cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Parallel techniques for construction of trees and related problems
Creators: name: Przytycka, Teresa Maria
Publisher: name: University of British Columbia
Year: 2011

description: The concept of a tree has been used in various areas of mathematics for over a century. In particular, trees appear to be one of the most fundamental notions in computer science. Sequential algorithms for trees are generally well studied. Unfortunately many of these sequential algorithms use methods which seem to be inherently sequential. One of the contributions of this thesis is the introduction of several parallel techniques for the construction of various types of trees and the presentation of new parallel tree construction algorithms using these methods. Along with the parallel tree construction techniques presented here, we develop techniques which have broader applications. We use the Parallel Random Access Machine as our model of computation. We consider two basic methods of constructing trees:tree expansion and tree synthesis. In the tree expansion method, we start with a single vertex and construct a tree by adding nodes of degree one and/or by subdividing edges. We use the parallel tree expansion technique to construct the tree representation for graphs in the family of graphs known as cographs. In the tree synthesis method, we start with a forest of single node subtrees and construct a tree by adding edges or (for rooted trees) by creating parent nodes for some roots of the trees in the forest. We present a family of parallel and sequential algorithms to construct various approximations to the Huffman tree. All these algorithms apply the tree synthesis method by constructing a tree in a level-by-level fashion. To support one of the algorithms in the family we develop a technique which we call the cascading sampling technique. One might suspect that the parallel tree synthesis method can be applied only to trees of polylogarithmic height, but this is not the case.We present a technique which we call the valley filling technique and develop its accelerated version called the accelerated valley filling technique. We present an application of this technique to an optimal parallel algorithm for construction of minimax trees.
Excitation functions of baryon anomaly and freeze-out properties at RHIC-PHENIX
Creators: name: Chujo, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The intermediate $p_T$ region (2 - 5 GeV/$c$) in central Au+Au collisions at RHIC has a rich physics content. The (anti)proton to pion ratio at the intermediate $p_T$ gives us a powerful tool to investigate the bulk properties of the hot and dense matter created at RHIC and their hadronization processes. We present the preliminary results of identified charged hadron spectra at the lower beam energies at RHIC. The excitation function of (anti)proton to pion ratios from SPS to RHIC are shown. We also discuss the onset of the baryon enhancement at the high energy heavy ion collisions.
description: 4 pages, 3 figures, Quark Matter 2006 conference proceedings
data--about F association.doc
Creators: name: yang, chao
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 430203
subject: Cultural heritage management (incl. world heritage)
classificationCode: 430208
subject: Intangible heritage

description: Trade associations are an important element of the ICH conservation system.Data from the F association were collected mainly fromWeChat official accounts, news reports, and internal summary reports of the association.
Energetics of the PH-Pfaffian state and the 5/2-fractional quantum Hall effect
Creators: name: Rezayi, Edward H.
name: Pakrouski, Kiryl
name: Haldane, F. D. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a method for the exact construction of the fully particle-hole symmetric PH-Pfaffian ground state and its charged excitations on a sphere. We adopt the Moore-Read state, but with a nonholomorphic pairing component as in previous studies, and project it to the lowest Landau level. We study the energetics as well as other properties of these states and find that in a pure system interacting with the Coulomb forces the PH-Pfaffian cannot compete with either the Moore-Read state or its particle-hole conjugate, the anti-Pfaffian state, as an explanation for the 5/2-effect.
Smoothing of an All-sky Survey Map with a Fisher-von Mises Function
Creators: name: Seon, Kwang-Il
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A convolution of the all-sky survey data with a smoothing function is crucial in calculating the smooth surface brightness of the sky survey data. The convolution is usually performed using a spherical version of the convolution theorem. However, a Gaussian function, applicable only in the flat-sky approximation, has been usually adopted as a smoothing kernel. In this paper, we present an exact analytic solution of the spherical-harmonics transformation of a Fisher-von Mises function, the mathematical version of a Gaussian function in spherical space. We also obtain the approximate solutions exp[-l(l + 1)/2k]. The exact and the approximate solutions may be useful when an astrophysical survey map is convolved with a smoothing function of k>1.
description: 4 pages, 2 figures, preprint version of the paper published in JKPS on March 15, 2006
La critique sociale chez Christiane Rochefort
Creators: name: Ainsley, Luc
Publisher: name: University of British Columbia
Year: 2010

description: In the footsteps of Simone de Beauvoir and André Malraux, Christiane Rochefort develops a social critique on the alienation of the individual in society. The study of two of her novels, Les Petits Enfants du siècle (1961) and Les Stances à Sophie (1963), reveals that this critique is first a denunciation of the system and its mechanics. Thanks to the prevailing ideology of consumption, which permits the standardization of individuals by standardizing their needs, the state machinery can exercise a closer monitoring on the human masses. Personal freedom is also denied on the social and family levels: everyone's own image is sold as a merchandise; there is no real contact anymore (transcendence) between the individuals themselves, and individuals and objects; at the family level, alienation is linked to verbal compliance and to the absence of all authentic speech, free of clichés. Thus, relationships are altered. Just as for their individual happiness, now they are filtered through objects and have lost their humanness. The other side of this social criticism, the critique of the social classes, touches the questions of valorization and status linked to the individual's possessions and not to his heridity. In the first novel the valorization of the proletarian woman depends on her fecundity while the upper middle-class woman (la bourgeoise), in Les Stances is valorized according to aesthetic criterions. Emphasized also is the importance of the woman's fight to maintain her identity and her freedom: a rebellion which deals with her sexuality and brings the end of reciprocal relationships in the couple's dynamics.
EFFECT OF THERMOPLASTIC NYLON AND POLYETHERETHERKETONE DENTURE BASE IN ALKALINE PEROXIDE AND CASTOR OIL DENTURE CLEANSER ON WATER SORPTION AND COLOR STABILITY
Creators: name: ERVI GANI
name: PUTRI WELDA UTAMI RITONGA
name: HASLINDA Z TAMIN
name: URIP HARAHAP
Publisher: name: Zenodo
Year: 2023
Subjects: Castor Oil, Color Stability, Polyetheretherketone, Thermoplastic Nylon, Water Sorption

description: Abstract

Alkaline peroxide is effective and the most widely used denture cleanser. However, some studies encountered the disadvantage of the oxidative process results that affected the chemical and physical properties of denture base. Thus, castor oil has been studied as herbal denture cleanser with bactericidal and fungicidal effect without changes in water sorption and color stability of denture base. High water sorption and low color stability are problems that mostly encountered in themoplastic nylon material. Therefore, polyetheretherketone (PEEK) has been introduced as denture base material. The purpose of this study was to observe the effect of immersion of thermoplastic nylon and polyetheretherketone denture base in alkaline peroxide and castor oil denture cleanser on water sorption and color stability. Thirty samples with a diamater of 15 mm and thickness of 1 mm were used in this study. Samples were divided into six groups (n=5), such as thermoplastic nylon and polyetheretherketone that were each immersed in distilled water, alkaline peroxide and 10% castor oil denture cleanser. Water sorption test was weighed using digital analytical balance and calculated into percentage using Kazanji and Watkinson method. Color stability test was performed using colorimeter and calculated based on the formula (ΔE). Unpaired T Test showed significant difference on water sorption and color stability between thermoplastic nylon and polyetheretherketone denture base after immersion in each alkaline peroxide and 10% castor oil denture cleanser with p value =0.0001 (p<0.05). Besides, One way Anova test also showed significant effect on water sorption and color stability in each nylon thermoplastic and polyethertetherketone after immersion in distilled water, alkaline peroksida and 10% castor oil with p value =0.0001 (p<0.05). Based on the results of this study, it could be concluded that polyetheretherketone denture base could be suggested for dentist clinical used due to its good chemical and physical properties. Besides, castor oil 10% denture cleanser could also be used as denture cleanser due to its low water sorption and good color stability compared to alkaline peroxide on thermoplastic nylon and polyethertherketone denture base.
Geodesic structure and quasinormal modes of a tidally perturbed spacetime
Creators: name: Cardoso, Vitor
name: Foschi, Arianna
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Tidal perturbations play an important role in the study of the dynamics in the classical two-body system. Understanding tidal effects in strong-field regions may allow one to use gravitational-wave or electromagnetic observations to locate or constraint the location of possible companions. Here, we investigate how timelike and null geodesics of a Schwarzschild black hole are affected in the presence of a companion. There is a panoply of new effects. In some limiting cases, we find analytical solutions for closed null or timelike geodesics. Our results show that light ring period as measured by a far-away observer can be eiter shorter or longer, depending on the location of the companion. We also show that there are closed lightlike trajectories which are elliptic (for equatorial companions), and that timelike particles are affected in a similar manner. Finally, we attempt at estimating the ringdown from tidally perturbed geometries. Our results indicate that there are two stages in the relaxation of such geometries, one associated with a prompt decay of waves around the deformed photonsphere, and a later relaxation of the global geometry. These results are consistent with previous, full numerical studies.
description: 11 pages, 5 figures, revtex4. Comments are welcome
Isospin Symmetry of Fragmentation Functions
Creators: name: Chen, Kai-bao
name: Liang, Zuo-tang
name: Pan, Yan-lei
name: Song, Yu-kun
name: Wei, Shu-yi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We make a systematic study of the isospin symmetry of fragmentation functions by taking decay contributions into account. We assume the isospin symmetry in strong interactions and show that in the unpolarized case the isospin symmetry is held for fragmentation functions of $Λ$ and only tiny violations are allowed for other hadrons such as nucleon and pions due to the contributions from weak decays. We present a rough estimate of the magnitudes of such violations. In the polarized case, we show that the isospin symmetry violation for $Λ$ production should be tiny and the recent Belle data on the transverse polarization of $Λ$ can be reproduced if the isospin symmetry is kept in the corresponding polarized fragmentation functions.
description: 6 pages, 3 figures
The SuperNova Early Warning System
Creators: name: Scholberg, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A core collapse in the Milky Way will produce an enormous burst of neutrinos in detectors world-wide. Such a burst has the potential to provide an early warning of a supernova's appearance. I will describe the nature of the signal, the sensitivity of current detectors, and SNEWS, the SuperNova Early Warning System, a network designed to alert astronomers as soon as possible after the detected neutrino signal.
description: 3 pages, appearing in refereed proceedings of "Hotwiring the Transient Universe 2007", eds. A. Allan, J. S. Bloom, R. Seaman, Astron. Nachr. vol. 329, March 2008
Can the Brans-Dicke Gravity with $Λ$ Possibly be a Theory of Dark Matter?
Creators: name: Kim, Hongsu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The pure Brans-Dicke (BD) gravity with or without the cosmological constant $Λ$ has been taken as a model theory for the dark matter. Indeed, there has been a consensus that unless one modifies either the standard theory of gravity, namely, general relativity, or the standard model for particle physics, or both, one can never achieve a satisfying understanding of the phenomena associated with dark matter and dark energy. Along this line, our dark matter model in this work can be thought of as an attempt to modify the gravity side alone in the simplest fashion to achieve the goal. Among others, it is demonstrated that our model theory can successfully predict the emergence of dark matter halo-like configuration in terms of a self-gravitating spacetime solution to the BD field equations and reproduce the flattened rotation curve in this dark halo-like object in terms of the non-trivial energy density of the BD scalar field, which was absent in the context of general relativity where Newton's constant is strictly a ``constant'' having no dynamics. Our model theory, however, is not entirely without flaw, such as the prediction of relativistic jets in all types of galaxies which actually is not the case.
description: 34 pages, 2 figures, Revtex4, version appeared in J. Korean Phy. Soc
The entanglement character between atoms in the non-degenerate two photons Tavis-Cummings model
Creators: name: Zhang, Guo-feng
name: Chen, Zi-yu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The entanglement character including the so-called sudden death effect between atoms in the non-degenerate two photons Tavis-Cummings model is studied by means of concurrence. The results show that the so-called sudden death effect occurs only for some kind of initial states. In other words, the phenomenon is sensitive to the initial conditions. One can expect the resurrection of the original entanglement to occur in a periodic way following each sudden death event. The length of the time interval for the zero entanglement is dependent on not only the degree of entanglement of the initial state but also the initial state. And the influence of dipole-dipole interaction and different atomic initial states on entanglement between atoms are discussed. The sudden death effect can be weakened by the introducing of dipole-dipole interaction.
description: 1tex and 2 eps figures. accepted by Optics Communications
Consequences of Triaxiality for Gravitational Wave Recoil of black holes
Creators: name: Vicari, Alessandro
name: Capuzzo-Dolcetta, Roberto
name: Merritt, David
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Coalescing binary black holes experience a ``kick'' due to anisotropic emission of gravitational waves with an amplitude as great as 200$ km/s. We examine the orbital evolution of black holes that have been kicked from the centers of triaxial galaxies. Time scales for orbital decay are generally longer in triaxial galaxies than in equivalent spherical galaxies, since a kicked black hole does not return directly through the dense center where the dynamical friction force is highest. We evaluate this effect by constructing self-consistent triaxial models and integrating the trajectories of massive particles after they are ejected from the center; the dynamical friction force is computed directly from the velocity dispersion tensor of the self-consistent model. We find return times that are several times longer than in a spherical galaxy with the same radial density profile, particularly in galaxy models with dense centers, implying a substantially grea
description: 28 pages, including 13 eps figures. Submitted to ApJ
ความสามารถด้านการฟัง-พูดและแรงจูงใจต่อการเรียนภาษาอังกฤษของนักเรียนชั้นประถมศึกษาปีที่ 1 โรงเรียนชุมชนบ้านบ่อ ด้วยวิธีสอนภาษาเพื่อการสื่อสารโดยใช้เพลงและเกม
Creators: name: วารุณี ยะปาน
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2556
Subjects: ความสามารถดา้นการฟัง-พูด, แรงจูงใจ, นักเรียนชั้นประถมศึกษาปีที่ 1, เพลงและเกม

description: ฉบับพิเศษ, วารสารมนุษยศาสตร์และสังคมศาสตร์ มหาวิทยาลัยมหาสารคาม
Spontaneous Breaking of Classical PT Symmetry
Creators: name: Bender, Carl M.
name: Darg, Daniel W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The classical trajectories of the family of complex PT-symmetric Hamiltonians $H=p^2+x^2(ix)^ε$ ($ε\geq0$) form closed orbits. All such complex orbits that have been studied in the past are PT symmetric (left-right symmetric). The periods of these orbits exhibit an unusual dependence on the parameter $ε$. There are regions in $ε$ of smooth behavior interspersed with regions of rapid variation. It is demonstrated that the onset of rapid variation is associated with strange new kinds of classical trajectories that have never been seen previously. These rare kinds of trajectories are not PT symmetric and occur only for special rational values of $ε$.
description: 16 pages, 17 figures, accepted for publication in the Journal of Mathematical Physics
RF control of the M9 separator at TRIUMF
Creators: name: Burge, R.
Publisher: name: University of British Columbia
Year: 2010

description: High voltage RF systems are used to accelerate proton beams for nuclear physics experiments. The acceleration process shapes the proton beam into a train of narrow pulses with the same period as the RF. This bunched beam structure is used to separate and identify secondary particles that are produced when the proton beam is directed at a "target". An RF controller for a system that separates secondary particles was built. Control of high power RF cavities that operate near resonance is discussed. The emphasis is on developing a control model for resonant systems and building a control system based on hardware and software modules that can be easily configured for different RF systems.
ПРОДОЛЖИТЕЛЬНОСТЬ ВЕГЕТАЦИОННОГО ПЕРИОДА СОРТОВ ХЛОПЧАТНИКА И ГРЯД НА ПРИМЕРЕ КАШКАДАРЬИНСКОЙ ОБЛАСТИ
Creators: name: НАУЧНО-ИССЛЕДОВАТЕЛЬСКИЙ ИНСТИТУТ АГРОТЕХНОЛОГИЙ СЕЛЕКЦИИ, ПОСЕВА И ВОЗДЕЛЫВАНИЯ ХЛОПКА , k х.ф.д., проф., Намазов Шодман Эргашевич, научный руководитель,
name: Сын Хушвактова Маруф Сунат, базовый докторант 1 ступени Южного научно-исследовательского института сельского хозяйства
Publisher: name: Zenodo
Year: 2023

description: Фазы развития хлопчатника сегодня, определение их последовательности, изучение фаз по их морфологическим характеристикам и расчет продолжительности межфазных периодов.

         Ключевые слова: Хлопкоочистительная обработка; цветение, плод, физиологический, гребень, семя, стручок, волокно, стебель.
ความเข้าใจและแรงจูงใจต่อการอ่านภาษาอังกฤษของนักเรียนชั้นมัธยมศึกษาปีที่ 3 โรงเรียนบ้านหนองตาแต้ม(ราชประชานุกูล) ด้วยวิธีสอนตามแนวทฤษฎีการสอนภาษาแบบอรรถฐาน(GENRE-BASE APPROACH)โดยใช้อรรถลักษณะหนังสือพิมพ์ (NEWS REPORT GENRE FEATURES)
Creators: name: ภัทธิรา ศรีอ่อน
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2556
Subjects: ความเข้าใจ, แรงจูงใจ, นักเรียนชั้นมัธยมศึกษาปีที่ 3, วิธีสอนตามแนวทฤษฎีการสอนภาษาแบบอรรถฐานโดยใช้อรรถลักษณะหนังสือพิมพ์

description: ฉบับพิเศษ, วารสารมนุษยศาสตร์และสังคมศาสตร์ มหาวิทยาลัยมหาสารคาม
Deep GEMINI GMOS-IFU spectroscopy of BAL QSOs: I. Decoupling the BAL, QSO, starburst, NLR, supergiant bubbles and galactic wind in Mrk 231
Creators: name: Lipari, S.
name: Sanchez, S. F.
name: Bergmann, M.
name: Terlevich, R.
name: Garcia-Lorenzo, B.
name: Punsly, B.
name: Mediavilla, E.
name: Taniguchi, Y.
name: Ajiki, M.
name: Zheng, W.
name: Acosta, J.
name: Jahnke, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this work we present the first results of a study of BAL QSOs (at low and high redshift), based on very deep Gemini GMOS integral field spectroscopy. In particular, the results obtained for the nearest BAL IR QSO Mrk 231 are presented. Very deep three-dimensional spectra and maps clearly show that the BAL systems I and II are extended (reaching 1.4-1.6" = 1.2-1.3 kpc, from the nucleus) and clearly elongated at the position angle close to the radio jet PA. Which suggest that the BAL systems I and II are both associated with the radio jet, and supporting the bipolar jet-wind model for some BALs. For the nuclear region of Mrk 231, the QSO and host-galaxy components were modelled, using a new technique of decoupling 3D spectra. From this study, the following main results were found: (i) in the pure host galaxy spectrum an extreme nuclear starburst component was clearly observed, mainly as a very strong increase in the flux, at the blue wavelengths; (ii) the BAL system I is observed in the spectrum of the host galaxy; (iii) in the clean/pure QSO emission spectrum, only broad lines were detected. 3D GMOS individual spectra (specially in the IR Ca II triplet) and maps confirm the presence of an extreme and young nuclear starburst (8 < age < 15 Myr), which was detected mainly in a ring or toroid with a radius r = 0.3" = 200 pc, around the very nucleus. The physical properties of the four expanding nuclear bubbles were analysed, using the GMOS 3D spectra and maps. These results suggest that an important part of the nuclear NLR is generated by the OF process and the associated low velocity ionizing shocks.
description: 51 pages, 20 figures, Submitted MNRAS
Rural vulnerability and institutional dynamics in the context of COVID-19: A scoping review
Creators: name: John, Sokfa F.
name: Okem, Andrew Emmanuel
name: Mubangizi, Betty Claire
name: Adekanla, Niyi
name: Ngubane, Londeka P.
name: Barry, Ibrahim
Publisher: name: AOSIS
Year: 2022
Subjects: vulnerability
rural
resilience
livelihoods
COVID-19
adaptive capacity

description: This study reviewed the impact of the coronavirus disease 2019 (COVID-19) on pre-existing vulnerabilities in rural communities using the scoping review strategy. It focused on manuscripts published on the topic in 2020. Based on 39 studies that met our inclusion criteria (out of 507 studies), we note that COVID-19 is exacerbating pre-existing rural vulnerabilities, including poverty, remoteness, socio-economic marginalisation and high unemployment. There is limited evidence that rural communities are resilient to the pandemic. Reduction in household expenditures and the community food system are the only reported forms of resilience. Although local institutions are supporting rural communities in responding to the impacts of the pandemic, several institutional dynamics undermine the effectiveness of the response. The increased risk of the pandemic is likely to reduce incomes and standards of living amongst poor communities. Thus, coping strategies were identified such as starting small gardens in communities, diet changes, targeting community markets with produce rather than retailers and food swap using social media, with food swap being the most adopted coping strategy. Although this study does not offer a comprehensive picture of the levels and nature of vulnerability, resilience and institutional dynamics of rural communities in different parts of the world reveal the limitations of existing knowledge of the vulnerability of rural communities in the context of COVID-19. This underscores the importance of further studies on rural vulnerability in the context of COVID-19 that will enable evidence-based responses to the pandemic in rural contexts.
An exploratory study of early letter-sound knowledge in a low socio-economic context in South Africa
Creators: name: O'Carroll, Shelley
Publisher: name: Aosis publishing
Year: 2011
Subjects: letter knowledge
word reading
early intervention
emergent literacy

description: This paper explores one aspect of early literacy development in a low socio-economic context in South Africa. Assessments conducted with a sample of children from two disadvantaged communities in Cape Town indicated that in this context, almost half of the learners entering Grade One were unable to recognise any letters. A Grade R intervention conducted by volunteers showed that children from this context were able to learn letter-sounds in Grade R through a programme that focused on teaching letter-sounds in the context of building language skills, emergent writing and concepts about print. In order to strengthen the effectiveness of the intervention, the volunteer programme was supplemented by support for the Grade R teacher and teaching assistant. Follow-up assessments of one of the intervention groups at the end of Grade One revealed significant correlations between early Grade One letter knowledge and end of Grade One word reading and spelling skills. The findings of this exploratory study are in line with research that shows the importance of letter-sound knowledge in the earliest stages of learning to read. This raises concerns about the historical lack of emphasis in the Grade R curriculum on this aspect of early literacy development. Although the study has a narrow focus and conclusions cannot be drawn about other aspects of early literacy learning in this context, the results suggest an urgent need for quality Grade R teacher training programmes with a specific focus on emergent literacy.
Teaching language and literacy in Grade R: A focus on letters and sounds within a story-based programme
Creators: name: O'Carroll, Shelley
Publisher: name: Wordworks
Year: 2023
Subjects: Grade R
early literacy
letter-sound knowledge
teacher training
South Africa

description: Further information about the project as well as creative commons licensed resources can be accessed here: https://www.jet.org.za/clearinghouse/projects/grade-r-maths-and-languageimprovement-project/resources or contact the developers at info@wordworks.org.za.
description: The low early grade reading levels of South African children are well documented (Van Staden & Gustafsson, 2022). Recent PIRLS results highlight challenges with reading comprehension at Grade 4 level, but studies also show that many children are not acquiring alphabet knowledge earlier in their reading trajectory, and that these children are more likely to struggle with reading fluency and comprehension in later years (Wills, Ardington & Sebaeng, 2022). But why is learning about letters and the sounds they make proving to be such a difficult task for the majority of children in South Africa? When is the optimal time to be learning about letters and would it make a difference if alphabet knowledge had a stronger focus in Grade R? Local and international research is clear: letter–sound knowledge is critical for learning to read and write in an alphabetic language (Snow, Burns & Griffin, 1998; Castles, Rastle & Nation, 2018). What remains controversial is when and how best to support children to learn about letters and the sounds they make. Drawing on research and best practice for teaching young children, this paper highlights the key principles that underpinned the development of materials to teach letter–sound knowledge in Grade R. These materials were developed as part of a story-based Home Language programme for the Gauteng Grade R Language Improvement Project, a provincial teacher training programme targeting all Grade R teachers in public ordinary schools, special needs schools and registered ECD centres in Gauteng.
Dynamics of one-dimensional spin models under the line-graph operator
Creators: name: Javarone, Marco A.
name: O'Connor, Josh A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We investigate the application of the line-graph operator to one-dimensional spin models with periodic boundary conditions. The spins (or interactions) in the original spin structure become the interactions (or spins) in the resulting spin structure. We identify conditions which ensure that each new spin structure is stable, that is, its spin configuration minimises its internal energy. Then, making a correspondence between spin configurations and binary sequences, we propose a model of information growth and evolution based on the line-graph operator. Since this operator can generate frustrations in newly formed spin chains, in the proposed model such frustrations are immediately removed. Also, in some cases, the previously frustrated chains are allowed to recombine into new stable chains. As a result, we obtain a population of spin chains whose dynamics is studied using Monte Carlo simulations. Lastly, we discuss potential applications to areas of research such as combinatorics and theoretical biology.
description: 28 pages, 12 figures
Suppression of the large scale curvature perturbation by interacting fluids
Creators: name: Multamaki, T.
name: Sainio, J.
name: Vilja, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The large-scale dynamics of a two-fluid system with a time dependent interaction is studied analytically and numerically. We show how a rapid transition can significantly suppress the large-scale curvature perturbation and present approximative formulae for estimating the effect. By comparing to numerical results, we study the applicability of the approximation and find good agreement with exact calculations.
description: 7 pages, 4 figures. v2: Significant revisions: conclusion changed, references added, figures replaced
title: Κριτήρια πρόβλεψης της αστοχίας κατασκευών από όλκιμα υλικά σε διάφορες εντατικές καταστάσεις και εφαρμογή τους σε κώδικα πεπερασμένων στοιχείων
titleType: AlternativeTitle
title: Failure criteria for ductile materials and implementation with Finite Element Method
Creators: name: Savvas, Dimitrios N.
Publisher: name: National Technological University of Athens
Year: 2010
Subjects: Αστοχία κατασκευών
Όλκιμα υλικά
Κώδικας πεπερασμένων στοιχείων
Construction Failure
Ductile materials
Finite element programm

description: 146 σ.
description: Μεταπτυχιακή Εργασία -- Εθνικό Μετσόβιο Πολυτεχνείο. Διεπιστημονικό - Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών "Ναυτική & Θαλάσσια Τεχνολογία & Επιστήμη"
description: Αντικείμενο της εργασίας είναι η ανάπτυξη κατάλληλων κριτηρίων για την πρόβλεψη της αστοχίας των κατασκευών από όλκιμα υλικά και η εφαρμογή τους σε κώδικα πεπερασμένων στοιχείων.
description: The objective of the thesis is the development of proper criteria for the prediction of failure of ductile materials and the implementation in finite element programm.
Magnetic Structure and Properties of the S = 5/2 Triangular Antiferromagnet $α$-NaFeO$_2$
Creators: name: McQueen, T. M.
name: Huang, Q.
name: Lynn, J. W.
name: Berger, R. F.
name: Klimczuk, T.
name: Ueland, B. G.
name: Schiffer, P.
name: Cava, R. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The magnetic properties of $α$-NaFeO$_2$ are studied by neutron diffraction and magnetization measurements. An ordered phase with spins aligned along the b$_hex$ axis exists at low temperatures (T < 4 K). At intermediate temperatures (4 K < T < 11 K), the system passes through an incommensurate ordered phase before transforming into a short range ordered state at higher temperatures that persists up to at least 50 K. Although the short range ordering does not persist to room temperature according to neutron diffraction, the magnetic susceptibility does not follow Curie-Weiss behavior, even up to 320 K. This rich magnetic behavior can be understood qualitatively as a competition between different magnetic exchange interactions that are similar in magnitude. The delicate balance between these interactions makes $α$-NaFeO$_2$ a candidate for more detailed theoretical work to understand magnetic behavior in frustrated magnetic systems.
description: Submitted to Phys Rev B, 7 pages, 8 figures
Inside the Virtuous Cycle between Productivity, Profitability, Investment and Corporate Growth: An Anatomy of China Industrialization
Creators: name: Yu, Xiaodan
name: Dosi, Giovanni
name: Grazzi, Marco
name: Lei, Jiasu
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: SECS-P/01 Economia politica

description: This article explores the dynamics of market selection by investigating of the relationships linking productivity, profitability, investment and growth, based on China's manufacturing firm-level dataset over the period 1998-2007. First, we find that productivity variations, rather than relative levels, are the dominant productivity-related determinant of firm growth, and account for 15%-20% of the variance in firms' growth rates. The direct relation between profitability and firm growth is much weaker as it contributes for less than 5% to explain the different patterns of firm growth. On the other hand, the profitability-growth relationship is mediated via investment. Firm's contemporaneous and lagged profitabilities display positive and significant effect on the probability to report an investment spike, and, in turn, investment activity is related to higher firm growth.
Magnetism in Herbig Ae/Be stars and the link to the Ap/Bp stars
Creators: name: Alecian, E.
name: Catala, C.
name: Wade, G. A.
name: Bagnulo, S.
name: Boehm, T.
name: Bouret, J. -C.
name: Donati, J. -F.
name: Folsom, C.
name: Grunhut, J.
name: Landstreet, J. D.
name: Marsden, S. C.
name: Petit, P.
name: Ramirez, J.
name: Silvester, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Among the A/B stars, about 5% host large-scale organised magnetic fields. These magnetic stars show also abundance anomalies in their spectra, and are therefore called the magnetic Ap/Bp stars. Most of these stars are also slow rotators compared to the normal A and B stars. Today, one of the greatest challenges concerning the Ap/Bp stars is to understand the origin of their slow rotation and their magnetic fields. The favoured hypothesis for the latter is that the fields are fosils, which implies that the magnetic fields subsist throughout the different evolutionary phases, and in particular during the pre-main sequence phase. The existence of magnetic fields at the pre-main sequence phase is also required to explain the slow rotation of Ap/Bp stars. During the last 3 years we performed a spectropolarimetric survey of the Herbig Ae/Be stars in the field and in young clusters, in order to investigate their magnetism and rotation. These investigations have resulted in the detection and/or confirmation of magnetic fields in 8 Herbig Ae/Be stars, ranging in mass from 2 to nearly 15 solar masses. In this paper I will present the results of our survey, as well as their implications for the origin and evolution of the magnetic fields and rotation of the A and B stars.
description: To appear in the proceedings of "Ecole d'astronomie du CNRS et du PNPS : Les champs magnetiques stellaires", editors: C. Neiner and J.-P. Zahn, EAS Publications Series
Teaching language and literacy in Grade R: The value of oral storytelling.
Creators: name: O'Carroll, Shelley
Publisher: name: Wordworks
Year: 2024
Subjects: storytelling
Grade R
South Africa
early literacy
teacher development

description: Further information about the project as well as creative commons licensed resources can be accessed here: https://www.jet.org.za/clearinghouse/projects/grade-r-maths-and-languageimprovement-project/resources or contact the developers at info@wordworks.org.za.
description: The low early grade reading levels of South African children have been well documented (Van Staden & Gustafsson, 2022), and recent PIRLS results highlight challenges with reading comprehension at Grade 4 level. Recent research indicates that these reading challenges begin long before Grade 4. Many children are not acquiring alphabet knowledge early in their reading trajectory, and these children are more likely to struggle with reading fluency and comprehension in later years (Wills, Ardington & Sebaeng, 2022). In addition, we know that reading comprehension has a strong base in oral language which develops from the earliest years of a child’s life (Dickinson & Tabors, 2001; O’Carroll & Hickman, 2012; Snow, Burns & Griffin, 1998). Although young children are too young to read, “reading comprehension has an oral language complement, and oral language can be addressed at very early ages before children can read” (Spencer, Weddle, Petersen & Adams, 2017, p. 2). Drawing on research and best practice for teaching young children, this paper highlights the key principles that underpinned the development of materials to strengthen oral language teaching in Grade R. These materials were developed as part of a story-based Home Language programme for the Gauteng Grade R Language Improvement Project, a provincial teacher training programme targeting all Grade R teachers in public ordinary schools, special needs schools and registered ECD centres in Gauteng. This materials-development project provided a unique opportunity to develop an affordable, open-source, evidence-based programme for South African children and their teachers in the 11 official South African languages. The development team needed to ensure that the teaching and assessment activities for the project were curriculum aligned and covered the content in the CAPS Home Language for Grade R.
Reshaping-induced spatiotemporal chaos in driven, damped sine-Gordon systems
Creators: name: Chacon, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spatiotemporal chaos arising from the competition between sine-Gordon-breather and kink-antikink-pair solitons by reshaping an ac force is demonstrated. After introducing soliton collective coordinates, Melnikov's method is applied to the resulting effective equation of motion to estimate the parameter-space regions of the ac force where homoclinic bifurcations are induced. The analysis reveals that the chaos-order threshold exhibits sensitivity to small changes in the force shape. Computer simulations of the sine-Gordon system show good agreement with these theoretical predictions.
description: 11 pages, 3 figures
Additional file 1 of Caesarean section in pregnancies conceived by assisted reproductive technology: a systematic review and meta-analysis
Creators: name: Lodge-Tulloch, Nakeisha A.
name: Elias, Flavia T. S.
name: Pudwell, Jessica
name: Gaudet, Laura
name: Walker, Mark
name: Smith, Graeme N.
name: Velez, Maria P.
Publisher: name: figshare
Year: 2021
Subjects: Medicine
Cell Biology
Developmental Biology
Science Policy

description: Additional file 1. Search strategy using the OVID platform. A description of the search terms and results for the literature search of the MEDLINE, EMBASE, and CINHAL databases on the OVID Platform.
Inward Propagating Plasma Parcels in the Solar Corona: Models with Aerodynamic Drag, Ablation, and Snowplow Accretion
Creators: name: Cranmer, Steven R.
name: DeForest, Craig E.
name: Gibson, Sarah E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Although the solar wind flows primarily outward from the Sun to interplanetary space, there are times when small-scale plasma inflows are observed. Inward-propagating density fluctuations in polar coronal holes were detected by the COR2 coronagraph on board the STEREO-A spacecraft at heliocentric distances of 7 to 12 solar radii, and these fluctuations appear to undergo substantial deceleration as they move closer to the Sun. Models of linear magnetohydrodynamic waves have not been able to explain these deceleration patterns, so they have been interpreted more recently as jets from coronal sites of magnetic reconnection. In this paper, we develop a range of dynamical models of discrete plasma parcels with the goal of better understanding the observed deceleration trend. We found that parcels with a constant mass do not behave like the observed flows, and neither do parcels undergoing ablative mass loss. However, parcels that accrete mass in a snowplow-like fashion can become decelerated as observed. We also extrapolated OMNI in situ data down to the so-called Alfven surface and found that the initial launch-point for the observed parcels may often be above this critical radius. In other words, in order for the parcels to flow back down to the Sun, their initial speeds are probably somewhat nonlinear (i.e., supra-Alfvenic) and thus the parcels may be associated with structures such as shocks, jets, or shear instabilities.
description: Accepted for publication in the Astrophysical Journal. 16 pages, 8 figures
Supporting Information from Football is becoming more predictable; network analysis of 88 thousand matches in 11 major leagues
Creators: name: Maimone, Victor Martins
name: Yasseri, Taha
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 80201 Analysis of Algorithms and Complexity
subject: FOS: Computer and information sciences

description: Supporting Information.pdf Includes all the additional Figures and Tables.
Optimal Shape of a Blob
Creators: name: Bender, Carl M.
name: Bender, Michael A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: This paper presents the solution to the following optimization problem: What is the shape of the two-dimensional region that minimizes the average L_p distance between all pairs of points if the area of this region is held fixed? [The L_p distance between two points ${\bf x}=(x_1,x_2)$ and ${\bf y}=(y_1,y_2)$ in $\Re^2$ is $(|x_1-y_1|^p+|x_2-y_2|^p)^{1/p}$.] Variational techniques are used to show that the boundary curve of the optimal region satisfies a nonlinear integral equation. The special case p=2 is elementary and for this case the integral equation reduces to a differential equation whose solution is a circle. Two nontrivial special cases, p=1 and p=\infty, have already been examined in the literature. For these two cases the integral equation reduces to nonlinear second-order differential equations, one of which contains a quadratic nonlinearity and the other a cubic nonlinearity.
description: 10 pages, 1 figure
The origin of chirality induced spin selectivity in photo-induced electron transfer
Creators: name: Fay, Thomas P.
name: Limmer, David T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Here we propose a mechanism by which spin polarization can be generated dynamically in chiral molecular systems undergoing photo-induced electron transfer. The proposed mechanism explains how spin polarization emerges in systems where charge transport is dominated by incoherent hopping, mediated by spin orbit and electronic exchange couplings through an intermediate charge transfer state. We derive a simple expression for the spin polarization that predicts a non-monotonic temperature dependence consistent with recent experiments. We validate this theory using approximate quantum master equations and the numerically exact hierarchical equations of motion. The proposed mechanism of chirality induced spin selectivity should apply to many chiral systems, and the ideas presented here have implications for the study of spin transport at temperatures relevant to biology, and provide simple principles for the molecular control of spins in fluctuating environments.
A Research Funder's Open Access Policy
Creators: name: Farley, Ashley
Publisher: name: My University
Year: 2024
Subjects: Open Access
Open Access Policy
Research Funding
Academic Research
Scholarly Communication
Webinar
AfricArXiv
Bill and Melinda Gates Foundation

description: The Bill & Melinda Gates Foundation’s Open Access Policy The Bill & Melinda Gates Foundation is committed to information sharing and transparency. We believe that published research resulting from our funding should be promptly and broadly disseminated. We have adopted an Open Access policy that enables the unrestricted access and reuse of all peer-reviewed published research funded, in whole or in part, by the foundation, including any underlying data sets. Read about the policy here: openaccess.gatesfoundation.org/open-access-policy/ 2025 Policy Refresh Since 2015, the Bill & Melinda Gates Foundation has led a bold Open Access policy that prioritizes the access, transparency, and equity of funded research. With a decade of experience and lessons learned, the foundation is refreshing its Open Access policies to address ongoing challenges and advance systemic change in scholarly publishing. The policy refresh will take effect on January 1st, 2025. Read about the Open Access 2025 Policy here: https://openaccess.gatesfoundation.org/open-access-policy/2025-open-access-policy/
description: A Research Funder's Open Access Policy - AfricArXiv Open Science Webinar Series 2024 Watch the recording here: https://africarxiv.pubpub.org/pub/amicfn6b/