Results 291 to 300 of about 72,816 (336)
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Applied Optics, 1992
We describe the design, construction, and performance of a resonant cryogenic chopper that operates at 4.2 K. The chopper is mechanically and thermally robust; it can occult a 2.54-cm aperture at 4.5 Hz while dissipating ~1 mW. Both the stator and rotor magnetic fields are controllable to allow for performance optimization and to help in measuring any ...
L A, Page, E S, Cheng, S S, Meyer
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We describe the design, construction, and performance of a resonant cryogenic chopper that operates at 4.2 K. The chopper is mechanically and thermally robust; it can occult a 2.54-cm aperture at 4.5 Hz while dissipating ~1 mW. Both the stator and rotor magnetic fields are controllable to allow for performance optimization and to help in measuring any ...
L A, Page, E S, Cheng, S S, Meyer
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Terahertz antenna electronic chopper
Review of Scientific Instruments, 2016In this paper, we present an electronic circuit used to bias a photoconductive antenna that generates terahertz radiation. The working principles and the design process for the device are discussed in detail. The noise and shape of the wave measurements for a built device are considered. Furthermore, their impact on a terahertz pulse and its spectra is
L. A. Sterczewski +2 more
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2001
Abstract One of the things which most astonished almost all the participants in these controversies was the sheer inability of their adversaries to understand the plain meaning of scripture.Indeed, the very fact that so much else was held in common made their disagreement on this all the more puzzling—foes who had begun as members of a ...
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Abstract One of the things which most astonished almost all the participants in these controversies was the sheer inability of their adversaries to understand the plain meaning of scripture.Indeed, the very fact that so much else was held in common made their disagreement on this all the more puzzling—foes who had begun as members of a ...
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Applied Optics, 1973
Mechanical light choppers are used in many optical systems with a great deal of success. At high PRF's, however, designers often tend to avoid their use because of stress and torque limitations. This article attempts to provide an optical engineer with sufficient information to compute the maximum stresses in a chopper wheel.
F T, Wenthen, L R, Snowman
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Mechanical light choppers are used in many optical systems with a great deal of success. At high PRF's, however, designers often tend to avoid their use because of stress and torque limitations. This article attempts to provide an optical engineer with sufficient information to compute the maximum stresses in a chopper wheel.
F T, Wenthen, L R, Snowman
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Long Range Planning, 2006
This article explores the conditions under which organizational change increases the risk of organizational failure. To reach this goal, we examine the pros and cons of flexibility and inertia arguments. Empirically, we measure the survival consequences of product portfolio expansion in the British motorcycle industry during the period from 1895 to ...
Wezel, F C, van Witteloostuijn, A
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This article explores the conditions under which organizational change increases the risk of organizational failure. To reach this goal, we examine the pros and cons of flexibility and inertia arguments. Empirically, we measure the survival consequences of product portfolio expansion in the British motorcycle industry during the period from 1895 to ...
Wezel, F C, van Witteloostuijn, A
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A correlation chopper or chopper with coding disk
Nuclear Instruments and Methods, 1974Abstract The properties of various decoding methods of results obtained by a correlation chopper are analysed. A new method of diminishing the background was demonstrated. Some conclusions leading to construction of new devices are presented.
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