4,585 research outputs found
Process for making diamonds
A description is given of a device and process for making industrial diamonds. The device is composed of an exponential horn tapering from a large end to a small end, with a copper plate against the large end. A magnetic hammer abuts the copper plate. The copper plate and magnetic hammer function together to create a shock wave at the large end of the horn. As the wave propagates to the small end, the extreme pressure and temperature caused by the wave transforms the graphite, present in an anvil pocket at the small end, into diamonds
Synthesis of diamonds
Shock wave transmitted through a solid exponential horn generates heat and pressure to convert part of a charge of graphite to diamonds. The shock wave is generated in the apparatus by a complex of magnetic fields and eddy currents
Digital correlation of DDRS data
The reduction of digital SAR (synthetic aperture radar) data to radar images for use in remote sensing applications was investigated. The critical software operations are discussed in detail, and suggestions and recommendations are made for improving the algorithms currently being used
Development of a ground signal processor for digital synthetic array radar data
A modified APQ-102 sidelooking array radar (SLAR) in a B-57 aircraft test bed is used, with other optical and infrared sensors, in remote sensing of Earth surface features for various users at NASA Johnson Space Center. The video from the radar is normally recorded on photographic film and subsequently processed photographically into high resolution radar images. Using a high speed sampling (digitizing) system, the two receiver channels of cross-and co-polarized video are recorded on wideband magnetic tape along with radar and platform parameters. These data are subsequently reformatted and processed into digital synthetic aperture radar images with the image data available on magnetic tape for subsequent analysis by investigators. The system design and results obtained are described
APQ-102 imaging radar digital image quality study
A modified APQ-102 sidelooking radar collected synthetic aperture radar (SAR) data which was digitized and recorded on wideband magnetic tape. These tapes were then ground processed into computer compatible tapes (CCT's). The CCT's may then be processed into high resolution radar images by software on the CYBER computer
Global Earth Response to Loading by Ocean Tide Models
Mathematical and programming techniques to numerically calculate Earth response to global semidiurnal and diurnal ocean tide models were developed. Global vertical crustal deformations were evaluated for M sub 2, S sub 2, N sub 2, K sub 2, K sub 1, O sub 1, and P sub 1 ocean tide loading, while horizontal deformations were evaluated for the M sub 2 tidal load. Tidal gravity calculations were performed for M sub 2 tidal loads, and strain tensor elements were evaluated for M sub 2 loads. The M sub 2 solution used for the ocean tide included the effects of self-gravitation and crustal loading
Application of Thermal Storage, Peak Shaving and Cogeneration for Hospitals
Energy costs of hospitals can be managed by
employing various strategies to control peak
electrical demand (KW) while at the same time
providing additional security of operation in
the event that an equipment failure or a
disruption of power from the electric utility
occurs. Some electric utilities offer their
customers demand (KW) reduction rate incentives.
Many hospitals have additional emergency back-up
needs for electrical energy. Demand is
relatively constant in many hospitals due to
high internal loads. These factors coupled with
the present competitive alternate fuel market
and present opportunities for hospitals to
significantly reduce operating costs and provide
additional stand-by or back-up electric sources.
This paper employs a hospital case study to
define and illustrate three energy planning strategies applicable to hospitals. These
strategies are peak shaving, thermal storage,
cogeneration and/or paralleling with the
electric utility
Exact Half-BPS Flux Solutions in M-theory with Symmetry: Local Solutions
We construct local solutions to 11-dimensional supergravity (or M-theory),
which are invariant under the superalgebra for all values of the parameter . The BPS constraints are reduced to a
single linear PDE on a complex function . The PDE was solved in 0806.0605
modulo application of boundary and regularity conditions. The physical fields
of the solutions are determined by , a harmonic function , and the
complex function . and are both functions on a 2-dimensional
compact Riemannian manifold. The harmonic function is freely chosen. We
obtain the expressions for the metric and the field strength in terms of ,
, and and show that these are indeed valid solutions of the Einstein,
Maxwell, and Bianchi equations. Finally we give a construction of one parameter
deformations of and as a function of
Computer modeling of a wideswath SAR concept employing multiple antenna beam formation techniques
A technique for wideswath synthetic aperture radar coverage, was implemented into the OSS (orbital sar simulation) computer programs. The OSS modifications, and the implementation and simulation of the concept are described. The wideswath technique uses formed multiple antenna beams
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