cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Perspectives on the treatment of secondary flows in axial turbines
Creators: name: Rona, Aldo
name: Kadhim, Hakim Tarteeb Kadhim
Publisher: name: figshare
Year: 2022
Subjects: subject: 90101 Aerodynamics (excl. Hypersonic Aerodynamics)
subject: FOS: Mechanical engineering
subject: Mechanical Engineering
subject: 91305 Energy Generation, Conversion and Storage Engineering
subject: 90607 Power and Energy Systems Engineering (excl. Renewable Power)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A review is presented of the main end-wall treatments for the secondary flows of axial turbines. This encompasses the use of axisymmetric and non-axisymmetric contoured end-walls, the use of fences, and of air injection and blowing. Experimental and numerical results show promise in all these techniques. Interest seems to be drawing towards the use of non-axisymmetric contoured end-walls, due to their good compatibility with current turbine passage designs and their appealing stage pressure loss reduction at design conditions and off design. An insight is provided into the flow changes from non-axisymmetric end walls and on their effect on secondary flow losses.
Parallel Electric Field Spectrum of Solar Wind Turbulence
Creators: name: Mozer, F. S.
name: Chen, C. H. K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Space Physics (physics.space-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: By searching through more than 10 satellite-years of THEMIS and Cluster data, three reliable examples of parallel electric field turbulence in the undisturbed solar wind have been found. The perpendicular and parallel electric field spectra in these examples have similar shapes and amplitudes, even at large scales (frequencies below the ion gyroscale) where Alfvenic turbulence with no parallel electric field component is thought to dominate. The spectra of the parallel electric field fluctuations are power laws with exponents near -5/3 below the ion scales (~ 0.1 Hz), and with a flattening of the spectrum in the vicinity of this frequency. At small scales (above a few Hz), the spectra are steeper than -5/3 with values in the range of -2.1 to -2.8. These steeper slopes are consistent with expectations for kinetic Alfven turbulence, although their amplitude relative to the perpendicular fluctuations is larger than expected.
Resistance of High-Temperature Cuprate Superconductors
Creators: name: Tahir-Kheli, Jamil
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Cuprate superconductors have many different atoms per unit cell. A large fraction of cells (5-25%) must be modified ("doped") before the material superconducts. Thus it is not surprising that there is little consensus on the superconducting mechanism, despite almost 200,000 papers. Most astonishing is that for the simplest electrical property, the resistance, "despite sustained theoretical efforts over the past two decades, its origin and its relation to the superconducting mechanism remain a profound, unsolved mystery." Currently, model parameters used to fit normal state properties are experiment specific and vary arbitrarily from one doping to the other. Here, we provide a quantitative explanation for the temperature and doping dependence of the resistivity, Hall effect, and magnetoresistance in one self-consistent model by showing that cuprates are intrinsically inhomogeneous with a percolating metallic region and insulating regions. Using simple counting of dopant-induced plaquettes, we show that the superconducting pairing and resistivity are due to phonons.
description: Submitted to New Journal of Physics
Atomic age training camp: The historical archaeology of Camp Desert Rock
Creators: name: Edwards, Susan
Publisher: name: University of Nevada, Las Vegas
Year: 1996

description: Located in the southeast corner of the Nevada Test Site, Camp Desert Rock was established in 1951 when U.S. military leaders decided American ground troops needed physical and psychological training in the tactics of atomic warfare. For the next six years, Camp Desert Rock was home for the nearly 60,000 soldiers that participated in military exercises during atmospheric weapons testing. With the end of atmospheric testing the camp was partially dismantled and abandoned; The focus of this thesis was to identify and describe the material remains of Camp Desert Rock and to test the utility of Robert Schuyler's historic ethnographic approach for the investigation of Cold War related archaeological sites. A synthesis of three different yet complementary data sets (archaeological, historical, and anthropological) was employed to develop the appropriate context for interpretation of the camp and define its place in history.
Capitalist "communes" in the United States: The commodification of urban space and the rise of master-planned communities
Creators: name: Derossett, David Lee
Publisher: name: University of Nevada, Las Vegas
Year: 1996

description: The U.S. has experienced a dramatic proliferation of corporate master-planned communities, along with a related equally sharp increase in the numbers of people governed by private residential community associations (RCAs). Increasing by approximately 9,500 annually, RCA's are expected to grow from 130,000 in 1990 to approximately 225,000 by the year 2000. This trend is a manifestation of both the historical commodification of urban and community space and the gradual imposition of the corporate bureaucratic structure into community maintenance and governance. Intended to stimulate commodity need fulfillment and ensure the continued dominance of patriarchal bourgeois ideology, this new community form has come to dominate alternative community form. This examination places these trends in critical perspective, specifically addressing agency, conflict, resistance, and the historical and current struggles to create cooperatively self-determined alternative community space that fundamentally challenges dominant ideology.
Runtime Verification Based on Executable Models: On-the-Fly Matching of Timed Traces
Creators: name: Chupilko, Mikhail
name: Kamkin, Alexander
Publisher: name: arXiv
Year: 2013
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: D.2.4; D.2.5

description: Runtime verification is checking whether a system execution satisfies or violates a given correctness property. A procedure that automatically, and typically on the fly, verifies conformance of the system's behavior to the specified property is called a monitor. Nowadays, a variety of formalisms are used to express properties on observed behavior of computer systems, and a lot of methods have been proposed to construct monitors. However, it is a frequent situation when advanced formalisms and methods are not needed, because an executable model of the system is available. The original purpose and structure of the model are out of importance; rather what is required is that the system and its model have similar sets of interfaces. In this case, monitoring is carried out as follows. Two "black boxes", the system and its reference model, are executed in parallel and stimulated with the same input sequences; the monitor dynamically captures their output traces and tries to match them. The main problem is that a model is usually more abstract than the real system, both in terms of functionality and timing. Therefore, trace-to-trace matching is not straightforward and allows the system to produce events in different order or even miss some of them. The paper studies on-the-fly conformance relations for timed systems (i.e., systems whose inputs and outputs are distributed along the time axis). It also suggests a practice-oriented methodology for creating and configuring monitors for timed systems based on executable models. The methodology has been successfully applied to a number of industrial projects of simulation-based hardware verification.
description: In Proceedings MBT 2013, arXiv:1303.0379
Invisible decays of the lightest Higgs boson in supersymmetric models
Creators: name: Ananthanarayan, B.
name: Lahiri, Jayita
name: Pandita, P. N.
name: Patra, Monalisa
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider supersymmetric models in which the lightest Higgs scalar can decay invisibly consistent with the constraints on the $126$~GeV state discovered at the CERN LHC. We consider the invisible decay in the minimal supersymmetric standard model~(MSSM), as well its extension containing an additional chiral singlet superfield, the so-called next-to-minimal or nonminimal supersymmetric standard model~(NMSSM).We consider the case of MSSM with both universal as well as nonuniversal gaugino masses at the grand unified scale, and find that only an $E_6$ grand unified model with unnaturally large representation can give rise to sufficiently light neutralinos which can possibly lead to the invisible decay $h^0 \rightarrow \tilde χ_1^0 \tilde χ_1^0$. Following this, we consider the case of NMSSM in detail, where also we find that it is not possible to have the invisible decay of the lightest Higgs scalar with universal gaugino masses at the grand unified scale. We delineate the regions of the NMSSM parameter space where it is possible to have the lightest Higgs boson to have a mass of about $126$ GeV, and then concentrate on the region where this Higgs can decay into light neutralinos, with the soft gaugino masses $M_1$ and $M_2$ as two independent parameters, unconstrained by grand unification. We also consider, simultaneously, the other important invisible Higgs decay channel in the NMSSM, namely the decay into the lightest CP odd scalars, $h_1 \to a_1 a_1$, which is studied in detail. With the invisible Higgs branching ratio being constrained by the present LHC results, we find that $μ_{eff} < 170$~GeV and $M_1 < 80$~GeV is disfavored in NMSSM for fixed values of the other input parameters. The dependence of our results on the parameters of NMSSM is discussed in detail.
description: 20 pages, 14 figures, to appear in Physical Review D
A two-atom electron pump
Creators: name: Roche, B.
name: Riwar, R. -P.
name: Voisin, B.
name: Dupont-Ferrier, E.
name: Wacquez, R.
name: Vinet, M.
name: Sanquer, M.
name: Splettstoesser, J.
name: Jehl, X.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The fabrication of single atom transistors paved the way for electronics based on single dopants. Recently the spectrum of a single dopant was measured electrically by coupling two such devices. The next step towards promising functionalities for future nanoelectronics consists in manipulating a single electron over two dopants. Here we demonstrate electron pumping through two phosphorus donors in series implanted in a silicon nanowire. While quantized pumping is achieved in the low frequency adiabatic regime, we observe remarkable features at higher frequency when the charge transfer is limited by the different tunneling rates. The transitions between quantum states are modeled involving a Landau-Zener transition, allowing to reproduce in detail the characteristic signatures observed in the non-adiabatic regime.
The Effect of Irradiation on the Jeans Mass in Fragmenting Self-Gravitating Protostellar Discs
Creators: name: Forgan, Duncan
name: Rice, Ken
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: When a self-gravitating disc is subject to irradiation, its propensity to fragmentation will be affected. The strength of self-gravitating disc stresses is expected to dictate disc fragmentation: as the strength of these torques typically decrease with increasing sound speed, it is reasonable to assume, to first-order, that disc fragmentation is suppressed when compared to the non-irradiated case, although previous work has shown that the details are complicated by the source of the irradiation. We expand on previous analysis of the Jeans mass inside spiral structures in self-gravitating discs, incorporating the effects of stellar irradiation and background irradiation. If irradiation is present, fragmentation is suppressed for marginally unstable discs at low accretion rates (compared to the no-irradiation case), but these lower accretion rates correspond to higher mass discs. Fragmentation can still occur for high accretion rates, but is consequently suppressed at lower disc surface densities, and the subsequent Jeans mass is boosted. These results further bolster the consensus that, without subsequent fragment disruption or mass loss, the gravitational instability is more likely to form brown dwarfs and low-mass stars than gas giant planets.
description: 8 pages, 14 figures, accepted for publication in MNRAS
Statistical comparison of quark mass matrices\\ in the physical basis
Creators: name: Chaturvedi, S.
name: Gupta, V.
name: Sánchez-Colón, G.
name: Rajpoot, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using the four best measured moduli of the flavor mixing matrix ($|V_{\rm ud}|$, $|V_{\rm us}|$, $|V_{\rm cd}|$, $|V_{\rm cs}|$), the Jarlskog invariant $J(V)$, and the quark masses at $M_Z$ energy scale as experimental constraints, a statistical comparison of three different types of quark mass matrices in the physical basis is performed. The mass matrices in question are the Chaturvedi-Gupta-Sánchez-Colón (CGS), the Fritzsch and the Gupta-Rajpoot types. With nine parameters the best fits are obtained using a Gupta-Rajpoot type matrix while with seven parameters the best fits are obtained using the CGS type matrix. The stability of our analysis with respect to evolution of the quark masses is also presented.
On $\mathscr{H}$-complete topological semilattices
Creators: name: Bardyla, S.
name: Gutik, O.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 22A26, 06B30, 06F30, 54H12, 54C10

description: In the paper we describe the structure of $\mathscr{AH}$-completions and $\mathscr{H}$-completions of the discrete semilattices $(\mathbb{N},\min)$ and $(\mathbb{N},\max)$. We give an example of an $\mathscr{H}$-complete topological semilattice which is not $\mathscr{AH}$-complete. Also we construct an $\mathscr{H}$-complete topological semilattice of cardinality $λ$ which has $2^λ$ many open-and-closed continuous homomorphic images which are not $\mathscr{H}$-complete topological semilattices. The constructed examples give a negative answer to Question 17 from the paper J. W. Stepp, {\it Algebraic maximal semilattices}. Pacific J. Math. {\bf 58}:1 (1975), 243-248.
Top-Down and Bottom-Up Approach for Model-Based Testing of Product Lines
Creators: name: Weißleder, Stephan
name: Lackner, Hartmut
Publisher: name: arXiv
Year: 2013
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: D.2.4; D.2.5

description: Systems tend to become more and more complex. This has a direct impact on system engineering processes. Two of the most important phases in these processes are requirements engineering and quality assurance. Two significant complexity drivers located in these phases are the growing number of product variants that have to be integrated into the requirements engineering and the ever growing effort for manual test design. There are modeling techniques to deal with both complexity drivers like, e.g., feature modeling and model-based test design. Their combination, however, has been seldom the focus of investigation. In this paper, we present two approaches to combine feature modeling and model-based testing as an efficient quality assurance technique for product lines. We present the corresponding difficulties and approaches to overcome them. All explanations are supported by an example of an online shop product line.
description: In Proceedings MBT 2013, arXiv:1303.0379
Climate Optimized Flight Routes – The Path from Research to Operations
Creators: name: Leemüller, Ralph
Publisher: name: Zenodo
Year: 2022
Subjects: aviation
airplanes
climate
warming
radiative forcing
emissions
CO2
nonCO2
NOx
contrails
cirrus
contrail-cirrus
air traffic
air traffic control
ATC
GWP100
GWP50
ATR50
altitude
flight level
FL
ISSR
ice
supersaturated
ETS
D-KULT
DFS
DWD
Airbus
DHL
DLR
BMWK
routing
HFE
footprint
forecast
Schmidt-Appleman
aerolectures
aerolectures2022

description: Studies in research often promise a fast system implementation and usage in operation. But especially in safety critical areas like air navigation services it can be recognized that it takes quite a long time from proclaimed "ready for use" at research level until actual operational use. Why this difference? Often, necessary aspects like safety assessment, certification, and training procedures for operators cannot be analyzed by researcher. The validation under operational circumstances may lead to additional questions. The presentation demonstrates several challenges in the actual discussion about avoidance of persistent contrails. The German project D-KULT (Demonstrator klima- und umwelt- freundlicher Lufttransport, June 2022 to May 2025) works on several solutions and its ideas are presented during the lecture.
description: Hamburg Aerospace Lecture Series --- Collection of Presentations --- http://www.AeroLectures.de
Systematic investigation of E1 strength for the isotopes from Z = 28 to 50
Creators: name: Ebata, Shuichiro
name: Nakatsukasa, Takashi
name: Inakura, Tsunenori
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We carry out a systematic study of electric dipole mode (E1) for neutron-rich isotopes from nickel (Z=28) to tin (Z=50) using a time-dependent mean-field theory. Our time-dependent scheme is the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory which can self-consistently describe nuclear dynamics with pairing correlation. We focus our discussion on the pygmy dipole resonance (PDR) and E1 polarizability. The correlation between neutron-skin thickness and PDR strongly depends on the neutron number, but the correlation between the skin thickness and E1 polarizability is much more stable.
description: 4 page, 2 figures, ENSFN2012 conference proceedings
Enhancing the Critical Current of a Superconducting Film in a Wide Range of Magnetic Fields with a Conformal Array of Nanoscale Holes
Creators: name: Wang, Yong-Lei
name: Latimer, M. L.
name: Xiao, Zhi-Li
name: Divan, R.
name: Ocola, L. E.
name: Crabtree, G. W.
name: Kwok, Wai-Kwong
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The maximum current (critical current) a type-II superconductor can transmit without energy loss is limited by the motion of the quantized magnetic flux penetrating into a superconductor. Introducing nanoscale holes into a superconducting film has been long pursued as a promising way to increase the critical current. So far the critical current enhancement was found to be mostly limited to low magnetic fields. Here we experimentally investigate the critical currents of superconducting films with a conformal array of nanoscale holes that have non-uniform density while preserving the local ordering. We find that the conformal array of nanoscle holes provides a more significant critical current enhancement at high magnetic fields. The better performance can be attributed to its arching effect that not only gives rise to the gradient in hole-density for pinning vortices with a wide range of densities but also prevent vortex channeling occurring in samples with a regular lattice of holes.
description: 5 pages, 3 figures
2 Impact-of-locus-of-control-and-organizational-commitment-on-employee-performance-study-of-service-sector-pakistan.pdf
Creators: name: Khushk, Amir
Publisher: name: figshare
Year: 2022
Subjects: subject: 150305 Human Resources Management
subject: FOS: Economics and business
subject: Organizational Behavioral Psychology

description: Area of this research focuses on the impact ofinternal and external locus of control (LOC) andorganizational commitment on employee performance withfocus on service industry of Pakistan i:e Careem(transportation network company) and to identify correlation;Pearson correlation was used which highlights the affirmativeor favorable correlation between LOC and organizationalcommitment on employee performance who are employed inCareem Pakistan. To understand the influence of LOC andorganizational commitment over employee performanceinferential study was conducted in the form of survey.
 (8) (PDF) Impact of Locus of Control (LOC) and Organizational Commitment on Employee Performance-Study of Service Sector, Pakistan. Available from: https://www.researchgate.net/publication/332835100_Impact_of_Locus_of_Control_LOC_and_Organizational_Commitment_on_Employee_Performance-Study_of_Service_Sector_Pakistan [accessed Oct 19 2022].
Persistence and First-Passage Properties in Non-equilibrium Systems
Creators: name: Bray, Alan J.
name: Majumdar, Satya N.
name: Schehr, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In this review we discuss the persistence and the related first-passage properties in extended many-body nonequilibrium systems. Starting with simple systems with one or few degrees of freedom, such as random walk and random acceleration problems, we progressively discuss the persistence properties in systems with many degrees of freedom. These systems include spins models undergoing phase ordering dynamics, diffusion equation, fluctuating interfaces etc. Persistence properties are nontrivial in these systems as the effective underlying stochastic process is non-Markovian. Several exact and approximate methods have been developed to compute the persistence of such non-Markov processes over the last two decades, as reviewed in this article. We also discuss various generalisations of the local site persistence probability. Persistence in systems with quenched disorder is discussed briefly. Although the main emphasis of this review is on the theoretical developments on persistence, we briefly touch upon various experimental systems as well.
description: Review article submitted to Advances in Physics: 149 pages, 21 Figures
A rhetorical situation: Contemporary arguments on the legalization of gambling in America
Creators: name: Lewellyn Davidson, Jan
Publisher: name: University of Nevada, Las Vegas
Year: 1996

description: Lloyd Bitzer's (1992) definition of a rhetorical situation is applied to a historical review of the rhetoric surrounding the legalization of gambling in America. The Indian Gaming Regulatory Act of 1988 invites rhetoric from tribes, the gaming industry, elected government officials, anti-gambling coalitions, and states. Consistent rhetorical participation by these parties gives significance to gambling in America. A review of the rhetoric on legalized gaming illustrates the vacillating public opinion of legalized gambling in America. This study delineates Indians' poor living condition on reservations as the existing situation initiating rhetorical discourse. While all parties continue to debate their respective positions, Nevadans' concerns lie with deficient regulatory controls on Indian gaming operations. Absent effective gaming policies and regulations, it may be anticipated that organized crime will infiltrate Indian gambling. This infiltration may lead to federal oversight of all legalized gambling in the United States, whether on or off the reservations.
Testing the non-linear flux ansatz for maximal supergravity
Creators: name: Godazgar, Hadi
name: Godazgar, Mahdi
name: Nicolai, Hermann
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We put to test the recently proposed non-linear flux ansatz for maximal supergravity in eleven dimensions, which gives the seven-dimensional flux in terms of the scalars and pseudoscalars of maximal N=8 supergravity, by considering a number of non-trivial solutions of gauged supergravity for which the higher dimensional solutions are known. These include the G$_2$ and SU(4)$^-$ invariant stationary points. The examples considered constitute a very non-trivial check of the ansatz, which it passes with remarkable success.
description: 23 pages
Use of image manipulation to elicit user preferences in mountain resorts
Creators: name: Cechavicius, Kastytis
Publisher: name: University of Nevada, Las Vegas
Year: 1996

description: Mountain Resorts: User Expectations of Preferred Size and Settings related to the visual appeal of mountain resort imagery for two diverse age groups were investigated. As such, the study was designed to provide a basic analysis of the market user preferences and aesthetic values of the two age groups for mountain resorts. The study highlighted preferences for the size of a resort facility and its environmental setting. A computer manipulation of mountain resort images was used to derive visual preferences of the size of mountain resorts. A further objective of the thesis was to examine the extent of variations of visual preferences for images of mountain resorts between the two age groups based on the technique used for the investigation.
An economic approach to the study of polygamy: A case study of Mormon polygyny
Creators: name: Diaz, Joseph Dean
Publisher: name: University of Nevada, Las Vegas
Year: 1996

description: This is a study of polygamy using economic theory and economic models. The focus of this research is an analysis of the occurrence of polygyny in the early Mormon church, and its effects on the members of the state of Utah, both Mormon and non-Mormon. This study is unique in that its subject, Mormon polygyny, was socially acceptable in Utah, but illegal, and often prosecuted, under Federal law. This combination had multiple negative effects on all aspects of the lives of Utah Mormons, however, the practice continued for approximately 60 years. The ways in which it occurred as well as the reasons for its eventual decline will be analyzed and discussed.
Hopelessness and spiritual well-being in persons with Hiv infection
Creators: name: Gulliver, Kevin Mark
Publisher: name: University of Nevada, Las Vegas
Year: 1996

description: The purpose of this study was to examine the relationship between hopelessness and spiritual well-being in a population of persons diagnosed to be Human Immunodeficiency Virus (HIV) positive. Demographic variables were examined to determine their potential relationship to hopelessness and spiritual well-being. The Neuman Systems Model was used as the conceptual framework for the research. The sample was similar in gender to the national population of persons diagnosed with Acquired Immune Deficiency Syndrome (AIDS). A sample of 67 was obtained from a community multi-service agency which provides services for HIV positive clients. Significant negative correlations were found between levels of hopelessness and spiritual well-being. Both the religious and existential well-being subscales of the spiritual well-being scale were found to have significant negative correlations with hopelessness, however existential well-being had a higher level of significance. Age, religious affiliation, having a marriage or significant relationship that is generally positive, and education were found to have significant correlations with one or all of the variables of hopelessness, spiritual well-being, existential well-being, and religious well-being.
Spin relaxometry of single nitrogen-vacancy defects in diamond nanocrystals for magnetic noise sensing
Creators: name: Tetienne, J. -P.
name: Hingant, T.
name: Rondin, L.
name: Cavailles, A.
name: Mayer, L.
name: Dantelle, G.
name: Gacoin, T.
name: Wrachtrup, J.
name: Roch, J. -F.
name: Jacques, V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report an experimental study of the longitudinal relaxation time ($T_1$) of the electron spin associated with single nitrogen-vacancy (NV) defects hosted in nanodiamonds (ND). We first show that $T_1$ decreases over three orders of magnitude when the ND size is reduced from 100 to 10 nm owing to the interaction of the NV electron spin with a bath of paramagnetic centers lying on the ND surface. We next tune the magnetic environment by decorating the ND surface with Gd$^{3+}$ ions and observe an efficient $T_{1}$-quenching, which demonstrates magnetic noise sensing with a single electron spin. We estimate a sensitivity down to $\approx 14$ electron spins detected within 10 s, using a single NV defect hosted in a 10-nm-size ND. These results pave the way towards $T_1$-based nanoscale imaging of the spin density in biological samples.
description: Main text with 4 figures together with supplemental information
Spreading of soap bubbles on dry and wet surfaces
Creators: name: Pfeiffer, Patricia
name: Ohl, Claus-Dieter
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2020
Subjects: subject: Soap bubbles
subject: Wet surfaces
subject: Dry surfaces
subject: 530

description: The spreading of soap bubbles after forming contact with a substrate is experimentally studied. We find for dry glass substrate that the rim of the spreading soap bubble follows the well known scaling law for inertia dominated spreading r [rund] t1/2 [Eggers, J., Lister, J., and Stone, H., J. Fluid Mech. 401, 293–310 (1999)]. Varying the viscosity of the soap solutions and the coating of the glass does not affect this spreading behavior qualitatively. Yet, on a wetted surface, the rim obtains a constant radial velocity. Here, the rim splits into two and this new rim trails the main rim. Interestingly, the central film enclosed by the two rims develops radially oriented wrinkles.
Social comparison impacts stimulus evaluation in a competitive social learning task
Creators: name: Burnside, Rebecca
name: Ullsperger, Markus
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2020
Subjects: subject: Competitive social learning
subject: Social comparison
subject: Stimulus
subject: 150.72

description: When we perform an action, the outcome that follows it can change the value we place on that behaviour, making it more or less likely to be repeated in the future. However, the values that we learn are not objective: we interpret the outcomes that we receive for ourselves relative to those that share our environment, i.e. we engage in social comparison. The temporal dynamics of physiological responses to stimulus valuation in social learning tasks are poorly understood, particularly in human participants. Therefore, we recorded stimulus-locked event-related potentials with 64-channel EEG to examine stimulus valuation, following the design of a study previously used in macaques. Pairs of participants performed a social learning task in which they received outcomes sequentially for a presented stimulus (partner first) by pressing a button in response to a cue. There were two conditions: one in which stimulus values varied for the participant but output a constant rate of reward for the partner (self-variable blocks), and another condition in which this payout was reversed (other-variable blocks). We then measured participants’ self-reported competitiveness. Approximately 200 ms post-stimulus, an ERP related to stimulus evaluation and attentional processing appeared to encode own stimulus value in self-variable blocks. In other-variable blocks the same pattern of activity was reversed, even though the value of the stimulus for the participant did not depend on the stimulus presented. Outcome-locked analyses further showed that attention dedicated to the partner’s outcome was greater in more competitive participants. We conclude that subjective stimulus value can be reflected in early stimulus-locked ERP responses and that competitive participants may be more invested in their own performance relative to the other player, hence their increased interest in the outcome of their partner.
Colouring Isonemal Fabrics with more than two Colours by Thick Striping
Creators: name: Thomas, R. S. D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: primary 52C20, secondary 05B45, 51M20

description: Perfect colouring of isonemal fabrics by thin and thick striping of warp and weft with more than two colours is introduced. Conditions that prevent perfect colouring by striping are derived, and it is shown that avoiding them is sufficient to allow it. Examples of thick striping in all possible species are given.
description: 23 Figures
Cooperative dynamics of microtubule ensembles: Polymerization forces and rescue-induced oscillations
Creators: name: Zelinski, Björn
name: Kierfeld, Jan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences

description: We investigate the cooperative dynamics of an ensemble of N microtubules growing against an elastic barrier. Microtubules undergo so-called catastrophes, which are abrupt stochastic transitions from a growing to a shrinking state, and rescues, which are transitions back to the growing state. Microtubules can exert pushing or polymerization forces on an obstacle, such as an elastic barrier if the growing end is in contact with the obstacle. We use dynamical mean-field theory and stochastic simulations to analyze a model where each microtubule undergoes catastrophes and rescues and where microtubules interact by force sharing. For zero rescue rate, cooperative growth terminates in a collective catastrophe. The maximal polymerization force before catastrophes grows linearly with N for small N or a stiff elastic barrier, in agreement with available experimental results, whereas it crosses over to a logarithmic dependence for larger N or a soft elastic barrier. For a nonzero rescue rate and a soft elastic barrier, the dynamics becomes oscillatory with both collective catastrophe and rescue events, which are part of a robust limit cycle. Both the average and maximal polymerization forces then grow linearly with N, and we investigate their dependence on tubulin on-rates and rescue rates, which can be involved in cellular regulation mechanisms. We further investigate the robustness of the collective catastrophe and rescue oscillations with respect to different catastrophe models.
Velocity-Space Proton Diffusion in the Solar Wind Turbulence
Creators: name: Voitenko, Yuriy
name: Pierrard, Viviane
Publisher: name: arXiv
Year: 2013
Subjects: subject: Space Physics (physics.space-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We study a velocity-space quasilinear diffusion of the solar wind protons driven by oblique Alfven turbulence at proton kinetic scales. Turbulent fluctuations at these scales possess properties of kinetic Alfven waves (KAWs) that are efficient in Cherenkov resonant interactions. The proton diffusion proceeds via Cherenkov kicks and forms a quasilinear plateau - nonthermal proton tail in the velocity distribution function (VDF). The tails extend in velocity space along the mean magnetic field from 1 to (1.5-3) VA, depending on the spectral break position, turbulence amplitude at the spectral break, and spectral slope after the break. The most favorable conditions for the tail generation occur in the regions where the proton thermal and Alfven velocities are about the same, VTp/VA = 1. The estimated formation times are within 1-2 h for typical tails at 1 AU, which is much shorter than the solar wind expansion time. Our results suggest that the nonthermal proton tails, observed in-situ at all heliocentric distances beyond 0.3 AU, are formed in the solar wind locally by the KAW turbulence. We also suggest that the bump-on-tail features - proton beams, often seen in the proton VDFs, can be formed at a later evolution stage of the nonthermal tails by the time-of-flight effects.
Conceptual approximations for understanding the dimensions of sustainable marketing
Creators: name: Xicota, E.
name: Vilchez, C.
Publisher: name: Zenodo
Year: 2022
Subjects: sustainable marketing
sustainability
marketing

description: Purpose of the study To explore “sustainable marketing” definitions going through all related concepts. The goal is to propose a unified concept that clarify marketing departments contribution to achieve SDGs. Hypothesis  There is no unified understanding of the sustainable development concept (within academia) that is aligned with the SDGs.
Improved Accuracy of PSO and DE using Normalization: an Application to Stock Price Prediction
Creators: name: Kaur, Savinderjit
name: Mangat, Veenu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Data Mining is being actively applied to stock market since 1980s. It has been used to predict stock prices, stock indexes, for portfolio management, trend detection and for developing recommender systems. The various algorithms which have been used for the same include ANN, SVM, ARIMA, GARCH etc. Different hybrid models have been developed by combining these algorithms with other algorithms like roughest, fuzzy logic, GA, PSO, DE, ACO etc. to improve the efficiency. This paper proposes DE-SVM model (Differential EvolutionSupport vector Machine) for stock price prediction. DE has been used to select best free parameters combination for SVM to improve results. The paper also compares the results of prediction with the outputs of SVM alone and PSO-SVM model (Particle Swarm Optimization). The effect of normalization of data on the accuracy of prediction has also been studied.
Threshold Digraphs
Creators: name: Cloteaux, Brian
name: LaMar, M. Drew
name: Moseman, Elizabeth
name: Shook, James
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05C20

description: A digraph whose degree sequence has a unique vertex labeled realization is called threshold. In this paper we present several characterizations of threshold digraphs and their degree sequences, and show these characterizations to be equivalent. One of the characterizations is new, and allows for a shorter proof of the equivalence of the two known characterizations as well as proving the final characterization which appears without proof in the literature. Using this result, we obtain a new, short proof of the Fulkerson-Chen theorem on degree sequences of general digraphs.
Genus expansion of HOMFLY polynomials
Creators: name: Mironov, A.
name: Morozov, A.
name: Sleptsov, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Geometric Topology (math.GT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In the planar limit of the 't Hooft expansion, the Wilson-loop average in 3d Chern-Simons theory (i.e. the HOMFLY polynomial) depends in a very simple way on representation (the Young diagram), so that the (knot-dependent) Ooguri-Vafa partition function becomes a trivial KP tau-function. We study higher genus corrections to this formula in the form of expansion in powers of z = q-q^{-1}. Expansion coefficients are expressed through the eigenvalues of the cut-and-join operators, i.e. symmetric group characters. Moreover, the z-expansion is naturally exponentiated. Representation through cut-and-join operators makes contact with Hurwitz theory and its sophisticated integrability properties. Our formulas describe the shape of genus expansion for the HOMFLY polynomials, which for their matrix model counterparts is usually controlled by Virasoro like constraints and AMM/EO topological recursion. The genus expansion differs from the better studied weak coupling expansion at finite number of colors N, which is described in terms of the Vassiliev invariants and Kontsevich integral.
description: 34 pages
MICZ-Kepler = dynamics on the cone over the rotation group
Creators: name: Montgomery, Richard
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 37NOF, 70FO5

description: We show that the n-dimensional MICZ-Kepler system arises from symplectic reduction of a simple mechanical system on the cone over the rotation group SO(n). As a corollary we derive an elementary formula for its general solution. The punch-line of our computation is that the additional MICZ-Kepler $|ϕ|^2/r^2$ type potential term is the rotational part of the cone's kinetic energy.
description: no figures
Intragroup and Galaxy-Linked Diffuse X-ray Emission in Hickson Compact Groups
Creators: name: Desjardins, Tyler D.
name: Gallagher, Sarah C.
name: Tzanavaris, Panayiotis
name: Mulchaey, John S.
name: Brandt, William N.
name: Charlton, Jane C.
name: Garmire, Gordon P.
name: Gronwall, Caryl
name: Hornschemeier, Ann E.
name: Johnson, Kelsey E.
name: Konstantopoulos, Iraklis S.
name: Zabludoff, Ann I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Isolated compact groups of galaxies (CGs) present a range of dynamical states, group velocity dispersions, and galaxy morphologies with which to study galaxy evolution, particularly the properties of gas both within the galaxies and in the intragroup medium. As part of a large, multiwavelength examination of CGs, we present an archival study of diffuse X-ray emission in a subset of nine Hickson compact groups observed with the Chandra X-ray Observatory. We find that seven of the groups in our sample exhibit detectable diffuse emission. However, unlike large-scale emission in galaxy clusters, the diffuse features in the majority of the detected groups are linked to the individual galaxies, in the form of both plumes and halos likely as a result of star formation or AGN activity, as well as in emission from tidal features. Unlike previous studies from earlier X-ray missions, HCGs 31, 42, 59, and 92 are found to be consistent with the Lx-T relationship from clusters within the errors, while HCGs 16 and 31 are consistent with the cluster Lx-sigma relation, though this is likely coincidental given that the hot gas in these two systems is largely due to star formation. We find that Lx increases with decreasing group HI to dynamical-mass ratio with tentative evidence for a dependance in X-ray luminosity on HI morphology whereby systems with intragroup HI indicative of strong interactions are considerably more X-ray luminous than passively evolving groups. We also find a gap in the Lx of groups as a function of the total group specific star formation rate. Our findings suggest that the hot gas in these groups is not in hydrostatic equilibrium and these systems are not low-mass analogs of rich groups or clusters, with the possible exception of HCG 62.
description: 41 pages, 7 figures, 4 tables, accepted for publication in ApJ
GATERS at Posidonia International Shipping Exhibition 2022
Creators: name: Drikos, Leonidas
name: Niotis, Athanasios
Publisher: name: figshare
Year: 2022
Subjects: Marine engineering
Naval architecture

description: Posidonia 2022, the world’s most prestigious biennial shipping event, on Monday 6-10 June, welcomed the global maritime community back to Athens, following the pandemic-induced cancellation of the 2020 event. The GATERS project is on the display by the project Greek partner, Glafcos Marine Ltd (GME), in their exhibition booth with a characteristic massive 3D prints of the Gate Rudder System (GRS) representing the scaled model of the world’s first GRS retrofit for the project target vessel MV ERGE. The ceremony at the Athens Metropolitan Expo marked the resumption of the global maritime calendar’s most anticipated event, which is also the largest in size during its 54 year-long history, having grown by 7% in net exhibitor space compared to the 2018 event. A total of 1,948 exhibitors from 88 countries and 24 National Pavilions from Europe, North America and Asia will display their products and showcase their maritime credentials during the event which is expected to be attended by more than 18,000 international and Greek visitors. Amongst them thousands of delegates who have arrived to Athens to attend the 68 conferences, seminars and workshops, scheduled to take place at the Metropolitan Expo Centre Venue over the next four days.
Fast transport, atom sample splitting, and single-atom qubit supply in two-dimensional arrays of optical microtraps
Creators: name: Schlosser, Malte
name: Kruse, Jens
name: Gierl, Christian
name: Teichmann, Stephan
name: Tichelmann, Sascha
name: Birkl, Gerhard
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Two-dimensional arrays of optical micro-traps created by microoptical elements present a versatile and scalable architecture for neutral atom quantum information processing, quantum simulation, and the manipulation of ultra-cold quantum gases. In this article, we demonstrate advanced capabilities of this approach by introducing novel techniques and functionalities as well as the combined operation of previously separately implemented functions. We introduce piezo-actuator based transport of atom ensembles over distances of more than one trap separation, examine the capabilities of rapid atom transport provided by acousto-optical beam steering, and analyze the adiabaticity limit for atom transport in these configurations. We implement a spatial light modulator with 8-bit transmission control for the per-site adjustment of the trap depth and the number of atoms loaded. We combine single-site addressing, trap depth control, and atom transport in one configuration for demonstrating the splitting of atom ensembles with variable ratio at predefined register sites. Finally, we use controlled sub-poissonian preparation of single trapped atoms from such an ensemble to show that our approach allows for the implementation of a continuous supply of single-atom qubits with high fidelity. These novel implementations and their combined operation significantly extend available techniques for the dynamical and reconfigurable manipulation of ultracold atoms in dipole traps.
title: Titelblatt - Inhalt
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2015

description: kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 43, Nr. 1 (2015): kritische berichte, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Inhalt / Aktuelle Ausstellungen / Impressum
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 3 (2004): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004