cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Constraints on peculiar velocity distribution of binary black holes using gravitational waves with GWTC-3
Creators: name: You, Zhi-Qiang
name: Chen, Zu-Cheng
name: Liu, Lang
name: Yi, Zhu
name: Liu, Xiao-Jin
name: Wu, You
name: Gong, Yi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Peculiar velocity encodes rich information about the formation, dynamics, evolution, and merging history of binary black holes. In this work, we employ a hierarchical Bayesian model to infer the peculiar velocity distribution of binary black holes. We use the data from GWTC-3 and assume a Maxwell-Boltzmann distribution for the peculiar velocities, but do not consider the dependence of peculiar velocity on the masses of black hole binaries. The constraint on the peculiar velocity distribution parameter, $v_0$, is weak and uninformative. However, the determination of peculiar velocity distribution can be significantly improved with next-generation ground-based gravitational wave detectors. For the Einstein Telescope, the relative uncertainty of $v_0$ will reduce to $\sim$ 10\% using $10^3$ golden binary black hole events. Our statistical approach thus provides a robust and prospective inference for determining the peculiar velocity distribution.
description: 18 pages, 3 figures; Accepted by JCAP
Multidimensional Projection Visualization: Control-points Selection and Inverse Projection Exploration
Creators: name: Portes Dos Santos Amorim, Elisa
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Computer Science
subject: Visualization
subject: Multidimensional data
subject: Inverse projection
subject: Radial Basis Functions

description: The task of interpreting multidimensional data is as important as it is challenging. The importance comes from the fact that virtually every data worth analyzing is multidimensional, while the challenge comes from the very nature of these data sets, as the multiple features describing each instance can quickly overwhelm our visual perception system, thus making it difficult to observe meaningful information. Visualization techniques play an essential role in simplifying this task, by preprocessing the data to extract critical features and displaying them effectively, by using visual metaphors that can be easily understood. Multidimensional Projection (MP) is one of such techniques, whose fundamental goal is to present an overview of the data distribution in the form of a 2D scatterplot graph. It does so by reducing the dimensionality of the dataset in such a way that distances are preserved as much as possible. MP approaches, along with most visualizations, are shifting from a static display to a more interactive one, allowing human intervention to modify the layout and facilitate exploration and understanding of the data. In this thesis, I present contributions that specifically relate to interactive aspects of multidimensional projection. First, I propose a computational framework and methodology for control points selection. Control points are a particular set of projected points used to steer and rearrange the projection layout. I demonstrate the proposed method can improve the projection quality while requiring only a small amount of control points. Second, I introduce inverse projection, a novel paradigm to create multidimensional points exclusively through 2D interactions. The projection space is transformed into a canvas, where new points can be added. These new points are then mapped into the original multidimensional space, i.e., they become unique multidimensional instances themselves. Lastly, I present the usability of the inverse projection framework in two demonstration examples. (1) A parameter exploration prototype system for optimization with multiple minima. (2) A face-synthesis application, where new face models are generated on the fly.
Roaming moduli space using dynamical triangulations
Creators: name: Ambjorn, J.
name: Barkley, J.
name: Budd, T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In critical as well as in non-critical string theory the partition function reduces to an integral over moduli space after integration over matter fields. For non-critical string theory this moduli integrand is known for genus one surfaces. The formalism of dynamical triangulations provides us with a regularization of non-critical string theory. We show how to assign in a simple and geometrical way a moduli parameter to each triangulation. After integrating over possible matter fields we can thus construct the moduli integrand. We show numerically for $c=0$ and $c=-2$ non-critical strings that the moduli integrand converges to the known continuum expression when the number of triangles goes to infinity.
description: 32 pages, many (nice) figures
ARCONS: a highly multiplexed superconducting UV to near-IR camera
Creators: name: O'Brien, Kieran
name: Mazin, Benjamin A.
name: McHugh, Sean
name: Meeker, Seth
name: Bumble, Bruce
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: ARCONS, the Array Camera for Optical to Near-infrared Spectrophotometry, was recently commissioned at the Coude focus of the 200-inch Hale Telescope at the Palomar Observatory. At the heart of this unique instrument is a 1024-pixel Microwave Kinetic Inductance Detector (MKID), exploiting the Kinetic Inductance effect to measure the energy of the incoming photon to better than several percent. The ground-breaking instrument is lens-coupled with a pixel scale of 0.23"/pixel, with each pixel recording the arrival time (<2 microsec) and energy of a photon (~10%) in the optical to near-IR (0.4-1.1 microns) range. The scientific objectives of the instrument include the rapid follow-up and classification of the transient phenomena.
description: To appear in the proceedings of IAU symposium number 285; New Horizons in Time Domain Astronomy, eds. R.E.M Griffin, R. J. Hanisch & R. Seaman
Ticking terahertz wave generation in attoseconds
Creators: name: Zhang, Dongwen
name: Lü, Zhihui
name: Meng, Chao
name: Du, Xiyu
name: Zhou, Zhaoyan
name: Zhao, Zengxiu
name: Yuan, Jianmin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We perform a joint measurement of terahertz waves and high-order harmonics generated from noble atoms driven by a fundamental laser pulse and its second harmonic. By correlating their dependence on the phase-delay of the two pulses, we determine the generation of THz waves in tens of attoseconds precision. Compared with simulations and models, we find that the laser-assisted soft-collision of the electron wave packet with the atomic core plays a key role. It is demonstrated that the rescattering process, being indispensable in HHG processes, dominant THz wave generation as well but in a more elaborate way. The new finding might be helpful for the full characterization of the rescattering dynamics.
description: 4 figures
Recursions in Calogero-Sutherland Model Based on Virasoro Singular Vectors
Creators: name: Wu, Jian-Feng
name: Xu, Ying-Ying
name: Yu, Ming
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The present work is much motivated by finding an explicit way in the construction of the Jack symmetric function, which is the spectrum generating function for the Calogero-Sutherland(CS) model. To accomplish this work, the hidden Virasoro structure in the CS model is much explored. In particular, we found that the Virasoro singular vectors form a skew hierarchy in the CS model. Literally, skew is analogous to coset, but here specifically refer to the operation on the Young tableaux. In fact, based on the construction of the Virasoro singular vectors, this hierarchical structure can be used to give a complete construction of the CS states, i.e. the Jack symmetric functions, recursively. The construction is given both in operator formalism as well as in integral representation. This new integral representation for the Jack symmetric functions may shed some insights on the spectrum constructions for the other integrable systems.
description: Latex, 32pages, 4 figures
The Art of DDI!? The Model-Driven Approach of DDI-CDI
Creators: name: Wackerow, Joachim
Publisher: name: Zenodo
Year: 2023

description: This presentation describes the model-driven approach of DDI-CDI. In this way, it is possible to generate related syntax representations (such as XML Schema and RDF) and field-level documentation of the UML model. A subset mechanism allows targeted generation for specific use cases such as the process description. Experimental work will also be shown using visualization and sonification methods to represent complex data such as the network represented by the DDI-CDI model. The talk will highlight model- and data-driven approaches.
Factors Influencing Seasonal Migrations of Pronghorn Across the Northern Sagebrush Steppe
Creators: name: Jakes, Andrew
Publisher: name: Environmental Design
Year: 2015
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Migration

description: Pronghorn (Antilocapra americana) undertake seasonal migrations and long-distance movements to satisfy annual life history requirements. To investigate these phenomena, 185 females were collared across the Northern Sagebrush Steppe (NSS) to classify migration and long-distance movement states and to analyze movement metrics. Based on 170 animal years, 55% of individuals undertook seasonal migrations. I also identified long-distance fawning-associated and driven movements during the study period. Thirty-six individuals used stopover sites during seasonal migration, principally during spring. During spring, migration was slow, sinuous and lengthy to exploit quality forage. During fall, fawning-associated and driven movements, movements were faster, more linear and shorter than spring. Both fall and spring stopover sites exhibited similar metrics, likely to profit from high quality forage areas. Next, I modelled multi-scalar migratory pathway selection in response to anthropogenic factors and environmental gradients. I found that pronghorn responded to road, well and hydrology variables at specific densities at finer scales. Generally, migratory pronghorn selected grasslands, intermediate slopes and south-facing aspects compared to other landcover types and topographic conditions. Pronghorn highly avoided increased well and road densities compared to lower densities of these features. Seasonal variation showed that during fall, pronghorn used large hydrologic systems while in spring pronghorn selected high quality forage areas. Pronghorn selected stopover sites with higher forage productivity values and lower densities of well attributes versus migratory pathways during both seasons. Relative to cultivated habitats, pronghorn avoided stopover sites in grassland or shrubland habitats versus migratory pathways. At finer scales, pronghorn slightly avoided anthropogenic features across the landscape, but at broader scales, pronghorn strongly selected against roads, natural resource wells and well drilling. I used a scale-integrated mapping approach to evaluate if such spatial predictions performed as well or better than single order scales to predict migration pathways. Finally, using scale-integrated spatial predictions, I assessed connectivity across the NSS to identify seasonal pronghorn connectivity networks. I concluded that multi-scale migration followed hierarchically nested theory where finer scale decisions are conditional on broader scales that can be assessed sequentially. I suggest that the pronghorn is a broad-scale focal species useful for designing conservation networks across the NSS.
Computational investigations of a multi-class traffic flow model: mean-field and microscopic dynamics
Creators: name: Machtalay, Amal
name: Habbal, Abderrahmane
name: Ratnani, Ahmed
name: Kissami, Imad
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We address a multi-class traffic model, for which we computationally assess the ability of mean-field games (MFGs) to yield approximate Nash equilibria for traffic flow games of intractable large finite-players. We introduce ad hoc numerical methodologies, with recourse to techniques such as High-Performance Computing (HPC) and regularization of Loose Generalized Minimal Residual (LGMRES) solvers. The developed apparatus allows us to perform simulations at significantly larger space and time discretization scales. For three generic scenarios of cars and trucks, and three cost functionals, we provide numerous numerical results related to the autonomous vehicles (AVs) traffic dynamics, which corroborate for the multi-class case the effectiveness of the approach emphasized in [22]. We additionally provide several original comparisons of macroscopic Nash mean-field speeds with their microscopic versions, allowing us to computationally validate the so-called $ε-$Nash approximation, with a rate slightly better than theoretically expected.
PECULIARITIES OF MANAGEMENT OF PATIENTS WITH CHD IN MENOPAUSAL WOMEN
Creators: name: Tashkenbayeva, Eleonora
name: Rajabova, Nilufar
name: Abdiyeva, Gulnora
name: Khasanov, Iskhokjon
Publisher: name: Zenodo
Year: 2023

description: In recent years, there have been ongoing scientific works in our country devoted to the structure of coronary heart disease and arterial hypertension in menopausal women. The significance of climacteric period severity as an important risk factor in the development of endothelial disorders in heart and vessels that are closely associated with endocrine homeostasis disorder and cardiovascular disease development has been revealed in menopausal CHD patients based on the complex immune and hormonal studies. The incidence of polymorbidity with manifestation of elevated cholesterol, TG, LDL levels and decreased levels of estradiol, estriol and progesterone increases in patients with IHD during the menopausal period.
title: Clinical Effectiveness of ListerineR and ViadentR Mouthrinses on Bacterial Plaque and Gingivitis
Creators: name: Powell, Debra Pizzola
Publisher: name: Old Dominion University Libraries
Year: 1986

description: The purpose of this investigation was to determine the effects of two commercial mouth rinses, ListerineR and ViadentR, on bacterial plaque and gingivitis. over a sixweek period, 24 adults, ages 18-41, were examined for the amount of bacterial plaque and level of gingivitis using Silness and toe's Plaque Index (PLI) and Gingival Index (GI). At the beginning of each two week period, subjects were examined for the amount of plaque and level of gingivitis and given a different mouthrinse: appointment one--viadentR (mouthrinse A), appointment two--placebo mouthrinse (mouthrinse B), and appointment three--ListerineR (mouthrinse C). Additionally, subjects were given oral and written mouthrinsing instructions at each appointment. A double-blind, cross-over design was used in this experimental pre-test/post-test research study. Results were tabulated on the basis of change in the mean Plaque and Gingival Index scores. Data were examined using a one-way analysis of variance and Tukey's studentized Range Test to determine if any statistically significant differences existed in the mean GI scores and PLI scores throughout all four appointments. Additionally, a Paired-Difference t-test was applied to data to determine if the independent variables, ViadentR mouthrinse and ListerineR mouthrinse, had a statistically significant effect on the dependent variables, gingival inflammation and bacterial plaque. Results showed that rinsing with either ViadentR or ListerineR mouthrinse as an adjunct to routine oral hygiene had no statistically significant effect on the level of gingivitis or the amount of bacterial plaque.
Supplementary Material 2.docx
Creators: name: Kennedy, Donna
name: Ridout, Deborah
name: Alexander, Caroline M.
name: Rice, Andrew SC
Publisher: name: figshare
Year: 2020
Subjects: subject: Biomarkers
subject: 110999 Neurosciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 110906 Sensory Systems

description: Healthy Volunteer Quantitative Sensory Testing Study
High-speed waveguide-coupled graphene-on-graphene optical modulators
Creators: name: Koester, Steven J.
name: Li, Mo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: An electro-absorption optical modulator concept based upon a dual-graphene layer is presented. The device consists of a silicon-on-insulator waveguide upon which two graphene layers reside, separated by a thin insulating region. The lower graphene acts as a tunable absorber, while the upper layer functions as a transparent gate electrode. Calculations based upon realistic graphene material properties show that 3-dB bandwidths over 100 GHz (30 GHz) are possible at near- (λ=1.55 μm) and mid- (λ=3.5μm) infrared bands. The effect of background doping and potential fluctuations on the bandwidth, modulation depth and insertion loss are also quantified.
description: 18 pages, 4 figure
MOTIVATSIYA VA MOTIVLARNI O'RGANISH METODLARI
Creators: name: Yo'ldashova, Marjona
Publisher: name: Zenodo
Year: 2025

description: Mazkur maqola mativatsiya va motivlarni o‘rganish metodlariga bag‘ishlangan bo‘lib, inson faoliyatining harakatlantiruvchi kuchlari, motivlarning shakllanish jarayoni hamda ularga ta’sir etuvchi omillar tahlil qilinadi. Motivatsiya shaxsning ichki va tashqi rag‘batlantiruvchi omillar ta’sirida qanday rivojlanishi, uning individual xususiyatlari va tashqi muhit sharoitlari bilan qanday bog‘liqligi haqida fikr yuritiladi. Maqolada motivatsiya tushunchasi psixologik, sotsiologik va menejment nuqtai nazaridan keng yoritilib, motivlarning turlari, ularni aniqlash va tahlil qilish usullari keltirilgan. Xususan, motivatsiyani o‘rganishda eksperimental, kuzatish, test sinovlari, intervyu va so‘rovnomalardan foydalanish usullari afzallik va kamchiliklari, ilmiy tadqiqotlarda qo‘llash imkoniyatlari muhokama qilinadi.
A Little Reflection about the Sleeping Beauty Problem
Creators: name: Barbosa, André Luiz
Publisher: name: arXiv
Year: 2023
Subjects: subject: History and Overview (math.HO)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: Primary 91B06, Secondary 62C12

description: This paper presents a little reflection about the Sleeping Beauty Problem, maybe contributing to shed light on it and perhaps helping to find a simple and elegant solution that could definitively resolve the controversies about it.
description: 10 pages, 5 tables, 1 figure, a theorem, two new versions of the Sleeping Beauty Problem, and a little reflection about it!
Distortion-free tolerance-based layer setup optimization for layered manufacturing
Creators: name: Chen, Jack Szu-Shen
Publisher: name: University of British Columbia
Year: 2010

description: Layer manufacturing has emerged as a highly versatile process to produce complex parts compared to conventional manufacturing processes, which are either too costly to implement or just downright not possible. However, this relatively new manufacturing process is characterized by a few outstanding issues that have kept the process from being widely applied. The most detrimental is the lack of a reliable method on a computational geometry level to predict the resulting part error. Layer setup with regard to the contour profile and thickness of each layer is often rendered to operator-deemed best. As a result, the manufactured part accuracy is not guaranteed and the build time is not easily optimized. Even with the availability of a scheme to predict the resulting finished part, optimal layer setup cannot be determined. Current practice generates the layer contours by simply intersecting a set of parallel planes through the computer model of the design part. The volumetric geometry of each layer is then constructed by extruding the layer contour by the layer thickness in the part building direction. This practice often leads to distorted part geometry due to the unidirectional bias of the extruded layers. Because of this, excessive layers are often employed to alleviate the effect of the part distortion. Such form of the distortion, referred to as systematic distortion, needs to be removed during layer setup. This thesis proposes methods to first remove the systematic distortion and then to determine the optimal layer setup based on a tolerance measure. A scheme to emulate the final polished part geometry is also presented. Case studies are performed in order to validate that the proposed method. The proposed scheme is shown to have significantly reduced the number of layers for constructing an LM part while satisfying a user specified error bound. Therefore, accuracy is better guaranteed due to the existence of error measure and control. Efficiency is greatly increased.
Development of Adaptable Products Based on Modular Design and Optimization Methods
Creators: name: Martinez Barragan, Maribel
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Engineering--Mechanical
subject: Adaptable product
subject: modular design
subject: Optimization

description: An adaptable product is a product that can be reconfigured or upgraded to satisfy different requirements. Among various advanced design methods, modular design approach is employed in this research for the design of adaptable products. A module in a product is a group of components that can be disassembled non-destructively from the product as a unit. In the traditional modular design approach, components of a product are grouped into modules based on similarity among their functions and/or manufacturing processes. This traditional approach does not consider that the product may have to be modified or upgraded due to a change in the requirements during the operational stage of the product. This results in a problem since the part that needs to be modified to satisfy the new requirement cannot be solely replaced and the entire module where it belongs to has to be replaced. The objective of this research is to improve the adaptable design method by developing a module design approach considering the different life-cycle properties of the components in the adaptable product. In addition, optimization is used to identify the optimal design of adaptable product. In this research, the product description in different life-cycle phases is modeled by different configurations, and each of these configurations is described by a set of parameters. The product components with similar life-cycle properties such as maintenance frequency, life-span, degradation of performance, etc. are grouped into modules. A hybrid AND-OR tree is used to model all feasible design solutions considering different configurations with their corresponding parameters at different life-cycle phases. The adaptable product at a certain life-cycle time point is evaluated by a number of evaluation measures which can have different measurement units. The evaluation measures in different units are converted into comparable evaluation indices. The overall evaluation index for an adaptable product is defined by individual evaluation indices and their importance weighting factors considering the whole product life-cycle span. A multi-level optimization method is employed to identify the best design solution, its configurations in different life-cycle phases and parameter values of the relevant configurations. A case study is implemented to demonstrate the effectiveness of the developed new adaptable design approach.
Comments on scale invariant but non-conformal supersymmetric field theories
Creators: name: Nakayama, Yu
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate a possibility of scale invariant but non-conformal supersymmetric field theories from a perturbative approach. The explicit existence of monotonically decreasing a-function that generates beta-functions as a gradient flow provides a strong obstruction for such a possibility at two-loop order. We comment on the "discovery" of scale invariant but non-conformal renormalization group trajectories via a "change of scheme" in (4-ε) dimension proposed in literatures.
description: 6 pages
Demystifying the economic and energy potential of Building-Integrated Photovoltaics in achieving India's intended Nationally Determined Contribution
Creators: name: Shankar, Ajay
name: Bukya, Mahipal
Publisher: name: Visions for Sustainability
Year: 2023

description: Globalization and swift urbanisation have led to increased energy demand across buildings. India's contributions to environmental improvement are the most ambitious in current global development. The nationally determined contributions (NDCs) look at the country's policies and programmes promoting clean energy, enhancing energy efficiency, and developing resilient urban centers. It also captures citizens' and private sector contributions to combating climate change and abating pollution. Buildings account for 35–45% of global energy consumption, and their use is increasing at an 8% annual rate. To overcome the environmental problems caused by fossil fuels, there is a need to use renewable energy sources optimally to meet the energy requirements of buildings in smart cities. Limited rooftop space in an urban environment often falls short of catering to the entire energy demand of high-rise buildings. In this paper, the building-integrated photovoltaic (BIPV) module is considered a source of clean energy on the building's facade (vertical portion). Further, the NDCs of India are discussed, and the techno-economic analysis of BIPV modules has been performed and compared with the optimally placed rooftop PV module to explore the potential of BIPV in achieving India's NDCs.
description: Visions for Sustainability, No 19 (2023) - NEW Visions online
Electron-ion Recombination of Fe XII forming Fe XI: Laboratory Measurements and Theoretical Calculations
Creators: name: Novotný, O.
name: Badnell, N. R.
name: Bernhardt, D.
name: Grieser, M.
name: Hahn, M.
name: Krantz, C.
name: Lestinsky, M.
name: Müller, A.
name: Repnow, R.
name: Schippers, S.
name: Wolf, A.
name: Savin, D. W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We have measured electron-ion recombination for Fe XII forming Fe XI using a merged beams configuration at the heavy-ion storage ring TSR located at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. The measured merged beams recombination rate coefficient (MBRRC) for collision energies from 0 to 1500 eV is presented. This work uses a new method for determining the absolute MBRRC based on a comparison of the ion beam decay rate with and without the electron beam on. For energies below 75 eV, the spectrum is dominated by dielectronic recombination (DR) resonances associated with 3s-3p and 3p-3d core excitations. At higher energies we observe contributions from 3-N' and 2-N' core excitations DR. We compare our experimental results to state-of-the-art multi-configuration Breit-Pauli (MCBP) calculations and find significant differences, both in resonance energies and strengths. We have extracted the DR contributions from the measured MBRRC data and transformed them into a plasma recombination rate coefficient (PRRC) for temperatures in the range of 10^3 to 10^7 K. We show that the previously recommended DR data for Fe XII significantly underestimate the PRRC at temperatures relevant for both photoionized plasmas (PPs) and collisionaly ionized plasmas (CPs). This is to be contrasted with our MCBP PRRC results which agree with the experiment to within 30% at PP temperatures and even better at CP temperatures. We find this agreement despite the disagreement shown by the detailed comparison between our MCBP and experimental MBRRC results. Lastly, we present a simple parameterized form of the experimentally derived PRRC for easy use in astrophysical modelling codes.
description: April 24, 2012: accepted for publication in The Astrophysical Journal
AdS--Maxwell superalgebra and supergravity
Creators: name: Durka, R.
name: Kowalski-Glikman, J.
name: Szczachor, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we derive the Anti de Sitter counterpart of the super-Maxwell algebra presented recently by Bonanos et.\ al. Then we gauge this algebra and derive the corresponding supergravity theory, which turns out to be described by the standard N=1 supergravity lagrangian, up to topological terms.
description: 8 pages, in v2 reference added
The Diversity-Multiplexing-Delay Tradeoff in MIMO Multihop Networks with ARQ
Creators: name: Xie, Yao
name: Gunduz, Deniz
name: Goldsmith, Andrea J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We study the tradeoff between reliability, data rate, and delay for half-duplex MIMO multihop networks that utilize the automatic-retransmission-request (ARQ) protocol both in the asymptotic high signal-to-noise ratio (SNR) regime and in the finite SNR regime. We propose novel ARQ protocol designs that optimize these tradeoffs. We first derive the diversity-multiplexing-delay tradeoff (DMDT) in the high SNR regime, where the delay is caused only by retransmissions. This asymptotic DMDT shows that the performance of an N node network is limited by the weakest three-node sub-network, and the performance of a three-node sub-network is determined by its weakest link, and, hence, the optimal ARQ protocol needs to equalize the performance on each link by allocating ARQ window sizes optimally. This equalization is captured through a novel Variable Block-Length (VBL) ARQ protocol that we propose, which achieves the optimal DMDT. We then consider the DMDT in the finite SNR regime, where the delay is caused by both the ARQ retransmissions and queueing. We characterize the finite SNR DMDT of the fixed ARQ protocol, when an end-to-end delay constraint is imposed, by deriving the probability of message error using an approach that couples the information outage analysis with the queueing network analysis. The exponent of the probability of deadline violation demonstrates that the system performance is again limited by the weakest three-node sub-network. The queueing delay changes the consideration for optimal ARQ design: more retransmissions reduce decoding error by lowering the information outage probability, but may also increase message drop rate due to delay deadline violations. Hence, the optimal ARQ should balance link performance while avoiding significant delay.
description: Submitted to IEEE Trans. Info. Theory
Complete Characterization of Quantum Optical Processes with a Focus on Quantum Memory
Creators: name: Kupchak, Connor
Publisher: name: Graduate Studies
Year: 2013
Subjects: Physics--Atomic
Optics

description: This thesis introduces and implements a characterization procedure called coherent state quantum process tomography and applies it to a selection of quantum operations. The procedure holds advantages over previous quantum process tomography methods, a pri- mary one is that a process can be characterized by measuring its effect on a set of coherent states which are readily available from a laser source. After introduction of the characterization procedure, the method is tested on a simple process of an electro-optical modulator and polarizing beam splitter. The accuracy of the characterization is verified by comparison of the predicted action of the reconstructed process tensor versus the actual experiment involving a squeezed vacuum state. The algorithm is then implemented and verified on a quantum memory system based on electromagnetically induced transparency, a system that was previously shown capable of storing a squeezed vacuum state. Lastly, a new optical storage system based on a gradient echo memory scheme is con- structed and optimized to achieve memory retrieval efficiencies of >80%. To characterize this system, a modified coherent state quantum process tomography algorithm based on the method of maximum likelihood estimation is employed. Despite the high efficiency values, the presence of excess noise resulted in the degradation of the storage device per- formance to be below the benchmarks of a quantum memory system. This estimation algorithm is also successfully implemented on the non-deterministic processes of photon creation and annihilation.
Fermions on deformed thick branes
Creators: name: Cruz, W. T.
name: Gomes, A. R.
name: Almeida, C. A. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work we investigate the issue of fermion localization and resonances in $(4,1)$-deformed branes constructed with one scalar field coupled with gravity. Such models provide us branes with internal structures that turns the gravitational interaction more effective for fermions aside the brane, increasing their lifetime. The coupling between the scalar field and spinors is a necessary condition for fermions to be localized on such branes. After performing a chiral decomposition of the five-dimensional spinor we found resonances with both chiralities. The correspondence between the spectra for left and right chirality is guaranteed and Dirac fermions are realized on the brane.
description: 6 pages, 4 figures. To appear in European Physical Journal C. arXiv admin note: substantial text overlap with arXiv:0912.4021
DKD-Ringvergleich zur Kalibrierung von Maßbändern : Vergleichsbericht DKD-V 4-5
Creators: name: Pollinger, Florian
name: Wedde, Martin
Publisher: name: Physikalisch-Technische Bundesanstalt (PTB)
Year: 2023
Subjects: Ringvergleich
Maßband
DKD
DIN EN ISO/IEC 17043

description: Maßbänder sind traditionelle Messinstrumente, die mit hoher Genauigkeit gefertigt werden können und vielfältig eingesetzt werden. In den letzten Jahren sind einige Kalibrierlaboratorien von der DAkkS für die Kalibrierung dieser Messinstrumente neu akkreditiert worden, und einige weitere haben Interesse an einer solchen Akkreditierung geäußert. Da Maßbänder auch häufig im geschäftlichen Verkehr eine wichtige Rolle spielen, verfügen auch einige Eichämter in Deutschland über entsprechende, sehr leistungsfähige Messeinrichtungen zur Konformitätsprüfung. Im Rahmen des DKD wird nun erstmalig ein gemeinsamer nationaler Ringvergleich zur Kalibrierung von Maßbändern durchgeführt, um die Qualität dieser Dienstleistung zu demonstrieren und sicherzustellen. An dem Ringvergleich nahmen 15 Laboratorien teil. Die Messergebnisse werden anonymisiert veröffentlicht.
DECONSTRUCTING TRANSLATION: ANALYZING TWO ENGLISH VERSIONS OF DIAGNOSTICS OF TRADITIONAL CHINESE MEDICINE
Creators: name: Ming, Zhang
Publisher: name: SADI journals
Year: 2023
Subjects: Deconstruction
Translation
Traditional Chinese Medicine
Diagnostics
Différance

description: This paper delves into the intricate realm of translation using Jacque Derrida's concept of "différance" from the perspective of deconstruction. It navigates through the philosophy of language and structuralism, asserting that language can only refer to evolving concepts rather than fixed meanings. Traditional Chinese medicine (TCM), steeped in a history spanning over two millennia, represents a reservoir of Chinese culture, embodying the wisdom and knowledge amassed in the battle against diseases. The diagnostics of TCM form the vital bridge between its fundamental theories and clinical practice. With TCM gaining global recognition and acceptance, its translation plays a pivotal role in its integration into international medical discourse and the promotion of TCM culture. This paper scrutinizes the translation of TCM terminology in two English versions of "Diagnostics of Traditional Chinese Medicine" through the lens of Derrida's "différance," shedding light on the nuances and complexities of this linguistic endeavor.
Mapping Current Adult Intensive Care Unit Patient Care Rounding Practices
Creators: name: Holodinsky, Jessalyn
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Medicine and Surgery
subject: Rounds

description: Effective communication is essential for high quality patient care; within the ICU the majority of health care provider communication occurs during patient care rounds. While several best practices for rounds have been proposed it is unclear if they are being used in Canadian adult Intensive Care Units (ICU). The objective of this thesis was to describe current rounding practices in a sample of Canadian adult ICUs. A prospective observational study consisting of a national survey and follow up interviews was undertaken. ICU rounding practices were found to be heterogeneous across the country and overall self-rated rounding quality was high, but several opportunities for improvement were highlighted. This thesis proposes five recommendations for rounding practices: defining participants and roles, managing interruptions, further study on patient and family involvement, streamlining teaching during rounds, and creating an objective metric to assess rounding quality. A structured tool for use during ICU rounds is also proposed.
Expected gamma-ray emission from x-ray binaries
Creators: name: Bednarek, W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: It is at present well known that conditions at some massive binary systems allow acceleration of particles and production of the GeV-TeV gamma-rays. However, which particles are responsible for this emission and what radiation processes are engaged is at present not completely clear. We discuss what parameters can determine the acceleration process of particles and high energy radiation produced by them within massive binary systems.
description: 12 pages, 6 figures, in Proc. HEPRO III Conference (eds. J.M. Paredes & M. Ribo), accepted to Int.J.Mod.Phys.Conf.Series
Perspectives of cross correlation in seismic monitoring at the International Data Centre
Creators: name: Bobrov, Dmitry
name: Kitov, Ivan
name: Zerbo, Lassina
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geophysics (physics.geo-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We demonstrate that several techniques based on cross correlation are able to significantly reduce the detection threshold of seismic sources worldwide and to improve the reliability of IDC arrivals by a more accurate estimation of their defining parameters. More than ninety per cent of smaller REB events can be built in automatic processing while completely fitting the REB event definition criteria. The rate of false alarms, as compared to the events rejected from the SEL3 in the current interactive processing, has also been dramatically reduced by several powerful filters. The principal filter is the difference of arrival times between the master events and newly built events at three or more primary stations, which should lie in a narrow range of a few seconds. Two effective pre-filters are f-k analysis and Fprob based on correlation traces instead of original waveforms. As a result, cross correlation may reduce the overall workload related to IDC interactive analysis and provide a precise tool for quality check for both arrivals and events. Some major improvements in automatic and interactive processing achieved by cross correlation are illustrated by an aftershock sequence of a large continental earthquake. Exploring this sequence, we describe schematically the next steps for the development of a processing pipeline parallel to the existing IDC one in order to improve the quality of the REB together with the reduction of the magnitude threshold. The current IDC processing pipeline should be focused on the events in areas without historical seismicity which are not properly covered by REB events.
description: 47 pages, 13 figures, 9 tables
Impact of Lipid Based Anticancer Drugs on Biomimetic Lipid Models and Eukaryotic Membranes
Creators: name: Mahadeo, Mark
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Biology--Molecular
subject: Biophysics--Medical
subject: Biochemistry
subject: Lipids
subject: Membranes
subject: Biophysics
subject: Antitumor
subject: Anticancer
subject: Monolayers
subject: BAM
subject: Edelfosine
subject: Miltefosine
subject: Perifosine
subject: DSC
subject: Fluorescence

description: Synthetic anti-tumour lipids are a class of drugs derived from lysophosphatidylcholine that are both cytotoxic and cytostatic and exert these effects preferentially on tumour cells compared to healthy tissues. Additionally, unlike most conventional chemotherapeutics, which target DNA, these drugs are membrane active and therefore non – mutagenic. These properties reduce both the amount and severity of side effects, improving the therapy for patients. While the mode of action has not been fully elucidated, it is believed that these drugs accumulate preferentially in rigid lipid domains leading to breakdown of these membrane structures. These domains are important sites for signal transduction and membrane trafficking and their disruption impacts cellular functions at various levels. Thus, the goal of this thesis was to use biophysical techniques to better characterize the properties and mode of action of three representative drugs: edelfosine, miltefosine and perifosine. Membrane extracts of Saccharomyces cerevisiae (budding yeast) cells treated with these drugs were spread as monolayers and characterized by surface pressure – area isotherms and Brewster angle microscopy. Edelfosine and miltefosine caused a breakdown of lateral domain organization, while perifosine did not. Additionally, the effect of the drugs on monolayers of diacylglycerol (which was found to sensitize cells to the drugs) and phosphatidic acid (which was found to be protective) were characterized similarly. These results showed that edelfosine and miltefosine stabilized both lipids, while perifosine destabilized diacylglycerol. Differential scanning calorimetry results also showed that phosphatidic acid had a protective effect against destabilization of the bilayers by the drugs. Finally, an assay using the fluorescent dye laurdan demonstrated that the different drugs induced different levels of fluidization on membranes based on the proportion of cholesterol and sphingomyelin. Overall these drugs were shown to have different interactions with different lipid classes, which contribute to a better understanding of their mode of action.
On the Hamilton-Jacobi Theory for Singular Lagrangian Systems
Creators: name: de León, Manuel
name: Marrero, Juan Carlos
name: de Diego, David Martín
name: Vaquero, Miguel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We develop a Hamilton-Jacobi theory for singular lagrangian systems using the Gotay-Nester-Hinds constraint algorithm. The procedure works even if the system has secondary constraints.
description: 36 pages
Μεταβολές στην σκέψη για τον ιό κατά την διάρκεια του εγκλεισμού λόγω της επιδημίας COVID-19.
Creators: name: Ατσιόβα Μαρίνα Μπόρις
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Κορωνοιός
Υποχρεωτικός εγκλεισμός
Σκέψεις
Covid-19
Mandatory lockdown
Thoughts

description: Σκοπός της έρευνας ήταν η μελέτη του τρόπου που η πανδημία COVID-19 και ο υποχρεωτικός εγκλεισμός επηρέασαν τις σκέψεις του ελληνικού πληθυσμού γύρω από τον ιό, κατά την διάρκεια του πρώτου υποχρεωτικού εγκλεισμού στην Ελλάδα. Στην έρευνα συμμετείχαν 2756 γυναίκες, 621 άνδρες και 22 συμμετέχοντες που δήλωσαν άλλο. Η συλλογή των δεδομένων έγινε διαδικτυακά με ανώνυμο ερωτηματολόγιο από τις 11 Απριλίου έως τις 1 Μαΐου 2020, το οποίο εκτός των άλλων εξέταζε στοιχεία δημογραφικά και επιδημιολογικά. Κατά την διαδικασία της στατιστικής ανάλυσης και με σκοπό την δημιουργία ενός σταθμισμένου ερευνητικού δείγματος με χαρακτηριστικά όσο πιο κοντά σε αυτά του ελληνικού γενικού πληθυσμού, πραγματοποιήθηκε εκ των υστέρων στρωματοποίηση του δείγματος, το οποίο αναλύθηκε και επιδημιολογικά. Τα αποτελέσματα έδειξαν ότι οι συμμετέχοντες σε μεγάλο βαθμό πίστευαν στην αποτελεσματικότητα των προληπτικών μέτρων, εφάρμοζαν τα μέτρα αυτά και τους κανόνες του υποχρεωτικού εγκλεισμού, ένιωθαν ότι η κατάσταση είναι αγχωτική, ήταν ικανοποιημένη με την πληροφόρηση και φοβόντουσαν περισσότερο για το αν νοσήσει κάποιο μέλος της οικογένειας τους παρά οι ίδιοι. Από την σύγκριση των δεδομένων αυτών με άλλες χώρες παρατηρήθηκε συμφωνία μεταξύ των δεδομένων και παρουσία ποικίλων παραγόντων που τα επηρεάζουν
description: The aim of the research was to study how the COVID-19 pandemic and mandatory lockdown affected the thoughts of the Greek population around the virus, during the first mandatory lockdown in Greece. The survey included 2756 women, 621 men and 22 participants who stated other. The data were collected online, from April 11 to May 1, 2020, by an anonymous questionnaire which included demographic and epidemiological data. During the process of statistical analysis and in order to create a standardized study sample with characteristics as close as possible to those of the Greek general population, a method of simplified post-stratification was used. The sample was also analyzed epidemiologically. The results showed that most of the participants believed in the effectiveness of preventive measures, applied these measures and the rules of mandatory lockdown, felt that the situation was stressful, were satisfied with the information was given for the virus and were more afraid that a family member will get sick than for themselves. From the comparison of these data with other countries, agreement between the data was observed. Also was observed the presence of various factors that influence them
Ultra-Low Background Germanium Assay at the Boulby Underground Laboratory
Creators: name: Scovell, P. R.
name: Meehan, E.
name: Paling, S. M.
name: Thiesse, M.
name: Liu, X.
name: Ghag, C.
name: Ginsz, M.
name: Quirin, P.
name: Ralet, D.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: As we move to an era where next generation low-background particle physics experiments begin to be designed and constructed, the ability to assay materials with high sensitivity and at speed with a variety of techniques will be key. This paper describes the Mirion Technologies (Canberra) specialty ultra-low background detectors installed and commissioned at the Boulby Underground Laboratory between 2017 and 2021. The low background levels of the detectors combine with low background shielding and a radon-reduced dry nitrogen purge system to give sensitivity approaching the best in the world without the need for intricate shielding solutions. For an optimised sample geometry, run for 100 days, it would be possible to reach close to 10 $μ$Bq/kg ($10^{-12}$ g/g) for background isotopes of interest in neutrinoless double-beta decay.