cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Μελέτη με προσομοίωση Monte Carlo της επίδρασης των τεχνικών παραμέτρων αξονικού τομογράφου διπλής πηγής-διπλής ενέργειας στην ποιότητα εικόνας και στη δόση με σκοπό τη δημιουργία σύγχρονου εκπαιδευτικού εργαλείου
Creators: name: Χαντζή, Στεφανία Λ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Υπολογιστικός τομογράφος διπλής πηγής – διπλής ενέργειας
Προσομοίωση Monte Carlo
Δόση και ποιότητα εικόνας
Εκπαιδευτικό εργαλείο
Dual source - dual energy computed tomography scanner
Monte Carlo simulation
Dose and image quality
Educational tool

description: Στην παρούσα μελέτη προσομοιώθηκε ο υπολογιστικός τομογράφος διπλής πηγής-διπλής ενέργειας με σκοπό τη διερεύνηση της χρήσης του ως εργαλείο δοσιμετρίας καθώς και το σχεδιασμό εκπαιδευτικών σεναρίων στην Ιατρική Φυσική. Στόχος της προσομοίωσης του συστήματος, με βάση τον κώδικα μεταφοράς ακτινοβολίας Monte Carlo N-particle (MCNP), ήταν η κατασκευή ενός μοντέλου που να προσεγγίζει σε ικανοποιητικό βαθμό και με αξιοπιστία το πραγματικό σύστημα. Η προσομοίωση του συγκεκριμένου τομογράφου είχε σκοπό τη δημιουργία σύγχρονου εκπαιδευτικού εργαλείου. Για την επίτευξη αυτού του σκοπού υλοποιήθηκαν και αξιολογήθηκαν προβληματο-κεντρικά σενάρια σχετικά με τη δοσιμετρία και την επίδραση τεχνικών παραμέτρων στην ποιότητα της εικόνας. Ο σχεδιασμός και η ανάπτυξη των εκπαιδευτικών σεναρίων έγινε με τη χρήση του καινοτόμου συστήματος OpenLabyrinth.
description: In the present study, a Dual-Source Computed Tomography (DSCT) scanner was simulated in order to examine the possibility of using it as a dosimetric tool and to create educational scenarios in Medical Physics. The aim of the system simulation, based on the Monte Carlo N-particle radiation code (MCNP), was to develop a model that approximates the actual system reliably. The simulation of a DSCT scanner could provide a powerful tool for dose assessment and support the training of clinical scientists in the imaging performance characteristics of Computed Tomography. Subsequently, problem-based scenarios for dosimetry and study of technical parameters on image quality were implemented and evaluated. The design and development of problem-based scenarios with the use of OpenLabyrinth targeted at the creation of a modern educational tool in Medical Physics.
Empirical Study of Multi-Task Hourglass Model for Semantic Segmentation Task
Creators: name: Saire, Darwin
name: Rivera, Adín Ramírez
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The semantic segmentation (SS) task aims to create a dense classification by labeling at the pixel level each object present on images. Convolutional neural network (CNN) approaches have been widely used, and exhibited the best results in this task. However, the loss of spatial precision on the results is a main drawback that has not been solved. In this work, we propose to use a multi-task approach by complementing the semantic segmentation task with edge detection, semantic contour, and distance transform tasks. We propose that by sharing a common latent space, the complementary tasks can produce more robust representations that can enhance the semantic labels. We explore the influence of contour-based tasks on latent space, as well as their impact on the final results of SS. We demonstrate the effectiveness of learning in a multi-task setting for hourglass models in the Cityscapes, CamVid, and Freiburg Forest datasets by improving the state-of-the-art without any refinement post-processing.
description: To appear in IEEE Access. Code available at https://gitlab.com/mipl/mtl-ss
บุพปัจจัยและผลลัพธ์ของการได้เงินทุนเริ่มต้นและเงินทุนพัฒนาของผู้ประกอบการวิสาหกิจขนาดย่อม The Antecedents and Outcomes of Acquiring Start-up and Development Capital for Small Entrepreneurs
Creators: name: สุกฤตา สุวรรณกฤติ
name: สุชาติ ประสิทธิ์รัฐสินธุ์
name: เจมส์ แลนแคสเตอร์
Publisher: name: โครงการปรัชญาดุษฎีบัณฑิตการพัฒนาการบริหาร มหาวิทยาลัยปทุมธานี
Year: 2556
Subjects: บุพปัจจัย ,ผลลัพธ์ ,เงินทุนเริ่มต้น ,เงินทุนพัฒนา, วิสาหกิจขนาดย่อม ,Antecedents, outcomes, acquiring Start-up, development capital, SME

description: ฉบับที่ 1, ปีที่ 6, วารสารการวิจัยการพัฒนาการบริหาร
การรับรู้วิชาชีพประชาสัมพันธ์ของประชาชนในเขตกรุงเทพฯ และปริมณฑล
Creators: name: ประทุม ฤกษ์กลาง
Publisher: name: สมาคมนักวิจัย
Year: 2554
Subjects: การรับรู้ วิชาชีพประชาสัมพันธ์,บทบาทหน้าที่,การดำเนินงาน,บุคลิกภาพ,จรรยาบรรณ

description: 3, 16, วารสารสมาคมนักวิจัย
A new approach of estimating the Galactic thermal dust and synchrotron polarized emission template in the microwave bands
Creators: name: Adak, Debabrata
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Internal Linear Combination (ILC) method has been extensively used to extract the cosmic microwave background (CMB) anisotropy map from foreground contaminated multi-frequency maps. However, the performance of simple ILC is limited and can be significantly improved by heavily constraint equations, dubbed cILC. The standard ILC and cILC works on the spin-0 field. Recently, a generalized version of ILC is developed to estimate polarization maps in which the quantity $Q \pm iU$ is combined at multiple frequencies using complex coefficients called Polarization ILC (PILC). A statistical moment expansion method has recently been developed for high precision modelling of the Galactic foregrounds. This paper develops a semi-blind component separation method combining the moment approach of foreground modelling with a generalized version of the PILC method for heavily constraint equations. The algorithm is developed in pixel space and performs for a spin-2 field. We employ this component separation technique in simultaneous estimation of Stokes $Q$, $U$ maps of the thermal dust at 353 GHz and synchrotron at 30 GHz over 78 % of the sky. We demonstrate the performance of the method on three sets of absolutely calibrated simulated maps at WMAP and planck frequencies with varying foreground models.
description: 23 pages, 16 figures, Submitted to MNRAS
ผลกระทบของการใช้เถ้าแกลบผสมเถ้าลอยต่อคุณสมบัติเชิงกลของคอนกรีต
Creators: name: สาโรจน์  ดำรงศีล
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลรัตนโกสินทร์
Year: 2015
Subjects: เถ้าแกลบ, เถ้าลอย, คอนกรีต

description: 1, 9, วารสารวิชาการและวิจัย มทร.พระนคร
การออกแบบและพัฒนาโปรแกรมคำนวณค่าความเข้มสนามแม่เหล็กของสายส่งและสายจำหน่ายแรงสูง
Creators: name: ประภาพรรณ  เคลือบวัณณรัตน์
Publisher: name: มหาวิทยาลัยเอเชียอาคเนย์
Year: 2015
Subjects: ความเข้มสนามแม่เหล็ก, สายส่ง, สายจำหน่าย

description: 1, 9, วารสารวิชาการและวิจัย มทร.พระนคร
มองปัญหาชายแดนใต้ผ่านผู้นำชุมชนมุสลิม
Creators: name: ศิริวุฒิ  วรรณทอง
Publisher: name: วิทยาลัยเทคโนโลยีภาคใต้
Year: 2551

description: 1, 1, วารสารเทคโนโลยีภาคใต้
Η προστασία του καταναλωτή-αποδέκτη τουριστικών υπηρεσιών με επικέντρωση στην ταξιδιωτική σύμβαση
Creators: name: Καρδούλια, Ευανθία A.
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Kαταναλωτής
Προστασία
Ταξιδιώτης
Οργανωμένο ταξίδι
Consumer
Protection
Traveller
Package travel

description: Σκοπός της διδακτορικής διατριβής ήταν η μελέτη της προστασίας μιας συγκεκριμένης κατηγορίας καταναλωτών, αυτών που γίνονται αποδέκτες τουριστικών υπηρεσιών, δηλαδή των τουριστών. Η έρευνα επικεντρώθηκε, παραδειγματικά, σε μία ειδική συμβατική μορφή, τη λεγόμενη «σύμβαση οργανωμένου ταξιδιού» και σε μία ειδική μορφή τουρίστα-καταναλωτή, τον «ταξιδιώτη» ο οποίος συνάπτει σύμβαση οργανωμένου ταξιδιού. Στο πλαίσιο της διατριβής, παρουσιάσαμε αναλυτικά τις έννοιες του καταναλωτή και του τουρίστα και το πεδίο προστασίας τους. Στη συνέχεια, αναφερθήκαμε στην προστασία του καταναλωτή που καταρτίζει σύμβαση οργανωμένου ταξιδιού, υπό το προϊσχύσαν νομοθετικό πλαίσιο, και αναλύσαμε την προστασία του ταξιδιώτη που καταρτίζει σύμβαση οργανωμένου ταξιδιού, υπό το ισχύον νομοθετικό πλαίσιο. Προχωρήσαμε σε μια παρουσίαση και κριτική των σημαντικότερων ρυθμίσεων του Προεδρικού Διατάγματος 7/2018 «Εναρμόνιση νομοθεσίας με Οδηγία (ΕΕ) 2015/2302 σχετικά με τα οργανωμένα ταξίδια και τους συνδεδεμένους ταξιδιωτικούς διακανονισμούς», υπό το πρίσμα της προστασίας του ταξιδιώτη. Ερευνήσαμε, τέλος, εάν το υπάρχον νομικό πλαίσιο προστασίας του ταξιδιώτη, ως ασθενέστερου μέρους της σύμβασης οργανωμένου ταξιδιού, είναι επαρκές για να του παράσχει ουσιαστική προστασία και αν διαπιστώνεται νομικός κηδεμονισμός στο πεδίο της προστασίας του ταξιδιώτη.
description: The purpose of the present doctoral thesis was to study the protection of a specific category of consumers, those who become recipients of tourist services, i.e. the tourists. The study focused on a special contractual form, namely the so-called "package travel contract" and on a special type of tourist-consumer, i.e. the "traveler" who concludes a package travel contract. In the context of the doctoral thesis, we presented in detail the notion and the scope of protection of both the consumer and the tourist. We also examined the protection of the consumer who concluded a package travel contract under the previous legal framework, and analyzed the protection of the traveler who concluded such contract under the current legal framework. We proceeded with a presentation and a critical analysis of the most important provisions of the Presidential Decree 7/2018 "Harmonization of legislation with Directive (EU) 2015/2302 on package travel and linked travel arrangements", in the light of the protection of the traveler. Lastly, we examined whether the current legal framework governing the protection of the traveler, as the weakest part of the package travel contract, is sufficient to provide him with substantial protection and whether there is legal paternalism in the field of traveler protection.
title: Corrosion Resistance and Microstructure of Welded Duplex Stainless Steel Surface Layers on Gray Cast Iron
Creators: name: Heider, B.
name: Oechsner, M.
name: Reisgen, U.
name: Ellermeier, J.
name: Engler, T.
name: Andersohn, G.
name: Sharma, R.
name: Gonzalez Olivares, E.
name: Zokoll, E.
Publisher: name: Springer
Year: 2024

description: The degradation of pump components by corrosion and complex, simultaneous damage mechanisms, e.g., erosion–corrosion and cavitation–corrosion leads to high costs through replacement and maintenance of parts. To increase the lifetime of cost-efficient components with superior casting properties, surface welding of duplex stainless steel on gray cast iron parts was performed using inert shielding gas metal arc surface welding (GMA-SW) and plasma transferred arc surface welding (PTA-SW). The thermal conductivity of the used shielding gas and the preheating temperature influenced the dilution of the surface layers, which had a major impact on the corrosion resistance and the microstructure. Lower cooling rates enhanced diffusion and lead to precipitation of carbides. High heat input and prolonged cooling times during surface welding resulted in high dilution and a carbide network. The corrosion resistance in artificial seawater of those surface layers was substantially reduced compared to surface layers with lower heat input and higher cooling rates. The corrosion of the surface layers in the potentiodynamic polarization test was driven by selective corrosion of the phase boundary between Cr–carbides and Cr–depleted austenite. Passive behavior was observed for surface layers with low dilution, which had homogeneous chromium distribution and no carbide networks. In conclusion, the corrosion behavior of gray cast iron was improved by surface welding with duplex stainless steel. The corrosion resistance of the surface layers produced with PTA-SW with no preheating exceeded that of the surface layers produced with GMA-SW and came close to those of a commercially available duplex stainless steel used as reference material.
Essential System Services in Grids Dominated by Renewable Energy
Creators: name: Lal, Niraj
name: Price, Toby
name: Kwek, Leon
name: Wilson, Christopher
name: Billimoria, Farhad
name: Morrow, Trent
name: Garbutt, Matt
name: Sharafi, Dean
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: As the proportion of variable inverter-based renewable energy generation in electricity systems increases from a minority to the majority of total supply, the complexity and cost of providing ancillary system services increases in parallel. Australia is experiencing this shift now - from having the third most carbon-intensive electricity sector in the world in 2010, to now having penetrations of variable renewable energy (VRE) regularly reaching 100 percent in some regions, with world-leading uptake of distributed energy resources (DER). This paper presents pioneering work exploring new technical, economic and regulatory frameworks for the provision of Essential System Services (ESS), also known as ancillary services, in power systems dominated by variable inverter-based renewable energy resources. We explore the recent application of the concept of demand curves and nomograms to the procurement of ESS, and emerging design principles for frameworks in facilitating the evolution from default provision of system services by synchronous generation, to co-optimisation of services through unit commitment, to independent provision of services through inverter based resources. The paper also analyses the recent technical and financial success of the world's largest battery, the Hornsdale Power Reserve in South Australia, and its ability to inform how future electricity market frameworks may incentivize and accommodate new technological capability, both first and Nth of a kind systems. Finally, the paper reviews emerging energy system technological capability, including the provision of synthetic inertia and RoCoF control, grid-forming inverters, and advanced DER aggregation in providing ESS and system restart capability for secure, resilient and island-able grids.
description: 26 pages, 8 figures
Photoinduced multistage phase transitions in Ta2NiSe5
Creators: name: Liu, Q. M.
name: Wu, D.
name: Li, Z. A.
name: Shi, L. Y.
name: Wang, Z. X.
name: Zhang, S. J.
name: Lin, T.
name: Hu, T. C.
name: Tian, H. F.
name: Li, J. Q.
name: Dong, T.
name: Wang, N. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Utrafast control of material physical properties represents a rapid developing field in condensed matter physics. Yet, accessing to the long-lived photoinduced electronic states is still in its early stage, especially with respect to an insulator to metal phase transition. Here, by combing transport measurement with ultrashort photoexcitation and coherent phonon spectroscopy, we report on photoinduced multistage phase transitions in Ta2NiSe5. Upon excitation by weak pulse intensity, the system is triggered to a short-lived state accompanied by a structural change. Further increasing the excitation intensity beyond a threshold, a photoinduced steady new state is achieved where the resistivity drops by more than four orders at temperature 50 K. This new state is thermally stable up to at least 350 K and exhibits the lattice structure different from any of the thermally accessible equilibrium states. Transmission electron microscopy reveals an in-chain Ta atom displacement in the photoinduced new structure phase. We also found that nano-sheet samples with the thickness less than the optical penetration depth are required for attaining a complete transition.
description: 10 pages, 4 figures, accepted by Nature Communications
Semantic Consistency and Identity Mapping Multi-Component Generative Adversarial Network for Person Re-Identification
Creators: name: Khatun, Amena
name: Denman, Simon
name: Sridharan, Sridha
name: Fookes, Clinton
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In a real world environment, person re-identification (Re-ID) is a challenging task due to variations in lighting conditions, viewing angles, pose and occlusions. Despite recent performance gains, current person Re-ID algorithms still suffer heavily when encountering these variations. To address this problem, we propose a semantic consistency and identity mapping multi-component generative adversarial network (SC-IMGAN) which provides style adaptation from one to many domains. To ensure that transformed images are as realistic as possible, we propose novel identity mapping and semantic consistency losses to maintain identity across the diverse domains. For the Re-ID task, we propose a joint verification-identification quartet network which is trained with generated and real images, followed by an effective quartet loss for verification. Our proposed method outperforms state-of-the-art techniques on six challenging person Re-ID datasets: CUHK01, CUHK03, VIPeR, PRID2011, iLIDS and Market-1501.
description: Accepted in WACV 2020
Pulse shaping for on-demand emission of single Raman photons from a quantum-dot biexciton
Creators: name: Praschan, Tom
name: Heinze, Dirk
name: Breddermann, Dominik
name: Zrenner, Artur
name: Walther, Andrea
name: Schumacher, Stefan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Semiconductor quantum dots embedded in optical cavities are promising on-demand sources of single photons. Here, we theoretically study single photon emission from an optically driven two-photon Raman transition between the biexciton and the ground state of a quantum dot. The advantage of this process is that it allows all-optical control of the properties of the emitted single photon with a laser pulse. However, with the presence of other decay channels and excitation-induced quantum interference, on-demand emission of the single Raman photon is generally difficult to achieve. Here we show that laser pulses with non-trivial shapes can be used to maintain excitation conditions for which with increasing pulse intensities the on-demand regime is reached. To provide a realistic picture of the achievable system performance, we include phonon-mediated processes in the theoretical caluclations. While preserving both high photon purity and indistinguishability, we find that although based on a higher-order emission process, for realistic system parameters on-demand Raman photon emission is indeed achievable with suitably tailored laser pulses.
Online Dispute Resolution: The Perspective of Service Providers
Creators: name: Giacalone, Marco
name: Salehi, Seyedeh Sajedeh
Publisher: name: Zenodo
Year: 2019
Subjects: Online Dispute Resolution (ODR), E-negotiation, E-mediation, ODR Platforms, EU

description: The current study examines the application of Online Dispute Resolution (ODR) with the specific focus on resolving civil disputes. For that purpose, this paper initially provides an introduction to the concept of ODR clarifying the major distinguishing characteristics which differentiate ODR from ADR. Next, the study will provide a thorough overview on two types of ODR namely, E-Negotiation and E-Mediation followed by arguing the applicability of these two principles into the ODR field in the global context. Finally, this paper will analyse the establishment and implementation of the EU ODR platform which was launched by the EU Commission to improve the efficiency of conflict resolution between traders and consumers through providing them with access to quality dispute resolution mechanisms procured by dispute resolution bodies.
Stokes manifolds and cluster algebras
Creators: name: Bertola, Marco
name: Tarricone, Sofia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Symplectic Geometry (math.SG)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Stokes' manifolds, also known as wild character varieties, carry a natural symplectic structure. Our goal is to provide explicit log-canonical coordinates for these natural Poisson structures on the Stokes' manifolds of polynomial connections of rank $2$, thus including the second Painlevé\ hierarchy. This construction provides the explicit linearization of the Poisson structure first discovered by Flaschka and Newell and then rediscovered and generalized by Boalch. We show that, for a connection of degree $K$, the Stokes' manifold is a cluster manifold of type $A_{2K}$. The main idea is then applied to express explicitly also the log--canonical coordinates for the Poisson bracket introduced by Ugaglia in the context of Frobenius manifolds and then also applied by Bondal in the study of the symplectic groupoid of quadratic forms.
description: 35 pages, 11 figures
Atomic structure analysis of nanocrystalline Boehmite AlO(OH)
Creators: name: Bruehne, Stefan
name: Gottlieb, Saskia
name: Assmus, Wolf
name: Alig, Edith
name: Schmidt, Martin U.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Nanocrystalline n-AlO(OH) (Disperal P2(R) of Sasol) was investigated by means of the atomic pair distribution function (PDF). The PDF is derived from powder diffraction data, an ideally resolved PDF is obtained from a synchrotron source which provides a large maximal scattering vector length Qmax > 300 nm-1. Here, however, we were able to reveal atomic structure details of the about 4 nm particles from in-house diffraction data (Qmax = 130 nm-1): PDF least squares model refinements show that n-AlO(OH) is of the layered Boehmite structure type (oC16, Cmcm). But the structure is uniformly distorted in domains of ca. 2 nm size within the nano particles. The hydrogen bonds between the layers are widened up significantly by +13 pm, accounting for the higher reactivity when compared to microcrystalline Boehmite. Our results from only one "nanocrystallographic" experiment are consistent with a trend which was found via the Rietveld technique on a series of AlO(OH) of different crystallite size (Bokhimi et al., 2001). In addition, the PDF contains information on structural distortion as a function of (coherence) domain size within the nano particles.
Large dust fractions can prevent the propagation of soundwaves
Creators: name: David--Cléris, Timothée
name: Laibe, Guillaume
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Dust plays a central role in several astrophysical processes. Hence the need of dust/gas numerical solutions, and analytical problems to benchmark them. In the seminal dustywave problem, we discover a regime where sound waves can not propagate through the mixture above a large critical dust fraction. We characterise this regime analytically, making it of use for testing accuracy of numerical solvers at large dust fractions.
description: Accepted for publication in MNRAS
title: Giant cell arteritis: about one case at Vierzon Hospital Center, France and literature review
title: Artérite à cellule géante : à propos d’un cas au Centre hospitalier de Vierzon, France et revue de littérature
Creators: name: Adébayo Alassani
Publisher: name: Revue Marocaine de Rhumatologie (RMR)
Year: 2023

description: Giant cell arteritis, formerly known as Horton's disease, is a rare vasculitis affecting the elderly subject and preferentially affecting the large vessels. The manifestations are polymorphic, some of which can be fatal and/or functional. Here we report the case of a 76-year-old woman who presented with unilateral eye pain and whose diagnosis was confirmed by ultrasound and temporal artery biopsy. Under corticosteroid therapy, the evolution is favorable. An overview of the latest literature data on the diagnosis and management of giant cell arteritis is presented.
description: L’artérite à cellule géante anciennement appelée maladie de Horton est une vascularite rare intéressant les sujets âgés et affectant préférentiellement les gros vaisseaux. Les manifestations sont polymorphes dont certaines peuvent engager le pronostic vital et ou fonctionnel. Nous rapportons ici un cas chez une dame âgé de 76 ans qui présentait une douleur oculaire unilatérale et dont le diagnostic a été confirmé par l’échographie et la biopsie de l’artère temporale. Sous corticothérapie, l’évolution est favorable. Un aperçu des dernières données de la littérature sur le diagnostic et la prise en charge de l’artérite à cellules géantes est abordé.
title: Overconfidence and the Political and Financial Behavior of a Representative Sample
Creators: name: Bosch-Rosa, Ciril
name: Kassner, Bernhard
name: Ahrens, Steffen
Publisher: name: Hertie School
Year: 2024

description: We study the relationship between overconfidence and the political and financial behavior of a nationally representative sample. Consistent with theoretical predictions, our findings indicate that excessive confidence in one's judgment is associated with lower portfolio diversification, greater stock price forecasting errors, and more extreme political views. We also find that overconfidence correlates with an increased likelihood of voting absenteeism. Importantly, our analysis bridges the gap between the financial and political literature by showing that overprecision-induced behavior in the financial domain is associated with overprecise behavior in the political domain, and vice versa. In a companion survey that elicits overconfidence across various knowledge domains, we further show that overconfidence is consistent within respondents and across knowledge domains. All of these findings suggest that overconfidence is a pervasive bias that permeates many aspects of people's lives.
description: Berlin School of Economics Discussion Papers; 51
Continuity properties and infinite divisibility of stationary distributions of some generalized Ornstein--Uhlenbeck processes
Creators: name: Lindner, Alexander
name: Sato, Ken-iti
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: Properties of the law $μ$ of the integral $\int_0^{\infty}c^{-N_{t-}}\,dY_t$ are studied, where $c>1$ and $\{(N_t,Y_t),t\geq0\}$ is a bivariate Lévy process such that $\{N_t\}$ and $\{Y_t\}$ are Poisson processes with parameters $a$ and $b$, respectively. This is the stationary distribution of some generalized Ornstein--Uhlenbeck process. The law $μ$ is parametrized by $c$, $q$ and $r$, where $p=1-q-r$, $q$, and $r$ are the normalized Lévy measure of $\{(N_t,Y_t)\}$ at the points $(1,0)$, $(0,1)$ and $(1,1)$, respectively. It is shown that, under the condition that $p>0$ and $q>0$, $μ_{c,q,r}$ is infinitely divisible if and only if $r\leq pq$. The infinite divisibility of the symmetrization of $μ$ is also characterized. The law $μ$ is either continuous-singular or absolutely continuous, unless $r=1$. It is shown that if $c$ is in the set of Pisot--Vijayaraghavan numbers, which includes all integers bigger than 1, then $μ$ is continuous-singular under the condition $q>0$. On the other hand, for Lebesgue almost every $c>1$, there are positive constants $C_1$ and $C_2$ such that $μ$ is absolutely continuous whenever $q\geq C_1p\geq C_2r$. For any $c>1$ there is a positive constant $C_3$ such that $μ$ is continuous-singular whenever $q>0$ and $\max\{q,r\}\leq C_3p$. Here, if $\{N_t\}$ and $\{Y_t\}$ are independent, then $r=0$ and $q=b/(a+b)$.
description: Published in at http://dx.doi.org/10.1214/08-AOP402 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Canadian natural gas deregulation
Creators: name: Black, Alexander Joseph
Publisher: name: University of British Columbia
Year: 2010

description: Canadian natural gas deregulation has terminated government price setting in favour of prices determined by market forces. However, the transportation of the commodity remains regulated due to the monopolistic nature of the distribution system and the Canadian economies of scale which preclude business rivalry. This paper attempts to discern whether the transition to a new regime is following the legal principles underlying public utility regulation. Promotion of the public interest is therefore a pervasive theme of this paper. While regulatory law allows certain forms of discrimination in the setting of rates and the provision of services, it prohibits undue or unjust discrimination. The thesis proposed herein focuses on regulatory theory and the possibility that incidents of undue discrimination may have been exacerbated by the deregulation process. The examination begins with a review of the discrimination provisions of section 92A of the Constitution Act 1867, the so-called "Resource Amendment". More attention is directed to public utilities theory given its compelling application to the natural gas industry. Deregulation is then discussed including an analysis of "direct sale" contracts involving the commodity as well as the "bypass" of the local pipeline distribution systems. Some conclusions are then made concerning competition and changing commercial conditions. Grave doubts are voiced as to whether the National Energy Board is properly applying the principles of public utility regulation during the transition to a more market oriented natural gas environment. One important conclusion is that direct sale contracts should be encouraged in the core market as well as in the industrial market by the National Energy Board in order to promote upstream competition among gas producers in the public interest. Finally, it is hoped that these doubts will be resolved by the Board in its new (RH-1-88) public hearing which will address issues related to deregulation, including direct sales and the ancillary self-displacement and operating demand volume (ODV) methodology.
Discretely Holomorphic Parafermions in Lattice Z(N) Models
Creators: name: Rajabpour, M. A.
name: Cardy, John
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct lattice parafermions - local products of order and disorder operators - in nearest-neighbor Z(N) models on regular isotropic planar lattices, and show that they are discretely holomorphic, that is they satisfy discrete Cauchy-Riemann equations, precisely at the critical Fateev-Zamolodchikov (FZ) integrable points. We generalize our analysis to models with anisotropic interactions, showing that, as long as the lattice is correctly embedded in the plane, such discretely holomorphic parafermions exist for particular values of the couplings which we identify as the anisotropic FZ points. These results extend to more general inhomogeneous lattice models as long as the covering lattice admits a rhombic embedding in the plane.
description: v2: minor corrections; v3: published version - minor corrections and reference added
On Walkup's class ${\cal K}(d)$ and a minimal triangulation of $(S^3 \times \rotatebox{90}{\ltimes} S^1)^{\#3}$
Creators: name: Bagchi, Bhaskar
name: Datta, Basudeb
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 57Q15, 57R05

description: For $d \geq 2$, Walkup's class ${\cal K}(d)$ consists of the $d$-dimensional simplicial complexes all whose vertex-links are stacked $(d-1)$-spheres. Kalai showed that for $d \geq 4$, all connected members of ${\cal K}(d)$ are obtained from stacked $d$-spheres by finitely many elementary handle additions. According to a result of Walkup, the face vector of any triangulated 4-manifold $X$ with Euler characteristic $χ$ satisfies $f_1 \geq 5f_0 - {15/2} χ$, with equality only for $X \in {\cal K}(4)$. Kühnel observed that this implies $f_0(f_0 - 11) \geq -15χ$, with equality only for 2-neighborly members of ${\cal K}(4)$. Kühnel also asked if there is a triangulated 4-manifold with $f_0 = 15$, $χ= -4$ (attaining equality in his lower bound). In this paper, guided by Kalai's theorem, we show that indeed there is such a triangulation. It triangulates the connected sum of three copies of the twisted sphere product $S^3 \times {-2.8mm}_{-} S^1$. Because of Kühnel's inequality, the given triangulation of this manifold is a vertex-minimal triangulation. By a recent result of Effenberger, the triangulation constructed here is tight. Apart from the neighborly 2-manifolds and the infinite family of $(2d+ 3)$-vertex sphere products $S^{d-1} \times S^1$ (twisted for $d$ odd), only fourteen tight triangulated manifolds were known so far. The present construction yields a new member of this sporadic family. We also present a self-contained proof of Kalai's result.
description: To appear in `Discrete Mathematics'
Exact density matrix of the Gutzwiller wave function: II. Minority spin component
Creators: name: Narayan, Onuttom
name: Kuramoto, Yoshio
name: Arikawa, Mitsuhiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The density matrix, i.e. the Fourier transform of the momentum distribution, is obtained analytically for all magnetization of the Gutzwiller wave function in one dimension with exclusion of double occupancy per site. The present result complements the previous analytic derivation of the density matrix for the majority spin. The derivation makes use of a determinantal form of the squared wave function, and multiple integrals over particle coordinates are performed with the help of a diagrammatic representation. In the thermodynamic limit, the density matrix at distance x is completely characterized by quantities v_c x and v_s x, where v_s and v_c are spin and charge velocities in the supersymmetric t-J model for which the Gutzwiller wave function gives the exact ground state. The present result then gives the exact density matrix of the t-J model for all densities and all magnetization at zero temperature. Discontinuity, slope, and curvature singularities in the momentum distribution are identified. The momentum distribution obtained by numerical Fourier transform is in excellent agreement with existing result.
description: 20 pages, 10 figures
The Afterglows of Swift-era Gamma-Ray Bursts II.: Type I GRB versus Type II GRB Optical Afterglows
Creators: name: Kann, D. A.
name: Klose, S.
name: Zhang, B.
name: Covino, S.
name: Butler, N. R.
name: Malesani, D.
name: Nakar, E.
name: Wilson, A. C.
name: Antonelli, L. A.
name: Chincarini, G.
name: Cobb, B. E.
name: D'Avanzo, P.
name: D'Elia, V.
name: Della Valle, M.
name: Ferrero, P.
name: Fugazza, D.
name: Gorosabel, J.
name: Israel, G. L.
name: Mannucci, F.
name: Piranomonte, S.
name: Schulze, S.
name: Stella, L.
name: Tagliaferri, G.
name: Wiersema, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use a large sample of GRB afterglow and prompt-emission data (adding further GRB afterglow observations in this work) to compare the optical afterglows (or the lack thereof) of Type I GRBs with those of Type II GRBs. In comparison to the afterglows of Type II GRBs, we find that those of Type I GRBs have a lower average luminosity and show an intrinsic spread of luminosities at least as wide. From late and deep upper limits on the optical transients, we establish limits on the maximum optical luminosity of any associated supernova, confirming older works and adding new results. We use deep upper limits on Type I GRB optical afterglows to constrain the parameter space of possible mini-SN emission associated with a compact-object merger. Using the prompt emission data, we search for correlations between the parameters of the prompt emission and the late optical afterglow luminosities. We find tentative correlations between the bolometric isotropic energy release and the optical afterglow luminosity at a fixed time after trigger (positive), and between the host offset and the luminosity (negative), but no significant correlation between the isotropic energy release and the duration of the GRBs. We also discuss three anomalous GRBs, GRB 060505, GRB 060614, and GRB 060121, in the light of their optical afterglow luminosities. (Abridged)
description: Re-submitted to ApJ; 56 pages in emulateapj format; strongly expanded and revised in answer to referee report, added original photometry data; 30 pages main text, 13 pages Appendix, 6 pages references, 5 tables, 16 figures; Figures 1 to 8 downgraded to fit arXiv space restrictions
A probabilistic finite element method based on random meshes: Error estimators and Bayesian inverse problems
Creators: name: Abdulle, Assyr
name: Garegnani, Giacomo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We present a novel probabilistic finite element method (FEM) for the solution and uncertainty quantification of elliptic partial differential equations based on random meshes, which we call random mesh FEM (RM-FEM). Our methodology allows to introduce a probability measure on standard piecewise linear FEM. We present a posteriori error estimators based uniquely on probabilistic information. A series of numerical experiments illustrates the potential of the RM-FEM for error estimation and validates our analysis. We furthermore demonstrate how employing the RM-FEM enhances the quality of the solution of Bayesian inverse problems, thus allowing a better quantification of numerical errors in pipelines of computations.
The Influence of User Generated Content on Purchase Intention of Automobiles in Sri Lanka
Creators: name: Dk, Thilina
Publisher: name: figshare
Year: 2021
Subjects: subject: 150503 Marketing Management (incl. Strategy and Customer Relations)
subject: FOS: Economics and business
subject: 150502 Marketing Communications
subject: 150506 Marketing Theory

description: The purpose of this study to identify the influence of user generated content on purchase intention of automobiles in Sri Lanka. The said study is based on the theory of Uses and Gratification and supportive findings. This study has been addressed the survey type research method and structured questionnaire was used to collect data and utilize sample frame of automobile followers on Facebook. Measuring the influence of user generated content on purchase intention through developed hypotheses. Researchers have used analysis technique of descriptive analysis, regression, and frequency test where statistical package for social science (SPSS) was used as the main analytical software. The results of the study discuss the main eight element affect the purchase intention of automobiles, but the two elements not strongly affect the purchase intention which were namely, homophily and trust. These two elements have weak relationship with the purchase intention. Mainly consumer resonance mediating the user generated characteristics to purchase intention of automobiles. Hence this study has been significantly contributing to the existing knowledge explaining the need, motivation (users and gratification) - consumer resonance-intention linkage in customer behaviour.
A Systematic Study of Departures from Chemical Equilibrium in the Atmospheres of Substellar Mass Objects
Creators: name: Hubeny, Ivan
name: Burrows, Adam
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a systematic study of the spectral consequences of departures from chemical equilibrium in the atmospheres of L and T dwarfs, and for even cooler dwarfs. The temperature/pressure profiles of the non-equilibrium models are fully consistent with the non-equilibrium chemistry. Our grid of non-equilibrium models includes spectra for effective temperatures from 200 K to 1800 K, three surface gravities, four possible values of the coefficient of eddy diffusion in the radiative zone, and three different CO/CH$_4$ chemical reaction prescriptions. We find that the non-equilibrium overabundance of CO translates into flux suppressions in the M ($\sim4-$5 $μ$m) band of at most $\sim$40% between effective temperatures of 600 and 1800 K. The effect is largest around $T_{\rm eff} \approx 1100$ K. The underabundance of ammonia due to non-equilibrium chemistry translates into flux enhancements of no more than $\sim$20% for the $T_{\rm eff}$ range from 300 to 1800 K, with the largest effects at the lowest values of $T_{\rm eff}$. The magnitude of the departure from chemical equilibrium increases with decreasing gravity, with increasing eddy diffusion coefficient, and with decreasing speed of the CO/CH$_4$ reaction. Though these effects are modest, they lead to better fits with the measured T dwarf spectra. Furthermore, the suppression in the M band due to non-equilibrium enhancements in the CO abundance disappears below $\sim$500 K, and is only partial above $\sim$500 K, preserving the M band flux as a useful diagnostic of cool atmospheres and maintaining its importance for searches for brown dwarfs cooler than T dwarfs.
description: Accepted to the Astrophysical Journal; 21 figures in a total of 26 emulateapj pages
Symmetrized models of last passage percolation and non-intersecting lattice paths
Creators: name: Forrester, Peter J.
name: Rains, Eric M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: It has been shown that the last passage time in certain symmetrized models of directed percolation can be written in terms of averages over random matrices from the classical groups $U(l)$, $Sp(2l)$ and $O(l)$. We present a theory of such results based on non-intersecting lattice paths, and integration techniques familiar from the theory of random matrices. Detailed derivations of probabilities relating to two further symmetrizations are also given.
description: 21 pages, 5 figures
title: Non-isothermal Phase-Field Modeling of Heat–Melt–Microstructure-Coupled Processes During Powder Bed Fusion
Creators: name: Yang, Yangyiwei
name: Kühn, Patrick
name: Yi, Min
name: Egger, Herbert
name: Xu, Bai-Xiang
Publisher: name: Springer Science
Year: 2024

description: Modeling and simulation of powder bed fusion (PBF) remain a great challenge due to the sophisticated and interactive nature of underlying physics. A unified scenario considering interactions among the heat transfer, melt flow dynamics and microstructure evolution (noted as “heat–melt–microstructure-coupled processes”) is therefore essential for a thermodynamically consistent description and thus reliable microstructure prediction. In contrast to the state of the art, where either individual aspects are considered or the thermal history is taken as input from separate numerical scheme, we propose in this work a unified non-isothermal phase-field model for the heat–melt–microstructure-coupled processes during PBF. Simulations on a stainless steel 316L powder bed demonstrate that the model can reproduce well-observed features, but also help to discover new in-process phenomena and reveal the mechanism of the defect formation. Based on massive simulation results, we also present the densification map with respect to beam power and scan speed, and have classified the regions of the parameter combination by the distinct resultant morphology.
Fisher Lecture: Dimension Reduction in Regression
Creators: name: Cook, R. Dennis
Publisher: name: arXiv
Year: 2007
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Beginning with a discussion of R. A. Fisher's early written remarks that relate to dimension reduction, this article revisits principal components as a reductive method in regression, develops several model-based extensions and ends with descriptions of general approaches to model-based and model-free dimension reduction in regression. It is argued that the role for principal components and related methodology may be broader than previously seen and that the common practice of conditioning on observed values of the predictors may unnecessarily limit the choice of regression methodology.
description: This paper commented in: [arXiv:0708.3776], [arXiv:0708.3777], [arXiv:0708.3779]. Rejoinder in [arXiv:0708.3781]. Published at http://dx.doi.org/10.1214/088342306000000682 in the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Entropy Change through Rayleigh-Bénard Convective Transition with Rigid Boundaries
Creators: name: Kita, Takafumi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The previous investigation on Rayleigh-Bénard convection of a dilute classical gas [T. Kita: J. Phys. Soc. Jpn. {\bf 75} (2006) 124005] is extended to calculate entropy change of the convective transition with the rigid boundaries. We obtain results qualitatively similar to those of the stress-free boundaries. Above the critical Rayleigh number, the roll convection is realized among possible steady states with periodic structures, carrying the highest entropy as a function of macroscopic mechanical variables.
description: 5 pages, 4 figures
Isolate record for VAFB-ISO-713
Creators: name: Holloway, Corinne
Year: 1900
Subjects: subject: Santa Barbara (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/3486/santa-barbara-county
subject: Vandenberg Air Force Base (VAFB)
valueUri: https://core.tdar.org/browse/geographic-keyword/85469/vandenberg-air-force-base-vafb
subject: Vandenberg Space Force Base (VSFB)
valueUri: https://core.tdar.org/browse/geographic-keyword/85584/vandenberg-space-force-base-vsfb
subject: California (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/1484/california-state-territory
subject: Chipped Stone
valueUri: https://core.tdar.org/browse/material-type/2/chipped-stone
subject: Reconnaissance / Survey
valueUri: https://core.tdar.org/browse/investigation-type/7/reconnaissance-survey

description: This document is the isolated find record for VAFB-ISO-713. The artifact is a tertiary flake.
Decoherence of encoded quantum registers
Creators: name: Borghoff, Stefan
name: Klesse, Rochus
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In order to eliminate disturbing effects of decoherence, encoding of quantum information in decoherence-free subspaces has been suggested. We analyze the benefits of this concept for a quantum register that is realized in a spin chain in contact with a common bosonic bath. Within a dissipation-less model we provide explicit analytical results for the average fidelity of plain and encoded quantum registers. For the investigation of dissipative spin-boson couplings we employ a master equation of Bloch-Redfield type.
description: 13 pages, 9 figures
A Mechanised Proof of Gödel's Incompleteness Theorems using Nominal Isabelle
Creators: name: Paulson, Lawrence C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: 68V20, 03F40

description: An Isabelle/HOL formalisation of Gödel's two incompleteness theorems is presented. The work follows Świerczkowski's detailed proof of the theorems using hereditarily finite (HF) set theory. Avoiding the usual arithmetical encodings of syntax eliminates the necessity to formalise elementary number theory within an embedded logical calculus. The Isabelle formalisation uses two separate treatments of variable binding: the nominal package is shown to scale to a development of this complexity, while de Bruijn indices turn out to be ideal for coding syntax. Critical details of the Isabelle proof are described, in particular gaps and errors found in the literature.