cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A new graph perspective on max-min fairness in Gaussian parallel channels
Creators: name: Wiczanowski, Marcin
name: Boche, Holger
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: Discrete Mathematics (cs.DM)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In this work we are concerned with the problem of achieving max-min fairness in Gaussian parallel channels with respect to a general performance function, including channel capacity or decoding reliability as special cases. As our central results, we characterize the laws which determine the value of the achievable max-min fair performance as a function of channel sharing policy and power allocation (to channels and users). In particular, we show that the max-min fair performance behaves as a specialized version of the Lovasz function, or Delsarte bound, of a certain graph induced by channel sharing combinatorics. We also prove that, in addition to such graph, merely a certain 2-norm distance dependent on the allowable power allocations and used performance functions, is sufficient for the characterization of max-min fair performance up to some candidate interval. Our results show also a specific role played by odd cycles in the graph induced by the channel sharing policy and we present an interesting relation between max-min fairness in parallel channels and optimal throughput in an associated interference channel.
description: 41 pages, 8 figures. submitted to IEEE Transactions on Information Theory on August the 6th, 2008
title: Nanostructured Nickel Catalysts for Sustainable (De-)Hydrogenation Reactions
Creators: name: Klarner, Mara
Publisher: name: University of Bayreuth
Year: 2021
Subjects: subject: Heterogeneous Catalysis
subject: Photocatalysis
subject: Nickel
subject: Chemoselective Hydrogenation Reactions
subject: Dehydrogenation Reactions
subject: Metal-Organic Framework
subject: 540

description: This thesis mainly focuses on the earth-abundant metal nickel as a nanoparticulate (co-)catalyst in thermal hydrogenation reactions and photocatalytic dehydrogenation reactions. The first part focuses on the design of nanostructured nickel hydrogenation catalysts based on commercial porous support materials. The second part deals with multicomponent photocatalysts supported on the metal-organic framework MIL-101.
Optimal Node Density for Two-Dimensional Sensor Arrays
Creators: name: Sung, Youngchul
name: Poor, H. Vincent
name: Yu, Heejung
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences
subject: E.4; H.1.1

description: The problem of optimal node density for ad hoc sensor networks deployed for making inferences about two dimensional correlated random fields is considered. Using a symmetric first order conditional autoregressive Gauss-Markov random field model, large deviations results are used to characterize the asymptotic per-node information gained from the array. This result then allows an analysis of the node density that maximizes the information under an energy constraint, yielding insights into the trade-offs among the information, density and energy.
description: Proceedings of the Fifth IEEE Sensor Array and Multichannel Signal Processing Workshop, Darmstadt, Germany, July 21 - 23, 2008
Regulated star formation in forming disk galaxies under ultraviolet radiation background
Creators: name: Susa, Hajime
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We perform radiation hydrodynamics simulations on the evolution of galactic gas disks irradiated by ultraviolet radiation background. We find gas disks with N_H > 10^21 cm^-2 exposed to ultraviolet radiation at a level of I_21=1 can be self-shielded from photoheating, whereas the disk with N_H < 10^21 cm^-2 cannot. We also find that the unshielded disks keep smooth density distribution without any sign of fragmentation, while the self-shielded disks easily fragment into small pieces by self-gravity, possibly followed by star formation. The suppression of star formation in unshielded disks is different from photoevaporation effect, since the assumed dark halo potential is deep enough to keep the photoheated gas. Presence of such critical threshold column density would be one of the reason for the so-called down-sizing feature of present-day galaxies.
description: 12pages, 10figures, ApJ accepted
Semiparametric detection of significant activation for brain fMRI
Creators: name: Zhang, Chunming
name: Yu, Tao
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62G08, 62G10 (Primary) 62F30, 65F50 (Secondary)

description: Functional magnetic resonance imaging (fMRI) aims to locate activated regions in human brains when specific tasks are performed. The conventional tool for analyzing fMRI data applies some variant of the linear model, which is restrictive in modeling assumptions. To yield more accurate prediction of the time-course behavior of neuronal responses, the semiparametric inference for the underlying hemodynamic response function is developed to identify significantly activated voxels. Under mild regularity conditions, we demonstrate that a class of the proposed semiparametric test statistics, based on the local linear estimation technique, follow $χ^2$ distributions under null hypotheses for a number of useful hypotheses. Furthermore, the asymptotic power functions of the constructed tests are derived under the fixed and contiguous alternatives. Simulation evaluations and real fMRI data application suggest that the semiparametric inference procedure provides more efficient detection of activated brain areas than the popular imaging analysis tools AFNI and FSL.
description: Published in at http://dx.doi.org/10.1214/07-AOS519 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Chaos, entanglement and decoherence in the quantum kicked top
Creators: name: Ghose, S.
name: Stock, R.
name: Jessen, P. S.
name: Lal, R.
name: Silberfarb, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the interplay of chaos, entanglement and decoherence in a system of qubits whose collective behaviour is that of a quantum kicked top. The dynamical entanglement between a single qubit and the rest can be calculated from the mean of the collective spin operators. This allows the possibility of efficiently measuring entanglement dynamics in an experimental setting. We consider a deeply quantum regime and show that signatures of chaos are present in the dynamical entanglement for parameters accessible in an experiment that we propose using cold atoms. The evolution of the entanglement depends on the support of the initial state on regular versus chaotic Floquet eigenstates, whose phase-space distributions are concentrated on the corresponding regular or chaotic eigenstructures. We include the effect of decoherence via a realistic model and show that the signatures of chaos in the entanglement dynamics persist in the presence of decoherence. In addition, the classical chaos affects the decoherence rate itself.
description: 11 pages, 9 figures
Effective Scenario of Loop Quantum Cosmology
Creators: name: Ding, You
name: Ma, Yongge
name: Yang, Jinsong
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Semiclassical states in isotropic loop quantum cosmology are employed to show that the improved dynamics has the correct classical limit. The effective Hamiltonian for the quantum cosmological model with a massless scalar field is thus obtained, which incorporates also the next to leading order quantum corrections. The possibility that the higher order correction terms may lead to significant departure from the leading order effective scenario is revealed. If the semiclassicality of the model is maintained in the large scale limit, there are great possibilities for $k=0$ Friedmann expanding universe to undergo a collapse in the future due to the quantum gravity effect. Thus the quantum bounce and collapse may contribute a cyclic universe in the new scenario.
description: 4 pages, 2 figures; version published in PRL
C, P, and T of Braid Excitations in Quantum Gravity
Creators: name: He, Song
name: Wan, Yidun
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the discrete transformations of four-valent braid excitations of framed spin networks embedded in a topological three-manifold. We show that four-valent braids allow seven and only seven discrete transformations. These transformations can be uniquely mapped to C, P, T, and their products. Each CPT multiplet of actively-interacting braids is found to be uniquely characterized by a non-negative integer. Finally, braid interactions turn out to be invariant under C, P, and T.
description: 28 pages, 5 figures, version accepted by Nucl. Phys. B
DE LA GOUVERNANCE DU PARC AUTOMOBILE AU SUD-KIVU: DEFIS ET OPPORTUNITES INFORMATIQUES DANS LA GESTION DE CIRCULATION ROUTIERE A BUKAVU
Creators: name: Joseph ISHARA KASEKE
Publisher: name: Zenodo
Year: 2025

description: La ville de Bukavu capitale de la province  du Sud-Kivu est souvent marquée par les embouteillages et accidents de circulation routière au moment où on observe dans presque chaque carrefour des artères de la ville de Bukavu les Policiers de Circulation Routière (PCR) dont l’un de leurs objectifs est de réguler la circulation routière. Dans notre recherche, nous avons remarqué que la variable qui occasionne ces deux problèmes c’est le système instauré par les PCR et les conducteurs des véhicules dit « MASSAGE ». Ce système rend les PCR inefficaces et aux  services étatiques de ne pas maximiser les recettes publiques. La solution à cette problématique est d’informatiser ce secteur en créant un guichet unique.
Halting eternal acceleration with an effective negative cosmological constant
Creators: name: Cardone, Vincenzo F.
name: Cardenas, Rolando P.
name: Nodal, Yoelsy Leiva
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In order to solve the problem of eternal acceleration, a model has been recently proposed including both a negative cosmological constant $Λ$ and a scalar field evolving under the action of an exponential potential. We further explore this model by contrasting it against the Hubble diagram of Type Ia supernovae, the gas mass fraction in galaxy clusters and the acoustic peak and shift parameters. It turns out that the model is able to fit quite well this large dataset so that we conclude that a negative $Λ$ is indeed allowed and could represent a viable mechanism to halt eternal acceleration. In order to avoid problems with theoretical motivations for both a negative $Λ$ term and the scalar field, we reconstruct the gravity Lagrangian $f(R)$ of a fourth order theory of gravity predicting the same dynamics (scale factor and Hubble parameter) as the starting model. We thus end up with a $f(R)$ theory able to both fit the data and solve the problem of eternal acceleration without the need of unusual negative $Λ$ and ad hoc scalar fields.
description: 31 pages, 6 figures, accepted for publication on Classical and Quantum Gravity
The making of the artist, from 'genius' to 'professional': social value and individualisation in UK visual artists, 1980–2010
Creators: name: Telese, Emilia
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 169999 Studies in Human Society not elsewhere classified
subject: FOS: Sociology

description: The purpose of this thesis is to identify the main characteristics of the perceived relationship between a group of individual visual artists and the fabric of the economy and society in the UK from 1980 to 2010. The study draws upon primary sources using interviews with 27 artists who were practising in the UK at early or mid-career level in 1980, 1990, 2000 and 2010. It also makes use of the archive of A-N magazine, a national magazine aimed at visual artists, funded in 1980 by what is now A-N The Artists’ Information Company. Anthropology, art history and art economy have traditionally associated visual artists with the idea of the “genius” separated from mainstream society and relatively uninterested in material achievements such as making a living. My literature review highlights a lack of longitudinal studies in the careers of UK visual artists, as well as a dearth of studies in how artists are trusted or not by society. The thesis asks how a group of artists saw themselves in relationship to the UK’s society and economy in 1980 - 2010 and compares it to their current perception of their profession. Through a series of 27 qualitative interviews, the study highlights the interviewees’ relationship with society and identifies a series of constraints they felt, as well a set of prejudices regarding the value and respectability of their profession, as well as gender and social class bias, and the artists’ place in the community. My research also shows a progressive individualisation of the artist in the UK economy caused by a number of causes, including cultural policy choices ramifications, changes in the public perception of the artist’s profession and inherent technical and philosophical shifts in the way visual art has been made in the past century. My findings also identify dichotomies between the interviewed artists’ perceived need to make a living and the problematic/conflictual relationship they have with the idea of being an artist and making it into a career, linked to the dynamics of the UK art world.The relevance of this study is that it informs our understanding of visual artists and their relation to the UK economy and society by introducing an oral history approach and a focus on trust and stereotypes.
Supplementary Information for Park G. and H.G. Dam. Cell-Growth Gene Expression Reveals a Direct Fitness Cost of Grazer-Induced Toxin Production in Red Tide Dinoflagellate Prey. Proc. Royal Society B. from Cell-growth gene expression reveals a direct fitness cost of grazer-induced toxin production in red tide dinoflagellate prey
Creators: name: Park, Gihong
name: Dam, Hans G.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology

description: Appendices 1-4
An examination of citizen participation in health planning in the Northwest Territories: the Fort Providence Senior Citizens’ Home
Creators: name: Cawsey, James Frederick
Publisher: name: University of British Columbia
Year: 2010

description: In the 1970’s the Government of the Northwest Territories was seeking to involve communities in the decisionmaking process about the allocation, priority setting and program and facilities design issues in the sphere of health services. As a result of this desire, relationships were being forged which emphasized a sense of partnership between government at different levels and community groups. In fact, considerable bureaucratic effort was put into the determination of how the communities should provide their participation. This eventually became known, informally at least, as the "community participation methodology". During a forty-one month period (March, 1977 to August, 1980) this methodology was implemented and eventually culminated in the construction of a senior citizens' home in the community of Fort Providence. It is the concern of this thesis to examine that methodology by asking the following question: "How useful and applicable is the Northwest Territories' community participation approach in the planning and development of facilities, specifically for the elderly?" In addressing this question several issues had to be considered. First, what were the objectives of the participants and were they compatible? What were the potential obstacles to the participation process and were they reckoned with? How did the participation process actually occur if, in fact, it did occur? In other words, the efforts of the bureaucrats had to be analyzed in terms of what they hoped to accomplish, how they attempted to accomplish their goal(s) and what they actually achieved. Another problem faced by this examination was the question of theoretical framework. The thesis was a retrospective examination which meant the planners' concepts had to be discussed in terms of theoretical concepts to determine if there is a theoretical basis for the applied concepts and whether or not these strategies were appropriate to this example. It was suggested that the theories of John Foskett, Edmund Burke and Sherri Arnstein were in support of the bureaucrats' efforts. The findings of the examination were that the participants' objectives were compatible; the planners were cognizant of the potential constraints inherent in this project and endeavoured to eliminate or minimize the consequences of these constraints; and, the methodology was successful in achieving participation. With respect to the participation, the thesis concludes that the participation achieved was actually only tokenism and that true participation did not really occur. This then throws the question of utility and applicability of the methodology into doubt. The thesis concludes that everything worked this time because the assumptions of the participants were the same. The thesis closes, however, with a suggestion that the basic assumptions concerning health care are changing.
title: Geschlechter(un)gerechtigkeit an Hochschulen in Nordrhein-Westfalen – der Gender-Report
Creators: name: Hendrix, Ulla
name: Hilgemann, Meike
name: Kotendiek, Beate
name: Niegel, Jennifer
Publisher: name: Humboldt-Universität zu Berlin
Year: 2014
Subjects: subject: Evaluation
subject: Gender-Report
subject: Geschlechtergerechtigkeit
subject: Gleichberechtigung
subject: Gleichstellung
subject: Hochschule
subject: Statistik
subject: Wissenschaft
subject: ddc:370

description: Mit dem Gender-Report über die Hochschulen in Trägerschaft des Landes Nordrhein-Westfalen wurde 2010 zum ersten Mal ein Bericht über den Stand der Geschlechter(un)- gerechtigkeit an Hochschulen auf der Ebene eines Bundeslandes vorgelegt; die Fortschreibung erfolgte mit dem Gender-Report 2013. Der Bericht wird durch die Koordinationsund Forschungsstelle des Netzwerks Frauen und Geschlechterforschung NRW erstellt. Im Beitrag wird der Entstehungszusammenhang nachgezeichnet und es werden ausgewählte Ergebnisse des neuen Gender-Reports 2013 zu Hochschulentwicklungen, Gleichstellungspraktiken und Wissenschaftskarrieren vorgestellt. Abschließend geht es um die Möglichkeiten des Transfers der Ergebnisse in die Gleichstellungspraxis.
Indications of Universal Excess Fluctuations in Nonequilibrium Systems
Creators: name: Yuge, Tatsuro
name: Shimizu, Akira
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The fluctuation in electric current in nonequilibrium steady states is investigated by molecular dynamics simulation of macroscopically uniform conductors. At low frequencies, appropriate decomposition of the spectral intensity of current into thermal and excess fluctuations provides a simple picture of excess fluctuations behaving as shot noise. This indicates that the fluctuation-dissipation relation may be violated in a universal manner by the appearance of shot noise for a wide range of systems with particle or momentum transport.
description: 4 pages, 4 figures; title changed, major revision; to appear in J. Phys. Soc. Jpn
Structure of upper g9/2-shell nuclei and shape effect in the 94Ag isomeric states
Creators: name: Kaneko, K.
name: Sun, Y.
name: Hasegawa, M.
name: Mizusaki, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using a shell model which is capable of describing the spectra of upper $g_{9/2}$-shell nuclei close to the $N=Z$ line, we study the structure of two isomeric states $7^{+}$ and $21^{+}$ in the odd-odd $N=Z$ nucleus $^{94}$Ag. It is found that both isomeric states exhibit a large collectivity. The $7^{+}$ state is oblately deformed, and is suggested to be a shape isomer in nature. The $21^{+}$ state becomes isomeric because of level inversion of the $19^{+}$ and $21^{+}$ states due to core excitations across the $N=Z=50$ shell gap. Calculation of spectroscopic quadrupole moment indicates clearly an enhancement in these states due to the core excitations. However, the present shell model calculation that produces the $19^{+}$-$21^{+}$ level inversion cannot accept the large-deformation picture of Mukha {\it et al.} in Nature {\bf 439}, 298 (2006).
description: 10 pages, 14 figures, accepted for publication in Phys. Rev. C
Design editorial como potencial criativo de editoras independentes brasileiras
Creators: name: Depexe, Sandra
Publisher: name: Labfront/UEMG
Year: 2023

description: Em observação aos vínculos entre economia, desenvolvimento e inovações culturais, considerarmos o campo editorial como parte da indústria criativa. A qualidade cultural e criativa das publicações é usualmente posta como elemento de diferenciação entre editoras, remetendo a modos de produção e modelos de negócios variados. Tomamos as distinções que Pierre Bourdieu atribui ao campo da produção dos bens culturais, entre pólo comercial e pólo cultural, como ponto de partida para refletir sobre o potencial criativo de editoras independentes brasileiras. Para análise, elegemos livros de editoras independentes e categorias atreladas à produção gráfica em tensão ao conceito e conteúdo da obra. Debatemos a criatividade em produção editorial e atestamos que o design editorial voltado à experimentação gráfica da materialidade articulada ao desenvolvimento narrativo conduz à construção simbólica de um livro potencialmente criativo e inovador.
title: Karrieren von Frauen in Unternehmen – Chancen erhöhen mit der Gender-und-Diversity-Strategie
Creators: name: Macha, Hildegard
Publisher: name: Humboldt-Universität zu Berlin
Year: 2014
Subjects: subject: Evaluation
subject: Frauen
subject: Führungspositionen
subject: Karriere
subject: pädagogische Intervention
subject: Transformatives Organisationales Lernen
subject: ddc:300

description: Dieser Beitrag zeigt, mit welchen Effekten zu rechnen ist, wenn in Unternehmen mit der Gender-und-Diversity-Strategie ein Bewusstseinsprozess durch Weiterbildungstrainings zugunsten von Frauenkarrieren erreicht werden soll. Auf der Basis fundamentaler Ergebnisse der Genderforschung werden EntscheidungsträgerInnen in Unternehmen darin geschult und beraten, langfristig zu einem Abbau hierarchischer Geschlechterverhältnisse beizutragen. Aufbauend auf theoretischen Grundlagen der Genderforschung werden hierfür ein pädagogisches Interventions- und ein Evaluationsdesign entwickelt, in der Praxis mit 20 Klein- und Mittelständischen Unternehmen (KMU) umgesetzt und mit wissenschaftlicher Evaluation auf seine Wirksamkeit hin überprüft. Die Datenanalyse belegt, wie die Gender-und-Diversity-Strategie in der unternehmerischen Praxis zu einem Prozess des organisationalen Lernens führt, der Karrieren von Frauen besser zu fördern erlaubt und insgesamt zu mehr Geschlechtergerechtigkeit führt. Der methodische Zusammenhang zwischen Theorie, Intervention und Evaluation wird bestätigt.
Long term diatom community dynamics of a lowland UK river from a 30 year biomonitoring record. Impacts of hydrology climate and pollution
Creators: name: Jones, Chris
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 49999 Earth Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences

description: Anthropogenic impacts on surface waters have resulted in a deterioration in water quality, habitat, and ecosystem functions. Improvements to wastewater practices, however, have not yielded the desired effect of improved ecological status, which leads to the deferral of targets by policy makers. In this regard, lowland rivers in industrialised regions present a challenging area for research, representing a dynamic system with multiple interconnected physical and chemical processes. As such, the main drivers of changes to this ecosystem are poorly understood despite the main principles of biological responses being well documented. Macrophytes and microphytobenthos have been identified as a useful component of the river ecosystem to monitor ecosystem health and integrity; and adopted for the routine monitoring of the ecological status of inland waters. This study presents a unique, 29-year biological record of periphytic diatom communities from artificial substrates, paired with secondary environmental and hydrological data derived from a routine water quality monitoring time series at Darley Abbey on the River Derwent, upstream of the city of Derby. Multivariate analysis is implemented to identify the main drivers of diatom community dynamics within antecedent environmental conditions, over a period of shifts in water quality management strategies, climate, and flow regime. Results are compared to common diatom indices (metrics designed to assess ecological status) and their effectiveness in characterising the underlying processes in the context of a large lowland UK river is discussed. The study also presents a novel method (using artificial substrates; SterlininTM tubes) for the sampling of diatom communities in the routine monitoring of larger water bodies, and its performance relative to other popular methods is assessed. Sterilin tubes are presented as a suitable artificial substrate for community analysis of diatoms, replicates demonstrated limited variability between samples and adequately represented communities from natural substrates, there was little evidence of substrate specific selection pressure. The site and substrate specific colonisation processes are investigated. The Derwent remains under a state of nutrient enrichment; the main response of diatom communities is along a nitrogen and temperature gradient, phosphorus concentrations proved important between 1998 and 2007 but not in the context of the entire record. Flow too is important, notably the variability in high flow events and the duration of low flow periods, and there is evidence that metal pollution is still significant within the catchment. The performance of diatom indices raises questions on their implementation in post-industrial lowland rivers.
Scaling properties of critical bubble of homogeneous nucleation in stretched fluid of square-gradient density-functional model with triple-parabolic free energy
Creators: name: Iwamatsu, Masao
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The square-gradient density-functional model with triple-parabolic free energy is used to study homogeneous bubble nucleation in a stretched liquid to check the scaling rule for the work of formation of the critical bubble as a function of scaled undersaturation $Δμ/Δμ_{\rm spin}$, the difference in chemical potential $Δμ$ between the bulk undersaturated and saturated liquid divided by $Δμ_{\rm spin}$ between the liquid spinodal and saturated liquid. In contrast to our study, a similar density-functional study for a Lennard-Jones liquid by Shen and Debenedetti [J. Chem. Phys. {\bf 114}, 4149 (2001)] found that not only the work of formation but other various quantities related to the critical bubble show the scaling rule, however, we found virtually no scaling relationships in our model near the coexistence. Although some quantities show almost perfect scaling relations near the spinodal, the work of formation divided by the value deduced from the classical nucleation theory shows no scaling in this model even though it correctly vanishes at the spinodal. Furthermore, the critical bubble does not show any anomaly near the spinodal as predicted many years ago. In particular, our model does not show diverging interfacial width at the spinodal, which is due to the fact that compressibility remains finite until the spinodal is reached in our parabolic models.
description: 10 pages, 10 figures, Journal of Chemical Physics accepted for publication
Interplay between 3d and 4f magnetism in CeCoPO
Creators: name: Krellner, C.
name: Burkhardt, U.
name: Geibel, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The ground state properties of CeCoPO, a homologue of the new high temperature superconductors RFePnO1-xFx, were studied by means of susceptibility, specific heat, and resistivity measurements on polycrystals. The observation of a well defined Curie-Weiss behavior above 230K with mu_eff=2.9mu_B and a ferromagnetic ordering below T_C=75K is similar to what was observed in LaCoPO and points to magnetism of the Co-3d electrons. However, the Ce-ions are on the border to magnetism with a Kondo scale of T_K~40K and show an enhanced Sommerfeld-coefficient of γ~200mJ/molK^2.
description: Fig 1 and Ref. updated, typos corrected
A Context-aware Radio Resource Management in Heterogeneous Virtual RANs
Creators: name: Tripathi, Sharda
name: Puligheddu, Corrado
name: Chiasserini, Carla Fabiana
name: Mungari, Federico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: New-generation wireless networks are designed to support a wide range of services with diverse key performance indicators (KPIs) requirements. A fundamental component of such networks, and a pivotal factor to the fulfillment of the target KPIs, is the virtual radio access network (vRAN), which allows high flexibility on the control of the radio link. However, to fully exploit the potentiality of vRANs, an efficient mapping of the rapidly varying context to radio control decisions is not only essential, but also challenging owing to the interdependence of user traffic demand, channel conditions, and resource allocation. Here, we propose CAREM, a reinforcement learning framework for dynamic radio resource allocation in heterogeneous vRANs, which selects the best available link and transmission parameters for packet transfer, so as to meet the KPI requirements. To show its effectiveness, we develop a testbed for proof-of-concept. Experimental results demonstrate that CAREM enables an efficient radio resource allocation under different settings and traffic demand. Also, compared to the closest existing scheme based on neural network and the standard LTE, CAREM exhibits an improvement of one order of magnitude in packet loss and latency, while it provides a 65% latency improvement relatively to the contextual bandit approach.
description: Accepted for publication in IEEE Transactions on Cognitive Communications and Networking
On higher-power moments of $Δ(x)$(II)
Creators: name: Zhai, Wenguang
Publisher: name: arXiv
Year: 2008
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11N37, 11M06

description: Let $Δ(x)$ be the error term of the Dirichlet divisor problem. The asymptotic formula of the integral $\int_1^TΔ^k(x)dx$ is established for any integer $3\leq k\leq 9$ by an unified method. Similar results are also established for some other well-known error terms in the analytic number theory.
description: 23 Pages, 20 references
Identification and seasonality studies of the Synuraceae (Chrysophyta) of selected lakes of the Lower Fraser Valley, British Columbia
Creators: name: Donaldson, Deborah Anne
Publisher: name: University of British Columbia
Year: 2010

description: A comparative, year long (15 month) study of three lakes (Whonock, Munday, Como) in the Lower Fraser Valley, British Columbia was undertaken to gain information on the physicochemical and seasonal limits of scale-bearing Synuraceae (Chrysophyta). In addition, sporadic collections were made in different lakes in this region to augment the information provided from the three main lakes. The synuracean taxa are reviewed with worldwide distribution lists, and environmental and seasonal information are discussed. Thirty-one taxa of Chrysophyceae were identified, of which 20 are in the Synuraceae. Eight taxa within this family are new records for British Columbia, viz. : Mallomonas cratis var. asmundiae Wujek et Van der Veer Mallomonas papillosa Harris et Bradley Mallomonas doignonii var. tenuicostis Asmund et Cronberg Mallomonas transsylvanica Peterfi et Momeu Mallomonopsis ouradion (Harris et Bradley) Harris Paraphysomonas vestita (Stokes) de Saedeleer Synura splendida Korshikov Synura glabra Korshikov It was found that the Synuraceae are not restricted to cold waters, as often assumed. Some taxa are present throughout the year. They do seem to favour acidic and sometimes dystrophic environments, and it is suggested that factors such as pH or water chemistry should be investigated as probable controlling factors for synuracean populations. Of the 11 non-synuracean Chrysophyceae noted', six are new records for the Province: Bicoeca kepneri, Chrysococcystis elegans, Dinobryon crenulatum, Epipyxis lauterbornii, Epipyxis utriculus var. acuta, and Eusphaerella turfosa.
What Makes Agile Software Development Agile?
Creators: name: Kuhrmann, Marco
name: Tell, Paolo
name: Hebig, Regina
name: Klünder, Jil
name: Münch, Jürgen
name: Linssen, Oliver
name: Pfahl, Dietmar
name: Felderer, Michael
name: Prause, Christian R.
name: MacDonell, Stephen G.
name: Nakatumba-Nabende, Joyce
name: Raffo, David
name: Beecham, Sarah
name: Tüzün, Eray
name: López, Gustavo
name: Paez, Nicolas
name: Fontdevila, Diego
name: Licorish, Sherlock A.
name: Küpper, Steffen
name: Ruhe, Günther
name: Knauss, Eric
name: Özcan-Top, Özden
name: Clarke, Paul
name: McCaffery, Fergal
name: Genero, Marcela
name: Vizcaino, Aurora
name: Piattini, Mario
name: Kalinowski, Marcos
name: Conte, Tayana
name: Prikladnicki, Rafael
name: Krusche, Stephan
name: Coşkunçay, Ahmet
name: Scott, Ezequiel
name: Calefato, Fabio
name: Pimonova, Svetlana
name: Pfeiffer, Rolf-Helge
name: Schultz, Ulrik Pagh
name: Heldal, Rogardt
name: Fazal-Baqaie, Masud
name: Anslow, Craig
name: Nayebi, Maleknaz
name: Schneider, Kurt
name: Sauer, Stefan
name: Winkler, Dietmar
name: Biffl, Stefan
name: Bastarrica, Maria Cecilia
name: Richardson, Ita
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Together with many success stories, promises such as the increase in production speed and the improvement in stakeholders' collaboration have contributed to making agile a transformation in the software industry in which many companies want to take part. However, driven either by a natural and expected evolution or by contextual factors that challenge the adoption of agile methods as prescribed by their creator(s), software processes in practice mutate into hybrids over time. Are these still agile? In this article, we investigate the question: what makes a software development method agile? We present an empirical study grounded in a large-scale international survey that aims to identify software development methods and practices that improve or tame agility. Based on 556 data points, we analyze the perceived degree of agility in the implementation of standard project disciplines and its relation to used development methods and practices. Our findings suggest that only a small number of participants operate their projects in a purely traditional or agile manner (under 15%). That said, most project disciplines and most practices show a clear trend towards increasing degrees of agility. Compared to the methods used to develop software, the selection of practices has a stronger effect on the degree of agility of a given discipline. Finally, there are no methods or practices that explicitly guarantee or prevent agility. We conclude that agility cannot be defined solely at the process level. Additional factors need to be taken into account when trying to implement or improve agility in a software company. Finally, we discuss the field of software process-related research in the light of our findings and present a roadmap for future research.
description: Journal paper, 17 pages, 14 figures
The gravitational field of a light wave
Creators: name: van Holten, J. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: According to the classical Einstein-Maxwell theory of gravity and electromagnetism, a light-wave traveling in empty space-time is accompanied by a gravitational field of the pp-type. Therefore point masses are scattered by a light wave, even if they carry no electric or magnetic charge, or dipole moment. In this paper I present the explicit form of the metric and curvature for both circularly and linearly polarized light, and discuss the geodesic motion of test masses. This is followed by a discussion of classical scattering of point particles by the gravitational field associated with a circularly polarized electromagnetic block wave. A generalization to a quantum theory of particles in the background of these classical wave fields is presented in terms of the covariant Klein-Gordon equation. I derive the energy spectrum of quantum particles in the specific case of the circularly polarized block wave. Finally, a few general remarks on the extension to a quantum light wave are presented.
description: 15 pages, 2 figures
A Co-Scaling Grid for Athena++
Creators: name: Habegger, Roark
name: Heitsch, Fabian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present a co-scaling grid formalism and its implementation in the magnetohydrodynamics code Athena++. The formalism relies on flow symmetries in astrophysical problems involving expansion, contraction, and center-of-mass motion. The grid is evolved at the same time order as the fluid variables. The user specifies grid evolution laws, which can be independent of the fluid motion. Applying our implementation to standard hydrodynamic test cases leads to improved results and higher efficiency, compared to the fixed-grid solutions.
description: 11 pages, 8 figures
title: Vereinbarkeitspolitik als Karrierepolitik – empirische Befunde und theoretische Überlegungen
Creators: name: Gottwald, Markus
Publisher: name: Humboldt-Universität zu Berlin
Year: 2014
Subjects: subject: Karriere
subject: Neoinstitutionalismus
subject: Soziale Ungleichheit
subject: Steuerung
subject: Übersetzungstheorie
subject: Vereinbarkeit
subject: ddc:300

description: Die rezente Vereinbarkeitsforschung legt vielfach nahe, dass Unternehmen auf die politische Erwartung, familienfreundliche Personalpolitik zu betreiben, überwiegend mit einem decoupling reagieren. Im Beitrag werden drei Organisationsfallstudien vorgestellt, die diesen Befund im Prinzip bestätigen, darüber hinaus aber Ergebnisse liefern, die sich mit dem neoinstitutionalistischen Erklärungsmodell nicht fassen lassen, u. a. Vereinbarkeitspolitik als Karrierepolitik. Die Fälle veranlassen dazu, das decoupling mit den Mitteln der pragmatistischen Differenzierungstheorie (Renn 2006) zu reformulieren – es lässt sich auch als eine kontextsensible Übersetzung verstehen. Dass sich darüber zu einer steuerungs-, herrschafts- und ungleichheitssoziologischen Analyse kommen lässt, führt der Beitrag am Material vor. Abschließend werden zwei Thesen formuliert, die das Vereinbarkeitsgeschehen in den Betrieben als nichtintendierten Nebeneffekt politischer Steuerung deuten.
Intermediate-range Casimir-Polder interaction probed by high-order slow atom diffraction
Creators: name: Garcion, C
name: Fabre, N
name: Bricha, H
name: Perales, F
name: Scheel, S
name: Ducloy, M
name: Dutier, G
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: At nanometer separation, the dominant interaction between an atom and a material surface is the fluctuation-induced Casimir-Polder potential. We demonstrate that slow atoms crossing a silicon nitride transmission nanograting are a remarkably sensitive probe for that potential. A 15% difference between nonretarded (van der Waals) and retarded Casimir-Polder potentials is discernible at distances smaller than 51 nm. We discuss the relative influence of various theoretical and experimental parameters on the potential in detail. Our work paves the way to high-precision measurement of the Casimir-Polder potential as a prerequisite for understanding fundamental physics and its relevance to applications in quantum-enhanced sensing.
Enhanced Sensitivity Beam Emission Spectroscopy System for Nonlinear Turbulence Measurements
Creators: name: Gupta, Deepak K
name: Fonck, Raymond J
name: McKee, George R
name: Schlossberg, David J
name: Shafer, Morgan W
Publisher: name: arXiv
Year: 2008
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: An upgraded Beam Emission Spectroscopy (BES) system has been deployed to access low amplitude turbulence regions near internal transport barriers on the DIII-D tokamak. Sixteen high sensitivity channels are being installed. A significant increase in total signal to noise is achieved by: 1.) Increased spatial volume sampling tailored to known turbulence characteristics; 2.) An increased throughput spectrometer assembly to isolate the local beam fluorescence, coupled to new large-area photoconductive photodiodes; 3.) A new sharp edge interference filter designed to optimize detection of the beam emission plus a significant fraction of the thermal deuterium charge exchange. A new data acquisition system has been installed, providing an 8 times increase in integration time or an increased sample rate. Preliminary results from the upgraded system show a signal enhancement of greater than an order of magnitude. A clear broadband density fluctuation signal is observed in H-mode discharges with the upgraded BES system, demonstrating the significant performance enhancement.
description: HTPD-2004
Enhancing high frequency sensitivity of gravitational wave detectors with sloshing-Sagnac interferometer
Creators: name: Zhang, Teng
name: Martynov, Denis
name: Danilishin, Stefan
name: Miao, Haixing
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Sensitivity of gravitational-wave detectors is limited in the high-frequency band by quantum shot noise and eventually limited by the optical loss in signal recycling cavity. This limit is the main obstacle on the way to detect gravitational waves from the binary neutron star mergers in the current and the future generation detectors, as it does not depend on either the arm length, or the injected squeezing level. In this paper, we come up with the sloshing Sagnac interferometer topology, which can be obtained from the Michelson interferometer by optically connecting the end mirrors into an additional optical cavity. This transforms the interferometer into a triply-coupled cavity system capable of beating the loss-induced high-frequency limit of the signal-recycled Michelson interferometer. With advanced LIGO+ comparable parameters, a sloshing-Sagnac scheme can achieve 7 times better sensitivity at 2.5\,kHz or 4 times better signal to noise ratio for a typical waveform of binary neutron post merge. Being an evolution of Michelson interferometer, the sloshing-Sagnac interferometer can possibly be used as a topology for the future generation detectors and upgrade of current detectors.
The Systematic Design of Non-commensurate Impedance Matching Tapers for Ultra Wideband Gradient-Index (GRIN) Lens Antennas
Creators: name: wang, Wei
name: Garcia, Nicolas
name: Chisum, Jonathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We propose a general method for designing wideband matching tapers in inhomogeneous media where phase velocity is coupled to the taper impedance profile. Such tapers are used to match wideband gradient index (GRIN) lens antennas. To simplify fabrication tapers are often constrained to physically uniform layers wherein commensurate line theory cannot predict the frequency response. Therefore, we present a new design algorithm which derives an effective permittivity $ε_{eff}$ to equalize the electrical length of commensurate and non-commensurate line tapers. The algorithm provides a systematic design method with predictable frequency response for non-commensurate line tapers. Nevertheless, there are several unavoidable nonidealities present in such discretized tapers which we discuss and provide recommendations for mitigation. The algorithm is used to design a Klopfenstein taper with return loss better than 15 dB from 8 to 78 GHz. The design is fabricated and measurements agree with simulation across the WR90, WR28, and WR12 bands. An approximate efficiency formula is proposed which predicts aperture efficiency of taper-matched lenses without the need for time-consuming full-wave simulations. Various lenses are designed and compared to highlight the advantages of Klopfenstein tapers in GRIN lens design. The results demonstrate the usefulness of the proposed design method.
description: 11 pages, 9 figures. Accepted June 5, 2021 for publication in IEEE Trans. Antennas Propag
title: On the parameterisation of convection in the ‘grey-zone’
Creators: name: Chui, Chuen Chung
Publisher: name: University of Reading
Year: 2021

description: Representing convection at kilometre-scale resolution (also known as the ‘grey-zone’) has been a challenge for numerical modellers. Conventional parameterisation approaches rely on assumptions only valid for very coarse resolution simulation and so cannot be applied at this resolution. However, the ‘grey zone’ is not sufficiently fine to fully resolve convective updraughts. A new approach towards solving the problem is proposed. The new Stochastic Explicitly Prognostic Mass Flux (SEP-MF) scheme features a stochastic triggering function based on the occurrence and strength of boundary layer thermals, as well as a fully prognostic (growth) plume model in which prognostic equations representing the evolution of sub-grid convection are solved explicitly. The SEP-MF scheme was tested in a case featuring a diurnal cycle of convection, a phenomenon which is known to be difficult to simulate. Results from this study suggest that the SEP-MF scheme is capable of producing scale-independent solutions of the diurnal cycle of convection, as well as improving the overall performance of kilometre-scale models in representing convection.