70,717 research outputs found
lund n
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The K2 Asteroseismic KEYSTONE sample of Dwarf and Subgiant Solar-Like Oscillators I. Data and Asteroseismic parameters
No full textMikkel N. Lund et al.Full Tables 2–4 are available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/688/A13[Aims] The KEYSTONE project aims to enhance our understanding of solar-like oscillators by delivering a catalogue of global asteroseismic parameters (Δv and vmax) for 173 stars, comprising mainly dwarfs and subgiants, observed by the K2 mission in its short-cadence mode during campaigns 6–19.[Methods] We derive atmospheric parameters and luminosities using spectroscopic data from TRES, astrometric data from Gaia, and the infrared flux method (IRFM) for a comprehensive stellar characterisation. Asteroseismic parameters are robustly extracted using three independent methods, complemented by an iterative refinement of the spectroscopic analyses using seismic log g values to enhance parameter accuracy.[Results] Our analysis identifies new detections of solar-like oscillations in 159 stars, providing an important complement to already published results from previous campaigns. The catalogue provides homogeneously derived atmospheric parameters and luminosities for the majority of the sample. Comparison between spectroscopic Teff and those obtained from the IRFM demonstrates excellent agreement. The iterative approach to spectroscopic analysis significantly enhances the accuracy of the stellar properties derived.The authors acknowledge the dedicated teams behind the Kepler and K2 missions, without whom this work would not have been possible. Short-cadence data were obtained through the Cycle 1-6 K2 Guest observer program (GO Program IDs: 1038, 2023, 3023, 4074, 5074, 6039, 7039, 8002, 10002, 11012, 12012, 13012, 14010, 15010, 16010, 17036, 18036, 19036), and associated NASA grants NNS16AE65G, NNX17AL49G, 80NSSC18K0363, and 80NSSC19K0102 to SB. Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant agreement no.: DNRF106). M.N.L. acknowledges the support of the ESA PRODEX program. D.H. acknowledges support from the Alfred P. Sloan Foundation and the Australian Research Council (FT200100871). S.H. acknowledges support from the European Research Council via the ERC consolidator grant ‘DipolarSound’ (grant agreement #101000296). T.L.C. is supported by Fun-dação para a Ciência e a Tecnologia (FCT) in the form of a work contract (CEECIND/00476/2018). A.M.S. acknowledges grants Spanish program Unidad de Excelencia Mar ía de Maeztu CEX2020-001058-M, 2021-SGR-1526 (Generalitat de Catalunya), and support from ChETEC-INFRA (EU project no. 101008324). A.S. acknowledges support from the European Research Council Consolidator Grant funding scheme (project ASTEROCHRONOMETRY, G.A. n. 772293, http://www.asterochronometry.eu). D.S. is supported by the Australian Research Council (DP190100666). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular, the institutions participating in the Gaia Multilateral Agreement. We acknowledge the use of the following Python-based software modules: Astropy (Astropy Collaboration 2013), PyAstronomy (Czesla et al. 2019), Lightkurve (Vinícius et al. 2018), Emcee (Foreman-Mackey et al. 2013), PyMC3 (Salvatier et al. 2016), KDEpy (Odland 2018), NumPyro (Phan et al. 2019; Bingham et al. 2019).With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (CEX2020-001058-M)Peer reviewe
Theoritical Foundations of Learning Environments, Edited by David H. Jonassen, Susan M. Lund, 2000
No full textDelozanne Elisabeth. Theoritical Foundations of Learning Environments, Edited by David H. Jonassen, Susan M. Lund, 2000. In: Sciences et techniques éducatives, volume 7 n°2, 2000. pp. 501-504
Informetrics on M. N. Srinivas
Get PDFM. N. Srinivas, the well known sociologist is widely recognised as architect of modern Indian sociology and social anthropology. His publications have been analysed by year, domain, authorship pattern, channels of communication used. Keywords, etc. The results indicate that the papers published by him are of a nature that qualify him to be a 'role model' for the younger generations to emulate.
By the end of 1995, Srinivas had to his credit 144 papers which, included 33 broad papers in sociology and anthropology; 18 papers in social change; 28 papers in village studies; 12 papers on religion; 17 papers on caste and 36 papers of general popular interest. The periods 1958-61 and 1974-77, when Srinivas was 38-41 and 58-61 years old. were his most productive periods with highest publication activity
Furstenberg sets in finite fields: Explaining and improving the Ellenberg-Erman proof
Get PDFA -Furstenberg set is a subset with the
property that each -dimensional subspace of can be
translated so that it intersects in at least points. Ellenberg and
Erman proved that -Furstenberg sets must have size at least
, where is a constant depending only and . In
this paper, we adopt the same proof strategy as Ellenberg and Erman, but use
more elementary techniques than their scheme-theoretic method. By modifying
certain parts of the argument, we obtain an improved bound on , and
our improved bound is nearly optimal for an algebraic generalization the main
combinatorial result. We also extend our analysis to give lower bounds for sets
that have large intersection with shifts of a specific family of higher-degree
co-dimension varieties, instead of just co-dimension subspaces
Interaction of octaethylene glycol n-dodecyl monoether with dioctadecyldimethylammonium bromide and chloride vesicles
No full textSeveral different methods were used to investigate the vesicle-to-micelle transition induced by the addition of the nonionic surfactant octaethylene glycol n-dodecyl monoether (C12E8) to spontaneously formed vesicle dispersions of dioctadecyldimethylammonium bromide and chloride (DODAX, X = Cl- and Br-). Dynamic light scattering reveals that fast mode micelles are formed upon addition of C12E6. The micellar mode becomes progressively dominant as the C12E8/DODAX molar ratio (R) is increased until the vesicle-to-micelle transition is complete. Turbidity, calorimetry, fluorescence quantum yield, and anisotropy measurements indicate two critical compositions: the first, R-sat, when the vesicle bilayer is saturated with C12E8 and the second, R-sol, which corresponds to the complete vesicle-to-micelle transition. Below R-sat the vesicles swell due to incorporation of the surfactant into the vesicle bilayer, and above R-sat mixed micelles and bilayer structures coexist, the determined R-sat and R-sol range from 0 to 1 and 4 to 6, respectively, depending on the surfactant counterion and the experimental method used. Cryo-transmission electron microscopy micrographs show that when R approximate to 4, micelles coexist with extended bilayer fragments. In pure DODAX (1.0 mM) dispersions, unilamellar vesicles are observed. According to the DSC results, C12E8 lowers the gel-to-liquid crystalline transition temperature, T-m, of DODAX and broadens the main transition peak which disappears around R approximate to 5 and 6 for DODAC and DODAB, respectively.Lund Univ, Ctr Chem & Chem Engn, S-22100 Lund, SwedenUniv Uppsala, Dept Phys Chem, S-75121 Uppsala, SwedenUNESP, IBILCE, Dept Phys, BR-15054000 Sao Jose do Rio Preto, SP, BrazilUNESP, IBILCE, Dept Phys, BR-15054000 Sao Jose do Rio Preto, SP, Brazi
Exchange of CO<sub>2</sub> in Arctic tundra: impacts of meteorological variations and biological disturbance
Get PDFAn improvement in our process-based understanding of carbon (C) exchange in the Arctic and its climate sensitivity is critically
needed for understanding the response of tundra ecosystems to a changing climate. In this context, we analysed the net ecosystem
exchange (NEE) of CO2 in West Greenland tundra (64° N) across eight snow-free periods in 8 consecutive years,
and characterized the key processes of net ecosystem exchange and its two main modulating components: gross primary production (GPP)
and ecosystem respiration (Reco). Overall, the ecosystem acted as a consistent sink of CO2, accumulating
−30 g C m−2 on average (range of −17 to −41 g C m−2) during the years 2008–2015, except 2011 (source of
41 g C m−2), which was associated with a major pest outbreak. The results do not reveal a marked meteorological effect on
the net CO2 uptake despite the high interannual variability in the timing of snowmelt and the start and duration of the growing
season. The ranges in annual GPP (−182 to −316 g C m−2) and Reco (144 to 279 g C m−2) were
> 5 fold larger than the range in NEE. Gross fluxes were also more variable (coefficients of variation are 3.6 and 4.1 %
respectively) than for NEE (0.7 %). GPP and Reco were sensitive to insolation and temperature, and there was
a tendency towards larger GPP and Reco during warmer and wetter years. The relative lack of sensitivity of NEE to
meteorology was a result of the correlated response of GPP and Reco. During the snow-free season of the anomalous year of
2011, a biological disturbance related to a larvae outbreak reduced GPP more strongly than Reco. With continued warming
temperatures and longer growing seasons, tundra systems will increase rates of C cycling. However, shifts in sink strength will
likely be triggered by factors such as biological disturbances, events that will challenge our forecasting of C states
Revised equations for estimating glomerular filtration rate based on the Lund-Malmö Study cohort.
No full textAbstract Objective. To increase the accuracy of estimated GFR (eGFR) from creatinine overall and at measured GFR ≥90 mL/min per 1.73 m(2) by revising the Lund-Malmö (LM) equations, to elaborate on more complex forms to improve the LM and CKD-EPI equations further, and to assess benefits of adding lean body mass (LBM). Material and methods. Swedish Caucasians (n = 850, 376 women; median 60, range 18-95 years) referred for GFR measurement (plasma iohexol-clearance: median 55, range 5-173 mL/min/1.73 m(2)) constituted the Lund-Malmö Study cohort. Bias, precision, accuracy, expressed as median absolute percentage difference and percentage of estimates ±10% (P(10)) and ±30% (P(30)) of measured GFR, and classification ability with respect to five GFR stages were compared with the original LM, CKD-EPI and MDRD equations. Results. LM Revised overall performed better than LM Original without LBM due to increased accuracy at measured GFR ≥90 mL/min/1.73 m(2). Further extensions of the CKD-EPI or LM equations did not substantially improve overall performance. In particular, the performance of LM Revised at measured GFR ≥90 mL/min/1.73 m(2) could not be improved further without decreasing accuracy and classification ability at lower GFR-levels. Adding LBM to the equations had no strong effect on accuracy. Conclusion. Comparisons with the CKD-EPI and MDRD equations suggest that the LM equations are superior for the present Swedish population, due to markedly higher accuracy of the LM equations at measured GFR <30 mL/min/1.73 m(2). However, the LM equations cannot be recommended for use in general clinical practice until validated in other populations
Agabiformius lentus Budde-Lund 1855
No full textAgabiformius lentus (Budde-Lund, 1855) Material examined. One female, E of Gachsaran, Gakal cave, 30 ° 18 ' 44 " N, 51 °09' 28 " E, alt. 1100 m, 18 May 2012 (CBSU-Cr-Is. 1004). Remarks. This is the first record of this species from Iran.This specimen had similar characteristics as epigean ones found in other parts of Iran (unpublished data). Distribution. Mediterranean area, synanthropicaly introduced to many other parts of the world. New record for Iran.Published as part of Kashani, Ghasem M., Malekhosseini, Mohammad-Javad & Sadeghi, Saber, 2013, First recorded cave-dwelling terrestrial isopods (Isopoda: Oniscidea) in Iran with a description of a new species, pp. 591-596 in Zootaxa 3734 (5) on page 592, DOI: 10.11646/zootaxa.3734.5.8, http://zenodo.org/record/21698
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