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  • 1
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    An empirical site-classification method for strong-motion stations in Japan using H/V response spectral ratio (2006)
    In:  Bulletin of the Seismological Society of America, Kunming, China, 3-4, vol. 96, no. 3, pp. 914-925, pp. B05301, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Seismology ; Attenuation ; Strong motions ; Earthquake hazard ; Spectrum ; Site amplification ; Horizontal to vertical spectral ratio ; Nakamura ; Micro-tremor (seismic noise) ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Attenuation relations of strong ground motion in Japan using site classification based on predominant period (2006)
    In:  Bulletin of the Seismological Society of America, Kunming, China, 3-4, vol. 96, no. 3, pp. 898-913, pp. B05301, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Seismology ; Attenuation ; Strong motions ; Earthquake hazard ; Spectrum ; Site amplification ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Inference of 3-dimensional structure underlying large-scale coronal events observed by Yohkoh and Ulysses (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Yohkoh/SXT images provide full-disk coverage of the solar corona, usually extending before and after one of the large-scale eruptive events that occur in the polar crown These produce large arcades of X-ray loops, often with a cusp-shaped coronal extension, and are known to be associated with coronal mass ejections. The Yohkoh prototype of such events occurred 12 Nov. 1991. This allows us to determine heights from the apparent rotation rates of these structures. In comparison v with magnetic-field extrapolations from Wilcox Solar Observatory. use use this tool to infer the three dimensional structure of the corona in particular cases: 24 Jan. 1992, 24 Feb. 1993, 14 Apr. 1994, and 13 Nov. 1994. The last event is a long-duration flare event.
    Keywords: Solar Physics
    Type: ; 63
    Format: text
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  • 4
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    The coronal and interplanetary current sheet in early 1976 (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A comparison of Helios 1 and 2 observations of the interplanetary sector pattern in early 1976 with the maximum brightness curves in the K coronameter data at 1.5 solar radii shows that the latter may be identified with the footprints of the sector boundary surface to an accuracy of about 10 deg. The sector boundary surface probably extended to about 15 deg in the Northern Hemisphere and to about 30 deg in the Southern Hemisphere, with little change between 1.5 solar radii and 1 AU. The surface was warped appreciably from a single titled plane (a dipole configuration) suggesting a significant magnetic quadrupole contribution.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 86; Oct. 1
    Format: text
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  • 5
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    Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new method for design and generation of spiral bevel gears of uniform tooth depth with localized bearing contact and low level of transmission errors is considered. The main features of the proposed approach are as follows: (1) the localization of the bearing contact is achieved by the mismatch of the generating surfaces. The bearing contact may be provided in the longitudinal direction, or in the direction across the surface; and (2) the low level of transmission errors is achieved due to application of nonlinear relations between the motions of the gear and the gear head-cutter. Such relations may be provided by application of a CNC machine. The generation of the pinion is based on application of linear relations between the motions of the tool and the pinion being generated. The relations described above permit a parabolic function of transmission errors to be obtained that is able to absorb almost linear functions caused by errors of gear alignment. A computer code has been written for the meshing and contact of the spiral bevel gears with the proposed geometry. The effect of misalignment on the proposed geometry has also been determined. Numerical examples for illustration of the proposed theory have been provided.
    Keywords: Mechanical Engineering
    Type: NASA-CR-4704 , ARL-CR-287 , NAS 1.26:4704 , E-10086
    Format: application/pdf
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  • 6
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    Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new method for design and generation of spiral bevel gears of uniform tooth depth with localized bearing contact and low level of transmission errors is considered. The main features of the proposed approach are as follows: (1) The localization of the bearing contact is achieved by the mismatch of the generating surfaces. The bearing contact may be provided in the longitudinal direction, or in the direction across the surface; and (2) The low level of transmission errors is achieved due to application of nonlinear relations between the motions of the gear and the gear head-cutter. Such relations may be provided by application of a CNC machine. The generation of the pinion is based on application of linear relations between the motions of the tool and the pinion being generated. The relations described above permit a parabolic function of transmission errors to be obtained that is able to absorb almost linear functions caused by errors of gear alignment. A computer code has been written for the meshing and contact of the spiral bevel gears with the proposed geometry. The effect of misalignment on the proposed geometry has also been determined. Numerical examples for illustration of the proposed theory have been provided.
    Keywords: Mechanical Engineering
    Type: AD-A309566 , E-10086 , ARL-CR-287 , NASA-CR-4704 , NAS 1.26:4704
    Format: application/pdf
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  • 7
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    The solar/interplanetary event of 14 April 1994 observed by Yohkoh/SXT (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The polar crown event of April 14 1994 is one of the largest scale eruptive events observed by the Yohkoh/SXT. Associated with the formation of an arcade of soft X-ray loops at the Sun was the detection of an interplanetary forward/reverse shock event by the Ulysses spacecraft some 4-7 days later. The relationship between the coronal and interplanetary signatures of these events is important if we are to address fully the initialization and consequent acceleration of interplanetary phenomena, such as CMEs and counter-streaming electrons, originating at the Sun. From detailed analysis of the energetics of the arcade formed during the eruption of April 14 1994, we find peak temperatures and emission measures of approximately 5MK and approximately 10(exp 48)cm(exp -3) respectively. The total thermal content of the arcade loop structure observed in soft X-rays is calculated to be some 5 x 10(exp 29) ergs. The development of these parameters as the event proceeds and their relationship to the dynamics of the eruption are investigated. Although spanning a longitudinal range of some 150 degrees the April 14 event displayed the typical helmet streamer structure normally associated with coronal mass ejections These helmet streamers are thought to be related to the global solar magnetic field through the heliospheric current sheet (HCS). The arcade formation, together with the eruption of material into interplanetary space, signifies a large-scale reconfiguration of the coronal magnetic field. We examine the effects of the formation of such a coronal arcade structure on the HCS and discuss the dynamics involved with the passage of a large scale disturbance through the interplanetary magnetic field.
    Keywords: Solar Physics
    Type: ; 57
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Prediction of coronal and heliospheric magnetic fields: The promise of SOI-MDI on SOHO (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Models of the coronal magnetic field have been developed over the years that reproduce the static characteristics of coronal and heliospheric structures fairly well. Limitations of spatial and temporal resolution and nonuniform quality of the input data have made it particularly difficult to investigate the response of the corona to rapidly changing photospheric conditions. The Solar Oscillations Investigation (SOI) experiment on SOHO, scheduled for launch late in 1995, will produce a series of full-disk photospheric magnetic field observations with 4" resolution about every 2 hours for the next several years. Higher resolution observations of the center of the disk will be available several times per day. These data should provide a basis for predicting the coronal and heliospheric field and their changes with unprecedented accuracy during the rising phase of Solar Cycle 23.
    Keywords: Solar Physics
    Type: ; 57
    Format: text
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  • 9
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    Self-tuning control of attitude and momentum management for the Space Station (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper presents a hybrid state-space self-tuning design methodology using dual-rate sampling for suboptimal digital adaptive control of attitude and momentum management for the Space Station. This new hybrid adaptive control scheme combines an on-line recursive estimation algorithm for indirectly identifying the parameters of a continuous-time system from the available fast-rate sampled data of the inputs and states and a controller synthesis algorithm for indirectly finding the slow-rate suboptimal digital controller from the designed optimal analog controller. The proposed method enables the development of digitally implementable control algorithms for the robust control of Space Station Freedom with unknown environmental disturbances and slowly time-varying dynamics.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 15; 17-27
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  • 10
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    Modeling boot-shaped coronal holes using SOHO-MDI magnetic measurements (1997)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: The boot-shaped coronal hole observed between the 22 and 30 August 1996, reproduced by rigidly rotating the data computed on 27 August with the rotation rate near the solar equator, is discussed. The data were acquired by the Michelson Doppler imager (MDI) onboard the Solar and Heliospheric Observatory (SOHO). The results suggest that change in size and shape of the holes observed during the period is caused by the projection effect. It was found that the whole solar observational synoptic chart may be used to approximately reproduce boot-shaped holes in solar minimum.
    Keywords: Solar Physics
    Type: ; 751-755
    Format: text
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