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61.
Dyfrig Jones 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1981,1(2):103-106
Porcupine sounding rockets launched from Kiruna in March 1979 carried comprehensive payloads of field, wave and particle experiments. In addition, Xenon ion sources on an ejectable package separated from the main payload during flight. The effects of the Xe+ beam as detected by the LF (f<16 kHz) wide-band electric field experiment are discussed. Of particular interest is the stimulation by the Xenon ions of ion-cyclotron harmonic waves covering the whole frequency range up to 16 kHz. These waves are usually linked to the local proton gyro-frequency but occasionally they are related to half that frequency. A possible generation mechanism based on the excitation of waves in the presence of a light minor ion is suggested. 相似文献
62.
D. Jones 《Space Science Reviews》1978,22(4):327-332
The wave experiment on GEOS-1 is a cooperative enterprise involving six different European Institutes. The principle of this complex experiment is described, and the sensitivities attained for measuring electric and magnetic fields in the frequency range DC — 80 kHz are presented. 相似文献
63.
F.W. Taylor J.J. Barnett I. Colbeck R.L. Jones C.D. Rodgers M.J. Wale E.J. Williamson 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1981,1(4):261-265
The design and performance of SAMS, an infrared limb-scanning instrument for sounding the temperature and composition of the atmosphere from 15 to 150 km altitude, are reviewed. Some examples of preliminary results on temperature and water vapour and nitrous oxide abundance versus latitude and height are presented. 相似文献
64.
R.L. Jones 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1984,4(4):121-130
The stratospheric and mesospheric sounder (SAMS) was launched in October 1978 on the NIMBUS 7 satellite. Between then and its eventual failure in June 1983 the instrument was used to collect over four years of radiance data from which atmospheric temperature and the abundances of a number of minor constituents have been derived. The paper will present fields of CH4 and N2O between 50S and 70N derived from SAMS data for the period 1979–1981. Global distributions of CH4 and N2O will be presented in various forms and the observed seasonal changes and interannual variability will be described. The paper will compare the SAMS CH4 and N2O data with model predictions and will comment upon some other areas of interest. 相似文献
65.
W. Forman C. Jones 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1982,2(9):203-211
The X-ray imaging capability of the Einstein Observatory has provided new observational material in many branches of astrophysics. In this contribution we will review the implications of the X-ray observations for the classification of clusters, the formation of SO galaxies, and the interaction of the galaxies with the intracluster gas. 相似文献
66.
S.F. Martin R.D. Bentley A. Schadee A. Antalova A. Kucera L. Dezső L. Gesztelyi K.L. Harvey H. Jones S.H.B. Livi J. Wang 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1984,4(7):61-70
Some sites for solar flares are known to develop where new magnetic flux emerges and becomes abutted against opposite polarity pre-existing magnetic flux (review by Galzauskas/1/). We have identified and analyzed the evolution of such flare sites at the boundaries of a major new and growing magnetic flux region within a complex of active regions, Hale No. 16918. This analysis was done as a part of a continuing study of the circumstances associated with flares in Hale Region 16918, which was designated as an FBS target during the interval 18 – 23 June 1980. We studied the initiation and development of both major and minor flares in Hα images in relation to the identified potential flare sites at the boundaries of the growing flux region and to the general development of the new flux. This study lead to our recognition of a spectrum of possible relationships of growing flux regions to flares as follows: (1) intimate interaction with adjacent old flux — flare sites centered at new/old flux boundary, (2) forced or “intimidated” interaction in which new flux pushes old field having lower flux density towards a neighboring old polarity inversion line where a flare then takes place, (3) “influential” interaction — magnetic lines of force over an old polarity inversion line, typically containing a filament, reconnect to the new emerging flux; a flare occurs with erupting filament when the magnetic field overlying the filament becomes too weak to prevent its eruption, (4) inconsequential interaction — new flux region is too small or has wrong orientation for creating flare conditions, (5) incidental — flare occurs without any significant relationship to new flux regions. 相似文献
67.
Van Rheeden D.R. Jones R.A. 《IEEE transactions on aerospace and electronic systems》1988,24(2):177-185
An investigation of errors due to noise in centroid tracker aim-point estimation is presented. The centroid tracker discussed is similar to the tracker described by A.L. Gilbert et al. (1980). Simplifications to this algorithm were made so that the derived models would be consistent with the actual tracker algorithm. Two statistical models are derived which relate image noise effects to computation of the target centroid. The first model, the simplified aim-point error model, is derived by assuming that the probabilities of incorrectly classifying target and background pixels are equal. The second model, the extended aim-point error model, is derived by assuming that the probability of incorrectly classifying a target pixel can differ from the probability of incorrectly classifying a background pixel. These models are described and their mathematical implication is discussed. Simulation results which verify the models are presented 相似文献
68.
钟思敏(Jones&Shipman)公司是英国仅剩的批量生产磨床的企业,其平面磨床Ultramat是钟思敏公司专为航空、汽车工业开发的能适合从单件,小批量到大批量生产多种不同加工需要的高档万能机床. 相似文献
69.
Planar magnetic structures are regions of the solar wind where the magnetic field is oriented parallel to a fixed plane for
several hours or more. Discontinuities in the field direction may be encountered during these periods, their surfaces also
being parallel to the plane containing the field. A survey of Ulysses magnetic field data returned during 1990–1998 revealed that the solar wind's magnetic field was planar in nature for at least
9% of the time. A survey is presented of planar magnetic structures encountered by Ulysses during two periods when the spacecraft was travelling south from the ecliptic to high southern heliographic latitudes, in
1992–1994 and 1998–2000. The characteristics of the planar magnetic structures encountered during these times of declining
and near-maximum solar activity are described, as well as their apparent relationships with interplanetary shocks and heliospheric
current sheet crossings. Planar magnetic structures are more common near solar maximum. However, the proportion of structures
coinciding with HCS crossings and shocks seems relatively constant.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
70.
Florian A. Twaroch Paul D. Clough Christopher B. Jones Robert C. Pasley Sue Mansbridge 《Spatial Cognition & Computation》2019,19(2):146-171
People often communicate with reference to informally agreed places, such as “the city centre”. However, views of the spatial extent of such areas may vary, resulting in imprecise regions. We compare perceptions of Sheffield’s City Centre from a street survey to extents derived from various web-based sources. Such automated approaches have advantages of speed, cost and repeatability. We show that footprints from web sources are often in concordance with models derived from more labour-intensive methods. Notable exceptions however were found with sources advertising or selling residential property. Agreement between sources was measured by aggregating them to identify locations of consensus. 相似文献