8,284 research outputs found
Digital data reformatter/deserializer
A method and apparatus is presented for reformatting and de-serializing a serially-received sequence of data words, each consisting of a fixed number of binary data bits. A block of nm bits is serially fed into a shift register or serially-connected group of shift registers. In lieu of the(nm-1)th shifts, the bits are rearranged within the shift register in parallel fashion, according to a prescribed scheme. Shifting then continues, until the first bit of each data word appears in the last bit position in the shift register, at which time that data word is shifted in parallel into an output buffer stage, from which it is outputted in parallel, after a fixed delay
The Theory of Parity Violation in Few-Nucleon Systems
We review recent progress in the theoretical description of hadronic parity
violation in few-nucleon systems. After introducing the different methods that
have been used to study parity-violating observables we discuss the available
calculations for reactions with up to five nucleons. Particular emphasis is put
on effective field theory calculations where they exist, but earlier and
complementary approaches are also presented. We hope this review will serve as
a guide for those who wish to know what calculations are available and what
further calculations need to be completed before we can claim to have a
comprehensive picture of parity violation in few nucleon systems.Comment: 69 pages, 10 figures, accepted for publication in Prog. Part. Nucl.
Phy
Delaminations in composite plates under impact loads
A method is presented for calculating the locations, shapes, and sizes of delaminations which occur in a fiber reinforced composite plate subjected to non-penetrating (low velocity) impact of a solid object. The plate may be simply supported, clamped, or free along its edges. A failure model of the delamination formation was developed. This model was then coupled with a finite element analysis. The model and the finite element analysis were then implemented by a computer code (IMPACT-ST) which can be used to estimate the damage initiation load and the locations, shapes, and sizes of the delaminations. Tests were performed measuring the geometries of the delaminations in graphite-epoxy, graphite-toughened epoxy, and graphite-PEEK plates impacted by a projectile with a spherical tip having masses ranging from 0.355 lbm to 0.963 lbm and velocities from 50 in/sec to 225 in/sec. The data were compared to the results of the model, and good agreements were found between the measured and the calculated delamination lengths and widths
Delaminations in composite plates caused by non-penetrating impact
A model is presented for estimating the dimensions of delaminations in continuous fiber reinforced composite plates subjected to non-penetrating (low velocity) impact of a solid object. The model is based on dimensional analysis, and results in two simple, closed form expressions, one providing the delamination length, the other the delamination width. Comparisons of delamination lengths and widths calculated by these expressions with experimental data suggest that the model predicts these dimensions with reasonable accuracy
Simulation of Near Horizontal Muons and Muon Bundles for the HAWC Observatory with CORSIKA
The HAWC (High Altitude Water Cerenkov) gamma ray observatory observes muons
with nearly-horizontal trajectories corresponding to zenith angles greater than
. HAWC is located at an altitude of 4100 meters a.s.l. (70 deg.
atmospheric depth of 2400 g/cm) on the extinct volcano, Sierra Negra in
Mexico. In this poster, we summarize the CORSIKA and GEANT4 as well as
toy-model based simulations performed to determine the effective area of HAWC
to muons from high zenith angle cosmic ray primaries. We are developing an
updated GEANT4 based detector response simulation that includes a model of the
volcanoes that are located near HAWC. These simulations are investigating the
capability to use muon multiplicity and rates to differentiate between the
primary particle composition (proton or iron) and measure the primary energy.Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017),
Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contribution
Detection of Near Horizontal Muons with the HAWC Observatory
The HAWC (High Altitude Water Cherenkov) gamma ray observatory is able to
observe muons with nearly horizontal trajectories. HAWC is located at an
altitude of 4100 meters a.s.l. on the Sierra Negra volcano in Mexico. The HAWC
detector is composed of 300 water tanks, each 7.3 m in diameter and 4.5 m tall,
densely packed over a physical area of 22,000 m. Previous and current
experiments have observed high zenith angle (near horizontal) muons at or near
sea level. HAWC operates as a hodoscope able to observe multi-TeV muons at
zenith angles greater than 75 degrees. This is the first experiment to measure
near horizontal muons at high altitude and with large ( 10 m) separations
for multiple muons. These muons are distinguishable from extensive air showers
by observing near horizontal particles propagating with the speed of light. The
proximity of Sierra Negra and Pico de Orizaba volcanoes provides an additional
measurement of muons with rock overburdens of several km water equivalent. We
will present the angular distribution and rate at which HAWC observes these
muon eventsComment: Presented at the 35th International Cosmic Ray Conference (ICRC2017),
Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contribution
Framework for Project Development in the Renewable Energy Sector
The concepts, descriptions, diagrams, and acronyms developed and described herein are meant to provide a contextual framework as well as a systematic, repeatable process to assist a potential project sponsor in understanding and navigating early-stage project development. Professional project developers will recognize these concepts and hold them as intuitive and even obvious, though the fundamentals of this specialized field are rarely written down and defined as they are here
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