Operation of hydrodynamic journal bearings in sodium at temperatures to 800 deg F and speeds to 12000 rpm

Operation of hydrodynamic journal bearings in liquid sodium at high temperatures and high speed

Exploding lakes in Vanuatu - "Surtseyan-style" eruptions witnessed on Ambae Island

After a long silence, Lake Vui on Ambae Island burst into spectacular life on the 28th of November 2005, disrupting the lives of 10 000 inhabitants on this sleepy tropical island in the SW Pacific. "Surtseyan- style" explosions burst through the Island's summit lake waters forming a new tuff-cone and threatening to form deadly lahars or volcanic floods. Such eruptions are rarely well observed, and these fleeting opportunities provide a chance to match volcanic processes with rock-sequences found commonly in the geologic recor

Hot subdwarf stars and their connection to thermonuclear supernovae

Hot subdwarf stars (sdO/Bs) are evolved core helium-burning stars with very thin hydrogen envelopes, which can be formed by common envelope ejection. Close sdB binaries with massive white dwarf (WD) companions are potential progenitors of thermonuclear supernovae type Ia (SN Ia). We discovered such a progenitor candidate as well as a candidate for a surviving companion star, which escapes from the Galaxy. More candidates for both types of objects have been found by crossmatching known sdB stars with proper motion and light curve catalogues. The Gaia mission will provide accurate astrometry and light curves of all the stars in our hot subdwarf sample and will allow us to compile a much larger all-sky catalogue of those stars. In this way we expect to find hundreds of progenitor binaries and ejected companions.Comment: Proceedings of the 11th Pacific Rim Conference on Stellar Astrophysics, Hong Kong 2015, Journal of Physics: Conference Series, in pres

KIC7668647: a 14 day beaming sdB+WD binary with a pulsating subdwarf

The recently discovered subdwarf B (sdB) pulsator KIC7668647 is one of the 18 pulsating sdB stars detected in the Kepler field. It features a rich g-mode frequency spectrum, with a few low-amplitude p-modes at short periods. We use new ground-based low-resolution spectroscopy, and the near-continuous 2.88 year Kepler lightcurve, to reveal that KIC7668647 consists of a subdwarf B star with an unseen white-dwarf companion with an orbital period of 14.2d. An orbit with a radial-velocity amplitude of 39km/s is consistently determined from the spectra, from the orbital Doppler beaming seen by Kepler at 163ppm, and from measuring the orbital light-travel delay of 27 by timing of the many pulsations seen in the Kepler lightcurve. The white dwarf has a minimum mass of 0.40 M_sun. We use our high signal-to-noise average spectra to study the atmospheric parameters of the sdB star, and find that nitrogen and iron have abundances close to solar values, while helium, carbon, oxygen and silicon are underabundant relative to the solar mixture. We use the full Kepler Q06--Q17 lightcurve to extract 132 significant pulsation frequencies. Period-spacing relations and multiplet splittings allow us to identify the modal degree L for the majority of the modes. Using the g-mode multiplet splittings we constrain the internal rotation period at the base of the envelope to 46-48d as a first seismic result for this star. The few p-mode splittings may point at a slightly longer rotation period further out in the envelope of the star. From mode-visibility considerations we derive that the inclination of the rotation axis of the sdB in KIC7668647 must be around ~60 degrees. Furthermore, we find strong evidence for a few multiplets indicative of degree 3 <= L <= 8, which is another novelty in sdB-star observations made possible by Kepler.Comment: arXiv admin note: text overlap with arXiv:1206.387

The population of hot subdwarf stars studied with Gaia I. The catalogue of known hot subdwarf stars

In preparation for the upcoming all-sky data releases of the Gaia mission we compiled a catalogue of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalogue contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based proper motions, classifications based on spectroscopy and colours, published atmospheric parameters, radial velocities and light curve variability information. Using several different techniques we removed outliers and misclassified objects. By matching this catalogue with astrometric and photometric data from the Gaia mission, we will develop selection criteria to construct a homogeneous, magnitude-limited all-sky catalogue of hot subdwarf stars based on Gaia data.Comment: 11 pages, A&A accepte

On the off-axis tensile test for unidirectional composites

The off axis tensile test was examined experimentally to obtain actual displacement fields over the surface of graphite polyimide coupon specimens. The experimental results were compared with approximate analytical solutions and generated finite element results. An optical method of high sensitivity moire interferometry was used to determine the actual displacements to high precision. The approximate analytical solution and the finite element results compare very favorably with the measured centerline displacements in the test section, and the finite element displacement fields provide excellent agreement with the moire displacements throughout the specimen. A 15 degree fiber orientation and coupon aspect ratios of 5 and 15 are presented

Community Emergency Management During the 2005 Ambae Eruption, Vanuatu, SW Pacific.

No abstract availabl

A fagyasztott zöldségek fogyasztási preferenciáinak vizsgálata

A magyar hűtÅ‘ipar számára a külföldi piacokon való értékesítés nagy jelentÅ‘ségű. A hűtÅ‘ipar talán az egyetlen ágazat, melynek termelése minÅ‘ségileg sosem különült el az értékesítés piacai szerint, köszönhetÅ‘en annak, hogy a vertikumban a nemzetközi követelmények érvényesültek. A komplex vásárlói modellek elemzését követÅ‘en megállapítható, hogy az ízesített termékeket leginkább az aktív szellemi foglalkozásúak részesítik elÅ‘nyben, akik átlag feletti jövedelemmel rendelkeznek. Az ízesített termékek és a vegyes összetevÅ‘jű (mix) termékek tipikus vásárlója között nem tapasztalható jelentÅ‘s eltérés. A vizsgálat eredményei alapján az a következtetés vonható le, hogy az egy összetevÅ‘jű termékek vásárlói között a legalacsonyabb a férfiak és a legmagasabb a nÅ‘k, valamint a középfokú végzettségűek aránya. --------------------------------------------- The marketing of products in foreign markets is of paramount importance for the Hungarian deep freeze industry. The deep freeze industry may be the only sector where the quality of products has never varied according to the target market, as the product chain is ruled by international requirements. The analysis of complex customer models leads us to conclude that flavoured products were favoured by mostly persons of white collar vocations, who have an above average in come. No significant discrepancies were perceived between the typical customers of flavoured products and products of mixed ingredients. Based on the results of the analysis it can be stated that among the customers choosing products consisting of one component only, the ratio of men was lowest whereas that of women and persons having secondary education was highest.mélyhűtÅ‘ipar, fagyasztott élelmiszer, export, fogyasztói magatartás, vásárlási szokások, deep freeze industry, frozen food, export, consumer behaviour, customer habits, Consumer/Household Economics, Marketing,

A large-scale, near-sea level, silicic caldera-forming eruption in Efate? An alternative model for the 1 Ma Efate Pumice Formation, Vanuatu, SW-Pacific

No abstract availabl