cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Idempotent generation in the endomorphism monoid of a uniform partition
Creators: name: Dolinka, Igor
name: East, James
Publisher: name: arXiv
Year: 2014
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20M20, 20M17

description: Denote by $\mathcal T_n$ and $\mathcal S_n$ the full transformation semigroup and the symmetric group on the set $\{1,\ldots,n\}$, and $\mathcal E_n=\{1\}\cup(\mathcal T_n\setminus \mathcal S_n)$. Let $\mathcal T(X,\mathcal P)$ denote the set of all transformations of the finite set $X$ preserving a uniform partition $\mathcal P$ of $X$ into $m$ subsets of size $n$, where $m,n\geq2$. We enumerate the idempotents of $\mathcal T(X,\mathcal P)$, and describe the subsemigroup $S=\langle E\rangle$ generated by the idempotents $E=E(\mathcal T(X,\mathcal P))$. We show that $S=S_1\cup S_2$, where $S_1$ is a direct product of $m$ copies of $\mathcal E_n$, and $S_2$ is a wreath product of $\mathcal T_n$ with $\mathcal T_m\setminus \mathcal S_m$. We calculate the rank and idempotent rank of $S$, showing that these are equal, and we also classify and enumerate all the idempotent generating sets of minimal size. In doing so, we also obtain new results about arbitrary idempotent generating sets of $\mathcal E_n$.
description: 17 pages, 6 figure, 6 tables - v2 includes some minor corrections and simplifications suggested by referee - to appear in Comm Alg
An Examination of Attitudes toward Bisexual People at the Intersections of Gender and Race/Ethnicity
Creators: name: Feinstein, Brian A.
name: Benjamin, Isabel
name: Dorrell, Kate D.
name: Foley, Sydni E.
name: Blumenau, Helena S.
name: Cragun, Ryan T.
name: Manalastas, Eric Julian
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: 111714 Mental Health
subject: FOS: Health sciences

description: People report more negative attitudes toward bisexual than gay/lesbian individuals, but little is known about attitudes at the intersections of gender and race/ethnicity. We examined whether attitudes toward bisexual people differed depending on: 1) target gender identity (man, woman), gender modality (cisgender, transgender), and race/ethnicity (White, Black, Hispanic); and 2) participant gender identity (man, woman) and race/ethnicity (White, person of color). As part of a cross-sectional survey, 552 participants rated their feelings toward 12 bisexual targets who varied in gender identity/modality and race/ethnicity. A repeated-measures ANOVA indicated that participants rated bisexual men more negatively than bisexual women, transgender bisexual individuals more negatively than cisgender bisexual individuals, and Black/Hispanic bisexual individuals more negatively than White bisexual individuals. However, differences based on target gender identity and race/ethnicity were only observed for cisgender targets, and most effects were only observed for male participants. Efforts to improve attitudes toward bisexual people must account for heterogeneity based on target/participant characteristics.
Geometry and stability of tautological bundles on Hilbert schemes of points
Creators: name: Stapleton, David
Publisher: name: arXiv
Year: 2014
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J60

description: The purpose of this paper is to explore the geometry and establish the slope stability of tautological vector bundles on Hilbert schemes of points on smooth surfaces. By establishing stability in general we complete a series of results of Schlickewei and Wandel who proved the slope stability of these vector bundles for Hilbert schemes of 2 points or 3 points on K3 or abelian surfaces with Picard group restrictions. In exploring the geometry we show that every sufficiently positive semistable vector bundle on a smooth curve arises as the restriction of a tautological vector bundle on the Hilbert scheme of points on the projective plane. Moreover we show the tautological bundle of the tangent bundle is naturally isomorphic to the sheaf of vector fields tangent to the divisor which consists of nonreduced subschemes.
description: This paper is a substantial revision of arXiv:1409.8229v1
Uncertainty in Prosocial Behavior
Creators: name: Hailing, Zhao
name: Yashi, Xu
name: Fang, Cui
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Cognitive Psychology
subject: Psychology
subject: FOS: Psychology
subject: Social Psychology
subject: uncertainty
subject: prosocial decision-making
subject: empathy

description: This study will take uncertainty as object to find its role in prosocial decision-making.
Deformation effects in Giant Monopole Resonance
Creators: name: Kvasil, J.
name: Nesterenko, V. O.
name: Repko, A.
name: Bozik, D.
name: Kleinig, W.
name: Reinhard, P. -G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The isoscalar giant monopole resonance (GMR) in Samarium isotopes (from spherical $^{144}$Sm to deformed $^{148-154}$Sm) is investigated within the Skyrme random-phase-approximation (RPA) for a variety of Skyrme forces. The exact RPA and its separable version (SRPA) are used for spherical and deformed nuclei, respectively. The quadrupole deformation is shown to yield two effects: the GMR broadens and attains a two-peak structure due to the coupling with the quadrupole giant resonance.
description: 6 pages, 4 figures, proceedings of 11th Intern. Spring Seminar on Nuclear Physics (Ischia, Italy, May 12-16, 2014)
Polarised radio filaments outside the Galactic plane
Creators: name: Vidal, Matias
name: Dickinson, C.
name: Davies, R. D.
name: Leahy, J. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We used data from the \wmap satellite at 23, 33 and 41 GHz to study the diffuse polarised emission over the entire sky. The emission originates mostly from filamentary structures with well-ordered magnetic fields. Some of these structures have been known for decades in radio continuum maps. Their origin is not clear and there are many filaments that are visible for the first time. We have identified and studied 11 filaments. The polarisation fraction of some of them can be as high as 40\%, which is a signature of a well ordered magnetic field. The polarisation spectral indices, averaged over 18 regions in the sky is $β= -3.06 \pm 0.02$, consistent with synchrotron radiation. There are significant variations in $β$ over the sky ($Δβ\approx0.2$). We explore the link between the large-scale filaments and the local ISM, using the model of an expanding shell in the solar vicinity. We compared observed polarisation angles with the predictions from the model and found good agreement. This strongly suggests that many large scale filaments and loops are nearby structures. This is important in the context of the Galactic magnetic field as these structures are normally included in global models, neglecting the fact that they might be local. We also studied the level of contamination added by the diffuse filaments to the CMB polarisation power spectra. We conclude that, even though these filaments present low radio brightness, a careful removal will be necessary for future all-sky CMB polarisation analysis.
description: 21 pages. 17 Figures. Accepted in MNRAS
Examination of the stability of a rod-shaped structure in $^{24}$Mg
Creators: name: Iwata, Yoritaka
name: Ichikawa, Takatoshi
name: Itagaki, Naoyuki
name: Maruhn, Joachim A.
name: Otsuka, Takaharu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The stable existence of a six-$α$ linear structure in highly excited states of $^{24}$Mg is studied based on a systematic Cranked Hartree-Fock calculation with various Skyrme-type interactions. Its stability is examined by allowing the transition of the cluster structure to the shell-model like structure. Especially, the six-$α$ linear state is exposed to two major instabilities: the bending motion, which is the main path for the transition to low-lying states, and the spin-orbit interaction, which is the driving force to break the $α$ clusters and enhance the independent motion of the nucleons. The linear structure with large angular momentum is obtained as a meta-stable stationary state.
description: Phys. Rev. C Rapid Communication, accepted (ver.2); the title is changed to "Examination of the stability of a rod-shaped structure in 24Mg" according to the referee's comment
The impact of a mathematics workshop on mathematics teachers' knowledge and skills
Creators: name: Bos, Samantha Elizabeth
name: 0000-0003-4419-3118
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: subject: Learning disabilities
subject: Mathematics
subject: FOS: Mathematics
subject: Professional development
subject: Teaching

description: Teaching mathematics can be challenging and requires depth and breadth of both content and pedagogical knowledge unique to the subject. Teaching students experiencing mathematical difficulties (MD) requires additional knowledge and skills related to implementing data-driven instructional practices. Professional development has been shown to be an effective method of improving teacher knowledge and skills related to both mathematics and data-driven practices. In a systematic review of the literature on mathematics PD, however, I found variability in the most effective structures and methods for delivering PD. This study examined the effects of a 9-week intensive summer PD regarding the use of data-based individualization within mathematics classrooms on teachers’ mathematical knowledge for teaching, self-efficacy, and instructional practices. A total of 48 initial participants were randomly assigned to complete the summer PD either as part of an Asynchronous group, a Synchronous/Independent group, or a Synchronous/PLC group. Participants completed the National Center on Intensive Intervention (NCII) Mathematics Intervention Course over the course of the 9 weeks, completing approximately 40 hours of materials and activities. ANOVA tests yielded significantly positive results showing participants improved on the Mathematics Teaching Self-Efficacy measure as well as the Teachers Instructional Practices (TIP) measure. Results also showed positive but not significant improvements on Mathematical Knowledge for Teaching (MKT) as well as s Teacher’s Sense of Efficacy Scale. Although not significantly different, participants in the Synchronous groups (i.e., Synchronous/Independent and Synchronous/PLC) saw greater improvements than participants in the Asynchronous group on all measures, and participants in the Synchronous/PLC group saw greater improvements than participants in the Non-PLC groups (i.e., Asynchronous group and Synchronous/Independent group) on all measures. Results of thematic analysis of semi-structured interviews also suggested that participants valued the PD for resources, accountability, and a boost to their confidence, although experiences qualitatively differed across groups. These findings provide initial support for the use of the NCII Mathematics Intervention Course as the foundation for future PD and the inclusion of peer support and accountability structures for online PD. Future research might investigate further the most effective ways of supporting participants in completing the NCII Mathematics Intervention Course during the school year or with observations and coaching support to ensure long-lasting instructional change.
title: A Comparison of SARS-CoV-2 Variants in an hACE2 Mouse Model
Creators: name: Sheesley, Ashley N. Y.
Publisher: name: Utah State University
Year: 2023

description: The Coronavirus Disease-2019 (COVID-19) pandemic, caused by the virus known as Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2), has entered into its fourth year, and has lead to hundreds of millions of people infected, millions of deaths, and millions more facing an uncertain future of long-term health consequences as a result of infection. This devastating pandemic has led to economic instability and massive strains on the public health, healthcare, and mental healthcare systems as we have struggled to keep up with the rapid evolution of the virus. Among the most frustrating elements of this evolution is the emergence of new variants of the virus that can increase transmission, increase disease severity, and/or decrease the efficacy of vaccinations and therapeutics. It is important to remain vigilant in our surveillance of new variants to ensure the treatments and preventions we have in place are still effective. Additionally, these changes may require researchers to change animal models of SARS-CoV-2 to match the current variants. The Institute for Antiviral Research at Utah State University developed mouse models for each of the major variants in a mouse genetically modified to express the human angiotensin converting enzyme 2 (hACE2) receptor that SARS-CoV-2 uses to enter human cells. Expression of the hACE2 receptor makes the mice susceptible to infection with SARS-CoV-2 and allows the comparison of variants within this mouse model. We evaluated the mice for survival, weight loss, clinical and neurological sources, actively replicating virus in different organs, and microscopic analysis of different tissues to observe the damage caused by the variants in the mice. We observed a prolonged time to clinical signs, and a prolonged time to death in the variants after the original pandemic virus, and ultimately saw no deaths in the mice infected with the Omicron subvariant BA.2, along with minimal clinical signs.
Losing the tug of war : a grounded theory study of the development of social media addiction
Creators: name: Sun, Yalin
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Social media addiction
College students

description: In the passing decade, we have witnessed the exponential growth of social media use globally. Along with the increasing popularity of social media are the stories of addictive use, especially among younger generations. Previous studies have found that addictive social media use is associated with negative consequences such as reduced productivity and attention span, task avoidance and procrastination, information overload, and emotional collapse. However, a holistic conceptual understanding of the phenomenon is lacking to support future research investigations and to better inform the design of educational and intervention programs. Therefore, in this study, I explored people’s experiences of social media addiction and the process of how social media addiction develops, with a purpose to generate a substantive theory specific to this phenomenon. I followed the grounded theory approach from Strauss and Corbin (2015) and collected rich qualitative data through interviews, diaries, surveys, and social media activities from 20 college students. The final theoretical framework and its main categories were developed following an iterative process (e.g., constant comparison and theoretical sampling) and evaluated using multiple strategies. The generated theory outlines a dynamic process between two major categories involved in the development of social media addiction: gratification-seeking and self-control. I use the “tug of war” metaphor as the core category to portray this fluctuating and struggling process. I argue that the development of social media addiction involves a constant tussle between gratification-seeking and self-control and that addictive use happens when self-control loses the “tug of war” to reinforced gratification-seeking. Variations and sub-processes were identified and constructed under the categories of gratification-seeking and self-control. In addition to this core process, I also captured four groups of situational triggers (temporal, relational, emotional, and physical) prompting social media use and various contextual factors (in categories of individual differences, socio-cultural influences, and technological influences) contributing to excessive gratification-seeking on social media. The results of this study can support future research with a conceptual framework specific to social media addiction. They also can help identify existing research gaps and potential future research directions, inform the design of educational and intervention programs for social media addiction, and offer guidance for social practices and policymaking.
Ground state properties of ultracold trapped bosons with an immersed ionic impurity
Creators: name: Schurer, J. M.
name: Schmelcher, P.
name: Negretti, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a trapped atomic ensemble of interacting bosons in the presence of a single trapped ion in a quasi one dimensional geometry. Our study is carried out by means of the newly developed multilayer-multiconfiguration time-dependent Hartree method for bosons, a numerical exact approach to simulate quantum many-body dynamics. In particular, we are interested in the scenario by which the ion is so strongly trapped that its motion can be effectively neglected. This enables us to focus on the atomic ensemble only. With the development of a model potential for the atom-ion interaction, we are able to numerically obtain the exact many-body ground state of the atomic ensemble in the presence of an ion. We analyse the influence of the atom number and the atom-atom interaction on the ground state properties. Interestingly, for weakly interacting atoms, we find that the ion impedes the transition from the ideal gas behaviour to the Thomas-Fermi limit. Furthermore, we show that this effect can be exploited to infer the presence of the ion both in the momentum distribution of the atomic cloud and by observing the interference fringes occurring during an expansion of the quantum gas. In the strong interacting regime, the ion modifies the fragmentation process in dependence of the atom number parity which allows a clear identification of the latter in expansion experiments. Hence, we propose in both regimes experimentally viable strategies to assess the impact of the ion on the many-body state of the atomic gas. This study serves as the first building block for systematically investigate many-body physics of such hybrid system.
description: 18 pages, 16 figures, v2: double column, typos corrected, and figures updated
K3 surfaces, modular forms, and non-geometric heterotic compactifications
Creators: name: Malmendier, Andreas
name: Morrison, David R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We construct non-geometric compactifications by using the F-theory dual of the heterotic string compactified on a two-torus, together with a close connection between Siegel modular forms of genus two and the equations of certain K3 surfaces. The modular group mixes together the Kähler, complex structure, and Wilson line moduli of the torus yielding weakly coupled heterotic string compactifications which have no large radius interpretation.
description: 32 pages. v3 has minor changes and additional references
Modeling the impact of interventions to curb the spread of the coronavirus disease 2019 and influenza
Creators: name: Pasco, Rémy
name: 0000-0002-9321-6876
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Simulation
Infectious disease
Mathematical modeling
Coronavirus
COVID-19
Influenza
Public health
Operations research
Optimization
Resource allocation
Intervention
Epidemic
Pandemic

description: The COVID-19 pandemic has brought to the forefront of society the urgent need to better our understanding of infectious diseases, including how they spread and what can be done to control their transmission. In my dissertation I use mathematical models of infectious diseases to analyze the impact and efficacy of various interventions - pharmaceutical and non-pharmaceutical - on the spread of respiratory diseases, focusing on COVID-19 and influenza. The results of my analyses can be used to inform public health measures and guide decision makers in allocating, or prioritizing, scarce resources in order to reduce the burden inflicted by pandemics or seasonal epidemics caused by infectious diseases. First, I use a compartmental model of COVID-19 stratified by age and risk groups in order to analyze the impact of exempting construction workers from stringent social distancing measures enacted early on in the pandemic. In particular, I estimate the increase in disease transmission and hospitalizations in the broader metropolitan area stemming from this exemption, as well as the relative risk incurred by the construction workers themselves. Next, I study the spread of COVID-19 in schools with an agent-based model. Using this detailed model I present a data-driven approach for allocating surveillance tests among schools to reduce both overall infections and disparities among schools that differ in their in-school transmission risk and rate of disease introduction. Using the same model I quantify and compare the impacts on disease burden and in-person learning of the various interventions available to schools, namely proactive testing, vaccination, face coverings, and various quarantine strategies. Finally, I analyze the consequences of widespread use of antivirals for treatment of influenza, weighing their capacity to reduce morbidity and mortality with the risk of treatment-resistance emergence. I carry out this analysis using an individual-based model with a realistic network structure that is calibrated using results from clinical trials of the antiviral baloxavir marboxil in adults and pediatric patients with influenza.
In-situ Piezoresponse Force Microscopy Cantilever Mode Shape Profiling
Creators: name: Proksch, Roger
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The frequency-dependent amplitude and phase in piezoresponse force microscopy (PFM) measurements are shown to be a consequence of the Euler-Bernoulli (EB) dynamics of atomic force microscope (AFM) cantilever beams used to make the measurements. Changes in the cantilever mode shape as a function of changes in the boundary conditions determine the sensitivity of cantilevers to forces between the tip and the sample. Conventional PFM and AFM measurements are made with the motion of the cantilever measured at one optical beam detector (OBD) spot location. A single OBD spot location provides a limited picture of the total cantilever motion and in fact, experimentally observed cantilever amplitude and phase are shown to be strongly dependent on the OBD spot position for many measurements. In this work, the commonly observed frequency dependence of PFM response is explained through experimental measurements and analytic theoretical EB modeling of the PFM response as a function of both frequency and OBD spot location on a periodically poled lithium niobate (PPLN) sample. One notable conclusion is that a common choice of OBD spot location, at or near the tip of the cantilever is particularly vulnerable to frequency dependent amplitude and phase variations stemming from dynamics of the cantilever sensor rather than from the piezoresponse of the sample.
description: 24 pages, 5 figures
Entanglement and swap of quantum states in two qubits
Creators: name: Ikuto, Takaya
name: Ishizaka, Satoshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Suppose that two distant parties Alice and Bob share an entangled state $ρ_{AB}$, and they want to exchange the subsystems of $ρ_{AB}$ by local operations and classical communication (LOCC). In general, this LOCC task (i.e. the LOCC transformation of $ρ_{AB} \to Vρ_{AB} V$ with $V$ being a swap operator) is impossible deterministically, but becomes possible probabilistically. In this paper, we study how the optimal probability is related to the amount of entanglement in the framework of positive partial transposed (PPT) operations, and numerically show a remarkable class of states whose probability is the smallest among every state in two quantum bits.
description: 9 pages, 5 figures, title was changed, accepted version
The jump set under geometric regularisation. Part 1: Basic technique and first-order denoising
Creators: name: Valkonen, Tuomo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 26B30, 49Q20, 65J20

description: Let $u \in \mbox{BV}(Ω)$ solve the total variation denoising problem with $L^2$-squared fidelity and data $f$. Caselles et al. [Multiscale Model. Simul. 6 (2008), 879--894] have shown the containment $\mathcal{H}^{m-1}(J_u \setminus J_f)=0$ of the jump set $J_u$ of $u$ in that of $f$. Their proof unfortunately depends heavily on the co-area formula, as do many results in this area, and as such is not directly extensible to higher-order, curvature-based, and other advanced geometric regularisers, such as total generalised variation (TGV) and Euler's elastica. These have received increased attention in recent times due to their better practical regularisation properties compared to conventional total variation or wavelets. We prove analogous jump set containment properties for a general class of regularisers. We do this with novel Lipschitz transformation techniques, and do not require the co-area formula. In the present Part 1 we demonstrate the general technique on first-order regularisers, while in Part 2 we will extend it to higher-order regularisers. In particular, we concentrate in this part on TV and, as a novelty, Huber-regularised TV. We also demonstrate that the technique would apply to non-convex TV models as well as the Perona-Malik anisotropic diffusion, if these approaches were well-posed to begin with.
MECHANISMS OF FORMATION OF SOCIALLY ACTIVE CIVIC COMPETENCES OF STUDENTS IN THE CONTENT OF ACADEMIC SUBJECTS IN PRIMARY GRADES
Creators: name: Rustambekova, Nigora
Publisher: name: Zenodo
Year: 2023

description: Prospective history teachers face the challenge of navigating stereotypes that have limited the subject to rigid and memorization-based learning methods, presenting it as a closed-off realm of knowledge lacking meaning and interest for many students. Studies examining social science teaching consistently underscore the significant educational value that history holds. Whether through inquiry-based or discovery-focused classroom activities, history engages students in primary cognitive skills like classification, analysis, reflection, and inference.
Multiplicity dependence of jet-like two-particle correlations in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV
Creators: name: ALICE Collaboration
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Two-particle angular correlations between unidentified charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The transverse-momentum range 0.7 $ < p_{\rm{T}, assoc} < p_{\rm{T}, trig}
description: 23 pages, 6 captioned figures, 1 table, authors from page 17, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1618
Whitney Regularity of the Image of the Chevalley mapping
Creators: name: Barbanson, Gerard P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: A closed set $F$ is Whitney 1-regular if for each compact $K\subset F$, the geodesic distance in $K$ is equivalent to the Euclidean distance. Let $P$ be the Chevalley map defined by an integrity basis of the algebra of polynomials invariant by a reflection group, this note gives the Whitney regularity of the image by $P$ of closed balls centered at the origin of ${\mathbb R}^n$. The proof uses the works of Givental', Kostov and Arnold on the symmetric group. It needs a generalization of a property of the Van der Monde determinants to the Jacobian of the Chevalley mappings.
Modeling and Control of High-Voltage Direct-Current Transmission Systems: From Theory to Practice and Back
Creators: name: Zonetti, Daniele
name: Ortega, Romeo
name: Benchaib, Abdelkrim
Publisher: name: arXiv
Year: 2014
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The problem of modeling and control of multi-terminal high-voltage direct-current transmission systems is addressed in this paper, which contains five main contributions. First, to propose a unified, physically motivated, modeling framework - based on port-Hamiltonian representations - of the various network topologies used in this application. Second, to prove that the system can be globally asymptotically stabilized with a decentralized PI control, that exploits its passivity properties. Close connections between the proposed PI and the popular Akagi's PQ instantaneous power method are also established. Third, to reveal the transient performance limitations of the proposed controller that, interestingly, is shown to be intrinsic to PI passivity-based control. Fourth, motivated by the latter, an outer-loop that overcomes the aforementioned limitations is proposed. The performance limitation of the PI, and its drastic improvement using outer-loop controls, are verified via simulations on a three-terminals benchmark example. A final contribution is a novel formulation of the power flow equations for the centralized references calculation.
Concentration in the Red Meat Packing Industry
Creators: name: , Packers
name: , Packers
Publisher: name: Unknown
Year: 1996
Subjects: subject: Agribusiness
subject: Demand and Price Analysis
subject: Farm Management
subject: Industrial Organization
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Research Methods/ Statistical Methods

description: Organization of Report: This report summarizes the work of the contractors. Their objectives, research methods and procedures, data used, and results are presented for each project. Portions of the respective chapters draw liberally from the contractors' reports to GIPSA, with some language from the contractors' reports. Also included at the end of each chapter is a synopsis that includes GIPSA's assessment of the research findings. Chapter 1 -- examines regional cattle procurement markets. Market definitions are relevant for analyses of the effects of concentration on prices paid and for monitoring competitive behavior. GAO also recommended that GIPSA define relevant procurement markets. Chapter 2 -- examines procurement and pricing patterns of beef packers. Chapter 3 -- looks at the role of captive supplies in beef packing. Industry observers and participants frequently express concern about packers' use of captive supplies. This project assesses potential impacts. Chapter 4 -- analyzes the effects of concentration on prices paid for cattle. Concentration is generally thought to increase potential for firms to use market power. Chapter 5 -- addresses vertical coordination in hog production. Vertical coordination is increasing in hog production. Production contracts are growing rapidly in the Southeast and other areas, and marketing contracts are becoming more prevalent in the Midwest. This project looks at trends in vertical arrangements. Chapter 6 -- examines hog procurement in the eastern Corn Belt. The project examined procurement records of packers in the eastern Corn Belt to learn if prices are affected by distance from packing plants, the presence of competing packers, and other factors. Chapter 7 -- reports on the findings of the literature review. Chapter 8 -- summarizes the study. The appendices contain additional details about the data collection and a list of references reviewed in the literature review project.
description: Congress included $500,000 in the Packers and Stockyards Administration (P&SA) 1992 fiscal-year appropriation to conduct a study of concentration in the red meatpacking industry. Although there is a wide range of concentration issues and many are interrelated, the study focused on cattle and hog procurement markets. Six contracts were awarded in September 1992.
On Cohen-Macaulayness of S_n-invariant subspace arrangements
Creators: name: Brookner, Aaron
name: Corwin, David
name: Etingof, Pavel
name: Sam, Steven V
Publisher: name: arXiv
Year: 2014
Subjects: subject: Commutative Algebra (math.AC)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14N20, 13H10

description: Given a partition $λ$ of n, consider the subspace $E_λ$ of $C^n$ where the first $λ_1$ coordinates are equal, the next $λ_2$ coordinates are equal, etc. In this paper, we study subspace arrangements $X_λ$ consisting of the union of translates of $E_λ$ by the symmetric group. In particular, we focus on determining when $X_λ$ is Cohen-Macaulay. This is inspired by previous work of the third author coming from the study of rational Cherednik algebras and which answers the question positively when all parts of $λ$ are equal. We show that $X_λ$ is not Cohen-Macaulay when $λ$ has at least 4 distinct parts, and handle a large number of cases when $λ$ has 2 or 3 distinct parts. Along the way, we also settle a conjecture of Sergeev and Veselov about the Cohen-Macaulayness of algebras generated by deformed Newton sums. Our techniques combine classical techniques from commutative algebra and invariant theory, in many cases we can reduce an infinite family to a finite check which can sometimes be handled by computer algebra.
description: 16 pages, supporting computations included as ancillary files, v2: Conjecture 5.13 changed to Proposition, Proposition 7.5 added
Acerca de las Sesiones de 2019: Números de las Sesiones sobre Buenas Prácticas en el Proceso Editorial de Revistas Científicas para LILACS 2019
Creators: name: BIREME/OPS/OMS
name: Angélica de Souza Alves de Paula, Angélica de Souza Alves de Paula
name: Juliana Gonçalves Reis, Juliana Gonçalves Reis
name: Suga, Sueli Mitiko Yano
Publisher: name: Zenodo
Year: 2020
Subjects: Buenas prácticas
Ciencia aberta
Lilacs
Editores Lilacs
Revista Lilacs
Buenas Prácticas Editoriales

description: Sesiones sobre Buenas Prácticas en el Proceso Editorial de Revistas Científicas para LILACS 2019
Concentration in Agriculture: A Report of the USDA Advisory Committee on Agricultural Concentration
Creators: name: USDA Advisory Committee On Agricultural Concentration
name: USDA Advisory Committee On Agricultural Concentration
Publisher: name: Unknown
Year: 1996
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Industrial Organization
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business

description: Excerpts from the Executive Summary: This report reflects the committee’s collective judgment concerning current agricultural issues that arise from increasing concentration among processing and marketing firms which buy farm products and issues associated with mergers and consolidations in the rail industry. The committee has reviewed existing scientific studies and reports from academic scholars and from government agencies. We have studied the reports of analyses commissioned by the Grain Inspection, Packers and Stockyards Administration (GIPSA) concerning concentration in the livestock and meat industries. We have encouraged and received input and advice from trade associations and other industry experts. We have heard the concerns and advice of farmers and others in a public hearing. We have considered the current interpretation and use of antitrust policy. Our findings and recommendations emphasize concentration and its effect on competitive conditions in livestock and poultry markets from producer to consumer, in railcar allocation, and in areas in which concentration introduces or aggravates other social concerns, such as the vitality of rural communities or their quality of life.
description: Part II of this report summarizes the context in which we reviewed agricultural concentration and its implications for producers, consumers, markets, and rural communities, with particular regard for the cattle and beef sectors. Part III reports findings as they were developed from public testimony, the evidence available and considered by the committee, and our review of the USDA-commissioned study on Concentration in the Red Meat Packing Industry. Part IV presents the committee’s recommendations related to the livestock and poultry sectors. Part V presents the committee’s findings and recommendations with respect to the area of railroad consolidations and railcar shortages. Part VI contains views presented in a minority report.
Inflation driven by q-de Sitter
Creators: name: Setare, M. R.
name: Momeni, D.
name: Kamali, V.
name: Myrzakulov, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Physics (physics.gen-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a generalised de Sitter scale factor for the cosmology of early and late time universe, including single scalar field is called as inflaton. This form of scale factor has a free parameter $q$ is called as nonextensivity parameter. When $q=1$, the scale factor is de Sitter. This scale factor is an intermediate form between power-law and de Sitter. We study cosmology of such families. We show that both kinds of dark components, dark energy and dark matter simultaneously are described by this family of solutions. As a motivated idea, we investigate inflation in the framework of $q$-de Sitter. We consider three types of scenarios for inflation. In a single inflation scenario, we observe that, inflation ended without any specific ending inflation $ϕ_{end}$, the spectral index and the associated running of the spectral index are %$ n_\mathrm{s} - 1 \sim -2ε, \quad α_\mathrm{s} \equiv 0 $. To end the inflation: we should have $q=\frac{3}{4}$. We deduce that the inflation ends when the evolution of the scale factor is $a (t) =e_ {3/4} (t) $. With this scale factor there is no need to specify $ϕ_{end}$. As an alternative to have inflation with ending point, We will study q-inflation model in the context of warm inflation. We propose two forms of damping term $Γ$. In the first case when $Γ=Γ_0$, we show the scale invariant spectrum, (Harrison-Zeldovich spectrum, i.e. $n_s=1$) may be approximately presented by ($q=\frac{9}{10},~~N=70$). Also there is a range of values of $R$ and $n_s$ which is compatible with the BICEP2 data where $q=\frac{9}{10}$. In case $Γ=Γ_1V(ϕ)$, it is observed that small values of a number of e-folds are assured for small values of $q$ parameter. For $q=\frac{9}{10}$ a range of values of $R$ and $n_s$ is compatible with the BICEP2 data.
description: Version has been accepted for publication in "International Journal of Theoretical Physics", Titled changed
Barriers and facilitators to implementing self-directed therapy activities in inpatient rehabilitation settings
Creators: name: Brusco, Natasha
name: Walpole, B
name: Kugler, Helen
name: Tilley, L
name: Thwaites, Claire
name: Devlin, A
name: Dorward, E
name: Dulfer, F
name: Lee, AL
name: Morris, Meg
name: Taylor, Nicholas
name: Dawes, H
name: Whittaker, Sara L
name: Ekegren, CL
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 4201
subject: Allied health and rehabilitation science
classificationCode: 420106
subject: Physiotherapy

description: Background: Self-directed therapy activities are not currently part of routine care during inpatient rehabilitation. Understanding patient and clinician perspectives on self-directed therapy is key to increasing implementation. The aim of this study was to investigate barriers and facilitators to implementing a self-directed therapy programme (“My Therapy”) in adult inpatient rehabilitation settings. Methods: My Therapy was recommended by physiotherapists and occupational therapists and completed by rehabilitation inpatients independently, outside of supervised therapy sessions. Physiotherapists, occupational therapists, and patients were invited to complete an online questionnaire comprising open-ended questions on barriers and facilitators to prescribing and participating in My Therapy. A directed content analysis of free-text responses was undertaken, with data coded using categories of the Capability, Opportunity, and Motivation Model of Behaviour (COM-B model). Results: Eleven patients and 20 clinicians completed the questionnaire. Patient capability was reported to be facilitated by comprehensive education by clinicians, with mixed attitudes towards the format of the programme booklet. Clinician capability was facilitated by staff collaboration. One benefit was the better use of downtime between the supervised therapy sessions, but opportunities for patients to engage in self-directed therapy were compromised by the lack of space to complete the programme. Clinician opportunity was reported to be provided via organisational support but workload was a reported barrier. Patient motivation to engage in self-directed therapy was reported to be fostered by feeling empowered, engaged, and encouraged to participate. Clinician motivation was associated with belief in the value of the programme. Conclusion: Despite some barriers to rehabilitation patients independently practicing therapeutic exercises and activities outside of supervised sessions, both clinicians and patients agreed it should be considered as routine practice. To do this, patient time, ward space, and staff collaboration are required. Further research is needed to scale-up the implementation of the My Therapy programme and evaluate its effectiveness.
Skyrmion fractionalization and merons in chiral magnets with easy-plane anisotropy
Creators: name: Lin, Shi-Zeng
name: Saxena, Avadh
name: Batista, Cristian D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study the equilibrium phase diagram of ultrathin chiral magnets with easy-plane anisotropy $A$. The vast triangular skyrmion lattice phase that is stabilized by an external magnetic field evolves continuously as a function of increasing $A$ into a regime in which nearest-neighbor skyrmions start overlapping with each other. This overlap leads to a continuous reduction of the skyrmion number from its quantized value $Q=1$ and to the emergence of antivortices at the center of the triangles formed by nearest-neighbor skyrmions. The antivortices also carry a small "skyrmion number" $Q_A \ll 1$ that grows as a function of increasing $A$. The system undergoes a first order phase transition into a square vortex-antivortex lattice at a critical value of $A$. Finally, a canted ferromagnetic state becomes stable through another first order transition for a large enough anisotropy $A$. Interestingly enough, this first order transition is accompanied by {\it metastable} meron solutions.
description: 7.1 pages, 7 figures
One-Way Deficit of Two Qubit X States
Creators: name: Wang, Yao-Kun
name: Jing, Naihuan
name: Fei, Shao-Ming
name: Wang, Zhi-Xi
name: Cao, Jun-Peng
name: Fan, Heng
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum deficit originates in questions regarding work extraction from quantum systems coupled to a heat bath [Phys. Rev. Lett. 89, 180402 (2002)]. It links quantum correlations with quantum thermodynamics and provides a new standpoint for understanding quantum non-locality. In this paper, we propose a new method to evaluate the one-way deficit for a class of two-qubit states. The dynamic behavior of the one-way deficit under decoherence channel is investigated and it is shown that the one-way deficit of the X states with five parameters is more robust against the decoherence than the entanglement.
description: 8 pages, 1 figures
Automatic Delineation of Water Bodies in SAR Images with a Novel Stochastic Distance Approach
Creators: name: Rey, Andrea
name: Sarmiento, Natalia Revollo Revollo
name: Frery, Alejandro
name: Delrieux, Claudio
Publisher: name: Open Access Te Herenga Waka-Victoria University of Wellington
Year: 2022
Subjects: subject: 90999 Geomatic Engineering not elsewhere classified
subject: FOS: Environmental engineering
subject: 20399 Classical Physics not elsewhere classified
subject: FOS: Physical sciences
subject: 40699 Physical Geography and Environmental Geoscience not elsewhere classified
subject: FOS: Earth and related environmental sciences

description: Coastal regions and surface waters are among the fundamental biological and social development resources worldwide. For this reason, it is essential to thoroughly monitor these regions to determine and characterize their geographical features and environmental health. These geographical regions, however, present several monitoring challenges when using remotely sensed imagery. Small water bodies tend to be surrounded by swamps, marshes, or vegetation, making accurate border detection difficult. Coastal waters, in turn, experience several phenomena due to winds, undercurrents, and waves, which also hamper the detection of environmental hazards like oil spills. In this work, we propose an automated segmentation algorithm that can be applied to these targets in airborne and spaceborne SAR images. The method is based on pointwise detection in fuzzy borders using a parameter estimation of the G0 distribution, which has been successfully used in similar contexts. The underlying assumption is that the sought-for border separates regions with different textures, each having different distribution parameters. Then, stochastic distances can identify the most likely point where this parameter change occurs. A curve interpolation algorithm then estimates the actual contour of the body given the detected points. We assess the adequacy of eight stochastic distances that are mostly applied in the literature. We evaluate the performance of our method in terms of similarity between true and detected boundaries on simulated and actual SAR images, achieving promising results. The performance of our proposal is assessed by Hausdorff distance and Intersection over Union. In the case of synthetic data, the selection of the best stochastic distance depends on the parameters of the GI0 distribution. In contrast, the harmonic-mean and triangular distances produced the best results in detecting borders in three actual SAR images of lagoons. Finally, we present the results of our proposal applied to an image with oil spills using Bhattacharyya, Hellinger, and Jensen–Shannon distances.
Wave fronts via Fourier series coefficients
Creators: name: Maksimovic, Snjezana
name: Pilipovic, Stevan
name: Sokoloski, Petar
name: Vindas, Jasson
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 35A18 (Primary), 46F10 (Secondary)

description: Motivated by the product of periodic distributions, we give a new description of the wave front and the Sobolev-type wave front of a distribution $f\in\mathscr{D}'(\mathbb{R}^d)$ in terms of Fourier series coefficients.
description: 10 pages