1,738 research outputs found
Rational physical agent reasoning beyond logic
The paper addresses the problem of defining a theoretical physical agent framework that satisfies practical requirements of programmability by non-programmer engineers and at the same time permitting fast realtime operation of agents on digital computer networks. The objective of the new framework is to enable the satisfaction of performance requirements on autonomous vehicles and robots in space exploration, deep underwater exploration, defense reconnaissance, automated manufacturing and household automation
Differences in the Angular Dependencies of Spin- and Symmetry-Forbidden Excitation Cross Sections by Low-Energy Electron Impact Spectroscopy
Optically forbidden electronic transitions can be produced by low-energy electron impact. Recent experimental investigations of helium (1-3) have shown that the differential scattering cross sections for forbidden excitations are generally enhanced relative to those for allowed ones at low incident energies and large scattering angles.
We have now observed marked differences in the angular and energy dependencies of differential cross sections for various kinds of forbidden (spin, symmetry, or both) transitions in helium at low incident energies. Such differences may well provide a basis for determining the nature of optically forbidden transitions detected by electron-impact spectroscopy in other atoms and molecules
Comments on a Major Range Extension of the Little-Known Acrocera bakeri (Diptera: Acroceridae)
The spider fly Acrocera bakeri Coquillett, 1904 (Diptera: Acroceridae) is reported as a new state record for Wisconsin. This is a major range extension, because this rarely-encountered species was previously known only from the western U.S., specifically Arizona, California, and Nevada. The taxonomic history of the species is briefly discussed and hypotheses are offered for its unexpected presence in Wisconsin
Kulonbozo oktatasi rendszerek es formak kozotti tudastranszfer es annak merhetosege
Az informáciĂł megszerzĂ©se Ă©s átadása sohasem volt olyan nagy jelentĹ‘sĂ©gű mint napjainkban. Aki a legfrissebb, legmagasabb szintű informáciĂłval rendelkezik az elĹ‘nyre tesz versenytársaival szemben. Igy Ă©rthetĹ‘, hogy a gazdaság Ă©s az erĹ‘södĹ‘ piaci verseny egyre nagyobb nyomást gyakorol az oktatási intĂ©zmĂ©nyekre is. A vásárlĂłk (hallgatĂłk) a világ minden táján kritikusan figyelik, hogy a pĂ©nzĂĽkĂ©rt naprakĂ©sz tudást kapnak-e. Az oktatási intĂ©zmĂ©nyeket (közĂ©piskolákat Ă©s egyetemeket) Nagy-Britanniában pĂ©ldául rangsorolják mind az oktatás szĂnvonala, mind a kutatásban elĂ©rt eredmĂ©nyei alapján. Ezek az informáciĂłk megjelennek a napilapokban Ă©s egyĂ©rtelműen jelzik az adott intĂ©zmĂ©ny rangját Ă©s a kibocsátott diploma piaci Ă©rtĂ©kĂ©t. Az egyre erĹ‘södĹ‘ hallgatĂłkĂ©rt törtĂ©nĹ‘ versenyben tehát igen fontos szerepe van a naprakĂ©sz tudásnak Ă©s a több terĂĽleten is felhasználhatĂł kĂ©szsĂ©gek oktatásának. A felsĹ‘oktatás egyre inkább szolgáltatĂł nagyĂĽzemmĂ© válik, amely igyekszik minĂ©l gyorsabban reagálni a piac igĂ©nyeire. A piac nagy választĂ©kot, rugalmas formákat Ă©s egymásra Ă©pĂthetĹ‘sĂ©get kĂván, Ăgy az egyetemek tárgyai legtöbb helyen már modulokbĂłl Ă©pĂĽlnek fel, ahol a hallgatĂłnak a kötött tantárgyak mellett választhatĂł tantárgyaik is vannak.
Másik világjelensĂ©g az egĂ©sz Ă©leten keresztĂĽl tartĂł folyamatos tanulás igĂ©nye. Elfogadott tĂ©ny, hogy bár kĂĽlönbözĹ‘ idĹ‘ alatt szakterĂĽlettĹ‘l fĂĽggĹ‘en elavul a tudás. Igy a diploma csak egy állomása, de nem a vĂ©gállomása a tanulásnak. Hogyan tudnak az oktatási intĂ©zmĂ©nyek megfelelni az egyre növekvĹ‘ számĂş elsĹ‘ diplomás kĂ©pzĂ©sĂ©nek Ă©s egy idĹ‘ben hogyan tudják kielĂ©gĂteni a posztgraduális hosszabb, rövidebb ideig tartĂł kĂ©pzĂ©sek iránti igĂ©nyt.
Ez a dilemma jelen van a nyugati Ă©s a keleti oktatási intĂ©zmĂ©nyekben egyaránt. A lĂ©nyeges kĂĽlönbsĂ©g a rendelkezĂ©sre állĂł idĹ‘ben van. Ami Nagy Britanniában pĂ©ldául mintegy ötven Ă©v alatt zajlott le az Magyarországon megprĂłbál megtörtĂ©nni tĂz Ă©v alatt. A felgyorsulás Ă©rzĂ©keltetĂ©sĂ©re talán cĂ©lszerű röviden vĂ©gigtekintenĂĽnk a brit oktatásban vĂ©gbemenĹ‘ változásokat az elmĂşlt ötven Ă©vben. Ha ezt párhuzamba állĂtjuk a magyarországi 1990-töl 2000-ig terjedĹ‘ tĂz esztendĹ‘ fĹ‘bb lĂ©pĂ©seivel elgondolkodtatĂł kĂ©pet kapunk
Continuum EoS for QCD with Nf=2+1 flavors
We report on a continuum extrapolated result [arXiv:1309.5258] for the
equation of state (EoS) of QCD with dynamical quark flavors. In this
study, all systematics are controlled, quark masses are set to their physical
values, and the continuum limit is taken using at least three lattice spacings
corresponding to temporal extents up to . A Symanzik improved gauge and
stout-link improved staggered fermion action is used. Our results are available
online [ancillary file to arXiv:1309.5258].Comment: Conference proceedings, 7 pages, 4 figures. Talk presented at 31st
International Symposium on Lattice Field Theory (LATTICE 2013), July 29 -
August 3, 2013, Mainz, German
Static quark-antiquark pair free energy and screening masses: continuum results at the QCD physical point
We study the correlators of Polyakov loops, and the corresponding gauge
invariant free energy of a static quark-antiquark pair in 2+1 flavor QCD at
finite temperature. Our simulations were carried out on = 6, 8, 10, 12,
16 lattices using a Symanzik improved gauge action and a stout improved
staggered action with physical quark masses. The free energies calculated from
the Polyakov loop correlators are extrapolated to the continuum limit. For the
free energies we use a two step renormalization procedure that only uses data
at finite temperature. We also measure correlators with definite Euclidean time
reversal and charge conjugation symmetry to extract two different screening
masses, one in the magnetic, and one in the electric sector, to distinguish two
different correlation lengths in the full Polyakov loop correlator. This
conference contribution is based on the paper: JHEP 1504 (2015) 138Comment: 7 pages, 4 figures. Talk presented at the 33rd International
Symposium on Lattice Field Theory (Lattice 2015), 14-18 July 2015, Kobe
International Conference Center, Kobe, Japa
QCD transition temperature: full staggered result
We conclude our investigations on the QCD cross-over transition temperatures
with 2+1 staggered flavours and one-link stout improvement. We extend our
previous two studies [Phys. Lett. B643 (2006) 46, JHEP 0906:088 (2009)] by
choosing even finer lattices (N_t=16) and we work again with physical quark
masses. These new results [for details see JHEP 1009:073,2010] support our
earlier findings. We compare them with the published results of the hotQCD
collaboration. All these results are confronted with the predictions of the
Hadron Resonance Gas model and Chiral Perturbation Theory for temperatures
below the transition region. Our results can be reproduced by using the
physical spectrum. The findings of the hotQCD collaboration can be recovered
only by using a distorted spectrum. This analysis provides a simple explanation
for the observed discrepancy in the transition T between our and the hotQCD
collaborations.Comment: presented at the XXVIII. International Symposium on Lattice Field
Theory, June 14-19,2010, Villasimius, Sardinia Ital
Recent results on the Equation of State of QCD
We report on a continuum extrapolated result (arXiv:1309.5258) for the
equation of state (EoS) of QCD with dynamical quark flavors and
discuss preliminary results obtained with an additional dynamical charm quark
(). For all our final results, the systematics are controlled, quark
masses are set to their physical values, and the continuum limit is taken using
at least three lattice spacings corresponding to temporal extents up to
.Comment: Conference proceedings: The 32nd International Symposium on Lattice
Field Theory - Lattice 2014, June 23-28, 2014, Columbia University, New York,
New Yor
Analysis and design of a capsule landing system and surface vehicle control system for Mars exploration
Problems related to an unmanned exploration of the planet Mars by means of an autonomous roving planetary vehicle are investigated. These problems include: design, construction and evaluation of the vehicle itself and its control and operating systems. More specifically, vehicle configuration, dynamics, control, propulsion, hazard detection systems, terrain sensing and modelling, obstacle detection concepts, path selection, decision-making systems, and chemical analyses of samples are studied. Emphasis is placed on development of a vehicle capable of gathering specimens and data for an Augmented Viking Mission or to provide the basis for a Sample Return Mission
Analysis and design of a capsule landing system and surface vehicle control system for Mars exploration
Problems related to the design and control of a mobile planetary vehicle to implement a systematic plan for the exploration of Mars are reported. Problem areas include: vehicle configuration, control, dynamics, systems and propulsion; systems analysis, terrain modeling and path selection; and chemical analysis of specimens. These tasks are summarized: vehicle model design, mathematical model of vehicle dynamics, experimental vehicle dynamics, obstacle negotiation, electrochemical controls, remote control, collapsibility and deployment, construction of a wheel tester, wheel analysis, payload design, system design optimization, effect of design assumptions, accessory optimal design, on-board computer subsystem, laser range measurement, discrete obstacle detection, obstacle detection systems, terrain modeling, path selection system simulation and evaluation, gas chromatograph/mass spectrometer system concepts, and chromatograph model evaluation and improvement
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