cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Physicochemical characterisation of biochar derived from sargassum spp. and its antibacterial activity
Creators: name: Hernández-Calderón, Carlos
name: Escobar, B.
name: Valdez-Ojeda, Ruby
name: Arroyo-Herrera, Ana
name: Toledano-Thompson, Tanit
name: Baas-López, José
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified

description: This experiment aims to study the potential use of biochar derived from Sargassum spp. as an innovative ingredient in homemade soap, focusing on its antibacterial activity. The pyrolysis process was conducted at 700 °C with a heating rate of 10 °C min−1 for 2 h under a nitrogen atmosphere with KOH chemical activation. The physicochemical properties of the biochar were investigated using XRD, FTIR, Raman, BET surface analysis, and SEM. Highly porous biochar was successfully synthesised, achieving a large specific surface area of 1600 m2 g−1 and a well-developed microporous structure distributed across the surface of the biochar. Klebsiella pneumoniae, Staphylococcus aureus, and Salmonella choleraesuis were used as model pathogens to evaluate the antibacterial activity of biochar-enriched homemade soap using Müeller-Hinton Agar and the Kirby-Bauer test. The antibacterial evaluations demonstrated that the incorporation of biochar into homemade soap partially inhibited the growth of these model pathogens bacteria.
Jackiw-Teitelboim quantum gravity with defects and the Aharonov-Bohm effect
Creators: name: Mefford, Eric
name: Suzuki, Kenta
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the theory of Jackiw-Teitelboim gravity with generalized dilaton potential on Euclidean two-dimensional negatively curved backgrounds. The effect of the generalized dilaton potential is to induce a conical defect on the two-dimensional manifold. We show that this theory can be written as the ordinary quantum mechanics of a charged particle on a hyperbolic disk in the presence of a constant background magnetic field plus a pure gauge Aharonov-Bohm field. This picture allows us to exactly calculate the wavefunctions and propagators of the corresponding gravitational dynamics. With this method we are able to reproduce the gravitational density of states as well as compute the Réyni and entanglement entropies for the Hartle-Hawking state. While we reproduce the classical entropy at high temperature, we also find an extra topological contribution that becomes dominant at low temperatures. We then show how the presence of defects modify correlation functions, including the out-of-time-ordered correlation, and decrease the Lyapunov exponent. This is achieved two ways: by directly quantizing the boundary Schwarzian theory and by dimensionally reducing $SL(2,\mathbb{Z})$ black holes.
description: 64 pages, 2 figures
Hearing through your eyes:  Modulation of visually-evoked auditory response by transcranial alternating current stimulation
Creators: name: Fassnidge, Christopher
name: Knudsen, Synøve
name: Freeman, Elliot
Publisher: name: F1000Research
Year: 2015

description: Evidence is emerging that some people can 'hear' visual events as sounds (Saenz & Koch, Curr Biol, 2006). Here we investigated the neurophysiological basis of this visually-evoked auditory response (vEAR).

Twenty-three participants, including Royal Academy musicians and self-identified synaesthetes (e.g. grapheme-colour or music-colour), received 10Hz Transcranial Alternating Current stimulation (or sham stimulation) over bilateral Occipital versus Temporal scalp sites, while judging whether pairs of Visual or Auditory ‘Morse code’ sequences were same or different. They were then asked whether they had heard faint sounds accompanying the flashes. 46% answered 'yes', of whom 74% were both synaesthetes and musicians.

For the non-vEAR participants (54%), Occipital stimulation impaired Visual sequence discrimination, but also benefited Auditory, relative to sham. Temporal stimulation had the opposite effect, impairing Auditory but improving Visual performance. In contrast, the vEAR group showed no effects of stimulation on average [p<.05].

Our results suggest that in non-vEAR people, vision and audition inhibit each other (Mattingley et al, Neuropsych, 1997; Iurilli et al, Neuron, 2012), at least when performing a unimodal task. Stimulation at alpha frequency might interrupt the inhibitory signals mediating this competition (e.g. Klimesch et al, Br Res Rev, 2007), biasing competition in favour of the unstimulated cortex. In contrast, TACS may be ineffective for vEAR people who recode flashes as sounds, because their visual and auditory cortices actually cooperate rather than compete. This interpretation supports the ‘unmasking’ theory that some kinds of synaesthesia are characterised by reduced inhibition of corollary cross-modal activations (Grossenbacher & Lovelace, TICS, 2001; Cohen Kadosh & Walsh, V, Curr Biol, 2006).
title: Strategie intuicyjne w projektowaniu architektonicznym w przestrzeniach o silnym istniejącym kontekście
Creators: name: Rumież, Agnieszka
Publisher: name: Publishing House of Poznan University of Technology
Year: 2021

description: Zeszyty Naukowe Politechniki Poznańskiej. Architektura, Urbanistyka, Architektura wnętrz, 5, 41-52
Macrogynoplax quadrispina Menezes & Boldrini & Novaes 2020, n. sp.
Creators: name: Menezes, Emely Trajano De
name: Boldrini, Rafael
name: Novaes, Marcos Carneiro
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Macrogynoplax
Macrogynoplax quadrispina

description: Macrogynoplax quadrispina n. sp.
(Figs. 2 A–E)
 Material examined. Holotype male: BRAZIL (BRA), Roraima State (RR), Municipality of Amajari, Serra do Tepequém, Igarapé Cocal, 03°45’12.00”N / 61°42’42.00”W, 03–13.xi.2017, Malaise trap, R. Boldrini (INPA). Paratypes: same locality, 03–13.xi.2017, Malaise trap, 1 male; 13–23.xi.2017, Malaise trap, 1 female, R. Boldrini (UFRR).
 Description. General color pale yellow in ethanol. Head with M-line not distinct; gena light brown; maxillary and labial palps light brown; antennae dark yellow, with scape and pedicel light yellow; compound eyes dark and with inner margin not pigmented; ocelli with narrow dark ring (Fig. 2A). Coxa and trochanter pale yellow, first and third pair of legs with entirely brown tibia and femur. Wings yellow with veins darker except veins Sc. Cerci dark yellow.
 Male. Forewing length 9.8–10.2 mm (n= 2). Ninth sternite with a pair of basolateral protuberances; hammer U-shape (Fig. 2E). Penial amature with ventromedial membranous bowl-shaped section, with of four hooks, one pair lateroapically smaller and tapered, other pair posteriorly laterally longer and thicker with spines at the apex; the apex of the hooks are darkly sclerotized (Figs. 2 B-D).
 Female. Forewing length 12.6–13.0 mm (n= 1). Head larger than the male, coloration similar to male. Subgenital plate notched, not reaching beyond the posterior margin of the sternum 9. The lateral bars are fused to the sternum 9.
 Nymph. Unknown.
 Remarks. Specimens have faded in ethanol. The presence of four penial hook-like structures is unusual and unique among the known species of Macrogynoplax, easily distinguishing the male of the new species from all other described species.
 Etymology. From word combination of the Latin quadr and spin, for the four hooks of the penial amature.
description: Published as part of Menezes, Emely Trajano De, Boldrini, Rafael & Novaes, Marcos Carneiro, 2020, New species of the genus Macrogynoplax and new records of Anacroneuria (Plecoptera: Perlidae) from Roraima State, Brazil, pp. 463-471 in Zootaxa 4722 (5) on page 465, DOI: 10.11646/zootaxa.4722.5.4, http://zenodo.org/record/3609700
Lie superalgebras and irreducibility of A_1^(1)-modules at the critical level
Creators: name: Adamovic, Drazen
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B67; 17B69; 81R10

description: We introduce the infinite-dimensional Lie superalgebra ${\mathcal A}$ and construct a family of mappings from certain category of ${\mathcal A}$-modules to the category of A_1^(1)-modules of critical level. Using this approach, we prove the irreducibility of a family of A_1^(1)-modules at the critical level. As a consequence, we present a new proof of irreducibility of certain Wakimoto modules. We also give a natural realizations of irreducible quotients of relaxed Verma modules and calculate characters of these representations.
description: 21 pages, Latex
Qualities of axion and LSP in Pati-Salam unification with $Z^R_{4}\times Z_{N}$ symmetry
Creators: name: Kawamura, Junichiro
name: Raby, Stuart
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we construct supersymmetric Pati-Salam (PS) models containing the minimal supersymmetric standard model and an invisible axion. The models include two discrete symmetries, $\mathbb{Z}_4^R \times \mathbb{Z}_N$, which maintain the $quality$ of the accidental Peccei-Quinn (PQ) symmetry and thus the solution to the strong CP problem. We require that the discrete anomaly conditions are satisfied for both $\mathbb{Z}_4^R \times G_{\rm PS}^2$ and $ \mathbb{Z}_N \times G_{\rm PS}^2$. The vacuum expectation value of the PQ field spontaneously breaks all the discrete symmetries. R-parity is violated if any of the PQ field(s) has an odd charge under $\mathbb{Z}_4^R$. We present two explicit models which we refer to as a minimal model where R-parity violation is extremely suppressed, and a non-minimal model where R-parity violation is significant. In the latter model, the neutralino becomes unstable even if it is the Lightest Supersymmetric Particle (LSP), and, in addition, there are new low-energy vector-like states. In both examples, R-parity violation is sufficiently suppressed such that the proton is stable.
description: 32 pages, 9 tables
Temporal Evolution Of Thermal Emission From Relativistically Expanding Plasma
Creators: name: Pe'er, Asaf
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Propagation of photons in relativistically expanding plasma outflows, characterized by steady Lorentz factor Gamma is considered. Photons that are injected in regions of high optical depth are advected with the flow until they escape at the photosphere. Below the photosphere, the photons are coupled to the plasma via Compton scattering. I show here, that as a result of the slight misalignment of the scattering electrons velocity vectors, the (local) comoving photon energy decreases with radius as epsilon'(r) ~ r^{-2/3}. This mechanism dominates the photon cooling in scenarios of faster adiabatic cooling of the electrons. I then show that the photospheric radius of a relativistically expanding plasma wind strongly depends on the angle to the line of sight, theta. For theta ~ 1/Gamma, r_{ph} ~ theta^2. I show that the theta dependence of the photosphere implies that for flow parameters characterizing GRBs, thermal photons originating from below the photosphere can be observed up to tens of seconds following the inner engine activity decay. I calculate the probability density function P(r,theta) of a thermal photon to escape the plasma at radius r and angle theta. Using this function, I show that following the termination of the internal photon injection mechanism, the thermal flux decreases as F_{BB}^{ob.} ~ t^{-2}, and that the decay of the photon energy with radius results in a power law decay of the observed temperature, T^{ob.}(t) ~ t^{-2/3} at early times, which changes to t^{-1/2} later. Detailed numerical results are in very good agreement with the analytical predictions. I discuss the consequences of this temporal behavior in view of the recent evidence for a thermal emission component observed during the prompt emission phase of GRBs.
description: Typo corrected; Accepted for publication in ApJ
Quantitative Analysis of the Publishing Landscape in High-Energy Physics
Creators: name: Mele, Salvatore
name: Dallman, David
name: Vigen, Jens
name: Yeomans, Joanne
Publisher: name: arXiv
Year: 2006
Subjects: subject: Digital Libraries (cs.DL)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: World-wide collaboration in high-energy physics (HEP) is a tradition which dates back several decades, with scientific publications mostly coauthored by scientists from different countries. This coauthorship phenomenon makes it difficult to identify precisely the ``share'' of each country in HEP scientific production. One year's worth of HEP scientific articles published in peer-reviewed journals is analysed and their authors are uniquely assigned to countries. This method allows the first correct estimation on a ``pro rata'' basis of the share of HEP scientific publishing among several countries and institutions. The results provide an interesting insight into the geographical collaborative patterns of the HEP community. The HEP publishing landscape is further analysed to provide information on the journals favoured by the HEP community and on the geographical variation of their author bases. These results provide quantitative input to the ongoing debate on the possible transition of HEP publishing to an Open Access model.
description: For a better on-screen viewing experience this paper can also be obtained at: http://doc.cern.ch/archive/electronic/cern/preprints/open/open-2006-065.pdf
title: Έρευνα: MR και η επιρροή του στην εμβύθιση και το βίωμα στον πραγματικό χώρο
title: Research: MR and its influence on immersion and experience in real space
Creators: name: Κωνσταντινιδης Αιας-Περικλης
name: Ζαμκοτσιαν Μαριο
Publisher: name: Technical University of Crete
Year: 2024

description: Η Μικτή Πραγματικότητα (Mixed Reality - MR) είναι μια από τις επικρατέστερες σύγχρονες τεχνολογίες ψηφιακής απόδοσης αντικειμένων και χωρικής εμπλούτισης που έχει έρθει να αντικαταστήσει την Επαυξημένη Πραγματικότητα (Augmented Reality - AR) και συνεχώς εξελίσσεται τόσο στην αληθοφάνεια των προβολών της όσο και στα πεδία εφαρμογής που βρίσκονται σε κλάδους της καθημερινής ζωής λόγω της τεχνολογικής εξέλιξης.
Μέσω της παρούσας ερευνητικής εργασίας επιχειρείται η κατανόηση των εννοιών της εμβύθισης (Immersion) και των Εκτεταμένων Πραγματικοτήτων (Extended Realities - XR), με ιδιαίτερη προσοχή στην Μικτή Πραγματικότητα (MR), το ιστορικό τους υπόβαθρο και τις πρακτικές εφαρμογές που βρίσκουν την αρχιτεκτονική και το παιχνίδι, αλλά και την εξέλιξή τους στο βάθος του χρόνου. Επίσης, μέσα από την εργασία αυτή, εκπονείται ποιοτική έρευνα σε μορφή ερωτηματολογίου για την κατανόηση της εμπειρίας και της άποψης που υπάρχει από τις δίαφορες ορισμένες ομάδες των ερωτηθέντων και επιδιώκεται να προσδιοριστούν οι παράγοντες που ενισχύουν ή παρεμποδίζουν την ευρεία χρήση της Μικτής Πραγματικότητας (MR), καθώς και να αναδειχθούν οι τομείς στους οποίους η τεχνολογία αυτή μπορεί να βρει εφαρμογή σε καθημερινες πρακτικες.

description: Mixed Reality (MR) is one of the most prominent modern technologies for digital rendering of objects and spatial enhancement, which has come to replace Augmented Reality (AR) and is continuously evolving, both in the realism of its projections and in its fields of application, which are found in various aspects of everyday life due to technological advancements.
Through this research paper, an attempt is made to understand the concepts of Immersion and Extended Realities (XR), with a particular focus on Mixed Reality (MR), their historical background, and their practical applications in architecture and gaming, as well as their evolution over time. Additionally, this paper conducts qualitative research in the form of a questionnaire to understand the experience and opinions of various respondent groups, aiming to identify the factors that either promote or hinder the widespread use of Mixed Reality (MR) and to highlight the sectors in which this technology can be applied in everyday practices.
Stationary Points of Scalar Fields Coupled to Gravity
Creators: name: Kroger, H.
name: Melkonyan, G.
name: Paradis, F.
name: Rubin, S. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the dynamics of gravity coupled to a scalar field using a non-canonical form of the kinetic term. It is shown that its singular point represents an attractor for classical solutions and the stationary value of the field may occur distant from the minimum of the potential. In this paper properties of universes with such stationary states are considered. We reveal that such state can be responsible for modern dark energy density.
description: H. Kroger, invited talk, FFP6, Udine (2004), revised version with corrected author list
Vehicular Ad-hoc Networks: Architecture, Applications and Challenges
Creators: name: Yeferny, Taoufik
name: Hamad, Sofian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: With the emergence of Information and Communication Technologies (ICT) and wireless embedded sensing devices into modern vehicles, Intelligent Transport System (ITS) becomes a reality and an indispensable component of smart cities. The purpose of ITS is to improve road safety and traffic efficiency as well as offering infotainments services. In fact, warning drivers in the right time about dangerous situations on the road and providing them with prior information about traffic will undoubtedly leads to enhance driver's safety and reduce traffic congestion. Technically speaking, ITS is based on self-organizing wireless networks, known as vehicular ad-hoc networks (VANETs). Mobile vehicles in VANET might play the role of stationary sensors in infrastructure-based networks. They can detect, gather and disseminate real-time data about traffic, driving conditions and potential hazards on roads. In this respect, we review in this study, recent developments on the design of VANET protocols and applications. We first introduce the architecture of VANETs then we review their unique characteristics and applications. Thereafter, we discuss the main research challenges and open issues to be considered for designing efficient and a cost-effective VANET protocols and applications.
An unbiased deep search for small-area molecular structures
Creators: name: Heithausen, Andreas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Small-area molecular structures (SAMS) resembling those clumpuscules, proposed by Pfenniger and Combes (1994) as candidate for baryonic dark matter, have recently been detected (Heithausen 2002, 2004) in an area where the shielding is too low for them to survive for a long time. To study the frequency of occurence of such structures I present the results of an unbiased deep search for molecular clumpuscules. The area surrounding these structures has been surveyed using the FCRAO 14m telescope in the CO J=1-0 transition. The field covered is 20' by 20'. The resulting rms of the data is only 0.04K in a 0.127 km/s wide channel. Also, high-angular resolution observations of the 13CO and C18O (J=1-0) transitions were obtained with the IRAM Plateau-de-Bure Interferometer. 3 new SAMS have been detected. The structures have very low intensities which makes it impossible to detect them in large scale CO surveys conducted to map the molecular gas of the Milky way. They move with a similar radial velocity as the surrounding HI gas. The clouds follow the same size-linewidth relation as found for giant molecular clouds or Galactic cirrus clouds. The observations clearly show that most of the large linewidths observed at low angular resolution is caused by a large velocity difference among the clumps seen at highest angular resolution. At an adopted distance of 100pc the structures have masses of only Jupiter mass or below. My observations show that SAMS might be an abundant phenomenon in the interstellar medium however not recognized as such due to their small size. If they are made of ordinary interstellar matter with solar metallicity they likely contribute only little to the total interstellar mass.
description: 5 pages, 3 figures, accepted by Astronomy & Astrophysics
A Large Population of Luminous Active Galactic Nuclei Lacking X-ray Detections: Evidence for Heavy Obscuration?
Creators: name: Carroll, Christopher M.
name: Hickox, Ryan C.
name: Masini, Alberto
name: Lanz, Lauranne
name: Assef, Roberto J.
name: Stern, Daniel
name: Chen, Chien-Ting J.
name: Ananna, Tonima T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a large sample of infrared-luminous candidate active galactic nuclei (AGNs) that lack X-ray detections in Chandra, XMM-Newton, and NuSTAR fields. We selected all optically detected SDSS sources with redshift measurements, combined additional broadband photometry from WISE, UKIDSS, 2MASS, and GALEX, and modeled the spectral energy distributions (SEDs) of our sample sources. We parameterize nuclear obscuration in our SEDs with $E(B\!-\!V)_{\text{AGN}}$ and uncover thousands of powerful obscured AGNs that lack X-ray counterparts, many of which are identified as AGN candidates based on straightforward WISE photometric criteria. Using the observed luminosity correlation between restframe 2-10 keV ($L_{\text{X}}$) and restframe AGN 6 $μ{\text{m}}$ ($L_{\text{MIR}}$), we estimate the intrinsic X-ray luminosities of our sample sources and combine these data with flux limits from X-ray catalogs to determine lower limits on nuclear obscuration. Using the ratio of intrinsic-to-observed X-ray luminosity ($R_{L_{\text{X}}}$), we find a significant fraction of sources with column densities approaching $N_{\text{H}}>$ 10$^{\text{24}}$ cm$^{-{\text{2}}}$, suggesting that multiwavelength observations are necessary to account for the population of heavily obscured AGNs. We simulate the underlying $N_{\text{H}}$ distribution for the X-ray non-detected sources in our sample through survival analysis, and confirm the presence of AGN activity via X-ray stacking. Our results point to a considerable population of extremely obscured AGNs undetected by current X-ray observatories.
description: 15 pages, 6 tables, 10 figures. Accepted to ApJ. For the associated catalogs (tables 3 and 4), see http://dartgo.org/ccarroll_xagn_cat
The characterization of the Plasmodial GTP- CycloHydrolase I enzyme as a potential antimalarial drug target
Creators: name: Afrah Khairallah
name: Vuyani Moses
name: Ozlem  Tastan Bishop
Publisher: name: F1000 Research Limited
Year: 2019

description: This study involves the characterization of the malaria parasite GTP cyclohydrolase (GCH1) enzyme as an alternative antimalarial drug target. Sequence and phylogenetic analysis were performed, followed by homology modeling of accurate 3D structures. Virtual High Throughput Screening (VHS) of candidate inhibitory compounds from the South African Natural Compounds Database (SANCDB) was performed. Consequently, potential inhibitor compounds were identified. All-atom molecular dynamics (MD) simulations were carried out, to study GCH1 dynamical properties. Accurate force field (FF) parameters of the active site zinc ion were developed and then validated via the Chemistry at HARvard Molecular Mechanics (CHARMM) MD package.
title: Dobra kultury współczesnej – najmłodsze zabytki
Creators: name: Zierke, Piotr
Publisher: name: Publishing House of Poznan University of Technology
Year: 2021

description: Zeszyty Naukowe Politechniki Poznańskiej. Architektura, Urbanistyka, Architektura wnętrz, 5, 53-59
Fanning the teacher fire : an exploration of factors that contribute to teacher success in First Nations communities
Creators: name: Villeneuve, Jeanette
Publisher: name: University of British Columbia
Year: 2009

description: This study explores the conditions that contribute to teacher success in First Nations communities by focusing on the experiences of educators and community members from the Ermineskin Reserve, which is located in central Alberta. The study addresses the question: what factors do educators and community members identify as being major contributors to the success of teachers in First Nations communities? The study is based on a review and analysis of data obtained through semi-structured interviews conducted with twelve teachers, six administrators, six Native students and six parents of Native children. These educators and community members share their experiences and ideas about how teacher success can be optimized in First Nations settings. The study identifies a number of interrelated factors that positively and negatively influence the work of teachers in First Nations communities. Educators and community members emphasize the importance of educators and community members working together to create a school system that not only meets the needs of students but also nurtures and validates educators, parents and the larger First Nations community. Recommendations are provided for educators, Native communities, Native school boards, and post-secondary institutions who are interested in developing, nurturing and supporting teacher success in First Nations settings.
Classical many-body chaos with and without quasiparticles
Creators: name: Bilitewski, Thomas
name: Bhattacharjee, Subhro
name: Moessner, Roderich
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study correlations, transport and chaos in a Heisenberg magnet as a classical model many-body system. By varying temperature and dimensionality, we can tune between settings with and without symmetry breaking and accompanying collective modes or quasiparticles. We analyse both conventional and out-of-time-ordered spin correlators (`decorrelators') to track the spreading of a spatiotemporally localised perturbation -- the wingbeat of the butterfly -- as well as transport coefficients and Lyapunov exponents. We identify a number of qualitatively different regimes. Trivially, at $T=0$, there is no dynamics at all. In the limit of low temperature, $T=0^+$, integrability emerges, with infinitely long-lived magnons; here the wavepacket created by the perturbation propagates ballistically, yielding a lightcone at the spin wave velocity which thus subsumes the butterfly velocity; inside the lightcone, a pattern characteristic of the free spin wave spectrum is visible at short times. On top of this, residual interactionslead to spin wave lifetimes which, while divergent in this limit, remain finite at any nonzero $T$. At the longest times, this leads to a `standard' chaotic regime; for this regime, we show that the Lyapunov exponent is simply proportional to the inverse spin-wave lifetime. Visibly strikingly, between this and the `short-time' integrable regimes, a scarred regime emerges: here, the decorrelator is spatiotemporally highly non-uniform, being dominated by rare and random scattering events seeding secondary lightcones. As the spin correlation length decreases with increasing $T$, the distinction between these regimes disappears and at high temperature the previously studied chaotic paramagnetic regime emerges. For this, we elucidate how, somewhat counterintuitively, the ballistic butterfly velocity arises from a diffusive spin dynamics.
Coherent effects in crystal collimation
Creators: name: Biryukov, V. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: We present theory for coherent effects observed in crystal collimation experiments that is in good quantitative agreement with RHIC and Tevatron data. We show that coherent scattering in a bent crystal strongly amplifies beam diffusion, with an effective radiation length shortened by orders of magnitude compared to amorphous material. This coherent scattering could replace the traditional amorphous scattering in accelerator collimation systems. We predict that crystal collimation for negative particles can be as strong as for positives, unlike with channeling effect. This opens a principle way for efficient crystal steering of negative particles at accelerators. It can be demonstrated with antiproton crystal collimation at the Tevatron. We predict strong effects for the upcoming Tevatron experiment, for protons and antiprotons.
description: 11 pages, 6 figures
title: Architektura i miasto w polskim filmie fabularnym lat 60., 70. i 80. XX wieku. Etap V. Raport z badań za rok 2019
Creators: name: Nadolny, Adam
Publisher: name: Publishing House of Poznan University of Technology
Year: 2021

description: Zeszyty Naukowe Politechniki Poznańskiej. Architektura, Urbanistyka, Architektura wnętrz, 5, 61-69
A 6-12 GHz Analogue Lag-Correlator for Radio Interferometry
Creators: name: Holler, Christian M.
name: Kaneko, Tak
name: Jones, Michael E.
name: Grainge, Keith
name: Scott, Paul
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims: We describe a 6-12 GHz analogue correlator that has been developed for use in radio interferometers. Methods: We use a lag-correlator technique to synthesis eight complex spectral channels. Two schemes were considered for sampling the cross-correlation function, using either real or complex correlations, and we developed prototypes for both of them. We opted for the ``add and square'' detection scheme using Schottky diodes over the more commonly used active multipliers because the stability of the device is less critical. Results: We encountered an unexpected problem, in that there were errors in the lag spacings of up to ten percent of the unit spacing. To overcome this, we developed a calibration method using astronomical sources which corrects the effects of the non-uniform sampling as well as gain error and dispersion in the correlator.
description: 14 pages, 21 figures, accepted for publication in A&A
Hearing through your eyes: the Visually-Evoked Auditory Response
Creators: name: Fassnidge, Christopher
name: Cecconi-Marcotti, Claudia
name: Freeman, Elliot
Publisher: name: F1000Research
Year: 2015

description: In some people, visual stimulation evokes auditory sensations. How prevalent is this, and can it affect performance of visual and auditory tasks?

We measured auditory versus visual ‘Morse code’ sequence matching in 40 randomly-sampled adults. When asked whether they had heard faint sounds accompanying the flash stimuli, 16% responded 'Yes'. These same participants performed significantly better than ‘No’ respondents on visual sequence matching, as if their concurrent auditory sensations benefited visual performance (Saenz & Koch, 2008). But in a separate test, we found that any such benefit for visual sequencing was balanced by a cost for detecting faint auditory signals in the context of irrelevant visual stimulation, regardless of reported awareness. Thus even when subliminal, visually-evoked auditory sensations may affect detection of real sounds.

The high prevalence of subjective reports of ‘hearing’ visual flashes greatly exceeds the estimated prevalence of other typical synaesthesias (e.g. 2-4%; Simner et al, 2006). Our objective results suggest that subliminal visually-evoked auditory sensations may affect an even larger population. Such prevalence might be explained by the greater natural correlation between visual and auditory stimuli, compared to other more arbitrary associations typical of synaesthesia.
Black Hole Mass Measurements of Radio Galaxies NGC 315 and NGC 4261 Using ALMA CO Observations
Creators: name: Boizelle, Benjamin D.
name: Walsh, Jonelle L.
name: Barth, Aaron J.
name: Buote, David A.
name: Baker, Andrew J.
name: Darling, Jeremy
name: Ho, Luis C.
name: Cohn, Jonathan
name: Kabasares, Kyle M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 5 and Cycle 6 observations of CO(2$-$1) and CO(3$-$2) emission at 0.2''$-$0.3'' resolution in two radio-bright, brightest group/cluster early-type galaxies, NGC 315 and NGC 4261. The data resolve CO emission that extends within their black hole (BH) spheres of influence ($r_\mathrm{g}$), tracing regular Keplerian rotation down to just tens of parsecs from the BHs. The projected molecular gas speeds in the highly inclined ($i>60^\circ$) disks rises at least 500 km s$^{-1}$ near their galaxy centers. We fit dynamical models of thin-disk rotation directly to the ALMA data cubes, and account for the extended stellar mass distributions by constructing galaxy surface brightness profiles corrected for a range of plausible dust extinction values. The best-fit models yield $(M_\mathrm{BH}/10^9\,M_\odot)=2.08\pm0.01(\mathrm{stat})^{+0.32}_{-0.14}(\mathrm{sys})$ for NGC 315 and $(M_\mathrm{BH}/10^9\,M_\odot)=1.67\pm0.10(\mathrm{stat})^{+0.39}_{-0.24}(\mathrm{sys})$ for NGC 4261, the latter of which is larger than previous estimates by a factor of $\sim$3. The BH masses are broadly consistent with the relations between BH masses and host galaxy properties. These are among the first ALMA observations to map dynamically cold gas kinematics well within the BH-dominated regions of radio galaxies, resolving the respective $r_\mathrm{g}$ by factors of $\sim$5$-$10. The observations demonstrate ALMA's ability to precisely measure BH masses in active galaxies, which will enable more confident probes of accretion physics for the most massive galaxies.
description: 24 pages, 11 figures, 4 tables. Accepted for publication in ApJ
Can Nav1.7 be targeted for controlling pain after burn injury?
Creators: name: Pérez, Jose Vicente Torres
name: Istvan Nagy
name: Bantel, Carsten
Publisher: name: F1000Research
Year: 2015

description: Background and aims: controlling pain in burn injury patients is still a major clinical challenge and an unmet medical need. Nav1.7 has been suggested as a potential therapeutic target for pain management in various conditions. Our aim was to find out whether Nav1.7 is feasible target for control pain in burn injury.

Methods: experiments were performed in accordance with the requirements of the Animals (Scientific Procedures) Act 1986 (UK) Amendment Regulations 2012 (SI 2012/3039) and adhered to the guidelines of the Committee for Research and Ethical Issues of IASP published in Pain, 16 (1983) 109- 110. One of the hind paws of urethane-anaesthetised Sprague-Dawley adult male rats was immersed into 60oC water for 2 minutes to induce a partial thickness second degree scalding type burn injury. Voltage clamp recordings and immunostaining with an anti-Nav1.7 in primary sensory neurons were used to assess changes in the activity and expression of Nav1.7. pERK1/2 expression was assessed to find out the effect of blocking Nav1.7 on spinal nociceptive processing.

Results: burn injury increased Nav1.7 expression and activity in primary sensory neurons. The number of pERK1/2 positive neurons peaked at 5 minutes post-injury stabilised at a reduced level at later time points (up to 3 hours). Blocking Nav1.7 significantly reduces spinal pERK1/2 expression.

Conclusion: Nav1.7 appears to be a feasible target to reduce pain in burn injury.
Andromeda XVII: A New Low Luminosity Satellite of M31
Creators: name: Irwin, Mike
name: Ferguson, Annette
name: Huxor, Avon
name: Tanvir, Nial
name: Ibata, Rodrigo
name: Lewis, Geraint
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a new dwarf spheroidal galaxy near M31 based on INT/WFC imaging. The system, Andromeda XVII (And XVII), is located at a projected radius of ~44 kpc from M31 and has a line-of-sight distance of 794+/-40 kpc measured using the tip of the red giant branch, and therefore lies well within the halo of M31. The colour of the red giant branch implies a metallicity of [Fe/H]~-1.9 and we find an absolute magnitude of M_v~ -8.5. Three globular clusters lie near the main body of And XVII, suggesting a possible association; if any of these are confirmed, it would make And XVII exceptionally unusual amongst the faint dSph population. The projected position on the sky of And XVII strengthens an intriguing alignment apparent in the satellite system of M31, although with a caveat about biases stemming from the current area surveyed to significant depth.
description: 5 pages, ApJL acccepted
On the non-cancellation of infrared singularities in collisions of massive quarks
Creators: name: Caola, Fabrizio
name: Melnikov, Kirill
name: Napoletano, Davide
name: Tancredi, Lorenzo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the infrared structure of processes with massive quarks in the initial state. It is well known that, starting from next-to-next-to-leading order in perturbative QCD, such processes exhibit a violation of the Bloch-Nordsieck theorem, in that the sum of real and virtual contributions to partonic cross sections contains uncanceled infrared singularities. The main purpose of this paper is to present a simple physical argument that elucidates the origin of these singularities and simplifies the derivation of infrared-singular contributions to heavy-quark initiated cross sections.
description: 16 pages, 1 figure
Strongly pulsed thermal X-rays from a single extended hot spot on PSR J2021+4026
Creators: name: Rigoselli, Michela
name: Mereghetti, Sandro
name: Taverna, Roberto
name: Turolla, Roberto
name: De Grandis, Davide
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The radio-quiet pulsar PSR J2021+4026 is mostly known because it is the only rotation-powered pulsar that shows variability in its γ-ray emission. Using XMM-Newton archival data, we first confirmed that its flux is steady in the X-ray band, and then we showed that both the spectral and timing X-ray properties, i.e. the narrow pulse profile, the high pulsed fraction of 80-90% and its dependence on the energy, can be better reproduced using a magnetized atmosphere model instead of a simply blackbody. With a maximum likelihood analysis in the energy-phase space, we inferred that the pulsar has, in correspondence of one magnetic pole, a hot spot of temperature T~1 MK and colatitude extension θ~20°. For the pulsar distance of 1.5 kpc, this corresponds to a cap of R~5-6 km, greater than the standard dimension of the dipolar polar caps. The large pulsed fraction further argues against emission from the entire star surface, as it would be expected in the case of secular cooling. An unpulsed (<40% pulsed fraction), non-thermal component, probably originating in a wind nebula, is also detected. The pulsar geometry derived with our spectral fits in the X-ray is relatively well constrained (χ=90° and ξ=20-25°) and consistent with that deduced from γ-ray observations, provided that only one of the two hemispheres is active. The evidence for an extended hot spot in PSR J2021+4026, found also in other pulsars of similar age but not in older objects, suggests a possible age dependence of the emitting size of thermal X-rays.
description: Accepted for publication in A&A, 10 pages, 3 figures, 3 tables
On the Use of Local Diffusion Models for Path Ensemble Averaging in Potential of Mean Force Computations
Creators: name: Calderon, Christopher P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We use a constant velocity steered molecular dynamics (SMD) simulation of the stretching of deca-alanine in vacuum to demonstrate a technique that can be used to create surrogate stochastic processes using the time series that come out of SMD simulations. The surrogate processes are constructed by first estimating a sequence of local parametric models along a SMD trajectory and then a single global model is constructed by piecing the local models together through smoothing splines (estimation is made computationally feasible by likelihood function approximations). The calibrated surrogate models are then "bootstrapped" in order to simulate the large number of work paths typically needed to construct a potential of mean force (PMF) by appealing to Jarzynski's work theorem. When this procedure is repeated for a small number of SMD paths, it is shown that the global models appear to come from a single family of closely related diffusion processes. Possible techniques for exploiting this observation are also briefly discussed. The findings of this paper have potential relevance to computationally expensive computer simulations and experimental works involving optical tweezers where it difficult to collect a large number of samples, but possible to sample accurately and frequently in time.
description: working paper (33 pages, 11 figures)
An Algorithm to Construct Groebner Bases for Solving Integration by Parts Relations
Creators: name: Smirnov, A. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This paper is a detailed description of an algorithm based on a generalized Buchberger algorithm for constructing Groebner-type bases associated with polynomials of shift operators. The algorithm is used for calculating Feynman integrals and has proven itself efficient in several complicated cases.
description: LaTeX, 9 pages
title: Relacja obiekt eksponowania a przestrzeń eksponowania. Rola rozwiązań multimediach we współczesnych ekspozycjach
Creators: name: Gyurkovich, Magdalena
Publisher: name: Publishing House of Poznan University of Technology
Year: 2021

description: Zeszyty Naukowe Politechniki Poznańskiej. Architektura, Urbanistyka, Architektura wnętrz, 5, 71-84
Halo Wide Binaries and Moving Clusters as probes of the Dynamical and Merger History of our Galaxy
Creators: name: Allen, Christine
name: Poveda, Arcadio
name: Hernandez-Alcantara, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Wide or fragile pairs are sensitive probes of the galactic potential, and they have been used to provide information about the galactic tidal field, the density of GMC and the masses of dark matter perturbers present in both the disk and the halo. Halo wide binaries and moving clusters, since they are likely to be the remains of past mergers or of dissolved clusters, can provide information on the dynamical and merger history of our Galaxy. Such remnants should continue to show similar motions over times of the order of their ages. We have looked for phase space groupings among the low-metallicity stars of Schuster et al. (2006) and have identified a number of candidate moving clusters. In several of the moving clusters we found a wide CPM binary already identified in our catalogue of wide binaries among high-velocity and metal-poor stars (Allen et al 2000a). Spectroscopic follow-up studies of these stars would confirm the physical reality of the groups, as well as allow us to distinguish whether their progenitors are dissolved clusters or accreted extragalactic systems
description: 3 Figures. IAU Symposium 240 (Prague, 22-25 August 2006)
Non-formal education and development : a critical socio-historical analysis of B.C. First Nations agricultural extension
Creators: name: Palacios, Alejandro
Publisher: name: University of British Columbia
Year: 2009

description: The colonization of British Columbia by European immigrants beginning in the mid-1800s greatly restricted First Nations access to productive resources. Having lost control of their traditional territories and being able to secure only limited access to financial and agricultural extension services, many First Nations peoples living on reserves in south-central B.C. have had to endure living conditions similar to those usually associated with poor rural populations in less industrialized countries. The focus of this study is First Nations agricultural extension practice. The purpose is to understand why agricultural development has been slow on B.C. reserves despite the many efforts undertaken by governments in the form of financial and extension programs, especially from 1950 to the present. Two worldviews of "development" are discussed: western modernization and holism. These views encompass various streams of thought that helped to characterize - through a structurist historical research approach - the conceptions about development prevalent among First Nations leaders and key government policy-makers. They also assisted in understanding the nature of the relationships between development programs and agricultural extension practice. The study shows that although federal government development programs have enhanced, to a limited extent, the quality of material life on reserves, they have had little impact on non-material aspects of human existence. Development programs often ignored First Nations peoples' worldviews, having relied chiefly on the transfer of advanced modern technologies from the industrialized sectors of the economy. Furthermore, Euro- Canadian society, through the exercise of its social, political and cultural hegemony, has seriously limited First Nations' capacity to maintain their way of life, their economic systems and their cultural traditions. The historical analysis shows that First Nations agricultural development lacked strong support from Indian Affairs prior to 1979. Although the creation of First Nations institutions does not necessarily guarantee the implementation of development programs inspired by indigenous perspectives, the study indicates the need to train First Nations people as field extension personnel. Furthermore, development of agriculture on reserves involves settling the land question and recognizing First Nations' right to self-government so that they can design their own development and extension programs.
Optical Counterparts of Ultra Luminous X-ray Sources
Creators: name: Gutierrez, Carlos M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present optical identification and characterization of counterparts of four objects previously catalogued as ultra-luminous X-ray sources. The objects were selected from the Colbert & Ptak (2002) catalogue. The optical counterparts are identified as point-like objects with magnitudes in the range \~17-19. The optical spectra of three of the sources (IXO 32, 37 and 40) show the presence of emission lines typical of quasars. The position of these lines allows a precise estimation of their redshifts (2.769, 0.567 and 0.789 for IXO 32, 37 and 40 respectively). The fourth X-ray source, IXO35, is associated with a red object that has a spectrum typical of an M star in our Galaxy. These identifications are useful for building clean samples of ULX sources, selecting suitable targets for future observations and performing statistical studies on the different populations of X-ray sources.
description: 13 pages, 5 figures, accepted for publication in ApJL