cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Model robustness of finite state nonlinear filtering over the infinite time horizon
Creators: name: Chigansky, Pavel
name: van Handel, Ramon
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 93E11 (Primary) 93E15, 60H07, 60J27 (Secondary)

description: We investigate the robustness of nonlinear filtering for continuous time finite state Markov chains, observed in white noise, with respect to misspecification of the model parameters. It is shown that the distance between the optimal filter and that with incorrect model parameters converges to zero uniformly over the infinite time interval as the misspecified model converges to the true model, provided the signal obeys a mixing condition. The filtering error is controlled through the exponential decay of the derivative of the nonlinear filter with respect to its initial condition. We allow simultaneously for misspecification of the initial condition, of the transition rates of the signal, and of the observation function. The first two cases are treated by relatively elementary means, while the latter case requires the use of Skorokhod integrals and tools of anticipative stochastic calculus.
description: Published at http://dx.doi.org/10.1214/105051606000000871 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Determination of the Collins-Soper Kernel from Lattice QCD
Creators: name: Schlemmer, Maximilian
name: Vladimirov, Alexey
name: Zimmermann, Christian
name: Engelhardt, Michael
name: Schäfer, Andreas
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present lattice results for the non-perturbative Collins-Soper (CS) kernel, which describes the energy-dependence of transverse momentum-dependent parton distributions (TMDs). The CS kernel is extracted from the ratios of first Mellin moments of quasi-TMDs evaluated at different nucleon momenta.The analysis is done with dynamical $N_f=2+1$ clover fermions for the CLS ensemble H101 ($a=0.0854\,\mathrm{fm}$, $m_π=m_K=422\,\mathrm{MeV}$). The computed CS kernel is in good agreement with experimental extractions and previous lattice studies.
The Post-Burst Awakening of the Anomalous X-ray Pulsar in Westerlund 1
Creators: name: Israel, G. L.
name: Campana, S.
name: Dall'Osso, S.
name: Muno, M. P.
name: Cummings, J.
name: Perna, R.
name: Stella, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: On September 21, 2006, an intense (~10^39 erg/s) and short (20 ms) burst was detected by Swift BAT at a position consistent with that of the candidate Anomalous X-ray Pulsar, CXOU J164710.2-455216, discovered by Chandra in 2005. Swift follow-up observations began about 13 hours after the event and found the source at a 1-10keV flux level of about 4.5 x 10^-11 erg/s/cm^2, i.e. ~300 times brighter than measured 5 days earlier by XMM. We report the results obtained from Swift BAT observations of the burst and subsequent Swift XRT observations carried out during the first four months after the burst. These data are complemented with those from two XMM observations (carried out just before and after the BAT event) and four archival Chandra observations carried out between 2005 and 2007. We find a phase coherent solution for the source pulsations after the burst. The evolution of the pulse phase comprises an exponential component decaying with timescale of 1.4d which we interpret as the recovery stage following a large glitch (Delta nu / nu about 6 x 10^-5). We also detect a quadratic component corresponding to a spin-down rate of Pdot ~ 9 x 10^-13, implying a magnetic field strength of 10^14 Gauss. During the first Swift XRT observation taken 0.6 days after the burst, the spectrum showed a kT = 0.65keV blackbody (R_BB = 1.5km) plus a Gamma=2.3 power-law accounting for about 60% of the 1-10 keV observed flux. Analysis of Chandra archival data, taken during 2005 when the source was in quiescence, reveal that the modulation in quiescence is 100% pulsed at energies above 4 keV and consistent with the (unusually small-sized) blackbody component being occulted by the neutron star as it rotates.
description: Accepted for publication on ApJ Main Journal; 24 pages, 8 figures
A study of Franz Liszt’s Hungarian rhapsodies
Creators: name: Francey, Dana Charlene
Publisher: name: University of British Columbia
Year: 2018

description: Hungarian Rhapsodies which will lead to a better understanding of Liszt’s stylistic development in relation to this unique genre of his own creation. The works will be approached and classified according to three main topics: explore the circumstances under which Liszt compo earlier Magyar pieces to the Hungarian Rhapsodies will be illustrated, showing Liszt’s revision of the formal structure when transferring selected A second categorization will then be made, based on the evolution of compositional style in the Hungarian Rhapsodies, exemplified by the improvisatory, virtuosic writing in Hungarian Rhapsody Nos. 1—15 as compared of this compositional technique will be illustrated through the analysis of several of his paraphrase pieces. Analyses of Liszt’s use of the paraphrase technique in the Hungarian Rhapsodies and parallel Macwar Dallok or Macwar Rhapszodiák pieces will show that, in fact, both sets contain similar techniques of paraphrase, and thus, the relationship between the two sets can be seen as one being a variant of the other. These analyses will also demonstrate a similarilty between the Hungarian Rhapsodies and Liszt’s other paraphrases regarding the degree to which the paraphrase technique is applied, ranging from subtle to extensive. In chapter four conclusions will be drawn concerning the aesthetic value of the Hungarian Rhapsodies. It is common is music criticism to infer that because the Hungarian Rhapsodies do not present the conflictual, developmental working out of themes specific to other nineteenth—century genres, but, instead, are comprised of simple tunes repeated with increasing elaboration in a virtuosic style, they therefore are works of lesser value. In this final chapter I will suggest reasoning to the contrary in an attempt to give Liszt’s Hungarian Rhapsodies the esteemed recognition they deserved the Hungarian Rhapsodies, and consider his possible motivations, including direct and indirect influences which may have played an important role in the creation and development of his ideas. Letters and other testimonies will also help to answer questions such as: where, when and for whom were these works composed (as revealed by the dedications); and where, when and for whom were these works performed during Liszt’s life. The second chapter of the thesis will describe the relationship of the Hungarian Rhapsodies with the original collections of Hungarian folk tunes on which they are based (Macwar Dallok and Macwar Rhapszodiák pieces), and subsequently will use the relationship with this pre-existing material as the foundation for grouping them into categories, e.g., Hungarian Rhapsody Nos. 1-2 (based on folk tunes not found in the Magyar collection); Hungarian Rhapsody Nos. 3-15 (based on folk tunes found in the Magyar collection); Hungarian Rhapsody Nos. 16-18 (not based on any pre—existing material —- all original works); and Hungarian Rhapsody No. 19 (based entirely on Csárdás nobles by Abrányi, an Hungarian composer). An evolution of form from the
Minimal conditions for survival of technological civilizations in the face of stellar evolution
Creators: name: Hansen, Brad
name: Zuckerman, Ben
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: The ease of interstellar rocket travel is an issue with implications for the long term fate of our own and other civilizations and for the much-debated number of technological civilizations in the Galaxy. We show that the physical barrier to interstellar travel can be greatly reduced if voyagers are patient, and wait for the close passage of another star. For a representative time of $\sim$1 Gyr, characteristic of the remaining time that Earth will remain habitable, one anticipates a passage of another star within $\sim 1500$~AU. This lowers the travel time for interstellar migration by $\sim$ two orders of magnitude compared with calculated travel times based on distances comparable to average interstellar separations (i.e., $\sim$1 pc) in the solar vicinity. We consider the implications for how long-lived civilizations may respond to stellar evolution, including the case of stars in wide binaries, and the difficulties of identifying systems currently undergoing a relevant close encounter. Assuming that life originates only around G-type stars, but migrates primarily to lower mass hosts when the original system becomes uninhabitable, the fraction of extant technological civilizations that exist as diaspora can be comparable to the fraction that still orbit their original host stars.
description: 9 pages, 0 figures, to appear in the Astronomical Journal
Sentence Comprehension Ability in Greek-speaking Individuals with Agrammatic Broca's Aphasia
Creators: name: Κλάδος, Εμμανουήλ Χαρίτωνος
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: κατανόηση προτάσεων
γλωσσική διαταραχή αγραμματισμού (αφασία τύπου Μπροκά)
ελληνόφωνοι ασθενείς
sentence comprehension
agrammatic Broca's aphasia
Greek-speaking individuals

description: Η έρευνα αφορά την επίδραση της γλωσσικής διαταραχής του αγραμματισμού (αφασία τύπου Μπροκά) στην κατανόηση προτάσεων. Σκοπός της έρευνας ήταν να εξετάσουμε αν η σειρά των λέξεων, η μορφολογική πτώση, η ονοματική και η ρηματική συμφωνία, και η θέση του επιθέτου επηρεάζουν την επίδοση των ασθενών με γλωσσική διαταραχή του αγραμματισμού στην κατανόηση προτάσεων. Χρησιμοποιήσαμε δύο τεστ κρίσης γραμματικότητας για να αξιολογήσουμε την επίδοση των συμμετεχόντων στις σειρές ρήμα-υποκείμενο-αντικείμενο και ρήμα-αντικείμενο-υποκείμενο, στις σειρές υποκείμενο-ρήμα και ρήμα-υποκείμενο, στις δομές με ορίσματα στην ονομαστική και στην αιτιατική, σε επίθετα πριν και μετά το ουσιαστικό, στην ονοματική και στη ρηματική συμφωνία, οι οποίες περιλαμβάνουν συμφωνία αριθμού, γένους και προσώπου. Τα αποτελέσματα δείχνουν ότι οι ασθενείς αντιμετώπισαν δυσκολία στην ερμηνεία υποκειμένων που ακολουθούν το ρήμα και ότι στην ερμηνεία που έδιναν στις προτάσεις ο δράστης προηγούνταν του θέματος. Επιπλέον, οι ασθενείς παρουσίασαν έλειμμα στην κατανόηση της ονοματικής, και κυρίως, της ρηματικής συμφωνία, ενώ δε βρέθηκαν διαφορές μεταξύ των συμφωνιών αριθμού, γένους και προσώπου. Τα αποτελέσματα είναι ασαφή σχετικά με τα επίθετα που προηγούνται ή έπονται του ρήματος και σχετικά με το ρόλο της μορφολογικής πτώσης. Η επίδοση των ασθενών φαίνεται να εξηγείται από ένα έλειμμα επεξεργασίας, σε συνδυασμό με μία επιλεκτική βλάβη στο νοητικό λεξικό
description: This study concerns the effect of agrammatic Broca's aphasia on sentence comprehension. The aim of the study was to examine whether word order, morphological case, domain of agreement and its subparts, and adjective position affect the performance of agrammatic patients in sentence comprehension. Two grammaticallity judgment tasks were used to assess the performance of individuals on VSO vs VOS order, SV vs VS order, nom-nom vs acc-acc structures, prenominal vs postnominal adjectives, nominal vs verbal domain of agreement, and their subparts, which include number, gender, and person agreement. Results show a general difficulty of patients in interpreting postverbal subjects, a preferred agent – theme interpretation of the sentence, a less impaired nominal domain of agreement, a more impaired verbal one, and no differences between their subparts. Unclear results are reported for prenominal vs postnominal adjectives and for the role of morphological case. A processing deficit, along with a selective impairment in the mental lexicon seem to explain the performance of agrammatic patients
Study of exclusive semileptonic and nonleptonic decays of $B_c^-$ in a nonrelativistic quark model
Creators: name: Hernandez, E.
name: Nieves, J.
name: Verde-Velasco, J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present results for different observables measured in semileptonic and non-leptonic decays of the $B_c^-$ meson. The calculations have been done within the framework of a nonrelativistic constituent quark model. In order to check the sensitivity of all our results against the inter-quark interaction we use five different quark--quark potentials. We obtain form factors, decay widths and asymmetry parameters for semileptonic $B_c^-\to c\bar c$ and $B_c^-\to \bar B$ decays. In the limit of infinite heavy quark mass our model reproduces the constraints of heavy quark spin symmetry. For the actual heavy quark masses we find nonetheless large corrections to that limiting situation for some form factors. We also analyze exclusive non-leptonic two--meson decay channels within the factorization approximation.
description: 41 latex pages, 14 figures, 21 tables.Version accepted for publication in Phys. Rev. D
Full Stabilization of a Microresonator based Optical Frequency Comb
Creators: name: Del'Haye, P.
name: Arcizet, O.
name: Schliesser, A.
name: Holzwarth, R.
name: Kippenberg, T. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate control and stabilization of an optical frequency comb generated by four-wave mixing in a monolithic microresonator with a mode spacing in the microwave regime (86 GHz). The comb parameters (mode spacing and offset frequency) are controlled via the power and the frequency of the pump laser, which constitutes one of the comb modes. Furthermore, generation of a microwave beat note at the comb's mode spacing frequency is presented, enabling direct stabilization to a microwave frequency standard.
Anomaly detection and automatic labeling for solar cell quality inspection based on Generative Adversarial Network
Creators: name: Balzategui, Julen
name: Eciolaza, Luka
name: Maestro-Watson, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: I.4.9; I.2.1

description: Quality inspection applications in industry are required to move towards a zero-defect manufacturing scenario, withnon-destructive inspection and traceability of 100 % of produced parts. Developing robust fault detection and classification modelsfrom the start-up of the lines is challenging due to the difficulty in getting enough representative samples of the faulty patternsand the need to manually label them. This work presents a methodology to develop a robust inspection system, targeting thesepeculiarities, in the context of solar cell manufacturing. The methodology is divided into two phases: In the first phase, an anomalydetection model based on a Generative Adversarial Network (GAN) is employed. This model enables the detection and localizationof anomalous patterns within the solar cells from the beginning, using only non-defective samples for training and without anymanual labeling involved. In a second stage, as defective samples arise, the detected anomalies will be used as automaticallygenerated annotations for the supervised training of a Fully Convolutional Network that is capable of detecting multiple types offaults. The experimental results using 1873 EL images of monocrystalline cells show that (a) the anomaly detection scheme can beused to start detecting features with very little available data, (b) the anomaly detection may serve as automatic labeling in order totrain a supervised model, and (c) segmentation and classification results of supervised models trained with automatic labels arecomparable to the ones obtained from the models trained with manual labels.
description: 20 pages, 10 figures, 6 tables. This article is part of the special issue "Condition Monitoring, Field Inspection and Fault Diagnostic Methods for Photovoltaic Systems" Published in MDPI - Sensors: see https://www.mdpi.com/journal/sensors/special_issues/Condition_Monitoring_Field_Inspection_and_Fault_Diagnostic_Methods_for_Photovoltaic_Systems
*Who, what, when, where, why, how, and *?
Creators: name: Steele, Susan
name: Oswalt Family
name: Oswalt, Robert L.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: peb
subject: poo
subject: kju
subject: pom
subject: peq
subject: pej
subject: pef

description: Photocopy of Steele's typed manuscript, with Oswalt's hand annotations.
Narrative as an assessment tool for Greek-speaking children with specific language impairment and high functioning autism
Creators: name: Γκέγκα, Κορνηλία Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Ειδική γλωσσική διαταραχή
Αυτισμός υψηλής λειτουργικότητας
Αναδιήγηση
Specific language impairment
High functioning autism
Story retelling

description: Αντικείμενο της παρούσας εργασίας είναι η εξερεύνηση του πεδίου της μη παρεμβατικής παρακολουθησης ηλεκτρικού φόρτου σε σπίτια με χρήση τεχνικών μηχανικής μάθησης. Στην εργασία αναλύονται οι κυριότερες των τεχνικών που έχουν αναπτυχθεί για το πρόβλημα αυτό. Καθώς επίσης, αναπτύσσεται και υλοποιείται μία νέα τεχνική που βασίζεται στις αρχές της μεταφοράς χαρακτηριστικών σε άλλη διάσταση και τύπο. Δηλαδή μετατρέπεται το ηλεκτρικό σήμα σε μορφή εικόνων και στη συνέχεια σε μορφή χαρακτηριστικών με χρήση Τεχνητού Νευρωνικού Δικτύου και εξετάζεται πόσο επιτυχής είναι αυτή η μέθοδος σε σύγκριση με προηγούμενες υλοποιημένες μεθόδους της βιβλιογραφίας. Η μέθοδος που προτείνεται στην παρούσα εργασία λειτουργεί καλύτερα για ορισμένες συσκευές σε σχέση με τα συγκρινόμενα μοντέλα
description: Goal of this thesis is to explore the field of Non Intrusive Load Monitoring in houses with the application of machine learning techniques. The main existing techniques and models, that have been applied to the NILM problem, are analysed. Furthermore, a new technique based on transfer learning is developed and described. This technique is based on transferring the input data first at image representation and then to a different input space using a pretrained Artificial Neural Network. The proposed method is then directly compared to previously existing methods. It is found out that the proposed method outperforms the methods that it is compared to for some appliances
The trap of complacency in predicting the maximum
Creators: name: Toit, J. du
name: Peskir, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G40, 35R35, 62M20 (Primary) 60J65, 45G15, 60J60 (Secondary)

description: Given a standard Brownian motion $B^μ=(B_t^μ)_{0\le t\le T}$ with drift $μ\in \mathbb{R}$ and letting $S_t^μ=\max_{0\le s\le t}B_s^μ$ for $0\le t\le T$, we consider the optimal prediction problem: \[V=\inf_{0\le τ\le T}\mathsf{E}(B_τ^μ-S_T^μ)^2\] where the infimum is taken over all stopping times $τ$ of $B^μ$. Reducing the optimal prediction problem to a parabolic free-boundary problem we show that the following stopping time is optimal: \[τ_*=\inf \{t_*\le t\le T\mid b_1(t)\le S_t^μ-B_t^μ\le b_2(t)\}\] where $t_*\in [0,T)$ and the functions $t\mapsto b_1(t)$ and $t\mapsto b_2(t)$ are continuous on $[t_*,T]$ with $b_1(T)=0$ and $b_2(T)=1/2μ$. If $μ>0$, then $b_1$ is decreasing and $b_2$ is increasing on $[t_*,T]$ with $b_1(t_*)=b_2(t_*)$ when $t_*\ne 0$. Using local time-space calculus we derive a coupled system of nonlinear Volterra integral equations of the second kind and show that the pair of optimal boundaries $b_1$ and $b_2$ can be characterized as the unique solution to this system. This also leads to an explicit formula for $V$ in terms of $b_1$ and $b_2$. If $μ\le 0$, then $t_*=0$ and $b_2\equiv +\infty$ so that $τ_*$ is expressed in terms of $b_1$ only. In this case $b_1$ is decreasing on $[z_*,T]$ and increasing on $[0,z_*)$ for some $z_*\in [0,T)$ with $z_*=0$ if $μ=0$, and the system of two Volterra equations reduces to one Volterra equation. If $μ=0$, then there is a closed form expression for $b_1$. This problem was solved in [Theory Probab. Appl. 45 (2001) 125--136] using the method of time change (i.e., change of variables). The method of time change cannot be extended to the case when $μ\ne 0$ and the present paper settles the remaining cases using a different approach.
description: Published at http://dx.doi.org/10.1214/009117906000000638 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Institutionalising Ethics in AI through Broader Impact Requirements
Creators: name: Prunkl, Carina
name: Ashurst, Carolyn
name: Anderljung, Markus
name: Webb, Helena
name: Leike, Jan
name: Dafoe, Allan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Turning principles into practice is one of the most pressing challenges of artificial intelligence (AI) governance. In this article, we reflect on a novel governance initiative by one of the world's largest AI conferences. In 2020, the Conference on Neural Information Processing Systems (NeurIPS) introduced a requirement for submitting authors to include a statement on the broader societal impacts of their research. Drawing insights from similar governance initiatives, including institutional review boards (IRBs) and impact requirements for funding applications, we investigate the risks, challenges and potential benefits of such an initiative. Among the challenges, we list a lack of recognised best practice and procedural transparency, researcher opportunity costs, institutional and social pressures, cognitive biases, and the inherently difficult nature of the task. The potential benefits, on the other hand, include improved anticipation and identification of impacts, better communication with policy and governance experts, and a general strengthening of the norms around responsible research. To maximise the chance of success, we recommend measures to increase transparency, improve guidance, create incentives to engage earnestly with the process, and facilitate public deliberation on the requirement's merits and future. Perhaps the most important contribution from this analysis are the insights we can gain regarding effective community-based governance and the role and responsibility of the AI research community more broadly.
Isolation and characterization of retinoic acid-induced revertants of bovine papillomavirus 1 DNA-transformed mouse G127 cells
Creators: name: Li, Gang
Publisher: name: University of British Columbia
Year: 2008

description: The action of all-trans-retinoic acid (PA), which is currently being tested as a chemopreventive and chemotherapeutic agent, was studied on bovine papillomavirus (BPV)-l DNA mediated transformation of mouse Cl27 cells. BPV-1 DNA-transformed cell lines B3 and BF3 were exposed to 5 pM of PA for 10 weeks. The copy number of BPV DNA in the transformed cells gradually decreased by PA treatment. After 10-week PA treatment, the cells were void of viral DNA, no longer exhibited a transformed morphology and lost the ability to form multilayered foci. These PA treated B3 and BF3 cells are PA-induced revertants and designated as B3RA1O and BF3RA1O. The revertant cells were resistant to retransforruation by BPV DNA. The transformation efficiency of the revertant cells is at least 7- to 13-fold less than that of C127 cells. The revertant cells were not resistant to transformation induced by a human Ha-ras gene. These two revertant cell lines have similar population doubling time and saturation density as C127 cells. Using cDNA cloning and differential hybridization technique, a eDNA sequence that is expressed differently in BF3 transformed cells and BF3PA1O revertants was cloned. DNA sequencing revealed that the cloned gene is the ND5 gene of mitochondria. In the transformed cells, the level of ND5 mNRA was dependent on the density of the cells. ND5 expression was 5- to 7- fold higher at 8% cell confluency than at 80% confluency. In the revertant cells, the amount of ND5 mRNA was independent of cell density. In Cl27 cells, the pattern of ND5 expression was similar to that in the revertant cells at subconfluency. However, after the cells reached confluency, ND5 gene was expressed the same as in transformed EF3 cells. PA increased the amount of ND5 mRNA in untransformed C127, transformed BF3, and revertant BF3RA1O cells by 8- to 10-fold at subconfluency. After the cells reached confluency, PA only induced a 2- to 3-fold increase in the level of ND5 mRNA. The results demonstrated that the reversion of the transformed phenotype of the transformed cells by PA treatment is associated with the elimination of BPV DNA and changes of cellular gene expression pattern. The different patterns of ND5 expression in transformed cells and PA-induced revertants suggest mitochondrial genes may play a role in cell transformation.
Neutron Star Asteroseismology. Axial Crust Oscillations in the Cowling Approximation
Creators: name: Samuelsson, Lars
name: Andersson, Nils
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent observations of quasi-periodic oscillations in the aftermath of giant flares in soft gamma-ray repeaters suggest a close coupling between the seismic motion of the crust after a major quake and the modes of oscillations in a magnetar. In this paper we consider the purely elastic modes of oscillation in the crust of a neutron star in the relativistic Cowling approximation (disregarding any magnetic field). We determine the axial crust modes for a large set of stellar models, using a state-of-the-art crust equation of state and a wide range of core masses and radii. We also devise useful approximate formulae for the mode-frequencies. We show that the relative crust thickness is well described by a function of the compactness of the star and a parameter describing the compressibility of the crust only. Considering the observational data for SGR 1900+14 and SGR 1806-20, we demonstrate how our results can be used to constrain the mass and radius of an oscillating neutron star.
description: 14 pages, 1 table, 4 figures. v2: Typos corrected, references added and a bug in the code was fixed which slightly modifies the figures but leaves the conclusions unchanged
General condition of quantum teleportation by one-dimensional quantum walks
Creators: name: Yamagami, Tomoki
name: Segawa, Etsuo
name: Konno, Norio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We extend the scheme of quantum teleportation by quantum walks introduced by Wang et al. (2017). First, we introduce the mathematical definition of the accomplishment of quantum teleportation by this extended scheme. Secondly, we show a useful necessary and sufficient condition that the quantum teleportation is accomplished rigorously. Our result classifies the parameters of the setting for the accomplishment of the quantum teleportation.
description: 22 pages, 1 figure
Magnetic collective mode in underdoped cuprates: a phenomenological analysis
Creators: name: Prelovsek, P.
name: Sega, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The dynamical spin susceptibility as relevant for underdoped cuprates is analysed within the memory-function (MeF) approach. A phenomenological damping function combined with a $T$-independent sum rule is used to describe the anomalous normal state and the resonant peak in the superconducting state, in particular its position and its relative intensity to the normal state. The relation with the random-phase approximation is discussed. The MeF method is generalized to the bilayer system in order to compare with inelastic neutron scattering experiments on YBa$_2$Cu$_3$O$_{6+x}$ which alows also for a quantitative comparison. In this context the problem of missing integrated spectral intensity within the experimentally accessible energy window is also discussed.
description: 6 pages (RevTex), 4 Postscript figures(*.eps), 2 Tables included in the text. Original paper (v1) expanded into an article with (sub)sections; first part of content unchanged. Added Fig.4, Table II, section on comparison with experiments and two references. Corrected typo in Table I (2nd row, last entry)
A preliminary statement of the consonant and vowel correspondences among the Pomo languages
Creators: name: Tanous, Louise
name: Wall, Carolyn F.
name: Webb, Nancy
name: Oswalt Family
name: Oswalt, Robert L.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: peb
subject: poo
subject: kju
subject: pom
subject: peq
subject: pej
subject: pef

description: Carbon copy of Webb, Wall, and Tanous typed manuscript, accompanied by related correspondence between Webb and Oswalt.
Moiré lattice effects on the orbital magnetic response of twisted bilayer graphene and Condon instability
Creators: name: Guerci, Daniele
name: Simon, Pascal
name: Mora, Christophe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyze the orbital magnetic susceptibility from the band structure of twisted bilayer graphene. Close to charge neutrality, the out-of-plane susceptibility inherits the strong diamagnetic response from graphene. Increasing the doping, a crossover from diamagnetism to paramagnetism is obtained and a logarithmic divergence develops at the van Hove singularity of the Moiré lattice in the first band. The enhanced paramagnetism at the van Hove singularity is stronger for relatively large angle but gets suppressed by the flat spectrum towards the vicinity of the first magic angle. A diverging paramagnetic susceptibility indicates an instability towards orbital ferromagnetism with an orbital out-of-plane magnetization and a Landau level structure. The region of instability is however found to be practically very small, parametrically suppressed by the ratio of the electron velocity to the speed of light. We also discuss the in-plane orbital susceptibility at charge neutrality where we find a paramagnetic response and a logarithmic divergence at the magic angle. The paramagnetic response is associated with negative counterflow current in the two layers and does not admit a semiclassical description.
description: 19 pages, 13 figures
Effects of coherence on temporal resolution
Creators: name: De, Syamsundar
name: Gil-Lopez, Jano
name: Brecht, Benjamin
name: Silberhorn, Christine
name: Sanchez-Soto, Luis L.
name: Hradil, Z.
name: Rehacek, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Measuring small separations between two optical sources, either in space or in time, constitute an important metrological challenge as standard intensity-only measurements fail for vanishing separations. Contrarily, it has been established that appropriate coherent mode projections can appraise arbitrarily small separations with quantum-limited precision. However, the question of whether the optical coherence brings any metrological advantage to mode projections is still a point of debate. Here, we elucidate this problem by experimentally investigating the effect of varying coherence on estimating the temporal separation between two single-photon pulses. We show that, for an accurate interpretation, special attention must be paid to properly normalize the quantum Fisher information to account for the strength of the signal. Our experiment demonstrates that coherent mode projections are optimal for any degree of coherence.
description: 7 pages, 4 figures. To be published in Physical Review Research
Complex cooperative networks from evolutionary preferential attachment
Creators: name: Poncela, J.
name: Gomez-Gardenes, J.
name: Floria, L. M.
name: Sanchez, A.
name: Moreno, Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In spite of its relevance to the origin of complex networks, the interplay between form and function and its role during network formation remains largely unexplored. While recent studies introduce dynamics by considering rewiring processes of a pre-existent network, we study network growth and formation by proposing an evolutionary preferential attachment model, its main feature being that the capacity of a node to attract new links depends on a dynamical variable governed in turn by the node interactions. As a specific example, we focus on the problem of the emergence of cooperation by analyzing the formation of a social network with interactions given by the Prisoner's Dilemma. The resulting networks show many features of real systems, such as scale-free degree distributions, cooperative behavior and hierarchical clustering. Interestingly, results such as the cooperators being located mostly on nodes of intermediate degree are very different from the observations of cooperative behavior on static networks. The evolutionary preferential attachment mechanism points to an evolutionary origin of scale-free networks and may help understand similar feedback problems in the dynamics of complex networks by appropriately choosing the game describing the interaction of nodes.
description: 6 pages and 4 figures, APS format. Submitted for publication
Kibble-Zurek mechanism in polariton graphene
Creators: name: Solnyshkov, D.
name: Bessonart, L.
name: Nalitov, A.
name: Malpuech, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the formation of topological defects (quantum vortices) during the formation of a 2D polariton condensate at the $Γ$ point of a honeycomb lattice via the Kibble-Zurek mechanism. The lattice modifies the single-particle dispersion. The typical interaction energies at the quench time correspond to the linear part of the dispersion. The resulting scaling exponent for the density of topological defects is numerically found as $0.95\pm0.05$. This value differs from the one expected for 2D massive particles (1/2), but is indeed compatible with the one expected for a linear dispersion. We moreover demonstrate that the vortices can be pinned to the lattice, which prevents their recombination and could facilitate their observation and counting in continuous wave experiments.
Φυτοχημική μελέτη του διχλωρομεθανικού εκχυλίσματος του φυτού Scutellaria rupestris subsp. adenotricha της οικογένειας Lamiaceae
Creators: name: Ανδρεόπουλος, Ηλίας Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Scutellaria
Φυτοχημική μελέτη
Φυσικά προϊόντα
Phytochemical study
Natural products

description: Η παρούσα μελέτη έχει ως αντικείμενο την απομόνωση και τον προσδιορισμό της δομής των δευτερογενών μεταβολιτών του διχλωρομεθανικού εκχυλίσματος του φυτού Scutellaria rupestris subsp. adenotricha (Boiss. & Heldr.) Greuter & Burdet το οποίο είναι ενδημικό στην Ελλάδα και δεν έχει μελετηθεί το φυτοχημικό του περιεχόμενο. Το γεγονός αυτό σε συνδυασμό με τα σημαντικά ευρήματα που αφορούν το γένος της Scutellaria, ιδιαίτερα σχετικά με τον καρκίνο, μας έκανε να το επιλέξουμε για την διπλωματική εργασία, στόχος της οποίας είναι ο προσδιορισμός του φυτοχημικού περιεχομένου του συγκεκριμένου είδους και η απομόνωση ουσιών οι οποίες θα μπορούσαν σε επόμενο στάδιο να εξετασθούν για πιθανή αντικαρκινική δράση. Για την απομόνωση των μεταβολιτών του φυτού εφαρμόστηκαν χρωματογραφικές μέθοδοι όπως Xρωματογραφία λεπτής στοιβάδας (T.L.C.), Χρωματογραφία στήλης (C.C) και Υγρή Χρωματογραφία Υψηλής Απόδοσης (H.P.L.C.), ενώ για τον προσδιορισμό τους χρησιμοποιήθηκε η Φασματοσκοπία Πυρηνικού Μαγνητικού Συντονισμού (ΝΜR) και οι τεχνικές HSQC, HMBC και COSY. Συγκεκριμένα απομονώθηκαν έξι ουσίες, οι εξής: (1) εικοσιτριάνιο, (2) μυριστικό οξύ, (3) παλμιτικό οξύ, (4) 1-μονολαυρίνη, (5) trans - κινναμωμικό οξύ και (6) μεθυλεστέρας του trans - κουμαρικού οξέος. Από τις ενώσεις αυτές οι ουσίες (4) 1-μονολαυρίνη, (5) trans - κινναμωμικό οξύ και (6) μεθυλεστέρας του trans - κουμαρικού οξέος, απομονώθηκαν για πρώτη φορά από φυτό του γένους Scutellaria, στην παρούσα εργασία.
description: The present study aims at isolating and determining the structure of the secondary metabolites of Scutellaria rupestris subsp. adenotricha (Boiss. & Heldr.) Greuter & Burdet. This plant is endemic in Greece and its phytochemical content had not been studied so far. This is the reason why we choosed it for our study and because the genus of Scutellaria has well established evidence against cancer. So we studied the dichloromethane extract of this plant in order to define its phytochemical content and identify some compounds with potential anticancer activity. Chromatographic methods such as TLC, Column Chromatography (CC), and High Performance Liquid Chromatography (HPLC) were applied to isolate plant metabolites, while Nuclear Magnetic Resonance Spectrometry (NMR) was applied to identify them. To sum up, six substances were isolated, namely: (1) n-tricosane, (2) myristic acid, (3) palmitic acid, (4) 1-monolaurin, (5) trans- cinnamic acid and (6) trans-p-cumaric acid methyl ester. Three of these compounds, substances (4) 1-monolaurin, (5) trans-cinnamic acid and (6) trans-p-cumaric acid methyl ester were isolated for the first time from a plant of genus Scutellaria in the present study.
Πράσινες Δημόσιες Συμβάσεις
Creators: name: Ευθυμιάδης, Στέφανος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Δημόσιες Συμβάσεις
Πράσινη ανάπτυξη
Αειφόρος ανάπτυξη
Public Procurement
Green Growth
Sustainable Development

description: Σκοπός της διατριβής ήταν η μελέτη της αλληλεπίδρασης δημοσίων συμβάσεων και πράσινης ανάπτυξης. Ερευνήθηκε κατά πόσον είναι εφικτό οι δημόσιες συμβάσεις να αποτελέσουν έναν κυρίαρχο τρόπο ενίσχυσης της αρχής της βιώσιμης ανάπτυξη στον ελλαδικό χώρο. Η έρευνα αυτή έγινε μέσω της ανάλυσης του σημερινού καθεστώτος δημοσίων συμβάσεων που διέπει την ελληνική έννομη τάξη και στη συνέχεια ο τρόπος εφαρμογής περιβαλλοντικών κριτήρια κατά την ανάθεση και εκτέλεση δημοσίων συμβάσεων. Στη συνέχεια παρουσιάστηκαν παραδείγματα χρήσης τέτοιων κριτηρίων στον ελληνικό και ευρωπαϊκό χώρο καθώς και εμπόδια στην εφαρμογή περιβαλλοντικών προδιαγραφών, ενώ η έρευνα κατέληξε στην αποτύπωση της σημερινής κατάστασης που επικρατεί επί του θέματος στην Ελλάδα του σήμερα.
description: The purpose of the dissertation was to study the interaction of public procurement and green development. It has been investigated whether public procurement can be a dominant way of strengthening the principle of sustainable development in Greece. This research was carried out by analyzing the current public procurement regime governing the Greek legal order and then applying the environmental criteria when awarding and executing public contracts. Examples of the use of such criteria in the Greek and European contexts as well as obstacles to the implementation of environmental specifications were presented, while the research resulted in the presentation of today's current situation in Greece.
Temporal teleportation with pseudo-density operators: how dynamics emerges from temporal entanglement
Creators: name: Marletto, Chiara
name: Vedral, Vlatko
name: Virzì, Salvatore
name: Avella, Alessio
name: Piacentini, Fabrizio
name: Gramegna, Marco
name: Degiovanni, Ivo Pietro
name: Genovese, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that, by utilising temporal quantum correlations as expressed by pseudo-density operators (PDOs), it is possible to recover formally the standard quantum dynamical evolution as a sequence of teleportations in time. We demonstrate that any completely positive evolution can be formally reconstructed by teleportation with different temporally correlated states. This provides a different interpretation of maximally correlated PDOs, as resources to induce quantum time-evolution. Furthermore, we note that the possibility of this protocol stems from the strict formal correspondence between spatial and temporal entanglement in quantum theory. We proceed to demonstrate experimentally this correspondence, by showing a multipartite violation of generalised temporal and spatial Bell inequalities and verifying agreement with theoretical predictions to a high degree of accuracy, in high-quality photon qubits.
description: preprint
Dot-Science Top Level Domain: academic websites or dumpsites?
Creators: name: Orduna-Malea, Enrique
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: Dot-science was launched in 2015 as a new academic top-level domain (TLD) aimed to provide 'a dedicated, easily accessible location for global Internet users with an interest in science'. The main objective of this work is to find out the general scholarly usage of this top-level domain. In particular, the following three questions are pursued: usage (number of web domains registered with the dot-science), purpose (main function and category of websites linked to these web domains), and impact (websites' visibility and authority). To do this, 13,900 domain names were gathered through ICANN's Domain Name Registration Data Lookup database. Each web domain was subsequently categorized, and data on web impact were obtained from Majestic's API. Based on the results obtained, it is concluded that the dot-science top-level domain is scarcely adopted by the academic community, and mainly used by registrar companies for reselling purposes (35.5% of all web domains were parked). Websites receiving the highest number of backlinks were generally related to non-academic websites applying intensive link building practices and offering leisure or even fraudulent contents. Majestic's Trust Flow metric has been proved an effective method to filter reputable academic websites. As regards primary academic-related dot-science web domain categories, 1,175 (8.5% of all web domains registered) were found, mainly personal academic websites (342 web domains), blogs (261) and research groups (133). All dubious content reveals bad practices on the Web, where the tag 'science' is fundamentally used as a mechanism to deceive search engine algorithms.
description: 24 pages, 11 tables and 6 figures
Functional properties of active site variants of yeast cytochrome C
Creators: name: Rafferty, Steven Patrick
Publisher: name: University of British Columbia
Year: 2008

description: Mitochondrial cytochromes c are small, soluble respiratory proteins which exhibit a high degree of amino acid sequence and tertiary structural homologies across the entire eukaryotic kingdom. Theinfluence of mutations within two conserved regions of yeast-iso-1-cytochrome c on the physicochemical properties of this protein were examined. i) Invariant residue Phe82, located at the exposed heme edge on the protein surface, was replaced by Tyr, Leu, lie, Ala, Ser and Gly. ii) Internal residues Asn52, Tyr67, Thr78 and 1le75 form the environment about WAT166, a buried water molecule near the heme. This region undergoes relatively large oxidation-state linked conformational changes and these residues are collectively referred to as ‘water switch’ residues. The mutants Asn52Ala, Tyr67Phe, Ile75Met and Thr78Gly were studied. The effects of variation at these conserved positions on i) the oxidation-reduction equilibrium, ii) the electron transfer kinetics with inorganic electron transfer partners, and iii) the equilibrium and kinetics of heme axial ligand Met8O displacement by added azide and alkaline pH of yeast iso-1-cytochrome c, were determined. The reduction potentials (pH 6, 25 °C, μ=0.1M) of position 82 mutants decreased by up to 45 mV with decreasing size of the side chain. Small differences in the ΔH° and ΔS° of reduction were responsible for the observed reduction potentials. Electron transfer rates (corrected for driving force and electrostatics) with the inorganic electron transfer partners Fe(edta)^2- (as reductant) and Co(phen)₃ ³⁺ (as oxidant) increased up to 17-fold as the size of the mutant side chain decreased (pH 6, 25 °C, μ= 0.1M). Electron transfer reactivity relative to wild type was dependent on the identity of the inorganic electron transfer partner, indicating that mutations at position 82 change that portion of the surface of the eytochrome that contacts electron transfer partners. Eyring plots of the rate data showed small differences in the activation parameters of the mutants. [more abstract]
Quasinormal modes for integer and half-integer spins within the large angular momentum limit
Creators: name: Chen, Chun-Hung
name: Cho, Hing-Tong
name: Chrysostomou, Anna
name: Cornell, Alan S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: While independent observations have been made regarding the behaviour of effective quasinormal mode (QNM) potentials within the large angular momentum limit, we demonstrate analytically here that a uniform expression emerges for non-rotating, higher-dimensional, and spherically-symmetric black holes (BHs) in this regime for fields of integer and half-integer spin in asymptotically flat and dS BH contexts; a second uniform expression arises for these QNM potentials in AdS BH spacetimes. We then proceed with a numerical analysis based on the multipolar expansion method recently proposed by Dolan and Ottewill to determine the behaviour of quasinormal frequencies (QNF) for varying BH parameters in the eikonal limit. We perform a complete study of Dolan and Ottewill's method for perturbations of spin $s \in \{0,1/2,1,3/2,2 \}$ in 4D Schwarzschild, Reissner-Nordstr{ö}m, and Schwarzschild de Sitter spacetimes, clarifying expressions and presenting expansions and results to higher orders $(\mathcal{O}(L^{-6}))$ than many of those presented in the literature $(\sim \mathcal{O}(L^{-2}))$. We find good agreement with known results of QNFs for low-lying modes; in the large-$\ell$ regime, our results are highly consistent with those of Konoplya's 6th-order WKB method. We confirm a universality in the trends of physical features recorded in the literature for the low-lying QNFs (that the real part grows indefinitely, the imaginary tends to a constant as $\ell \rightarrow \infty$, etc.) as we approach large values of $\ell$ within these spacetimes, and explore the consequent interplay between BH parameters and QNFs in the eikonal limit.
description: 46 pages; added commentary on implementation procedure in Sec. III-A (results unchanged); references added; to appear in Physical Review D (PRD)