27,522 research outputs found
The use of lasers for hydrographic studies
The utilization of remote laser sensors in water pollution detection and identification, coastal environmental monitoring, and bathymetric depth sounding, is discussed. q
Compact strain-sensitive flexible photonic crystals for sensors
A promising fabrication route to produce absorbing flexible photonic crystals is presented, which exploits self-assembly during the shear processing of multi-shelled polymer spheres. When absorbing material is incorporated in the interstitial space surrounding high-refractive-index spheres, a dramatic enhancement in the transmission edge on the short-wavelength side of the band gap is observed. This effect originates from the shifting optical field spatial distribution as the incident wavelength is tuned around the band gap, and results in a contrast up to 100 times better than similar but nonabsorbing photonic crystals. An order-of-magnitude improvement in strain sensitivity is shown, suggesting the use of these thin films in photonic sensors
Performance of Major Flare Watches from the Max Millennium Program (2001-2010)
The physical processes that trigger solar flares are not well understood and
significant debate remains around processes governing particle acceleration,
energy partition, and particle and energy transport. Observations at high
resolution in energy, time, and space are required in multiple energy ranges
over the whole course of many flares in order to build an understanding of
these processes. Obtaining high-quality, co-temporal data from ground- and
space- based instruments is crucial to achieving this goal and was the primary
motivation for starting the Max Millennium program and Major Flare Watch (MFW)
alerts, aimed at coordinating observations of all flares >X1 GOES X-ray
classification (including those partially occulted by the limb). We present a
review of the performance of MFWs from 1 February 2001 to 31 May 2010,
inclusive, that finds: (1) 220 MFWs were issued in 3,407 days considered (6.5%
duty cycle), with these occurring in 32 uninterrupted periods that typically
last 2-8 days; (2) 56% of flares >X1 were caught, occurring in 19% of MFW days;
(3) MFW periods ended at suitable times, but substantial gain could have been
achieved in percentage of flares caught if periods had started 24 h earlier;
(4) MFWs successfully forecast X-class flares with a true skill statistic (TSS)
verification metric score of 0.500, that is comparable to a categorical
flare/no-flare interpretation of the NOAA Space Weather Prediction Centre
probabilistic forecasts (TSS = 0.488).Comment: 19 pages, 2 figures, accepted for publication in Solar Physic
Domain Event Driven pada Aplikasi Komputer Catur: Logika Catur
Currently the chess computer has evolved in such way that many of the elements that exist in the application of computer chess can be separated and placed in another application. As an example of the chess engine that focuses only on the application\u27s artificial intelligence. There is also a GUI that focus solely on board and chess pieces in the absence of rules so that it can be used as another application as chess interface. By using domain event driven point of views, we can look at that elements in an application can be separated according to their domain. It\u27s intended to define the domain rules of chess as one of the elements that can be used during the development of computer chess application. By focusing on the rules of chess as a domain we can create a library (library) application to be used as a reference by other application\u27s elements forming an application. The library\u27s rules of chess can be called chess logic
Heavy-light meson in anisotropic lattice QCD
We examine whether the improved quark action on anisotropic lattices
can be used as a framework for the heavy quark, which enables precision
computation of matrix elements of heavy-light mesons. To this end, it is
crucial to verify that a mass independent and nonperturbative tuning of the
parameters is possible. As a first step, we observe the dispersion relation of
heavy-light mesons on a quenched lattice using the action which is
nonperturbatively tuned only for the leading terms. On a lattice with the
spatial cutoff 1.6 GeV and the anisotropy , the
relativity relation holds within 2% accuracy in the quark mass region with the bare anisotropy parameter tuned for the massless quark.
We also apply the action to a calculation of heavy-light decay constants in the
charm quark mass region.Comment: Lattice2002(heavyquark), 3 pages, 2 figure
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