2,990 research outputs found
Open-Source ANSS Quake Monitoring System Software
ANSS stands for the Advanced National Seismic System of the U.S.A., and ANSS Quake Monitoring System (AQMS) is the earthquake management system (EMS) that most of its member regional seismic networks (RSNs) use. AQMS is based on Earthworm, but instead of storing files on disk, it uses a relational database with replication capability to store pick, amplitude, waveform, and event parameters. The replicated database and other features of AQMS make it a fully redundant system. A graphical user interface written in Java, Jiggle, is used to review automatically generated picks and event solutions, relocate events, and recalculate magnitudes. Add‐on mechanisms to produce various postearthquake products such as ShakeMaps and focal mechanisms are available as well. It provides a configurable automatic alarming and notification system. The Pacific Northwest Seismic Network, one of the Tier 1 ANSS RSNs, has modified AQMS to be compatible with a freely available, capable, open‐source database system, PostgreSQL, and is running this version successfully in production. The AQMS Software Working Group has moved the software from a subversion repository server hosted at the California Institute of Technology to a public repository at gitlab.com. The drawback of AQMS as a whole is that it is complex to fully configure and comprehend. Nevertheless, the fact that it is very capable, documented, and now free to use, might make it an attractive EMS choice for many seismic networks
Experimental results on mass-thickness distribution in spacecraft equipment
A technique is described for evaluating the shielding properties of spacecraft equipment with respect to cosmic radiation. A gamma-ray source is used in conjunction with a scintillation detector to determine mass-thickness distribution both in plane geometry for equipment units, and in spherical geometry for given points within the spacecraft. Equations are presented for calculating mass-thickness distribution functions, and the results are compared with experimental measurements
Evidence of micro-continent entrainment during crustal accretion
Peer reviewedPublisher PD
Testing demand responsive shared transport services via agent-based simulations
Demand Responsive Shared Transport DRST services take advantage of
Information and Communication Technologies ICT, to provide on demand transport
services booking in real time a ride on a shared vehicle. In this paper, an
agent-based model ABM is presented to test different the feasibility of
different service configurations in a real context. First results show the
impact of route choice strategy on the system performance
Counting reducible, powerful, and relatively irreducible multivariate polynomials over finite fields
We present counting methods for some special classes of multivariate
polynomials over a finite field, namely the reducible ones, the s-powerful ones
(divisible by the s-th power of a nonconstant polynomial), and the relatively
irreducible ones (irreducible but reducible over an extension field). One
approach employs generating functions, another one uses a combinatorial method.
They yield exact formulas and approximations with relative errors that
essentially decrease exponentially in the input size.Comment: to appear in SIAM Journal on Discrete Mathematic
Semi-free forearm flap for pharyngeal-esophageal reconstruction after radiation therapy
AbstractReconstruction of the pharynx and upper esophagus uses various procedures, including pedicled or free flap. Pharyngoplasty with free forearm flap provides excellent functional results. In radiation-related pharyngeal stenosis, recipient vascularization is often poor, especially in the venous system. The authors describe pharyngeal reconstruction with semi-free forearm flap, pedicled on the cephalic vein, to minimize the risk of venous thrombosis, which is the main factor of free forearm flap necrosis. Taking the case of a laryngectomy with complete pharyngeal stenosis after radiation therapy and iterative neck surgery, the technique of pharyngeal-esophageal reconstruction by semi-free forearm flap is described in a context of impaired vascularization
Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep
Organising the breeding plan of a seasonally breeding species, such as
sheep, presents a challenge to farmers and the industry as a whole,
since both economical and biological considerations need to be
carefully balanced. Understanding the breeding activity of individual
animals becomes a prerequisite for a successful breeding program. This
study set out to investigate the sources of variation and the genetic
profile of the spontaneous, out-of-season ovulatory activity of ewes
of the Chios dairy sheep breed in Greece. The definition of the trait
was based on blood progesterone levels, measured before exposing the
ewes to rams, which marks the onset of the usual breeding season. Data
were 707 records, taken over two consecutive years, of 435 ewes kept
at the Agricultural Research Station of Chalkidiki in northern
Greece. When all available pedigree was included, the total number of
animals involved was 1068. On average, 29% of all ewes exhibited
spontaneous, out-of-season ovulatory activity, with no substantial
variation between the years. Significant sources of systematic
variation were the ewe age and live weight, and the month of previous
lambing. Older, heavier ewes, that had lambed early the previous
autumn, exhibited more frequent activity. Heritability estimates were
0.216 () with a linear and 0.291 with a threshold
model. The latter better accounts for the categorical nature of the
trait. The linear model repeatability was 0.230 (). The
results obtained in this study support the notion that spontaneous
out-of-season ovulatory activity can be considered in the development
of a breeding plan for the Chios sheep breed
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