cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Electric-field-tunable valley Zeeman effect in bilayer graphene heterostructures: Realization of the spin-orbit valve effect
Creators: name: Tiwari, Priya
name: Srivastav, Saurabh Kumar
name: Bid, Aveek
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report the discovery of electric-field-induced transition from a topologically trivial to a topologically nontrivial band structure in an atomically sharp heterostructure of bilayer graphene (BLG) and single-layer WSe2 per the theoretical predictions of Gmitra and Fabian [Phys. Rev. Lett. 119, 146401 (2017)]. Through detailed studies of the quantum correction to the conductance in the BLG, we establish that the band-structure evolution arises from an interplay between proximity-induced strong spin-orbit interaction (SOI) and the layer polarizability in BLG. The low-energy carriers in the BLG experience an effective valley Zeeman SOI that is completely gate tunable to the extent that it can be switched on or off by applying a transverse displacement field or can be controllably transferred between the valence and the conduction band. We demonstrate that this results in the evolution from weak localization to weak antilocalization at a constant electronic density as the net displacement field is tuned from a positive to a negative value with a concomitant SOI-induced splitting of the low-energy bands of the BLG near the K (K') valley, which is a unique signature of the theoretically predicted spin-orbit valve effect. Our analysis shows that quantum correction to the Drude conductance in Dirac materials with strong induced SOI can only be explained satisfactorily by a theory that accounts for the SOI-induced spin splitting of the BLG low-energy bands. Our results demonstrate the potential for achieving highly tunable devices based on the valley Zeeman effect in dual-gated two-dimensional materials.
description: 5 pages, 5 figures
title: Salmon Rivers On The Kola Peninsula. Some Results Of Acclimation Of Pink Salmon (Oncorynchus Gorbusha (WAlbaum))
Creators: name: Zubchenko, A.V.
name: Popov, N.G.
name: Svenning, M.A.
Publisher: name: ASC 1998 - N
Year: 2024
Subjects: Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.Showing no particular diversity of ichthyofauna reservoirs over the Kola peninsula have always been renowned for valuable species of fish of which Atlantic salmon has occupied and still does a special place. However, compared to other species its abundance has never been high. For example, yearly catch of Atlantic salmon in this region in the period from 1950 to 1997 was only slightly above 600 t even in the best years (625 tin 1965), i.e. hundreds of times less than the catch of the Far East salmon.
title: Modele Comportemental Des Civelles D' Anguille (Anguilla Anguilla L.) Dans L'Estuaire De L'Adour
Creators: name: Bru, N.
name: De Casamajor, M.-N.
name: Albert, E.
name: Prouzet, P.
name: Sanchez, F.
name: Lazure, P.
Publisher: name: ASC 1998 - N
Year: 2024
Subjects: Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.L'objectif du travail expose ici est une modelisation du comportement des flux de civelles d'Anguille (Anguilla anguilla L.) dans l'estuaire de l'Adour au cours de differentes saisons de peche. Cette etude est fondee sur des donnees de captures recueillies aupres des pecheurs professionnels de I' Adour et sur une experimentation de terrain. Grace a une etude bibliographique, nous pouvons preciser que le mode de deplacement des civelles depend fortement des variations de conditions environnementales. Des travaux anterieurs (Cf. Bru & al., 1998; de Casamajor & al., 1998) nous ont permis de definir que la temperature de l'eau est un facteur limitant I' accessibilite des civelles a la pecherie professionnelle. Un questionnaire soumis a un echantillon representatif de pecheurs professionnels a revele !'importance de la lumiere nocturne sur !es captures en surface. Notamment, ils nous ont signale que une periode de pleine lune etait synonyme de mauvaises prises.
Can a charged dust ball be sent through the Reissner--Nordström wormhole?
Creators: name: Krasiński, Andrzej
name: Bolejko, Krzysztof
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In a previous paper we formulated a set of necessary conditions for the spherically symmetric weakly charged dust to avoid Big Bang/Big Crunch, shell crossing and permanent central singularities. However, we did not discuss the properties of the energy density, some of which are surprising and seem not to have been known up to now. A singularity of infinite energy density does exist -- it is a point singularity situated on the world line of the center of symmetry. The condition that no mass shell collapses to $R = 0$ if it had $R > 0$ initially thus turns out to be still insufficient for avoiding a singularity. Moreover, at the singularity the energy density $ε$ is direction-dependent: $ε\to - \infty$ when we approach the singular point along a $t =$ const hypersurface and $ε\to + \infty$ when we approach that point along the center of symmetry. The appearance of negative-energy-density regions turns out to be inevitable. We discuss various aspects of this property of our configuration. We also show that a permanently pulsating configuration, with the period of pulsation independent of mass, is possible only if there exists a permanent central singularity.
description: 30 pages, 21 figures; several corrections after referee's comments, 4 figures modified
title: The Riverine, Estuarine And Coastal Migratory Behaviour Of Wild Atlantic Salmon (Salmo Sala,R L.) Smolts
Creators: name: Moore, A.
name: Russell, I.C.
name: Ives, M.
name: Ives, S.
name: Potter, E.C.E.
name: Waring, C.P.
Publisher: name: ASC 1998 - N
Year: 2024
Subjects: Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.The migratory behaviour of wild Atlantic sahnon Sa/mo salar (L.) smolts during their emigration from fresh water to the marine enviromnent has been studied in 4 river systems in England and Wales using acoustic telemetry. Smolts trapped in freshwater and implanted with miniature acoustic transmitters were monitored during their subsequent migrations through the river estuaries and into coastal waters. Migration in freshwater was predominantly nocturnal, although there was a seasonal change in this pattern with later run fish moving during both the day and night. Smolts tagged earlier in the studies spent significantly longer in the rivers before migrating into coastal waters than fish tagged later in the studies. The movement of smolts through the estuaries was indicative of a nocturnal selective ebb tide transport pattern of migration. All the smolts migrated seawards on an ebb tide close to the surface and within the fastest moving section of the water column. Smolt migration in the lower portion of the estuaries was indicative of active directed swimming and there. was no apparent period of acclimation required when moving from fresh to saltwater. Migration within coastal waters was again rapid within the upper water column and movement occurred during both day and night. There was a strong tidal component to the speed and direction of movement
Quantitative measurements of changes in DNA tertiary structures induced by physical and chemical agents
Creators: name: Hung, Yip-Chan Jacyln
Publisher: name: University of British Columbia
Year: 2010

description: When Chinese hamster V79 lung fibroblast cells are lysed in solution containing sodium chloride, a non-ionic detergent Triton-X-100, and the DNA intercalating dye propidium iodide, intact loops of DNA can be visualized under the fluorescence microscope as a 'halo' region surrounding the periphery of the nuclear matrix. The size of these halos has a biphasic dependence on the concentration of propidium iodide, suggesting that the DNA is organized into supercoiled loops constrained by attachments to the nuclear matrix. However, the induction of strand breaks in the loops of DNA by ionizing radiation results in loss of supercoiling and a uniform halo size regardless of the concentration of propidium iodide. The goal of this project was to use mathematical procedures and image processing techniques to measure the change in the size of the DNA halo. We suggest that such a quantitative assay will provide a fast and objective means to directly measure the effect of physical and chemical agents on the DNA loops. The image acquisition, processing, and segmentation procedures that are necessary for the development of this quantitative assay are performed with the Fluorescence Image Processing System (FIPS). A gradient-threshold algorithm is implemented to segment the image, which in this case is to separate the DNA halo from the background and nuclear matrix. Damage inflicted by two of the better characterized agents, x-radiation and platinum complexes, are used as a test system for this assay. The results reported here suggest that this assay can detect damage to the DNA loops at a radiation dose of as low as one Gray. The size of the DNA loop is calculated to be about 102µm. The biphasic dependence of the halo size on the concentration of propidium iodide is consistent with published data. Studies on the effect on platinum drugs on DNA loops show a difference in the kinetics of the unwinding and rewinding of the supercoils and the size of the halos at these phases also differ for both cis- and trans-diamminedichloro-platinum(II) treated cells. With our increased knowledge of the genome organization, an objective quantitative assay that can provide some insight to the damage and repair of DNA at the tertiary level of DNA organization should prove to be useful.
title: Spatial And Temporal Distribution Of Atlantic Salmon Post-Smolts In The Norwegian Sea And Adjacent Areas - Origin Of Fish, Age Structure And Relation To Hydrographical Conditions In The Sea
Creators: name: Holm, Marianne
name: Holst, Jens Christian
name: Hansen, Lars Petter
Publisher: name: ASC 1998 - N
Year: 2024
Subjects: Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.The aim of the investigations is to collect information on post-smolt ecology in the open ocean, a practically unnknown stage in the the life cycle of the salmon. The paper presents data from surface trawlhauls during cruises in the Norwegian Sea and adjacent areas in 1991 - 1998 where an area delineated by approximately 55°N, 11°W, 76°N; and 15°E has been covered during the summer cruises from June to August. A total of 380 trawl-hours have yielded 459 post-smolts. Although the short time series and limitations in the area covered still do not allow conclusions on distribution and density of smolts in these feeding areas, a distribution pattern with high likelihood of smolt captures can be distinguished. The highest incidence of post􀄂smolt-catches is found in the southern survey area following the slope current northward along the Thomson Wyville ridge, between the Shetland - Faroes and spreading fan- like over an area covering most of the international waters between Norway's, Faroes' and Iceland's EEZ up to about 73°N. With the exception of 1997, when almost no smolts were caught in the northernmost areas even if catches in the southern survey-areas were similar or higher than the previous years. The fish are found in the warmer, saline Atlantic water, in a distribution very similar to the prevailing Atlantic and Norwegian Coastal current pattern. Scale readings show a dominance of I and 2 year smolts in all catches, indicating a mid-and south European origin of the fish. Recapture of Irish, Welsh and south English micro tagged smolts in the northern areas further support this assumption.
Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model
Creators: name: Roth, R.
name: Navratil, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We propose an importance truncation scheme for the no-core shell model, which enables converged calculations for nuclei well beyond the p-shell. It is based on an a priori measure for the importance of individual basis states constructed by means of many-body perturbation theory. Only the physically relevant states of the no-core model space are considered, which leads to a dramatic reduction of the basis dimension. We analyze the validity and efficiency of this truncation scheme using different realistic nucleon-nucleon interactions and compare to conventional no-core shell model calculations for 4He and 16O. Then, we present the first converged calculations for the ground state of 40Ca within no-core model spaces including up to 16\hbarΩ-excitations using realistic low-momentum interactions. The scheme is universal and can be easily applied to other quantum many-body problems.
description: 4 pages, 5 figures, 1 table
Αιμοδυναμικές και βιοχημικές μεταβολές μετά τη διαδερμική αντιμετώπιση βαλβιδοπαθειών
Creators: name: Χρυσοχέρης, Μιχαήλ Π.
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Διακαθετηριακή αντικατάσταση αορτικής βαλβίδας
Αορτική στένωση
Αιμοδυναμικές μεταβολές
Νεφρική λειτουργία
Βιοχημικοί δείκτες μυοκαρδιακής βλάβης
Εγκεφαλικό νατριουρητικό πεπτίδιο
Πτώση αιμοπεταλίων
Transcatheter aortic valve implantation (TAVI)
Aortic stenosis
Hemodynamic changes
Kidney function
Biochemical markers of myocardial injury
B Natriuretic peptide
Thrombocytopenia

description: Η διακαθετηριακή αντικατάσταση της αορτικής βαλβίδας για την αντιμετώπιση της σοβαρής αορτικής στένωσης αποτελεί επίτευγμα της σύγχρονης επεμβατικής καρδιολογίας. Η εμφύτευση βιοπροσθετικής αορτικής βαλβίδας σε πάλλουσα καρδιά είναι μοναδική, από άποψη παθοφυσιολογίας, κατάσταση. Σκοπός της διατριβής η περιγραφή των μεταβολών σε αιμοδυναμικές και βιοχημικές παραμέτρους που παρατηρούνται μετά την επιτυχή διαδερμική εμφύτευση αορτικής βαλβίδας. Ειδικότερα μελετήθηκαν με καθετήρα πνευμονικής αρτηρίας αιμοδυναμικές μεταβλητές πριν την εμφύτευση, και εν συνεχεία στις 6 ώρες και στις 24 ώρες μετά. Περαιτέρω μελετήθηκαν με καθετήρα εντός της αριστερής κοιλίας τα αιμοδυναμικά δεδομένα πριν και αμέσως μετά την εμφύτευση της βιοπρόθεσης. Σε ότι αφορά στις βιοχημικές εν γένει μεταβολές μελετήθηκαν (κατά τη διάρκεια της νοσηλείας) οι δείκτες της νεφρικής λειτουργίας, οι δείκτες μυοκαρδιακής βλάβης, οι μεταβολές στα νατριουρητικά πεπτίδια και οι μεταβολές στον αριθμό των αιμοπεταλίων.
description: The transcatheter aortic valve replacement for severe aortic stenosis is a major breakthrough in structural interventional cardiology. The implantation of an aortic bioprosthesis in the beating heart represents a unique state from a pathophysiology point of view. The aim of this dissertation was to describe the hemodynamic and biochemical changes observed after successful transcatheter aortic valve replacement. More specifically, with the use of a pulmonary artery catheter multiple hemodynamic variables were recorded before and at 6 and 24 hours post valve implantation. In addition, left ventricular hemodynamics were assessed before, and immediately after, successful implantation. Furthermore, during the index hospitalization, the impact on biochemical markers was also studied. These included markers of kidney function, markers of myocardial injury, changes in natriuretic peptides and finally changes in platelet counts.
Θεολογία και κινηματογράφος σε διάλογο: Το αίτημα της ετερότητας στην κινηματογραφική ποιητική του Θόδωρου Αγγελόπουλου
Creators: name: Χατζή, Διονυσία Β.
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Κινηματογράφος
Θόδωρος Αγγελόπουλος
Ετερότητα
Θεολογία - Θρησκεία
Αισθητική
Οντολογία
Cinema
Theo Angelopoulos
Otherness
Theology – Religion
Aesthetics
Ontology

description: Η διατριβή διερευνά ζητήματα διαλόγου και συσχετισμού θεολογίας και κινηματογράφου, θέματα ερμηνευτικής της ετερότητας και συνύπαρξης από την οπτική του θεολογικού στοχασμού και της κινηματογραφικής αναπαράστασης (οπτικοποίησης), εστιάζοντας στον τρόπο οπτικοποίησης της ετερότητας στην Τριλογία των συνόρων του Θόδωρου Αγγελόπουλου που περιλαμβάνει τις ταινίες Το μετέωρο βήμα του πελαργού, Το βλέμμα του Οδυσσέα και Μια αιωνιότητα και μια μέρα. Κύριο ζητούμενο είναι η θεολογική ανάγνωση της συγκεκριμένης τριλογίας και η ανάδειξη της σύνδεσης της κινηματογραφικής αποτύπωσης της εκτοπισμένης Ετερότητας με τον τρόπο που η Θεολογία του Προσώπου και της Μετανάστευσης κατανοούν και ερμηνεύουν τη διάνοιξη του Εαυτού στον Άλλο.
description: The thesis explores questions on the correlation and dialogue between the discipline of theology and the art of film, as well as the hermeneutics of otherness and co-existence from the perspectives of theological contemplation and cinematic representation (visualization). It focusses on the way otherness is represented in the director Theo Angelopoulos' cinematic trilogy (known as Trilogy of the Borders) that consists of the films "The Suspended Step of the Stork", "Ulysses’ Gaze" and "Eternity and a Day". The main aim is a theological reading of the Trilogy’s visual language and the revelation of the connection between this cinematic depiction of the displaced Otherness and the way that Theology of Personhood and Theology of Migration understand and interpret the openness of the Self to the Other.
Data Sources; Supplementary tables; Supplementary figures from Rebound in functional distinctiveness following warming and reduced fishing in the North Sea
Creators: name: Murgier, Juliette
name: McLean, Matthew
name: Maire, Anthony
name: Mouillot, David
name: Loiseau, Nicolas
name: Munoz, François
name: Violle, Cyrille
name: Auber, Arnaud
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Functionally distinct species (i.e. species with unique trait combinations in the community) can support important ecological roles and contribute disproportionately to ecosystem functioning. Yet, how functionally distinct species have responded to recent climate change and human exploitation has been widely overlooked. Here, using ecological traits and long-term fish data in the North Sea, we identified functionally distinct and functionally common species, and evaluated their spatial and temporal dynamics in relation to environmental variables and fishing pressure. Functionally distinct species were characterized by late sexual maturity, few, large offspring, and high parental care, many being sharks and skates that play critical roles in structuring food webs. Both functionally distinct and functionally common species increased in abundance as ocean temperatures warmed and fishing pressure decreased over the last three decades; however, functionally distinct species increased throughout the North Sea, but primarily in southern North Sea where fishing was historically most intense, indicating a rebound following fleet decommissioning and reduced harvesting. Yet, some of the most functionally distinct species are currently listed as threatened by the IUCN and considered highly vulnerable to fishing pressure. Alarmingly these species have not rebounded. This work highlights the relevance and potential of integrating functional distinctiveness into ecosystem management and conservation prioritization.
title: Migratory Behaviour Of Cultured Atlantic Salmon Smolts Released During Day Or Night
Creators: name: Holm, Marianne
name: Skilbrei, Ove T.
name: Ona, Egil
name: Huse, Ingvar
name: Jørstad, Knut E.
Publisher: name: ASC 1998 - N
Year: 2024
Subjects: Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.Within the framework of a large-scale sea ranching programme (PUSH; Programme for Encouragement of Sea Ranching), 55000 smolts, 1st generation offspring of wild parents from three regional rivers, were released in groups (5-7000 individuals) during day and night. The releases were carried out between 24 May and 13 June from net pens in a small marine bay on the west coast of the Sotra Island, SW-Norway. The day and night releases were surveyed by a Simrad EK echo sounder with a horizontally mounted transducer and divers. During the daytime releases, the smolts left the bay rapidly. Fast migrating schools were observed. The migration out of the bay was slower during night releases, 5-9 hours, and the smolts was more loosely organised. The migration in the sea therefore seem to be faster during daytime when the smolts school. The change in behaviour from day to night is similar to that of several other pelagic species.
Circular dielectric cavity and its deformations
Creators: name: Dubertrand, R.
name: Bogomolny, E.
name: Djellali, N.
name: Lebental, M.
name: Schmit, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The construction of perturbation series for slightly deformed dielectric circular cavity is discussed in details. The obtained formulae are checked on the example of cut disks. A good agreement is found with direct numerical simulations and far-field experiments.
description: 17 pages, 12 figures
Nano-patterning of surfaces by ion sputtering: Numerical study of the anisotropic damped Kuramoto-Sivashinsky equation
Creators: name: Vitral, E.
name: Walgraef, D.
name: Pontes, J.
name: Anjos, G. R.
name: Mangiavacchi, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Nonlinear models for pattern evolution by ion beam sputtering on a material surface present an ongoing opportunity for new numerical simulations. A numerical analysis of the evolution of preexisting patterns is proposed to investigate surface dynamics, based on a 2D anisotropic damped Kuramoto-Sivashinsky equation, with periodic boundary conditions. A finite-difference semi-implicit time splitting scheme is employed on the discretization of the governing equation. Simulations were conducted with realistic coefficients related to physical parameters (anisotropies, beam orientation, diffusion). The stability of the numerical scheme is analyzed with time step and grid spacing tests for the pattern evolution, and the Method of Manufactured Solutions has been used to verify the proposed scheme. Ripples and hexagonal patterns were obtained from a monomodal initial condition for certain values of the damping coefficient, while spatiotemporal chaos appeared for lower values. The anisotropy effects on pattern formation were studied, varying the angle of incidence of the ion beam with respect to the irradiated surface. Analytical discussions are based on linear and weakly nonlinear analysis.
SNO+: predictions from standard solar models and spin flavour precession
Creators: name: Picariello, Marco
name: Pulido, João
name: Andringa, S.
name: Barros, N. F.
name: Maneira, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Time variability of the solar neutrino flux especially in the low and intermediate energy sector remains an open question and, if it exists, it is likely to be originated from the magnetic moment transition from active to light sterile neutrinos at times of intense solar activity and magnetic field. We examine the prospects for the SNO+ experiment to address this important issue and to distinguish between the two classes of solar models which are currently identified as corresponding to a high (SSM I) and a low (SSM II) heavy element abundance. We also evaluate the predictions from these two models for the Chlorine experiment event rate in the standard LMA and LMA+Spin Flavour Precession (SFP) scenarios. It is found that after three years of SNO+ data taking, the pep flux measurement will be able to discriminate between the standard LMA and LMA+SFP scenarios, independently of which is the correct solar model. If the LMA rate is measured, SFP with $B_0 \sim 280kG$ for the resonant $Δm^2_{01}$ can be excluded at more than $4σ$. A low rate would signal new physics, excluding all the 90% allowed range of the standard LMA solution at 3$σ$, and a time variability would be a strong signature of the SFP model. The CNO fluxes are the ones for which the two SSM predictions exhibit the largest differences, so their measurement at SNO+ will be important to favour one or the other. The distinction will be clearer after LMA or SFP are confirmed with pep, but still, a CNO measurement at the level of SSM I/LMA will disfavour SSM II at about $3 σ$. We conclude that consistency between future pep and CNO flux measurements at SNO+ and Chlorine would either favour an LMA+SFP scenario or favour SSM II over SSM I.
description: 20 pages. Sections 1 and 2 extended, section 4.4 added, references added and updated. Final version to be published in JHEP
Data Sources; Supplementary tables; Supplementary figures from Rebound in functional distinctiveness following warming and reduced fishing in the North Sea
Creators: name: Murgier, Juliette
name: McLean, Matthew
name: Maire, Anthony
name: Mouillot, David
name: Loiseau, Nicolas
name: Munoz, François
name: Violle, Cyrille
name: Auber, Arnaud
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Functionally distinct species (i.e. species with unique trait combinations in the community) can support important ecological roles and contribute disproportionately to ecosystem functioning. Yet, how functionally distinct species have responded to recent climate change and human exploitation has been widely overlooked. Here, using ecological traits and long-term fish data in the North Sea, we identified functionally distinct and functionally common species, and evaluated their spatial and temporal dynamics in relation to environmental variables and fishing pressure. Functionally distinct species were characterized by late sexual maturity, few, large offspring, and high parental care, many being sharks and skates that play critical roles in structuring food webs. Both functionally distinct and functionally common species increased in abundance as ocean temperatures warmed and fishing pressure decreased over the last three decades; however, functionally distinct species increased throughout the North Sea, but primarily in southern North Sea where fishing was historically most intense, indicating a rebound following fleet decommissioning and reduced harvesting. Yet, some of the most functionally distinct species are currently listed as threatened by the IUCN and considered highly vulnerable to fishing pressure. Alarmingly these species have not rebounded. This work highlights the relevance and potential of integrating functional distinctiveness into ecosystem management and conservation prioritization.
The 1:+2 / 1:-2 resonance
Creators: name: Cushman, R. H.
name: Dullin, Holger R.
name: Hanßmann, Heinz
name: Schmidt, Sven
Publisher: name: arXiv
Year: 2007
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: On the linear level elliptic equilibria of Hamiltonian systems are mere superpositions of harmonic oscillators. Non-linear terms can produce instability, if the ratio of frequencies is rational and the Hamiltonian is indefinite. In this paper we study the frequency ratio 1/2 and its unfolding. In particular we show that for the indefinite case (1:-2) the frequency ratio map in a neighbourhood of the origin has a critical point, i.e. the twist condition is violated for one torus on every energy surface near the energy of the equilibrium. In contrast, we show that the frequency map itself is non-degenerate (i.e. the Kolmogorov non-degeneracy condition holds) for every torus in a neighbourhood of the equilibrium point. As a byproduct we are able to obtain another proof of fractional monodromy in the 1:-2 resonance.
description: 24 pages, 19 figures, corrected lemma 1 and 3
A sufficient condition for Gaussian departure in turbulence
Creators: name: Tordella, Daniela
name: Iovieno, Michele
name: Bailey, Peter Roger
Publisher: name: arXiv
Year: 2007
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The interaction of two isotropic turbulent fields of equal integral scale but different kinetic energy generates the simplest kind of inhomogeneous turbulent field. In this paper we present a numerical experiment where two time decaying isotropic fields of kinetic energies $E_1$ and $E_2$ initially match over a narrow region. Within this region the kinetic energy varies as a hyperbolic tangent. The following temporal evolution produces a shearless mixing. The anisotropy and intermittency of velocity and velocity derivative statistics is observed. In particular the asymptotic behavior in time and as a function of the energy ratio $E_1/E_2 \to \infty$ is discussed. This limit corresponds to the maximum observable turbulent energy gradient for a given $E_1$ and is obtained through the limit $E_2 \to 0$. A field with $E_1/E_2 \to \infty$ represents a mixing which could be observed near a surface subject to a very small velocity gradient separating two turbulent fields, one of which is nearly quiescent. In this condition the turbulent penetration is maximum and reaches a value equal to 1.2 times the nominal mixing layer width. The experiment shows that the presence of a turbulent energy gradient is sufficient for the appearance of intermittency and that during the mixing process the pressure transport is not negligible with respect to the turbulent velocity transport. These findings may open the way to the hypothesis that the presence of a gradient of turbulent energy is the minimal requirement for Gaussian departure in turbulence.
description: 11 pages, 10 figures, To appear in Physical Review E
Monte Carlo calculations of Curie temperatures of Y$_{1-x}$Gd$_x$(Fe$_{1-y}$Co$_y$)$_2$ pseudobinary system
Creators: name: Wasilewski, Bartosz
name: Werwiński, Mirosław
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The close-packed AB$_2$ structures called Laves phases constitute the largest group of intermetallic compounds. In this paper we computationally investigated the pseudo-binary Laves phase system Y$_{1-x}$Gd$_x$(Fe$_{1-y}$Co$_y$)$_2$ spanning between the YFe$_2$, YCo$_2$, GdFe$_2$, and GdCo$_2$ vertices. While the vast majority of the Y$_{1-x}$Gd$_x$(Fe$_{1-y}$Co$_y$)$_2$ phase diagram is the ferrimagnetic phase, YCo$_2$ along with a narrow range of concentrations around it is the paramagnetic phase. We presented results obtained by Monte Carlo simulations of the Heisenberg model with parameters derived from first-principles calculations. For calculations, we used the Uppsala atomistic spin dynamics (UppASD) code together with the spin-polarized relativistic Korringa-Kohn-Rostoker (SPR-KKR) code. From first principles we calculated the magnetic moments and exchange integrals for the considered pseudo-binary system, together with spin-polarized densities of states for boundary compositions. Furthermore, we showed how the compensation point with the effective zero total moment depends on the concentration in the considered ferrimagnetic phases. However, the main result of our study was the determination of the Curie temperature dependence for the system Y$_{1-x}$Gd$_x$(Fe$_{1-y}$Co$_y$)$_2$. Except for the paramagnetic region around YCo$_2$, the predicted temperatures were in good qualitative and quantitative agreement with experimental results, which confirmed the ability of the method to predict magnetic transition temperatures for systems containing up to three different magnetic elements (Fe, Co, and Gd) simultaneously. For the Y(Fe$_{1-y}$Co$_y$)$_2$ and Gd(Fe$_{1-y}$Co$_y$)$_2$ systems our calculations matched the experimentally-confirmed Slater-Pauling-like behavior of T$_C$ dependence on the Co concentration.
description: 6 pages, 6 figures, conference: Physics of Magnetism 2021, Pozna\'n, Poland
title: Movements Of Young Striped Bass Out Of The Hudson River In Relation To Age, Length, And Abundance
Creators: name: Waldman, John R.
name: Dunning, Dennis J.
name: Mattson, Mark T.
Publisher: name: ASC 1998 - N
Year: 2024
Subjects: Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.We investigated the relationship between the abundance of young striped bass Marone saxatilis of the Hudson River and their age- and size-related dispersion outside of the river. Results from a standardized recruitment index showed that between 1985 and 1990, the Hudson River experienced record low recruitment of striped bass, followed by record high recruitment, and ending with moderately high recruitment.
Kinematic analysis of the 3-RPR parallel manipulator
Creators: name: Chablat, Damien
name: Wenger, Philippe
name: Bonev, Ilian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The aim of this paper is the kinematic study of a 3-RPR planar parallel manipulator where the three fixed revolute joints are actuated. The direct and inverse kinematic problem as well as the singular configuration is characterized. On parallel singular configurations, the motion produce by the mobile platform can be compared to the Reuleaux straight-line mechanism.
Quantum Lifetime of Two-Dimensional Holes
Creators: name: Eisenstein, J. P.
name: Syphers, D.
name: Pfeiffer, L. N.
name: West, K. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The quantum lifetime of two-dimensional holes in a GaAs/AlGaAs double quantum well is determined via tunneling spectroscopy. At low temperatures the lifetime is limited by impurity scattering but at higher temperatures hole-hole Coulomb scattering dominates. Our results are consistent with Fermi liquid theory, at least up to r_s = 11. At the highest temperatures the measured width of the hole spectral function becomes comparable to the Fermi energy. A new, tunneling-spectroscopic, method for determining the in-plane effective mass of the holes is also demonstrated.
description: 5 pages, 4 figures. Published version
Relation of Curie temperature and conductivity: (Ga,Mn)As alloy as a case study
Creators: name: Kudrnovsky, J.
name: Bouzerar, G.
name: Turek, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Experimental investigations of diluted magnetic semiconductors indicate a strong relation between Curie temperature and conductivity. Both quantities depend non trivially on the concentration of magnetic impurities, the carrier density, and the presence of compensating defects. We calculate both Curie temperature and conductivity of (Ga,Mn)As alloys in a selfconsistent manner based on the same first principles Hamiltonian in which the presence of compensating defects is taken into account. The effect of As-antisites and Mn-interstitials is determined separately and a good agreement between theory and experiment exists only in the case where the dominating mechanism of is due to the Mn-interstitials.
description: The manuscript is accepted for publication in APL
title: Low back pain: diagnosis and treatment
title: Les lombalgies : diagnostic et traitement
Creators: name: Bennani, Fatima Ezzahra
Publisher: name: Revue Marocaine de Rhumatologie (RMR)
Year: 2023
Subjects: Lombalgie; Drapeaux rouges; Rééducation.

description: Low back pain is pain of the lumbar spine. There are two types: common low back pain and symptomatic low back pain. Common low back pain accounts for 95% of all low back pain and is most often of disc origin or related to osteoarthritis. Symptomatic low back pain is secondary to a non-degenerative lesion and often develops progressively in association with general signs. “Red flags” are warning signs that must be looked for in all cases of low back pain in order to rule out a secondary cause, such as tumour, infection or inflammation, before making the diagnosis of common low back pain. Symptomatic low back pain is treated etiologically, whereas common low back pain is treated with painkillers and rehabilitation.
description: Les lombalgies sont des douleurs du rachis lombaire. On  distingue deux types : les lombalgies communes et les lombalgies symptomatiques. Les lombalgies communes représentent 95% des lombalgies et sont le plus souvent d’origine discale ou en rapport avec l’arthrose. Les lombalgies symptomatiques sont secondaires à une lésion non dégénérative et évoluent souvent de façon progressive en association avec des signes généraux. Les « drapeaux rouges » sont des signaux d’alarme qui doivent impérativement être recherchés devant toute lombalgie afin d’éliminer une cause secondaire pouvant être tumorale, infectieuse ou inflammatoire avant de retenir le diagnostic d’une lombalgie commune. Le traitement des lombalgies symptomatiques est étiologique tandis que les  lombalgies communes, leur traitement est à base  d’antalgiques et de rééducation.
Additional file 1 of Concomitant elevated serum levels of tenascin, MMP-9 and YKL-40, suggest ongoing remodeling of the heart up to 3 months after cardiac surgery after normalization of the revascularization markers
Creators: name: Liu, Da
name: Ghani, Danyal
name: Wain, Justin
name: Szeto, Wilson Y.
name: Laudanski, Krzysztof
Publisher: name: figshare
Year: 2022
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer

description: Additional file 1: Differences at preoperative CCL-28 levels in three pre-existing conditions.
Observational signatures of cosmic ray interactions in molecular clouds
Creators: name: Owen, Ellis R.
name: On, Alvina Y. L.
name: Lai, Shih-Ping
name: Wu, Kinwah
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We investigate ionization and heating of gas in the dense, shielded clumps/cores of molecular clouds bathed by an influx of energetic, charged cosmic rays (CRs). These molecular clouds have complex structures, with substantial variation in their physical properties over a wide range of length scales. The propagation and distribution of the CRs is thus regulated accordingly, in particular, by the magnetic fields threaded through the clouds and into the dense regions within. We have found that a specific heating rate reaching $10^{-26}$ erg cm$^{-3}$ s$^{-1}$ can be sustained in the dense clumps/cores for Galactic environments, and this rate increases with CR energy density. The propagation of CRs and heating rates in some star-forming filaments identified in IC 5146 are calculated, with the CR diffusion coefficients in these structures determined from magnetic field fluctuations inferred from optical and near-infrared polarizations of starlight, which is presumably a magnetic-field tracer. Our calculations indicate that CR heating can vary by nearly three orders of magnitude between different filaments within a cloud due to different levels of CR penetration. The CR ionization rate among these filaments is similar. The equilibrium temperature that could be maintained by CR heating alone is of order $1~{\rm K}$ in a Galactic environment, but this value would be higher in strongly star-forming environments, thus causing an increase in the Jeans mass of their molecular clouds.
description: 31 pages, 13 figures, 3 tables. Accepted for publication in ApJ
Surface anchoring of nematic liquid crystals
Creators: name: Gleeson, James Theodore
Publisher: name: University of British Columbia
Year: 2010

description: The surface anchoring of the nematic liquid crystal 5CB aligned tangentially on two different glass substrate treatments is studied. These two treatments are obliquely evaporated SiO and buffed poly(vinyl formal) deposited from solution. The latter is believed to be a new treatment and of possible importance to the twisted nematic liquid crystal display industry. Two methods are employed to measure the strength of the surface anchoring potential. The first was originally developed by Yokoyama and van Sprang, and yields the coefficient of the Rapini-Papoular anchoring potential. The second is a new method based on the Frank-Oseen elasticity theory. It is an extension of Deuling's 1972 solution of the splay Freedericksz transition. The second yields the functional form of the anchoring potential. Both methods are based on measurements of the bulk dielectric constant and the effective refractive index of a nematic sample that has undergone a splay Freedericksz transition. The first method requires both these measurements, and the second requires one or the other; both can be employed as a verification of results. The latter method is found to be very sensitive to the value of the dielectric anisotropy; this is believed to be due to not allowing for spatial variations in the scalar order parameter.
Magnetic properties of sputtered CoCr films and magneto-optics of rare earth-transition metal multilayers
Creators: name: Li, Zhanming
Publisher: name: University of British Columbia
Year: 2010

description: The goal of the thesis is to make contributions to the development of two new technologies for data storage: perpendicular recording and magneto-optic recording. CoCr and rare earth-transition metal multilayers are the most suitable media for perpendicular recording and magneto-optic recording technologies, respectively. In part A of the thesis, magnetic properties of CoCr thin films produced by dc magnetron sputtering are studied for various deposition conditions. Dielectric constants and extraordinary Hall effect are also studied to provide information complementary to magnetic properties. In part B, new methods are developed for theoretical analysis of the magneto-optics of rare earth-transition metal multilayers, which can be used to optimize the readout of the recording system. Part A For dc magnetron sputtered CoCr films the perpendicular and parallel magnetic coercivities are found to be mainly controlled by the substrate temperature during film growth. Substrate temperatures between 180 and 300 C are necessary to fabricate CoCr thin films for recording media. Films produced in this manner have magnetic anisotropy constants ranging from —1.0 to +0.5 10⁶erg/cc. The magnetic anisotropy has a complicated dependence on a large number of deposition parameters and can be best controlled by the dc sputtering power and the target-to-substrate distance. Based on microstructural analysis film properties are interpreted in terms of the adatom diffusion during film growth. It is found that high adatom mobility and low deposition rate promote positive magnetic anisotropy. The dielectric constants measured by ellipsometry are found to depend on the film thickness because of the change in film morphology during film growth. The effects of asymmetric sputtering are analyzed, and the relationship between the extraordinary Hall effect and the magnetic properties is investigated. Part B The 4x4 matrix method proposed by Lin-Chung and Teitler[P. J. Lin-Chung and S. Teitler, J. Opt. Soc. Am. A 1 703(1984)] is applied to the magneto-optics of the rare earth-transition metal multilayer system. Based on a plane wave model, the above method enables one to calculate the sensitivity of the readout to the layer thicknesses as well as effects of oblique angle of incidence, anisotropy in the nonmagnetic part of the dielectric constants and misalignment of the magnetization. Finally, an improved model is presented to take into account the fact that the reading laser is a strongly focused beam instead of a plane wave. This new model is used to optimize the magneto-optic multilayer system. When the focal spot size of the reading laser beam is less than about three wavelengths, significantly different results are obtained from the focused beam and the plane wave models.
title: Accidental Catches At Sea Of An Endangered Migratory Species, The European Sturgeon (Acipenser Sturio L.), And Connections With Various Types Of Fishing
Creators: name: Lepage, M.
name: Le Barh, R.
name: Rochard, E.
Publisher: name: ASC 1998 - N
Year: 2024
Subjects: Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.The European sturgeon (Acipenser sturio) is a diadromous fish that received a protected status in France in 1982. A total of 2 287 individuals had been tagged in the Gironde estuary since 1984 and several incidental captures of sturgeons tagged (n= 137) and untagged (n=59) have been reported by sea fishermen. The data collected from the voluntary declarations of capture vary considerably in both detail and quality, but the information gathered over a period of fifteen years highlights the types of fishing implicated in the capture of sturgeons at sea. Most of these fish were caught in three types of fishing gear : the bottom trawl (20%), the trammel net (34%) and the gill net (42%). Total number of individuals caught from 1982 to 1997 is estimated to 450, of which 57% died after capture. A survey was conducted among fishing management bodies in France in order to estimate the number of vessels involved in the different types of fishing and to establish their distribution along the coast. This survey helps to target information campaigns more effectively and thereby to improve the protection of the species through a better knowledge of fishermen whose practices are most likely to induce captures and incidental mortalities of sturgeons.
$WZ$ Production at $eγ$ Colliders and Anomalous Quartic $WWZγ$ Coupling
Creators: name: Sahin, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the constraints on the anomalous quartic $W^{+}W^{-}Zγ$ gauge boson coupling through the process $e^{-}γ\to ν_{e}W^{-}Z$. Considering incoming beam polarizations and the longitudinal and transverse polarization states of the final W and Z boson we find 95% confidence level limits on the anomalous coupling parameter $a_{n}$ with an integrated luminosity of 500 $fb^{-1}$ and $\sqrt{s}$=0.5, 1 TeV energies. We show that initial beam and final state polarizations improve the sensitivity to the anomalous coupling by up to factors of 2 - 3.5 depending on the energy.
description: published version
Vacuum Radiation in $z=2$ Lifshitz QED
Creators: name: Bufalo, R.
name: Bufalo, T. Cardoso e
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss in this paper the vacuum Cherenkov radiation in the $z=2$ Lifshitz electrodynamics. The improved ultraviolet behavior, in terms of higher spatial derivatives, and the renormalizable couplings, due to the time-space anisotropic scaling, present in the Lifshitz setting are extremely important in fulfilling the physical constraints in order to this vacuum process to happen. We evaluate in details the instantaneous rate of energy loss for a charge, and also analyze the emission of very soft photons in this framework.
description: 16 pages, 1 figure, accepted for publication PRD