cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Magnetic nanostructures functionalized with a derived lysine coating applied to simultaneously remove heavy metal pollutants from environmental systems
Creators: name: Plohl, Olivija
name: Simonič, Marjana
name: Kolar, Ken
name: Gyergyek, Sašo
name: Zemljič, Lidija Fras
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: The pollution of environmental systems with heavy metals is becoming a serious problem worldwide. These contaminants are one of the main issues in sludge (which is considered waste) and can even have harmful effects if the sludge is not treated properly. Thus, the development of a novel functional magnetic nanoadsorbent based on a derived lysine is reported here, which can be efficiently applied for metal removal from sludge. Magnetic nanoparticles were coated with silica layer and further modified by covalent bonding of derived lysine. The morphology of the nanomaterial, its nano-size and the silica layer thickness were analyzed by transmission electron microscopy. The successful silanization of the lysine derivative to the silica-coated magnetic nanostructures was investigated by several physicochemical characterization techniques, while the magnetic properties were measured with a vibrating sample magnetometer. The synthesized nanostructures were used as adsorbents for simultaneous removal of most critical heavy metals (Cr, Zn, Cu) from real complex sludge suspensions. The main practical adsorption parameters, pH of the native stabilized sludge, adsorbent amount, time, and adsorbent regeneration were investigated. The results show promising adsorption properties among currently available adsorbents (the total equilibrium adsorption capacity was 24.5 mg/g) from the sludge with satisfactory nanoadsorbent reusability and its rapid removal. The stability of the nanoadsorbent in the sludge, an important but often neglected practical parameter for efficient removal, was verified. This work opens up new possibilities for the development of high-quality magnetic nanoadsorbents for metal pollutants applied in various complicated environmental fields and enables waste recovery.
Mutual Mobile Membranes with Timers
Creators: name: Aman, Bogdan
name: Ciobanu, Gabriel
Publisher: name: arXiv
Year: 2009
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: A feature of current membrane systems is the fact that objects and membranes are persistent. However, this is not true in the real world. In fact, cells and intracellular proteins have a well-defined lifetime. Inspired from these biological facts, we define a model of systems of mobile membranes in which each membrane and each object has a timer representing their lifetime. We show that systems of mutual mobile membranes with and without timers have the same computational power. An encoding of timed safe mobile ambients into systems of mutual mobile membranes with timers offers a relationship between two formalisms used in describing biological systems.
US-RSE: Envisioning the  Next Stage and Defining Next Steps
Creators: name: Gesing, Sandra
Publisher: name: Zenodo
Year: 2023

description: On December 13, 2023, Sandra Gesing, Executive Director in the US Research Software Engineers Association (US-RSE) and Senior Researcher at the San Diego Supercomputer Center gave her talk on US-RSE: Envisioning the Next Stage and Defining Next Steps.

Abstract: US-RSE has had a lot of momentum and positive energy from the beginning in 2017. It gained even more in the last couple of months evident in the rising numbers of members growing to over 2100 and the sold out inaugural conference in Chicago. The grant of the Sloan foundation allows for the first time that staff members can complement the volunteer effort: Sandra Gesing as the Executive Director at 50% and a soon-to-be-announced full-time community manager. These roles will take US-RSE to the next level beyond volunteer work. One of the goal is the creation of non-traditional career paths for RSEs that are lacking in the academic and national lab world. The seminar will go into Sandra’s vision for the role of the executive director to achieve financial sustainability for US-RSE, community activities and major tasks for the next couple of months.
Solvothermally synthesized anatase TiO2 nanoparticles for photoanodes in dye-sensitized solar cells
Creators: name: Attafi, Kadhim
name: Nattestad, Andrew
name: Qutaish, Hamzeh
name: Park, Min-Sik
name: Shrestha, Lok Kumar
name: Ariga, Katsuhiko
name: Dou, Shi Xue
name: Kim, Jung Ho
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Developmental Biology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Many researchers working on the development of Dye-sensitized solar cells (DSCs) continue to focus on the synthesis of photoanode materials with high surface area, along with high light scattering ability to enhance light harvesting efficiency (LHE). On the other hand, dye packing density, which can also affect the LHE significantly, is often overlooked. Solvothermally synthesized anatase TiO2 nanoparticles (SANP) were obtained by a new and simple approach using a mixed solvent, ethanol and acetic acid. SANP were applied as a photoanodes material in DSCs using a metal-free organic dye (D149) or organometallic dye (N719) dyes. The dye loading (packing density) was examined in term of the isoelectric point (IEP) and the contribution of this, in addition to light scattering effects were shown to control the devices photovoltaic efficiency of the devices; specifically when compared with ones employing commercially available TiO2 nanoparticles (either transparent or a bilayer structure with a transparent layer and a scattering one). SANP photoanodes sensitized with D149 dye were found to be optimised at 10 µm, yielding photovoltaic conversion efficiencies of 6.9%, superior to for transparent or transparent + scattering films from the commercial source (5.6% and 5.9%, respectively). Further to this, an efficiency of 7.7% PCE was achieved using a SANP photoanode sensitized with N719 dye, with 7.2% seen for the transparent photoanode and 7.9% with a scattering layer. The high efficiencies of devices based on of SANP photoanode are attributed to the high dye loading capability in addition to good light scattering. A further point of interest is that even with the increased reactivity of the surface towards dye adsorption, we did not observe any significant increase in recombination with the redox mediator, presumably due to this increased dye loading providing better shielding.
Los as redemptive agent in the prophecies of William Blake
Creators: name: Macmillan, Sybil
Publisher: name: University of British Columbia
Year: 2011

description: In the prophecies of William Blake, the chief agent in bringing about the Apocalyptic restoration of fallen man is the poet-prophet Los. In The Songs of Innocence and of Experience, the poet-prophet appears as the Bard who calls the lapsed soul to return to Innocence, the state of integrated vision. In the minor prophecies, as Blake moves into the fragmented mind of the individual in the state of Experience to show us the movement back to the integrated vision of Innocence, the poet-prophet emerges as Los. He is uncertain of his role, since Blake has not yet granted him the guiding influence of the inspiration of Jesus. With The Four Zoas comes the first complete statement of the myth of the fall and resurrection of man, represented by Albion, and with this myth comes the definition of the role of Los as the part of Albion who retains more of the Divine Vision than any of the other Zoas. At the crucial point in the myth of the fall, Jesus inspires Los, who then begins to build redemptive works of art amid the chaos, although, finally, restoration of Albion is not achieved in this poem. In Milton, the final movement toward Apocalypse begins. Although much of the poem deals with the appearance of the historical poet-prophet, Milton, within the mythic world of Los, the redemptive work proceeds as Los, with his family, builds Golgonooza, the city of art, as well as redemptive forms for the Spectres of the Dead, those formless abstractions which exist in a disordered mind. Jerusalem is a presentation of the Apocalyptic reunion of Albion and completes the movement begun in Milton. In this final prophecy, Los never doubts the Divine Vision of Jesus, and having subdued his Spectre, he works toward the resurrection with all his arts. Through Los, inspired as he is by Jesus, Albion achieves renewed vision and all the Zoas return to their rightful positions within him. His work done, Los returns to the Mental Warfare of Eternity in the form of Urthona, his equivalent within the resurrected Albion. Man, fallen from Innocence, is restored to Innocence through the work of one of the parts of his mind.
Super-diffusion around the rigidity transition: Levy and the Lilliputians
Creators: name: Lechenault, F.
name: Candelier, R.
name: Dauchot, O.
name: Bouchaud, J. P.
name: Biroli, G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: By analyzing the displacement statistics of an assembly of horizontally vibrated bidisperse frictional grains in the vicinity of the jamming transition experimentally studied before, we establish that their superdiffusive motion is a genuine Levy flight, but with `jump' size very small compared to the diameter of the grains. The vibration induces a broad distribution of jumps that are random in time, but correlated in space, and that can be interpreted as micro-crack events at all scales. As the volume fraction departs from the critical jamming density, this distribution is truncated at a smaller and smaller jump size, inducing a crossover towards standard diffusive motion at long times. This interpretation contrasts with the idea of temporally persistent, spatially correlated currents and raises new issues regarding the analysis of the dynamics in terms of vibrational modes.
description: 7 pages, 6 figures
Approximation diophantienne et approximants de Hermite-Padé de type I de fonctions exponentielles
Creators: name: Khémira, Samy
name: Voutier, Paul
Publisher: name: arXiv
Year: 2010
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11J82

description: En utilisant des approximants de Hermite-Padé de fonctions exponentielles, ainsi que des déterminants d'interpolation de Laurent, nous minorons la distance entre un nombre algébrique et l'exponentielle d'un nombre algébrique non nul. ----- We use Hermite-Padé approximants of exponential functions along with Laurent's interpolation determinants to obtain lower bounds for the distance between an algebraic number and the exponential of another non-zero algebraic number.
description: accepted in Annales des sciences math\'ematiques du Qu\'ebec (special issue dedicated to Paulo Ribenboim)
Electronic supplementary information ;Mass spectrum;Crystal data from Developing a fast and catalyst-free protocol to form C=N double bond with high functional group tolerance
Creators: name: Zhong, Bin
name: Chen, Feng
name: Ge, Yushu
name: Liu, Dan
Publisher: name: The Royal Society
Year: 2023

description: general information, experimental details, characterization data for products, and NMR spectra of products. ;Mass spectrometry data of products; Single crystal X-ray structure of 11 and 89
Dynamical mean field theory of an effective three-band model for Na$_x$CoO$_2$
Creators: name: Bourgeois, A.
name: Aligia, A. A.
name: Rozenberg, M. J
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We derive an effective Hamiltonian for highly correlated $t_{2g}$ states centered at the Co sites of Na$_x$CoO$_2$. The essential ingredients of the model are an O mediated hopping, a trigonal crystal-field splitting, and on-site effective interactions derived from the exact solution of a multi-orbital model in a CoO$_6$ cluster, with parameters determined previously. The effective model is solved by dynamical mean-field theory (DMFT). We obtain a Fermi surface (FS) and electronic dispersion that agrees well with angle-resolved photoemission spectra (ARPES). Our results also elucidate the origin of the "sinking-pockets" in different doping regimes.
Directly measuring the spatiotemporal electric field of ultrashort Bessel-X pulses
Creators: name: Bowlan, P.
name: Trebino, R.
name: Valtna-Lukner, H.
name: Lohmus, M.
name: Piksarv, P.
name: Saari, P.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Using SEA TADPOLE with micrometer-range spatial and femtosecond-range temporal resolution, we report the first direct spatiotemporal measurements of ultrashort Bessel-X pulses. We demonstrate their propagation invariance and superluminal velocity and verify our results with simulations
description: 2 pages 1 figure Submitted to CLEO/IQEC 09 on December 2, 2008
Helping Children with Autism package: parents' perspectives
Creators: name: Wilson, KD
Publisher: name: University Of Tasmania
Year: 2023

description: The aim of this research was to evaluate the Helping Children with Autism Package (HCW A) from the perspectives of a sample of participating parents with a child with Autism Spectrum Disorders (ASD). The evaluation focused on parental self-efficacy and indirectly on parental stress and the parents' reported child outcomes. To date in Australia there is little descriptive data on parents' perceptions of the HCWA package or its effectiveness to help ameliorate negative factors associated with parenting a child with ASD. The HCWA funding package is an early intervention program designed to provide suppmi, programs, and interventions to children with Autism Spectrum Disorders ASD under the age of seven and their parents. A 43 item questionnaire entitled Parents Perceptions Questionnaire (Wilson & Hay 2011) was developed to gather the data. This instrument included both open ended questions and Likert scale questions. The sample comprised 20 participants, all of whom were parents who had accessed the HCW A package. Overall, the parents repmied positive outcomes associated with their participating in programs linked to the HCW A package. In particular they reported improved educational outcomes for their child and higher levels of suppmi and self-confidence as a parent. The parents valued the oppmiunity to have both choice and greater access to intervention services and repmied a strong desire for the continuation of the HCWA package after their child turned seven years of age. The findings support the notion that access to early intervention programs improves the developmental outcomes for the child and compliments and supports families in their care-giving role.
Tailed radio galaxies as tracers of galaxy clusters. Serendipitous discoveries with the GMRT
Creators: name: Giacintucci, S.
name: Venturi, T.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report on the discovery of four new radio galaxies with tailed morphology. Tailed radio galaxies are generally found in rich environments, therefore their presence can be used as tracer of a cluster. The radio galaxies were found in the fields of Giant Metrewave Radio Telescope (GMRT) observations carried out at 610 MHz and 327 MHz devoted to other studies. We inspected the literature and archives in the optical and X-ray bands to search for galaxy clusters or groups hosting them. All the tailed radio galaxies serendipitously found in the GMRT fields are located in rich environments. Two of them belong to the candidate cluster NCS J090232+204358, located at z(phot)=0.0746; one belongs to the cluster MaxBCGJ223.97317+22.15620 at z(phot)=0.2619; finally we suggest that the fourth one is probing a galaxy cluster at z=0.1177, located behind A262, and so far undetected in any band. Our results strenghten the relevance of high sensitivity and high resolution radio data in the detection of galaxy clusters at intermediate redshift.
description: 8 pages, accepted for publication on Astronomy & Astrophysics
The response of dependent communities to ontogenetic and genetic change in Eucalyptus : the case of the Eucalyptus globulus x nitens hybrid system
Creators: name: Lawrence, R
Publisher: name: University Of Tasmania
Year: 2023

description: The abundance of 44 dependent taxa (insects and fungal pathogens) was censused on three year old trees of Eucalyptus globulus, E. nitens and their hybrids (F\\(_1\\), F\\(_2\\) and backcrosses) in a field trial, half of which had undergone the transition to adult foliage (heteroblastic) while the remainder still retained juvenile foliage (homoblastic). This ontogenetic change was shown to have an enormous impact on the composition of dependent communities, far exceeding the effect of genetic differences between the pure species and their hybrids. The dependent communities on the adult foliage was distinct from the community on the juvenile foliage, regardless of whether the juvenile foliage occurred in the upper or lower canopy. Significant differences in the communities was demonstrated on the upper and lower canopy of the homoblastic trees, clearly emphasising the importance of removing positional effects per se in studies of ontogenetic responses by dependent species. Eighty percent of the common taxa exhibited significant specialisation for either juvenile or adult foliage. Complex ontogenetic specialisation was shown by the Chrysophtharta agricola leaf eating beetle a significant pest species of eucalypt plantations in Tasmania. The adult beetle fed on the adult foliage of the eucalypts but the eggs were laid and the larvae predominantly fed on the juvenile foliage. This preferential response for adult foliage by the adult beetle was maintained in laboratory feeding trials clearly indicating a response to changing foliage characteristics. The dependent communities on E. globulus and E. nitens, the two most important plantation eucalypts in Tasmania, were shown to be significantly different on juvenile foliage but not adult foliage. Of the 20 common taxa studied 35% showed significant specialisation to one or other eucalypt species. Most species generalists exhibit either no response to F\\(_1\\) hybrids or tend to be more abundant on the hybrid (hybrid susceptibility). In contrast species specialists showed either dominant or additive responses to the F1 hybrids. On average trees of E. globulus and E. nitens supported equal numbers of dependent taxa, but all hybrid classes supported significantly greater numbers of dependent taxa than the pure species. This study is one of the few to remove confounding positional and genetic effects when studying the response of dependent taxa to ontogenetic change and is the first study to show a significant species response to ontogenetic variation at the community level. This is important in establishing a genetic basis to the increased dependent taxa reported .previously on hybrids as it has not confounded responses with differences in heteroblasty between pure species and hybrids hosts.
Tuning of electron transport through a moebius strip: shot noise
Creators: name: Maiti, Santanu K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We explore electron transport through a moebius strip attached to two metallic electrodes by the use of Green's function technique. A parametric approach is used based on the tight-binding model to characterize the electron transport through such a bridge system and it is observed that the transport properties are significantly affected by (a) the transverse hopping strength between the two channels and (b) the strip-to-electrode coupling strength. In this context we also describe the noise power of the current fluctuations that provides a key information about the electron correlation which is obtained by calculating the Fano factor ($F$). The knowledge of this current fluctuations gives important ideas for fabrication of efficient electronic devices.
description: 9 pages, 8 figures
Meta-stable nematic pre-ordering in smectic liquid crystalline phase transitions
Creators: name: Abukhdeir, Nasser Mohieddin
name: Rey, Alejandro D.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Modeling and simulation studies using a high-order Landau-de Gennes type model for the direct isotropic/smectic-A liquid crystal transition are presented showing the existence of meta-stable nematic pre-ordering under certain conditions, in agreement with experimental observations (Tokita, M. et al. Macromolecules 2006, 39, 2021-2023)
description: submitted for publication in Macromolecules as a Communication to the Editor 11APR2009
Are pre-main-sequence stars older than we thought?
Creators: name: Naylor, Tim
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We fit the colour-magnitude diagrams of stars between the zero-age main-sequence and terminal-age main sequence in young clusters and associations. The ages we derive are a factor 1.5 to 2 longer than the commonly used ages for these regions, which are derived from the positions of pre-main-sequence stars in colour-magnitude diagrams. From an examination of the uncertainties in the main-sequence and pre-main-sequence models, we conclude that the longer age scale is probably the correct one, which implies we must revise upwards the commonly used ages for young clusters and associations. Such a revision would explain the discrepancy between the observational lifetimes of proto-planetary discs and theoretical calculations of the time to form planets. It would also explain the absence of clusters with ages between 5 and 30Myr. We use the $τ^2$ statistic to fit the main-sequence data, but find that we must make significant modifications if we are to fit sequences which have vertical segments in the colour-magnitude diagram. We present this modification along with improvements to methods of calculating the goodness-of-fit statistic and parameter uncertainties. Software implementing the methods described in this paper is available from http://www.astro.ex.ac.uk/people/timn/tau-squared/
description: 13 pages, 9 figures, accepted form MNRAS
On the Interpretation of Delays in Delay Stochastic Simulation of Biological Systems
Creators: name: Barbuti, Roberto
name: Caravagna, Giulio
name: Milazzo, Paolo
name: Maggiolo-Schettini, Andrea
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Delays in biological systems may be used to model events for which the underlying dynamics cannot be precisely observed. Mathematical modeling of biological systems with delays is usually based on Delay Differential Equations (DDEs), a kind of differential equations in which the derivative of the unknown function at a certain time is given in terms of the values of the function at previous times. In the literature, delay stochastic simulation algorithms have been proposed. These algorithms follow a "delay as duration" approach, namely they are based on an interpretation of a delay as the elapsing time between the start and the termination of a chemical reaction. This interpretation is not suitable for some classes of biological systems in which species involved in a delayed interaction can be involved at the same time in other interactions. We show on a DDE model of tumor growth that the delay as duration approach for stochastic simulation is not precise, and we propose a simulation algorithm based on a ``purely delayed'' interpretation of delays which provides better results on the considered model.
Formation of black-hole X-ray binaries in globular clusters
Creators: name: Ivanova, N.
name: Chaichenets, S.
name: Fregeau, J.
name: Heinke, C. O.
name: Lombardi, J. C.
name: Woods, T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Inspired by the recent identification of the first candidate BH-WD X-ray binaries, where the compact accretors may be stellar-mass black hole candidates in extragalactic globular clusters, we explore how such binaries could be formed in a dynamical environment. We provide analyses of the formation rates via well known formation channels like binary exchange and physical collisions and propose that the only possibility to form BH-WD binaries is via coupling these usual formation channels with subsequent hardening and/or triple formation. Indeed, we find that the most important mechanism to make a BH-WD X-ray binary from an initially dynamically formed BH-WD binary is triple induced mass transfer via the Kozai mechanism. Even using the most optimistic estimates for the formation rates, we cannot match the observationally inferred production rates if black holes undergo significant evaporation from the cluster or form a completely detached subcluster of black holes. We estimate that at least 1% of all formed black holes, or presumably 10% of the black holes present in the core now, must be involved in interactions with the rest of the core stellar population.
description: 10 pages, 2 figures, submitted to ApJ
MARCS model atmospheres
Creators: name: Plez, Bertrand
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this review presented at the Symposium A stellar journey in Uppsala, June 2008, I give my account of the historical development of the MARCS code from the first version published in 1975 and its premises to the 2008 grid. It is shown that the primary driver for the development team is the science that can be done with the models, and that they constantly strive to include the best possible physical data. A few preliminary comparisons of M star model spectra to spectrophotometric observations are presented. Particular results related to opacity effects are discussed. The size of errors in the spectral energy distribution (SED) and model thermal stratification are estimated for different densities of the wavelength sampling. The number of points used in the MARCS 2008 grid (108000) is large enough to ensure errors of only a few K in all models of the grid, except the optically very thin layers of metal-poor stars. Errors in SEDs may reach about 10% locally in the UV. The published sampled SEDs are thus appropriate to compute synthetic broad-band photometry, but higher resolution spectra will be computed in the near future and published as well on the MARCS site (marcs.astro.uu.se). Test model calculations with TiO line opacity accounted for in scattering show an important cooling of the upper atmospheric layers of red giants. Rough estimates of radiative and collisional time scales for electronic transitions of TiO indicate that scattering may well be the dominant mechanism in these lines. However models constructed with this hypothesis are incompatible with optical observations of TiO (Arcturus) or IR observations of OH (Betelgeuse), although they may succeed in explaining H2O line observations. More work is needed in that direction.
description: Review talk at the conference "A stellar journey" held in Uppsala, June 2008. In press in Physica Scripta, eds. Paul Barklem, Andreas Korn, and Bertrand Plez
Dynamic heterogeneities in critical coarsening: Exact results for correlation and response fluctuations in finite-sized spherical models (Version 2)
Creators: name: Annibale, Alessia
name: Sollich, Peter
Publisher: name: arXiv
Year: 2009
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: This manuscript, a revised version of arXiv:0811.3168v1, was inadvertently submitted as a separate paper. It can now be accessed, including some final corrections for the published version, as arXiv:0811.3168v2.
description: This manuscript, a revised version of 0811.3168v1, was inadvertently submitted as a separate paper. It can now be accessed, including some final corrections for the published version, as 0811.3168v2
On the abundance of gravitational arcs produced by submillimeter galaxies at radio and submm wavelengths
Creators: name: Fedeli, C.
name: Alba, A. Berciano
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We predict the abundance of giant gravitational arcs produced by submillimeter galaxies (SMGs) lensed by foreground galaxy clusters, both at radio and submm wavelengths. The galaxy cluster population is modeled in a realistic way with the use of semi-analytic merger trees, while the density profiles of individual deflectors take into account ellipticity and substructures. The adopted typical size of the radio and submm emitting regions of SMGs is based on current radio/CO observations and the FIR-radio correlation. The source redshift distribution has been modeled using three different functions (based on spectroscopic/photometric redshift measurements and a simple evolutionary model) to quantify the effect of a high redshift tail on the number of arcs. The source number counts are compatible with currently available observations, and were suitably distorted to take into account the lensing magnification bias. We present tables and plots for the numbers of radio and submm arcs produced by SMGs as a function of surface brightness, useful for the planning of future surveys aimed at arc statistics studies. They show that e.g., the detection of several hundred submm arcs on the whole sky with a signal-to-noise ratio of at least 5 requires a sensitivity of 1 mJy arcsec$^{-2}$ at $850 μ$m. Approximately the same number of radio arcs should be detected with the same signal-to-noise ratio with a surface brightness threshold of $20 μ$Jy arcsec$^{-2}$ at 1.4 GHz. Comparisons of these results with previous work found in the literature are also discussed.
description: 22 pages, 11 figures, 7 tables. Accepted by A&A
The dynamical origin of the universality classes of spatiotemporal intermittency
Creators: name: Jabeen, Zahera
name: Gupte, Neelima
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Studies of the phase diagram of the coupled sine circle map lattice have identified the presence of two distinct universality classes of spatiotemporal intermittency viz. spatiotemporal intermittency of the directed percolation class with a complete set of directed percolation exponents, and spatial intermittency which does not belong to this class. We show that these two types of behavior are special cases of a spreading regime where each site can infect its neighbors permitting an initial disturbance to spread, and a non-spreading regime where no infection is possible, with the two regimes being separated by a line, the infection line. The coupled map lattice can be mapped on to an equivalent cellular automaton which shows a transition from a probabilistic cellular automaton to a deterministic cellular automaton at the infection line. The origins of the spreading-non-spreading transition in the coupled map lattice, as well as the probabilistic to deterministic transition in the cellular automaton lie in a dynamical phenomenon, an attractor-widening crisis at the infection line. Indications of unstable dimension variability are seen in the neighborhood of the infection line. This may provide useful pointers to the spreading behavior seen in other extended systems.
description: 20 pages, 9 figures
Charge Dynamics of Vortex Cores in Layered Chiral Triplet Superconductors
Creators: name: Eschrig, M.
name: Sauls, J. A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In an accompanying paper [arXiv:0903.0011v1] we have studied the equilibrium properties of vortices in a chiral quasi-twodimensional triplet superfluid/superconductor. Here we extend our studies to include the dynamical response of a vortex core in a chiral triplet superconductor to an external a.c. electromagnetic field. We consider in particular the response of a doubly quantized vortex with a homogeneous core in the time-reversed phase. The external frequencies are assumed to be comparable in magnitude to the superconducting gap frequency, such that the vortex motion is non-stationary but can be treated by linear response theory. We include broadening of the vortex core bound states due to impurity scattering and consider the intermediate clean regime, with a broadening comparable to or larger than the quantized energy level spacing. The response of the order parameter, impurity self energy, induced fields and currents are obtained by a self-consistent calculation of the distribution functions and the excitation spectrum. Using these results we obtain the self-consistent dynamically induced charge distribution in the vicinity of the core. This charge density is related to the nonequilibrium response of the bound states and order parameter collective mode, and dominates the electromagnetic response of the vortex core.
description: 22 pages, 3 figures, typos corrected
Cavity cooling of an optically trapped nanoparticle
Creators: name: Barker, P. F.
name: Shneider, M. N.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We study the cooling of a dielectric nanoscale particle trapped in an optical cavity. We derive the frictional force for motion in the cavity field, and show that the cooling rate is proportional to the square of oscillation amplitude and frequency. Both the radial and axial centre-of-mass motion of the trapped particle, which are coupled by the cavity field, are cooled. This motion is analogous to two coupled but damped pendulums. Our simulations show that the nanosphere can be cooled to 1/e of its initial momentum over time scales of hundredths of milliseconds.
description: 11 pages
Galaxy Mergers and the Mass-Metallicity Relation: Evidence for Nuclear Metal Dilution and Flattened Gradients from Numerical Simulations
Creators: name: Rupke, David S. N.
name: Kewley, Lisa J.
name: Barnes, Joshua E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recent results comparing interacting galaxies to the mass-metallicity relation show that their nuclear oxygen abundances are unexpectedly low. We present analysis of N-body/SPH numerical simulations of equal-mass mergers that confirm the hypothesis that these underabundances are accounted for by radial inflow of low-metallicity gas from the outskirts of the two merging galaxies. The underabundances arise between first and second pericenter, and the simulated abundance dilution is in good agreement with observations. The simulations further predict that the radial metallicity gradients of the disk galaxies flatten shortly after first passage, due to radial mixing of gas. These predictions will be tested by future observations of the radial metallicity distributions in interacting galaxies.
description: ApJ Letters, in press; 6 pages, 5 figures
Quantum Hall effects of graphene with multi orbitals: Topological numbers, Boltzmann conductance and Semi-classical quantization
Creators: name: Arai, M.
name: Hatsugai, Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Hall conductance $σ_{xy}$ as the Chern numbers of the Berry connection in the magnetic Brillouin zone is calculated for a realistic multi band tight-band model of graphene with non-orthogonal basis. It is confirmed that the envelope of $σ_{xy}$ coincides with a semi-classical result when magnetic field is sufficiently small. The Hall resistivity $ρ_{xy}$ from the weak-field Boltzmann theory also explains the overall behaviour of the $σ_{xy}$ if the Fermi surface is composed of a single energy band. The plateaux of $σ_{xy}$ are explained from semi-classical quantization and necessary modification is proposed for the Dirac fermion regimes.
description: 5pages, 3figures
Sexual provinciality and characterization : a study of some recent Canadian fiction
Creators: name: Corbett, Nancy Jean
Publisher: name: University of British Columbia
Year: 2011

description: From its earliest beginning in Frances Brooke’s The History of Emily Montague, set in Canada and published in 1769, women have been prominent in Canadian literature. Since that time, a very large number of Canadian novels written by both men and women have been primarily concerned with a female character. In this thesis, an attempt has been made to determine to what extent an author's fictional world view and characterization is influenced by his sex; the area was narrowed to that of the Canadian novel in the period of approximately 1950-1965. Novels by Brian Moore, Sinclair Ross, Hugh MacLennan, Morley Callaghan, Adele Wiseman, Sheila Watson, Ethel Wilson, and Margaret Laurence were chosen as the main objects of the study. A recurrent theme emerged during the study of these novels; many of the authors appeared deeply concerned with the problem of personal and social isolation, and concluded that evil and fear, compassion and love neither originate outside the self nor remain confined to it. The metaphor used to characterize the fear-based isolation was often that of the wilderness, which might be internal, external, or both. A final conclusion about these novels, which are almost all based primarily on female characters, is that the ones created by women are generally more interesting and convincing. The male novelists tend to emphasize the sexual roles played by their female protagonists, while the women authors have a stronger tendency to write about women as people whose sexuality is important, but whose total personality is not constituted by this one aspect.
Toward a terminal zone
Creators: name: Coupey, Pierre
Publisher: name: University of British Columbia
Year: 2011

description: Now I have the opportunity to write the grand preface, I find I have too much to say, and so, again, it's easier to want to say nothing. The poems here want to give some pleasure, to anyone who cares to take it from them. The poems to come, the terminal zone itself, what I have been moving toward and into, in both poetry and painting, will not give pleasure. But here, for the moment, are some of the notes recorded on the way. They have involved that kind of feeling-in-sleep one experiences when one must rehearse old voices, surrounding voices, unheard voices, in order to find from the many sounds around us that one strong enough to sing.
Finite-Temperature Néel Ordering of Fluctuations in a Plaquette Orbital Model
Creators: name: Wenzel, Sandro
name: Janke, Wolfhard
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a pseudospin model which should be experimentally accessible using solid-state devices and, being a variation on the compass model, adds to the toolbox for the protection of qubits in the area of quantum information. Using Monte Carlo methods, we find for both classical and quantum spins in two and three dimensions Ising-type Neel ordering of energy fluctuations at finite temperatures without magnetic order. We also readdress the controversy concerning the stability of the ordered state in the presence of quenched impurities and present numerical results which are at clear variance with earlier claims in the literature.
description: 4 pages, 5 figures, revised and extended version
Nonthermal X-ray Emission from the N11 Superbubble in the Large Magellanic Cloud
Creators: name: Maddox, L. A.
name: Williams, R. M.
name: Dunne, B. C.
name: Chu, Y. -H
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the results of X-ray spectral analysis of the superbubble around the OB association LH9 in the H II complex N11 in the Large Magellanic Cloud. Using observations from Suzaku, we have modeled the X-ray emission over the energy range 0.2-7.5 keV. We constrained the thermal spectrum below 2 keV using a thermal plasma model found in a previous XMM-Newton study of the N11 region. We find that the hard X-ray emission (> 2 keV) requires a nonthermal power-law component. The photon index of this component was found to be $Γ=1.72\pm 0.15$. We performed an energy budget analysis for N11 using the known stellar content of LH9. We found that the observed thermal and kinetic energy in the superbubble is only half of the expected mechanical energy injected by stars.
description: 16 pages, 3 figures, submitted to ApJ
The ecology and conservation of bryophytes in Tasmanian wet eucalypt forest
Creators: name: Turner, Perpetua
Publisher: name: University Of Tasmania
Year: 2023

description: The aim of this study was to determine the factors that affect bryophyte richness and species composition in wet eucalypt forest, including old growth and forest disturbed by wildfire or silvicultural practice. Approximately one third of the total bryophyte flora for Tasmania was recorded in old growth mixed forest, with more liverwort than moss species found. Bryophyte species composition was significantly different between groups of sites of forest from the northwest, central and southern areas of the state. Mean annual temperature, altitude, rainfall of the driest month and aspect were most significant in predicting variation in bryophyte species composition. The use of vascular plants as surrogates for the conservation of bryophyte species was examined. Vascular plant and fern species richness were significant but poor predictors of bryophyte species richness. A minimum set of 31 sites reserved all vascular species and a large percentage (82.9%) of bryophyte species at least once. Thus, reserves selected using vascular plants are likely to reserve a large proportion of bryophyte species. The reserve sets included more sites of regenerating forest than old growth forest indicating the importance for conservation of multi-aged wet eucalypt forest. Many species preferentially occurred on a substrate type within a particular forest age class. The bryophyte species composition on old growth Nothofagus cunninghamii and Atherosperma moschatum trees were significantly dissimilar to a large number of other substrate/age class groups. Consistent with previous literature, bark type affected species composition. Comparisons of bryophytes in sites disturbed by wildfire and logging found four moss species occurred more frequently in logging than wildfire regeneration, whereas six of the seven bryophytes species that occurred more frequently after wildfire than logging disturbance were liverworts. Overall, little difference in bryophyte and vascular species composition was found between logging and wildfire regeneration. When sites were separated into regions, bryophyte species composition differed between logging and wildfire only in the forests of central Tasmania, where Eucalyptus regnans is dominant. Successional stages of bryophytes species occurrence after disturbance were documented. Species occurring frequently in primary succession did not survive into later successional stages. Many species that established in post-primary successional forest persisted into late successional forest. Liverwort species dominated in late successional forest. The exclusive occurrence of the epiphytic mosses Neckera pennata and Calyptopogon mnioides in regenerating forest is strongly associated with the presence of Pomaderris apetala and Acacia dealbata trees.
12.2-GHz methanol masers associated with 1.2-mm dust clumps: Quantifying high-mass star formation evolutionary schemes
Creators: name: Breen, S. L.
name: Ellingsen, S. P.
name: Caswell, J. L.
name: Lewis, B. E.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the results of a search for 12.2-GHz methanol maser emission, targeted towards 113 known 6.7-GHz methanol masers associated with 1.2-mm dust continuum emission. Observations were carried out with the Australia Telescope National Facility (ATNF) Parkes 64-m radio telescope in the period 2008 June 20 - 25. We detect 68 12.2-GHz methanol masers with flux densities in excess of our 5-sigma detection limit of 0.55 Jy, 30 of which are new discoveries. This equates to a detection rate of 60 per cent, similar to previous searches of comparable sensitivity. We have made a statistical investigation of the properties of the 1.2-mm dust clumps with and without associated 6.7-GHz methanol maser and find that 6.7-GHz methanol masers are associated with 1.2-mm dust clumps with high flux densities, masses and radii. We additionally find that 6.7-GHz methanol masers with higher peak luminosities are associated with less dense 1.2-mm dust clumps than those 6.7-GHz methanol masers with lower luminosities. We suggest that this indicates that more luminous 6.7-GHz methanol masers are generally associated with a later evolutionary phase of massive star formation than less luminous 6.7-GHz methanol maser sources. Analysis of the 6.7-GHz associated 1.2-mm dust clumps with and without associated 12.2-GHz methanol maser emission shows that clumps associated with both class II methanol maser transitions are less dense than those with no associated 12.2-GHz methanol maser emission; suggesting that 12.2-GHz methanol masers are associated with a later evolutionary phase of massive star formation. We present an evolutionary sequence for masers in high-mass star formation regions, placing quantitative estimates on the relative lifetimes for the first time.
description: Accepted to MNRAS 2009 October 4