cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Optimal control of infinite dimensional bilinear systems: Application to the heat and wave equations
Creators: name: Aronna, M. Soledad
name: Bonnans, Frédéric
name: Kröner, Axel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49K20, 49K27

description: In this paper we consider second order optimality conditions for a bilinear optimal control problem governed by a strongly continuous semigroup operator, the control entering linearly in the cost function. We derive first and second order optimality conditions, taking advantage of the Goh transform. We then apply the results to the heat and wave equations.
description: To appear in Mathematical Programming
Engineering Photonic Floquet Hamiltonians through Fabry Pérot Resonators
Creators: name: Sommer, Ariel
name: Simon, Jonathan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this letter we analyze an optical Fabry-Pérot resonator as a time-periodic driving of the (2D) optical field repeatedly traversing the resonator, uncovering that resonator twist produces a synthetic magnetic field applied to the light within the resonator, while mirror aberrations produce relativistic dynamics, anharmonic trapping, and spacetime curvature. We develop a Floquet formalism to compute the effective Hamiltonian for the 2D field, generalizing the idea that the intra-cavity optical field corresponds to an ensemble of non-interacting, massive, harmonically trapped particles. This work illuminates the extraordinary potential of optical resonators for exploring the physics of quantum fluids in gauge fields and exotic space-times.
description: 18 Pages, 4 Figures
Individual Limb Mechanical Analysis of Gait Following Stroke
Creators: name: Mahon, Caitlin
Publisher: name: University of North Carolina at Chapel Hill
Year: 2013

description: Following stroke, hemiparesis can lead to gait impairment, characterized by limb mechanical asymmetry and metabolic inefficiency. Due to the importance of ambulation at home and in the community, post-stroke rehabilitation often focuses on recovery of gait, including increasing self-selected walking speeds. An in depth comparison between individual limb mechanics and their role in gait inefficiencies would allow for improvements to rehabilitation programs by guiding more specific therapies. Recently, the step-to-step transition of a stride has been studied more closely in unimpaired individuals through the pendulum model of walking, and has been shown to be a period of high mechanical and metabolic power output. The purpose of this study was to perform an individual limb analysis of post-stroke hemiparetic walking during different phases of a stride, including the step-to-step transition, in order to assess limb mechanical asymmetries and how they relate to severity of gait impairment.
Unusual Corrections to Scaling and Convergence of Universal Renyi Properties at Quantum Critical Points
Creators: name: Sahoo, Sharmistha
name: Stoudenmire, E. Miles
name: Stéphan, Jean-Marie
name: Devakul, Trithep
name: Singh, Rajiv R. P.
name: Melko, Roger G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: At a quantum critical point, bipartite entanglement entropies have universal quantities which are subleading to the ubiquitous area law. For Renyi entropies, these terms are known to be similar to the von Neumann entropy, while being much more amenable to numerical and even experimental measurement. We show here that when calculating universal properties of Renyi entropies, it is important to account for unusual corrections to scaling that arise from relevant local operators present at the conical singularity in the multi-sheeted Riemann surface. These corrections grow in importance with increasing Renyi index. We present studies of Renyi correlation functions in the 1+1 transverse-field Ising model (TFIM) using conformal field theory, mapping to free fermions, and series expansions, and the logarithmic entropy singularity at a corner in 2+1 for both free bosonic field theory and the TFIM, using numerical linked cluster expansions. In all numerical studies, accurate results are only obtained when unusual corrections to scaling are taken into account. In the worst case, an analysis ignoring these corrections can get qualitatively incorrect answers, such as predicting a decrease in critical exponents with the Renyi index, when they are actually increasing. We discuss a two-step extrapolation procedure that can be used to account for the unusual corrections to scaling.
description: 14 pages including appendices, 6 figures
On the Extraction of Exchange Parameters in Transition-Metal Perovskites
Creators: name: Furrer, A.
name: Podlesnyak, A.
name: Krämer, K. W.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The extraction of exchange parameters from measured spin-wave dispersion relations has severe limitations particularly for magnetic compounds such as the transition-metal perovskites, where the nearest-neighbor exchange parameter usually dominates the couplings between the further-distant-neighbor spins. Very precise exchange parameters beyond the nearest-neighbor spins can be obtained by neutron spectroscopic investigations of the magnetic excitation spectra of isolated multimers in magnetically diluted compounds. This is exemplified for manganese trimers in the mixed three- and two-dimensional perovskite compounds KMnxZn1-xF3 and K2MnxZn1-xF4, respectively. It is shown that the small exchange couplings between the second-nearest and the third-nearest neighboring spins can be determined unambiguously and with equal precision as the dominating nearest-neighbor exchange coupling.
description: 20 pages, 5 figures
On some examples of para-Hermite and para-Kähler Einstein spaces with $Λ\ne 0$
Creators: name: Chudecki, Adam
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Spaces equipped with two complementary (distinct) congruences of self-dual null strings and at least one congruence of anti-self-dual null strings are considered. It is shown that if such spaces are Einsteinian then the vacuum Einstein field equations can be reduced to a single nonlinear partial differential equation of the second order. Different forms of these equations are analyzed. Finally, several new explicit metrics of the para-Hermite and para-Kähler Einstein spaces with $Λ\ne 0$ are presented. Some relation of that metrics to a modern approach to mechanical issues is discussed.
Properties of Light: Investigation of the Interaction of Light with Media
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: reflection, refraction, interference, convex lens, concave length, diffraction grating.

description: Abstract – The wave properties of light were verified in a series of experiments that utilize elements of different refractive index, lens elements that focus or magnify images, and the interference of light was verified using a diffraction grating of preset number of slits. The behavior of light in the cases of reflection and refraction is governed by the refractive indices of the two media according to the laws of reflection and refraction. The results were found to be in good agreement with the theory. As for the interaction of light with lens, the law of lens was found to be in good agreement with the experimental results. Finally, the interference of light was verified through a Young’s interference setup. The pattern formation was found to be in agreement with the conditions of formation of bright and dark fringes, thus the interference and wave nature of light was verified.
Local structures and local exchange interactions in doped magnetic materials of different dimensionality
Creators: name: Furrer, Albert
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Defects intentionally introduced into magnetic materials often have a profound effect on the physical properties. Specifically tailored neutron spectroscopic experiments can provide detailed information on both the local exchange interactions and the local distances between the magnetic atoms around the defects. This is demonstrated for manganese dimer excitations observed for the magnetically diluted three-, two- and one-dimensional compounds KMnxZn1-xF3, K2MnxZn1-xF4 and CsMnxMg1-xBr3, respectively, with x=0.10. The resulting local exchange interactions deviate up to 10% from the average, and the local Mn-Mn distances are found to vary stepwise with increasing internal chemical pressure due to the Mn/Zn or Mn/Mg substitution. Our analysis qualitatively supports the theoretically predicted decay of atomic displacements according to 1/r**2, 1/r and constant (for three-, two- and one-dimensional compounds, respectively) where r denotes the distance of the displaced atoms from the defect.
description: 6 pages, 3 figures, 1 table. arXiv admin note: text overlap with arXiv:1406.0602
The case of muddled units in temporal discounting
Creators: name: Vincent, Benjamin
name: Stewart, Neil
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: cognitive modelling
subject: delay discounting
subject: dimensional analysis
subject: inter-temporal choice

description: While parameters are crucial components of cognitive models, relatively little importance has been given to their units. We show that this has lead to some parameters to be contaminated, introducing an artifactual correlation between them. We also show that this has led to the illegal comparison of parameters with different units of measurement – this may invalidate parameter comparisons across participants, conditions, groups, or studies. We demonstrate that this problem affects two related models: Stevens’ Power Law and Rachlin’s delay discounting model. We show that it may even affect models which superficially avoid the incompatible units problem, such as hyperbolic discounting. We present simulation results to demonstrate the extent of the issues caused by the muddled units problem. We offer solutions in order to avoid the problem in the future or to aid in re-interpreting existing datasets.
A universal structural and star-forming relation since $z\sim3$: connecting compact star-forming and quiescent galaxies
Creators: name: Barro, G.
name: Faber, S. M.
name: Koo, D. C.
name: Dekel, A.
name: Fang, J. J.
name: Trump, J. R.
name: Perez-Gonzalez, P. G.
name: Pacifici, C.
name: Primack, J. R.
name: Somerville, R. S.
name: Yan, H.
name: Guo, Y.
name: Liu, F.
name: Ceverino, D.
name: Kocevski, D. D.
name: McGrath, E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the evolution of the core (r<1 kpc) and effective (r 9.5 M_sun/kpc^2. This threshold provides the most effective selection criterion to identify the star-forming progenitors of quiescent galaxies at all redshifts.
description: Submitted to ApJ. Figure 8 summarizes the universal star-forming/structural relation. Figure 6 illustrates the possible evolutionary paths of SFGs and quiescent galaxies in surface density vs. mass. The cartoon in Figure 12 shows the change in structural properties and visual appearances for galaxies in these evolutionary paths
Project Portfolio Management
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: Portfolio management, project management

description: Organizations worldwide are increasingly establishing project administrations and project management offices to support the success and sustain the benefits of projects in a bid to meet the objectives of shareholders and meet strategic goals of the business. Portfolio management as an approach aims to achieve the strategic goals by selecting, prioritizing, assessing and managing projects, programs and other works related based on how they are aligned and contribute t the strategies and objectives of the organization. A portfolio is a reflection of the investments made by the organization which are related to or aligned with the objectives and strategic goals of the organization. Through it, priorities are identified and decisions regarding investments are made and resources allocated to achieve the strategic goals and objectives. The organization is obliged to ask itself why the work is being undertaken if the components of the portfolio, such as programs, projects and other related works, are not aligned with the organizational strategies.
The Effect of Disease-induced Mortality on Structural Network Properties
Creators: name: Gallos, Lazaros K.
name: Fefferman, Nina H.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: As the understanding of the importance of social contact networks in the spread of infectious diseases has increased, so has the interest in understanding the feedback process of the disease altering the social network. While many studies have explored the influence of individual epidemiological parameters and/or underlying network topologies on the resulting disease dynamics, we here provide a systematic overview of the interactions between these two influences on population-level disease outcomes. We show that the sensitivity of the population-level disease outcomes to the combination of epidemiological parameters that describe the disease are critically dependent on the topological structure of the population's contact network. We introduce a new metric for assessing disease-driven structural damage to a network as a population-level outcome. Lastly, we discuss how the expected individual-level disease burden is influenced by the complete suite of epidemiological characteristics for the circulating disease and the ongoing process of network compromise. Our results have broad implications for prediction and mitigation of outbreaks in both natural and human populations.
description: 23 pages, 6 figures
GGOS-Portal: Towards a unique access point for geodetic observations and products
Creators: name: Sehnal, Martin
name: Angermann, Detlef
name: Elger, Kirsten
name: Steiner, Lena
Publisher: name: Zenodo
Year: 2023
Subjects: GGOS
Portal
Survey
IAG

description: The services of the International Association of Geodesy (IAG) provide very important and valuable geodetic data, information, and data products that are increasingly relevant for Earth system research, including monitoring of global change phenomena and a wide range of diverse applications such as satellite navigation, surveying, mapping, engineering, geospatial information systems, and so on. Currently, it is difficult for many people to obtain an overview of all available geodetic products and data. The Global Geodetic Observing System (GGOS) of the IAG aims to fill this gap by developing the GGOS-Portal (ggos.org/portal), which will serve as a unique search and access point (one-stop shop) for geodetic data and products. Data and products will be described by rich metadata and remain physically located at their originating data centers of each contributing IAG service and other data providers. With this future platform, GGOS will contribute to increase the visibility of geodetic data for scientific research and to make other disciplines and the society aware of geodesy and its beneficial products. To get an overview of the current availability of data products and their metadata, GGOS conducted a survey within the geodetic and geoscience community. This survey also inquired the opinions of geodetic data users on data availability and visibility, as well as desired requirements for a comprehensive and user-friendly GGOS-Portal.
A Series of Good Works: The Photographic Legacy of Reverend Lonzie Odie Taylor
Creators: name: Ridder-Beardsley, Emily
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2017

description: This thesis addresses the life and photographic legacy of early 20th century African American photographer, Reverend Lonzie Odie Taylor. I argue the self-taught photographer and Baptist minister’s work helped shape narratives of self-definition in Memphis’ Black community in the 1930s and 1940s. Taylor’s images are grounded in his ideals and aspirations, highlighting themes of dignity, pride, and emancipation that counteract hegemonic stereotypes of Black communities promoted by outsiders in the Jim Crow South. This, I argue, reflects the construction of a productive new social imaginary, a concept borrowed from Charles Taylor. I conclude by arguing that, while many of L.O. Taylor’s contemporaries were championing the visualization of the “New Negro,” his position as photographer and minister provided him a unique opportunity to guide his community both spiritually and visually to aspire to self-determination, social mobility, and material success in a rapidly modernizing context.
title: Основы сварочного производства
title: Практикум по конструированию сварочных приспособлений
titleType: Subtitle
Creators: name: Хайдарова А.А.
name:  Гнюсов С.Ф.
Publisher: name: Профобразование
Year: 2017

description: Дается комплекс рекомендаций и заданий по выполнению практических работ по дисциплине «Основы сварочного производства». Большое внимание уделено конструированию сварочных приспособлений. Приводятся основные этапы конструирования приспособлений, указания к разработке схемы базирования сборочных элементов конструкций, расчету необходимых усилий закрепления деталей в зависимости от деформаций сварных конструкций и расчету элементов зажимных устройств, разработке принципиальной схемы приспособления. Предназначено для студентов, обучающихся по специальности «Монтаж и эксплуатация оборудования и систем газоснабжения».
description: Given a set of recommendations and tasks for performance of practical works on discipline "Fundamentals of welding production". Much attention is paid to design of welding fixtures. Main stages of designing fixtures, specifying the development of the scheme of basing of Assembly of structural elements, calculation of the effort required secure parts, depending on the deformation of welded structures and calculation of elements of clamping devices, the development of the concept of adaptation. Is intended for students trained on a speciality "Installation and operation of equipment and gas supply systems".
A Tale of Two Timescales: Mixing, Mass Generation, and Phase Transitions in the Early Universe
Creators: name: Dienes, Keith R.
name: Kost, Jeff
name: Thomas, Brooks
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Light scalar fields such as axions and string moduli can play an important role in early-universe cosmology. However, many factors can significantly impact their late-time cosmological abundances. For example, in cases where the potentials for these fields are generated dynamically --- such as during cosmological mass-generating phase transitions --- the duration of the time interval required for these potentials to fully develop can have significant repercussions. Likewise, in scenarios with multiple scalars, mixing amongst the fields can also give rise to an effective timescale that modifies the resulting late-time abundances. Previous studies have focused on the effects of either the first or the second timescale in isolation. In this paper, by contrast, we examine the new features that arise from the interplay between these two timescales when both mixing and time-dependent phase transitions are introduced together. First, we find that the effects of these timescales can conspire to alter not only the total late-time abundance of the system --- often by many orders of magnitude --- but also its distribution across the different fields. Second, we find that these effects can produce large parametric resonances which render the energy densities of the fields highly sensitive to the degree of mixing as well as the duration of the time interval over which the phase transition unfolds. Finally, we find that these effects can even give rise to a "re-overdamping" phenomenon which causes the total energy density of the system to behave in novel ways that differ from those exhibited by pure dark matter or vacuum energy. All of these features therefore give rise to new possibilities for early-universe phenomenology and cosmological evolution. They also highlight the importance of taking into account the time dependence associated with phase transitions in cosmological settings.
description: Comments: 35 pages, LaTeX, 31 figures, 1 table
Probing quantum capacitance in a 3D topological insulator
Creators: name: Kozlov, D. A.
name: Bauer, D.
name: Ziegler, J.
name: Fischer, R.
name: Savchenko, M. L.
name: Kvon, Z. D.
name: Mikhailov, N. N.
name: Dvoretsky, S. A.
name: Weiss, D.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We measure the quantum capacitance and probe thus directly the electronic density of states of the high mobility, Dirac type of two-dimensional electron system, which forms on the surface of strained HgTe. Here we show that observed magneto-capacitance oscillations probe, in contrast to magnetotransport, primarily the top surface. Capacitance measurements constitute thus a powerful tool to probe only one topological surface and to reconstruct its Landau level spectrum for different positions of the Fermi energy.
description: 5 pages of the main text with 3 figures + 10 appendix pages with 7 figures
Reliance on courts and judicial means over strikes and negotiation in Labor Politics
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: Decision, Court, Supreme, Case, Labor, Strike, canada

description: Abstract The twenty-first century has seen reliance on courts and judicial means rather than strikes and negotiations in addressing core predicaments, political controversies, and public policy questions. Courts have been at center stage in resolving labor disputes. One of the most notable judicial means of resolving Supreme Court cases was the Canadian Supreme Court ruling that collective bargaining was protected by the Canadian Charter of Rights and Freedoms. Apart from this, striking is a social practice embedded deeply in the history of Canada. The Court is likely to consider the history of labor law to determine if the freedom of strike is also protected by the constitution. It is the possibility of a strike that enables workers to negotiate with employers in the present state of society as unions themselves are unable to secure terms of approximate equality. A compromised, suppressed, or limited trade union movement transforms into a capitalistic institution for disciplining workers and profit-making. This paper looks into why labor unions win court cases since 1982 in the face of the fact that freedom of association and the right to strike is enshrined in the Canadian Charter of Rights and Freedom.
Portfolio and Risk Management: Growing Your Investment Portfolio
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: Efficient Market Hypothesis, behavioral finance, HFT and Algorithm trading, Biased investors, Neoclassical corporate finance, Portfolio and Risk Management, Investment Portfolio

description: Introduction Investment in stocks is aimed at taking advantage of eliminating risks and making profits off opportunities in the stock market. It is essential to take into consideration financial accounting when making investment decisions. For this reason, Investors need to have a basic understanding of the critical financial statements of a business and how each project affects the statement. This helps improve communication and cooperation between the financial entities and the investors. This also helps in making better investment decisions. Stock investment is founded on risk elimination and increasing stock earnings in the face of ever-increasing money velocity. Stock investment is housed as a business on government-supported legal entities. Tax payment is one of the legal requirements that governments demand of businesses which is only made possible when money is earned and profits made. This implies that money-making and risk elimination is the primary goal of any business. The government requires businesses to provide financial insights for the protection of their legal status of businesses. In light of these, businesses adhere to generally accepted accounting principles to meet their tax payment obligations. Investors and the government use the three primary financial statements: the balance sheet, the cash flow statement, and the income statement made from the same accounting data, including the general ledger. Investors pay attention to and use these documents to make their investment decisions. This paper approaches an overview and explanation of investment risk management, portfolio investment, and the importance of financial knowledge and portfolio diversification in a bid to make a fortune in the stock trade.
LHCb Topological Trigger Reoptimization
Creators: name: Likhomanenko, Tatiana
name: Ilten, Philip
name: Khairullin, Egor
name: Rogozhnikov, Alex
name: Ustyuzhanin, Andrey
name: Williams, Michael
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The main b-physics trigger algorithm used by the LHCb experiment is the so-called topological trigger. The topological trigger selects vertices which are a) detached from the primary proton-proton collision and b) compatible with coming from the decay of a b-hadron. In the LHC Run 1, this trigger, which utilized a custom boosted decision tree algorithm, selected a nearly 100% pure sample of b-hadrons with a typical efficiency of 60-70%; its output was used in about 60% of LHCb papers. This talk presents studies carried out to optimize the topological trigger for LHC Run 2. In particular, we have carried out a detailed comparison of various machine learning classifier algorithms, e.g., AdaBoost, MatrixNet and neural networks. The topological trigger algorithm is designed to select all "interesting" decays of b-hadrons, but cannot be trained on every such decay. Studies have therefore been performed to determine how to optimize the performance of the classification algorithm on decays not used in the training. Methods studied include cascading, ensembling and blending techniques. Furthermore, novel boosting techniques have been implemented that will help reduce systematic uncertainties in Run 2 measurements. We demonstrate that the reoptimized topological trigger is expected to significantly improve on the Run 1 performance for a wide range of b-hadron decays.
description: 21st International Conference on Computing in High Energy Physics (CHEP2015)
Profit and Loss Statements and Project Management
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: project management, profit and loss statements, balance sheet, financial statements, accounting

description: Abstract Project management mainly aims to eliminate risks and improve service delivery. It is important to take into consideration project and corporate accounting when making project management decisions. For this reason, project managers need to have a basic understanding of key financial statements of a business and how each project affects the statement. This helps in the betterment of communication and cooperation between the financial departments and the project management professionals of a business. This also helps in making better decisions regarding to project management. This paper approaches an overview and explanation of key financial statements including the balance sheet, the cash flow statement and the income statement. It also gives a brief overview of key words of earned value management. The paper also gives brief examples on the effects of a project on each financial statement and suggestions on better project management decision making by considering both systems of accounting when making project decisions.
Laplacian flow of homogeneous G2-structures and its solitons
Creators: name: Lauret, Jorge
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: We use the bracket flow/algebraic soliton approach to study the Laplacian flow of $G_2$-structures and its solitons in the homogeneous case. We prove that any homogeneous Laplacian soliton is equivalent to a semi-algebraic soliton (i.e.\ a $G$-invariant $G_2$-structure on a homogeneous space $G/K$ that flows by pull-back of automorphisms of $G$ up to scaling). Algebraic solitons are geometrically characterized among Laplacian solitons as those with a `diagonal' evolution. Unlike the Ricci flow case, where any homogeneous Ricci soliton is isometric to an algebraic soliton, we have found, as an application of the above characterization, an example of a left-invariant closed semi-algebraic soliton on a nilpotent Lie group which is not equivalent to any algebraic soliton. The (normalized) bracket flow evolution of such a soliton is periodic. In the context of solvable Lie groups with a codimension-one abelian normal subgroup, we obtain long time existence for any closed Laplacian flow solution; furthermore, the norm of the torsion is strictly decreasing and converges to zero. We also classify algebraic solitons in this class and exhibit several explicit examples of closed expanding Laplacian solitons.
description: 33 pages, final version accepted in Proc. London Math. Soc
Quantum noise with exchange and tunneling: Predictions for a two-particle scattering experiment with time-dependent oscillatory potentials
Creators: name: Colomés, Enrique
name: Marian, Damiano
name: Oriols, Xavier
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum noise with exchange and tunneling is studied within time-dependent wave packets. A novel expression for the quantum noise of two identical particles injected simultaneously from opposite sides of a tunneling barrier is presented. Such quantum noise expression provides a physical (non-spurious) explanation for the experimental detection of two electrons at the same side under static potentials. Numerical simulations of the two-particle scattering probabilities in a double barrier potential with an oscillatory well are performed. The dependence of the quantum noise on the electron energy and oscillatory frequency are analyzed. The peculiar behaviour of the dependence of the quantum noise on such parameters is proposed as a test about the soundness of this novel quantum noise expression, for either static or oscillatory potentials.
description: 12 pages, 5 figures
Analyzing Neutron Star in HESS J1731-347 from Thermal Emission and Cooling Theory
Creators: name: Ofengeim, D. D.
name: Kaminker, A. D.
name: Klochkov, D.
name: Suleimanov, V.
name: Yakovlev, D. G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The central compact object in the supernova remnant HESS J1731-347 appears to be the hottest observed isolated cooling neutron star. The cooling theory of neutron stars enables one to explain observations of this star by assuming the presence of strong proton superfluidity in the stellar core and the existence of the surface heat blanketing envelope which almost fully consists of carbon. The cooling model of this star is elaborated to take proper account of the neutrino emission due to neutron-neutron collisions which is not suppressed by proton superfluidity. Using the results of spectral fits of observed thermal spectra for the distance of 3.2 kpc and the cooling theory for the neutron star of age 27 kyr, new constraints on the stellar mass and radius are obtained which are more stringent than those derived from the spectral fits alone.
description: 9 pages, 5 figures, MNRAS, accepted
Strategic Negotiation Using Facial Emotion Technique
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: FACIAL RECOGNITION, NEGOTIATION TECHNIQUES

description: Abstract Negotiation occurs daily in different societal levels with affect and emotions taking center stage in negotiation and other motivated performances. Many theories have been put that that posit that sufficient information on one’s internal affective state is revealed by facial expression. Contextual emotion hypothesis asserts that facial emotional perception is affected by situational factors. Other’s perception of one’s facial emotional display could be biased depending on these factors. Based on this hypothesis, one can have different facial displays of the same emotion as this depends on the context in which the emotion is expressed. This paper considers the automatic facial expression analysis problem and aims to propose a technological solution to it far from the traditional experiments and applications in the lab conditions and into the technological analysis in unconstrained conditions. Recent efforts in this direction have shown improvements but how to achieve an accurate, real-time, robust and informative facial expressional analysis still remains vague.
Anatomy of the Higgs fits: a first guide to statistical treatments of the theoretical uncertainties
Creators: name: Fichet, Sylvain
name: Moreau, Grégory
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The studies of the Higgs boson couplings based on the recent and upcoming LHC data open up a new window on physics beyond the Standard Model. In this paper, we propose a statistical guide to the consistent treatment of the theoretical uncertainties entering the Higgs rate fits. Both the Bayesian and frequentist approaches are systematically analysed in a unified formalism. We present analytical expressions for the marginal likelihoods, useful to implement simultaneously the experimental and theoretical uncertainties. We review the various origins of the theoretical errors (QCD, EFT, PDF, production mode contamination...). All these individual uncertainties are thoroughly combined with the help of moment-based considerations. The theoretical correlations among Higgs detection channels appear to affect the location and size of the best-fit regions in the space of Higgs couplings. We discuss the recurrent question of the shape of the prior distributions for the individual theoretical errors and find that a nearly Gaussian prior arises from the error combinations. We also develop the bias approach, which is an alternative to marginalisation providing more conservative results. The statistical framework to apply the bias principle is introduced and two realisations of the bias are proposed. Finally, depending on the statistical treatment, the Standard Model prediction for the Higgs signal strengths is found to lie within either the $68\%$ or $95\%$ confidence level region obtained from the latest analyses of the $7$ and $8$ TeV LHC datasets.
description: 62 pages, 10 figures
Limits of Riemannian 4-manifolds and the symplectic geometry of their twistor spaces
Creators: name: Fine, Joel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 53C21, 53C25, 53C28, 53D05

description: The twistor space of a Riemannian 4-manifold carries two almost complex structures, $J_+$ and $J_-$, and a natural closed 2-form $ω$. This article studies limits of manifolds for which $ω$ tames either $J_+$ or $J_-$. This amounts to a curvature inequality involving self-dual Weyl curvature and Ricci curvature, and which is satisfied, for example, by all anti-self-dual Einstein manifolds with non-zero scalar curvature. We prove that if a sequence of manifolds satisfying the curvature inequality converges to a hyperkähler limit X (in the $C^2$ pointed topology) then X cannot contain a holomorphic 2-sphere (for any of its hyperkähler complex structures). In particular, this rules out the formation of bubbles modelled on ALE gravitational instantons in such families of metrics.
description: 12 pages. v2 corollary 6 has been removed (a partial answer to a question of Biquard) since the "proof" was false. Some remarks have been added, some typos removed. This is the version accepted for publication by Transactions of the LMS
Education Practicum for Early Childhood Learning
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: early education, childhood education, education practicum, Yopp-singer test

description: Practicum A Developmental Stage Review The developmental stage is critical-literacy based along with the increase in language and literacy standards and testing when during early childhood education. Critical literacy is a crucial tool in teaching as a way of matching teaching, teaching materials and processes with the talents and needs of children. The stage requires the consideration and factoring in children’s points of view in early childhood literacy teaching through creation of literacy teaching that responds and empowers to children’s identities as a crucial way of understanding children and their learning needs as well as gaining insights and a way of learning for teachers. As a way of cultivating critical literacy is children's early education, one of the most viable strategies used is factoring discourse in teaching. Through this, the lived experiences of children and home discourses are included in the learning process in terms of the way the society around them things, does things, feels and acts about a range of issues and what it values. Another strategy is taking a critical perspective during teaching in which the read materials are assessed in the ways they look at issues and how they affect the lives, thoughts, and actions of children in their early education. Another strategy is a generative curriculum that looks into the needs in the communities and provides an outlet, a source of action or social justice.
The Archimedes experiment
Creators: name: Calloni, Enrico
name: Caprara, S.
name: De Laurentis, Martina
name: Esposito, Giampiero
name: Grilli, M.
name: Majorana, Ettore
name: Pepe, G. P.
name: Petrarca, S.
name: Puppo, Paola
name: Rapagnini, P.
name: Ricci, F.
name: Rosa, Luigi
name: Rovelli, Carlo
name: Ruggi, P.
name: Saini, N. L.
name: Stornaiolo, Cosimo
name: Tafuri, Francesco
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Archimedes is an INFN-funded pathfinder experiment aimed at verifying the feasibility of measuring the interaction of vacuum fluctuations with gravity. The final experiment will measure the force exerted by the gravitational field on a Casimir cavity whose vacuum energy is modulated with a superconductive transition, by using a balance as a small force detector. Archimedes is a two-year project devoted to test the most critical experimental aspects, in particular the balance resonance frequency and quality factor, the thermal modulation efficiency and the superconductive sample realization.
description: 4 pages, 2 figures
Probing MeV to 90 GeV axion-like particles with LEP and LHC
Creators: name: Jaeckel, Joerg
name: Spannowsky, Michael
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Axion-like particles (ALPs), relatively light (pseudo-)scalars coupled to two gauge bosons, are a common feature of many extensions of the Standard Model. Up to now there has been a gap in the sensitivity to such particles in the MeV to 10 GeV range. In this note we show that LEP data on $Z\toγγ$ decays provides significant constraints in this range (and indeed up to the $Z$-mass). We also discuss the sensitivities of LHC and future colliders. Particularly the LHC shows promising sensitivity in searching for a pseudo-scalar with $4 \lesssim m_a \lesssim 60$ GeV in the channel $pp \to 3 γ$ with $m_{3γ}\approx m_{Z}$.
description: 12 pages, 5 figures
Meaning Of Color in GUI Design - Comparison of Asian and Western Color Preferences
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: GUI design, user interface, software development, app development, western GUI design preference

description: Introduction The corporate choice of color of products, logos, packaging, services, and other collateral is crucial in creating and sustaining a brand and the corporate image. Global presence companies have to consider the target country culture for international success despite globalism as an emerging factor. These companies have to customize their marketing strategy to fit the target country's cultural background. Similarly, companies with a global online presence have to pay close attention to this by customizing their website designs. This research paper looks into the color preference of Chinese and Western cultures and their usage in GUI.
A Study of the Effects of Diet on Human Gut Microbial Community Structure and Mercury Metabolism
Creators: name: Saha, Ria
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2017
Subjects: Mercury (Hg)
Gut Microbiota Transformation

description: Background: Recent research showing how dietary interventions substantially influence the potential presence of widespread and stable bacterial core phyla in the human colon has garnered a considerable amount of attention. Because the human gut can play a major role in host health, there is currently some interest in observing how diet influences human gut microbial composition and how changes in diet affect the potential for gut microbiota to transform mercury. This study aims to discover how different kinds of diet affect the nature and magnitude of microbial Hg transformations in the human gut environment. Methods: Fecal samples have been collected from 5 human male individuals at University of Ottawa and stored at -80ºC for further investigation. Using high throughput DNA amplicon sequencing targeting the 16s rRNA V4 region, we investigated the microbial community structure of the gut in 5 healthy male. Mercury biotransformations in the pooled fecal sample have been carried out using stable isotopes of mercury (198HgCl2 and Me199HgCl) and analysis was conducted by using inductively coupled plasma mass spectrometry (ICP-MS). Results and conclusions: We were not able to detect any significant Hg methylation or MeHg demethylation. We suspect this is due to Enterobacteria dominating the microbial community structure after 96h; Although Enterobacteria are part of the typical microbiota of a healthy individual, they do not possess genes required for Hg methylation. As such, our microbial data support our chemical analyses. We were not able to identify whether a change in diet affected Hg transformations in the human gut environment.
The U.S. Coast Guard public affairs officer: roles, perceptions, and culture – a communication excellence study
Creators: name: Moorlag, Matthew J.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2007

description: U.S. Coast Guard missions have grown considerably since it transferred to the Department of Homeland Security (DHS). Using "best practices" from the excellence theory of public relations and high reliability organizational theory, this study examines whether the current structure of the U.S. Coast Guard public affairs program is sufficient to effectively provide a full spectrum of public affairs services over the range of activities that the service has been engaged in since transferring to DHS. Differences between two types of public affairs officers (PAO), primary duty PAOs and collateral duty PAOs are examined to provide insight into whether the U.S. Coast Guard has the right people in the right place to conduct excellent public affairs at the right time. Based on the survey research results with these two key groups, the researcher recommends creating the External Affairs Limited Duty Officer specialty and provides additional options to increase public affairs effectiveness.
Combined heart and liver transplantation: An updated systematic review of observational studies and proportional meta-analysis.
Creators: name: Frountzas, Maximos
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Medicine and Health Sciences
subject: Medical Specialties
subject: Surgery

description: Combined heart-liver transplantation (CHLT) is one of the most complex procedures of surgery, that has been implemented in the last 35 years, for the management of end-stage heart and/or liver failure, that are caused by several potentially lethal diseases. The aim of our meta-analysis is to investigate safety and efficacy of CHLT.
ACCOUNTING TREATMENT OF RESEARCH AND DEVELOPMENT
Creators: name: Amuga, Edwin O.
Publisher: name: Zenodo
Year: 2022
Subjects: Accounting, research and development in accounting, treatment of research and development costs in accounting, HGB, International Accounting Standards,

description: Organizations seeking to break even and remain afloat must effect research-based changes in areas ailing them. These changes can include top-down operational infrastructure changes with talent identification getting extended to the makeshift staff constituted from all parts and levels of the company to help mitigate the problems temporarily during these happenings. The changes though would follow the existing procedures of process mapping, cause analysis and cross-discipline cooperation and further improvement of processes and technology. For such changes to be effected, extensive research must be done and invested upon with long term positive outcomes for the improvement of service delivery. Despite the established importance of research and development in streamlining operations as well as growth, many companies still struggle to account costs invested in research and development. This paper looks into the international guidelines to the accounting treatment of research and development costs.