1,360,870 research outputs found
James Balmer
No full textJames Balmer received his Bachelor’s Degree in Civil Engineering from the University of Alabama in Birmingham in 1996. In 1998, Mr. Balmer was hired to support the general structural infrastructure needs at Cape Canaveral Air Force Station. He later served as a structural engineer in support of the Titan and Atlas programs for Lockheed Martin Astronautics. From 2001 to 2017, Mr. Balmer worked in support of NASA KSC projects through RS&H. At present, Mr. Balmer provides aerospace structural engineering support as needed through his sole proprietorship as well as tutoring the leaders of tomorrow.https://commons.erau.edu/space-congress-bios-2018/1018/thumbnail.jp
Extinction in NGC 628 and NGC 2403 derived from Paschen and Balmer lines
No full text. Long-slit spectrophotometry obtained simultaneously in the spectral ranges 3950--4900 A and 8000-- 10500 A is presented for a number of giant extragalactic H ii regions (GEHRs) in the spiral galaxies NGC 628 and NGC 2403. These ranges include lines from the Balmer and Paschen series of hydrogen separated by a wide wavelength interval. The Paschen and Balmer lines with special emphasis on the corresponding multiplet lines Pffi=Hffl are used to examine the dust extinction towards the GEHRs in these galaxies. We find good internal consistency for the observed/predicted line ratios used for derivation of the visual extinction, AV . Our results for AV are in general larger than previously published values based on the Hff=Hfi ratio with the GEHRs in NGC 628 exhibiting the largest extinction. Key words: galaxies: spiral -- galaxies: ISM -- dust, extinction -- H ii regions 1. Introduction Studies of both Galactic and extragalactic H ii regions rely on correction for the effect of dust on ..
Musical score, "Haste Love," for voice and piano. Words by Minnie Gilmore, music by Alfred G. Robyn. Balmer and Weber Music House Company, c. 1892
No full textPatrick Gilmore's daughter, Minnie L. Gilmore, was an author in her own right. Her published works include "Songs from the Wings," "Pipes from the Prairieland," "A Son of Esau," and "The Woman Who Stood Between." One of her verses, from "Songs from the Wings," is entitled "To my father--Patrick Sarsfield Gilmore": "Though he is dead, I still may do/ Him honor, by a life akin/ To that pure life my childhood knew,/ His fatherheart within./ And for the true musician's place,/ You claimed a throne beside the priest;/ Since both, you said, redeemed the base,/ And blessed both great and least." In this song, her verse was set to music by Alfred George Robyn (1860-1935) a composer of light opera and founder of the Marion English Opera Company in New York. Balmer and Weber Music House Company, [c.] 1892
Signs of Silence: Small RNAs and Antifungal Responses in Arabidopsis thaliana and Zea mays
Get PDFPlant small RNAs (sRNAs) are pivotal regulators of gene expression, which are crucial in
maintaining genome integrity and flexibility during development, abiotic and biotic stress
responses. Current evidence suggests that sRNAs might be inherent to the sophisticated
plant innate immune system battling bacteria. However, the role of sRNAs during antifungal
plant defences is less clear. Therefore, this chapter investigates the sRNA‐mediated
plant antifungal responses against the hemibiotrophic fungi Colletotrichum higginsianum
and Colletotrichum graminicola in their respective compatible hosts Arabidopsis thaliana
and Zea mays. A phenotypic and metabolomic analysis of A. thaliana sRNA mutants in
response to C. higginsianum infection was performed, showing a hormonal and metabolic
imbalance during fungal infection in these plants. To find whether fungal-induced
sRNA could directly regulate defence genes in an agricultural important plant model, the
expression of maize miRNAs in response to C. graminicola leaf and root infections was
investigated. The results revealed the tissue‐specific local and systemic adaptation of the
miRNA transcriptome, where only a few miRNAs were targeting defence pathways. The
general picture presented here points towards a role of sRNAs as fine‐tuners of genetic
and metabolomic defence response layers. This chapter also further discusses the potential
of utilizing sRNA‐based fungal control strategies
Structure of the Balmer jump
No full textContext. The spectrum of the hydrogen atom was explained by Bohr more than one century ago. We revisit here some of the aspects of the underlying quantum structure, with a modern formalism, focusing on the limit of the Balmer series.
Aims. We investigate the behaviour of the absorption coefficient of the isolated hydrogen atom in the neighbourhood of the Balmer limit.
Methods. We analytically computed the total cross-section arising from bound-bound and bound-free transitions in the isolated hydrogen atom at the Balmer limit, and established a simplified semi-analytical model for the surroundings of that limit. We worked within the framework of the formalism of Landi Degl’Innocenti & Landolfi (2004, Astrophys. Space Sci. Lib., 307), which permits an almost straight-forward generalization of our results to other atoms and molecules, and which is perfectly suitable for including polarization phenomena in the problem.
Results. We analytically show that there is no discontinuity at the Balmer limit, even though the concept of a “Balmer jump” is still meaningful. Furthermore, we give a possible definition of the location of the Balmer jump, and we check that this location is dependent on the broadening mechanisms. At the Balmer limit, we compute the cross-section in a fully analytical way.
Conclusions. The Balmer jump is produced by a rapid drop of the total Balmer cross-section, yet this variation is smooth and continuous when both bound-bound and bound-free processes are taken into account, and its shape and location is dependent on the broadening mechanisms
High resolution measurements and modeling of auroral hydrogen emission line profiles
Get PDFMeasurements in the visible wavelength range at
high spectral resolution (1.3 A° ) have been made at Longyearbyen,
Svalbard (15.8 E,78.2 N) during an interval of intense
proton precipitation. The shape and Doppler shift of hydrogen
Balmer beta line profiles have been compared with
model line profiles, using as input ion energy spectra from
almost coincident passes of the FAST and DMSP spacecraft.
The comparison shows that the simulation contains the important
physical processes that produce the profiles, and confirms
that measured changes in the shape and peak wavelength
of the hydrogen profiles are the result of changing
energy input. This combination of high resolution measurements
with modeling provides a method of estimating the
incoming energy and changes in flux of precipitating protons
over Svalbard, for given energy and pitch-angle distributions.
Whereas for electron precipitation, information on the incident
particles is derived from brightness and brightness ratios
which require at least two spectral windows, for proton precipitation
the Doppler profile of resulting hydrogen emission
is directly related to the energy and energy flux of the incident
energetic protons and can be used to gather information
about the source region. As well as the expected Doppler
shift to shorter wavelengths, the measured profiles have a significant
red-shifted component, the result of upward flowing
emitting hydrogen atoms
Balmer Greenhouse
No full textBalmer Greenhouse on East Third Street following a heavy snowstorm in Cle Elum, Washington.https://digitalcommons.cwu.edu/frederick_krueger/1007/thumbnail.jp
I saw from the beach, when the morning was shining, a bark o'er the waters moves gloriously on [first line]
No full textstrophicpiano and voiceRespectfully Dedicate to Miss Ada C. Branson.ads on back cover for Balmer & Weber stock3599-4Johns Hopkins University, Levy Sheet Music Collection, Box
133, Item 034Words by Thos. Moore. Music by A.G. Robyn
JADES : Balmer decrement measurements at redshifts 4 < z < 7
Get PDFWe present Balmer decrement, Hα/Hβ, measurements for a sample of 51 galaxies at redshifts za=a4 7 observed with the JWST/NIRSpec micro-shutter assembly (MSA), as part of the JWST Advanced Deep Extragalactic Survey (JADES). Leveraging 28-hour long exposures and the efficiency of the prism/clear configuration (but also using information from the medium-resolution gratings), we were able to directly probe the low-mass end of the galaxy population, reaching stellar masses, M-, as low as 107 M-. We find that the correlation between the Balmer decrement and M- is already established at these high redshifts, indicating a rapid buildup of dust in moderately massive galaxies at such early epochs. The lowest-mass galaxies in our sample (M-a=a1 3 A-107 M-) display a remarkably low Balmer decrement of 2.88 ± 0.08, consistent with Case B, suggesting very little dust content. However, we warn that such a low observed Balmer decrement may also partly be a consequence of an intrinsically lower Hα/Hβ resulting from the extreme conditions of the ionised gas in these primeval and unevolved systems. We further compare the Balmer decrement to continuum-derived star formation rates (SFRs), finding tentative evidence of a correlation, which likely traces the underlying connection between the SFR and the mass of cold gas. However, we note that larger samples are required to distinguish between direct and primary correlations from indirect and secondary dependences at such high redshifts
I saw from the beach, when the morning was shining, a bark o'er the waters moves gloriously on [first line]
No full textstrophicpiano and voiceRespectfully Dedicate to Miss Ada C. Branson.ads on back cover for Balmer & Weber stock3599-4Johns Hopkins University, Levy Sheet Music Collection, Box
133, Item 034Words by Thos. Moore. Music by A.G. Robyn
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