Results 201 to 210 of about 5,553,211 (231)
Minimal Impact of Prior Common Cold Coronavirus Exposure on Immune Responses to Severe Acute Respiratory Syndrome Coronavirus 2 Vaccination or Infection Risk in Older Adults in Congregate Care. [PDF]
Open Forum Infect DisBreznik JA +15 more
europepmc +1 more source
Image Perspective TransformationsÃÂââÃÂìâÃÂ?Urban Scenes [PDF]
Optical Engineering, 1981 This paper discusses a technique for converting digitized oblique low-altitude aerial photography to gray level imagery as seen from other viewing perspectives. The technique makes use of one- and two-camera perspective transformations. Inputs to these transformations are camera model information and a stick figure representation of the scene.
Robert N. Devich, Frederick M. Weinhaus
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Some of the next articles are maybe not open access.
Atmospheric Optical PropagationÃÂââÃÂìâÃÂ?An Integrated Approach
Optical Engineering, 1982The task of characterizing optical wave propagation through the earth's atmosphere under low-visibility weather conditions is extremely difficult; it requires, in essence, solution of the general multiple-scattering problem. This paper describes results from an integrated approach to propagation through the turbid atmosphere in which experiments are ...
Jeffrey H. Shapiro +4 more
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Optical Engineering, 1984
We have previously reported on the conceptual design and predicted performance of a new type of dedicated astronomical telescope to be used for a deep photometric survey for galactic and extragalactic variability and polarization.' Data derived from this survey will be useful for a wide variety of astronomical investigations including the definition of
J. T. McGraw +4 more
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We have previously reported on the conceptual design and predicted performance of a new type of dedicated astronomical telescope to be used for a deep photometric survey for galactic and extragalactic variability and polarization.' Data derived from this survey will be useful for a wide variety of astronomical investigations including the definition of
J. T. McGraw +4 more
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Optical Engineering, 1982
Most of the laser speckle methods utilize subjective speckles in that speckles are recorded through a lens whose aperture determines the admitted spatial frequencies. Objective speckles are those intrinsically formed by the scattering wavelets. In this paper we propose the use of far-field objective speckles generated from a ground glass to measure ...
C. C. Kin, Fu-Pen Chiang
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Most of the laser speckle methods utilize subjective speckles in that speckles are recorded through a lens whose aperture determines the admitted spatial frequencies. Objective speckles are those intrinsically formed by the scattering wavelets. In this paper we propose the use of far-field objective speckles generated from a ground glass to measure ...
C. C. Kin, Fu-Pen Chiang
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An Efficient k-Means Clustering Algorithm: Analysis and Implementation
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2002In k-means clustering, we are given a set of n data points in d-dimensional space R/sup d/ and an integer k and the problem is to determine a set of k points in Rd, called centers, so as to minimize the mean squared distance from each data point to its ...
T. Kanungo +5 more
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Angewandte Chemie, 2018
Endowing materials with specific functions that are not readily available is always of great importance, but extremely challenging. Co4 N, with its beneficial metallic characteristics, has been proved to be highly active for the oxidation of water, while
Zhi-Yan Chen +11 more
semanticscholar +1 more source
Endowing materials with specific functions that are not readily available is always of great importance, but extremely challenging. Co4 N, with its beneficial metallic characteristics, has been proved to be highly active for the oxidation of water, while
Zhi-Yan Chen +11 more
semanticscholar +1 more source
Design Of Null Lens Correctors For The Testing Of Astronomical NnfitÃÂââÃÂìÃÂÃÂC
Optical Engineering, 1988Some design examples are presented that illustrate the design of null correctors for the testing of strong aspherical surfaces such as those that are of interest in astronomical instrumentation. The design and analysis of an Offner corrector for an f/1 paraboloid is given.
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