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On the structure of context-sensitive grammars

By: Book, R. V

Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents; Context sensitive grammar and generation of noncontext free languages...

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Noise reduction in a turbulent jet by the method of repeated air injection

By: Melnikov, B. N., et al

Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents; Noise reduction in turbulent axisymmetric gas jet by repeated air injection method applied to supersonic transport aircraft...

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SNR behavior of coherent phase demodulators. Radio communications study on noise threshold reduction Final report

By: Ghais, A. F. ; Wachsman, R. H

Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents; Signal to noise ratio analysis at outputs of three coherent phase detectors for radio noise threshold reduction study...

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Re-entry ''F'' nose vibration and shock test Final report

By: Most, M

Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents; Vibration and shock tests on reentry nose configurations...

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Sloshing parameters for spherical tanks

By: Anderson, G. W

Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents

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TO SINUSOIDAL AC CONVERSION

By: Wilson, T. G

Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents; Static dc to sinusoidal ac conversion...

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A METHOD FOR CALCULATING THE GENERALIZED AERODYNAMIC FORCES ON RECTANGULAR WINGS DEFORMING SYMMETRICALLY IN SUPERSONIC FLIGHT WITH INDICIAL OR SINUSOIDAL TIME DEPENDENCE

By: Bond, R. ; Summers, A. L. ; Warner, R. W; Packard, B. B.

Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents; Computations, generalized aerodynamics, supersonic, rectangular wings, time dependence...

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Simultaneous Hf Measurements of E- and F-region Doppler Velocities at Large Flow Angles : Volume 22, Issue 4 (02/04/2004)

By: A. V. Koustov; F. Honary; R. A. Makarevitch

Description: Department of Communication Systems, Lancaster University, Lancaster, LA1 4YR, UK. Data collected by the CUTLASS Finland HF radar are used to illustrate the significant difference between the cosine component of the plasma convection in the F-region and the Doppler velocity of the E-region coherent echoes observed at large flow angles. We show that the E-region velocity is ~5 times smaller in magnitude and rotated by ~30° clockwise with respect to convection in the F-region. Also, measurements at flow angles larger than 90° exhibit a completely new feature: Doppler velocity increase with the expected aspect angle and spatial anticorrelation with the backscatter power. By considering DMSP drift-meter measurements we argue that the difference between F- and E-region velocities cannot be interpreted in terms of the convection change with latitude. The observed features in the velocity of the E-region echoes can be explained by taking into account the ion drift contribution to the irregularity phase velocity as predicted by the linear fluid theory.

Key words. Ionosphere (auroral ionosphere; io...

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Stare Velocity at Large Flow Angles: is it Related to the Ion Acoustic Speed? : Volume 24, Issue 3 (19/05/2006)

By: A. V. Koustov; S. Nozawa; M. V. Uspensky

Description: Finnish Meteorological Institute, Erik Palminin Aukio 1, P.O. Box 503, Helsinki FIN-00101, Finland. The electron drift and ion-acoustic speed in the E region inferred from EISCAT measurements are compared with concurrent STARE radar velocity data to investigate a recent hypothesis by Bahcivan et al. (2005), that the electrojet irregularity velocity at large flow angles is simply the product of the ion-acoustic speed and the cosine of an angle between the electron flow and the irregularity propagation direction. About 3000 measurements for flow angles of 50°–70° and electron drifts of 400–1500 m/s are considered. It is shown that the correlation coefficient and the slope of the best linear fit line between the predicted STARE velocity (based solely on EISCAT data and the hypothesis of Bahcivan et al. (2005)) and the measured one are both of the order of ~0.4. Velocity predictions are somewhat better if one assumes that the irregularity phase velocity is the line-of-sight component of the E×B drift scaled down by a factor ~0.6 due to off-orthogonality of irregularity propagation (...

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Stare Velocities: the Importance of Off-orthogonality and Ion Motions : Volume 21, Issue 3 (30/11/-0001)

By: S. Nozawa; P. Janhunen; A. Koustov; R. Pellinen; D. Danskin; M. Uspensky

Description: Finnish Meteorological Institute, Geophisycal Research, P.O. Box 503, FIN-00101, Helsinki, Finland. A 3.5-h morning event of joint EISCAT/STARE observations is considered and the differences between the observed STARE velocities and the electron drift components (EISCAT) are studied. We find that the STARE-Finland radar velocity was larger than the EISCAT convec-tion component for a prolonged period of time. In addition, a moderate 5–20° offset between the EISCAT convection azimuth and the corresponding STARE estimate was observed. We show that both the STARE-Finland radar velocity "over-speed" and the offset in the azimuth can be explained by fluid plasma theory, if the ion drift contribution to the irregularity phase velocity is taken into account under the condition of a moderate backscatter off-orthogonality. We call such an explanation the off-orthogonal fluid approach (OOFA). In general terms, we found that the azimuth of the maxi-mum irregularity phase velocity Vph is not collinear with the VE × B electron flow directio...

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Memory Search by a Memorist

By: Thompson, Charles P; Cowan, Thaddeus M; Frieman, Jerome

Book digitized from the library of Harvard University.; Includes bibliographical references (p. 146-148) and indexes

Additional Subjects: Mnemonics

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Système mnémonique:

By: Basslé, Gustave Adolphe.
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The secret of a good memory

By: Granville, J. Mortimer (Joseph Mortimer), 1833-1900; Clarke, J. W
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The Adventures of a Pincushion : Designed Chiefly for the Use of Young Ladies ; In Two Volumes

By: Kilner, Mary Ann, 1753-1831

Engraved plates are hand-colored; Orange cord cloth over boards; blocked in blind; all edges gilt. Title blocked in gold on upper board. In case; Inscription in ink on upper free endpaper: Jessie Lee, Monitor's Prize, Xmas 1871; Ex libris Elvah Karshner; Ex libris George Hubbard; his sine lumine nihil label, engraved by A.I.D., dated 1916; Misattributed to Dorothy Kilner...

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One thousand secrets of rich and wise men revealed

By: Bogardus, C. A

Supplemental catalog subcollection information: American Libraries Collection; American University Library Collection; Sloan candidate

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One Thousand Secrets of Rich and Wise Men Revealed

By: Bogardus, C. A

Mnemonics, Proverbs

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The action of unsteady pressure pulse on a body in a liquid or gas

By: Golubinskiy, A. I., et al

Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents; Unsteady pressure pulse action on body in liquid or gas...

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Correct Normalization of the Dst Index : Volume 4, Issue 2 (18/07/2008)

By: L. Holappa; A. Karinen; K. Mursula

Description: Department of Physical Sciences, P.O.Box 3000, FIN-90014, University of Oulu, Finland. The Dst index has been one of the most important solar-terrestrial indices for decades, and it is used in numerous studies as a measure of the temporal development and intensity of magnetic storms and the ring current. Here we discuss two issues related to the relative and absolute normalization that are problematic to the Dst index. We show for the first time quantitatively that the magnetic disturbances at the four Dst stations are ordered according to the latitudinal projection of an equatorial disturbance upon the local horizontal component of the geomagnetic field. Therefore, the disturbances observed at each station should be first normalized by the cosine of the geomagnetic latitude of the station before they are averaged to form the Dst index. Perhaps surprisingly, the recipe to calculate the Dst index does not include this normalization and, therefore, must be revised on this part. We also discuss the effects of correcting the quiet-time seasonal variation, the so called non-storm co...

Cliver, E. W., Kamide,~Y., Ling,~A G., and Yokoyama,~N.: Semiannual variation of the geomagnetic \emphDst index: Evidence for a dominant nonstorm component, J. Geophys. Res., 106, 21 297–21 304, 2001.; Karinen, A. and Mursula,~K.: A new reconstruction of the \emphDst index for 1932–2002, Ann. Geophys., 23, 475–485, 2005.; Karinen, A. and Mursula,~K.: Correcting the \emphDst index: Consequences for absolute level and correlations, J. Geophys. Res., 111, A08207, doi:10.1029/2005JA011299, 2006.; Mursula, K. and Karinen,~A.: Explaining and correcting the excessive semiannual variation in the \emphDst index, Geophys. Res. Lett., 32, L14107, doi:10.1029/2005GL023132, 2005.; Sugiura, M.: IAGA Resolution 2, in IAGA Bulletin, Madrid, Spain, 27, 123, 1969.; Sugiura, M. and Kamei,~T.: Equatorial \emphDst index 1957–1986, in IAGA Bull., 40, edited by A. Berthelier and M. Menvielle, ISGI Publ. Off., Saint-Maur-des-Fossés, France, 1991.; WDC-C2, Definition of the \emphDst index. The World Data Center for Geomagnetism (WDC-C2), http://swdcdb.kugi.kyoto-u.ac.jp, Kyoto, Japan, 2004....

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Retrieval of Land Surface Temperature Diurnal Cycle Model Parameters from Kalpana-1 Vhrr Data Over India : Volume Xl-8, Issue 1 (28/11/2014)

By: A. Gujrati; H. J. Trivedi; D. B. Shah; R. P. Singh; M. R. Pandya

Description: N. V. Patel college of Pure and Applied Sciences, Vallabh Vidyanagar, 388120, Gujarat, India. Land Surface Temperature (LST) is an important parameter in the land surface processes on regional and global scale. The Land Surface Temperature Diurnal (LSTD) cycle of different land cover is an excellent indicator of the surface processes and their interaction with planetary boundary layer. The Kalpana-1 very high resolution radiometer (VHRR) LST product is available with 30 minute spatial resolution and 0.1 degree temporal resolution. A study was carried out with an objective to determine the LSTD parameters directly from K1-VHRR monthly averaged LST observations over Indian landmass. In this analysis, a harmonic function is fitted to LSTD from the K1-VHRR observations, where cosine term describing the effect of sun and exponential term represents decay of LST during nighttime. Using LSTD parameters, one can directly know the temperature amplitude, residual temperature and time of maximum temperature for each pixel. The LSTD parameters fitting accuracy in root mean square error (RMSE) and coefficient of determinatio...

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Crossover Analysis of Chang'E-1 Laser Altimeter Data : Volume Xxxviii-4/W25, Issue 1 (31/08/2012)

By: K. Di; Z. Yue; W. Hu

Description: Institute of Remote Sensing Applications, Chinese Academy of Sciences P. O. Box 9718, Datun Rd, Chaoyang District, Beijing 100101, P.R.China. This paper presents a preliminary result of crossover analysis and adjustment of Chang'E-1(CE-1) Laser Altimeter (LAM) data of the Moon for global and regional mapping applications. During the operation of Chang'E-1 from November 28, 2007 to December 4, 2008, the laser altimeter acquired 1400 orbital profiles with about 9.12 million altimetric points. In our experiment, we derived more than 1.38 million crossovers from 1395 ground tracks covering the entire lunar surface after eliminating outliers of orbits and altimetric points. A method of least-squares crossover adjustment with a series of basis functions of time (trigonometric functions and polynomials) is developed to reconcile the LAM data by minimizing the crossover residuals globally. The normal equations are very large but sparse; therefore they are stored and solved using sparse matrix technique. In a test area (0°N~60°N, 50°W~0°W), the crossover residuals are reduced from 62.1m to 32.8m, and the quality of the DE...

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