3,362 research outputs found
The spectrum of the B[e] star BAL224
We present optical spectroscopy of the emission line star BAL 224 (V=17.3,
B-V=0.46). This star also named KWBBE 485, [MA93]906 is located at the
periphery of the young SMC cluster NGC 330; it is known as a photometric
variable with a possible period around 1 day (Balona 1992). Furthermore it was
reported as the optical counterpart of the prominent mid-infrared source (MIR1)
by Kucinskas et al. (2000), indicating the presence of a dust shell. The star
was included in a sample of B-type stars observed using the ESO VLT-FLAMES
facilities. The presence of emission lines such as Fe II,[Fe II], [S II] make
this object like a B[e] star. The H, H and H lines show
an asymmetrical double-peaked emission profile suggesting the presence of an
accretion disk. Moreover the MACHO and OGLE light curves were analyzed; in
addition to a long-term variability ( 2300d), a short period very close
to 1 day has been detected using different methods, confirming the variability
previously reported by Balona (1992). Finally the nature of this object is
reconsidered.Comment: 4 page
Year Book of the Selden Society, Volume 2, Part 1 (January 1938)
Articles
Certain Limitations Upon the Rule That Publications Shall Not Be Subject to Prior Restraints, John C. Payne page 7
Due Process in Relation to the Bill of Rights, Howard Lamar Burns and William Hummel Harley, page 19
The Power of the State to Regulate and Fix Prices, G. Werber Bryan and R. H. Gayle, page 29
The Immunity of Federal Instrumentalities, Sam Rogol and Randolph Murdaugh, Jr., page 37
The Power of the President to Remove Federal Officers, Paul Taylor, page 44
The Right of Almost-Free Speech, Pinckiney H. Walker, page 49
A Discussion of General Motors Acceptance Corporation vs. Hanahan, William Hummel Harley, page 53 Biographical Sketches
Benjamin Deland Hodges, Theodore E. Ninestein, page 1
Joseph Daniel Pope, Randolph Murdaugh, Jr., page 56
Maurice Herndon Moore, Wesley M. Walker, page 58
Dean Thomas, Edward Harter, page 6
Invoice from E. & H. Hummel & Co. to Robert Goelet
https://digitalcommons.salve.edu/goelet-personal-expenses/1285/thumbnail.jp
CAMP LIFE AND SPORT IN SOUTH AFRICA. Experiences of Kaffitr warfare with the Cape Mounted Rifles
Onlangs het die Africana Book Society, posbus 1071, Johannesburg, begin met die uitgee van faksimileherdrukke van 'n aantal bekende werke oar verskillende aspekte van ons verlede. As nr 2 in hierdie reeks het vaandrig (later kapt) Thomas John Lucas se bogenoemde werk, nou voorsien van 'n kort, verklarende inleiding deur H. C. Hummel, verskyn.KeywordsT. J. LUCAS; sir George Clerk; Imperial Cape Mounted Rifles; Cape Mounted Rifles; Fort Brow
Leidt gamen wel tot leren?
Hummel, H. G. K., & Meijrink, L. (2008). Leidt gamen wel tot leren? [Does gaming lead to learning?] 12-18: Het VAKblad voor het voortgezet onderwijs, 9, 18-19.Omdat games aansluiten op de belevingswereld van
jongeren,
is te verwachten dat ze positief werken op de
motivatie om te leren. Maar de ontwikkeling van games
voor het onderwijs is vaak duur en ingewikkeld. Bovendien
is er is nog niet veel onderzoek gedaan naar de
daadwerkelijke leereffecten van onderwijsgames
Second Year Results of the 4-H Swine Project
In 2001, a pilot project was conducted that sold pigs from the Lauren Christian Swine Research and Demonstration Farm to area 4-H youth. Youth from six counties bought pigs that were farrowed at the farm in January and February. The objectives of making pigs available were: To help increase county fair swine numbers in selected counties. To increase the number of young people with swine projects in southwest Iowa. To help youth by providing a reliable, healthy, and high performing source of fairly priced pigs. To enhance education and project knowledge
The Westerschelde estuary: two food webs and a nutrient rich desert
Hummel et al. (1988) hypothesised the concomitant existence of two separate food chains in the Westerschelde: a photo-autotrophic coastal food chain in the marine part and a heterotrophic chain in the brackish part. The present study intends to re-examine the hypothesis on the basis of recently published data. Biomass gradients of the important functional units along an estuarine transect were observed to differ from those reported by Hummel et al. (1988) in some important aspects. The biomodal primary production gradient reported by Spaendonck et al. (in press) does not resemble the phytoplankton biomass curve, gradually increasing from the sea to Antwerp proposed by Hummel et al. (1988). Estimates of mesozooplankton biomass were found to be about an order of magnitude lower than reported by Hummel et al. (1988) and to display a completely different and more complex spatial pattern. However, the new gradient found is more in line with the hypothesis of two food chains than the gradient reported by Hummel et al. (1988). In the macrobenthos the biomass peak in the brackish part reported by Hummel et al. (1988) could not be confirmed. This finding does not falsify the original hypothesis as the function of this detritus dependent macrobenthic fauna is largely taken over by the hyperbenthic mysids, a group of previously unknown importance in the system. The existence of two food chains is also supported by the gradients observed in fish and epibenthic invertebrates, functional units not addressed by Hummel et al. (1988). In the zone between the two different food chains the dominant animal groups of the pelagic system have only a low biomass, this is the nutrient rich desert of the title. The zone upstream of the Dutch-Belgian border supports no hyperbenthos, no epibenthos and no mesozooplankton because of the low dissolved oxygen concentrations (less than 40% saturation), but there is a prominent peak in the microzooplankton. Clearly, in the brackish part, the richness of most functional units can only be explained on the basis of an input of organic matter from outside, consumed through a heterotrophic food chain. A second, smaller peak is observed close to the mouth of the estuary and is dependent on the primary production in the marine part of the estuary. Even for individual species this clear bimodal pattern can be observed. This disqualifies simplistic physiological models of estuarine succession as a basis for the findings. In the oxygenated part of the system there is no good general correlation between macrobenthic biomass (mostly suspension-feeders) and primary production. Macrobenthic biomass is highly variable in this zone, probably as a result of local differences in current velocity maxima. The new data confirm the view of Hummel et al. (1988) but it is concluded that these authors must have formulated their hypothesis intuitively and could not have done so from the data available at the time
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