50 research outputs found
A Review of the Classification of the Genus Hydrastis (Ranunculaceae)
Get PDFThe genus Hydrastis has been variously classified as a monotypic taxon in the Ranunculaceae, the Berberidaceae, the Glaucidiaceae, or its own monogeneric family, the Hydrastidaceae. The objectives of this paper were 1) to review the previous classifications of Hydrastis and 2) to critique a recent paper by Tobe and Keating reevaluating the classification of the genus based on comparative morphological and anatomical studies. One conclusion of this review was that Tobe and Keating overlooked certain important papers which might have substantially altered their conclusions, viz., that Hydrastis is sufficiently distinct from the other genera of the Ranunculaceae to warrant a classification as a monogeneric family. Another conclusion was that, with the present information available, Hydrastis can be classified as a subfamily within the Ranunculaceae, but that molecular data might well alter this conclusion
The Long-Baseline Neutrino Experiment: Exploring Fundamental Symmetries of the Universe
Get PDFThe preponderance of matter over antimatter in the early Universe, the
dynamics of the supernova bursts that produced the heavy elements necessary for
life and whether protons eventually decay --- these mysteries at the forefront
of particle physics and astrophysics are key to understanding the early
evolution of our Universe, its current state and its eventual fate. The
Long-Baseline Neutrino Experiment (LBNE) represents an extensively developed
plan for a world-class experiment dedicated to addressing these questions. LBNE
is conceived around three central components: (1) a new, high-intensity
neutrino source generated from a megawatt-class proton accelerator at Fermi
National Accelerator Laboratory, (2) a near neutrino detector just downstream
of the source, and (3) a massive liquid argon time-projection chamber deployed
as a far detector deep underground at the Sanford Underground Research
Facility. This facility, located at the site of the former Homestake Mine in
Lead, South Dakota, is approximately 1,300 km from the neutrino source at
Fermilab -- a distance (baseline) that delivers optimal sensitivity to neutrino
charge-parity symmetry violation and mass ordering effects. This ambitious yet
cost-effective design incorporates scalability and flexibility and can
accommodate a variety of upgrades and contributions. With its exceptional
combination of experimental configuration, technical capabilities, and
potential for transformative discoveries, LBNE promises to be a vital facility
for the field of particle physics worldwide, providing physicists from around
the globe with opportunities to collaborate in a twenty to thirty year program
of exciting science. In this document we provide a comprehensive overview of
LBNE's scientific objectives, its place in the landscape of neutrino physics
worldwide, the technologies it will incorporate and the capabilities it will
possess.Comment: Major update of previous version. This is the reference document for
LBNE science program and current status. Chapters 1, 3, and 9 provide a
comprehensive overview of LBNE's scientific objectives, its place in the
landscape of neutrino physics worldwide, the technologies it will incorporate
and the capabilities it will possess. 288 pages, 116 figure
The ABC130 barrel module prototyping programme for the ATLAS strip tracker
Full text linkFor the Phase-II Upgrade of the ATLAS Detector, its Inner Detector,
consisting of silicon pixel, silicon strip and transition radiation
sub-detectors, will be replaced with an all new 100 % silicon tracker, composed
of a pixel tracker at inner radii and a strip tracker at outer radii. The
future ATLAS strip tracker will include 11,000 silicon sensor modules in the
central region (barrel) and 7,000 modules in the forward region (end-caps),
which are foreseen to be constructed over a period of 3.5 years. The
construction of each module consists of a series of assembly and quality
control steps, which were engineered to be identical for all production sites.
In order to develop the tooling and procedures for assembly and testing of
these modules, two series of major prototyping programs were conducted: an
early program using readout chips designed using a 250 nm fabrication process
(ABCN-25) and a subsequent program using a follow-up chip set made using 130 nm
processing (ABC130 and HCC130 chips). This second generation of readout chips
was used for an extensive prototyping program that produced around 100
barrel-type modules and contributed significantly to the development of the
final module layout. This paper gives an overview of the components used in
ABC130 barrel modules, their assembly procedure and findings resulting from
their tests.Comment: 82 pages, 66 figure
A nomenclatural correction in Caltha (Ranunculaceae)
No full textIn a comprehensive treatment of Caltha, Petra Smit (Blumea 21: 119—150. 1973) unfortunately chose an incorrect name for her fourth variety under C. palustris L. Instead of var. radicans (Forst.) Beck, this taxon should be called C. palustris var. flabellifolia (Pursh) Torrey & Gray (Fl. N. Am. I: 27. 1838). Forster’s C. radicans was described in 1807 (Trans. Linn. Soc. 8: 324) and reduced to varietal status by Beck in 1886 (Verh. Zool. Bot. Gesellsch. Wien 36: 350). According to the current International Code of Botanical Nomenclature, no name has priority outside of its rank (cf. Art. 60). Inasmuch as C. palustris var. flabellifolia was the name first established for Smit’s variety d’, as such it has priority over C. palustris var. radicans (Forst.) Beck by 30 years
STUDIES IN THE RANUNCULACEAE OF THE SOUTHEASTERN UNITED STATES. VI. MISCELLANEOUS GENERA
No full textVolume: 7Start Page: 1End Page: 1
THE CHROMOSOMES OF COLLINSONIA CANADENSIS L. (LABIATAE)
No full textVolume: 8Start Page: 216End Page: 21
STUDIES IN THE RANUNCULACEAE OF THE SOUTHEASTERN UNITED STATES. V. RANUNCULUS L
No full textVolume: 6Start Page: 266End Page: 28
