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Now showing items 21-40 of 2693
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Abundance of elements beyond the iron group in cool do white dwarfs
(2005-09-10)We report the presence of elements beyond the iron group in the atmospheres of the cool DO white dwarfs HD 149499 B and HZ 21. Photospheric lines of germanium (Z = 32), arsenic (33), selenium (34), tin (50), tellurium (52), ... -
Abundances and energy spectra of corotating interaction region heavy ions observed during solar cycle 23
(2008-05-10)Using instruments on the ACE spacecraft, we surveyed the heavy-ion spectra and composition over the range He– Fe for 41 corotating interaction regions (CIRs) during 1998–2007. Below~ 1 MeV nucleon^-1 the spectra are power ... -
Abundances of heavy and ultraheavy ions in ³He-rich solar flares
(2004-05-01)We have surveyed ³He-rich solar energetic particle (SEP) events over the period 1997 September-2003 April in order to characterize abundances of heavy ions near 400 keV nucleonˉ¹. The first part of the study focuses on 20 ... -
Academic Integrity & Academic Dishonesty: A Handbook About Cheating & Plagiarism
(2011)Introduction By the year 2000, it was evident that two new specters were haunting the halls of academia: a proliferation of legitimate Internet sites (e.g. primary source texts) and illegitimate Internet sites (e.g. ... -
Acceleration of low-energy ions at parallel shocks with a focused transport model
(2013-04-10)We present a test particle simulation on the injection and acceleration of low-energy suprathermal particles by parallel shocks with a focused transport model. The focused transport equation contains all necessary physics ... -
Acceleration of suprathermal particles by compressional plasma wave trains in the solar wind
(2010-12-04)This paper presents a calculation of particle acceleration by an idealized compressional plasma wave train. In this model, suprathermal particles, such as pickup ions, are continuously injected into a wave train consisting ... -
Acceleration of ³He nuclei at interplanetary shocks
(2001-05-20)e have surveyed the 0.5-2.0 MeV nucleonˉ¹ ion composition of 56 interplanetary (IP) shocks observed with the Ultra - Low-Energy Isotope Spectrometer on board the Advanced Composition Explorer from 1997 October 1 through ... -
Acquisition of airborne imagery in support of Deepwater Horizon oil spill recovery assessments
(2012-10-19)Remote sensing imagery was collected from a low flying aircraft along the near coastal waters of the Florida Panhandle and northern Gulf of Mexico and into Barataria Bay, Louisiana, USA, during March 2011. Imagery was ... -
Activity coefficient and the Einstein relation
(1983-07-15)A connection between the activity coefficient of current carriers and the Einstein relations is established by two methods, one based on normal semiconductor concepts and one based on irreversible thermodynamics. The ... -
An Adaptive Distributed Data Aggregation based on RCPC for Wireless Sensor Networks
(2006-05-10)One of the most important design issues in wireless sensor networks is energy efficiency. Data aggregation has significant impact on the energy efficiency of the wireless sensor networks. With massive deployment of sensor ... -
Adaptive handoff algorithms based on self-organizing neural networks to enhance the quality of service of nonstationary traffic in hierarchical cellular networks
(2000-03-30)Third-generation (3G) wireless networks, based on a hierarchical cellular structure (HCS), support tiered levels of multimedia services. These services can be categorized as real-time and delay-sensitive, or non-real-time ... -
Adaptive threshold selection technique for denoising in dithered quantizers
(2001-03-26)We described an adaptive denoising method to improve image quality in a wavelet-based image compression process that uses dithered quantization. In our method, the second-order moment of the quantization noise is ... -
Adaptive weighing of context models for lossless data compression
(2005-12-21)Until recently the state of the art in lossless data compression was prediction by partial match (PPM). A PPM model estimates the next-symbol probability distribution by combining statistics from the longest matching ... -
Adrenal gland and lung lesions in Gulf of Mexico common bottlenose dolphins (Tursiops truncatus) found dead following the Deepwater Horizon oil spill
(2015-05-20)A northern Gulf of Mexico (GoM) cetacean unusual mortality event (UME) involving primarily bottlenose dolphins (Tursiops truncatus) in Louisiana, Mississippi, and Alabama began in February 2010 and continued into 2014. ... -
An Advanced context aware operator support system (CAOSS) for chemical plant operation
(2018-05)Analyzing potential causes for recent industrial accidents and production losses highlights that the majority of these incidents are due to human factor failure: operator error, poor decision-making and violations ... -
Advanced Discrete Halanay-Type Inequalities: Stability of Difference Equations
(2009-01-21)We derive new nonlinear discrete analogue of the continuous Halanay-type inequality. These inequalities can be used as basic tools in the study of the global asymptotic stability of the equilibrium of certain generalized ... -
Advancement of an optical remote sensing model to simulate the underwater light field
(1997-01-17)An analytical solution to the two-flow equations developed by Bostater, et al. is modified, and a sensitivity analysis is performed on the remote sensing model which contains both diffuse and specular light components. The ... -
Advances in In-Situ Calibration of Attitude and Doppler Sensors for Precision Oceanographic Submersible Navigation
(2005)This paper reviews the development and experimental evaluation of three techniques for estimating the alignment matrix of Doppler sonars, which are commonly used for precision navigation of oceanographic submersibles, ... -
Advances in In-Situ Calibration of Attitude and Doppler Sensors for Precision Oceanographic Submersible Navigation
(2005)This paper reviews the development and experimental evaluation of three techniques for estimating the alignment matrix of Doppler sonars, which are commonly used for precision navigation of oceanographic submersibles, ...