cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Post-Paleozoic Trends in the Abundance of Benthic Marine Organisms: Increasing Skeletal Abundance in Shallow-Marine Environments over the past 250 million years
Creators: name: Ferré, Jordan
name: Singh, Pulkit
name: Payne, Jonathan
Publisher: name: Stanford Digital Repository
Year: 2024
Subjects: School of Earth Energy & Environmental Science, Paleoecology, Post-Paleozoic, Marine Abundance

description: Variations in skeletal abundance through geological history, when combined with organismal body size, can provide a much-improved quantification of 
animal abundance in marine environments, an important control on energy and nutrient flow through such systems. Increases in abundance have long been hypothesized to explain the increase in taxonomic diversity and mean animal body size in marine communities during the post-Paleozoic (252 Mya - Present) but total biomass has remained more poorly constrained than taxonomic diversity and body size due to the challenge of collecting relevant data. For this study, the abundance of skeletal fossils in marine limestones from the earliest Triassic through the Neogene (252 - 0 Mya) was evaluated in order to more directly quantify the absolute abundance of skeletal animals, algae, and foraminifera in marine carbonate environments. Absolute abundance data were collected from thirteen previously published papers reporting point count data for 1596 rock samples totaling to around 400,000 individual points. These data were recorded along with the geologic age, depositional environment, and standardized at the phylum and class level. An increase in the abundance of calcifying organisms across the post-Paleozoic was found, with the exception of a short-term decline following a major mass extinction event at the end of the Triassic period (201 Mya). These findings support the hypothesis that the abundance of marine biota has increased since the start of the Mesozoic, suggesting that increased trophic resources were at least one factor enabling the increases in taxonomic diversity. These and similar findings also have implications for modern conservation efforts. Conservationists can use these data as a deep-time baseline against which to compare changes in abundances within modern marine environments to identify ecosystems most in need of protection.
Twin "Fano-Snowflakes" Over the Smallest Ring of Ternions
Creators: name: Saniga, Metod
name: Havlicek, Hans
name: Planat, Michel
name: Pracna, Petr
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Given a finite associative ring with unity, $R$, any free (left) cyclic submodule (FCS) generated by a $uni$modular ($n+1$)-tuple of elements of $R$ represents a point of the $n$-dimensional projective space over $R$. Suppose that $R$ also features FCSs generated by ($n+1$)-tuples that are $not$ unimodular: what kind of geometry can be ascribed to such FCSs? Here, we (partially) answer this question for $n=2$ when $R$ is the (unique) non-commutative ring of order eight. The corresponding geometry is dubbed a "Fano-Snowflake" due to its diagrammatic appearance and the fact that it contains the Fano plane in its center. There exist, in fact, two such configurations -- each being tied to either of the two maximal ideals of the ring -- which have the Fano plane in common and can, therefore, be viewed as twins. Potential relevance of these noteworthy configurations to quantum information theory and stringy black holes is also outlined.
description: 6 pages, 1 table, 1 figure; v2 -- standard representation of the ring of ternions given, 1 figure and 3 references added; v3 -- published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Deterministic distribution of multipartite entanglement and steering in a quantum network by separable states
Creators: name: Wang, Meihong
name: Xiang, Yu
name: Kang, Haijun
name: Han, Dongmei
name: Liu, Yang
name: He, Qiongyi
name: Gong, Qihuang
name: Su, Xiaolong
name: Peng, Kunchi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: As two valuable quantum resources, Einstein-Podolsky-Rosen entanglement and steering play important roles in quantum-enhanced communication protocols. Distributing such quantum resources among multiple remote users in a network is a crucial precondition underlying various quantum tasks. We experimentally demonstrate the deterministic distribution of two- and three-mode Gaussian entanglement and steering by transmitting separable states in a network consisting of a quantum server and multiple users. In our experiment, entangled states are not prepared solely by the quantum server, but are created among independent users during the distribution process. More specifically, the quantum server prepares separable squeezed states and applies classical displacements on them before spreading out, and users simply perform local beam-splitter operations and homodyne measurements after they receive separable states. We show that the distributed Gaussian entanglement and steerability are robust against channel loss. Furthermore, one-way Gaussian steering is achieved among users that is useful for further directional or highly asymmetric quantum information processing.
Nonlinear Dynamical Model of Regime Switching Between Conventions and Business Cycles
Creators: name: Yukalov, V. I.
name: Sornette, D.
name: Yukalova, E. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: General Finance (q-fin.GN)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: We introduce and study a non-equilibrium continuous-time dynamical model of the price of a single asset traded by a population of heterogeneous interacting agents in the presence of uncertainty and regulatory constraints. The model takes into account (i) the price formation delay between decision and investment by the second-order nature of the dynamical equations, (ii) the linear and nonlinear mean-reversal or their contrarian in the form of speculative price trading, (iii) market friction, (iv) uncertainty in the fundamental value which controls the amplitude of mispricing, (v) nonlinear speculative momentum effects and (vi) market regulations that may limit large mispricing drifts. We find markets with coexisting equilibrium, conventions and business cycles, which depend on (a) the relative strength of value-investing versus momentum-investing, (b) the level of uncertainty on the fundamental value and (c) the degree of market regulation. The stochastic dynamics is characterized by nonlinear geometric random walk-like processes with spontaneous regime shifts between different conventions or business cycles. This model provides a natural dynamical framework to model regime shifts between different market phases that may result from the interplay between the effects (i-vi).
description: Latex file, 25 figures
Lorentz symmetry from Lorentz violation in the bulk
Creators: name: Bertolami, Orfeu
name: Carvalho, Carla
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the mechanism of spontaneous symmetry breaking of a bulk vector field to study signatures of bulk dimensions invisible to the standard model confined to the brane. By assigning a non-vanishing vacuum expectation value to the vector field, a direction is singled out in the bulk vacuum, thus breaking the bulk Lorentz symmetry. We present the condition for induced Lorentz symmetry on the brane, as phenomenologically required, noting that it is related to the value of the observed cosmological constant.
description: Talk presented by one of us (OB) at the 11th Marcel Grossmann Meeting , 23-29 July 2006, Berlin, Germany. 4 pages plus Macros
Non-universality of hydrodynamics
Creators: name: Jain, Akash
name: Kovtun, Pavel
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We investigate the effects of stochastic interactions on hydrodynamic correlation functions using the Schwinger-Keldysh effective field theory. We identify new "stochastic transport coefficients" that are invisible in the classical constitutive relations, but nonetheless affect the late-time behaviour of hydrodynamic correlation functions through loop corrections. These results indicate that classical transport coefficients do not provide a universal characterisation of long-distance, late-time correlations even within the framework of fluctuating hydrodynamics.
description: 5 pages + Supplementary Material
Accuracy on eigenvalues for a Schrodinger operator with a degenerate potential in the semi-classical limit
Creators: name: Morame, Abderemane
name: Truc, Francoise
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35P20

description: We consider a semi-classical Schrodinger operator with a degenerate potential V(x,y) =f(x) g(y) . g is assumed to be a homogeneous positive function of m variables and f is a strictly positive function of n variables, with a strict minimum. We give sharp asymptotic behaviour of low eigenvalues bounded by some power of the parameter h, by improving Born-Oppenheimer approximation.
Data-Driven Copy-Paste Imputation for Energy Time Series
Creators: name: Weber, Moritz
name: Turowski, Marian
name: Çakmak, Hüseyin K.
name: Mikut, Ralf
name: Kühnapfel, Uwe
name: Hagenmeyer, Veit
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: A cornerstone of the worldwide transition to smart grids are smart meters. Smart meters typically collect and provide energy time series that are vital for various applications, such as grid simulations, fault-detection, load forecasting, load analysis, and load management. Unfortunately, these time series are often characterized by missing values that must be handled before the data can be used. A common approach to handle missing values in time series is imputation. However, existing imputation methods are designed for power time series and do not take into account the total energy of gaps, resulting in jumps or constant shifts when imputing energy time series. In order to overcome these issues, the present paper introduces the new Copy-Paste Imputation (CPI) method for energy time series. The CPI method copies data blocks with similar properties and pastes them into gaps of the time series while preserving the total energy of each gap. The new method is evaluated on a real-world dataset that contains six shares of artificially inserted missing values between 1 and 30%. It outperforms by far the three benchmark imputation methods selected for comparison. The comparison furthermore shows that the CPI method uses matching patterns and preserves the total energy of each gap while requiring only a moderate run-time.
description: 8 pages, 7 figures, submitted to IEEE Transactions on Smart Grid, the first two authors equally contributed to this work
Guided Navigation from Multiple Viewpoints using Qualitative Spatial Reasoning
Creators: name: Perico, Danilo
name: Santos, Paulo E.
name: Bianchi, Reinaldo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Navigation is an essential ability for mobile agents to be completely autonomous and able to perform complex actions. However, the problem of navigation for agents with limited (or no) perception of the world, or devoid of a fully defined motion model, has received little attention from research in AI and Robotics. One way to tackle this problem is to use guided navigation, in which other autonomous agents, endowed with perception, can combine their distinct viewpoints to infer the localisation and the appropriate commands to guide a sensory deprived agent through a particular path. Due to the limited knowledge about the physical and perceptual characteristics of the guided agent, this task should be conducted on a level of abstraction allowing the use of a generic motion model, and high-level commands, that can be applied by any type of autonomous agents, including humans. The main task considered in this work is, given a group of autonomous agents perceiving their common environment with their independent, egocentric and local vision sensors, the development and evaluation of algorithms capable of producing a set of high-level commands (involving qualitative directions: e.g. move left, go straight ahead) capable of guiding a sensory deprived robot to a goal location.
description: 26 pages
Second Order Operators in the NASA Astrophysics Data System
Creators: name: Kurtz, Michael J.
name: Chyla, Roman
Publisher: name: arXiv
Year: 2020
Subjects: subject: Digital Libraries (cs.DL)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Second Order Operators (SOOs) are database functions which form secondary queries based on attributes of the objects returned in an initial query; they can provide powerful methods to investigate complex, multipartite information graphs. The NASA Astrophysics Data System (ADS) has implemented four SOOs, reviews, useful, trending, and similar which use the citations, references, downloads, and abstract text. This tutorial describes these operators in detail, both alone and in conjunction with other functions. It is intended for scientists and others who wish to make fuller use of the ADS database. Basic knowledge of the ADS is assumed.
description: ADS Bibcode:2020BAAS...52b0207K, author's version
Ferroic orders in two-dimensional transition/rare-earth metal halides
Creators: name: An, Ming
name: Dong, Shuai
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Since the discovery of graphene, two-dimensional materials with atomic level thickness have rapidly grown to be a prosperous field of physical science with interdisciplinary interests, for their fascinating properties and broad applications. Very recently, the experimental observation of ferromagnetism in Cr$_2$Ge$_2$Te$_6$ bilayer and CrI$_3$ monolayer opened a door to pursuit long-absent intrinsic magnetic orders in two-dimensional materials. Meanwhile, the ferroelectricity was also experimentally found in SnTe monolayer and CuInP$_2$S$_6$ few layers. The emergence of these ferroic orders in the two-dimensional limit not only brings new challenges to our physical knowledge, but also provides more functionalities for potential applications. Among various two-dimensional ferroic ordered materials, transition/rare-earth metal halides and their derivants are very common. In this Research Update, based on transition/rare-earth metal halides, the physics of various ferroic orders in two-dimensional will be illustrated. The potential applications based on their magnetic and polar properties will also be discussed.
description: 11 pages, 8 figures
Dichtung und Wahrheit in Malapartes "Kaputt"
Creators: name: Knigge, Jobst C.
Publisher: name: Zenodo
Year: 2024
Subjects: Malaparte, Kaputt, Second World War, Corriere della Sera, Jassy, Hans Frank

description: The book "Kaputt" by Italian author Curzio Malaparte is an interesting literary phenomenon. It is no novel, and it is no factual report. In the center we find the writer himself in an apocalyptical travel through the horrors on the eastern front of the Second World War. Malaparte, who was a war correspondent of the Italian newspaper "Corriere della Sera", wants us to believe that everything happened as he describes it. In this study his presentation of persons, sights and events is compared with the reality shown in the documented history. The outcome: Much is the result of exaggeration and the outflow of his flowering imaginantion.
Προσωρινή απασχόληση
Creators: name: Κυνηγοπούλου, Σταματία Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ατυπικές μορφές απασχόλησης
Προσωρινή απασχόληση
Διάκριση από συναφείς συμβάσεις
Nonstandard Work
Temporary agency work
Distinction from similar contractual relationships

description: Σκοπός της μεταπτυχιακής διπλωματική εργασίας ήταν η μελέτη της προσωρινής απασχόλησης, ενός θεσμού που εντάσσεται στην κατηγορία των ατυπικών μορφών απασχόλησης. Στην πρώτη ενότητα αναλύσαμε τη νομοθετική ρύθμιση της προσωρινής απασχόλησης και τα εννοιολογικά της στοιχεία, ενώ έγινε αναφορά και στα τρία εμπλεκόμενα πρόσωπα. Στη συνέχεια παρουσιάσαμε αναλυτικά τη νομική φύση των δύο συμβάσεων που συνάπτονται στα πλαίσιά της, δηλ. της σύμβασης προσωρινής απασχόλησης και της σύμβασης παραχώρησης εργαζομένου, και έγινε μία σύντομη αναφορά στα πλεονεκτήματα και στα μειονεκτήματα της. Κατόπιν, διακρίναμε την προσωρινή απασχόληση από τον απλό δανεισμό εργαζομένου, τη μεσολάβηση για εύρεση εργασίας, τη σύμβαση έργου και τη σύμβαση ανεξάρτητων υπηρεσιών. Στην επόμενη ενότητα αναλύσαμε τις προϋποθέσεις νομιμότητας της προσωρινής απασχόλησης και τις συνέπειες μη τήρησης αυτών. Στην τρίτη ενότητα ασχοληθήκαμε με τις έννομες σχέσεις, που αναπτύσσονται μεταξύ των εμπλεκόμενων προσώπων. Ακόμη θίξαμε ορισμένα ζητήματα συλλογικού εργατικού δικαίου. Στην τελευταία ενότητα εξετάσαμε ορισμένα ειδικά ζητήματα.
description: The aim of the present Master’s thesis was the study of the temporary agency work, a type of nonstandard work. In the first chapter we presented the laws applied on the temporary agency work and the definition of it, as well as the three parts, which enter in this legal relationship. Moreover we analyzed the legal status of the two contracts, the temporary employment contract and the assignment contract, and we mentioned briefly the benefits and the drawbacks of it. After that we made a distinction between the temporary agency work and the hiring out of employees, the placement service, the contract of work and the service agreement. In the next chapter we analyzed the preconditions of the legality of the temporary agency work and the consequences of their violation. In the third chapter we examined the legal relations between the parts, which enter the temporary employment. We also examined a few matters of collective labour law. In the last chapter we mentioned some more specific matters.
Power of unentangled measurements on two antiparallel spins
Creators: name: Vértesi, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a pair of antiparallel spins polarized in a random direction to encode quantum information. We wish to extract as much information as possible on the polarization direction attainable by an unentangled measurement, i.e., by a measurement, whose outcomes are associated with product states. We develop analytically the upper bound 0.7935 bits to the Shannon mutual information obtainable by an unentangled measurement, which is definitely less than the value 0.8664 bits attained by an entangled measurement. This proves our main result, that not every ensemble of product states can be optimally distinguished by an unentangled measurement, if the measure of distinguishability is defined in the sense of Shannon. We also present results from numerical calculations and discuss briefly the case of parallel spins.
description: Latex file, 18 pages, 1 figure; published version
Spin dynamics and electronic structure of muonium and its charged states in silicon and gallium arsenide
Creators: name: Chow, K. H.
Publisher: name: University of British Columbia
Year: 2009

description: This thesis describes recent fiSH measurements on muonium (Mu=μ⁺e⁻) centers in crystalline Si and GaAs. Spin-exchange scattering and charge-exchange of Mu with conduction electrons are found to be important dynamical processes in these systems. Longitudinal muon spin relaxation (1/T₁) measurements in intrinsic Si and p-type Si:B from 350 K to 900 K can be explained within a model where Mu cycles rapidly between its positive and neutral charge states via interaction with conduction electrons. The average muon-electron hyperfine parameter in the neutral state is consistent with Mu at the tetrahedral (T) interstitial site. This indicates that at the highest temperatures measured neutral Mu spends significant time away from the bond center site, the calculated minimum in the adiabatic potential energy surface. Measurements of the 1/ T₁ rates were made in intermediate doped n-type Si and heavily doped n-type GaAs under conditions where coherent spin precession of Mu is unobservable. A peak in 1/ T₁ as a function of magnetic field is observed and shown to be characteristic of neutral bond-centered Mu (Mu⁰[sub BC]) undergoing spin-exchange scattering with free carriers. These results establish that neutral Mu⁰[sub BC] does not convert to Mu⁻ , the expected stable state in n-type Si, at temperatures below approximately 200 K. Furthermore, we conclude Mu⁰[sub BC] is present in heavily doped n-type GaAs below ≈ 30 K. At very high spin-exchange rates, such as in heavily doped Si:P, and under the application of a large magnetic field, Mu⁰[sub BC is "spin-polarized" and a frequency shift from the Larmor precession frequency of a free muon is observed. Muon level-crossing resonance and muon spin rotation measurements on heavilydoped n-type GaAs:Si and GaAs:Te show that the majority of positive muons implanted at room temperature form an isolated diamagnetic Mu center located at a high-symmetry site with Ga neighbors along the (111) direction(s). The experimental results, together with simple theoretical considerations, imply that the center is Mu⁻ located at or near a T[sub Ga] site. These studies on Mu have bearing on research on hydrogen in semiconductors. In particular, the spin dynamics taking place for Mu should also be occuring with hydrogen. The importance of such processes is usually not taken into account by researchers of hydrogen diffusion and related dynamics. The characterization of Mu⁻ is the first experimental determination of the detailed local structure of a charged isolated hydrogen or Mu center in any semiconductor. This is especially interesting since the existence of isolated H⁻ in semiconductors is still being debated.
Βυζαντινά εγκώμια για τον άγιο Εύπλο
Creators: name: Χαρταβέλλα, Ελισσάβετ Θεόδωρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Εύπλος
Ακροπολίτης
Ασκανδάλης
Euplos
Akropolites
Askandales

description: Σκοπός της παρούσας μεταπτυχιακής εργασίας είναι η μελέτη και η κριτική έκδοση δύο εγκωμίων της Παλαιολόγειας εποχής για τον άγιο Εύπλο, γραμμένα από τον Κωνσταντίνο Ακροπολίτη και τον Ιωάννη Ασκανδάλη. Η εργασία χωρίζεται σε τρία μέρη. Το πρώτο μέρος είναι εισαγωγικό και αφορά στην αγιολογία της Παλαιολόγειας εποχής και στην αγιολογική παράδοση για τον άγιο Εύπλο. Τα επόμενα δύο μέρη περιλαμβάνουν την κριτική έκδοση των εγκωμίων. Αποτελούνται από μια εισαγωγή, στην οποία παρουσιάζεται ο συγγραφέας και εξετάζονται το χειρόγραφο, η δομή, η γλώσσα και το ύφος, αλλά και ο καταληκτήριος ρυθμός των εγκωμίων. Στη συνέχεια ακολουθεί η κριτική έκδοση, η περίληψη και τα σχόλια.
description: The purpose of this master thesis is the study and the critical edition of two encomia on St. Euplos written at the Palaiologan era by Constantine Akropolites and Ioannes Askandales. The thesis is divided into three parts. The first part discusses the Hagiography of the Palaiologan era and the hagiographical dossier of St. Euplos. The second and third parts consist of an introduction to the edited texts examining the manuscript, the structure, the language, the style and the prose rhythm of the encomia. This is followed by the critical edition, summary and commentary.
GRO J1655-40: Early Stages of the 2005 Outburst
Creators: name: Shaposhnikov, N.
name: Swank, J.
name: Shrader, C. R.
name: Rupen, M.
name: Beckmann, V.
name: Markwardt, C. B.
name: Smith, D. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The black-hole X-ray binary transient GRO J1655-40 underwent an outburst beginning in early 2005. We present the results of our multi-wavelength observational campaign to study the early outburst spectral and temporal evolution, which combines data from X-ray (RXTE, INTEGRAL), radio (VLA) and optical (ROTSE, SMARTS) instruments. During the reported period the source left quiescence and went through four major accreting black hole states: low-hard, hard intermediate, soft intermediate and high-soft. We investigated dipping behavior in the RXTE band and compare our results to the 1996-1997 case, when the source was predominantly in the high-soft state, finding significant differences. We consider the evolution of the low frequency quasi-periodic oscillations and find that the frequency strongly correlates with the spectral characteristics, before shutting off prior to the transition to the high-soft state. We model the broad-band high-energy spectrum in the context of empirical models, as well as more physically motivated thermal and bulk-motion Comptonization and Compton reflection models. RXTE and INTEGRAL data together support a statistically significant high energy cut-off in the energy spectrum at 100~200 keV during the low-hard state. The RXTE data alone also show it very significantly during the transition, but cannot see one in the high-soft state spectra. We consider radio, optical and X-ray connections in the context of possible synchrotron and synchrotron self-Compton origins of X-ray emission in low-hard and intermediate states. In this outburst of GRO J1655-40, the radio flux does not rise strongly with the X-ray flux.
description: 23 pages, 16 figures, accepted for publication in ApJ
The hot interstellar medium towards 4U 1820-30: a Bayesian analysis
Creators: name: Rogantini, Daniele
name: Costantini, Elisa
name: Mehdipour, Missagh
name: Kuiper, Lucien
name: Ranalli, Piero
name: Waters, Rens
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: High ionisation lines in the soft X-ray band are generally associated to either interstellar hot gas along the line of sight or to photoionised gas intrinsic to the source. In the low-mass X-ray binary 4U 1820-30, the nature of these lines is not well understood. We characterised the ionised gas present along the line of sight towards the source producing the X-ray absorption lines of Mg XI, Ne IX, Fe XVII, O VII, and O VIII. We analysed all the observations available for this source in the XMM-Newton and Chandra archives, taken with the RGS, HETG, and LETG spectrometers. The high-resolution grating spectra have been accurately examined through a standard X-ray analysis based on the $C$-statistic and through the Bayesian parameter inference. We tested two physical models which describe a plasma in either collisional ionisation or photoionisation equilibrium. We adopted the Bayesian model comparison to statistically compare the different combinations of the models used for the analysis.} We found that the lines are consistent with hot gas in the interstellar medium rather than being associated with the intrinsic gas of the X-ray binary. Our best-fit model reveals the presence of a collisionally ionised plasma with a temperature of $T=(1.98\pm0.05)\times10^6 $ K. The photoionisation model fails to fit the Fe XVII line (which is detected with a significance of $6.5σ$) due to the low column density predicted by the model. Moreover, the low inclination of the binary system is likely the reason for the non-detection of ionised gas intrinsic to the source.}
description: 13 pages, 7 Figure, Accepted for publication in A&A
High critical current density and improved flux pinning in bulk MgB2 synthesized by Ag addition
Creators: name: Shekhar, Chandra
name: Giri, Rajiv
name: Tiwari, R. S.
name: Malik, S. K.
name: Srivastava, O. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In the present investigation, we report a systematic study of Ag admixing in MgB2 prepared by solid-state reaction at ambient pressure. All the samples in the present investigation have been subjected to structural/ microstructural characterization employing x-rays diffraction (XRD) and transmission electron microscopic (TEM) techniques. The magnetization measurements were performed by physical property measurement system (PPMS). The TEM investigations reveal the formation of MgAg nanoparticles in Ag admixed samples. These nanoparticles may enhance critical current density due to their size (~5-20 nm) compatible with coherence length of MgB2 (~5-6 nm). In order to study the flux pinning effect of Ag admixing in MgB2, the evaluation of intragrain critical current density (Jc) has been carried out through magnetic measurements on the fine powdered version of the as synthesized samples. The optimum result on intragrain Jc is obtained for 10 at.% Ag admixed sample at 5K. This corresponds to 9.23x10^7 A/cm^2 in self-field,5.82x10^7 A/cm^2 at 1T,4.24 x10^6 A/cm^2 at 3.6T and 1.52x10^5 A/cm^2 at 5T. However, intragrain Jc values for MgB2 sample without Ag admixing are 2.59x10^6 A/cm^2,1.09x10^6A/cm^2,4.53x10^4 A/cm^2 and 2.91x10^3A/cm^2 at 5 K in self field, 1T, 3.6T and 5T respectively.. The high value of intragrain Jc for Ag admixed MgB2 superconductor has been attributed to the inclusion of MgAg nanoparticles into the crystal matrix of MgB2, which are capable of providing effective flux pinning centres. A feasible correlation between microstructural features and superconducting properties has been put forward.
description: 5pages,6figures
Ανάπτυξη αυτόματης μεθόδου για τον προσδιορισμό του μολύβδου σε φυσικά νερά και βιολογικά δείγματα με την τεχνική της On line εκχύλισης στεράς φάσης σε συνδυασμό με τη φασματομετρία ατομικής
Creators: name: Κοτζαμανίδου, Αλεξάνδρα Γερασίμου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ανάλυση με έγχυση σε ροή
Aυτοματοποίηση
Flow injection
Automation

description: Ο μόλυβδος ανήκει στα βαρέα μέταλλα και ο προσδιορισμός του κρίνεται συχνά αναγκαίος κατά την ανάλυση περιβαλλοντικών και βιολογικών δειγμάτων, λόγω της τοξικότητάς του. Για τον προσδιορισμό του μολύβδου σε ανάλογα δείγματα, απαιτούνται αναλυτικές τεχνικές υψηλής εκλεκτικότητας και χαμηλών ορίων ανίχνευσης λόγω της μικρής συγκέντρωσής του. Στην παρούσα μελέτη συνδυάστηκε η on-line τεχνική προσυγκέντρωσης με εκχύλιση στερεάς φάσης (SPE), με τη φασματομετρία ατομικής απορρόφησης με φλόγα (FAAS) χρησιμοποιώντας μικροστήλη πληρωμένη με το προσροφητικό υλικό Nobias-chelate PA1 για τον προσδιορισμό του μολύβδου. Η ρητίνη Nobias-chelate PA1, η οποία μελετήθηκε αποτελείται από υδρόφιλο μεθακρυλικό πολυμερές το οποίο περιέχει δύο χαρακτηριστικές ομάδες, EDTriA (αιθυλενοδιαμινοτριοξικό οξύ) και IDA (ιμινοδιοξικό οξύ). Τα ιόντα των μετάλλων, κατά το στάδιο της έκλουσης, συγκρατούνται στην επιφάνεια της ρητίνης σχηματίζοντας χηλικά σύμπλοκα. Στη συνέχεια γίνεται η έκλουση των ιόντων με διάλυμα νιτρικού οξέος και on-line εισαγωγή του εκλούσματος στο θάλαμο νεφοποίησης, για ποσοτικοποίηση με φασματομετρία ατομικής απορρόφησης φλόγας. Η αυτόματη μέθοδος προσδιορισμού του μολύβδου που αναπτύχθηκε είναι απλή, οικονομική, ευαίσθητη και παρουσιάζει καλά αναλυτικά χαρακτηριστικά απόδοσης.
description: An automatic flow injection (FI) solid phase extraction system (SPE) coupled to flame atomic absorption spectrometry (FAAS) has been developed for trace amount of lead determination in natural waters and biological samples using Nobias-chelate PA1 chelating resin as sorbent material packed in a minicolumn. This resin has both the EDTriA and IDA functional groups, making it an excellent chelator of the lead. The generated complex was eluted by HNO3 and introduced directly into the nebulizer via a flow compensation unit. All the main factors such as pH, loading flow rate and elution flow rate, preconcentration time and interfering ions were studied in detail for a quantitative preconcentration and determination of lead. The proposed method, FI-SPE-FAAS, showed a high tolerance to the commonly matrix elements in environmental waters and biological samples and it was successfully applied for lead determination in natural samples and biological fluids.
ปริมาณกรดไขมันชนิดทรานส์ในปาท่องโก๋ที่ใช้น้ำมันทอดซ้ำ
Creators: name: วัชราภรณ์ ใจกระเสน
name: ลินนา ทองยงค์
name: ชำนาญ ภัตรพานิช
Publisher: name: วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
Year: 2556
Subjects: กรดไขมันชนิดทรานส์,ปาท่องโก๋,อาหารทอด,น้ำมันทอดซ้ำ

description: 2, 6, วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
AGNs and galaxy interactions
Creators: name: Alonso, M. Sol
name: Lambas, Diego G.
name: Tissera, Patricia
name: Coldwell, Georgina
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We perform a statistical analysis of AGN host characteristics and nuclear activity for AGNs in pairs and without companions. Our study concerns a sample of AGNs derived from the SDSS-DR4 data by Kauffmann et al (2003) and pair galaxies obtained from the same data set by Alonso et al. (2006). An eye-ball classification of images of 1607 close pairs ($r_p<25$ kpc $h^{-1}$, $ΔV<350$ km $s^{-1}$) according to the evidence of interaction through distorted morphologies and tidal features provides us with a more confident assessment of galaxy interactions from this sample. We notice that, at a given luminosity or stellar mass content, the fraction of AGNs is larger for pair galaxies exhibiting evidence for strong interaction and tidal features which also show sings of strong star formation activity. Nevertheless, this process accounts only for a $\sim 10%$ increase of the fraction of AGNs. As in previous works, we find AGN hosts to be redder and with a larger concentration morphological index than non-AGN galaxies. This effect does not depend whether AGN hosts are in pairs or in isolation. The OIII luminosity of AGNs with strong interaction features is found to be significantly larger than that of other AGNs, either in pairs or in isolation. Estimations of the accretion rate, $L[OIII]/M_{BH}$, show that AGNs in merging pairs are actively feeding their black holes, regardless of their stellar masses. We also find that the luminosity of the companion galaxy seems to be a key parameter in the determination of the black hole activity. At a given host luminosity, both the OIII luminosity and the $L[OIII]/M_{BH}$ are significantly larger in AGNs with a bright companion ($M_r < -20$) than otherwise.
description: 9 pages, 9 figures, accepted MNRAS
Foveated Model Observers for Visual Search in 3D Medical Images
Creators: name: Lago, Miguel A.
name: Abbey, Craig K.
name: Eckstein, Miguel P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Model observers have a long history of success in predicting human observer performance in clinically-relevant detection tasks. New 3D image modalities provide more signal information but vastly increase the search space to be scrutinized. Here, we compared standard linear model observers (ideal observers, non-pre-whitening matched filter with eye filter, and various versions of Channelized Hotelling models) to human performance searching in 3D 1/f$^{2.8}$ filtered noise images and assessed its relationship to the more traditional location known exactly detection tasks and 2D search. We investigated two different signal types that vary in their detectability away from the point of fixation (visual periphery). We show that the influence of 3D search on human performance interacts with the signal's detectability in the visual periphery. Detection performance for signals difficult to detect in the visual periphery deteriorates greatly in 3D search but not in 3D location known exactly and 2D search. Standard model observers do not predict the interaction between 3D search and signal type. A proposed extension of the Channelized Hotelling model (foveated search model) that processes the image with reduced spatial detail away from the point of fixation, explores the image through eye movements, and scrolls across slices can successfully predict the interaction observed in humans and also the types of errors in 3D search. Together, the findings highlight the need for foveated model observers for image quality evaluation with 3D search.
description: 14 pages, 7 figures, conference
การเจริญของเซลล์เมลาโนมาในการเพาะเลี้ยงในหลอดทดลองที่มีสารสกัดจากอินทนิลน้ำ (Lagerstroemia speciosa (L.) Per.)
Creators: name: ณัฐพร บู๊ฮวด
name: ปิยนุช พรมภมร
name: ทัศนีย์ พาณิชย์กุล
name: จิระวดี วิริยะแสงจันทร์
name: ประภาศิริ ปราโมทย์
name: พัชรีภรณ์ พิสุราช
name: มลิวัลย์ เอมแย้ม
Publisher: name: วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
Year: 2557
Subjects: เซลล์เมลาโนมา,สารสกัด,อินทนิลน้ำ

description: 1, 7, วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
Minigap, Parity Effect and Persistent Currents in SNS Nanorings
Creators: name: Kalenkov, Mikhail S.
name: Kloos, Harald
name: Zaikin, Andrei D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have evaluated a proximity-induced minigap in the density of states (DOS) of SNS junctions and SNS nanorings at an arbitrary concentration of non-magnetic impurities. We have demonstrated that an isotropic energy minigap in the electron spectrum opens up already at arbitrarily weak disorder, while angle resolved DOS at higher energies can remain strongly anisotropic. The minigap value $ε_g$ can be tuned by passing a supercurrent through an SNS junction or by applying a magnetic flux $Φ$ to an SNS ring. A non-monotonous dependence of $ε_g$ on $Φ$ has been found at weak disorder. We have also studied persistent currents in isolated SNS nanorings. For odd number of electrons in the ring we have found a non-trivial current-phase (current-flux) relation which -- at relatively high disorder -- may lead to a $π$-junction state and spontaneous currents in the ground state of the system.
description: 7 pages, 8 figures
Why Developers Refactor Source Code: A Mining-based Study
Creators: name: Pantiuchina, Jevgenija
name: Zampetti, Fiorella
name: Scalabrino, Simone
name: Piantadosi, Valentina
name: Oliveto, Rocco
name: Bavota, Gabriele
name: Di Penta, Massimiliano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Refactoring aims at improving code non-functional attributes without modifying its external behavior. Previous studies investigated the motivations behind refactoring by surveying developers. With the aim of generalizing and complementing their findings, we present a large-scale study quantitatively and qualitatively investigating why developers perform refactoring in open source projects. First, we mine 287,813 refactoring operations performed in the history of 150 systems. Using this dataset, we investigate the interplay between refactoring operations and process (e.g., previous changes/fixes) and product (e.g., quality metrics) metrics. Then, we manually analyze 551 merged pull requests implementing refactoring operations and classify the motivations behind the implemented refactorings (e.g., removal of code duplication). Our results led to (i) quantitative evidence of the relationship existing between certain process/product metrics and refactoring operations and (ii) a detailed taxonomy, generalizing and complementing the ones existing in the literature, of motivations pushing developers to refactor source code.
description: Accepted to the ACM Transactions on Software Engineering and Methodology
การพัฒนามัฟฟินเนื้อตาลสุกผสมลูกตาล
Creators: name: ธีรนุช ฉายศิริโชติ
name: จันทร์จนา ศิริพันธ์วัฒนา
Publisher: name: วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
Year: 2557
Subjects: เนื้อตาล,ลูกตาล,มัฟฟิน,ขนมอบ

description: 1, 7, วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
Bid Shading in The Brave New World of First-Price Auctions
Creators: name: Gligorijevic, Djordje
name: Zhou, Tian
name: Shetty, Bharatbhushan
name: Kitts, Brendan
name: Pan, Shengjun
name: Pan, Junwei
name: Flores, Aaron
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Online auctions play a central role in online advertising, and are one of the main reasons for the industry's scalability and growth. With great changes in how auctions are being organized, such as changing the second- to first-price auction type, advertisers and demand platforms are compelled to adapt to a new volatile environment. Bid shading is a known technique for preventing overpaying in auction systems that can help maintain the strategy equilibrium in first-price auctions, tackling one of its greatest drawbacks. In this study, we propose a machine learning approach of modeling optimal bid shading for non-censored online first-price ad auctions. We clearly motivate the approach and extensively evaluate it in both offline and online settings on a major demand side platform. The results demonstrate the superiority and robustness of the new approach as compared to the existing approaches across a range of performance metrics.
description: In Proceedings of the 29th ACM International Conference on Information and Knowledge Management (CIKM'20), October 19-23, 2020, Virtual Event, Ireland
Large-amplitude Electron Oscillations in a Plasma Slab
Creators: name: Stenflo, L.
name: Marklund, M.
name: Brodin, G.
name: Shukla, P. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Nonlinear oscillations within a plasma slab are analyzed. Two types of solutions are found, depending on the initial value of the electron density. The first represents regular oscillations within the plasma slab, while the second gives rise to explosive growth at the slab centre or at the edges. The results are discussed.
description: 5 pages, 4 figures, to appear in Journal of Plasma Physics
Temperature dependence of exciton recombination in semiconducting single-wall carbon nanotubes
Creators: name: Berger, S.
name: Voisin, C.
name: Cassabois, G.
name: Delalande, C.
name: Roussignol, Philippe
name: Marie, X.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the excitonic recombination dynamics in an ensemble of (9,4) semiconducting single-wall carbon nanotubes by high sensitivity time-resolved photo-luminescence experiments. Measurements from cryogenic to room temperature allow us to identify two main contributions to the recombination dynamics. The initial fast decay is temperature independent and is attributed to the presence of small residual bundles that create external non-radiative relaxation channels. The slow component shows a strong temperature dependence and is dominated by non-radiative processes down to 40 K. We propose a quantitative phenomenological modeling of the variations of the integrated photoluminescence intensity over the whole temperature range. We show that the luminescence properties of carbon nanotubes at room temperature are not affected by the dark/bright excitonic state coupling.
การจัดทำแผนยุทธศาสตร์ระดับชุมชนในการผลิตน้ำมันดีเซลจากชีวมวลไม้โตเร็ว
Creators: name: กฤตภาส ศุภกรมงคล
name: นิคม แหลมสัก
name: พรรณภา ศักดิ์สูง
Publisher: name: วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
Year: 2557
Subjects: ชีวมวล,ดีเซล,ไม้โตเร็ว,แผนยุทธศาสตร์

description: 1, 7, วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
On the connection between intermittency and dissipation in ocean turbulence
Creators: name: Isern-Fontanet, Jordi
name: Turiel, Antonio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The multifractal theory of turbulence is used to investigate the energy cascade in the Northwestern Atlantic ocean. The statistics of singularity exponents of velocity gradients computed from in situ measurements are used to show that the anomalous scaling of the velocity structure functions at depths between 50 ad 500 m has a linear dependence on the exponent characterizing the strongest velocity gradient, with a slope that decreases with depth. Since the distribution of exponents is asymmetric about the mode at all depths, we use an infinitely divisible asymmetric model of the energy cascade, the log-Poisson model, to derive the functional dependence of the anomalous scaling with dissipation. Using this model we can interpret the vertical change of the linear slope as a change in the energy cascade.
description: 15 pages, 5 figures
Stabilising a nulling interferometer using optical path difference dithering
Creators: name: Gabor, Pavel
name: Chazelas, Bruno
name: Brachet, Frank
name: Ollivier, Marc
name: Decaudin, Michel
name: Jacquinod, Sophie
name: Labèque, Alain
name: Léger, Alain
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context. Nulling interferometry has been suggested as the underlying principle for the Darwin and TPF-I exoplanet research missions. Aims. There are constraints both on the mean value of the nulling ratio, and on its stability. Instrument instability noise is most detrimental to the stability of the nulling performance. Methods. We applied a modified version of the classical dithering technique to the optical path difference in the scientific beam. Results. Using only this method, we repeatedly stabilised the dark fringe for several hours. This method alone sufficed to remove the 1/ f component of the noise in our setup for periods of 10 minutes, typically. These results indicate that performance stability may be maintained throughout the long-duration data acquisitions typical of exoplanet spectroscopy. Conclusions. We suggest that further study of possible stabilisation strategies should be an integral part of Darwin/TPF-I research and development
อาหารและบทบาทการกินอาหารของกลุ่มแมลงน้ำในลำห้วยแม่ตาว อำเภอแม่สอด จังหวัดตาก
Creators: name: สุชาดา ไกรเพชร
name: อำพล พยัคฆา
name: แตงอ่อน พรหมมิ
Publisher: name: วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
Year: 2557
Subjects: บทบาทการกินอาหาร,แมลงน้ำ,คุณภาพน้ำ

description: 1, 7, วารสารวิจัย มสด สาขาวิทยาศาสตร์และเทคโนโลยี
MPEC 2024-T166 : 2024 TA4
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TA4

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.