Trent D. Ridder, Benjamin J. Ver Steeg, Bentley D. Laaksonen, "Comparison of spectroscopically measured tissue alcohol concentration to blood and breath alcohol measurements," 2009, Journal of Journal of Biomedical Optics, 14(5), (2009).
Alcohol testing is an expanding area of interest due to the impacts of alcohol abuse that extend well beyond drunk driving. However, existing approaches such as blood and urine assays are hampered in some testing environments by biohazard risks. A noninvasive, in vivo spectroscopic technique offers a promising alternative, as no body fluids are required. The purpose of this work is to report the results of a 36-subject clinical study designed to characterize tissue alcohol measured using near-infrared spectroscopy relative to venous blood, capillary blood, and breath alcohol. Comparison of blood and breath alcohol concentrations demonstrated significant differences in alcohol concentration [root mean square of 9.0 to 13.5 mg/dL] that were attributable to both assay accuracy and precision as well as alcohol pharmacokinetics. A first-order kinetic model was used to estimate the contribution of alcohol pharmacokinetics to the differences in concentration observed between the blood, breath, and tissue assays. All pair-wise combinations of alcohol assays were investigated, and the fraction of the alcohol concentration variance explained by pharmacokinetics ranged from 41.0% to 83.5%. Accounting for pharmacokinetic concentration differences, the accuracy and precision of the spectroscopic tissue assay were found to be comparable to those of the blood and breath assays.
Anita Krishnamurthi, D. M. Terndrup, M. H. Pinsonneault, K. Sellgren, John R. Stauffer, Rudolph Schild, D. E. Backman, K. B. Beisser, D. B.Dahari, A.Dasgupta, J. T. Hagelgans, M. A. Seeds, Rajan Anand, Bentley D. Laaksonen, Laurence A. Marschall, T. Ramseyer, "New Rotation Periods in the Pleiades: Interpreting Activity Indicators," The Astrophysical Journal, 493, pp. 914-925, (1998).
We present results of photometric monitoring campaigns of G, K, and M dwarfs in the Pleiades carried out in 1994-1996. We have determined rotation periods for 18 stars in this cluster. In this paper we examine the validity of using observables such as X-ray activity and the amplitude of photometric variations as indicators of angular momentum loss. We report the discovery of cool, slow rotators with high amplitudes of variation. This contradicts previous conclusions about the use of amplitudes as an alternate diagnostic of the saturation of angular momentum loss. We show that the X-ray data can be used as observational indicators of mass-dependent saturation in the angular momentum loss proposed on theoretical grounds.
S. Allain, J. Bouvier, C. Prosser, L. A. Marschall, B. D. Laaksonen, "Rotational periods and starspot activity of young solar-type dwarfs in the open cluster IC4665," Astronomy and Astrophysics, 305, pp. 498-506, (1996).
We present the results of a V-band photometric monitoring survey of 15 late-type dwarfs in the young open cluster IC 4665. Low-amplitude periodic light variations are found for 8 stars and ascribed to the modulation by starspots that cover typically a few percent of the stellar disk. Periods range from 0.6 to 3.7d, translating to equatorial velocities between 13 and 93km/s. That no period longer than 4d was detected suggests a relative paucity of extremely slow rotators (V_eq_<<10km/s) among late-type dwarfs in IC4665. The fractional number of slow rotators in IC 4665 is similar to that of Alpha Per cluster, suggesting that IC 4665 is close in age to Alpha Per (~50Myr).
Geoffrey S. Burks, Paul Clark, Bentley D. Laaksonen, "Astronomy in Cyberspace, an Experiment: the Online Journal of Astronomy Education," American Astronomical Society Meeting, 187, #05.01, (1995).
The Online Journal of Astronomy Education has been formed as an experiment whose aim is to fill in a need for information exchange in astronomy education. There is a lack of forums for the publication of innovative astronomy teaching techniques. With this journal, we hope to meet the needs of the astronomy teaching community. The Online Journal of Astronomy Education (OJAE) is made up of three main parts: 1. The Main Journal, a peer reviewed journal. 2. The Forum, an open section for those who want to make contributions and ask questions, without having to deal with the peer review process. And 3. Other Astronomy Resources, pointers to other astronomy sources. The journal is in hypertext format and is availible over the world wide web. Submissions to the main journal are accepted in plain text and html format. Submissions to the forum are accepted in plain text, html format, and postscript format. The address of OJAE is: http://artsci.tvi.cc.nm.us/OJAE .
Michael W. Richmond, Richard R. Treffers, Alexei V. Filippenko, Schuyler D. van Dyk, Young Paik, Chien Peng, Laurence A. Marschall, Bentley D.Laaksonen, Bruce Macintosh, Ian S. McLean, "UBVRI Photometry of the Type Ia SN 1994D in NGC 4526," The Astrophysical Journal, 109(5), pp. 2121-33, (1995).
We present optical photometry for the type Ia SN 1994D in NGC 4526 from 1994 March 7 to June 4 starting 13 days before B-band maximum. The light curves of this SN resemble closely those of the "normal" type Ia events SNe 1989B and 1980N, differing only in a slightly faster decline after maximum in VRI. The optical absolute magnitudes of SN 1994D, however, are significantly brighter than those of its near twins, and brighter than those predicted by Phillips [ApJ, 413, L105 (1993)] relationship between decline rate and luminosity. Our small amount of IR photometry of SN 1994D is not inconsistent with that of other type Ia SNe.
Charles F. Prosser, Matthew D. Shetrone, Amil Dasgupta, Dana E. Backman, Bentley D. Laaksonen, Shawn W. Baker, Laurence A. Marschall, Barbara A. Whitney, Konrad Kuijken, John R. Stauffer, "Rotation Periods of Open-Cluster Stars. III.," Publications of the Astronomical Society of the Pacific, 107(709), pp. 211-18, (1995).
We present the results from a photometric monitoring program of 15 open cluster stars and one weak-lined T Tauri star during late 1993/early 1994. Several show rotators which are members of the Alpha Persei, Pleiades, and Hyades open clusters have been monitored and period estimates derived. Using all available Pleiades stars with photometric periods together with current X-ray flux measurements, we illustrate the X-ray activity/rotation relation among Pleiades late-G/K dwarfs. The data show a clear break in the rotation-activity relation around P approximately 6-7 days -- in general accordance with previous results using more heterogeneous samples of G/K stars.
B. Laaksonen, W. Romanishin, L. Marschall, "BVRI Photometry of supernovae 1993G, 1994D, 1994I, 1994M, 1994S, and 1994Q," American Astronomical Society Meeting, 185, #79.13, (1995).
Using a 512 x 512 Photometrics CCD camera on the 31" telescope operated by the National Undergraduate Research Observatory in Flagstaff, Arizona, we have obtained B,V,R,and I frames of several recent supernovae, most of them observed near peak brightness. The most extensive of these observations, of SN1994D, cover 15 days in March and April, 1994, while the other supernovae, 1993G, 1994I, 1994M, 1994S, and 1994Q, are only sparsely sampled. We present light curves of SN 1994D, along with tables of all the observed magnitudes. We also discuss several alternative procedures used to minimize contamination from the background galaxies and we outline the methods used to reduce our instrumental magnitudes to the standard system. This work was supported by grants from the National Science Foundation RUE program, the NASA Space Grant program, and Gettsyburg College. We acknowledge the support of Lowell Observatory for the use of the 31" telescope on Anderson Mesa by students and faculty of NURO.
Charles F. Prosser, Matthew D. Shetrone, Ettore Marilli, Santo Catalano, Scott D. Williams, Dana E. Backman, Bentley D. Laaksonen, Vikram Adige, Laurence A. Marschall, John R. Stauffer, "Rotation Periods of Open-Cluster Stars. II.," Publications of the Astronomical Society of the Pacific, 105(694), pp. 1407-14, (1993).
We present the results from a photometric monitoring program of 21 stars observed during 1992 in the Pleiades and Alpha Persei open clusters. Period determinations for 16 stars are given, 13 of which are the first periods reported for these stars. Brightness variations for an additional five cluster stars are also given. One K dwarf member of the alpha Per cluster is observed to have a period of rotation of only 4.39 hr. perhaps the shortest period currently known among BY Draconis variables. The individual photometric measurements have been deposited with the NSSDC. Combining current X-ray flux determinations with known photometric periods, we illustrate the X-ray activity/rotation relation among Pleiades K dwarfs based on available data.
Laaksonen, Bentley D., Color image of NGC 3627, CCD Astronomy, Spring 1995, 2(1), 44.
Laaksonen, Bentley D., Color image of NGC 3486, CCD Astronomy, Summer 1995, 2(2), 45.
Laaksonen, Bentley D., Color image of the Crab Nebula & SN 1994D, CCD Astronomy, Spring 1994, 1(2), 27.
|Computer Science (Master of Science)|
|A||Introduction to Computing (103)||1991||Gettysburg College|
|A+||Introduction to Computer Science (104)||1992||Gettysburg College|
|A||Computer Organization & Assembly Language Programming (221)||1992||Gettysburg College|
|A-||Data Structures (216)||1993||Gettysburg College|
|A+||Introduction to Artificial Intelligence (371)||1993||Gettysburg College|
|A-||Software Engineering (335)||1994||Gettysburg College|
|A||Software Systems and Design (340)||1995||Gettysburg College|
|A||Selected Topics (Software Development Project) (392)||1995||Gettysburg College|
|A||UNIX Administration and Tools (484)||1996||University of New Mexico|
|A||Geometric and Probabilistic Methods in Computer Science (530)||2009||University of New Mexico|
|A||Digital Image Processing (522)||2010||University of New Mexico|
|A||Computer Networks (585)||2010||University of New Mexico|
|A-||Advanced Operating Systems (587)||2010||University of New Mexico|
|A||Computer Vision (532)||2011||University of New Mexico|
|CR||Colloquium 1 (592)||2011||University of New Mexico|
|A||Numerical Analysis: Approximation and Differential Equations (576)||2011||University of New Mexico|
|A+||Fundamentals of Software Testing (581)||2012||University of New Mexico|
|CR||Colloquium 2 (592)||2012||University of New Mexico|
|A||Intro to AI (527)||2013||University of New Mexico|
|A+||Software Foundations (558)||2016||University of New Mexico|
|A+||Introduction to Cybersecurity (544)||2017||University of New Mexico|
|Physics (Bachelor of Science with honors)|
|A||Mechanics & Heat (111)||1991||Gettysburg College|
|A+||Waves, Electricity, & Magnetism (112)||1992||Gettysburg College|
|A-||Electronics w/ Lab (240)||1992||Gettysburg College|
|B+||Relativity & Modern Physics w/ Lab (213)||1993||Gettysburg College|
|B+||Classical Mechanics (319)||1993||Gettysburg College|
|A-||Atomic & Nuclear Physics w/ Lab (310)||1993||Gettysburg College|
|A+||Individualized Study-Research (Astrophysics) (462)||1994||Gettysburg College|
|A||Advanced Physics Laboratory (325)||1994||Gettysburg College|
|A||Quantum Mechanics (341)||1994||Gettysburg College|
|B||Special Topics in Physics (381)||1994||Gettysburg College|
|A||Summer Internship (Astrophysics) (474)||1994||Northern Arizona University|
|A-||Electricity & Magnetism (330)||1995||Gettysburg College|
|A||Concepts of Astronomy (421)||1995||University of New Mexico|
|CR||Seminar 1 (400)||1995||University of New Mexico|
|B||Classical Mechanics I (503)||1995||University of New Mexico|
|CR||Physics Problems Course (400)||1995||University of New Mexico|
|A+||Stars & Stellar Systems (422)||1996||University of New Mexico|
|CR||Seminar 2 (400)||1996||University of New Mexico|
|A+||Calculus I (111)||1991||Gettysburg College|
|A+||Calculus II (112)||1992||Gettysburg College|
|A||Multivariate Calculus (211)||1992||Gettysburg College|
|A||Linear Algebra (212)||1993||Gettysburg College|
|A||Differential Equations & Special Functions (363)||1993||Gettysburg College|
|A||Discrete Structures (208)||1994||Gettysburg College|
|A-||Mathematical Methods for Scientists & Engineers (466)||1996||University of New Mexico|
|Electrical & Computer Engineering|
|A||Signals and Communications (314)||1998||University of New Mexico|
|A+||Probabilistic Methods (340)||1998||University of New Mexico|
|A||Modern Dance I (110)||1996||University of New Mexico|
|CR||Modern Dance I (110)||1997||University of New Mexico|
|A||Hip-Hop Dance I (308)||1997||University of New Mexico|
|A-||African Dance I (308)||1997||University of New Mexico|
|A||Mexican Folk (308)||1998||University of New Mexico|
|A||Flamenco I (169)||1998||University of New Mexico|
|A||Flamenco I (169)||1999||University of New Mexico|
|A-||Hip-Hop Dance I (308)||1999||University of New Mexico|
|Physical Education, Non-Professional|
|A+||Ballroom I (124)||1999||University of New Mexico|
|A+||Aerobic Dance I (158)||1999||University of New Mexico|
|A+||Aerobic Dance II (159)||1999||University of New Mexico|
|A||Aerobic Dance II (159)||2000||University of New Mexico|
|A||Beginning Country Western Dance (128)||2000||University of New Mexico|
|A||Intermediate Country Western Dance (129)||2000||University of New Mexico|
|CR||Intermediate Ballroom Dance (125)||2001||University of New Mexico|
|CR||Beginning Country Western Dance (128)||2001||University of New Mexico|
|CR||Intermediate Country Western Dance (129)||2001||University of New Mexico|
|CR||Individual Tumbling (118)||2003||University of New Mexico|
|CR||Ballroom Dance I (124)||2004||University of New Mexico|
|CR||Beginning Tennis (143)||2004||University of New Mexico|
|A||Intermediate Tennis (144)||2006||University of New Mexico|
|A||English Composition (101)||1991||Gettysburg College|
|A||Colloquy (English/Writing) (100)||1992||Gettysburg College|
|B+||Fundamental Spanish (104)||1992||Gettysburg College|
|A||Intermediate Spanish (201)||1992||Gettysburg College|
|B+||Theory of Visual Arts (120)||1992||Gettysburg College|
|B||Intermediate Spanish (202)||1993||Gettysburg College|
|A||Introduction to Philosophy (101)||1993||Gettysburg College|
|A||Literary Foundations of Western Culture (103)||1994||Gettysburg College|
|A-||Religions of Japan (249)||1994||Gettysburg College|
|A||World Prehistory and Human Evolution (105)||1995||Gettysburg College|
|A||Greek Religion and Literature (315)||1999||University of New Mexico|
|A||Greek Mythology (411)||1999||University of New Mexico|
|A||Economics Personal Investing (212)||2002||University of New Mexico|
|A||Psychology of Alcoholism (430)||2007||University of New Mexico|
|A+||Human Geography (102)||2008||University of New Mexico|
|A+||Physical Geography (101)||2009||University of New Mexico|
|Spain||1990||Herndon High School|
|Greece||1999||University of New Mexico|
|United Kingdom: England, Scotland, Northern Ireland||2000||Independent|
|West Africa: Senegal, Gambia||2001||Mussukeba Sane Research Tours|