scholarly journals Diffraction-Limited Observations Of Binary Star Systems

1979 ◽  
Vol 50 ◽  
pp. 27-1-27-10 ◽  
Author(s):  
R.J. Scaddan ◽  
B.L. Morgan ◽  
J.C. Dainty
Keyword(s):  
Real Time ◽  
White Light ◽  
Binary Star ◽  
Chromatic Dispersion ◽  
Image Intensifier ◽  
Television Camera ◽  
Speckle Patterns ◽  
Cine Film ◽  
Magnitude Difference ◽  
Made In

AbstractA speckle interferometer is described which has been used to measure the separations and position angles of binary star systems. The present instrument uses an image intensifier to enable the enlarged stellar images to be recorded on cine-film. The exposure time is typically 8 msec and the camera can be operated at up to 20 frames per second. The instrument incorporates a means of calibrating the magnitude difference of the binary star systems.A pair of achromatising lenses have been designed which will correct the radial chromatic dispersion in the speckle patterns and allow exposures to be made in “white” light. A system is under development which uses an image intensifier and a plumbicon television camera to acquire the data and a hard-wired autocorrelator to perform the analysis in real time. With this system the limiting magnitude of the technique should be significantly improved.

scholarly journals A Deterministic Rapid Intensification Aid

2011 ◽  
Vol 26 (4) ◽  
pp. 579-585 ◽  
Author(s):  
Charles R. Sampson ◽  
John Kaplan ◽  
John A. Knaff ◽  
Mark DeMaria ◽  
Chris A. Sisko
Keyword(s):  
Real Time ◽  
Arithmetic Mean ◽  
Forecast Errors ◽  
Rapid Intensification ◽  
Intensity Forecast ◽  
Probability Threshold ◽  
Forecast Time ◽  
National Hurricane Center ◽  
Made In

Abstract Rapid intensification (RI) is difficult to forecast, but some progress has been made in developing probabilistic guidance for predicting these events. One such method is the RI index. The RI index is a probabilistic text product available to National Hurricane Center (NHC) forecasters in real time. The RI index gives the probabilities of three intensification rates [25, 30, and 35 kt (24 h)−1; or 12.9, 15.4, and 18.0 m s−1 (24 h)−1] for the 24-h period commencing at the initial forecast time. In this study the authors attempt to develop a deterministic intensity forecast aid from the RI index and, then, implement it as part of a consensus intensity forecast (arithmetic mean of several deterministic intensity forecasts used in operations) that has been shown to generally have lower mean forecast errors than any of its members. The RI aid is constructed using the highest available RI index intensification rate available for probabilities at or above a given probability (i.e., a probability threshold). Results indicate that the higher the probability threshold is, the better the RI aid performs. The RI aid appears to outperform the consensus aids at about the 50% probability threshold. The RI aid also improves forecast errors of operational consensus aids starting with a probability threshold of 30% and reduces negative biases in the forecasts. The authors suggest a 40% threshold for producing the RI aid initially. The 40% threshold is available for approximately 8% of all verifying forecasts, produces approximately 4% reduction in mean forecast errors for the intensity consensus aids, and corrects the negative biases by approximately 15%–20%. In operations, the threshold could be moved up to maximize gains in skill (reducing availability) or moved down to maximize availability (reducing gains in skill).

REAL-TIME DISPERSIVE REFRACTION WITH ADAPTIVE SPECTRAL MAPPING

2013 ◽  
Vol 22 (06) ◽  
pp. 1360019
Author(s):  
DAMON BLANCHETTE ◽  
EMMANUEL AGU
Keyword(s):  
Real Time ◽  
White Light ◽  
Spectral Mapping ◽  
Mapping Algorithm ◽  
Physically Based ◽  
Refractive Medium ◽  
Interactive Frame ◽  
Screen Space ◽  
Special Case ◽  
Novel Algorithm

Spectral rendering, or the synthesis of images by taking into account the constituent wavelengths of white light, enables the rendering of iridescent colors caused by phenomena such as dispersion, diffraction, interference and scattering. Caustics, the focusing and defocusing of light through a refractive medium, can be interpreted as a special case of dispersion where all the wavelengths travel along the same paths. In this paper we extend Adaptive Caustic Mapping (ACM), a previously proposed caustics mapping algorithm, to handle physically-based dispersion. Because ACM can display caustics in real-time, it is amenable to extension to handle the more general case of dispersion. We also present a novel algorithm for filling in the gaps that occur due to discrete sampling of the spectrum. Our proposed method runs in screen-space, and is fast enough to display plausible dispersion phenomena at real-time and interactive frame rates.

Blue-light imaging compared with high-definition white light for real-time histology prediction of colorectal polyps less than 1 centimeter: a prospective randomized study

2019 ◽  
Vol 89 (3) ◽  
pp. 554-564.e1 ◽  
Author(s):  
Emanuele Rondonotti ◽  
Silvia Paggi ◽  
Arnaldo Amato ◽  
Giuseppe Mogavero ◽  
Alida Andrealli ◽  
...  
Keyword(s):  
Real Time ◽  
Blue Light ◽  
White Light ◽  
Randomized Study ◽  
Colorectal Polyps ◽  
Prospective Randomized Study ◽  
High Definition

Contrast of white light speckle patterns at a defocused image plane

1979 ◽  
Vol 18 (22) ◽  
pp. 3725_1 ◽  
Author(s):  
K. Nakagawa ◽  
T. Asakura
Keyword(s):  
White Light ◽  
Image Plane ◽  
Speckle Patterns ◽  
Defocused Image

A Window Based Graphical User Interface for a Supersonic Combustion Fortran Code

1992 ◽  
Author(s):  
T. Gary Yip ◽  
Ajay R. Patel
Keyword(s):  
Real Time ◽  
Input Sequence ◽  
Supersonic Combustion ◽  
Input File ◽  
Input Interface ◽  
Wide Acceptance ◽  
Fortran Code ◽  
Questions And Answers ◽  
Application Programs ◽  
Made In

Abstract Fortran has been used widely in number crunching applications. In recent years, as the size of application programs increases significantly, users begin to demand interactive capability so that they can interface with the applications in real time in a more flexible and convenient manner. In spite of the wide acceptance by engineers in various fields in the seventies and eighties, Fortran currently does not offer these features. INPUT/OUTPUT are structured rigidly by the order of the READ and WRITE statements in the application programs. The situation would get even worse when the program requires a large number of inputs from the user. A user can use a large input file in which the data must be in a fixed format and no comment statements are allowed. An alternative is to write a real time input interface with requests for inputs displayed on the screen. This leads to a long list of questions and answers scrolling up the screen. When a mistake is made in answering any one of the questions, the input sequence has to be restarted at the beginning of the program again.

scholarly journals A Two-Dimensional White-Light Amplitude Interferometer

1979 ◽  
Vol 50 ◽  
pp. 31-1-31-13
Author(s):  
James B. Breckinridge
Keyword(s):  
White Light ◽  
Double Star ◽  
Two Dimensional ◽  
Stellar Interferometer ◽  
Speckle Patterns ◽  
New Material

AbstractA review of the applications of a point-symmetric, 180-degree, rotational shearing interferometer is given. Material includes, photographs of the Michelson stellar interferometer fringes from α Lyr, measures of amplitude of phase excursions in the atmosphere, and a measure of the order of interference in speckle patterns. New material includes unpublished double star speckle patterns to illustrate the isoplanatic patch, a measure of the time fluctuations of the earths' atmosphere, and measurements of the properties of a 256 channel linear reticon.

Real-time multi-analyte label-free detection of proteins by white light reflectance spectroscopy

2014 ◽  
Author(s):  
Panagiota Petrou ◽  
Georgios Koukouvinos ◽  
Dimitrios Drygiannakis ◽  
Dimitris Goustouridis ◽  
Ioannis Raptis ◽  
...  
Keyword(s):  
Real Time ◽  
White Light ◽  
Reflectance Spectroscopy ◽  
Label Free ◽  
Label Free Detection ◽  
Light Reflectance

Comparison of Three Display Methodologies for Battlefield Resource Management

1998 ◽  
Vol 42 (5) ◽  
pp. 476-480 ◽  
Author(s):  
Daniel N. Mountjoy ◽  
Celestine A. Ntuen ◽  
Philip L. Yarbrough
Keyword(s):  
Resource Management ◽  
Real Time ◽  
Complete Data ◽  
Timely Manner ◽  
Military Forces ◽  
Made In

As the Army prepares to move into the next century, it is exploring advances in technology that will enable U.S. military forces to obtain more complete data regarding its mission, enemy and friendly troop locations, weather, and target status. Not only will this data be more accurate, it will be collected and transmitted in near real-time. Advanced displays must be developed that allow commanders to efficiently deal with large volumes of data so that effective decisions can be made in a timely manner. This paper describes an experiment comparing three methods of displaying battlefield resources and unit mobility: (1) a combination of alphanumerics and standard Army decision graphics, (2) a configural display (CD) representation, and (3) an associative configural display representation (ACD). Results indicate that performance benefits are realized from both the CD and ACD representations, but the CD proved to be the best overall.

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