53 research outputs found
The Prophet Dance of the Northwest and Its Derivatives: The Source of the Ghost Dance
"The importance of the contribution to the reconstruction of native culture history of western America which this paper makes is hard to overestimate⊠It becomes a gratifying demonstration of what may be learned of historical sequences from careful analysis of data obtained in flat perspective.
Pion interferometry in Au+Au collisions at sqrt[sNN]=200GeV
We present a systematic analysis of two-pion interferometry in Au+Au collisions at sqrt[sNN]=200GeV using the STAR detector at Relativistic Heavy Ion Collider. We extract the Hanbury-Brown and Twiss radii and study their multiplicity, transverse momentum, and azimuthal angle dependence. The Gaussianness of the correlation function is studied. Estimates of the geometrical and dynamical structure of the freeze-out source are extracted by fits with blast-wave parametrizations. The expansion of the source and its relation with the initial energy density distribution is studied
GTC Follow-up Observations of Very Metal-Poor Star Candidates from DESI
The observations from the Dark Energy Spectroscopic Instrument (DESI) will
significantly increase the numbers of known extremely metal-poor stars by a
factor of ~ 10, improving the sample statistics to study the early chemical
evolution of the Milky Way and the nature of the first stars. In this paper we
report high signal-to-noise follow-up observations of 9 metal-poor stars
identified during the DESI commissioning with the Optical System for Imaging
and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) instrument on
the 10.4m Gran Telescopio Canarias (GTC). The analysis of the data using a
well-vetted methodology confirms the quality of the DESI spectra and the
performance of the pipelines developed for the data reduction and analysis of
DESI data.Comment: 13 pages, 4 figures, to be submitted to ApJ, data available from
https://doi.org/10.5281/zenodo.802084
The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar and APOGEE-2 Data
This paper documents the seventeenth data release (DR17) from the Sloan Digital Sky Surveys; the fifth and final release from the fourth phase (SDSS-IV). DR17 contains the complete release of the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, which reached its goal of surveying over 10,000 nearby galaxies. The complete release of the MaNGA Stellar Library (MaStar) accompanies this data, providing observations of almost 30,000 stars through the MaNGA instrument during bright time. DR17 also contains the complete release of the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) survey which publicly releases infra-red spectra of over 650,000 stars. The main sample from the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), as well as the sub-survey Time Domain Spectroscopic Survey (TDSS) data were fully released in DR16. New single-fiber optical spectroscopy released in DR17 is from the SPectroscipic IDentification of ERosita Survey (SPIDERS) sub-survey and the eBOSS-RM program. Along with the primary data sets, DR17 includes 25 new or updated Value Added Catalogs (VACs). This paper concludes the release of SDSS-IV survey data. SDSS continues into its fifth phase with observations already underway for the Milky Way Mapper (MWM), Local Volume Mapper (LVM) and Black Hole Mapper (BHM) surveys
GTC follow-up observations of very metal-poor star candidates from DESI
The observations from the Dark Energy Spectroscopic Instrument (DESI) will significantly increase the numbers of known extremely metal-poor stars by a factor of âŒ10, improving the sample statistics to study the early chemical evolution of the Milky Way and the nature of the first stars. In this paper we report follow-up observations with high signal-to-noise ratio of nine metal-poor stars identified during the DESI commissioning with the Optical System for Imaging and Low-Resolution Integrated Spectroscopy (OSIRIS) instrument on the 10.4 m Gran Telescopio Canarias. The analysis of the data using a well-vetted methodology confirms the quality of the DESI spectra and the performance of the pipelines developed for the data reduction and analysis of DESI data
The lodging complex in sorghum [Sorghum bicolor(L.) Moench] : morphological, chemical, and anatomical stem features associated with lodging in sorghum
Vita.Ten sorghum breeding and parental lines, equally divided between lodging resistant (LR) and lodging susceptible (LS) lines, were studied for differences in morphological, chemical, and anatomical features of the stem related to lodging resistance. Plant materials were field-grown at the Texas A&M University Research Center near Lubbock, Texas. Lodging pressure was applied by allowing: 1) soil water deficit to develop during grain-fill in the Water Deficit treatment and 2) No Water Deficit and Water Deficit treatments to remain in the field for an extended period during the winter, subjecting plants to freezing temperatures and strong winds. Water deficit during grain-fill induced lodging (basal) prior to harvest (early November) only in LS lines. Conditions during the overwintering period caused significant lodging (basal and peduncle) of two LR lines and all LS lines in both moisture regimes. Basal stem dry weight per unit length was positively correlated with lodging resistance. Stem chemical analyses showed that LS lines had greater cell wall content in rind and pith tissues which was indicative of the relative inability of these lines to maintain storage supplies of nonstructural carbohydrates in stem tissues. Composition of cell wall material indicated that LR lines had slightly higher lignin content in the rind and pith tissues than LS lines, while cellulose and hemicellulose contents were not consistently related to lodging. Structural failure of stem tissue most frequently occurred in a well defined internodal region -- the intercalary meristem zone. Anatomical differences between LR and LS lines in the intercalary meristem zone contributed more to an of lodging differences than did any of the other measured parameters. Cell wall thickness of hypodermal and vascular bundle sheath cells was generally greater in LR lines than in LS lines, especially in the intercalary meristem zone. In addition to thinner cell walls, histological staining for lignin indicated that secondary cell wall development was lacking in the intercalary meristem zone of LS lines, but appeared normal in LR lines. Rind thickness, hypodermis thickness, and vascular bundle density and size in the intercalary zone, and 10 mm above this zone, generally were not associated with lodging resistance
Apical dominance in sorghum: the effects of modification of theactivities of auxins, cytokinins and gibberellins on tillering of two sorghum cultivars
Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to [email protected], referencing the URI of the item.Bibliography: leaves 93-100.Not availabl
The lodging complex in sorghum [Sorghum bicolor(L.) Moench] : morphological, chemical, and anatomical stem features associated with lodging in sorghum
Vita.Ten sorghum breeding and parental lines, equally divided between lodging resistant (LR) and lodging susceptible (LS) lines, were studied for differences in morphological, chemical, and anatomical features of the stem related to lodging resistance. Plant materials were field-grown at the Texas A&M University Research Center near Lubbock, Texas. Lodging pressure was applied by allowing: 1) soil water deficit to develop during grain-fill in the Water Deficit treatment and 2) No Water Deficit and Water Deficit treatments to remain in the field for an extended period during the winter, subjecting plants to freezing temperatures and strong winds. Water deficit during grain-fill induced lodging (basal) prior to harvest (early November) only in LS lines. Conditions during the overwintering period caused significant lodging (basal and peduncle) of two LR lines and all LS lines in both moisture regimes. Basal stem dry weight per unit length was positively correlated with lodging resistance. Stem chemical analyses showed that LS lines had greater cell wall content in rind and pith tissues which was indicative of the relative inability of these lines to maintain storage supplies of nonstructural carbohydrates in stem tissues. Composition of cell wall material indicated that LR lines had slightly higher lignin content in the rind and pith tissues than LS lines, while cellulose and hemicellulose contents were not consistently related to lodging. Structural failure of stem tissue most frequently occurred in a well defined internodal region -- the intercalary meristem zone. Anatomical differences between LR and LS lines in the intercalary meristem zone contributed more to an of lodging differences than did any of the other measured parameters. Cell wall thickness of hypodermal and vascular bundle sheath cells was generally greater in LR lines than in LS lines, especially in the intercalary meristem zone. In addition to thinner cell walls, histological staining for lignin indicated that secondary cell wall development was lacking in the intercalary meristem zone of LS lines, but appeared normal in LR lines. Rind thickness, hypodermis thickness, and vascular bundle density and size in the intercalary zone, and 10 mm above this zone, generally were not associated with lodging resistance
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