2,307 research outputs found
Increased Oxygen Recovery from Sabatier Systems Using Plasma Pyrolysis Technology and Metal Hydride Separation
State-of-the-art life support carbon dioxide (CO2) reduction technology is based on the Sabatier reaction where less than 50% of the oxygen required for the crew is recovered from metabolic CO2. The reaction produces water as the primary product and methane as a byproduct. Oxygen recovery is constrained by the limited availability of reactant hydrogen. This is further exacerbated when Sabatier methane (CH4) is vented as a waste product resulting in a continuous loss of reactant hydrogen. Post-processing methane with the Plasma Pyrolysis Assembly (PPA) to recover hydrogen has the potential to dramatically increase oxygen recovery and thus drastically reduce the logistical challenges associated with oxygen resupply. The PPA decomposes methane into predominantly hydrogen and acetylene. Due to the highly unstable nature of acetylene, a separation system is necessary to purify hydrogen before it is recycled back to the Sabatier reactor. Testing and evaluation of a full-scale Third Generation PPA is reported and investigations into metal hydride hydrogen separation technology is discussed
The Vehicle, 1969, Vol. 11 no. 2
Vol. 11, No. 2
Table of Contents
Short Story: The TripCharles Whitepage 4
PhotoDale Huberpage 5
A NightRoger Zulaufpage 6
Sixteen-year-old Students...NBpage 6
LostJim Biropage 6
The AmateurRoger Zulaufpage 7
ManRoger Zulaufpage 7
My CamelotRonald Garnerpage 7
The Rose and the BriarKenneth L. Folkertspage 9
Who Am I?Frank McKennedypage 10
PhotoDale Huberpage 11
Mr. Samuel ClemensLarry A. Millerpage 11
Lock OutAra Childspage 12
Excuse MeRoger Zulaufpage 12
On Shadows from a Candle \u2767Michael G. McKeepage 12
beginning of an endCaryl Dagropage 12
DrawingMADpage 13
We Ain\u27t Un HurJames Birchlerpage 13
Genesis II, 18 \u2767Michael G. McKeepage 13
Short Story: A Patent Leather PaleEleanor Aikenpage 14
hungry childRoger Zulaufpage 15
DrawingRoger Zulaufpage 15
PhotoRoger Digglepage 16
Do You Like The Rain?Linda Boltmanpage 17
Seasons ChangePerry J. Carterpage 17
PhotoDale Huberpage 19
Whistling TreesPam McKinneypage 19
PostscriptThomas W. Reapage 20
PhotoDale Huberpage 20https://thekeep.eiu.edu/vehicle/1020/thumbnail.jp
The Vehicle, 1969, Vol. 11 no. 2
Vol. 11, No. 2
Table of Contents
Short Story: The TripCharles Whitepage 4
PhotoDale Huberpage 5
A NightRoger Zulaufpage 6
Sixteen-year-old Students...NBpage 6
LostJim Biropage 6
The AmateurRoger Zulaufpage 7
ManRoger Zulaufpage 7
My CamelotRonald Garnerpage 7
The Rose and the BriarKenneth L. Folkertspage 9
Who Am I?Frank McKennedypage 10
PhotoDale Huberpage 11
Mr. Samuel ClemensLarry A. Millerpage 11
Lock OutAra Childspage 12
Excuse MeRoger Zulaufpage 12
On Shadows from a Candle \u2767Michael G. McKeepage 12
beginning of an endCaryl Dagropage 12
DrawingMADpage 13
We Ain\u27t Un HurJames Birchlerpage 13
Genesis II, 18 \u2767Michael G. McKeepage 13
Short Story: A Patent Leather PaleEleanor Aikenpage 14
hungry childRoger Zulaufpage 15
DrawingRoger Zulaufpage 15
PhotoRoger Digglepage 16
Do You Like The Rain?Linda Boltmanpage 17
Seasons ChangePerry J. Carterpage 17
PhotoDale Huberpage 19
Whistling TreesPam McKinneypage 19
PostscriptThomas W. Reapage 20
PhotoDale Huberpage 20https://thekeep.eiu.edu/vehicle/1020/thumbnail.jp
LSST Science Book, Version 2.0
A survey that can cover the sky in optical bands over wide fields to faint
magnitudes with a fast cadence will enable many of the exciting science
opportunities of the next decade. The Large Synoptic Survey Telescope (LSST)
will have an effective aperture of 6.7 meters and an imaging camera with field
of view of 9.6 deg^2, and will be devoted to a ten-year imaging survey over
20,000 deg^2 south of +15 deg. Each pointing will be imaged 2000 times with
fifteen second exposures in six broad bands from 0.35 to 1.1 microns, to a
total point-source depth of r~27.5. The LSST Science Book describes the basic
parameters of the LSST hardware, software, and observing plans. The book
discusses educational and outreach opportunities, then goes on to describe a
broad range of science that LSST will revolutionize: mapping the inner and
outer Solar System, stellar populations in the Milky Way and nearby galaxies,
the structure of the Milky Way disk and halo and other objects in the Local
Volume, transient and variable objects both at low and high redshift, and the
properties of normal and active galaxies at low and high redshift. It then
turns to far-field cosmological topics, exploring properties of supernovae to
z~1, strong and weak lensing, the large-scale distribution of galaxies and
baryon oscillations, and how these different probes may be combined to
constrain cosmological models and the physics of dark energy.Comment: 596 pages. Also available at full resolution at
http://www.lsst.org/lsst/sciboo
Parent-of-origin-specific allelic associations among 106 genomic loci for age at menarche.
Age at menarche is a marker of timing of puberty in females. It varies widely between individuals, is a heritable trait and is associated with risks for obesity, type 2 diabetes, cardiovascular disease, breast cancer and all-cause mortality. Studies of rare human disorders of puberty and animal models point to a complex hypothalamic-pituitary-hormonal regulation, but the mechanisms that determine pubertal timing and underlie its links to disease risk remain unclear. Here, using genome-wide and custom-genotyping arrays in up to 182,416 women of European descent from 57 studies, we found robust evidence (Pâ<â5âĂâ10(-8)) for 123 signals at 106 genomic loci associated with age at menarche. Many loci were associated with other pubertal traits in both sexes, and there was substantial overlap with genes implicated in body mass index and various diseases, including rare disorders of puberty. Menarche signals were enriched in imprinted regions, with three loci (DLK1-WDR25, MKRN3-MAGEL2 and KCNK9) demonstrating parent-of-origin-specific associations concordant with known parental expression patterns. Pathway analyses implicated nuclear hormone receptors, particularly retinoic acid and Îł-aminobutyric acid-B2 receptor signalling, among novel mechanisms that regulate pubertal timing in humans. Our findings suggest a genetic architecture involving at least hundreds of common variants in the coordinated timing of the pubertal transition
LSST: from Science Drivers to Reference Design and Anticipated Data Products
(Abridged) We describe here the most ambitious survey currently planned in
the optical, the Large Synoptic Survey Telescope (LSST). A vast array of
science will be enabled by a single wide-deep-fast sky survey, and LSST will
have unique survey capability in the faint time domain. The LSST design is
driven by four main science themes: probing dark energy and dark matter, taking
an inventory of the Solar System, exploring the transient optical sky, and
mapping the Milky Way. LSST will be a wide-field ground-based system sited at
Cerro Pach\'{o}n in northern Chile. The telescope will have an 8.4 m (6.5 m
effective) primary mirror, a 9.6 deg field of view, and a 3.2 Gigapixel
camera. The standard observing sequence will consist of pairs of 15-second
exposures in a given field, with two such visits in each pointing in a given
night. With these repeats, the LSST system is capable of imaging about 10,000
square degrees of sky in a single filter in three nights. The typical 5
point-source depth in a single visit in will be (AB). The
project is in the construction phase and will begin regular survey operations
by 2022. The survey area will be contained within 30,000 deg with
, and will be imaged multiple times in six bands, ,
covering the wavelength range 320--1050 nm. About 90\% of the observing time
will be devoted to a deep-wide-fast survey mode which will uniformly observe a
18,000 deg region about 800 times (summed over all six bands) during the
anticipated 10 years of operations, and yield a coadded map to . The
remaining 10\% of the observing time will be allocated to projects such as a
Very Deep and Fast time domain survey. The goal is to make LSST data products,
including a relational database of about 32 trillion observations of 40 billion
objects, available to the public and scientists around the world.Comment: 57 pages, 32 color figures, version with high-resolution figures
available from https://www.lsst.org/overvie
A first generation BAC-based physical map of the rainbow trout genome
Background: Rainbow trout (Oncorhynchus mykiss) are the most-widely cultivated cold freshwater fish in the world and an important model species for many research areas. Coupling great interest in this species as a research model with the need for genetic improvement of aquaculture production efficiency traits justifies the continued development of genomics research resources. Many quantitative trait loci (QTL) have been identified for production and life-history traits in rainbow trout. A bacterial artificial chromosome (BAC) physical map is needed to facilitate fine mapping of QTL and the selection of positional candidate genes for incorporation in marker-assisted selection (MAS) for improving rainbow trout aquaculture production. This resource will also facilitate efforts to obtain and assemble a whole-genome reference sequence for this species.[br/] Results: The physical map was constructed from DNA fingerprinting of 192,096 BAC clones using the 4-color high-information content fingerprinting (HICF) method. The clones were assembled into physical map contigs using the finger-printing contig (FPC) program. The map is composed of 4,173 contigs and 9,379 singletons. The total number of unique fingerprinting fragments (consensus bands) in contigs is 1,185,157, which corresponds to an estimated physical length of 2.0 Gb. The map assembly was validated by 1) comparison with probe hybridization results and agarose gel fingerprinting contigs; and 2) anchoring large contigs to the microsatellite-based genetic linkage map.[br/] Conclusion: The production and validation of the first BAC physical map of the rainbow trout genome is described in this paper. We are currently integrating this map with the NCCCWA genetic map using more than 200 microsatellites isolated from BAC end sequences and by identifying BACs that harbor more than 300 previously mapped markers. The availability of an integrated physical and genetic map will enable detailed comparative genome analyses, fine mapping of QTL, positional cloning, selection of positional candidate genes for economically important traits and the incorporation of MAS into rainbow trout breeding programs
Recommended from our members
The lowâdegree shape of Mercury
The shape of Mercury, particularly when combined with its geoid, provides clues to the planet's internal structure, thermal evolution, and rotational history. Elevation measurements of the northern hemisphere acquired by the Mercury Laser Altimeter on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging spacecraft, combined with 378 occultations of radio signals from the spacecraft in the planet's southern hemisphere, reveal the lowâdegree shape of Mercury. Mercury's mean radius is 2439.36â±â0.02âkm, and there is a 0.14âkm offset between the planet's centers of mass and figure. Mercury is oblate, with a polar radius 1.65âkm less than the mean equatorial radius. The difference between the semimajor and semiminor equatorial axes is 1.25âkm, with the long axis oriented 15° west of Mercury's dynamically defined principal axis. Mercury's geoid is also oblate and elongated, but it deviates from a sphere by a factor of 10 less than Mercury's shape, implying compensation of elevation variations on a global scale
- âŠ