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  • 1
    Electronic Resource
    Electronic Resource
    Modeling and digital nonlinear control of active magnetic bearing (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4931-4931 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the first part of the paper we propose a complete nonlinear dynamic model of a magnetic bearing. The bearing is made up to two controlled axes and three passive axes. This model takes into account the changeover of the power between the two coils of each controlled axis in order to control each axis without exciting currents. In this case, the model is not linear anymore. In the second part we compute a linear regulator taking into account the nonlinearity of the model. For that, we use the "describing function approach'' (the nonlinearity is approximated by a complex gain which is a function of the magnitude of the input signal). The stability of the control is assumed first by using the frequency response of the linear part of the model and second by using the describing function of the nonlinearity. In the third part, the regulator is implemented on a digital computer with a sampling period of 0.4 ms. The matching between simulation results and experimental trials shows the accuracy of both the model and the control. Trials on the plant show the good performances of the control law especially during the crossing of critical frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348179
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of plasma renin activity in the freshwater turtle
    Amsterdam : Elsevier
    General and Comparative Endocrinology 70 (1988), S. 442-449 
    Details
    ISSN: 0016-6480
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0016-6480(88)90120-7
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An integrated approach to the synthesis of contiguously substituted xanthopurpurins, pachybasins and purpurins.
    Amsterdam : Elsevier
    Tetrahedron 49 (1993), S. 771-784 
    Details
    ISSN: 0040-4020
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4020(01)80322-7
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Regiospecific α-substitution of crotonic esters synthesis of naturally occurring derivatives of 6-ethyljuglone
    Amsterdam : Elsevier
    Tetrahedron 47 (1991), S. 4287-4298 
    Details
    ISSN: 0040-4020
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4020(01)87099-X
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Report of a Single-Institution Experience Using the EVT Endovascular Abdominal Aortic Aneurysm Graft in 25 Patients (1999)
    Springer
    Annals of vascular surgery 13 (1999), S. 60-66 
    Details
    ISSN: 1615-5947
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100169900221
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  • 6
    Electronic Resource
    Electronic Resource
    Anesthetic Methods in Reoperative Carotid Surgery (1998)
    Springer
    Annals of vascular surgery 12 (1998), S. 163-167 
    Details
    ISSN: 1615-5947
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100169900135
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  • 7
    Electronic Resource
    Electronic Resource
    Causes of the Increased Stroke Rate after Carotid Endarterectomy in Patients with Previous Strokes (1997)
    Springer
    Annals of vascular surgery 11 (1997), S. 28 -34 
    Details
    ISSN: 1615-5947
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: n = 183) were compared to those who were either asymptomatic or experienced only transient ischemic attacks (TIAs) preoperatively (n= 423). Of the 183 patients who had suffered preoperative strokes, eight patients who experienced perioperative strokes after endarterectomy were compared with 175 who successfully underwent surgery. Patients with a prior stroke had an increased perioperative stroke rate (4.4% versus 1.2%, p= 0.01). They had a significantly higher incidence of hypertension (62.6% versus 47.9%, p 〈 0.001), cardiac disease (54.7% versus 40.7%, p= 0.001), and positive smoking history (52% versus 40.6%, p= 0.01) than did the asymptomatic/TIA patients. The presence of contralateral total occlusion was also significantly increased (22% versus 10.3%, p 〈 0.001). Although not statistically significant due to the overall small number of patients who sustained perioperative strokes, the preoperative stroke patients who sustained perioperative strokes had a higher incidence of hypertension (87.5% versus 61.5%) and contralateral total occlusion (37.5% versus 21.3%) than did those who successfully underwent surgery. Patients with both a prior stroke and contralateral total occlusion had a 7.5% perioperative stroke rate. Patients with both a prior stroke and hypertension had a 6.1% perioperative stroke rate. The perioperative strokes in patients with prior strokes were not related to the severity of the prior stroke, the interval between the stroke and surgery, the use of a shunt, or the type of anesthesia employed. Patients who have sustained preoperative strokes have a higher incidence of significant medical illnesses and overall cerebrovascular disease. Hypertension and total occlusion of the contralateral carotid artery appear to be particularly poor prognostic indicators of outcome after endarterectomy in these patients. Patients who have sustained preoperative strokes may be more likely to display clinical neurologic symptoms in response to any form of cerebral ischemia. In this higher risk subgroup, intraoperative and surgeon-dependent factors appear to play less of a role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100169900006
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  • 8
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    Tephrostratigraphy, chronology and climatic events of the Mediterranean basin during the Holocene: An overview (2012)
    SAGE Publications
    Details
    Publication Date: 2017-04-04
    Description: The identification and characterisation of high-frequency climatic changes during the Holocene requires natural archives with precise and accurate chronological control, which is usually difficult to achieve using only 14C chronologies. The presence of time-spaced tephra beds in Quaternary Mediterranean successions represents an additional, independent tool for dating and correlating different sedimentary archives. These tephra layers are potentially useful for resolving long-standing issues in paleoclimatology and can help towards correlating terrestrial and marine paleoclimate archives. Known major tephras of regional extent derive from central and southern Italy, the Hellenic Arc, and from Anatolia. A striking feature of major Holocene tephra deposition events in the Mediterranean is that they are clustered rather than randomly distributed in time. Several tephra layers occurred at the time of the S1 sapropel formation between c. 8.4 and 9.0 ka BP (Mercato, Gabellotto-Fiumebianco/E1, Cappadocia) and other important tephra layers (Avellino, Agnano Monte Spina, ‘Khabur’ and Santorini/Thera) occurred during the second and third millennia BC, marking an important and complex phase of environmental changes during the mid- to late-Holocene climatic transition. There is great potential in using cryptotephra to overlap geographically Italian volcanic ashes with those originating from the Aegean and Anatolia, in order to connect regional tephrochronologies between the central and eastern Mediterranean.
    Description: Published
    Description: 33-52
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: JCR Journal
    Description: reserved
    Keywords: Holocene ; Mediterranean basin ; paleoclimate ; tephrochronology ; tephrostratigraphy ; 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects ; 03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology ; 04. Solid Earth::04.04. Geology::04.04.02. Geochronology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Late Pleistocene to Holocene tephrostratigraphic record from the Northern Ionian Sea (2012)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: A detailed tephrostratigraphic study supported by stable isotope (δ18O) analyses and AMS 14C dating was carried out on a high sedimentation rate deep-sea core recovered in the northern Ionian Sea. Eight tephra layers were recognised, all originated from explosive eruptions of southern Italian volcanoes. These tephra layers are correlated with terrestrial proximal counterparts and with both marine and lacustrine tephra already known in the central Mediterranean area. The oldest tephra (dated at ca. 19.4 ka cal BP) is tentatively correlated to the Monte Guardia eruption from Lipari Island. Two other rhyolitic tephra layers were correlated with the explosive volcanic activity of Lipari Island: Gabellotto-Fiumebianco/E-1 (8.3 ka cal BP) located close to the interruption of Sapropel S1 deposit, and Monte Pilato (ca. AD 1335) in the uppermost part of the core. The Na-phonolitic composition of the other five recognised tephra layers indicates the Somma-Vesuvius as the source. The composition is quite homogeneous among the five tephra layers, and fits that of the Mercato proximal deposits. Beyond the striking chemical similarity with the Mercato eruption, these tephra layers span over ca. 2000 years, preventing correlation with the single well known Plinian eruption of the Somma-Vesuvius. Therefore, at least two of these tephra layers were assigned to an interplinian activity of the Somma-Vesuvius between the eruptions of Mercato and Avellino, even though these eruptions remains poorly constrained in the proximal area. By contrast, the most prominent tephra layer (2 mm white tephra visible at naked eyes) was found within the S1a Sapropel interval. Despite the possible complication for the presence of similar eruption with different ages we argue that Mercato is probably a very good marker for the onset of sapropelic condition in the Ionian Sea and can be used for land-sea correlations for this important climatic event. More in general, these data allow a significant update of the knowledge of the volcanic ash dispersal from Lipari and Somma-Vesuvius volcanoes.
    Description: Published
    Description: 41-51
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: JCR Journal
    Description: restricted
    Keywords: tephrochronology ; Ionian Sea ; Somma-Vesuvius ; Mercato ; Lipari ; Gabellotto-Fiumebianco/E-1 ; Monte Pilato ; Monte Guardia ; volcano ; Italy ; 03. Hydrosphere::03.01. General::03.01.99. General or miscellaneous ; 03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
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    Unknown
    Tephrostratigraphy, chronology and climatic events of the Mediterranean basin during the Holocene: an overview (2011)
    Details
    Publication Date: 2017-04-04
    Description: The identification and characterisation of high-frequency climatic changes during the Holocene requires natural archives with precise and accurate chronological control, which is usually difficult to achieve using only 14C chronologies. The presence of time-spaced tephra beds in Quaternary Mediterranean successions represents an additional, independent tool for dating and correlating different sedimentary archives. These tephra layers are potentially useful for resolving long-standing issues in paleoclimatology and can help towards correlating terrestrial and marine paleoclimate archives. Known major tephras of regional extent derive from central and southern Italy, the Hellenic Arc, and from Anatolia. A striking feature of major Holocene tephra deposition events in the Mediterranean is that they are clustered rather than randomly distributed in time. Several tephra layers occurred at the time of the S1 sapropel formation between c. 8.4 and 9.0 ka BP (Mercato, Gabellotto-Fiumebianco/E1, Cappadocia) and other important tephra layers (Avellino, Agnano Monte Spina, ‘Khabur’ and Santorini/Thera) occurred during the during the second and third millennia bc, marking an important and complex phase of environmental changes during the mid- to late-Holocene climatic transition. There is great potential in using cryptotephra to overlap geographically Italian volcanic ashes with those originating from the Aegean and Anatolia, in order to connect regional tephrochronologies between the central and eastern Mediterranean.
    Description: In press
    Description: (21)
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: JCR Journal
    Description: reserved
    Keywords: Holocene ; Mediterranean basin ; paleoclimate ; tephrochronology ; tephrostratigraphy ; 03. Hydrosphere::03.01. General::03.01.03. Global climate models ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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