cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spin Fluctuations in Sr$_{1.8}$La$_{0.2}$RuO$_4$
Creators: name: He, Zheng
name: Wang, Qisi
name: Feng, Yu
name: Kim, Chul
name: Kyung, Wonshik
name: Kim, Changyoung
name: Wo, Hongliang
name: Ding, Gaofeng
name: Hao, Yiqing
name: Liu, Feiyang
name: Walker, Helen C.
name: Adroja, Devashibhai T.
name: Schneidewind, Astrid
name: Wang, Wenbin
name: Zhao, Jun
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We use inelastic neutron scattering to study spin fluctuations in Sr$_{1.8}$La$_{0.2}$RuO$_4$, where Lanthanum doping triggers a Lifshitz transition by pushing the van Hove singularity in the $γ$ band to the Fermi energy. Strong spin fluctuations emerge at an incommensurate wave vector $\mathbf{Q}_{ic} = (0.3,0.3)$, corresponding to the nesting vector between $α$ and $β$ Fermi sheets. The incommensurate antiferromagnetic fluctuations shift toward $(0.25,0.25)$ with increasing energy up to ${\sim}110$ meV. By contrast, scatterings near the ferromagnetic wave vectors $\mathbf{Q} = (1,0)$ and $(1,1)$ remain featureless at all energies. This contradicts the weak-coupling perspective that suggests a sharp enhancement of ferromagnetic susceptibility due to the divergence of density of states in the associated $γ$ band. Our findings imply that ferromagnetic fluctuations in Sr$_2$RuO$_4$ and related materials do not fit into the weak-coupling paradigm, but instead are quasi-local fluctuations induced by Hund's coupling. This imposes significant constraints for the pairing mechanism involving spin fluctuations.
description: 7 pages, 4 figures
EXAMINING CAPITALIZATION DYNAMICS: THE PERFORMANCE OF BANKS IN ZIMBABWE (2009-2013)
Creators: name: Tinashe, Farai Chikwava
name: Nyasha, Tendai Mukwacha
Publisher: name: AMERICAN SERIAL
Year: 2024
Subjects: Global financial crisis
prudential regulation
financial stability
monetary policy
Regulatory mechanisms

description: The global financial crisis of 2008-2012 exposed significant inadequacies in existing prudential regulatory frameworks, prompting calls for reform initiatives. A key lesson learned from the crisis was the banking system's inadequate capital reserves. Moreover, past financial crises underscored that monetary policy objectives extend beyond price stability alone. Robust micro-prudential regulation and supervision, while essential, are insufficient safeguards against risks to financial sector stability. These lessons necessitate the development of initiatives by monetary authorities to enhance the resilience of the financial sector. This review examines the implications of the global financial crisis on prudential regulatory arrangements, emphasizing the importance of stronger regulatory mechanisms to complement existing guidelines and mitigate systemic risks to financial stability.
Neuro-fuzzy system dynamics technique for modeling construction systems
Creators: Seresht, Nima Gerami
Robinson Fayek, Aminah
Publisher: name: University of Alberta Library
Year: 2020

The performance of construction systems (e.g., activities, operations, projects) is commonly measured using different indicators, such as productivity or production rate. The accurate prediction of performance, which is an important concern of construction researchers and practitioners, requires effective techniques for construction modeling. However, the complexity of construction systems creates three challenges for construction modeling: (1) construction systems are affected by numerous interacting factors, (2) the factors that affect construction systems often exhibit both probabilistic and non-probabilistic uncertainty, and (3) construction systems are dynamic. Fuzzy system dynamics (FSD) is a simulation technique that can be used for modeling construction systems with the potential to address these three challenges. However, the application of FSD in construction is still limited due to its low accuracy for modeling the non-linear, complex, and highly-dimensional relationships that exist between the system variables. Currently, these system relationships are most often defined in FSD by linear regression, due its computational simplicity. This paper introduces a new hybrid technique – neuro-fuzzy system dynamics (N-FSD) – by integrating FSD with hybrid neuro-fuzzy systems. In N-FSD, hybrid neuro-fuzzy systems are used to define the non-linear, complex and high-dimensional relationships between the system variables, which improves the accuracy of FSD models in construction applications. The applicability of the N-FSD technique is tested through a construction case study by modeling the production rate of earthmoving operations.
Using the no-signaling condition for constraining the nonidealness of a Stern-Gerlach setup
Creators: name: Home, Dipankar
name: Pan, Alok Kumar
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: On the basis of a variant of the EPR-Bohm example, we show that the no-signaling condition can be employed as a useful tool for deriving a constraint on a suitably defined measure of the `nonidealness' of a Stern-Gerlach(SG) setup. In this demonstration, a key ingredient is provided by the characteristics of the exact solution of the time-dependent Schroedinger equation as applied to a most general SG setup.
The influence of seed origin on Arbutus menziesii survival, health, and performance phenotypes in two British Columbia provenance trials
Creators: name: Puri, Priya Neena Kaur
Publisher: name: University of British Columbia
Year: 2024

description: Arbutus menziesii (arbutus) is an ecologically and culturally important tree species that has been declining throughout the Pacific Northwest for over 50 years. Arbutus faces a complex decline and potentially cumulative set of interacting abiotic and biotic factors which appear to compromise growth. For example, climate change, urban and conifer encroachment, and fire suppression may predispose arbutus to stress incited by drought to exacerbate the incidence and severity of disease. In addition, at least 20 pathogens are known to infect arbutus, many of which take advantage of host stress, but disease resistance remains poorly understood under a changing climate. Past studies have yet to pinpoint a causal agent of arbutus decline; therefore, I sought to address this issue by evaluating arbutus as a host and identifying arbutus provenances potentially displaying high survival, health, and performance. Specifically, I tested the effect of provenance geographic origin and climate on the variation of arbutus phenotypes measured in two British Columbia provenance trials (Holt Creek and Texada Island) using linear and generalized linear mixed-effects models. My objectives were to (1) determine if there are locally-adapted and/or maladapted provenances, (2) determine the effect of provenance (latitude, longitude, elevation) and climate (MAT, MAP, MSP, TD, SHM, FFP) on survival, dieback, blight incidence, and height, and (3) identify candidate provenances displaying high relative survival and adaptive traits of health and performance for assisted gene flow throughout the natural range of arbutus. For both trials, latitude, elevation, MAT, MAP, MSP, and SHM consistently influenced survival, dieback, blight incidence, and height, implying that latitude, temperature, precipitation, and their interactions influence fitness in arbutus. Provenances from BC and CA were least well-adapted to the Holt Creek trial site. BC provenances performed better on Texada Island, but provenances from WA and OR generally outperformed those from BC. These results coincide with latitudinal shifts in climate and fitness for several species of temperate trees, and they emphasize the importance of climate- and disease resistance-based seed source selection for mitigating arbutus decline throughout the Pacific Northwest.
Low-Latency Online Multiplier with Reduced Activities and Minimized Interconnect for Inner Product Arrays
Creators: name: Usman, Muhammad
name: Ercegovac, Milos
name: Lee, Jeong-A
Publisher: name: arXiv
Year: 2023
Subjects: subject: Hardware Architecture (cs.AR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Multiplication is indispensable and is one of the core operations in many modern applications including signal processing and neural networks. Conventional right-to-left (RL) multiplier extensively contributes to the power consumption, area utilization and critical path delay in such applications. This paper proposes a low latency multiplier based on online or left-to-right (LR) arithmetic which can increase throughput and reduce latency by digit-level pipelining. Online arithmetic enables overlapping successive operations regardless of data dependency because of the most significant digit first mode of operation. To produce most significant digit first, it uses redundant number system and we can have a carry-free addition, therefore, the delay of the arithmetic operation is independent of operand bit width. The operations are performed digit by digit serially from left to right which allows gradual increase in the slice activities making it suitable for implementation on reconfigurable devices. Serial nature of the online algorithm and gradual increment/decrement of active slices minimize the interconnects and signal activities resulting in overall reduction of area and power consumption. We present online multipliers with; both inputs in serial, and one in serial and one in parallel. Pipelined and non-pipelined designs of the proposed multipliers have been synthesized with GSCL 45nm technology on Synopsys Design Compiler. Thorough comparative analysis has been performed using widely used performance metrics. The results show that the proposed online multipliers outperform the RL multipliers.
The dangers of deprojection of proper motions
Creators: name: McMillan, Paul J.
name: Binney, James J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We re-examine the method of deprojection of proper motions, which has been used for finding the velocity ellipsoid of stars in the nearby Galaxy. This method is only legitimate if the lines of sight to the individual stars are uncorrelated with the stars' velocities. Very simple models are used to show that spurious results similar to ones recently reported are obtained when velocity dispersion decreases with galactocentric radius in the expected way. A scheme that compensates for this bias is proposed.
description: 5 pages, 5 figures (3 colour), MNRAS submitted
A Two-Step Rule for Backpropagation
Creators: name: Boughammoura, Ahmed
Publisher: name: arXiv
Year: 2023
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: We present a simplified computational rule for the back-propagation formulas for artificial neural networks. In this work, we provide a generic two-step rule for the back-propagation algorithm in matrix notation. Moreover, this rule incorporates both the forward and backward phases of the computations involved in the learning process. Specifically, this recursive computing rule permits the propagation of the changes to all synaptic weights in the network, layer by layer, efficiently. In particular, we use this rule to compute both the up and down partial derivatives of the cost function of all the connections feeding into the output layer.
Interplay between charge-order, ferroelectricity and ferroelasticity: tungsten bronze structures as a playground for multiferroicity
Creators: name: Yamauchi, Kunihiko
name: Picozzi, Silvia
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Large electron-electron Coulomb-interactions in correlated systems can lead to a periodic arrangement of localized electrons, the so called "charge-order". The latter is here proposed as a driving force behind ferroelectricity in iron fluoride K0.6FeF3. By means of density functional theory, we propose different non-centrosymmetric d5/d6 charge-ordering patterns, each giving rise to polarization along different crystallographic axes and with different magnitudes. Accordingly, we introduce the concept of "ferroelectric anistropy" (peculiar to improper ferroelectrics with polarization induced by electronic degrees of freedom), denoting the small energy difference between competing charge-ordered states that might be stabilized upon electrical field-cooling. Moreover, we suggest a novel type of charge-order-induced ferroelasticity: first-principles simulations predict a monoclinic distortion to be driven by a specific charge-ordering pattern, which, in turn, unambiguously determines the direction of ferroelectric polarization. K0.6FeF3 therefore emerges as a prototypical compound, in which the intimately coupled electronic and structural degrees of freedom result in a manifest and peculiar multiferroicity.
description: 4 pages, 4 figures, Submitted for publication
First-principles Prediction of Potential Candidate Materials MCu$_3$X$_4$ (M = V, Nb, Ta; X = S, Se, Te) for Neuromorphic Computing
Creators: name: Zhai, Baoxing
name: Cheng, Ruiqing
name: Wang, Tianxing
name: Liu, Li
name: Yin, Lei
name: Wen, Yao
name: Wang, Hao
name: Chang, Sheng
name: He, Jun
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Inspired by the neuro-synaptic frameworks in the human brain, neuromorphic computing is expected to overcome the bottleneck of traditional von-Neumann architecture and be used in artificial intelligence. Here, we predict a class of potential candidate materials, MCu$_3$X$_4$ (M = V, Nb, Ta; X = S, Se, Te), for neuromorphic computing applications through first-principles calculations based on density functional theory. We find that when MCu$_3$X$_4$ are inserted with Li atom, the systems would transform from semiconductors to metals due to the considerable electron filling [~0.8 electrons per formula unit (f.u.)] and still maintain well structural stability. Meanwhile, the inserted Li atom also has a low diffusion barrier (~0.6 eV/f.u.), which ensures the feasibility to control the insertion/extraction of Li by gate voltage. These results establish that the system can achieve the reversible switching between two stable memory states, i.e., high/low resistance state, indicating that it could potentially be used to design synaptic transistor to enable neuromorphic computing. Our work provides inspiration for advancing the search of candidate materials related to neuromorphic computing from the perspective of theoretical calculations.
description: 28+8 pages, 18 figures
Comprehensive studies on the universality of BKT transitions -- Machine-learning study, Monte Carlo simulation, and Level-spectroscopy method
Creators: name: Otsuka, Hiromi
name: Shiina, Kenta
name: Okabe, Yutaka
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Comprehensive studies are made on the six-state clock universality of two models using several approaches. We apply the machine-learning technique of phase classification to the antiferromagnetic (AF) three-state Potts model on the square lattice with ferromagnetic next-nearest-neighbor (NNN) coupling and the triangular AF Ising model with anisotropic NNN coupling to study two Berezinskii-Kosterlitz-Thouless transitions. We also use the Monte Carlo simulation paying attention to the ratio of correlation functions of different distances for these two models. The obtained results are compared with those of the previous studies using the level-spectroscopy method. We directly show the six-state clock universality for totally different systems with the machine-learning study.
description: 18 pages, 27 figures
Analog control of open quantum systems under arbitrary decoherence
Creators: name: Clausen, Jens
name: Bensky, Guy
name: Kurizki, Gershon
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive and investigate a general non-Markovian equation for the time-dependence of a Hamiltonian that maximizes the fidelity of a desired quantum gate on any finite-dimensional quantum system in the presence of arbitrary bath and noise sources. The method is illustrated for a single-qubit gate implemented on a three-level system.
description: 8 pages, including 4 figures and an appendix
Universal thermodynamic topological classes of black holes in perfect fluid dark matter background
Creators: name: Rizwan, Muhammad
name: Jamil, Mubasher
name: Moughal, M. Z. A.
Publisher: name: arXiv
Year: 2025
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we study the universal thermodynamic topological classes of a family of black holes in a perfect fluid dark matter (PFDM) background. Recent research on black hole thermodynamics suggests that all black holes can be classified into four universal thermodynamic classes, denoted by $W^{1-}$, $W^{0+}$, $W^{0-}$, and $W^{1+}$. Our study reveals that the Schwarzschild black hole in PFDM belongs to the $W^{1-}$ class, and independence of black hole size thermodynamically unstable at both low- and high-temperature limits. The Reissner-Nordström, Kerr, and Kerr-Newman black holes in the PFDM background belong to the same universal thermodynamic class, $W^{0+}$, which represents small, stable black holes and large, unstable black holes at low-temperature limits, whereas no black hole state exists at high temperatures. The AdS black holes behave differently compared to their counterparts in PFDM. The Schwarzschild-AdS black hole belongs to the $W^{0-}$ class, indicating no black hole state at low temperatures, but small, unstable and large, stable black hole states at high temperatures. Furthermore, the Kerr-AdS black hole belongs to the $W^{1+}$ class, characterized by small, stable black holes at low temperatures, large, stable black holes at high temperatures, and unstable, intermediate-sized black holes at both low and high temperatures. These findings uncover the universal topological classifications underlying black hole thermodynamics, offering profound insights into the fundamental principles of quantum gravity.
description: 10 pages, 11 figures, minor revision, accepted for publication in Eur. Phys. J. C
Fundamental Imaging Limits of Radio Telescope Arrays
Creators: name: Wijnholds, Stefan J.
name: van der Veen, Alle-Jan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Applications (stat.AP)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The fidelity of radio astronomical images is generally assessed by practical experience, i.e. using rules of thumb, although some aspects and cases have been treated rigorously. In this paper we present a mathematical framework capable of describing the fundamental limits of radio astronomical imaging problems. Although the data model assumes a single snapshot observation, i.e. variations in time and frequency are not considered, this framework is sufficiently general to allow extension to synthesis observations. Using tools from statistical signal processing and linear algebra, we discuss the tractability of the imaging and deconvolution problem, the redistribution of noise in the map by the imaging and deconvolution process, the covariance of the image values due to propagation of calibration errors and thermal noise and the upper limit on the number of sources tractable by self calibration. The combination of covariance of the image values and the number of tractable sources determines the effective noise floor achievable in the imaging process. The effective noise provides a better figure of merit than dynamic range since it includes the spatial variations of the noise. Our results provide handles for improving the imaging performance by design of the array.
description: 12 pages, 8 figures
Gamma-Rays from Positron Annihilation
Creators: name: Diehl, Roland
name: Leising, Mark
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: SPI on INTEGRAL has provided spectra and a map of the sky in the emission from annihilations of positrons in the interstellar medium of our Galaxy. From high-resolution spectra we learned that a warm, partially-ionized medium is the site where the observed gamma-rays originate. The gamma-ray emission map shows a major puzzle for broader astrophysics topics, as it is dominated by a bright and extended apparently spherical emission region centered in the Galaxy's center. Only recently has the disk of the Galaxy been detected with SPI. This may be regarded as confirmation of earlier expectations that positrons should arise predominantly from sources of nucleosynthesis distributed throughout the plane of the Galaxy, which produce proton-rich unstable isotopes. But there are other plausible sources of positrons, among them pulsars and accreting binaries such as microquasars. SPI results may be interpreted also as hints that these are more significant as positron sources on the Galactic scale than thought before, in the plane and therefore also in the bulge of the Galaxy. This is part of the attempt to understand the surprisingly-bright emission from the central region in the Galaxy, which otherwise also could be interpreted as a first rather direct detection of dark matter annihilations in the Galaxy's gravitational well. INTEGRAL has a unique potential to shed light on the various aspects of positron astrophysics, through its capability for imaging spectroscopy.
description: 17 pages; invited contribution to 7th INTEGRAL Science Workshop, Sep 2008; accepted for publication in Proceedings of Science; V2 for ref 47 update
Obtaining Depth Maps From Color Images By Region Based Stereo Matching Algorithms
Creators: name: Alagoz, B. Baykant
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In the paper, region based stereo matching algorithms are developed for extraction depth information from two color stereo image pair. A filter eliminating unreliable disparity estimation was used for increasing reliability of the disparity map. Obtained results by algorithms were represented and compared.
description: New figures were added
Double-periodic maximal surfaces with singularities
Creators: name: Sergienko, Vladimir V.
name: Tkachev, Vladimir G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 53C42; 49Q05

description: We construct and study a family of double-periodic almost entire solutions of the maximal surface equation. The solutions are parameterized by a submanifold of $3\times 3$-matrices (the so-called generating matrices). We show that the constructed solutions are either space-like or of mixed type with the light-cone type isolated singularities.
description: An full version in English of "Doubly periodic maximal surfaces with singularities" (in Russian). Proceedings on Analysis and Geometry, 571-584, Izdat. Ross. Akad. Nauk Sib. Otd. Inst. Mat., Novosibirsk, 2000
Noah's Flood and the Associated Tremendous Rainfall as a Possible Result of Collision of a Big Asteroid with the Sun
Creators: name: Shopov, Y. Y.
name: Tsankov, L. T.
name: Georgiev, L. N.
name: Damyanov, Y.
name: Damyanova, A.
name: Ford, D. C.
name: Yonge, C. J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: A good correlation between the growth rate of the cave speleothems and the annual precipitation at the cave site allow quantitative reconstruction of the precipitation. Measuring the growth rate of a speleothem from Duhlata Cave, Bulgaria we found that around 7500 B.P. the speleothem growth rate (averaged for 120 years) exceeds 53 times its recent value suggesting that enormous precipitation flooded the Black Sea basin at that time. Its possible connection with the Bible (Noahs) Flood is discussed. We propose a possible mechanism of the flooding of the Black Sea during the Flood involving production of a super- Tsunami by pushing of the Black Sea water towards the Crimea cost by Mediterranean waters. We propose also an Astronomical Theory of the origin of the Bible Flood. We attribute higher water evaporation and rainfall to be caused by rapid increasing of the solar radiation resulting from a collision of a large asteroid or comet with the Sun.
QUALITY ASSESSMENT OF GEDI ELEVATION DATA
Creators: name: Firdaus, Wildan
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: classificationCode: 370403
subject: Geoscience data visualisation
classificationCode: 370402
subject: Earth and space science informatics
classificationCode: 401302
subject: Geospatial information systems and geospatial data modelling
classificationCode: 401306
subject: Surveying (incl. hydrographic surveying)

description: As a new spaceborne laser remote sensing system, the Global Ecosystem Dynamics Investigation, or GEDI, is being widely used for monitoring forest ecosystems. However, its measurements are subject to uncertainties that will affect the calculation of ground elevation and vegetation height. This research intends to investigate the quality of the GEDI elevation data and its relevance to topography and land cover.In this study, the elevation of the GEDI data is compared to 3DEP DEM, which has a higher resolution and accuracy. All the experiments in this study are conducted for two locations with vastly different terrain and land cover conditions, namely Tippecanoe County in Indiana and Mendocino County in California. Through this investigation we expect to gain a comprehensive understanding of GEDI’s elevation quality in various terrain and land cover conditions.The results show that GEDI data in Tippecanoe County has better elevation accuracy than the GEDI data in Mendocino County. GEDI in Tippecanoe County is almost four times more accurate than in Mendocino County. Regarding land cover, GEDI have better accuracy in low vegetation areas than in forest areas. The ratio can be around three times better in Tippecanoe County and around one and half times better in Mendocino County. In terms of slope, GEDI data shows a clear positive correlation between RMSE and slope. The trend indicates as slope increases, the RMSE increases concurrently. In other words, slope and GEDI elevation accuracy are inversely related. In the experiment involving slope and land cover, the results show that slope is the most influential factor to GEDI elevation accuracy.This study informs GEDI users of the factors they must consider for forest biomass calculation and topographic mapping applications. When high terrain slope and/or high vegetation is present, the GEDI data should be checked with other data sources like 3DEP DEM or any ground truth measurements to assure its quality. We expect these findings can help worldwide users understand that the quality of GEDI data is variable and dependent on terrain relief and land cover.
Spin dynamics in the geometrically frustrated multiferroic CuCrO2
Creators: name: Poienar, M.
name: Damay, F.
name: Martin, C.
name: Robert, J.
name: Petit, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The spin dynamics of the geometrically frustrated triangular antiferromagnet multiferroic CuCrO2 have been mapped out using inelastic neutron scattering. The relevant spin Hamiltonian parameters modelling the incommensurate modulated helicoid have been determined, and correspond to antiferromagnetic nearest and next-nearest neighbour interactions in the ab plane, with a strong planar anisotropy. The weakly dispersive excitation along c reflects the essentially two-dimensional character of the magnetic interactions and according to classical energy calculations it is weakly ferromagnetic. Our results clearly point out the relevance of the balance between a ferromagnetic coupling between adjacent planes and a weakly antiferromagnetic next-nearest neighbour interaction in stabilising the three-dimensional ferroelectric magnetic order in CuCrO2. This novel insight on the interplay between magnetic interactions in CuCrO2 should provide a useful basis in the design of new delafossite-based multiferroic materials.
A machine learning approach to overdose risk assessment
Creators: name: Tai, Man Yeung (Andy)
Publisher: name: University of British Columbia
Year: 2024

description: This project explores the escalating drug toxicity crisis in British Columbia, spotlighting the role of machine learning within eHealth solutions to combat this pressing public health issue. The crisis, rooted in a shift from prescription opioids to potent synthetic alternatives like fentanyl, necessitates innovative intervention strategies. The study leverages extensive data from 2015 to 2019, aiming to develop predictive models for overdoses to improve healthcare responses. The research begins with a systematic review and meta-analysis of machine learning models targeting opioid-related outcomes, demonstrating the predictive strengths of various algorithms in cohort studies. Results indicate these algorithms' effectiveness in forecasting opioid usage and overdose risks. Additionally, a review of clinical decision support systems in addiction and mental health care reveals their critical impact on enhancing diagnosis, treatment, and patient care, based on randomized controlled trials. Central to the thesis is an exploratory data analysis utilizing the British Columbia Provincial Overdose Cohort. This involves rigorous data preparation, including wrangling, addressing missing data, and correcting class imbalances. The study assesses several machine learning models, including ensemble approaches like Random Forest and XGBoost, for their predictive accuracy regarding fatal and general overdoses. Despite challenges, these models demonstrate significant potential, with the best performers achieving over 90% accuracy in predicting general overdoses, though models for fatal overdoses showed lower efficacy. The thesis concludes with an affirmation of machine learning's transformative potential in personalizing addiction psychiatry treatment through eHealth innovations such as the Risk Assessment and Management Platform (RAMP). This novel approach aims to individualize treatment and prevention strategies, contributing to global efforts in mitigating the mental health ramifications of the drug toxicity crisis and transforming healthcare practices. Through the strategic implementation of machine learning, the study underscores a promising avenue for advancing healthcare solutions tailored to the intricacies of addiction and overdose risks, reflecting a significant stride towards mitigating the public health impacts of the drug crisis.
Three Simple Stokeslet Trajectories
Creators: name: Landrum, Benjamin J.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Exact results for three trajectories of small numbers of particles interacting hydrodynamically through Stokeslets are presented. First, the middle particle in a vertical trio of particles sediments at a constant velocity for all time. Second, a horizontal pair of particles sedimenting toward a rigid wall undergo a finite and surprisingly constant horizontal displacement in the limit of large initial separations. Third, a pair of particles sedimenting in a quadratic flow, such as that of a fluid pumped in the direction of gravity, oscillates in a periodic orbit and admits a Hamiltonian formulation.
description: 20 pages, 4 figures
Multi-lepton production at high transverse momentum at HERA
Creators: name: ZEUS Collaboration
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search for events containing two or more high-transverse-momentum isolated leptons has been performed in ep collisions with the ZEUS detector at HERA using the full collected data sample, corresponding to an integrated luminosity of 480 pb^{-1}. The number of observed events has been compared with the prediction from the Standard Model, searching for possible deviations, especially for multi-lepton events with invariant mass larger than 100 GeV. Good agreement with the Standard Model has been observed. Total and differential cross sections for di-lepton production have been measured in a restricted phase space dominated by photon-photon collisions.
description: 18 pages, 5 figures. v2: revised version for journal publication
MPEC 2023-X269 : COMET P/2023 X3 (PANSTARRS)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: COMET P/2023 X3 (PANSTARRS)

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
ATLASGAL - The APEX Telescope Large Area Survey of the Galaxy at 870 microns
Creators: name: Schuller, F.
name: Menten, K. M.
name: Contreras, Y.
name: Wyrowski, F.
name: Schilke, P.
name: Bronfman, L.
name: Henning, T.
name: Walmsley, C. M.
name: Beuther, H.
name: Bontemps, S.
name: Cesaroni, R.
name: Deharveng, L.
name: Garay, G.
name: Herpin, F.
name: Lefloch, B.
name: Linz, H.
name: Mardones, D.
name: Minier, V.
name: Molinari, S.
name: Motte, F.
name: Nyman, L. -A.
name: Reveret, V.
name: Risacher, C.
name: Russeil, D.
name: Schneider, N.
name: Testi, L.
name: Troost, T.
name: Vasyunina, T.
name: Wienen, M.
name: Zavagno, A.
name: Kovacs, A.
name: Kreysa, E.
name: Siringo, G.
name: Weiss, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: (Abridged) Studying continuum emission from interstellar dust is essential to locating and characterizing the highest density regions in the interstellar medium. In particular, the early stages of massive star formation remain poorly understood. Our goal is to produce a large-scale, systematic database of massive pre- and proto-stellar clumps in the Galaxy, to understand how and under what conditions star formation takes place. A well characterized sample of star-forming sites will deliver an evolutionary sequence and a mass function of high-mass, star-forming clumps. This systematic survey at submm wavelengths also represents a preparatory work for Herschel and ALMA. The APEX telescope is ideally located to observe the inner Milky Way. The Large APEX Bolometer Camera (LABOCA) is a 295-element bolometer array observing at 870 microns, with a beam size of 19". Taking advantage of its large field of view (11.4') and excellent sensitivity, we started an unbiased survey of the Galactic Plane, with a noise level of 50-70 mJy/beam: the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL). As a first step, we covered 95 sq. deg. These data reveal 6000 compact sources brighter than 0.25 Jy, as well as extended structures, many of them filamentary. About two thirds of the compact sources have no bright infrared counterpart, and some of them are likely to correspond to the precursors of (high-mass) proto-stars or proto-clusters. Other compact sources harbor hot cores, compact HII regions or young embedded clusters. Assuming a typical distance of 5 kpc, most sources are clumps smaller than 1 pc with masses from a few 10 to a few 100 M_sun. In this introductory paper, we show preliminary results from these ongoing observations, and discuss the perspectives of the survey.
description: Accepted for publication in A&A, 13 pages, 14 figures. Final version after language editing
Longitudinal associations between socioeconomic status, neural sensitivity to reward, cultural protective factors, and depression symptoms in Mexican-origin adolescents
Creators: name: Hastings, Paul
name: Guyer, Amanda
name: Swartz, Johnna
name: Carranza, Angelica
name: McMillan, Sarah
name: Robins, Richard
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Life Sciences
subject: Neuroscience and Neurobiology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: The present study examines (1) how SES is associated with depression symptoms, (2) whether reward-related neural activity mediates this association, and (3) how cultural factors (ethnic pride and familism) moderate associations between SES and reward-related neural activity, and between reward-related neural activity and depression symptoms, using data from a sample of Mexican-origin youth followed from adolescence to early adulthood.
Quantum cosmological Friedman models with a massive Yang-Mills field
Creators: name: Gerhardt, Claus
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We prove the existence of a spectral resolution of the Wheeler-DeWitt equation when the matter field is provided by a massive Yang-Mills field. The resolution is achieved by first solving the free eigenvalue problem for the gravitational field and then the constrained eigenvalue problem for the Yang-Mills field. In the latter case the mass of the Yang-Mills field assumes the role of the eigenvalue.
description: 16 pages, v3: typos corrected, final version, to appear in CQG
New solutions of Heun general equation
Creators: name: Ishkhanyan, Artur
name: Suominen, Kalle-Antti
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We show that in four particular cases the derivative of the solution of Heun general equation can be expressed in terms of a solution to another Heun equation. Starting from this property, we use the Gauss hypergeometric functions to construct series solutions to Heun equation for the mentioned cases. Each of the hypergeometric functions involved has correct singular behavior at only one of the singular points of the equation; the sum, however, has correct behavior.
Real-frequency TPSC+DMFT investigation of the square-lattice Hubbard model
Creators: name: Geng, Lei
name: Yan, Jiawei
name: Werner, Philipp
Publisher: name: arXiv
Year: 2025
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the two-dimensional Hubbard model using a real-frequency implementation of the TPSC+DMFT approach. This hybrid method combines the nonlocal correlations captured by the Two-Particle Self-Consistent (TPSC) approach with the local dynamical correlations of Dynamical Mean-Field Theory (DMFT). The results demonstrate that TPSC+DMFT effectively describes pseudogap physics and nonlocal fluctuations in the moderately correlated regime, while also reproducing the Mott insulating state at larger interaction strengths. For doped Mott insulators, we find that TPSC+DMFT captures the evolution of Fermi pockets into Fermi arcs, consistent with the results from cluster DMFT and photoemission studies. These findings highlight the capability of TPSC+DMFT to bridge the gap between weak and strong coupling physics in Hubbard models, providing insights into spin and charge fluctuations, as well as their role in the pseudogap formation.
15μm Quantum well infrared photodetector for thermometric imagery in cryogenic windtunnel
Creators: name: Lhuillier, Emmanuel
name: Ribet-Mohamed, Isabelle
name: Péré-Laperne, Nicolas
name: Tauvy, Michel
name: Deschamps, Joël
name: Nedelcu, Alexandu
name: Rosencher, Emmanuel
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Quantum Well Infrared Photodetector (QWIP) usually suffer from a too moderate quantum efficiency and too large dark current which is often announced as crippling for low flux applications. Despite this reputation we demonstrate the ability of QWIP for the low infrared photon flux detection. We present the characterization of a state of the art 14.5μm QWIP from Alcatel-Thales 3-5 Lab. We developed a predictive model of the performance of an infrared instrument for a given application. The considered scene is a Cryogenic Wind Tunnel (ETW), where a specific Si:Ga camera is currently used. Using this simulation tool we demonstrate the QWIP ability to image a low temperature scene in this scenario. QWIP detector is able to operate at 30K with a NETD as low as 130mK. In comparison to the current detector, the temperature of use is three times higher and the use of a QWIP based camera would allow a huge simplification of the optical part.
title: Μελέτη Συντήρησης Υπαίθριου Μαρμάρινου Γλυπτού με τίτλο «Λαγωνικό σκυλί»
title: Conservation Study of Outdoor Marble Sculpture titled “Beagle Dog”
titleType: AlternativeTitle
Creators: name: Καβαλλιεράτου, Αικατερίνη
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Μαρμάρινο Γλυπτό

description: Στην παρούσα πτυχιακή εργασία καταγράφονται τα ιστορικά στοιχεία, η κατάσταση διατήρησης, η μελέτη συντήρησης, οι εργασίες συντήρησης και η εκτίμηση των αποτελεσμάτων αυτών που πραγματοποιήθηκαν στο υπαίθριο γλυπτό με τίτλο «Λαγωνικό σκυλί» του γλύπτη Ευριπίδη Βαβούρη, το οποίο εκτίθεται στη Φωκίωνος Νέγρη 48, στον Κεντρικό Τομέα Αθηνών. Επιπρόσθετα καταγράφεται η μέση διακύμανση των κλιματικών συνθηκών του Κεντρικού Τομέα Αθηνών, τα δεδομένα της ατμοσφαιρικής ρύπανσης που παρέχει το Υπουργείο Περιβάλλοντος και Υγείας καθώς και άλλοι παράγοντες φθοράς των λίθων όπως ο ανθρώπινος παράγοντας και η αστική πανίδα. Το γλυπτό αναπαριστά κυνηγητικό σκύλο σε καθήμενη στάση, σε φυσικό μέγεθος και κατασκευάστηκε και εκτέθηκε το 1940. Το υλικό κατασκευής του γλυπτού και της βάσης του είναι το λευκό μάρμαρο.
Por una arqueología en lucha. Reflexiones en torno al papel de la arqueología en la sociedad
Creators: name: Busto Zapico, Miguel
name: Carrero Pazos, Miguel
Publisher: name: Zenodo
Year: 2021
Subjects: Arqueología
Archaeology
Sociedad

description: Busto Zapico, M., & Carrero Pazos, M. (2013). Por una arqueología en lucha. Reflexiones en torno al papel de la Arqueología en la sociedad. En G. Compañy, J. Fonte, B. Gómez-Arribas, L. Moragón Martínez, & J. M. Señorán Martín (Eds.), Arqueología para el siglo XXI: Actas de las V Jornadas de Jóvenes en Investigación Arqueológica (pp. 280-285). Madrid: JAS Arqueología. En esta pequeña aportación hablamos de la influencia de la arqueología en la sociedad actual y la influencia que esta sociedad juega para la arqueología. Proponemos esta comunicación de tipo más reflexivo y personal porque consideramos que puede ser interesante ofrecer en un congreso de jóvenes investigadores un debate siempre presente, pero inconcluso.
 Giraremos en torno a conceptos como los de sociedad, arqueología, postmodernismo o difusión; intentando dilucidar cuáles son sus redes de influencia recíprocas.
 Dicha reciprocidad ya viene dada desde la propia creación de nuestra disciplina, puesto que es la sociedad la que crea la arqueología. Ésta, en consecuencia, adquiere sentido para la propia sociedad porque es una de las herramientas o medios que utiliza para ver su pasado. Al mismo tiempo, busca en las sociedades pasadas una justificación para su existencia, utilizando para ello a la arqueología como una de sus herramientas principales. Así, podemos decir que pasado y presente aparecen unidos a través de una arqueología.
 Por otra parte, en el ámbito actual la arqueología ha pasado a ser un mero objeto que se mercantiliza, que se tiene que rentabilizar a toda costa. Lo cultural se tiene que transformar necesariamente en una mercancía de consumo. ¿Nos conformaremos con eso?
Flipped Classroom and Learning Analytics in Higher Education: Effective Development, Integration, and Learner Support
Creators: name: Rodda, Alena
Publisher: name: Universität Osnabrück
Year: 2023
Subjects: subject: Flipped Classroom
subject: Learning Analytics
subject: Higher Education
subject: e-Learning
subject: 650 - Management
subject: 06.35 - Informationsmanagement
subject: H.0 - GENERAL

description: This dissertation investigates the transformation of higher education in response to evolving workforce demands. As universities globally transition to diverse teaching formats, the integration of Flipped Classroom (FC) courses and the utilization of Learning Analytics (LA) take center stage. The FC approach, emphasizing interactive in-class sessions and pre-class self-learning phases, offers opportunities for skill development aligned with changing workforce needs. Challenges in FC design, however, persist. Learning Analytics emerges as a solution to enhance self-regulated learning skills through data collection and analysis. The dissertation aims to systematically develop and integrate FCs into higher education operations, proposing a process model, and explores the potential of LA to optimize FC courses. The research contributes insights, implications, and avenues for further exploration in the dynamic landscape of contemporary education.
Actions of the derived group of a maximal unipotent subgroup on $G$-varieties
Creators: name: Panyushev, Dmitri I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14L30

description: Let $U$ be a maximal unipotent subgroup of a connected semisimple group $G$ and $U'$ the derived group of $U$. We study actions of $U'$ on affine $G$-varieties. First, we consider the algebra of $U'$ invariants on $G/U$. We prove that $k[G/U]^{U'}$ is a polynomial algebra of Krull dimension $2r$, where $r=rk(G)$. A related result is that, for any simple finite-dimensional $G$-module $V$, $V^{U'}$ is a cyclic $U/U'$-module. Second, we study "symmetries" of Poincare series for $U'$-invariants on affine conical $G$-varieties. Third, we obtain a classification of simple $G$-modules $V$ with polynomial algebras of $U'$-invariants (for $G$ simple).
description: 23 pages