cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Weak magnetic field changes over the Pacific due to high conductance in lowermost mantle
Creators: name: Dumberry, Mathieu
name: More, Colin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: For the past few centuries, the temporal variation in the Earth's magnetic field in the Pacific region has been anomalously low. The reason for this is tied to large scale flows in the liquid outer core near the core-mantle boundary, which are weaker under the Pacific and feature a planetary scale gyre that is eccentric and broadly avoids this region. However, what regulates this type of flow morphology is unknown. Here, we present results from a numerical model of the dynamics in Earth's core that includes electromagnetic coupling with a non-uniform conducting layer at the base of the mantle. We show that when the conductance of this layer is higher under the Pacific than elsewhere, the larger electromagnetic drag force weakens the local core flows and deflects the flow of the planetary gyre away from the Pacific. The nature of the lowermost mantle conductance remains unclear, but stratified core fluid trapped within topographic undulations of the core-mantle boundary is a possible explanation.
description: 27 pages, 4 figures
Agribusiness, trade and investment trends in Africa
Creators: name: Lekgau, Sydwell
name: Matlou, Clementine Ringetani
name: Lubinga, H. Moses
name: Lekgau, Sydwell
name: Matlou, Clementine Ringetani
name: Lubinga, H. Moses
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: International Development
subject: International Relations/Trade
subject: Marketing
subject: FOS: Economics and business
subject: Political Economy
subject: Agribusiness development
subject: Trade
subject: Investment trends
subject: Africa

description: This paper answers three questions, namely: (i) Is Africa trading with its self-enough? (ii) What are the driving and restraining forces of agribusiness development in Africa? (iii) Why agribusiness development, trade and invest in Africa? A review of relevant literature coupled with panel data econometric estimation based on 12 African countries for a period of 11 years (spanning from 2005 to 2015) was used to address the stated questions. Findings suggest that African countries are trading less with each other as compared to trading with non-African countries. Intra-African trade is dominated by grains, followed by vegetables and fruits and South Africa is a key trading partner on the continent. The increasing in population dynamics, urbanization, growing middle class with differential incomes, increase in consumption patterns on basic and diversified products and food waste are some of the driving forces of agribusiness while identified restraining forces include policy uncertainties, lack of infrastructure, trade distortions and climate change. Policy implications: There is need to; enact free trade within Africa (removal of trade barriers), develop infrastructure across the continent, and ensure political stability given that these factors will lead to increased development of agribusiness sector, more investment and competitive intra-Africa trade.
Strong coupling between organic dye molecules and lattice modes of a dielectric nanoparticle array
Creators: name: Heilmann, Rebecca
name: Väkeväinen, Aaro I.
name: Martikainen, Jani-Petri
name: Törmä, Päivi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Plasmonic structures interacting with light provide electromagnetic resonances which result in a high degree of local field confinement enabling the enhancement of light-matter interaction. Plasmonic structures typically consist of metals which, however, suffer from very high ohmic losses and heating. High-index dielectrics, on the other hand, can serve as an alternative material due to their low-dissipative nature and strong scattering abilities. We study the optical properties of a system composed of all-dielectric nanoparticle arrays covered with a film of organic dye molecules (IR-792), and compare these dielectric arrays with metallic nanoparticle arrays. We tune the light-matter interaction by changing the concentration in the dye film and report the system to be in the strong coupling regime. We observe a Rabi splitting between the surface lattice resonances (SLRs) of the nanoparticle arrays and the absorption line of the dye molecules of up to 253 meV and 293 meV, for the dielectric and metallic nanoparticles, respectively. The Rabi splitting depends linearly on the square root of the dye molecule concentration , and we further assess how the Rabi splitting depends on the film thickness for a low dye molecule concentration. For thinner films of thicknesses up to 260 nm, we observe no visible Rabi splitting. However, a Rabi splitting evolves at thicknesses from 540 nm to 990 nm. We perform finite-difference time-domain simulations to analyze the near-field enhancements for the dielectric and metallic nanoparticle arrays. The electric fields are enhanced by a factor of 1200 and 400, close to the particles for gold and amorphous silicon, respectively, and the modes extend over half a micron around the particles for both materials.
description: 23 pages, 8 figues, 2 tables
title: Aqueous alteration on early Mars: New insights from the aqueous geochemistry and secondary mineralogy of meteorite ALH 84001
Creators: name: Melwani Daswani, Mohit
Publisher: name: The Open University
Year: 2015

description: In the wake of the discovery of clay minerals in Gale crater (an ancient martian crater) by NASA's Curiosity rover, and numerous remote and in situ detections of hydrous minerals on the early surfaces of Mars, the absence of clays in the oldest martian meteorite, ALH 84001, remains conspicuous. ALH 84001 is an orthopyroxenite that contains carbonate minerals which were formed on Mars - probably as a result of low temperature, near-surface aqueous alteration of the rock - but it does not contain clays. This body of work comprises a number of studies and different analytical techniques used to understand and constrain the composition of early martian fluids that lead to the alteration of the meteorite when it was emplaced near the surface of Mars ~3.9 Ga ago. Petrological and mineralogical studies; carbon, nitrogen and noble gas stepped-combustion analyses; geochemical modelling under different conditions; and aqueous alteration experiments were all carried out here for this purpose. A young martian meteorite, shergottite NW A 6234, was also investigated in the context of this work to understand whether aqueous alteration persisted in time. Compositional clues described here point to varying degrees of aqueous alteration in ALH 8400 I, and possibly even in a shock melt vein in NW A 6234. The results of the extensive geochemical modelling strongly suggest that the fluid that altered ALH 84001 was near-neutral (pH≈7), low temperature (-20°C), and that the atmospheric CO2 pressure required to produce the carbonates was under 1 bar. The fluid was probably transient, and evaporated after precipitating the ubiquitous carbonates. A suite of other secondary products are predicted to have formed neighbouring ALH 84001, a few of which have been detected on Mars (such as clays), yet others are more surprising (such as talc and zeolites, and a possible pathway to the abiotic production of methane).
Hylyphantes Simon 1884
Creators: name: Tu, Lihong
name: Li, Shuqiang
Publisher: name: Zenodo
Year: 2003
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Hylyphantes

description: Genus Hylyphantes Simon, 1884
 Hylyphantes Simon, 1884: 463.
 Type species. – Erigone nigrita Simon, 1881, by monotypy.
 Generic diagnosis. – Tm I 0.60-0.65, Tm IV present, tibial spines 2-2-1-1. Both sexes are similar in general appearance, male head without modification. Male palp tibia has three trichobothria. The male Hylyphantes can be distinguished from other erigonine genera by: 1) the turbinated embolus; 2) the plate-shaped, bifurcated (with thumb-shaped upper ramus) paracymbium; 3) protegulum membranous with numerous papillae and a tail- shaped tip. The female Hylyphantes can be identified by a pair of spiral copulatory ducts.
 Description. – See Simon (1884).
description: Published as part of Tu, Lihong & Li, Shuqiang, 2003, A Review Of The Spider Genus Hylyphantes (Araneae: Linyphiidae) From China, pp. 209-214 in Raffles Bulletin of Zoology 51 (2) on page 209, DOI: 10.5281/zenodo.4619391
Additional file 7 of HCV eradication with IFN-based therapy does not completely restore gene expression in PBMCs from HIV/HCV-coinfected patients
Creators: name: Brochado, Óscar
name: Martínez, Isidoro
name: Berenguer, Juan
name: Medrano, Luz
name: González-García, Juan
name: Jiménez-Sousa, María Ángeles
name: Carrero, Ana
name: Hontañón, Víctor
name: Navarro, Jordi
name: Guardiola, Josep M.
name: Fernández-Rodríguez, Amanda
name: Resino, Salvador
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: 110309 Infectious Diseases
subject: 60506 Virology

description: Additional file 7: Appendix S1. The GESIDA 3603b Cohort Study Group.
Constructing knowledge networks in middle school classrooms : An interdisciplinary approach
Creators: name: Hein-Larkin, Teresa
name: Irvine Belson, Sarah
name: Prejean, Andrea I.
name: Vasquez, Vivian
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 39
subject: Education

description: Description to be added
Solitary Waves in Mass-in-Mass Lattices
Creators: name: Faver, Timothy E.
name: Goodman, Roy H.
name: Wright, J. Douglas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: We consider the existence of spatially localized traveling wave solutions of the mass-in-mass lattice. Under an anti-resonance condition first discovered by Kevrekidis, Stefanov and Xu, we prove that such solutions exist in two distinguished limits, the first where the mass of the internal resonator is small and the second where the internal spring is very stiff. We then numerically simulate the solutions and these simulations indicate that the anti-resonant traveling waves are weakly unstable
title: Theory and practice: An examination of the factors influencing the development of confidence in mathematical pedagogical content knowledge (PCK) within primary trainee teachers
Creators: name: Darmody, Julie
Publisher: name: The Open University
Year: 2016

description: Pedagogical content knowledge was first introduced by Shulman (1986). This concept is in relation to the ability of teachers to transform the content knowledge they possess into a pedagogical form, adapted to suit the needs and abilities of the children. This study examined the ways in which primary trainees following two different routes into qualified teacher status developed confidence in mathematical pedagogical content knowledge. A case study approach was adopted focusing on trainees from a Primary SCITT (School-centred initial teacher training) and EBITT (Employment based initial teacher training) Partnership. This process explored key aspects of the training year and the perceived overall impact on the development of trainees' confidence levels in the pedagogical content knowledge aspect of mathematics. Lines of enquiry were identified related to research on the ways in which trainees learn. This included an examination of the impact of the practical experience of teaching; feedback from observations; observations of good practice; discussions with mentors and other professionals; centre-based training; discussions with peers, and previous experiences of mathematics. The trainees' perceptions of the impact of these aspects were gained through a mixed method approach and included: hard copy questionnaires, group interviews, observations of training sessions, and scrutiny of written lesson observation reports. Additional perspectives were also gained through the surveying of mentors working with the trainees and also an interview with the mathematics core tutor. Findings highlighted the importance of: reflective practice; the development of an understanding of progression in children's learning; centre-based training; the support structure within the school environment, and the teaching' experience within a second school setting. The relationship between theoretical and practical learning has been examined in detail and this highlighted the symbiotic relationship which exists between the two - concluding that both play an important role in advancing trainee teachers' confidence in mathematical pedagogical understanding.
Dimensions and spectral triples for fractals in R^N
Creators: name: Guido, Daniele
name: Isola, Tommaso
Publisher: name: arXiv
Year: 2004
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46Lxx; 28A80

description: Two spectral triples are introduced for a class of fractals in R^n. The definitions of noncommutative Hausdorff dimension and noncommutative tangential dimensions, as well as the corresponding Hausdorff and Hausdorff-Besicovitch functionals considered in math.OA/0202108, are studied for the mentioned fractals endowed with these spectral triples, showing in many cases their correspondence with classical objects. In particular, for any limit fractal, the Hausdorff-Besicovitch functionals do not depend on the generalized limit procedure.
description: 24 pages, 4 figures. To appear in Proceedings of the Conference "Operator Algebras and Mathematical Physics" held in Sinaia, Romania, June 2003, O. Bratteli, R. Longo H. Siedentop Eds., Theta Foundation, Bucarest
T Violation in Baryonic B Decays
Creators: name: Geng, C. Q.
name: Hsiao, Y. K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study $T$ violation in the three-body charmless baryonic decay of $\bar B^0 \ra Λ\bar p π^+$ through the $T$-odd triple product correlation in the standard model. We find that the $T$ violating asymmetry is 10%, which is accessible to the current B factories at KEK and SLAC, while the CP violating one 1.1%. We emphasize that this triple product correlation would be the first measurable direct $T$ violating effect predicted in the standard model.
description: 4 pages, 1 table, parallel talk given at International Conference on QCD and Hadronic Physics, Beijing, China, 16-20 Jun 2005
Additional file 1 of Azithromycin and the microbiota of cystic fibrosis sputum
Creators: name: Acosta, Nicole
name: Thornton, Christina S.
name: Surette, Michael G.
name: Ranjani Somayaji
name: Rossi, Laura
name: Rabin, Harvey R.
name: Parkins, Michael D.
Publisher: name: figshare
Year: 2021
Subjects: subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Pharmacology
subject: Biotechnology
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Hematology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1: Supplementary Figure 1. Species accumulation curves (SAC) determined using the specaccum function from vegan package in R using method = “random” and permutations = 500. SAC plot shows the increase in ASVs detected with the addition of each patient sample. Supplementary Figure 2. NMDS plot showing beta diversity of CF patient treated with azithromycin based on Bray-Curtis dissimilarities. Each patient is color coded and was sampled up to three time points: Pre (≤24 months pre-initiation treatment), day 0 (start day on azithromycin) and Post (≤24 months post its initiation treatment). Arrows indicate the timewise sequence of samples (i.e. Pre to day 0 to Post).
title: Molecular insights into the mating system of the marine diatom Pseudo-nitzschia multistriata using genetic and genomic approaches
Creators: name: Vitale, Laura
Publisher: name: The Open University
Year: 2016

description: Sexual reproduction is a fundamental phase in the life cycle of diatoms, linked to the production of genotypic diversity and the formation of large-sized initial cells that ensure population persistence. It occurs only within cells below a certain threshold size and, in heterothallic diatoms, only between strains of opposite mating types.

We aim at identifying genes involved in mating type determination in the marine planktonic diatom Pseudo-nitzschia multistriata. This species is recorded in coastal waters worldwide and produces the neurotoxin domoic acid. A reference genome has been generated and transcriptomes have been produced for strains of opposite mating type (MT + and MT-).

Differential expression analysis provided a list of candidate MT-biased genes validated with qPCR. Four MT-biased genes were identified, two in MT+ and two in MT-. The expression pattern of the candidate genes was followed in a 24 hours' time course experiment to verify whether they were regulated in dependence of light or cell cycle phases. Experimental evidences demonstrated their involvement during mating recognition in early stages of sexual reproduction while preliminary genetic analyses excluded that they could be the master gene responsible for mating type determination. The description of the four genes was improved through computational characterization to understand their role in the chemical communication occurring between opposite mating types. A further step towards the identification of the MT locus will include a Bulked Segregant Analysis applied to a library of 30 MT+ and 30 MT- F1 strains obtained through DNA deep sequencing.

Elucidating the molecular and genetic basis of MT determination and sexual reproduction in diatoms will contribute to a better understanding of the regulation and evolution of their life cycles and reproductive strategies. Results from this study could also provide molecular markers to trace the distribution of MT + and MT - cells in environmental samples.
On Dark Matter Annihilation in the Local Group
Creators: name: Pieri, Lidia
name: Branchini, Enzo
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Under the hypothesis of a Dark Matter composed by supersymmetric particles like neutralinos, we investigate the possibility that their annihilation in the haloes of nearby galaxies could produce detectable fluxes of $γ$-photons. Expected fluxes depend on several, poorly known quantities such as the density profiles of Dark Matter haloes, the existence and prominence of central density cusps and the presence of a population of sub-haloes. We find that, for all reasonable choices of Dark Matter halo models, the intensity of the $γ$-ray flux from some of the nearest extragalactic objects, like M31, is comparable or higher than the diffuse Galactic foreground. We show that next generation ground-based experiments could have the sensitivity to reveal such fluxes which could help us unveiling the nature of Dark Matter particles.
description: 11 pages, 10 figures. Accepted for publication in Phys. Rev. D.; added a new paragraph on the detectability of Galactic sub-halos in our Galaxy; added a discussion on their model dependence. The relation of our results with the "CDM crisis" issue has also been added
Collisional effects in the blue wing of the Balmer-alpha line
Creators: name: Allard, N. F.
name: Spiegelman, F.
name: Kielkopf, J. F.
name: Bourdreux, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In order to investigate the near wing of the Lyman-alpha line, accurate line profile calculations and molecular data are both required due to the existence of a close line satellite responsible for its asymmetrical shape. Lyman-alpha lines observed with the Cosmic Origin Spectograph (COS) on the Hubble Space Telescope ( HST) show this peculiarity in the spectra of DBA and DA white dwarf stars. A similar asymmetrical shape in the blue wing can be predicted in the Balmer-alpha line of H perturbed by He and H atoms. In continuation with a very recent work on the Lyman-alpha line, where the n=2 potential energies and transition dipole moments from the ground state were determined, we present new accurate H-He potential energies and electronic transition dipole moments involving the molecular states correlated with H(n=3)+He and their transition dipole moments with the states correlated with H(n=2)+He. Those new data and existing molecular data for H(n=2,3)-H are used to provide a theoretical investigation of the collisional effects in the blue wing of the Balmer-alpha line of H perturbed by He and H atoms. We note the consequences for the Balmer-alpha line shape in the physical conditions found in the cool atmosphere of DZA white dwarfs where helium densities may be as high as 10^21 cm-3. This study is undertaken with a unified theory of spectral line broadening valid at very high helium densities.
description: 9 pages, 12 figures
Phrases with non-finite verbs in the Albanian language as subordinate clauses (comparison of the Gegë infinitive to the subjunctive using the generative grammar approach)
Creators: name: Liko, Brikena
Publisher: name: figshare
Year: 2020
Subjects: subject: Linguistics
subject: FOS: Languages and literature

description: This is the English version of the article Sintagmat me folje të pashtjelluara në gjuhën shqipe si fjali të nënrenditura  (përqasje e paskajores gege me lidhoren sipas modelit gjenerativ), published on IJMRD (allsubjectjournal.com), Volume 4; Issue 11; November 2017; Page No. 85-90, as part of my doctoral thesis project (defended on March, 2018). In generative syntax non-finite verbs have predicative value, but in traditional Albanian grammar they have generally not been recognized with this predicative value, except in some special cases. This paper will deal with constructions with non-finite Albanian verbs from a generative point of view, to see if they project a particular phrase, which element serves as the head of this construction and other related issues. In Albanian the Gegë infinitive has been replaced by the conjunctive in most of the cases. However, if the former are non-finite verbs, the latter are finite: (inflectional phrases whose predicate value has been recognized). Is this a simple substitution, or are here other changes related to the meaning? Therefore at the end of this paper, a structural and meaningful comparison will be made between these two constructions which have been used in place of each other.-- Please feel free to give me your feedback and suggestions: brikenaliko@hotmail.com --
Lung Infection Quantification of COVID-19 in CT Images with Deep Learning
Creators: name: Shan, Fei
name: Gao, Yaozong
name: Wang, Jun
name: Shi, Weiya
name: Shi, Nannan
name: Han, Miaofei
name: Xue, Zhong
name: Shen, Dinggang
name: Shi, Yuxin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Biological sciences

description: CT imaging is crucial for diagnosis, assessment and staging COVID-19 infection. Follow-up scans every 3-5 days are often recommended for disease progression. It has been reported that bilateral and peripheral ground glass opacification (GGO) with or without consolidation are predominant CT findings in COVID-19 patients. However, due to lack of computerized quantification tools, only qualitative impression and rough description of infected areas are currently used in radiological reports. In this paper, a deep learning (DL)-based segmentation system is developed to automatically quantify infection regions of interest (ROIs) and their volumetric ratios w.r.t. the lung. The performance of the system was evaluated by comparing the automatically segmented infection regions with the manually-delineated ones on 300 chest CT scans of 300 COVID-19 patients. For fast manual delineation of training samples and possible manual intervention of automatic results, a human-in-the-loop (HITL) strategy has been adopted to assist radiologists for infection region segmentation, which dramatically reduced the total segmentation time to 4 minutes after 3 iterations of model updating. The average Dice simiarility coefficient showed 91.6% agreement between automatic and manual infaction segmentations, and the mean estimation error of percentage of infection (POI) was 0.3% for the whole lung. Finally, possible applications, including but not limited to analysis of follow-up CT scans and infection distributions in the lobes and segments correlated with clinical findings, were discussed.
description: 23 pages, 6 figures
title: Case study of middle and senior leader working relationships in a secondary school in England
Creators: name: Riazat, Nasima Shaheen
Publisher: name: The Open University
Year: 2016

description: This study aims to examine whether middle leaders in School A operate beyond their departments to participate in whole school decision-making alongside senior leaders through exploring working relationships. Much has been written about sharing leadership across all levels in schools (Arrowsmith, 2007; Bell etal, 2011; Harris, 2011; Bush, 2012) but there remains a gap in empirical research which focuses on middle and senior leader perceptions of being involved in whole school decision-making.

This study is a small 'real-time' snapshot to illuminate participant perceptions. The extent of which 'talk' of sharing whole school decision-making occurred in practice in School A was explored from a middle and senior leader perspective.

A grounded theory case study approach was used and a small sample of four middle leaders, three senior leaders, and a headteacher were interviewed from School A in the North of England. The interview data was triangulated through observations, documentary analysis of documents, such as agendas and minutes of meetings, before being analysed and compared against existing academic literature. Two important overarching theoretical concepts of 'relationships between middle and senior leaders' and 'organisational culture' emerged which underpinned the sub-concepts of 'balkanization', 'collaboration', 'capacity building', 'job role', and 'hierarchy'.

The findings show a culture of transactional leadership is operating in School A and an ethos of balkanization indicates middle leaders are working in individual departments. There is a belief amongst the middle leaders that their involvement in whole school decision-making is contrived, however, the data also indicates that middle leaders may not readily accept whole school decision-making as part of their wider role.

Research outcomes, which emerged from the data, suggest possible ways forward for School A to increase and embed collaborative decision-making between middle and senior leaders within the existing transactional school culture.
Pseudogap and Central Peak in the Emery Model
Creators: name: Sunko, D. K.
name: Barisic, S.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The effect of antiferromagnetic (AF) correlations is studied in the framework of the three-band (Emery) model, with respect to experiments in BSCCO. We study the pseudogap regime with a central peak. Detailed dispersions of quasiparticle peaks show that one can simultaneously fit Fermi surfaces and ARPES leading-edge energy scales. The band parameter regime is a strong-coupling one: marked renormalization of the copper-oxygen overlap, making it smaller than the oxygen-oxygen overlap, while the copper-oxygen energy splitting is the largest of the three. The same regime was found previously in a zeroth-order fit of Fermi surfaces. The inclusion of AF correlations in a weak-coupling approach resolves the only qualitative discrepancy of the zeroth-order mean-field slave-boson calculation with experiment: it is argued that the observed large flat region of the dispersion around the vH point is due to the very non-dispersive central peak in the X-M direction. The sudden increase of the experimental one-particle dispersion in the X-M direction is explained by the quasiparticle strength shifting to the upper wing of the magnetic pseudogap, as one moves further away from the X (van Hove) point. Near it, the lower wing is predicted to be observed in the X-M direction, in addition to the narrow central peak, giving rise to a two-peaked structure below the Fermi level, as found experimentally.
description: Contribution to M2S-HTSC in Rio, May 2003
Slowing down of spin relaxation in two dimensional systems by quantum interference effects
Creators: name: Lyubinskiy, I. S.
name: Kachorovskii, V. Yu.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The effect of weak localization on spin relaxation in a two-dimensional system with a spin-split spectrum is considered. It is shown that the spin relaxation slows down due to the interference of electron waves moving along closed paths in opposite directions. As a result, the averaged electron spin decays at large times as $1/t$. It is found that the spin dynamics can be described by a Boltzmann-type equation, in which the weak localization effects are taken into account as nonlocal-in-time corrections to the collision integral. The corrections are expressed via a spin-dependent return probability. The physical nature of the phenomenon is discussed and it is shown that the "nonbackscattering" contribution to the weak localization plays an essential role. It is also demonstrated that the magnetic field, both transversal and longitudinal, suppresses the power tail in the spin polarization.
description: 12 pages, 2 figures
Dust Devils on Titan
Creators: name: Jackson, Brian
name: Lorenz, Ralph D.
name: Barnes, Jason W.
name: Szurgot, Michelle
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Conditions on Saturn's moon Titan suggest dust devils, which are convective, dust-laden plumes, may be active. Although the exact nature of dust on Titan is unclear, previous observations confirm an active aeolian cycle, and dust devils may play an important role in Titan's aeolian cycle, possibly contributing to regional transport of dust and even production of sand grains. The Dragonfly mission to Titan will document dust devil and convective vortex activity and thereby provide a new window into these features, and our analysis shows that associated winds are likely to be modest and pose no hazard to the mission.
description: Accepted for publication in JGR: Planets; data and code available here - https://zenodo.org/record/3470280
Phenomenology of Space Time Fluctuations
Creators: name: Aloisio, R.
name: Blasi, P.
name: Galante, A.
name: Grillo, A. F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Quantum gravitational effects may induce stochastic fluctuations in the structure of space-time, to produce a characteristic foamy structure. It has been known for some time now that these fluctuations may have observable consequences for the propagation of cosmic ray particles over cosmological distances. While invoked as a possible explanation for the detection of the puzzling cosmic rays with energies in excess of the threshold for photopion production (the so-called super-GZK particles), we demonstrate here that lower energy observations may provide strong constraints on the role of a fluctuating space-time structure. We note also that the same fluctuations, if they exist, imply that some decay reactions normally forbidden by elementary conservation laws, become kinematically allowed, inducing the decay of particles that are seen to be stable in our universe. Due to the strength of the prediction, we are led to consider this finding as the most severe constraint on the classes of models that may describe the effects of gravity on the structure of space-time. We also propose and discuss several potential loopholes of our approach, that may affect our conclusions. In particular, we try to identify the situations in which despite a fluctuating energy-momentum of the particles, the reactions mentioned above may not take place.
description: 18 pages, 1 figure, talk given at the 10th Marcel Grossman Meeting (Rio de Janeiro, July 20 - 26, 2003)
Sason Simon 1887
Creators: name: Schwendinger, Peter J.
Publisher: name: Zenodo
Year: 2003
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Barychelidae
Sason

description: Sason Simon, 1887
 Diagnosis. – Small barychelid spiders, characterised by: carapace, opisthosoma and legs with pronounced colour pattern; eye tubercle very low or absent; clypeus indistinct; labium distally with transvers row of short stout (present in all females and in males of some species) and/or filiform cuspules (in males of other species); PLS with conical apical segment; paired tarsal claws with few denticles in one row or edentate (in males of some species); cymbium short, undivided; palpal claw tufts of females weak or absent.
For synonymy and detailed description, see Raven (1986: 49; 1994: 700).
description: Published as part of Schwendinger, Peter J., 2003, Two New Species Of The Arboreal Trapdoor Spider Genus Sason (Araneae: Barychelidae) From Southeast Asia, pp. 197-207 in Raffles Bulletin of Zoology 51 (2) on pages 197-198, DOI: 10.5281/zenodo.4619377
Feasibility of supplying a food conference with local foods from UBC Farm : the feasibility of re-localizing UBC's Food System
Creators: name: Bunney, Allison
name: Wallace, Brian
name: Pun, Judy
name: Liu, Man Shan
name: Dhaliwal, Rawinder
name: Johnson, Robyn
name: Elliott, Treeva
Publisher: name: The University of British Columbia
Year: 2014

description: This paper is part of a five-year study, now at the end of its fourth year, of an ongoing collaborative project entitled The Sustainability of the UBC Food System. Research for the UBC Food System project is conducted by the students of Agricultural Sciences 450: Land, Food & Community, at the University of British Columbia. The purpose of the study is to assess the sustainability of the food system at UBC and explore integrative actions to relocalize the UBC foodshed. Our group focuses on strengthing the link between two of the major UBC stakeholders: AMS Food and Beverage Department and the UBC Farm. Nancy Toogood, the AMS Food and Beverage Department manager, has utilized the UBC Food Systems Project to engage our group in the organization of a local food conference using Vancouver food distributors, including the UBC Farm. Our research team contacted four food distributors to aid in the design of our conference menus. We were able to evaluate the financial feasibility of holding the conference for the Community Food Security Coalition (CFSC) in August 2006. The production capabilities of the UBC Farm were also assessed and a potential growing contract was designed for the onion, garlic, and carrot quantities needed in our menu plans. It was determined that the number of local items on our conference menu has potential for growth. The ameoba food system sustainability model, (designed by the past partners in this UBC Food System Project), can be successfully utilized by the stakeholder parties interested in the locality of our proposed food conference. A continued dedication of the AMS Food and Beverage Department to incorporate locally produced foods, especially those grown on the UBC Farm, will ensure progress in the transition to a more sustainable UBC foodshed. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Asynchronous Tracking-by-Detection on Adaptive Time Surfaces for Event-based Object Tracking
Creators: name: Chen, Haosheng
name: Wu, Qiangqiang
name: Liang, Yanjie
name: Gao, Xinbo
name: Wang, Hanzi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Event cameras, which are asynchronous bio-inspired vision sensors, have shown great potential in a variety of situations, such as fast motion and low illumination scenes. However, most of the event-based object tracking methods are designed for scenarios with untextured objects and uncluttered backgrounds. There are few event-based object tracking methods that support bounding box-based object tracking. The main idea behind this work is to propose an asynchronous Event-based Tracking-by-Detection (ETD) method for generic bounding box-based object tracking. To achieve this goal, we present an Adaptive Time-Surface with Linear Time Decay (ATSLTD) event-to-frame conversion algorithm, which asynchronously and effectively warps the spatio-temporal information of asynchronous retinal events to a sequence of ATSLTD frames with clear object contours. We feed the sequence of ATSLTD frames to the proposed ETD method to perform accurate and efficient object tracking, which leverages the high temporal resolution property of event cameras. We compare the proposed ETD method with seven popular object tracking methods, that are based on conventional cameras or event cameras, and two variants of ETD. The experimental results show the superiority of the proposed ETD method in handling various challenging environments.
description: 9 pages, 5 figures
Characteristics of Some Verbs in Albanian Which Take Clausal Arguments
Creators: name: Liko, Brikena
Publisher: name: figshare
Year: 2020
Subjects: subject: Linguistics
subject: FOS: Languages and literature

description: In this paper, which treats a topic from the syntax of the Albanian language, it is aimed towards a discussion of the features and the argument structure of some Albanian verbs, which, in order to complete their valencies, can take as arguments complement phrases or inflectional phrases with clausal value. The purpose of this paper is to highlight the common characteristics of these verbs in Albanian, based on the corpus under consideration, and to distinguish them from other verbs that do not accept as arguments phrases with clausal value, and furthermore to consider some cases where the same verb presents different argument structures.This is the English version1 of the article "Karakteristika të disa foljeve në gjuhën shqipe që marrin argumente fjaliore", published on IJMRD (allsubjectjournal.com), Volume 4; Issue 11; November 2017; Page No. 63-67 (attached), part of my doctoral thesis project (defended on March, 2018).
-- Please feel free to give me your feedback and suggestions: brikenaliko@hotmail.com --
BFKL Pomeron at non-zero temperature and integrability of the Reggeon dynamics in multi-colour QCD
Creators: name: de Vega, H. J.
name: Lipatov, L. N.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We consider the QCD scattering amplitudes at high energies sqrt{s} and fixed momentum transfers sqrt{-t} in the leading logarithmic approximation at a non-zero temperature T in the t-channel. It is shown that the BFKL Hamiltonian has the property of holomorphic separability. The Pomeron wave function for arbitrary T is calculated using an integral of motion. In multi-colour QCD, the holomorphic Hamiltonian for n-reggeized gluons at temperature T is shown to coincide with the local Hamiltonian of an integrable Heisenberg model and can be obtained from the T=0 Hamiltonian by an unitary transformation. We discuss the wave functions and the spectrum of intercepts for the colourless reggeon states.
description: LaTex, 7 pages, no figures. Typo corrected. To appear in Phys. Lett. B
Livro de Relatórios do Curso de Campo ECMVS 2023
Creators: name: Ribeiro de Castro Solar, Ricardo
Publisher: name: Zenodo
Year: 2023

description: Este livro contém os relatórios dos projetos de pesquisa científica realizados pelos alunos, sob orientação dos coordenadores, professores e tutores, no Curso de Campo ECMVS/UFMG, edição 2023. O objetivo desses projetos foi treinar os alunos em história natural, teoria ecológica, método científico, planejamento e execução de projetos, técnicas de campo para estudar diferentes táxons, análise e interpretação de dados e comunicação científica. Portanto, mesmo que possam ser interessantes para inspirar projetos mais aprofundados no futuro, os resultados relatados aqui, assim como as interpretações deles, não são conclusivos. Logo, as informações contidas neste livro devem ser interpretadas com cautela, não devendo ser usadas diretamente para tomada de decisões sobre questões acadêmicas e ambientais, sem que antes os editores deste livro sejam consultados.
Fast Frontier-based Information-driven Autonomous Exploration with an MAV
Creators: name: Dai, Anna
name: Papatheodorou, Sotiris
name: Funk, Nils
name: Tzoumanikas, Dimos
name: Leutenegger, Stefan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Exploration and collision-free navigation through an unknown environment is a fundamental task for autonomous robots. In this paper, a novel exploration strategy for Micro Aerial Vehicles (MAVs) is presented. The goal of the exploration strategy is the reduction of map entropy regarding occupancy probabilities, which is reflected in a utility function to be maximised. We achieve fast and efficient exploration performance with tight integration between our octree-based occupancy mapping approach, frontier extraction, and motion planning-as a hybrid between frontier-based and sampling-based exploration methods. The computationally expensive frontier clustering employed in classic frontier-based exploration is avoided by exploiting the implicit grouping of frontier voxels in the underlying octree map representation. Candidate next-views are sampled from the map frontiers and are evaluated using a utility function combining map entropy and travel time, where the former is computed efficiently using sparse raycasting. These optimisations along with the targeted exploration of frontier-based methods result in a fast and computationally efficient exploration planner. The proposed method is evaluated using both simulated and real-world experiments, demonstrating clear advantages over state-of-the-art approaches.
description: Accepted in the International Conference on Robotics and Automation (ICRA) 2020, 7 pages, 8 figures, for the accompanying video see https://youtu.be/tH2VkVony38
Circum-nuclear molecular disks: role in AGN fueling and feedback
Creators: name: Combes, F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Gas inflows fueling AGN are now traceable at high-resolution with ALMA and NOEMA. Dynamical mechanisms are essential to exchange angular momentum and drive the gas to the super-massive black hole. While at 100pc scale, the gas is sometimes stalled in nuclear rings, recent observations reaching 10pc scale (50mas), inside the sphere of influence of the black hole, may bring smoking gun evidence of fueling, within a randomly oriented nuclear molecular disk. AGN feedback is also observed, in the form of narrow and collimated molecular outflows, which point towards the radio mode, or entrainment by a radio jet. Precession has been observed in a molecular outflow, indicating the precession of the radio jet. One of the best candidates for precession is the Bardeen-Petterson effect at small scale, which exerts a torque on the accreting material, and produces an extended disk warp. The misalignment between the inner and large-scale disk, enhances the coupling of the AGN feedback, since the jet sweeps a large part of the molecular disk.
description: 6 pages, 3 figures, Proceedings of IAUS 359, Storchi-Bergmann et al. ed
Positive energy representations of affine vertex algebras
Creators: name: Futorny, Vyacheslav
name: Křižka, Libor
Publisher: name: arXiv
Year: 2020
Subjects: subject: Representation Theory (math.RT)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We construct new families of positive energy representations of affine vertex algebras together with their free field realizations by using localization technique. We introduce the twisting functor T_αon the category of modules over affine Kac--Moody algebra \widehat{g}_κof level κfor any positive root αof g, and the Wakimoto functor from a certain category of g-modules to the category of smooth \widehat{g}_κ-modules. These two functors commute and the image of the Wakimoto functor consists of relaxed Wakimoto \widehat{g}_κ-modules. In particular, applying the twisting functor T_αto the relaxed Wakimoto \widehat{g}_κ-module whose top degree component is isomorphic to the Verma g-module M^g_b(λ), we obtain the relaxed Wakimoto \widehat{g}_κ-module whose top degree component is isomorphic to the α-Gelfand--Tsetlin g-module W^g_b(λ, α). We show that the relaxed Verma module and relaxed Wakimoto module whose top degree components are such α-Gelfand--Tsetlin modules, are isomorphic generically. This is an analogue of the result of E.Frenkel for Wakimoto modules both for critical and non-critical level. For a parabolic subalgebra p of g we construct a large family of admissible g-modules as images under the twisting functor of generalized Verma modules induced from p. In this way, we obtain new simple positive energy representations of simple affine vertex algebras.
description: 45 pages, 2 figures