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  • 1
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    Ionospheric scintillation monitoring and modelling (2009)
    Editrice Compositori
    Details
    Publication Date: 2021-05-17
    Description: This paper presents a review of the ionospheric scintillation monitoring and modelling by the European groups involved in COST 296. Several of these groups have organized scintillation measurement campaigns at low and high latitudes. Some characteristic results obtained from the measured data are presented. The paper also addresses the modeling activities: four models, based on phase screen techniques, with different options and application domains are detailed. Finally some new trends for research topics are given. This includes the wavelet analysis, the high latitudes analysis, the construction of scintillation maps and the mitigation techniques.
    Description: Published
    Description: 391-416
    Description: 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
    Description: JCR Journal
    Description: open
    Keywords: scintillation ; measurement campaigns ; phase screen models ; radar ; wavelets ; maps ; 01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics ; 01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation ; 01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations ; 01. Atmosphere::01.03. Magnetosphere::01.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Long-term trends in the ionosphere and upper atmosphere parameters (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: The first part of the paper is directed to the investigation of the practical importance of possible longterm trends in the F2-layer for ionospheric prediction models. Using observations of about 50 different ionosonde stations with more than 30 years data series of foF2 and hmF2, trends have been derived with the solar sunspot number R12 as index of the solar activity. The final result of this trend analysis is that the differences between the trends derived from the data of the individual stations are relatively large, the calculated global mean values of the foF2 and hmF2 trends, however, are relatively small. Therefore, these small global trends can be neglected for practical purposes and must not be considered in ionospheric prediction models. This conclusion is in agreement with the results of other investigations analyzing data of globally distributed stations. As shown with the data of the ionosonde station Tromsø, however, at individual stations the ionospheric trends may be markedly stronger and lead to essential effects in ionospheric radio propagation. The second part of the paper deals with the reasons for possible trends in the Earth’s atmo- and ionosphere as investigated by different methods using characteristic parameters of the ionospheric D-, E-, and F-regions. Mainly in the F2-region different analyses have been carried out. The derived trends are mainly discussed in connection with an increasing greenhouse effect or by long-term changes in geomagnetic activity. In the F1-layer the derived mean global trend in foF1 is in good agreement with model predictions of an increasing greenhouse effect. In the E-region the derived trends in foE and h´E are compared with model results of an atmospheric greenhouse effect, or explained by geomagnetic effects or other anthropogenic disturbances. The trend results in the D-region derived from ionospheric reflection height and absorption measurements in the LF, MF and HF ranges can at least partly be explained by an increasing atmospheric greenhouse effect.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: 01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 980281 bytes
    Format: application/pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of Uranium and Beryllium in Fused Fluoride Systems (1959)
    s.l. : American Chemical Society
    Analytical chemistry 31 (1959), S. 1081-1084 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60150a004
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Radiochemical Separation of Actinium and Its Daughters by Means of Lead Sulfate (1955)
    s.l. : American Chemical Society
    Analytical chemistry 27 (1955), S. 2009-2012 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60108a052
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of Rare-Earth Element Data Obtained by Neutron Activation Analysis Using International Rock and Multielement Solution Standards (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 3 (1979), S. 0 
    Details
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The authors have used a high-purity multielement solution, containing known quantities of individual Pare earth elements, as a reference standard in neutron activation analysis of rare earths in several international standard rocks. The data obtained by the authors have been compared with those obtained using the international standard rock Basalt BCR-1 as a reference material. The authors’data compare favourably with those obtained by other workers, particularly for the more basic rock types, and encourages the authors to suggest that a multielement solution standard can be used successfully for neutron activation analysis of rave earth elements. High values obtained for Ce in Basalt BCR-1, however, might indicate that the behaviour of Ce in solution needs further investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-908X.1979.tb00242.x
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  • 6
    Electronic Resource
    Electronic Resource
    Depleted and Fertile Mantle Xenoliths from Southern African Kimberlites (1981)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Earth and Planetary Sciences 9 (1981), S. 285-309 
    Details
    ISSN: 0084-6597
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ea.09.050181.001441
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  • 7
    Electronic Resource
    Electronic Resource
    The inner city: In search of the problem
    Amsterdam : Elsevier
    Geoforum 10 (1979), S. 109-116 
    Details
    ISSN: 0016-7185
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geography
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0016-7185(79)90016-2
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  • 8
    Electronic Resource
    Electronic Resource
    EFFECTS OF PHOSPHODIESTERASE INHIBITORS ON CYCLIC AMP LEVELS AND ON LIPOLYSIS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 185 (1971), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1971.tb45243.x
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  • 9
    Electronic Resource
    Electronic Resource
    The geochemistry of potassic lavas from Vulsini, central Italy and implications for mantle enrichment processes beneath the Roman region (1985)
    Springer
    Contributions to mineralogy and petrology 90 (1985), S. 244-257 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Major and trace element and 143Nd/144Nd (0.51209–0.51216) and 87Sr/86Sr (0.70879–0.71105) isotope analyses are presented on a representative group of lavas from the Vulsini district of the Roman magmatic province. Three distinct series are identified; the high-K and low-K series are similar to those described from other Italian volcanoes, while the third is represented by a group of relative ly undifferentiated leucite basanites which are thought to be near-primary mantle melts. Major and trace element variations within the high-K series are consistent with fractional crystallisation from a parental magma similar to the most magnesian leucitites. Crustal contamination resulted in an increase in 87Sr/86Sr with increasing fractionation, but it was superimposed on magmas which had already inherited a range of incompatible element and isotope ratios from enrichment processes in the sub-continental mantle. These are reviewed using the available results from Vulsini, Roccamonfina and Ernici. Transition element abundances and Ta/Yb ratios indicate that the pre-enrichment mantle was similar to that of E-type MORB, and that these elements were not mobilised by the enrichment process. Mixing calculations suggest that three components were involved in the enrichment process; mantle comparable with the source of MORB, and two other components rich in trace elements. One, the low-K component, had high Sr/Nd, Th/Ta and Ba/Nb and no europium anomaly while the second had lower Sr/Nd, a negative europium anomaly and very high Th/Ta. It was also characterised by low Nb/Ba and high Rb/Ba ratios, similar to those reported from phlogopite-rich peridotite xenoliths. The trace element enrichment processes are therefore thought to have occurred in the mantle wedge above a subduction zone with the trace element characteristics of the high-K end-member reflecting the subduction of sediments and the stabilisation of mantle phlogopite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378265
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  • 10
    Electronic Resource
    Electronic Resource
    Geochemistry of the Boil Mountain ophiolitic complex, northwest Maine, and tectonic implications (1987)
    Springer
    Contributions to mineralogy and petrology 97 (1987), S. 51-65 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A coherent ophiolitic complex of pyroxenite, serpentinite, metagabbro, mafic volcanics, felsic volcanics and sediments crops out in NW Maine, adjacent to the Chain Lakes massif. The complex (here informally referred to as the Boil Mountain ophiolitic complex) is about 500 m.y. old. The volcanic sequence is not typical of ophiolites in that it contains a large proportion of felsic volcanics. The mafic volcanics are divided into two geochemical groups. A stratigraphically lower group is depleted in Ti, Zr, Y, Cr and REE contents similar to basalts from supra-subduction zone ophiolites. An upper mafic group has trace element contents similar to normal mid-ocean ridge basalts. The felsic volcanics are mostly rhyolitic and similar to low-K rhyolites found in the forearc of the Marianas trench and in an island arc sequence in the Klamath Mountains, California. The flat REE patterns of the felsic volcanic rocks are similar to those found in siliceous rocks in the Oman ophiolite. The presence of thick sequences of felsic volcanics, the abundance of pyroxenite, the low Ti, Zr and REE contents of some mafic rocks, the flat REE patterns of the felsic volcanics, and the composition of clinopyroxene all suggest the complex was formed in the vicinity of a subduction zone. The complex may be correlated with ophiolitic fragments in the eastern part of the Dunnage Zone in Newfoundland, rather than the main ophiolite belt of the western Appalachians.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00375214
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