cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
QCD corrections to e^+ e^- to J/ψ(ψ(2S))+χ_{cJ} (J=0,1,2) at B Factories
Creators: name: Wang, Kai
name: Ma, Yan-Qing
name: Chao, Kuang-Ta
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analytically calculate the cross sections of double charmonium production in $e^+ e^- \to J/ψ(ψ(2S))χ_{cJ}$ (J=0,1,2) at next-to-leading order (NLO) in $α_s$ in nonrelativistic QCD, and confirm factorization of these processes. In contrast to $χ_{c0}$ production, for which the NLO correction is large and positive, the NLO corrections for $χ_{c1,2}$ production can be negative, resulting in decreased $K$ factors of 0.91 and 0.78 for J=1 and 2 respectively when $μ= 2 m_{c}$. Consequently, the NLO QCD corrections markedly enlarge the difference between cross sections of $χ_{c0}$ and $χ_{c1,2}$. This may explain why $e^+ e^- \to J/ψ(ψ(2S))χ_{c0}$ but not $e^+ e^- \to J/ψ(ψ(2S))χ_{c1,2}$ is observed experimentally. Moreover, for $J/ψ(ψ(2S))χ_{c1,2}$, the NLO QCD corrections substantially reduce the $μ$ dependence and lead to predictions with small theoretical uncertainties.
description: Version published in PRD, 6 pages, 3 figures, 2 tables, one reference added
The interstellar cosmic-ray electron spectrum from synchrotron radiation and direct measurements
Creators: name: Strong, A. W.
name: Orlando, E.
name: Jaffe, T. R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Context: The relation between Galactic cosmic-ray electrons, magnetic fields and synchrotron radiation. Aims: We exploit synchrotron radiation to constrain the low-energy interstellar electron spectrum, using various radio surveys and connecting with electron data from Fermi-LAT and other experiments. Methods: The GALPROP programme for cosmic-ray propagation, gamma-ray and synchrotron radiation is used. Secondary electrons and positrons are included. Propagation models based on cosmic-ray and gamma-ray data are tested against synchrotron data from 22 MHz to 94 GHz. Results: The synchrotron data confirm the need for a low-energy break in the cosmic-ray electron injection spectrum. The interstellar spectrum below a few GeV has to be lower than standard models predict, and this suggests less solar modulation than usually assumed. Reacceleration models are more difficult to reconcile with the synchrotron constraints. We show that secondary leptons are important for the interpretation of synchrotron emission. We also consider a cosmic-ray propagation origin for the low-energy break. Conclusions: Exploiting the complementary information on cosmic rays and synchrotron gives unique and essential constraints on electrons, and has implications for gamma rays. This connection is especially relevant now in view of the ongoing PLANCK and Fermi missions.
description: Accepted for publication in Astronomy and Astrophysics
Herschel Observations of the T Cha Transition Disk: Constraining the Outer Disk Properties
Creators: name: Cieza, Lucas A.
name: Olofsson, Johan
name: Harvey, Paul M.
name: Pinte, Christophe
name: Merin, Bruno
name: Augereau, Jean-Charles
name: Evans, Neal J.
name: Najita, Joan
name: Henning, Thomas
name: Menard, Francois
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: T Cha is a nearby (d = 100 pc) transition disk known to have an optically thin gap separating optically thick inner and outer disk components. Huelamo et al. (2011) recently reported the presence of a low-mass object candidate within the gap of the T Cha disk, giving credence to the suspected planetary origin of this gap. Here we present the Herschel photometry (70, 160, 250, 350, and 500 micron) of T Cha from the "Dust, Ice, and Gas in Time" (DIGIT) Key Program, which bridges the wavelength range between existing Spitzer and millimeter data and provide important constraints on the outer disk properties of this extraordinary system. We model the entire optical to millimeter wavelength spectral energy distribution (SED) of T Cha (19 data points between 0.36 and 3300 micron without any major gaps in wavelength coverage). T Cha shows a steep spectral slope in the far-IR, which we find clearly favors models with outer disks containing little or no dust beyond 40 AU. The full SED can be modeled equally well with either an outer disk that is very compact (only a few AU wide) or a much larger one that has a very steep surface density profile. That is, T Cha's outer disk seems to be either very small or very tenuous. Both scenarios suggest a highly unusual outer disk and have important but different implications for the nature of T Cha. Spatially resolved images are needed to distinguish between the two scenarios.
description: Accepted for publication in ApJ Letters
Matching of analytical and numerical solutions for neutron stars of arbitrary rotation
Creators: name: Pappas, George
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We demonstrate the results of an attempt to match the two-soliton analytical solution with the numerically produced solutions of the Einstein field equations, that describe the spacetime exterior of rotating neutron stars, for arbitrary rotation. The matching procedure is performed by equating the first four multipole moments of the analytical solution to the multipole moments of the numerical one. We then argue that in order to check the effectiveness of the matching of the analytical with the numerical solution we should compare the metric components, the radius of the innermost stable circular orbit ($R_{ISCO}$), the rotation frequency $Ω\equiv\frac{dϕ}{dt}$ and the epicyclic frequencies $Ω_ρ,\;Ω_z$. Finally we present some results of the comparison.
description: Contribution at the 13th Conference on Recent Developments in Gravity (NEB XIII), corrected typo in $M_4$ of eq. 5 of the published version
Fracture Relative Permeability Estimation by Lattice-Boltzmann Method and its Effect on SAGD Performance in Carbonate Reservoirs
Creators: name: Hu, Yi
Publisher: name: Graduate Studies
Year: 2017
Subjects: Engineering--Petroleum

description: Naturally fractured carbonate reservoirs with huge reserves are becoming more important to the global oil supply. It is of fundamental and practical importance to model naturally fractured reservoirs more accurately. So far, linear fracture relative permeability has been widely used for reservoir simulations. Extensive studies, however, have shown that fracture relative permeability varies with fracture characterizations. In this work, the Lattice Boltzmann Method (LBM) was applied to generate oil-water relative permeability of natural fractures under different fracture characterizations. In addition, the SAGD performance in naturally fractured carbonate reservoirs implemented with new relative permeability was evaluated. Results indicate that relative permeability in fractures presents a nonlinear relationship with saturation, rather than the commonly used X-shape curves. Comparing SAGD performance shows that it is necessary and more practical to utilize nonlinear relative permeability curves in natural fractures, especially for reservoirs with thin thickness, a medium level of matrix porosity and an initial oil saturation.
Parallel Tempered Metadynamics
Creators: name: Eichhorn, Timo
name: Fuwa, Gianluca
name: Hoelbling, Christian
name: Varnhorst, Lukas
Publisher: name: arXiv
Year: 2025
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: When approaching the continuum limit in lattice QCD or other theories in a setup with topological sectors, conventional update algorithms experience a particularly severe form of critical slowing down that is caused by high action barriers between the sectors. The qualitative scaling behavior of this critical slowing down appears to be universal across different update algorithms and (gauge) actions. We demonstrate that a combination of Metadynamics with parallel tempering, along with other modifications, can significantly reduce autocorrelation times while avoiding the need for reweighting. We also discuss strategies to extend the methods to QCD simulations with dynamical fermions, and present first results for $N_f = 2$ simulations at unphysical pion masses.
description: 21 pages, 8 figures. Proceedings of the 41st International Symposium on Lattice Field Theory (LATTICE2024), 28 July - 3 August 2024, Liverpool, UK v2: Matches PoS version
On the Fock Transformation in Nonlinear Relativity
Creators: name: Bouda, A.
name: Foughali, T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we propose a new deformed Poisson brackets which leads to the Fock coordinate transformation by using an analogous procedure as in Deformed Special Relativity. We therefore derive the corresponding momentum transformation which is revealed to be different from previous results. Contrary to the earlier version of Fock's nonlinear relativity for which plane waves cannot be described, our resulting algebra keeps invariant for any coordinate and momentum transformations the four dimensional contraction $p_μ x^μ $, allowing therefore to associate plane waves for free particles. As in Deformed Special Relativity, we also derive a canonical transformation with which the new coordinates and momentum satisfy the usual Poisson brackets and therefore transform like the usual Lorentz vectors. Finally, we establish the dispersion relation for Fock's nonlinear relativity.
description: 10 pages, no figures
Two-by-two ordinal patterns in art paintings
Creators: name: Tarozo, Mateus M.
name: Pessa, Arthur A. B.
name: Zunino, Luciano
name: Rosso, Osvaldo A.
name: Perc, Matjaz
name: Ribeiro, Haroldo V.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Quantitative analysis of visual arts has recently expanded to encompass a more extensive array of artworks due to the availability of large-scale digitized art collections. Consistent with formal analyses by art historians, many of these studies highlight the significance of encoding spatial structures within artworks to enhance our understanding of visual arts. However, defining universally applicable, interpretable, and sufficiently simple units that capture the essence of paintings and their artistic styles remains challenging. Here we examine ordering patterns in pixel intensities within two-by-two partitions of images from nearly 140,000 paintings created over the past thousand years. These patterns, categorized into eleven types based on arguments of continuity and symmetry, are both universally applicable and detailed enough to correlate with low-level visual features of paintings. We uncover a universal distribution of these patterns, with consistent prevalence within groups, yet modulated across groups by a nontrivial interplay between pattern smoothness and the likelihood of identical pixel intensities. This finding provides a standardized metric for comparing paintings and styles, further establishing a scale to measure deviations from the average prevalence. Our research also shows that these simple patterns carry valuable information for identifying painting styles, though styles generally exhibit considerable variability in the prevalence of ordinal patterns. Moreover, shifts in the prevalence of these patterns reveal a trend in which artworks increasingly diverge from the average incidence over time; however, this evolution is neither smooth nor uniform, with substantial variability in pattern prevalence, particularly after the 1930s.
description: 18 two-column pages, 6 figures, supplementary information; accepted for publication in PNAS Nexus
Waste heat as a driver for greenfield heat networks? Planning trade-offs illustrated using a case study for Zelzate, Belgium
Creators: name: Pollmann, Aljoscha
name: Aydemir, Ali
name: Fritz, Markus
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2022
Subjects: District heating
Heat transition

description: Many studies see district heating (DH) as an important lever to reduce greenhouse gas emissions in the building sector. Here, excess heat can drive the development of new heating networks in greenfield developments. However, determining the optimal size of a new network presents a question: should it be constructed to fully utilize waste heat, maximize project NPV, or connect as many buildings as possible? Consequently, tradeoffs may arise during planning. For instance, the size of a network has implications on investments and heat losses due to increased piping. In short, smaller networks result in lower heat losses and investments, while larger networks benefit more households. We investigate this trade-off in a Belgian municipality that considers options for building a new DH network utilizing excess heat from a nearby steel mill. We investigate the mentioned trade-off using THERMOS, a tool to design and simulate DH networks. To achieve this goal, we create three network designs that connect a different number of buildings to the DH network to be built in Zelzate (Belgium), each with unrefurbished or refurbished demand - resulting in six technical scenarios. Using indicators such as heat distribution costs and excess heat share in the DH network, we compare and evaluate the results of these simulations. 110 Our results indicate that the designs analyzed have their specific advantages and disadvantages. For example, heat distribution costs are significantly lower for designs where fewer buildings are connected than for designs where more buildings are connected. For example, the heat distribution costs for the unrefurbished scenario, where 30% of the demand is connected, are about 4.3 ct/kWh; for the design where 100% is connected, they are about 6.9 ct/kWh. In summary, our case study indicates that the aforementioned trade-off in greenfield planning is indeed relevant. For example, in the case study analysed, project developers tend to choose planning approaches where fewer buildings are connected, although larger networks could also be beneficial in the future. Therefore, further research is needed to find out which planning heuristics, technologies and/or strategies could help to deal with such trade-offs.
Understanding preferences for climate change adaptation for protected areas : the psychology of individual risk perceptions
Creators: name: Tam, Jordan Yukho
Publisher: name: University of British Columbia
Year: 2010

description: Protected areas (PAs) are a cornerstone of conservation strategy and investment. Unfortunately, climate change and its impacts will render many PAs less effective at safeguarding the species and ecosystems they were designed to protect. To cope with climate change, a number of adaptations for conservation management have been proposed. However, adaptation responses are not without risks. One way to consider the problem of adaptation is as an issue of risk management. In this vein, identifying the factors that shape risk perceptions and the acceptability of those risks is a key question for conservation. To assess whether greater certainty of future climate change and negative feelings are significant factors in determining risk perceptions and acceptability, a 2x2 factorial experiment was conducted via online surveys. Environmental worldviews were also measured using the New Ecological Paradigm (NEP) scale. The experimental design largely failed to produce any detectable effects. In general however, a high tolerance for adaptations was observed. This study also found that adaptation policies appeared to sit along a continuum of risk and of acceptability, which were also significantly and negatively correlated. The most acceptable and least risky policies tended to be those most similar to current conservation practices. Overall, people who had more pro-environmental worldviews (as revealed by higher NEP scores) perceived all adaptations as being equally risky or more risky than people with lower NEP scores. However, despite more pessimistic risk perceptions, high NEP scorers found three policies more acceptable than the low NEP group. These findings appear to support the central tenet of Cultural Cognition theory that risk perceptions are manifestations of personal beliefs and values. Additionally, there was evidence (though non-significant) that people who were fearful and angry saw adaptations as generally more risky and less acceptable than calm individuals. Certainty of climate change did not appear to have much influence on risk perceptions and acceptability. Though more research is needed to make concrete policy recommendations, this study does suggest that risk perceptions matter in shaping people’s willingness to support adaptation and should be a focus of conservation managers.
Biophysical Characterization of Nanoparticle Interactions with Lung Surfactant Models for Enhanced Pulmonary Drug Delivery
Creators: name: Lai, Patrick
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Biophysics
subject: Biophysics
subject: nanoparticles
subject: Lung Surfactant

description: Inhalable nanoparticles for drug delivery has shown promising results in the treatment of lung disease. The impact of these small sized drug carriers on the lungs is remains unclear. One of the first barriers that nanoparticles will encounter upon inhalation is the lung surfactant that lines each alveolus. This is a single molecule layer of lipids and proteins that forms at the air-water interface on top of the alveolar lining fluid. Its main role is to lower surface tension preventing the collapse of the alveoli during the breathing cycle. Impairing surfactant function results in collapse of the alveolar sacs leading to respiratory distress. The aim of the thesis was to use in vitro studies to identify which components of lung surfactant that are potentially impacted or influenced by the presence of nanoparticles. This was conducted using a model system for lung surfactant made up for phosphatidylcholine, phosphatidylglycerol and the neutral lipid cholesterol. This was compared to a clinical surfactant BLES that is used in surfactant replacement therapy. Surface activity was measured using a Langmuir trough with two Teflon barriers to mimic the air-water interface and compress the surfactant monolayer. Imaging of the monolayer was conducted with Brewster angle microscopy to visualize changes in the organization of the surfactant models. Gelatin and polyisobutylcyanoacrylate nanoparticles are both biocompatible materials that have been tested for inhalable drug delivery and are used in these experiments. In vitro testing was done to evaluate three different methods of adding nanoparticles to the surfactant monolayer to develop a better in vitro model to study nanoparticle surfactant interactions. These nanoparticles were either mixed with surfactant before application on the trough, added to the subphase or sprayed from the air as dry powder. Cholesterol was found to play a major role in nanoparticle-surfactant interactions by enhancing the formation of spike-like structures from the surfactant monolayer. The Langmuir trough was shown to be a useful tool for studying in vitro interactions. Further optimization of the spraying dry powder nanoparticles onto the Langmuir trough can potentially be a useful tool in vitro tool to predict potentially harmful in vivo effects
The phase diagram of water from quantum simulations
Creators: name: McBride, Carl
name: Noya, Eva G.
name: Aragones, Juan L.
name: Conde, Maria M.
name: Vega, Carlos
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The phase diagram of water has been calculated for the TIP4PQ/2005 model, an empirical rigid non-polarisable model. The path integral Monte Carlo technique was used, permitting the incorporation of nuclear quantum effects. The coexistence lines were traced out using the Gibbs-Duhem integration method, once having calculated the free energies of the liquid and solid phases in the quantum limit, which were obtained via thermodynamic integration from the classical value by scaling the mass of the water molecule. The resulting phase diagram is qualitatively correct, being displaced to lower temperatures by 15-20K. It is found that the influence of nuclear quantum effects are correlated to the tetrahedral order parameter.
description: 10 pages, 6 figures, 1 table
Impact of Point Bar Architecture on the Performance of SAGD
Creators: name: Su, Yi
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences
subject: Engineering--Petroleum
subject: Steam-Assisted Gravity Drainage (SAGD)
subject: Point Bar Deposit
subject: Inclined Heterolithic Strata (IHS)
subject: Athabasca Oilsand
subject: Flow Control Devices

description: The oil sands deposits of Western Canada are among the largest petroleum resource in the world but face challenges with respect to production due to complex geology and high oil viscosity. In the Athabasca oil sands deposit, the largest of the three main deposits in the province of Alberta, the viscosity of the oil at original reservoir conditions is typically over 1 million cP. Another key complexity of the Athabasca resource is the geology of the reservoirs which are often situated in point bar depositional environments. To produce these reservoirs, given their low solution gas content and other natural drive mechanisms, Steam-Assisted Gravity Drainage (SAGD) is the method of choice. The research presented here examines the impact of point bar architecture on the performance of SAGD; this subject has been explored by very few in the literature and yet an understanding of the geology of the formation is fundamental to the performance of SAGD. Four different research elements are explored. The first element deals with the impact of well placement within the point bar. The second element consists of an examination of the impact of orientation of a pad of SAGD wellpairs on its performance within the point bar system. The third element explores the use of dual steam injection tubing strings on the performance of SAGD in a point bar system. The fourth element explores the impact of steam outflow control devices placed within injection wells on the performance of SAGD wellpairs. The key outcomes of the research are first, the construction of a set of ultra-refined point bar geological models for evaluation of SAGD and other recovery processes and an understanding of the heterogeneities faced by SAGD in these systems; second, evaluation of the impact of point bar architecture on the performance of SAGD; and third, dual tubing string steam injectors, inflow control devices can be used to improve the performance of SAGD. By developing a better understanding of how SAGD is impacted by the geology of the oil sands reservoir, oil rates, recovery factor, and thermal efficiency can be improved for these systems.
title: Congestion control of robotic swarms in the common target problem
title: Theory and algorithms
titleType: Subtitle
Creators: name: Passos, Yuri Tavares
Publisher: name: Lancaster University
Year: 2023

description: The common target problem in robotic swarms occurs when every robot must visit the same target region. This may happen when a swarm of robots has to collect a leaked toxic substance, for instance. To minimise congestion in such a situation, coordination algorithms for traffic control are required. This thesis presents a mathematical study about measures for evaluating the access efficiency of a common target area as the number of robots in the swarm rises: the target area throughput and the asymptotic throughput. Based on them, two algorithms were developed: the Single Queue Former (SQF) and the Touch and Run Vector Fields (TRVF). I also present approaches for ad hoc robots (i.e., those unaware of the coordination algorithm used by others) without having to learn about them: the Ad Hoc Follower (AHF) and the Mixed Teams (MT). Surprisingly, between the proposed approaches, simply executing an alternative algorithm is better than following another robot perceived by local sensors. In the tests performed in the Stage simulator, the other robots can use SQF or TRVF. These algorithms are tested as alternative algorithms in addition to no coordination (NC), where the robots only go directly to the target and avoid bumping each other. SQF significantly outperforms all algorithms for a higher number of robots or when the circular target region radius is small. Estimations of the expected task completion time for the presented algorithms are also studied. These estimations consider not only the number of robots as input but also environmental and algorithmic global variables, such as the common target area size, the average speed and the average distance between the robots. This work is a fundamental first step to start a discussion on how better approximations can be achieved and which mathematical theories about local-to-global analysis are better suited to this problem.
title: From Houses of Worship to Worship in Houses: The Social Construction of Sacred Places in Early 21st Century China
Creators: name: Zhang, Yi
Publisher: name: UNSPECIFIED
Year: 2023

description: While the concept of worship in houses can be traced back to the Christian house church places in Dura Europos between 233 and 256 AD during the Roman Empire, after the foundation of the People's Republic of China in 1949, this kind of church spaces began to appear all across the country. Characterized by the absence of a formal iconic church building or interior, existing types of secular architectural spaces (apartments, offices, basements, etc.) were rented by the Christian community and converted into sacred spaces. Space is susceptible to manipulations caused by human actions. Now what happens if space is manipulated to house not merely a different function but transcendence? As French Marxist philosopher and sociologist Henri Lefebvre's argument in The Production of Space (1991), space is not only a social product but also a complex social construction, based on values and the social production of meanings, which affects spatial practices and perceptions. An existing space, he says, may outlive its original purpose and the raison d'étre which initially determined its forms, functions, and structures; it may thus, in a sense, become vacant and susceptible to being diverted, re-appropriated, and utilized for a different purpose than its original intent. With my analysis of the worship places of urban house churches in early 21st-century China from the perspective of urban context and architectural space (foregrounded by the development of informal church space in the historical context of Chinese society and politics), this research shows how religious metaphors function as the productive mediators in the process of knowledge transfer between architectural and other professional discourses by bringing back social imagination to the politically neutral spaces of every day; de facto reconstructing the social through transduction of the metaphor of informal spaces.
Faculty Mentorship: A Comparative Case Study of Factors Associated with Academic Career Mentoring Programs
Creators: name: Lorenzetti, Diane Louise
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Education--Adult and Continuing
subject: Mentorship
subject: Professional Development
subject: Faculty development

description: Informal mentoring has long been a means of facilitating the transfer of knowledge, skills, and experience from senior to junior faculty. Although many continue to benefit from these relationships, others report that they lack mentorship. Formal mentoring programs are structured interventions designed to provide equitable access to mentorship. While previous research suggests that such programs can further professional development and career outcomes in academia, few studies have examined those factors which may impact on the success of these initiatives. The purpose of this dissertation study was to enhance conceptual understanding of faculty-to-faculty mentorship by exploring how academics perceive their roles, benefit from, and are challenged by their participation in formal programs. I employed a comparative qualitative dual case study approach to conduct an in-depth examination of the faculty mentoring experience. Faculty mentorship was explored against the backdrop of two emerging programs at the University of Calgary (Alberta, Canada): one a functional dyadic structure, the other a peer group model. This research was informed by data from 23 semi-structured interviews, program documentation, and observational field notes. Faculty share many similar beliefs, and concerns, with respect to mentorship, and their participation in, and satisfaction with, formal mentoring programs. Chief among these are an intrinsic belief in comfort, safety, and trust as innate attributes of mentorship, and an awareness that formal programs may do little to support the development of that depth of intimacy and trust that faculty associate with these relationships. While faculty appear to view mentorship as an inherent good, tensions can arise when they feel unprepared, and unsupported, in their efforts to engage in these relationships. In this study, I found that a lack of training, clear expectations, and dedicated time were key barriers to mentorship participation. My analysis further revealed that organizational cultures and priorities can influence attitudes towards, and participation in, these relationships. Efforts to address these educational, program-level, and organizational impediments may enable faculty to derive greater benefit from these experiences. Finally, my analysis of study findings informed the development of a best-practice framework for conceptualizing the design, implementation, and evaluation of faculty mentorship programs.
Production Planning and Control for Flexible Interim Product Manufacturing in One-of-a-Kind Production
Creators: name: Ying, Mei
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Engineering--Industrial
subject: workforce allocation
subject: production control
subject: flexible manufacturing

description: One-of-a-kind production (OKP) is generally complex flexible production which is characterized by discrete and non-numerical production decomposition, product design uncertainty and changes in resource availability. The old production management and control system, theory and methods do not handle this situation well because these technologies are developed with a view to time-invariant or static production state in the traditional large batch size manufacturing companies. Considering the manufacturing project (i.e. production planning and execution process) of OKPs as the main line of research, and by clarifying the optimal control and operational management of interim product production from a viewpoint of control system, we aim at analyzing the relationship between the control system actions and the crucial production indices that characterize working time expenditure, man hour cost and workforce consumption; and developing a closed-loop dynamic production cost control and optimization system of interim products based on working hours and manpower for OKP. The research involves the following aspects: First: A method for workforce allocation and working time optimization problem with discrete and non-numerical constraints in OKP. With a top-down refinement method to specialize the product design and production decomposition in OKP, we suggest three unit task structures. For the typical double-level-nested parallel structure, according to analysis of complex industrial scenarios, a discrete-nested-set DP (dynamic programming) is presented to solve the workforce allocation and working time optimization problem. Second: The optimal control methods based on MLHPP (the multilevel hierarchical PERT-Petri net) are proposed to analyze dynamic interim production cost control and optimization under different workforce allocation and working time scenarios in a closed-loop control system. Third: Entropy-weighted ANP fuzzy comprehensive evaluation of interim product production processes in OKP. OKP interim product production has the nature of multi-criteria production. To optimize the production processes influenced by complex factors, we establish an influence factor system and present a method that combines subjective and objective weights based on the entropy and an analytic network process (ANP).
Multi-scale magnetic study on Ni(111) and graphene on Ni(111)
Creators: name: Dzemiantsova, L. V.
name: Karolak, M.
name: Lofink, F.
name: Kubetzka, A.
name: Sachs, B.
name: von Bergmann, K.
name: Hankemeier, S.
name: Wehling, T. O.
name: Frömter, R.
name: Oepen, H. P.
name: Lichtenstein, A. I.
name: Wiesendanger, R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have investigated the magnetism of the bare and graphene-covered (111) surface of a Ni single crystal employing three different magnetic imaging techniques and ab initio calculations, covering length scales from the nanometer regime up to several millimeters. With low temperature spinpolarized scanning tunneling microscopy (SP-STM) we find domain walls with widths of 60 - 90 nm, which can be moved by small perpendicular magnetic fields. Spin contrast is also achieved on the graphene-covered surface, which means that the electron density in the vacuum above graphene is substantially spin-polarized. In accordance with our ab initio calculations we find an enhanced atomic corrugation with respect to the bare surface, due to the presence of the carbon pz orbitals and as a result of the quenching of Ni surface states. The latter also leads to an inversion of spinpolarization with respect to the pristine surface. Room temperature Kerr microscopy shows a stripe like domain pattern with stripe widths of 3 - 6 μm. Applying in-plane-fields, domain walls start to move at about 13 mT and a single domain state is achieved at 140 mT. Via scanning electron microscopy with polarization analysis (SEMPA) a second type of modulation within the stripes is found and identified as 330 nm wide V-lines. Qualitatively, the observed surface domain pattern originates from bulk domains and their quasi-domain branching is driven by stray field reduction.
Individual, Organizational and Interactional Determinants of Employee Turnover: A longitudinal Study Testing a New Model of Voluntary Employee Turnover
Creators: name: Mayers, David
Publisher: name: Graduate Studies
Year: 2013
Subjects: subject: Industrial
subject: voluntary turnover
subject: Person-organization fit
subject: job satisfaction
subject: personnel selection

description: The purpose of this study was to examine person-organization (P-O) fit within a longitudinal model predicting voluntary turnover. Data was collected from a sample of 477 part time employees working in a wide variety of organizations. Results indicated that indirect (P-O) fit can be used within a model of voluntary employee turnover. Indirect subjective P-O fit had a main effect on job satisfaction partially mediated by perceived fit. Job satisfaction reliably classified voluntary turnover within 12 months. The relationship between job satisfaction and voluntary turnover was partially mediated by job search behaviour. Post hoc analysis indicated that perceived fit also had a direct relationship with voluntary turnover partially mediated by job search behaviour. Further analysis showed the incremental variance accounted for in perceived fit using polynomial regression analysis as an alternative to difference scores. Strengths, limitations and suggestions for future research are discussed.
Leading order infrared quantum chromodynamics in Coulomb gauge
Creators: name: Watson, Peter
name: Reinhardt, Hugo
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A truncation scheme for the Dyson-Schwinger equations of quantum chromodynamics in Coulomb gauge within the first order formalism is presented. The truncation is based on an Ansatz for the Coulomb kernel occurring in the action. Results at leading loop order and in the infrared are discussed for both the Yang-Mills and quark sectors. It is found that the resulting equations for the static gluon and quark propagators agree with those derived in a quasi-particle approximation to the canonical Hamiltonian approach. Moreover, a connection to the heavy quark limit is established. The equations are analyzed numerically and it is seen that in both the gluonic and quark sectors, a nontrivial dynamical infrared mass scale emerges.
description: 27 pages, 11 figures
From Delegation to Limits on Presidential Power: Brazil in Comparative Perspective
Creators: name: Hipólito Ramos Mota, Mariana
Publisher: name: Graduate Studies
Year: 2017
Subjects: subject: Political Science
subject: FOS: Political science
subject: Democracy
subject: Corruption
subject: Institutionalization
subject: Delegative Democracy

description: In the early 1990s, observers noted that many new democracies had free and fair elections, while at the same time concentrating power in the executive’s hands. Guillermo O’Donnell (1994) labeled these regimes “delegative democracies” to denote a hybrid system in which the president is considered to be the “saviour” who can govern “above all.” In his view, presidents of such democracies could ignore weak or inexistent institutional checks on their power. And given the lack of incentives for leaders to limit their power, it was unlikely that institutional checks could ever emerge. He anticipated that the future of these democracies was not a bright one, with only two viable options: to remain delegative or follow an even more authoritarian path. Yet despite this pessimistic outlook, Brazil did the improbable: although it was a delegative democracy under President Fernando Collor in the early 1990s, it has seen limits to presidential power emerge in the decades since then. This thesis examines how and why such institutional checks were created in Brazil. I argue that institutional checks emerge because self-limitation becomes the most rational choice for presidents of these democracies when they face a growing uncertainty concerning their future in power. In the case of Brazil, President Collor was impeached in 1992 because he underestimated the uncertainty of his position, governing above all and ignoring the political elite. His impeachment, along with his involvement in a corruption scandal, triggered the creation of limits to presidential power. A comparison between Brazil and other democracies that were once considered delegative—namely Venezuela, Argentina, and Russia—confirms that if a delegative democracy is to last, presidents cannot govern above all, as once thought. If they do so, it will come at the cost of democracy as they will become even more authoritarian rulers. The examination of Brazil’s democracy shows that presidents of delegative democracies are far from unconstrained and “above-all” rulers. Institutional limits to presidential power, ironically, were created in Brazil because a president governed as if he could indeed ignore all political players and bypass all obstacles to his power.
THE IMPACT OF SOCIAL MEDIA ON ENGLISH  LANGUAGE USAGE
Creators: name: Academic supervisor: Ismailov Anvar Rustamovich Dean of the Faculty of English Philology and Translation Studies Student: Ismoilova Shaxzoda Isroilovna Student of Samarkand State Institute of Foreign Language
Publisher: name: Zenodo
Year: 2025

description: In the modern era of advanced information technology, social media has become an integral part of daily life, playing a crucial role in facilitating communication. Platforms individuals to interact quickly and efficiently. Notably, social media has a profound impact on language acquisition and usage. As English continues to serve as the primary global means of communication, social media significantly contributes to its widespread adoption, development, and simplification, making it more accessible to a broader audience. This article provides a comprehensive analysis of the impact of social media on the English language, focusing on the new opportunities it creates and the structural and stylistic changes it induces. Through a scholarly examination, the study explores how social media contributes to the incorporation of new vocabulary and expressions into English, alters communication patterns, and enhances the language’s adaptability for a global audience.
Continuous transitions between composite Fermi liquid and Landau Fermi liquid: a route to fractionalized Mott insulators
Creators: name: Barkeshli, Maissam
name: McGreevy, John
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: One of the most successful theories of a non-Fermi liquid metallic state is the composite Fermi liquid (CFL) theory of the half-filled Landau level. In this paper, we study continuous quantum phase transitions out of the CFL state and into a Landau Fermi liquid, in the limit of no disorder and fixed particle number. This transition can be induced by tuning the bandwidth of the Landau level relative to the interaction energy, for instance through an externally applied periodic potential. We find a transition to the Landau Fermi liquid through a gapless Mott insulator with a Fermi surface of neutral fermionic excitations. In the presence of spatial symmetries, we also find a direct continuous transition between the CFL and the Landau Fermi liquid. The transitions have a number of characteristic observable signatures, including the presence of two crossover temperature scales, resistivity jumps, and vanishing compressibility. When the composite fermions are paired instead, our results imply quantum critical points between various non-Abelian topological states, including the ν= 1/2 Moore-Read Pfaffian (Ising x U(1) topological order), a version of the Kitaev B phase (Ising topological order), and paired electronic superconductors. To study such transitions, we use a projective construction of the CFL, which goes beyond the conventional framework of flux attachment to include a broader set of quantum fluctuations. These considerations suggest a possible route to fractionalized Mott insulators by starting with FQH states and tuning the Landau level bandwidth.
description: 15 pages
Classifying the Isolated Zeros of Asymptotic Gravitational Radiation by Tendex and Vortex Lines
Creators: name: Zimmerman, Aaron
name: Nichols, David A.
name: Zhang, Fan
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A new method to visualize the curvature of spacetime was recently proposed. This method finds the eigenvectors of the "electric" and "magnetic" components of the Weyl tensor and, in analogy to the field lines of electromagnetism, uses the eigenvectors' integral curves to illustrate the spacetime curvature. Here we use this approach, along with well-known topological properties of fields on closed surfaces, to show that an arbitrary, radiating, asymptotically flat spacetime must have points near null infinity where the gravitational radiation vanishes. At the zeros of the gravitational radiation, the field of integral curves develops singular features analogous to the critical points of a vector field. We can, therefore, apply the topological classification of singular points of unoriented lines as a method to describe the radiation field. We provide examples of the structure of these points using linearized gravity and discuss an application to the extreme-kick black-hole-binary merger.
description: 10 pages, 10 figures. Changed to reflect published version, sign errors fixed
Additional file 1 of Machine learning-based MRI radiomics for assessing the level of tumor infiltrating lymphocytes in oral tongue squamous cell carcinoma: a pilot study
Creators: name: Ren, Jiliang
name: Yang, Gongxin
name: Song, Yang
name: Zhang, Chunye
name: Yuan, Ying
Publisher: name: figshare
Year: 2024
Subjects: subject: Space Science
subject: Cell Biology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Cancer
subject: Plant Biology
subject: FOS: Biological sciences

description: Supplementary Material 1
The Disp Method for Analysing Large Zenith Angle Gamma-Ray Data
Creators: name: Şentürk, G. D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Disp method is an algorithm that is used for reconstruction of primary gamma ray direction in ground- based atmospheric Cherenkov telescope experiments -measuring very-high-energy (VHE) gamma rays in the energy range between 100GeV and 30 TeV. In general terms, the geometric information obtained from one single shower image is sufficient for the algorithm to find the sky location of the primary. Various versions of the Disp method were implemented and used in the past. In this study, we present a multi-dimensional implementation of the Disp method for the VERITAS instrument and show (using Monte Carlo simulations and the Crab Nebula observations) that it significantly improves the angular resolution for large-zenith-angle (LZA) observations. We also applied the disp method to VERITAS data taken from the galactic center region which is detected by VERITAS.
description: 3 pages, 5 figures, to appear in proceedings of the 32nd ICRC, Beijing, China
Design, Construction, and Calibration of a Vibrating Tube Densimeter for Volumetric Measurements of Acid Gas Fluids
Creators: name: Deering, Connor Edward
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Chemistry--Analytical
subject: Chemistry--Physical
subject: Engineering--Chemical
subject: Vibrating Tube Densimetry
subject: Density
subject: Carbon Dioxide
subject: Water
subject: Volumetric Properties
subject: Krichevskii Parameter
subject: Acid Gas Injection
subject: Experimental Thermodynamics
subject: Physical Chemistry
subject: Analytical Chemistry
subject: FOS: Chemical sciences
subject: Supercritical Fluids
subject: High-Pressure Fluids

description: Volumetric changes are vital to understanding the high-pressure chemical thermodynamics within acid gas injection processes. In this study, a vibrating tube densimeter was constructed and calibrated in order to perform volumetric measurements on acid gas fluids where previous literature were sparse. The densimeter uses an optically coupled feedback loop in order to maintain a fluid filled vibrating tube at its harmonic frequency. The densimeter is capable of measuring densities at temperatures between T = 25 and 150 °C and pressures up to p = 35 MPa (5076 psia). Densities of pure carbon dioxide and water dissolved in carbon dioxide at low concentrations were measured and used to calculate partial molar volumes at temperatures between T = 45 and 120 °C and pressures up to p = 35 MPa for use in equilibrium or fugacity calculations. The Krichevskii parameter for water’s influence on carbon dioxide’s critical behaviour was determined using the partial molar volume measurements.