5,753 research outputs found
Pion spectra in Ar+Sc interactions at SPS energies
This contribution discusses recent results from analysis of Ar+Sc
interactions recorded with the NA61/SHINE detector at six beam momenta: 13A,
19A, 30A, 40A, 75A, 150A GeV/c at the CERN SPS. Rapidity and transverse mass
spectra of pions obtained with the "h-" analysis method are presented and
compared to results from p+p, Be+Be and Pb+Pb collisions.Comment: Presented at the Critical Point and Onset of Deconfinement 2016,
Wroclaw, Poland, May 30th - June 4th, 201
Identified kaon production in Ar+Sc collisions at SPS energies
NA61/SHINE is a fixed target experiment at the CERN Super Proton Synchrotron.
The main goals of the experiment are to discover the critical point of strongly
interacting matter and to study the properties of the onset of deconfinement.
In order to reach these goals, a study of hadron production properties is
performed in nucleus-nucleus, proton-proton and proton-nucleus interactions as
a function of collision energy and size of the colliding nuclei. In this talk,
the newest preliminary results on kaon spectra produced in Ar+Sc collisions at
three beam momenta (30A, 40A and 75A) will be shown. The distributions of
transverse mass and rapidity will be compared with results of NA61/SHINE (p+p,
Be+Be) and NA49 (Pb+Pb, C+C, Si+Si), as well as with available world data
Transmission research activities at NASA Lewis Research Center
A joint research program, to advance the technology of rotorcraft transmissions, consists of analytical and experimental efforts to achieve the overall goals of reducing transmission weight and noise, while increasing life and reliability. Recent activities in the areas of transmission and related component research are highlighted. Current areas include specific technologies in support of military rotary wing aviation, gearing technology, transmission noise reduction studies, a recent interest in gearbox diagnostics, and advanced transmission system studies. Results of recent activities are presented along with near term research plans
Predicted effect of dynamic load on pitting fatigue life for low-contact-ratio spur gears
How dynamic load affects the surface pitting fatigue life of external spur gears was predicted by using the NASA computer program TELSGE. Parametric studies were performed over a range of various gear parameters modeling low-contact-ratio involute spur gears. In general, gear life predictions based on dynamic loads differed significantly from those based on static loads, with the predictions being strongly influenced by the maximum dynamic load during contact. Gear mesh operating speed strongly affected predicted dynamic load and life. Meshes operating at a resonant speed or one-half the resonant speed had significantly shorter lives. Dynamic life factors for gear surface pitting fatigue were developed on the basis of the parametric studies. In general, meshes with higher contact ratios had higher dynamic life factors than meshes with lower contact ratios. A design chart was developed for hand calculations of dynamic life factors
Bernstein's Lethargy Theorem in Frechet Spaces
In this paper we consider Bernstein's Lethargy Theorem (BLT) in the context
of Fr\'{e}chet spaces. Let be an infinite-dimensional Fr\'echet space and
let be a nested sequence of subspaces of such that for any and Let be a decreasing sequence of
positive numbers tending to 0. Under an additional natural condition on
\sup\{\{dist}(x, V_n)\}, we prove that there exists and such that \frac{e_n}{3} \leq \{dist}(x,V_n) \leq 3 e_n for
any . By using the above theorem, we prove both Shapiro's
\cite{Sha} and Tyuremskikh's \cite{Tyu} theorems for Fr\'{e}chet spaces.
Considering rapidly decreasing sequences, other versions of the BLT theorem in
Fr\'{e}chet spaces will be discussed. We also give a theorem improving
Konyagin's \cite{Kon} result for Banach spaces.Comment: 20 page
Aluminum nitride insulating films for MOSFET devices
Application of aluminum nitrides as electrical insulator for electric capacitors is discussed. Electrical properties of aluminum nitrides are analyzed and specific use with field effect transistors is defined. Operational limits of field effect transistors are developed
Characterization Conditions and the Numerical Index
In this paper we survey some recent results concerning the numerical index
for large classes of Banach spaces, including vector valued
-spaces and -sums of Banach spaces where . In
particular by defining two conditions on a norm of a Banach space , namely a
Local Characterization Condition (LCC) and a Global Characterization Condition
(GCC), we are able to show that if a norm on satisfies the (LCC), then
For the case in which is
replaced by a directed, infinite set , we will prove an analogous result for
satisfying the (GCC). Our approach is motivated by the fact that \cite
{aga-ed-kham}.Comment: 17 pages. arXiv admin note: text overlap with arXiv:1106.482
Thin-film ultraviolet detector and spectrometer
Typical metal-insulator-metal detector device is formed on quartz substrate. Base electrode is 3 to 6 nm aluminum layer, overcoated with 3 to 6 nm aluminum oxide or aluminum nitride, and capped with counter electrode of gold, lead, magnesium, or aluminum. Photoelectric yield data are given for Al-AlN-Au structure
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