2,301 research outputs found
An experimental model of a 2kw, 2500 volt power converter for ion thrustors using gate controlled switches in two phase-shifted parallel inverters summary report
Power converter for ion thrustors using electronic gate controlled switches in two phase-shifted parallel inverter
Wave Structures and Nonlinear Balances in a Family of 1+1 Evolutionary PDEs
We study the following family of evolutionary 1+1 PDEs that describe the
balance between convection and stretching for small viscosity in the dynamics
of 1D nonlinear waves in fluids: m_t + \underbrace{um_x \}
_{(-2mm)\hbox{convection}(-2mm)} + \underbrace{b u_xm \}
_{(-2mm)\hbox{stretching}(-2mm)} = \underbrace{\nu m_{xx}\
}_{(-2mm)\hbox{viscosity}}, \quad\hbox{with}\quad u=g*m . Here
denotes We study exchanges of
stability in the dynamics of solitons, peakons, ramps/cliffs, leftons,
stationary solutions and other solitary wave solutions associated with this
equation under changes in the nonlinear balance parameter .Comment: 69 pages, 26 figure
Alien Registration- Richard, Staley F. (Brunswick, Cumberland County)
https://digitalmaine.com/alien_docs/31657/thumbnail.jp
Identifying the VA: Space in Contemporary Pasifika Creative Writing.
M.A. Thesis. University of Hawaiʻi at Mānoa 2017
Another look at anomalous J/Psi suppression in Pb+Pb collisions at P/A = 158 GeV/c
A new data presentation is proposed to consider anomalous
suppression in Pb + Pb collisions at GeV/c. If the inclusive
differential cross section with respect to a centrality variable is available,
one can plot the yield of J/Psi events per Pb-Pb collision as a function of an
estimated squared impact parameter. Both quantities are raw experimental data
and have a clear physical meaning. As compared to the usual J/Psi over
Drell-Yan ratio, there is a huge gain in statistical accuracy. This
presentation could be applied advantageously to many processes in the field of
nucleus-nucleus collisions at various energies.Comment: 6 pages, 5 figures, submitted to The European Physical Journal C;
minor revisions for final versio
A canonical FtsZ protein in Verrucomicrobium spinosum, a member of the Bacterial phylum Verrucomicrobia that also includes tubulin-producing Prosthecobacter species
BACKGROUND: The origin and evolution of the homologous GTP-binding cytoskeletal proteins FtsZ typical of Bacteria and tubulin characteristic of eukaryotes is a major question in molecular evolutionary biology. Both FtsZ and tubulin are central to key cell biology processes – bacterial septation and cell division in the case of FtsZ and in the case of tubulins the function of microtubules necessary for mitosis and other key cytoskeleton-dependent processes in eukaryotes. The origin of tubulin in particular is of significance to models for eukaryote origins. Most members of domain Bacteria possess FtsZ, but bacteria in genus Prosthecobacter of the phylum Verrucomicrobia form a key exception, possessing tubulin homologs BtubA and BtubB. It is therefore of interest to know whether other members of phylum Verrucomicrobia possess FtsZ or tubulin as their FtsZ-tubulin gene family representative. RESULTS: Verrucomicrobium spinosum, a member of Phylum Verrucomicrobia of domain Bacteria, has been found to possess a gene for a protein homologous to the cytoskeletal protein FtsZ. The deduced amino acid sequence has sequence signatures and predicted secondary structure characteristic for FtsZ rather than tubulin, but phylogenetic trees and sequence analysis indicate that it is divergent from all other known FtsZ sequences in members of domain Bacteria. The FtsZ gene of V. spinosum is located within a dcw gene cluster exhibiting gene order conservation known to contribute to the divisome in other Bacteria and comparable to these clusters in other Bacteria, suggesting a similar functional role. CONCLUSION: Verrucomicrobium spinosum has been found to possess a gene for a protein homologous to the cytoskeletal protein FtsZ. The results suggest the functional as well as structural homology of the V. spinosum FtsZ to the FtsZs of other Bacteria implying its involvement in cell septum formation during division. Thus, both bacteria-like FtsZ and eukaryote-like tubulin cytoskeletal homologs occur in different species of the phylum Verrucomicrobia of domain Bacteria, a result with potential major implications for understanding evolution of tubulin-like cytoskeletal proteins and the origin of eukaryote tubulins
Properties and preparation of ceramic insulators for spark plugs
Report describes in detail the preliminary experiments which were made on the conductivity of spark-plug insulators in order to develop a satisfactory comparative method for testing various spark-plug materials. Materials tested were cements, porcelain, feldspar, and quartz
Real Time Global Tests of the ALICE High Level Trigger Data Transport Framework
The High Level Trigger (HLT) system of the ALICE experiment is an online
event filter and trigger system designed for input bandwidths of up to 25 GB/s
at event rates of up to 1 kHz. The system is designed as a scalable PC cluster,
implementing several hundred nodes. The transport of data in the system is
handled by an object-oriented data flow framework operating on the basis of the
publisher-subscriber principle, being designed fully pipelined with lowest
processing overhead and communication latency in the cluster. In this paper, we
report the latest measurements where this framework has been operated on five
different sites over a global north-south link extending more than 10,000 km,
processing a ``real-time'' data flow.Comment: 8 pages 4 figure
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