scispace - formally typeset
Search or ask a question
Institution

Raytheon

CompanyWaltham, Massachusetts, United States
About: Raytheon is a company organization based out in Waltham, Massachusetts, United States. It is known for research contribution in the topics: Signal & Antenna (radio). The organization has 15290 authors who have published 18973 publications receiving 300052 citations.
Topics: Signal, Antenna (radio), Radar, Turbine, Amplifier


Papers
More filters
Patent
17 Jul 2007
TL;DR: In this article, a robot displacement device for use with a robotic frame shaped to approximate and be coupleable to at least a portion of the human body and configured to mimic movement of human body is presented.
Abstract: A robot displacement device for use with a robotic frame shaped to approximate and be coupleable to at least a portion of the human body and configured to mimic movement of the human body The device employs a plurality of force sensors, which are attached to the robotic frame which detect a baseline controlling interface force status relationship between the sensors and the extremities of the human operator Based on the output force signal from the sensors, and the force and direction of gravity relative to the robotic frame, a computation system calculates at least a rotational force required to maintain the controlling force status relationship The computation system then generates and transmits an actuation signal to a drive system attached to the robotic frame which displaces a portion of the robotic frame in order to maintain the controlling force status relationship

75 citations

Journal ArticleDOI
TL;DR: In this article, a new approach to fitting the UV-to-optical spectra of B stars to model atmospheres was described and a sample of lightly reddened stars was used to demonstrate that the Kurucz model can produce excellent fits to either combined low-dispersion IUE and optical photometry or HST FOS spectrophotometry.
Abstract: We describe a new approach to fitting the UV-to-optical spectra of B stars to model atmospheres and present initial results. Using a sample of lightly reddened stars, we demonstrate that the Kurucz model atmospheres can produce excellent fits to either combined low-dispersion IUE and optical photometry or HST FOS spectrophotometry, as long as the following conditions are fulfilled: (1) an extended grid of Kurucz models is employed; (2) the IUE NEWSIPS data are placed on the FOS absolute flux system using the Massa & Fitzpatrick transformation; (3) and all of the model parameters and the effects of interstellar extinction are solved for simultaneously. When these steps are taken, the temperatures, gravities, abundances, and microturbulence velocities of lightly reddened B0-A0 V stars are determined to high precision. We also demonstrate that the same procedure can be used to fit the energy distributions of stars that are reddened by any UV extinction curve that can be expressed by the Fitzpatrick & Massa parameterization scheme. We present an initial set of results and verify our approach through comparisons with angular diameter measurements and the parameters derived for an eclipsing B-star binary. We demonstrate that the metallicity derived from the ATLAS9 fits to main-sequence B stars is essentially the Fe abundance. We find that a near zero microturbulence velocity provides the best fit to all but the hottest or most luminous stars (where it may become a surrogate for atmospheric expansion) and that the use of white dwarfs to calibrate UV spectrophotometry is valid.

75 citations

Journal ArticleDOI
TL;DR: In this paper, the electron density profile in the F region bottomside is described in the International Reference Ionosphere (IRI) by two parameters: a thickness parameter B 0 and a shape parameter B 1.

74 citations

Patent
Kai Jensen1
27 Dec 1982
TL;DR: In this paper, an improved electronic circuit module retainer is presented, having interlocking, wedge-shaped components which are slotted and keyed together to allow tightening using a single screw which can be turned from the module insertion side of a module enclosure.
Abstract: An improved electronic circuit module retainer apparatus having interlocking, wedge-shaped components which are slotted and keyed together to allow tightening using a single screw which can be turned from the module insertion side of a module enclosure. A module retainer has a minimum of three interlocking parts which are held together by a tightening screw. A center body of the module retainer has holes for attaching it to a module or a module enclosure; it has a U-shaped channel with a square cross section and sloped ends. Each end body has a keying guide extending from a sloped end. A screw extends through a clearance hole in an end-body, then through the center body U-shaped channel and finally into a threaded hole in an opposite end body. When the screw is tightened, the end bodies slide along the sloped ends of the center body causing them to wedge the module against the module enclosure walls. The end bodies are held in alignment with respect to the center body using keying guides which extend from the end bodies into slots in the base of the center body. The interlocking components of the module retainer apparatus also provide a good thermal transfer path.

74 citations


Authors

Showing all 15293 results

NameH-indexPapersCitations
Peter J. Kahrilas10958646064
Edward J. Wollack104732102070
Duong Nguyen9867447332
Miroslav Krstic9595542886
Steven L. Suib8986234189
Gabriel M. Rebeiz8780632443
Charles W. Engelbracht8321028137
Paul A. Grayburn7739726880
Eric J. Huang7220122172
Thomas F. Eck7215032965
David M. Margolis7022717314
David W. T. Griffith6528814232
Gerhard Klimeck6568518447
Nickolay A. Krotkov6321911250
Olaf Stüve6329014268
Network Information
Related Institutions (5)
United States Naval Research Laboratory
45.4K papers, 1.5M citations

86% related

Bell Labs
59.8K papers, 3.1M citations

83% related

Samsung
163.6K papers, 2M citations

83% related

Georgia Institute of Technology
119K papers, 4.6M citations

83% related

Hewlett-Packard
59.8K papers, 1.4M citations

82% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20232
20228
2021265
2020655
2019579
2018457