning (DAS). The theory of this approach, dynamic-angle hopping (DAH) is described and illustrated by means of experimental results. A magic-angle hopping (MAH) version of the experiment is also possible and can be used in a two-dimensional experiment with a hop of the spinner axis to produce sideband-free isotropic-anisotropic correlation spectra for spin-1/2 nuclei
Statistical Communication Theory
Contains reports on eleven research projects.National Institutes of Health (Grant MH-04737-03)National Science Foundation (Grant G-16526)National Aeronautics and Space Administration (Grant NsG-496
Society of Behavior Medicine (SBM) Urges Congress to Ensure Affordable Care Act Coverage of Prostate Cancer Screening Support Services for High-Risk Men
© Society of Behavioral Medicine 2019. All rights reserved. For permissions, please e-mail: [email protected]. Prostate cancer (PCa) disproportionately affects African American men. Early detection reduces risk of mortality. The United States Preventive Services Task Force (USPSTF) issued an updated recommendation statement on serum Prostate Specific Antigen (PSA)-based screening for PCa. Specifically, in 2012, the USPSTF recommended against PSA-based screening due to risk for overdiagnosis and overtreatment. However, the updated 2018 guidelines recommend consideration of screening for certain at risk men and revised the recommendation rating from D to C. This new guideline recommends providers to educate high-risk men on the benefits and harms of PSA-based PCa screening so that they can make an informed decision. The Affordable Care Act (ACA) includes provisions of service coverage for patient navigators who can help patients decide whether screening is appropriate, given potential risks and benefits, and training of health care providers in shared-decision regarding screening/treatment. These services can be utilized to support health care providers to better adhere to the new guideline. However, recommendations that are given a C rating or lower are not consistently reimbursed through many plans, including those offered through the ACA marketplace. The Society of Behavioral Medicine (SBM) supports the USPSTF guideline for the consideration of prostate cancer screening for high-risk men between the ages of 55 and 69. SBM encourages policymakers to include provisions for coverage of patient navigation services in the ACA to facilitate shared decision-making between providers and patients regarding screening
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