cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Observation of Retardation Effects in the Spectrum of Two-Dimensional Plasmons
Creators: name: Kukushkin, I. V.
name: Smet, J. H.
name: Mikhailov, Sergey A.
name: Kulakovskii, D. V.
name: Klitzing, Klaus von
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2003
Subjects: subject: gallium arsenide, aluminium compounds, III-V semiconductors, semiconductor heterojunctions, two-dimensional electron gas, quantum Hall effect, semiconductor quantum dots, membranes
subject: 530 Physik
subject: 73.20.Mf, 71.36.+c

description: Retardation effects, theoretically predicted more than 35 years ago, are observed in the spectrum of two-dimensional plasmons in high-electron-mobility GaAs/AlGaAs quantum wells. In zero magnetic field, a strong reduction of the resonant plasma frequency is observed due to the hybridization of the plasma and light modes. In a perpendicular magnetic field B, hybrid cyclotron-plasmon modes appear with a very unusual dependence of the frequency on B field. Experimental results are in excellent agreement with the theory.
Degradation Analysis of InGaN Laser Diodes
Creators: name: Kümmler, V.
name: Brüderl, G.
name: Bader, S.
name: Miller, S.
name: Weimar, A.
name: Lell, A.
name: Härle, V.
name: Schwarz, Ulrich
name: Gmeinwieser, Nikolaus
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: 530 Physik
subject: 42.55.Px; 78.45.+h; 78.60.Fi

description: The current status of InGaN-MQW-laser diodes developed at Osram OS is presented. These lasers are grown on n-conducting SiC, enabling a vertical current path, cleaved facets and excellent heat spreading. The temperature rise during cw operation is measured for different mountings. A p-side up mounted diode with thermal resistance of 18 K/W showed 143 h of cw lasing at 1 mW optical power (T = 25 °C). DC and pulsed aging shows current as main degradation reason compared to heat for InGaN-LDs. Photoluminescence spectra of the quantum wells are being compared before and after degradation caused by current.
In situ control of electron gas dimensionality in freely suspended semiconductor membranes
Creators: name: Höhberger, Eva M.
name: Krämer, Tomas
name: Wegscheider, Werner
name: Blick, Robert H.
Publisher: name: Universität Regensburg
Year: 2003
Subjects: subject: gallium arsenide, aluminium compounds, III-V semiconductors, semiconductor heterojunctions, two-dimensional electron gas, quantum Hall effect, semiconductor quantum dots, membranes
subject: 530 Physik
subject: 73.61.Ey; 73.40.Kp; 73.43.-f;73.21.La

description: We present fabrication and measurements of gated suspended low-dimensional electron systems. The core component of the device is a low-dimensional electron gas embedded in a free-standing beam processed from a GaAs/AlGaAs heterostructure. The dimensionality of the electronic system is fully controlled by a number of gating electrodes on the suspended membranes. Operation in the quantum Hall regime, in the one-dimensional case, and as zero-dimensional quantum dots is demonstrated. The resulting devices can be applied as ultrasensitive bolometers and as nanoelectromechanical circuits that reach the ultimate limits of displacement detection.
title: Towards the Potential Space: Addressing the influences that hamper and occlude an actor’s potency and their remediation through psychophysical approaches to learning
Creators: name: Smart, Roger
Publisher: name: Goldsmiths, University of London
Year: 2018

description: When considering the efficacy of modalities of actor training it is unproductive to consider them as abstract theories applied to generic actors. A meaningful evaluation must take into account the cultural milieu in which the training takes place, and the manner in which acculturation has shaped an individual actor’s sense of self prior to entering training.
 
Achieving optimal levels of creativity and authenticity in co-regulated relationships between actors-in-role, can be achieved through a process of stripping away an actor’s blocks. Such a process is often characterised by patterns of resistance that can be traced to: reified beliefs regarding the hierarchical bifurcation of body and mind; the nature and function of emotion; an actor’s familial history; the degree to which an actor perceives deep transformative learning as threatening; and the climate in which the learning process takes place.
 
By adopting perspectives drawn from evolutionary biology, emotions are reconceived as functional and adaptive, a perspective that reframes an actor’s resistance to their experience of transformative learning as a plausible, rather than pathological, response. In this paradigm, psychophysical approaches to actor training must address both the physical and conceptual dimensions of an actor’s sub-optimal behaviours. Enhancing an actor’s emotional intelligence and self-efficacy beliefs is central to this process.
 
Transformative learning spaces are learner-centered rather than teacher-centered; dialogic rather than didactic; cooperative rather than competitive; and compassionate rather than coercive. Such spaces place an emphasis on learning through the relationship between actor and training, and between the actors themselves. Transformative learning spaces foster learning through cycles of experience and reflection. In so doing, transformational learning diminishes social comparisons, competition, perfectionism and anxiety, and promotes mutual trust and responsibility, risk-taking, and a capacity to tolerate the uncertainty inherent in an improvisatory approach to co-regulated relationships between on-stage characters.
Magnetotransport in variable-coupling one-dimensional ballistic constrictions
Creators: name: Roddaro, Stefano
name: Piazza, Vincenzo
name: Beltram, Fabio
name: Wegscheider, Werner
name: Liang, Chi-Te
name: Pepper, Michael
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: galvanomagnetic effects, aluminium compounds, gallium arsenide, III-V semiconductors, semiconductor quantum wells, semiconductor quantum wires, electron mobility, lithography, nanotechnology
subject: 530 Physik
subject: 73.63.Nm; 72.20.My; 81.07.Vb; 81.16.Nd; 85.40.Hp

description: A scheme to produce closely spaced high-quality one-dimensional electronic channels is presented. It is based on standard nanolithography fabrication applied to a single, wide quantum well AlGaAs/GaAs heterostructure where the spatial separation of the wire modes is given by Coulomb repulsion. The lack of a composition-induced barrier in the double layer leads to electron mobility of 5×106 cm2/Vs in the starting double two-dimensional system. This in turn yields high-quality one-dimensional channels following nanolithography, as shown by our detailed analysis of the magnetotransport properties of the system. Variable coupling is achieved by split-gate polarization and external magnetic-field intensity and orientation. The relevance for the implementation of coherent nanodevices of this fabrication approach is discussed.
Planar Hall sensors for micro-Hall magnetometry
Creators: name: Rahm, Michael
name: Raabe, Jörg
name: Pulwey, Ralph
name: Biberger, Josef
name: Wegscheider, Werner
name: Weiss, Dieter
name: Meier, C.
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: gallium arsenide, aluminium compounds, III-V semiconductors, semiconductor heterojunctions, Hall effect, magnetometers, magnetic field measurement, magnetisation reversal, oxygen, ion implantation, two-dimensional electron gas, Hall effect devices, nickel, magnetic particles, ferromagnetic materials
subject: 530 Physik
subject: 07.55.Ge; 07.55.Jg; 75.50.Cc; 75.50.Tt; 75.60.Jk; 61.72.Ww; 61.80.Jh;

description: In this work we present a new method to fabricate planar Hall sensors from GaAs–AlGaAs heterojunctions, which can be used to examine the local stray field at a specific section of a micron-sized magnet. Instead of mesa etching we implanted oxygen ions with an energy of 1.5 keV which deplete the two-dimensional electron gas underneath the exposed areas but leave the wafer flat. Planar double Hall cross devices were employed to investigate 30 nm thick electroplated Ni rings with outer and inner diameters ranging from 1.2 to 2 µm and from 0.3 to 1.6 µm, respectively. By comparing the signals from both Hall crosses of the sensor, we can distinguish between local stray field variations and changes of the global magnetization pattern. A hysteresis loop measured at a temperature of 110 K suggests that magnetization reversal occurs via a magnetic vortex structure.
From Quantum Hall Ferromagnetism to Huge Longitudinal Resistance at the 2/3 Fractional Quantum Hall State
Creators: name: Kraus, Stefan
name: Stern, O.
name: Lok, J. G. S.
name: Dietsche, W.
name: Klitzing, Klaus von
name: Bichler, Max
name: Schuh, Dieter
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: 530 Physik
subject: 73.43.–f, 73.21.–b

description: We observe the transition from a spin-unpolarized to a polarized ν=2/3 fractional quantum Hall state at low currents (<5 nA), recently described in terms of quantum Hall ferromagnetism, versus density and parallel magnetic field. At larger currents the time and current dependent huge longitudinal resistance (HLR) is always initiated at the transition. Transport in the HLR regime is linear and the amount of current-induced nuclear polarization in the HLR is comparable to the thermal nuclear polarization at ≈20 mK and 10 T. A current-induced disorder in the nuclear polarization is speculated to cause the enhanced resistance in the HLR regime.
Kondo Effect in a Few-Electron Quantum Ring
Creators: name: Keyser, U. F.
name: Fühner, C.
name: Borck, S.
name: Haug, R. J.
name: Bichler, Max
name: Abstreiter, Gerhard
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2003
Subjects: subject: 530 Physik
subject: 72.15.Qm, 73.21.La, 73.23.Hk, 73.40.Gk

description: A small quantum ring with less than ten electrons was studied by transport spectroscopy. For strong coupling to the leads a Kondo effect is observed and used to characterize the spin structure of the system in a wide range of magnetic fields. At small magnetic fields Aharonov-Bohm oscillations influenced by Coulomb interaction appear. They exhibit phase jumps by π at the Coulomb-blockade resonances. Inside Coulomb-blockade valleys the Aharonov-Bohm oscillations can also be studied due to the finite conductance caused by the Kondo effect. Astonishingly, the maxima of the oscillations show linear shifts with increasing magnetic field and gate voltage.
Chaos and open orbits in hole-antidot arrays with non-isotropic Fermi surface
Creators: name: Zitzelsperger, M.
name: Onderka, Roland
name: Suhrke, Michael
name: Rössler, Ulrich
name: Weiss, Dieter
name: Wegscheider, Werner
name: Bichler, Max
name: Winkler, R.
name: Hirayama, Y.
name: Muraki, K.
Publisher: name: Universität Regensburg
Year: 2003
Subjects: subject: 530 Physik
subject: 73.50.Jt, 73.61.Ey, 73.63-b

description: Periodic antidot arrays imposed upon two-dimensional hole systems (2DHSs) display a striking dependence of the positive low-field magnetoresistance on the in-plane crystallographic orientation of the superlattice. An enhanced positive magnetoresistance can be ascribed to the 2DHSs non-circular Fermi surface which stabilizes chaotic trajectories for specific crystallographic directions. The effect provides a first example of the role of non-spherical Fermi surfaces on the classical chaotic dynamics of charge carriers. Transport calculations taking into account both the classical chaotic motion of the holes in antidot lattices and the warped Fermi contour confirm this picture.
Transfer of spin orientation into electric current in quantum wells
Creators: name: Ganichev, Sergey
name: Ivchenko, Eugenious
name: Danilov, Sergey
name: Sollinger, M.
name: Eroms, Jonathan
name: Wegscheider, Werner
name: Weiss, Dieter
name: Prettl, Wilhelm
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: Circular photogalvanic effect; Monopolar spin polarization
subject: 530 Physik

description: A monopolar spin polarization has been achieved in quantum well structures applying terahertz circularly polarized radiation. The spin polarization results in a directed motion of free carriers in the plane of a quantum well perpendicularly to the direction of light propagation. Due to spin selection rules the direction of the current is determined by the helicity of the light and can be reversed by switching the helicity from right- to left handed.
Exploring the Nature of the Brightest Hyper-luminous X-ray Source
Creators: name: Farrell, Sean
name: Servillat, Mathieu
name: Wiersema, Klaas
name: Barret, Didier
name: Godet, Olivier
name: Heywood, Ian
name: Maccarone, Thomas
name: Oates, Samantha
name: Plazolles, Bastien
name: Webb, Natalie
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The small subset of hyper-luminous X-ray sources with luminosities in excess of ~1E41 erg/s are hard to explain without the presence of an intermediate mass black hole, as significantly super-Eddington accretion and/or very small beaming angles are required. The recent discovery of HLX-1, the most luminous object in this class with a record breaking luminosity of ~1E42 erg/s in the galaxy ESO 243-49, therefore currently provides some of the strongest evidence for the existence of intermediate mass black holes. HLX-1 is almost an order of magnitude brighter than the other hyper-luminous sources, and appears to exhibit X-ray spectral and flux variability similar to Galactic stellar mass black hole X-ray binaries. In this paper we review the current state of knowledge on this intriguing source and outline the results of multi-wavelength studies from radio to ultra-violet wavelengths, including imaging and spectroscopy of the recently identified optical counterpart obtained with the Very Large Telescope. These results continue to support an intermediate mass black hole in excess of 500 Msun
description: 6 pages, 6 figures. Accepted for publication in the Astronomische Nachrichten, to appear in the proceedings of the conference "Ultra-Luminous X-ray sources and Middle Weight Black Holes" (Madrid, May 24-26, 2010)
Integrating suspended quantum dot circuits for applications in nanomechanics
Creators: name: Kirschbaum, J.
name: Höhberger, E. M.
name: Blick, Robert H.
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: aluminium compounds, gallium arsenide, III-V semiconductors, semiconductor quantum dots, Coulomb blockade, displacement measurement, micromechanical resonators, microsensors
subject: 530 Physik
subject: 85.85.+j; 07.07.Df; 07.10.Cm; 73.23.Hk; 06.30.Bp;

description: We present an integrated nanoelectromechanical circuit designed for achieving ultrasensitive displacement detection. It consists of a suspended quantum dot defined in the two-dimensional electron system of an AlGaAs/GaAs heterostructure and a mechanical resonator located in close vicinity. Operation of the individual components is demonstrated: Mechanical as well as transport properties of the resonator and the electron system are specified, respectively. Coulomb blockade in a freely suspended quantum dot is revealed. The data are used to estimate the maximum displacement sensitivity of the device to be 0.029 Å/sqrt(Hz).
AzTEC millimeter survey of the COSMOS field - III. Source catalog over 0.72 sq. deg. and plausible boosting by large-scale structure
Creators: name: Aretxaga, I.
name: Wilson, G. W.
name: Aguilar, E.
name: Alberts, S.
name: Scott, K. S.
name: Scoville, N.
name: Yun, M. S.
name: Austermann, J.
name: Downes, T. P.
name: Ezawa, H.
name: Hatsukade, B.
name: Hughes, D. H.
name: Kawabe, R.
name: Kohno, K.
name: Oshima, T.
name: Perera, T. A.
name: Tamura, Y.
name: Zeballos, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a 0.72 sq. deg. contiguous 1.1mm survey in the central area of the COSMOS field carried out to a 1sigma ~ 1.26 mJy/beam depth with the AzTEC camera mounted on the 10m Atacama Submillimeter Telescope Experiment (ASTE). We have uncovered 189 candidate sources at a signal-to-noise ratio S/N >= 3.5, out of which 129, with S/N >= 4, can be considered to have little chance of being spurious (< 2 per cent). We present the number counts derived with this survey, which show a significant excess of sources when compared to the number counts derived from the ~0.5 sq. deg. area sampled at similar depths in the Scuba HAlf Degree Extragalactic Survey (SHADES, Austermann et al. 2010). They are, however, consistent with those derived from fields that were considered too small to characterize the overall blank-field population. We identify differences to be more significant in the S > 5 mJy regime, and demonstrate that these excesses in number counts are related to the areas where galaxies at redshifts z < 1.1 are more densely clustered. The positions of optical-IR galaxies in the redshift interval 0.6 < z < 0.75 are the ones that show the strongest correlation with the positions of the 1.1mm bright population (S > 5 mJy), a result which does not depend exclusively on the presence of rich clusters within the survey sampled area. The most likely explanation for the observed excess in number counts at 1.1mm is galaxy-galaxy and galaxy-group lensing at moderate amplification levels, that increases in amplitude as one samples larger and larger flux densities. This effect should also be detectable in other high redshift populations.
description: 21 pages, 17 figures, accepted for publication in MNRAS
Replacing the Breit-Wigner amplitude by the complex delta function to describe resonances
Creators: name: de la Madrid, R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Whenever the Breit-Wigner amplitude appears in a calculation,there are many instances (e.g., Fermi's two-level system and the Weisskopf-Wigner approximation) where energy integrations are extended from the scattering spectrum of the Hamiltonian to the whole real line. Such extensions are performed in order to obtain a desirable, causal result. In this paper, we recall several of those instances and show that substituting the Breit-Wigner amplitude by the complex delta function allows us to recover such desirable results without having to extend energy integrations outside of the scattering spectrum.
description: Invited, refereed contribution to the proceedings of the YKIS2009 workshop, Kyoto, Japan.
Ecological responses to ocean acidification by developing marine fouling communities
Creators: name: Brown, Norah Elizabeth Maclean
Publisher: name: University of British Columbia
Year: 2018

description: Increasing levels of CO₂ in the atmosphere are rapidly affecting ocean chemistry, leading to increased acidification (i.e., decreased pH) and reductions in calcium carbonate saturation state. This phenomenon, known as ocean acidification, poses a serious imminent threat to marine species, especially those that use calcium carbonate. In this dissertation, I use a variety of methods (field-based experiments, surveys, meta-analysis) to understand how marine communities respond to both natural and experimental CO₂ enrichment and how responses could be shaped by species interactions or food availability. I found that ocean acidification influenced community assembly, recruitment, and succession to create homogenized, low diversity communities. I found broadly that soft-bodied, weedy taxa (e.g., algae and ascidians) had an advantage in acidified conditions and outcompeted heavily calcified taxa (e.g., mussels, serpulids) that were more vulnerable to the effects of acidification, although calcified bryozoans and barnacles exhibited mixed responses. Next, I examined an important hypothesis of context dependency in ocean acidification research: that negative responses by calcifiers to high CO₂ could be reduced by higher energy input. I found little support for this hypothesis for species growth and abundance, and in fact found that, for some species, additional food supply exacerbated or brought out the negative effects of CO₂. Further, I found that acidification stress can tip the balance of community composition towards invasion, under resource conditions that enabled the native community to resist invasions. Overall, it is clear that acidification is a strong driving force in marine communities but understanding the underlying energetic and competitive context is essential to predicting climate change responses.
Dark energy equation of state and cosmic topology
Creators: name: Vitenti, S. D. P.
name: Lima, M. P.
name: Reboucas, M. J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The immediate observational consequence of a non-trivial spatial topology of the Universe is that an observer could potentially detect multiple images of radiating sources. In particular, a non-trivial topology will generate pairs of correlated circles of temperature fluctuations in the anisotropies maps of the cosmic microwave background (CMB), the so-called circles-in-the-sky. In this way, a detectable non-trivial spatial topology may be seen as an observable attribute, which can be probed through the circles-in-the-sky for all locally homogeneous and isotropic universes with no assumptions on the cosmological dark energy (DE) equation of state (EOS) parameters. We show that the knowledge of the spatial topology through the circles-in-the-sky offers an effective way of reducing the degeneracies in the DE EOS parameters. We concretely illustrate the topological role by assuming, as an exanple, a Poincaré dodecahedral space topology and reanalyzing the constraints on the parameters of a specific EOS which arise from the supernovae type Ia, baryon acoustic oscillations and the CMB plus the statistical topological contribution.
description: 9 pages, 3 figures
Development and application of a description-based interface for 3D reconstruction
Creators: name: Wu, Kai
Publisher: name: University of British Columbia
Year: 2018

description: Advancements in state-of-the-art 3D reconstruction algorithms have sped ahead of the development of interfaces or application programming interfaces (APIs) for developers, especially to those who are not experts in computer vision. In this thesis, we have designed a novel interface, specifically for 3D reconstruction techniques, which uses a description (covering the conditions of the problem) to allow a user to reconstruct the shape of an object without knowledge of 3D vision algorithms. The interface hides the details of algorithms by using a description of visual and geometric properties of the object. Our interface interprets the description and chooses from a set of algorithms those that satisfy the description. We show that this description can be interpreted to one appropriate algorithm, which can give a successful reconstruction result. We evaluate the interface through a proof of concept interpreter, which interprets the description and invokes one of three underlying algorithms for reconstruction. We demonstrate the link between the description set by the user and the result returned using synthetic and real-world datasets where each object has been imaged with the appropriate setup.
Di-muon measurements in CBM experiment at FAIR
Creators: name: Prakash, A.
name: Bhaduri, P. P.
name: Chattopadhyay, S.
name: Dubey, A.
name: Singh, B. K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The compressed baryonic matter (CBM) experiment at the future FAIR accelerator facility near Darmstadt, Germany, aims at the investigation of baryonic matter at highest net baryon densities but moderate temperatures, by colliding heavy-ions at beam energies from 10 to 45 A GeV. The research program comprises the exploration of some basic landmarks of the QCD phase diagram like transitions from hadronic to partonic phase, the region of first order de-confinement as well as chiral phase transition, and the critical end point. The proposed key observables include the measurement of low mass vector mesons and charmonia, which can be detected via their decay into the di-lepton channel. As the decayed leptons leave the hot and dense fireball without further interactions, hence they provide almost unscathed information about the interior of the collision zone where they are being created. In this paper, we discuss the physics motivation, detector concepts, and the feasibility studies in the di-muon measurements for central Au + Au collisions, with a special reference to the detailed simulation activities performed by the CBM muon group.We also discuss the R&D activities of detector in brief.
description: 4 page,3 figures, Talk presented by A.Prakash at 6th ICPAQGP-10, Goa India (to be published in Nucl.Phys.A)
Two-dimensional electron-gas actuation and transduction for GaAs nanoelectromechanical systems
Creators: name: Tang, H. X.
name: Huang, M. H.
name: Roukes, M. L.
name: Bichler, Max
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: gallium arsenide, III-V semiconductors, micromechanical devices, aluminium compounds, two-dimensional electron gas, nanostructured materials, carrier mobility
subject: 530 Physik
subject: 07.10.Cm; 85.35.-p; 73.61.Ey; 73.50.Dn; 73.50.Gr

description: We have fabricated doubly clamped beams from GaAs/AlGaAs quantum-well heterostructures containing a high-mobility two-dimensional electron gas (2DEG). Applying an rf drive to in-plane side gates excites the beam's mechanical resonance through a dipole–dipole mechanism. Sensitive high-frequency displacement transduction is achieved by measuring the ac emf developed across the 2DEG in the presence of a constant dc sense current. The high mobility of the incorporated 2DEG provides low-noise, low-power, and high-gain electromechanical displacement sensing through combined piezoelectric and piezoresistive mechanisms.
The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
Creators: name: Negrello, Mattia
name: Hopwood, R.
name: De Zotti, G.
name: Cooray, A.
name: Verma, A.
name: Bock, J.
name: Frayer, D. T.
name: Gurwell, M. A.
name: Omont, A.
name: Neri, R.
name: Dannerbauer, H.
name: Leeuw, L. L.
name: Barton, E.
name: Cooke, J.
name: Kim, S.
name: da Cunha, E.
name: Rodighiero, G.
name: Cox, P.
name: Bonfield, D. G.
name: Jarvis, M. J.
name: Serjeant, S.
name: Ivison, R. J.
name: Dye, S.
name: Aretxaga, I.
name: Hughes, D. H.
name: Ibar, E.
name: Bertoldi, F.
name: Valtchanov, I.
name: Eales, S.
name: Dunne, L.
name: Driver, S. P.
name: Auld, R.
name: Buttiglione, S.
name: Cava, A.
name: Grady, C. A.
name: Clements, D. L.
name: Dariush, A.
name: Fritz, J.
name: Hill, D.
name: Hornbeck, J. B.
name: Kelvin, L.
name: Lagache, G.
name: Lopez-Caniego, M.
name: Gonzalez-Nuevo, J.
name: Maddox, S.
name: Pascale, E.
name: Pohlen, M.
name: Rigby, E. E.
name: Robotham, A.
name: Simpson, C.
name: Smith, D. J. B.
name: Temi, P.
name: Thompson, M. A.
name: Woodgate, B. E.
name: York, D. G.
name: Aguirre, J. E.
name: Beelen, A.
name: Blain, A.
name: Baker, A. J.
name: Birkinshaw, M.
name: Blundell, R.
name: Bradford, C. M.
name: Burgarella, D.
name: Danese, L.
name: Dunlop, J. S.
name: Fleuren, S.
name: Glenn, J.
name: Harris, A. I.
name: Kamenetzky, J.
name: Lupu, R. E.
name: Maddalena, R. J.
name: Madore, B. F.
name: Maloney, P. R.
name: Matsuhara, H.
name: Michalowski, M. J.
name: Murphy, E. J.
name: Naylor, B. J.
name: Nguyen, H.
name: Popescu, C.
name: Rawlings, S.
name: Rigopoulou, D.
name: Scott, D.
name: Scott, K. S.
name: Seibert, M.
name: Smail, I.
name: Tuffs, R. J.
name: Vieira, J. D.
name: van der Werf, P. P.
name: Zmuidzinas, J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gravitational lensing is a powerful astrophysical and cosmological probe and is particularly valuable at submillimeter wavelengths for the study of the statistical and individual properties of dusty starforming galaxies. However the identification of gravitational lenses is often time-intensive, involving the sifting of large volumes of imaging or spectroscopic data to find few candidates. We used early data from the Herschel Astrophysical Terahertz Large Area Survey to demonstrate that wide-area submillimeter surveys can simply and easily detect strong gravitational lensing events, with close to 100% efficiency.
description: This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science VOL 330, (Nov 5th, 2010), doi:10.1126/science.1193420
title: Modelling of Emotional Development within Human-Computer-Interaction
Creators: name: Siegert, Ingo
name: Hartmann, Kim
name: Glüge, Stefan
name: Wendemuth, Andreas
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2013

description: Future trends point towards the usage of technical systems as companions, adaptable

to the user's individual skills, preferences and current emotional state. To enable technical

systems to determine a user's emotion, current research focuses on emotion recognition. Besides

emotions, personality and moods are eminent as well. Standard emotion recognizers do not

consider them adequately and therefore neglect a crucial part of user modelling. The challenge

is to gather reliable predictions about the observed emotion of the user and, beyond that,

recognise changes in the users emotional reaction during interaction.

In this paper we present a mood model that incorporates personality traits based on emotionally

labeled data.
Invited Review Electronic properties of nanostructures defined in Ga[Al]As heterostructures by local oxidation
Creators: name: Fuhrer, A.
name: Dorn, A.
name: Lüscher, S.
name: Heinzel, Thomas
name: Ensslin, Klaus
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: atomic force lithography, semiconductor nanostructures, 2DEG
subject: 530 Physik
subject: 71.30.+h, 71.35.-y, 73.21.-b, 78.66.Fd

description: Semiconductor nanostructures are fabricated by local oxidation of Ga[Al]As heterostructures with an atomic force microscope (AFM). The GaAs surface is locally oxidized by applying a bias between the substrate and a conductive AFM tip in a humidity-controlled environment. For high-quality two-dimensional electron gases (2DEGS) located close enough to the sample surface the electrons get depleted below the oxidized regions. This way the plane of a 2DEG can be cut into various conductive areas which are laterally insulated from each other. The realization of several high-quality semiconductor nanostructures is demonstrated. I. Quantum wires are fabricated with smooth and steep potential. II. Quantum dots tuned by in-plane gate electrodes can be operated in the regime, where electrons tunnel sequentially through individual quantum levels. III. Antidot superlattices with high-precision lattice parameters display characteristic features of classical and quantum transport.
The Immirzi Parameter as an Instanton Angle
Creators: name: Mercuri, Simone
name: Randono, Andrew
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Barbero-Immirzi parameter is a one parameter quantization ambiguity underpinning the loop approach to quantum gravity that bears tantalizing similarities to the theta parameter of gauge theories such as Yang-Mills and QCD. Despite the apparent semblance, the Barbero-Immirzi field has resisted a direct topological interpretation along the same lines as the theta-parameter. Here we offer such an interpretation. Our approach begins from the perspective of Einstein-Cartan gravity as the symmetry broken phase of a de Sitter gauge theory. From this angle, just as in ordinary gauge theories, a theta-term emerges from the requirement that the vacuum is stable against quantum mechanical tunneling. The Immirzi parameter is then identified as a combination of Newton's constant, the cosmological constant, and the theta-parameter.
description: 24 pages
HLA-B27 positive Uveitis, with Arthritis and Recurrent Urinary Tract Infections – A Case Report.
Creators: name: EDITOR IJOMCR
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Uveitis
subject: HLA-B27 Antigen
subject: Urinary Tract Infections
subject: Sarcoidosis

description: Uveitis is known for its association with HLA-B27 as well as systemic autoimmune diseases including sarcoidosis and arthritis. However, association of uveitis with recurrent lower urinary tract infections without kidney disease or involvement is not established or commonly seen. Here is documented a case of an elderly female patient with multiple episodes of urinary tract infections, and uveitis, who was positive for HLA-B27 as well as markers of sarcoidosis.
Tunneling in the quantum Hall regime between orthogonal quantum wells
Creators: name: Huber, Michael
name: Grayson, M.
name: Rother, Martin
name: Deutschmann, R. A.
name: Biberacher, W.
name: Wegscheider, Werner
name: Bichler, Max
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: Quantum Hall effect; Tunneling
subject: 530 Physik
subject: 73.43.Jn; 71.70.Di; 73.40.Gk

description: We present experimental investigations of tunneling between two quantum wells forming a T-shaped structure. At zero magnetic field we observe a nonlinear tunnel characteristic with clearly pronounced negative differential resistance. With magnetic field B, both quantum wells can independently be set in a quantum Hall state. We demonstrate spectroscopy of Quantum Hall bulk states in one B field orientation, and spectroscopy of edge states with the orthogonal orientation. The observed features can be explained assuming that transverse momentum is conserved during tunneling.
Ensinar Cidadania com Arte! Olha Para O Que Eu Faço … Não Olhes Para O Que Eu Digo!/ Teaching Citizenship with Art! Look At What I Do ...Do not Look At What I Say!
Creators: name: Moura, Anabela
name: Barbosa, Gabriela
Publisher: name: Escola Superior de Educação de Paula Frassinetti - CIPAF
Year: 2018
Subjects: Cidadania; Educação para o Desenvolvimento; Aprendizagem de Serviço; Educação Artística

description: Neste artigo são abordadas questões relacionadas com o ensino do conceito de cidadania na Escola Superior de Educação, do Instituto Politécnico de Viana do Castelo, Portugal. Através da análise de práticas artísticas, propomo-nos determinar como conceitos de cultura, património, educação para o desenvolvimento, aprendizagem de serviço e direitos humanos na sociedade são abordados em atividades curriculares e como as perspetivas interdisciplinares são consideradas a via adequada para tais abordagens em termos de Educação Artística na Escola do século XXI

 Teaching Citizenship with Art! Look At What I Do ...Do not Look At What I Say!

Abstract

This article will approach issues related to the teaching of the concept of citizenship according to Higher School of Education of the Polytechnic Institute of Viana do Castelo, Portugal. Through the analysis of artistic practices, we propose to determine how concepts of culture, heritage, education for development, service learning and human rights in society are addressed in curricular activities and how interdisciplinary perspectives are considered the appropriate way to such approaches in terms of Art Education in the 21st Century School.

Keywords: Citizenship; Education for Development; Service - Learning; Artistic Education.
description: Saber & Educar, n. 24 (2018): A Educação Artística na Escola do Século XXI
Impact of smoked water on umami and salt taste
Creators: name: Panchan, Kanokkan
name: Lignou, Stella
name: Griffiths, Huw D.
name: Baines, David A.
name: Parker, Jane K.
Publisher: name: Zenodo
Year: 2022
Subjects: smoked water
taste
umami
salty
discrimination test
3-AFC

description: The aim of this study was to investigate whether the use of smoked ingredients could enhance either salty or umami taste, whether any enhancement was due to taste-active or taste-enhancing compounds, and whether smoky aroma induced taste enhancement. A trained sensory panel (n=12) performed three-Alternative Forced Choice (3-AFC) discrimination tests with nose clips on to assess taste-active and taste-enhancing compounds in smoked water. The first set of 3-AFC discrimination tests investigated whether there were any tastes, particularly salty or umami, in water with addition of 1% of a commercial smoked water. The second set of 3-AFC tests investigated whether the smoked water contained umami-enhancing compounds when mixed with various concentrations of MSG and /or ribonucleotides in water. Set 3 was similar but was carried out in a model chicken soup containing MSG with or without ribonucleotides. Our data show that the addition of smoked water can increase the umami taste in aqueous solutions, but this is masked in more complex matrices. This means we can investigate odour-induced taste enhancement of smoked water, in the knowledge that there will be minimal contribution to the umami and salty taste from the smoked water.
American Press Institute (API)/Associated Press-NORC Center for Public Affairs Research Poll: “My” Media Versus “The” Media: Trust in News Depends on Which News Media You Mean
Creators: name: American Press Institute (API)
Publisher: name: Roper Center for Public Opinion Research
Year: 2019

description: Frequency of respondent's exposure to news (1); trust in information from news media (2); news media does/does not keep respondent well-informed (1); accuracy of news media (1); political news deals fairly with all sides/favors one side (1); criticism from news organizations keeps political leaders from doing their job/keeps political leaders from doing things that should not be done (1); news media too liberal/conservative (1); characteristics of news media respondent uses most often (4); differentiating between opinion content and news reporting is easy/difficult (1).
An efficient, second order method for the approximation of the Basset history force
Creators: name: van Hinsberg, M. A. T.
name: Boonkkamp, J. H. M. ten Thije
name: Clercx, H. J. H.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The hydrodynamic forces exerted by a fluid on small isolated rigid spherical particles are usually well described by the Maxey-Riley (MR) equation. The most time-consuming contribution in the MR equation is the Basset history force which is a well-known problem for many-particle simulations in turbulence. In this paper a novel numerical approach is proposed for the computation of the Basset history force based on the use of exponential functions to approximate the tail of the Basset force kernel. Typically, this approach not only decreases the cpu time and memory requirements for the Basset force computation by more than an order of magnitude, but also increases the accuracy by an order of magnitude. The method has a temporal accuracy of O(Delta t^2) which is a substantial improvement compared to methods available in the literature. Furthermore, the method is partially implicit in order to increase stability of the computation. Traditional methods for the calculation of the Basset history force can influence statistical properties of the particles in isotropic turbulence, which is due to the error made by approximating the Basset force and the limited number of particles that can be tracked with classical methods. The new method turns out to provide more reliable statistical data.
description: 21 pages, 9 figures
Ultracold $O_2$+$O_2$ collisions in a magnetic field: on the role of the potential energy surface
Creators: name: Pérez-Ríos, Jesús
name: Campos-Martínez, José
name: Hernández, Marta I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The collision dynamics of $^{17}O_2(^3Σ_g^-) +^{17}O_2(^3Σ_g^-)$ in the presence of a magnetic field is studied within the close-coupling formalism in the range between 10 nK and 50 mK. A recent global {\em ab initio} potential energy surface (PES) is employed and its effect on the dynamics is analyzed and compared with previous calculations where an experimentally derived PES was used [New J. Phys {\bf 11}, 055021 (2009)]. In contrast to the results using the older PES, magnetic field dependence of the low-field-seeking state in the ultracold regime is characterized by quite a large background scattering length, $a_{bg}$, and, in addition, cross sections exhibit broad and pronounced Feshbach resonances. The marked resonance structure is somewhat surprising considering the influence of inelastic scattering, but it can be explained by resorting to the analytical van der Waals theory, where the short range amplitude of the entrance channel wave function is enhanced by the large $a_{bg}$. This strong sensitivity to the short range of the {\em ab initio} PES persists up to relatively high energies (10 mK). After this study and despite quantitative predictions are very difficult, it can be concluded that the ratio between elastic and spin relaxation scattering is generally small, except for magnetic fields which are either low or close to an asymmetric Fano-type resonance. Some general trends found here, such as a large density of quasibound states and a propensity towards large scattering lengths, could be also characteristic of other anisotropic molecule-molecule systems.
description: 24 pages, 8 figures
Aza-spirocyclic compounds via oxidative amidation of phenols : application on the studies towards the synthesis of himandrine and the total synthesis of Erythrina alkaloids
Creators: name: Paladino, Marco
Publisher: name: University of British Columbia
Year: 2018

description: This thesis illustrates two application of the oxidative amidation of phenols in the synthesis of natural products. The first part focuses on an approach to himandrine via a tandem oxidative cyclization of a phenolic dienylsulfonamide / intramolecular Diels-Alder reaction / epimerization sequence that produces a substituted trans-fused decalone. This material exhibits three of the five rings present in the natural product, but it is made in racemic form. Efforts to prepare said trans-decalone in enantioenriched form are also outlined. The strategy that was explored in that respect relies on a Rh(I)-mediated diastereoselective 1,4-addition of an arylboronic acid to a conjugated ester derived from L-serine. The second part of this dissertation describes the total synthesis of two Erythrina alkaloids, (+)-3-demethoxyerythratidinone and (+)-erysotramidine, via the oxidative cyclization of a phenolic oxazoline. A key step of the synthesis involves the desymmetrization of a dienone through a highly diastereoselective, intermolecular 1,4-addition of the alcohol revealed upon unraveling of the oxazoline. This allows the creation of the aza-spirocenter characteristic of this class of alkaloids with the correct configuration. The degree of stereocontrol achieved in the course of such operations is essentially perfect (no diastereomeric side products detectable). This synthesis also introduces improved techniques to effect a crucial eliminative Curtius-Schmidt rearrangement.
The Distribution of Coalescing Compact Binaries in the Local Universe: Prospects for Gravitational-Wave Observations
Creators: name: Kelley, Luke Zoltan
name: Ramirez-Ruiz, Enrico
name: Zemp, Marcel
name: Diemand, Jürg
name: Mandel, Ilya
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Merging compact binaries are the most viable and best studied candidates for gravitational wave (GW) detection by the fully operational network of ground-based observatories. In anticipation of the first detections, the expected distribution of GW sources in the local universe is of considerable interest. Here we investigate the full phase space distribution of coalescing compact binaries at $z = 0$ using dark matter simulations of structure formation. The fact that these binary systems acquire large barycentric velocities at birth ("kicks") results in merger site distributions that are more diffusely distributed with respect to their putative hosts, with mergers occurring out to distances of a few Mpc from the host halo. Redshift estimates based solely on the nearest galaxy in projection can, as a result, be inaccurate. On the other hand, large offsets from the host galaxy could aid the detection of faint optical counterparts and should be considered when designing strategies for follow-up observations. The degree of isotropy in the projected sky distributions of GW sources is found to be augmented with increasing kick velocity and to be severely enhanced if progenitor systems possess large kicks as inferred from the known population of pulsars and double compact binaries. Even in the absence of observed electromagnetic counterparts, the differences in sky distributions of binaries produced by disparate kick-velocity models could be discerned by GW observatories, within the expected accuracies and detection rates of advanced LIGO--in particular with the addition of more interferometers.
description: 9 pages, 3 figures; Accepted for publication in The Astrophysical Journal Letters
Anomalous dispersion of charged excitons in dilute two-dimensional electron systems at low temperatures
Creators: name: Broocks, Kay-Birger
name: Schröter, Patrick
name: Heitmann, Detlef
name: Heyn, Christian
name: Schüller, Christian
name: Bichler, Max
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: 530 Physik
subject: 71.30.+h, 71.35.-y, 73.21.-b, 78.66.Fd

description: We report the observation of a strong anomaly in the magnetic-field dispersion of negatively charged excitons in dilute two-dimensional electron systems. The anomaly exists in an intermediate density range around 1×1011 cm-2, and at temperatures T<1 K, only. The strength of the anomaly at T=0.1 K is about 2.5 meV, and the most striking feature is that it can be completely destroyed by a small thermal energy of about 0.2 meV (2 K). Furthermore, the anomaly is observed both in photoluminescence and direct absorption measurements, which gives a strong indication that it is of intrinsic origin.
Aharonov–Bohm oscillations of a tuneable quantum ring
Creators: name: Keyser, U. F.
name: Borck, S.
name: Haug, R. J.
name: Abstreiter, Gerhard
name: Bichler, Max
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: 530 Physik

description: Using an atomic force microscope a ring geometry with self-aligned in-plane gates was directly written into a GaAs/AlGaAs heterostructure. Transport measurements in the open regime show only one transmitting mode and Aharonov–Bohm oscillations with more than 50% modulation are observed in the conductance. The tuning via in-plane gates allows one to study the Aharonov–Bohm effect in the whole range from the open ring to the Coulomb-blockade regime.