cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A systematic review on the 30-day and 12-month survival of functional mitral regurgitation patients after percutaneous edge-to-edge mitral valve repair (MitraClip) system μιτροειδούς με το σύστημα Mitraclip
Creators: name: Χατζηστεργίου, Κωνσταντίνος Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ανεπάρκεια Mιτροειδούς βαλβίδας
Διαδερμική επιδιόρθωση
Mitraclip
Mitral Valve Insuffisiency
Percutaneous repair

description: Η διπλωματική μεταπτυχιακή εργασία με τίτλο "Συστηματική ανασκόπηση για την επιβίωση ασθενών με λειτουργική ανεπάρκεια μιτροειδούς βαλβίδας, ένα μήνα και 12 μήνες μετά τη διαδερμική (edge to edge) επιδιόρθωση μιτροειδούς με το σύστημα Mitraclip" εκπονήθηκε στα πλαίσια του μεταπτυχιακού Ιατρική Ερευνητική Μεθοδολογία της Ιατρική Σχολής του Αριστοτέλειου Πανεπιστήμιου Θεσσαλονίκης. Η λειτουργική ανεπάρκεια μιτροειδούς βαλβίδας είναι μια καρδιακή πάθηση που επηρεάζει την ποιότητα και το προσδόκιμο ζωής εκατομμυρίων ανθρώπων παγκοσμίως. Η συσκευή Mitraclip (Abbot Vascular, Menlo Park, CA) χρησιμοποιείται για την διαδερμική επιδιόρθωση της μιτροειδούς βαλβίδας σε ασθενείς με οργανική ή λειτουργική ανεπάρκεια βασισμένη στη χειρουργική τεχνική "edge to edge" του Alfieri. Ένα σύνολο 1927 δημοσιεύσεων εντοπίστηκαν μετά από έρευνα σε 3 διαδικτυακές βιβλιοθήκες (MEDLINE, CENTRAL και EMBASE) και τελικά 28 δημοσιεύσεις και ένα σύνολο 2383 ασθενών συμπεριλήφθηκαν στη μελέτη
description: The master thesis entitled "A systematic review on the 30-day and 12-month survival of functional mitral regurgitation patients after percutaneous edge-to-edge mitral valve repair with MitraClip system" was undertaken as the final part of the "Medical Research Methodology" Master program of the Medical School of Aristotle University Thessaloniki for the years 2016-2018. Functional mitral valve regurgitation is a cardiac disease that affects millions of people worldwide, directly influencing their quality of life and their life expectancy. The MitraClip device (Abbott Vascular, Menlo Park, CA) is used for the percutaneous, edge-to-edge reconstruction of the mitral valve in patients with degenerative and functional mitral regurgitation. It is based on the Alfieri's "edge-to-edge" surgical technique. A total of 1927 publications were imported from 3 online databases (MEDLINE, CENTRAL and EMBASE) and finally 28 publications were included in the systematic review with a patient pool of 2383 patients. The current research project aims to examine the overall experience with the use of percutaneous edge-to-edge mitral valve repair system (Mitraclip), focusing in the 1-month and 1-year survival
Holographic Duals of Long Open Strings
Creators: name: Aharony, Ofer
name: Kutasov, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the holographic map between long open strings, which stretch between D-branes separated in the bulk space-time, and operators in the dual boundary theory. We focus on a generalization of the Sakai-Sugimoto holographic model of QCD, where the simplest chiral condensate involves an operator of this type. Its expectation value is dominated by a semi-classical string worldsheet, as for Wilson loops. We also discuss the deformation of the model by this operator, and in particular its effect on the meson spectrum. This deformation can be thought of as a generalization of a quark mass term to strong coupling. It leads to the first top-down holographic model of QCD with a non-Abelian chiral symmetry which is both spontaneously and explicitly broken, as in QCD. Other examples we study include half-supersymmetric open Wilson lines, and systems of D-branes ending on NS5-branes, which can be analyzed using worldsheet methods.
description: 35 pages, 4 figures, harvmac. v2: added references
ภาวะผู้นำเชิงกลยุทธ์ที่ส่งผลต่อความเป็นองค์การแห่งการเรียนรู้ขององค์การบริหารส่วนจังหวัดสงขลา
Creators: name: เมธี จันทโร
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: ภาวะผู้นำเชิงกลยุทธ์, ความเป็นองค์การแห่งการเรียนรู้, องค์การบริหารส่วนจังหวัดสงขลา, Strategic leadership, State of being learning organization, Songkhla provincial administrative organization

description: 2, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
ความแตกต่างของการเปลี่ยนแปลงนโยบายปราบปรามยาเสพติดของรัฐบาลอภิสิทธิ์และรัฐบาลยิ่งลักษณ์
Creators: name: นำพล สุวรรณกาศ
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: นโยบายปราบปรามยาเสพติด, รัฐบาลอภิสิทธ์, รัฐบาลยิ่งลักษณ์, Narcotics eradication policy, Abhisit's Administration, Yingluck's Administration

description: 2, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
การพัฒนาระบบการเรียนแบบกลุ่มสืบสอบบนแหล่งทรัพยากรด้านการศึกษาแบบเปิดเพื่อส่งเสริมการรู้สารสนเทศดิจิทัลและการรับรู้ทางจริยธรรมทางสารสนเทศของนิสิตนักศึกษาครุศาสตร์ศึกษาศาสตร์
Creators: name: สุกานดา จงเสริมตระกูล
name: ใจทิพย์ ณ สงขลา
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: การเรียนแบบกลุ่มสืบสอบ, แหล่งทรัพยากรด้านการศึกษาแบบเปิด, Group investigation, Open Educational Resources (OER)

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
Polarized radio emission from the magnetar XTE J1810-197
Creators: name: Camilo, F.
name: Reynolds, J.
name: Johnston, S.
name: Halpern, J. P.
name: Ransom, S. M.
name: van Straten, W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have used the Parkes radio telescope to study the polarized emission from the anomalous X-ray pulsar XTE J1810-197 at frequencies of 1.4, 3.2, and 8.4 GHz. We find that the pulsed emission is nearly 100% linearly polarized. The position angle of linear polarization varies gently across the observed pulse profiles, varying little with observing frequency or time, even as the pulse profiles have changed dramatically over a period of 7 months. In the context of the standard pulsar "rotating vector model," there are two possible interpretations of the observed position angle swing coupled with the wide profile. In the first, the magnetic and rotation axes are substantially misaligned and the emission originates high in the magnetosphere, as seen for other young radio pulsars, and the beaming fraction is large. In the second interpretation, the magnetic and rotation axes are nearly aligned and the line of sight remains in the emission zone over almost the entire pulse phase. We deprecate this possibility because of the observed large modulation of thermal X-ray flux. We have also measured the Faraday rotation caused by the Galactic magnetic field, RM = +77 rad/m^2, implying an average magnetic field component along the line of sight of 0.5 microG.
description: Accepted for publication in ApJ Letters. Six pages with 4 figures
การศึกษาระดับการรับรู้ ความพึงพอใจ และความคาดหวังต่อนโยบายส่งเสริมการอ่านเพื่อสร้างสังคมแห่งการเรียนรู้ตลอดชีวิต
Creators: name: วิยะดา กูโน
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: การรับรู้, ความพึงพอใจ, ความคาดหวัง, การอ่าน, Perception, Satisfaction, Expectation, Reading

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
Diffusion Anomaly in an Associating Lattice Gas Model
Creators: name: Szortyka, Marcia M.
name: Barbosa, Marcia C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate the relation between thermodynamic and dynamic properties of an associating lattice gas (ALG) model. The ALG combines a two dimensional lattice gas with particles interacting through a soft core potential and orientational degrees of freedom. From the competition between the directional attractive forces and the soft core potential results two liquid phases, double criticality and density anomaly. We study the mobility of the molecules in this model by calculating the diffusion constant at a constant temperature, $D$. We show that $D$ has a maximum at a density $ρ_{max}$ and a minimum at a density $ρ_{min}
description: 12 pages, 9 figures
อิทธิพลของวัฒนธรรมองค์กรและผู้นำเชิงปฏิรูปที่ส่งผลต่อสมรรถนะการบริหารทรัพยากรบุคคลเชิงกลยุทธ์ของสถาบันมะเร็งแห่งชาติ
Creators: name: พันทิภา สุวรรณโค
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: วัฒนธรรมองค์กร, ผู้นำเชิงปฏิรูป, สมรรถนะการบริหารทรัพยากรบุคคลเชิงกลยุทธ์, สถาบันมะเร็งแห่งชาติ, Organization culture, Transformational leadership, HR Scorecard, The national cancer institute

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
Bethe Ansatz for the Ruijsenaars Model of BC_1-Type
Creators: name: Chalykh, Oleg
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider one-dimensional elliptic Ruijsenaars model of type $BC_1$. It is given by a three-term difference Schrödinger operator $L$ containing 8 coupling constants. We show that when all coupling constants are integers, $L$ has meromorphic eigenfunctions expressed by a variant of Bethe ansatz. This result generalizes the Bethe ansatz formulas known in the $A_1$-case.
description: This is a contribution to the Vadim Kuznetsov Memorial Issue on Integrable Systems and Related Topics, published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Usages ethnovétérinaires des plantes médicinales dans la province du Haut-Katanga, RD Congo
Creators: name: Gaël, Nzuzi Mavungu
name: Victor, Okombe Embeya
Publisher: name: Zenodo
Year: 2019
Subjects: Ethnovétérinaire
Plantes médicinales
Haut-Katanga

description: Abstract Contexte et objectifs La phytothérapie vétérinaire comme alternative au traitement des maladies animales n’a pas été suffisamment explorée1,2. C’est dans cette perspective de valorisation des connaissances traditionnelles de la thérapeutique par les plantes sur les maladies animales que cette étude a été réalisée. Méthodologie Des enquêtes ethnobotaniques ont été conduites dans trois territoires de la province du Haut-Katanga dans le but de documenter les informations sur l’usage des plantes médicinales par les éleveurs pour soigner diverses pathologies rencontrées dans leurs élevages. La majorité des analyses statistiques descriptives des renseignements recueillis a été réalisée avec le logiciel R i386 3.5.1. permettant ainsi l’extrapolation de ces connaissances endogènes3. Résultats Un total de 62 espèces de plantes reparties en 57 genres et 36 familles botaniques ont été recensées auprès de 150 éleveurs. La famille des Fabaceae a été la plus utilisée, comprenant 22,58 % de l’effectif total. Le calcul de consensus d’informateur et de l’indice de fidélité a révélé que 8 espèces : Aloe greatheadii Schönland (Aloaceae), Annona senegalensis Pers. (Annonaceae), Bobgunnia madagascariensis (Desv.) J.H. Kirkbr. &Wiersema (Fabaceae), Hymenocardia acida Tul. (Phyllanthaceae), Kigelia africana Lam. Beenth. (Bignoniaceae), Pterocarpus tinctorius Welw (Fabaceae), Senna abbreviata Oliv. (Fabaceae) et Terminalia mollis M.A. Lawson (Combretaceae) sont fréquemment utilisées pour soigner une ou plusieurs affections animales. Les racines ont été plus fréquemment utilisées (25,87 %) et la macération (33,30 %) le mode de préparation de remèdes le plus administré. Ces plantes sont utilisées soit seules soit en combinaison avec d’autres plantes ou autres substances. Les pathologies les plus soignées sont celles de la sphère gastro-intestinale. Conclusion Ces usages ethnovétérinaires pourraient apporter une solution aux difficultés éprouvées par les éleveurs pour recourir aux pratiques vétérinaires modernes. Cependant, ces connaissances traditionnelles de traitement des pathologies chez les animaux dans la zone d’étude nécessitent des évaluations scientifiques plus avancées en termes des études phytochimiques et biologiques dans le but d’établir leur innocuité, efficacité ainsi que la production des nouveaux médicaments par les industries pharmaceutiques.
Bose-Einstein-condensed systems in random potentials
Creators: name: Yukalov, V. I.
name: Graham, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The properties of systems with Bose-Einstein condensate in external time-independent random potentials are investigated in the frame of a self-consistent stochastic mean-field approximation. General considerations are presented, which are valid for finite temperatures, arbitrary strengths of the interaction potential, and for arbitrarily strong disorder potentials. The special case of a spatially uncorrelated random field is then treated in more detail. It is shown that the system consists of three components, condensed particles, uncondensed particles and a glassy density fraction, but that the pure Bose glass phase with only a glassy density does not appear. The theory predicts a first-order phase transition for increasing disorder parameter, where the condensate fraction and the superfluid fraction simultaneously jump to zero. The influence of disorder on the ground-state energy, the stability conditions, the compressibility, the structure factor, and the sound velocity are analyzed. The uniform ideal condensed gas is shown to be always stochastically unstable, in the sense that an infinitesimally weak disorder destroys the Bose-Einstein condensate, returning the system to the normal state. But the uniform Bose-condensed system with finite repulsive interactions becomes stochastically stable and exists in a finite interval of the disorder parameter.
description: Latex file, final published variant
Repeated Sums and Binomial Coefficients
Creators: name: Haddad, Roudy El
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 05A10

description: Binomial coefficients have been used for centuries in a variety of fields and have accumulated numerous definitions. In this paper, we introduce a new way of defining binomial coefficients as repeated sums of ones. A multitude of binomial coefficient identities will be shown in order to prove this definition. Using this new definition, we simplify some particular sums such as the repeated Harmonic sum and the repeated Binomial-Harmonic sum. We derive formulae for simplifying general repeated sums as well as a variant containing binomial coefficients. Additionally, we study the $m$-th difference of a sequence and show how sequences whose $m$-th difference is constant can be related to binomial coefficients.
description: 21 pages
การสื่อสารในองค์การของศูนย์ปฏิบัติการโรงแรมศาลายา พาวิลเลียน
Creators: name: วิไลวรรณ ใจทัศน์กุล
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: สภาพการสื่อสารในองค์การ, กระบวนการสื่อสาร, ความแตกต่างของลักษณะทางประชากร, State of organization communication, Basis of communication process, Difference of personal

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
พฤติกรรมเลียนแบบกับค่านิยมการสักของวัยรุ่นหญิงในเขตกรุงเทพมหานคร
Creators: name: รัฐกานต์ กัณพิพัฒน์
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: พฤติกรรมการเลียนแบบ, ค่านิยมในการสัก, วัยรุ่นหญิง, Imitation, Tattoo ing values, Female-youth

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
Segmenting two-dimensional structures with strided tensor networks
Creators: name: Selvan, Raghavendra
name: Dam, Erik B
name: Petersen, Jens
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Tensor networks provide an efficient approximation of operations involving high dimensional tensors and have been extensively used in modelling quantum many-body systems. More recently, supervised learning has been attempted with tensor networks, primarily focused on tasks such as image classification. In this work, we propose a novel formulation of tensor networks for supervised image segmentation which allows them to operate on high resolution medical images. We use the matrix product state (MPS) tensor network on non-overlapping patches of a given input image to predict the segmentation mask by learning a pixel-wise linear classification rule in a high dimensional space. The proposed model is end-to-end trainable using backpropagation. It is implemented as a Strided Tensor Network to reduce the parameter complexity. The performance of the proposed method is evaluated on two public medical imaging datasets and compared to relevant baselines. The evaluation shows that the strided tensor network yields competitive performance compared to CNN-based models while using fewer resources. Additionally, based on the experiments we discuss the feasibility of using fully linear models for segmentation tasks.
description: Accepted to be presented at the 27th international conference on Information Processing in Medical Imaging (IPMI-2021), Bornholm, Denmark. Source code at https://github.com/raghavian/strided-tenet. Version 2: Minor fixes to notation in Eq.1 and typos
A Cold Nearby Cloud Inside the Local Bubble
Creators: name: Meyer, David M.
name: Lauroesch, J. T.
name: Heiles, Carl
name: Peek, J. E. G.
name: Engelhorn, Kyle
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The high-latitude Galactic H I cloud toward the extragalactic radio source 3C 225 is characterized by very narrow 21 cm emission and absorption indicative of a very low H I spin temperature of about 20 K. Through high-resolution optical spectroscopy, we report the detection of strong, very narrow Na I absorption corresponding to this cloud toward a number of nearby stars. Assuming that the turbulent H I and Na I motions are similar, we derive a cloud temperature of 20 (+6, -8) K (in complete agreement with the 21 cm results) and a line-of-sight turbulent velocity of 0.37+/-0.08 km/s from a comparison of the H I and Na I absorption linewidths. We also place a firm upper limit of 45 pc on the distance of the cloud, which situates it well inside the Local Bubble in this direction and makes it the nearest-known cold diffuse cloud discovered to date.
description: 11 pages, 3 figures, accepted for publication in ApJ Letters
A JT supergravity as a double-cut matrix model
Creators: name: Johnson, Clifford V.
name: Rosso, Felipe
name: Svesko, Andrew
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study a Jackiw-Teitelboim (JT) supergravity theory, defined as an Euclidean path integral over orientable supermanifolds with constant negative curvature, that was argued by Stanford and Witten to be captured by a random matrix model in the $\boldsymbolβ{=}2$ Dyson-Wigner class. We show that the theory is a double-cut matrix model tuned to a critical point where the two cuts coalesce. Our formulation is fully non-perturbative and manifestly stable, providing for explicit unambiguous computation of observables beyond the perturbative recursion relations derivable from loop equations. Our construction shows that this JT supergravity theory may be regarded as a particular combination of certain type 0B minimal string theories, and is hence a natural counterpart to another family of JT supergravity theories recently shown to be built from type 0A minimal strings. We conjecture that certain other JT supergravities can be similarly defined in terms of double-cut matrix models.
description: 8 pages and 10 figures. v2: Corrected the computation of macroscopic loop insertions, and discussion. Most important results qualitatively unchanged
Approach to jamming in an air-fluidized granular bed
Creators: name: Abate, A. R.
name: Durian, D. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Quasi-2D bidisperse amorphous systems of steel beads are fluidized by a uniform upflow of air, so that the beads roll on a horizontal plane. The short-time ballistic motion of the beads is stochastic, with non-Gaussian speed distributions and with different average kinetic energies for the two species. The approach to jamming is studied as a function of increasing bead area fraction and also as a function of decreasing air speed. The structure of the system is measured in terms of both the Voronoi tessellation and the pair distribution function. The dynamics of the system is measured in terms of both displacement statistics and the density of vibrational states. These quantities all exhibit tell-tale features as the dynamics become more constrained closer to jamming. Though the system is driven and athermal, the behavior is remarkably reminiscent of that in dense colloidal suspensions and supercooled liquids.
description: experiment
BKZ algorithm revisited
Creators: name: Χατζής, Νικόλαος Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Αναγωγή πλεγμάτων
Αλγόριθμος ΒΚΖ
Πλέγματα
Lattice reduction
BKZ algorithm
Extreme pruning
4.SVP

description: Στην παρούσα διπλωματική εργασία περιγράφουμε τον αλγόριθμο extreme pruning, αυτήν την στιγμή τον πιο αποδοτικό αλγόριθμο για την λύση του SVP. Ακόμα περιγράφουμε τους αλγόριθμους BKZ 2.0 και progressive BKZ αυτήν την στιγμή τους πιο αποδοτικούς αλγόριθμους για την αναγωγή ενός πλέγματος. Επίσης, παρουσιάζουμε έναν αλγόριθμο που χρησιμοποιείται για την στοχευμένη τυχαιοποίηση-προεπεξεργασία μιας βάσης ενός πλέγματος, ο οποίος έχει χρόνο εκτέλεσης ανεξάρτητο σε σχέση με την διάσταση του πλέγματος. Τέλος, παρουσιάζουμε μια παραλλαγή του αλγόριθμου extreme-pruning η οποία χρησιμοποιεί σαν υπορουτίνα τον αλγόριθμό μας
description: In the present thesis we describe the extreme pruning algorithm, the currently most efficient algorithm for solving the SVP. We also describe the BKZ 2.0 algorithm and the progressive BKZ algorithm, the currently most efficient lattice reduction algorithms. We present a targeted randomization-preprocessing algorithm, which takes as input a reduced lattice basis and outputs another reduced basis of the lattice. Then, we describe its running time, which is independent of the lattice dimension. Finally, we present and analyze a variation of the extreme pruning algorithm, which uses our randomization-preprocessing algorithm as a subroutine
Femtosecond LIPSS on indium-tin-oxide thin films at IR wavelengths
Creators: name: Banhegyi, Balazs
name: Peter, Laszlo
name: Dombi, Peter
name: Papa, Zsuzsanna
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We investigated laser-induced periodic surface structures (LIPSS) generated on indium-tin-oxide (ITO) thin films with femtosecond laser pulses in the infrared region. Using pulses between 1.6 and 2.4 $μ$m central wavelength, we observed robust LIPSS morphologies with a periodicity close to $λ$/10. Supporting finite-difference time-domain calculations suggest that the surface forms are rooted in the field localization in the surface pits leading to a periodically increased absorption of the laser pulse energy that creates the observed periodic structures.
ปัจจัยเชิงสาเหตุที่มีอิทธิพลต่อพฤติกรรมการบริโภคอาหารที่ถูกสุขลักษณะของพระสงฆ์ในเขตจังหวัดนครปฐม
Creators: name: พระชุมพล ตันวัฒนเสรี
name: ลุยง วีระนาวิน
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: ปัจจัยทางจิตวิทยา, พฤติกรรมการฉันอาหาร, Psychological factors, The behaviour of ingestion

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
SDSS 1507+02: A Halo Cataclysmic Variable?
Creators: name: Patterson, J.
name: Thorstensen, J. R.
name: Knigge, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report a photometric and spectroscopic study of the peculiar cataclysmic variable SDSS 1507+52. The star shows very deep eclipses on the 67 minute orbital period, and those eclipses are easily separable into white-dwarf and hot-spot components. This leads to tight constraints on binary parameters, with M_1=0.83(8) solar masses, M_2=0.057(8) solar masses, R_1=0.0097(9) solar radii, R_2=0.097(4) solar radii, q=0.069(2), and i=83.18(13) degrees. Such numbers suggest possible membership among the WZ Sge stars, a common type of dwarf nova. The spectroscopic behavior (strong and broad H emission, double-peaked and showing a classic rotational disturbance during eclipse) is also typical. But the star's orbital period is shockingly below the "period minimum" of approximately 77 min which is characteristic of hydrogen-rich CVs; producing such a strange binary will require some tinkering with the theory of cataclysmic-variable evolution. The proper motion is also remarkably high for a star of its distance, which we estimate from photometry and trigonometric parallax as 230 +- 40 pc. This suggests a transverse velocity of 164 +- 30 km/s - uncomfortably high if the star belongs to a Galactic-disk population. These difficulties with understanding its evolution and space velocity can be solved if the star belongs to a Galactic-halo population.
description: 31 pages; 11 figures. Accepted by Publications of the Astronomical Society of the Pacific
Η Περί Θεού διδασκαλία σύμφωνα με τους Λόγους Κατά Ανομοίων του Αγίου Ιωάννη του Χρυσοστόμου
Creators: name: Γκατζής, Γεώργιος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Αρειανισμός, Ανόμοιοι, Αίρεση, Χρυσόστομος, Ακατάληπτο, ουσία, ενέργειες
Arianism, Anomeans, Heresy, Chrysostom, incomprehensibity of God, essence, energies

description: Η αίρεση του αρειανισμού ταλαιπώρησε το εκκλησιαστικό σώμα για περισσότερο από έναν αιώνα. Η Εκκλησία αφιέρωσε δύο οικουμενικές συνόδους για να αντιμετωπίσει τον αρειανισμό και τα παρακλάδια του. Η πρώτη οικουμενική σύνοδος (325) συνέταξε τα πρώτα επτά άρθρα του συμβόλου της πίστεως και η δεύτερη (381) ολοκλήρωσε το έργο της πρώτης δίνοντας το γνωστό σύμβολο Νικαίας- Κωνστατνινουπόλεως, το οποίο κατά βάση αντιμετώπισε τον αρειανισμό σε κάθε του έκφραση. Αρκετοί πατέρες της Εκκλησίας έγραψαν κατά του Αρείου και των οπαδών του. Ο άγιος Ιωάννης ο Χρυσόστομος ασχολήθηκε με την ακραία μορφή του αρειανισμού δηλαδή με την ομάδα των ανομοίων. Οι ανόμοιοι είχαν σπάσει το σύνδεσμο οντολογίας και γνωσιολογίας και διατείνονταν πως μπορεί ο άνθρωπος να γνωρίζει την ουσία του Θεού. Η ουσία του Θεού όμως για τον άγιο πατέρα παραμένει ακατάληπτη για τον κτιστό άνθρωπο, όπως και παρά πολλά εξάλλου μυστήρια της φύσης. Ο κτιστός άνθρωπος αδυνατεί να γνωρίσει τα μυστικά του κτιστού κόσμου που τον περιβάλλει, πως είναι δυνατόν να γνωρίσει το Θεό και την ουσία του
description: The heresy of arianism provocated the christian church more of one century. The church fathers worked in the two ecumenical councils, the first (325) and the second (381) to the perspective to explain the heretical caracter of Arius and his opponents. John Chrysostom deals with the anomeans, the strong arians. The anomeans believed that the man can know the essence of God. According John Chrysostom the essence of God stay in the incomprehensibility. The created man hasnot the presupositions to Know the nature of God. Many mysteries in the created word stay without explanation. In this case, how it’s possible to man to know the essence of God?
Empirical Evidence for a Money Demand Function in Southeast Asian Countries: A Panel Data Analysis
Creators: name: Hussin Abdullah
name: Jachari Dahlan
name: Hidthir, Helmi
Publisher: name: Yala Rajabhat University
Year: 2010
Subjects: Demand for Money, Panel Cointegration, FMOLS, Southeast Asian

description: 1, 5, Journal of Yala Rajabhat University
Comment on "The gravitomagnetic influence on gyroscopes and on the lunar orbit"
Creators: name: Kopeikin, Sergei M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Analysis of the gauge residual freedom in the relativistic theory of lunar motion demonstrates that lunar laser ranging (LLR) is not currently capable to detect gravitomagnetic effects.
description: 1 page, accepted to Physical Review Letters
Mapping flows on weighted and directed networks with incomplete observations
Creators: name: Smiljanić, Jelena
name: Blöcker, Christopher
name: Edler, Daniel
name: Rosvall, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Detecting significant community structure in networks with incomplete observations is challenging because the evidence for specific solutions fades away with missing data. For example, recent research shows that flow-based community detection methods can highlight spurious communities in sparse undirected and unweighted networks with missing links. Current Bayesian approaches developed to overcome this problem do not work for incomplete observations in weighted and directed networks that describe network flows. To address this gap, we extend the idea behind the Bayesian estimate of the map equation for unweighted and undirected networks to enable more robust community detection in weighted and directed networks. We derive a weighted and directed prior network that can incorporate metadata information and show how an efficient implementation in the community-detection method Infomap provides more reliable communities even with a significant fraction of data missing.
Media use, political efficacy and participation
Creators: name: Μελίαδης, Παναγιώτης Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Κοινωνικά Μέσα Δικτύωσης
Πολιτική αποτελεσματικότητα
Πολιτική συμμετοχή
Social media
Political efficacy
Political participation

description: Despite the fact that the effects of the use of the Internet on the political engagement and political participation of citizens seem to be positive, however, the introduction of internet, as a new mean of mass media communication, created a lot of hopes concerning the freedom of speech and press, respectively. Without any doubt the rise of Web 2.0 radically changed the communication landscape; and nowadays, more and more people engange in social media usage for several reasons. In particular, concerning the present dissertation, it is a study of the role of the mass media use, the political efficacy and participation. It explores the importance of media use to perceptions of political efficacy and intentions of political participation, understanding, thus, deeper relationship between media use and perceived political efficacy, as well as the relationship between media use and political participation. Furthermore, on the methodology, it is based on the quantitative approach of questionnaire filling by 250 Greek people they are analyzed through the statistical method of SPSS. Finally, on the content of the present research study, beside the introductory text, are followed four chapters and the final conclusions.
description: Παρόλου που η επίδραση του διαδικτύου στην πολιτική αλληλεπίδραση και την πολιτική συμμετοχή των πολιτών φαίνεται να είναι θετική, η εισαγωγή του διαδικτύου σαν ένα νέο μέσο μαζικής επικοινωνίας, δημιούργησε πολλές ελπίδες σχετικά με την ελευθερία του λόγου και του τύπου. Χωρίς καμία αμφιβολία η ανάπτυξη του Διαδικτύου 2.0 καθόρισε ριζικά την επιρροή του πεδίου της επικοινωνίας, καθώς στις μέρες μας όλο και περισσότεροι άνθρωποι αλληλεπιδρούν με τα κοινωνικά μέσα δικτύωσης για διάφορους λόγους. Πιο συγκεκριμένα, η παρούσα έρευνα, αναφέρεται στο ρόλο των μέσων μαζικής επικοινωνίας στην πολιτική αποτελεσματικότητα και την πολιτική συμμετοχή. Ερευνά τη σημαντικότητα των μέσων επικοινωνίας στην αντίληψη του κόσμου στην πολιτική αποτελεσματικότητα και πολιτική συμμετοχή, προσπαθόντας να καταλάβει βαθύτερα τη σχέση ανάμεσα στην κατανάλωση νέων από τα μέσα μαζικής επικοινωνίας και την πολιτική αποτελεσματικότητα και συμμετοχή. Έπειτα, η εμπιρική έρευνα βασίζεται σε ερωτηματολόγιο που συμπλήρωσαν 250 Έλληνες συμμετέχοντες, τα αποτέσματα του οποίου αναλύθηκαν εις βάθος με τη χρήση του SPSS. Τέλος, το περιεχόμενο της έρευνας, εκτός από το εισαγωγικό κείμενο, καλύπτει τέσσερα υποκεφάλαια και συμπεράσματα.
Interstellar medium disruption in the Centaurus A group
Creators: name: Bouchard, A.
name: Jerjen, H.
name: Da Costa, G. S.
name: Ott, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of a 21 cm neutral hydrogen (HI) line detection experiment in the direction of 18 low luminosity dwarf galaxies of the Centaurus A group, using the Australia Telescope National Facility 64m Parkes Radio Telescope and the Australia Telescope Compact Array. Five dwarfs have HI masses between M_HI=4x10^5 to M_HI=2.1x10^7 Msol and 0.0410^7 Msol or M_HI<10^6 Msol. This gap may be explained by the ram pressure stripping mechanism at work in this dense environment where all galaxies with M_HI<10^7 Msol have been stripped of their gas. The required intergalactic medium density to achieve this is ~10^-3 cm^-3.
description: 7 figures, 2 tables
Periodic Fast Radio Bursts from Luminous X-ray Binaries
Creators: name: Sridhar, Navin
name: Metzger, Brian D.
name: Beniamini, Paz
name: Margalit, Ben
name: Renzo, Mathieu
name: Sironi, Lorenzo
name: Kovlakas, Konstantinos
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The discovery of periodicity in the arrival times of the fast radio bursts (FRBs) poses a challenge to the oft-studied magnetar scenarios. However, models that postulate that FRBs result from magnetized shocks or magnetic reconnection in a relativistic outflow are not specific to magnetar engines; instead, they require only the impulsive injection of relativistic energy into a dense magnetized medium. Motivated thus, we outline a new scenario in which FRBs are powered by short-lived relativistic outflows (``flares'') from accreting black holes or neutron stars, which propagate into the cavity of the pre-existing (``quiescent'') jet. In order to reproduce FRB luminosities and rates, we are driven to consider binaries of stellar-mass compact objects undergoing super-Eddington mass-transfer, similar to ultraluminous X-ray (ULX) sources. Indeed, the host galaxies of FRBs, and their spatial offsets within their hosts, show broad similarities with ULXs. Periodicity on timescales of days to years could be attributed to precession (e.g., Lens-Thirring) of the polar accretion funnel, along which the FRB emission is geometrically and relativistically beamed, which sweeps across the observer line of sight. Accounting for the most luminous FRBs via accretion power may require a population of binaries undergoing brief-lived phases of unstable (dynamical-timescale) mass-transfer. This will lead to secular evolution in the properties of some repeating FRBs on timescales of months to years, followed by a transient optical/IR counterpart akin to a luminous red nova, or a more luminous accretion-powered optical/X-ray transient. We encourage targeted FRB searches of known ULX sources.
description: Accepted for publication in The Astrophysical Journal; 25 pages, 8 figures
Spin Dependent Gravitational Tail Memory in $D=4$
Creators: name: Ghosh, Debodirna
name: Sahoo, Biswajit
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We derive the leading spin-dependent gravitational tail memory, which appears at the second post-Minkowskian (2 PM) order and behaves as $u^{-2}$ for large retarded time $u$. This result follows from classical soft graviton theorem at order $ω\lnω$ as a low-frequency expansion of gravitational waveform with frequency $ω$. First, we conjecture the result from the classical limit of quantum soft graviton theorem up to sub-subleading order in soft expansion and then we derive it for a classical scattering process without any reference to the soft graviton theorem. The final result of the gravitational waveform in the direct derivation completely agrees with the conjectured result.
description: 42 pages, 2 figures. The discrepancy between conjectured result and the result of direct derivation has been resolved
On relaxation processes in collisionless mergers
Creators: name: Valluri, Monica
name: Vass, Ileana M.
name: Kazantzidis, Stelios
name: Kravtsov, Andrey V.
name: Bohn, Courtlandt L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze N-body simulations of halo mergers to investigate the mechanisms responsible for driving mixing in phase-space and the evolution to dynamical equilibrium. We focus on mixing in energy and angular momentum and show that mixing occurs in step-like fashion following pericenter passages of the halos. This makes mixing during a merger unlike other well known mixing processes such as phase mixing and chaotic mixing whose rates scale with local dynamical time. We conclude that the mixing process that drives the system to equilibrium is primarily a response to energy and angular momentum redistribution that occurs due to impulsive tidal shocking and dynamical friction rather than a result of chaotic mixing in a continuously changing potential. We also analyze the merger remnants to determine the degree of mixing at various radii by monitoring changes in radius, energy and angular momentum of particles. We confirm previous findings that show that the majority of particles retain strong memory of their original kinetic energies and angular momenta but do experience changes in their potential energies owing to the tidal shocks they experience during pericenter passages. Finally, we show that a significant fraction of mass (~ 40%) in the merger remnant lies outside its formal virial radius and that this matter is ejected roughly uniformly from all radii outside the inner regions. This highlights the fact that mass, in its standard virial definition, is not additive in mergers. We discuss the implications of these results for our understanding of relaxation in collisionless dynamical systems.
description: Version accepted for Publication in Astrophysical Journal, March 20, 2007, v685. Minor changes, latex, 14 figures
การประเมินผลโครงการอุปสมบทหมู่ภาคฤดูร้อน 100,000 รูป ทุกหมู่บ้านทั่วไทย ประจำปีพุทธศักราช 2556: กรณีศึกษาศูนย์อบรมวัดพระธรรมกาย จังหวัดปทุมธานี
Creators: name: วีรวัชร์ ไชยาศรี
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: การประเมินโครงการ, อุปสมบทหมู่ภาคฤดูร้อน 100,000 รูป ทุกหมู่บ้านทั่วไทย, Project evaluation, 100000 monk summer mass ordination from every village across Thailand Project

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
ผลสัมฤทธิ์กิจกรรมชุมนุมกีฬาเปตองของโรงเรียนขยายโอกาสทางการศึกษาแห่งเดียวในเขตบางพลัด สังกัดกรุงเทพมหานคร
Creators: name: ธนัทอร อนุรักษ์ไพศาล
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: ผลสัมฤทธิ์, กิจกรรมชุมนุมกีฬาเปตอง, Achievement, Petanque activity

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
Decaying Clipping Range in Proximal Policy Optimization
Creators: name: Farsang, Mónika
name: Szegletes, Luca
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Proximal Policy Optimization (PPO) is among the most widely used algorithms in reinforcement learning, which achieves state-of-the-art performance in many challenging problems. The keys to its success are the reliable policy updates through the clipping mechanism and the multiple epochs of minibatch updates. The aim of this research is to give new simple but effective alternatives to the former. For this, we propose linearly and exponentially decaying clipping range approaches throughout the training. With these, we would like to provide higher exploration at the beginning and stronger restrictions at the end of the learning phase. We investigate their performance in several classical control and locomotive robotic environments. During the analysis, we found that they influence the achieved rewards and are effective alternatives to the constant clipping method in many reinforcement learning tasks.
Chromo-polarizability and pipi final state interaction
Creators: name: Guo, Feng-Kun
name: Shen, Peng-Nian
name: Chiang, Huan-Ching
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The chromo-polarizability of a quarkonium state is a measure of the amplitude of the $E1$-$E1$ chromo-electric interaction of the quarkonium with soft gluon fields and can be measured in the heavy quarkonium decays. Based on the chiral unitary approach, formulas with modification caused by the $S$ wave $ππ$ final state interaction (FSI) for measuring the chromo-polarizabilities are given. It is shown that the effect of the $S$ wave $ππ$ FSI is very important in extracting chromo-polarizabilities from the experimental data. The resultant values with the FSI are reduced to about 1/3 of those determined without the FSI. The consequences of the FSI correction in the $J/ψ$-nucleon scattering near the threshold are also discussed. The estimated lower bound of the total cross section is reduced from about 17 mb to 2.9 mb, which agrees with the experimental data point and is compatible with the previously estimated values in the literature. In order to understand the interaction of heavy quarkonia with light hadrons at low energies better and to obtain the chromo-polarizabilities of quarkonia accurately, more data should be accumulated. This can be done in the $J/ψ\to π^+π^-l^+l^-$ decay at BES-III and CLEO-c and in the $Υ\to π^+π^-l^+l^-$ decay at B factories.
description: 5 pages, 3 figures, ReVTeX4. Version accepted for publication in Phys. Rev. D
การศึกษาเปรียบเทียบการบริหารจัดการโครงการกองทุนหมู่บ้านและชุมชนเมืองในจังหวัดสมุทรปราการ
Creators: name: ภาคภูมิ พู่สกุลสถาพร
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: การนำนโยบายไปปฏิบัติ, การศึกษาเปรียบเทียบนโยบาย, Policy implementation, Comparative study of policies

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
Fodder production and conservation practices for smallholder dairy farmers in the Imbo plain of Burundi
Creators: name: Francine Ahimpera*
name: Napoleon Munyaneza
name: Albert Iribagiza
name: Godfrey Jabulani Manyawu
name: Lionel Nyabongo
name: Anthony Macharia King'ori
Publisher: name: Zenodo
Year: 2024
Subjects: Livestock, feed scarcity, milk production, season, smallholder income, Burundi.

description: Abstract: The study was conducted on 384 smallholder dairy farms located in five Provinces of the Imbo Plain of Burundi. It assessed the status of livestock feeding and identified potential dry season feed interventions by smallholder dairy farmers. A survey using a structured questionnaire was used to collect information on fodder production, fodder conservation, feeding management, feed resources, and marketing. The Kobo collect tool was used to facilitate the activity. Data were analyzed using IBM SPSS Statistics 20 software. Quantitative data were analyzed using descriptive statistics while qualitative data were analyzed using the association of some variables by using cross-tabulations. Results from the study showed a high level of availability of natural fodder (96.9%) and established fodder (94.5%) during the wet season with scarcity during the dry season (87.2% and 85.7% respectively). It was observed that there was a low level of adoption of fodder conservation and marketing. The study concluded that the low adoption level of fodder production, conservation, and marketing practices may be a result of the low education level and consequently increased poverty among smallholder dairy farmers. To prevent dry season feed scarcity, smallholder dairy farmers, were encouraged to adopt new technologies of conservation of surplus fodder available in the wet Season. They were also inducted to new technologies of treating crop residues for use as animal feed during the dry season period.
Form factors of integrable Heisenberg (higher) spin chains
Creators: name: Castro-Alvaredo, O. A.
name: Maillet, J. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present determinant formulae for the form factors of spin operators of general integrable XXX Heisenberg spin chains for arbitrary (finite dimensional) spin representations. The results apply to any "mixed" spin chains, such as alternating spin chains, or to spin chains with magnetic impurities.
description: 24 pages
การบริหารงานตามหลักธรรมาภิบาลขององค์การบริหารส่วนตำบลคลองสาม อำเภอคลองหลวง จังหวัดปทุมธานี
Creators: name: วาสนา ประเสริฐ
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2014
Subjects: การบริหาร, ธรรมาภิบาล, Administration, Good Governance

description: 3, 25, วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์
Andromeda XXI -- a dwarf galaxy in a low density dark matter halo
Creators: name: Collins, Michelle L. M.
name: Read, Justin I.
name: Ibata, Rodrigo A.
name: Rich, R. Michael
name: Martin, Nicolas F.
name: Peñarrubia, Jorge
name: Chapman, Scott C.
name: Tollerud, Erik J.
name: Weisz, Daniel R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Andromeda XXI (And XXI) has been proposed as a dwarf spheroidal galaxy with a central dark matter density that is lower than expected in the Standard $Λ$ Cold Dark Matter ($Λ$CDM) cosmology. In this work, we present dynamical observations for 77 member stars in this system, more than doubling previous studies to determine whether this galaxy is truly a low density outlier. We measure a systemic velocity of $v_r=-363.4\pm1.0\,{\rm kms}^{-1}$ and a velocity dispersion of $σ_v=6.1^{+1.0}_{-0.9}\,{\rm kms}^{-1}$, consistent with previous work and within $1σ$ of predictions made within the modified Newtonian dynamics framework. We also measure the metallicity of our member stars from their spectra, finding a mean value of ${\rm [Fe/H]}=-1.7\pm0.1$~dex. We model the dark matter density profile of And~XXI using an improved version of \GravSphere, finding a central density of $ρ_{\rm DM}({\rm 150 pc})=2.7_{-1.7}^{+2.7} \times 10^7 \,{\rm M_\odot\,kpc^{-3}}$ at 68\% confidence, and a density at two half light radii of $ρ_{\rm DM}({\rm 1.75 kpc})=0.9_{-0.2}^{+0.3} \times 10^5 \,{\rm M_\odot\,kpc^{-3}}$ at 68\% confidence. These are both a factor ${\sim}3-5$ lower than the densities expected from abundance matching in $Λ$CDM. We show that this cannot be explained by `dark matter heating' since And~XXI had too little star formation to significantly lower its inner dark matter density, while dark matter heating only acts on the profile inside the half light radius. However, And~XXI's low density can be accommodated within $Λ$CDM if it experienced extreme tidal stripping (losing $>95\%$ of its mass), or if it inhabits a low concentration halo on a plunging orbit that experienced repeated tidal shocks.
description: Accepted to MNRAS, 17 pages, 12 figures