cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Closed Timelike Curves Induced by a Buchdahl-inspired Vacuum Spacetime in $R^2$ Gravity
Creators: name: Nguyen, Hoang Ky
name: Lobo, Francisco S. N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The recently obtained $\textit{special}$ Buchdahl-inspired metric [Phys. Rev. D 107, 104008 (2023)] describes asymptotically flat spacetimes in pure Ricci-squared gravity. The metric depends on a new (Buchdahl) parameter $\tilde{k}$ of higher-derivative characteristic, and reduces to the Schwarzschild metric, for $\tilde{k}=0$. For the case $\tilde{k}\in(-1,0)$, it was shown that it describes a traversable Morris-Thorne-Buchdahl (MTB) wormhole [Eur. Phys. J. C 83, 626 (2023)], where the weak energy condition is formally violated. In this paper, we briefly review the $\textit{special}$ Buchdahl-inspired metric, with focuses on the construction of $ζ-$Kruskal-Szekeres (KS) diagram and the situation for a wormhole to emerge. Interestingly, the MTB wormhole structure appears to permit the formation of closed timelike curves (CTCs). More specifically, a CTC straddles the throat, comprising of two segments positioned in opposite quadrants of the $ζ-$KS diagram. The closed timelike loop thus passes through the wormhole throat twice, causing $\textit{two}$ reversals in the time direction experienced by the (timelike) traveller on the CTC. The key to constructing a CTC lies in identifying any given pair of antipodal points $(T,X)$ and $(-T,-X)$ $\textit{on the wormhole throat}$ in the $ζ-$KS diagram as corresponding to the same spacetime event. It is interesting to note that the Campanelli-Lousto metric in Brans-Dicke gravity is known to support two-way traversable wormholes, and the formation of the CTCs presented herein is equally applicable to the Campanelli-Lousto solution.
description: Invited contribution to Special Issue "The Physics of Time Travel" (www.mdpi.com/journal/universe/special_issues/Physics_Time_Travel)
Experimental realization of a Szilard engine with a single electron
Creators: name: Koski, J. V.
name: Maisi, V. F.
name: Pekola, J. P.
name: Averin, D. V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The most succinct manifestation of the second law of thermodynamics is the limitation the Landauer principle imposes on the amount of heat a Maxwell demon (MD) can convert into free energy per single bit of information obtained in a measurement. We suggest and experimentally realize a reversible electronic MD based on a single-electron box operated as a Szilard engine, providing the first demonstration of this limitation: extraction of kT ln 2 of heat from the reservoir at temperature T per one bit of created information. The information is encoded in the position of an extra electron in the box.
description: Main text 5 pages, 3 figures, supplementary material 2 pages, 3 figures
The multilevel four-stroke swap engine and its environment
Creators: name: Uzdin, Raam
name: Kosloff, Ronnie
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A multilevel four-stroke engine where the thermalization stokes are generated by unitary collisions with bath particles is analyzed. Our model is solvable even when the engine operates far from thermal equilibrium and in the strong system-bath coupling. Necessary operation conditions for the heat machine to perform as an engine or a refrigerator are derived. We relate the work and efficiency of the device to local and non-local statistical properties of the baths (purity, mutual coincidence etc.). In particular, we relate the Clausius inequality to the symmetrized relative entropy of the baths (Jefferys divergence). Other Clausius-like inequalities are derived as well. Finally, in the ultra-hot regime we optimize the work of the multilevel engine and obtain simpler forms for the work and efficiency.
Free nested cumulants and an analogue of a formula of Brillinger
Creators: name: Lehner, Franz
Publisher: name: arXiv
Year: 2013
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: Primary: 46L54, Secondary: 05A18

description: We prove a free analogue of Brillinger's formula (sometimes called "law of total cumulance") which expresses classical cumulants in terms of conditioned cumulants. As expected, the formula is obtained by replacing the lattice of set partitions by the lattice of noncrossing set partitions and using and an appropriate notion of noncommutative nested products. As an application we reprove a characterization of freeness due to Nica, Shlyakhtenko and Speicher by Möbius inversion techniques, without recourse to the Fock space model for free random variables.
description: arXiv admin note: text overlap with arXiv:math/0409025
Exact Recovery and Bregman Hard Clustering of Node-Attributed Stochastic Block Model
Creators: name: Dreveton, Maximilien
name: Fernandes, Felipe S.
name: Figueiredo, Daniel R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: 62H30, 62F12

description: Network clustering tackles the problem of identifying sets of nodes (communities) that have similar connection patterns. However, in many scenarios, nodes also have attributes that are correlated with the clustering structure. Thus, network information (edges) and node information (attributes) can be jointly leveraged to design high-performance clustering algorithms. Under a general model for the network and node attributes, this work establishes an information-theoretic criterion for the exact recovery of community labels and characterizes a phase transition determined by the Chernoff-Hellinger divergence of the model. The criterion shows how network and attribute information can be exchanged in order to have exact recovery (e.g., more reliable network information requires less reliable attribute information). This work also presents an iterative clustering algorithm that maximizes the joint likelihood, assuming that the probability distribution of network interactions and node attributes belong to exponential families. This covers a broad range of possible interactions (e.g., edges with weights) and attributes (e.g., non-Gaussian models), as well as sparse networks, while also exploring the connection between exponential families and Bregman divergences. Extensive numerical experiments using synthetic data indicate that the proposed algorithm outperforms classic algorithms that leverage only network or only attribute information as well as state-of-the-art algorithms that also leverage both sources of information. The contributions of this work provide insights into the fundamental limits and practical techniques for inferring community labels on node-attributed networks.
The influence of personal and environmental factors on business start-ups: A case study in the district of Dili and Oecusse, Timor-Leste
Creators: name: Ximenes, Tarcisio
Publisher: name: University of the Thai Chamber of Commerce
Year: 2018
Subjects: Entrepreneurship
Small businesses
Entrepreneur
business start-ups
Economics
start-up motivation
demographics
personal traits
environmental determinants

description: UTCC International Journal of Business and Economics, 10, 1, 37-52
Metrics for BPEL Process Reusability Analysis in a Workflow System
Creators: name: Khoshkbarforoushha, A.
name: Jamshidi, P.
name: Fahmideh, M.
name: Wang, L.
name: Ranjan, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: This work proposes a quantitative metric to analyze potential reusability of a BPEL (Business Process Execution Language) Process. The approach is based on Description and Logic Mismatch Probability of a BPEL Process that will be reused within potential contexts. The mismatch probabilities have been consolidated to a metric formula for quantifying the probability of potential reuse of BPEL processes. An initial empirical evaluation suggests that the proposed metric properly predict potential reusability of BPEL processes. According to the experiment, there exists a significant statistical correlation between results of the metric and the experts judgements. This indicates a predictive dependency between the proposed metric and potential reusability of BPEL processes as a measuring stick for this phenomena. If future studies ascertain these findings by replicating this experiment, the practical implications of such a metric are early detection of the design flaws and aiding architects to judge various design alternatives.
description: This the extended version of the conference paper that Published in: WETSoM '10 Proceedings of the 2010 ICSE Workshop on Emerging Trends in Software Metrics Pages 67-74, ACM New York, NY, USA \c{opyright}2010
A Senge's model on the practical domain for developing team learning skills
Creators: name: Ravee Phoewhawm
Publisher: name: University of the Thai Chamber of Commerce
Year: 2018
Subjects: Assessment
Collaboration
Dialogue
Experimenting
Innovation
Performance
Practice
Rehearsing
Reflecting
Team Learning

description: UTCC International Journal of Business and Economics, 10, 1, 75-94
Exploring the relationship between the big five personality traits and exhibition shows attendance
Creators: name: Xiameng Wu
Publisher: name: University of the Thai Chamber of Commerce
Year: 2018
Subjects: Exhibition shows
Exhibition attendance
attendees' behaviors
Personality
Extraversion
Agreeableness
Conscientiousness
Neuroticism
Openness to experience

description: UTCC International Journal of Business and Economics, 10, 1, 95-118
Flower Pollination Algorithm for Global Optimization
Creators: name: Yang, Xin-She
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Flower pollination is an intriguing process in the natural world. Its evolutionary characteristics can be used to design new optimization algorithms. In this paper, we propose a new algorithm, namely, flower pollination algorithm, inspired by the pollination process of flowers. We first use ten test functions to validate the new algorithm, and compare its performance with genetic algorithms and particle swarm optimization. Our simulation results show the flower algorithm is more efficient than both GA and PSO. We also use the flower algorithm to solve a nonlinear design benchmark, which shows the convergence rate is almost exponential.
description: 10 pages
Shelving and Probe Efficiency in Trapped Ion Experiments
Creators: name: Schacht, M.
name: Schauer, M. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A generalized probe sequence typical of trapped ion experiments using shelving is studied. Detection efficiency is analyzed for finite shelved state lifetimes and using multi-modal count distributions. Multi-modal distributions are more appropriate for measurements that use a small number of ions than the simple Poisson counting statistics usually considered and have a larger variance that may be significant in determining uncertainties and in making weighted fits. Optimal probe times and the resulting state detection efficiency and sensitivity are determined for arbitrary cooling rates, initial states and shelved state lifetimes, in terms of a probe coherence time τp. A universal optimal probe time of tp ~ 0.43τp is shown to give an almost optimal probe sensitivity for most systems.
Unveiling the unconventional optical signatures of regular black holes within accretion disk
Creators: name: Guo, Sen
name: Huang, Yu-Xiang
name: Cui, Yu-Hao
name: Han, Yan
name: Jiang, Qing-Quan
name: Liang, En-Wei
name: Lin, Kai
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The optical characteristics of three types of black holes (BHs) surrounded by a thin accretion disk are discussed, namely the Schwarzschild BH, Bardeen BH, and Hayward BH. We calculate the deflection angle of light as it traverses the vicinity of each BH using numerical integration and semi-analytical methods, revealing that both approaches can effectively elucidate the deflection of light around the BH. We investigate the optical appearance of the accretion disk and its corresponding observational images at various viewing angles, discovering that the luminosity in the region near the BH on the inner side of the accretion disk is higher than that on the outer side owing to higher material density in closer proximity to the BH. We observe a significant accumulation of brightness on the left side of the accretion disk, attributed to the motion of matter and geometric effects. Our findings emphasize the significant influence of the observation inclination angle on the observed outcomes. An increase in the observation inclination angle results in the separation of higher-order images. With the improvement in EHT observation accuracy, we believe that the feature of a minimal distance between the innermost region of the direct image of the Hayward BH and the outermost region of the secondary image can be used as an indicator for identifying Hayward BHs.
description: 27 pages, 10 figures
MPEC 2023-F74 : 2023 FX1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 FX1

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Factors Affecting Public Procurement Performance in Ethiopia: The Case of Public Procurement and Property Disposal Services
Creators: name: Abebe Aberu
Publisher: name: Zenodo
Year: 2017

description: This research aims to examine factors affecting public procurement performance in Ethiopia: the case of Public Procurement and Property Disposal Services. Based on literature reviews, the researcher identified four factors that affect the procurement performance. These includes: procurement planning, unethical practices, competency of staff, procurement procedure and Information Communication Technology on procurement. The hypothesis of the study was the procurement factors (independent variables) affect the procurement performance (dependent variable) of PPPDS. The research design is made based on descriptive and explanatory research approaches. The researcher distributed 116 questionnaires and 97 were filled and returned. Both primary and secondary data were used throughout this research. For primary data, both structured and semi structured type questionnaires were prepared. The results of this study indicate that the independent variables (Procurement Planning, Competency of Staff, Procurement Procedure and Information Communication Technology) positively affect the dependent variable (procurement performance) to a significant extent. These factors explain 85.9% of procurement performance, while the rest 14.1% is explained by other factors which are not subject of this study.
Single Photon Transistor Mediated by Inter-State Rydberg Interaction
Creators: name: Gorniaczyk, Hannes
name: Tresp, Christoph
name: Schmidt, Johannes
name: Fedder, Helmut
name: Hofferberth, Sebastian
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on the realization of an all-optical transistor by mapping gate and source photons into strongly interacting Rydberg excitations with different principal quantum numbers in an ultracold atomic ensemble. We obtain a record switch contrast of 40 % for a coherent gate input with mean photon number one and demonstrate attenuation of source transmission by over 10 photons with a single gate photon. We use our optical transistor to demonstrate the nondestructive detection of a single Rydberg atom with a fidelity of 0.72(4).
description: Submitted to Physical Review Letters on March 27, 2014
Can a millicharged dark matter particle emit an observable gamma-ray line?
Creators: name: Aisati, Chaïmae El
name: Hambye, Thomas
name: Scarna, Tiziana
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: If a gamma-ray line is observed in the near future, it will be important to determine what kind of dark matter (DM) particle could be at its origin. We investigate the possibility that the gamma-ray line would be induced by a slow DM particle decay associated to the fact that the DM particle would not be absolutely neutral. A "millicharge" for the DM particle can be induced in various ways, in particular from a kinetic mixing interaction or through the Stueckelberg mechanism. We show that such a scenario could lead in specific cases to an observable gamma-ray line. This possibility can be considered in a systematic model-independent way, by writing down the corresponding effective theory. This allows for a multi-channel analysis, giving in particular upper bounds on the intensity of the associated gamma-ray line from cosmic rays emission. Our analysis includes the possibility that in the two-body decay the photon is accompanied with a neutrino. We show that, given the stringent constraints which hold on the millicharge of the neutrinos, this is not an option, except if the DM particle mass lies in the very light KeV-MeV range, allowing for a possibility of explanation of the recently claimed, yet to be confirmed, ~3.5KeV X-ray line.
description: 10 pages, references and one figure presenting the bounds holding on the dark charge in the kinetic mixing case added
Aperture Array Configurations for SKA1 Core
Creators: name: Grainge, Keith
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: This memo considers some aspects of the configuration of the SKA1 Low Frequency Aperture Array, both at the element and station level. At the element level I propose a possible scenario for forming station beams where elements are shared between stations and apodisation is implemented, with the aim of improving filling factor, overall sensitivity and sidelobe performance; the disadvantages of such a scheme with regards to beam former requirements and shortest available baseline are also discussed. At the station level, a randomised configuration within a filled central region together with spiral arms is explored.
Scientific Abstracts from the 45th Scand-LAS Annual Meeting and Educational Days
Creators: name: Voipio, H-M
name: Jaakkola, U-M
name: Kemppinen, N
Publisher: name: Scandinavian Journal of Laboratory Animal Sciences
Year: 2016

description: Turku, Finland 9-12 June 2015
description: Scandinavian Journal of Laboratory Animal Sciences, Vol. 42 (2016)
Limit Laws for Extremes of Dependent Stationary Gaussian Arrays
Creators: name: Hashorva, E.
name: Weng, Z.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: In this paper we show that the componentwise maxima ofweakly dependent bivariate stationary Gaussian triangular arrays converge in distribution after normalisation to Hüsler-Reiss distribution. Under a strong dependence assumption, we prove that the limit distribution of the maxima is a mixture of a bivariate Gaussian distribution and Hüsler-Reiss distribution. Another finding of our paper is that the componentwise maxima and componentwise minima remain asymptotically independent even in the settings of Hüsler and Reiss (1989) allowing further for weak dependence. Further we derive an almost sure limit theorem under the Berman condition for the components of the triangular array.
description: A typo in Assumption A2 has been removed
Unifying "soft" and "hard" diffractive exclusive vector meson production and deeply virtual Compton scattering
Creators: name: Fazio, S.
name: Fiore, R.
name: Jenkovszky, L.
name: Salii, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A Pomeron model applicable to both "`soft" and "hard" processes is suggested and tested against the high-energy data from virtual photon-induced reactions. The Pomeron is universal, containing two terms, a "soft" and a "hard" one, whose relative weight varies with $\widetilde {Q^2}=Q^2+M_V^2$, where $Q^2$ is the virtuality of the incoming photon and $M_V$ is the mass of the produced vector particle. With a small number of adjustable parameters, the model fits all available data on vector meson production and deeply virtual Compton scattering from HERA. Furthermore, we attempt to apply the model to hadron-induced reactions, by using high-energy data from proton-proton scattering.
Nonlinear simulations to optimize magnetic nanoparticle hyperthermia
Creators: name: Reeves, Daniel B.
name: Weaver, John B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magnetic nanoparticle hyperthermia is an attractive emerging cancer treatment, but the acting microscopic energy deposition mechanisms are not well understood and optimization suffers. We describe several approximate forms for the characteristic time of Néel rotations with varying properties and external influences. We then present stochastic simulations that show agreement between the approximate expressions and the micromagnetic model. The simulations show nonlinear imaginary responses and associated relaxational hysteresis due to the field and frequency dependencies of the magnetization. This suggests efficient heating is possible by matching fields to particles instead of resorting to maximizing the power of the applied magnetic fields.
description: 4 pages, 4 figures
Who is a compatible partner for a male mouse?
Creators: name: Ewaldsson, B
name: Nunes, SF
name: Gaskill, B
name: Ferm, A
name: Stenberg, A
name: Pettersson, M
name: Kastenmayer, RJ
Publisher: name: Scandinavian Journal of Laboratory Animal Sciences
Year: 2016

description: The complex issue of social housing of laboratory mice was addressed by studying the housing compatibility of male mice with castrated males, or with ovariectomized females, for a period of up to seven weeks. Sexually mature males were shown to be socially incompatible with castrated males of the same age but to be more compatible with same age or older ovariectomized females (results varied according to the mouse strains used). These ovariectomized females could also be repeatedly housed with different sets of younger male mice, even after being briefly separated and again re-paired. Our data suggest that ovariectomized females could be used to establish a long-term companion group fully compatible for male mice group housing.
description: Scandinavian Journal of Laboratory Animal Sciences, Vol. 42 (2016)
Better Software, Better Data Handling
Creators: name: Sufi, Shoaib
Publisher: name: Zenodo
Year: 2020
Subjects: spreadsheets, data handling, software, skills, python, training, community, infrastructure, FAIR, Open Research, Reproducibility

description: Software practices, skills and training have become an essential part of the toolkit of any researcher who deals with data. In this webinar, we cover how better software skills help you become better at data handling and what support is out there to improve your practice. The webinar is focused on an ECR audience. The topics we cover are: How does software relate to data handling skills How can you improve your software and data handling skills What training is available How do you get more proficient What are some good resources to know about Further information at - https://codata.org/initiatives/strategic-programme/codata-connect/webinar-series-research-skills/webinar-7-better-software-better-data-handling/
High-contrast imaging in polychromatic light with the self-coherent camera
Creators: name: Mazoyer, Johan
name: Baudoz, Pierre
name: Galicher, Raphaël
name: Rousset, Gérard
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Context. In the context of direct imaging of exoplanets, coronagraphs are commonly proposed to reach the required very high contrast levels. However, wavefront aberrations induce speckles in their focal plane and limit their performance. Aims. An active correction of these wavefront aberrations using a deformable mirror upstream of the coronagraph is mandatory. These aberrations need to be calibrated and focal-plane wavefront-sensing techniques in the science channel are being developed. One of these, the self-coherent camera, of which we present the latest laboratory results. Methods. We present here an enhancement of the method: we directly minimized the complex amplitude of the speckle field in the focal plane. Laboratory tests using a four-quadrant phase-mask coronagraph and a 32x32 actuator deformable mirror were conducted in monochromatic light and in polychromatic light for different bandwidths. Results. We obtain contrast levels in the focal plane in monochromatic light better than 3.10^-8 (RMS) in the 5 - 12 λ/D region for a correction of both phase and amplitude aberrations. In narrow bands (10 nm) the contrast level is 4.10^-8 (RMS) in the same region. Conclusions. The contrast level is currently limited by the amplitude aberrations on the bench. We identified several improvements that can be implemented to enhance the performance of our optical bench in monochromatic as well as in polychromatic light.
description: 4 pages, 3 figures, accepted in Astronomy & Astrophysics (02/2014)
Supplementary Material 1
Creators: name: Ogata, Shigen Fang
name: Tawatsuji, Yoshimasa
name: Matsui, Tatsunori
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 460802
subject: Affective computing
classificationCode: 520401
subject: Cognition

description: This is the supplementary material 1 of the paper "Exploratory Research on Influences of Style-based Categorization on Affective Evaluations of Paintings" authored by Shigen Fang Ogata, Yoshimasa Tawatsuji and Tatsunori Matsui.
title: The ecology of a sex ratio distorting meiotic driver
Creators: name: Lyth, Sophie
Publisher: name: University of Liverpool Repository
Year: 2024

description: Subverting the laws of fair Mendelian inheritance, selfish genetic elements (SGEs) bias their own transmission into subsequent generations, often at the cost to the rest of the genome. These systems are common in nature and can spread rapidly to fixation due to their transmission advantage. In this thesis, I examine a particular type of SGE, X chromosome meiotic drive (XCMD), in Drosophila subobscura. XCMD manipulates gamete production in males, where selfish X chromosomes kill Y-bearing sperm during spermatogenesis, resulting in the production of only daughters. Despite the transmission advantage of these X chromosomes, many XCMD systems in nature remain at low and stable frequencies, and do not rapidly spread to fixation as expected. Indeed, the XCMD system in D. subobscura has remained at a frequency of approximately 20% in North Africa for at least 50 years. The factors that are strong enough to counteract the transmission advantage of the selfish X chromosome, however, remain poorly understood. In this thesis, I examine factors that could prevent the XCMD system in D. subobscura from rapidly spreading to fixation. I first examine the effect of extreme temperatures on individuals that carry XCMD, to investigate if this is a stabilising force of drive. There has previously been evidence of a relationship between XCMD and temperature, as many species that carry XCMD show a latitudinal cline in drive frequency. Thus, varying temperatures may prevent XCMD from spreading, but here I find extreme temperatures were not a stabilising force. I then characterise the first strong suppressor of XCMD in D. subobscura. Suppression of drive rescues Y-bearing sperm, allowing SR carrying males to produce sons. Here, I show that this suppressor is capable of restoring normal sex ratios, rather than a 100% female bias progeny that drive causes. The remaining chapters of this thesis go on to investigate the nature of the drive suppressor. In spite of the predicted selection pressure for this suppressor to spread, drive remains at intermediate frequencies and suppression against it remains rare. Motivated by this observation, I search for fitness costs that are associated with carrying this suppressor in chapters 4 and 5 as an explanation as to why it has not become fixed within populations that harbour drive. My final chapter will then investigate the strength of the suppressor to see if it is capable of restoring normal 50:50 sex ratios to populations. Using an experimental evolution approach, I investigate whether suppression against XCMD can rescue laboratory populations from extinction as a result of the presence of meiotic drive.
Ab Initio Path to Heavy Nuclei
Creators: name: Binder, Sven
name: Langhammer, Joachim
name: Calci, Angelo
name: Roth, Robert
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present the first ab initio calculations of nuclear ground states up into the domain of heavy nuclei, spanning the range from 16-O to 132-Sn based on two- plus three-nucleon interactions derived within chiral effective field theory. We employ the similarity renormalization group for preparing the Hamiltonian and use coupled-cluster theory to solve the many-body problem for nuclei with closed sub-shells. Through an analysis of theoretical uncertainties resulting from various truncations in this framework, we identify and eliminate the technical hurdles that previously inhibited the step beyond medium-mass nuclei, allowing for reliable validations of nuclear Hamiltonians in the heavy regime. Following this path we show that chiral Hamiltonians qualitatively reproduce the systematics of nuclear ground-state energies up to the neutron-rich Sn isotopes.
description: 5 pages, 5 figures
Quasi-bound states and continuum absorption background of polar Al0.5Ga0.5N/GaN quantum dots
Creators: name: Elmaghraoui, D.
name: Triki, M.
name: Leroux, S. Jaziri M.
name: Brault, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A theoretical interpretation of the photoluminescence excitation spectra of self-organized polar GaN/(Al,Ga)N quantum dots is proposed. A numerical method assuming a realistic shape of the dots and including the built-in electric field effects is developed to calculate their energy structure and hence their optical absorption. The electron and hole spectra show the existence of a set of quasi-bound states that does not originate from the wetting layer, and plays a crucial role in the observed absorption spectrum of the GaN/(Al,Ga)N dots. Transitions involving these quasi-bound states and wetting layer states give a sufficient explanation for the observed continuum absorption background. The properties of this absorption band, especially its extension, depend strongly on the dot's size. Our simulation provides a natural explanation of the experimental luminescence excitation spectra of ensembles of dots of different heights. Our theoretical model can be extended to cases where the confinement potentials are complicated by the presence of a stronger electric field.
Collision rate for suspensions at large Stokes numbers - comparing Navier-Stokes and synthetic turbulence
Creators: name: Voßkuhle, Michel
name: Pumir, Alain
name: Lévêque, Emmanuel
name: Wilkinson, Michael
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The use of simplified models of turbulent flows provides an appealing possibility to study the collision rate of turbulent suspensions, especially in conditions relevant to astrophysics, which require large time scale separations. To check the validity of such approaches, we used a direct numerical simulation (DNS) velocity field, which satisfies the Navier-Stokes equations (although it neglects the effect of the suspended particles on the flow field), and a kinematic simulation (KS) velocity field, which is a random field designed so that its statistics are in accord with the Kolmogorov theory for fully-developed turbulence. In the limit where the effects of particle inertia (characterised by the Stokes number) are negligible, the collision rates from the two approaches agree. As the Stokes number St increases, however, we show that the DNS collision rate exceeds the KS collision rate by orders of magnitude. We propose an explanation for this phenomenon and explore its consequences. We discuss the collision rate $R$ for particles in high Reynolds number flows at large Stokes number, and present evidence that $R\propto \sqrt{\rm St}$.
description: 9 pages, 3 figures
Mary, her devotees, and her miracles: can medieval miracle tales tell us about the growth of Marian devotion?
Creators: name: Strauss, Marianne Elisabeth
Publisher: name: Macquarie University
Year: 2023
Subjects: classificationCode: 430314
subject: History of religion

description: Marian miracle tales have been studied to understand aspects of medieval life in Western Europe such as childhood, Christian-Jewish relations, and the role of women. However, these miracle tales, and collections, have been under-utilised in discussions of the growth of practices of Marian devotion and the development of Marian theology in the early twelfth century. This thesis sets out to situate William of Malmesbury’s Miracles of the Blessed Virgin Mary (MBVM) among accounts of Marian devotion in twelfth-century Anglo-Norman England. To determine the role of the MBVM in the growth of Marian devotion, this thesis situates William of Malmesbury in his political and religious contexts, considering his exemplary career whilst noting how he is representative of broader trends. The MBVM’s theological sections, that is, the Prologues and the Epilogue, will be examined to show that William was engaged in attempts to grant Mary perfection, as well as to argue that she experienced a unique death as a part of his account of her Assumption. The miracle tales will be examined to show that William depicts Mary’s as an embodiment of the virtue of Justice, intervening in myriad accounts of everyday life. This thesis will also argue that the MBVM should be read as offering an integrated theological treatise whereby the theological sections and miracle tales work to inform each other. Thus, the MBVM, despite its unpopularity in William’s own time, may provide insight into the growth of Marian devotion in Anglo-Norman England by revealing the theological concerns of monks, coupled with an account of how Mary may have been viewed by her devotees.
Synthesis of p(HEMA-co-AETAC) nanocomposite hydrogel with vinyl-function montmorillonite nanoparticles and effective removal of methyl orange from aqueous solution
Creators: name: Onder, Alper
name: Kıvanç, Mehmet Rıza
name: Ilgin, Pinar
name: Ozay, Hava
name: Ozay, Ozgur
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Plant Biology

description: It has become crucial to develop new adsorbents to remove toxic dye wastes from wastewater to protect our existing aquatic ecosystem. Here, to remove methyl orange azo dye from aqueous solutions, a new p(HEMA-co-AETAC)/VMt nanocomposite hydrogel was prepared by using 2-hydroxyethyl methacrylate and [2-(acryloyloxy)ethyl]trimethylammonium chloride monomers using vinyl-based montmorillonite crosslinker. Obtained new types of crosslinker and nanocomposite hydrogels have been characterized by various analysis methods. In addition, the effects of crosslinker amount, monomer amount and pH on the swelling behavior of nanocomposite hydrogel were investigated. The effects of essential parameters such as contact time, initial dye concentration, pH effect of the solution, adsorbent amount, and temperature on adsorption were evaluated. It was determined that there was no significant change in the adsorption ability of the nanocomposite hydrogel in the pH range of 3–10. Experimental results showed that the Langmuir isotherm model fit better, and the calculated maximum adsorption capacity was 961.54 mg/g. In addition, it was determined that vinyl-based montmorillonite used as a crosslinker supported MO adsorption. p(HEMA-co-AETAC)/VMt nanocomposite hydrogel may be a new type of adsorbent to remove toxic synthetic dye residues from aqueous media. A new adsorbent for the removal of toxic synthetic dye residues from aqueous media in a wide range of pH. Hydrogels containing AETAC and HEMA are easily obtained with modified montmorillonite. The adsorption properties of the nanocomposite hydrogel were evaluated with methyl orange dye molecules. According to Langmuir isotherm, the maximum adsorption capacity was determined to be 961.54 mg/g.
Effect of the content of starch on the biocompatibility, bacterial inhibition, and drug release performance of semi-IPN collagen-polyurethane hydrogels
Creators: name: Caldera-Villalobos, M.
name: Claudio-Rizo, J. A.
name: Rodríguez-Estrada, V. A.
name: Munguía, D. A. Cabrera
name: Becerra-Rodríguez, J. J.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Physiology
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified

description: This work studied the effect of content of starch on the structure and properties of hydrogels generated by semi-interpenetrating the polysaccharide in the collagen-polyurethane matrix and generating biomaterials in the hydrogel state potentially useful in biomedicine. Starch increased the reticulation of the polymeric matrix by hydrogen bonding with the collagen fibers. The maximum swelling degree was observed for the formulation containing 40 wt.% of starch. The microstructure of these materials is semi-crystalline and the increase of the content of starch avoids the segregation of starch granules in the matrix, generating homogeneous surfaces that tend to release less glucose-rich degradation by-products and encapsulated ketorolac. Materials with low content of starch (10–20 wt.%) improve both the mechanical and thermal stability of the hydrogels and the ketorolac release performance. The matrices activated the metabolism of monocytes and fibroblasts, favoring their proliferation. The presence of starch in semi-IPN hydrogels confers high inhibition capacity of E. coli and a slow rate of hydrolytic and proteolytic degradation. The results of cell signaling for important cytokines in the wound healing process indicated that the CS20% matrix shows favorable modulation of TNF-α, MCP-1, and TGF-β secretion, so it could be successfully applied in the treatment of chronic wounds.
Two-photon echo method for observing electron Zitterbewegung in carbon nanotubes
Creators: name: Rusin, Tomasz M.
name: Zawadzki, Wlodek
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The phenomenon of Zitterbewegung (ZB, trembling motion) of electrons is described in zigzag carbon nanotubes (CNT) excited by laser pulses. The tight binding approach is used for the band structure of CNT and the effect of light is introduced by the vector potential. Contrary to the common theoretical practice, no a priori assumptions are made concerning electron wave packet, the latter is determined as a result of illumination. In order to overcome the problem of various electron phases in ZB, a method of two-photon echo is considered and described using the density function formalism. The medium polarization of CNT is calculated by computing exact solutions of the time-dependent electron Hamiltonian. The signal of two-photon echo is extracted and it is shown that, using existing parameters of CNT and laser pulses, one should be able to observe the electron trembling motion. Effects of electron decoherence and relaxation are discussed.
description: 9 pages, 4 figures
The effects of and tolerances for Carbon Dioxide in relation to recent developments in laboratory animal housing
Creators: name: Krohn, Thomas C
name: Hansen, Axel Kornerup
Publisher: name: Scandinavian Journal of Laboratory Animal Sciences
Year: 2014

description: During the last decades little focus has been on the deleterious effects of CO2. The majority of studies within the field were performed before 1970. However, as individually ventilated cage systems (IVS), un-ventilated filter-topped cages and other tightly sealed containment systems are increasing being used and are getting tighter allowing little or no air exchange between the cage and the surrounding environment, it is reasonable also to focus on the impact of CO2. The totally sealed IVS seems to be the ultimate solution; a system which might not be so far from being available on the market. Especially during failure of the individual cage ventilation this is problematic. At present no official limits for acceptable exposure in laboratory animals have been set, although some papers have discussed the item (Lipman, 1992; Serrano, 1971) In certain countries human exposures up to 5000 ppm (0.5%) during an eighthour working day as well as short term exposures up to 10000 ppm (1.0%) are accepted, and several papers recommend these levels for humans to be applied (Serrano, 1971; Lipman, 1992; Reeb et al., 1997). On the other hand, the effects of CO2 on animals, as investigated during the fifties and sixties, seem to be quite harmless and reversible. In contrast to e.g. ammonia no studies have so far been able to show any toxicological effects caused by CO2 (King et al., 1955; Schaefer et al., 1968). The present paper summarizes the effects of CO2 revealed in studies during the fifties and sixties in order to put these into a new perspective in relation to housing animals in new containment systems, such as the individually ventilated cage system, and discusses the physiological impact on the animal and human physiology caused by CO2 and how the effects of CO2 may be regarded as a common stressor. Finally, possibilities of dealing with the CO2 as a parameter and of setting limits for CO2 exposure in relation to animals are discussed.
description: Scandinavian Journal of Laboratory Animal Sciences, Vol 27, No 3 (2000)
Exact correct-decoding exponent of the wiretap channel decoder
Creators: name: Merhav, Neri
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The security level of the achievability scheme for Wyner's wiretap channel model is examined from the perspective of the probability of correct decoding, $P_c$, at the wiretap channel decoder. In particular, for finite-alphabet memoryless channels, the exact random coding exponent of $P_c$ is derived as a function of the total coding rate $R_1$ and the rate of each sub-code $R_2$. Two different representations are given for this function and its basic properties are provided. We also characterize the region of pairs of rates $(R_1,R_2)$ of full security in the sense of the random coding exponent of $P_c$, in other words, the region where the exponent of this achievability scheme is the same as that of blind guessing at the eavesdropper side. Finally, an analogous derivation of the correct-decoding exponent is outlined for the case of the Gaussian channel.
description: 21 pages; submitted to IEEE Trans. on Information Theory
Renormalized Halo Bias
Creators: name: Assassi, Valentin
name: Baumann, Daniel
name: Green, Daniel
name: Zaldarriaga, Matias
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This paper provides a systematic study of renormalization in models of halo biasing. Building on work of McDonald, we show that Eulerian biasing is only consistent with renormalization if non-local terms and higher-derivative contributions are included in the biasing model. We explicitly determine the complete list of required bias parameters for Gaussian initial conditions, up to quartic order in the dark matter density contrast and at leading order in derivatives. At quadratic order, this means including the gravitational tidal tensor, while at cubic order the velocity potential appears as an independent degree of freedom. Our study naturally leads to an effective theory of biasing in which the halo density is written as a double expansion in fluctuations and spatial derivatives. We show that the bias expansion can be organized in terms of Galileon operators which aren't renormalized at leading order in derivatives. Finally, we discuss how the renormalized bias parameters impact the statistics of halos.
description: 44 pages, 6 figures
Doctoral thesis recital (bass trombone)
Creators: name: Lohmann, Simon
Publisher: name: The University of Texas at Austin
Year: 2023
Subjects: Bass trombone music
Bass trombone with instrumental ensemble
Chamber music

description: 1x5 for bass trombone and wind quintet / Frigyes Hidas -- Mahogany moods / James Stephenson -- Oblivion / Astor Piazzolla -- Locus iste / Anton Bruckner -- Felicity / Raymond Premru
Beating pattern in quantum magnetotransport coefficients of spin-orbit coupled Dirac fermions in gated silicene
Creators: name: Islam, SK Firoz
name: Ghosh, Tarun Kanti
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report theoretical study of magnetotransport coefficients of spin-orbit coupled gated silicene in presence and absence of spatial periodic modulation. The combined effect of spin-orbit coupling and perpendicular electric field manifests through formation of regular beating pattern in Weiss and SdH oscillations. Analytical results, in addition to the numerical results, of the beating pattern formation are provided. The analytical results yield a beating condition which will be useful to determine the spin-orbit coupling constant by simply counting the number of oscillation between any two successive nodes. Moreover, the numerical results of modulation effect on collisional and Hall conductivities are presented.
description: 5 figures and 7 pages