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  • Springer  (40)
  • 2005-2009  (6)
  • 1995-1999  (34)
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  • 1
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    Unbekannt
    EXAFS, magnetic, spectral, and thermal studies on a new polymeric copper mixed-valence compound with the 2-thioisoorotato bridging ligand (1998)
    Springer
    Details
    Publikationsdatum: 1998-04-01
    Print ISSN: 0022-2461
    Digitale ISSN: 1573-4803
    Thema: Maschinenbau , Physik
    Publiziert von Springer
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  • 2
    Digitale Medien
    Digitale Medien
    Characterizations based on conditional expectations of the doubled truncated distribution (1996)
    Springer
    Annals of the Institute of Statistical Mathematics 48 (1996), S. 563-572 
    Details
    ISSN: 1572-9052
    Schlagwort(e): Characterizations ; doubled truncated distribution ; conditional expectations ; mean residual life ; order statistics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The expression of the continuous distribution function F(x) is obtained whenever % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXafv3ySLgzGmvETj2BSbqefm0B1jxALjhiov2D% aebbfv3ySLgzGueE0jxyaibaiGc9yrFr0xXdbba91rFfpec8Eeeu0x% Xdbba9frFj0-OqFfea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs% 0dXdbPYxe9vr0-vr0-vqpWqaaeaabiGaciaacaqabeaadaqaaqGaaO% qaaerbhv2BYDwAHbacfiGaa8xBaiaabIcacaWG4bGaaiilaiaadMha% caqGPaGaa8hiaiaab2dacaWFGaGaa8xraiaa-HcacaWFybGaa8hiai% aa-XhacaWFGaGaa8hEaiaa-bcacqGHKjYOcaWFGaGaa8hwaiaa-bca% cqGHKjYOcaWFGaGaa8xEaiaa-Lcaaaa!53EE!\[m{\rm{(}}x,y{\rm{)}} {\rm{ = }} E(X | x \le X \le y)\]is known. Moreover, we obtain the necessary and sufficient conditions so that any function m: ℝ2 → ℝ is the conditional expectation % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXafv3ySLgzGmvETj2BSbqefm0B1jxALjhiov2D% aebbfv3ySLgzGueE0jxyaibaiGc9yrFr0xXdbba91rFfpec8Eeeu0x% Xdbba9frFj0-OqFfea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs% 0dXdbPYxe9vr0-vr0-vqpWqaaeaabiGaciaacaqabeaadaqaaqGaaO% qaaiaadweacaGGOaGaamiwaerbhv2BYDwAHbacfiGaa8hiaiaacYha% caWFGaGaa8hEaiaa-bcacqGHKjYOcaWFGaGaa8hwaiaa-bcacqGHKj% YOcaWFGaGaa8xEaiaacMcaaaa!4D0D!\[E(X | x \le X \le y)\]of a random variable X with continuous distribution function. Furthermore, we relate m(x,y) to order statistics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00050855
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  • 3
    Digitale Medien
    Digitale Medien
    Kinematics and Morphology of the Resolved Narrow Line Region in NGC 4151 (1999)
    Springer
    Astrophysics and space science 269-270 (1999), S. 431-434 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A complement of HST narrow band images, STIS slitless and long-slit spectra have been employed to probe the morphology, kinematics, dynamics, and ionization structure of the near-nuclear region in NGC 4151. The images illustrate the inner biconical cloud distribution which exhibits recessional velocities relative to the nucleus to the NE and approaching velocities to the SW of the nucleus. The STIS spectra of the NLR map the velocity field from 1.2 kpc to within 13 pc (H ° = 75 km s-1 Mpc-1) of the nucleus. We find evidence for at least two kinematic cloud populations. One is characterized by Low Velocities and Low Velocity Dispersions (LVLVD clouds: ∣v∣ 〈 400 km s-1, and Δ v 〈 130 kms-1). These clouds extend through the NLR and may be gravitationally associated with the host galaxy. Another component is characterized by High Velocities and High Velocity Dispersions (HVHVD clouds:400 〈 ∣v∣ ≲ 1700 km s-1, Δv ≥ 130 km s-1).This set of clouds is located within 1.1″ (∼ 70 pc) of the nucleus and has radial velocities which are too high to be gravitational in origin, show no strong correlation with the knots in the radio jet, but are consistent with wind driven outflow.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1017029921110
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  • 4
    Digitale Medien
    Digitale Medien
    Tourmalinites and Sn-Li mineralization in the Valdeflores area (Cáceres, Spain) (1996)
    Springer
    Mineralogy and petrology 56 (1996), S. 209-223 
    Details
    ISSN: 1438-1168
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Turmalinite, die Quarz, Li- und Cs-Glimmer, sowie geringe Mengen an Arsenkies führen, kommen in der N⇆e von Cáceres, Spanien, vor. Sie sind an ordovizische Metapelite in der Nähe des Cabeza de Araya Batholiths und kleinere tektonisierte Granitkörper gebunden. Eine epigenetische Genese der Turmalinite ist auf Grund von Feldbeziehungen und texturellen Beobachtungen belegt. Die Zusammensetzung der sehr feinkörnigen Turmaline entspricht intermediären Gliedern der Schörl-Dravit- Reihe. Hydrothermale Gänge mit Quarz, Muskowit, Amblygonit-Montebrasit, Apatit, Fluorit und/oder Zinnstein treten benachbart zu den Turmaliniten auf. Der mineralisierte Bereich ist an eine Scherzone gebunden, die während der hercynischen D3 Deformation und der Platznahme der Granite aktiv war. Turmalinite und Gänge lassen sich genetisch von magmatisch-hydrothermalen Fluiden ableiten, die mit der Intrusion eines nicht aufgeschlossenen Granitdomes zusammenhängen. Die Turmalinite sind das Produkt einer weiträumigen Metasomatose der ordovizischen Metasedimente.
    Notizen: Summary Tourmalinites containing quartz, Li- and Cs-micas, and small amounts of arsenopyrite occur near Cáceres, Spain. The tourmalinites are developed within Ordovician pelites near the eastern margin of the Cabeza de Araya batholith and close to several small bodies of tectonized granite. Field and textural relationships document an epigenetic character for the tourmalinites. The tourmaline is fine to very fine-grained and its composition is intermediate within the schorl-dravite solid-solution series. Hydrothermal veins containing quartz, muscovite, amblygonite-montebrasite, apatite, fluorite, and/or cassiterite appear spatially related to the tourmalinites. The mineralized area is located in a shear zone that was active during D3 Hercynian deformation and the emplacement of granitic bodies. Tourmalinites and veins derived from B- and Li-rich magmatic-hydrothermal fluids are believed to have been associated with the intrusion of a hidden granite dome, the tourmalinites being produced by extensive metasomatism of Ordovician metasedimentary rocks.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01162604
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  • 5
    Digitale Medien
    Digitale Medien
    Age and sources of the ore at Tharsis and Rio Tinto, Iberian Pyrite Belt, from Re-Os isotopes (1999)
    Springer
    Mineralium deposita 34 (1999), S. 790-793 
    Details
    ISSN: 1432-1866
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Re-Os isotopes were used to constrain the source of the ore-forming elements of the Tharsis and Rio Tinto mines of the Iberian Pyrite Belt, and the timing of mineralization. The pyrite from both mines has simila]r Os and Re concentrations, ranging between 0.05–0.7 and 0.6–66 ppb, respectively. 187Re/188Os ratios range from about 14 to 5161. Pyrite-rich ore samples from the massive ore of Tharsis and two samples of stockwork ore from Rio Tinto yield an isochron with an age of 346 ± 26 Ma, and an initial 187Os/188Os ratio of about 0.69. Five samples from Tharsis yield an age of 353 ± 44 Ma with an initial 187Os/188Os ratio of about 0.37. A sample of massive sulfide ore from Tharsis and one from Rio Tinto lie well above both isochrons and could represent Re mobilization after mineralization. The pyrite Re-Os ages agree with the paleontological age of 350 Ma of the black shales in which the ores are disseminated. Our data do not permit us to determine whether the Re-Os isochron yields the original age of ore deposition or the age of the Hercynian metamorphism that affected the ores. However, the reasonable Re-Os age reported here indicates that the complex history of the ores that occurred after the severe metamorphic event that affected the Iberian Pyrite Belt massive sulfide deposits did not fundamentally disturb the Re-Os geochronologic system. The highly radiogenic initial Os isotopic ratio agrees with previous Pb isotopic studies. If the initial ratio is recording the initial and not the metamorphic conditions, then the data indicate that the source of the metals was largely crustal. The continental margin sediments that underlie the deposits (phyllite-quartzite group) or the volcanic rocks (volcanogenic-sedimentary complex) in which the ores occur are plausible sources for the ore-forming metals and should constrain the models for the genesis of these deposits.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001260050239
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  • 6
    Digitale Medien
    Digitale Medien
    On the Phase Diagram of the Random Field Ising Model on the Bethe Lattice (1998)
    Springer
    Journal of statistical physics 93 (1998), S. 33-78 
    Details
    ISSN: 1572-9613
    Schlagwort(e): Random external field ; Ising model ; Gibbs states ; ground states ; Bethe lattice ; residual entropy ; dipole configurations ; Griffiths singularities
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The ferromagnetic Ising model on the Bethe lattice of degree k is considered in the presence of a dichotomous external random field ξ x = ±α and the temperature T≥0. We give a description of a part of the phase diagram of this model in the T−α plane, where we are able to construct limiting Gibbs states and ground states. By comparison with the model with a constant external field we show that for all realizations ξ = {ξ x = ±α} of the external random field: (i) the Gibbs state is unique for T 〉 T c (k ≥ 2 and any α) or for α 〉 3 (k = 2 and any T); (ii) the ±-phases coexist in the domain {T 〈 T c, α ≤ H F(T)}, where T c is the critical temperature and H F(T) is the critical external field in the ferromagnetic Ising model on the Bethe lattice with a constant external field. Then we prove that for almost all ξ: (iii) the ±-phases coexist in a larger domain {T 〈 T c, α ≤H F(T) + ε(T)}, where ε(T)〉0; and (iv) the Gibbs state is unique for 3≥α≥2 at any T. We show that the residual entropy at T = 0 is positive for 3≥α≥2, and we give a constructive description of ground states, by so-called dipole configurations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/B:JOSS.0000026727.43077.49
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  • 7
    Digitale Medien
    Digitale Medien
    RESEARCH: Managing Mountainous Degraded Landscapes After Farmland Abandonment in the Central Spanish Pyrenees (1997)
    Springer
    Environmental management 21 (1997), S. 587 -598 
    Details
    ISSN: 1432-1009
    Schlagwort(e): KEY WORDS: Abandoned fields; Plant succession; Degraded environments; Soil erosion; Runoff; Spanish Pyrenees
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Genista scorpius. Under a dense shrub cover both runoff and sediment yield are strongly controlled. As the shrub cover becomes open, sediment yield and runoff increase greatly. A dense herbaceous cover yields high runoff coefficients but moderate soil losses. From the results obtained, the possibility of abandoned field reclamation by means of selective clearing of scrub is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002679900051
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  • 8
    Digitale Medien
    Digitale Medien
    Oral metamizol (1 g and 2 g) versus ibuprofen and placebo in the treatment of lower third molar surgery pain: randomised double-blind multi-centre study (1998)
    Springer
    European journal of clinical pharmacology 53 (1998), S. 405-409 
    Details
    ISSN: 1432-1041
    Schlagwort(e): Key words Metamizol ; Dental pain
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Abstract Objective: To assess the efficacy of metamizol 1 g and 2 g in the relief of pain after surgical extraction of the lower third molar, and to compare the therapeutic effect with that of ibuprofen 600 mg or placebo. Methods: A total of 253 patients aged between 18 years and 60 years who had undergone extraction of the lower third molar (types II–IV) under local anaesthesia, up to a maximum of 108 mg of mepivacaine, were randomly assigned to a single oral dose of a new galenic form (drinkable vials) of metamizol 1 g (n = 75), metamizol 2 g (n = 72), ibuprofen 600 mg (n = 74) or placebo (n = 32). Pain intensity was evaluated by a 100-mm visual analogue scale. To enter the study, a pain level of 50 mm or more was required. The duration of the trial was 1 h. Assessments were carried out at 15, 30 and 60 min after treatment. Results: The analgesic efficacy of metamizol 2 g was significantly better than ibuprofen and placebo with regard to all evaluated parameters. The values of the pain intensity difference at 15 min, the percentage of patients with a decrease of 50% or more on the visual analogue scale at 60 min and the sum of pain intensity differences at 60 min showed metamizol 2 g to be significantly more effective than metamizol 1 g. In general, metamizol 1 g was as effective as ibuprofen 600 mg. The analgesic efficacy of placebo was significantly lower than that of all active treatments. A lower number of patients treated with metamizol 1 g (n = 1) or metamizol 2 g (n = 1) needed rescue medication than those given ibuprofen (n = 7) or placebo (n = 5). No serious adverse effects developed and none of the patients had to leave the study for this reason. Conclusions: The model of the lower third molar, for which the analgesic outcome referred to the first hour after drug administration, demonstrated that the analgesic efficacy of oral metamizol 2 g was significantly higher than that of ibuprofen 600 mg or placebo. Metamizol 1 g and ibuprofen 600 mg showed a similar therapeutic effect. All regimens were as well tolerated as placebo.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002280050400
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  • 9
    Digitale Medien
    Digitale Medien
    Acute and chronic toxicity of tributyltin (TBT) to pediveliger larvae of the bivalve Scrobicularia plana (1995)
    Springer
    Marine biology 124 (1995), S. 119-126 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A static renewal test was run for 30 d to assess the effects of the antifoulant tributyltin (TBT, nominal concentrations of 50, 125, 250 and 500 ng Sn l-1) on the survival and growth of 240 μm-long pediveliger larvae of the bivalve Scrobicularia plana (da Costa) settling in fine sand. Exposure to nominal TBT levels of ≥125 ng Sn l-1 (actual range of 37 to 102 ng Sn l-1, as analysed) resulted in substantial mortalities and negligible shell growth of individuals. More importantly, larval shell growth at the lowest concentration tested (i.e. nominal 50 ng Sn l-1 or 14 to 32 ng Sn l-1, as analysed) was significantly reduced (by a factor of ∼4) and grossly abnormal. In contrast, some control postlarvae had begun developing siphons as they attained a length of 600 to 700 μm by the end of this test, thereby completing metamorphosis and becoming juveniles. The results are discussed in relation to the widespread disappearance of S. plana in North Atlantic European estuaries during the 1980s and the concurrent TBT pollution in their waters. It is inferred that TBT is likely to have contributed to the reported demise of clam populations by preventing the successful and timely progress of their pediveliger larvae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00349153
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  • 10
    Digitale Medien
    Digitale Medien
    Platinum-group minerals in chromitites from the ojen lherzolite massif (Serrania de Ronda, Betic Cordillera, Southern Spain) (1996)
    Springer
    Mineralogy and petrology 56 (1996), S. 25-50 
    Details
    ISSN: 1438-1168
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Platingruppen-Minerale in Chromititen aus dem Ojen-Lherzolithmassiv (Serranía de Ronda, Betische Kordillere, Süd-Spanien) In den Chromititen (Cr-Erzen) aus dem Ojen-Lherzolithmassiv (Serranía de Ronda, Betische Kordillere, Süd-Spanien) warden Platingruppen-Minerale (PGM) als einzelne Einschlüsse im Chromit and in den begleitenden Silikaten gefunden. Die Mineralogie der PGM setzt sich aus Sulfiden [Laurit, Erlichmanit, Malanit, einem unbenannten (Ni-Fe-Cu)2 (Ir, Rh)S3 und einem nicht identifizierten Pd-S], Sulfarseniden (Irarsit, Hollingworthit, Ruarsit und Osarsit), Arseniden [Sperrylit, einem nicht identifizierten (Pd, Ni)-As], einer nicht identifizierten Pd-Bi-Verbindung sowie gediegenen Platingruppen-Elementen (PGE) bestchend aus Ru and Pt-Fe-Legierungen, zusammen. Texturelle Untersuchungen haben ergeben, daß die PGE-Chalkogenide mit S und As im Zuge der Chromitfällung (primäre PGM) in den hochtemperierten, magmatischen Stadien gebildet warden, während die gediegenen PGE während der niedriggradigen Serpentini sierung des ultramafischen Nebengesteins der Chromitite (sekundäre PGM) gebildet warden. Die primären PGM-Einschlüsse in den Ojen-Chromiten sind im Vergleich zu PGM-Einschlüssen in Chromititen aus dem tektonisierten oberen Mantel in Ophiolithen und anderen alpinotypen Komplexen ungewöhnlich: i) Einerseits zeigen sie eine große Vielfalt an Mineralarten aus der Gruppe der Sulfide, Sulfarsenide und Arsenide. ii) Andererseits enthalten sie spezifische Phasen aller sechs PGE. Die Einzigartigkeit der primären PGM-Mineralisation könnte hohe Aktivitäten von S and As während der Chromit-Fällung in Serranía de Ronda widerspiegeln, die mit besonderen physiko-chemischen Bedingungen während der Hebung des subkontinentalen, asthenosphärischen Mantels zusammenhängen. Die Art, die Zusammensetzung and die paragenetische Vergesellschaftung von sekundären PGM in Ojen bestätigen die relativ hohe Mobilität der PGE bei niedriger Temperatur und zeigen, daß die Remobilisierung unter geeigneten Redox-Bedingungen selektiv wirken kann, wodurch eine Trennung und Neuverteilung der PGE in den Gesteinen als Ergebnis des Alterationsprozesses bewirkt wird.
    Notizen: Summary Chromitites (Cr ores) of the Ojen lherzolite massif (Serranía de Ronda, Betic Cordillera, Southern Spain) were found to contain platinum-group minerals (PGM) as discrete inclusions in the chromite and in the associated silicates. The PGM mineralogy consists of sulfides [laurite, erlichmanite, malanite, unnamed (Ni-Fe-Cu)2 (Ir, Rh) S3, unidentified Pd-S], sulfarsenides (irarsite, hollingworthite, ruarsite, and osarsite), arsenides [sperrylite, unidentified (Pd, Ni)-As], one unidentified Pd-Bi compound, and native platinum group elements (PGE) consisting of Ru and Pt-Fe alloys. Textural considerations suggest that the PGE chalcogenides with S and As were formed in the high-temperature magmatic stages, as part of the chromite precipitation event (primary PGM), in contrast with the native PGE, which originated during the low-temperature serpentinization of the ultramafic host of the chromitites (secondary PGM). The primary PGM inclusions in the Ojen chromite are unusual compared with PGM inclusions in chromitites from tectonitic upper-mantle of ophiolites and other alpine-type complexes in that i) they display a great variety of mineral species sulfides, sulfarsenides and arsenides, and ii) comprise specific phases of all six PGE. The singularity of the primary PGM mineralization probably reflects high activities of both S and As during chromite precipitation at Serrania de Ronda to be related with particular physico-chemical conditions during uplifting of sub-continental, astenospheric mantle. The nature, composition, and paragenetic association of secondary PGM at Ojen confirm the relatively-high mobility of the PGE at low temperature, and indicate that remobilization can be selective under appropriate redox conditions causing separation and redistribution of the PGE in the rocks as a result of the alteration process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01162656
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