cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: An easily adaptable Decision Making Framework based on Somatic Markers on the Nao-Robot
Creators: name: Hoefinghoff, Jens
name: Steinert, Laura
name: Pauli, Josef
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2013

description: Decision making is an essential aspect of articial intelligent systems such as

robots. The adaptation to variant applications of decision making approaches often involves the

implementation of previous knowledge and additional changes in the source code. This paper

presents improvements to the implementation of an emotional decision making approach. These

improvements, composed of an expansion of the decision making algorithm and enhancements of

the implementation architecture, ensure a user-friendly and fast adaption to variant applications.
Adiabatic pumping of two-dimensional electrons in a ratchet-type lateral superlattice
Creators: name: Höhberger, E. M.
name: Lorke, A.
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik

description: A pair of interdigitated gates, interlacing off center, is used to generate a widely tunable one-dimensional lateral superlattice in the two-dimensional electron gas at a GaAs/AlGaAs heterointerface. Magnetotransport measurements with statically biased gates demonstrate that the conduction-band modulation is strongly influenced by higher harmonics, thus allowing the realization of both symmetric and ratchet-like periodic potential modulations. Temporally phase-shifted ac biasing of the gates results in adiabatic pumping of electrons. The generated dc current increases linearly with the pumping frequency and can be reversed in situ by inverting the phase shift.
Mathematical modeling of dynamical response of medical cyclotron targets
Creators: name: Jahangiri, Pouyan
Publisher: name: University of British Columbia
Year: 2018

description: The focus of this thesis is to understand the dynamical behavior of fluid targets under proton beam bombardment. Although the reactor-based beam-matter interaction has different applications, the motivation of this work stems from nuclear medicine, i.e. maximizing the yield of radioisotopes for medical diagnoses. This can be improved through increases in heat transfer rates to the cooling fluids. To do so, there is a need to understand the transport mechanisms in the targets during bombardment, an area which is relatively unexplored. In this thesis, we build upon the work of Wojciechowski et al. [64] and Peeples et al. [42–45] and develop a system of equations based on the conservation laws. The complexity of the model is reduced to something which is tractable through volume-averaging technique. Our modeling effort is presented in four different yet complementary studies. In the first and second studies, the model is validated against the pressure-rise of a gas target and is expanded to describe the final response of a liquid target at steadystate. Excellent agreement is achieved in all cases. In the third study, transient behavior of a liquid target is examined. In what we consider unique findings, selfsustained oscillatory behaviors were observed and captured by the model. In the last study, we seek the further limits of the model through a linear stability analysis. The existence, uniqueness, and stability of steady-state points are challenged and the conditions leading to an oscillatory behavior are identified. Finally, this work is the necessary first step in a larger research program to design cyclotron targets.
Spin wave calculation of the field-dependent magnetization pattern around an impurity in Heisenberg antiferromagnets
Creators: name: Shinkevich, Sergey
name: Syljuåsen, Olav F.
name: Eggert, Sebastian
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider the magnetic-field dependent spatial magnetization pattern around a general impurity embedded in a Heisenberg antiferromagnet using both an analytical and a numerical spin wave approach. The results are compared to quantum Monte Carlo simulations. The decay of the magnetization pattern away from the impurity follows a universal form which reflects the properties of the pure antiferromagnetic Heisenberg model. Only the overall magnitude of the induced magnetization depends also on the size of the impurity spin and the impurity coupling.
description: 11 pages, 11 figures
Energy spectra of quantum rings
Creators: name: Fuhrer, A.
name: Lüscher, S.
name: Ihn, Thomas
name: Heinzel, Thomas
name: Ensslin, Klaus
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: Magnetic field; Semiconductors; Fractional quantum Hall effect
subject: 530 Physik

description: Experiments on a nearly spin degenerate two-dimensional electron system reveals unusual hysteretic and relaxational transport in the fractional quantum Hall effect (FQHE) regime. The magnetotransport near the transition between the spin-polarized and spin-unpolarized Image states is accompanied by a complicated series of hysteresis loops reminiscent of a classical ferromagnet. In conjunction with the hysteresis, magnetoresistance can either grow or decay logarithmically in time with remarkable persistence without saturation. These results can be understood in terms of anomalous domain dynamics associated with the spin transition or alternatively in terms of quantum Hall ferromagnet.
Trace formula for a dielectric microdisk with a point scatterer
Creators: name: Hales, Robert F. M.
name: Sieber, Martin
name: Waalkens, Holger
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Two-dimensional dielectric microcavities are of widespread use in microoptics applications. Recently, a trace formula has been established for dielectric cavities which relates their resonance spectrum to the periodic rays inside the cavity. In the present paper we extend this trace formula to a dielectric disk with a small scatterer. This system has been introduced for microlaser applications, because it has long-lived resonances with strongly directional far field. We show that its resonance spectrum contains signatures not only of periodic rays, but also of diffractive rays that occur in Keller's geometrical theory of diffraction. We compare our results with those for a closed cavity with Dirichlet boundary conditions.
description: 39 pages, 18 figures, pdflatex
Ising Ferromagnetism and Domain Morphology in the Fractional Quantum Hall Regime
Creators: name: Smet, J. H.
name: Deutschmann, R. A.
name: Wegscheider, Werner
name: Abstreiter, Gerhard
name: Klitzing, Klaus von
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik
subject: 73.43.-f, 73.21.-b, 73.23.Ad, 73.61.-r

description: The density driven quantum phase transition between the unpolarized and fully spin polarized ν = 2/3 fractional quantum Hall state is accompanied by hysteresis in accord with 2D Ising ferromagnetism and domain formation. The temporal behavior is reminiscent of the Barkhausen and time-logarithmic magnetic after-effects ubiquitous in familiar ferromagnets. It too suggests domain morphology and, in conjunction with NMR, intricate domain dynamics, which is partly mediated by the contact hyperfine interaction with nuclear spins of the host semiconductor.
Towards the relationship between agile software development and work Characteristics
Creators: name: Scheel, Tabea
name: Tchikanmou, Vincent Auriol
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Engineering
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology
subject: Automotive Engineering
subject: FOS: Mechanical engineering
subject: Operations Research, Systems Engineering and Industrial Engineering
subject: Industrial and Organizational Psychology
subject: Organization Development
subject: Electrical and Computer Engineering
subject: scrum
subject: work Characteristics
subject: Agile

description: The history of software development is directly linked to the constant emergence of new methods and processes. Only a few of the newly developed methods are able to establish themselves for the first time and sustain themselves in the long term without becoming obsolete. In the early 2000s, however, a group of software practitioners introduced a new term to characterise new software development methods that were distinct from the state of the art, henceforth called traditional methods. These were not only well received by practitioners, but were also widely adopted, and for a short time were regarded as "... the best thing to happen to software development in recent years" (Cohen et al., 2004). Even today, more than two decades later, the concept of agility has not lost its prestige and continues to dominate the discourse and its influence far beyond the boundaries of software development. With the aim of understanding the success factor of agile software development in terms of the socio-psychological effects it has on employees, this study aims to investigate the relationship between agile software development and work characteristics.
title: Connecting to make a difference
title: social learning and radical collective change in prefigurative online communities
titleType: Subtitle
Creators: name: Cavé, Dorian
Publisher: name: Lancaster University
Year: 2023

description: In view of the current global social and ecological predicament, what
 might constitute relevant forms of radical collective change? What role
 can processes of social learning play in facilitating such change? And to
 what extent are online networks able to support the unfolding of such
 processes?

 This thesis addresses these questions. I first present the results of two
 participatory action research projects, taking place in two different
 prefigurative online communities attempting to bring about very different
 forms of collective change. The first focuses on building a transnational,
 decentralised grassroots economic system as an alternative to global
 capitalism, but struggles to shake free from the toxic influence of global
 financial markets, and from unhelpful ways of relating and organising. The
 second aims to foster self-organisation and new forms of relationality
 between humans and with the rest of the living world, but struggles to
 address the heritage of historical violence and injustice, or to bring
 about visible political change. With the help of the Wenger-Trayner social
 learning theory and evaluation framework, I consider what processes of
 social

 learning have been taking place (or not) in these networks, and their
 outcomes; and what other social change efforts may learn from these
 experiments and their limitations.

 Finally, I present a reflexive account of my own process of learning and
 unlearning through my involvement with these projects and others, with
 regards to the question of what may constitute radical collective change.
 This critical assessment of my own thinking and aspirations leads me to
 argue in favour of decolonial approaches to social change as potentially
 relevant responses to the global predicament.

 This thesis contributes to the understanding of social learning processes
 within prefigurative online communities, and to the practice of social
 change efforts in such contexts.
Transport properties of quantum dots with steep walls
Creators: name: Fuhrer, A.
name: Lüscher, S.
name: Heinzel, Thomas
name: Ensslin, Klaus
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik
subject: 73.23.Hk, 81.07.-b, 73.23.-b

description: Quantum dots are fabricated in a Ga[Al]As heterostructure by local oxidation with an atomic force microscope. This technique, in combination with top gate voltages, allows us to generate small lateral depletion lengths. The confinement is characterized by low-temperature magnetotransport measurements, from which the dots energy spectrum is reconstructed. We find that in small dots the addition spectrum can qualitatively be described within a Fock-Darwin model. For a quantitative analysis, however, a steep-wall confinement has to be considered. In large dots with small lateral depletion length, our measurements indicate that the density of states within Landau level 2 inside the dot is larger than that within Landau level 1, an effect that we interpret in terms of steep walls. Furthermore, we demonstrate that our interpretation is consistent within the charge-density model. The maximum wall steepness achieved is of the order of 0.4 meV/nm.
A Month in the Life of Groupon
Creators: name: Byers, John W.
name: Mitzenmacher, Michael
name: Potamias, Michalis
name: Zervas, Georgios
Publisher: name: arXiv
Year: 2011
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Groupon has become the latest Internet sensation, providing daily deals to customers in the form of discount offers for restaurants, ticketed events, appliances, services, and other items. We undertake a study of the economics of daily deals on the web, based on a dataset we compiled by monitoring Groupon over several weeks. We use our dataset to characterize Groupon deal purchases, and to glean insights about Groupon's operational strategy. Our focus is on purchase incentives. For the primary purchase incentive, price, our regression model indicates that demand for coupons is relatively inelastic, allowing room for price-based revenue optimization. More interestingly, mining our dataset, we find evidence that Groupon customers are sensitive to other, "soft", incentives, e.g., deal scheduling and duration, deal featuring, and limited inventory. Our analysis points to the importance of considering incentives other than price in optimizing deal sites and similar systems.
description: 6 pages
Changes in Sex Steroids and relation with Menopausal Complaints in Women Undergoing Risk-Reducing Salpingo-Oophorectomy. Zenodo Digital Repository 2022.
Creators: name: van Winden, Lennart
name: Vermeulen, Ravi
name: van den Noort, Vincent
name: Gaarenstroom, Katja
name: Kenter, Gemma
name: Brood-van Zanten, Monique
name: van Beurden, Marc
name: van Rossum, Huub
Publisher: name: Zenodo
Year: 2022
Subjects: Menopause
Risk-reducing salpingo oophorectomy
Sex steroids
LC-MS/MS

description: Supplementary material for the manuscript 'Changes in Sex Steroids and relation with Menopausal Complaints in Women Undergoing Risk-Reducing Salpingo-Oophorectomy'
Adversarial Satisfiability Problem
Creators: name: Castellana, Michele
name: Zdeborová, Lenka
Publisher: name: arXiv
Year: 2010
Subjects: subject: Computational Complexity (cs.CC)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We study the adversarial satisfiability problem, where the adversary can choose whether variables are negated in clauses or not in order to make the resulting formula unsatisfiable. This is one case of a general class of adversarial optimization problems that often arise in practice and are algorithmically much harder than the standard optimization problems. We use the cavity method to compute large deviations of the entropy in the random satisfiability problem with respect to the negation-configurations. We conclude that in the thermodynamic limit the best strategy the adversary can adopt is extremely close to simply balancing the number of times every variable is and is not negated. We also conduct a numerical study of the problem, and find that there are very strong pre-asymptotic effects that are due to the fact that for small sizes exponential and factorial growth is hardly distinguishable.
Displacement-based design of reinforced concrete moment resisting frame incorporating cross laminated timber infill and metallic damper connectors
Creators: name: Madheswaran, Jayanthan
Publisher: name: University of British Columbia
Year: 2018

description: This thesis discusses the development of a new innovative reinforced concrete hybrid structure. The hybrid structure consists of reinforced concrete frame incorporated with Cross Laminated Timber (CLT) and metallic damper connections. The seismic design of this proposed system was carried out with the displacement-based design framework and the design was successfully verified. First, this study focused to numerically model the conventional metallic (steel slit) damper and validated with the experimental result using the Abaqus finite element program. Then, to minimize the drawbacks of the conventional damper specimen, a parametric study has been carried out by changing the shape parameters of the damper using the factorial design of experiments. The purpose of conducting a parametric study is to find the appropriate configuration of the damper which can perform well with the proposed hybrid system. Further, the importance of the shape parameter and their interactions in the final response was studied using the response surface method. Secondly, the proposed hybrid system with the metallic damper connection was modeled in Extended Three Dimensional Analysis of Building Systems (ETABS) and then the overall behavior of the system was investigated. In addition, a direct displacement-based design framework was developed for the seismic design of this proposed system. To verify the proposed framework, a 2D six storey hybrid structure was modeled using ETABS. Then, a nonlinear time history analysis was conducted for the modeled structure using 50 set of ground motions to evaluate its performance. The results indicate that the proposed design framework is effective in controlling the displacement of the hybrid system under seismic excitation.
New Nuclear Physics for Big Bang Nucleosynthesis
Creators: name: Boyd, Richard N.
name: Brune, Carl R.
name: Fuller, George M.
name: Smith, Christel J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss nuclear reactions which could play a role in Big Bang Nucleosynthesis (BBN). Most of these reactions involve lithium and beryllium isotopes and the rates for some of these have not previously been included in BBN calculations. Few of these reactions are well studied in the laboratory. We also discuss novel effects in these reactions, including thermal population of nuclear target states, resonant enhancement, and non-thermal neutron reaction products. We perform sensitivity studies which show that even given considerable nuclear physics uncertainties, most of these nuclear reactions have minimal leverage on the standard BBN abundance yields of 6Li and 7Li. Although a few have the potential to alter the yields significantly, we argue that this is unlikely.
description: 13 pages, 6 figures
Phase Diagram of a Quantum Dot with Steep Walls in Strong Magnetic Fields
Creators: name: Fuhrer, A.
name: Lüscher, S.
name: Heinzel, Thomas
name: Ensslin, Klaus
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik
subject: 72.20.My • 73.40.Kp • 73.63.Kv • S7.12

description: We have studied the transport properties of a semiconductor quantum dot with steep walls in the Coulomb blockade regime and under strong magnetic fields with a filling factor between 2 and 4 inside the dot. A striking periodic suppression of Coulomb blockade resonances as a function of gate voltage is found, which reflects the selective coupling of dot states that belong to different Landau levels. The suppressed peaks are recovered under sufficiently high source-drain bias voltages and give rise to a novel type of structure superimposed on the Coulomb diamonds. The measurements are discussed in terms of both the charge density model, and the Fock-Darwin model. We argue that in order to explain the data, a non-parabolic confinement has to be assumed. We also find an alternating structure in the phase diagram and interpret this in terms of a spin effect.
Spin anomalies in the magneto-drag between double layer 2DEGs
Creators: name: Lok, J. G. S.
name: Kraus, Stefan
name: Pohlt, M.
name: Güven, K.
name: Dietsche, W.
name: Klitzing, Klaus von
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: Double layer two-dimensional electron gas; Integer quantum Hall effect; Drag; Spin
subject: 530 Physik

description: We have measured the low temperature magneto-drag between two two-dimensional electron gases (2DEGs). At matched densities, minima at odd filling factor are observed down to fields at which the Zeeman energy is only one tenth of temperature. At mismatched densities a novel 1/B periodic oscillation in the magneto-drag is observed with frequency h/2e times the density mismatch between the 2DEGs. The oscillation causes negative minima when the filling factor difference between the 2DEGs is odd and positive maxima when it is even. An empirical model is presented that assumes a negative contribution to the drag from electrons with anti-parallel spin in each layer and a positive contribution from electrons with parallel spin. The model faithfully reproduces the experimental results at matched as well as mismatched densities.
Signatures of Spin Pairing in Chaotic Quantum Dots
Creators: name: Lüscher, S.
name: Heinzel, Thomas
name: Ensslin, Klaus
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik
subject: 73.23.Hk, 02.40.Xx, 73.21.-b

description: Coulomb blockade resonances are measured in a GaAs quantum dot in which both shape deformations and interactions are small. The parametric evolution of the Coulomb blockade peaks shows a pronounced pair correlation in both position and amplitude, which is interpreted as spin pairing. As a consequence, the nearest-neighbor distribution of peak spacings can be well approximated by a modified bimodal Wigner surmise, in which interactions are taken into account beyond the constant interaction model.
Spin transition and anomalous domain dynamics in the fractional quantum Hall effect
Creators: name: Eom, J.
name: Cho, Hyun-Ick
name: Kang, W.
name: Gossard, A. C.
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: Magnetic field; Semiconductors; Fractional quantum Hall effect
subject: 530 Physik

description: Experiments on a nearly spin degenerate two-dimensional electron system reveals unusual hysteretic and relaxational transport in the fractional quantum Hall effect (FQHE) regime. The magnetotransport near the transition between the spin-polarized and spin-unpolarized Image states is accompanied by a complicated series of hysteresis loops reminiscent of a classical ferromagnet. In conjunction with the hysteresis, magnetoresistance can either grow or decay logarithmically in time with remarkable persistence without saturation. These results can be understood in terms of anomalous domain dynamics associated with the spin transition or alternatively in terms of quantum Hall ferromagnet.
Enhanced magnetization at integer quantum Hall states
Creators: name: Meinel, I.
name: Grundler, D.
name: Heitmann, Detlef
name: Manolescu, Andrei
name: Gudmundsson, V.
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik
subject: 73.21.-b, 73.43.-f, 75.20.-g, 75.30.Cr

description: We report on enhancements in the magnetization of two-dimensional electron systems in the quantum Hall regime. The observed discontinuities in the magnetization exceed the predictions for interacting electrons calculated in the Hartree-Fock approximation where only the exchange enhancement of the energy gaps is taken into account. We attribute the further enhancement to many-body correlation effects, i.e., filling factor dependent screening within the screened Hartree-Fock approximation. With this, the discontinuities in the magnetization no longer reflect the discontinuities of the chemical potential, but its behavior in the vicinity of integer filling factors.
Constructing free actions of p-groups on products of spheres
Creators: name: Klaus, Michele
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We prove that, for p an odd prime, every finite p-group of rank 3 acts freely on a finite complex X homotopy equivalent to a product of three spheres.
Cyclotron resonance at fractional Landau-level fillings
Creators: name: Manger, M. F.
name: Batke, E.
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: A. Heterojunctions; A. Surfaces and interfaces; D. Cyclotron resonance; D. Electron–electron interactions; E. Light absorption and reflection
subject: 530 Physik
subject: 73.20.Dx; 78.20.Ls

description: Distinct shifts of the cyclotron resonance position correlating with various fractional Landau-level fillings were observed for high-mobility electron space-charge layers in GaAs. In the magnetic quantum limit the shifts are reversed for incompressible liquids in the filling factor regimes ν<0.5 and 0.5
Commensurability effects in lateral surface-doped superlattices
Creators: name: Deutschmann, R. A.
name: Stocken, C.
name: Wegscheider, Werner
name: Bichler, Max
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik

description: We fabricate density-modulated two-dimensional electron systems by shallow compensation doping the donor layer of a modulation-doped heterostructure. Zinc acceptor atoms are diffused from the sample surface which is heated by a focused laser beam. Low-temperature magnetotransport experiments provide evidence that high-quality lateral surface superlattices can be fabricated. In weak periodic one-dimensional potentials, commensurability oscillations are recovered, whereas in strong periodic two-dimensional potentials the semiclassically expected antidot resistance resonances are found to dominate the low-field transport. Additionally, the homogeneity of the laser-induced doping is confirmed by magnetic focusing experiments.
Milne-Eddington inversions of the He I 10830 Å Stokes profiles: Influence of the Paschen-Back effect
Creators: name: Sasso, C.
name: Lagg, A.
name: Solanki, S. K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Paschen-Back effect influences the Zeeman sublevels of the He I multiplet at 10830 Å, leading to changes in strength and in position of the Zeeman components of these lines. We illustrate the relevance of this effect using synthetic Stokes profiles of the He I 10830 Å multiplet lines and investigate its influence on the inversion of polarimetric data. We invert data obtained with the Tenerife Infrared Polarimeter (TIP) at the German Vacuum Tower Telescope (VTT). We compare the results of inversions based on synthetic profiles calculated with and without the Paschen-Back effect being included. We find that when taking into account the incomplete Paschen-Back effect, on average 16% higher field strength values are obtained. We also show that this effect is not the main cause for the area asymmetry exhibited by many He I 10830 Stokes V-profiles. This points to the importance of velocity and magnetic field gradients over the formation height range of these lines.
description: Accepted for publication in A&A on Jun 12th 2006
Miniband transport in vertical superlattice field-effect transistors
Creators: name: Deutschmann, R. A.
name: Wegscheider, Werner
name: Rother, Martin
name: Bichler, Max
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik

description: We study the nonequilibrium transport of two-dimensional electrons through a periodic potential. Our samples are fabricated using the cleaved-edge overgrowth technique to provide a vertical field-effect transistor with an undoped GaAs/AlGaAs superlattice channel orthogonal to the current flow. We find a pronounced negative differential resistance, the magnitude of which increases with increasing modulation strength. The data are qualitatively consistent with the Esaki–Tsu transport model in minibands, which we calculate for the given samples. We emphasize the significance of the two-dimensionality of the electron system and the gate to inhibit domain formation. Weak features in the source-drain current are attributed to Bloch-phonon resonances.
Polarization observables and spin-aligned fusion rates in 2H(d,p)3H and 2H(d,n)3He reactions
Creators: name: Deltuva, A.
name: Fonseca, A. C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Nucleon transfer reactions in low-energy deuteron-deuteron scattering are described by solving exact four-particle equations in momentum space. The Coulomb interaction between the protons is included using the screening and renormalization method. Various realistic potentials are used between nucleon pairs. The energy dependence of the differential cross section, analyzing powers, polarizations, spin-transfer coefficient, and the quintet suppression factor is studied.
description: 6 pages, 9 figures, to be published in Phys. Rev. C
Ordens Parciais, Métricas e Teoria dos Códigos
Creators: name: Panek, Luciano
Publisher: name: Zenodo
Year: 2019

description: Em 1987 Niederreiter (ver [14]) apresentou uma generalização do clá-

ssico problema da Teoria dos Códigos: fixados um corpo finito F q e os

parâmetros n > k ≥ 1, determinar a maior distância mı́nima de Ham-

ming dos [n, k] q códigos lineares sobre F q . Em 1995 Brualdi, Graves e

Lawrence (ver [2]) generalizaram as ideias de Niederreiter introduzindo

uma nova famı́lia de métricas induzidas por ordens parciais, as chamadas

métricas de ordem. Naturalmente todos os invariantes métricos básicos

da Teoria dos Códigos passaram a ser investigados neste novo contexto

e o objetivo destas notas será apresentar resumidamente o status atual

destas investigações.
Scaling properties of the Anderson model in the Kondo regime studied by $σG σW$ formalism
Creators: name: Spataru, Catalin D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The symmetric Anderson model for a single impurity coupled to two leads is studied at strong interaction using the GW approximation within the $σG σW$ formalism. We find that the low energy properties show universal scaling behavior in the asymptotic regime. While the GW scaling functions are similar in form to the scaling functions known from the numerically exact solution, they are characterized by a different parameter value indicating that GW fails to describe correctly spin correlations between the impurity and lead electrons. We also compare the GW and exact Kondo scales for a broad range of the interaction strength. In contrast to the exponential behavior shown by the exact solution, the GW Kondo scale depends algebraically on the interaction strength.
description: accepted for publication in Phys. Rev. B
First Light on GRBs with Fermi
Creators: name: Dermer, Charles D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Fermi LAT (Large Area Telescope) and GBM (Gamma ray Burst Monitor) observations of GRBs are briefly reviewed, keeping in mind EGRET expectations. Using gammaγconstraints on outflow Lorentz factors, leptonic models are pitted against hadronic models, and found to be energetically favored. Interpretation of the Fermi data on GRBs helps establish whether GRBs accelerate cosmic rays, including those reaching $\approx 10^{20}$ eV.
description: 9 pages, 2 figures, in Deciphering the Ancient Universe with GRBs, Kyoto, Japan, April 19-23, 2010
Quantum Interference in Artificial Band Structures
Creators: name: Deutschmann, R. A.
name: Wegscheider, Werner
name: Rother, M.
name: Bichler, Max
name: Abstreiter, Gerhard
name: Albrecht, C.
name: Smet, J. H.
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik
subject: 73.61.-r, 71.18.+y, 73.21.-b, 73.50.-h

description: Magnetotransport experiments on two-dimensional electron systems with an atomically precise, one-dimensional potential modulation reveal striking quantum interference oscillations. Within a semiclassical framework, they are recognized either as self-interference along closed orbits, many of them rendered possible by magnetic breakdown between Fermi contour segments of the artificial band structure, or as interference-enhanced backscattering. The known commensurability oscillations appear as a special case of the latter mechanism.
Exploring the possibilities of a post-critical approach to student north-south mobility experiences : a case study of a social innovation and community development program in Fortaleza, Brazil
Creators: name: Sutherland, Ali
Publisher: name: University of British Columbia
Year: 2018

description: North to South mobility experiences are increasingly offered as components of higher education, be it in the form of international service learning or study abroad. While these experiences are often associated with transformation on the part of the participants, the conceptualizations of what this transformation is or could be are dependent on whether it is undertaken through a traditional, critical or post-critical conceptual approach. This study grows out of an identified lack of well-documented alternatives to the dominant (traditional and critical) approaches to North-South mobility experiences in higher education as well as a frustration with scholarly work that is limited to critique. This thesis explores the possibility of a post-critical approach to educational North to South mobility experiences and how this might foster transformation that shifts how participants of the program relate to themselves, others, and knowledge. This thesis aims to investigate how a post-critical conceptualization, as distinct from a traditional or critical one, might contribute to widened possibilities for the North to South mobility encounter in higher education that could allow for dominant narratives and affective patterns to begin to be disrupted. This research study is an intrinsic case study which included participant observation and in-depth semi-structured interviews with participants of the Social Innovation and Community Development program in Fortaleza, Brazil in 2017. The case is a living example of the tensions and paradoxes inherent in North to South mobility experiences. The findings that emerge illustrate the challenges of articulation and challenges of design involved in implementing an educational North to South mobility experience characterized by a post-critical approach. The analysis showed that participants’ experiences of transformation were very much framed within the scripts that are most dominant and available to them. The case study highlighted challenges of articulation and design of a post-critical approach, but also demonstrated how there continues to be pedagogical potential in these types of encounters to engage with an education that disrupts the persistent narratives and desires that constrain relationships (with self, others and knowledge) in ways that are epistemologically and ontologically limiting.
Challenges and Opportunities for Small Farms Marketing Dried Moringa Products in California’s San Joaquin Valley
Creators: name: Dahlquist-Willard, Ruth
name: Espinoza, Maria L. Ramos
name: Yang, Michael
name: Engelskirchen, Gwenael
name: Feenstra, Gail
name: Dahlquist-Willard, Ruth
name: Espinoza, Maria L. Ramos
name: Yang, Michael
name: Engelskirchen, Gwenael
name: Feenstra, Gail
Publisher: name: Unknown
Year: 2020
Subjects: subject: Crop Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Production Economics

description: Moringa is an emerging crop for California with an upward market trend due to its high nutritional value. It is grown on a small scale by Southeast Asian farmers in California’s San Joaquin Valley. While current sales have been entirely of fresh moringa, dried moringa products could provide additional income as well as the capacity for off-season sales of stored products. To expand economic opportunities for these farms, we researched best practices for creating value-added, dried moringa products for local, direct markets and wholesale markets. We also interviewed potential buyers to determine what marketing opportunities exist for both fresh and dried moringa in California. Our results indicate that dried moringa products can reach niche markets for local products in California if regulatory and certification requirements are addressed. Initially, our focus was working with individual farmers to expand fresh and processed moringa sales. However, aggregators or food businesses may be better suited to purchase fresh moringa from small-scale farms and complete the necessary certifications for processing it, especially if a locally sourced product could provide higher prices.
Evidence Feed Forward Hidden Markov Model: A New Type of Hidden Markov Model
Creators: name: DelRose, Michael
name: Wagner, Christian
name: Frederick, Philip
Publisher: name: arXiv
Year: 2011
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: I.2.10
subject: 60J20, 61E40, 65C50

description: The ability to predict the intentions of people based solely on their visual actions is a skill only performed by humans and animals. The intelligence of current computer algorithms has not reached this level of complexity, but there are several research efforts that are working towards it. With the number of classification algorithms available, it is hard to determine which algorithm works best for a particular situation. In classification of visual human intent data, Hidden Markov Models (HMM), and their variants, are leading candidates. The inability of HMMs to provide a probability in the observation to observation linkages is a big downfall in this classification technique. If a person is visually identifying an action of another person, they monitor patterns in the observations. By estimating the next observation, people have the ability to summarize the actions, and thus determine, with pretty good accuracy, the intention of the person performing the action. These visual cues and linkages are important in creating intelligent algorithms for determining human actions based on visual observations. The Evidence Feed Forward Hidden Markov Model is a newly developed algorithm which provides observation to observation linkages. The following research addresses the theory behind Evidence Feed Forward HMMs, provides mathematical proofs of their learning of these parameters to optimize the likelihood of observations with a Evidence Feed Forwards HMM, which is important in all computational intelligence algorithm, and gives comparative examples with standard HMMs in classification of both visual action data and measurement data; thus providing a strong base for Evidence Feed Forward HMMs in classification of many types of problems.
description: 19 pages, International Journal of Artificial Intelligence and Applications
Estimating the Economic Contributions of the Moscow Farmers Market
Creators: name: DePhelps, Colette
name: Peterson, Steven
name: DePhelps, Colette
name: Peterson, Steven
Publisher: name: Unknown
Year: 2020
Subjects: Agricultural and Food Policy
Community/Rural/Urban Development
Agricultural Finance

description: During the summer of 2018, a team of community members, led by University of Idaho Extension, performed a Rapid Market Assessment (RMA) of the Moscow Farmers Market, located in Moscow, Idaho. The RMA data was used by University of Idaho faculty to conduct an economic assessment of the Moscow Farmers Market using IMPact Analysis for PLANing (IMPLAN). The purpose of the study was to understand the economic footprint of the market, including estimating the market’s economic contribution to the City of Moscow’s investment in market operations and management and the economic contributions to the local economy in Latah County, Idaho. It is clear from this analysis that the Moscow Farmers Market is a significant asset to the City of Moscow and has significant positive direct and indirect contributions to the local economy. With the rise of COVID-19, it is important that the success of the Moscow Farmers Market be monitored, and that support be provided to market vendors and downtown shops to ensure their rebound post-pandemic.
Electronic properties of nanostructures defined in Ga[Al]As heterostructures by local oxidation
Creators: name: Heinzel, Thomas
name: Held, R.
name: Lüscher, S.
name: Ensslin, Klaus
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: Ga[Al]As; Scanning probe lithography; Quantum wires; Conductance uctuations
subject: 530 Physik

description: Tunable nanostructures can be patterned in Ga[Al]As heterostructures with an atomic force microscope (AFM). Oxidizing the GaAs cap layer locally by applying a voltage to the AFM tip leads to depletion of the electron gas underneath the oxide. Here, we describe this type of AFM lithography as a tool to fabricate tunable nanostructures and characterize the electronic properties of the resulting confinement. As an example for the versatility of this technique, we present conductance measurements on a quantum wire as a function of its position. Conductance fluctuations in real space with a characteristic period of 2 nm are observed and interpreted in terms of individual peaks in the potential landscape the wire hits as it moves through the host crystal.
Producer-to-Producer Business School: The Importance of Peer Networks in Ranch and Farm Business Planning
Creators: name: Macon, Dan
name: Ingram, Roger
name: Fake, Cindy
name: Macon, Dan
name: Ingram, Roger
name: Fake, Cindy
Publisher: name: Unknown
Year: 2020
Subjects: Agricultural Finance
Farm Management
Productivity Analysis

description: Economic viability is challenging for most small-scale agricultural producers, perhaps especially in the Sierra Nevada Foothills. Profitability, a key determination of long-term sustainability, is particularly difficult to achieve. Since 2008, we have been conducting a combination of structured business planning educational programs while supporting the creation of producer-to-producer networks to support further inquiry into production and business management topics, provide feedback on key decisions, and bring about accountability. Past participant surveys have demonstrated that these programs improve the likelihood of profitability compared with nonparticipant producers. We specifically describe two case studies, the Foothill Grazing Geeks and the Mandarin Growers Collaborative.
On the scaling rules for the anomaly-induced effective action of metric and electromagnetic field
Creators: name: Pelinson, Ana M.
name: Shapiro, Ilya L.
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
subject: 81T20, 81V17,

description: The anomaly-induced effective action is a useful tool for deriving the contributions coming from quantum effects of massless conformal fields. It is well-known that such corrections in the higher derivative vacuum sector of the gravitational action provide the same exponential inflation (Starobinsky model) as the cosmological constant term. At the same time, the presence of a classical electromagnetic field breaks down the exponential solution. In this paper we explore the role of the anomaly-induced term in the radiation sector and, furthermore, derive the ``equation of state'' and the scaling laws for all terms in the Einstein equations. As one could expect, the scaling law for the vacuum anomaly-induced effective action is the same as for the cosmological constant.
description: 12 pages, LaTeX, 4 figures
Initiating Farm-to-School Programs with Small, Socially Disadvantaged Farmers: A Case Study in Fresno
Creators: name: Mendoza, Carmen T.
name: Dahlquist-Willard, Ruth M.
name: Mendoza, Carmen T.
name: Dahlquist-Willard, Ruth M.
Publisher: name: Unknown
Year: 2020
Subjects: subject: Community/Rural/Urban Development
subject: Agricultural Finance
subject: Marketing
subject: FOS: Economics and business

description: Southeast Asian farmers in Fresno County are a socially disadvantaged group, which grows more than 14,000 tons of specialty crops per year. They typically sell produce at farm stands, Asian grocery stores and farmers markets throughout California. While previously they were unable to participate in farm-to-school programs in local school districts, technical assistance from a non-profit and a university extension program succeeded in a pilot program for institutional procurement at the Fresno Unified School District. Three farmers became vendors after barriers were addressed. We highlight the process and the outcomes of collaboration and advocacy.
Final Results of the GEp-III Experiment and the Status of the Proton Form Factors
Creators: name: Puckett, A. J. R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The recently published final results of experiment E04-108 in Jefferson Lab Hall C extend the recoil polarization measurements of the ratio of the proton electric and magnetic form factors to $Q^2 = 8.5$ GeV$^2$, an increase in $Q^2$ coverage of more than 50\%. A global fit of $G_E^p$ and $G_M^p$ to selected data for electron-proton elastic scattering cross sections and polarization observables is presented, illustrating the statistical impact of the new results.
description: To appear in Proceedings of the 4th Workshop on Exclusive Reactions at High Momentum Transfer
title: Analyse vorausgehender Bedingungen für die Unterstützung makrokognitiver Prozesse in Teams in der industriellen Instandhaltung
Creators: name: Grauel, Britta M.
name: Kluge, Annette
name: Adolph, Lars
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2013

description: Instandhaltungstätigkeiten umfassen Arbeiten bei laufenden Prozessen und mit engem

Maschinenkontakt. Zur Instandhaltung gehören häufig ungewohnte Arbeiten und Nicht-Routineaufgaben,

welche zudem unter außergewöhnlichen Bedingungen ausgeführt werden. Charakteristisch ist der Wechsel

von Aufgaben und Arbeitsumfeld sowie Zeitdruck. Insbesondere die Diagnose und Behebung von

Störungen ist eine schwierige und langwierige Aufgabe. Derartig komplexe und schwierige Aufgaben

werden häufig von Teams ausgeführt. Obwohl Teamarbeit viele Vorteile bietet, ergeben sich aus der

Interaktion von komplexen Systemen, Teamcharakteristiken (z. B. räumlich verteilt, heterogen, asynchron)

und Aufgaben (z. B. Störungsdiagnose) auch fehlerbegünstigende Faktoren. Neben mikrokognitiven

Prozessen der Informationsverarbeitung sind daher makrokognitive Prozesse (z. B. Wissensgenerierung im

Team) nötig, um die Tätigkeiten der Teammitglieder zu koordinieren und Informationen zu konvergieren.

Insbesondere örtlich verteilte Teams sind daher auf kollaborative Technologien angewiesen, welche z. B.

den Aufbau eines gemeinsamen Situationsbewusstseins fördern können. Negative Implikationen sind

jedoch möglich, wenn die Unterstützungstechnologie nicht auf Grundlage empirischer

Forschungsergebnisse auf die Teamaufgabe sowie die -prozesse zugeschnitten ist. Daher ist ein hoher Grad

an Detailwissen über das zu unterstützende Team notwendig.