cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
State and the migration industry in Indonesia: legal and institutional reforms and the protection of migrant workers
Creators: name: Sinaga, Irwan
Publisher: name: The Australian National University
Year: 2012
Subjects: subject: HD8708.5.A2 S56 2012
subject: Foreign workers Government policy Indonesia
subject: Indonesia Emigration and immigration
subject: Indonesia Politics and government

description: The central finding of this dissertation can be simply stated: more state policies and more institutions do not mean better protection for vulnerable migrant workers in Indonesia. To understand this further, I explore the nexus between the international migration of workers and the role of the Indonesian state and the migration industry. Scholars and practitioners need to know the constellation of interests, values, and institutions of state organisations, which operate at both the national and local levels. Actors in different institutions and at different levels of those institutions compete to advance their interests rather than those of the migrant workers, and help to bring about the failure of the state's attempts to protect workers and bring about reform in the migration sector. Apart from presenting detailed empirical evidence regarding the on-the-ground operation of the migration processes, the thesis rethinks the concept of the migration industry in the theoretical literature on international migration studies and thus to sharpen academic conceptualisations of Indonesia's migration industry. It argues that state can become part of the migration industry by blurring the delineation between meso and macro structures relating to the state in managing worker migration. The financial motives behind the state's involvement in the migration industry can be greater when such migration is legal rather than illicit. For-profit gain and social relations drive the production of migration in Indonesia. Closely scrutinising the details of the many stages of processing migrants, including predeparture, departure and post-departure is crucial to understanding better the connection between the migration industry and the state's profit-seeking role. Because the state becomes part of the migration industry, its role in promoting vigorously the export of workers undercuts its willingness to protect workers and monitor the migration process, resulting in migrant exploitation. Shadow state networks and corruption constantly hinder attempts to reform the migration industry. Political factors, including money raising and ignorance of worker exploitation by legislators, is a major factor in explaining the seemingly intractable nature of the present problems.
Soil Erodibility for Water Pollution Management of Melaka Watershed in Peninsular Malaysia
Creators: name: Md. Ibrahim Adham
name: Shirazi, Sharif Moniruzzaman
name: Othman, Faridah
name: Noorul Hassan Zardari
name: Zulkifli Yusop
name: Zubaidah Ismail
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2015
Subjects: soil erodibility,surface runoff,Tew equation,Melaka watersheds.

description: 2, 8, EnvironmentAsia
Scalar waves in a wormhole topology
Creators: name: Bugdayci, Necmi
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Global monochromatic solutions of the scalar wave equation are obtained in flat wormholes of dimensions 2+1 and 3+1. The solutions are in the form of infinite series involving cylindirical and spherical wave functions and they are elucidated by the multiple scattering method. Explicit solutions for some limiting cases are illustrated as well. The results presented in this work constitute instances of solutions of the scalar wave equation in a spacetime admitting closed timelike curves.
description: 24 pages, 8 figures
Characterization, deployment, and in-flight performance of the BLAST-TNG cryogenic receiver
Creators: name: Lowe, Ian
name: Ade, Peter A. R.
name: Ashton, Peter C.
name: Austermann, Jason E.
name: Coppi, Gabriele
name: Cox, Erin G.
name: Devlin, Mark J.
name: Dober, Bradley J.
name: Fanfani, Valentina
name: Fissel, Laura M.
name: Galitzki, Nicholas
name: Gao, Jiansong
name: Gordon, Samuel
name: Groppi, Christopher E.
name: Hilton, Gene C.
name: Hubmayr, Johannes
name: Klein, Jeffrey
name: Li, Dale
name: Lourie, Nathan P.
name: Mani, Hamdi
name: Mauskopf, Philip
name: McKenney, Christopher
name: Nati, Federico
name: Novak, Giles
name: Pisano, Giampaolo
name: Romualdez, L. Javier
name: Soler, Juan D.
name: Sinclair, Adrian
name: Tucker, Carole
name: Ullom, Joel
name: Vissers, Michael
name: Wheeler, Caleb
name: Williams, Paul A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Next Generation Balloon-borne Large Aperture Submillimeter Telescope (BLAST-TNG) is a submillimeter polarimeter designed to map interstellar dust and galactic foregrounds at 250, 350, and 500 microns during a 24-day Antarctic flight. The BLAST-TNG detector arrays are comprised of 918, 469, and 272 MKID pixels, respectively. The pixels are formed from two orthogonally oriented, crossed, linear-polarization sensitive MKID antennae. The arrays are cooled to sub 300mK temperatures and stabilized via a closed cycle $^3$He sorption fridge in combination with a $^4$He vacuum pot. The detectors are read out through a combination of the second-generation Reconfigurable Open Architecture Computing Hardware (ROACH2) and custom RF electronics designed for BLAST-TNG. The firmware and software designed to readout and characterize these detectors was built from scratch by the BLAST team around these detectors, and has been adapted for use by other MKID instruments such as TolTEC and OLIMPO. We present an overview of these systems as well as in-depth methodology of the ground-based characterization and the measured in-flight performance.
description: Presented at SPIE Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, December 13-18, 2020
Investigation of Mercury Vapor Treatment by Activated Carbon Made from Coconut Shell and Denatured by Elemental Bromine
Creators: name: Con, Tran Hong
name: QuangTrung, Do
name: Thao, Phuong
name: Loan, Dong Kim
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2015
Subjects: brominated activated carbon,mercury vapor adsorption

description: 2, 8, EnvironmentAsia
Cosmology and Cosmogony in a Cyclic Universe
Creators: name: Narlikar, Jayant V.
name: Burbidge, Geoffrey
name: Vishwakarma, R. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we discuss the properties of the quasi-steady state cosmological model (QSSC) developed in 1993 in its role as a cyclic model of the universe driven by a negative energy scalar field. We discuss the origin of such a scalar field in the primary creation process first described by F. Hoyle and J. V. Narlikar forty years ago. It is shown that the creation processes which takes place in the nuclei of galaxies are closely linked to the high energy and explosive phenomena, which are commonly observed in galaxies at all redshifts. The cyclic nature of the universe provides a natural link between the places of origin of the microwave background radiation (arising in hydrogen burning in stars), and the origin of the lightest nuclei (H, D, He$^3$ and He$^4$). It also allows us to relate the large scale cyclic properties of the universe to events taking place in the nuclei of galaxies. Observational evidence shows that ejection of matter and energy from these centers in the form of compact objects, gas and relativistic particles is responsible for the population of quasi-stellar objects (QSOs) and gamma-ray burst sources in the universe. In the later parts of the paper we briefly discuss the major unsolved problems of this integrated cosmological and cosmogonical scheme. These are the understanding of the origin of the intrinsic redshifts, and the periodicities in the redshift distribution of the QSOs.
description: 51 pages including 1 figure
Neutrino flavor oscillations without flavor states
Creators: name: Torres, Bruno de S. L.
name: Perche, T. Rick
name: Landulfo, André G. S.
name: Matsas, George E. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the problem of neutrino oscillations via a fermionic particle detector model inspired by the physics of the Fermi theory of weak interactions. The model naturally leads to a description of emission and absorption of neutrinos in terms of localized two-level systems. By explicitly including source and detector as part of the dynamics, the formalism is shown to recover the standard results for neutrino oscillations without mention to "flavor states", which are ill defined in quantum field theory. This illustrates how particle detector models provide a powerful theoretical tool to approach the measurement issue in quantum field theory and emphasizes that the notion of flavor states, although sometimes useful, must not play any crucial role in neutrino phenomenology.
description: 10 pages, 3 figures. V2 updated to match published version
title: Contemporary feminist adaptations of Greek myth
Creators: name: Judge, Shelby Elizabeth Helen
Publisher: name: University of Glasgow
Year: 2022

description: This project primarily addresses why there has been such expansion of interest among women writers in adapting and retelling classical mythology, and what this work reveals about current issues and priorities within feminism and feminist theory. It is my contention that the recent literary vogue for women’s revisionist myth writing reveals much about current concerns within feminism as well as trends within contemporary women’s writing. The scope of this thesis is as follows: it begins with the publication of Margaret Atwood’s The Penelopiad (2005) for the Canongate Myth Series, which I propose to be the mainspring of the current trend in women’s writing to adapt myth, and ends with relevant novels published in 2021. Notable authors within this study include Jeanette Winterson, Ali Smith, Pat Barker, Natalie Haynes, Madeline Miller, and Ursula Le Guin. This thesis utilises a methodology of feminist literary criticism, while also incorporating feminist work in classical studies and, where relevant, in the disciplines of Sociology and Women’s Studies. The ‘Literature Review’ takes as its starting point foundational work within feminist classical scholarship, before moving on to argue that non-traditional literature (mainly women’s myth writing for general audiences, podcasts, and online articles) are essential in order to contextualise the current critical climate of women in Classics. The subsequent five chapters are ‘Women in the Texts’, ‘Antigone’s Afterlives’, ‘Mythic Masculinities’, ‘Queering Myth’, and ‘“I want to tell the story again”: Palimpsests: Paratexts, and Intertexts’. Each chapter organises texts around specific concerns in contemporary feminism while also noting the variety of writing styles and techniques which reflect wider contemporary women’s writing practices.
ELEVATING CRITICAL THINKING WITH EFFICIENT TEACHING METHODS (GEARED TOWARDS MEDICAL STUDENTS)
Creators: name: Djalilova, Zarnigor
Publisher: name: Zenodo
Year: 2024

description: This article explores the pivotal role of questioning as a refined skill within the realm of pedagogy, investigating its profound influence on the enhancement of critical thinking abilities in learners. Through an examination of pedagogical methods that prove effective, the research sheds light on the intricacies involved in formulating and presenting questions designed to inspire inquiry, promote deeper comprehension, and foster the capacity for critical thought. Leveraging educational theories and practical insights, the paper delivers a thorough examination of the art of questioning as a transformative pedagogical instrument crucial for nurturing the intellectual capabilities of students.
Grußwort des Metropoliten von Minsk und Weißrußland Filaret anläßlich der 1000-Jahr-Feier der Taufe der Rus in Hannover
Creators: name: Filaret, Vachromeev
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 37 Nr. 2 (1988): Ökumenische Rundschau, Band 37, Heft 2
The Quantum Darboux Theorem,
Creators: name: Corradini, Olindo
name: Latini, Emanuele
name: Waldron, Andrew
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: Symplectic Geometry (math.SG)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The problem of computing quantum mechanical propagators can be recast as a computation of a Wilson line operator for parallel transport by a flat connection acting on a vector bundle of wavefunctions. In this picture the base manifold is an odd dimensional symplectic geometry, or quite generically a contact manifold that can be viewed as a "phase-spacetime", while the fibers are Hilbert spaces. This approach enjoys a "quantum Darboux theorem" that parallels the Darboux theorem on contact manifolds which turns local classical dynamics into straight lines. We detail how the quantum Darboux theorem works for anharmonic quantum potentials. In particular, we develop a novel diagrammatic approach for computing the asymptotics of a gauge transformation that locally makes complicated quantum dynamics trivial.
description: 27 pages, many figures, LaTeX, references added
Grußbotschaft der Evangelischen Kirche in Deutschland zur 1000-Jahr-Feier der Taufe Rußlands
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 37 Nr. 2 (1988): Ökumenische Rundschau, Band 37, Heft 2
Discourse of exclusion: AIDS education for women in Metro-Vancouver
Creators: name: Williams, Cherie
Publisher: name: University of British Columbia
Year: 2009

description: This thesis examines the evolution of HIV/ AIDS education for women in metro- Vancouver. The research focuses on two questions, "What AIDS education programs for women currently exist in Vancouver?" and "How effective has AIDS prevention education for women been?" Since the reported incidence of HIV/ AIDS continues to rise, the latter question leads to a further issue, "Why have some women been excluded from the HIV/ AIDS discourse? I chose to investigate these issues from a socialist feminist perspective. This perspective, which focuses on women's position within the economy, society, and family, guided my analysis of information I gathered from a variety of sources. These included both primary and secondary sources, namely: brochures; magazines; newspapers; television reports; journals; books; presentations; and interviews. The findings of the research reveal that, at the onset, preventative educational strategies did not exist for metro-Vancouver women because the gendering of the AIDS epidemic rendered women invisible. Since subsequent AIDS education focussed on "risk groups" rather than risk behaviors, many women who do not belong to a "risk group" still believe that they are not at risk. Consequently, gender appropriate strategies for AIDS prevention education need to be further developed. As well, these strategies are only one part of the solution. Belief systems, social scripting, and perceptions of one's self and others are the more challenging and difficult pieces to change, as are the underlying root causes of drug addiction and promiscuity.
Bounds on GUP parameters from GW150914 and GW190521
Creators: name: Das, Ashmita
name: Das, Saurya
name: Mansour, Noor R.
name: Vagenas, Elias C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute bounds on the GUP parameters for two versions of GUP using gravitational wave data from the events GW150914 and GW190521. The speed of the graviton and photon are calculated in a curved spacetime modified by GUP, assuming that these particles have a small mass. The observational bound on the difference in their speeds translates to bounds on the GUP parameters. These bounds are some of the best obtained so far in the context of quantum gravity phenomenology.
description: v1:14 pages, RevTeX, no figures; v2: 16 pages, RevTex, no figures, minor comments added, no physics changed, to appear in PLB
Stable Propagation of a Burst Through a One-Dimensional Homogeneous Excitatory Chain Model of Songbird Nucleus HVC
Creators: name: Li, Meng-Ru
name: Greenside, Henry
Publisher: name: arXiv
Year: 2006
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: We demonstrate numerically that a brief burst consisting of two to six spikes can propagate in a stable manner through a one-dimensional homogeneous feedforward chain of non-bursting neurons with excitatory synaptic connections. Our results are obtained for two kinds of neuronal models, leaky integrate-and-fire (LIF) neurons and Hodgkin-Huxley (HH) neurons with five conductances. Over a range of parameters such as the maximum synaptic conductance, both kinds of chains are found to have multiple attractors of propagating bursts, with each attractor being distinguished by the number of spikes and total duration of the propagating burst. These results make plausible the hypothesis that sparse precisely-timed sequential bursts observed in projection neurons of nucleus HVC of a singing zebra finch are intrinsic and causally related.
description: 13 pages, 6 figures
The ReadoutCard userspace driver for the new ALICE $O^2$ computing system
Creators: name: Alexopoulos, Konstantinos
name: Costa, Filippo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The ALICE (A Large Ion Collider Experiment) experiment focuses on the study of the quark-gluon plasma as a product of heavy-ion collisions at the CERN LHC (Large Hadron Collider). During the Long Shutdown 2 of the LHC in 2019-2020, a major upgrade is underway in order to cope with a hundredfold input data rate increase with peaks of up to 3.4 TB/s. This upgrade includes the new Online-Offline computing system called O2. The O2 readout chain runs on commodity Linux servers equipped with custom PCIe FPGA-based readout cards; the PCIe v3 x16, Intel Arria 10-based CRU (Common Readout Unit) and the PCIe v2 x8, Xilinx Vertex6-based CRORC (Common ReadOut Receiver Card). Access to the cards is provided through the O2 ReadoutCard userspace driver which handles synchronisation and communication for DMA transfers, provides BAR access, and facilitates card configuration and monitoring. The ReadoutCard driver is the lowest-level interface to the readout cards within O2 and is in use by all central systems and detector teams of the ALICE experiment. This communication presents the architecture of the driver, and the suite of tools used for card configuration and monitoring. It also discusses its interaction with the tangent subsystems within the O2 framework.
description: 7 pages, 9 figures, Proceedings of 22nd Virtual IEEE RealTime Conference, 12-24 October 2020
Pure spin photocurrents in low-dimensional structures
Creators: name: Tarasenko, S. A.
name: Ivchenko, E. L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: As is well known the absorption of circularly polarized light in semiconductors results in optical orientation of electron spins and helicity-dependent electric photocurrent, and the absorption of linearly polarized light is accompanied by optical alignment of electron momenta. Here we show that the absorption of unpolarized light leads to generation of a pure spin current, although both the average electron spin and electric current vanish. We demonstrate this for direct interband and intersubband as well as indirect intraband (Drude-like) optical transitions in semiconductor quantum wells (QWs).
description: 4 pages, 3 figures
Anti-Lambda polarization in high energy pp collisions with polarized beam
Creators: name: Xu, Qing-hua
name: Liang, Zuo-tang
name: Sichtermann, Ernst
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the polarization of the anti-Lambda particle in polarized high energy pp collisions at large transverse momenta. The anti-Lambda polarization is found to be sensitive to the polarization of the anti-strange sea of the nucleon. We make predictions using different parameterizations of the polarized quark distribution functions. The results show that the measurement of longitudinal anti-Lambda polarization can distinguish different parameterizations, and that similar measurements in the transversely polarized case can give some insights into the transversity distribution of the anti-strange sea of nucleon.
description: 11 pages, 4 figures
Phase space flows for non-Hamiltonian systems with constraints
Creators: name: Sergi, Alessandro
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this paper, non-Hamiltonian systems with holonomic constraints are treated by a generalization of Dirac's formalism. Non-Hamiltonian phase space flows can be described by generalized antisymmetric brackets or by general Liouville operators which cannot be derived from brackets. Both situations are treated. In the first case, a Nosé-Dirac bracket is introduced as an example. In the second one, Dirac's recipe for projecting out constrained variables from time translation operators is generalized and then applied to non-Hamiltonian linear response. Dirac's formalism avoids spurious terms in the response function of constrained systems. However, corrections coming from phase space measure must be considered for general perturbations.
"Erfahrung" - ein Streitpunkt im ökumenischen Gespräch
Creators: name: Kröger, Wolfgang
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 37 Nr. 2 (1988): Ökumenische Rundschau, Band 37, Heft 2
Radio Wavelength Transients: Current and Emerging Prospects
Creators: name: Lazio, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Known classes of radio wavelength transients range from the nearby--stellar flares and radio pulsars--to the distant Universe--γ-ray burst afterglows. Hypothesized classes of radio transients include analogs of known objects, e.g., extrasolar planets emitting Jovian-like radio bursts and giant-pulse emitting pulsars in other galaxies, to the exotic, prompt emission from γ-ray bursts, evaporating black holes, and transmitters from other civilizations. A number of instruments and facilities are either under construction or in early observational stages and are slated to become available in the next few years. With a combination of wide fields of view and wavelength agility, the detection and study of radio transients will improve immensely.
description: to appear in proceedings of Hot-wiring the Transient Universe, 2008 March issue of Astronomische Nachrichten
Polarized Neutron Inelastic Scattering Study of the Anisotropic Magnetic Fluctuations in the Quasi-1D Ising-like Antiferromagnet TlCoCl$_3$
Creators: name: Oosawa, A.
name: Kakurai, K.
name: Nishiwaki, Y.
name: Kato, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Polarized neutron inelastic scattering experiments have been carried out in the quasi-1D Ising-like antiferromagnet TlCoCl$_3$. We observed the longitudinal magnetic fluctuation $S_{zz} (Q, ω)$ for the spin-wave excitation continuum, which has not been observed in the unpolarized neutron inelastic scattering experiments of the quasi-1D Ising-like antiferromagnets CsCoCl$_3$ and TlCoCl$_3$ so far, together with the transverse magnetic fluctuation $S_{xx} (Q, ω)$. We compared both obtained intensities of $S_{xx} (Q, ω)$ and $S_{zz} (Q, ω)$ with the perturbation theory from the pure Ising limit by Ishimura and Shiba, and a semi-quantitative agreement was found.
description: 5 pages, 5 figures, jpsj2.cls, to be published in J. Phys. Soc. Jpn. Vol. 75 (2006) No. 7
Redshift-space distortions with split densities
Creators: name: Paillas, Enrique
name: Cai, Yan-Chuan
name: Padilla, Nelson
name: Sánchez, Ariel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Accurate modelling of redshift-space distortions (RSD) is challenging in the non-linear regime for two-point statistics e.g. the two-point correlation function (2PCF). We take a different perspective to split the galaxy density field according to the local density, and cross-correlate those densities with the entire galaxy field. Using mock galaxies, we demonstrate that combining a series of cross-correlation functions (CCFs) offers improvements over the 2PCF as follows: 1. The distribution of peculiar velocities in each split density is nearly Gaussian. This allows the Gaussian streaming model for RSD to perform accurately within the statistical errors of a ($1.5\,h^{-1}$Gpc)$^3$ volume for almost all scales and all split densities. 2. The PDF of the density field at small scales is non-Gaussian, but the CCFs of split densities capture the non-Gaussianity, leading to improved cosmological constraints over the 2PCF. We can obtain unbiased constraints on the growth parameter $fσ_{12}$ at the per-cent level, and Alcock-Paczynski (AP) parameters at the sub-per-cent level with the minimal scale of $15\,h^{-1}{\rm Mpc}$. This is a $\sim$30 per cent and $\sim$6 times improvement over the 2PCF, respectively. The diverse and steep slopes of the CCFs at small scales are likely to be responsible for the improved constraints of AP parameters. 3. Baryon acoustic oscillations (BAO) are contained in all CCFs of split densities. Including BAO scales helps to break the degeneracy between the line-of-sight and transverse AP parameters, allowing independent constraints on them. We discuss and compare models for RSD around spherical densities.
description: 23 pages, 16 figures, MNRAS accepted version after peer review, minor comments
Tachyon condensation in open string field theory and the {u03B2}{u03B3} conformal field theory
Creators: name: Smith, Madeleine Lindsay
Publisher: name: The Australian National University
Year: 2011
Subjects: subject: QC793.5.T32 S65 2011
subject: Tachyons
subject: Field theory (Physics)
subject: Quantum field theory

description: In this thesis an attempt is made to formulate Schnabl's analytic solution of the string field theory equations in terms of the {u03B2}{u03B3} CFT. Such background-dependent solutions may be useful for the construction of tachyon lump solutions. Using the Schnabl solution's explicit description in terms of coordinate-transformed Vira{u00AD}soro and ghost operators to try to do this leads to severe difficulties. Possible explanations for the cause of these problems are discussed, along with some suggestions for how to overcome them. This thesis also contains a review of the construction of Schnabl's solution as well as open string field theory more generally.
ML-MOC: Machine Learning (kNN and GMM) based Membership Determination for Open Clusters
Creators: name: Agarwal, Manan
name: Rao, Khushboo K.
name: Vaidya, Kaushar
name: Bhattacharya, Souradeep
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The existing open cluster membership determination algorithms are either prior dependent on some known parameters of clusters or are not automatable to large samples of clusters. In this paper, we present, ML-MOC, a new machine learning based approach to identify likely members of open clusters using the Gaia DR2 data, and no a priori information about cluster parameters. We use the k-Nearest Neighbours (kNN) algorithm and the Gaussian Mixture Model (GMM) on the high-precision proper motions and parallax measurements from Gaia DR2 data to determine the membership probabilities of individual sources down to G ~20 mag. To validate the developed method, we apply it on fifteen open clusters: M67, NGC 2099, NGC 2141, NGC 2243, NGC 2539, NGC 6253, NGC 6405, NGC 6791, NGC 7044, NGC 7142, NGC 752, Blanco 1, Berkeley 18, IC 4651, and Hyades. These clusters differ in terms of their ages, distances, metallicities, extinctions and cover a wide parameter space in proper motions and parallaxes with respect to the field population. The extracted members produce clean colour-magnitude diagrams and our astrometric parameters of the clusters are in good agreement with the values derived by the previous works. The estimated degree of contamination in the extracted members range between 2% and 12%. The results show that ML-MOC is a reliable approach to segregate the open cluster members from the field stars.
description: 19 pages, 17 figures, Accepted for publication at MNRAS
Pre-classical solutions of the vacuum Bianchi I loop quantum cosmology
Creators: name: Date, Ghanashyam
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Loop quantization of diagonalized Bianchi class A models, leads to a partial difference equation as the Hamiltonian constraint at the quantum level. A criterion for testing a viable semiclassical limit has been formulated in terms of existence of the so-called pre-classical solutions. We demonstrate the existence of pre-classical solutions of the quantum equation for the vacuum Bianchi I model. All these solutions avoid the classical singularity at vanishing volume.
description: 4 pages, revtex4, no figures. In version 2, reference added and minor changes made. The final Version 3 includes additional explanations
Primordial Power Spectrum Reconstruction
Creators: name: Mukherjee, Pia
name: Wang, Yun
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In order to reconstruct the initial conditions of the universe it is important to devise a method that can efficiently constrain the shape of the power spectrum of primordial matter density fluctuations in a model-independent way from data. In an earlier paper we proposed a method based on the wavelet expansion of the primordial power spectrum. The advantage of this method is that the orthogonality and multiresolution properties of wavelet basis functions enable information regarding the shape of $P_{\rm in}(k)$ to be encoded in a small number of non-zero coefficients. Any deviation from scale-invariance can then be easily picked out. Here we apply this method to simulated data to demonstrate that it can accurately reconstruct an input $P_{\rm in}(k)$, and present a prescription for how this method should be used on future data.
description: 4 pages, 2 figures. JCAP accepted version
Symmetries versus the spectrum of $ J\bar T$-deformed CFTs
Creators: name: Guica, Monica
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It has been recently shown that classical $J\bar T$ - deformed CFTs possess an infinite-dimensional Witt-Kač-Moody symmetry, generated by certain field-dependent coordinate and gauge transformations. On a cylinder, however, the equal spacing of the descendants' energies predicted by such a symmetry algebra is inconsistent with the known finite-size spectrum of $J\bar T$ - deformed CFTs. Also, the associated quantum symmetry generators do not have a proper action on the Hilbert space. In this article, we resolve this tension by finding a new set of (classical) conserved charges, whose action is consistent with semi-classical quantization, and which are related to the previous symmetry generators by a type of energy-dependent spectral flow. The previous inconsistency between the algebra and the spectrum is resolved because the energy operator does not belong to the spectrally flowed sector.
description: fixed a minus sign; various minor cosmetic changes; added a brief discussion
Verma modules for Yangians
Creators: name: Billig, Y.
name: Futorny, V.
name: Molev, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 81R10

description: We study the Verma modules M(mu(u)) over the Yangian Y(a) associated with a simple Lie algebra a. We give necessary and sufficient conditions for irreducibility of M(mu(u)). Moreover, regarding the simple quotient L(mu(u)) of M(mu(u)) as an a-module, we give necessary and sufficient conditions for finite-dimensionality of the weight subspaces of L(mu(u)).
description: 18 pages
Deep learning in nano-photonics: inverse design and beyond
Creators: name: Wiecha, Peter R.
name: Arbouet, Arnaud
name: Girard, Christian
name: Muskens, Otto L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Deep learning in the context of nano-photonics is mostly discussed in terms of its potential for inverse design of photonic devices or nanostructures. Many of the recent works on machine-learning inverse design are highly specific, and the drawbacks of the respective approaches are often not immediately clear. In this review we want therefore to provide a critical review on the capabilities of deep learning for inverse design and the progress which has been made so far. We classify the different deep learning-based inverse design approaches at a higher level as well as by the context of their respective applications and critically discuss their strengths and weaknesses. While a significant part of the community's attention lies on nano-photonic inverse design, deep learning has evolved as a tool for a large variety of applications. The second part of the review will focus therefore on machine learning research in nano-photonics "beyond inverse design". This spans from physics informed neural networks for tremendous acceleration of photonics simulations, over sparse data reconstruction, imaging and "knowledge discovery" to experimental applications.
description: Review article of 18 pages, 7 figures, 4 info-boxes
Full compressible 3D magnetohydrodynamic simulation of solar wind
Creators: name: Matsumoto, Takuma
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Identifying the heating mechanisms of the solar corona and the driving mechanisms of solar wind are key challenges in understanding solar physics. A full three-dimensional compressible magnetohydrodynamic (MHD) simulation was conducted to distinguish between the heating mechanisms in the fast solar wind above the open field region. Our simulation describes the evolution of the Alfvénic waves, which includes the compressible effects from the photosphere to the heliospheric distance $s$ of 27 solar radii ($R_\odot$). The hot corona and fast solar wind were reproduced simultaneously due to the dissipation of the Alfvén waves. The inclusion of the transition region and lower atmosphere enabled us to derive the solar mass loss rate for the first time by performing a full three-dimensional compressible MHD simulation. The Alfvén turbulence was determined to be the dominant heating mechanism in the solar wind acceleration region ($s>1.3 R_\odot$), as suggested by previous solar wind models. In addition, shock formation and phase mixing are important below the lower transition region ($s<1.03R_\odot$) as well.
description: 9 pages, 7 figures, accepted for publication in MNRAS
Energy of a Charged Wormhole
Creators: name: Salti, Mustafa
name: Aydogdu, Oktay
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper has been removed by arXiv administrators because it overlaps gr-qc/0102077 and others. This paper also has excessive overlap with the following papers also written by the authors or their collaborators: gr-qc/0603027, gr-qc/0606022, gr-qc/0512080, gr-qc/0603108, gr-qc/0601141, gr-qc/0603063, gr-qc/0608050, gr-qc/0607095, gr-qc/0607011, gr-qc/0607083, and others.
description: This submission has been withdrawn by arXiv administrators due to inappropriate text reuse from external sources
Self-Organized Networks and Lattice Effects in High Temperature Superconductors
Creators: name: Phillips, J. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The entirely orbital self-organized dopant percolative filamentary model describes many counter-intuitive chemical trends in oxide superconductors quantitatively, especially the high superconductive transition temperatures Tc. According to rules previously used successfully for network glasees, the host networks are marginally stable mechanically, and the high Tc's are caused by network softening, which produces large electron-phonon interactions at interlayer dopants for states near the Fermi energy.
description: 12 pages (with one figure)
The Early Spectra of Eta Carinae 1892 to 1941 and the Onset of Its High Excitation Emission Spectrum
Creators: name: Humphreys, Roberta M.
name: Davidson, Kris
name: Koppleman, Michael
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The observed behavior of eta Car from 1860 to 1940 has not been considered in most recent accounts, nor has it been explained in any quantitative model. We have used modern digital processing techniques to examine Harvard objective-prism spectra made from 1892 to 1941. Relatively high-excitation He I 4471 and [Fe III] 4658 emission, conspicuous today, were weak and perhaps absent throughout those years. Feast et al. noted this qualitative fact for other pre-1920 spectra, but we quantify it and extend it to a time only three years before Gaviola's first observations of the high-excitation features. Evidently the supply of helium-ionizing photons(lambda < 504A) grew rapidly between 1941 and 1944. The apparent scarcity of such far-UV radiation before 1944 is difficult to explain in models that employ a hot massive secondary star,} because no feasible dense wind or obscuration by dust would have hidden the photoionization caused by the proposed companion during most of its orbital period. We also discuss the qualitative near-constancy of the spectrum from 1900 to 1940, and eta Car's photometric and spectroscopic transition between 1940 and 1953.
description: 41 pages, 12 figures
Gravitational dynamics: A novel shift in the Hamiltonian paradigm
Creators: name: Ashtekar, Abhay
name: Varadarajan, Madhavan
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: It is well known that Einstein's equations assume a simple polynomial form in the Hamiltonian framework based on a Yang-Mills phase space. We re-examine the gravitational dynamics in this framework and show that {\em time} evolution of the gravitational field can be re-expressed as (a gauge covariant generalization of) the Lie derivative along a novel shift vector field in {\em spatial} directions. Thus, the canonical transformation generated by the Hamiltonian constraint acquires a geometrical interpretation on the Yang-Mills phase space, similar to that generated by the diffeomorphism constraint. In classical general relativity this geometrical interpretation significantly simplifies calculations and also illuminates the relation between dynamics in the `integrable' (anti)self-dual sector and in the full theory. For quantum gravity, it provides a point of departure to complete the Dirac quantization program for general relativity in a more satisfactory fashion. This gauge theory perspective may also be helpful in extending the `double copy' ideas relating the Einstein and Yang-Mills dynamics to a non-perturbative regime. Finally, the notion of generalized, gauge covariant Lie derivative may also be of interest to the mathematical physics community as it hints at some potentially rich structures that have not been explored.
description: Invited article to the 5 year Commemorative issue. 39 pages; Attempt made to make the presentation reasonably self-contained so as to be accessible to the general relativity, "double copy" and mathematical physics communities. In the revised version minor typos were corrected and two references were added
Journaling as an instructional tool for nursing students
Creators: name: Brevik, Yvonne
Publisher: name: University of British Columbia
Year: 2009

description: Journaling has become more common in academic work in recent years and nursing has moved toward using this technique with nursing students. Journals have been shown to benefit both students and instructors by promoting reflection, thinking and learning. Instructors use journaling in various ways, with different philosophical foundations, with little understanding about how journaling is done, and with few strategies to optimize the process. The purpose of this study is to better understand how instructors use journals with students, and in conjunction with the existing literature, to develop guidelines for practice for nursing instructors. The research question for this study was: "How and why do nursing instructor's use journaling as an instructional tool?" This qualitative study used a semi-structured interview process to gather data from five nursing instructors at a university with Baccalaureate, Master's, and Doctoral Degree-granting status in nursing. All had used or were currently using journaling with nursing students learning in a variety of clinical and classroom settings. The data collected was categorized into the predominant emergent themes and was discussed in conjunction with the literature. As a result of the findings, practice guidelines were developed to offer suggestions and alternatives to using journals as instructional tools with students.
Feedback - Keeping it Simple
Creators: name: Higgins, Mark
Publisher: name: National Teaching Repository
Year: 2024
Subjects: classificationCode: 390303
subject: Higher education

description: Feedback: Keeping it simpleMarking is a pressurised process where time is short, and student survey data often indicates student dissatisfaction with feedback received. This simple model (offered in two formats) provides a simple tool to enhance feedback practices. It is not offered as a panacea, but serves as a guide I hope you will find useful. If you have any thoughts or questions please do get in touch, My email can be found within the materials . DOI:10.25416/NTR.24961011
Variational design principles for nonequilibrium colloidal assembly
Creators: name: Das, Avishek
name: Limmer, David T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Using large deviation theory and principles of stochastic optimal control, we show that rare molecular dynamics trajectories conditioned on assembling a specific target structure encode a set of interactions and external forces that lead to enhanced stability of that structure. Such a relationship can be formulated into a variational principle, for which we have developed an associated optimization algorithm and have used it to determine optimal forces for targeted self-assembly within nonequilibrium steady-states. We illustrate this perspective on inverse design in a model of colloidal cluster assembly within linear shear flow. We find that colloidal clusters can be assembled with high yield using specific short-range interactions of tunable complexity. Shear decreases the yields of rigid clusters, while small values of shear increase the yields of nonrigid clusters. The enhancement or suppression of the yield due to shear is rationalized with a generalized linear response theory. By studying 21 unique clusters made of 6, 7 or 8 particles, we uncover basic design principles for targeted assembly out of equilibrium.
description: 13 pages, 8 figures
Quantum protocols with transverse spatial modes
Creators: name: Morizur, Jean-Francois
Publisher: name: The Australian National University
Year: 2011
Subjects: subject: QC446.2.M67 2011
subject: Quantum optics
subject: Quantum computers

description: We present in this thesis a study of the spatial properties of light at the quantum level. More specifically, we focus on techniques to manipulate the quantum fluctuations of different degrees of freedom in a beam's transverse plane, and on the quantum protocols we can implement using these specific fluctuations. We begin by providing an experimental characterization of different methods to manipulate the quantum fluctuations of multiple transverse profiles, or modes, in one beam. While manipulating the quantum fluctuations of a mode, a process known as squeezing, for a single mode beam can be performed very efficiently using a conventional optical parametric oscillator, we present implementations of different, less conventional techniques able to generate a beam carrying multiple squeezed modes. Conventionally, the squeezed modes we can generate using these techniques are fixed by the optical design. We present a new optical system, called a Unitary Programmable Mode Converter (UPMC), able to reshape these modes at will. We show theoretically that such a UPMC can in principle perform any desired reshaping of the modes. We present the performances of an experimental implementation of the UPMC, both in a classical and quantum context. We find that the UPMC performs as predicted, and we present a method to optimize the UPMC settings taking into account experimental restrictions. The UPMC, combined with a technique to build a beam carrying multiple squeezed modes, allows us to generate a beam with squeezing in any desired set of spatial modes. In order to detect these fluctuations, we built a multipixel homodyne detection, a detection system able to record simultaneously the quantum fluctuations in all these modes. We provide in this thesis our solutions to overcome the electronic challenges associated with such a device, and present an experimental characterization of the performances of our multipixel homodyne detection. Finally, we combine these experimental characterizations to discuss how these techniques help us implement different quantum protocols involving multiple spatial modes, more specifically quantum enhanced detections and cluster states quantum computation.