cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Suppressed Magnetization at the Surfaces and Interfaces of Ferromagnetic Metallic Manganites
Creators: name: Freeland, J. W.
name: Kavich, J. J.
name: Gray, K. E.
name: Ozyuzer, L.
name: Zheng, H.
name: Mitchell, J. F.
name: Warusawithana, M. P.
name: Ryan, P.
name: Zhai, X.
name: Kodama, R. H.
name: Eckstein, J. N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: What happens to ferromagnetism at the surfaces and interfaces of manganites? With the competition between charge, spin, and orbital degrees of freedom, it is not surprising that the surface behavior may be profoundly different than that of the bulk. Using a powerful combination of two surface probes, tunneling and polarized x-ray interactions, this paper reviews our work on the nature of the electronic and magnetic states at manganite surfaces and interfaces. The general observation is that ferromagnetism is not the lowest energy state at the surface or interface, which results in a suppression or even loss of ferromagnetic order at the surface. Two cases will be discussed ranging from the surface of the quasi-2D bilayer manganite (La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$) to the 3D Perovskite (La$_{2/3}$Sr$_{1/3}$MnO$_3$)/SrTiO$_3$ interface. For the bilayer manganite, that is, ferromagnetic and conducting in the bulk, these probes present clear evidence for an intrinsic insulating non-ferromagnetic surface layer atop adjacent subsurface layers that display the full bulk magnetization. This abrupt intrinsic magnetic interface is attributed to the weak inter-bilayer coupling native to these quasi-two-dimensional materials. This is in marked contrast to the non-layered manganite system (La$_{2/3}$Sr$_{1/3}$MnO$_3$/SrTiO$_3$), whose magnetization near the interface is less than half the bulk value at low temperatures and decreases with increasing temperature at a faster rate than the bulk.
description: 15 pages, 13 figures
Like Attract Like? A Structural Comparison of Homogamy across Same-Sex and Different-Sex Households
Creators: name: Ciscato, Edoardo
name: Galichon, Alfred
name: Goussé, Marion
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Economics (econ.GN)
subject: FOS: Economics and business

description: In this paper, we extend Gary Becker's empirical analysis of the marriage market to same-sex couples. Becker's theory rationalizes the well-known phenomenon of homogamy among different-sex couples: individuals mate with their likes because many characteristics, such as education, consumption behaviour, desire to nurture children, religion, etc., exhibit strong complementarities in the household production function. However, because of asymmetries in the distributions of male and female characteristics, men and women may need to marry "up" or "down" according to the relative shortage of their characteristics among the populations of men and women. Yet, among same-sex couples, this limitation does not exist as partners are drawn from the same population, and thus the theory of assortative mating would boldly predict that individuals will choose a partner with nearly identical characteristics. Empirical evidence suggests a very different picture: a robust stylized fact is that the correlation of the characteristics is in fact weaker among same-sex couples. In this paper, we build an equilibrium model of same-sex marriage market which allows for straightforward identification of the gains to marriage. We estimate the model with 2008-2012 ACS data on California and show that positive assortative mating is weaker for homosexuals than for heterosexuals with respect to age and race. Our results suggest that positive assortative mating with respect to education is stronger among lesbians, and not significantly different when comparing gay men and married different-sex couples. As regards labor market outcomes, such as hourly wages and working hours, we find some indications that the process of specialization within the household mainly applies to different-sex couples.
description: 48 pages, 8 tables
Built environment education : a feminist critique and reconstruction
Creators: name: Avery, Hinda H.
Publisher: name: University of British Columbia
Year: 2008

description: This dissertation examines the relationship between built environment education and the discourse which focuses on women in the built environment. It critiques the major built environment education programs in Britain, the United States and Canada, from a feminist art teacher's perspective, showing, with one minor exception, that the spatial and structural needs of women are not taken into account; it presents an overview of the literature concerning women in the built environment; and finally, it demonstrates how community-based women-centred initiatives and issues, as documented in the literature, can, and should be incorporated into built environment elementary and secondary school programs. The principal argument of this dissertation is that the built environment exists predominantly as the expression of an ensconced and inequitable social order. As such, the built environment has resulted, and continues to result in the oppression and subordination of women. By not including the spatial and structural needs of women, within a community-based curriculum, and thereby denying the special circumstances of female students, most built environment education programs reproduce and entrench these exclusionary practices.
Casimir effect for concentric spheres in de Sitter spacetime with signature change
Creators: name: Darabi, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We revisit the Casimir effect for two concentric spherical shells in de Sitter background with a new geometric configuration, namely Euclidean signature between and Lorentzian signature outside the spheres with different cosmological constants, for a massless scalar field satisfying Dirichlet boundary conditions on the spheres. It is shown that an extra constant pressure emerges due to this signature changing configuration. Some interesting aspects of this extra term are then discussed.
description: 11 pages, no figures, accepted for publication in IJTP
QISHLOQ XO'JALIGI IQTISODIYOTIDA LOGISTIKA TIZIMINI TASHKIL QILISH
Creators: name: Toshtemirov, Shaxboz
Publisher: name: Zenodo
Year: 2024

description: Jahonda yuz berayotgan globallashuv hamda vertikal integratsiya jarayonlarining avj olishida transport-logistika faoliyatining ahamiyati tobora ortib bormoqda.
Signals from the Noise: Image Stacking for Quasars in the FIRST Survey
Creators: name: White, Richard L.
name: Helfand, David J.
name: Becker, Robert H.
name: Glikman, Eilat
name: deVries, Wim
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a technique to explore the radio sky into the nanoJansky regime by employing image stacking using the FIRST survey. We first discuss the non-intuitive relationship between the mean and median values of a distribution that is dominated by noise, followed by an analysis of the systematic effects present in FIRST's 20cm VLA snapshot images. Image stacking allows us to recover the properties of source populations with fluxes a factor of 30 or more below the rms noise level. Mean estimates of radio flux density, luminosity, etc., are derivable for any source class having arcsecond positional accuracy. We use this technique to compute the mean radio properties for 41,295 quasars from the SDSS DR3 catalog. There is a tight correlation between optical and radio luminosity, with the radio luminosity increasing as the 0.85 power of optical luminosity. This implies declining radio-loudness with optical luminosity: the most luminous objects (M=-28.5) have average radio-to-optical ratios 3 times lower than the least luminous objects (M=-20). There is also a striking correlation between optical color and radio loudness: quasars that are either redder or bluer than the norm are brighter radio sources, with objects 0.8 magnitudes redder than the SDSS composite spectrum having radio-loudness ratios that are higher by a factor of 10. We explore the longstanding question of whether a radio-loud/radio-quiet dichotomy exists in quasars, finding that optical selection effects probably dominate the distribution function of radio loudness, which has at most a modest (~20%) inflection between the radio-loud and radio-quiet ends of the distribution. We also find, surprisingly, that broad absorption line quasars have higher mean radio flux densities, with the greatest disparity arising in the rare low-ionization BAL subclass.
description: 17 pages, 19 figures, accepted by ApJ; corrected error in absolute magnitudes
Non-Clifford gate on optical qubits by nonlinear feedforward
Creators: name: Konno, Shunya
name: Asavanant, Warit
name: Fukui, Kosuke
name: Sakaguchi, Atsushi
name: Hanamura, Fumiya
name: Marek, Petr
name: Filip, Radim
name: Yoshikawa, Jun-ichi
name: Furusawa, Akira
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a continuous-variable optical system, the Gottesman-Kitaev-Preskill (GKP) qubit is a promising candidate for fault-tolerant quantum computation. To implement non-Clifford operations on GKP qubits, non-Gaussian operations are required. In this context, the implementation of a cubic phase gate by combining nonlinear feedforward with ancillary states has been widely researched. Recently, however, it is pointed out that the cubic phase gate is not the most suitable for non-Clifford operations on GKP qubits. In this work, we show that we can achieve linear optical implementation of non-Clifford operations on GKP qubit with high fidelity by applying the nonlinear feedforward originally developed for the cubic phase gate and using a GKP-encoded ancillary state. Our work shows the versatility of nonlinear feedforward technique important for optical implementation of the fault-tolerant continuous-variable quantum computation.
description: 11 pages, 5 figures
Bilingualism in a functional perspective : the language and content learning of immigrant entrepreneurs
Creators: name: Wong, Alice S.P.
Publisher: name: University of British Columbia
Year: 2008

description: This is a case study of the academic and occupational discourse of immigrant entrepreneurs in a bilingual (Cantonese and English) business and language program which aims to relate the linguistic and managerial knowledge acquired in class to the business operations. This case study raises problematic questions for both LSP (Language for Specific Purposes) research and bilingual code-switching research. There were two purposes: (1) to study the functional variation of discourse in the educational program and the operation of small business; and (2) to investigate the importance of the functional variation of discourse in code-switching. Pursuing purpose one, part one of the study explores two models: an LSP approach based on "genre" and learning tasks(Swales, 1990); and the Language Socialization approach (Halliday,1975; Mohan, 1986; Ochs, 1988) viewing language learning and sociocultural learning as occurring simultaneously in "activities"(social practices or situations). Two issues are raised: (1) Data indicate that the LSP approach does not illuminate the relation between academic discourse and occupational discourse; (2) It does not account for specific connections between tasks in classroom discourse and genres in business practices. The Language Socialisation approach, however, points to important dynamic theory/practice relations which appear in contrasts between business rules and examples, language rules and examples, seminar discourse and workshop discourse, and the English class and service encounter discourse. Pursuing purpose two, part two of the study compares the Language Socialization model with two models of code-switching as it relates to functional variation of discourse: (1) Guthrie (1983), and (2) Faerch (1985). Model (1) misses a large proportion of second language examples while model (2) fails to account for data labelled as "business rules" and "business examples" in the sample. The Language Socialization approach, however, recognises in discourse both theory (e.g., language and business rules) and practice (e.g., language and business examples). Rules are mostly handled in the first language while examples are mostly handled in the second language. A log-linear analysis indicates that, in all cases, "rules/ examples" is the strongest predictor of language choice.
Kerr-Schild metrics in teleparallel gravity
Creators: name: Fröb, Markus B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that the Kerr-Schild ansatz can be extended from the metric to the tetrad, and then to teleparallel gravity where curvature vanishes but torsion does not. We derive the equations of motion for the Kerr-Schild null vector, and describe the solution for a rotating black hole in this framework. It is shown that the solution depends on the chosen tetrad in a non-trivial way if the spin connection is fixed to be the one of the flat background spacetime. We show furthermore that any Kerr-Schild solution with a flat background is also a solution of $f(\mathcal{T})$ gravity.
description: 11 pages, matches published version
Dal teatro alla letteratura medica Eleonora Duse paziente illustre
Creators: name: Pagani, Maria Pia
Publisher: name: Università degli Studi di Milano
Year: 2015

description: Al Vittoriale, nella Biblioteca privata di Gabriele d’Annunzio, sono conservate due pubblicazioni di letteratura medica su Eleonora Duse realizzate dai dottori Gino Ravà e Felice Santori. Entrambe uscite negli Anni Trenta, riportano episodi poco noti della vita personale e clinica della famosa attrice, e sono accomunate dalla descrizione del suo lavoro artistico in relazione ai problemi di salute – specie quelli che minavano il sistema nervoso e le risorse vocali – contro i quali ha lottato per tutta la vita.
description: ENTHYMEMA, No 12 (2015)
Alopias vulpinus
Creators: name: Spear, Luka N.
name: Kohin, Suzanne
name: Mohan, John A.
name: David Wells, R. J.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Elasmobranchii
Lamniformes
Alopiidae
Alopias
Alopias vulpinus

description: 3.1 | Tagged and recaptured OTC-marked A. vulpinus
For the 14 A. vulpinus included in this study, average time at liberty was 2.14 years (±0.97 years SD), ranging from 1.08 to 3.81 years. All were juveniles (Natanson et al., 2016; Natanson & Gervelis, 2013) with an average 101 cm LF (± 13.42 cm SD) at tagging. Study animals for whom a recapture length was provided (n = 9) averaged 137 cm LF (± 18.47 cm SD) at recapture (Table 1).
3.2 | Age validation
We found no systematic age bias (p> 0.05) in all comparisons for POTC and POBB counts (χ 2 -tests of symmetry; Figure 4). Variability among reader counts across all three readers was lower after the BB with an APE of 7.32%, and an ACV of 9.51%, compared to an APE of 10.70% and an ACV of 14.00% for POTC counts. Among readers, all final band pair counts after the OTC were within one band pair of each other, and 93% (13 of 14) of the counts after the BB were within one band pair (Table 1). The slopes of the linear regression analysis conducted for each reader ranged from 0.84 to 0.94 (95% confidence intervals ranging from 0.43 to 1.36, Table 2; Figure 5), and were not significantly different from each other based on an F -test (F = 0.3275, p = 0.8054). The goodness of fit of the linear relationships ranged from 0.60 to 0.76 (Table 2; Figure 5), which indicates that the model explains 60% – 76% of the variability in the data around its mean, respectively.
description: Published as part of Spear, Luka N., Kohin, Suzanne, Mohan, John A. & David Wells, R. J., 2024, Insights into vertebral band pair deposition rate in the juvenile common thresher shark (Alopias vulpinus) in the northeastern Pacific Ocean, pp. 104-112 in Journal of Fish Biology 104 (1) on page 109, DOI: 10.1111/jfb.15538, http://zenodo.org/record/10981420
Lorenzo Marchese, L’io possibile. L’autofiction come paradosso del romanzo contemporaneo
Creators: name: Raccis, Giacomo
Publisher: name: Università degli Studi di Milano
Year: 2015

description: Recensiamo Lorenzo Marchese, L’io possibile. L’autofiction come paradosso del romanzo contemporaneo, Transeuropa, Massa 2014.
description: ENTHYMEMA, No 12 (2015)
Global Iterative Sliding Mode Control of an Industrial Biaxial Gantry System for Contouring Motion Tasks
Creators: name: Wang, Wenxin
name: Ma, Jun
name: Cheng, Zilong
name: Li, Xiaocong
name: de Silva, Clarence W
name: Lee, Tong Heng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper proposes a global iterative sliding mode control approach for high-precision contouring tasks of a flexure-linked biaxial gantry system. For such high-precision contouring tasks, it is the typical situation that the involved multi-axis cooperation is one of the most challenging problems. As also would be inevitably encountered, various factors render the multi-axis cooperation rather difficult; such as the strong coupling (which naturally brings nonlinearity) between different axes due to its mechanical structure, the backlash and deadzone caused by the friction, and the difficulties in system identification, etc. To overcome the above-mentioned issues, this work investigates an intelligent model-free contouring control method for such a multi-axis motion stage. Essentially in the methodology developed here, it is firstly ensured that all the coupling, friction, nonlinearity, and disturbance (regarded as uncertain dynamics in each axis) are suitably posed as `uncertainties'. Then, a varying-gain sliding mode control method is proposed to adaptively compensate for the matched unknown dynamics in the time domain, while an iterative learning law is applied to suppress the undesirable effects (arising from the repetitive matched and unmatched uncertainties in the iteration domain). With this approach, the chattering that typically results from the overestimated control gains in the sliding mode control is thus suppressed during the iterations. To analyze the contouring performance and show the improved outcomes, rigorous proof is furnished on both the stability in the time domain and the convergence in the iteration domain; and the real-time experiments also illustrate that the requirements of precision motion control towards high-speed and complex-curvature references can be satisfied using the proposed method, without prior knowledge of the boundary to the unknown dynamics.
description: 11 pages, 8 figures
The interplay of fast waves and slow convection in geodynamo simulations nearing Earth's core conditions
Creators: name: Aubert, Julien
name: Gillet, Nicolas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Ground observatory and satellite-based determinations of temporal variations in the geomagnetic field probe a decadal to annual time scale range where Earth's core slow, inertialess convective motions and rapidly propagating, inertia-bearing hydromagnetic waves are in interplay. Here we numerically model and jointly investigate these two important features with the help of a geodynamo simulation that (to date) is the closest to the dynamical regime of Earth's core. This model also considerably enlarges the scope of a previous asymptotic scaling analysis. Three classes of hydrodynamic and hydromagnetic waves are identified in the model output, all with propagation velocity largely exceeding that of convective advection: axisymmetric, geostrophic Alfvén torsional waves, and non-axisymmetric, quasi-geostrophic Alfvén and Rossby waves. The contribution of these waves to the geomagnetic acceleration amounts to an enrichment and flattening of its energy density spectral profile at decadal time scales, thereby providing a constraint on the extent of the $f^{-4}$ range observed in the geomagnetic frequency power spectrum. The flow and magnetic acceleration energies carried by waves both linearly increase with the ratio of the magnetic diffusion time scale to the Alfvén time scale, highlighting the dominance of Alfvén waves in the signal and the stabilising control of magnetic dissipation at non-axisymmetric scales. Extrapolation of the results to Earth's core conditions supports the detectability of Alfvén waves in geomagnetic observations, either as axisymmetric torsional oscillations or through the geomagnetic jerks caused by non-axisymmetric waves. In contrast, Rossby waves appear to be too fast and carry too little magnetic energy to be detectable in geomagnetic acceleration signals of limited spatio-temporal resolution.
description: 40 pages, 11 figures
On the light glueball spectrum in a holographic description of QCD
Creators: name: Colangelo, P.
name: De Fazio, F.
name: Jugeau, F.
name: Nicotri, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the spectra of light scalar and vector glueballs in a holografic description of QCD with a dilaton background bulk field. In particular, we study how the glueball masses depend on the conditions on the dilaton background and on the geometry of the bulk.
description: LaTex, 13 pages, 2 figures
Ποιητικές ανιχνεύσεις στη σύγχρονη ελληνική ποίηση (ποιητές/ποιήτριες γεννημένοι/ες από το 1975 έως το 1995) τη δεκαετία της κρίσης (2008-2018)
Creators: name: Πολυματίδου, Ελένη Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Σύγχρονη ελληνική ποίηση
Νέοι ποιητές
Κρίση
Contemporary greek poetry
Young poets
Crisis

description: Σκοπός της διατριβής ήταν η αναζήτηση και η παρουσίαση της ποιητικής παραγωγής στη σύγχρονη ελληνική ποίηση τη δεκαετία της κρίσης (2008-2018) όπως την αφουγκράζονται και την προσλαμβάνουν οι νέοι σε ηλικία ποιητές (25-45 ετών οι ποιητές και οι ποιήτριες που συμπεριελήφθησαν τα ποιήματα τους) με κύριο άξονα τα ποιήματα που σχετίζονταν άμεσα ή έμμεσα με κοινωνικοπολιτικά ζητήματα (όπως μετανάστευση/προσφυγικό, ανεργία, διάθεση αλλαγής και επανάστασης, αίσθημα αποξένωσης, ήττας, απογοήτευσης ή ελπίδας για το μέλλον κ.α.). Εξετάστηκαν τα γενικά χαρακτηριστικά που παρουσιάζει η σύγχρονη ελληνική ποίηση τη δεκαετία της κρίσης και στη συνέχεια τα ποιήματα ομαδοποιήθηκαν σε κατηγορίες ανάλογα με το θέμα (μετανάστευση, ανεργία κτλ.) που αφορούσαν και αναλύθηκαν ως προς τη μορφή και το περιεχόμενο.
description: The aim of the present thesis was the search and the presentation of the poetic production in the contemporary Greek poetry during the decade of the crisis (2008-2018) as it was perceived by the young poets (the poets are 25-45 years old whose poems have been included) with basic orientation the poems which were related to the social-political issues (like immigration, unemployment, intention to change and to revolt, feeling of alienation, defeat, disappointment or hope for the future etc). Τhe general characteristics of the contemporary Greek poetry during the decade of the crisis were examined and then the poems were grouped in categories according to the specific issue (immigration, unemployment etc) that they concerned and were analysed in relation to their form and meaning.
Cibo e scrittura nei romanzi di Stefano Benni
Creators: name: Nava, Francesca
Publisher: name: Università degli Studi di Milano
Year: 2015

description: Nella sua carriera ormai quarantennale, Stefano Benni ha pubblicato un gran numero di testi tra loro profondamente differenti: essi risultano difficilmente analizzabili per la complessità che li caratterizza, non tanto qualitativa quanto più quantitativa poiché incentrata sul meccanismo retorico dell’adiectio. Pare dunque utile affrontare i testi dell’autore adottando una prospettiva di tipo intertestuale, che trova la sua massima manifestazione concreta nella frequente reiterazione della tematica del cibo. Partendo da questo presupposto, è possibile intraprendere un’analisi testuale dei romanzi, incentrata sull’aspetto stilistico e organizzata in prospettiva funzionalista che permetta di comprendere i diversi usi che vengono fatti del cibo all’interno delle opere dell’autore: spunto creativo per la fantasia dell’autore, indicatore sociale, elemento metaforico, strumento per definire le caratteristiche dei personaggi.
 In his nearly forty-year-career, Stefano Benni published a large number of works, each of which is both deeply different from one another: all of them are hardly analyzable for their complexity not so much from a quality as from a quantity point of view, because his whole framework is based on the rhetorical device of adiectio. Therefore, it is very useful to analyze the author's works with an intertextual perspective, whose peak is represented by the food theme. Starting from this assumption, it is possible to undertake a textual analysis of his novels, both focused on stylistic features and organized according to a functional standpoint which allows to understand the different uses of the food in the author’s novels: a hint for the author’s imagination, a social pointer, a metaphor, a frame to the characters’ qualities.
description: ENTHYMEMA, No 12 (2015)
Three-dimensional bipedal model with zero-energy-cost walking
Creators: name: Pankov, Sergey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Robotics (cs.RO)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We study a three-dimensional articulated rigid-body biped model that possesses zero cost of transport walking gaits. Energy losses are avoided due to the complete elimination of the foot-ground collisions by the concerted oscillatory motion of the model's parts. The model consists of two parts connected via a universal joint. It does not rely on any geometry altering mechanisms, massless parts or springs. Despite the model's simplicity, its collisionless gaits feature walking with finite speed, foot clearance and ground friction. The collisionless spectrum can be studied analytically in the small movement limit, revealing infinitely many periodic modes. The modes differ in the number of sagittal and coronal plane oscillations at different stages of the walking cycle. We focus on the mode with the minimal number of such oscillations, presenting its complete analytical solution. We then numerically evolve it toward a general non-small movement solution. A general collisionless mode can be tuned by adjusting a single model parameter. Some of the presented results display a surprising degree of generality and universality.
description: 20 pages, 7 figures
Oscillations of MHD shock waves on the surfaces of T Tauri stars
Creators: name: Koldoba, A. V.
name: Ustyugova, G. V.
name: Romanova, M. M.
name: Lovelace, R. V. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This work treats the matter deceleration in a magnetohydrodynamics radiative shock wave at the surface of a star. The problem is relevant to classical T Tauri stars where infalling matter is channeled along the star's magnetic field and stopped in the dense layers of photosphere. A significant new aspect of the present work is that the magnetic field has an arbitrary angle with respect to the normal to the star's surface. We consider the limit where the magnetic field at the surface of the star is not very strong in the sense that the inflow is super Alfvénic. In this limit the initial deceleration and heating of plasma (at the entrance to the cooling zone) occurs in a fast magnetohydrodynamic shock wave. To calculate the intensity of radiative losses we use "real" and "power-law" radiative functions. We determine the stability/instability of the radiative shock wave as a function of parameters of the incoming flow: velocity, strength of the magnetic field, and its inclination to the surface of the star. In a number of simulation runs with the "real" radiative function, we find a simple criterion for stability of the radiative shock wave. For a wide range of parameters, the periods of oscillation of the shock wave are of the order 0.02-0.2 sec.
description: 13 pages, 11 figures, submitted to the MNRAS after revision, see animations at http://www.astro.cornell.edu/us-rus/shock.htm
Facilitating the implementation and adaptation of data-centric teaching resources by closing gaps in the Open Education Resource (OER) lifecycle
Creators: name: Bonner, Kaitlin
name: Fleming-Davies, Arietta
name: Grayson, Kristine
name: Wu, Ben
name: Hernández-Pacheco, Raisa
Publisher: name: QUBES Educational Resources
Year: 2019

description: Presentation on data-centric open educational resources given at the 2019 UBER-GRC
Outflows from the high-mass protostars NGC 7538 IRS1/2 observed with bispectrum speckle interferometry -- Signatures of flow precession
Creators: name: Kraus, S.
name: Balega, Y.
name: Elitzur, M.
name: Hofmann, K. -H.
name: Preibisch, Th.
name: Rosen, A.
name: Schertl, D.
name: Weigelt, G.
name: Young, E. T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: NGC 7538 IRS1 is a high-mass (approx. 30 M_sun) protostar with a CO outflow, an associated UCHII region, and a linear methanol maser structure, which might trace a Keplerian-rotating circumstellar disk. The directions of the various associated axes are misaligned with each other. We investigate the near-infrared morphology of the source to clarify the relations among the various axes. K'-band bispectrum speckle interferometry was performed at two 6-meter-class telescopes -- the BTA 6m telescope and the 6.5m MMT. Complementary IRAC images from the Spitzer Space Telescope Archive were used to relate the structures detected with the outflow at larger scales. High-dynamic range images show fan-shaped outflow structure in which we detect 18 stars and several blobs of diffuse emission. We interpret the misalignment of various outflow axes in the context of a disk precession model, including numerical hydrodynamic simulations of the molecular emission. The precession period is approx. 280 years and its half-opening angle is 40 degrees. A possible triggering mechanism is non-coplanar tidal interaction of an (undiscovered) close companion with the circumbinary protostellar disk. Our observations resolve the nearby massive protostar NGC 7538 IRS2 as a close binary with separation of 195 mas. We find indications for shock interaction between the outflow activities in IRS1 and IRS2. Indications of outflow precession have been discovered to date in a number of massive protostars, all with large precession angles 20--45 degrees. This might explain the difference between the outflow widths in low- and high-mass stars and add support to a common collimation mechanism.
description: 20 pages; 8 figures; Accepted by A&A on April 10, 2006; Image quality reduced due to astro-ph file size limitations; Please download a version with high-quality images from http://www.mpifr-bonn.mpg.de/staff/tpreibis/ngc7538.pdf
Spin drag and fast response in a quantum mixture of atomic gases
Creators: name: Carlini, Federico
name: Stringari, Sandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: By applying a sudden perturbation to one of the components of a mixture of two quantum fluids, we explore the effect on the motion of the second component on a short time scale. By implementing perturbation theory, we prove that for short times the response of the second component is fixed by the energy weighted moment of the crossed dynamic structure factor (crossed f-sum rule). We also show that by properly monitoring the time duration of the perturbation it is possible to identify peculiar fast spin drag regimes, which are sensitive to the interaction effects in the Hamiltonian. Special focus is given to the case of coherently coupled Bose-Einstein condensates, interacting Bose mixtures exhibiting the Andreev-Bashkin effect, normal Fermi liquids and the polaron problem. The relevant excitations of the system contributing to the spin drag effect are identified and the contribution of the low frequency gapless excitations to the f-sum rule in the density and spin channels is explicitly calculated employing the proper macroscopic dynamic theories. Both spatially periodic and Galilean boost perturbations are considered.
description: 11 pages, 2 figure
Zeeman ratchets for ballistic spin currents
Creators: name: Scheid, Matthias
name: Wimmer, Michael
name: Bercioux, Dario
name: Richter, Klaus
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the possiblity of creating directed spin-polarized currents in a two-dimensional electron gas (2DEG) subject to an asymmetric magnetic field and an external adiabatic driving. We thereby generalize concepts of quantum charge ratchets to the case with spin. Due to the Zeeman term in the Hamiltonian, spin-up and -down electrons experience different effective potentials, which can be tailored to achieve net spin currents without corresponding charge currents. We consider ballistic, coherent transport in waveguides defined in a 2DEG, where the magnetic field modulation is induced by ferromagnetic stripes on top of the 2DEG.
description: 4 pages, 4 figures, accepted for publication in physica status solidi (c) (2006)
Peithó o del modo imperativo. Una nota su Carlo Michelstaedter e Gianni Carchia
Creators: name: Carmello, Marco
Publisher: name: Università degli Studi di Milano
Year: 2015

description: The aim of this article is to analyze the interpretation of Carlo Michelstaedter’s thought defined by Gianni Carchia. Discussing the Carchia’s approach to Michelstaedter’s philosophy, we will show up some problematic points, like the relation between language and rhetoric or that between life and being. Cloncluding, we will try to define the complex hermenutical relation which Gianni Carchia maintains with the Michelstaedter’s text.

Lo scopo del presente articolo è quello di analizzare l’interpretazione del pensiero di Carlo Michelsatedter offerta da Gianni Carchia. Discutendo l’approccio di carchia alla filosofia di Michelstaedter, sottolineeremo alcuni passaggi problematici, come la relazione fra lingua e retorica o quella fra vita ed essere. In conclusione, cercheremo di definire la complessa relazione ermeneutica che Gianni carchia intrattiene col testo di Michelstaedter
description: ENTHYMEMA, No 12 (2015)
«Il piccolo vascello solca i mari». Tommaso Landolfi e i suoi editori. Bibliografia degli scritti di e su Landolfi (1929-2006)
Creators: name: Roccella, Paola
Publisher: name: Università degli Studi di Milano
Year: 2015

description: Recensiamo il volume «Il piccolo vascello solca i mari». Tommaso Landolfi e i suoi editori. Bibliografia degli scritti di e su Landolfi (1929-2006) a cura di Idolina Landolfi. Firenze: Cadmo, 2015.
description: ENTHYMEMA, No 12 (2015)
Dissipationless Vector Drag--Superfluid Spin Hall Effect
Creators: name: Syrwid, Andrzej
name: Blomquist, Emil
name: Babaev, Egor
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Dissipationless flows in single-component superfluids have a significant degree of universality. In He4, the dissipationless mass flow occurs with a superfluid velocity determined by the gradient of the superfluid phase. However, in interacting superfluid mixtures, principally new effects appear. In this Letter, we demonstrate a new kind of dissipationless phenomenon arising in mixtures of interacting bosons in optical lattices. We point out that for a particular class of optical lattices, bosons condense in a state where one of the components' superflow results in dissipationless mass flow of the other component, in a direction different from either of the components' superfluid velocities. The free-energy density of these systems contains a vector product-like interaction of superfluid velocities, producing the dissipationless noncollinear entrainment. The effect represents a superfluid counterpart of the Spin Hall effect.
description: 4 pages, 3 figures and supplemental material; version accepted for publication in Phys. Rev. Lett
Ο Μητροπολίτης Χαλκίδος Γρηγόριος Ε΄ Πλειαθός (1922-1968), ο Επίσκοπος της αγάπης
Creators: name: Κωνσταντινάκη, Βασιλική Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Γρηγόριος Ε΄ Πλειαθός
Πρόσφυγες
Εβραίοι
Κατοχή
Εμφύλιος
Δικτατορία
Gregorius V Pleiathos
Refugees
Hebrews
Occupation
Civil war
Dictatorship

description: Η συγκεκριμένη μελέτη ασχολείται με το έργο και την προσφορά στον άνθρωπο ενός φωτισμένου Επισκόπου. Ο Μητροπολίτης Γρηγόριος Ε΄ ο Πλειαθός (1922-68) υπήρξε κατά την άποψή μας ένας από τους σπουδαιότερους Ιεράρχες της Εκκλησίας της Ελλάδας. Σε όλη τη διάρκεια της Αρχιερατείας του διακόνησε, αυτός ο σπουδαίος Ιεράρχης χωρίς θρησκευτικό φανατισμό και μισαλλοδοξία. Έβλεπε με το ίδιο βλέμμα, το βλέμμα της γνήσιας Χριστιανικής αγάπης, όλους τους ανθρώπους ανεξαρτήτως της θρησκευτικής πίστεως και άλλης διακρίσεως, δίνοντας σε όλους την αγάπη του και την αμέριστη προστασία και βοήθεια του
description: The present study deals with the work and the contribution to humans of an enlightened Bishop. Archibishop Gregorius V Pleiathos (1922-1968) was in our view one to the greatest Hierarchs of the Church of Greece. During his prelacy, he served without religious fanaticism and bigotry. He viewed all people, irrespective of their religious beliefs and other differences, with pure Christian love, giving everyone all of his love and unreserved protection and help
La guerra del Gaddus
Creators: name: Cenati, Giuliano
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: Gadda; Grande Guerra; Giornale; scrittura dell’io; memorialistica

description: I diari di guerra gaddiani sono un documento memorialistico notevole sotto vari profili: biografico, storico, antropologico e anche letterario. Partito per il fronte della Grande Guerra con la baldanza dell’interventista figlio di buona famiglia, il giovane autore vi registra il tracciato di una crisi esistenziale in cui si rispecchia la stessa crisi nazionale italiana, attraverso la disfatta di Caporetto e l’esperienza annichilente della cattività germanica. Referto analitico, meticoloso, ossessivo della propria vicenda psicologica e militare, l’annotazione frastagliata di Gadda ora si inarca verso la contemplazione tragica di alti ideali disattesi ora inclina alla contraffazione umoristica del vissuto. Il risentimento etico-civile e il grottesco pluristilistico del futuro narratore sono davvero enucleati lungo la scrittura del Giornale di guerra e di prigionia, che si viene configurando come inopinato laboratorio di composizione letteraria e in pari tempo lacerante regesto di aberrazioni sociopolitiche.
description: ENTHYMEMA, No 12 (2015)
Stories and songs
Creators: name: Lewington, Anna
name: , Avelino
name: , Candela
name: , María
name: , Paulina
name: Simón
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: mcb

description: Corresponds to portions of original Tape 2, Side B (not donated). Contents are (1 in Ticumpinia, 2-3 in Timpia): 1) Woman talking in Matsigenka, recounting the origin of manioc myth; 2) Simón talking then singing in Matsigenka; 3) another 21 songs sung in Matsigenka by Simón, Paulina, María, and Candela (Matsigenka girls) and Avelino, mostly about manioc beer (Sp. masato).
Signature change, vacuum condensation and cosmological constant
Creators: name: Darabi, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We proposes an alternative model of duality symmetry, based on the previously obtained divergence theory, including an scalar field, an internal vector and a metric signature. At some small scale an effective scalar field equation has appeared whose potential acts like a Higgs one, where the metric signature plays the role of an order parameter. Non-vanishing Vacuum condensation of this Higgs field occurs once a signature change from Euclidean to Lorentzian is formed. The mass scale of Higgs field excitations around this vacuum may contribute, in the Lorentzian sector, to the cosmological constant, in agreement with observations.
description: 13 pages, minor revision
title: Μία πολυκριτήρια προσέγγιση για την αξιολόγηση των χρηματοοικονομικών επιδόσεων των επιχειρήσεων στον κλάδο της αυτοκινητοβιομηχανίας
title: A multicriteria approach for the evaluation of the financial performance of automotive manufacturers
Creators: name: Κουτσογιαννης Σπυριδων
Publisher: name: Technical University of Crete
Year: 2024

description: Ο τομέας της αυτοκινητοβιομηχανίας αποτελεί καθοριστικό παράγοντα  της βιομηχανικής ανάπτυξης, οδηγώντας την οικονομική και την τεχνολογική πρόοδο σε παγκόσμιο επίπεδο. Ωστόσο, αντιμετωπίζει πιεστικές προκλήσεις όπως η μεταστροφή προς τη βιωσιμότητα μέσω της πράσινης μετάβασης και της ηλεκτροκίνησης. Η παρούσα διπλωματική, επικεντρώνεται στην αξιολόγηση των χρηματοοικονομικών επιδόσεων και δεδομένων των κατασκευαστών αυτοκινήτων και την ενσωμάτωση περιβαλλοντικών, κοινωνικών και διακυβερνητικών παραγόντων (ESG) με τη χρήση μεθόδων πολυκριτηριακής ανάλυσης. Συνδυάζοντας χρηματοοικονομικές μετρήσεις με ζητήματα βιωσιμότητας, η εργασία αποσκοπεί στην παροχή μιας ολοκληρωμένης αξιολόγησης της οικονομικής κατάστασης και των πρακτικών βιωσιμότητας του κλάδου.
description: The automotive sector is a key factor of industrial development, driving economic and technological progress worldwide. However, it faces pressing challenges such as the shift towards sustainability through the green transition and electrification. This thesis, focuses on evaluating the financial performance and data of automotive manufacturers and integrating environmental, social and governance (ESG) factors using multi-criteria analysis methods. By combining financial metrics with sustainability issues, the paper aims to provide a comprehensive assessment of the industry's financial situation and sustainability practices.
First demonstration of early warning gravitational wave alerts
Creators: name: Magee, Ryan
name: Chatterjee, Deep
name: Singer, Leo P.
name: Sachdev, Surabhi
name: Kovalam, Manoj
name: Mo, Geoffrey
name: Anderson, Stuart
name: Brady, Patrick
name: Brockill, Patrick
name: Cannon, Kipp
name: Canton, Tito Dal
name: Chu, Qi
name: Clearwater, Patrick
name: Codoreanu, Alex
name: Drago, Marco
name: Godwin, Patrick
name: Ghosh, Shaon
name: Greco, Giuseppe
name: Hanna, Chad
name: Kapadia, Shasvath J.
name: Katsavounidis, Erik
name: Oloworaran, Victor
name: Pace, Alexander E.
name: Panther, Fiona
name: Patwary, Anwarul
name: De Pietri, Roberto
name: Piotrzkowski, Brandon
name: Prestegard, Tanner
name: Rei, Luca
name: Sreekumar, Anala K.
name: Szczepańczyk, Marek J.
name: Valsan, Vinaya
name: Viets, Aaron
name: Wade, Madeline
name: Wen, Linqing
name: Zweizig, John
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Gravitational-wave observations became commonplace in Advanced LIGO-Virgo's recently concluded third observing run. 56 non-retracted candidates were identified and publicly announced in near real time. Gravitational waves from binary neutron star mergers, however, remain of special interest since they can be precursors to high-energy astrophysical phenomena like $γ$-ray bursts and kilonovae. While late-time electromagnetic emissions provide important information about the astrophysical processes within, the prompt emission along with gravitational waves uniquely reveals the extreme matter and gravity during - and in the seconds following - merger. Rapid communication of source location and properties from the gravitational-wave data is crucial to facilitate multi-messenger follow-up of such sources. This is especially enabled if the partner facilities are forewarned via an early-warning (pre-merger) alert. Here we describe the commissioning and performance of such a low-latency infrastructure within LIGO-Virgo. We present results from an end-to-end mock data challenge that detects binary neutron star mergers and alerts partner facilities before merger. We set expectations for these alerts in future observing runs.
Solid state quantum memory using the 31P nuclear spin
Creators: name: Morton, John J. L.
name: Tyryshkin, Alexei M.
name: Brown, Richard M.
name: Shankar, Shyam
name: Lovett, Brendon W.
name: Ardavan, Arzhang
name: Schenkel, Thomas
name: Haller, Eugene E.
name: Ager, Joel W.
name: Lyon, S. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The transfer of information between different physical forms is a central theme in communication and computation, for example between processing entities and memory. Nowhere is this more crucial than in quantum computation, where great effort must be taken to protect the integrity of a fragile quantum bit. Nuclear spins are known to benefit from long coherence times compared to electron spins, but are slow to manipulate and suffer from weak thermal polarisation. A powerful model for quantum computation is thus one in which electron spins are used for processing and readout while nuclear spins are used for storage. Here we demonstrate the coherent transfer of a superposition state in an electron spin 'processing' qubit to a nuclear spin 'memory' qubit, using a combination of microwave and radiofrequency pulses applied to 31P donors in an isotopically pure 28Si crystal. The electron spin state can be stored in the nuclear spin on a timescale that is long compared with the electron decoherence time and then coherently transferred back to the electron spin, thus demonstrating the 31P nuclear spin as a solid-state quantum memory. The overall store/readout fidelity is about 90%, attributed to systematic imperfections in radiofrequency pulses which can be improved through the use of composite pulses. We apply dynamic decoupling to protect the nuclear spin quantum memory element from sources of decoherence. The coherence lifetime of the quantum memory element is found to exceed one second at 5.5K.
description: v2: Tomography added and storage of general initial states
Hopscotching Jellyfish: combining different duty cycle kinematics can lead to enhanced swimming performance
Creators: name: Baldwin, Tierney
name: Battista, Nicholas A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences
subject: 76Z10, 74F10, 92B99

description: Jellyfish (Medusozoa) have been deemed the most energy-efficient animals in the world. Their bell morphology and relatively simple nervous systems make them attractive to robotocists. Although, the science community has devoted much attention to understanding their swimming performance, there is still much to be learned about the jet propulsive locomotive gait displayed by prolate jellyfish. Traditionally, computational scientists have assumed uniform duty cycle kinematics when computationally modeling jellyfish locomotion. In this study we used fluid-structure interaction modeling to determine possible enhancements in performance from shuffling different duty cycles together across multiple Reynolds numbers and contraction frequencies. Increases in speed and reductions in cost of transport were observed as high as 80% and 50%, respectively. Generally, the net effects were greater for cases involving lower contraction frequencies. Overall, robust duty cycle combinations were determined that led to enhanced or impeded performance.
description: 53 pages; 26 figures