cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Angular Dependent Torque Measurements on CeCoIn$_5$ Single Crystals
Creators: name: Xiao, H.
name: Hu, T.
name: Sayles, T. A.
name: Maple, M. B.
name: Almasan, C. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Angular dependent torque measurements were performed on single crystals of CeCoIn$_5$, a heavy fermion superconductor ($T_{c0}$ = 2.3 K), in the temperature, $T$, range 1.9 K $\leq T \leq $ 20 K and magnetic fields $H$ up to 14 T. A large paramagnetic effect is found in the normal state. Torque measurements in the mixed state were also performed. The torque curves show sharp hysteresis peaks at $θ= 90^{o}$ ($θ$ is the angle between $H$ and the $c-$axis of the crystal), a result of intrinsic pinning of vortices. The anisotropy $γ\equiv \sqrt{m_{c}/m_{a}}$ in the mixed state was determined from the reversible part of the vortex contribution to the torque signal using Kogan's model [Phys. Rev. B \textbf{38}, 7049 (1988)]. The anisotropy $γ$ decreases with increasing magnetic field and temperature. The fact that $γ$ is not a constant points towards a multiband scenario in this heavy fermion material.
Rough translation of file 020_B (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio files VP-240713-10 and VP-240713-11: Rough translation (minute-by-minute) of file 020_B (tape 020, side B) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from the beginning of the file to 4:00 and from 4:00 to 12:34; no transcription in this session, translation only. Due to re-numbering, tape 020_B has been assigned to the CLA item number LA256.020, audio file LA256.020B.
Environmental audits: a multi-stakeholder perspective
Creators: name: Aucoin, Louise
Publisher: name: University of British Columbia
Year: 2009

description: Environmental auditing is an emerging environmental management tool that provides potential benefits to private industry, the public, and regulatory authorities as well as to the environment. It is a rare convergence of private and public interests. Corporations addressing the concerns of their stakeholders increasingly take environmental issues into consideration. The public is demanding more transparency from corporations and environmental audits are a necessary tool for corporations to do this. Voluntary environmental audits, combined with an effective enforcement program to the "command and control" legislation encourages corporations to seek pollution avoidance rather than pollution control. It is the way of the future. Mandatory environmental audits at this time would be short sighted and most probably counter-productive. Incentives and the actual driving forces in the market will continue to make environmental auditing an environmental tool of choice for forward looking corporations.
Tunneling currents in ferromagnetic systems with multiple broken symmetries
Creators: name: Linder, J.
name: Gronsleth, M. S.
name: Sudbo, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: SHORTENED ABSTRACT: A system exhibiting multiple simultaneously broken symmetries offers the opportunity to influence physical phenomena such as tunneling currents by means of external control parameters. In this paper, we consider the broken SU(2) (internal spin) symmetry of ferromagnetic systems coexisting with \textit{i)} the broken U(1) symmetry of superconductors and \textit{ii)} the broken spatial inversion symmetry induced by a Rashba term in a spin-orbit coupling Hamiltonian. In order to study the effect of these broken symmetries, we consider tunneling currents that arise in two different systems; tunneling junctions consisting of non-unitary spin-triplet ferromagnetic superconductors and junctions consisting of ferromagnets with spin-orbit coupling.
description: Accepted for publication in Phys. Rev. B
Canonical Correlation and Assortative Matching: A Remark
Creators: name: Dupuy, Arnaud
name: Galichon, Alfred
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Economics (econ.GN)
subject: FOS: Economics and business

description: In the context of the Beckerian theory of marriage, when men and women match on a single-dimensional index that is the weighted sum of their respective multivariate attributes, many papers in the literature have used linear canonical correlation, and related techniques, in order to estimate these weights. We argue that this estimation technique is inconsistent and suggest some solutions.
description: 11 pages
On the angular momentum evolution of merged white dwarfs
Creators: name: Gourgouliatos, K. N.
name: Jeffery, C. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the angular momentum evolution of binaries containing two white dwarfs which merge and become cool helium-rich supergiants. Our object is to compare predicted rotation velocities with observations of highly evolved stars believed to have formed from such a merger, including RCrB and extreme helium stars. The principal study involves a binary containing a 0.6 solar mass CO white dwarf, and a 0.3 solar mass He white dwarf. The initial condition for the angular momentum distribution is defined where the secondary fills its Roche Lobe. We assume conservation of angular momentum to compute the angular momentum distribution in a collisionless disk and subsequently in the giant envelope. At the end of shell-helium burning, the giant contracts to form a white dwarf. We derive the surface rotation velocity during this contraction. The calculation is repeated for a range of initial mass ratios, and also for the case of mergers between two helium white dwarfs; the latter will contract to the helium main-sequence rather than the white dwarf sequence. Assuming complete conservation of angular momentum, we predict acceptable angular rotation rates for cool giants and during the initial subsequent contraction. However such stars will only survive spin-up to reach the white dwarf sequence (CO+He merger) if the initial mass ratio is close to unity. He+He merger products must lose angular momentum in order to reach the helium main sequence. Minimum observed rotation velocities in extreme helium stars are lower than our predictions by at least one half, indicating that CO+He mergers must lose at least one half of their angular momentum.
description: 11 pages, 11 figures, MNRAS in press
Dynamics of a tagged particle in the asymmetric exclusion process with the step initial condition
Creators: name: Imamura, T.
name: Sasamoto, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Probability (math.PR)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The one-dimensional totally asymmetric simple exclusion process (TASEP) is considered. We study the time evolution property of a tagged particle in TASEP with the step-type initial condition. Calculated is the multi-time joint distribution function of its position. Using the relation of the dynamics of TASEP to the Schur process, we show that the function is represented as the Fredholm determinant. We also study the scaling limit. The universality of the largest eigenvalue in the random matrix theory is realized in the limit. When the hopping rates of all particles are the same, it is found that the joint distribution function converges to that of the Airy process after the time at which the particle begins to move. On the other hand, when there are several particles with small hopping rate in front of a tagged particle, the limiting process changes at a certain time from the Airy process to the process of the largest eigenvalue in the Hermitian multi-matrix model with external sources.
description: 48 pages, 8 figures
New sub-grouping of multiple stellar populations in NGC 2808 based on low-resolution spectroscopy
Creators: name: Hong, Seungsoo
name: Lim, Dongwook
name: Chung, Chul
name: Kim, Jaeyeon
name: Han, Sang-Il
name: Lee, Young-Wook
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We performed low-resolution spectroscopy for the red giant branch stars in an intriguing globular cluster (GC) NGC 2808, which hosts subpopulations with extreme helium and light-element abundances. In order to trace N, C, and Ca abundance differences among subpopulations, we measured CN, CH, and Ca II H&K spectral indices, respectively. We identified four subpopulations (G1, G2, G3, and G4) from CN and CH strength, with CN-weak/CH-strong G1, CN-intermediate/CH-strong G2, CN-strong/CH-intermediate G3, and CN-strong/CH-weak G4. Compared to [Na/O] from high-resolution spectroscopy, we show that CN index can more clearly separate G1 and G2. Since CN traces N abundance in a GC, it implies that G1 and G2 would show a larger difference in [N/Fe] compared to [Na/Fe], as predicted by chemical evolution models. Later generation stars G3 and G4, however, are better separated with high-resolution spectroscopy. We also found that G4 shows a stronger Ca II H&K line strength compared to that of G1, but we suspect this to be a result of unusually strong He enhancement and/or Mg depletion in G4 of this GC. This work illustrates that combining low- and high-resolution spectroscopic studies can improve the separation of subpopulations in GCs.
description: Accepted for publication in AJ
Limits to the analogue Hawking temperature in a Bose-Einstein condensate
Creators: name: Wuester, S.
name: Savage, C. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Quasi-one dimensional outflow from a dilute gas Bose-Einstein condensate reservoir is a promising system for the creation of analogue Hawking radiation. We use numerical modeling to show that stable sonic horizons exist in such a system under realistic conditions, taking into account the transverse dimensions and three-body loss. We find that loss limits the analogue Hawking temperatures achievable in the hydrodynamic regime, with sodium condensates allowing the highest temperatures. A condensate of 30,000 atoms, with transverse confinement frequency omega_perp=6800*2*pi Hz, yields horizon temperatures of about 20 nK over a period of 50 ms. This is at least four times higher than for other atoms commonly used for Bose-Einstein condensates.
description: 9 pages, 4 figures, replaced with published version
Pollution control, administrative discretion and science: a journey through the maze of environmental law
Creators: name: Findlay, Caroline K. H.
Publisher: name: University of British Columbia
Year: 2008

description: This thesis explores the interface between environmental regulatory discretion and scientific complexities. Two key observations about the nature of scientific information are made which lead to the argument in this thesis that science must be made more explicit in environmental decision making processes. First, scientific analysis is crucial to understanding the impact of pollution on the natural environment. Thus, it is fundamental to the design and implementation of environmental laws. Secondly, scientific information has certain methodological limitations and inherent uncertainties which often make it subject to interpretation and value judgments. These judgments involve important policy choices about environmental risks. In Canada, the use of science to shape environmental laws is a matter for bureaucratic discretion that is rarely subject to external scrutiny. This thesis argues for an express statutory obligation on environmental administrators to disclose and to explain the scientific analysis used to support the exercise of their discretion in making regulatory decisions. Discretionary powers are a necessary and permanent part of the Canadian legal landscape of environmental protection. Within this regulatory context, science is segregated as the rational "factual" basis for decisions when, in fact, science cannot be disentangled from the economic, political and social dynamics that influence regulatory discretion. The implications of this are illustrated by the experience of the United States which is considered for purposes of comparison in this thesis. Under U.S. environmental laws, regulators are required to disclose and to explain the scientific analysis used to support their regulatory decisions. While it is clear that a procedural "fix" is not a panacea, it does offer some distinct advantages that enhance the democratic legitimacy of environmental decision making. In short, a legal duty of this kind will improve the process of environmental decision making in Canada: (1) by requiring a more thoughtful analysis of the administrative task and the relevant information and thus increasing the accountability of regulators; and (2) by helping to harness and make accessible a valuable pool of knowledge. As a result, the integrity of the decision making process in Canada will be improved by making analysis more transparent and subject to challenge.
Structural and magnetic properties of the new quantum magnet BaCuTe$_2$O$_6$
Creators: name: Samartzis, A.
name: Khalyavin, D.
name: Islam, A. T. M. N.
name: Chillal, S.
name: Siemensmeyer, K.
name: Prokes, K.
name: Voneshen, D. J.
name: Senyshyn, A.
name: Lake, B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the structural and magnetic properties of the new quantum magnet BaCuTe$_2$O$_6$. This compound is synthesized for the first time in powder and single crystal form. Synchrotron X-ray and neutron diffraction reveal a cubic crystal structure (P4$_1$32) where the magnetic Cu$^{2+}$ ions form a complex network. Physical properties measurements suggest the presence of antiferromagnetic interactions with a Curie-Weiss temperature of -33K, while long-range magnetic order occurs at the much lower temperature of ~6.3K. The magnetic structure, solved using neutron diffraction, reveals antiferromagnetic order along chains parallel to the a, b and c crystal axes. This is consistent with the magnetic excitations which resemble the multispinon continuum typical of the spin-1/2 Heisenberg antiferromagnetic chain. A consistent intrachain interaction value of ~34K is achieved from the various techniques. Finally the magnetic structure provides evidence that the chains are coupled together in a non-colinear arrangement by a much weaker antiferromagnetic, frustrated hyperkagome interaction.
Hydrogen issue in Core Collapse Supernovae
Creators: name: Elmhamdi, A.
name: Danziger, I. J.
name: Branch, D.
name: Leibundgut, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss results of analyzing a time series of selected photospheric-optical spectra of core collapse supernovae (CCSNe). This is accomplished by means of the parameterized supernovae synthetic spectrum (SSp) code ``SYNOW''. Special attention is addressed to traces of hydrogen at early phases, especially for the stripped-envelope SNe (i.e. SNe Ib-c). A thin low mass hydrogen layer extending to very high ejection velocities above the helium shell, is found to be the most likely scenario for Type Ib SNe.
description: 8 pages. Proceedings of the conference ``The Multicoloured Landscape of Compact Objects and their Explosive Origins'', 2006 June 11--24, Cefalu, Sicily, to be published by AIP
The Dayside Ionopause of Mars: Solar Wind Interaction, Pressure Balance, and Comparisons with Venus
Creators: name: Chu, F.
name: Girazian, Z.
name: Duru, F.
name: Ramstad, R.
name: Halekas, J.
name: Gurnett, D. A.
name: Cao, Xin
name: Kopf, A. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Space Physics (physics.space-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Due to the lower ionospheric thermal pressure and existence of the crustal magnetism at Mars, the Martian ionopause is expected to behave differently from the ionopause at Venus. We study the solar wind interaction and pressure balance at the ionopause of Mars using both in situ and remote sounding measurements from the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) instrument on the Mars Express orbiter. We show that the magnetic pressure usually dominates the thermal pressure to hold off the solar wind at the ionopause at Mars, with only 13% of the cases where the ionospheric thermal pressure plays a more important role in pressure balance. This percentage at Venus, however, is up to 65%. We also find that the ionopause altitude at Mars decreases as the normal component of the solar wind dynamic pressure increases, similar to the altitude variation of the ionopauses at Venus. Moreover, our results show that the ionopause thickness at Mars and Venus is mainly determined by the ion gyromotion and is equivalent to about 5 ion gyroradii.
Imaging geometry through dynamics: the observable representation
Creators: name: Gaveau, Bernard
name: Schulman, Lawrence S.
name: Schulman, Leonard J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: For many stochastic processes there is an underlying coordinate space, $V$, with the process moving from point to point in $V$ or on variables (such as spin configurations) defined with respect to $V$. There is a matrix of transition probabilities (whether between points in $V$ or between variables defined on $V$) and we focus on its ``slow'' eigenvectors, those with eigenvalues closest to that of the stationary eigenvector. These eigenvectors are the ``observables,'' and they can be used to recover geometrical features of $V$.
Max Headroom: Discretionary Capital Buffers and Bank Risk
Creators: name: Lubberink, Martien
Publisher: name: Open Access Te Herenga Waka-Victoria University of Wellington
Year: 2022
Subjects: subject: 150299 Banking, Finance and Investment not elsewhere classified
subject: FOS: Economics and business
subject: Law
subject: FOS: Law
subject: 150199 Accounting, Auditing and Accountability not elsewhere classified

description: No description supplied
Rough translation of file 020_A (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-240713-09: Rough translation (minute-by-minute) of file 020_A (tape 020, side A) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from approximately 41:02 to the end of the file; no transcription in this session, translation only. Due to re-numbering, tape 020_A has been assigned to the CLA item number LA256.020, audio file LA256.020A.
Dark Matter Absorption via Electronic Excitations
Creators: name: Mitridate, Andrea
name: Trickle, Tanner
name: Zhang, Zhengkang
name: Zurek, Kathryn M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We revisit the calculation of bosonic dark matter absorption via electronic excitations. Working in an effective field theory framework and consistently taking into account in-medium effects, we clarify the relation between dark matter and photon absorption. As is well-known, for vector (dark photon) and pseudoscalar (axion-like particle) dark matter, the absorption rates can be simply related to the target material's optical properties. However, this is not the case for scalar dark matter, where the dominant contribution comes from a different operator than the one contributing to photon absorption, which is formally next-to-leading-order and does not suffer from in-medium screening. It is therefore imperative to have reliable first-principles numerical calculations and/or semi-analytic modeling in order to predict the detection rate. We present updated sensitivity projections for semiconductor crystal and superconductor targets for ongoing and proposed direct detection experiments.
description: 25 pages + appendices, 3 figures
Entropy methods for identifying hedonic models
Creators: name: Dupuy, Arnaud
name: Galichon, Alfred
name: Henry, Marc
Publisher: name: arXiv
Year: 2021
Subjects: subject: Econometrics (econ.EM)
subject: FOS: Economics and business

description: This paper contributes to the literature on hedonic models in two ways. First, it makes use of Queyranne's reformulation of a hedonic model in the discrete case as a network flow problem in order to provide a proof of existence and integrality of a hedonic equilibrium and efficient computation of hedonic prices. Second, elaborating on entropic methods developed in Galichon and Salanié (2014), this paper proposes a new identification strategy for hedonic models in a single market. This methodology allows one to introduce heterogeneities in both consumers' and producers' attributes and to recover producers' profits and consumers' utilities based on the observation of production and consumption patterns and the set of hedonic prices.
description: 18 pages
A Comparative study of the contract remedy systems between Anglo-American law and Chinese law
Creators: name: Yin, Li
Publisher: name: University of British Columbia
Year: 2008

description: This thesis presents a comparative study of the contract remedy systems between Chinese law and Anglo-American law. The main aim is to deepen the understanding of both contract remedy systems, particularly to enhance an understanding of the different principles and features of contract remedies in both legal systems. The study centres on two major issues which are the most striking differences between the two contract remedy systems: the principle of specific performance in Chinese law versus the use of monetary damages in Anglo-American law; and the principle of punishment in Chinese law versus the principle of compensation in Anglo-American law. The study strives not only to identify the differences, but also to look into the underlying reasons and implications of those differences. Special effort is made to illustrate these differences in the context of social, economic and cultural perspectives. Much of the discussion is devoted to examining and analyzing the relations and interactions between law and the social and economic environment, especially the great impact which the social system, economic structure, ideology and legal culture of a society have on its contract law. The hypothesis is that legal principles and doctrines are but the expressions in legal forms of the conditions of social and economic life in a society. The principles of a contract remedy system are decided and significantly influenced by the social and economic factors of a society within which the remedy system operates. Therefore, the rules and principles of contract remedies differ substantially between a planned economy and a market economy. And the contrast reflects the different needs of the two societies and the different responses made at the level of law to those needs. In the Chinese context of a planned scarcity economy, contract remedy principles in particular serve to promote the purpose of contracts in implementing the state economic plan. Realization and guarantee of the state economic plan is the touchstone of contract remedies. However, in the context of a market economy, contract remedial rules emphasize a great degree of flexibility and choice to individuals, with minimal government intervention. It is believed that such flexibility and choices can maximize social welfare and promote the operations of a market economy. The study also tries to make a brief critical re-assessment of the specific performance principle and punitive principle of Chinese contract remedies in the changing situations of China which may call for specific reforms in the existing Chinese economic contract law.
Συμβολή στην ανάπτυξη βάσης δεδομένων για το ελληνικό παρθένο ελαιόλαδο. Σύσταση σε λιπαρά οξέα, τριακυλογλυκερόλες και σκουαλένιο
Creators: name: Αδαμοπούλου, Ευρώπη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ελληνικό παρθένο ελαιόλαδο
Λιπαρά οξέα
Τριακυλογλυκερόλες
Greek virgin olive oil
Fatty acids
Triacylglycerols

description: Σκοπός της παρούσας διπλωματικής εργασίας ήταν η συμβολή στην ανάπτυξη βάσης δεδομένων για το ελληνικό παρθένο ελαιόλαδο με έμφαση στη σύσταση σε λιπαρά οξέα, τριακυλογλυκερόλες και σκουαλένιο. Πιο συγκεκριμένα, πραγματοποιήθηκε ποσοτικός προσδιορισμός της σύστασης σε λιπαρά οξέα σε 87 δείγματα παρθένου ελαιόλαδου (80 ελληνικής, 4 ιταλικής και 3 ισπανικής προέλευσης) με χρήση αέριας χρωματογραφίας (GC-FID). Με βάση τα παραπάνω δεδομένα υπολογίσθηκε η σύσταση των ίδιων δειγμάτων σε τριακυλογλυκερόλες σύμφωνα με τη μέθοδο COI/T.20/Doc. No 20 /Rev. 4 /2017. Επιπλέον, έγινε προσπάθεια εξήγησης της διασποράς των ελληνικών παρθένων ελαιόλαδων που παρατηρήθηκε με τη χημειομετρική ανάλυση (Ανάλυση Κυρίων Συνιστωσών, PCA) φασμάτων ATR-FT-IR (φασματοσκοπία μέσου υπερύθρου με μετασχηματισμό Fourier με λήψη φάσματος με κυψελίδα εξασθενημένης ολικής ανάκλασης) με τη βοήθεια της πληροφορίας από τη χημική σύσταση σε λιπαρά οξέα και τριακυλογλυκερόλες. Τέλος, έλαβε χώρα ποσοτικός προσδιορισμός στο κύριο ήσσον συστατικό του παρθένου ελαιολάδου, το σκουαλένιο ταυτόχρονα με τον προσδιορισμό των λιπαρών οξέων με αέρια χρωματογραφία. Η συγκέντρωση του βρέθηκε εντός του βιβλιογραφικού εύρους τιμών με το 90% των ελληνικών δειγμάτων να παρουσιάζει χαμηλή έως μεσαία περιεκτικότητα. Τα αποτελέσματα της παρούσας εργασίας μαζί με εκείνα για άλλα συστατικά του παρθένου ελαιολάδου συμβάλλουν στην ανάπτυξη βάσης δεδομένων για το πολύτιμο αυτό προϊόν
description: The aim of this thesis was to contribute to the development of a database for Greek virgin olive oil with an emphasis on fatty acids, triacylglycerols and squalene composition. Specifically, a quantitative determination of the fatty acid composition was performed on 87 samples of virgin olive oil (80 Greek, 4 Italian and 3 Spanish origin) using Gas Chromatography (GC-FID). Based on the above data, the composition in triacylglycerols (of the same samples) was calculated according to the COI/T.20/Doc. No 20 /Rev. 4 /2017. These data were then used to explain oil grouping from ATR-FT-IR (Fourier transform infrared spectroscopy using an Attenuated Total Reflection cell) after chemometric processing with Principal Component Analysis (PCA). Finally, quantitative determination of the main minor component, squalene, took place simultaneously with the determination of fatty acids with Gas Chromatography. Concentrations were found to be within literature range; the 90% percent of Greek samples showed a low to medium squalene content. The present data together with those for other constituents for the same oil samples contribute towards building up a data base for this precious Greek product
Lorentz Violation and Torsion
Creators: name: Russell, Neil
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this proceedings, similarities between the structure of theories with Lorentz violation and theories with constant torsion in flat spacetime are exploited to place bounds on torsion components. An example is given showing the analysis leading to bounds on the axial-vector and mixed-symmetry components of torsion, based on a dual-maser experiment.
description: 5 pp, talk given at 4th Meeting on Lorentz and CPT Violation, Bloomington, Indiana, USA, 8-11 August 2007
Catalyzed Baryogenesis
Creators: name: Bai, Yang
name: Berger, Joshua
name: Korwar, Mrunal
name: Orlofsky, Nicholas
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A novel mechanism, "catalyzed baryogenesis," is proposed to explain the observed baryon asymmetry in our universe. In this mechanism, the motion of a ball-like catalyst provides the necessary out-of-equilibrium condition, its outer wall has CP-violating interactions with the Standard Model particles, and its interior has baryon number violating interactions. We use the electroweak-symmetric ball model as an example of such a catalyst. In this model, electroweak sphalerons inside the ball are active and convert baryons into leptons. The observed baryon number asymmetry can be produced for a light ball mass and a large ball radius. Due to direct detection constraints on relic balls, we consider a scenario in which the balls evaporate, leading to dark radiation at testable levels.
description: 15 pages, 3 figures
The Near-infrared S0 Survey III: Morphology of 15 Southern Early-type Disk Galaxies
Creators: name: Laurikainen, E.
name: Salo, H.
name: Buta, R.
name: Knapen, J.
name: Speltincx, T.
name: Block, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Structural analysis has been performed for a sample of 15 Southern early-type disk galaxies, mainly S0s, using high resolution $K_s$-band images. The galaxies are mostly barred and many of them show multiple structures including bars and ovals, typical for S0s. The new images are of sufficient quality to reveal new detail on the morphology of the galaxies. For example, we report a hitherto undetected nuclear ring in NGC 1387, a nuclear bar in NGC 1326, and in the residual image also a weak primary bar in NGC 1317. For the galaxies we (1) measure the radial profiles of the orientation parameters derived from the elliptical isophotes, (2) apply Fourier methods for calculating tangential forces, and particularly, (3) apply structural decomposition methods. For galaxies with multiple structures a 2-dimensional method is found to be superior to a 1-dimensional method, but only if in addition to the bulge and the disk, at least one other component is taken into account. {\it We find strong evidence of pseudo-bulges in S0s}: ten of the galaxies have the shape parameter of the bulge near to $n$ = 2, indicating that the bulges are more disk-like than following the R$^{1/4}$-law. Also, six of the galaxies have either nuclear rings, nuclear bars or nuclear disks. In all non-elliptical galaxies in our sample the $B/T < $ 0.4, as typically found in galaxies having pseudo-bulges. In two of the galaxies the $B/T$ flux ratio is as small as in typical Sc-type spirals. This might be the hitherto undiscovered link in the scenario in which spirals are transformedinto S0s. Also, bars in S0s are found to be shorter and less massive, and have smaller bar torques than bars in S0/a-type galaxies.
description: 51 pages, 9 eps figures, 8 ps figures. Accepted to AJ
Exact Solutions of Regge-Wheeler Equation
Creators: name: Fiziev, Plamen P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Regge-Wheeler equation describes the axial perturbations of Schwarzschild metric in linear approximation. We present its exact solutions in terms of the confluent Heun's functions, the basic properties of the general solution, novel analytical approach and numerical techniques for study of different boundary problems which correspond to quasi-normal modes of black holes and other simple models of compact objects. We depict in more detail the exact solutions of Regge-Wheeler equation in the Schwarzschild black hole interior and on Kruscal-Szekeres manifold.
description: 13 pages, 8 figures, latex file. Talk given at XXIV Spanish Relativity Meeting E.R.E. 2006, to appear in Journal of Physics, Conference Series
3D Αποτύπωση και 3D εκτύπωση των λουτρών “Φοίνιξ”
Creators: name: Συμεωνίδης, Αναστάσιος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Λουτρά
Νέφος σημείων
Μοντελοποίηση
Baths
Point cloud
Modelling

description: To αντικείμενο της παρούσας διπλωματικής είναι η τρισδιάστατη αποτύπωση των λουτρών Φοίνιξ στη Θεσσαλονίκη για την εξοικίωση με τις σύγχρονες τεχνικές αποτύπωσης μνημείων και αρχαιολογικών χώρων. Αρχικά γίνεται λόγος για τη δομή της συγκεκριμένης εργασίας καθώς και για τη δομή και τη λειτουργία των οθωμανικών λουτρών στον ελλαδικό χώρο από την εποχή της οθωμανικής αυτοκρατορίας και την εξέλιξή τους με την πάροδο των χρόνων μέχρι και σήμερα, ενώ αναφέρονται επίσης και τα σημαντικότερα οθωμανικά λουτρά που σώζονται ακόμα στην πόλη της Θεσσαλονίκης. Στη συνέχεια, παρουσιάζονται οι τεχνικές συντήρησης και αποκατάστασης μνημείων που χρησιμοποιούνταν παλαιότερα και γίνεται σύγκριση με τις πιο σύγχρονες τεχνικές που χρησιμοποιούνται τη σημερινή εποχή και επιπλέον γίνεται αναλυτική περιγραφή των αρχών, των μεθόδων και των οργάνων που χρησιμοποιούνται στα πλαίσια τρισδιάστατων αποτυπώσεων που αποτελεί και το βασικό αντικείμενο μελέτης της εργασίας. Τέλος, γίνεται περιγραφή των λουτρών Φοίνιξ εστιάζοντας στη δομή, αλλά και τις παλαιότερες προσπάθειες αποκατάστασης που έγιναν στο μνημείο και κλείνοντας παρατίθεται η διαδικασία αποτύπωσης και τα εξαγόμενα αποτελέσματα και συμπεράσματα αυτής στη συγκεκριμένη περίπτωση
description: The subject of this thesis is the three-dimensional mapping of Phoenix baths in Thessaloniki to familiarize with the modern scanning techniques of monuments and archaeological sites. To begin with, the structure of this particular thesis as well as the structure and operation of the Ottoman baths in Greece since the Ottoman Empire and their evolution over the years to date are being referred, while the most important Ottoman baths that are still preserved in the city of Thessaloniki are mentioned as well. Following that, the techniques used for the preservation and restoration of monuments used in the past and compared with the most modern techniques used today are presented, and then there is a detailed description of the principles, methods and instruments used in the three-dimensional scanning, which is that main subject of this thesis. Finally, the Phoenix baths are described focusing on the structure, as well as the older restoration efforts made at the monument, and concludes with an outline of the scanning process and its outputs and conclusions in this particular case
Sexual assault: public debate and criminal law reform
Creators: name: Horner, Jessie J.
Publisher: name: University of British Columbia
Year: 2008

description: Canada's most recent amendments to the criminal law on sexual assault were developed in consultation with women's groups in response to the decision of the Supreme Court of Canada that existing restrictions on the admission of evidence of the sexual pasts of complainants in sexual offences is unconstitutional. The amendments dealt with the evidentiary issues, and, as well, the definition of consent, and the availability of the defence of mistaken belief in consent in sexual offences. Each of the three major political parties supported the new law. However, the women's groups that had originally been involved in its development sought to have several substantial changes made to it, and opposition to the Bill from defence lawyers, civil liberties associations and law professors was strong. In this thesis, I review the substantive law relating to the amendments, and the arguments in the House of Commons, in Parliamentary committee, and in the media, all of which formed the public debate on the Bill. Key issues were whether criminal law should be used to advance social justice for women, and whether the new law contradicts the "natural order". A major argument against the Bill was that it contravened the fundamental principles of criminal law. It was argued that the fundamental principles should take priority over the Bill. Each of the issues is considered in this work. The major thrust, however, is on the normative value of the so-called principles of criminal law, which I argue are variously indeterminate and abstract, controversial and leading to unduly legalistic arguments. I consider some sources of these arguments and compare the approach taken in relation to the sexual assault amendments with that taken in another major law reform project, that of the recodification of the criminal law. It is my thesis that primacy should not be afforded the principles. At issue is the ability of Parliament to reform criminal law to meet emerging socialissues. Against Parliament's competence to enact useful legislation is pitted the reified ways and means of doing criminal law in the past.
Participation costs dismiss the advantage of heterogeneous networks in evolution of cooperation
Creators: name: Masuda, Naoki
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Real social interactions occur on networks in which each individual is connected to some, but not all, of others. In social dilemma games with a fixed population size, heterogeneity in the number of contacts per player is known to promote evolution of cooperation. Under a common assumption of positively biased payoff structure, well-connected players earn much by playing frequently, and cooperation once adopted by well-connected players is unbeatable and spreads to others. However, maintaining a social contact can be costly, which would prevent local payoffs from being positively biased. In replicator-type evolutionary dynamics, it is shown that even a relatively small participation cost extinguishes the merit of heterogeneous networks in terms of cooperation. In this situation, more connected players earn less so that they are no longer spreaders of cooperation. Instead, those with fewer contacts win and guide the evolution. The participation cost, or the baseline payoff, is irrelevant in homogeneous populations but is essential for evolutionary games on heterogeneous networks.
description: 4 figures + 3 supplementary figures
Dynamics of the Narrow-Line Region in the Seyfert 2 Galaxy NGC 1068
Creators: name: Das, V.
name: Crenshaw, D. M.
name: Kraemer, S. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present dynamical models based on a study of high-resolution long-slit spectra of the narrow-line region (NLR) in NGC 1068 obtained with the Space Telescope Imaging Spectrograph (STIS) aboard The Hubble Space Telescope (HST). The dynamical models consider the radiative force due to the active galactic nucleus (AGN), gravitational forces from the supermassive black hole (SMBH), nuclear stellar cluster, and galactic bulge, and a drag force due to the NLR clouds interacting with a hot ambient medium. The derived velocity profile of the NLR gas is compared to that obtained from our previous kinematic models of the NLR using a simple biconical geometry for the outflowing NLR clouds. The results show that the acceleration profile due to radiative line driving is too steep to fit the data and that gravitational forces along cannot slow the clouds down, but with drag forces included, the clouds can slow down to the systemic velocity over the range 100--400 pc, as observed. However, we are not able to match the gradual acceleration of the NLR clouds from ~0 to ~100 pc, indicating the need for additional dynamical studies.
description: Paper prepared by emulateapj version 10/09/06 and accepted for print in ApJ
Μελέτη εκχύλισης χρωστικών από καρπό αρώνιας και φύλλα υσσώπου
Creators: name: Μακρή, Κωνσταντίνα Μαρία
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αρώνια
Ύσσωπος
Συγχρωματισμός
Aronia melanocarpa
Hyssopus officinalis L
Copigmentation

description: Τα εκχυλίσματα αρώνιας (Aronia melanocarpa) και υσσώπου (Hyssopus officinalis L) μελετήθηκαν με σκοπό την αξιοποίηση του συγχρωματισμού μεταξύ των ανθοκυανών και των φαινολικών τους συστατικών για την παραγωγή φυσικών χρωστικών. Μελετήθηκε η χρωματική σταθερότητα διαλυμάτων αρώνιας – υσσώπου σε δύο αναλογίες (2:1 v/v και 1:1 v/v), προσδιορίζοντας τις χρωματικές παραμέτρους brown index, violet index, την απορρόφηση σε μήκος κύματος 523 nm, την πυκνότητα χρώματος και την απόχρωση. Επιπλέον εξετάστηκε η επίδραση του δισθενή θειικού σιδήρου, του χλωριούχου ασβεστίου, του ασκορβικού οξέος, της β-κυκλοδεξτρίνης και εκχυλίσματος καρπού ελιάς στη χρωματική σταθερότητα των διαλυμάτων. Διερευνήθηκε επίσης η επίδραση των συνθηκών διατήρησης στη σταθερότητα των χρωστικών στο φως, στο σκοτάδι, στους 30ο C και στους 3ο C. Ο συγχρωματισμός μεταξύ ανθοκυανινών και φαινολικών συστατικών από αρώνια και ύσσωπο υφίσταται. Η β-κυκλοδεξτρίνη επιδρά θετικά στο συγχρωματισμό με τη δημιουργία συμπλόκων εγκλεισμού των χρωστικών. Η διατήρηση σε συνθήκες σκότους και χαμηλής θερμοκρασίας συμβάλλουν στη διατήρηση του χρώματος για περισσότερο χρόνο
description: Aronia (Aronia melanocarpa) and hyssop (Hyssopus officinalis L) extracts were studied in order to be used as natural food pigments by copigmentation. Aronia and hyssop extracts solution ratio was studied (2:1 v/v and 1:1 v/v) by assessing the color parameters of brown index, violet index, absorbance at 523 nm, color density and color hue / tint. Moreover, the effect on color stability of iron (II) sulfate, calcium chloride, ascorbic acid, beta cyclodextrin and olive fruit extract were examined. Storage conditions of sunlight, darkness, temperatures of 30o C and 3o C, were also assessed for their effects on pigment solutions. Copigmentation subsists between anthocyanins and phenolic compounds of aronia and hyssop. Beta cyclodextrin had a positive effect on copigmentation by forming pigment inclusion complexes. Color protection is also achieved by storage in dark and at low temperature conditions
Understanding the 8 micron vs. Pa-alpha relationship on sub-arcsecond scales in Luminous Infrared Galaxies
Creators: name: Diaz-Santos, Tanio
name: Alonso-Herrero, Almudena
name: Colina, Luis
name: Packham, Christopher
name: Radomski, James T.
name: Telesco, Charles M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This work explores in detail the relation between the 8 micron and the Pa-alpha emissions for 122 HII regions identified in a sample of 10 low-z LIRGs with nearly constant metallicity (12 + log (O/H) ~ 8.8). We use Gemini/T-ReCS high-spatial resolution (
description: 16 pages, 9 figures, accepted for publication in ApJ; paper with full-resolution figures can be found at: http://damir.iem.csic.es/extragalactic/
Magnetically switchable spin wave retarder with $90^\circ$ antiferromagnetic domain wall
Creators: name: Ye, Feiyang
name: Lan, Jin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Polarization, denoting the precession direction with respect to the background magnetization, is an intrinsic degree of freedom of spin wave. Using magnetic textures to control the spin wave polarization is fundamental and indispensable toward reprogrammable polarization-based magnonics. Here, we show that due to the intrinsic cubic anisotropy, a $90^\circ$ antiferromagnetic domain wall naturally acts as a spin wave retarder (wave-plate). Moreover, for a $90^\circ$ domain wall pair developed by introducing a second domain in a homogenous antiferromagnetic wire, the sign of retarding effect can be flipped by simply switching the direction of the intermediate domain.
description: 7 pages, 5 figures
Passing Through Narrow Gaps with Deep Reinforcement Learning
Creators: name: Tidd, Brendan
name: Cosgun, Akansel
name: Leitner, Jurgen
name: Hudson, Nicolas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The U.S. Defense Advanced Research Projects Agency (DARPA) Subterranean Challenge requires teams of robots to traverse difficult and diverse underground environments. Traversing small gaps is one of the challenging scenarios that robots encounter. Imperfect sensor information makes it difficult for classical navigation methods, where behaviours require significant manual fine tuning. In this paper we present a deep reinforcement learning method for autonomously navigating through small gaps, where contact between the robot and the gap may be required. We first learn a gap behaviour policy to get through small gaps (only centimeters wider than the robot). We then learn a goal-conditioned behaviour selection policy that determines when to activate the gap behaviour policy. We train our policies in simulation and demonstrate their effectiveness with a large tracked robot in simulation and on the real platform. In simulation experiments, our approach achieves 93\% success rate when the gap behaviour is activated manually by an operator, and 63\% with autonomous activation using the behaviour selection policy. In real robot experiments, our approach achieves a success rate of 73\% with manual activation, and 40\% with autonomous behaviour selection. While we show the feasibility of our approach in simulation, the difference in performance between simulated and real world scenarios highlight the difficulty of direct sim-to-real transfer for deep reinforcement learning policies. In both the simulated and real world environments alternative methods were unable to traverse the gap.
description: Submitted to 2021 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)
Time Variation of Fine Structure Constant and Proton-Electron Mass Ratio with Quintessence
Creators: name: Lee, Seokcheon
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent astrophysical observations of quasar absorption systems indicate that the fine structure constant $α$ and the proton-electron mass ratio $μ$ may have evolved through the history of the universe. Motivated by these observations, we consider the cosmological evolution of a quintessence-like scalar field $ϕ$ coupled to gauge fields and matter which leads to effective modifications of the coupling constants and particle masses over time. We show that a class of models where the scalar field potential $V(ϕ)$ and the couplings to matter $B(ϕ)$ admit common extremum in $ϕ$ naturally explains constraints on variations of both the fine structure constant and the proton-electron mass ratio.
description: 9 pages, 4 figures, CosPA 2006 Proceeding. 9 pages, 4 figures, CosPA 2006 Proceeding will be published in the Mod. Phys. Lett. A
Magic State Distillation from Entangled States
Creators: name: Bao, Ning
name: Cao, ChunJun
name: Su, Vincent Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Magic can be distributed non-locally in many-body entangled states, such as the low energy states of condensed matter systems. Using the Bravyi-Kitaev magic state distillation protocol, we find that non-local magic is distillable and can improve the distillation outcome. We analyze a few explicit examples and show that spin squeezing can be used to convert non-distillable states into distillable ones. Our analysis also suggests that the conventional product input states assumed by magic distillation protocols are extremely atypical among general states with distillable magic. It further justifies the need for studying a diverse range of entangled inputs that yield magic states with high probability.
description: 19 pages, 9 figures, 2 appendices