cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Is transport in time-dependent random potentials universal ?
Creators: name: Krivolapov, Yevgeny
name: Fishman, Shmuel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The growth of the average kinetic energy of classical particles is studied for potentials that are random both in space and time. Such potentials are relevant for recent experiments in optics and in atom optics. It is found that for small velocities uniform acceleration takes place, and at a later stage fluctuations of the potential are encountered, resulting in a regime of anomalous diffusion. This regime was studied in the framework of the Fokker-Planck approximation. The diffusion coefficient in velocity was expressed in terms of the average power spectral density, which is the Fourier transform of the potential correlation function. This enabled to establish a scaling form for the Fokker-Planck equation and to compute the large and small velocity limits of the diffusion coefficient. A classification of the random potentials into universality classes, characterized by the form of the diffusion coefficient in the limit of large and small velocity, was performed. It was shown that one dimensional systems exhibit a large variety of novel universality classes, contrary to systems in higher dimensions, where only one universality class is possible. The relation to Chirikov resonances, that are central in the theory of Chaos, was demonstrated. The general theory was applied and numerically tested for specific physically relevant examples.
description: 5 pages, 3 figures
Flat 3-webs via semi-simple Frobenius 3-folds
Creators: name: Agafonov, Sergey I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53A60 (primary), 53D45 (secondary)

description: We construct flat 3-webs via semi-simple geometric Frobenius manifolds of dimension three and give geometric interpretation of the Chern connection of the web. These webs turned out to be biholomorphic to the characteristic webs on the solutions of the corresponding associativity equation. We show that such webs are hexagonal and admit at least one infinitesimal symmetry at each singular point. Singularities of the web are also discussed.
description: 13 pages, 1 figure
Biomechanical differences between young adults with and without a history of youth sport-related ankle injury
Creators: name: Russell, Monica
Publisher: name: Kinesiology
Year: 2022
Subjects: subject: biomechanics
subject: kinesiology
subject: biomedical engineering
subject: Education--Sciences

description: Ankle sprain injuries are common in youth sport and often have residual symptoms that linger years after the initial injury. These symptoms could include impaired balance and altered lower extremity joint kinematics and kinetics. Ankle sprain injury is strongly associated with the development of post-traumatic ankle osteoarthritis, with potential pathomechanisms linked to altered ankle joint loading. Thus, the primary objective of this research was to quantify differences in balance and lower extremity joint kinematics and kinetics between individuals who have sustained an ankle injury during youth sport 3 to 15 years prior to study participation compared to those with no history of lower extremity injury. The secondary objective of this study was to assess the impact of limb asymmetry and age on balance and lower extremity joint kinematics in individuals with and without ankle injury history during their youth. Balance did not differ between females with and without ankle sprain history. During walking, females with ankle sprain history demonstrated larger peak knee external rotation angle, larger peak knee extension angle, and larger peak hip flexion than uninjured controls. During a single-leg squat task, previously injured females displayed smaller peak ankle plantarflexion angle, peak knee extension angle, and peak hip external rotation angle than uninjured controls. Differences in ground reaction forces were observed during the walking and single-leg squat task between injured and uninjured females. During walking, older females displayed smaller peak ankle inversion, plantarflexion, hip abduction, and hip extension angles than younger females. During the SLS task, older females demonstrated a larger peak eversion angle and peak plantarflexion angle, and smaller peak knee external rotation and extension angles. . Small numbers of male participants limited analytic possibilities, however descriptively they may have a longer centre of pressure (COP) pathlength during the single-leg balance task compared to females. Male participants also seem to demonstrate different peaks in lower extremity joint kinematics compared to female participants. These results indicate long-term biomechanical effects of ankle sprain injuries, or pre-existing differences in biomechanics that may predispose certain individuals to ankle sprain injuries.
การวิเคราะห์ประสิทธิภาพการผลิตข้าวด้วยข้อมูลผสมระหว่างข้อมูลภาคตัดขวาง และข้อมูลอนุกรมเวลา
Creators: name: มาฆะสิริ เชาวกุล
Publisher: name: คณะบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร มหาวิทยาลัยนเรศวร
Year: 2561
Subjects: เขื่อนแควน้อยบำรุงแดน
ฟังก์ชั่นการผลิตข้าว
ประสิทธิภาพของการผลิต
ค่าความยืดหยุ่น
Kwae Noy Bumrungdan Dam
Rice Production Function
Efficiency of Input Used
Elasticity of Rice Production

description: วารสารบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร, 13, 1, 55-69
งบประมาณรายจ่ายของรัฐบาลที่มีผลต่อผลิตภัณฑ์มวลรวมภายในประเทศ
Creators: name: จักรพันธ์ ชัยทัศน์
Publisher: name: คณะบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร มหาวิทยาลัยนเรศวร
Year: 2561
Subjects: งบประมาณรายจ่ายจำแนกตามลักษณะงาน
ผลิตภัณฑ์มวลรวมภายในประเทศ
Budget Expenditures Classified by Functions
Gross Domestic Product

description: วารสารบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร, 13, 1, 101-114
Influence of atmospheric turbulence on states of light carrying orbital angular momentum
Creators: name: Rodenburg, Brandon
name: Lavery, Martin P. J.
name: Malik, Mehul
name: O'Sullivan, Malcolm N.
name: Mirhosseini, Mohammad
name: Robertson, David J.
name: Padgett, Miles
name: Boyd, Robert W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We have experimentally studied the degradation of mode purity for light beams carrying orbital angular momentum (OAM) propagating through simulated atmospheric turbulence. The turbulence is modeled as a randomly varying phase aberration, which obeys statistics postulated by Kolmogorov turbulence theory. We introduce this simulated turbulence through the use of a phase-only spatial light modulator. Once the turbulence is introduced, the degradation in mode quality results in cross-talk between OAM modes. We study this cross-talk in OAM for eleven modes, showing that turbulence uniformly degrades the purity of all the modes within this range, irrespective of mode number.
The prognostic value of ADAMTS8 and its role as a tumor suppressor in breast cancer
Creators: name: Zhang, Qia
name: Kanyomse, Quist
name: Luo, Chenghao
name: Mo, Qingfan
name: Zhao, XunPing
name: Wang, Long
name: Peng, Weiyan
name: Ren, Guosheng
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Hematology

description: A disintegrin-like and metalloprotease with therombospondin type1 motif 8 (ADAMTS8) plays an important role in many malignancies. However, the clinical and biological significance of ADAMTS8 in breast cancer remain unknown. In this study, the clinical data from 1066 breast cancer patients were analyzed by The Cancer Genome Atlas (TCGA) database, and were analyzed using the correlation between ADAMTS8 expression and the clinicopathological features and prognoses. The CCK-8 assay, clone formation assay, flow cytometry and Transwell assay were used to characterize the effects of ADAMTS8 on proliferation, migration and invasion of breast cancer cells. Gene set enrichment analysis (GSEA) and western blotting were used to identify the potential molecular mechanism on how ADAMTS8 exert its biological function. ADAMTS8 overexpression correlated longer overall survival (OS) and progression-free survival (PFS). ADAMTS8 was considered as an independent prognostic factor for OS. ADAMTS8 overexpression inhibited breast cancer cell proliferation, migration and invasion in vitro, and induced G2/M cell cycle arrest. ADAMTS8 was also involved in cell cycle regulation and was associated with the EGFR/Akt signaling pathway. ADAMTS8 knockdown showed the reverse effect. Together, the results showed that ADAMTS8 functioned as a tumor suppressor gene (TGS) and could be a prognostic biomarker for breast cancer.
Automated interpretation of congenital heart disease from multi-view echocardiograms
Creators: name: Wang, Jing
name: Liu, Xiaofeng
name: Wang, Fangyun
name: Zheng, Lin
name: Gao, Fengqiao
name: Zhang, Hanwen
name: Zhang, Xin
name: Xie, Wanqing
name: Wang, Binbin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Image and Video Processing (eess.IV)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Multimedia (cs.MM)
subject: Medical Physics (physics.med-ph)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Congenital heart disease (CHD) is the most common birth defect and the leading cause of neonate death in China. Clinical diagnosis can be based on the selected 2D key-frames from five views. Limited by the availability of multi-view data, most methods have to rely on the insufficient single view analysis. This study proposes to automatically analyze the multi-view echocardiograms with a practical end-to-end framework. We collect the five-view echocardiograms video records of 1308 subjects (including normal controls, ventricular septal defect (VSD) patients and atrial septal defect (ASD) patients) with both disease labels and standard-view key-frame labels. Depthwise separable convolution-based multi-channel networks are adopted to largely reduce the network parameters. We also approach the imbalanced class problem by augmenting the positive training samples. Our 2D key-frame model can diagnose CHD or negative samples with an accuracy of 95.4\%, and in negative, VSD or ASD classification with an accuracy of 92.3\%. To further alleviate the work of key-frame selection in real-world implementation, we propose an adaptive soft attention scheme to directly explore the raw video data. Four kinds of neural aggregation methods are systematically investigated to fuse the information of an arbitrary number of frames in a video. Moreover, with a view detection module, the system can work without the view records. Our video-based model can diagnose with an accuracy of 93.9\% (binary classification), and 92.1\% (3-class classification) in a collected 2D video testing set, which does not need key-frame selection and view annotation in testing. The detailed ablation study and the interpretability analysis are provided.
description: Published in Medical Image Analysis
Investor information and asset returns in production economies
Creators: name: Wang, Shubo
Publisher: name: University of British Columbia
Year: 2012

description: In this thesis, I explore the implications of investor information for asset returns in general equilibrium economies with production. In the first chapter, I study what determines the relationship between information quality and long-run risk in a Cox-Ingersoll-Ross type model with recursive preferences. Building on the recent work by Ai (2010), I separate the risk premium into the short-run and long-run components to highlight aspects of preferences that are important for this relationship. It is shown that the attitude towards temporal resolution of uncertainty determines the direction in which changes in information quality alter the compensation for long-run risk, while the elasticity of intertemporal substitution is important for the amplitude of this effect. In the second chapter, I investigate how incomplete information affects asset returns in a real business cycle model with Epstein-Zin preferences. In the model economy, productivity is altered by both transitory and permanent shocks. The representative agent observes movements in productivity but cannot perfectly distinguish their sources. As a result he must solve a signal extraction problem. This incomplete information model is found to be quantitatively consistent with some common observations about asset prices and aggregate quantities, including, for example, the equity premium, the risk-free rate, the price-dividend ratio and the dynamics of consumption and output. Furthermore, the model generates a downward sloping term structure of equity risk as empirically observed-namely, assets with short-duration of cash flows have larger risk premium and return volatility than assets with long-duration of cash flows.
ทิศทางการทำงานนิพนธ์และวิทยานิพนธ์ ของหลักสูตรบริหารธุรกิจมหาบัณฑิต สำหรับผู้บริหาร วิทยาลัยพาณิชยศาสตร์ มหาวิทยาลัยบูรพา
Creators: name: บรรพต วิรุณราช
Publisher: name: คณะบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร มหาวิทยาลัยนเรศวร
Year: 2561
Subjects: งานนิพนธ์
วิทยานิพนธ์
บริหารธุรกิจ
Writing
Thesis
Business Administration

description: วารสารบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร, 13, 1, 115-123
Dynamics of single neutral impurity atoms immersed in an ultracold gas
Creators: name: Spethmann, Nicolas
name: Kindermann, Farina
name: John, Shincy
name: Weber, Claudia
name: Meschede, Dieter
name: Widera, Artur
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We report on controlled doping of an ultracold Rb gas with single neutral Cs impurity atoms. Elastic two-body collisions lead to a rapid thermalization of the impurity inside the Rb gas, representing the first realization of an ultracold gas doped with a precisely known number of impurity atoms interacting via s-wave collisions. Inelastic interactions are restricted to a single three-body recombination channel in a highly controlled and pure setting, which allows to determine the Rb-Rb-Cs three-body loss rate with unprecedented precision. Our results pave the way for a coherently interacting hybrid system of individually controllable impurities in a quantum many-body system.
Catalog Matching with Astrometric Correction and its Application to the Hubble Legacy Archive
Creators: name: Budavari, Tamas
name: Lubow, Stephen H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Object cross-identification in multiple observations is often complicated by the uncertainties in their astrometric calibration. Due to the lack of standard reference objects, an image with a small field of view can have significantly larger errors in its absolute positioning than the relative precision of the detected sources within. We present a new general solution for the relative astrometry that quickly refines the World Coordinate System of overlapping fields. The efficiency is obtained through the use of infinitesimal 3-D rotations on the celestial sphere, which do not involve trigonometric functions. They also enable an analytic solution to an important step in making the astrometric corrections. In cases with many overlapping images, the correct identification of detections that match together across different images is difficult to determine. We describe a new greedy Bayesian approach for selecting the best object matches across a large number of overlapping images. The methods are developed and demonstrated on the Hubble Legacy Archive, one of the most challenging data sets today. We describe a novel catalog compiled from many Hubble Space Telescope observations, where the detections are combined into a searchable collection of matches that link the individual detections. The matches provide descriptions of astronomical objects involving multiple wavelengths and epochs. High relative positional accuracy of objects is achieved across the Hubble images, often sub-pixel precision in the order of just a few milli-arcseconds. The result is a reliable set of high-quality associations that are publicly available online.
description: 9 pages, 9 figures, accepted for publication in the Astrophysical Journal
Application of cross correlations between CMB and large scale structure to constraints on the primordial non-Gaussianity
Creators: name: Takeuchi, Yoshitaka
name: Ichiki, Kiyotomo
name: Matsubara, Takahiko
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The primordial non-Gaussianity of local type affects the clustering of dark matter halos, and the planned deep and wide photometric surveys are suitable for examining this class of non-Gaussianity. In our previous paper, we investigated the constraint from the cross correlation between CMB lensing potential and galaxy angular distribution on the primordial non-Gaussianity, without taking into account redshift slicing. To improve our previous analysis, in this paper, we add the galaxy lensing shear into our analysis and take into account redshift slicing to follow the redshift evolution of the clustering. By calculating 81 power spectra and using the Fisher matrix method, we find that the constraint on the primordial non-Gaussianity can be improved from ΔfNL \sim 5.4 to 5.1 by including the galaxy-galaxy lensing shear cross correlations expected from the Hyper Suprime-Cam survey (HSC), in comparison with the constraint without any cross correlations. Moreover, the constraint can go down to ΔfNL \sim 4.8 by including the galaxy-CMB lensing cross correlations from the ACTPol and Planck experiments.
description: 17 pages, 9 figuers, 7 tables, published in Phys. Rev. D 2012
Success in Apprenticeship (www.successinapprenticeship.ca)
Creators: name: Bow Valley College
Publisher: name: Bow Valley College
Year: 2022
Subjects: Apprenticeship programs
Reading
Trades-focused
Foundational skills
Authentic materials
Skills for success
Essential skills
Using documents
Document use
Numeracy
Skill builders
Workplace activities
Math practice worksheets
Adult literacy
Workplace skills
Technical training
Apprenticeship
Pre-apprenticeship
Skilled trades

description: Bow Valley College, in partnership with stakeholders from across Canada, and through funding from Employment and Social Development Canada (ESDC), led a five-year project between 2017-2022 to validate the importance of foundational skills (essential skills) training within technical training. The Success in Apprenticeship trades-focused learning materials and resources are the result of this national piloting project. Use this site to access trades-focused materials and resources to build or refresh the skills that support success in apprenticeship.
Reprinting the telegraph: Replicating the Vail register using multi-materials 3D printing
Creators: name: Alonso, Matthew
name: Malone, E
name: Moon, FC
name: Lipson, H
Publisher: name: University of Illinois at Chicago
Year: 2021
Subjects: Uncategorized

description: Solid Freeform Fabrication is a family of manufacturing processes that create three-dimensional objects by depositing material, layer-by-layer. Traditionally, this technology has been used to fabricate passive parts, but recently it has been used for producing active components such as batteries and soft-polymer actuators. In this paper we demonstrate the ability of this process to fabricate a complete, active electromechanical system. Using only SFF processes, we reproduced the 1844 Vail register - a landmark in digital communications history. With the techniques developed in this research, a range of solenoid devices can be fabricated and embedded into freeform fabricated devices. This could enable the realization of novel and otherwise difficult to manufacture electromechanical designs.
Север и рынок. Формирование экономического порядка, Выпуск 22018
Creators: name: Кольский научный центр Российской академии наук
Publisher: name: Север и рынок. Формирование экономического порядка
Year: 2018

description: , Выпуск 22018
description: Журнал «Север и рынок: формирование экономического порядка» является одним из ведущих научных изданий по социальным и экономическим проблемам устойчивого развития российского Севера и Арктики. Важнейшим направлением публикуемых статей является анализ и прогнозирование динамики социально-экономических процессов в северных и арктических регионах с учетом влияния глобальных, национальных и региональных факторов, определяющих развитие территорий с экстремальными условиями жизнедеятельности и хозяйствования. Тематический спектр публикаций достаточно обширен и включает вопросы рационального экологосбалансированного природопользования, промышленной и инновационной политики, социальной политики, финансового регулирования и межбюджетных отношений, формирования социальной, производственной, энергетической и транспортной инфраструктуры, развития международного сотрудничества на Севере и в Арктике, в том числе в рамках Баренцева Евро-Арктического региона.
On range and local time of many-dimensional submartingales
Creators: name: Menshikov, Mikhail
name: Popov, Serguei
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G42, 60J10

description: We consider a discrete-time process adapted to some filtration which lives on a (typically countable) subset of $\mathbb{R}^d$, $d\geq 2$. For this process, we assume that it has uniformly bounded jumps, is uniformly elliptic (can advance by at least some fixed amount with respect to any direction, with uniformly positive probability). Also, we assume that the projection of this process on some fixed vector is a submartingale, and that a stronger additional condition on the direction of the drift holds (this condition does not exclude that the drift could be equal to 0 or be arbitrarily small). The main result is that with very high probability the number of visits to any fixed site by time $n$ is less than $n^{1/2-δ}$ for some $δ>0$. This in its turn implies that the number of different sites visited by the process by time $n$ should be at least $n^{1/2+δ}$.
description: 23 pages, 8 figures; to appear in Journal of Theoretical Probability
The axioms for n-angulated categories
Creators: name: Bergh, Petter Andreas
name: Thaule, Marius
Publisher: name: arXiv
Year: 2011
Subjects: subject: Category Theory (math.CT)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 18E30

description: We discuss the axioms for an n-angulated category, recently introduced by Geiss, Keller and Oppermann. In particular, we introduce a higher octahedral axiom, and show that it is equivalent to the mapping cone axiom for an n-angulated category. For a triangulated category, the mapping cone axiom, our octahedral axiom and the classical octahedral axiom are all equivalent.
description: 17 pages, added a section, updated references
Sloshing of the Magnetized Cool Gas in the Cores of Galaxy Clusters
Creators: name: ZuHone, J. A.
name: Markevitch, M.
name: Lee, D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: X-ray observations of many clusters of galaxies reveal the presence of edges in surface brightness and temperature, known as "cold fronts". In relaxed clusters with cool cores, these edges have been interpreted as evidence for the "sloshing" of the core gas in the cluster's gravitational potential. The smoothness of these edges has been interpreted as evidence for the stabilizing effect of magnetic fields "draped" around the front surfaces. To check this hypothesis, we perform high-resolution magnetohydrodynamics simulations of magnetized gas sloshing in galaxy clusters initiated by encounters with subclusters. We go beyond previous works on the simulation of cold fronts in a magnetized intracluster medium by simulating their formation in realistic, idealized mergers with high resolution (Δx ~ 2 kpc). Our simulations sample a parameter space of plausible initial magnetic field strengths and field configurations. In the simulations, we observe strong velocity shears associated with the cold fronts amplifying the magnetic field along the cold front surfaces, increasing the magnetic field strength in these layers by up to an order of magnitude, and boosting the magnetic pressure up to near-equipartition with thermal pressure in some cases. In these layers, the magnetic field becomes strong enough to stabilize the cold fronts against Kelvin-Helmholtz instabilities, resulting in sharp, smooth fronts as those seen in observations of real clusters. These magnetic fields also result in strong suppression of mixing of high and low-entropy gas in the cluster, seen in our simulations of mergers in the absence of a magnetic field. As a result, the heating of the core due to sloshing is very modest and is unable to stave off a cooling catastrophe.
description: 28 pages, 39 figures, accepted to the Astrophysical Journal. Text matches accepted version with proof corrections. Some figures degraded due to size constraints
Noncommutative homogeneous spaces: the matrix case
Creators: name: Banica, Teodor
name: Skalski, Adam
name: Soltan, Piotr
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: Given a quantum subgroup $G\subset U_n$ and a number $k\leq n$ we can form the homogeneous space $X=G/(G\cap U_k)$, and it follows from the Stone-Weierstrass theorem that $C(X)$ is the algebra generated by the last $n-k$ rows of coordinates on $G$. In the quantum group case the analogue of this basic result doesn't necessarily hold, and we discuss here its validity, notably with a complete answer in the group dual case. We focus then on the "easy quantum group" case, with the construction and study of several algebras associated to the noncommutative spaces of type $X=G/(G\cap U_k^+)$.
description: 24 pages
Singular response to a dopant of an evaporating crystal surface
Creators: name: Popkov, Vladislav
name: Politi, Paolo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Moving crystal surfaces can undergo step-bunching instabilities, when subject to an electric current. We show analytically that an infinitesimal quantity of a dopant may invert the stability, whatever the sign of the current. Our study is relevant for experimental results [S. S. Kosolobov et al., JETP Lett. 81, 117 (2005)] on an evaporating Si(111) surface, which show a singular response to Au doping, whose density distribution is related to inhomogeneous Si diffusion.
description: 5 pages. To be published in PRB-Rapid Communications
Obtaining gauge invariant actions via symplectic embedding formalism
Creators: name: Abreu, E. M. C.
name: Neto, J. Ananias
name: Mendes, A. C. R.
name: Neves, C.
name: Oliveira, W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Superconductivity (cond-mat.supr-con)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The concept of gauge invariance is one of the most subtle and useful concepts in modern theoretical physics. It is one of the Standard Model cornerstones. The main benefit due to the gauge invariance is that it can permit the comprehension of difficult systems in physics with an arbitrary choice of a reference frame at every instant of time. It is the objective of this work to show a path of obtaining gauge invariant theories from non-invariant ones. Both are named also as first- and second-class theories respectively, obeying Dirac's formalism. Namely, it is very important to understand why it is always desirable to have a bridge between gauge invariant and non-invariant theories. Once established, this kind of mapping between first-class (gauge invariant) and second-class systems, in Dirac's formalism can be considered as a sort of equivalence. This work describe this kind of equivalence obtaining a gauge invariant theory starting with a non-invariant one using the symplectic embedding formalism developed by some of us some years back. To illustrate the procedure it was analyzed both Abelian and non-Abelian theories. It was demonstrated that this method is more convenient than others. For example, it was shown exactly that this embedding method used here does not require any special modification to handle with non-Abelian systems.
description: 20 pages. Two-column format. Final version to appear in Annalen der Physik. arXiv admin note: substantial text overlap with arXiv:1001.2254, arXiv:hep-th/0109089
CO2 Sequestration through Mineral Carbonation
Creators: name: Bader, Alex
Publisher: name: Science
Year: 2022
Subjects: subject: CO2 Sequestration
subject: Carbon Capture
subject: Geology
subject: FOS: Earth and related environmental sciences

description: Anthropogenic greenhouse gas emissions have become a subject of increasing concern because of their association with global climate change. Carbon dioxide (CO2) is the most prevalent anthropogenic greenhouse gas, and hence reduction of CO2 concentration in the atmosphere has become an important area of research. Subsurface (geologic) storage has been proposed as a target for CO2 storage; physical, residual and solubility trapping are possible storage mechanisms. An additional promising mechanism for geologic CO2 storage is permanent fixation by means of mineral trapping. This thesis explores the use of unconventional reservoirs such as shales and siltstones as a target for mineral trapping of CO2. Although some studies of CO2 storage in shales and low-permeability (tight) reservoirs exist, most previous studies of shales related to CO2 storage have primarily focused on the evaluation of shale as a caprock to contain CO2 within more conventional reservoirs. Such studies have concentrated on caprock mechanical integrity as it pertains to leakage instead of reactivity or geochemical modification in the shale. In this research, CO2 storage in shales and siltstones is evaluated with a focus on the potential for mineral trapping. An innovative workflow and custom reactor were designed to evaluate this potential for low-permeability Montney siltstone and Duvernay shale samples, and specifically their interaction with CO2-charged brine at simulated reservoir conditions. Prior to analysis of the Montney and Duvernay samples, olivine samples were studied with the new workflow/reactor as a proof of concept. Olivine is well-known to generate carbonate at high CO2 pressures (PCO2) and high temperature in alkaline solutions. San Carlos Olivine was therefore used as a control group and tested at 150°C/150bar in a 1M NaCl + 0.64M NaHCO3 solution. Extensive conversion of the olivine to magnesite and amorphous silica was observed, confirming the viability of the new workflow and functionality of the designed reactor. Montney and Duvernay samples were then tested at 150°C/150bar in synthetic reservoir brine. Both samples underwent extensive dissolution with minor precipitation of secondary phases. Most of the precipitation occurred as an artifact of depressurization post experiment, where the Montney precipitated hematite and the Duvernay precipitated calcite. A second Montney test was conducted at 150°C/150bar in a 1M NaCl + 0.64M NaHCO3 solution to promote precipitation. In this test, precipitation of siderite occurred, but dissolution still dominated. As a result of these experiments, there appears to be limited potential for CO2 storage in the form of mineral trapping in the Montney and Duvernay reservoirs. However, the observed CO2 interactions have important implications for enhanced oil recovery in tight oil reservoirs hosted in the Montney and Duvernay formations.
Food Service in Private Elementary and Secondary Schools
Creators: name: Kriesberg, Martin
name: Kriesberg, Martin
Publisher: name: Unknown
Year: 1964
Subjects: subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: Marketing
subject: FOS: Economics and business
subject: Research Methods/ Statistical Methods

description: Excerpt from the report: The study reported here was made to determine the current status of private school feeding programs in the United States and the extent to which pupils participate, and to analyze the factors associated with school and pupil participation. Findings are based on a representative National sample of about 5 percent of the approximately 15,300 private elementary and secondary schools in the 50 States.
Food Service in Public Schools
Creators: name: Kriesberg, Martin
name: Kriesberg, Martin
Publisher: name: Unknown
Year: 1964
Subjects: subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: Marketing
subject: FOS: Economics and business
subject: Research and Development/Tech Change/Emerging Technologies

description: Excerpt from the report: The survey reported here was conducted in March 1962 to determine the current status of feeding programs in public schools in the United States and the extent of pupil participation, and to analyze the factors associated with school and pupil participation in the National School Lunch Program. The findings permit a comparison with the benchmark data provided by a similar survey made in March 1957. The earlier data, together with responses to questions in the 1962 survey regarding school plans for food service facilities, permit projections for the years ahead and hence provide data for policy decision.
MOESM2 of Increased activated regulatory T cell subsets and aging Treg-like cells in multiple myeloma and monoclonal gammopathy of undetermined significance: a case control study
Creators: name: Wang, Ji-nuo
name: Cao, Xin-xin
name: Zhao, Ai-lin
name: Cai, Hao
name: Wang, Xuan
name: Li, Jian
Publisher: name: figshare
Year: 2018
Subjects: subject: Biophysics
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Pharmacology
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer
subject: Hematology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 2. The gating strategy of CD28â Treg-like cells. Phenotype of Treg-like cell subsets. (A) PBMCs or BMMCs were gated on FSC, SSC and analyzed for lymphocytes. (B) Percentages of CD4+ T cells gated on CD4 and SSC. (C) Percentages of CD4+FoxP3+ cells gated on FoxP3 and SSC. (D) Percentages of CD4+CD28â FoxP3+ cells gated on CD28 and FSC. Representative dot plots are shown for an untreated MM patient.
A Scoping Review Protocol of the Teaching Portfolio in Higher Education: Past, Purposes, Processes, and Practices
Creators: name: Jeffs, Cheryl
name: Hayden, Alix
name: Rutherford, Shauna
Publisher: name: Taylor Institute of Teaching and Learning
Year: 2022
Subjects: higher education
teaching portfolio
teaching dossier
scoping review
scoping review protocol

description: The teaching portfolio in higher education has emerged as a common requirement for tenure, promotion, awards, and career advancement. The purpose of this scoping review is to address the broad question What is known about the teaching portfolio in higher education? The specific categories to be explored are the history and definitions, the purposes, institutional processes, and the practice of individuals developing a teaching portfolio
Lassoing saddle splay and the geometrical control of topological defects
Creators: name: Tran, Lisa
name: Lavrentovich, Maxim O.
name: Beller, Daniel A.
name: Li, Ningwei
name: Stebe, Kathleen J.
name: Kamien, Randall D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Systems with holes, such as colloidal handlebodies and toroidal droplets, have been studied in the nematic liquid crystal (NLC) 4-cyano-4'-pentylbiphenyl (5CB): both point and ring topological defects can occur within each hole and around the system, while conserving the system's overall topological charge. However, what has not been fully appreciated is the ability to manipulate the hole geometry with homeotropic (perpendicular) anchoring conditions to induce complex, saddle-like deformations. We exploit this by creating an array of holes suspended in an NLC cell with oriented planar (parallel) anchoring at the cell boundaries. We study both 5CB and a binary mixture of bicyclohexane derivatives (CCN-47 and CCN-55). Through simulations and experiments, we study how the bulk saddle deformations of each hole interact to create novel defect structures, including an array of disclination lines, reminiscent of those found in liquid crystal blue phases. The line locations are tunable via the NLC elastic constants, the cell geometry, and the size and spacing of holes in the array. This research lays the groundwork for the control of complex elastic deformations of varying length scales via geometrical cues in materials that are renowned in the display industry for their stability and easy manipulability.
description: 9 pages, 7 figures, 1 supplementary figure
Exploring Undergraduate Nursing Students' Experiences of End-of-Life Conversations
Creators: name: D'Souza, Cheryl
Publisher: name: Nursing
Year: 2022
Subjects: subject: Nursing students
subject: End-of-life conversations
subject: Experiences
subject: Nursing
subject: FOS: Health sciences

description: Nurses report that communicating with patients and families about End of Life (EOL) issues is one of the most challenging aspects of providing EOL care. Many nurses enter practice not feeling prepared or confident to talk about death and dying, and research related to how student nurses encounter EOL conversations in their practicums is lacking. We investigated final year undergraduate nursing students’ experiences of having EOL conversations with patients and family members in their clinical settings. Semi-structured interviews were conducted and analysed using Braun and Clark’s (2006) framework of thematic analysis (TA). A total of five participant interviews were conducted and analysed to yield the following four themes: attitudes towards death and death talk; nursing students’ inner world during EOL conversations; recognizing, communicating, and responding to patients; and the student nurse role in EOL conversations. For nursing students, engaging in EOL conversations with patients and their families is experienced as a complex intellectual and emotional process. Students often fear saying the wrong thing and feel uncertain in knowing how to navigate these conversations. Implications for practice include addressing the gaps in EOL communication content and training in the nursing programs.
Independence and matching numbers of some token graphs
Creators: name: de Alba, Hernan
name: Carballosa, Walter
name: Leaños, Jesús
name: Rivera, Luis Manuel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C10, 05C69

description: Let $G$ be a graph of order $n$ and let $k\in\{1,\ldots,n-1\}$. The $k$-token graph $F_k(G)$ of $G$, is the graph whose vertices are the $k$-subsets of $V(G)$, where two vertices are adjacent in $F_k(G)$ whenever their symmetric difference is an edge of $G$. We study the independence and matching numbers of $F_k(G)$. We present a tight lower bound for the matching number of $F_k(G)$ for the case in which $G$ has either a perfect matching or an almost perfect matching. Also, we estimate the independence number for bipartite $k$-token graphs, and determine the exact value for some graphs.
description: 16 pages, 4 figures. Third version is a major revision. Some proofs were corrected or simplified. New references added
Multivariate General Compound Hawkes and Point Processes with Financial Applications
Creators: name: Guo, Qi
Publisher: name: Science
Year: 2022
Subjects: subject: Hawkes processes
subject: multivariate general compound Hawkes processes
subject: limit order books
subject: point processes
subject: functional central limit theorems
subject: law of large numbers
subject: asset-liability management
subject: option pricing
subject: Education--Mathematics
subject: Economics--Finance

description: The Hawkes process (HP) significantly affected the financial modeling area in the past 15 years, especially high-frequency trading. This thesis focuses on various new Hawkes processes and considers their applications in the limit order book (LOB). Preexisting studies of the HP in the LOB showed that the arrivals of orders could be modeled by univariate or multivariate HP because of its long memory property and clustering effect. Therefore, we propose the multivariate general compound Hawkes process (MGCHP), a stochastic model for the mid-price in the LOB. For the MGCHP, we prove the Law of Large Numbers (LLN) and two Functional Central Limit Theorems (FCLT); the latter provides insights into the link between price volatilities and order flows in limit order books with several assets. The parameter estimation for the high-dimensional Hawkes process is always time-consuming. This motivates us to consider a generalization of the MGCHP. We replace the multivariate HP with a more general point process, and we call it the multivariate general compound point process (MGCPP). We also prove limit theorems for the MGCPP and compared numerical simulations for the MGCPP with the MGCHP. The MGCHP model provides us with a perfect framework for the stock price dynamics in the LOB. It’s natural to apply it to other financial applications. We extend the MGCHP to the exponential MGCHP (EMGCHP) and consider the corresponding asset-liability management problem. Risky assets are molded by the EMGCHP while the liability follows a Brownian motion with drift. We derive the Hamilton–Jacobi–Bellman equation and transformed it into a system of PDEs. With the FCLT, we can approximate the EMGCHP to a geometric Brownian motion in the LOB and apply Xie et al.’s results. Numerical simulations for the Hawkes-based model and comparisons with the Poisson-based model are also provided. In the last part of the thesis, we give an option pricing formula under the EMGCHP framework. We believe our study can provide a strong tool for not only researchers but also traders in the high-frequency market.
Free induction decay of single spins in diamond
Creators: name: Maze, Jeronimo R
name: Dréau, Anaïs
name: Waselowski, Victor
name: Duarte, Hector
name: Roch, Jean-François
name: Jacques, Vincent
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study both theoretically and experimentally the free induction decay (FID) of the electron spin associated with a single nitrogen-vacancy defect in high purity diamond, where the main source of decoherence is the hyperfine interaction with a bath of $^{13}$C nuclear spins. In particular, we report a systematic study of the FID signal as a function of the strength of a magnetic field oriented along the symmetry axis of the defect. On average, an increment of the coherence time by a factor of $\sqrt{5/2}$ is observed at high magnetic field in diamond samples with a natural abundance of $^{13}$C nuclear spins, in agreement with numerical simulations and theoretical studies. Further theoretical analysis shows that this enhancement is independent of the concentration of nuclear spin impurities. By dividing the nuclear spin bath into shells and cones, we theoretically identify which nuclear spins are responsible for the observed dynamics.
description: 16 pages, 7 figures
The relationships between subjectively evaluated perceptual qualities and the relative occurrence rate in informal learning spaces
Creators: name: Kalef, Ryan
Publisher: name: University of British Columbia
Year: 2012

description: Previous research on the acoustic properties of learning environments employed standard acoustic parameters, such as Leq, Reverberation Time and the Speech Intelligibility Index. These acoustic properties did not correlate strongly with subjectively evaluated perceptual qualities (subjective qualities) of acoustic environment, such as fatigue, annoyance, distraction, stress, difficulty hearing, and difficulty talking. The present study had the purpose of developing a novel acoustic measure, the Relative Occurrence Rate (ROR), of learning spaces that is based on the measuring of temporal variation of an acoustic environment. This measure was derived by modifying the Occurrence Rate (OR) parameter introduced by Sbhihi et al (2010). This measure of sound level variation over time was correlated with subjective qualities obtained from a questionnaire administered in a previous study of informal learning spaces by Hodgson and colleagues in 2010. The results showed that significant correlations exist between ROR and the subjective qualities of fatigue, annoyance, distraction, stress, difficulty talking, difficulty hearing, people and continuous noise.
Foundations in Open Educational Resources (OER) Workshop Presentation
Creators: name: Adams, Sarah
Publisher: name: Libraries and Cultural Resources
Year: 2022
Subjects: Open educational resources
Library outreach
Library workshop
Creative Commons
Learning object

description: This workshop will provide learners with an understanding about what OERs are, approaches for integrating them into teaching and learning practices, and ways for accessing and assessing OER resources and tools. The workshop will consist of key learnings, helpful resources, and activities to equip participants with the skills they need to achieve their goals for teaching with OER. Means for continuing the discussion on creating OERs will be provided at the end of the session. At the end of this workshop, learners will be able to: Define open educational resources (OER), copyright, and open licenses; Understand the implications copyright and open licensing have on the adoption, adaptation, and creation of OER; Describe the key considerations for assessing and adopting an OER; Identify ways of incorporating OER into their teaching and learning practices; Conduct a preliminary search using key search tools for finding OER, openly licensed media, and ancillary content.
Jogo Digital EcoEscape
Creators: name: Sousa Araújo, Raiane
Publisher: name: Zenodo
Year: 2025
Subjects: Gamificação
Educação Ambiental
Educação para a sustentabilidade
Escape Room
Poluição plástica

description: O EcoEscape é um jogo educativo digital em formato de escape room, desenvolvido para promover a conscientização ambiental entre estudantes do ensino médio integrado, com foco na problemática da poluição plástica. A proposta gamificada apresenta salas interativas com desafios que incluem perguntas de múltipla escolha, verdadeiro ou falso, associação, análise de imagens e vídeos. Cada resposta incorreta oferece explicações educativas, transformando erros em oportunidades de aprendizagem. O jogo estimula o raciocínio lógico, a colaboração e o pensamento crítico, contribuindo para o desenvolvimento de atitudes sustentáveis. Ideal para ser utilizado por professores como ferramenta pedagógica inovadora em aulas de Ciências, Biologia e Educação Ambiental.