cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Simulations of the Galaxy Cluster CIZA J2242.8+5301 I: Thermal Model and Shock Properties
Creators: name: Donnert, J. M. F.
name: Beck, A. M.
name: Dolag, K.
name: Röttgering, H. J. A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The giant radio relic in CIZA J2242.8+5301 is likely evidence of a Mpc sized shock in a massive merging galaxy cluster. However, the exact shock properties are still not clearly determined. In particular, the Mach number derived from the integrated radio spectrum exceeds the Mach number derived from the X-ray temperature jump by a factor of two. We present here a numerical study, aiming for a model that is consistent with the majority of observations of this galaxy cluster. We first show that in the northern shock upstream X-ray temperature and radio data are consistent with each other. We then derive progenitor masses for the system using standard density profiles, X-ray properties and the assumption of hydrostatic equilibrium. We find a class of models that is roughly consistent with weak lensing data, radio data and some of the X-ray data. Assuming a cool-core versus non-cool-core merger, we find a fiducial model with a total mass of $1.6 \times 10^{15}\,M_\odot$, a mass ratio of 1.76 and a Mach number that is consistent with estimates from the radio spectrum. We are not able to match X-ray derived Mach numbers, because even low mass models over-predict the X-ray derived shock speeds. We argue that deep X-ray observations of CIZA J2242.8+5301 will be able to test our model and potentially reconcile X-ray and radio derived Mach numbers in relics.
description: 19 pages, 19 figures
Using Bad Learners to find Good Configurations
Creators: name: Nair, Vivek
name: Menzies, Tim
name: Siegmund, Norbert
name: Apel, Sven
Publisher: name: arXiv
Year: 2017
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Finding the optimally performing configuration of a software system for a given setting is often challenging. Recent approaches address this challenge by learning performance models based on a sample set of configurations. However, building an accurate performance model can be very expensive (and is often infeasible in practice). The central insight of this paper is that exact performance values (e.g. the response time of a software system) are not required to rank configurations and to identify the optimal one. As shown by our experiments, models that are cheap to learn but inaccurate (with respect to the difference between actual and predicted performance) can still be used rank configurations and hence find the optimal configuration. This novel \emph{rank-based approach} allows us to significantly reduce the cost (in terms of number of measurements of sample configuration) as well as the time required to build models. We evaluate our approach with 21 scenarios based on 9 software systems and demonstrate that our approach is beneficial in 16 scenarios; for the remaining 5 scenarios, an accurate model can be built by using very few samples anyway, without the need for a rank-based approach.
description: 11 pages, 11 figures
ELSI: A Unified Software Interface for Kohn-Sham Electronic Structure Solvers
Creators: name: Yu, Victor Wen-zhe
name: Corsetti, Fabiano
name: García, Alberto
name: Huhn, William P.
name: Jacquelin, Mathias
name: Jia, Weile
name: Lange, Björn
name: Lin, Lin
name: Lu, Jianfeng
name: Mi, Wenhui
name: Seifitokaldani, Ali
name: Vázquez-Mayagoitia, Álvaro
name: Yang, Chao
name: Yang, Haizhao
name: Blum, Volker
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Solving the electronic structure from a generalized or standard eigenproblem is often the bottleneck in large scale calculations based on Kohn-Sham density-functional theory. This problem must be addressed by essentially all current electronic structure codes, based on similar matrix expressions, and by high-performance computation. We here present a unified software interface, ELSI, to access different strategies that address the Kohn-Sham eigenvalue problem. Currently supported algorithms include the dense generalized eigensolver library ELPA, the orbital minimization method implemented in libOMM, and the pole expansion and selected inversion (PEXSI) approach with lower computational complexity for semilocal density functionals. The ELSI interface aims to simplify the implementation and optimal use of the different strategies, by offering (a) a unified software framework designed for the electronic structure solvers in Kohn-Sham density-functional theory; (b) reasonable default parameters for a chosen solver; (c) automatic conversion between input and internal working matrix formats, and in the future (d) recommendation of the optimal solver depending on the specific problem. Comparative benchmarks are shown for system sizes up to 11,520 atoms (172,800 basis functions) on distributed memory supercomputing architectures.
description: 55 pages, 14 figures, 2 tables
Prozessangepasste, multiskalare Werkstoffcharakterisierung im PBF-LB/P
Creators: name: Cholewa, S.
name: Marschall, M.
name: Drummer, D.
name: Schmidt, M.
Publisher: name: Zenodo
Year: 2023
Subjects: SFB 814 Additive Fertigung Abschlusskolloqium

description: Das Hauptziel dieses Teilprojekts besteht darin, wesentliche werkstoffliche Prozessgrößen im Laserstrahlschmelzprozess von Kunststoffen (LSS-K) wissenschaftlich zu erfassen, quantitativ zu bestimmen und ein grundlegendes Verständnis dafür aufzubauen. Hierbei liegt der Fokus einerseits auf dem Erstarrungsverhalten und andererseits auf dem Energieeintrag. Das Ziel ist die Herstellung von Bauteilen mit geringen Eigenspannungen und hoher mechanischer Belastbarkeit. Um dieses Ziel zu erreichen, werden optimierte Prozessparameter benötigt. Diese Parameter werden aus der prozessnahen Charakterisierung der LSS-K-Pulverwerkstoffe abgeleitet. Dabei werden insbesondere ihre thermo-mechanischen und optischen Eigenschaften untersucht.
Enhancing Bayesian Network Structural Learning with Monte Carlo Tree Search
Creators: name: Laborda, Jorge D.
name: Torrijos, Pablo
name: Puerta, José M.
name: Gámez, José A.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This article presents MCTS-BN, an adaptation of the Monte Carlo Tree Search (MCTS) algorithm for the structural learning of Bayesian Networks (BNs). Initially designed for game tree exploration, MCTS has been repurposed to address the challenge of learning BN structures by exploring the search space of potential ancestral orders in Bayesian Networks. Then, it employs Hill Climbing (HC) to derive a Bayesian Network structure from each order. In large BNs, where the search space for variable orders becomes vast, using completely random orders during the rollout phase is often unreliable and impractical. We adopt a semi-randomized approach to address this challenge by incorporating variable orders obtained from other heuristic search algorithms such as Greedy Equivalent Search (GES), PC, or HC itself. This hybrid strategy mitigates the computational burden and enhances the reliability of the rollout process. Experimental evaluations demonstrate the effectiveness of MCTS-BN in improving BNs generated by traditional structural learning algorithms, exhibiting robust performance even when base algorithm orders are suboptimal and surpassing the gold standard when provided with favorable orders.
Statistical analysis plan for Frontline treatment of Follicular Lymphoma with AtezolizUmab and Obinutuzumab with and without radiotherapy
Creators: name: Grobler, Anneke
Publisher: name: Murdoch Childrens Research Institute
Year: 2023
Subjects: Health Sciences

description: Statistical analysis plan for Frontline treatment of Follicular Lymphoma with AtezolizUmab and Obinutuzumab with and without radiotherapy
An Impact Evaluation Of The Ube School Feeding And Health Programme In Cross River State, Nigeria.pdf
Creators: name: Orji, Evelyn   Ijeoma
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: The study which was an ex-post facto was conducted in Cross River State of Nigeria. A total of 840 public primary school pupils were sampled across the state using the stratified random sampling procedure. Of this number 420 were selected from all the primary schools where the state government is pilot-testing the feeding programme while the other 420 were selected from other schools yet to encounter the programme. Two instruments; Motivation to School and Physical Health Questionnaire (MSPHQ) and Test of Cognitive Ability (TCA) were used in collecting data for analysis. Results of the study were that the UBE School feeding programme motivated children to be in school and also improved their cognitive abilities, but did not improve the physical health of the pupils. It was recommended that, further studies be carried out on the scheme especially in the area of physical health improvement of pupils. Teachers and parents may be used for such future studies
Two-Loop integrals for CP-even heavy quarkonium production and decays
Creators: name: Chen, Long-Bin
name: Liang, Yi
name: Qiao, Cong-Feng
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: By employing the method of differential equations, we compute the various types of two-loop master integrals involved in CP-even heavy quarkonium exclusive production and decays. All the integrals presented in this paper can be casted into canonical forms and expressed in terms of Goncharov polylogarithms and Harmonic polylogarithms. These master integrals are frequently used in the calculation of NNLO corrections of the heavy quarkonium production processes, as $γ^*γ\rightarrow Q\bar{Q}$, $e^+e^-\rightarrow γ+ Q\bar{Q}$, and $H/Z^0\rightarrow γ+ Q\bar{Q}$, and decay processes. They are also applicable in the calculation of NNLO corrections to CP-even quarkonium inclusive production and decay processes.
description: 33 pages, 2 figures
Logic and Topology for Knowledge, Knowability, and Belief
Creators: name: Bjorndahl, Adam
name: Özgün, Aybüke
Publisher: name: arXiv
Year: 2016
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: In recent work, Stalnaker proposes a logical framework in which belief is realized as a weakened form of knowledge. Building on Stalnaker's core insights, and using frameworks developed in previous work by Bjorndahl and Baltag et al., we employ topological tools to refine and, we argue, improve on this analysis. The structure of topological subset spaces allows for a natural distinction between what is known and (roughly speaking) what is knowable; we argue that the foundational axioms of Stalnaker's system rely intuitively on both of these notions. More precisely, we argue that the plausibility of the principles Stalnaker proposes relating knowledge and belief relies on a subtle equivocation between an "evidence-in-hand" conception of knowledge and a weaker "evidence-out-there" notion of what could come to be known. Our analysis leads to a trimodal logic of knowledge, knowability, and belief interpreted in topological subset spaces in which belief is definable in terms of knowledge and knowability. We provide a sound and complete axiomatization for this logic as well as its uni-modal belief fragment. We then consider weaker logics that preserve suitable translations of Stalnaker's postulates, yet do not allow for any reduction of belief. We propose novel topological semantics for these irreducible notions of belief, generalizing our previous semantics, and provide sound and complete axiomatizations for the corresponding logics.
description: 26 pages
Quark Wigner distributions and spin-spin correlations
Creators: name: Chakrabarti, D.
name: Maji, T.
name: Mondal, C.
name: Mukherjee, A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the Wigner distributions for $u$ and $d$ quarks in a light-front quark-diquark model of a proton to unravel the spatial and spin structure. The light-front wave functions are modeled from the soft-wall AdS/QCD prediction. We consider the contributions from both the scalar and the axial vector diquarks. The Wigner distributions for unpolarized, longitudinally polarized, and transversely polarized protons are presented in the transverse momentum plane as well as in the transverse impact parameter plane. The Wigner distributions satisfy a Soffer-bound-type inequality. We also evaluate all the leading twist GTMDs and show their scale evolution. The spin-spin correlations between the quark and the proton are investigated
description: 35 pages, 16 figures. arXiv admin note: text overlap with arXiv:1601.03217
การพัฒนาสู่ความทันสมัยที่มีอิทธิพลต่อการจัดกิจกรรมอนุรักษ์สิ่งแวดล้อมในสถาบันอุดมศึกษา
Creators: name: ทศพล วัฒนานุกูลวงศ์
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2023
Subjects: การพัฒนาสู่ความทันสมัย
การฟื้นฟูระบบนิเวศ
กิจกรรมการอนุรักษ์สิ่งแวดล้อม
สถาบันอุดมศึกษา

description: The Journal of Research and Academics, 6, 4, 359-376
Compton scattering off proton in the third resonance region
Creators: name: Cao, Xu
name: Lenske, H.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Compton scattering off the proton in the third resonance region is analyzed for the first time, owing to the full combined analysis of pion- and photo-induced reactions in a coupled-channel effective Lagrangian model with K-matrix approximation. Two isospin $I=3/2$ resonances $D_{33}(1700)$ and $F_{35}(1930)$ are found to be essential in the range of 1.6 - 1.8 GeV. The recent beam asymmetry data of Compton scattering from the GRAAL facility are used to determine the helicity couplings of these resonances, and strong constraints are coming also from $πN$ and $KΣ$ photoproduction data. The possible spin and parity of new narrow resonances is discussed.
description: 7 pages, 2 figs, 2 tabs, publish version
การพัฒนารูปแบบการบริหารจัดการกลุ่มแปลงใหญ่ลำไยตำบลหนองยวง อำเภอเวียงหนองล่อง จังหวัดลำพูน
Creators: name: มนชนก อุปะทะ
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2023
Subjects: การบริหารจัดการ
การพัฒนากลุ่ม
ลำไย

description: The Journal of Research and Academics, 6, 4, 377-392
การศึกษาการบริหารหลักสูตรการศึกษาปฐมวัยของศูนย์พัฒนาเด็กเล็ก สังกัดองค์กรปกครองส่วนท้องถิ่น จังหวัดพิษณุโลก
Creators: name: ขวัญหญิง ศรีบ้านคลอง
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2023
Subjects: การบริหาร
หลักสูตรการศึกษาปฐมวัย
ศูนย์พัฒนาเด็กเล็ก

description: The Journal of Research and Academics, 6, 4, 393-408
A Bayesian Framework to Constrain the Photon Mass with a Catalog of Fast Radio Bursts
Creators: name: Shao, Lijing
name: Zhang, Bing
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A hypothetical photon mass, $m_γ$, gives an energy-dependent light speed in a Lorentz-invariant theory. Such a modification causes an additional time delay between photons of different energies when they travel through a fixed distance. Fast radio bursts (FRBs), with their short time duration and cosmological propagation distance, are excellent astrophysical objects to constrain $m_γ$. Here for the first time we develop a Bayesian framework to study this problem with a catalog of FRBs. Those FRBs with and without redshift measurement are both useful in this framework, and can be combined in a Bayesian way. A catalog of 21 FRBs (including 20 FRBs without redshift measurement, and one, FRB 121102, with a measured redshift $z=0.19273 \pm 0.00008$) give a combined limit $m_γ\leq 8.7 \times 10^{-51}\, {\rm kg}$, or equivalently $m_γ\leq 4.9 \times 10^{-15}\, {\rm eV}/c^2$ ($m_γ\leq 1.5\times10^{-50} \, {\rm kg}$, or equivalently $m_γ\leq 8.4 \times 10^{-15} \,{\rm eV}/c^2$) at 68% (95%) confidence level, which represents the best limit that comes purely from kinematics. The framework proposed here will be valuable when FRBs are observed daily in the future. Increment in the number of FRBs, and refinement in the knowledge about the electron distributions in the Milky Way, the host galaxies of FRBs, and the intergalactic median, will further tighten the constraint.
description: 10 pages, 6 figures; Physical Review D, in press
title: Επιφανειακή τροποποίηση υλικών μέσω αλληλεπίδρασης με λέιζερ
title:  Laser surface modification of materials
Creators: name: Καπιδακης Σαραντος
Publisher: name: Technical University of Crete
Year: 2022

description: Στις μέρες μας, λόγω της ραγδαίας εξέλιξης της επιστήμης, έντονο είναι το ενδιαφέρον στον τομέα της επιστήμης των υλικών, στον οποίο αναζητούνται συνεχώς νέες καινοτόμες μέθοδοι που δύνανται να βελτιώσουν τις επιφανειακές ιδιότητες των υλικών. Αδιαμφισβήτητα, η επίδραση του λέιζερ στις επιφάνειες των υλικών αποτελεί μία ιδιαιτέρως ελκυστική μέθοδος καθώς όπως θα αναλυθεί στη παρούσα διπλωματική εργασία, συμπεριλαμβάνει ένα ευρύ φάσμα μεθόδων επεξεργασίας με σημαντικά πλεονεκτήματα. Ειδικότερα, τα λέιζερ έχουν τη δυνατότητα να αποδίδουν με ακρίβεια μεγάλες ποσότητες ενέργειας σε καθορισμένες περιοχές ενός υλικού προκειμένου να επιτευχθεί η επιθυμητή απόκριση. Αυτή η ενέργεια απορροφάται κοντά στην επιφάνεια των υλικών, τροποποιώντας με αυτό τον τρόπο τη χημεία της επιφάνειας και τη τοπική μικροδομή. Στην παρούσα διπλωματική εργασία γίνεται αρχικά αναφορά στις βασικές αρχές της αλληλεπίδρασης λέιζερ με την ύλη καθώς και στα διαφορετικά είδη λέιζερ. Στο δεύτερο μέρος εξετάζονται οι μέθοδοι τροποποίησης της επιφάνειας κάποιων τύπων υλικών σε σχέση με την αλληλεπίδραση τους με λέιζερ, ενώ παρουσιάζονται δυνατές εφαρμογές. Τέλος, στο τρίτο μέρος της εργασίας παρουσιάζονται οι εφαρμογές λέιζερ για την επεξεργασία της επιφάνειας μιας σειράς υλικών όπως ο χυτοσίδηρος, ο χάλυβας και το τιτάνιo καθώς και η περίπτωση χρήσης λέιζερ για την καταπολέμηση του φαινομένου της διάβρωσης από την σπηλαίωση.
description: Nowadays, due to the rapid development of science, there is intense interest in the field of materials science, in which new innovative methods that can improve the surface properties of materials are constantly being sought. Undoubtedly, the effect of the laser on the surfaces of materials is a particularly attractive method since, as will be analyzed in this thesis, it includes a wide range of processing methods with significant advantages. In particular, lasers have the ability to precisely deliver large amounts of energy to specific areas of a material in order to achieve the desired response. This energy is absorbed near the surface of the materials, thereby modifying the surface chemistry and local microstructure. In this thesis, the basic principles of laser interaction with matter and the different types of lasers are initially mentioned. In the second part, the methods of modifying the surface of some types of materials are examined in relation to their interaction with lasers, while possible applications are presented. Finally, in the third part of the work, laser applications are presented for the treatment of the surface of a series of materials such as cast iron, steel and titanium, as well as the case of laser use to combat the phenomenon of corrosion from cavitation.
Gender Distribution among Science Teachers in Calabar Education Zone of Cross River State- Implementation for Role Model in Science Education.pdf
Creators: name: Inyang, Mary  Imo
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: This study investigated gender distribution among science in Calabar Education Zone, from the viewpoint of role models. The entire population of 320 senior secondary school science (biology, 210; chemistry, 73 and physics, 37) teachers in the 80 public schools in calabar education zone formed the sample for the study. Demographic information from a 51 item questionnaire titled “Science Teachers’ Perception of Open Education Resources” (BTICTCS) served as data source for this assessment. Of the Questionnaire 283 administered, 279 were returned and 270 were useable. The results shows that (1) more female are found in the life sciences than physical science- Biology m=18(16.2%), f=93(83.8%); Physics m= 39(65%), f=21(35%) (2) the number of young female science teachers decrease with decrease in age 41-45years, 48(26.7%); 36-40years-48(26.7%), 31-35years-36(20%) and below 31years only 21(11.7%). (3) generally the number of science teachers deceases with decrease in years of teaching experience between 6-10year category =96(35.6%), 11-15year (78 (28.9%)) and 0-5years category = 39(14.4%). Based on the results it was recommended that (1)Schools should liaise with female scientists, e.g. health practitioners, educators, technologists, engineers, etc, to hold special school career talks where students are generally addressed and encouraged to take on more career in science. Such fora could be used to address their fears and (2) More should be done by government to encourage science enrolment in tertiary institutions.
Federated Learning with Discriminative Naive Bayes Classifier
Creators: name: Torrijos, Pablo
name: Alfaro, Juan C.
name: Gámez, José A.
name: Puerta, José M.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Federated Learning has emerged as a promising approach to train machine learning models on decentralized data sources while preserving data privacy. This paper proposes a new federated approach for Naive Bayes (NB) classification, assuming discrete variables. Our approach federates a discriminative variant of NB, sharing meaningless parameters instead of conditional probability tables. Therefore, this process is more reliable against possible attacks. We conduct extensive experiments on 12 datasets to validate the efficacy of our approach, comparing federated and non-federated settings. Additionally, we benchmark our method against the generative variant of NB, which serves as a baseline for comparison. Our experimental results demonstrate the effectiveness of our method in achieving accurate classification.
การพัฒนากระบวนการทำงานที่สร้างความผูกพันของเยาวชนกับชุมชนท้องถิ่น
Creators: name: ธิดารัตน์ ศักดิ์วีระกุล
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2023
Subjects: กระบวนการพัฒนาเยาวชน
เยาวชนในท้องถิ่น
ความผูกพันกับชุมชน
การวิจัยปฏิบัติการแบบมีส่วนร่วมโดยชุมชนเป็นฐาน

description: The Journal of Research and Academics, 6, 4, 409-422
Topological Data Analysis of Financial Time Series: Landscapes of Crashes
Creators: name: Gidea, Marian
name: Katz, Yuri
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Finance (q-fin.MF)
subject: Dynamical Systems (math.DS)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We explore the evolution of daily returns of four major US stock market indices during the technology crash of 2000, and the financial crisis of 2007-2009. Our methodology is based on topological data analysis (TDA). We use persistence homology to detect and quantify topological patterns that appear in multidimensional time series. Using a sliding window, we extract time-dependent point cloud data sets, to which we associate a topological space. We detect transient loops that appear in this space, and we measure their persistence. This is encoded in real-valued functions referred to as a 'persistence landscapes'. We quantify the temporal changes in persistence landscapes via their $L^p$-norms. We test this procedure on multidimensional time series generated by various non-linear and non-equilibrium models. We find that, in the vicinity of financial meltdowns, the $L^p$-norms exhibit strong growth prior to the primary peak, which ascends during a crash. Remarkably, the average spectral density at low frequencies of the time series of $L^p$-norms of the persistence landscapes demonstrates a strong rising trend for 250 trading days prior to either dotcom crash on 03/10/2000, or to the Lehman bankruptcy on 09/15/2008. Our study suggests that TDA provides a new type of econometric analysis, which goes beyond the standard statistical measures. The method can be used to detect early warning signals of imminent market crashes. We believe that this approach can be used beyond the analysis of financial time series presented here.
Selektives Laserstrahlschmelzen von Verbundwerkstoffsystemen zur Herstellung metallischer Leichtbaustrukturen
Creators: name: Nahr, Florian
name: Schmidt, Michael
Publisher: name: Zenodo
Year: 2023
Subjects: SFB 814 Additive Fertigung Abschlusskolloqium

description: In diesem Projekt wird die Verarbeitung von Legierungen der EN AW-6xxx Gruppe im Laserstrahlschmelzprozess zur Herstellung von Bauteilen untersucht. Ein grundlegendes Verständnis der Erstarrungsbedingungen und die Fähigkeit, diese zu kontrollieren, sind dabei von entscheidender Bedeutung. Um dieses Ziel zu erreichen, werden Spektroskopie und hyperspektrale Bildgebung eingesetzt, um die tatsächlichen Temperaturen zeitlich und räumlich aufgelöst zu erfassen. Anschließend werden die Intensitätsprofile des Laserstrahls durch diffraktive Strahlformung angepasst, um diese tatsächlichen Temperaturen gezielt zu beeinflussen. Des Weiteren werden der Einfluss von Keimbildnern untersucht und die Mikrostruktur gezielt eingestellt.
When black holes collide: Probing the interior composition by the spectrum of ringdown modes and emitted gravitational waves
Creators: name: Brustein, Ram
name: Medved, A. J. M.
name: Yagi, K.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The merger of colliding black holes (BHs) should lead to the production of ringdown or quasinormal modes (QNMs), which may very well be sensitive to the state of the interior. We put this idea to the test with a recent proposal that the interior of a BH consists of a bound state of highly excited, long, closed, interacting strings; figuratively, a collapsed polymer. We show that such BHs do indeed have a distinct signature in their QNM spectrum: A new class of modes whose frequencies are parametrically lower than the lowest-frequency mode of a classical BH and whose damping times are parametrically longer. The reason for the appearance of the new modes is that our model contains another scale, the string length, which is parametrically larger than the Planck length. This distinction between the collapsed-polymer model and general-relativistic BHs could be made with gravitational-wave observations and offers a means for potentially measuring the strength of the coupling in string theory. For example, GW150914 already allows us to probe the strength of the string coupling near the regime which is predicted by the unification of the gravitational and gauge-theory couplings. We also derive bounds on the amplitude of the collapsed-polymer QNMs that can be placed by current and future gravitational-wave observations.
description: 53 pages, 4 figures, major revision in presentation, additional explanations, discussions, clarifications. Results unchanged
คพฺภปาตน: ชีวิตเป็นของใคร สิทธิที่สตรีต้องตัดสินใจ
Creators: name: พระมหาเจษฏ์ฌกฤษฎ์ ปญฺญาธโร
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2023
Subjects: การทำแท้ง
สิทธิสตรี
การตัดสินใจ

description: The Journal of Research and Academics, 6, 4, 423-438
Rigidity results for variational infinity ground states
Creators: name: Crasta, Graziano
name: Fragalà, Ilaria
Publisher: name: arXiv
Year: 2017
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 49K20

description: We prove two rigidity results for a variational infinity ground state $u$ of an open bounded convex domain $Ω\subset \mathbb{R}^n$. They state that $u$ coincides with a multiple of the distance from the boundary of $Ω$ if either $|\nabla u|$ is constant on $\partial Ω$, or $u$ is of class $C ^ {1,1}$ outside the high ridge of $Ω$. Consequently, in both cases $Ω$ can be geometrically characterized as a "stadium-like domain".
description: 15 pages
Two-point Functions in a Holographic Kondo Model
Creators: name: Erdmenger, Johanna
name: Hoyos, Carlos
name: O'Bannon, Andy
name: Papadimitriou, Ioannis
name: Probst, Jonas
name: Wu, Jackson M. S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We develop the formalism of holographic renormalization to compute two-point functions in a holographic Kondo model. The model describes a $(0+1)$-dimensional impurity spin of a gauged $SU(N)$ interacting with a $(1+1)$-dimensional, large-$N$, strongly-coupled Conformal Field Theory (CFT). We describe the impurity using Abrikosov pseudo-fermions, and define an $SU(N)$-invariant scalar operator $\mathcal{O}$ built from a pseudo-fermion and a CFT fermion. At large $N$ the Kondo interaction is of the form $\mathcal{O}^{\dagger} \mathcal{O}$, which is marginally relevant, and generates a Renormalization Group (RG) flow at the impurity. A second-order mean-field phase transition occurs in which $\mathcal{O}$ condenses below a critical temperature, leading to the Kondo effect, including screening of the impurity. Via holography, the phase transition is dual to holographic superconductivity in $(1+1)$-dimensional Anti-de Sitter space. At all temperatures, spectral functions of $\mathcal{O}$ exhibit a Fano resonance, characteristic of a continuum of states interacting with an isolated resonance. In contrast to Fano resonances observed for example in quantum dots, our continuum and resonance arise from a $(0+1)$-dimensional UV fixed point and RG flow, respectively. In the low-temperature phase, the resonance comes from a pole in the Green's function of the form $-i \langle {\cal O} \rangle^2$, which is characteristic of a Kondo resonance.
description: 65 pages, 17 figures; v2 minor improvements. Version published in JHEP
ข้อสันนิษฐานที่มาของครุฑคาบแก้วในจิตรกรรมเทพชุมนุมสมัยรัตนโกสินทร์
Creators: name: วชิรวิชญ์ ตั้งธนานุวัฒน์
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2023
Subjects: ครุฑคาบแก้ว
เทพชุมนุม
รามเกียรติ์
สดายุ
แหวน

description: The Journal of Research and Academics, 6, 4, 439-450
On Magnetohydrodynamic Gauge Field Theory
Creators: name: Webb, G. M.
name: Anco, S. C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Clebsch potential gauge field theory for magnetohydrodynamics is developed based in part on the theory of Calkin (1963). It is shown how the polarization vector ${\bf P}$ in Calkin's approach, naturally arises from the Lagrange multiplier constraint equation for Faraday's equation for the magnetic induction ${\bf B}$, or alternatively from the magnetic vector potential form of Faraday's equation. Gauss's equation, (divergence of ${\bf B}$ is zero), is incorporated in the variational principle by means of a Lagrange multiplier constraint. Noether's theorem, coupled with the gauge symmetries is used to derive the conservation laws for (a)\ magnetic helicity (b)\ cross helicity, (c) fluid helicity for non-magnetized fluids, and (d) a class of conservation laws associated with curl and divergence equations, which applies to Faraday's equation and Gauss's equation. The magnetic helicity conservation law is due to a gauge symmetry in MHD and not due to a fluid relabelling symmetry. The analysis is carried out for the general case of a non-barotropic gas, in which the gas pressure and internal energy density depend on both the entropy $S$ and the gas density $ρ$. The cross helicity and fluid helicity conservation laws in the non-barotropic case, are nonlocal conservation laws, that reduce to local conservation laws for the case of a barotropic gas. The connections between gauge symmetries, Clebsch potentials and Casimirs are developed. It is shown that the gauge symmetry functionals in the work of Henyey (1982) satisfy the Casimir determining equations.
description: 38 pages
Forschungsdatenmanagement in Forschungsgroßprojekten
Creators: name: Plass, Fabian
name: Stingl, Michael
Publisher: name: Zenodo
Year: 2023
Subjects: SFB 814 Additive Fertigung Abschlusskolloqium

description: Ziel ist die systematische Verwaltung von Forschungsdaten, die im SFB 814: Additive Fertigung durch Experimente, Messverfahren und Simulationen. Die Implementierung eines ELN-LIMS-Tools als kooperatives Werkzeug sowie die Nutzung eines Datenrepositoriums spielen eine wichtige Rolle, um das Ziel eines umfassenden Datenmanagements für verschiedene Forschungsdisziplinen innerhalb des SFBs zu erreichen.
Estimating the central charge from the Rényi entanglement entropy
Creators: name: Bazavov, A.
name: Meurice, Y.
name: Tsai, S. -W.
name: Unmuth-Yockey, J.
name: Yang, Li-Ping
name: Zhang, Jin
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We calculate the von Neumann and Rényi bipartite entanglement entropy of the $O(2)$ model with a chemical potential on a 1+1 dimensional Euclidean lattice with open and periodic boundary conditions. We show that the Calabrese-Cardy conformal field theory predictions for the leading logarithmic scaling with the spatial size of these entropies are consistent with a central charge $c=1$. This scaling survives the time continuum limit and truncations of the microscopic degrees of freedom, modifications which allow us to connect the Lagrangian formulation to quantum Hamiltonians. At half-filling, the forms of the subleading corrections imposed by conformal field theory allow the determination of the central charge with an accuracy better than two percent for moderately sized lattices. We briefly discuss the possibility of estimating the central charge using quantum simulators.
description: 10 pages, 8 figures, 3 tables
The price response to SET 50 index additions and deletions : Recent empirical evidence
Creators: name: Nattawut Jenwittayaroje
Publisher: name: Business Administration Kasetsart University
Year: 2023
Subjects: Abnormal Return, Added (Deleted) Stocks, Index Fund, SET 50 Index, the Stock Exchange of Thailand

description: Kasetsart Applied Business Journal, 17, 26, 18-36
Optimized trajectories to the nearest stars using lightweight high-velocity photon sails
Creators: name: Heller, René
name: Hippke, Michael
name: Kervella, Pierre
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: New means of interstellar travel are now being considered by various research teams, assuming lightweight spaceships to be accelerated via either laser or solar radiation to a significant fraction of the speed of light (c). We recently showed that gravitational assists can be combined with the stellar photon pressure to decelerate an incoming lightsail from Earth and fling it around a star or bring it to rest. Here, we demonstrate that photogravitational assists are more effective when the star is used as a bumper (i.e. the sail passes "in front of" the star) rather than as a catapult (i.e. the sail passes "behind" or "around" the star). This increases the maximum deceleration at $α$ Cen A and B and reduces the travel time of a nominal graphene-class sail (mass-to-surface ratio 8.6e-4 gram m$^{-2}$) from 95 to 75 yr. The maximum possible velocity reduction upon arrival depends on the required deflection angle from $α$ Cen A to B and therefore on the binary's orbital phase. Here, we calculate the variation of the minimum travel times from Earth into a bound orbit around Proxima for the next 300 yr and then extend our calculations to roughly 22,000 stars within about 300 ly. Although $α$ Cen is the most nearby star system, we find that Sirius A offers the shortest possible travel times into a bound orbit: 69 yr assuming 12.5% c can be obtained at departure from the solar system. Sirius A thus offers the opportunity of flyby exploration plus deceleration into a bound orbit of the companion white dwarf after relatively short times of interstellar travel.
description: 14 pages, 7 figures (5 col, 2 b/w), 2 tables
Searches for Lepton Number Violation and Resonances in $K^{\pm}\toπμμ$ Decays
Creators: name: 2 Collaboration
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles in 2003--2004. A new upper limit on the rate of the lepton number violating decay $K^{\pm}\toπ^{\mp}μ^{\pm}μ^{\pm}$ is reported: $\mathcal{B}(K^{\pm}\toπ^{\mp}μ^{\pm}μ^{\pm})<8.6 \times 10^{-11}$ at 90% CL. Searches for two-body resonances $X$ in $K^{\pm}\toπμμ$ decays (such as heavy neutral leptons $N_4$ and inflatons $χ$) are also presented. In the absence of signals, upper limits are set on the products of branching fractions $\mathcal{B}(K^{\pm}\toμ^{\pm}N_4)\mathcal{B}(N_4\toπμ)$ and $\mathcal{B}(K^{\pm}\toπ^{\pm}X)\mathcal{B}(X\toμ^+μ^-)$ for ranges of assumed resonance masses and lifetimes. The limits are in the $(10^{-11},10^{-9})$ range for resonance lifetimes below 100 ps.
description: 15 pages, accepted for publication in Physics Letters B
Mehrphasensysteme im selektiven Lasersintern
Creators: name: Lindbüchl, Matthias
name: Drummer, Dietmar
Publisher: name: Zenodo
Year: 2023
Subjects: SFB 814 Additive Fertigung Abschlusskolloqium

description: Das Teilprojekt A6 hat das Ziel, durch die Verwendung von Vibrationsdüsen beim selektiven Laserstrahlschmelzen Füllstoffe und Blendkomponenten lokal einzubringen. Dadurch sollen gradierte Bauteileigenschaften erzielt werden. Des Weiteren werden Methoden untersucht, um Fasern in der z-Richtung zu orientieren, um eine Verstärkung in Aufbaurichtung zu erzeugen. Dies eröffnet völlig neue Freiheitsgrade zur Einstellung von Bauteileigenschaften. Im Rahmen des Projekts sollen die Auswirkungen der lokal eingebrachten und ausgerichteten Partikel auf die Prozessführung erforscht werden.
The intrinsic Baldwin effect in broad Balmer lines of six long-term monitored AGNs
Creators: name: Rakic, Nemanja
name: La Mura, Giovanni
name: Ilic, Dragana
name: Shapovalova, Alla I.
name: Kollatschny, Wolfram
name: Rafanelli, Piero
name: Popovic, Luka C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the intrinsic Baldwin effect (Beff) of the broad H$α$ and H$β$ emission lines for six Type 1 active galactic nuclei (AGNs) with different broad line characteristics: two Seyfert 1 (NGC 4151 and NGC 5548), two AGNs with double-peaked broad line profiles (3C 390.3 and Arp 102B), one narrow line Seyfert 1 (Ark 564), and one high-luminosity quasar with highly red asymmetric broad line profiles (E1821+643). We found that a significant intrinsic Beff was present in all Type 1 AGNs in our sample. Moreover, we do not see strong difference in intrinsic Beff slopes in different types of AGNs which probably have different physical properties, such as inclination, broad line region geometry, or accretion rate. Additionally, we found that the intrinsic Beff was not connected with the global one, which, instead, could not be detected in the broad H$α$ or H$β$ emission lines. In the case of NGC 4151, the detected variation of the Beff slope could be due to the change in the site of line formation in the BLR. Finally, the intrinsic Beff might be caused by the additional optical continuum component that is not part of the ionization continuum.
description: 12 pages, 8 figures, Accepted for publication in A&A
Kaluza-Klein Reduction of Low-Energy Effective Actions: Geometrical Approach
Creators: name: Vysoky, Jan
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Equations of motion of low-energy string effective actions can be conveniently described in terms of generalized geometry and Levi-Civita connections on Courant algebroids. This approach is used to propose and prove a suitable version of the Kaluza-Klein-like reduction. Necessary geometrical tools are recalled.
description: Some comments added based on the journal review. A few of minor typos corrected
Operational performance improvement by reducing waste in aluminumwindow production with industry 4.0 technologies
Creators: name: Satthachai Kaewkongphan
Publisher: name: Business Administration Kasetsart University
Year: 2023
Subjects: Aluminum window, Industry 4.0 Technology, Operational performance improvement,Production, Waste

description: Kasetsart Applied Business Journal, 17, 26, 72-88
Facing the challenge of predicting the standard formation enthalpies of n-butyl-phosphate species with ab initio methods
Creators: name: Saab, Mohamad
name: Réal, Florent
name: Šulka, Martin
name: Cantrel, Laurent
name: Virot, François
name: Vallet, Valérie
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: Tributyl-phosphate (TBP), a ligand used in the PUREX liquid-liquid separation process of spent nuclear fuel, can form explosive mixture in contact with nitric acid, that might lead to violent explosive thermal runaway. In the context of safety of a nuclear reprocessing plant facility, it is crucial to predict the stability of TBP at elevated temperatures. So far, only the enthalpies of formation of TBP is available in the literature with a rather large uncertainties, while those of its degradation products, di-(HDBP) and mono-(H$_2$MBP}) are unknown. In this goal, we have used state-of-the art quantum chemical methods to compute the formation enthalpies and entropies of TBP and its degradation products di-(HDBP), mono-(H$_2$MBP) in gas and liquid phases. Comparisons of levels of quantum chemical theory revealed that there are significant effects of correlation on their electronic structures, pushing for the need of not only high level of electronic correlation treatment, namely local coupled cluster with single and double excitation operators and perturbative treatment of triple excitations [LCCSD(T)], but also extrapolations to the complete basis to produce reliable and accurate thermodynamics data. Solvation enthalpies were computed with the conductor like screening model for real solvents [COSMO-RS], for which we observe errors not exceeding 22 kJ mol$^{-1}$. We thus propose with final uncertainty of about 20 kJ mol$^{-1}$ standard enthalpies of formation of TBP, HDBP, and H$_2$MBP which amounts to -1281.7$\pm$24.4, -1229.4$\pm$19.6 and -1176.7$\pm$14.8 kJ mol$^{-1}$, respectively, in the gas phase. In the liquid phase, the predicted values are -1367.3$\pm$24.4, -1348.7$\pm$19.6 and -1323.8$\pm$14.8 kJ mol$^{-1}$, to which we may add about -22 kJ mol$^{-1}$ error from the COSMO-RS solvent model. From these data, we predict the complete hydrolysis of TBP to be nearly thermoneutral.
Coscine – FAIR im Datenmeer
Creators: name: Lang, Ilona
Publisher: name: Zenodo
Year: 2022
Subjects: Forschungsdatenmanagement
research data management
FAIR principles
FAIR
Coscine
archiving
NFDI
PID
metadata

description: Coscine stands for Collaborative Scientific Integration Environment and is a web-based research data management (RDM) platform developed at RWTH Aachen University and offered across universities. Members of participating institutes can log into Coscine using their institutional account via the DFN-AAI authentication and authorization infrastructure. External users can log in via their ORCID. The FDM platform enables the storage, management and archiving of research and metadata generated in the context of research projects. In this way, Coscine supports researchers in RDM and in maintaining good scientific practice. This event took place on the occasion of the Day of Research Data in NRW. This year's action day was themed "Lighthouse FDM: Orientation in the sea of data". The complete program can be found on the website of the State Initiative for Research Data Management - fdm.nrw: Tag der Forschungsdaten in NRW 2022. --- Coscine steht für Collaborative Scientific Integration Environment und ist eine webbasierte Plattform zum Forschungsdatenmanagement (FDM), die an der RWTH Aachen University entwickelt und hochschulübergreifend angeboten wird. Angehörige von teilnehmenden Instituten können sich über die Authentifikations- und Autorisierungs-Infrastruktur DFN-AAI mit ihrem institutionellen Account in Coscine einloggen. Externe Nutzende können sich über ihre ORCID authentifizieren.Die FDM-Plattform ermöglicht die Speicherung, Verwaltung und Archivierung von Forschungs- und Metadaten, die im Kontext von Forschungsprojekten erzeugt werden. So unterstützt Coscine Forschende beim FDM und bei der Wahrung der guten wissenschaftlichen Praxis. Diese Veranstaltung fand zum Tag der Forschungsdaten in NRW statt. Der Aktionstag stand in diesem Jahr unter dem Motto „Leuchtturm FDM: Orientierung im Datenmeer“. Das vollständige Programm finden Sie auf der Webseite der Landesinitiative für Forschungsdatenmanagement – fdm.nrw: Tag der Forschungsdaten in NRW 2022.
description: Der Vortag wurde auf Deutsch gehalten, die Folien sind auf Englisch.
DEM simulation of the powder application in additive manufacturing
Creators: name: Angelidakis, Vasileios
name: Blank, Michael
name: R. Parteli, Eric J.
name: Roy, Sudeshna
name: Nasato, Daniel Schiochet
name: Xiao, Hongyi
name: Pöschel, Thorsten
Publisher: name: Zenodo
Year: 2023
Subjects: SFB 814 Additive Fertigung Abschlusskolloqium

description: Sub-project B1 focuses on simulating the powder recoating process in additive manufacturing. The primary objective is to investigate the recoating mechanism using realistic discrete element method (DEM) simulations, which take into account the particle shape, thermomechanical properties of the powder, and the effects of multiple recoated layers and the molten region. The aim is to derive optimized recoating strategies that are time-sensitive and explore alternative mechanisms that can be practically tested to enhance the quality of the manufactured component.