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Articles 1 - 9 of 9
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Linear-Strip Photographs Using Cirkut And Hulcher Cameras, Andrew Davidhazy
Linear-Strip Photographs Using Cirkut And Hulcher Cameras, Andrew Davidhazy
Articles
This article describes the process by which cameras originally designed for use as rotating, 360 degree coverage, panoramic cameras can be used for applications such as photographing the full length of a passing train or the facades of all the buildings along a street.
Peripheral Imaging With Electronic Memory Unit, Andrew Davidhazy
Peripheral Imaging With Electronic Memory Unit, Andrew Davidhazy
Articles
Description of how a Colorado Video 593 peak store instrument is applied to making 360 degree roll-out images of the surface of cylindrical subjects.
Ccd Speckle Observations Of Binary Stars From The Southern Hemisphere, Elliott P. Horch, Zoran Ninkov, Robert W. Slawson
Ccd Speckle Observations Of Binary Stars From The Southern Hemisphere, Elliott P. Horch, Zoran Ninkov, Robert W. Slawson
Articles
We present 119 position angle and separation measures of 86 double stars observed by way of speckle interferometry with the University of Toronto Southern Observatory 60 cm telescope at Las Campanas, Chile. Speckle interferograms are recorded with a bare (unintensified) front-illuminated CCD in a fast subarray-readout mode. Position angles and separations are determined by a weighted least-squares fitting algorithm applied to the binary power spectra, and the 180-degree ambiguity in the position angle inherent in this approach is resolved by bispectral analysis. In this configuration the 60 cm telescope exhibits near-diffraction-limited performance. Initial results indicate that our separation measures have …
Schlieren Photography Principles, Andrew Davidhazy
Schlieren Photography Principles, Andrew Davidhazy
Articles
This text went along with a demo which you will have to imagine!||"Schlieren Photography Principles" was a handout provided by Andrew Davidhazy at "Optical Diagnostics and Imaging Metrology: Ultrahigh- and high-speed photography and image-based motion measurement." Proceedings of SPIE--International Society for Optical Engineering, Conference 3173A. Held in San Diego, California: 27 July - 1 August 1997 (30 July 1997). Describes the theory of Schlieren imaging for flow visualization.
Evidence For The Specific Status Of The Honduran Lizards Formerly Referred To Ctenosaura Palearis (Reptilia: Squamata: Iguanidae), Larry Buckley, Ralph Axtell
Evidence For The Specific Status Of The Honduran Lizards Formerly Referred To Ctenosaura Palearis (Reptilia: Squamata: Iguanidae), Larry Buckley, Ralph Axtell
Articles
Ctenosaura melanosterna, a new species of spiny-tailed iguana, is described from the Aguan Valley and the Cayos Cochinos in Honduras. Its closest phylogenetic affinities are with C. palearis from the Motagua Valley in Guatemala with which it has previously been considered conspecific. Previous work on relationships within Ctenosaura presented evidence of a clade consisting of C. palearis (including the species described herein), C. bakeri, and C. oedirhina (de Queiroz, 1987a, 1987b; Kohler, 1995c). Data presented here adds additional support for this clade. Alternative biogeographic scenarios are discussed, with the conclusion that the current range of these species of Ctenosaura in …
A Multibandwidth Probing Method For Tissue Scattering Microstructure Characterization, Navalgund Rao, Maria Helguera
A Multibandwidth Probing Method For Tissue Scattering Microstructure Characterization, Navalgund Rao, Maria Helguera
Articles
In medical ultrasound the normalized second intensity moments of the echo signal can depend on the imaging system resolution cell volume (axial and lateral resolution) in addiction to the scattering microstructure. The authors propose a multibandwidth probing technique in an attempt to separate the two. Theoretical relationships between second intensity moments, (scattering coefficients, scatterer spacing, and its randomness) and the system's cell volume are stablished. Experiments on water filled sponge structures with pore size varying from .5 mm to 2 mm and pig liver tissue are performed. The slope and intercept values from normalized second intensity moments versus (cell volume)-1 …
Psychophysical Evaluation Of Gamut Mapping Techniques Using Simple Rendered Images And Artificial Gamut Boundaries, Ethan Montag, Mark Fairchild
Psychophysical Evaluation Of Gamut Mapping Techniques Using Simple Rendered Images And Artificial Gamut Boundaries, Ethan Montag, Mark Fairchild
Articles
Using a paired comparison paradigm, various gamut mapping algorithms were evaluated using simple rendered images and artificial gamut boundaries. The test images consisted of simple rendered spheres floating in front of a gray background. Using CIELAB as our device-independent color space, cut-off values for lightness and chroma, based on the statistics of the images, were chosen to reduce the gamuts for the test images. The gamut mapping algorithms consisted of combinations of clipping and mapping the original gamut in linear piecewise segments. Complete color space compression in RGB and CIELAB was also tested. Each of the colored originals (R,G,B,C,M,Y, and …
Is There Really A Super-Massive Black Hole In M87?, Alessandro Marconi, David Axon, Duccio Macchetto
Is There Really A Super-Massive Black Hole In M87?, Alessandro Marconi, David Axon, Duccio Macchetto
Articles
We present the first HST long-slit spectrum of a gaseous disk around a candidate super-massive black-hole. The results of this study on the kinematics of the gaseous disk in M87 are a considerable improvement in both spatial resolution and accuracy over previous observations and requires a projected mass of MBH(sin i)2 = (2.0 ± 0.5)×109M⊙ (MBH = 3.2×109M⊙ for a disk inclination i = 52◦) concentrated within a sphere whose radius is less than 0.′′05 (3.5 pc) to explain the observed rotation curve. The kinematics of the ionized gas is well described by a thin disk in keplerian motion. A …
Kinetic Vs. Thermodynamic Control In The Dehydration Of 2-Methylcyclopentanol, Thomas Poon, Bradford Mundy, Jean Mcintyre
Kinetic Vs. Thermodynamic Control In The Dehydration Of 2-Methylcyclopentanol, Thomas Poon, Bradford Mundy, Jean Mcintyre
Articles
A two part organic laboratory experiment illustrating the Grignard reaction and the concept of kinetic versus thermodynamic control is described. The reaction of phenylmagnesium bromide with 2-methylcyclopentanone yileds an unsymmetrical benzylic alcohol which can be dehydrated using toluenesulfonic acid to give predominately the less substituted alkene. Application of heat to the reaction mixture over a period of two hours reverses the trend to give the more substituted alkene as the major product in 91% relative yield. The dehydration is monitored by GC/MS and the experiment can be performed using macro and microscale techniques.