cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Reliability Improvement of Sensors Used in Personal Navigation Devices
Creators: name: Dhital, Anup
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Engineering
subject: Personal Navigation
subject: Reliability
subject: Sensors

description: Along with advancements in microelectromechanical system (MEMS) technology, many modern personal navigation devices incorporate measurements from various sensors alongside Global Navigation Satellite Systems (GNSS) receivers. Despite using these sensors, GNSS still remains an important component of these navigation devices in view of its absolute positioning capability. Thus, when it comes to navigating in GNSS signal degraded areas like in urban and natural canyons, the performance of such multi-sensor integrated navigation systems is still found to be sub-optimal. In particular, existing filtering algorithms are often unreliable in such environments. This affects the usability of such personal navigation devices in some applications where reliability is a critical parameter. Moreover, reliability can be further degraded by the occurrence of faults in other sensors besides GNSS. This research thus develops several algorithm modules with an ultimate goal of improving the performance, and especially reliability, for low cost multi-sensor integrated navigation systems. Among the proposed algorithm modules, the first method modifies the filtering algorithm by replacing the assumption of normal distribution of GNSS measurements with that of a heavy-tailed distribution. The second module adapts the covariance of the GNSS measurements to match the true error characteristics of the surrounding environment, based on the consistency of GNSS derived user acceleration values to those obtained from inertial measurement units. Finally, a third algorithm module detects possible faults arising in various sensors. Based on the type of sensor fault, the algorithm either rejects some of the measurements before they enter the integration filter, issues a warning signal to indicate lack of reliability information or deems the navigation solution unusable. The proposed algorithms are tested with numerous field data sets collected in various environments as well as with carefully simulated faults that are added to clean measurements. The analysis of the results obtained using the proposed methods indicate a significant improvement in the reliability of the navigation solution. The average improvement in the reliability varied between 15 % and 26 % for the data sets used in the analysis. Position accuracy was also found to improve. In particular, maximum position errors are significantly decreased, up to a factor of 2.5 in some cases. Finally, the simulated as well as actual faults occurring in the sensor measurements were also correctly detected.
FLArE up dark sectors with EM form factors at the LHC Forward Physics Facility
Creators: name: Kling, Felix
name: Kuo, Jui-Lin
name: Trojanowski, Sebastian
name: Tsai, Yu-Dai
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Despite being mostly secluded, dark sector particles may feebly interact with photons via a small mass-dimension 4 millicharge, a mass-dimension 5 magnetic and electric dipole moment, or a mass-dimension 6 anapole moment and charge radius. If sufficiently light, the LHC may produce an intense and collimated beam of these particles in the far forward direction. We study the prospects of searching for such dark sector particles with electromagnetic form factors via their electron scattering signature in the Forward Liquid Argon Experiment (FLArE) detector at the Forward Physics Facility (FPF). We find that FLArE can provide new probes of sub-GeV dark particles with dipole moments and strong sensitivities for millicharged particles in the 100 MeV to 100 GeV region. This complements other search strategies using scintillation signatures or dark matter direct detection and allows for probing strongly interacting dark matter motivated by the EDGES anomaly. Along with the FORMOSA detector, this leads to a very diverse and leading experimental program in the search for millicharged particles in the FPF.
description: 11 pages, 3 figures
Partially Linear Single-Index Models with Current Status Data
Creators: name: Pordeli, Pooneh
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Statistics
subject: FOS: Mathematics
subject: Survival Analysis
subject: Current Status Data
subject: Single-index Models
subject: Semiparametric Efficiency

description: In the field of survival analysis, there are mainly three types of censoring, (i) right censoring, (ii) left censoring, and (iii) interval censoring. In my research, we focus on case I interval censoring, which is more challenging than right censoring, and for such data the methods developed for right censoring do not generally apply. Case I interval-censored or current status data arise in such areas as demography, economics, epidemiology and medical science. For example, events such as time to develop tumors (i.e. time to tumor onset) or time to develop HIV cannot be known exactly; only the occurrence in a time interval is known on examination. As another example, in laboratory studies, the relationship between the distribution of time to develop a specific disease of mice or rats and covariates of interest of these animals is of interest. The presence (or absence) of the disease is detectable only at death or sacrifice; we do not observe the exact onset time. In this dissertation, we propose three parsimonious regression models for analysis of current status data and overcome a phenomenon named "curse of dimensionality" by using partially linear single-index models which are well-known among dimension reduction methods. We use B-splines to approximate nonparametric functions and the sieve maximum likelihood method to obtain efficient estimators of the regression parameters. We derive large sample properties of the resulting estimators using martingale and counting process theory, conduct simulation studies to assess the proposed methods, and apply them to a real data set in analyzing probability of renal recovery of patients with acute kidney injury disease.
JUSTNORTH EU Integrated Arctic Policy Analysis Report and Recommendations. Key Challenge 7: Demographic Changes and Outmigration
Creators: name: JUSTNORTH
Publisher: name: Zenodo
Year: 2023
Subjects: Arctic economies, Economic development, Sustainable development, Values

description: Key Recommendations:
(R1) Implement EU regional development plans to ensure the viability of Arctic communities through a comprehensive justice-oriented approach
(R2) Focus more on the Arctic countryside and have a discussion – at European, national and regional levels – about the development of settlement and population structure
(R3) A sustainable land and urban planning can contribute to avoid demographic draining
Reference Model for Performance Management in Service-Oriented Virtual Organization Breeding Environments
Creators: name: Paszkiewicz, Zbigniew
name: Picard, Willy
Publisher: name: arXiv
Year: 2011
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: Performance management (PM) is a key function of virtual organization (VO) management. A large set of PM indicators has been proposed and evaluated within the context of virtual breeding environments (VBEs). However, it is currently difficult to describe and select suitable PM indicators because of the lack of a common vocabulary and taxonomies of PM indicators. Therefore, there is a need for a framework unifying concepts in the domain of VO PM. In this paper, a reference model for VO PM is presented in the context of service-oriented VBEs. In the proposed reference model, both a set of terms that could be used to describe key performance indicators, and a set of taxonomies reflecting various aspects of PM are proposed. The proposed reference model is a first attempt and a work in progress that should not be supposed exhaustive.
description: 10 pages
Intellectual Engagement in the Workplace: What did you do at work today?
Creators: name: Strachan, Laura
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Education--Adult and Continuing
subject: engagement
subject: Community
subject: Purpose
subject: Passion
subject: Workplace

description: This hermeneutic research study focuses on Intellectual Engagement in the Workplace. It is an unravelling of situated life stories of people in their “work” to provide intentionality. Four individuals from different careers were interviewed and the conversations taped and transcribed. Each participant was asked a set list of questions about engagement in their work. The key research question is “What did you do at work today?” A hermeneutic inquiry practice with emphasis on careful questioning, provides information on what allows individuals to be passionate and interested in their work. Through these interviews and research of engagement in the workplace, four common principles emerge. 1) The first principle is employers and individuals are creators of “possibilities”. Individuals are responsible for their own learning. No one else can do it for them. 2) The second principle is purposeful work, which is meaningful, fulfilling and personal, is “engaging”. The work individuals engage in expands if it is meaningful and purposeful for them. The participants in the interviews are working “beyond” the task at hand. 3) The third principle is directive boundaries with feedback, support and experiences enhance learning. Goals, feedback and mentors build successes for individuals to want to continue to learn and discover. Successes build self-efficacy in individuals. 4) Lastly, the fourth principle is the workplace is a place of “connection”. The workplace can create community and social belonging for individuals. The workplace has tremendous implications for the future of our learners and society.
Long waves instabilities
Creators: name: Bian, Dongfen
name: Grenier, Emmanuel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: The aim of this paper is to give a detailed presentation of long wave instabilities of shear layers for Navier Stokes equations, and in particular to give a simple and easy to read presentation of the study of Orr Sommerfeld equation and to detail the analysis of its adjoint. Using these analyses we prove the existence of long wave instabilities in the case of slowly rotating fluids, slightly compressible fluids and for Navier boundary conditions, under smallness conditions.
Offen für alle oder nicht ganz dicht? Wie österreichische Hochschulgeographinnen und -geographen die Idee offener Bildungsressourcen praktisch umsetzen (können)
Creators: name: Höferl, Karl Michael
Publisher: name: Zenodo
Year: 2020
Subjects: Wikimedia
Freies Wissen
Open Educational Resources
OER
offene Bildungsressourcen
Geographie
Hochschullehre
Österreich

description: Antrag beim Fellow Programm Freies Wissen 2020/2021 von Wikimedia Deutschland Abstract: Gerade weil sich die geographischen Hochschulinstitute Österreichs einem offenen und gleichberechtigten Zugang zur Bildung für nachhaltige Entwicklung verschreiben, überrascht die gefühlte Bedeutungslosigkeit offener Bildungsressourcen im Lehralltag. Um diesen Widerspruch besser zu verstehen, sollen erstmals Lehrende an den geographischen Hochschulinstituten Österreichs zum Stellenwert der Offenheit beim Erstellen, Teilen und Nutzen von Lern- und Lehrmaterialien und zu Vorbehalten gegenüber offenen Bildungsressourcen befragt werden. Wie diesen Vorbehalten begegnet werden kann, soll in einem Wikiversity Lernprojekt gezeigt und abschließend mit der Fachcommunity diskutiert werden.
Absorbing the Arrow of Electromagnetic Radiation
Creators: name: Hubert, Mario
name: Sebens, Charles T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We argue that the asymmetry between diverging and converging electromagnetic waves is just one of many asymmetries in observed phenomena that can be explained by a past hypothesis and statistical postulate (together assigning probabilities to different states of matter and field in the early universe). The arrow of electromagnetic radiation is thus absorbed into a broader account of temporal asymmetries in nature. We give an accessible introduction to the problem of explaining the arrow of radiation and compare our preferred strategy for explaining the arrow to three alternatives: (i) modifying the laws of electromagnetism by adding a radiation condition requiring that electromagnetic fields always be attributable to past sources, (ii) removing electromagnetic fields and having particles interact directly with one another through retarded action-at-a-distance, (iii) adopting the Wheeler-Feynman approach and having particles interact directly through half-retarded half-advanced action-at-a-distance. In addition to the asymmetry between diverging and converging waves, we also consider the related asymmetry of radiation reaction.
description: 42 pages, 6 figures
Magic composite pulses
Creators: name: Baudin, Emmanuel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: I describe composite pulses during which the average dipolar interactions within a spin ensemble are controlled while realizing a global rotation. The construction method used is based on the average Hamiltonian theory and rely on the geometrical properties of the spin-spin dipolar interaction only. I present several such composite pulses robust against standard experimental defects in NRM: static or radio-frequency field miscalibration, fields inhomogeneities. Numerical simulations show that the magic sandwich pulse sequence, a pulse sequence that reverse the average dipolar field while applied, is plagued by defects originating from its short initial and final π/2 radio-frequency pulses. Using the magic composite pulses instead of π/2 pulses improves the magic sandwich effect. A numerical test using a classical description of NMR allows to check the validity of the magic composite pulses and estimate their efficiency.
description: 22 pages, 6 figures
Decision aiding for coupled climate-energy strategies
Creators: name: Bessette, Douglas
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Geography
subject: Energy
subject: decision-making
subject: climate change

description: Researchers, technical experts and practitioners argue that both coupling energy and the environment in the decision making process and incorporating the public’s preferences are critical if we are to develop effective strategies for mitigating climate change. However, these types of decisions are especially complex, foreign and value-laden, and when asked to participate people struggle making choices that are consistent with and account for their most important concerns and objectives. This dissertation investigates how the application of structured decision-making (SDM) may increase the internal consistency of people’s choices (the degree to which those choices align with people’s values, concerns and objectives) and helps them to create real, resource-constrained, regional-scale, climate-energy strategies. The first study examines three preference elicitation methods, two that are specific to SDM, and assesses whether these methods result in internally consistent results. Based on this work, and decades of behavioral decision research that shows individuals often make intuitive, affective evaluations, neglect values and construct preferences in especially complex or foreign decision-making contexts, an SDM framework was developed along with an interactive energy system model that allowed participants to construct their own alternative energy portfolios. This framework was successfully deployed at Michigan State University in 2012 and resulted in significantly more knowledgeable participants regarding coupled climate-energy systems—particularly when participants built their own portfolios, as well as high self-reported satisfaction and low difficulty engaging with the framework. Despite these positive results, this manner of energy strategy development is considered by some to be too cognitively demanding and expensive in terms of cost, time and technical expertise to deploy quickly and incorporate large numbers of stakeholders. Thus an additional framework was developed to examine these arguments. It was deployed online, across a much larger sample and for the first time in SDM entirely lacking active facilitation. The framework returned similarly high knowledge gains and high self-reported levels of satisfaction. Internal consistency, based on an empirical measure, was found to be lower than expected and desired across both frameworks; however, these levels of consistency were similar to those found in the initial study of elicitation methods, as well as previous research, and are shown to respond positively to the decision-aiding techniques described here.
Vorschau auf Heft 9 / Impressum
Creators: name: Redaktion, Die
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Hierarchical Bayesian estimation of inequality measures with nonrectangular censored survey data with an application to wealth distribution of French households
Creators: name: Gautier, Eric
Publisher: name: arXiv
Year: 2011
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: We consider the estimation of wealth inequality measures with their confidence interval, based on survey data with interval censoring. We rely on a Bayesian hierarchical model. It consists of a model where, due to survey sampling and unit nonresponse, the summaries of the wealth distribution of households are observed with error; a mixture of multivariate models for the wealth components where groups correspond to portfolios of assets; and a prior on the parameters. A Gibbs sampler is used for numerical purposes to do the inference. We apply this strategy to the French 2004 Wealth Survey. In order to alleviate the nonresponse, the amounts were systematically collected in the form of brackets. Matched administrative data on the liability of the respondents for wealth tax and response to overview questions are used to better localize the wealth components. It implies nonrectangular multidimensional censoring. The variance of the error term in the model for the population inequality measures is obtained using linearization and taking into account the complex sampling design and the various weight adjustments.
description: Published in at http://dx.doi.org/10.1214/10-AOAS443 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Martin Fitzenreiter
Creators: name: Redaktion, Die
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Auf den Spuren der Meroitischen Kultur
Creators: name: Hintze, Ursula
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Effect of both Z and Z'-mediated flavor-changing neutral currents on the baryonic rare decay $lambda_b$ decays into $lambda l^+l^- $
Creators: name: Sahoo, S.
name: Das, C. K.
name: Maharana, L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the effect of both Z and Z'-mediated flavor-changing neutral currents (FCNCs) on the $ lambda_b arrow lambda l^+l^- (l = mu, tau) $ rare decay. We find the branching ratio is reasonably enhanced from its standard model value due to the effect of both Z and Z'-mediated FCNCs, and gives the possibility of new physics beyond the standard model. The contribution of Z'-boson depends upon the precise value of the mass of Z' boson.
description: 14 pages
Extracting electronic many-body correlations from local measurements with artificial neural networks
Creators: name: Aikebaier, Faluke
name: Ojanen, Teemu
name: Lado, Jose L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The characterization of many-body correlations provides a powerful tool for analyzing correlated quantum materials. However, experimental extraction of quantum entanglement in correlated electronic systems remains an open problem in practice. In particular, the correlation entropy quantifies the strength of quantum correlations in interacting electronic systems, yet it requires measuring all the single-particle correlators of a macroscopic sample. To circumvent this bottleneck, we introduce a strategy to obtain the correlation entropy of electronic systems solely from a set of local measurements. We demonstrate that by combining local particle-particle and density-density correlations with a neural-network algorithm, the correlation entropy can be predicted accurately. Specifically, we show that for a generalized interacting fermionic model, our algorithm yields an accurate prediction of the correlation entropy from a set of noisy local correlators. Our work demonstrates that the correlation entropy in interacting electron systems can be reconstructed from local measurements, providing a starting point to experimentally extract many-body correlations with local probes.
description: 13 pages, 3 figures
Heavy quark diffusion coefficient with gradient flow
Creators: name: Brambilla, Nora
name: Leino, Viljami
name: Mayer-Steudte, Julian
name: Petreczky, Peter
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate chromo-electric and chromo-magnetic correlators in quenched QCD at $1.5T_c$ and $10^4 T_c$ with the aim to estimate the heavy quark diffusion coefficient at leading order in the inverse heavy quark mass expansion, $κ_E$, as well as the coefficient of first mass suppressed correction, $κ_B$. We use gradient flow for noise reduction. At $1.5T_c$ we obtain: $1.70 \le κ_E/T^3 \le 3.12$ and $1.03< κ_B/T^3 < 2.61$. The latter implies that the mass suppressed effects in the heavy quark diffusion coefficient are 20% for bottom quarks and 34% for charm quark at this temperature.
description: 18 pages, 20 figures, updated to match the published version
Wall-liquid and wall-crystal interfacial free energies via thermodynamic integration: A molecular dynamics simulation study
Creators: name: Benjamin, Ronald
name: Horbach, Jürgen
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A method is proposed to compute the interfacial free energy of a Lennard-Jones system in contact with a structured wall by molecular dynamics simulation. Both the bulk liquid and bulk face-centered-cubic crystal phase along the (111) orientation are considered. Our approach is based on a thermodynamic integration scheme where first the bulk Lennard-Jones system is reversibly transformed to a state where it interacts with a structureless flat wall. In a second step, the flat structureless wall is reversibly transformed into an atomistic wall with crystalline structure. The dependence of the interfacial free energy on various parameters such as the wall potential, the density and orientation of the wall is investigated. The conditions are indicated under which a Lennard-Jones crystal partially wets a flat wall.
description: 15 pages, 11 figures
Report on The Musawwarat Pottery, 1997
Creators: name: Edwards, David
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Utilizing Human Cognitive Abilities in User Identification and CAPTCHA
Creators: name: Galib, Asadullah Al
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Computer Science
subject: Authentication
subject: Captcha
subject: Security
subject: Biometrics

description: Secure authentication is necessary for everyday applications, such as logging in to a personal computer, making a financial transaction or boarding an aircraft. We present a novel approach to user authentication in which biometric data related to human cognitive processes, in particular visual search, working memory and priming effect on automatic processing, are captured and used to identify users. Our proposed system uses a carefully designed Cognitive Task (CT) that is presented to the user as a game, in order to capture a “cognitive signature” of the user. Our empirical results support the hypothesis that the captured cognitive signatures can identify users across different platforms. Our system provides a proof-of-concept for cognitive-based biometric authentication. We validate the robustness of our system against impersonation attack by experienced users, and show that it is hard to reproduce the cognitive signature by mimicking users' gameplay. Ensuring that the access to a system is performed only by a human rather than a computer program or bot is another important security concern in online services. We propose a new approach to Captcha which estimates human cognitive ability, in particular visual search ability, to differentiate humans from computers. We refer to this Captcha as Movtcha (Matching Objects by Visual Search To Tell Computers and Humans Apart). The design of Movtcha takes into account the analysis of human behavior to minimize noise during cognitive feature estimation. Our empirical results suggest that Movtcha can provide accuracy and usability comparable to other established Captchas. We show that Movtcha is resistant against random, automated, inference and static relay attacks. Our system is suitable for large scale applications since image selection, challenge generation and response evaluation are automated. Movtcha surpasses language and experience barriers by presenting both challenge and response in clear form and therefore can be used by people all across the world.
Boden- und Landschaftsentwicklung im Gebiet der Tempel von Musawwarat es Sufra/Nordsudan
Creators: name: Schmidt, Rolf
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Daphnias: from the individual based model to the large population equation
Creators: name: Metz, J. A. J.
name: Tran, Viet Chi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: The class of deterministic 'Daphnia' models treated by Diekmann et al. (J Math Biol 61: 277-318, 2010) has a long history going back to Nisbet and Gurney (Theor Pop Biol 23: 114-135, 1983) and Diekmann et al. (Nieuw Archief voor Wiskunde 4: 82-109, 1984). In this note, we formulate the individual based models (IBM) supposedly underlying those deterministic models. The models treat the interaction between a general size-structured consumer population ('Daphnia') and an unstructured resource ('algae'). The discrete, size and age-structured Daphnia population changes through births and deaths of its individuals and throught their aging and growth. The birth and death rates depend on the sizes of the individuals and on the concentration of the algae. The latter is supposed to be a continuous variable with a deterministic dynamics that depends on the Daphnia population. In this model setting we prove that when the Daphnia population is large, the stochastic differential equation describing the IBM can be approximated by the delay equation featured in (Diekmann et al., l.c.).
Enhanced stereo vision SLAM for outdoor heavy machine rotation sensing
Creators: name: Lin, Li-Heng
Publisher: name: University of British Columbia
Year: 2010

description: The thesis presents an enhanced stereo vision Simultaneous Localization and Mapping (SLAM) algorithm that permits reliable camera pose estimation in the presence of directional sunlight illumination causing shadows and non-uniform scene lighting. The algorithm has been developed to measure a mining rope shovel's rotation angle about its vertical axis ("swing" axis). A stereo camera is mounted externally to the shovel house (upper revolvable portion of the shovel), with a clear view of the shovel's lower carbody. As the shovel house swings, the camera revolves with the shovel house in a circular orbit, seeing differing views of the carbody top. While the shovel swings, the algorithm records observed 3D features on the carbody as landmarks, and incrementally builds a 3D map of the landmarks as the camera revolves around the carbody. At the same time, the algorithm localizes the camera with respect to this map. The estimated camera position is in turn used to calculate the shovel swing angle. The algorithm enhancements include a "Locally Maximal" Harris corner selection method which allows for more consistent feature selection in the presence of directional sunlight causing shadows and non-uniform scene lighting. Another enhancement is the use of 3D "Feature Cluster" landmarks rather than single feature landmarks, which improves the robustness of the landmark matching and reduces the SLAM filter's computational cost. The vision-based sensor's maximum swing angle error is less than +/- 1 degree upon map convergence. Results demonstrate the improvements of using the novel techniques compared to past methods.
Feine meroitische Ware aus Musawwarat es Sufra
Creators: name: Seiler, Anne
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Adiabatic regularization and preferred vacuum state for the $λϕ^4$ field theory in cosmological spacetimes
Creators: name: Ferreiro, Antonio
name: Pla, Silvia
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We extend the method of adiabatic regularization by introducing an arbitrary parameter $μ$ for a scalar field with quartic self-coupling in a Friedmann-Lemaître-Robertson-Walker (FLRW) spacetime at one-loop order. The subtraction terms constructed from this extended version allow us to define a preferred vacuum state at a fixed time $η= η_0$ for this theory. We compute this vacuum state for two commonly used background fields in cosmology. We also give a possible prescription for an adequate value for $μ$.
Bericht über die Sandräumarbeiten in der ersten Hauptkampagne
Creators: name: Gerullat, Ines
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Beobachtungen zu Pfostenlöchern auf dem Säulenbankett des Zentraltempels der großen Anlage
Creators: name: Lohwasser, Angelika
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Genericity of Fréchet smooth spaces
Creators: name: Kurka, Ondřej
Publisher: name: arXiv
Year: 2011
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: (Primary) 46B04, 46B20 (Secondary) 46B15, 54H05

description: If a separable Banach space contains an isometric copy of every separable reflexive Fréchet smooth Banach space, then it contains an isometric copy of every separable Banach space. The same conclusion holds if we consider separable Banach spaces with Fréchet smooth dual space. This improves a result of G. Godefroy and N. J. Kalton.
description: 34 pages
Feldarbeiten des Seminars für Sudanarchäologie und Ägyptologie der Humboldt-Universität in Musawwarat es Sufra
Creators: name: Wenig, Steffen
name: Wolf, Pawel
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
'Flow & Jam' of frictional athermal systems under shear stress
Creators: name: Pastore, Raffaele
name: Ciamarra, Massimo Pica
name: Coniglio, Antonio
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We report recent results of molecular dynamics simulations of frictional athermal particles at constant volume fraction and constant applied shear stress, focusing on a range of control parameters where the system first flows, but then jams after a time tjam. On decreasing the volume fraction, the mean jamming time diverges, while its sample fluctuations become so large that the jamming time probability distribution P(tjam) becomes a power-law. We obtain an insight on the origin of this phenomenology focusing on the flowing regime, which is characterized by the presence of a clear correlation between the shear velocity and the mean number of contacts per particles Z, whereby small velocities occur when Z acquires higher values.
description: 10 pages, 7 figures
Long-Range Forces Between Non-Identical Black Holes With Non-BPS Extremal Limits
Creators: name: Cremonini, S.
name: Cvetic, M.
name: Pope, C. N.
name: Saha, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Motivated by recent studies of long-range forces beween identical black holes, we extend these considerations by investigating the forces between two non-identical black holes. We focus on classes of theories where charged black holes can have extremal limits that are not BPS. These theories, which live in arbitrary spacetime dimension, comprise gravity coupled to $N$ 2-form field strengths and $(N-1)$ scalar fields. In the solutions we consider, each field strength carries an electric charge. The black hole solutions are governed by the $SL(N+1,R)$ Toda equations. In four dimensions the black-hole solutions in the $SL(3,R)$ example are equivalent to the "Kaluza-Klein dyons." We find that any pair of such extremal black holes that are not identical (up to overall scaling) repel one another. We also show that there can exist pairs of non-extremal, non-identical black holes which obey a zero-force condition. Finally, we find indications of similar results in the higher examples, such as $SL(4,R)$.
description: 27 pages
Quasi-normal modes, area spectra and multi-horizon spacetimes
Creators: name: Skakala, Jozef
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We suggest an interpretation for the highly damped QNM frequencies of the spherically symmetric multi-horizon spacetimes (Reissner-Nordstrom, Schwarzschild-deSitter, Reissner-Nordstrom-deSitter) following Maggiore's proposal about the link between the asymptotic QNM frequencies and the black hole thermodynamics. We show that the behavior of the asymptotic frequencies is easy to understand if one assumes that all of the horizons have the same equispaced area spectra. The QNM analysis is then consistent with the choice of the area spectra to be the one originally proposed for the black hole's horizon by Bekenstein: A=8πn (in Planck units). The interpretation of the highly damped QNM frequencies in the multi-horizon case is based on the similar grounds as in the single horizon (Schwarzschild) case, but it has some new features that are discussed in the paper.
description: 8 pages, v2: no physics changed, some references added, few sentences added in the discussion parts
Origin of neutrino masses, dark matter, leptogenesis, and inflation in a seesaw model with triplets
Creators: name: Das, Pritam
name: Khan, Najimuddin
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider a new physics model, where the Standard Model (SM) is extended by hyperchargeless $Y=0$ triplet fermions and Higgs triplet with hypercharge $Y=2$. The first two generation fermion triplets are even under the $Z_2$ transformation. In contrast, the third fermion triplet and scalar triplet are odd under the same $Z_2$ transformation. It is a unifying framework for the simultaneous explanation of neutrino mass and mixing, dark matter, baryogenesis, inflation, and reheating temperature of the Universe. The two $Z_2$ even neutral fermions explain the neutrino low energy variables, whereas the third one can serve as a viable dark matter candidate, explaining the exact relic density. The scalar triplet is coupled nonminimally to gravity and forms the inflaton. We calculate the inflationary parameters and find them consistent with the new Planck-2018 constraints. We also do the reheating analysis for the inflaton decays/annihilations to relativistic SM particles. The triplet fermions associated with $Z_2$ even sector can provide the observed baryon asymmetry of the Universe at the TeV scale.
description: 35 pages, 8 figures
The WiggleZ Dark Energy Survey: constraining the evolution of Newton's constant using the growth rate of structure
Creators: name: Nesseris, Savvas
name: Blake, Chris
name: Davis, Tamara
name: Parkinson, David
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We constrain the evolution of Newton's constant using the growth rate of large-scale structure measured by the WiggleZ Dark Energy Survey in the redshift range $0.1 < z < 0.9$. We use this data in two ways. Firstly we constrain the matter density of the Universe, $\omms$ (assuming General Relativity), and use this to construct a diagnostic to detect the presence of an evolving Newton's constant. Secondly we directly measure the evolution of Newton's constant, $\Geff$, that appears in Modified Gravity theories, without assuming General Relativity to be true. The novelty of these approaches are that, contrary to other methods, they do not require knowledge of the expansion history of the Universe, $H(z)$, making them model independent tests. Our constraints for the second derivative of Newton's constant at the present day, assuming it is slowly evolving as suggested by Big Bang Nucleosynthesis constraints, using the WiggleZ data is $\ddotGeff(t_0)=-1.19\pm 0.95\cdot 10^{-20}h^2 \textrm{yr}^{-2}$, where $h$ is defined via $H_0=100 h km s^{-1}Mpc^{-1}$, while using both the WiggleZ and the Sloan Digital Sky Survey Luminous Red Galaxy (SDSS LRG) data is $\ddotGeff(t_0)=-3.6\pm 6.8\cdot 10^{-21}h^2 \rm{yr}^{-2}$, both being consistent with General Relativity. Finally, our constraint for the rms mass fluctuation $σ_8$ using the WiggleZ data is $σ_8=0.75 \pm 0.08$, while using both the WiggleZ and the SDSS LRG data $σ_8=0.77 \pm 0.07$, both in good agreement with the latest measurements from the Cosmic Microwave Background radiation.
description: 15 pages, 5 figures, 4 tables, changes match the published version
Meroe – Eritrea – Musawwarat – und der Kampf um den Erhalt der Sudanarchäologie
Creators: name: Dallibor, Klaus
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
THE IMPACT OF FORMATIVE ASSESSMENT STRATEGY ON INCREASING STUDENT MOTIVATION IN ENGLISH CLASSES
Creators: name: Sodikova, Yulduz
Publisher: name: Zenodo
Year: 2023

description: The main goal of this article is to introduce various forms of formative assessment, and through data collection and interpretation, to draw certain conclusions about their impact on increasing students' motivation in learning a foreign language and to draw conclusions that will help in determining further didactic and methodological strategies in English lessons. Formative assessment helps to obtain information about the degree to which each student has mastered the educational material, and promptly identifies shortcomings and gaps in students' knowledge.
Fast Identification of Biological Pathways Associated with a Quantitative Trait Using Group Lasso with Overlaps
Creators: name: Silver, Matt
name: Montana, Giovanni
Publisher: name: arXiv
Year: 2012
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Where causal SNPs (single nucleotide polymorphisms) tend to accumulate within biological pathways, the incorporation of prior pathways information into a statistical model is expected to increase the power to detect true associations in a genetic association study. Most existing pathways-based methods rely on marginal SNP statistics and do not fully exploit the dependence patterns among SNPs within pathways. We use a sparse regression model, with SNPs grouped into pathways, to identify causal pathways associated with a quantitative trait. Notable features of our "pathways group lasso with adaptive weights" (P-GLAW) algorithm include the incorporation of all pathways in a single regression model, an adaptive pathway weighting procedure that accounts for factors biasing pathway selection, and the use of a bootstrap sampling procedure for the ranking of important pathways. P-GLAW takes account of the presence of overlapping pathways and uses a novel combination of techniques to optimise model estimation, making it fast to run, even on whole genome datasets. In a comparison study with an alternative pathways method based on univariate SNP statistics, our method demonstrates high sensitivity and specificity for the detection of important pathways, showing the greatest relative gains in performance where marginal SNP effect sizes are small.
description: 29 pages
Erfahrungsbericht mit Online-Formaten im Forschungsdatenmanagement (vor und während der Pandemie). Covid-19 und das Forschungsdatenmanagement - eine Reflektion.
Creators: name: Strauch, Annette
Publisher: name: Zenodo
Year: 2020
Subjects: UB
eResearch
eScience
RDM training
Research Data
Research Data Management
Digital Turn

description: Erfahrungen mit digitalen Lehrräumen im Forschungsdatenmanagement. Train the Researcher (Corona und die Forschung).
Exploiting Interference in Wireless Networks
Creators: name: Mollanoori Shamsi, Mohsen
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Computer Science
subject: Wireless Networks
subject: successive interference cancellation
subject: physical-layer network coding

description: Traditionally, interference in wireless networks is considered a destructive phenomenon and treated as random noise. If multiple packets are transmitted simultaneously on the same channel, the assumption is that these packets collide and therefore all of the overlapping packets need to be retransmitted. As a consequence, to reduce interference, MAC protocols are typically designed to schedule a single transmission at a time on a channel. In contrast, modern decoding techniques such as successive interference cancellation (SIC) and physical-layer network coding (PNC) aim to extract information from overlapping signals by exploiting the additive nature of electromagnetic waves. The resulting structure at the physical layer transforms interference into a potential advantage. Higher-layer protocols, however, need to be redesigned to make optimal use of this structure. The goal of this thesis is to develop new higher-layer protocols or adapt existing protocols to optimally use the advanced decoding techniques available at the physical layer. Special focus is on the MAC layer. The main body of the thesis is about designing protocols over a SIC-capable physical layer, but in one of the chapters, it is assumed that the physical layer is also capable of doing PNC. The effect of SIC over several types of networks, namely, networks with centralized scheduling with certain goals (such as maximum throughput scheduling and proportional fair scheduling), random access (i.e., ALOHA like) networks and networks with linear coding capability are studied.
Tight bounds and the role of optical loss in polariton-mediated near-field heat transfer
Creators: name: Pascale, Mariano
name: Papadakis, Georgia T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We introduce an analytical framework for near-field radiative heat transfer in bulk plasmonic and polar media. Considering material dispersion, we derive a closed-form expression for the radiative thermal conductance, which disentangles the role of optical loss from other material dispersion characteristics, such as the spectral width of the Reststrahlen band in polar dielectrics, as well as from the temperature. We provide a universal condition for maximizing heat transfer that defines the optimal interplay between a material's optical loss and polariton resonance frequency, based on which we introduce tight bounds to near-field heat transfer. With this formalism, one can quantitatively evaluate all polaritonic materials in terms of their performance as near-field thermal emitters.
Bericht über die konservatorischen Arbeiten in Musawwarat es Sufra
Creators: name: Wolf, Pawel
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2023

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Bd. 8 (1998): Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.