排序方式： 共有48条查询结果，搜索用时 756 毫秒
41.
G. G. C. Palumbo N. Mandolesi G. Morigi G. A. Baird T. Delaney W. P. S. Meikle R. W. P. Drever J. V. Jelley J. H. Fruin R. B. Partridge 《Astrophysics and Space Science》1978,54(2):355-363
Between 1972 and 1975 an international collaborative search was carried out for prompt 10 GHz emission at the onset of supernovae. The motivations and techniques involved in this effort are described, and the results of the three years' work are summarized. No pulses from supernovae were detected, the best upper limit being 4×1043 ergs in a 40 MHz band at 10 GHz for a pulse time-scale 0.5 s. Methods for improving this limit are briefly described. 相似文献
42.
Relative motion of the Adriatic with respect to the confining plates: seismological and geodetic constraints 总被引：3，自引：0，他引：3
43.
Sara Picone Francesca Alvisi Enrico Dinelli Caterina Morigi Alessandra Negri Mariangela Ravaioli Carmela Vaccaro 《第四纪科学杂志》2008,23(5):489-501
Sedimentological, geochemical and micropalaeontological data from sediment cores in the northwestern Adriatic Sea were obtained to reconstruct the stratigraphic framework and palaeogeographic setting during the last post‐glacial sea‐level rise (14000–6000 yr BP). Four lithostratigraphic units were identified: (a) distal plain deposits (>14000 yr BP), submerged during the first phases of marine ingression; (b) coastal lagoon system; (c) barrier‐lagoon system, which is dated back to between 10019 ± 61 and 10228 ± 174 cal. yr BP from 14C dating on peat and shell remains; (d) marine prodelta deposits (<5500 yr BP). Geochemical data allow the identification of three distinct sediment sources: River Po, River Adige and Eastern Alpine rivers characterised by decreasing Ni/Mg ratios (50–70, 8–15 and 5–10, respectively) and Ba/Al ratios of 45–55, 55–65 and 35–45, respectively. The three sources display different relative abundances in time. During the Lateglacial, the Po is the main sediment source for the southern cores, whereas the Eastern Alps and the River Adige are the main sediment sources for the northern cores. This suggests a northern position of the Po River bed compared to previous studies. Coastal drowning led to a homogenization of the provenance signal within the sediments. Only after the marine transgression does a River Po signal appear in the northern cores. At the same time, in the southern cores the signal of Eastern Alpine rivers becomes stronger. Transgressive barrier‐lagoon and recent sediments do not display a predominant signal for provenance indicators. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
44.
F. S. Delli Santi F. Delpino P. Inzani G. Sironi N. Mandolesi G. Morigi 《Astrophysics and Space Science》1981,76(2):385-389
An experiment has been performed at 325 MHz, with a 10 m tracking dish, for the search of pulsed radio emission associated with X-ray pulsars. No evidence of radio pulses has been found in the four sources investigated, although the radio pulsar PSR 0329+54, used as a testing object, has been detected successfully. 相似文献
45.
S. Cortiglioni N. Mandolesi G. Morigi A. Ciapi P. Inzani G. Sironi 《Astrophysics and Space Science》1981,75(1):153-161
An automated station for the detection of radio bursts at 151 and 408 MHz has been operating at Medicina (Italy) since 1976. Radio data associated with 32 gamma-ray bursts, detected between July 1976 and April 1979, have been analysed. The results will be discussed in the present paper.Paper presented at the Symposium and Workshop on Gamma-Ray Bursts, Toulouse, France, 26–29 November, 1979. 相似文献
46.
Stefano Calcaterra Claudio Cesi Caterina Di Maio Piera Gambino Katia Merli Margherita Vallario Roberto Vassallo 《Natural Hazards》2012,61(1):257-266
This paper reports experimental data on surface and deep displacements evaluated by means of GPS stations and inclinometers
in two rototranslational deep landslides in a clayey slope of the Italian Southern Apennines. The displacements of the landslides
cause continuous damage to buildings and infrastructures. To study these phenomena and control their effects, the local public
administration provided financial support for a geotechnical investigation that started in 2004. Laboratory tests, in situ
pore pressure and inclinometer measurements were carried out. In July 2006, systems of fixed-in-place inclinometer probes
with continuous data acquisition were installed in two of the eleven guide casings, in correspondence to the slip surfaces
detected by previous periodical measurements. In the meanwhile, a GPS network was installed, consisting in six permanent stations
and ten non-permanent ones. Among the latter, five were installed on the top of five inclinometer casings. The experimental
results show that, in the case under study, the surface displacements evaluated by means of the GPS stations are consistent
with the surface displacements evaluated by means of the inclinometer measurements. This implies mutual data validation, availability
of considerable amount of continuous data, as well as monitoring continuity when, for some reason, one of the instruments
goes out of use. 相似文献
47.
Asbestos and other fibrous minerals contained in the serpentinites of the Gimigliano-Mount Reventino Unit (Calabria,S-Italy) 总被引：1，自引：1，他引：0
Andrea Bloise Teresa Critelli Manuela Catalano Carmine Apollaro Domenico Miriello Alessandro Croce Eugenio Barrese Francesca Liberi Eugenio Piluso Caterina Rinaudo Elena Belluso 《Environmental Earth Sciences》2014,71(8):3773-3786
Serpentinites are metamorphic rocks with good technological properties and valuable ornamental characteristics, which have been exploited since ancient times. Actually, their use is limited and monitored in several countries worldwide because they can contain fibrous asbestos minerals that may be carcinogenic. Furthermore, certain types of fibrous minerals can be confused with asbestos, and must therefore be carefully investigated. We have investigated the possible presence of the asbestos and non-asbestos fibrous phases contained in serpentinitic rocks in a meta-ophiolitic sequence from the Gimigliano-Mount Reventino Unit (Southern Italy), which had not been previously assessed. The detection and quantification of asbestos and the correct distinction of the fibrous non-asbestos minerals are very important not only from a scientific point of view, but also from a legislative one. This is especially the case for the administrative agencies that have to take decisions with regards to the implementation of public and occupational health protection measures (e.g., in road yards and quarry excavations). As a consequence of this, serpentinitic rock samples have been characterized in detail through X-ray powder diffraction, scanning and transmission electron microscopy combined with energy-dispersive spectrometry, analytical electron microscopy (SEM–EDS and TEM–AEM), differential scanning calorimetry, thermogravimetry and micro-Raman spectroscopy. Two kinds of asbestos and four kinds of non-asbestos fibrous silicates have been detected in the examined samples. In order of decreasing abundance these are polygonal serpentine, chrysotile, fibrous antigorite, tremolite, gedrite and magnesiohornblende. The size, morphology, crystallinity and chemical composition of the fibres were also discussed, in the light of the possible role these properties could play in the carcinogenic effect on human health. 相似文献
48.
Dario Camuffo Caterina Secco Peter Brimblecombe Javier Martin-Vide 《Climatic change》2000,46(1-2):209-223
Data regarding the frequency andoccurrence of sea storms in the Adriatic Sea and theWestern Mediterranean during the last millennium havebeen extracted from historical written sources. TheAdriatic Sea shows two anomalous periods of high stormfrequency: the first half of the 1500s and the secondhalf of the 1700s. In the 1500s the storms were morefrequent in autumn, while in the late 1700s theyoccurred at high frequency in winter. In the WesternMediterranean, storms had a higher frequency in thefirst half of the 1600s, with two lesser periods ofhigh frequency in the 1400s and at the end of the1700s. Although both records show a maximum frequencyof sea storms during the Spörer Minimum(1416–1534) of solar activity, sunspot series yieldno, or poor, correlation during the other periods oflowest activity, i.e., Oort Minimum (1010–1090), WolfMinimum (1282–1342), and Maunder Minimum (1645–1715),suggesting that a teleconnection between sea stormsand sunspots is improbable or masked in this region.No teleconnection was found either between the ElNiño-Southern Oscillation (ENSO) and surgesflooding Venice or the Western Mediterranean storms orbetween Venice surges and the Northern AtlanticOscillation (NAO). 相似文献