B. Haynes Lee

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This study investigates the droplet formation characteristics of secondary organic aerosol (SOA) formed during the ozonolysis of sesquiterpene β-caryophyllene (with and without hydroxyl radicals present). Emphasis is placed on understanding the role of semi-volatile material on Cloud Condensation Nucleus (CCN) activity and droplet 5 growth kinetics. Aging(More)
Secondary organic aerosol (SOA) consists of compounds with a wide range of volatilities and its ambient concentration is sensitive to this volatility distribution. Recent field studies have shown that the typical mass spectrum of ambient oxygenated organic aerosol (OOA) as measured by the Aerodyne Aerosol Mass Spectrometer (AMS) is quite different from the(More)
Emitter localization, using different types of sensors and integrating their output properly can potentially increase localization accuracy. It is relatively easy to measure the received signal strength (RSS), but RSS localization is generally less accurate than angle-of-arrival (AOA) localization in most practical environments. When both RSS and AOA are(More)
The time-of-arrival (TOA) estimation of pulse signals is widely used in radar, sonar and other sensor systems for geo-locating targets. This paper presents a new estimator for the TOA and width (W) of a pulse. Three auto-convolutions of a full and partial pulse determine the location of three convolution peaks. These peak locations are given by linear(More)
Formic acid (HCOOH) is one of the most abundant acids in the atmosphere, with an important influence on precipitation chemistry and acidity. Here we employ a chemical transport model (GEOS-Chem CTM) to interpret recent airborne and ground-based measurements over the US Southeast in terms of the constraints they provide on HCOOH sources and sinks. Summertime(More)
Received Signal Strength (RSS) measurements obtained at locations in the vicinity of an emitter can be used to estimate the emitter location given a suitable path loss model. For commonly used propagation models, the RSS has a dependence on the emitter to sensor separation, d, of the form P &#x221D; d<sup>&#x2212;&#x03B1;</sup>, where the path loss(More)
Received Signal Strength (RSS) localization has the advantage of simplicity over common schemes that use angle-of-arrival, time-of-arrival, and time-difference-of-arrival information. Signal power is relatively easy to measure with low cost and light weight equipment. The RSS at a receiver is a function of distance between an emitter and receiver, the(More)
The estimation of the symbol rate (or symbol duration Ts) of a symbol sequence in noise has important applications in symbol timing recovery and radio surveillance. Since a symbol sequence has spectral peaks at intervals 1/T<inf>s</inf>, T<inf>s</inf> estimation centers mostly on the establishment of spectral rate lines from the sequence. Examples include(More)
Air platforms can localize an emitter in 3-dimensions, by measuring the incident signal's angle-of-arrival (AOA). The resulting localization equations are nonlinear, since they contain arctangent functions of azimuth and elevation and can be computationally complex to solve. By assuming small AOA measurement errors, this paper provides a linear formulation,(More)
In many applications such as localization, there is a need to determine the unknown time shift D between a signal, and its time shifted version. Aligning one against the other until the two match will find D. When working with compressive sensing (CS) measurements, only linearly transformed samples of the signal and its time-shifted version are available.(More)