cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Semiconducting nonperovskite ferroelectric oxynitride designed ab initio
Creators: name: Yu, Qisheng
name: Huang, Jiawei
name: Ke, Changming
name: Qian, Zhuang
name: Ma, Liyang
name: Liu, Shi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Recent discovery of HfO2-based and nitride-based ferroelectrics that are compatible to the semiconductor manufacturing process have revitalized the field of ferroelectric-based nanoelectronics. Guided by a simple design principle of charge compensation and density functional theory calculations, we discover HfO2-like mixed-anion materials, TaON and NbON, can crystallize in the polar Pca21 phase with a strong thermodynamic driving force to adopt anion ordering spontaneously. Both oxynitrides possess large remnant polarization, low switching barriers, and unconventional negative piezoelectric effect, making them promising piezoelectrics and ferroelectrics. Distinct from HfO2 that has a wide band gap, both TaON and NbON can absorb visible light and have high charge carrier mobilities, suitable for ferroelectric photovoltaic and photocatalytic applications. This new class of multifunctional nonperovskite oxynitride containing economical and environmentally benign elements offer a platform to design and optimize high-performing ferroelectric semiconductors for integrated systems.
Erratum to: Tissue biomarkers as vulnerability indicators in the clam Polymesoda caroliniana [17: 186-197, 2020]
Creators: name: Jerónimo-Juárez, J R
name: Matadamas-Guzman, ML
name: Guerrero Legarreta, I
name: Segoviano-Ramírez, J C
name: Del Rocío Zarate-Hernández, M
name: Arteaga-Silva, M
name: Guzmán-García, X
Publisher: name: Invertebrate Survival Journal
Year: 2020

description: Invertebrate Survival Journal, Vol 17 No 1 (2020)
Parent-child play interactions in immigrant South-Asian families
Creators: name: Goldstein, Maya
Publisher: name: University of British Columbia
Year: 2010

description: In this study South Asian immigrant parent-child play interactions and parents’ perceptions of the role of play in their children’s development were examined. Most studies regarding play were conducted in North America; however only a few studies focused on immigrants. This study used an ethnographic approach and had two phases. In the first phase participant observations were conducted with thirteen parents and their children in a drop-in centre and a staff member from the drop-in centre was interviewed. In the second phase, two families were observed in their home environment, semi-structured interviews were conducted with the parents and the mothers completed calendar logs on their children’s activities. The findings from both the drop-in centre and the families’ homes suggested that there were two main approaches to play and development. The first was a directed approach to play with a focus on educational play activities, and an emphasis on cognitive development. At the centre some parents stayed physically close to their children and focused on structured art activities and alphabet or number toys. The second approach was a natural approach to play in which the parents did not guide their children during play, and believed that in order to learn children should make their own decisions regarding with what and with whom to play. At the centre some mothers spent most of their time socializing with other mothers while the children played by themselves or occasionally with other children. There were also differences in the play patterns in Canada and India, and the parents found themselves caught between those two contexts. In their own culture and tradition parents did not play much with their children because there were always other play partners close by such as neighbors, cousins, siblings, friends and grandparents. However, in Canada the parents were influenced by what they heard in the centre regarding the “learning through play” philosophy and how parents should devote time to play with their children.
The Gravitational Exclusion Principle and Null States in Anti-de Sitter Space
Creators: name: Castro, Alejandra
name: Hartman, Thomas
name: Maloney, Alexander
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The holographic principle implies a vast reduction in the number of degrees of freedom of quantum gravity. This idea can be made precise in AdS_3, where the the stringy or gravitational exclusion principle asserts that certain perturbative excitations are not present in the exact quantum spectrum. We show that this effect is visible directly in the bulk gravity theory: the norm of the offending linearized state is zero or negative. When the norm is negative, the theory is signaling its own breakdown as an effective field theory; this provides a perturbative bulk explanation for the stringy exclusion principle. When the norm vanishes the bulk state is null rather than physical. This implies that certain non-trivial diffeomorphisms must be regarded as gauge symmetries rather than spectrum-generating elements of the asymptotic symmetry group. This leads to subtle effects in the computation of one-loop determinants for Einstein gravity, higher spin theories and topologically massive gravity in AdS_3. In particular, heat kernel methods do not capture the correct spectrum of a theory with null states.
description: 17 pages
New Theoretical And Observational Results On Disc Photoevaporation
Creators: name: Clarke, Cathie
Publisher: name: Zenodo
Year: 2016

description: I will describe two new results i) the first  analytic description for the two dimensional structure of an isothermal disc wind and ii) a suite of solutions for the one-dimenensional structure of a disc wind driven by external FUV photoevaporation. I will highlight how these results can be applied to the derivation of observational diagnostics from photoevaporating discs.
description: Richard Alexander (Leicester), Stefano Facchini (MPE), Serena Kim (Arizona), Tom Haworth (IOA)
Tailed skyrmions -- an obscure branch of magnetic solitons
Creators: name: Kuchkin, Vladyslav M.
name: Kiselev, Nikolai S.
name: Bessarab, Pavel F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report tailed skyrmions -- a new class of stable soliton solutions of the 2D chiral magnet model. Tailed skyrmions have elongated shapes and emerge in a narrow range of fields near the transition between the spin spirals and the saturated state. We analyze the stability range of these solutions in terms of external magnetic field and magnetocrystalline anisotropy. Minimum energy paths and the homotopies (continuous transitions) between tailed skyrmions of the same topological charge have been calculated using the geodesic nudged elastic bands method. The discovery of tailed skyrmions extends the diversity of already-known solutions illustrated by complex morphology solitons, such as tailed skyrmion bags with and without chiral kinks.
description: 7 pages, 6 figures
Fast magneto-acoustic wave turbulence and the Iroshnikov-Kraichnan spectrum
Creators: name: Galtier, Sebastien
Publisher: name: arXiv
Year: 2023
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: An analytical theory of wave turbulence is developed for pure compressible magnetohydrodynamics in the small $β$ limit. In contrast to previous works where the multiple scale method was not mentioned and slow magneto-acoustic waves were included, I present here a theory for fast magneto-acoustic waves only for which an asymptotic closure is possible in three dimensions. I introduce the compressible Elsasser fields (canonical variables) and show their linear relationship with the mass density and the compressible velocity. The kinetic equations of wave turbulence for three-wave interactions are obtained and the detailed conservation is shown for the two invariants, energy and momentum (cross-helicity). An exact stationary solution (Kolmogorov-Zakharov spectrum) exists only for the energy. I find a $k^{-3/2}$ energy spectrum compatible with the Iroshnikov-Kraichnan (IK) phenomenological prediction; this leads to a mass density spectrum with the same scaling. Despite the presence of a relatively strong uniform magnetic field, this turbulence is characterized by an energy spectrum with a power index that is independent of the angular direction; its amplitude, however, shows an angular dependence. I prove the existence of the IK solution using the locality condition, show that the energy flux is positive and hence the cascade direct, and find the Kolmogorov constant. This theory offers a plausible explanation for recent observations in the solar wind at small $β$ where isotropic spectra with a $-3/2$ power law index are found and associated with fast magneto-acoustic waves. This theory may also be used to explain the IK spectrum often observed near the Sun. Besides, it provides a rigorous theoretical basis for the well-known phenomenological IK spectrum, which coincides with the Zakharov-Sagdeev spectrum for acoustic wave turbulence.
description: 26 pages, 3 figures
Selective Gas Sensing with a Single Pristine Graphene Transistor
Creators: name: Rumyantsev, Sergey
name: Liu, Guanxiong
name: Shur, Michael S.
name: Potyrailo, Radislav A.
name: Balandin, Alexander A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that vapors of different chemicals produce distinguishably different effects on the low-frequency noise spectra of graphene. It was found in a systematic study that some gases change the electrical resistance of graphene devices without changing their low-frequency noise spectra while other gases modify the noise spectra by inducing Lorentzian components with distinctive features. The characteristic frequency fc of the Lorentzian noise bulges in graphene devices is different for different chemicals and varies from fc=10 - 20 Hz to fc=1300 - 1600 Hz for tetrahydrofuran and chloroform vapors, respectively. The obtained results indicate that the low-frequency noise in combination with other sensing parameters can allow one to achieve the selective gas sensing with a single pristine graphene transistor. Our method of gas sensing with graphene does not require graphene surface functionalization or fabrication of an array of the devices with each tuned to a certain chemical.
description: 17 pages, 5 figures, 1 table, presented at several conferences in 2011
Shocks and Photoionization of the Inner 650 AU Jet of the Interacting Binary Star R Aquarii from Multiwavelength Hubble Space Telescope Observations
Creators: name: Huang, Caroline D.
name: Karovska, Margarita
name: Hack, Warren
name: Raymond, John C.
name: Montez, Rodolfo
name: Kashyap, Vinay L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Astrophysical jets are present in a range of environments, including young stellar objects, X-ray binaries, and active galactic nuclei, but their formation is still not fully understood. As one of the nearest symbiotic binary stars, R Aquarii ($D \sim 220$ pc) offers a unique opportunity to study the inner region within $\sim$ 600 AU of the jet source, which is particularly crucial to our understanding of non-relativistic jet formation and origin. We present high-angular resolution ultraviolet and optical imaging from the \emph{Hubble} Space Telescope in six emission-line regions of the inner jet. Using these observations to obtain a range of representative line ratios for our system and kinematic data derived from a comparison with previous studies, we model the shocked gas in order to determine the relative roles of shock heating and photoionization in the R Aquarii system. We find that our shock models suggest a nonzero magnetic field is needed to describe the measured line ratios. We also find that the Mg~II$λλ$2795,2802 intensities are overpredicted by our models for most of the jet regions, perhaps because of depletion onto grains or to opacity in these resonance lines.
description: 22 pages, 10 figures, accepted for publication in ApJ
Exploring the Potential Role of Telehealth in the Expansion of Mental Health Access for an Inner-City Latinx Population
Creators: name: Sepulveda, Luisa
Publisher: name: University of Chicago
Year: 2018
Subjects: subject: telehealth
subject: mental health
subject: South Lawndale
subject: Latinx Chicagoans

description: This paper explores the potential role of telehealth in the expansion of mental health access for an innercity Latinx population by engaging with providers and stakeholders of various community health centers in the South Lawndale community of Chicago—a community whose population is predominantly Latinx, lowincome, and uninsured. While the literature and stakeholders cannot see telehealth surpassing or replacing standard face-to-face care, they see a lot of potential to make processes more efficient. Through analyzing the literature, survey data, interviews with stakeholders, and recruitment and education content, recommendations are made to 1) Move towards a mental health model that is more focused on preventative and trauma-focused care 2) Improve cultural-competency by encouraging the entry of Latinxs into the medical profession and by promoting cultural-competency training 3) Reframe and reposition the benefits of telehealth by channeling more funding and research into exploring the role of telehealth in addressing access 4) Use evidence to encourage the expansion of coverage for telehealth through CMS, private insurers, and employers and 5) Establish a clear legal framework to standardize the evaluation of telehealth interventions and provide a streamlined process for the licensing of providers.
Whose water crisis? How government drought responses widen inequality
Creators: name: David, Olivia
Publisher: name: My University
Year: 2022
Subjects: environmental justice
drought policy
hydraulic citizenship
California
South Africa

description: Recent severe droughts in California, USA and the Western Cape Province, South Africa attracted global attention as water scarcity challenged cities, rural communities, agricultural industries, and ecosystems in varied ways. Governments responded to these conditions by setting and ultimately achieving water conservation targets, and scholarship evaluating the causes and consequences of both droughts from diverse perspectives emerged. This study extends existing scholarship by comparing drought responses in terms of their effects on water (in)justice, or social inequality as evinced in relationships to water access networks. In so doing, I explain how and why the drought responses materialized and manifested in widened inequalities, using information from previous research on the droughts and drought responses, policy documents, and interviews with key informants in each region about their perspectives on the droughts and the ensuing policy responses. I analyzed these data using mechanism-based process tracing methods. In both cases, causal mechanisms linking government responses to widened inequalities include what I identify as values-reinforcement mechanisms and strategic communication mechanisms. The common presence of these mechanisms reveals the resilience of dominant social values and constructions, even in response to socio-environmental challenges. The particular importance of interlinked policy- and household-level decisions around groundwater resources during drought events also emerged through comparative analysis of the cases. To conclude, I suggest practical implications based on these insights and areas for future research, highlighting droughts as consequential policy sites for advancing social and environmental justice.
Revisiting the alignment of radio galaxies in the ELAIS-N1 field
Creators: name: Simonte, Marco
name: Andernach, Heinz
name: Brueggen, Marcus
name: Best, Philip
name: Osinga, Erik
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Aims. Previous studies reported an alignment of the major axes of radio galaxies on various angular scales. Here, we study the alignment of radio galaxies in the ELAIS-N1 Low Frequency ARray (LOFAR) deep field, which covers an area of 25 $\rm deg^2$. \newline Methods. The low noise level of about 20$ \rm ~ μJy/beam$ of the LOFAR deep field observations at 150 MHz enabled the identification of 447 extended ($> 30 \rm ''$) radio galaxies for which we have measured the major axis position angle. We found that 95\% of these sources have either photometric or spectroscopic redshifts, which we then used for a three-dimensional analysis. \newline Results. We show the distribution of the position angles of radio galaxies in the ELAIS-N1 field and perform multiple statistical tests to check whether the radio galaxies are randomly oriented. We found that the distribution of position angles is consistent with being uniform. Two peaks around position angles of 50 and 140$\rm~ deg$ are spurious and are not caused by an alignment, as shown by a 3D analysis. In conclusion, our results do not support a 2D or 3D alignment of radio galaxies on scales smaller than $\sim 4 \rm ~ deg$.
description: 10 pages, 6 figures, 2 tables Accepted for publication in A&A
Nuclear Pairing from Chiral Pion-Nucleon Dynamics: Applications to Finite Nuclei
Creators: name: Finelli, Paolo
name: Niksic, Tamara
name: Vretenar, Dario
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The 1S0 pairing gap in isospin-symmetric nuclear matter and finite nuclei is investigated using the chiral nucleon-nucleon potential at the N3LO order in the two-body sector, and the N2LO order in the three-body sector. To include realistic nuclear forces in RHB (Relativistic Hartree Bolgoliubov) calculations we rely on a separable form of the pairing interaction adjusted to the bare nuclear force. The separable pairing force is applied to the analysis of pairing properties for several isotopic and isotonic chains of spherical nuclei.
description: 13 pages, 3 figures, submitted to PRC
870 micron Imaging of a Transitional Disk in Upper Scorpius: Holdover from the Era of Giant Planet Formation?
Creators: name: Mathews, Geoffrey S.
name: Williams, Jonathan P.
name: Menard, Francois
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present 880 micron images of the transition disk around the star [PZ99] J160421.7-213028, a solar-mass star in the nearby Upper Scorpius association. With a resolution down to 0.34 arcsec, we resolve the inner hole in this disk, and via model fitting to the visibilities and spectral energy distribution we determine both the structure of the outer region and the presence of sparse dust within the cavity. The disk contains about 0.1 Jupiter masses of mm-emitting grains, with an inner disk edge of about 70 AU. The inner cavity contains a small amount of dust with a depleted surface density in a region extending from about 20-70 AU. Taking into account prior observations indicating little to no stellar accretion, the lack of a binary companion, and the presence of dust near 0.1 AU, we determine that the most likely mechanism for the formation of this inner hole is the presence of one or more giant planets.
description: 12 pages, 7 figures. To appear in the Astrophysical Journal
4D Nucleome-Guided Cellular Reprogramming
Creators: name: Dotson, Gabrielle
Publisher: name: My University
Year: 2022
Subjects: subject: cellular reprogramming
subject: 4D nucleome
subject: Hi-C
subject: transcriptomics
subject: chromatin biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular, Cellular and Developmental Biology
subject: Science (General)
subject: Science

description: The 4D Nucleome (4DN) refers to the dynamical relationship between chromatin architecture and gene expression in the nucleus that gives rise to cellular phenotype. Our ability to steer cellular phenotype hinges on our ability to understand and precisely characterize a dynamic cellular state. The 4DN framework can be instrumental in helping to realize such reprogramming potential. In this dissertation, I demonstrate how 4DN data can be used to evaluate the impact of perturbations to a cell, examining how TF silencing sensitizes colorectal cancer cells to treatment and assessing how altering genome structure could be a viable therapeutic strategy harnessed for directly modulating in vivo disease processes. I then showcase how recent experimental innovations have allowed us to refine the 4DN framework. Profiling spatially-resolved gene expression in tissue, I characterize the disruption of adult adipose tissue morphogenesis during obesity progression. Finally, I offer a computational framework to analyze multi-way chromatin interactions and reveal organization principles of the genome that govern how transcription factors regulate the formation of transcription clusters. The culmination of this work has allowed us to move beyond the traditional scope of 4DN and consider insights from spatial networks and complex higher-order genome organization. Together, these advances can enable us to develop reprogramming regimes that reach target states with higher fidelity through exploring endogenous nucleome modifications, considering the anatomical context of cells, and ensuring recapitulation of a target cell’s conformational state.
H2 flows in the Corona Australis cloud and their driving sources
Creators: name: Kumar, M. S. N.
name: Sharma, Saurabh
name: Davis, C. J .
name: Borissova, J.
name: Grave, J. M. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We uncover the H2 flows in the Corona Australis molecular cloud and in particular identify the flows from the Coronet cluster. Near-infrared H2 v=1--0 S(1), 2.12micron-line, narrow-band imaging survey of the R CrA cloud core was carried out. We identify the best candidate-driving source for each outflow by comparing the flow properties, available proper motions, and the known/estimated properties of the driving sources. We also adopted the thumbrule of outflow power as proportional to source luminosity and inversely proportional to the source age to reach a consensus. Results: Continuum-subtracted, narrow-band images reveal several new Molecular Hydrogen emission-line Objects (MHOs). Together with previously known MHOs and Herbig-Haro objects we catalog at least 14 individual flow components of which 11 appear to be driven by the RCrA aggregate members. The flows originating in the Coronet cluster have lengths of ~0.1-0.2 pc. Eight out of nine submillimeter cores mapped in the Coronet cluster region display embedded stars driving an outflow component. Roughly 80% of the youngest objects in the Coronet are associated with outflows. The MHO flows to the west of the Coronet display lobes moving to the west and vice-versa, resulting in nondetections of the counter lobe in our deep imaging. We speculate that these counterflows may be experiencing a stunting effect in penetrating the dense central core. Conclusions:Although this work has reduced the ambiguities for many flows in the Coronet region, one of the brightest H2 feature (MHO2014) and a few fainter features in the region remain unassociated with a clear driving source. The flows from Coronet, therefore, continue to be interesting targets for future studies.
description: 10 pages, 4 figures, Accepted by A&A
Distances to nearby molecular clouds traced by young stars
Creators: name: Zhang, Miaomiao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: I present a catalog of distances to 63 molecular clouds located within ~2.5 kpc of the Sun. The cloud distances are derived based on utilizing the Gaia DR3 parallaxes of the young stellar objects (YSOs). By identifying AllWISE YSO candidates (YSOCs) with infrared excesses and combining them with published YSOC catalogs, I compile an all-sky YSOC sample that is devoid of a significant proportion of contaminants. Using Gaia DR3 astrometric measurements, I associate over 3000 YSOCs with 63 local clouds and obtain the average distance to each cloud by fitting the YSOC parallax distribution within the cloud. I find good agreements with typical scatter of <10% between my new cloud distances and previous distance estimates. Unlike cloud distances obtained using stellar extinction, my catalog provides distances to the relatively dense areas of local clouds, which makes them more appropriate references for investigating the physical properties of nearby dense regions.
description: 31 pages; 11 figures; one of figures is a figset including 63 components; figset can be obtained as part of source files; accepted by ApJS
Data and estimating missing data for the Puget Sound Chinook salmon ESU 5-year status review.
Creators: name: Sands, Norma Jean, 1946-
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Northwest Fisheries Science Center
Year: 2015
Subjects: subject: Chinook salmon--Counting--Washington (State)--Puget Sound--Statistical methods.

description: This report documents the data used for the National Marine Fisheries Service’s 2010 5-year status review of the Puget Sound Chinook Salmon Evolutionarily Significant Unit (ESU) populations (Ford 2011, NMFS 2011). It also documents the methods used to estimate values for missing years of data in order to develop the complete time series needed for cohort run reconstruction. The length of the time series for each population was determined by the availability of spawning abundance estimates. Data were supplied by state and tribal comanagers, either in reports or directly as the result of the public request for data as part of the 5-year status review of the Puget Sound Chinook Salmon ESU (NMFS 2010). The status review focused primarily on abundance and productivity of the 22 populations identified by the Puget Sound Technical Recovery Team (PS TRT) and used in the recovery plan (Ruckelshaus et al. 2006, SSDC 2007). In Table 1 through Table 22 of this report, data supplied by comanagers or obtained from reports are in normal font and estimates for missing data used in this analysis are in boldface. Methods for estimating missing data are provided in detail in the descriptions of each watershed population (22 populations in the 12 subsections of the Population-specific Data and Methods section).
A Radial Velocity Study of CTCV J1300-3052
Creators: name: Savoury, C. D. J.
name: Littlefair, S. P.
name: Marsh, T. R.
name: Dhillon, V. S.
name: Parsons, S. G.
name: Copperwheat, C. M.
name: Steeghs, D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present time-resolved spectroscopy of the eclipsing, short period cataclysmic variable CTCV J1300-3052. Using absorption features from the secondary star, we determine the radial velocity semi-amplitude of the secondary star to be K2 = 378 \pm 6 km/s, and its projected rotational velocity to be v sin i = 125 \pm 7 km/s. Using these parameters and Monte Carlo techniques, we obtain masses of M1 = 0.79 \pm 0.05 MSun for the white dwarf primary and M2 = 0.198 \pm 0.029 MSun for the M-type secondary star. These parameters are found to be in excellent agreement with previous mass determinations found via photometric fitting techniques, supporting the accuracy and validity of photometric mass determinations in short period CVs.
description: Accepted for publication in MNRAS (24th January 2012). 10 pages, 9 figures (black and white)
Evolution of complex magnetic phases and metal-insulator transition through Nb substitution in La$_{0.5}$Sr$_{0.5}$Co$_{1-x}$Nb$_x$O$_3$
Creators: name: Shukla, Rishabh
name: Dhaka, R. S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the evolution of structural, magnetic, transport, and electronic properties of bulk polycrystalline La$_{0.5}$Sr$_{0.5}$Co$_{1-x}$Nb$_x$O$_3$ ($x =$ 0.025--0.25) samples. The Rietveld refinement of the x-ray diffraction patterns with R$\bar3$c space group reveals that the lattice parameters and rhombohedral distortion monotonously increase with the Nb$^{5+}$(4$d^0$) substitution ($x$). The magnetic susceptibility exhibits a decrease in the magnetic ordering temperature and net magnetization with $x$, which manifests that the Nb substitution dilutes the ferromagnetic (FM) double exchange interaction and enhances the antiferromagnetic (AFM) super-exchange interaction. Interestingly, for the $x>$ 0.1 samples the FM order is completely suppressed and the emergence of a glassy state is clearly evident. Moreover, the decrease in the coercivity (H$\rm_{C}$) and remanence (M$\rm_{r}$) with $x$ in the magnetic isotherms measured at 5~K further confirms the dominance of AFM interactions and reduction of FM volume fraction for the $x>$ 0.1 samples. More interestingly, we observe resistivity minima for the $x=$ 0.025 and 0.05 samples, which are analyzed using the quantum corrections in the conductivity, and found that the weak localization effect dominates over the renormalized electron-electron interactions in the 3D limit. Further, a semiconducting resistivity behavior is obtained for $x>$ 0.05, which follows the Arrhenius law at high temperatures ($\sim$160--320~K), and the 3D-variable range hopping prevails in the low-temperature region ($<$160~K). The core-level photoemission spectra confirm the valence state of constituent elements and the absence of Co$^{2+}$ is discernible.
description: submitted
A Collection of Ecuadorian Artisanal Fishermen's Perspectives on Ocean Conservation
Creators: name: Dabrowski, Maria
Publisher: name: My University
Year: 2022
Subjects: fisherman
ocean conservation
ecuador
behavior change

description: Ecuadorian artisanal fisheries comprise 87% of artisanal fisheries bycatch in the Eastern Tropical Pacific. [1] While there are solutions to diminishing bycatch, mistrust has grown between artisanal fishers and Ecuador's government. Therefore, government-proposed conservation technologies and policies are often not implemented by fishermen, and thus are largely ineffective. These conservation techniques will likely continue to be ineffective until fishermen’s perspectives and opinions are acknowledged and their priorities integrated into local and national policies. This study aims to understand the relationships between the ocean, marine organisms and fishermen to 1) improve the livelihood of artisanal fishermen, 2) help increase marine wildlife populations in the area and 3) foster relationships between fishermen and government agencies to create bottom-up and top-down conservation policies. Surveys occurred at various points along Ecuador’s coast. This survey is important in designing effective, collaborative and inclusive solutions to fisheries bycatch to prevent the extirpation of species like leatherback sea turtles and hammerhead sharks. Our survey contains questions to understand 1) fishermen's relationships to the ocean, 2) how fishermen define conservation, 3) fishermen’s conservation priorities, 4) the relationship between fishermen and marine animals and 5) how fishermen feel about fishing technologies, policies and regulations in Ecuador. The results from this study have been analyzed for patterns and compiled into this easy-to-read report, which also includes recommendations for future policy proceedings that are grounded in effective environmental psychology principles. This report is intended to be presented to local and federal Ecuadorian government officials by The Leatherback Project (TLP) team to impact future marine conservation decision-making.
Electronic and Magnetic Structures of Chain Structured Iron Selenide Compounds
Creators: name: Li, Wei
name: Setty, Chandan
name: Chen, X. H.
name: Hu, Jiangping
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Electronic and magnetic structures of iron selenide compounds Ce2O2FeSe2 (2212\ast) and BaFe2Se3(123\ast) are studied by the first-principles calculations. We find that while all these compounds are composed of one-dimensional (1D) Fe chain (or ladder) structures, their electronic structures are not close to be quasi-1D. The magnetic exchange couplings between two nearest-neighbor (NN) chains in 2212\ast and between two NN two-leg-ladders in 123\ast are both antiferromagnetic (AFM), which is consistent with the presence of significant third NN AFM coupling, a common feature shared in other iron-chalcogenides, FeTe (11\ast) and KyFe2-xSe2 (122\ast). In magnetic ground states, each Fe chain of 2212\ast is ferromagnetic and each two-leg ladder of 123\ast form a block-AFM structure. We suggest that all magnetic structures in iron-selenide compounds can be unified into an extended J1-J2-J3 model. Spin-wave excitations of the model are calculated and can be tested by future experiments on these two systems.
description: 6 pages, 6 figures, 2 tables
Comparing numerical relativity and perturbation theory waveforms for a non-spinning equal-mass binary
Creators: name: Islam, Tousif
name: Field, Scott E.
name: Khanna, Gaurav
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Past studies have empirically demonstrated a surprising agreement between gravitational waveforms computed using adiabatic-driven-inspiral point-particle black hole perturbation theory (ppBHPT) and numerical relativity (NR) following a straightforward calibration step, sometimes referred to as $α$-$β$ scaling. Specifically focusing on the quadrupole mode, this calibration technique necessitates only two time-independent parameters to scale the overall amplitude and time coordinate. In this article, part of a special issue, we investigate this scaling for non-spinning binaries at the equal mass limit. Even without calibration, NR and ppBHPT waveforms exhibit an unexpected degree of similarity after accounting for different mass scale definitions. Post-calibration, good agreement between ppBHPT and NR waveforms extends nearly up to the point of the merger. We also assess the breakdown of the time-independent assumption of the scaling parameters, shedding light on current limitations and suggesting potential generalizations for the $α$-$β$ scaling technique.
description: Published in a themed issue in honor of Prof. Jorge Pullin on his 60th anniversary; Universe 2024, 10(1), 25
A narrative analysis of how adolescents construct career
Creators: name: Wolinsky, Elaina Paulette
Publisher: name: University of British Columbia
Year: 2010

description: Currently, the concept of career is evolving. While the concept of career is changing, the developmental stage of adolescence is being prolonged. Within this context, this study focused on the adolescent experience; specifically, how are grade 12’s constructing their careers according to this new vision of career and adulthood? The purpose of this study was to learn more about the adolescent experience to be better able to support them throughout this transition. This study used semi-structured interviews to gather narratives from seven grade 12 students. Through a holistic-content analysis, four main themes emerged from the data. There were three main themes around identity. The first explained how participants relied on their identity to make career decisions. The second theme was how participants expressed a need to explore who they are to be able to commit to career plans. The participants saw exploration as meeting new people and having new experiences. The activities involved were mostly travelling and living away from home. Once the participants felt that their exploration was over, they then felt that they would make a career choice. For the fourth theme, the career choice was discussed in terms of having formed a stable career identity, which would allow them to think about other parts of their lives, such as a family. The last theme addressed in this thesis was emotions that were present in the participants’ narratives, which were fear and excitement. From these findings, it is my hope that we continue to study career development through the use of narrative methodology to be able to learn more about the adolescent experience.
Protoplanet Hunting With Alma Observations Of Molecular Emission
Creators: name: Cleeves, Ilse
Publisher: name: Zenodo
Year: 2016

description: Young, luminous protoplanets embedded in circumstellar disks directly heat their local environment. The accretion luminosity from the planet can sublimate ices in its immediate vicinity, creating a unique gas-phase signature in the parent disk. We modeled the 3D chemical structure induced by planet-heating and find the ice sublimation is detectable by ALMA, and will follow the planet in its orbit.
description: Ted Bergin - University of Michigan; Tim Harries - University of Exeter
Phronia willistoni Dziedzicki 1889
Creators: name: El Mouden, Mohamed Amin
name: Chandler, Peter J.
name: Saidoun, Imane
name: Driauach, Ouafaa
name: Belqat, Boutaïna
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Mycetophilidae
Phronia
Phronia willistoni

description: Phronia willistoni Dziedzicki, 1889
Material examined.
Morocco – Middle Atlas Region • 1 ♂; Forêt Bab Boudir; 19/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/24178.
North African distribution.
Morocco (Banamar et al. 2020).
description: Published as part of El Mouden, Mohamed Amin, Chandler, Peter J., Saidoun, Imane, Driauach, Ouafaa & Belqat, Boutaïna, 2025, A new species of Docosia Winnertz, 1864 and new records of fungus gnats (Diptera, Bolitophilidae, Keroplatidae and Mycetophilidae) from North Africa, pp. 349-379 in ZooKeys 1233 on pages 349-379, DOI: 10.3897/zookeys.1233.130502
The IHS Transformations Based Image Fusion
Creators: name: Al-Wassai, Firouz Abdullah
name: Kalyankar, N. V.
name: Al-Zuky, Ali A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The IHS sharpening technique is one of the most commonly used techniques for sharpening. Different transformations have been developed to transfer a color image from the RGB space to the IHS space. Through literature, it appears that, various scientists proposed alternative IHS transformations and many papers have reported good results whereas others show bad ones as will as not those obtained which the formula of IHS transformation were used. In addition to that, many papers show different formulas of transformation matrix such as IHS transformation. This leads to confusion what is the exact formula of the IHS transformation?. Therefore, the main purpose of this work is to explore different IHS transformation techniques and experiment it as IHS based image fusion. The image fusion performance was evaluated, in this study, using various methods to estimate the quality and degree of information improvement of a fused image quantitatively.
description: Image Fusion, Color Models, IHS, HSV, HSL, YIQ, transformations
ATP-driven Spatial Organization of a Carbon-fixing Organelle in Cyanobacteria
Creators: name: Hakim, Pusparanee Binti
Publisher: name: My University
Year: 2021
Subjects: subject: Subcellular organization
subject: Bacterial microcompartment
subject: Cyanobacteria
subject: ParA ATPase
subject: McdB
subject: Molecular, Cellular and Developmental Biology
subject: Science

description: Metabolic compartmentalization contributes to the spatiotemporal modulation of biochemical reactions within eukaryotic and prokaryotic cells. Bacterial microcompartments (BMCs) are widespread, self-assembling proteinaceous organelles that function by physically sequestering key metabolic enzymes essential in carbon source utilization, microbial ecology, and pathogenesis. A well-studied anabolic BMC, called the carboxysome, serves as a critical carbon-fixing organelle in cyanobacteria and many chemoautotrophs. Carboxysomes play a central role in the CO2-concentrating mechanism of these bacteria by compartmentalizing central photosynthetic enzymes, effectively increasing their efficiency, and preventing the occurrence of wasteful side reactions. The basic architecture of carboxysomes consists of multi-protein subunits that form a selectively permeable diffusion barrier, allowing gaseous and metabolic exchanges to take place. While eukaryotic organelles use cytoskeletal highways for their cellular organization, little is known about how bacteria spatially regulate their protein-based organelles for proper segregation, homeostasis, inheritance, and maintenance in a cell population. Fully assembled, mature carboxysomes are aligned equidistantly along the cell length to ensure faithful inheritance. Previous studies have implicated an important ParA-like protein we termed Maintenance of carboxysome distribution A (McdA) as a critical component in equal spacing of carboxysomes. McdA forms oscillating protein gradients over the nucleoid in response to its carboxysome-localized partner protein, McdB. Prior to my work, the mechanism driving McdA oscillations and carboxysome positioning by the McdAB system was unknown. To address this gap in knowledge I first examined the biochemical interaction between the two-component McdAB system and the nucleoid. I then dissected how the McdA ATPase cycle mediates the protein’s dynamic oscillatory patterning and carboxysome positioning. Finally, I demonstrate how multi-generational live-cell imaging of S. elongatus can serve as an indispensable tool in studying the mechanistic workings of carboxysome dynamics and inheritance. Together, this thesis work provides the first steps towards an understanding of the ATP-driven molecular mechanisms governing organelle trafficking in bacteria.
Thermal noise in optical cavities revisited
Creators: name: Kessler, Thomas
name: Legero, Thomas
name: Sterr, Uwe
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Thermal noise of optical reference cavities sets a fundamental limit to the frequency instability of ultra-stable lasers. Using Levin's formulation of the fluctuation-dissipation theorem we correct the analytical estimate for the spacer contribution given by Numata et al.. For detailed analysis finite-element calculations of the thermal noise focusing on the spacer geometry, support structure and the usage of different materials have been carried out. We find that the increased dissipation close to the contact area between spacer and mirrors can contribute significantly to the thermal noise. From an estimate of the support structure contribution we give guidelines for a low-noise mounting of the cavity. For mixed-material cavities we show that the thermal expansion can be compensated without deteriorating the thermal noise.
description: 8 pages, 8 figures, 3 tables, accepted for publication in JOSA B
It Came From South of The Border: Effects of the USA PATRIOT Act and More on Canadian Libraries
Creators: name: Waller, Andrew
Publisher: name: University of Calgary
Year: 2007
Subjects: subject: Library & Information Science
subject: USA PATRIOT Act
subject: OFAC
subject: Office of Foreign Assets Control
subject: Licensing
subject: Electronic products
subject: Canada
subject: Canadian libraries

description: This was presented at the Netspeed 2007 conference on October 18, 2007. The conference took place at the Carriage House Inn, Calgary, AB, October 17-19, 2007.
description: This presentation examined the effects of the USA PATRIOT Act on Canadian libraries along with other similar American actions, such as the rulings of the Department of the Treasury’s Office of Foreign Asset Controls (OFAC). In a time when libraries in Canada are spending increasingly large amounts of money on electronic products housed on servers located in the United States (or under the control of American subsidiaries), it is important to know how these databases and our use of them is impacted by American legislation and governmental activities. This session will look at what libraries and other organizations and jurisdictions in Canada are doing to deal with these problems.
Quantitative Spectroscopy of Blue Supergiant Stars in the Disk of M81: Metallicity, Metallicity Gradient and Distance
Creators: name: Kudritzki, R. -P.
name: Urbaneja, M. A.
name: Gazak, Z.
name: Bresolin, F.
name: Przybilla, N.
name: Gieren, W.
name: Pietrzynski, G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The quantitative spectral analysis of low resolution Keck LRIS spectra of blue supergiants in the disk of the giant spiral galaxy M81 is used to determine stellar effective temperatures, gravities, metallicities, luminosites, interstellar reddening and a new distance using the Flux-weighted Gravity--Luminosity Relationship (FGLR). Substantial reddening and extinction is found with E(B-V) ranging between 0.13 to 0.38 mag and an average value of 0.26 mag. The distance modulus obtained after individual reddening corrections is 27.7+/-0.1 mag. The result is discussed with regard to recently measured TRGB and Cepheid distances. The metallicities (based on elements such as iron, titanium, magnesium) are supersolar (~0.2 dex) in the inner disk (R<=5kpc) and slightly subsolar (~ -0.05 dex) in the outer disk (R>10 kpc) with a shallow metallicity gradient of 0.034 dex/kpc. The comparison with published oxygen abundances of planetary nebulae and metallicities determined through fits of HST color-magnitude diagrams indicates a late metal enrichment and a flattening of the abundance gradient over the last 5 Gyrs. This might be the result of gas infall from metal rich satellite galaxies. Combining these M81 metallicities with published blue supergiant abundance studies in the Local Group and the Sculptor Group a galaxy mass metallicity-relationship based solely on stellar spectroscopic studies is presented and compared with recent studies of SDSS star forming galaxies.
description: 60 pages, 17 figures, Accepted for publication by ApJ