cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum resistance metrology using graphene
Creators: name: Janssen, T. J. B. M.
name: Tzalenchuk, A.
name: Lara-Avila, S.
name: Kubatkin, S.
name: Fal'ko, V. I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this paper we review the recent extraordinary progress in the development of a new quantum standard for resistance based on graphene. We discuss the unique properties of this material system relating to resistance metrology and discuss results of the recent highest-ever precision direct comparison of the Hall resistance between graphene and traditional GaAs. We mainly focus our review on graphene expitaxially grown on SiC, a system which so far resulted in the best results. We also brie y discuss progress in the two other graphene material systems, exfoliated graphene and chemical vapour deposition graphene, and make a critical comparison with SiC graphene. Finally we discuss other possible applications of graphene in metrology.
description: arXiv admin note: substantial text overlap with arXiv:1202.2985
A Typology of Parental Involvement in Student Experience: A Latent Class Analysis
Creators: name: Bowers, Alex J.
name: Zhou, Xiaoliang
Publisher: name: Columbia University
Year: 2020
Subjects: Education, Secondary
Education--Parent participation
High school students
Academic achievement

description: We examine the extent to which there are significantly different types of Parental Involvement in student’s high school experience, and what the relationship of these different types may be to long-term student outcomes, such as high school graduation, college going, and specifically for this study, STEM career outcomes. With the dataset the Education Longitudinal Study of 2002 (ELS:2002) which includes 11,727 parents of high school students in the United States, we examine how parents interact with students and schools using Latent Class Analysis (LCA). We identify three significantly different subgroups of parent involvement: Guiding (44.2%), Lenient (22.3%), and Advocate (33.5%). Parental context and demographic factors, such as gender and ethnicity, and school variables, such as private status and school size, are significantly associated with membership across subgroups, which in turn are related to students’ education outcomes, such as college enrollment and selection of a STEM career versus other career outcomes.
Novel discrete symmetries in the general N = 2 supersymmetric quantum mechanical model
Creators: name: Kumar, R.
name: Malik, R. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In addition to the usual supersymmetric (SUSY) continuous symmetry transformations for the general N = 2 SUSY quantum mechanical model, we show the existence of a set of novel discrete symmetry transformations for the Lagrangian of the above SUSY quantum mechanical model. Out of all these discrete symmetry transformations, a unique discrete transformation corresponds to the Hodge duality operation of differential geometry and the above SUSY continuous symmetry transformations (and their anticommutator) provide the physical realizations of the de Rham cohomological operators of differential geometry. Thus, we provide a concrete proof of our earlier conjecture that any arbitrary N= 2 SUSY quantum mechanical model is an example of a Hodge theory where the cohomological operators find their physical realizations in the language of symmetry transformations of this theory. Possible physical implications of our present study are pointed out, too.
description: LaTeX file, 9 pages, EPJC format, To appear in EPJC
Post-traumatic diaphragmatic hernia. A case report
Creators: name: Rito Jafeth Medellin M.D.
name: Mohamed Ivan Gamez M.D.
name: Aylin Montserrath Del Angel M.D.
name: Nelson Alexander Cisneros M.D.
name: Valeria Avendaño M.D.
Publisher: name: Zenodo
Year: 2023

description: Background
Post traumatic diaphragmatic hernia is a rare entity that is usually discovered incidentally. Most patients present with respiratory distress symptoms and signs of intestinal occlusion. Most diaphragmatic hernias are caused in their majority by penetrating trauma rather than blunt trauma. The most herniated organ reported in acute presentation is the stomach followed by omentum. The most herniated organ in chronic presentation is the colon followed by omentum and stomach (1). We present the case report of a 40 year old male with a previous history of 3 year old penetrating abdominal trauma caused by a knife which was treated with conservatory treatment. He presented to the emergency department referring 24-hour history of heartburn, oppressive pain in the epigastrium and left hypochondrium, On examination abdomen presented absence of peristalsis, involuntary rigidity and general abdominal tenderness. A chest X-ray was performed where we could appreciate elevation of the left hemidiaphragm, due to this finding an abdominal Ct scan was ordered to complete the formal examination which revealed presence of intestine loops passing through the left diaphragm in the left hemithorax. A exploratory laparotomy was performed finding the left colonic flexure and part of the major omentum incarcerated in left diaphragm defect, the intestinal loops were reduced and due to its lack of vascularity and tone, it was decided to perform and end colostomy and closure of the distal end with a Hartmann's pouch, the diaphragm defect was closed with interrupted mattress suture of prolene 2/0, a left thoracostomy tube was installed due to pneumothorax produced at the time of hernia reduction. Patient was discharge 72 hours after surgery after removal of thoracostomy tube and progression of oral intake.
Keywords: Diaphragmatic hernia.
title: «Mία σκηνοθετημένη ζωή με φόντο την αρχιτεκτονική»: το παράδειγμα των «Case Study Houses» όπως εμφανίζεται στην αρχιτεκτονική φωτογραφία του Julius Shulman
Creators: name: Γιαννακη Κωνσταντινα
Publisher: name: Technical University of Crete
Year: 2019

description: Η εισαγωγή της φωτογραφίας στην αρχιτεκτονική του 20ου αιώνα και η χρήση της στα μέσα μαζικής ενημέρωσης συνέβαλε στην διάχυση της αρχιτεκτονικής και  μετέτρεψε το αρχιτεκτόνημα σε καταναλωτικό προϊόν. Επιπλέον προώθησε έναν εξιδανικευμένο τρόπο ζωής, κάτι που χαρακτηρίζει τη σημερινή κοινωνία, διαταράσσοντας ταυτόχρονα την σχέση ανάμεσα  στην εικονική και  την πραγματική απτή αρχιτεκτονική.
  Κατά τη διάρκεια των μεταπολεμικών χρόνων, ο Μοντερνισμός εξαπλώθηκε από την Ευρώπη στις Ηνωμένες Πολιτείες της Αμερικής. Το 1945 ανακοινώθηκε το πρόγραμμα ‘’Case Study Houses’’ από το περιοδικό ‘’Αrts and Architecture’’.  Το έργο οραματίστηκε ο Entenza, εκδότης και συντάκτης του περιοδικού, ως το μέλλον της αμερικανικής στέγασης και έναν τρόπο βελτίωσης της ποιότητας ζωής με ένα «καλό και μοντέρνο σχεδιασμό». Ο Julius Shulman ήταν ο φωτογράφος ο οποίος επιλέχθηκε από τον Εtenza για να προωθήσει το πρόγραμμα με τη χρήση της στυλιζαρισμένης αρχιτεκτονικής φωτογραφίας.  Άραγε το πρόγραμμα έψαχνε λύση στο στεγαστικό πρόβλημα ή υπήρχε μια βαθύτερη αναζήτηση για την δημιουργία ταυτότητας της μεταπολεμικής Αμερικής; Κατάφερε τελικά να αλλάξει η σχέση της αρχιτεκτονικής με τις μάζες μέσω της προβολής της στα περιοδικά; Η προβολή των ‘’Case Study Houses’’  στο περιοδικό ‘’Αrts and Architecture’’ αποτέλεσε διαφήμιση για τις ίδιες τις κατοικίες, ή αυτές μετατράπηκαν σε ένα εκθεσιακό χώρο για τα παραπροϊόντα της αρχιτεκτονικής;
  Σκοπός της ερευνητικής εργασίας είναι η διερεύνηση του τρόπου με τον οποίο η αρχιτεκτονική συμμετέχει στην προβολή ενός συγχρόνου τρόπου ζωής όπως εμφανίζεται στην αρχιτεκτονική φωτογραφία του Julius Shulman για το πρόγραμμα ‘’Case study Houses’’ καθώς και η εκλαΐκευση της με σκοπό την προώθηση αυτής σε ένα ευρύ καταναλωτικό κοινό.
Effects of State and Local Regulations on Interstate Movement of Agricultural Products by Highway
Creators: name: Ayre, Josephine
name: Ayre, Josephine
Publisher: name: Unknown
Year: 1961
Subjects: subject: Agricultural and Food Policy
subject: Marketing
subject: FOS: Economics and business
subject: Political Economy

description: Excerpts from the report Introduction: This study was initiated as a result of recommendations of the Advisory Committee to the USDA on transportation research and the concern of farm organizations and others about the effects of varying regulations and tax levying measures among the States upon the marketing and costs of movement of products of agriculture transported by motortruck. Motortrucks carry a large proportion of the agricultural products, and the efficient performance of this agency of transportation is of vital importance to agriculture. In recognition of the need for flexibility in the marketing of farm products, Federal law exempts interstate truck transportation of these commodities from economic regulation by the Interstate Commerce Commission. The purpose of this study is not to criticize the legislative or administrative policies of any individual State, but to bring out the cumulative effects upon shippers and motor carriers of varying policies by the many States through which individual interstate carriers transport agricultural products to market.
Time-dependent restricted-active-space self-consistent field theory for laser-driven many-electron dynamics
Creators: name: Miyagi, Haruhide
name: Madsen, Lars Bojer
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences
subject: J.2
subject: 81V45

description: We present the time-dependent restricted-active-space self-consistent field (TD-RASSCF) theory as a new framework for the time-dependent many-electron problem. The theory generalizes the multiconfigurational time-dependent Hartree-Fock (MCTDHF) theory by incorporating the restricted-active-space scheme well known in time-independent quantum chemistry. Optimization of the orbitals as well as the expansion coefficients at each time step makes it possible to construct the wave function accurately while using only a relatively small number of electronic configurations. In numerical calculations of high-order harmonic generation spectra of a one-dimensional model of atomic beryllium interacting with a strong laser pulse, the TD-RASSCF method is reasonably accurate while largely reducing the computational complexity. The TD-RASSCF method has the potential to treat large atoms and molecules beyond the capability of the MCTDHF method.
description: 13 pages, 5 figures
title: Οι αστικοί συντελεστές σε Κέρκυρα και Αργοστόλι και η νοηματοδότηση των επεμβάσεων κατά την περίοδο της Αγγλοκρατίας
title: The urban factors in Kerkura and Argostoli and the meaning of the interventions during the period of England’s kingdom
Creators: name: Παπαγγελοπουλος Γεωργιος
Publisher: name: Technical University of Crete
Year: 2019

description: Σύμφωνα με τον Aldo Rossi, η πόλη συνιστά ένα αρχιτεκτονικό έργο, ένα σύνολο στοιχείων που συνθέτουν την εικόνα μιας χωροχρονικής κατασκευής, η οποία εξελίσσεται και μεταμορφώνεται παράλληλα με τον πολιτισμό, την κοινωνία και τη φύση. Η πόλη είναι μια  «fabbrica» , δηλαδή ένα οικοδόμημα που αναπτύσσεται στον χρόνο. Η ανάλυση της πόλης υπό το πρίσμα των θεσμών αποτελεί το εννοιολογικό νήμα που συνδέει την κατανομή και την οργάνωση των αστικών χώρων, τις χαράξεις του ιστού αλλά και τον τρόπο με τον οποίο αυτές εξελίσσονται στον χρόνο. Η παρούσα έρευνητική εργασία έχοντας ως κινητήρια δύναμη τις παραπάνω σκέψεις, επιδιώκει  την ιστορική, πολεοδομική και αρχιτεκτονική διερεύνηση δύο χαρακτηριστικών παραδειγμάτων- πόλεων (Κέρκυρας, Αργοστολίου) της επτανησιακής περιοχής, κατά την περίοδο της Αγγλοκρατίας. Σκοπό αποτελεί η ανάδειξη της Επτανησιακής γεωγραφικής ενότητας και των αστικών συντελεστών κάθε περίπτωσης και η αναζήτηση ομοιοτήτων, διαφορών, καθώς και τις αιτίες διαμόρφωσης αυτών. Στη προσπάθεια αυτή χρησιμοποιούνται χάρτες του συνόλου των Επτανήσων και ευρύτερου μέρους της Μεσογείου, των εξεταζόμενων αστικών ανατπύξεων, οι οποίοι βασίζονται σε βιβλιογραφικό και αρχειακό υλικό και έχουν υποστεί επεξεργασία προκειμένου να απεικονιστεί η πολεοδομική εξέλιξη και η δράση διάφορων παραγόντων σε αυτή, όπως και να διευκολυνθεί η διαδικασία της σύγκρισης των οικιστικών αναπτύξεων για την ολοκληρωμένη κατανόηση της δυναμικής της εκάστοτε πόλης.
On the minimal number of translated points in contact lens spaces
Creators: name: Allais, Simon
Publisher: name: arXiv
Year: 2021
Subjects: subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 53D10, 58E05, 57R17

description: In this article, we prove that every contactomorphism of any standard contact lens space of dimension $2n-1$ that is contact-isotopic to identity has at least $2n$ translated points. This sharp lower bound refines a result of Granja-Karshon-Pabiniak-Sandon and answers a conjecture of Sandon positively.
description: 9 pages
Four-wave-cooling to the single phonon level in Kerr optomechanics
Creators: name: Bothner, Daniel
name: Rodrigues, Ines C.
name: Steele, Gary A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The field of cavity optomechanics has achieved groundbreaking photonic control and detection of mechanical oscillators, based on their coupling to linear electromagnetic modes. Lately, however, there is an uprising interest in exploring cavity nonlinearities as a powerful new resource in radiation-pressure interacting systems. Here, we present a flux-mediated optomechanical device combining a nonlinear Josephson-based superconducting quantum interference cavity with a mechanical nanobeam. We demonstrate how the intrinsic Kerr nonlinearity of the microwave circuit can be used for a counter-intuitive blue-detuned sideband-cooling scheme based on multi-tone cavity driving and intracavity four-wave-mixing. Based on the large single-photon coupling rate of the system of up to $g_0 = 2π\cdot 3.6\,$kHz and a high mechanical quality factor $Q_\mathrm{m} \approx 4\cdot 10^{5}$, we achieve an effective four-wave cooperativity of $\mathcal{C}_\mathrm{fw} > 100$ and demonstrate four-wave cooling of the mechanical oscillator close to its quantum groundstate, achieving a final occupancy of $n_\mathrm{m} \sim 1.6$. Our results significantly advance the recently developed platform of flux-mediated optomechanics and demonstrate how cavity Kerr nonlinearities can be utilized for novel control schemes in cavity optomechanics.
Arsenic contamination of Bangladesh aquifers exacerbated by clay layers
Creators: name: Mihajlov, Ivan
name: Mozumder, Rajib Hassan
name: Bostick, Benjamin C.
name: Stute, Martin
name: Mailloux, Brian J.
name: Knappett, Peter
name: Choudhury, Imtiaz
name: Ahmed, Kazi Matin
name: Schlosser, Peter
name: Van Geen, Alexander
Publisher: name: Columbia University
Year: 2020
Subjects: subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Hydrology
subject: Aquifers
subject: Groundwater--Arsenic content
subject: Clay

description: Confining clay layers typically protect groundwater aquifers against downward intrusion of contaminants. In the context of groundwater arsenic in Bangladesh, we challenge this notion here by showing that organic carbon drawn from a clay layer into a low-arsenic pre-Holocene (>12 kyr-old) aquifer promotes the reductive dissolution of iron oxides and the release of arsenic. The finding explains a steady rise in arsenic concentrations in a pre-Holocene aquifer below such a clay layer and the repeated failure of a structurally sound community well. Tritium measurements indicate that groundwater from the affected depth interval (40–50 m) was recharged >60 years ago. Deeper (55–65 m) groundwater in the same pre-Holocene aquifer was recharged only 10–50 years ago but is still low in arsenic. Proximity to a confining clay layer that expels organic carbon as an indirect response to groundwater pumping, rather than directly accelerated recharge, caused arsenic contamination of this pre-Holocene aquifer.
Paul Robeson, Art and Integration
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019
Subjects: Art and race
Race relations
History

description: Paul Robeson mixes art, poetry and history of African/ European/ Asian & Latin American Art to demonstrate the depth of all people's history and experience; explaining that art is globally influenced by other cultures and civilizations. Robeson expounds on his father's philosophy from the pulpit, including prejudice as a disease and lessons in dignity. He discusses faith from children, patience and courage, the collective wisdom of people. He talks about erasing Black history and rejecting the old African model. He describes Black history as the Nile and argues that culture is based on great spiritual moral values
Large Violation of the Wiedemann Franz Law in Heusler, Ferromagnetic, Weyl Semimetal Co$_2$MnAl
Creators: name: Robinson, Robert A.
name: Min, Lujin
name: Lee, Seng Huat
name: Li, Peigang
name: Wang, Yu
name: Li, Jinguo
name: Mao, Zhiqiang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The Wiedemann-Franz (WF) law relates the electronic component of the thermal conductivity to the electrical conductivity in metals through the Lorenz number. The WF law has proven to be remarkably robust, however violations have been observed in many topological materials. In this work, we report thermoelectric measurements conducted on Heusler, ferromagnetic, Weyl semimetal Co$_2$MnAl which shows a drastic, temperature dependent violation of the WF law below 300 K. We then discuss our result in the context of known physical explanations for WF law violation. Both the magnitude and temperature dependence of the violation in Co2MnAl are extreme, indicating that there may be more than one effect contributing to the violation in this system.
description: 8 pages, 5 figures
title: Αστικές επεμβάσεις ως εργαλείο ανάδειξης του ιστορικού αποτυπώματος στο παραλιακό μέτωπο του Ηρακλείου (ανατολικό νεώριο – πλατεία Ξενία)

title: Urban interventions as a tool for highlighting the historical footprint  in the coastal front of Heraklion (Arsenali Nuovi - Xenia square)

Creators: name: Αρακαδακη Ελενη
name: Παπαγγελοπουλος Γεωργιος
Publisher: name: Technical University of Crete
Year: 2018

description: Με την παρούσα διπλωματική εργασία επιχειρείται ένα σύνολο επεμβάσεων στο πιο κεντροβαρικό ιστορικά τμήμα του παραλιακού μετώπου της πόλης του Ηρακλείου (ανατολικό νεώριο – πλατεία Ξενία) με στόχο την αστική ολοκλήρωση των ευρύτερων οικοδομικών τετραγώνων/μετώπων και ταυτόχρονα την προβολή των ιστορικών κτισμάτων κι ευρημάτων. Στην περιοχή συγκεντρώνονται ίχνη-μνημεία διαφορετικών περιόδων (συγκρότημα ενετικών νεωρίων, δεξαμενή Ζάνε & αποθήκης άλατος, αρχαιότητες στο οικόπεδο του προϋπάρχοντος ξενοδοχείου «Μίνως», ανασκαφή οικοπέδου ιδιοκτησίας Καλοκαιρινού, ανασκαφικός χώρος στη θέση «Μπεντενάκι», ιερός ναός Αγ. Πέτρου της Μονής των Δομινικανών, αρχαιολογικός χώρος Καστέλας).
Σημαντικό ρόλο στην επιλογή της θέσης αυτής διαδραμάτισε η προβληματική λειτουργία του συγκεκριμένου τμήματος σήμερα. Τον 20ο  αιώνα με τη βίαιη εφαρμογή της νέας παραλιακής λεωφόρου κατεδαφίστηκε  το  μεγαλύτερο  τμήμα  των  Arsenali Vecchi και  Arsenali Nuovi και καλύφθηκε πλήθος ιστορικών καταλοίπων,  προκαλώντας πλέον αδυναμία στον εντοπισμό και αντίληψη από τον επισκέπτη αλλά ακόμη και τον κάτοικο των συνεχειών των υφισταμένων ή προϋπαρχόντων  ιστορικών δομών. Παράλληλα, συναντάται έντονη κυκλοφοριακή συμφόρηση και ασυνέχεια του δημόσιου χώρου σήμερα (τη κίνησης του πεζού).
Γίνεται λοιπόν προσπάθεια κυκλοφοριακής διευθέτησης και όσον το δυνατόν καλύτερης λειτουργίας του παραλιακού μετώπου, παράλληλα με την ανάδειξη ιστορικών στοιχείων και σύνδεση με τον δημόσιο χώρο του ιστορικού κέντρου. Αρχικά με τη μονοδρόμηση της λεωφόρου Νεάρχου (διατηρώντας τη σημερινή φορά της οδού Μητσοτάκη, δηλ. κίνηση από τα δυτικά στα ανατολικά) και παράλληλα πεζοδρόμηση της λεωφόρου Σοφ. Βενιζέλου (παραλιακό τμήμα που συνδέει τις πλατείες 18 Άγγλων και Ξενία), επιδιώκεται η ήπια κυκλοφορία του αυτοκινήτου εντός του ιστορικού κέντρου, σύμφωνα με τα πρότυπα μιας σύγχρονης ιστορικής πόλης/πρωτεύουσας. Γίνεται διαμόρφωση του δημόσιου χώρου με στόχο την ανάδειξη των μνημείων και ευρημάτων που συναντώνται κατά μήκος της παραλιακής διαδρομής/περιπάτου. Επιπλέον, τοποθετούνται κτίρια και χρήσεις σε σημεία όπου θεωρούνται ικανά ώστε να τροφοδοτήσουν τη νέα κατάσταση που δημιουργείται.
The NANOGrav 12.5-Year Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope
Creators: name: Wahl, Haley M.
name: McLaughlin, Maura
name: Gentile, Peter A.
name: Jones, Megan L.
name: Spiewak, Renée
name: Arzoumanian, Zaven
name: Crowter, Kathryn
name: Demorest, Paul
name: DeCesar, Megan E.
name: Dolch, Timothy
name: Ellis, Justin A.
name: Ferdman, Robert D.
name: Ferrara, Elizabeth C.
name: Fonseca, Emmanuel
name: Garver-Daniels, Nate
name: Jones, Glenn
name: Lam, Michael T.
name: Levin, Lina
name: Lewandowska, Natalia
name: Lorimer, Duncan
name: Lynch, Ryan S.
name: Madison, Dustin R.
name: Ng, Cherry
name: Nice, David J.
name: Pennucci, Timothy T.
name: Ransom, Scott M.
name: Ray, Paul S.
name: Stairs, Ingrid
name: Stovall, Kevin
name: Swiggum, Joseph K.
name: Zhu, Weiwei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this work, we present polarization profiles for 23 millisecond pulsars observed at 820 MHz and 1500 MHz with the Green Bank Telescope as part of the NANOGrav pulsar timing array. We calibrate the data using Mueller matrix solutions calculated from observations of PSRs B1929+10 and J1022+1001. We discuss the polarization profiles, which can be used to constrain pulsar emission geometry, and present both the first published radio polarization profiles for nine pulsars and the discovery of very low intensity average profile components ("microcomponents") in four pulsars. Using the Faraday rotation measures, we measure for each pulsar and use it to calculate the Galactic magnetic field parallel to the line of sight for different lines of sight through the interstellar medium. We fit for linear and sinusoidal trends in time in the dispersion measure and Galactic magnetic field and detect magnetic field variations with a period of one year in some pulsars, but overall find that the variations in these parameters are more consistent with a stochastic origin.
description: 35 pages, 21 figures. Accepted to ApJ
[Gymnasium 105, 1998, H. 5 / Hermes 126, 1998, H. 3 / Historia 47, 1998, H. 3 …]
Creators: name: Mensching, Eckart
Publisher: name: Forum Classicum
Year: 2017

description: -
description: Forum Classicum, Nr. 4 (1998): Forum Classicum
Hamiltonian description of self-consistent wave-particle dynamics in a periodic structure
Creators: name: André, Frédéric
name: Bernardi, Pierre
name: Ryskin, Nikita M.
name: Doveil, Fabrice
name: Elskens, Yves
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Conservation of energy and momentum in the classical theory of radiating electrons has been a challenging problem since its inception. We propose a formulation of classical electrodynamics in Hamiltonian form that satisfies the Maxwell equations and the Lorentz force. The radiated field is represented with eigenfunctions using the Gel'fand $β$-transform. The electron Hamiltonian is the standard one coupling the particles with the propagating fields. The dynamics conserves energy and excludes self-acceleration. A complete Hamiltonian formulation results from adding electrostatic action-at-a-distance coupling between electrons.
description: 5 pages
Probing spin entanglement by gate-voltage-controlled interference of current correlation in quantum spin Hall insulators
Creators: name: Chen, Wei
name: Wang, Z. D.
name: Shen, R.
name: Xing, D. Y.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose an entanglement detector composed of two quantum spin Hall insulators and a side gate deposited on one of the edge channels. For an ac gate voltage, the differential noise contributed from the entangled electron pairs exhibits the nontrivial step structures, from which the spin entanglement concurrence can be easily obtained. The possible spin dephasing effects in the quantum spin Hall insulators are also included.
description: Physics Letters A in press
Unified Dark Energy and Dark Matter from Dynamical Spacetime Cosmology
Creators: name: Benisty, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A model of unified dark matter and dark energy based on a Dynamical Spacetime Theory (DST) is studied. By introducing a Dynamical Spacetime vector field $χ_μ$, a conservation of an energy momentum tensor $T^{μν}_{(χ)}$ emerges. The action allows for two different potentials, while one represents a dark energy. For constant potentials, the cosmological solution yields a non singular bouncing solutions that rapidly approaches the $Λ$CDM model. The Dynamical Time corresponds to the cosmic time as well. The theory fits with the late time expansion data of the Universe. With higher dimensions a mechanism for inflation and compactification appears, with exponential growth for some dimensions and exponential contraction of the others. By demanding that the Dynamical Spacetime vector field be a gradient of a scalar the DST becomes a theory with diffusive interacting, which asymptotically returns to the $Λ$CDM model as a stable point. These formulations lead to scenarios which address our understanding about the origin of the Universe.
description: PhD Thesis
Japan’s Voluntary Lockdown
Creators: name: Watanabe, Tsutomu
name: Yabu, Tomoyoshi
Publisher: name: Columbia University
Year: 2020
Subjects: Public health
Communication in public health
Medical policy
COVID-19 (Disease)--Social aspects

description: Japan’s government has taken a number of measures, including declaring a state of emergency, to combat the spread COVID-19. We examine the mechanisms through which the government’s policies have led to changes in people’s behavior. Using smartphone location data, we construct a daily prefecture-level stay-at-home measure to identify the following two effects: (1) the effect that citizens refrained from going out in line with the government’s request, and (2) the effect that government announcements reinforced awareness with regard to the seriousness of the pandemic and people voluntarily refrained from going out. Our main findings are as follows. First, the declaration of the state of emergency reduced the number of people leaving their homes by 8.6% through the first channel, which is of the same order of magnitude as the estimate by Goolsbee and Syverson (2020) for lockdowns in the United States. Second, a 1% increase in new infections in a prefecture reduces people’s outings in that prefecture by 0.026%. Third, the government’s requests are responsible for about one quarter of the decrease in outings in Tokyo, while the remaining three quarters are the result of citizens obtaining new information through government announcements and the daily release of the number of infections. Our results suggest that what is necessary to contain the spread of COVID-19 is not strong, legally binding measures but the provision of appropriate information that encourages people to change their behavior.
[Gymnasium Heft 5/1998 / Anregung 44, 1998, Heft 5 / Damals (Heft 10, 1998, 74-79) …]
Creators: name: Rabl, Josef
Publisher: name: Forum Classicum
Year: 2017

description: -
description: Forum Classicum, Nr. 4 (1998): Forum Classicum
Root-finding Approaches for Computing Conformal Prediction Set
Creators: name: Ndiaye, Eugene
name: Takeuchi, Ichiro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: Conformal prediction constructs a confidence set for an unobserved response of a feature vector based on previous identically distributed and exchangeable observations of responses and features. It has a coverage guarantee at any nominal level without additional assumptions on their distribution. Its computation deplorably requires a refitting procedure for all replacement candidates of the target response. In regression settings, this corresponds to an infinite number of model fits. Apart from relatively simple estimators that can be written as pieces of linear function of the response, efficiently computing such sets is difficult, and is still considered as an open problem. We exploit the fact that, \emph{often}, conformal prediction sets are intervals whose boundaries can be efficiently approximated by classical root-finding algorithms. We investigate how this approach can overcome many limitations of formerly used strategies; we discuss its complexity and drawbacks.
description: Published in Machine Learning Journal https://rdcu.be/c0nh9
title: Σχεδιασμός και προσομοίωση της λειτουργίας στο SIMULINK/MATLAB δίπτερης ανεμογεννήτριας ισχύος 40KW/60KW/80KW
Creators: name: Μπάρδης Σταμάτιος
Publisher: name: Technical University of Crete
Year: 2010

description: Μη διαθέσιμο
Epigramma von Marcus Valerius Martialis. Ausgewählt, ins Deutsche gerückt und mit Bildern versehen von Fritz Graßhoff
Creators: name: Postweiler, Gerhard
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Epigramma von Marcus Valerius Martialis. Ausgewählt, ins Deutsche gerückt und mit Bildern versehen von Fritz Graßhoff. Lateinisch/deutsch, 160 Seiten, Büttenbroschur, DM 42,00 (ISBN 3- 87365-315-X).
description: Forum Classicum, Nr. 4 (1998): Forum Classicum
On topological Clifford semigroups embeddable into products of cones over topological groups
Creators: name: Banakh, Taras
name: Pastukhova, Iryna
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 22A15, 22A26

description: In this paper we detect topological Clifford semigroups which are embeddable into Tychonoff products of topological semilattices and cones over topological groups. Also we detect topological Clifford semigroups which embed into compact topological Clifford semigroups.
description: 10 pages
title: Identification of the EGFR signaling pathway using an asympotic observer based on the rise approach (Robust Integral of the Sign Error)
Creators: name: Παναγιωτίδου Αγάπη
name: Χατζηδαμιανού Νικολίνα
Publisher: name: Technical University of Crete
Year: 2010

description: Μη διαθέσιμο
Synthesis and Characterization of Cu(I) and Cu(II) Complexes Formed Through Carbon Disulfide Insertion
Creators: name: Samim Sultana
name: Pradip. K. Gogoi
Publisher: name: Zenodo
Year: 2021
Subjects: Carbon disulphide
Insertion
copper complexes
ligand
coordination compound

description: Two copper complexes [(PPh3)2Cu(S2COC2H5)] (A) and [(C3H4N2)2Cu(S2COC2H5)] (B) have been synthesized by the insertion of CS2 in (PPh3)2CuCl2 and (C3H4N2)2CuCl2, respectively in mixed solvent of dichloromethane and ethanol at room temperature. The complexes have been characterized by FTIR and ESR spectroscopy. Both the complexes have been found to be air-stable and are distorted square planar geometry.
Paul Krassner at the Elgin Theater
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019
Subjects: Politics and culture
Periodical editors
Counterculture

description: Paul Krassner speaks to an audience at a convention about "moments of awakening" during his life; discusses television, "The Realist," various interviews he conducted (including Patty Hearst), prison riots, Henry Kissinger, Jerry Rubin, Charles Manson, and Roman Polanski; answers questions for a crowd, discusses LSD, Charles Manson, Sirhan Sirhan, Patty Hearst, and other conspiracies
HerMES: A Deficit in the Surface Brightness of the Cosmic Infrared Background Due to Galaxy Cluster Gravitational Lensing
Creators: name: Zemcov, M.
name: Blain, A.
name: Cooray, A.
name: Bethermin, M.
name: Bock, J.
name: Clements, D. L.
name: Conley, A.
name: Conversi, L.
name: Dowell, C. D.
name: Farrah, D.
name: Glenn, J.
name: Griffin, M.
name: Halpern, M.
name: Jullo, E.
name: Kneib, J. -P.
name: Marsden, G.
name: Nguyen, H. T.
name: Richard, S. J. Oliver J.
name: Roseboom, I. G.
name: Schulz, B.
name: Scott, Douglas
name: Shupe, D. L.
name: Smith, A. J.
name: Valtchanov, I.
name: Viero, M.
name: Wang, L.
name: Wardlow, J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have observed four massive galaxy clusters with the SPIRE instrument on the Herschel Space Observatory and measure a deficit of surface brightness within their central region after subtracting sources. We simulate the effects of instrumental sensitivity and resolution, the source population, and the lensing effect of the clusters to estimate the shape and amplitude of the deficit. The amplitude of the central deficit is a strong function of the surface density and flux distribution of the background sources. We find that for the current best fitting faint end number counts, and excellent lensing models, the most likely amplitude of the central deficit is the full intensity of the cosmic infrared background (CIB). Our measurement leads to a lower limit to the integrated total intensity of the CIB of I(250 microns) > 0.69_(-0.03)^(+0.03) (stat.)_(-0.06)^(+0.11) (sys.) MJy/sr, with more CIB possible from both low-redshift sources and from sources within the target clusters. It should be possible to observe this effect in existing high angular resolution data at other wavelengths where the CIB is bright, which would allow tests of models of the faint source component of the CIB.
description: 5 pages, 3 figures, replacing with version matching published manuscript
Harnessing vacuum forces for quantum sensing of graphene motion
Creators: name: Muschik, Christine A.
name: Moulieras, Simon
name: Bachtold, Adrian
name: Lewenstein, Maciej
name: Koppens, Frank
name: Chang, Darrick
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Position measurements at the quantum level are vital for many applications, but also challenging. Typically, methods based on optical phase shifts are used, but these methods are often weak and difficult to apply to many materials. An important example is graphene, which is an excellent mechanical resonator due to its small mass and an outstanding platform for nanotechnologies, but is largely transparent. Here, we present a novel detection scheme based upon the strong, dispersive vacuum interactions between a graphene sheet and a quantum emitter. In particular, the mechanical displacement causes strong changes in the vacuum-induced shifts of the transition frequency of the emitter, which can be read out via optical fields. We show that this enables strong quantum squeezing of the graphene position on time scales short compared to the mechanical period.
description: To appear in Physical Review Letters
Deep Learning for Bayesian Optimization of Scientific Problems with High-Dimensional Structure
Creators: name: Kim, Samuel
name: Lu, Peter Y.
name: Loh, Charlotte
name: Smith, Jamie
name: Snoek, Jasper
name: Soljačić, Marin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Applied Physics (physics.app-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: Optics (physics.optics)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Bayesian optimization (BO) is a popular paradigm for global optimization of expensive black-box functions, but there are many domains where the function is not completely a black-box. The data may have some known structure (e.g. symmetries) and/or the data generation process may be a composite process that yields useful intermediate or auxiliary information in addition to the value of the optimization objective. However, surrogate models traditionally employed in BO, such as Gaussian Processes (GPs), scale poorly with dataset size and do not easily accommodate known structure. Instead, we use Bayesian neural networks, a class of scalable and flexible surrogate models with inductive biases, to extend BO to complex, structured problems with high dimensionality. We demonstrate BO on a number of realistic problems in physics and chemistry, including topology optimization of photonic crystal materials using convolutional neural networks, and chemical property optimization of molecules using graph neural networks. On these complex tasks, we show that neural networks often outperform GPs as surrogate models for BO in terms of both sampling efficiency and computational cost.
description: 32 pages, 16 figures; published in TMLR
Checking the optimality of entanglement witnesses: an application to structural physical approximations
Creators: name: Augusiak, R.
name: Bae, J.
name: Tura, J.
name: Lewenstein, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In 2008, the conjecture that structural physical approximations to optimal entanglement witnesses are separable states (in general unnormalized) was posed. In an attempt to disprove it, in [K.-C. Ha and S.-H. Kye, Separable states with unique decompositions, arXiv:1210.1088v3], Ha and Kye proposed a decomposable entanglement witness whose SPA is entangled and argued that it is optimal. In this note, which is based on a comment to the latter work [R. Augusiak et al., Comment on "Separable states with unique decompositions", arXiv:1304.2040v1], we show, both analytically and numerically, that this entanglement witness is not optimal, and as such it is not a counterexample to the conjecture. To this end, we make use of a method for checking optimality of entanglement witnesses developed already in [M. Lewenstein et al., Phys. Rev. A 62, 052310 (2000)], however, hardly exploited so far in the literature.
description: 10 pages, one figure, paper based on the comment arXiv:1304.2040v1
Spatial-Spectral Clustering with Anchor Graph for Hyperspectral Image
Creators: name: Wang, Qi
name: Miao, Yanling
name: Chen, Mulin
name: Li, Xuelong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Hyperspectral image (HSI) clustering, which aims at dividing hyperspectral pixels into clusters, has drawn significant attention in practical applications. Recently, many graph-based clustering methods, which construct an adjacent graph to model the data relationship, have shown dominant performance. However, the high dimensionality of HSI data makes it hard to construct the pairwise adjacent graph. Besides, abundant spatial structures are often overlooked during the clustering procedure. In order to better handle the high dimensionality problem and preserve the spatial structures, this paper proposes a novel unsupervised approach called spatial-spectral clustering with anchor graph (SSCAG) for HSI data clustering. The SSCAG has the following contributions: 1) the anchor graph-based strategy is used to construct a tractable large graph for HSI data, which effectively exploits all data points and reduces the computational complexity; 2) a new similarity metric is presented to embed the spatial-spectral information into the combined adjacent graph, which can mine the intrinsic property structure of HSI data; 3) an effective neighbors assignment strategy is adopted in the optimization, which performs the singular value decomposition (SVD) on the adjacent graph to get solutions efficiently. Extensive experiments on three public HSI datasets show that the proposed SSCAG is competitive against the state-of-the-art approaches.
Nucleon form factors and moments of generalized parton distributions using $N_f=2+1+1$ twisted mass fermions
Creators: name: Alexandrou, C.
name: Constantinou, M.
name: Dinter, S.
name: Drach, V.
name: Jansen, K.
name: Kallidonis, C.
name: Koutsou, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present results on the axial and the electromagnetic form factors of the nucleon, as well as, on the first moments of the nucleon generalized parton distributions using maximally twisted mass fermions. We analyze two N_f=2+1+1 ensembles having pion masses of 210 MeV and 354 MeV at two values of the lattice spacing. The lattice scale is determined using the nucleon mass computed on a total of 18 N_f=2+1+1 ensembles generated at three values of the lattice spacing, $a$. The renormalization constants are evaluated non-perturbatively with a perturbative subtraction of ${\cal O}(a^2)$-terms. The moments of the generalized parton distributions are given in the $\bar{\rm MS}$ scheme at a scale of $ μ=2$ GeV. We compare with recent results obtained using different discretization schemes. The implications on the spin content of the nucleon are also discussed.
description: Version accepted for publication in Phys. Rev. D. 23 pages, 27 figures
Insight-HXMT Measurements of the Diffuse X-ray Background
Creators: name: Huang, Rui
name: Cui, Wei
name: Liao, Jin-Yuan
name: Zhang, Shuo
name: Wang, Si-Fan
name: Jin, Jing
name: Lu, Xue Feng
name: Guo, Cheng-Cheng
name: You, Yuan
name: Li, Gang
name: Zhang, Juan
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present an X-ray spectrum of the diffuse X-ray background (DXRB) between 1.5 and 120 keV, as measured with the Low-Energy Detector (LE) and the High-Energy Detector (HE) aboard the Insight-HXMT satellite, based on 'blank-sky' observations. LE covers a nominal energy range of 1-15 keV and HE 20-250 keV, but calibration issues and data quality narrowed the energy range for this work. The LE background was directly measured with `blind' detector modules, while the HE background was derived from Earth-occultation data. With the LE data alone, the measured DXRB spectrum can be well described by a power law; fitting the LE and HE data jointly, however, a spectral cut-off must be introduced in the model to account for the measurements above 30 keV. Modelling the combined spectrum with a cut-off power law, the best-fit photon index is 1.40, normalisation $9.57$~$\rm ph~cm^{-2}~s^{-1}~keV^{-1}~sr^{-1} $ (at 1 keV), and cut-off energy 55 keV, after correcting for the effects of the Earth albedo and atmospheric emission (which are significant in the HE band). Based on the best-fit cut-off power law, we derived the spectral energy distribution (SED) of the DXRB. The shape of the SED is in general agreement with the published measurements, but the overall normalization is lower by varying amounts, except for the HEAO-1 result, with which our result is in good agreement.
description: 9 pages, 14 figures, published in MNRAS
Homogeneous spaces of Hilbert type
Creators: name: Borovoi, Mikhail
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: Primary: 14M17, 12E25, Secondary: 20G30, 12E30

description: Let k be a global field. Let G be a connected linear algebraic k-group, assumed reductive when k is a function field. It follows from a result of a preprint by Bary-Soroker, Fehm and Petersen that when H is a smooth connected k-subgroup of G, the quotient space G/H is of Hilbert type. We prove a similar result for certain non-connected k-subgroups H of G. In particular, we prove that if G is a simply connected k-group over a number field k, and H is an abelian k-subgroup of G, not necessarily connected, then G/H is of Hilbert type.
description: 7 pages, final version, to appear in the International Journal of Number Theory
Field Trimming of Lettuce: Effects on Package Weight and Market Quality
Creators: name: Harvey, J. M.
name: Stewart, J. K.
name: Atrops, E. A.
name: Ceponis, M. J.
name: Chapogas, P. G.
name: Harvey, J. M.
name: Stewart, J. K.
name: Atrops, E. A.
name: Ceponis, M. J.
name: Chapogas, P. G.
Publisher: name: Unknown
Year: 1961
Subjects: subject: Crop Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Research and Development/Tech Change/Emerging Technologies

description: Excerpts from the report: The weight of lettuce packed in cartons has increased progressively, largely due to pressure from wholesale buyers and the subsequent selling of lettuce on a weight basis at retail. Aside from the obvious effect of this practice on gross weights of lettuce packages, the effect on quality should be considered. Placing excessive amounts of lettuce in a carton would appear to be a primary cause of bruising and crushing of the heads. A reduction of package weights might be accomplished by trimming the heads in the field to reduce the number of wrapper leaves remaining in the pack. Five to six wrapper leaves are commonly left on the heads. It has been suggested that decay may be reduced by trimmming, as outer wrapper leaves are contaminated with decay-causing organisms. The fact that they are older chronologically and physiologically makes the wrapper leaves more susceptible to decay than the younger leaves toward the center of the head. At the request of industry representatives, tests were conducted to relate various degrees of trimming of the heads to package weight, bruising, decay, and other quality factors.
TAO pairing: a fully gapped pairing scenario for the Iron-Based Superconductors
Creators: name: Ong, T. Tzen
name: Coleman, Piers
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Motivated by the fully gapped superconductivity in iron-based superconductors with uncompensated electron pockets, we propose a spin singlet, but orbital triplet analogue of the superfluid phase of He-3B. We show that orbital triplets with a nominal d-wave symmetry at the iron sites can transform as s-wave pairs under rotations about the selenium sites. Linear combinations of such d$_{xy}$ and d$_{x^{2}-y^{2}}$ triplets form a fully gapped, topological superconductor. Raman-active excitations are predicted to develop below the superconducting transition temperature.
description: Two column version, with significant revision