Christian Brown

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[1] In 2003–2005, systematic studies in four contrasting hydrogeologic settings were undertaken to improve understanding of source and transport controls on nitrate movement to public supply wells (PSW) in principal aquifers of the United States. Chemical, isotopic, and age tracer data show that agricultural fertilizers and urban septic leachate were the(More)
Scaling relationships between skeletal dimensions and body mass in extant birds are often used to estimate body mass in fossil crown-group birds, as well as in stem-group avialans. However, useful statistical measurements for constraining the precision and accuracy of fossil mass estimates are rarely provided, which prevents the quantification of robust(More)
With the recent appearance of netbooks and low-cost tablet PCs, a study was undertaken to explore their potential in the classroom and determine which of the two device types is more suitable in this setting. A collaborative learning activity based on these devices was implemented in 5 sessions of a graduate engineering course of 20 students, most of whom(More)
Recent work has called into question the reality of the rare male mating advantage, pointing out that it could be a statistical artifact of marking flies for behavioral observation or of experimental bias in collecting males. We designed an experiment to test for rare male mating advantage that avoids these sources of bias. Large numbers of males of three(More)
The subject of Non-Photorealistic Rendering (NPR) is one which tends towards a certain, small set of targeted appearances. Work in NPR-in particular in real-time graphics-is generally aimed at a classic cel-animated, "cartoon" visual style-that is, solid black outlines with clamped ramp shading. While this look is often arresting and interesting, it is a(More)
OBJECTIVES To evaluate how accurate a 12-core transrectal biopsy derived low-risk prostate cancer diagnosis is for an active surveillance programme by comparing the histological outcome with that from confirmatory transperineal sector biopsy. SUBJECTS AND METHODS The cohort included 166 men diagnosed with low volume Gleason score 3+3 prostate cancer on(More)
OBJECTIVE To document the learning curve for the laparoscopic radical prostatectomy (LRP) procedure and discuss the optimal usage of prospectively documented outcome data for reporting a surgeon's performance. MATERIALS AND METHODS Using prospectively collected data from the first series of patients to undergo LRP by two surgeons in the same institution,(More)
Neither CERF, nor any persons acting on behalf of either: a. Makes any warranty or representation, express or implied, with respect to the accuracy, completeness, or usefulness of the infortnation contained in this report, or that the use of any apparatus, method, or process disclosed in this report may not infringe third party rights; or b. Assumes any(More)
The author hereby grants to MIT permission to reproduce and distribute publicly paper and electronic copies of this thesis document in whole or in part in any medium now known or hereafter created. ABSTRACT Understanding intensity coding and auditory learning are basic concerns of research on the auditory central pathway. There is no unifying model of(More)