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921.
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Wolf Tietze Gerhard Kortum W. R. Mead T. K. Poiker C. Paddick George Kish A. Njøs H. Mensching V. Haarmann Uzo M. Igbozurike M. M. Yoshino Mushtaqur Rahman Lage Wahlström J. Connell Kazimierz Dziewonski Wayland R. Swain J. Humlum G. W. Lüttig Haruko Kishimoto Mai Britt E. Mørk 《GeoJournal》1982,6(3):270-280
924.
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926.
K. Söderström S. Lindstam S. Behrnetz K. Kristiansson 《Astrophysics and Space Science》1973,21(1):211-222
The charge composition of the cosmic radiation for the elements withZ14 has been studied in a stack of nuclear emulsions exposed at Fort Churchill in July 1967. Particles stopping in the stack have been measured with a nuclear track photometer to determine the charge. Relative abundances are given for the elements silicon to nickel and comparison is made with other investigations. 相似文献
927.
928.
W. Köhnlein 《Planetary and Space Science》1980,28(3):225-243
An empirical model of thermospheric temperature (T∞T120, and s) and composition (H, He, N, O, N2, O2, and Ar) was derived from measurements of 8 satellites (AE-C, AE-E, AEROS-A, AEROS-B, ARIEL-3, ESRO-4, OGO-6, and SAN MARCO-3) and 4 incoherent scatter stations (Arecibo, Jicamarca, Millstone Hill, and St Santin). The altitude covered extends from 120 km up to about 600 km over the time period 1967 to 1976. The analytical framework used in the model resembles closely the MSIS setup: time independent terms, solar flux terms, geomagnetic activity (Kp) effect, annual (semiannual) and diurnal (semidiurnal, terdiurnal) variations, longitudinal terms, the U.T. effect, and corrections compensating for deviations from diffusive equilibrium at altitudes below 200 km. The model describes quiet to medium disturbed geomagnetic conditions (Kp ? 4) at solar fluxes (10.7cm) ranging from 60 to 180 × 10?22 Wm?2Hz?1. To get an impression of the accuracy presently obtained, the model is compared with MSIS, Jacchia (1977), and the models of Thuillier (T∞ and Engebretson (N). The best agreement is found for the temperature and the constituents He, O, and N2 with increasing deviations in the order of H, N, Ar, and O2. 相似文献
929.
930.
Prof. Dr. Bernd Andreae 《GeoJournal》1978,2(3):203-214
It has been made clear that the minimum cost combination in agriculture varies greatly from country to country and must change considerably from phase to phase in the course of national economic development. The criteria according to which the minimum cost combinations of the different developing countries tend to change vary greatly, depending on whether the countries in question were initially sparsely or densely populated. It also follows that in developing countries with varying economic structures the technical progress made will also vary in importance. It is easy to see from what has been said that progress in the mechanical field will be of greatest profit to thinly populated agricultural countries, while the future development of overpopulated agricultural countries will receive most benefit from progress in the field of organic sciences. 相似文献