4599858 Ocean wave energy device     

Joseph P. La Stella  Michael G. Tornabene 《Ocean Engineering》1987,14(1)

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The spectrum and position of solar noise storms at decameter wavelengths     

Jérôme De La Noë  Tomas E. Gergely 《Solar physics》1977,55(1):195-209

Decametric storm radiation during the period July–August 1970 has been observed simultaneously with a high sensitivity spectrograph at Arecibo Observatory and with the log-periodic, swept-frequency array of the Clark Lake Radio Observatory. The observations complement each other; different types of fine structure emissions can be easily identified on the spectrograph records and their position can be determined from the swept-frequency recordings. We study the relative positions of the different emissions which have been observed during the storms. Four distinct sources appeared to be present. The continuum emission, the type I bursts and the flare-related type III's were all emitted at different locations. The storm type III bursts, type IIIb's and drift pairs overlapped in position, but appeared at different locations than the previously mentioned sources.On leave of absence from Instituto Argentino de Radioastronomia, Argentina.  相似文献   

Umbral dots: A case of penetrative convection between sunspot fragments     

J. I. García De La Rosa 《Solar physics》1987,112(1):49-58

A study of the observations made on the development and, in some cases, even the decay of 15 large active regions is presented. It is shown that the mature spots result from the subphotospherically controlled attraction of several large fragments of 1–2 × 10²¹ Mx, which are themselves made of smaller elements. The fragments are more stable structures than the spots they constitute; and usually survive after the spot decay. In the process of coalescence of fragments to form the spot, the fusion is never complete and properly exposed photographs reveal light bridges or saddle-like distributions of umbral dots in the interstices between fragments. These are also the regions along which the break up of the spot occurs. For us, these observations fit within the expectations of the penetrative convection mechanism for umbral dots proposed by Parker (1979b).  相似文献   

Sunspot populations and their relation with the solar cycle     

J. I. García De La Rosa 《Solar physics》1981,74(1):117-123

The joint consideration of theoretical and observational arguments is used to conclude that two different spot populations co-exist in the Sun.Proceedings of the 14th ESLAB Symposium on Physics of Solar Variations, 16–19 September 1980, Scheveningen, The Netherlands.  相似文献   

Volcanic hazards at Fossa of Vulcano: Data from the last 6,000 years     

G. Frazzetta  P. Y. Gillot  L. La Volpe  M. F. Sheridan 《Bulletin of Volcanology》1984,47(1):105-124

Stratigraphic reconstruction of the complete sequence of deposits that formed the Fossa cone of Vulcano has distinguished four principal eruptive cycles: Punte Nere, Palizzi, Commenda, and Pietre Cotte. At least three additional eruptive cycles, one of which ends with the Campo Sportivo lava, occur between deposits of the Punte Nere and Palizzi cycles. However, exposure is inadequate for their characterization. The assignment of the modern deposits that follow the Pietre Cotte lava is uncertain.Deposits of each cycle follow a similar stochastic pattern that is controlled by a decrease in the effect of water/melt interaction. The normal sequence of pyroclastic products for each cycle starts with wet-surge beds, followed by dry-surge horizons, fall deposits, and finally lava flows. Absolute age determinations have been made on each cycle-ending lava flow.Wet-surge deposits normally occur near the crater rim, whereas dry-surge deposits are more widespread, reaching the surrounding caldera wall in many places. Thick fall deposits are confined to a zone extending about 800 m from the crater rim. Lava flows normally reach the base of the cone. The greatest hazard at Fossa is related to surge eruptions. The thickness of dry-surge deposits on the flanks of the cone increases away from the crater, but they pinch out toward the source near the crater rim. SEM analysis of the surface textures of juvenile glass clasts from dry-surge deposits confirms that the dominant control on the eruptive mechanism is water/melt interaction. Only slight modifications are induced on grain surfaces during transport. Particles from the Palizzi dry-surge beds lack surface textures characteristic of fall pyroclasts which suggests that ballistic fragments were not incorporated into the dense portion of the turbulent surge cloud. A quantitative analysis of the dispersal of products from the Palizzi cycle allowed creation of a computer-generated map for this eruption.Paper presented at the IUGG Inter-disciplinary Symposium on Volcanic Hazard, Hamburg, August 1983.  相似文献   

НЕКОТОРЫЕ СВЯЗЫ ЭЛЕКТРИЧЕСКИХ ПАРАМЕТРоВ ГОРНЫХ ПОРоД И ИХ ХИМИЧЕСКОГО СОСТАВА     

Marcela Laštovičková  Karel Svoboda  Рецензенm A. Janáčková 《Studia Geophysica et Geodaetica》1986,30(2):211-213

au aa ¶rt;a, nuau uuu ma n¶rt; u m muu uu, n¶rt; m¶rt;a nm (). u a m u ¶rt; uuu ma u muuu uuau.

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Summary Analysis of the data set describing the chemical composition of the rocks and their electrical parameters was performed by the principal component method. Some relations between chemical composition and electrical parameters were established.

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The Southern Oscillation,environmental anomalies,and mortality of two Southern African seabirds     

Graeme D. La Cock 《Climatic change》1986,8(2):173-184

Mass mortalities and breeding failures of seabirds in the Pacific Ocean have been directly or indirectly linked to local manifestations of the Southern Oscillation. Similar seabird mortalities have been reported in the Benguela upwelling system along the southern African coast. A Boolean factor analysis of binary data (occurrence vs. non-occurrence) showed that certain worldwide and southern African anomalous climatic events tended to co-occur in the same year, and that seabird mortalities and scarcities of small fish along the southern African coast occurred in either the same year, or the year before, the anomalous climatic events. The environmental conditions leading up to warm-water events in southern Africa appear as detrimental to seabird populations as the warm-water events themselves.  相似文献   

Time patterns of polarization currents generated in measuring the electrical conductivity of rocks     

Josef Bochníček  Marcela Laštovičková  Reviewer A. Janáčková 《Studia Geophysica et Geodaetica》1982,26(4):412-415

amamuu aau m¶rt;a uu mn¶rt;mu n¶rt; nu u mnama, m num , naa, m uau nuau nmu um a mam uu.  相似文献   

Heavy metals in the Tiber river basin     

M. Pettine  T. La Noce  G. Macchi  F.J. Millero 《Marine pollution bulletin》1982,13(9):327-329

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On the disappearance of the imf sector structure effect in the lower atmosphere in 1974–1977     

Jan Laštovička  Reviewer L. Křivský 《Studia Geophysica et Geodaetica》1981,25(2):208-210

1974–1977. aum n mun ma nu mau nam aum n, a¶rt;a anu aum amumu, m, m a¶rt;am u u am, nmu uam. ¶rt;am uuu nuu m uu.  相似文献