cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The two-loop supersymmetric corrections to lepton anomalous magnetic and electric dipole moments
Creators: name: Feng, Tai-Fu
name: Li, Xue-Qian
name: Lin, Lin
name: Maalampi, Jukka
name: Song, He-Shan
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using the effective Lagrangian method, we analyze the electroweak corrections to the anomalous dipole moments of lepton from some special two-loop topological diagrams which are composed of neutralino (chargino) - slepton (sneutrino) in the minimal supersymmetric extension of the standard model (MSSM). Considering the translational invariance of the inner loop momenta and the electromagnetic gauge invariance, we get all dimension 6 operators and derive their coefficients. After applying equations of motion to the external leptons, the anomalous dipole moments of lepton are obtained. The numerical results imply that there is a parameter space where the two-loop supersymmetric corrections to the muon anomalous dipole moments may be significant.
description: Revtex, 45 pages, including 8 figs
Nuclear collective excitations using correlated realistic interactions: the role of explicit RPA correlations
Creators: name: Papakonstantinou, P.
name: Roth, R.
name: Paar, N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We examine to which extent correlated realistic nucleon-nucleon interactions, derived within the Unitary Correlation Operator Method (UCOM), can describe nuclear collective motion in the framework of first-order random-phase approximation (RPA). To this end we employ the correlated Argonne V18 interaction in calculations within the so-called "Extended" RPA (ERPA) and investigate the response of closed-shell nuclei. The ERPA is a renormalized RPA version which considers explicitly the depletion of the Fermi sea due to long-range correlations and thus allows us to examine how these affect the excitation spectra. It is found that the effect on the properties of giant resonances is rather small. Compared to the standard RPA, where excitations are built on top of the uncorrelated Hartree-Fock (HF) ground state, their centroid energies decrease by up to 1 MeV, approximately, in the isovector channel. The isoscalar response is less affected in general. Thus, the disagreement between our previous UCOM-based RPA calculations and the experimental data are to be attributed to other effects, mainly to a residual three-body force and higher-order configurations. Ground-state properties obtained within the ERPA are compared with corresponding HF and perturbation-theory results and are discussed as well. The ERPA formalism is presented in detail.
description: 13 pages, incl. 7 figures and 1 table
Regional competitiveness for attracting and retaining foreign direct investment: a configurational analysis of Chinese provinces
Creators: name: Cui, Lin
name: Fan, Di
name: Li, Yi
name: Choi, Yoona
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Medicine
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology

description: This study examines the entry and exit of multinational enterprises (MNEs) across regions in China. It analyses the strategic entry and exit of MNEs in 31 Chinese provinces during the period 2001–07. The fuzzy-set qualitative comparative analysis (fsQCA) reveals multiple regional competitiveness profiles, as configurations of economic and institutional conditions, which are associated with a large scale of MNE entries and/or exits. It is found that while MNEs tend to exit regions with deficiencies in economic conditions, they are attracted to regions with favourable economic conditions and low state intervention, which also results in heightened market competition leading to the restructuring of foreign investors.
Hadron Correlations and Parton Recombination
Creators: name: Fries, Rainer J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Parton recombination has been found to be an extremely useful model to understand hadron production at the Relativistic Heavy Ion Collider. It is particularly important to explore its connections with hard processes. This article reviews some of the aspects of the quark recombination model and places particular emphasis on hadron correlations.
description: 8 pages, 4 fig.; contribution to Hard Probes 2006; to appear in Nucl. Phys. A
Generalizing the coupling between geometry and matter: $f(R,L_m,T)$ gravity
Creators: name: Haghani, Zahra
name: Harko, Tiberiu
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We generalize and unify the $f(R,T)$ and $f(R,L_m)$ type gravity models by assuming that the gravitational Lagrangian is given by an arbitrary function of the Ricci scalar $R$, of the trace of the energy-momentum tensor $T$, and of the matter Lagrangian $L_m$, so that $L_{grav}=f(R,L_m,T)$. We obtain the gravitational field equations in the metric formalism, the equations of motion for test particles, and the energy and momentum balance equations, which follow from the covariant divergence of the energy-momentum tensor. Generally, the motion is non-geodesic, and takes place in the presence of an extra force orthogonal to the four-velocity. The Newtonian limit of the equations of motion is also investigated, and the expression of the extra acceleration is obtained for small velocities and weak gravitational fields. The generalized Poisson equation is also obtained in the Newtonian limit, and the Dolgov-Kawasaki instability is also investigated. The cosmological implications of the theory are investigated for a homogeneous, isotropic and flat Universe for two particular choices of the Lagrangian density $f(R,L_m,T)$ of the gravitational field, with a multiplicative and additive algebraic structure in the matter couplings, respectively, and for two choices of the matter Lagrangian, by using both analytical and numerical methods.
description: 21 pages, 3 figures, accepted for publication in EPJC; references added
Brazil-nut effect versus reverse Brazil-nut effect in a moderately dense granular fluid
Creators: name: Garzo, Vicente
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A new segregation criterion based on the inelastic Enskog kinetic equation is derived to show the transition between the Brazil-nut effect (BNE) and the reverse Brazil-nut effect (RBNE) by varying the different parameters of the system. In contrast to previous theoretical attempts the approach is not limited to the near-elastic case, takes into account the influence of both thermal gradients and gravity and applies for moderate densities. The form of the phase-diagrams for the BNE/RBNE transition depends sensitively on the value of gravity relative to the thermal gradient, so that it is possible to switch between both states for given values of the mass and size ratios, the coefficients of restitution and the solid volume fraction. In particular, the influence of collisional dissipation on segregation becomes more important when the thermal gradient dominates over gravity than in the opposite limit. The present analysis extends previous results derived in the dilute limit case and is consistent with the findings of some recent experimental results.
description: 4 figures
Perspective: The dusty plasma experiments a learning tool for physics graduate students
Creators: name: Choudhary, Mangilal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics Education (physics.ed-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: The plasma is an ionized gas that responses collectively to any external (or internal) perturbations. Introducing micron-sized solid dust grains into plasma makes it more interesting. The solid grains acquire large negative charges on their surface and exhibits collective behavior similar to the ambient plasma medium. Some remarkable features of the charged dust grain medium (dusty plasma) allow us to use it as a model system to understand some complex phenomena at a microscopic level. In this perspective paper, the author highlights the role of dusty plasma experiments as a learning tool at undergraduate and post-graduate physics programs. The students could have great opportunities to understand some basic physical phenomena as well as to learn many advanced data analysis tools and techniques by performing dusty plasma experiments. How a single dusty plasma experimental device at a physics laboratory can help undergraduate and post-graduate students in the learning process is discussed.
description: 13,10
Τεχνικές Μηχανικής Μάθησης για πρόβλεψη κατανάλωσης φυσικού αερίου
Creators: name: Χριστέλης, Ευάγγελος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Μηχανική μάθηση
Φυσικό αέριο
Σύστημα προβλέψεων
Machine Learning
Natural gas
Prediction system

description: Αντικείμενο της παρούσας διπλωματικής εργασίας είναι η πρόβλεψη κατανάλωσης φυσικού αερίου. Συγκεκριμένα, στόχος της διπλωματικής ήταν η ανάπτυξη μιας εφαρμογής με φιλικό περιβάλλον χρήσης, με βάση το οποίο οι ΕΠΑ (Εταιρεία Παροχής Αερίου) Θεσσαλονίκης και Θεσσαλίας, θα εκτελούν ημερήσιες προβλέψεις κατανάλωσης αερίου. Η ενασχόληση με το συγκεκριμένο θέμα αποτελεί μια πραγματικά σημαντικό για την υγιή οικονομική πορεία των ΕΠΑ. Οι ΕΠΑ δηλώνουν σε ημερήσια βάση πρόβλεψη κατανάλωσης για την επόμενη μέρα. Αν αυτή η πρόβλεψη βρίσκεται εκτός των ορίων του ±15% της πραγματικής κατανάλωσης, τότε υπάρχει οικονομική ποινή για την εταιρεία, ανάλογη της διαφοράς της ποσότητας αερίου που παραγγέλθηκε από αυτήν που τελικά καταναλώθηκε. Συνεπώς, η κατασκευή ενός μοντέλου με μεγάλη ακρίβεια είναι απαραίτητο για την οικονομική ευημερία της εταιρείας. Η εφαρμογή δίνει την δυνατότητα στον χρήστη-υπάλληλο να καταχωρεί την ημερήσια κατανάλωση και να προβλέπει τις μελλοντικές με την χρήση μοντέλων της μηχανικής μάθησης. Ακόμη, παρουσιάζονται αναλυτικά οι πειραματισμοί με διάφορους αλγορίθμους τόσο από την περιοχή της μηχανικής μάθησης όσο και από την περιοχή της ανάλυσης χρονοσειρών. Η εργασία αυτή εκπονήθηκε σε συνεργασία με την ομάδα Μηχανικής Μάθησης και Ανακάλυψης Γνώσης του τμήματος Πληροφορικής ΑΠΘ και με τις παραπάνω ΕΠΑ.
description: The subject of this thesis is the prediction of natural gas consumption. Specifically, the aim of the thesis was to develop an application, with user friendly environment, under which the GSC (Gas Supply Company) of Thessaloniki and Thessaly, will perform daily forecasts for gas consumption. Dealing with this issue is tremendously important for the healthy economic development of the GSC. The GSC declare, on a daily basis, a consumption forecast for the next day. If this prediction is outside the limits of ± 15% of the actual consumption, there is a financial penalty on the company, proportional to the difference of the gas quantity ordered than that finally consumed. Therefore, the construction of a very accurate model is essential for the economic prosperity of the company. The application gives the ability to the user to record daily the consumption and forecast the future values with the usage of machine learning models. Moreover, there are presented detailed experiments with various algorithms for prediction either from the ranks of the machine learning or from time series analysis techniques. The whole project was conducted in collaboration with the Machine Learning and Knowledge Discovery group AUTH IT department and the above Gas Supply Companies.
Universality of Single Spin Asymmetries in Hard Processes
Creators: name: Mulders, P. J.
name: Bomhof, C. J.
name: Pijlman, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the use of time reversal symmetry in the classification of parton correlators. Specifically, we consider the role of (small) intrinsic transverse momenta in these correlators and the determination of the proper color gauge link. The transverse momentum weighted correlators in hard processes can be expressed as a product of universal gluonic pole matrix elements and gluonic pole cross sections.
description: Contributed paper at DIS2006, 4 pages
Timing of the solar wind propagation delay between L1 and Earth based on machine learning
Creators: name: Baumann, Carsten
name: McCloskey, Aoife E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Erroneous GNSS positioning, failures in spacecraft operations and power outages due to geomagnetically induced currents are severe threats originating from space weather. Having knowledge of potential impacts on modern society in advance is key for many end-user applications. This covers not only the timing of severe geomagnetic storms but also predictions of substorm onsets at polar latitudes. In this study we aim at contributing to the timing problem of space weather impacts and propose a new method to predict the solar wind propagation delay between Lagrangian point L1 and the Earth based on machine learning, specifically decision tree models. The propagation delay is measured from the identification of interplanetary discontinuities detected by the Advanced Composition Explorer (ACE) and their subsequent sudden commencements in the magnetosphere recorded by ground-based magnetometers. A database of the propagation delay has been constructed on this principle including 380 interplanetary shocks. The feature set consists of six features, the three components of each the solar wind speed and position of ACE around L1. The machine learning results are compared to the flat propagation delay and the method based on the normal vector of solar wind discontinuities (vector delay). The ML model achieves an RMSE of 4.5 min with respect to the measured solar wind propagation delay and also outperforms the physical flat and vector delay models by 50 \% and 15 \% respectively. To increase the confidence in the predictions of the trained GB model, we perform a performance validation, provide feature importance and analyse the feature impact on the model output with Shapley values. The major advantage of the machine learning approach is its simplicity when it comes to its application. After training, input from only one ACE datapoint have to be fed into the algorithm for a prediction.
description: This manuscript has been accepted for publication in the Journal of Space Weather and Space Climate (JSWSC)
Bilepton effects on the WWV^* vertex in the 331 model with right-handed neutrinos via a SU_L(2)XU_Y(1) covariant quantization scheme
Creators: name: Ramirez-Zavaleta, F.
name: Tavares-Velasco, G.
name: Toscano, J. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In a recent paper, we investigated the effects of the massive charged gauge bosons (bileptons) predicted by the minimal 331 model on the off-shell vertex WWV^* (V=gamma, Z) using a SU_L(2) X U_Y(1) covariant gauge-fixing term for the bileptons. We proceed along the same lines and calculate the effects of the gauge bosons predicted by the 331 model with right-handed neutrinos. It is found that the bilepton effects on the WWV^* vertex are of the same order of magnitude than those arising from the SM and several of its extensions, provided that the bilepton mass is of the order of a few hundred of GeVs. For heavier bileptons, their effects on the WWV^* vertex are negligible. The behavior of the form factors at high energies is also discussed as it is a reflect of the gauge invariance and gauge independence of the WWV^* Green function obtained via our quantization method.
description: Replaced to match published version
Orbital ordering phenomena in $d$- and $f$-electron systems
Creators: name: Hotta, Takashi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In recent decades, novel magnetism of $d$- and $f$-electron compounds has been discussed very intensively both in experimental and theoretical research fields of condensed matter physics. It has been recognized that those material groups are in the same category of strongly correlated electron systems, while the low-energy physics of $d$- and $f$-electron compounds has been separately investigated rather in different manners. One of common features of both $d$- and $f$-electron systems is certainly the existence of active orbital degree of freedom, but in $f$-electron materials, due to the strong spin-orbit interaction in rare-earth and actinide ions, the physics seems to be quite different from that of $d$-electron systems. In general, when the number of internal degrees of freedom and relevant interactions is increased, it is possible to obtain rich phase diagram including large varieties of magnetic phases by using several kinds of theoretical techniques. However, we should not be simply satisfied with the reproduction of rich phase diagram. It is believed that more essential point is to seek for a simple principle penetrating complicated phenomena in common with $d$- and $f$-electron materials, which opens the door to a new stage in orbital physics. In this sense, it is considered to be an important task of this article to explain common features of magnetism in $d$- and $f$-electron systems from a microscopic viewpoint, using a key concept of orbital ordering, in addition to the review of the complex phase diagram of each material group.
description: 112 pages, 38 figures
Precise Neutron Lifetime Measurement Using Pulsed Neutron Beams at J-PARC
Creators: name: Sumi, N.
name: Hirota, K.
name: Ichikawa, G.
name: Ino, T.
name: Iwashita, Y.
name: Kajiwara, S.
name: Kato, Y.
name: Kitaguchi, M.
name: Mishima, K.
name: Morikawa, K.
name: Mogi, T.
name: Oide, H.
name: Okabe, H.
name: Otono, H.
name: Shima, T.
name: Shimizu, H. M.
name: Sugisawa, Y.
name: Tanabe, T.
name: Yamashita, S.
name: Yano, K.
name: Yoshioka, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A neutron decays into a proton, an electron, and an anti-neutrino through the beta-decay process. The decay lifetime ($\sim$880 s) is an important parameter in the weak interaction. For example, the neutron lifetime is a parameter used to determine the |$V_{\rm ud}$| parameter of the CKM quark mixing matrix. The lifetime is also one of the input parameters for the Big Bang Nucleosynthesis, which predicts light element synthesis in the early universe. However, experimental measurements of the neutron lifetime today are significantly different (8.4 s or 4.0$σ$) depending on the methods. One is a bottle method measuring surviving neutron in the neutron storage bottle. The other is a beam method measuring neutron beam flux and neutron decay rate in the detector. There is a discussion that the discrepancy comes from unconsidered systematic error or undetectable decay mode, such as dark decay. A new type of beam experiment is performed at the BL05 MLF J-PARC. This experiment measured neutron flux and decay rate simultaneously with a time projection chamber using a pulsed neutron beam. We will present the world situation of neutron lifetime and the latest results at J-PARC.
description: 8 pages, 6 figures, Proceedings of J-PARC Symposium 2019
Discussion of "EQUI-energy sampler" by Kou, Zhou and Wong
Creators: name: Chen, Ming-Hui
name: Kim, Sungduk
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Discussion of ``EQUI-energy sampler'' by Kou, Zhou and Wong [math.ST/0507080]
description: Published at http://dx.doi.org/10.1214/009053606000000498 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
The anticyclic operad of moulds
Creators: name: Chapoton, Frédéric
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 18D50, 05C05, 05E

description: A new anticyclic operad Mould is introduced, on spaces of functions in several variables. It is proved that the Dendriform operad is an anticyclic suboperad of this operad. Many operations on the free Mould algebra on one generator are introduced and studied. Under some restrictions, a forgetful map from moulds to formal vector fields is then defined. A connection to the theory of tilting modules for quivers of type A is also described.
Additional file 2 of Optimal therapeutic conditions for the neural stem cell-based management of ischemic stroke: a systematic review and network meta-analysis based on animal studies
Creators: name: Yang, Yongna
name: Hu, Xurui
name: Qin, Qijie
name: Kong, Fanling
name: Peng, Xiaolan
name: Zhao, Jing
name: Si, Jianghua
name: Yang, Zhilong
name: Xie, Shoupin
Publisher: name: figshare
Year: 2022
Subjects: Medicine
Neuroscience
Biotechnology
Biological Sciences not elsewhere classified
Science Policy

description: Additional file 2: Table 1. Search strategies. Table 2. Basic information of included studies. Table 3. Results of network meta-analysis among neural stem cells with different transplantation doses in rats. Table 4. Results of network meta-analysis among neural stem cells with different transplantation doses in mice. Table 5. Ranking results between different doses of neural stem cells transplantation in rats. Table 6. Ranking results between different doses of neural stem cells transplantation in mice. Figure 1. Traditional meta-analysis results of cerebral infarction volume. Figure 2. Traditional meta-analysis results of the first week of mNSS. Figure 3. Traditional meta-analysis results of the fourth week of mNSS.
Frequency-Temporal Attention Network for Singing Melody Extraction
Creators: name: Yu, Shuai
name: Sun, Xiaoheng
name: Yu, Yi
name: Li, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Sound (cs.SD)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Musical audio is generally composed of three physical properties: frequency, time and magnitude. Interestingly, human auditory periphery also provides neural codes for each of these dimensions to perceive music. Inspired by these intrinsic characteristics, a frequency-temporal attention network is proposed to mimic human auditory for singing melody extraction. In particular, the proposed model contains frequency-temporal attention modules and a selective fusion module corresponding to these three physical properties. The frequency attention module is used to select the same activation frequency bands as did in cochlear and the temporal attention module is responsible for analyzing temporal patterns. Finally, the selective fusion module is suggested to recalibrate magnitudes and fuse the raw information for prediction. In addition, we propose to use another branch to simultaneously predict the presence of singing voice melody. The experimental results show that the proposed model outperforms existing state-of-the-art methods.
description: This paper has been accepted by ICASSP 2021
Early Time Evolution of High Energy Heavy Ion Collisions
Creators: name: Fries, Rainer J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We solve the Yang-Mills equations in the framework of the McLerran-Venugopalan model for small times tau after a collision of two nuclei. An analytic expansion around tau=0 leads to explicit results for the field strength and the energy momentum tensor of the gluon field at early times. We then discuss constraints for the energy density, pressure and flow of the plasma phase that emerges after thermalization of the gluon field.
description: 4 pages, 1 figure; contribution to Quark Matter 2006; submitted to J. Phys. G
Multiband and impurity effects in infrared and optical spectra of MgB2
Creators: name: Kuzmenko, A. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A short review of the optical and far-infrared measurements on MgB$_{2}$ is given. Multiband and multigap effects are analyzed by comparing optical properties with other experiments and {\em ab initio} calculations. The covered topics are: the plasma frequency, electron-phonon interaction, impurity scattering, the effects of C and Al substitution, interband transitions and the far-infrared signatures of the superconducting gaps.
description: For the Special Physica C Issue on MgB2 (2007), 11 pages, 12 figures
SEPAL: Towards a Large-scale Analysis of SEAndroid Policy Customization
Creators: name: Yu, Dongsong
name: Yang, Guangliang
name: Meng, Guozhu
name: Gong, Xiaorui
name: Zhang, Xiu
name: Xiang, Xiaobo
name: Wang, Xiaoyu
name: Jiang, Yue
name: Chen, Kai
name: Zou, Wei
name: Lee, Wenke
name: Shi, Wenchang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: To investigate the status quo of SEAndroid policy customization, we propose SEPAL, a universal tool to automatically retrieve and examine the customized policy rules. SEPAL applies the NLP technique and employs and trains a wide&deep model to quickly and precisely predict whether one rule is unregulated or not.Our evaluation shows SEPAL is effective, practical and scalable. We verify SEPAL outperforms the state of the art approach (i.e., EASEAndroid) by 15% accuracy rate on average. In our experiments, SEPAL successfully identifies 7,111 unregulated policy rules with a low false positive rate from 595,236 customized rules (extracted from 774 Android firmware images of 72 manufacturers). We further discover the policy customization problem is getting worse in newer Android versions (e.g., around 8% for Android 7 and nearly 20% for Android 9), even though more and more efforts are made. Then, we conduct a deep study and discuss why the unregulated rules are introduced and how they can compromise user devices. Last, we report some unregulated rules to seven vendors and so far four of them confirm our findings.
description: 12 pages, 9 figures, accepted by WWW'21
RHESSI Results -- Time For a Rethink?
Creators: name: Brown, J. C.
name: Kontar, E. P.
name: Veronig, A. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Hard X-rays and gamma-rays are the most direct signatures of energetic electrons and ions in the sun's atmosphere which is optically thin at these energies and their radiation involves no coherent processes. Being collisional they are complementary to gyro-radiation in probing atmospheric density as opposed to magnetic field and the electrons are primarily 10--100 keV in energy, complementing the (>100 keV) electrons likely responsible for microwave bursts. The pioneering results of the Ramaty High Energy Solar Spectroscopic Imager (RHESSI) are raising the first new major questions concerning solar energetic particles in many years. Some highlights of these results are discussed -- primarily around RHESSI topics on which the authors have had direct research involvement -- particularly when they are raising the need for re-thinking of entrenched ideas. Results and issues are broadly divided into discoveries in the spatial, temporal and spectral domains, with the main emphasis on flare hard X-rays/fast electrons but touching also on gamma-rays/ions, non-flare emissions, and the relationship to radio bursts.
description: Proceedings CESRA Workshop 2004: "The High Energy Solar Corona: Waves, Eruptions, Particles", Lecture Notes in Physics, 2006 (accepted)
An Extra Structure of Spacetime: A Space of Points, Areas and Volumes
Creators: name: Pavsic, Matej
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A theory in which points, lines, areas and volumes are on on the same footing is investigated. All those geometric objects form a 16-dimensional manifold, called C-space, which generalizes spacetime. In such higher dimensional space fundamental interactions can be unified \` a la Kaluza-Klein. The ordinary, 4-dimensional, gravity and gauge fields are incorporated in the metric and spin connection, whilst the conserved gauge charges are related to the isometries of curved C-space. It is shown that a conserved generator of an isometry in C-space contains a part with derivatives, which generalizes orbital angular momentum, and a part with the generators of Clifford algebra, which generalizes spin.
description: 13 pages; A talk presented at the XXIX Spanish Relativity Meeting ERE 2006, 4th-8th September 2006, Palma de Mallorca, Spain
REST: Relational Event-driven Stock Trend Forecasting
Creators: name: Xu, Wentao
name: Liu, Weiqing
name: Xu, Chang
name: Bian, Jiang
name: Yin, Jian
name: Liu, Tie-Yan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Finance (q-fin.ST)
subject: Machine Learning (cs.LG)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: Stock trend forecasting, aiming at predicting the stock future trends, is crucial for investors to seek maximized profits from the stock market. Many event-driven methods utilized the events extracted from news, social media, and discussion board to forecast the stock trend in recent years. However, existing event-driven methods have two main shortcomings: 1) overlooking the influence of event information differentiated by the stock-dependent properties; 2) neglecting the effect of event information from other related stocks. In this paper, we propose a relational event-driven stock trend forecasting (REST) framework, which can address the shortcoming of existing methods. To remedy the first shortcoming, we propose to model the stock context and learn the effect of event information on the stocks under different contexts. To address the second shortcoming, we construct a stock graph and design a new propagation layer to propagate the effect of event information from related stocks. The experimental studies on the real-world data demonstrate the efficiency of our REST framework. The results of investment simulation show that our framework can achieve a higher return of investment than baselines.
Aerosol 3D Profiling Using Compact Particle Measuring Instruments with Balloon and Drone System
Creators: name: Ahn, Kang-Ho
Publisher: name: Karlsruhe
Year: 2019

description: Aerosol profiling using compact mobile instrument is becoming important for the study of global climate changes, new particle formation, and public health. Manned airplane measurement has been one of the best methods to understand the particles in the high altitude. However, this airplane experiment costs a lot and has some limitations, i.e., no-fly zones, bad weather conditions, low altitude flight limitation, and so on. To overcome some of these limitations, new particle measurement methods have been developed using balloon and drones with miniaturized particle counters. During this research, a light weight optical particle counter (Hy-OPC) with less than 300 g and a compact condensation particle counter (Hy-CPC) with 3.5 nm cut-off size have been developed. These instruments can be operated at low pressure and temperature (-25°C) conditions. A handheld scanning mobility particle sizer (Hy-SMPS) with soft X-ray has also been developed for the new particle formation study with drone and balloon. With these particle instruments, temperature, pressure, GPS, and wind speed and direction sensors are added in the package. A communication system and ground control stations has also been developed. Using these compact instrument package, the aerosol and wind vertical distribution profile has been measured with tethered balloon ( 2 km a.g.l.), sounding balloon ( 8 km a.g.l.), and drones (2.5 km a.g.l.). Some of the particle flux distribution and the new particle formation vertical profile measurement result with Hy-SMPS will be presented.
Strangeness in Neutron Stars
Creators: name: Weber, Fridolin
name: Ho, Alexander
name: Negreiros, Rodrigo P.
name: Rosenfield, Philip
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is generally agreed on that the tremendous densities reached in the centers of neutron stars provide a high-pressure environment in which several intriguing particles processes may compete with each other. These range from the generation of hyperons to quark deconfinement to the formation of kaon condensates and H-matter. There are theoretical suggestions of even more exotic processes inside neutron stars, such as the formation of absolutely stable strange quark matter. In the latter event, neutron stars would be largely composed of strange quark matter possibly enveloped in a thin nuclear crust. This paper gives a brief overview of these striking physical possibilities with an emphasis on the role played by strangeness in neutron star matter, which constitutes compressed baryonic matter at ultra-high baryon number density but low temperature which is no accessible to relativistic heavy ion collision experiments.
description: 16 pages, 5 figures, 3 tables; Accepted for publication in the Proceedings of the International Workshop on Astronomy and Relativistic Astrophysics (IWARA) 2005, Int. J. Mod. Phys. D
Ενοποίηση λειτουργιών ERP και CRM στο πλαισιο μιας επιχειρηματικης αρχιτεκτονικής
Creators: name: Gomori, Elvira Pal
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Ελεύθερο Λογισμικό
Λογισμικό Ανοιχτού Κώδικα
ERP
CRM
Odoo
Free Software
Open Source Software
e-shop
UML diagrams

description: Οι νέες τεχνολογίες αποτελούν εξάρτηση για τις σύγχρονες επιχειρήσεις. Η χρήση τους δίνει σε όλες τις επιχειρήσεις σημαντικό ανταγωνιστικό πλεονέκτημα, ενώ αντίθετα η έλλειψη τους μπορεί να αποβεί μοιραία για μια επιχείρηση και να αποφέρει ακόμα και την λήξη της. Οι επιχειρήσεις επενδύουν σε διάφορα Πληροφοριακά Συστήματα που βοηθούν στην παραγωγή και γενικότερα στη διοίκηση όλης της επιχείρησης. Οι επιχειρήσεις που εγκαθιστούν ERP συστήματα πρέπει να είναι σε θέση να αλλάξουν ριζικά όλες τις διαδικασίες τους και να τις μετατρέψουν ώστε να λειτουργήσει σωστά το νέο σύστημα τους. Η παρούσας διπλωματικής εργασίας ασχολείται με τη μελέτη εφαρμογών ERP και CRM, οι οποίες λύνουν το πρόβλημα με Λογισμικό Ανοιχτού Κώδικα. Κύριος στόχος είναι η ενοποίησης των λειτουργιών ERP και CRM στο πλαίσιο της αρχιτεκτονικής μίας επιχείρησης. Τέλος, παρουσιάζεται ένα ολοκληρωμένο σύστημα ανοικτού κώδικα, που ονομάζεται Odoo, το οποίο θεωρώ ότι εύχρηστο και μπορεί να εφαρμοστεί σε πάρα πολλές Ελληνικές εταιρίες. Υλοποιήθηκε μια πλατφόρμα Odoo Saas (online) για το πειραματικό μέρος της εργασίας αυτής.
description: New technologies are very important for today's businesses and give to all businesses a significant competitive advantage, while the lack of them can be fatal to a business and deliver even their expiration. Businesses investing in various information systems that assist in the production and general management of the entire enterprise. Companies that install ERP systems must be able to change radically all their processes and convert them to properly operate their new systems. This MSc dissertation deals with the study of ERP applications and CRM, which solve the problem with Open Source Software. The main objective is the integration of ERP and CRM functions within the architecture of an enterprise. Finally, a comprehensive open source system called Odoo will be presented, which I find it easy to use and can be applied in many Greek companies. A platform Odoo Saas (online) will be implemented for the experimental part of this work.
Finding Quasars behind the Galactic Plane. I. Candidate Selections with Transfer Learning
Creators: name: Fu, Yuming
name: Wu, Xue-Bing
name: Yang, Qian
name: Brown, Anthony G. A.
name: Feng, Xiaotong
name: Ma, Qinchun
name: Li, Shuyan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Quasars behind the Galactic plane (GPQs) are important astrometric references and useful probes of Milky Way gas. However, the search for GPQs is difficult due to large extinctions and high source densities in the Galactic plane. Existing selection methods for quasars developed using high Galactic latitude (high-$b$) data cannot be applied to the Galactic plane directly because the photometric data obtained from high-$b$ regions and the Galactic plane follow different probability distributions. To alleviate this dataset shift problem for quasar candidate selection, we adopt a Transfer Learning Framework at both data and algorithm levels. At the data level, to make a training set in which dataset shift is modeled, we synthesize quasars and galaxies behind the Galactic plane based on SDSS sources and Galactic dust map. At the algorithm level, to reduce the effect of class imbalance, we transform the three-class classification problem for stars, galaxies, and quasars to two binary classification tasks. We apply XGBoost algorithm on Pan-STARRS1 (PS1) and AllWISE photometry for classification, and additional cut on Gaia proper motion to remove stellar contaminants. We obtain a reliable GPQ candidate catalog with 160,946 sources located at $|b|\leq 20^{\circ}$ in PS1-AllWISE footprint. Photometric redshifts of GPQ candidates achieved with XGBoost regression algorithm show that our selection method can identify quasars in a wide redshift range ($0
description: 28 pages, 15 figures, accepted for publication in ApJS. Table 5 can be downloaded at http://paperdata.china-vo.org/FuYuming/2021/ApJS/GPQ_One/table-05.fits
Landau Potential Study of the Chiral Phase Transition in a QCD-Like Theory
Creators: name: Tsue, Y.
name: Fujii, H.
name: Hashimoto, Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the chiral phase transition of a QCD-like theory, based the shape change of the effective potential near the critical point. The potential is constructed with the auxiliary field method, and a source term coupled to the field is introduced in order to compute the potential shape numerically. We also generalize the potential so as to have two independent order parameters, the quark scalar density and the number density. We find a tri-critical point locating at (T,mu)=(97, 203) MeV, and visualize it as the merging point of three potential minima.
description: 6 pages 4 figures, to appear in a special issue of Int. J. of Mod. Phys. E (the proceedings of the 19th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions: Quark Matter 2006 (QM 2006), Shanghai, China, 14-20 Nov 2006)
Εμπορία από απόσταση χρηματοοικονομικών υπηρεσιών
Creators: name: Θεοχαρίδου, Δήμητρα Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Χρηματοοικονομικές Υπηρεσίες
Απόσταση
Financial Services
DIstance

description: Σκοπός της διατριβής ήταν η μελέτη των ζητημάτων που αφορούν στις συμβάσεις χρηματοοικονομικών υπηρεσιών που πραγματοποιούνται από απόσταση, χωρίς την ταυτόχρονη φυσική παρουσία των συμβαλλομένων, αποκλειστικά με τη χρήση τεχνικών μέσων επικοινωνίας, για παράδειγμα ηλεκτρονικό ταχυδρομείο, τηλέφωνο, φαξ, που ρυθμίζονται στο άρθρο 4θ του νόμου 2251/1994. Εξετάσαμε την υποχρέωση πληροφόρησης του καταναλωτή πριν από τη σύναψη σύμβασης χρηματοοικονομικών υπηρεσιών από απόσταση, την υποχρέωση γνωστοποίησης των συμβατικών όρων, το δικαίωμα υπαναχώρησης του καταναλωτή, τις συνέπειες άσκησης του δικαιώματος υπαναχώρησης. Στη συνέχεια, παρουσιάσαμε αναλυτικά την πληρωμή για υπηρεσίες από απόσταση με κάρτα. Ακόμα, αναφερθήκαμε στην προστασία του καταναλωτή από αθέμιτες εμπορικές πρακτικές. Επιπλέον, ασχοληθήκαμε με άλλες προστατευτικές διατάξεις για τον καταναλωτή και διαπιστώσαμε ποιος φέρει το βάρος απόδειξης για τη λύση της σύμβασης.
description: The aim of the thesis was to study the issues related to financial services contracts conducted by distance without the simultaneous physical presence of the parties, only with the use of technical media, for example e-mail, phone, fax, regulated in Article 4i law 2251/1994. We examined the supplier's obligation to inform the consumer before the contract of financial services at a distance, the obligation to disclose the contract's terms, the consumer's right of withdrawal, the consequences of exercising the right of withdrawal. Then we presented in detail the payment of financial services at a distance by card. Still, we referred to the protection of consumers against unfair commercial practices. In addition, we worked with other protective devices for consumers and found who bears the burden of proof for the termination of the contract.
Faraday rotations, ellipticity and circular dichroism in the magneto-optical spectrum of moiré superlattices
Creators: name: Crosse, J. A.
name: Moon, Pilkyung
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the magneto-optical conductivity of a number of Van der Waals heterostructures, namely, twisted bilayer graphene, AB-AB and AB-BA stacked twisted double bilayer graphene and monolayer graphene and AB-stacked bilayer graphene on hexagonal boron nitride. As magnetic field increases, the absorption spectrum exhibits a self-similar recursive pattern reflecting the fractal nature of the energy spectrum. Whilst twisted bilayer graphene displays only weak circular dichroism, monolayer graphene and AB-stacked bilayer graphene on hexagonal boron nitride show specifically strong circular dichroism, owing to strong inversion symmetry breaking properties of the hexagonal boron nitride layer. As, the left and right circularly polarized light interact with these structures differently, plane polarized incident light undergoes a Faraday rotation and gains an ellipticity when transmitted. The size of the respective angles is on the order of a degree.
description: 24 pages, 9 figures
D4.2 Functional Safety
Creators: name: MARBEL partners
Publisher: name: Zenodo
Year: 2021

description: This deliverable includes the requirements in order to develop a BMS according to the automotive ISO 26262 (Functional safety) standard. It is focused on concept phase development activities (Item definition, Hazard and Risk Assessment and Functional Safety Concept) for the BMS item. A preliminary technical Safety Concept derived from the Functional Safety Concept is defined in order to guide the following BMS development phases. A summary of the ISO 26262 sections related to process and activities is also provided, highlighting key aspects.
description: MARBEL project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 963540
Η δικαστική προστασία σε διαφορές που αναφύονται πριν τη σύναψη δημοσίων συμβάσεων Ν. 3886/2010
Creators: name: Κωνσταντιάδου, Ασημένια Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Δημόσιο δίκαιο
Δημόσιες συμβάσεις
Δικαστική προστασία
Public law
Public contracts
Judicial protection

description: Το θέμα της εργασίας είναι η παρεχόμενη στους διαγωνιζόμενους δικαστική προστασία σε διαφορές που αναφύονται πριν τη σύναψη δημοσίων συμβάσεων όπως προβλέπεται από το Ν. 3886/2010. Αρχικά, παρουσιάζονται τα ιδιαίτερα χαρακτηριστικά γνωρίσματα του ειδικού δικονομικού καθεστώτος το οποίο ο νόμος αυτός εισήγαγε στην εγχώρια έννομη τάξη που οφείλονται κυρίως στην ενωσιακή καταβολή των κανόνων και στο γεγονός ότι οι διαφορές εκδικάζονται με το σύστημα της ενιαίας δικαιοδοσίας. Επιπλέον, εξετάζονται τα προβλεπόμενα από το νόμο ένδικα βοηθήματα δικαστικής προστασίας των διαγωνιζόμενων και αναδεικνύονται οι ιδιαιτερότητές τους σε σχέση με τα κλασσικά ένδικα βοηθήματα του διοικητικού δικονομικού δικαίου.
description: The subject of the present thesis is the judicial protection of tenants in disputes produced before the conclusion of public contracts, as provided by the law 3886/2010. At first, the thesis presents the main features of this special procedural system that the law introduces in the domestic legal order which is initiated mainly by the origin of the rules and the fact that the disputes are solved within the framework of joined jurisdiction. Furthermore, it examines the legal remedies provided by the law for the judicial protection of tenders and underlines their special caracteristics regarding to those provided by the provisions of public procedural law.
Simultaneous eROSITA and TESS observations of the ultra-active star AB~Doradus
Creators: name: Schmitt, J. H. M. M.
name: Ioannidis, P.
name: Robradel, J.
name: Predehl, P.
name: Czesla, S.
name: Schneider, P. C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present simultaneous multiwavelength observations of the ultra-active star AB~Doradus obtained in the X-ray range with the eROSITA instrument on board the Russian--German Spectrum-Roentgen-Gamma mission (SRG), and in the optical range obtained with the Transiting Exoplanet Survey Satellite (TESS). Thanks to its fortuitous location in the vicinity of the southern ecliptic pole, AB~Dor was observed by these missions simultaneously for almost 20 days. With the hitherto obtained data we study the long-term evolution of the X-ray flux from AB~Dor and the relation between this observable and the photospheric activity of its spots. Over the 1.5 years of eROSITA survey observations, the "quiescent" X-ray flux of AB~Dor has not changed, and furthermore it appears unrelated to the photospheric modulations observed by TESS. During the simultaneous eROSITA and TESS coverage, an extremely large flare event with a total energy release of at least 4 $\times$ 10$^{36}$ erg in the optical was observed, the largest ever seen on AB~Dor. We show that the total X-ray output of this flare was far smaller than this, and discuss whether this maybe a general feature of flares on late-type stars.
description: To appear on A&A, Special Issue: The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the SRG Mission
Topological aspects of quantum spin Hall effect in graphene: Z$_2$ topological order and spin Chern number
Creators: name: Fukui, T.
name: Hatsugai, Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: For generic time-reversal invariant systems with spin-orbit couplings, we clarify a close relationship between the Z$_2$ topological order and the spin Chern number proposed by Kane and Mele and by Sheng {\it et al.}, respectively, in the quantum spin Hall effect. It turns out that a global gauge transformation connects different spin Chern numbers (even integers) modulo 4, which implies that the spin Chern number and the Z$_2$ topological order yield the same classification. We present a method of computing spin Chern numbers and demonstrate it in single and double plane of graphene.
description: 5 pages, 3 figures