GLORIA

GEOMAR Library Ocean Research Information Access

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Cambridge University Press (CUP)  (10)
  • 1
    In: Proceedings of the International Astronomical Union, Cambridge University Press (CUP), Vol. 9, No. S301 ( 2013-08), p. 491-492
    Abstract: We carried out an extensive photometric and spectroscopic investigation of the SPB binary, HD 25558 (see Fig. 1 for the time and geographic distribution of the observations). The ~2000 spectra obtained at 13 observatories during 5 observing seasons, the ground-based multi-colour light curves and the photometric data from the MOST satellite revealed that this object is a double-lined spectroscopic binary with a very long orbital period of about 9 years. We determined the physical parameters of the components, and have found that both lie within the SPB instability strip. Accordingly, both components show line-profile variations consistent with stellar pulsations. Altogether, 11 independent frequencies and one harmonic frequency were identified in the data. The observational data do not allow the inference of a reliable orbital solution, thus, disentangling cannot be performed on the spectra. Since the lines of the two components are never completely separated, the analysis is very complicated. Nevertheless, pixel-by-pixel variability analysis of the cross-correlated line profiles was successful, and we were able to attribute all the frequencies to the primary or secondary component. Spectroscopic and photometric mode-identification was also performed for several of these frequencies of both binary components. The spectroscopic mode-identification results suggest that the inclination and rotation of the two components are rather different. While the primary is a slow rotator with ~6 d rotation period, seen at ~60° inclination, the secondary rotates fast with ~1.2 d rotation period, and is seen at ~20° inclination. Our spectropolarimetric measurements revealed that the secondary component has a magnetic field with at least a few hundred Gauss strength, while no magnetic field was detected in the primary. The detailed analysis and results of this study will be published elsewhere.
    Type of Medium: Online Resource
    ISSN: 1743-9213 , 1743-9221
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2013
    detail.hit.zdb_id: 2170724-8
    SSG: 16,12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    In: Proceedings of the Prehistoric Society, Cambridge University Press (CUP), Vol. 59 ( 1993), p. 197-239
    Abstract: Excavations at the Easton Down long barrow were part of a wider programme of research into the Neolithic sequence and context of the Avebury area in north Wiltshire. The short barrow, on high chalk downland to the south-west of Avebury and the upper Kennet valley, and containing only a few inhumations according to Thurnam's 19th-century investigation, dates to the later 4th millennium BC. Test pits around the barrow produced very little struck flint, and virtually no colluvium in the adjacent dry valley to the west. The mound covered a thin calcareous turfline above a rubbly soil, probably formerly cultivated. The pre-barrow molluscan fauna, soil micromorphology and other environmental data indicate a clearance adjacent to woodland. In the secondary fill of the flanking ditches there is a succession from renewed woodland to open conditions in the Late Neolithic. The Easton Down monument falls relatively late in the regional sequence of long barrow construction. Its setting was probably one of scattered, non-permanent clearances in woodland. Woodland was still widespread on the higher downland of the region in the middle of the Neolithic. Renewed and bigger-scale clearance towards the end of the Neolithic may be connected with the construction of very large monuments elsewhere in the region. The later prehistoric landscape became both more open and less diverse.
    Type of Medium: Online Resource
    ISSN: 0079-497X , 2050-2729
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1993
    detail.hit.zdb_id: 2707279-4
    SSG: 6,14
    SSG: 6,12
    SSG: 6,11
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    In: Epidemiology and Psychiatric Sciences, Cambridge University Press (CUP), Vol. 31 ( 2022)
    Abstract: Lower parental education has been linked to adverse youth mental health outcomes. However, the relationship between parental education and youth suicidal behaviours remains unclear. We explored the association between parental education and youth suicidal ideation and attempts, and examined whether sociocultural contexts moderate such associations. Methods We conducted a systematic review and meta-analysis with a systematic literature search in PubMed, PsycINFO, Medline and Embase from 1900 to December 2020 for studies with participants aged 0–18, and provided quantitative data on the association between parental education and youth suicidal ideation and attempts (death included). Only articles published in English in peer-reviewed journals were considered. Two authors independently assessed eligibility of the articles. One author extracted data [e.g. number of cases and non-cases in each parental education level, effect sizes in forms of odds ratios (ORs) or beta coefficients] . We then calculated pooled ORs using a random-effects model and used moderator analysis to investigate heterogeneity. Results We included a total of 59 articles (63 study samples, totalling 2 738 374 subjects) in the meta-analysis. Lower parental education was associated with youth suicidal attempts [OR = 1.12, 95% Confidence Interval (CI) = 1.04–1.21] but not with suicidal ideation (OR = 1.05, 95% CI = 0.98–1.12). Geographical region and country income level moderated the associations. Lower parental education was associated with an increased risk of youth suicidal attempts in Northern America (OR = 1.26, 95% CI = 1.10–1.45), but with a decreased risk in Eastern and South-Eastern Asia (OR = 0.72, 95% CI = 0.54–0.96). An association of lower parental education and increased risk of youth suicidal ideation was present in high- income countries (HICs) (OR = 1.14, 95% CI = 1.05–1.25), and absent in low- and middle-income countries (LMICs) (OR = 0.91, 95% CI = 0.77–1.08). Conclusions The association between youth suicidal behaviours and parental education seems to differ across geographical and economical contexts, suggesting that cultural, psychosocial or biological factors may play a role in explaining this association. Although there was high heterogeneity in the studies reviewed, this evidence suggests that the role of familial sociodemographic characteristics in youth suicidality may not be universal. This highlights the need to consider cultural, as well as familial factors in the clinical assessment and management of youth's suicidal behaviours in our increasingly multicultural societies, as well as in developing prevention and intervention strategies for youth suicide.
    Type of Medium: Online Resource
    ISSN: 2045-7960 , 2045-7979
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2022
    detail.hit.zdb_id: 2594528-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2006
    In:  Acta Neuropsychiatrica Vol. 18, No. 6 ( 2006-12), p. 269-270
    In: Acta Neuropsychiatrica, Cambridge University Press (CUP), Vol. 18, No. 6 ( 2006-12), p. 269-270
    Type of Medium: Online Resource
    ISSN: 0924-2708 , 1601-5215
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2006
    detail.hit.zdb_id: 2077830-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2011
    In:  Radiocarbon Vol. 53, No. 3 ( 2011), p. 419-428
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 53, No. 3 ( 2011), p. 419-428
    Abstract: The dating of South African rock art using radiocarbon is a considerable challenge and only 1 direct date has so far been obtained, on black pigments from Sonia's Cave Upper, Boontjieskloof. The main problem with direct dating these paintings is the presence of calcium oxalates behind, on, and within the pigment layers. Calcium oxalates are formed through lichen and bacterial action on the rock face. These reactions can sometimes take place over long periods and can incorporate carbon of a younger age into the pigments. This study aims to date black pigments from a rockshelter, RSA TYN2 (Eastern Cape, South Africa), by removing the calcium oxalate contamination. Two different protocols were tried: density separation and acidification. The latter successfully removed calcium oxalates and was therefore applied to 3 black pigment samples from the rockshelter. After acid pretreatment, accelerator mass spectrometry (AMS) dating was undertaken on the remaining residues. Three results were obtained (2072 ± 28 BP, 2100 ± 40 BP, and 2083 ± 32 BP), which constitute the oldest results so far obtained for direct dates on South African rock art. The most likely calibrated date range for the painting at this site is between 2120 and 1890 cal BP. The ages are in close agreement with each other and this consistency suggests that our preparation protocol has successfully removed the majority of the carbon contaminants.
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2011
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    In: American Antiquity, Cambridge University Press (CUP), Vol. 64, No. 1 ( 1999-01), p. 55-70
    Abstract: Está generalmente aceptado el postulado de que la expectativa de vida en la Antigüedad fue considerablemente más corta que la de ahora. En algunos casos, cuando era posible comprobar la edad estimada de adultos al momento de su muerte según el esqueleto y la dentadura era posible comprobarla con otros indicadores fiables de su edad, se nota una clara tendencia metodológica hacia la sobreestimación de la edad de adultos jóvenes y hacia la subestimación de edad en personas mayores. Demostramos que aquello puede ser resultado de la aplicación de técnicas de análisis que se utilizan para convertir indicadores de edad en edades estimadas. Reconociendo las limitaciones de la mayoría de los indicadores para determinar la edad en el momento de la muerte para las personas pertenecientes a las categorías de edades avanzadas, demostramos que el método Bayes utilizado para convertir indicadores de edad en la edad estimada, puede reducir tales tendencias de subestimación a edades avanzadas. Demostramos también que un método como el de Bayes siempre es mejor que cualquier método basado en la regresión, asegurando un menor promedio de diferencia entre la edad pronosticada y la edad conocida, así como el menor promedio de un confianza de 95% intervalo de amplitud de estimatión. Tomando en consideratión esas observaciones, proponemos que los métodos Bayes para recalcular los indicadores de edad en la edad estimada merezcan una investigatión adicional. Teniendo en cuenta la universalidad y la flexibilidad del método, pronosticamos también que los algoritmos similares puedan tener una aplicación mucho más amplia.
    Type of Medium: Online Resource
    ISSN: 0002-7316 , 2325-5064
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1999
    detail.hit.zdb_id: 2050689-2
    SSG: 7,26
    SSG: 6,14
    SSG: 6,33
    SSG: 6,11
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2016
    In:  Proceedings of the International Astronomical Union Vol. 12, No. S329 ( 2016-11), p. 186-190
    In: Proceedings of the International Astronomical Union, Cambridge University Press (CUP), Vol. 12, No. S329 ( 2016-11), p. 186-190
    Abstract: Eta Carinae is one of the most massive observable binaries. Yet determination of its orbital and physical parameters is hampered by obscuring winds. However the effects of the strong, colliding winds changes with phase due to the high orbital eccentricity. We wanted to improve measures of the orbital parameters and to determine the mechanisms that produce the relatively brief, phase-locked minimum as detected throughout the electromagnetic spectrum. We conducted intense monitoring of the He ii λ4686 line in η Carinae for 10 months in the year 2014, gathering ~300 high S/N spectra with ground- and space-based telescopes. We also used published spectra at the FOS4 SE polar region of the Homunculus, which views the minimum from a different direction. We used a model in which the He ii λ4686 emission is produced by two mechanisms: a) one linked to the intensity of the wind-wind collision which occurs along the whole orbit and is proportional to the inverse square of the separation between the companion stars; and b) the other produced by the ‘bore hole’ effect which occurs at phases across the periastron passage. The opacity (computed from 3D SPH simulations) as convolved with the emission reproduces the behavior of equivalent widths both for direct and reflected light. Our main results are: a) a demonstration that the He ii λ4686 light curve is exquisitely repeatable from cycle to cycle, contrary to previous claims for large changes; b) an accurate determination of the longitude of periastron, indicating that the secondary star is ‘behind’ the primary at periastron, a dispute extended over the past decade; c) a determination of the time of periastron passage, at ~4 days after the onset of the deep light curve minimum; and d) show that the minimum is simultaneous for observers at different lines of sight, indicating that it is not caused by an eclipse of the secondary star, but rather by the immersion of the wind-wind collision interior to the inner wind of the primary.
    Type of Medium: Online Resource
    ISSN: 1743-9213 , 1743-9221
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2016
    detail.hit.zdb_id: 2170724-8
    SSG: 16,12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1992
    In:  Antiquity Vol. 66, No. 252 ( 1992-09), p. 677-686
    In: Antiquity, Cambridge University Press (CUP), Vol. 66, No. 252 ( 1992-09), p. 677-686
    Abstract: Studies of prehistoric extractive and fabrication techniques suggest that the traditional view, that the earliest copper metallurgy in the British Isles was based on the exploitation of primary minerals deriving from the southwest of Ireland, is fallacious. Elaborate mineral selection and process control is not needed to produce copper of the composition reported for the Early Bronze Age, and so ore deposits in Britain were probably being exploited from a very early period.
    Type of Medium: Online Resource
    ISSN: 0003-598X , 1745-1744
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1992
    detail.hit.zdb_id: 2031736-0
    SSG: 6,14
    SSG: 6,11
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    In: Symposium - International Astronomical Union, Cambridge University Press (CUP), Vol. 213 ( 2004), p. 35-40
    Abstract: Due to their extremely small luminosity compared to the stars they orbit, planets outside our own Solar System are extraordinarily difficult to detect directly in optical light. Careful photometric monitoring of distant stars, however, can reveal the presence of exoplanets via the microlensing or eclipsing effects they induce. The international PLANET collaboration is performing such monitoring using a cadre of semi-dedicated telescopes around the world. Their results constrain the number of gas giants orbiting 1–7 AU from the most typical stars in the Galaxy. Upgrades in the program are opening regions of “exoplanet discovery space” – toward smaller masses and larger orbital radii – that are inaccessible to the Doppler velocity technique.
    Type of Medium: Online Resource
    ISSN: 0074-1809
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2004
    SSG: 16,12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1996
    In:  Antiquity Vol. 70, No. 267 ( 1996-03), p. 168-174
    In: Antiquity, Cambridge University Press (CUP), Vol. 70, No. 267 ( 1996-03), p. 168-174
    Abstract: One of the larger — and more expensive — present programmes of study in archaeological science explores the provenance of prehistoric bronzes from the Mediterranean. What are the bases of research? What will the findings tell us about the real place of metal as it moved in the ancient world?
    Type of Medium: Online Resource
    ISSN: 0003-598X , 1745-1744
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1996
    detail.hit.zdb_id: 2031736-0
    SSG: 6,14
    SSG: 6,11
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...