68,958 research outputs found
The STAR Tracking Upgrade
The STAR experiment at the Relativistic Heavy Ion Collider RHIC studies the
new state of matter produced in relativistic heavy ion collisions and the spin
structure of the nucleon in collisions of polarized protons. In order to
improve the capabilities for heavy flavor measurements and the reconstruction
of charged vector bosons an upgrade of the tracking system both in the central
and the forward region is pursued. The challenging environments of high track
multiplicity in heavy ion collisions and of high luminosity in polarized proton
collisions require the use of new technologies. The proposed inner tracking
system, optimized for heavy flavor identification, is using active pixel
sensors close to the collision point and silicon strip technology further
outward. Charge sign determination for electrons and positrons from the decay
of W bosons will be provide by 6 large-area triple GEM disks currently under
development. A prototype of the active pixel detectors has been tested in the
STAR experiment, and an extensive beam test of triple GEM detectors using GEM
foils produced by Tech-Etch of Plymouth, MA has been done at Fermilab.Comment: 3 pages, 1 figure, contributed paper to EPS HEP2007, Manchester, U
Comparative performance of twenty-three types of flat plate solar energy collectors
Report compares efficiencies of 23 solar collectors for four different purposes: operating a Rankine-cycle engine, heating or absorption air conditioning, heating hot water, and heating a swimming pool
Status of the NASA-Lewis flat-plate collector tests with a solar simulator
Simulator test results of 15 collector types are presented. Collectors are given performance ratings according to their use for pool heating, hot water, absorption A/C or heating, and solar Rankine machines. Collectors found to be good performers in the above categories, except for pool heating, were a black nickel coated, 2 glass collector, and a black paint 2 glass collector containing a mylar honeycomb. For pool heating, a black paint, one glass collector was found to be the best performer. Collector performance parameters of 5 collector types were determined to aid in explaining the factors that govern performance. The two factors that had the greatest effect on collector performance were the collector heat loss and the coating absorptivity
An experimental investigation with artificial sunlight of a solar hot-water heater
Thermal performance measurements were made of a commercial solar hot water heater in a solar simulator to determine basic performance characteristics of a traditional type of flat plate collector, with and without side reflectors (to increase the solar flux). Information on each of the following was obtained; (1) the effect of flow and incidence angle on the efficiency of a flat plate collector (but only without side reflectors); (2) transient performance under flow and nonflow conditions; (3) the effectiveness of reflectors to increase collector efficiency for a zero radiation angle at fluid temperatures required for solar air conditioning; and (4) the limits of applicability of a collector efficiency correlation based on the Hottel Whillier equation
Electron spin dynamics and electron spin resonance in graphene
A theory of spin relaxation in graphene including intrinsic, Bychkov-Rashba,
and ripple spin-orbit coupling is presented. We find from spin relaxation data
by Tombros et al. [Nature 448, 571 (2007).] that intrinsic spin-orbit coupling
dominates over other contributions with a coupling constant of 3.7 meV.
Although it is 1-3 orders of magnitude larger than those obtained from first
principles, we show that comparable values are found for other honeycomb
systems, MgB2 and LiC6; the latter is studied herein by electron spin resonance
(ESR). We predict that spin coherence is longer preserved for spins
perpendicular to the graphene plane, which is beneficial for spintronics. We
identify experimental conditions when bulk ESR is realizable on graphene
Standardized solar simulator tests of flat plate solar collectors. 1: Soltex collector with two transparent covers
A Soltex flat plate solar collector was tested with a solar simulator for inlet temperatures of 77 to 201 F, flux levels of 240 and 350 Btu/hr-sq ft, a collant flow rate of 10.5 lb/hr sq ft, and incident angles of 0 deg, 41.5 deg, and 65.2 deg. Collector performance is correlated in terms of inlet temperature, flux level, and incident angle
Expertise effects in memory recall: A reply to Vicente and Wang
This article may not exactly replicate the final version published in the APA journal. It is not the copy of record.In the January 1998 Psychological Review, Vicente and Wang propose a "constraint attunement hypothesis" to explain the large effects of domain expertise upon memory recall observed in a number of task domains. They claim to find serious defects in alternative explanations of these effects which their theory overcomes. Re-examination of the evidence shows that their theory is not novel, but has been anticipated by those they criticize, and that other current published theories of the phenomena do not have the defects Vicente and Wang attribute to them. Vicente and Wang's views reflect underlying differences (a) about emphasis upon performance versus process in psychology, and (b) about how theories and empirical knowledge interact and progress with the development of a science
On Local Borg-Marchenko Uniqueness Results
We provide a new short proof of the following fact, first proved by one of us
in 1998: If two Weyl-Titchmarsh m-functions, , of two Schr\"odinger
operators H_j = -\f{d^2}{dx^2} + q_j, j=1,2 in , , are exponentially close, that is, |m_1(z)- m_2(z)|
\underset{|z|\to\infty}{=} O(e^{-2\Ima (z^{1/2})a}), 0<a<R, then
a.e.~on . The result applies to any boundary conditions at x=0 and x=R
and should be considered a local version of the celebrated Borg-Marchenko
uniqueness result (which is quickly recovered as a corollary to our proof).
Moreover, we extend the local uniqueness result to matrix-valued Schr\"odinger
operators.Comment: LaTeX, 18 page
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Pattern recognition makes search possible: Comments on Holding (1992)
Chase and Simon’s (1973) chunking theory of expert memory, which emphasizes the role of pattern recognition in problem solving, has attracted much attention in cognitive psychology. Holding (1992) advanced a series of criticisms that, taken together, purported to refute the theory. Two valid criticisms—that chunk size and LTM encoding were underestimated—are dealt with by a simple extension of the theory (Gobet & Simon, 1996a). The remainder of Holding’s criticisms either are not empirically founded or are based on a misunderstanding of the chunking theory and its role in a comprehensive theory of skill. Holding’s alternative SEEK theory, which emphasizes the role of search, lacks key mechanisms that could be implemented by the type of pattern recognition proposed by Chase and Simon (1973)
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