نتایج جستجو برای: scintillation index
تعداد نتایج: 401329 فیلتر نتایج به سال:
Power-law spectra have been used to interpret scintillation data for decades. Twocomponent power-law spectra were invoked to explain observed equatorial scintillation from VHF to S-Band. Carrano and Rino developed new strong-scatter theoretical results described in a companion IES 2015 paper. The new theoretical results have been used to estimate two-component power-law parameters from multi-fr...
Performance of several carrier tracking loops are evaluated by the wideband data that mimic the real ionospheric scintillation. To accommodate the deficiency of the receiver’s oscillator, six-state dynamic model driven by Gaussian-distributed random samples is used to simulate the phase noise inherited by the imperfect crystal unit. Ionospheric scintillation is associated with the deep power fa...
This study undertook to correlate lymphocyte transformation to human dental plaque antigens with clinical estimates of periodontal disease. Forty-eight patients with periodontal conditions ranging from normal gingivae to severe periodontitis were examined clinically. Oral cleanliness was determined by the Plaque Index System (Sflness & Loe 1964) and gingival health was assessed using the criter...
We describe the design, construction and performance of the upgraded DØ muon system for Run II of the Fermilab Tevatron collider. Significant improvements have been made to the major subsystems of the DØ muon detector: trigger scintillation counters, tracking detectors, and electronics. The Run II central muon detector has a new scintillation counter system inside the iron toroid and an improve...
This paper concerns the asymptotic structure of the scintillation function in the simplified setting of wave propagation modeled by an Itô-Schrödinger equation. We show that the size of the scintillation function crucially depends on the smoothness of the initial conditions for the wave equation and on the size of the “array of detectors” where the wave fields are measured. In many practical se...
INTRODUCTION Low-level radioactive waste is the primary component of the toxic waste stream generated from biomedical research and patient care activities. Historically, this radioactive waste has been shipped to Richland, Washington for landfill disposal. Several years ago, the Nuclear Regulatory Commission "deregulated" liquid scintillation vials containing tritium and carbon 14. More recentl...
A wave-front control paradigm based on gradient-flow optimization is analyzed. In adaptive systems with gradient-flow dynamics, the output of the wave-front sensor is used to directly control high-resolution wavefront correctors without the need for wave-front phase reconstruction (direct-control systems). Here, adaptive direct-control systems with advanced phase-contrast wave-front sensors are...
The scintillating grid is a recently discovered visual illusion, created by superimposing white discs on the intersections of orthogonal gray bars on a black background. Even though the entire display is stationary, observers perceive dark spots appearing and disappearing rapidly within some of the white discs. This scintillation effect is correlated with eye position and eye movements. Here we...
This chapter introduces an application case of self-organizing feature map (SOFM) on event processing of Positron Emission Tomagraph (PET) detector. The Siemens Inveon Dedicated PET scanner uses an array of 64 20x20 segmented LSO detectors in a tomographic arrangement to allow PET imaging of small animals. A detector consists of 20x20 LSO crystal pixels coupled to a Position Sensitive Photomult...
Two major performance degrading factors in free space optical communication systems are rainfall and atmospheric turbulence. We study the outage probability and bit-error rate for free-space communication links with spatial diversity and Gaussian-Schell electromagnetism beams over the raining turbulence fading channels by double inverse Gaussian distribution proposed in this paper. Assuming int...
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