cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Nursing students’ perceptions of effective clinical teacher behaviours
Creators: name: Chow, Lisa Kim
Publisher: name: University of British Columbia
Year: 2009

description: This study sought to identify nursing students’ perceptions of effective clinical teacher behaviours, and to determine whether novice and advanced beginner students perceive different teacher behaviours as effective. The theoretical framework for the study drew on the concepts of clinical teacher behaviours (Reilly & Oermann, 1992), students’ perceptions (Woodruff, 1967), and the competency levels of the students (Benner, 1984). The study took place in selected colleges and university colleges within British Columbia, collaborating to develop and implement a ‘caring curriculum’ (Bevis & Watson, 1989). The study sample included 83 students enrolled in their third term, who were considered novices, and 55 students enrolled in their sixth term, who were considered advanced beginners. Data were collected through the use of two instruments: the Priority Clinical Teacher Behaviour Questionnaire; and the Nursing Clinical Teacher Effectiveness Inventory. Results of the study indicated that all students emphasized the need for clinical teachers to be knowledgeable, demonstrate clinical skill and judgment, be approachable, provide support, and be open minded and non-judgmental. Novice and advanced beginner students shared many of the same perceptions regarding effective clinical teacher behaviours, although certain differences were evident. Novice students placed more emphasis than advanced beginner students did on teacher behaviours of being caring, giving positive feedback, and demonstrating clinical skill and judgment. Advanced beginner students, on the other hand, placed more emphasis on teacher behaviours of taking responsibility for their actions, and being honest, enthusiastic, and nonjudgmental. Analysis also revealed a subset of behaviours emphasized by advanced beginner students. Statistically significant (p < .05) differences were found between advanced beginner and novice ratings of certain categories of teacher behaviours, such as personal characteristics, interpersonal skills, and evaluation. Students’ perceptions were also found to vary somewhat across sites. While some of these findings supported research previously conducted in the area, other findings offered a new perspective on students’ perceptions of effective clinical teacher behaviours.
Non-Hermitian skin effect of dislocations and its topological origin
Creators: name: Bhargava, Balaganchi A.
name: Fulga, Ion Cosma
name: Brink, Jeroen van den
name: Moghaddam, Ali G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We demonstrate that dislocations in two-dimensional non-Hermitian systems can give rise to density accumulation or depletion through the localization of an extensive number of states. These effects are shown by numerical simulations in a prototype lattice model and expose a different face of non-Hermitian skin effect, by disentangling it from the need for boundaries. We identify a topological invariant responsible for the dislocation skin effect, which takes the form of a ${\mathbb Z}_2$ Hopf index that depends on the Burgers vector characterizing the dislocations. Remarkably, we find that this effect and its corresponding signature for defects in Hermitian systems falls outside of the known topological classification based on bulk-defect correspondence.
description: 6+4 pages, 2+2 figures
Writhing Dynamics of Cables with Self-contact
Creators: name: Goyal, Sachin
name: Perkins, Noel C.
name: Lee, Christopher L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Marine cables under low tension and torsion on the sea floor can form highly contorted three-dimensional geometries that include loops (e.g. hockles) and tangles. These geometries arise from the conversion of torsional strain energy to bending strain energy or, kinematically, a conversion of twist to writhe. A dynamic form of Kirchhoff rod theory is reviewed herein that captures these nonlinear dynamic processes. The resulting theory is discretized using the generalized-alpha method for finite differencing in both space and time. Numerical solutions are presented for an example system of a cable subjected to increasing twist at one end. The solutions show the dynamic evolution of the cable from an initially straight element, through a buckled element in the approximate form of a helix, through the dynamic collapse of this helix into a loop, and subsequent intertwining of the loop with multiple sites of self-contact.
description: 10 pages, 8 figures, 2 tables, in Proceedings of Fifth International Symposium on Cable Dynamics, Santa Margherita Ligure, Italy, pp. 27-36, Sept 15-18, 2003
RANDOM CANDIDATE ELECTIONS
Creators: name: Rath, Josiah
Publisher: name: Zenodo
Year: 2021
Subjects: elections
randomization
political economy

description: I develop an electoral mechanism called “Random Candidate Elections” (RCEs) under both discrete and continuous settings. Candidates (or policies) are randomly selected from a population and voted upon according to a simple spatial model. I find that the win-maximizing positions are dependent on the number of candidates involved, as well as the electoral regime utilized. Results from simulation back these findings.
A supra-massive population of stellar-mass black holes in the globular cluster Palomar 5
Creators: name: Gieles, Mark
name: Erkal, Denis
name: Antonini, Fabio
name: Balbinot, Eduardo
name: Peñarrubia, Jorge
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Palomar 5 is one of the sparsest star clusters in the Galactic halo and is best-known for its spectacular tidal tails, spanning over 20 degrees across the sky. With N-body simulations we show that both distinguishing features can result from a stellar-mass black hole population, comprising ~20% of the present-day cluster mass. In this scenario, Palomar 5 formed with a `normal' black hole mass fraction of a few per cent, but stars were lost at a higher rate than black holes, such that the black hole fraction gradually increased. This inflated the cluster, enhancing tidal stripping and tail formation. A gigayear from now, the cluster will dissolve as a 100% black hole cluster. Initially denser clusters end up with lower black hole fractions, smaller sizes, and no observable tails. Black hole-dominated, extended star clusters are therefore the likely progenitors of the recently discovered thin stellar streams in the Galactic halo.
description: 33 pages, 7 figures, 3 tables, accepted for Nature Astronomy (update to match final published version to appear on 5 July 2021)
Per un nuovo itinerario gergale nella letteratura del secondo '900: «Lo sbarbato» di Umberto Simonetta («L'angolo dell'italiano, 1)»
Creators: name: Bellone, Luca
Publisher: name: Carte romanze
Year: 2019
Subjects: Umberto Simonetta, Lo sbarbato; gergo; slang; lessicografia; lexicography; lessicologia; linguaggio giovanile; Italian Teen Slang

description: Il contributo si propone di analizzare l’originale veste linguistica che caratterizza il romanzo d’esordio di Umberto Simonetta, Lo sbarbato (1963), con particolare attenzione alla componente gergale alla base del dialogato dei giovani protagonisti dell’opera. The paper aims to analyse the original linguistic aspect that characterizes Umberto Simonetta’s debut novel, Lo sbarbato (1963), with particular attention to the jargon component at the base of the dialogue between the young protagonists of the work.
description: Carte romanze, V. 7, N. 1 (2019)
Non-Gaussian corrections to the probability distribution of the curvature perturbation from inflation
Creators: name: Seery, David
name: Hidalgo, J. Carlos
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show how to obtain the probability density function for the amplitude of the curvature perturbation, R, produced during an epoch of slow-roll, single-field inflation, working directly from n-point correlation functions of R. These n-point functions are the usual output of quantum field theory calculations, and as a result we bypass approximate statistical arguments based on the central limit theorem. Our method can be extended to deal with arbitrary forms of non-Gaussianity, appearing at any order in the n-point hierarchy. We compute the probability density for the total smoothed perturbation within a Hubble volume, ε, and for the spectrum of ε. When only the two-point function is retained, exact Gaussian statistics are recovered. When the three-point function is taken into account, we compute explicitly the leading slow-roll correction to the Gaussian result.
description: 30 pages; uses iopart.cls LaTeX style. v2: Replaced with version accepted by JCAP
Wallpaper group kirigami
Creators: name: Liu, Lucy
name: Choi, Gary P. T.
name: Mahadevan, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Geometry (cs.CG)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Kirigami, the art of paper cutting, has become a paradigm for mechanical metamaterials in recent years. The basic building blocks of any kirigami structures are repetitive deployable patterns that derive inspiration from geometric art forms and simple planar tilings. Here we complement these approaches by directly linking kirigami patterns to the symmetry associated with the set of seventeen repeating patterns that fully characterize the space of periodic tilings of the plane. We start by showing how to construct deployable kirigami patterns using any of the wallpaper groups, and then design symmetry-preserving cut patterns to achieve arbitrary size changes via deployment. We further prove that different symmetry changes can be achieved by controlling the shape and connectivity of the tiles and connect these results to the underlying kirigami-based lattice structures. All together, our work provides a systematic approach for creating a broad range of kirigami-based deployable structures with any prescribed size and symmetry properties.
Statistical strong lensing. I. Constraints on the inner structure of galaxies from samples of a thousand lenses
Creators: name: Sonnenfeld, Alessandro
name: Cautun, Marius
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context: The number of known strong gravitational lenses is expected to grow substantially in the next few years. The statistical combination of large samples of lenses has the potential of providing strong constraints on the inner structure of galaxies. Aims: We investigate to what extent we can calibrate stellar mass measurements and constrain the average dark matter density profile of galaxies by statistically combining strong lensing data from thousands of lenses. Methods: We generate mock samples of axisymmetric lenses. We assume that, for each lens, we have measurements of two image positions of a strongly lensed background source, as well as magnification information from full surface brightness modelling, and a stellar population synthesis-based estimate of the lens stellar mass. We then fit models describing the distribution of the stellar population synthesis mismatch parameter $α_{sps}$ (the ratio between the true stellar mass and the stellar population synthesis-based estimate) and dark matter density profile of the population of lenses to an ensemble of 1000 mock lenses. Results: The average $α_{sps}$, projected dark matter mass and dark matter density slope can be obtained with great precision and accuracy, compared with current constraints. A flexible model and the knowledge of the lens detection efficiency as a function of image configuration are required in order to avoid a biased inference. Conclusions: Statistical strong lensing inferences from upcoming surveys have the potential to calibrate stellar mass measurements and to constrain the inner dark matter density profile of massive galaxies.
description: Published on Astronomy & Astrophysics. A 2-minute summary video can be found at this link: https://youtu.be/En0-uJobqE4
Dynamical Systems, Stability, and Chaos
Creators: name: Ball, R.
name: Holmes, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: In this expository and resources chapter we review selected aspects of the mathematics of dynamical systems, stability, and chaos, within a historical framework that draws together two threads of its early development: celestial mechanics and control theory, and focussing on qualitative theory. From this perspective we show how concepts of stability enable us to classify dynamical equations and their solutions and connect the key issues of nonlinearity, bifurcation, control, and uncertainty that are common to time-dependent problems in natural and engineered systems. We discuss stability and bifurcations in three simple model problems, and conclude with a survey of recent extensions of stability theory to complex networks.
description: 28 pages, 10 figures. 26/04/2007: The book title was changed at the last minute. No other changes have been made. Chapter 1 in: J.P. Denier and J.S. Frederiksen (editors), Frontiers in Turbulence and Coherent Structures. World Scientific Singapore 2007 (in press)
WKB formalism and a lower limit for the energy eigenstates of bound states for some potentials
Creators: name: Barragan-Gil, Luis F.
name: Camacho, Abel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the present work the conditions appearing in the WKB approximation formalism of quantum mechanics are analyzed. It is shown that, in general, a careful definition of an approximation method requires the introduction of two length parameters, one of them always considered in the text books on quantum mechanics, whereas the second one is usually neglected. Afterwards we define a particular family of potentials and prove, resorting to the aforementioned length parameters, that we may find an energy which is a lower bound to the ground energy of the system. The idea is applied to the case of a harmonic oscillator and also to a particle freely falling in a homogeneous gravitational field, and in both cases the consistency of our method is corroborated. This approach, together with the Rayleigh--Ritz formalism, allows us to define an energy interval in which the ground energy of any potential, belonging to our family, must lie.
description: Accepted in Modern Physics Letters A
International project to map the potential for horizontal transfer of antibiotic resistance genes across different ecosystems
Creators: name: Kořínková, Marta
name: Štěpánková, Martina
name: Drahošová, Zdislava
name: Matoušková, Nelly
name: Matějů, Ladislava
name: Hochmalová, Karolína
name: Zimová, Magdalena
Publisher: name: Zenodo
Year: 2021
Subjects: FED-AMR

description: Project presentation by SZU during an "Ekomonitor" seminar on Waste Analytics.
Spin-3/2 baryons from an anisotropic lattice QCD action
Creators: name: Zhou, Leming
name: Lee, Frank X.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The mass spectrum of baryons in the spin-3/2 sector is computed in quenched lattice QCD using a tadpole-improved anisotropic action. Both isospin 1/2 and 3/2 (the traditional decuplet) are considered, as well as members that contain strange quarks. States with positive and negative parities are isolated by parity projection, while states with spin-3/2 and spin-1/2 are separated by spin projection. The extent to which spin projection is needed is examined. The issue of optimal interpolating field is also investigated. The results are discussed in relation to previous calculations and experiment.
description: modified version to appear in Phys Rev D
Improved upper bounds on the stabilizer rank of magic states
Creators: name: Qassim, Hammam
name: Pashayan, Hakop
name: Gosset, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work we improve the runtime of recent classical algorithms for strong simulation of quantum circuits composed of Clifford and T gates. The improvement is obtained by establishing a new upper bound on the stabilizer rank of $m$ copies of the magic state $|T\rangle=\sqrt{2}^{-1}(|0\rangle+e^{iπ/4}|1\rangle)$ in the limit of large $m$. In particular, we show that $|T\rangle^{\otimes m}$ can be exactly expressed as a superposition of at most $O(2^{αm})$ stabilizer states, where $α\leq 0.3963$, improving on the best previously known bound $α\leq 0.463$. This furnishes, via known techniques, a classical algorithm which approximates output probabilities of an $n$-qubit Clifford + T circuit $U$ with $m$ uses of the T gate to within a given inverse polynomial relative error using a runtime $\mathrm{poly}(n,m)2^{αm}$. We also provide improved upper bounds on the stabilizer rank of symmetric product states $|ψ\rangle^{\otimes m}$ more generally; as a consequence we obtain a strong simulation algorithm for circuits consisting of Clifford gates and $m$ instances of any (fixed) single-qubit $Z$-rotation gate with runtime $\text{poly}(n,m) 2^{m/2}$. We suggest a method to further improve the upper bounds by constructing linear codes with certain properties.
description: A preliminary version of our results was reported in the first author's Ph.D thesis
The Progression of Crouch Gait in Bilateral Cerebral Palsy
Creators: name: O'Sullivan, Rory
Publisher: name: Royal College of Surgeons in Ireland
Year: 2021
Subjects: subject: 110904 Neurology and Neuromuscular Diseases
subject: FOS: Clinical medicine

description: Cerebral palsy (CP) is due to an insult to the developing brain and is the most common cause of motor deficiency in young children and usually leads to muscle spasticity, weakness and joint contracture which have a significant effect on gait. Crouch gait, defined as excessive knee flexion in stance phase, is a prevalent pathological gait patterns associated with CP and is thought to increase the energy cosy of gait and contribute to increased forces on the knee joint. Crouch is therefore often the focus of surgical intervention in CP. This thesis aimed to inform the natural progression of crouch gait in CP in the absence of surgical intervention.A systematic review of the existing literature highlighted the lack of prospective studies on crouch gait and found that four of the five retrospective studies included in the final analysis reported increased crouch over time while only a single participant case-study demonstrated an overall improvement in knee extension over time and highlighted variation in crouch gait over a number of assessments.The current study prospectively assessed knee flexion at mid-stance every six months (to a maximum of six assessments) in the absence of surgical intervention in a cohort of child/adolescent participants with bilateral CP (n=50). Clinical examination, assessment of quality of life (QoL) and daily activity were also completed at each assessment. One-year post-operative outcomes in child/adolescent participants who had surgical intervention (n=16) and the progression of crouch gait in adult participants (n=5) were described separately.The results highlighted significant intra-participant variability in this measure of crouch gait over repeated analyses and this variability was associated with younger age. The mean value of knee flexion at mid-stance did not increase between the first and last analyses 3.34±0.52 years apart despite a significant increase in hamstring tightness. Overall, there did not appear to be an association between crouch gait and QoL or daily activity measures when examined over repeated assessments.These results suggest that caution is advised in planning intervention based on an increase in knee flexion in stance phase over two analyses only, particularly in younger children, as this may reflect natural variability in this measure. Furthermore, the results highlight that increased hamstring tightness is not associated with increased knee crouch. This suggests that interventions other than hamstring lengthening should be considered to address crouch gait in bilateral CP.
The Sherrington-Kirkpatrick model for spin glasses: A new approach for the solution
Creators: name: Rodríguez-Camargo, C. D.
name: Mojica-Nava, E. A.
name: Svaiter, N. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss the Sherrington-Kirkpatrick mean-field version of a spin glass within the distributional zeta-function method (DZFM). In the DZFM, since the dominant contribution to the average free energy is written as a series of moments of the partition function of the model, the spin-glass multivalley structure is obtained. Also, an exact expression for the saddle points corresponding to each valley and a global critical temperature showing the existence of many stables or at least metastables equilibrium states is presented. Near the critical point we obtain analytical expressions of the order parameters that are in agreement with phenomenological results. We evaluate the linear and nonlinear susceptibility and we find the expected singular behavior at the spin-glass critical temperature. Furthermore, we obtain a positive definite expression for the entropy and we show that ground-state entropy tends to zero as the temperature goes to zero. We show that our solution is stable for each term in the expansion. Finally, we analyze the behavior of the overlap distribution, where we find a general expression for each moment of the partition function.
description: 14 pages, 8 figures
Imaging and controlling electron transport inside a quantum ring
Creators: name: Hackens, B.
name: Martins, F.
name: Ouisse, T.
name: Sellier, H.
name: Bollaert, S.
name: Wallart, X.
name: Cappy, A.
name: Chevrier, J.
name: Bayot, V.
name: Huant, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Traditionally, the understanding of quantum transport, coherent and ballistic1, relies on the measurement of macroscopic properties such as the conductance. While powerful when coupled to statistical theories, this approach cannot provide a detailed image of "how electrons behave down there". Ideally, understanding transport at the nanoscale would require tracking each electron inside the nano-device. Significant progress towards this goal was obtained by combining Scanning Probe Microscopy (SPM) with transport measurements2-7. Some studies even showed signatures of quantum transport in the surrounding of nanostructures4-6. Here, SPM is used to probe electron propagation inside an open quantum ring exhibiting the archetype of electron wave interference phenomena: the Aharonov-Bohm effect8. Conductance maps recorded while scanning the biased tip of a cryogenic atomic force microscope above the quantum ring show that the propagation of electrons, both coherent and ballistic, can be investigated in situ, and even be controlled by tuning the tip potential.
description: 11 text pages + 3 figures
Commonsense knowledge support in database design expert systems
Creators: name: Ding, Jie
Publisher: name: University of British Columbia
Year: 2009

description: Conceptual database design is the most critical and difficult phase in designing a database centered application. It usually requires database design experts which are hard to find and expensive. There has been some effort in building expert systems, including the View Creation System (VCS), to support this design process. However, all of these systems lack commonsense knowledge human experts have and therefore can not provide effective support to the user. A prototype commonsense knowledge base, the Commonsense Business Reasoner (CBR), has been built for the VCS. But it is not filly implemented and not connected to the VCS. The usefulness of commonsense knowledge in a database design expert system has not been studied. In this paper, a new domain of relevance ontology was proposed to store domain of relevance for commonsense knowledge. Combined with the Naive Semantics ontology used in the CBR, a new commonsense knowledge base structure was built and implemented. This was integrated into the original VCS and can provide interactive commonsense knowledge support during the design process. Other improvements were also done to the VCS to make it more user friendly. A fill scale empirical study was conducted to test the effectiveness of the commonsense module. The results indicated subjects perceived the system with commonsense knowledge easier to use and finished the task in less time. However, there is no statistically significant difference in the design quality. Explanations to these results are discussed as well as future research directions.
Test for normality(Shapiro Wilk test) and Kurtosis of signed FA in five bird species;Test for the significance of signed FA and directional asymmetry;Estimates of mean rectrix length for five bird species from Fluctuating asymmetry and feather growth bars as biomarkers to assess the habitat quality of shade coffee farming for avian diversity conservation
Creators: name: Gelaye Gebremichael
name: Diress Tsegaye
name: Bunnefeld, Nils
name: Zinner, Dietmar
name: Anagaw Atickem
Publisher: name: Figshare
Year: 2019
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Table S1. Tarsus length and rectrix mass signed FA analysis in five bird species. Species: Abyssinian Ground Thrush (AGT), African dusky Flycatcher (ADF), Grey-backed Camaroptera (GBC), Rüppell's Robin-chat (RRC) and Tambourine Dove (TD). Natural=Natural forest and TFL=mean of the second outer most right and left rectrices.;Table S2. Estimates of bilateral traits asymmetry for tarsus length and rectrix mass. Level of fluctuating asymmetry (FA) and directional asymmetry (DA) relative to measurement error (ME) were obtained from mixed regression model analysis and as a basis to calculate repeatability intra-correlation coefficient(ICC) = FA/(FA+ME). Measured trait (tarsus length or rectrix mass) values included in the models a response variable, side both as fixed and random effects and individual Id as a subject.;Table S3. Estimates of mean rectrix length from general linear mixed models, where mean rectrices lengths (mean of the second outer most right and left) as response variable, forest type as fixed effect, and sampling location as random effect. Species: Abyssinian Ground Thrush (AGT), African dusky Flycatcher (ADF), Grey-backed Camaroptera (GBC), Rüppell's Robin-chat (RRC) and Tambourine Dove (TD). Natural=Natural forest.
Quantum metrology with precision reaching beyond-$1/N$ scaling through $N$-probe entanglement generating interactions
Creators: name: Deng, Xing
name: Chen, Shou-Long
name: Zhang, Mao
name: Xu, Xiao-Fan
name: Liu, Jing
name: Gao, Zhi
name: Duan, Xiao-Chun
name: Zhou, Min-Kang
name: Cao, Lushuai
name: Hu, Zhong-Kun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nonlinear interactions are recognized as potential resources for quantum metrology, facilitating parameter estimation precisions that scale as the exponential Heisenberg limit of $2^{-N}$. We explore such nonlinearity and propose an associated quantum measurement scenario based on the nonlinear interaction of $N$-probe entanglement generating form. This scenario provides an enhanced precision scaling of $D^{-N}/(N-1)!$ with $D > 2$ a tunable parameter. In addition, it can be readily implemented in a variety of experimental platforms and applied to measurements of a wide range of quantities, including local gravitational acceleration $g$, magnetic field, and its higher-order gradients.
Loop Quantum Cosmology of Diagonal Bianchi Type I model: simplifications and scaling problems
Creators: name: Szulc, Lukasz
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A simplified theory of the diagonal Bianchi type I model coupled with a massless scalar field in loop quantum cosmology is constructed according to the $\barμ$ scheme. Kinematical and physical sectors of the theory are under good analytical control as well as the scalar constraint operator. Although it is possible to compute numerically the nonsingular evolution of the three gravitational degrees of freedom, the naive implementation of the $\barμ$ scheme to the diagonal Bianchi type I model is problematic. The lack of the full invariance of the theory with respect to the fiducial cell and fiducial metric scaling causes serious problems in the semiclassical limit of the theory. Because of this behavior it is very difficult to extract reasonable physics from the model. The weaknesses of the implementation of the $\barμ$ scheme to the Bianchi I model do not imply limitations of the $\barμ$ scheme in the isotropic case.
description: 11 pages, 12 figures, version to appear in PRD
Additional file 1 of Visible light-regulated cationic polymer coupled with photodynamic inactivation as an effective tool for pathogen and biofilm elimination
Creators: name: Wang, Qian
name: Shi, Qingshan
name: Li, Yulian
name: Lu, Shunying
name: Xie, Xiaobao
Publisher: name: figshare
Year: 2022
Subjects: subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional File 1: Figure S1. Synthesis scheme of the TPP (a) and TPP-PEI polymer (b). Figure S2. Gel permeation chromatography of amphiphilic polymer TPP-PEI. Figure S3. UV/Vis spectra of Ce6-TPP-PEI with different amounts of Ce6 (a). Standard curve of free Ce6 by measuring absorbance at 405 nm with series of concentrations with UV/Vis spectra (b). Figure. S4. Dose-dependent growth inhibition of TPP-PEI against B. subtilis (a) and E. coli (b), Ce6-TPP-PEI against B. subtilis (c) and E. coli (d). Data are presented as mean ± SD (n=4). Table S1. Minimum inhibitory concentration (MIC) of Ce6-TPP-PEI, TPP-PEI, and free Ce6 against B. subtilis, E.coli and C. albicans (μg/mL). Figure S5. Composite 3-D micrographs of biofilms after treatment with Ce6-TPP-PEI (A), TPP-PEI (B), free Ce6 (C) and PBS (D) upon with visible light irradiation (5 min at 30 mW/cm2) or not. The biofilms were double-stained with SYTO 9 and PI.
Universality of excited three-body bound states in one dimension
Creators: name: Happ, Lucas
name: Zimmermann, Matthias
name: Efremov, Maxim A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a heavy-heavy-light three-body system confined to one space dimension provided the binding energy of an excited state in the heavy-light subsystems approaches zero. The associated two-body system is characterized by (i) the structure of the weakly-bound excited heavy-light state and (ii) the presence of deeply-bound heavy-light states. The consequences of these aspects for the behavior of the three-body system are analyzed. We find strong indication for universal behavior of both three-body binding energies and wave functions for different weakly-bound excited states in the heavy-light subsystems.
Statefinder Revisited
Creators: name: Ishida, Emille E. O.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The quality of supernova data will dramatically increase in the next few years by new experiments that will add high-redshift supernova to the currently known ones. In order to use this new data to discriminate between different dark energy models, the statefinder diagnostic was suggested and investigated by Alam et al. in the light of the proposed SuperNova Acceleration Probe (SNAP) satellite. By making use of the same procedure presented by these authors, we compare their analyzes with ours, which shows a more realistic supernovae redshift distribution and do not assume that the intercept is known. We also analyzed the behavior of the statefinder pair {r,s} and the alternative pair {s,q} in the presence of offset errors.
Fabrication, Mechanical Characterization and Selection of Hybrid Composites by TOPSIS
Creators: name: MOHAMMED, RAFFI
Publisher: name: Figshare
Year: 2019
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering

description: Abstract: Fiber reinforced polymer composites are utilized in an assortment of use in light of their numerous favorable circumstances, for example, moderately ease of creation, simple to manufacture and better quality analyze than flawless polymer resins. Fortification in a polymer is neither manufactured nor normal. A manufactured fiber, for example, carbon, glass and so forth has high explicit quality however their fields of use are constrained because of the greater expense of generation. As of late, there is an expanded enthusiasm for regular filler based composites because of their numerous points of interest. In this association, an examination has been done to improve the usage of Bagasse cinder /coal fly fiery debris/coal powder as filler material alongside glass fiber as fortification for the readiness of epoxy based mixture composites . The target of the present investigation is to examine the mechanical properties of composite reinforced with epoxy glass based on hybrid epoxy. The impact of filler material and fiber impact stacking on mechanical properties like elasticity, ILSS, tensile modulus, flexural quality, hardness and impact strength of composites is examined. Multi-Criteria basic leadership access named TOPSIS is likewise used to choose the good option from a lot of choices dependent on various characteristics (mechanical attributes).
Teaching students in heterogeneous and homogeneous Algebra II classes: teacher’s perspectives and student performance
Creators: name: Paul, Sarita
Publisher: name: No Publisher Supplied
Year: 2021

description: The controversial debate between detracking and tracking classes has been a topic of discussion from many years. Although many researchers believe the homogenized classroom makeup to be best, researchers not in favor of tracking claim the impact of academic segregation is a serious demonstration of inequality in education (Boaler, 2006; Batruch et al., 2019; Domina et al., 2019; Hallinan, 1994; Lotan et al., 1992; Rubin, 2006). Although educational equality is a vital component of detracking/tracking, the focus here is on academic outcomes.The goal of the current study was to understand the experience secondary mathematic teachers underwent when a class was changed from tracked to detracked. In addition, this study’s aim was to understand the effective supports needed by teachers to successfully teach heterogeneous classes that were once homogeneous. Furthermore, I compared the experiences teachers had when teaching heterogeneous and homogeneous classes. To accomplish this, I conducted semi-structured interviews and qualitatively analyzed the transition from tracking to detracking math classes, changes in teacher experience between teaching heterogeneous and homogeneous classes, and if supports received or not received affected teachers’ ability to teach heterogeneous classes. Additionally, I completed a linear regression to see if class organization (i.e., tracked, detracked) and/or geometry ability (i.e., above average, average, below average) could predict student performance in Algebra II classes.Results indicated that Algebra II teachers felt their voices were not heard and were given no chance to share their input when decisions were made by administration. The teachers recognized the significant differences and felt more at ease when teaching homogeneous classes than heterogeneous classes. Results also indicated that the teachers understood the need for collaboration and support as they transitioned to teach heterogeneous classrooms. Finally, the analysis of student performance within these heterogeneous and homogeneous classrooms provided evidence that with below average students, there was a practical significance for this group with a near 9.3-point final grade advantage for the tracked class organization.
Task Transformer Network for Joint MRI Reconstruction and Super-Resolution
Creators: name: Feng, Chun-Mei
name: Yan, Yunlu
name: Fu, Huazhu
name: Chen, Li
name: Xu, Yong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The core problem of Magnetic Resonance Imaging (MRI) is the trade off between acceleration and image quality. Image reconstruction and super-resolution are two crucial techniques in Magnetic Resonance Imaging (MRI). Current methods are designed to perform these tasks separately, ignoring the correlations between them. In this work, we propose an end-to-end task transformer network (T$^2$Net) for joint MRI reconstruction and super-resolution, which allows representations and feature transmission to be shared between multiple task to achieve higher-quality, super-resolved and motion-artifacts-free images from highly undersampled and degenerated MRI data. Our framework combines both reconstruction and super-resolution, divided into two sub-branches, whose features are expressed as queries and keys. Specifically, we encourage joint feature learning between the two tasks, thereby transferring accurate task information. We first use two separate CNN branches to extract task-specific features. Then, a task transformer module is designed to embed and synthesize the relevance between the two tasks. Experimental results show that our multi-task model significantly outperforms advanced sequential methods, both quantitatively and qualitatively.
Variational method in relativistic quantum field theory without cutoff
Creators: name: Tilloy, Antoine
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The variational method is a powerful approach to solve many-body quantum problems non perturbatively. However, in the context of relativistic quantum field theory (QFT), it needs to meet 3 seemingly incompatible requirements outlined by Feynman: extensivity, computability, and lack of UV sensitivity. In practice, variational methods break one of the 3, which translates into the need to have an IR or UV cutoff. In this letter, I introduce a relativistic modification of continuous matrix product states that satisfies the 3 requirements jointly in 1+1 dimensions. I apply it to the self-interacting scalar field, without UV cutoff and directly in the thermodynamic limit. Numerical evidence suggests the error decreases faster than any power law in the number of parameters, while the cost remains only polynomial.
description: v2 - major update on the algorithm v1 - 4 pages - see same posting for a longer companion paper "Relativistic continuous matrix product states for quantum fields without cutoff" containing more derivations, context, and explanations
title: Markt- und Anwendungsstudie zum Digitalisierungsgrad der personellen Ressourcenplanung in der Intralogistik
Creators: name: Wings, Linda Maria
name: von Preetzmann, Tobias
name: Kretschmer, Veronika
Publisher: name: Wissenschaftliche Gesellschaft für Technische Logistik
Year: 2021
Subjects: subject: Personelle Ressourcenplanung
subject: Digitalisierung
subject: Intralogistik
subject: Anwendungsstudie
subject: Human Resource Planning
subject: Digitization
subject: Intralogistics
subject: User Study
subject: 620

description: Volume 2021, Issue 17
description: Trotz steigender Anforderungen und der breiten Verfügbarkeit unterschiedlichster Softwaresysteme fehlt ein Überblick zum Digitalisierungsgrad der personellen Ressourcenplanung in der Intralogistik. Um diesen zu ermitteln, wurden zwei Fragebögen erarbeitet, anhand derer eine Datenerhebung aus den Perspektiven von softwareanbietenden und lagerbetreibenden Unternehmen erfolgt. Es werden Daten hinsichtlich Einsatz, Funktionsweise, Umfang und Implementierungsherausforderungen von Ressourcenplanungssystemen erhoben sowie erste Ergebnisse über aktuell eingesetzte Softwarelösungen zur personellen Ressourcenplanung präsentiert.
description: Despite increasing requirements and the broad availability of different software systems, there is no overview of the degree of digitization of human resource planning in intralogistics. To determine this degree, two questionnaires were developed to collect data from the perspectives of software-providing and warehouse-operating companies. Data regarding the usage, functionality, extent and implementation challenges of resource planning systems will be collected and initial preliminary results on software solutions currently used for human resource planning will be presented.
X-ray Selected Intermediate-Redshift Groups of Galaxies
Creators: name: Mulchaey, John S.
name: Lubin, Lori M.
name: Fassnacht, Chris
name: Rosati, Piero
name: Jeltema, Tesla E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present spectroscopic confirmation of nine moderate redshift galaxy groups and poor clusters selected from the ROSAT Deep Cluster Survey. The groups span the redshift range z=0.23-0.59 and have between 4 and 20 confirmed members. The velocity dispersions of these groups range from 125 to 650 km/s. Similar to X-ray groups at low redshift, these systems contain a significant number of early-type galaxies. Therefore, the trend for X-ray luminous groups to have high early-type fractions is already in place by at least z=0.5. In 4 of the 9 groups, the X-ray emission is clearly peaked on the most luminous early-type galaxy in the group. However, in several cases the central galaxy is composed of multiple luminous nuclei, suggesting that the brightest group galaxy may still be undergoing major mergers. In at least 3 of the groups in our sample, a dominant early-type galaxy is not found at the center of the group potential. This suggests that many of our groups are not dynamically evolved despite their high X-ray luminosities. While similar systems have been identified at low redshift, the X-ray luminosities of the intermediate redshift examples are one to three orders of magnitude higher than those of their low redshift counterparts. We suggest that this may be evidence for group downsizing: while massive groups are still in the process of collapsing and virializing at intermediate redshifts, only low-mass groups are in the process of forming at the present day.
description: 30 pages, 7 figures, Accepted for ApJ
Relativistic continuous matrix product states for quantum fields without cutoff
Creators: name: Tilloy, Antoine
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I introduce a modification of continuous matrix product states (CMPS) that makes them adapted to relativistic quantum field theories (QFT). These relativistic CMPS can be used to solve genuine 1+1 dimensional QFT without UV cutoff and directly in the thermodynamic limit. The main idea is to work directly in the basis that diagonalizes the free part of the model considered, which allows to fit its short distance behavior exactly. This makes computations slightly less trivial than with standard CMPS. However, they remain feasible and I present all the steps needed for the optimization. The asymptotic cost as a function of the bond dimension remains the same as for standard CMPS. I illustrate the method on the self-interacting scalar field, a.k.a. the $ϕ^4_2$ model. Aside from providing unequaled precision in the continuum, the numerical results obtained are truly variational, and thus provide rigorous energy upper bounds.
description: v2 - major update on the algorithm v1 - 14 pages - a shorter companion article in the same posting, "Variational method in relativistic quantum field theory without cutoff" presents the results more succinctly , without the details of some computations
Equivalence of conservation laws and equivalence of potential systems
Creators: name: Ivanova, Nataliya M.
name: Popovych, Roman O.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35A30; 35K57; 35K05

description: We study conservation laws and potential symmetries of (systems of) differential equations applying equivalence relations generated by point transformations between the equations. A Fokker-Planck equation and the Burgers equation are considered as examples. Using reducibility of them to the one-dimensional linear heat equation, we construct complete hierarchies of local and potential conservation laws for them and describe, in some sense, all their potential symmetries. Known results on the subject are interpreted in the proposed framework. This paper is an extended comment on the paper of J.-q. Mei and H.-q. Zhang [Internat. J. Theoret. Phys., 2006, in press].
description: 10 pages
title: Conan Doyle and Portugal
title: Political and Spiritual Causes and Travels
titleType: Subtitle
title: Conan Doyle e Portugal
title: As Causas Políticas e Espirituais e as Viagens
titleType: Subtitle
Creators: name: Brito, Maria João
Publisher: name: CETAPS, Centre for English, Translation and Anglo-Portuguese Studies, Faculdade de Ciências Sociais e Humanas, Universidade NOVA de Lisboa
Year: 2021

description: Although Sir Arthur Conan Doyle (1859-1930) is widely renowned as the creator of Sherlock Holmes, he was much more than that: a prolific writer, a spiritualist, and a traveler. Thus, the main aim of this article is to discuss the major contributions of his travel writings about Portugal. From this viewpoint, it will be analyzed, firstly, the historical and cultural context, i.e. the Victorian and Edwardian traveling habits and their connection to the consequences of the Industrial Revolution, regarding mainly a new geographical mobility; secondly, the article deals with Doyle’s visits to Portugal, the representation of the country in his writings and the complex relationships between the other and the self; and finally it is intended to demonstrate the influence of Portugal in Doyle’s fictional writings. Additionally, this article provides relevant material, such as news from periodicals and photographs of the time of his travels.
description: Brito, Maria João. Conan Doyle and Portugal: Political and Spiritual Causes and Travels. Revista de Estudos Anglo-Portugueses / Journal of Anglo-Portuguese Studies, n.º 30 (2021) pp. 171–199. ISSN: 0871-682X