cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Integrated parameters of star clusters: A comparison of theory and observations
Creators: name: Pandey, A. K.
name: Sandhu, T. S.
name: Sagar, R.
name: Battinelli, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: (Abridged) This paper presents integrated magnitude and colours for synthetic clusters. The integrated parameters have been obtained for the whole cluster population as well as for the main-sequence (MS) population of star clusters. We have also estimated observed integrated magnitudes and colours of MS population of galactic open clusters, LMC and SMC star clusters. It is found that the colour evolution of MS population of star clusters is not affected by the stochastic fluctuations, however these fluctuations significantly affect the colour evolution of the whole cluster population. The fluctuations are maximum in $(V-I)$ colour in the age range 6.7 $
description: 35 pages, 20 figs, accepted for publication in MNRAS
The LBK theorem to all orders
Creators: name: Engel, Tim
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the soft limit of one-photon radiation at next-to-leading power (NLP) in the framework of heavy-quark effective theory (HQET) to all orders in perturbation theory. We establish the soft theorem that for unpolarised scattering the radiative contribution up to NLP is entirely determined by the non-radiative amplitude. This generalises the Low-Burnett-Kroll (LBK) theorem for QED to all orders. All hard matching corrections can be calculated by applying the LBK differential operator to the non-radiative amplitude. The virtual corrections in the effective theory vanish beyond one loop, resulting in a one-loop exact soft function. As a first, non-trivial application we calculate the real-virtual-virtual electron-line corrections to muon-electron scattering at NLP in the soft limit.
description: 29 pages, 2 figures, minor corrections
Marine magnetic survey in the Mackenzie Bay/Beaufort Sea area arctic Canada
Creators: name: Goh, Rocque
Publisher: name: University of British Columbia
Year: 2011

description: This thesis presents an investigation of the variations in the magnetic field obtained in the Mackenzie Bay/Beaufort Sea area of the Canadian Arctic. It was found that the variations obtained at sea were strikingly correlated with those recorded at Point Atkinson, a fixed station on land, 150 miles from the survey area. In addition, it was found that the higher frequencies present in the marine records were severely attenuated with respect to the corresponding frequencies in the Point Atkinson recordings. It was concluded that the Mackenzie Bay/Beaufort Sea area is geomagnetically anomalous and that this situation is probably caused by higher electrical conductivity material underlying, the Mackenzie Bay/Beaufort Sea area, abutting lower conductivity material of the North American craton underlying Point Atkinson. This conclusion has important implications relating to the tectonic history of the Canadian Arctic.
A review on aggregation approaches of distributed energy resources
Creators: name: Tavares, Inês Vieira
Publisher: name: Neutro à Terra
Year: 2021

description: With the increasing penetration of distributed energy resources (DER) into the grid, the power system has suffered some changes to become more sustainable, flexible, and cost-effective. For this reason, a need for new ways of operating the power system is emerging. The control of DER such as PV power, controllable load, demand response (DR) programs, energy storage units, and electric vehicles will facilitate their integration by balancing operations in the electricity grid. The increase of DER is stressing the distributed nature of power systems, in terms of equipment and in terms of management and control. So, new entities such as aggregators are acting as mediators between endusers and grid operators to facilitate the management and control of the power system. This paper makes a review of different aggregation approaches that can be applied for the integration of the DER in the electric power system, based on recent literature. It focuses on the role of DR aggregators, load aggregators, and energy storage aggregators, and the concepts related to each of these topics are covered.
description: Neutro à Terra, N.º 26 (2020): Revista Técnico-Científica (Segundo Semestre)
СЛАВЯНСКАЯ ЛИТЕРАТУРА И ПИСЬМЕННОСТЬ В ЭПОХУ СРЕДНЕВЕКОВЬЯ
Creators: name: Илёсова, Нафиса
name: Исаева, Зера
Publisher: name: Zenodo
Year: 2025

description: В статье раскрывается особое положение славянской письменности как явления культурной и религиозной жизни в Европе раннего Средневековья, охарактеризованы взгляды создателей славянской письменности на историческую роль письменности на «местном» языке и расхождение этих взглядов с воззрениями, господствовавшими в латинском мире. Ключевые слова: письменность на своем языке, латынь, Священное писание, литургия.
Oscillatory large-scale circulation in liquid-metal thermal convection and its structural unit
Creators: name: Teimurazov, Andrei
name: Singh, Sanjay
name: Su, Sylvie
name: Eckert, Sven
name: Shishkina, Olga
name: Vogt, Tobias
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In Rayleigh-Bénard convection (RBC), the size of a flow domain and its aspect ratio $\varGamma$ (a ratio between the spatial length and height of the domain) affect the shape of the large-scale circulation (LSC). For some aspect ratios, the flow dynamics include a three-dimensional oscillatory mode known as a jump-rope vortex (JRV), however, the effects of varying aspect ratios on this mode are not well investigated. In this paper, we study these aspect-ratio effects in liquid metals, for a low Prandtl number $Pr=0.03$. Direct numerical simulations and experiments are carried out for a Rayleigh number range $2.9 \times 10^4 \leq Ra \leq 1.6 \times 10^6$ and square cuboid domains with $\varGamma=2$, $2.5$, $3$ and $5$. Our study demonstrates that a repeating pattern of a JRV encountered at an aspect ratio $\varGamma \approx 2.5$ is the basic structural unit that builds up to a lattice of interlaced JRVs at the largest aspect ratio. The size of the domain determines how many structural units are self-organized within the domain; the number of the realized units is expected to scale as $\varGamma^2$ with sufficiently large and growing $\varGamma$. We find the oscillatory modes for all investigated $\varGamma$, however, they are more pronounced for $\varGamma=2.5$ and $\varGamma=5$. Future studies for large-aspect ratio domains of different shapes would enhance our understanding of how the JRVs adjust and reorganize at such scaled-up geometries, and answer the question of whether they are indeed the smallest superstructure units.
description: 26 pages, 16 figures
Organolanthanide chemistry of modified porphyrinogens
Creators: name: Wang, Jun
Publisher: name: University Of Tasmania
Year: 2023

description: This thesis describes studies into the synthesis, characterisation and reactivity of samarium(II) and (Ill) halide, alkyl and amide complex~s derived from the modified porphyrinogens meso-octaethyl-trans-dioxaporphyrinogen, Et8O2N2H2, and trans-N,N'-dimethyl-meso-octaethylporphyrinogen, Et8NMe2H2. The macrocycles themselves and various Group 1 metal derivatives that are accessed in the preparation of the target lanthanide complexes are also described in relation to their synthesis, characterisation and reactivity.
Zero-shot text-to-speech synthesis conditioned using self-supervised speech representation model
Creators: name: Fujita, Kenichi
name: Ashihara, Takanori
name: Kanagawa, Hiroki
name: Moriya, Takafumi
name: Ijima, Yusuke
Publisher: name: arXiv
Year: 2023
Subjects: subject: Sound (cs.SD)
subject: Machine Learning (cs.LG)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper proposes a zero-shot text-to-speech (TTS) conditioned by a self-supervised speech-representation model acquired through self-supervised learning (SSL). Conventional methods with embedding vectors from x-vector or global style tokens still have a gap in reproducing the speaker characteristics of unseen speakers. A novel point of the proposed method is the direct use of the SSL model to obtain embedding vectors from speech representations trained with a large amount of data. We also introduce the separate conditioning of acoustic features and a phoneme duration predictor to obtain the disentangled embeddings between rhythm-based speaker characteristics and acoustic-feature-based ones. The disentangled embeddings will enable us to achieve better reproduction performance for unseen speakers and rhythm transfer conditioned by different speeches. Objective and subjective evaluations showed that the proposed method can synthesize speech with improved similarity and achieve speech-rhythm transfer.
description: 5 pages,3 figures, Accepted to IEEE ICASSP 2023 workshop Self-supervision in Audio, Speech and Beyond
Estimação de Estado nos Sistemas Elétricos de Energia
Creators: name: Carvalho, José António Beleza
Publisher: name: Neutro à Terra
Year: 2021

description: Nos Sistemas Elétricos de Energia (SEE), as tensões, as correntes e o trânsito de energia em todas as linhas do sistema de transmissão estão continuamente a ser monitorizadas pelos operadores do sistema. Estes dados são usados em modelos do sistema elétrico que incluem as linhas, transformadores, geradores e cargas. Estes modelos são conhecidos como estimadores de estado, e os seus resultados são o estado estimado do sistema. O Estado de um sistema elétrico de energia é uma “amostragem” das tensões e correntes do sistema, que de uma só vez os operadores usam para avaliar a condição do sistema e, se necessário, tomarem ações e intervir no seu funcionamento. Por exemplo, os operadores podem usar os resultados do modelo para identificar anomalias nas condições de funcionamento do sistema, no despacho da produção e para evitar que os limites de estabilidade e limites térmicos sejam violados. Como acontece com qualquer modelo, o resultado do estimador de estado é apenas uma aproximação do verdadeiro e real estado do sistema. Uma razão é que as medições obtidas no sistema, e que chegam aos centros de controlo através do sistema de Supervisão Controlo e Aquisição de Dados (SCADA), não são enviadas no mesmo instante; os dados enviados podem-se prolongar por um período de vários segundos e, portanto, os valores do ângulo de fase das tensões não podem ser observados. Outra situação, é que esses dados nem sempre são precisos. Os estimadores de estado contornam esta situação recorrendo à redundância de medições efetuadas em todo o sistema. Os estimadores de estado usam um algoritmo iterativo, e o estado estimado do sistema é obtido após várias iterações até convergir para uma solução. O algoritmo não é perfeito, e os estimadores de estado apresentam problemas para estimar um estado do sistema durante situações anómalas ou de emergência, infelizmente quando são mais necessários.
description: Neutro à Terra, N.º 26 (2020): Revista Técnico-Científica (Segundo Semestre)
Inferring sparse Gaussian graphical models with latent structure
Creators: name: Ambroise, Christophe
name: Chiquet, Julien
name: Matias, Catherine
Publisher: name: arXiv
Year: 2008
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Our concern is selecting the concentration matrix's nonzero coefficients for a sparse Gaussian graphical model in a high-dimensional setting. This corresponds to estimating the graph of conditional dependencies between the variables. We describe a novel framework taking into account a latent structure on the concentration matrix. This latent structure is used to drive a penalty matrix and thus to recover a graphical model with a constrained topology. Our method uses an $\ell_1$ penalized likelihood criterion. Inference of the graph of conditional dependencies between the variates and of the hidden variables is performed simultaneously in an iterative \textsc{em}-like algorithm. The performances of our method is illustrated on synthetic as well as real data, the latter concerning breast cancer.
description: 35 pages, 15 figures
Comparison of standard and stabilization free Virtual Elements on anisotropic elliptic problems
Creators: name: Berrone, Stefano
name: Borio, Andrea
name: Marcon, Francesca
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65N12, 65N30

description: In this letter we compare the behaviour of standard Virtual Element Methods (VEM) and stabilization free Enlarged Enhancement Virtual Element Methods (E$^2$VEM) with the focus on some elliptic test problems whose solution and diffusivity tensor are characterized by anisotropies. Results show that the possibility to avoid an arbitrary stabilizing part, offered by E$^2$VEM methods, can reduce the magnitude of the error on general polygonal meshes and help convergence.
Editorial
Creators: name: Carvalho, José António Beleza
Publisher: name: Neutro à Terra
Year: 2021

description: Estimados leitores, Mantendo o compromisso que temos convosco, voltamos à vossa presença com mais uma publicação. No meio de uma pandemia que está a abalar a nossa sociedade, compete-nos agir com civismo, competência e responsabilidade, de forma a minimizar os efeitos devastadores que a situação atual terá na economia e na vida das pessoas. O momento não é para desistir e, assim, voltamos à vossa presença com mais uma edição da revista “Neutro à Terra”, que já vai na vigésima sexta publicação em treze anos de existência. Os incentivos que recebemos não deixam esmorecer a nossa motivação para continuar a intervir na área da Engenharia Eletrotécnica. Nesta edição da revista merecem destaque os temas relacionados com a gestão dos sistemas elétricos de energia, as instalações elétricas, as máquinas elétricas, as infraestruturas de telecomunicações e as energias renováveis. Nos Sistemas Elétricos de Energia (SEE), as tensões, as correntes e o trânsito de energia em todas as linhas do sistema de transmissão estão continuamente a ser monitorizadas pelos operadores do sistema. Estes dados são usados em modelos do sistema elétrico que incluem as linhas, transformadores, geradores e cargas. Estes modelos são conhecidos como estimadores de estado, e os seus resultados são o estado estimado do sistema. O Estado de um sistema elétrico de energia é uma “amostragem” das tensões e correntes do sistema, que, de uma só vez, os operadores usam para avaliar a condição do sistema e, se necessário, tomarem ações e intervir no seu funcionamento. Nesta edição da revista apresenta-se um artigo que aborda o problema da estimação de estado dos SEE, uma das mais importantes ações de gestão, monitorização e condução em segurança, efetuada nos centros de controlo dos atuais SEE.
description: Neutro à Terra, N.º 26 (2020): Revista Técnico-Científica (Segundo Semestre)
A Statistical Prescription to Estimate Properly Normalized Distributions of Different Particle Species
Creators: name: Casarsa, Massimo
name: Catastini, Pierluigi
name: Punzi, Giovanni
name: Ristori, Luciano
Publisher: name: arXiv
Year: 2009
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We describe a statistical method to avoid biased estimation of the content of different particle species. We consider the case when the particle identification information strongly depends on some kinematical variables, whose distributions are unknown and different for each particles species. We show that the proposed procedure provides properly normalized and completely data-driven estimation of the unknown distributions without any a priori assumption on their functional form. Moreover, we demonstrate that the method can be generalized to any kinematical distribution of the particles.
Study of afterpulsing in optical image intensifiers
Creators: name: Mahon, Ryan
name: Orlov, Dmitry
name: Glazenborg, Rene
name: Nomerotski, Andrei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We will describe the characteristics of the afterpulsing effect seen in the optical intensifiers. It can be caused by either secondary electrons produced by primary photoelectrons hitting the micro-channel plate surface or by electron emission from the photocathode induced by the ion feedback. The result of this effect are additional pulses delayed with respect to the primary parent pulses. Using a fast data-driven camera, Tpx3Cam, we were able to clearly show afterpulsing present in the data at short time differences and small distances from the primary pulse, as well as to show the evolution of the afterpulsing effect with increasing time difference. We also studied the afterpulsing spatial distribution and observed an azimuthal asymmetry, which we attribute to the afterpulsing ion component.
The fundamental rotation-vibration spectrum of HD
Creators: name: Bejar Hurtado, Jose Antonio
Publisher: name: University of British Columbia
Year: 2011

description: Isotoplcally substituted molecules such as HD, unlike ordinary homonuclear diatomic molecules, possess a small electric dipole moment. This effect is a consequence of asymmetric slippage of the electron cloud with nuclear vibration. The matrix element of the dipole moment for the transition v=0 to v=1 in the ground electronic state of HD has been experimentally determined by using Fourier Transform spectroscopic methods. At pressures below 2 atm the width of the lines due to these transitions has been found to be limited by pure Doppler broadening w = 0.026 cm⁻¹, hence no collision narrowing, as occurs in H₂, has been observed. From the resolved lines the absolute intensities were obtained and the matrix element computed. The dipole moment  for the R-branch has been found to increase with J from 4.15 x 10⁻⁵ debye, for J = 0, to 8.42 x 10⁻⁵ debye for J = 4. Because of the high resolution used, new highly reliable frequencies have been obtained.
Historical development of the pipa
Creators: name: Wei, D
Publisher: name: University Of Tasmania
Year: 2023

description: The Pipo is a traditional plucked instrument, and originated from two separate precursors. The first type of Pipa consisted of two major forms: the Qin Pipa and the Han Pipa. According to the historical records, the first type of Pipa appeared in ancient times (about 214 BC - 105 BC). The Qin Pi pa was an embryonic instrument and was developed from a percussion instrument called the Tao Gu. The Han Pipa was based on other older plucked instruments, such as the Qin, Se, Zheng and Kun Hou. The first type of Pipa was named the Ruan Xian in the seventh century AD. The second type of Pipa originated in the Western Region. It came to northern China around the fourth century AD, and was introduced to southern China in the middle of the sixth century AD. This kind of Pipa had two major forms: the Crooked-neck Pipa and the Five-stringed Pipa. However, the Five-stringed Pipa disappeared from China around the tenth century AD. Only the Crooked-neck Pipa was developed on a larger scale. Since Chinese ancient music traditions and Western Regions music tradition came together, the two kinds of Pipa influenced each other. Gradually, the Crooked-neck Pipa was replaced by the Classical Pipa. Historical material indicates that this process was completed around the fourteenth century AD. Up to the nineteenth century, a wealth of traditional Pipa music was accumulated. The development of the Pipa in the twentieth century was greatly influenced both by Chinese folk music and western music of the eighteenth and nineteenth centuries. The Classical Pipa was replaced by the Contemporary Pipa in the 1950s, and Chinese musicians have continued to make great advancements in all areas connected with the Contemporary Pipa. The first chapter investigates, from a wide range of Chinese source material, the earliest historical backgrounds of the Pipa; the second and third chapters examine the development of the two precursors of the modern Pipa; chapter four focuses on the emergence of the single Classical Pipa, and in the final chapter the Contemporary Pipa is studied in terms of major structural developments, changes to playing techniques and its influence on present-day Chinese compositions.
Improving Speech Translation Accuracy and Time Efficiency with Fine-tuned wav2vec 2.0-based Speech Segmentation
Creators: name: Fukuda, Ryo
name: Sudoh, Katsuhito
name: Nakamura, Satoshi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Speech translation (ST) automatically converts utterances in a source language into text in another language. Splitting continuous speech into shorter segments, known as speech segmentation, plays an important role in ST. Recent segmentation methods trained to mimic the segmentation of ST corpora have surpassed traditional approaches. Tsiamas et al. proposed a segmentation frame classifier (SFC) based on a pre-trained speech encoder called wav2vec 2.0. Their method, named SHAS, retains 95-98% of the BLEU score for ST corpus segmentation. However, the segments generated by SHAS are very different from ST corpus segmentation and tend to be longer with multiple combined utterances. This is due to SHAS's reliance on length heuristics, i.e., it splits speech into segments of easily translatable length without fully considering the potential for ST improvement by splitting them into even shorter segments. Longer segments often degrade translation quality and ST's time efficiency. In this study, we extended SHAS to improve ST translation accuracy and efficiency by splitting speech into shorter segments that correspond to sentences. We introduced a simple segmentation algorithm using the moving average of SFC predictions without relying on length heuristics and explored wav2vec 2.0 fine-tuning for improved speech segmentation prediction. Our experimental results reveal that our speech segmentation method significantly improved the quality and the time efficiency of speech translation compared to SHAS.
description: Accepted by IEEE/ACM Transactions on Audio, Speech, and Language Processing
Effect of nonequilibrium phonons on hot-electron spin relaxation in n-type GaAs quantum wells
Creators: name: Zhang, P.
name: Wu, M. W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have studied the effect of nonequilibrium longitudinal optical phonons on hot-electron spin relaxation in $n$-type GaAs quantum wells. The longitudinal optical phonons, due to the finite relaxation rate, are driven to nonequilibrium states by electrons under an in-plane electric field. The nonequilibrium phonons then in turn influence the electron spin relaxation properties via modifying the electron heating and drifting. The spin relaxation time is elongated due to the enhanced electron heating and thus the electron-phonon scattering in the presence of nonequilibrium phonons. The frequency of spin precession, which is roughly proportional to the electron drift velocity, can be either increased (at low electric field and/or high lattice temperature) or decreased (at high electric field and/or low lattice temperature). The nonequilibrium phonon effect is more pronounced when the electron density is high and the impurity density is low.
description: 6 pages, 3 figures
Quasi Transverse Momentum Dependent Distributions at Next-to-Next-to-Leading order
Creators: name: del Río, Óscar
name: Vladimirov, Alexey
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The partons' transverse momentum can be explored with QCD lattice simulations by studying the quasi-transverse-momentum-dependent parton distribution functions (qTMDPDFs), which are factorized in terms of physical TMDPDFs and soft factors in the limit of the large hadron's momentum. We present the next-to-next-to-leading order (NNLO) calculation of the coefficient function for this factorization. Together with already known expressions for anomalous dimensions, this result allows analysis of lattice data at NNLO perturbative accuracy.
description: 8 pages, 2 figures; v2: N3LO logarithms added in appendix; v3: Corrected misprint on (33), and misprints
NATALITY. PHILOSOPHICAL RUDIMENTS CONCERNING A GENERATIVE PHENOMENOLOGY
Creators: name: Schües, Christina
Publisher: name: Thaumàzein | Rivista di Filosofia
Year: 2018
Subjects: Birth; Human Condition; Relationship; Constitution; Generativity; History of Philosophy; Phenomenology

description: In light of the dominant role mortality and death have played in the history of philosophy, I give a few examples of the metaphorical appropriation and (dis-)regard of natality from Plato to the Enlightenment and Heidegger’s phenomenology of being-there. In the second part of the paper, I enfold the meaning of birth as transition and disruption, its meaning for intentionality, and its structural importance for understanding the relationality and generativity of human existence. The three basic questions of ‘Where do I come from?’ ‘From whom am I born?’ and ‘With whom am I born?’ and the incapability of remembering one’s own birth are fundamental to the co-constitution of personal identity and recognizing the centrality of human relations. Understanding natality as a human and worldly condition means putting human relations at the centre of our concerns.
description: Thaumàzein | Rivista di Filosofia, Vol 4 (2016): Vol. 5 (2017) - Volume doppio: Filosofia della nascita
Enhancement of photoacoustic spectroscopy with sorption enrichment for ppt-level benzene detection
Creators: name: Karhu, Juho
name: Hieta, Tuomas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: A real time trace gas detector for benzene is demonstrated. The measurement system takes an advantage of modest enrichment through short adsorption periods to reach a ppt-level detection limit with a sampling cycle of 90 s, which includes sample adsorption, desorption and a spectroscopic measurement. Benzene is collected on Tenax TA sorbent for 30 s and then detected from the enriched samples with photoacoustic spectroscopy. A high sensitivity is achieved using cantilever-enhanced photoacoustic spectroscopy and a continuous-wave quantum cascade laser emitting at the wavelength 14.8 $μ$m, which corresponds to the absorption wavelength of the strongest benzene infrared band. We reach a detection limit of 150 ppt of benzene, over one sampling cycle. Interference from humidity and other common petrochemicals is evaluated.
description: 8 pages, 7 figures
Electrical Tuning of Terahertz Plasmonic Crystal Phases
Creators: name: Sai, P.
name: Korotyeyev, V. V.
name: Dub, M.
name: Słowikowski, M.
name: Filipiak, M.
name: But, D. B.
name: Ivonyak, Yu.
name: Sakowicz, M.
name: Lyaschuk, Yu. M.
name: Kukhtaruk, S. M.
name: Cywiński, G.
name: Knap, W.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We present an extensive study of resonant two-dimensional (2D) plasmon excitations in grating-gated quantum well heterostructures, which enable an electrical control of periodic charge carrier density profile. Our study combines theoretical and experimental investigations of nanometer-scale AlGaN/GaN grating-gate structures and reveals that all terahertz (THz) plasmonic resonances in these structures can be explained only within the framework of the plasmonic crystal model. We identify two different plasmonic crystal phases. The first is the delocalized phase, where THz radiation interacts with the entire grating-gate structure that is realized at a weakly modulated 2D electron gas (2DEG) regime. In the second, the localized phase, THz radiation interacts only with the ungated portions of the structure. This phase is achieved by fully depleting the gated regions, resulting in strong modulation. By gate-controlling of the modulation degree, we observe a continuous transition between these phases. We also discovered that unexpectedly the resonant plasma frequencies of ungated parts (in the localized phase) still depend on the gate voltage. We attribute this phenomenon to the specific depletion of the conductive profile in the ungated region of the 2DEG, the so-called edge gating effect. Although we study a specific case of plasmons in AlGaN/GaN grating-gate structures, our results have a general character and are applicable to any other semiconductor-based plasmonic crystal structures. Our work represents the first demonstration of an electrically tunable transition between different phases of THz plasmonic crystals, which is a crucial step towards a deeper understanding of THz plasma physics and the development of all-electrically tunable devices for THz optoelectronics.
description: 16 pages, 14 figures
Mass Inflation in Brans-Dicke gravity
Creators: name: Avelino, P. P.
name: Hamilton, A. J. S.
name: Herdeiro, C. A. R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A detailed non-linear analysis of the internal structure of spherical, charged black holes that are accreting scalar matter is performed in the framework of the Brans-Dicke theory of gravity. We choose the lowest value of the Brans-Dicke parameter that is compatible with observational constraints. First, the homogeneous approximation is used. It indicates that mass inflation occurs and that the variations of the Brans-Dicke scalar inside the black hole, which could in principle be large in the absence of mass inflation, become small when mass inflation does occur. Then, a full non-linear numerical study of the black hole interior perturbed by a self-gravitating massless uncharged scalar-field is performed. We use an algorithm with adaptive mesh refinement capabilities. In this way, the changes in the internal structure of the black hole caused by mass inflation are determined, as well as the induced variations of the Brans-Dicke scalar, confirming, qualitatively, the indications given by the homogeneous approximation.
description: 14 pages, 15 figures
Painting a visual language that interprets my personal world
Creators: name: Young, AH
Publisher: name: University Of Tasmania
Year: 2023

description: This research project is based on the pursuit of a new personal visual language that interprets my immediate world. My paintings and drawings are grounded in my immediate environment and evolve directly out of personal experience. Central to my investigation is the development of a new set of symbols and an examination of how they have evolved. Recording these experiences in an autobiographical and diaristic way is a fundamental part of my process. Journal sketching and independent drawing is critical to the evolution of the paintings, particularly their combination of pictograms and text. The work charts my navigation through space and also describes the characters that I come in contact with, communicate with or just \bump up against\". The characters I describe fall into three categories; people I know well people I hardly know and people I imagine and would like to meet. I have an unusual neurological condition which involves problems with balance weakness and tremor. These influence how I look and behave in a way that makes me appear \"different\" and makes my view of the world and my place in it unique. This element of being different results in me being involved in some situations which make me feel uncomfortable uneasy vulnerable and at times frustrated. My physical limitations also determine my painting style. This project is positioned within the field of artists who came to prominence in the 1980s representing a move away from Modernism's international language and a return to the developing of a personal language. Such artists include the Americans Jean-Michel Basquiat and Philip Guston as well as Australian artists Gareth Sansom and Gordon Bennett. These artists all sought and articulated a personal vocabulary of signs and symbols relating to contemporary popular urban culture and informed my own pursuit of a visual language with particular iconographies and modes of expression."
TRASFORMAZIONE E GERMINAZIONE. PER UNA NUOVA FILOSOFIA DELLA NASCITA
Creators: name: Cusinato, Guido
Publisher: name: Thaumàzein | Rivista di Filosofia
Year: 2018
Subjects: Philosophy of Birth; Transformation; Evolutionism; the Possible and the Real; Ideation; Cause and Effect; Finalism; Creativity; Expressivity; Hunger for Being Born; Spinoza; Bergson; Arendt; Scheler; Zambrano.

description: The thesis of this paper is that – in order to avoid trivializations – a Philosophy of Birth needs to elaborate a precise concept of transformation and distinguish it carefully from that of adaptation. While transformation goes beyond the limited self-referential perspective of an individual and, on the social level, of the gregarious identity, adaptation aims at strengthening or preserving the old self-referential equilibrium. Transformation is driven by what Zambrano has called, with an exceptionally happy expression, the “hunger to be born completely”. Such a hunger pushes one to continue one’s own birth through the encounter with the Other. Transformation has a creative feature that is made possible by two factors: the surplus of the effect over the cause, and the priority of the real over the possible. These premises lead to a radical questioning of the primacy of the possible on the real, at least as it has been conceived so far in mainstream Western philosophy, with few exceptions, such as Schelling, Bergson and Scheler. In the first part of this text, I shall consider a new Philosophy of Birth in the light of the concept of transformation and in this regard deal with several core themes such as the hunger to be born completely, the new beginning, creative time, the priority of the real over the possible, the limits of finalism, the surplus of effect over cause, and the creative force that expresses itself in the act of ideation. In the second part, I shall analyze the relation between birth and death and focus especially on their intimate and reciprocal connection by referring to the image of the seed that, after falling on the ground, germinates and breaks its own integument.
description: Thaumàzein | Rivista di Filosofia, Vol 4 (2016): Vol. 5 (2017) - Volume doppio: Filosofia della nascita
University of Padova working on historical maps, aerial photography and LIDAR
Creators: name: Delgado, Lara
Publisher: name: Archaeology Data Service
Year: 2015

description: This resource is a single blog post created as part of the Day of Archaeology initiative. The Day of Archaeology project aimed to provide a window into the daily lives of archaeologists from all over the world. The project asked people working, studying or volunteering in the archaeological world to participate in a 'Day of Archaeology' each year by recording their day and sharing it through text, images or video on the Day of Archaeology blog.
The project asked anyone with a personal, professional or voluntary interest in archaeology to get involved, and help highlight the reasons why archaeology is vital to protect the past and inform our futures. The resulting Day of Archaeology project archive demonstrates the wide variety of work the archaeological profession undertakes day-to-day across the globe, and helps to raise public awareness of the relevance and importance of archaeology to the modern world.
The first ever Day of Archaeology was held in 2011 and, since then, the project had thousands of archaeologists take part in the event, from those working in the field through to specialists working in laboratories and behind computers. The last Day of Archaeology was on Friday 28th July 2017.
Local flow control by phononic subsurfaces over extended spatial domains
Creators: name: Kianfar, Armin
name: Hussein, Mahmoud I.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Local phonon motion underneath a surface interacting with a flow may cause the flow to passively stabilize, or destabilize, as desired within the region adjacent to the subsurface motion. This mechanism has been extensively analyzed over only a spatial region on the order of the instability wavelength along the fluid-structure interface. Here we uncover fundamental relations between the behavior of flow instabilities and the frequency response characteristics of the phononic subsurface structure admitting the elastic motion. These relations are then utilized to demonstrate the possibility of extensive spatial expansion of the control regime along the downstream direction with minimal loss of performance--potentially covering the entire surface exposed to the flow.
A day for planning, changing, disseminating Ancient Egyptian demons
Creators: name: , Kasia
Publisher: name: Archaeology Data Service
Year: 2015

description: This resource is a single blog post created as part of the Day of Archaeology initiative. The Day of Archaeology project aimed to provide a window into the daily lives of archaeologists from all over the world. The project asked people working, studying or volunteering in the archaeological world to participate in a 'Day of Archaeology' each year by recording their day and sharing it through text, images or video on the Day of Archaeology blog.
The project asked anyone with a personal, professional or voluntary interest in archaeology to get involved, and help highlight the reasons why archaeology is vital to protect the past and inform our futures. The resulting Day of Archaeology project archive demonstrates the wide variety of work the archaeological profession undertakes day-to-day across the globe, and helps to raise public awareness of the relevance and importance of archaeology to the modern world.
The first ever Day of Archaeology was held in 2011 and, since then, the project had thousands of archaeologists take part in the event, from those working in the field through to specialists working in laboratories and behind computers. The last Day of Archaeology was on Friday 28th July 2017.
Archiving Ipswich
Creators: name: OBrien, Jenny
Publisher: name: Archaeology Data Service
Year: 2015

description: This resource is a single blog post created as part of the Day of Archaeology initiative. The Day of Archaeology project aimed to provide a window into the daily lives of archaeologists from all over the world. The project asked people working, studying or volunteering in the archaeological world to participate in a 'Day of Archaeology' each year by recording their day and sharing it through text, images or video on the Day of Archaeology blog.
The project asked anyone with a personal, professional or voluntary interest in archaeology to get involved, and help highlight the reasons why archaeology is vital to protect the past and inform our futures. The resulting Day of Archaeology project archive demonstrates the wide variety of work the archaeological profession undertakes day-to-day across the globe, and helps to raise public awareness of the relevance and importance of archaeology to the modern world.
The first ever Day of Archaeology was held in 2011 and, since then, the project had thousands of archaeologists take part in the event, from those working in the field through to specialists working in laboratories and behind computers. The last Day of Archaeology was on Friday 28th July 2017.
Supplementary table and figures from Pigeons retain partial memories of homing paths years after learning them individually, collectively or culturally
Creators: name: Collet, Julien
name: Sasaki, Takao
name: Biro, Dora
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 170299 Cognitive Science not elsewhere classified
subject: FOS: Psychology
subject: 60801 Animal Behaviour
subject: FOS: Biological sciences

description: Memory of past experience is central to many animal decisions, but how long specific memories can influence behaviour is poorly understood. Few studies have reported memories retrieved after several years in non-human animals, especially for spatial tasks, and whether the social context during learning could affect long-term memory retention. We investigated homing pigeons' spatial memory by GPS-recording their homing paths from a site 9 km from their loft. We compared solo flights of naive pigeons with those of pigeons that had last homed from this site 3–4 years earlier, having learnt a homing route either alone (individual learning), together with a naive partner (collective learning) or within cultural transmission chains (cultural learning). We used as a control a second release site unfamiliar to all pigeons. Pigeons from all learning treatments outperformed naive birds at the familiar (but not the unfamiliar) site, but the idiosyncratic routes they formerly used several years before were now partially forgotten. Our results show that non-human animals can use their memory to solve a spatial task years after they last performed it, irrespective of the social context during learning. They also suggest that without reinforcement, landmarks and culturally acquired ‘route traditions' are gradually forgotten.
Catastrophic magnetic flux avalanches in NbTiN superconducting resonators
Creators: name: Nulens, Lukas
name: Lejeune, Nicolas
name: Caeyers, Joost
name: Marinković, Stefan
name: Cools, Ivo
name: Dausy, Heleen
name: Basov, Sergey
name: Raes, Bart
name: Van Bael, Margriet J.
name: Geresdi, Attila
name: Silhanek, Alejandro V.
name: Van de Vondel, Joris
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Macroscopic superconducting components are an important building block of various quantum circuits. Since several of the envisioned applications require exposure to magnetic fields, it is of utmost importance to explore the impact of magnetic fields on their performance. Here we explore the complex pattern of magnetic field penetration and identify its impact on the resonance frequency of NbTiN superconducting resonators by combining magneto-optical imaging and high-frequency measurements. At temperatures below approximately half of the superconducting critical temperature, the development of magnetic flux avalanches manifests itself as a noisy response in the field-dependent resonance frequency. Magneto-optical imaging reveals different regimes and distinguishes the impact of avalanches in the ground plane and resonator. Our findings demonstrate that superconducting resonators represent a valuable tool to investigate magnetic flux dynamics. Moreover, the current blooming of niobium-based superconducting radio-frequency devices makes this report timely by unveiling the severe implications of magnetic flux dynamics.
description: 20 pages, 3 figures, 2 supp. figures, 3 supp. videos
Review on Neutrino Telescopes
Creators: name: Montaruli, Teresa
Publisher: name: arXiv
Year: 2009
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: I will discuss the motivations for Neutrino Astronomy and its prospects given the current experimental scenario, which is the main focus of this paper. I will also go through the first results of the IceCube detector deep in the ice and of the ANTARES undersea telescope underlying complementary aspects, common and different challenges. It is an exciting time for this science since the first completed undersea detector is successfully taking data and the first cubic kilometer detector is going to be shortly more than half-way from its completion in Antarctica.
description: Proceeding of CRIS2008 Conference, Salina, Sept. 2008, 9 pages, 8 figures
Hidden Conformal Symmetry from the Lattice
Creators: name: LSD Collaboration
name: Appelquist, T.
name: Brower, R. C.
name: Cushman, K. K.
name: Fleming, G. T.
name: Gasbarro, A.
name: Hasenfratz, A.
name: Ingoldby, J.
name: Jin, X. Y.
name: Neil, E. T.
name: Osborn, J. C.
name: Rebbi, C.
name: Rinaldi, E.
name: Schaich, D.
name: Vranas, P.
name: Weinberg, E.
name: Witzel, O.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze newly expanded and refined data from lattice studies of an SU(3) gauge theory with eight Dirac fermions in the fundamental representation. We focus on the light composite states emerging from these studies, consisting of a set of pseudoscalars and a single light scalar. We first consider the view that this theory is just outside the conformal window. In this case, the pseudoscalars arise from spontaneous breaking of chiral symmetry. Identifying the scalar in this case as an approximate dilaton, we fit the lattice data to a dilaton effective field theory, finding that it yields a good fit even at lowest order. For comparison, we then consider the possibility that the theory is inside the conformal window. The fermion mass provides a deformation, triggering confinement. We employ simple scaling laws to fit the lattice data, and find that it is of lesser quality.
description: 7 pages, 2 figures, version accepted for publication
Go with the FLO
Creators: name: Cassidy, Julie
Publisher: name: Archaeology Data Service
Year: 2015

description: This resource is a single blog post created as part of the Day of Archaeology initiative. The Day of Archaeology project aimed to provide a window into the daily lives of archaeologists from all over the world. The project asked people working, studying or volunteering in the archaeological world to participate in a 'Day of Archaeology' each year by recording their day and sharing it through text, images or video on the Day of Archaeology blog.
The project asked anyone with a personal, professional or voluntary interest in archaeology to get involved, and help highlight the reasons why archaeology is vital to protect the past and inform our futures. The resulting Day of Archaeology project archive demonstrates the wide variety of work the archaeological profession undertakes day-to-day across the globe, and helps to raise public awareness of the relevance and importance of archaeology to the modern world.
The first ever Day of Archaeology was held in 2011 and, since then, the project had thousands of archaeologists take part in the event, from those working in the field through to specialists working in laboratories and behind computers. The last Day of Archaeology was on Friday 28th July 2017.