1,073 research outputs found
A Simple Multiprocessor Management System for Event-Parallel Computing
Offline software using TCP/IP sockets to distribute particle physics events
to multiple UNIX/RISC workstations is described. A modular, building block
approach was taken, which allowed tailoring to solve specific tasks efficiently
and simply as they arose. The modest, initial cost was having to learn about
sockets for interprocess communication. This multiprocessor management software
has been used to control the reconstruction of eight billion raw data events
from Fermilab Experiment E791.Comment: 10 pages, 3 figures, compressed Postscript, LaTeX. Submitted to NI
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An Investigation of Internet Auction Markets: Evidence from eBay
The purpose of this paper was to examine a market with different characteristics than a typical financial market using high frequency continuous transactions data. The market selected for this purpose was an Internet auction market for collectibles, specifically Ty Glory Bearsâą sold on the eBay, Inc. web site. This market was chosen for its relatively high activity and homogeneity. The results indicated evidence of signaling related to seller\u27s reputation and product information, seasonality based on day-of-the-week, and limited market depth
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Computational Fluid Dynamics Models of Electromagnetic Levitation Experiments in Reduced Gravity
Electromagnetic levitation experiments provide a powerful tool that allows for the study of nucleation, solidification and growth in a containerless processing environment. Containerless processing allows for the study of reactive melts at elevated temperatures without chemical interactions or contamination from a container. Further, by removing the interface between the liquid and its container, this processing technique allows for greater access to the undercooled region for solidification studies. However, in these experiments it is important to understand the magnetohydrodynamic flow within the sample and the effects that this fluid flow has on the experiment.
A recent solidification study found that aluminum-nickel alloy sample have an unusual response of the growth rate of the solid to changes in undercooling. This alloy experienced a decrease in the growth velocity as the initial undercooling deepened, instead of the expected increase in solidification velocity with deepening undercoolings. Current work is exploring several different theories to explain this phenomenon. Distinguishing among these theories requires a comprehensive understanding of the behavior of the internal fluid flow. Our project, USTIP, has done flow modeling to support this and multiple other collaborators on ISS-EML. The fluid flow models presented for the aluminum-nickel sample provide critical insights into the nature of the flow within the aluminum-nickel alloy experiments conducted in the ISS-EML facility. These models have found that for this sample the RNG k-Δ model should be used with this sample at temperatures greater than 1800 K and the laminar flow model should be used at temperatures lower than 1600 K.
Other work in the ISS-EML, has studied the thermophysical properties of liquid germanium and has found the most recent measurements using oscillating drop techniques to have a discrepancy from the expected property measurements taken terrestrially. Investigating this discrepancy required the quantification of the velocity and characterization of the internal fluid flow in the drop. The models have found that the flow within the sample maintains turbulent behavior throughout cooling.
This thesis presents the analysis of the internal flow of four additional samples processed in the International Space Station Electromagnetic Levitation facility. These samples consist of the following alloys: Ti39.5Zr39.5Ni21, Cu50Zr50, Vitreloy 106, and Zr64Ni36. Our collaborators work required the internal flow to be characterized and quantified for their work on solidification. In addition to quantifying the velocity of the flow, the Reynolds number was calculated to characterize the flow during processing. Additionally, the shear-strain rate was calculated for the flow during processing up to the recalescence of the melt
Jouhikko: An Instrumental Evolution
Jouhikko: An Instrumental Evolution
Author: Rachel Bracker
Mentor: Dr. Timothy Smit, Department of History
The Jouhikko is a unique instrument from Finland that has been in use since around the twelfth century. The Jouhikko is a member of the bowed lyre instrumental family, and its origin is surrounded in mystery and uncertainty. However, references to the Jouhikko, and instruments which could be potentially related to it, can be found in the Finnish epic the Kalevala and in archaeological sites throughout the Scandinavian region. The first portion of this project investigates the evolution of the Jouhikko over time. This is done by examining the history of instruments with similar designs and/or construction, such as the Gusli and the Erhu, as well as looking into the evolution of the bow. The playing styles of instruments from the neighboring regions, such as of Novgorod Russia and the Asian Steppes, are also examined. The second portion of this thesis documents how I constructed my own replica of a Jouhikko and compares my construction method with the method used by a professional luthier. The final portion of this thesis will analyze different methods used to play the Jouhikko, and compares these methods to the playing styles of the Erhu, Gusli, and the Kantele
Polymonad programming in Haskell
Polymonads were recently introduced by Hicks et al. as a unified approach to programming with different notions of monads. Their work was mainly focussed on foundational aspects of the approach. In this article, we show how to incorporate the notion of polymonads into Haskell, which is the first time this has been done in a full-scale language. In particular, we show how polymonads can be represented in Haskell, give a justification of the representation through proofs in Agda, and provide a plugin for the Glasgow Haskell Compiler (GHC) that enables their use in practice. Finally, we demonstrate the utility of our system by means of examples concerned with session types and the parameterized effect monad. This work provides a common representation of a number of existing approaches to generalized monads in Haskell
Resolution of Nearly Mass Degenerate Higgs Bosons and Production of Black Hole Systems of Known Mass at a Muon Collider
The direct s-channel coupling to Higgs bosons is 40000 times greater for
muons than electrons; the coupling goes as mass squared. High precision
scanning of the lighter and the higher mass and is thus
possible with a muon collider. The and are expected to be nearly
mass degenerate and to be CP even and odd, respectively. A muon collider could
resolve the mass degeneracy and make CP measurements. The origin of CP
violation in the and meson systems might lie in the the
Higgs bosons. If large extra dimensions exist, black holes with
lifetimes of seconds could be created and observed via Hawking
radiation at the LHC. Unlike proton or electron colliders, muon colliders can
produce black hole systems of known mass. This opens the possibilities of
measuring quantum remnants, gravitons as missing energy, and scanning
production turn on. Proton colliders are hampered by parton distributions and
CLIC by beamstrahlung. The ILC lacks the energy reach.Comment: Latex, 5 pages, 2 figures, proceedings to the DPF 2004: Annual
Meeting of the Division of Particles and Fields of APS, 26 August-31 August
2004, Riverside, CA, US
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An Investigation of Internet Auction Markets: Evidence from eBay
The purpose of this paper was to examine a market with different characteristics than a typical âfinancialâ market using high frequency continuous transactions data. The market selected for this purpose was an Internet auction market for collectibles, specifically Ty Glory BearsTM sold on the eBay, Inc. web site. This market was chosen for its relatively high activity and homogeneity. The results indicated evidence of signaling related to sellerâs reputation and product information, seasonality based on day-of-the-week, and limited market dept h
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