cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Large Super-Fast Rotator Hunting Using the Intermediate Palomar Transient Factory
Creators: name: Chang, Chan-Kao
name: Lin, Hsing-Wen
name: Ip, Wing-Huen
name: Prince, Thomas A.
name: Kulkarni, Shrinivas R.
name: Levitan, David
name: Laher, Russ
name: Surace, Jason
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In order to look for large super-fast rotators, five dedicated surveys covering ~ 188 square degree in the ecliptic plane have been carried out in R-band with ~10 min cadence using the intermediate Palomar Transient Factory in late 2014 and early 2015. Among 1029 reliable rotation periods obtained from the surveys, we discovered one new large super-fast rotator, (40511) 1999 RE88, and other 18 candidates. (40511) 1999 RE88 is an S-type inner main-belt asteroid with a diameter of D = 1.9 +- 0.3 km, which has a rotation period of P = 1.96 +- 0.01 hr and a lightcurve amplitude of ~0.1 mag. To maintain such fast rotation, an internal cohesive strength of ~780 Pa is required. Combining all known large super-fast rotators, their cohesive strengths all fall in the range of 100 to 1000 Pa of lunar regolith. However, the number of large super-fast rotators seems to be far less than the whole asteroid population. This might indicate a peculiar asteroid group for them. Although the detection efficiency for a long rotation period is greatly reduced due to our two-day observation time span, the spin-rate distributions of this work show consistent results with Chang et al. (2015) after considering the possible observational bias in our surveys. It shows a number decrease with increase of spin rate for asteroids with diameter of 3 < D < 15 km, and a number drop at spin-rate of f = 5 rev/day for asteroids with D < 3 km.
description: Accepted by ApJS in Aug 2016. 33 pages (not include the full tables and figures). The full tables and figures for asteroid rotation periods will be available when the paper is officially published on ApJS
Rotons and their damping in elongated dipolar Bose-Einstein condensates
Creators: name: Matveenko, S. I.
name: Bahovadinov, M. S.
name: Baranov, M. A.
name: Shlyapnikov, G. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss finite temperature damping of rotons in elongated Bose-condensed dipolar gases, which are in the Thomas-Fermi regime in the tightly confined directions. The presence of many branches of excitations which can participate in the damping process, is crucial for the Landau damping and results in significant increase of the damping rate. It is found, however, that even rotons with energies close to the roton gap may remain fairly stable in systems with the roton gap as small as 1nK.
description: 8 pages, 4 figures, results of numerical calculations are added
The structure and stratigraphy of Penguin, central north Tasmania
Creators: name: Dousset, Jamie.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Global analysis of electroweak data in the Standard Model
Creators: name: de Blas, J.
name: Ciuchini, M.
name: Franco, E.
name: Goncalves, A.
name: Mishima, S.
name: Pierini, M.
name: Reina, L.
name: Silvestrini, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We perform a global fit of electroweak data within the Standard Model, using state-of-the art experimental and theoretical results, including a determination of the electromagnetic coupling at the electroweak scale based on recent lattice calculations. In addition to the posteriors for all parameters and observables obtained from the global fit, we present indirect determinations for all parameters and predictions for all observables. Furthermore, we present full predictions, obtained using only the experimental information on Standard Model parameters, and a fully indirect determination of Standard Model parameters using only experimental information on electroweak data. Finally, we discuss in detail the compatibility of experimental data with the Standard Model and find a global p-value of 0.5.
description: 11 pages, 4 tables, 3 figures
When Hope Grows Weary
Creators: name: Spencer-Laitt, Daniella
name: Weiss, Amanda
Publisher: name: Columbia Social Work Review
Year: 2020

description: Hopelessness is associated with suicidal ideation and completion, poor physical health, and poor quality of life, and is an important and little- discussed dimension of the experience of older adults. However, hopelessness is not an inevitable part of the aging process. The present paper analyzes theconstruct of hopelessness speci cally in the context of the aging population,discusses measuring and treating hopelessness, and makes recommendations, based on existing models of care, for how targeted services can be created to address this problem.
description: Columbia Social Work Review, Vol 18 No 1 (2020)
Converting entropy to curvature perturbations after a cosmic bounce
Creators: name: Fertig, Angelika
name: Lehners, Jean-Luc
name: Mallwitz, Enno
name: Wilson-Ewing, Edward
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study two-field bouncing cosmologies in which primordial perturbations are created in either an ekpyrotic or a matter-dominated contraction phase. We use a non-singular ghost condensate bounce model to follow the perturbations through the bounce into the expanding phase of the universe. In contrast to the adiabatic perturbations, which on large scales are conserved across the bounce, entropy perturbations can grow significantly during the bounce phase. If they are converted into adiabatic/curvature perturbations after the bounce, they typically form the dominant contribution to the observed temperature fluctuations in the microwave background, which can have several beneficial implications. For ekpyrotic models, this mechanism loosens the constraints on the amplitude of the ekpyrotic potential while naturally suppressing the intrinsic amount of non-Gaussianity. For matter bounce models, the mechanism amplifies the scalar perturbations compared to the associated primordial gravitational waves.
description: minor corrections, version published in JCAP
Embedding a critical point in a hadron to quark-gluon crossover equation of state
Creators: name: Kapusta, J. I.
name: Plumberg, C.
name: Welle, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Lattice QCD simulations have shown unequivocally that the transition from hadrons to quarks and gluons is a crossover when the baryon chemical potential is zero or small. Many model calculations predict the existence of a critical point at a value of the chemical potential where current lattice simulations are unreliable. We show how to embed a critical point in a smooth background equation of state so as to yield the critical exponents and critical amplitude ratios expected of a transition in the same universality class as the liquid-gas phase transition and the 3D Ising model. The resulting equation of state has parameters which may be inferred by hydrodynamic modeling of heavy ion collisions in the Beam Energy Scan II at the Relativistic Heavy Ion Collider or in experiments at other accelerators.
description: 4 pages, 4 figures
Addressing Communication Barriers Among Deaf Populations Who Use American Sign Language in Hearing-Centric Social Work Settings
Creators: name: Bai, Yunhe
name: Bruno, David
Publisher: name: Columbia Social Work Review
Year: 2020

description: The primary mission of social workers is to provide services to meet the needs of vulnerable populations, including people who are deaf and use American Sign Language (ASL). It is imperative for social workers to conduct culturally and linguistically competent practices to address deaf clients’ unique requirements. However, due to a shortage of competent social workers specializing in the deaf population, deaf people are likely to interact with hearing social workers who have insufficient knowledge of ASL, Deaf culture, and proper accommodations for deaf people. This paper explores core issues that impact deaf people’s access to social work services and urges that hearing social workers become familiar with the policies that protect the rights of clients with disabilities. Critical recommendations are offered to enhance access for deaf clients using ASL to more comprehensive social work services
description: Columbia Social Work Review, Vol 18 No 1 (2020)
Conceptualizing the Relationship Between Racism as a Psychosocial Stressor and the Disproportionate Rates of Schizophrenia Among Black Americans Using the Diathesis-Stress Model
Creators: name: Davis, Kashonda L.
Publisher: name: Columbia Social Work Review
Year: 2020

description: Schizophrenia is classified as one of the most debilitating mental health disorders due to the chronicity of symptoms and the magnitude of impairments in multiple domains of the individual’s life (Shetty & Bose, 2014). Research has consistently demonstrated that Black Americans, in comparison to other racial groups, have the highest prevalence rates of schizophrenia. With a paucity of empirical evidence ascertaining the etiology of schizophrenia, many scholars assert that elevated levels of stress play a critical role in the development of the disorder. This paper draws uponthe diathesis-stress model to elucidate a relationship between signi cantlevels of stress endured by Black Americans due to racism and their elevated rates of schizophrenia. The presented argument calls for further research on the impact of racism on Black Americans’ disproportionately high rates of schizophrenia diagnoses.
description: Columbia Social Work Review, Vol 18 No 1 (2020)
Seeding the Galactic Centre gas stream: gravitational instabilities set the initial conditions for the formation of protocluster clouds
Creators: name: Henshaw, J. D.
name: Longmore, S. N.
name: Kruijssen, J. M. D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Star formation within the Central Molecular Zone (CMZ) may be intimately linked to the orbital dynamics of the gas. Recent models suggest that star formation within the dust ridge molecular clouds (from G0.253+0.016 to Sgr B2) follows an evolutionary time sequence, triggered by tidal compression during their preceding pericentre passage. Given that these clouds are the most likely precursors to a generation of massive stars and extreme star clusters, this scenario would have profound implications for constraining the time-evolution of star formation. In this Letter, we search for the initial conditions of the protocluster clouds, focusing on the kinematics of gas situated upstream from pericentre. We observe a highly-regular corrugated velocity field in $\{l,\,v_{\rm LSR}\}$ space, with amplitude and wavelength $A=3.7\,\pm\,0.1$ kms$^{-1}$ and $λ_{\rm vel, i}=22.5\,\pm\,0.1$ pc, respectively. The extremes in velocity correlate with a series of massive ($\sim10^{4}$M$_{\odot}$) and compact ($R_{\rm eq}\sim2$ pc), quasi-regularly spaced ($\sim8$ pc), molecular clouds. The corrugation wavelength and cloud separation closely agree with the predicted Toomre ($\sim17$ pc) and Jeans ($\sim6$ pc) lengths, respectively. We conclude that gravitational instabilities are driving the condensation of molecular clouds within the Galactic Centre gas stream. Furthermore, we speculate these seeds are the historical analogue of the dust-ridge molecular clouds, representing the initial conditions of star and cluster formation in the CMZ.
description: 6 pages, 3 figures, 1 table. Accepted for publication in MNRAS Letters. Table values updated, conclusions unaffected
Religious Observance as a Tool for Domestic Violence in Custody Disputes Among Haredi Jewish Co-Parents
Creators: name: Kadish, Karen A.
Publisher: name: Columbia Social Work Review
Year: 2020

description: Domestic violence victims in Haredi Jewish communities face serious obstacles to leaving their abusers and escaping domestic violence. Leavingtheir abusers often entails divorce and erce custody disputes. For manyHaredi women who have experienced domestic violence, leaving their abusers also involves leaving their religious sect or even religious observance in general. This paper will explore the dynamics that contribute to these concerns for Haredi Jewish domestic violence survivors and address how courts deciding child custody can inadvertently perpetuate domestic violence. This paper will then recommend changing the courts’ analysis in child custody cases to a “friendly religious co-parent” model in order to better protect victims of domestic violence.
description: Columbia Social Work Review, Vol 18 No 1 (2020)
The Implications of Disproportionate Individualized Education Plan Classifications in New York City Schools
Creators: name: Cordell, Amanda
Publisher: name: Columbia Social Work Review
Year: 2020

description: Over- and under-representation of students of color within disabilityclassi cations is a nationwide phenomenon that has a major impact onstudents’ ability to thrive in school and is especially prevalent in New York City Department of Education schools. The present paper uses a Dis/Crit framework to analyze this phenomenon, revealing that disproportionalityof disability classi cation is a symptom of underlying racism and ableismin the education system. Despite the relatively recent addition of policy to address both racial and disability discrimination in schools, students continue to experience inequitable educational opportunity both because of their race and their ability.
description: Columbia Social Work Review, Vol 18 No 1 (2020)
A study of primitive fish fossils from the early cretaceous of Victoria, Australia, with comments on (primitive) lower actinopterygian
Creators: name: Inglis, Matthew Paul.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Topological chiral currents in the Gross-Neveu model extension
Creators: name: Tirrito, E.
name: Lewenstein, M.
name: Bermudez, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We unveil an interesting connection of Lorentz-violating quantum field theories, studied in the context of the standard model extension, and Hubbard-type models of topological crystalline phases. These models can be interpreted as a regularisation of the former and, as hereby discussed, explored with current quantum simulators based on ultra-cold atoms in optical Raman lattices. In particular, we present a complete analysis of the Creutz-Hubbard ladder under a generic magnetic flux, which regularises a Gross-Neveu model extension, and presents a characteristic circulating chiral current whose non-zero value arises from a specific violation of Lorentz invariance. We present a complete phase diagram with trivial insulators, ferromagnetic and anti-ferromagnetic phases, and current-carrying topological crystalline phases. These predictions are benchmarked using tools from condensed matter and quantum-information science, showing that self-consistent Hartree-Fock and strong-coupling Dzyaloshinskii-Moriya methods capture the essence of the phase diagram in different regimes, which is further explored using extensive numerical simulations based on matrix-product states.
Developmental Disability and Employment
Creators: name: Cox, Katie
Publisher: name: Columbia Social Work Review
Year: 2019

description: Americans with developmental and other disabilities are often excluded from society due to the assumption that they cannot or do not wish to work. This paper examines the possibilities for and benefits of creating jobs for persons with developmental disabilities through the lenses of policy, law, evidence-based practice and social work ethics. While different perspectives on this issue exist, it is important to reframe our assumptions about the employment of people who have developmental disabilities, taking our cues from these individuals, rather than personal, professional, or societal notions. These notions, if they frame people as unable to participate in our culture, can undermine the many achievements that those with disabilities have fought for in law and public perception. Including people with developmental disabilities in the workplace is beneficial to these individuals and society in a variety of ways. This paper provides an overview of some excellent models of how to create space for people with developmental disabilities who wish to be employed in the workplace and outlines reasons why this type of economic inclusion is essential in order for these individuals to be included in American society. As specialists in understanding the gap between society and those who are typically rejected from it, social workers are well positioned to find creative solutions for this problem.
description: Columbia Social Work Review, Vol 6 No 1 (2008)
Impurity states in the magnetic topological insulator V:(Bi,Sb)$_2$Te$_3$
Creators: name: Peixoto, Thiago R. F.
name: Bentmann, Hendrik
name: Schreyeck, Steffen
name: Winnerlein, Martin
name: Seibel, Christoph
name: Maaß, Henriette
name: Al-Baidhani, Mohammed
name: Treiber, Katharina
name: Schatz, Sonja
name: Grauer, Stefan
name: Gould, Charles
name: Brunner, Karl
name: Ernst, Arthur
name: Molenkamp, Laurens W.
name: Reinert, Friedrich
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The ferromagnetic topological insulator V:(Bi,Sb)$_2$Te$_3$ has been recently reported as a quantum anomalous Hall (QAH) system. Yet the microscopic origins of the QAH effect and the ferromagnetism remain unclear. One key aspect is the contribution of the V atoms to the electronic structure. Here the valence band of V:(Bi,Sb)$_2$Te$_3$ thin films was probed in an element-specific way by resonant photoemission spectroscopy. The signature of the V $3d$ impurity band was extracted, and exhibits a high density of states near Fermi level. First-principles calculations support the experimental results and indicate the coexistence of ferromagnetic superexchange and double exchange interactions. The observed impurity band is thus expected to contribute to the ferromagnetism via the interplay of different mechanisms.
description: 5 pages, 3 figures, figure 3 changed, new references and discussion included
Kompaneets Model Fitting of the Orion-Eridanus Superbubble II: Thinking Outside of Barnard's Loop
Creators: name: Pon, Andy
name: Ochsendorf, Bram B.
name: Alves, João
name: Bally, John
name: Basu, Shantanu
name: Tielens, Alexander G. G. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Orion star-forming region is the nearest active high-mass star-forming region and has created a large superbubble, the Orion-Eridanus superbubble. Recent work by Ochsendorf et al. has extended the accepted boundary of the superbubble. We fit Kompaneets models of superbubbles expanding in exponential atmospheres to the new, larger shape of the Orion-Eridanus superbubble. We find that this larger morphology of the superbubble is consistent with the evolution of the superbubble being primarily controlled by expansion into the exponential Galactic disk ISM if the superbubble is oriented with the Eridanus side farther from the Sun than the Orion side. Unlike previous Kompaneets model fits that required abnormally small scale heights for the Galactic disk (<40 pc), we find morphologically consistent models with scale heights of 80 pc, similar to that expected for the Galactic disk.
description: 8 pages, 3 figures, accepted by ApJ, minor grammatical changes
Poverty and Mental Health in the American Indian Community
Creators: name: Sealey, Larkin
Publisher: name: Columbia Social Work Review
Year: 2019

description: More than twenty-five percent of the US American Indian* population lives at or below the poverty line; unemployment is nearly ten percent higher than that of the general population (U.S. Census, 2006). On or near reservations, the numbers are much higher. American Indian youth commit suicide at a rate three times that of the general population, (Indian Health Services [IHS], 2001) while American Indians as a group have a higher mortality rate due to alcoholism than any other group in the US (Gray & Nye, 2001). The following will examine both the mental health and socioeconomic condition of this community in order to understand the ways in which the experience of poverty and the high rates of poor mental health might relate. There are a number of challenges facing the American Indian community; this paper will explore poverty as only one of the potential factors adding to the mental distress exhibited in the population. Poverty is defined from both an absolute and social exclusion perspective. The suggested influences on mental health include economic stress, sociohistorical trauma, and isolation from institutional resource.
description: Columbia Social Work Review, Vol 6 No 1 (2008)
Synthesis and electrochemistry of [Ru(bpy)₂L]0/+/2+ complexes
Creators: name: Pearson, Pauline.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
From Pericenter and Back: Full Debris Stream Evolution in Tidal Disruption Events
Creators: name: Bonnerot, Clément
name: Pessah, Martin E.
name: Lu, Wenbin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: When a star passes too close to a supermassive black hole, it gets disrupted by strong tidal forces. The stellar debris then evolves into an elongated stream of gas that partly falls back towards the black hole. We present an analytical model describing for the first time the full stream evolution during such a tidal disruption event (TDE). Our framework consists in dividing the stream into different sections of elliptical geometry, whose properties are independently evolved in their co-moving frame under the tidal, pressure, and self-gravity forces. Through an explicit treatment of the tidal force and the inclusion of the gas angular momentum, we can accurately follow the stream evolution near pericenter. Our model evolves the longitudinal stream stretching and both transverse widths simultaneously. For the latter, we identify two regimes depending on whether the dynamics is entirely dominated by the tidal force (ballistic regime) or additionally influenced by pressure and self-gravity (hydrostatic regime). We find that the stream undergoes transverse collapses both shortly after the stellar disruption and upon its return near the black hole, at specific locations determined by the regime of evolution considered. The stream evolution predicted by our model can be used to determine the subsequent interactions experienced by this gas that are at the origin of most of the electromagnetic emission from TDEs. Our results suggest that the accretion disk may be fed at a rate that differs from the standard fallback rate, which would provide novel observational signatures dependent on black hole spin.
description: 7 pages, 3 figures, accepted by ApJL
Provoking Discomfort
Creators: name: Ring, Andreas
Publisher: name: Columbia Social Work Review
Year: 2019

description: Triggered by differing responses of Columbia University School of Social Work students to a recent hate crime at neighboring Teachers College, this paper explores evidence that parts of the student body may, through lacking awareness of its own prejudiced tendencies, be acting out subtle racism and perpetuating the very ethnic divides that fuel racist aggression. The paper argues that fear and an underrepresentation of minority students impede the real dialogue necessary to overcome such aversive racism – but contends that the introspective and emotionally honest debate which has followed in the wake of the hate crime offers a window of opportunity for change. Steps need to be taken to build the self-reflection witnessed in ensuing forums into the school curriculum and ensure that all graduating students are similarly provoked to the necessary understanding of our individual role in sustaining or combating prejudice and segregation. Only in this manner can we hope to overcome racism as a whole and become the social work practitioners we aspire to be – capable of resolving the conflicts and tensions within us, as well as around us.
description: Columbia Social Work Review, Vol 6 No 1 (2008)
Rare radiative leptonic B-decays
Creators: name: Kozachuk, Anastasiia
name: Melikhov, Dmitri
name: Nikitin, Nikolai
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We obtain predictions for $B_{(s)}\to e^+e^-γ$ and $B_{(s)}\to μ^+μ^-γ$ decays. All the contributions containing long-distance QCD effects are calculated in the framework of relativistic quark model. The contributions of the light vector-meson resonances related to the virtual photon emission from valence quarks of the $B$-meson are included. The highest branching ratios for the radiative leptonic B-decays are ${\cal B}(\bar B^0_s\to e^+e^-γ)=18.8\times10^{-9}$ and ${\cal B}(B^0_s\to μ^+μ^-γ)=12.2\times10^{-9}$. We also give the distribution of the foward-backward asymmetry.
description: 8 pages, 11 figures, talk given at the 19th International Seminar on High Energy Physics QUARKS-2016, Pushkin, Russia, 29 May - 4 June, 2016
A chemoselective synthetic pathway to unsymmetrical bis(arylidene)alkanones and oligomeric compounds
Creators: name: Giarrusso, Marilena Antonina.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Designer Vaginas
Creators: name: Querna, Katherine
Publisher: name: Columbia Social Work Review
Year: 2019

description: The goal of creating the idealized female form is neither new nor novel. Women have been altering their bodies for centuries. However, the focus recently has come onto the vagina – the most culturally value-laden of anatomical parts. This paper seeks to explore how historical representations and contemporary perceptions of the vagina have shaped attitudes towards female genitalia, and why society has perpetuated the objectiﬁed, idealized female image and imposed that falsiﬁcation on the vagina. Additionally the author explores the practice of female genital cosmetic surgery (FGCS), potential impetus behind the increase in elective vagina surgeries, and the implications of FGCS for both the individual and broader society. Further the author hopes to examine implications for social work practice working in a society blanketed with the pernicious cultural message that in order for a woman to be accepted and feel adequate, she must attain the “perfect” physical form.
description: Columbia Social Work Review, Vol 6 No 1 (2008)
Equilibrium and non-equilibrium concentration fluctuations in a critical binary mixture
Creators: name: Giavazzi, Fabio
name: Fornasieri, Alessandro
name: Vailati, Alberto
name: Cerbino, Roberto
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: When a macroscopic concentration gradient is present across a binary mixture, long-ranged non-equilibrium concentration fluctuations (NCF) appear as a consequence of the coupling between the gradient and spontaneous equilibrium velocity fluctuations. Long-ranged equilibrium concentration fluctuations (ECF) may be also observed when the mixture is close to a critical point. Here we study the interplay between NCF and critical ECF in a near critical mixture aniline/cyclohexane in the presence of a vertical concentration gradient. To this aim, we exploit a commercial optical microscope and a simple, custom-made, temperature-controlled cell to obtain simultaneous static and dynamic scattering information on the fluctuations. We first characterise the critical ECF at fixed temperature $T$ above the upper critical solution temperature $T_{c}$, in the wide temperature range $T-T_{c}\in[0.1,30]$ $^{o}$C. In this range, we observe the expected critical scaling behaviour for both the scattering intensity and the mass diffusion coefficient and we determine the critical exponents $γ$, $ν$ and $η$, which are found in agreement with the 3D Ising values. We then study the system in the two-phase region ($TT_{i}$. During the transient, a vertical diffusive mass flux is present that causes the onset of NCF, whose amplitude vanishes with time, as the flux goes to zero. We also study the time dependence of the equilibrium scattering intensity $I_{eq}$, of the crossover wave-vector $q_{co}$ and of the diffusion coefficient $D$ during diffusion and find that all these quantities exhibit an exponential relaxation enslaved to the diffusive kinetics.
description: 11 pages, 4 figures
Hitting two BSM particles with one lepton-jet: search for a top partner decaying to a dark photon, resulting in a lepton-jet
Creators: name: Plessis, K. du
name: Flores, M. M.
name: Kar, D.
name: Sinha, S.
name: van der Schyf, H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A maverick top partner model, decaying to a dark photon was suggested. The dark photon decays to two overlapping electrons for dark photon masses of $\approx 100$ GeV, and results in a so-called lepton-jet. The event includes a top quark as well, which results in events with two boosted objects, one heavy and the other light. We propose a search strategy exploiting the unique signal topology. We show that for a set of kinematic selections, both in hadronic and leptonic decay channel of the SM top quark, almost all background can be eliminated, leaving enough signal events up to top partner mass of about 3 TeV for the search to be viable at the LHC.
description: Prepared for submission to SciPost Physics (updated in response to referee report)
Running Vacuum Cosmological Models: Linear Scalar Perturbations
Creators: name: Perico, E. L. D.
name: Tamayo, D. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In cosmology, phenomenologically motivated expressions for running vacuum are commonly parametrized as linear functions $Λ(H^2)$ or $Λ(R)$. Such kind of models assume an equation of state for vacuum given by $\,\overline P_Λ=-\,\overlineρ_Λ$, relating their background pressure $\,\overline P_Λ$ and mean energy density $\,\overlineρ_Λ\equivΛ/8πG$. This equation of state requires that the dynamic for vacuum is due to the energy exchange with the material species. Most of the approaches to background level consider only the energy exchange between vacuum and the transient dominant material component of the universe. We extend such models assuming the running vacuum as the sum of independent contributions $\,\overlineρ_Λ =\sum_i\,\overlineρ_{Λi}$, associated with (and interacting with) each of the $i$ material species. We derive the linear scalar perturbations for two running scenarios, modeling its cosmic evolution and identifying their different imprints on the cosmic microwave background anisotropies and the matter power spectrum. In the $Λ(H^2)$ scenario the running vacuum are coupled with all the material species in the universe, whereas the $Λ(R)$ description only leads to coupling between vacuum and the non-relativistic matter components; which produces different imprints of the two models on the matter power spectrum. A comparison with the Planck 2015 data was made in order to constrain the free parameters of the models. In the case of the $Λ(H^2)$ model, it was found that $Ω_Λ=0.705\pm0.027$ and $H_0=69.6\pm2.9\, km\, Mpc^{-1}\, s^{-1}$, which diminish the tension with the low redshift expectations.
description: 34 pages, 11 figures
A random energy approach to deep learning
Creators: name: Xie, Rongrong
name: Marsili, Matteo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We study a generic ensemble of deep belief networks which is parametrized by the distribution of energy levels of the hidden states of each layer. We show that, within a random energy approach, statistical dependence can propagate from the visible to deep layers only if each layer is tuned close to the critical point during learning. As a consequence, efficiently trained learning machines are characterised by a broad distribution of energy levels. The analysis of Deep Belief Networks and Restricted Boltzmann Machines on different datasets confirms these conclusions.
description: 16 pages, 4 figures
Stability and Hopf bifurcation analysis for the hypothalamic-pituitary-adrenal axis model with memory
Creators: name: Kaslik, Eva
name: Neamtu, Mihaela
Publisher: name: arXiv
Year: 2016
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: This paper generalizes the existing minimal model of the hypothalamic-pituitary-adrenal (HPA) axis in a realistic way, by including memory terms: distributed time delays, on one hand and fractional-order derivatives, on the other hand. The existence of a unique equilibrium point of the mathematical models is proved and a local stability analysis is undertaken for the system with general distributed delays. A thorough bifurcation analysis for the distributed delay model with several types of delay kernels is provided. Numerical simulations are carried out for the distributed delays models and for the fractional-order model with discrete delays, which substantiate the theoretical findings. It is shown that these models are able to capture the vital mechanisms of the HPA system.
description: 29 pages
Exactly solvable model of a passive Brownian heat engine and its comparison with active engines
Creators: name: Majumdar, Rita
name: Saha, Arnab
name: Marathe, Rahul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We perform an extensive analysis of passive as well as active micro-heat engines with different single-particle stochastic models. Using stochastic thermodynamics we calculate thermodynamic work, heat, entropy production and efficiency of passive and active Brownian heat engines analytically as well as numerically and compare them. We run the heat engines with a protocol for which the average thermodynamic quantities are calculated exactly for an arbitrary cycle time. We also discuss about the group of protocols for which exact non-quasistatic calculations can be done, completely in the passive engine case and partially in the active engines. We obtain detailed thermodynamics of non-quasistatic (i.e. powerful) single-particle micro heat engines. The quasistatic (i.e. zero power) limit of the results is obtained by taking long (infinite) cycle time. We also study the distributions of position of the confined particle in both passive and active engines. We compare their characteristics in terms of the parameter that measures the competition between the active persistence in the particle position (due to active noises) and the harmonic confinement. We also calculate excess kurtosis that measures the non-Gaussianity of these distributions. Our analysis shows that efficiency of such thermal machine can be enhanced or reduced depending on the activity present in the model.
description: 31 pages, 19 figures
Alaiz Experiment (ALEX17): Campaign and Data Report
Creators: name: Cantero, Elena
name: Borbón Guillén, Fernando
name: Sanz Rodrigo, Javier
name: Santos, Pedro
name: Mann, Jakob
name: Vasiljević, Nikola
name: Courtney, Michael
name: Martínez Villagrasa, Daniel
name: Martí, Belén
name: Cuxart, Joan
Publisher: name: Zenodo
Year: 2019
Subjects: wind energy
boundary-layer meteorology
LIDAR
wind resource assessment
atmospheric turbulence
complex terrain

description: This report ALEX17, the acronym for ALaiz EXperiment 2017, is the last full-scale experiment within the NEWA (New European Wind Atlas) project, whose primary objective is to create a wind atlas of Europe that includes the state-of-the-art in modelling the wind resource, as well as the creation of a comprehensive database. ALEX17 aims to present a utility-scale measurements campaign to characterize the wind flow in complex terrain, through a combination of measurement technologies. Having finalized the measurements campaign and processed all the information, the wind flow in the area of study can be characterized for different weather conditions. In addition, the experimental data will be able to validate the reliability of numeric simulation models of wind flow in complex terrain, in order to reduce uncertainties when evaluating the wind resource.
Seismic interpretation and basin analysis of the central onshore Otway Basin
Creators: name: Crockett, Tim.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
International Social Work in Practice
Creators: name: Pesso, Lauren
Publisher: name: Columbia Social Work Review
Year: 2019

description: International social work is gaining recognition as a distinct field of study and practice, and in this process, its meaning continues to be delineated. In this paper, I describe a series of experiences during a summer field practicum coordinating the final phase of a year-long qualitative research study on sexual and gender-based violence (SGBV) in Lira, northern Uganda. While not a conclusive statement on the nature of all international social work, this paper presents personal experiences to illustrate how the psychosocial skills, practices, and theory of the social work profession can lend themselves well to the emotional and managerial demands of international work in a post-conflict, developing country context.
description: Columbia Social Work Review, Vol 7 No 1 (2009)
A density functional theory investigation of charge mobility in titanyl-phthalocyanines and their tailored peripherally substituted complexes
Creators: name: De Lile, Jeffrey R.
name: Zhou, Su
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Titanyl-phthalocyanines catalytic ability towards oxygen reduction is demonstrated in experimental literature. Our recent theoretical simulations revealed electronic structure origin of catalytic ability in peripherally and axially substituted triplet and singlet titanyl-phthalocyanines. However, the origin of high electron transfer ability to spontaneously reduce peroxide in chlorine substituted singlet complex and triplet state Ti(II)Pc complexes remain elusive. Thus, we performed density functional theory calculations to study Ti(IV)Pc and their tailored peripheral substituted complexes as representative compounds of titanyl-phthalocyanines for charge mobilities, reorganization energies and electronic couplings. In addition, oxo(phthalocyaninato)titanium(IV) (TiOPc) convex and concave compounds were investigated to benchmark the method. Based on the results, Reorganization energies of triplet state Ti(II)Pc and their tailored peripheral substituted complexes are compared with Ti(IV)Pc singlet complexes in order to understand the charge mobility. Chlorine substituted complex demonstrates higher electron hopping rate due to higher electronic coupling in comparison to other halogens. Similarly, weak electron-donating methyl group increases the electron transport rate. Moreover, halogen substituted Ti(II)Pc complexes elucidate lower reorganization energies. The lowest reorganization energy is predicted for chlorine substituted Ti(II)Pc complex, which is 0.09 eV. Therefore, higher electronic coupling and lower reorganization energies can be considered as the origin of higher electron transfer ability of these complexes. Furthermore, increase electron hopping rate due to weak electron-donating substituents provide a method to produce efficient n-channel organic field-effect transistors with higher electron mobility.
description: 10 pages, 4 Figures
Modelling and computational improvements to the simulation of single vector-boson plus jet processes for the ATLAS experiment
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This paper presents updated Monte Carlo configurations used to model the production of single electroweak vector bosons (W, Z/$γ^{*}$) in association with jets in proton-proton collisions for the ATLAS experiment at the Large Hadron Collider. Improvements pertaining to the electroweak input scheme, parton-shower splitting kernels and scale-setting scheme are shown for multi-jet merged configurations accurate to next-to-leading order in the strong and electroweak couplings. The computational resources required for these set-ups are assessed, and approximations are introduced resulting in a factor three reduction of the per-event CPU time without affecting the physics modelling performance. Continuous statistical enhancement techniques are introduced by ATLAS in order to populate low cross-section regions of phase space and are shown to match or exceed the generated effective luminosity. This, together with the lower per-event CPU time, results in a 50% reduction in the required computing resources compared to a legacy set-up previously used by the ATLAS Collaboration. The set-ups described in this paper will be used for future ATLAS analyses and lay the foundation for the next generation of Monte Carlo predictions for single vector-boson plus jets production.
description: 59 pages in total, author list starting page 44, 15 figures, 3 tables, published in JHEP 08 (2022) 089. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PMGR-2021-01/
Speaking Truth to Power
Creators: name: Worley, Tracee
Publisher: name: Columbia Social Work Review
Year: 2019

description: The development of a professional social work identity involves being socialized into the history, mission, values, and ethics of the profession – learning what social workers can say and do. This socialization also corresponds with a silence about the limits and philosophical extremities of the profession – what social workers do not, perhaps cannot, say. Drawing from social theorist Michel Foucault’s analysis of subjectivity, power, knowledge, and discourse, this article aims to articulate the limits of the social work profession. By examining the historical and contemporary invention of the “social worker” and the “client,” I challenge social workers to consider the work that must be conducted upon themselves.
description: Columbia Social Work Review, Vol 7 No 1 (2009)
A Social Exclusion Perspective on Social Work in Latin America
Creators: name: Bacher, Andrea Laura
Publisher: name: Columbia Social Work Review
Year: 2019

description: This paper explores the relationship between social work and social exclusion within the context of poverty as capability deprivation. It suggests that a social exclusion perspective could be relevant and useful to social work theory and practice in Latin America. The Chile Solidario Program is used as an example of a social program that incorporates a social exclusion perspective and in which social workers play a vital role in promoting social inclusion.
description: Columbia Social Work Review, Vol 7 No 1 (2009)
Ecological and physical responses to large woody debris reintroduction in the Little Yarra River, Victoria, Australia
Creators: name: Coleman, Rhys.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Fencing Fears
Creators: name: Scott, Jen
Publisher: name: Columbia Social Work Review
Year: 2019

description: The October 2006 Secure Fence Act permitted the construction of over 700 miles of double reinforced fence along the United States-Mexico border. While perhaps not the one intended, the fence is having an impact: the death of migrants attempting to cross the border has increased and the construct of “illegality” is being reified, heightening the insecurity of individuals who live in the U.S. with illegal or undocumented status. In addition, the fence can be understood as a statement of exclusion that leads to the further erosion of societal unity among the people who live within the U.S. borders. This paper contextualizes the political discourse that presumes that the construction of a wall is a viable solution to national concerns about migration and security in the history of cross-border migration and legislation. In so doing it analyzes the fence by delineating its effects on undocumented migrants and the power imbalances already evident within the larger U.S. society. Finally, it concludes by asking social workers to act in accordance with their obligation to promote social justice.
description: Columbia Social Work Review, Vol 7 No 1 (2009)