cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spherical Tuples of Hilbert Space Operators
Creators: name: Chavan, S.
name: Yakubovich, D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 47A13, 47B32, 46E20

description: We introduce and study a class of operator tuples in complex Hilbert spaces, which we call spherical tuples. In particular, we characterize spherical multi-shifts, and more generally, multiplication tuples on RKHS. We further use these characterizations to describe various spectral parts including the Taylor spectrum. We also find a criterion for the Schatten $S_p$-class membership of cross-commutators of spherical $m$-shifts. We show, in particular, that cross-commutators of non-compact spherical $m$-shifts cannot belong to $S_p$ for $p \le m$. We specialize our results to some well-studied classes of multi-shifts. We prove that the cross-commutators of a spherical joint $m$-shift, which is a $q$-isometry or a $2$-expansion, belongs to $S_p$ if and only if $p > m$. We further give an example of a spherical jointly hyponormal $2$-shift, for which the cross-commutators are compact but not in $S_p$ for any $p
description: a version close to final one
Bounds on pressure profile and internal compactness of static perfect fluid spheres with a positive cosmological constant
Creators: name: Shojai, F.
name: Shojai, A.
name: Mousavi, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Some theorems for a static prefect fluid sphere, i.e. a star, in the presence of a positive cosmological constant are proved. These theorems put bounds on the pressure profile and internal compactness of the star.
description: 2 figures
Dynamics of rotationally fissioned asteroids: Source of observed small asteroid systems
Creators: name: Jacobson, Seth A
name: Scheeres, Daniel J
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present a model of near-Earth asteroid (NEA) rotational fission and ensuing dynamics that describes the creation of synchronous binaries and all other observed NEA systems including: doubly synchronous binaries, high- e binaries, ternary systems, and contact binaries. Our model only presupposes the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, "rubble pile" asteroid geophysics, and gravitational interactions. The YORP effect torques a "rubble pile" asteroid until the asteroid reaches its fission spin limit and the components enter orbit about each other (Scheeres, D.J. [2007]. Icarus 189, 370-385). Non-spherical gravitational potentials couple the spin states to the orbit state and chaotically drive the system towards the observed asteroid classes along two evolutionary tracks primarily distinguished by mass ratio. Related to this is a new binary process termed secondary fission - the secondary asteroid of the binary system is rotationally accelerated via gravitational torques until it fissions, thus creating a chaotic ternary system. The initially chaotic binary can be stabilized to create a synchronous binary by components of the fissioned secondary asteroid impacting the primary asteroid, solar gravitational perturbations, and mutual body tides. These results emphasize the importance of the initial component size distribution and configuration within the parent asteroid. NEAs may go through multiple binary cycles and many YORP-induced rotational fissions during their approximately 10 Myr lifetime in the inner Solar System. Rotational fission and the ensuing dynamics are responsible for all NEA systems including the most commonly observed synchronous binaries.
description: 39 pages, 19 figures
Shift Radix Systems - A Survey
Creators: name: Kirschenhofer, Peter
name: Thuswaldner, Jörg M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11A63

description: Let $d\ge 1$ be an integer and ${\bf r}=(r_0,\dots,r_{d-1}) \in \mathbf{R}^d$. The {\em shift radix system} $τ_\mathbf{r}: \mathbb{Z}^d \to \mathbb{Z}^d$ is defined by $$ τ_{\bf r}({\bf z})=(z_1,\dots,z_{d-1},-\lfloor {\bf r} {\bf z}\rfloor)^t \qquad ({\bf z}=(z_0,\dots,z_{d-1})^t). $$ $τ_\mathbf{r}$ has the {\em finiteness property} if each ${\bf z} \in \mathbb{Z}^d$ is eventually mapped to ${\bf 0}$ under iterations of $τ_\mathbf{r}$. In the present survey we summarize results on these nearly linear mappings. We discuss how these mappings are related to well-known numeration systems, to rotations with round-offs, and to a conjecture on periodic expansions w.r.t.\ Salem numbers. Moreover, we review the behavior of the orbits of points under iterations of $τ_\mathbf{r}$ with special emphasis on ultimately periodic orbits and on the finiteness property. We also describe a geometric theory related to shift radix systems.
description: 45 pages, 16 figures
Reactor antineutrino experiments
Creators: name: Lu, Haoqi
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Neutrinos are elementary particles in the standard model of particle physics. There are 3 flavors of neutrinos that oscillate among themselves. Their oscillation can be described by a 3$\times$3 unitary matrix, containing three mixing angles $θ_{12}$, $θ_{23}$, $θ_{13}$, and one CP phase. Both $θ_{12}$ and $θ_{23}$ are known from previous experiments. $θ_{13}$ was unknown just two years ago. The Daya Bay experiment gave the first definitive non-zero value in 2012. An improved measurement of the oscillation amplitude $\sin^{2}2(θ_{13})$ = $0.090^{+0.008}_{-0.009}$ and the first direct measurement of the $\barν_{e}$ mass-squared difference $\mid$$Δm^2_{ee}$$\mid$ = $(2.59^{+0.19}_{-0.20})\times10^{-3} \rm eV^{2}$ were obtained recently. The large value of $θ_{13}$ boosts the next generation of reactor antineutrino experiments designed to determine the neutrino mass hierarchy, such as JUNO and RENO-50 .
Global stability analysis of the axisymmetric wake past a spinning bullet-shaped body
Creators: name: Jiménez-González, J. I.
name: Sevilla, A.
name: Sanmiguel-Rojas, E.
name: Martínez-Bazán, C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We analyze the global linear stability of the axisymmetric flow around a spinning bullet-shaped body as a function of the Reynolds number, $Re=w_{\infty}D/ν$, and of the rotation parameter $Ω=ωD/(2 w_{\infty})$, in the ranges $Re<450$ and $0\leqΩ\leq 1$. Here, $w_{\infty}$ and $ω$ are the free-stream and the body rotation velocities respectively, and $ν$ is the fluid kinematic viscosity. The spectrum and the eigenfunctions obtained allow us to explain the different bifurcations from the axisymmetric state observed in previous numerical studies. Our results reveal that three global eigenmodes, denoted Low-Frequency (LF), Medium-Frequency (MF) and High-Frequency (HF) modes, become unstable in different regions of the $Re-Ω$ parameter plane. We provide precise computations of the corresponding neutral curves, that divide the $Re-Ω$ plane into four different regions: the stable axisymmetric flow prevails for small enough values of $Re$ and $Ω$, while three different frozen states, where the wake structures co-rotate with the body at different angular velocities, take place as a consequence of the destabilization of the LF, MF and HF modes. Several direct numerical simulations of the nonlinear state associated to the MF mode, identified here for the first time, are also reported to complement the linear stability results. Finally, we point out the important fact that, since the axisymmetric base flow is $SO(2)$-symmetric, the theory of equivariant bifurcations implies that the weakly non-linear regimes that emerge close to criticality must necessarily take the form of rotating-wave states. These states, previously referred to as frozen wakes in the literature, are thus shown to result from the base-flow symmetry.
description: 25 pages, 16 figures, 5 tables. Accepted for publication in J. Fluid Mech
Prospects of 3D mapping of the Galactic Centre clouds with X-ray polarimetry
Creators: name: Marin, F.
name: Karas, V.
name: Kunneriath, D.
name: Muleri, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: J.2.3; J.2.9
subject: 85-05

description: Despite past panchromatic observations of the innermost part of the Milky Way, the overall structure of the Galactic Centre (GC) remains enigmatic in terms of geometry. In this paper, we aim to show how polarimetry can probe the three-dimensional position of the molecular material in the central ~100 pc of the GC. We investigate a model where the central supermassive black hole Sgr A* is radiatively coupled to a fragmented circumnuclear disc (CND), an elliptical twisted ring representative of the central molecular zone (CMZ), and the two main, bright molecular clouds Sgr B2 and Sgr C. 8 -- 35 keV integrated polarization mapping reveals that Sgr B2 and Sgr C, situated at the two sides of the CMZ, present the highest polarization degrees (66.5 and 47.8 per cent respectively), both associated with a polarization position angle psi = 90deg (normal to the scattering plane). The CND shows a lower polarization degree, 1.0 per cent with psi = -20.5deg, tracing the inclination of the CND with respect to the Galactic plane. The CMZ polarization is spatially variable. We also consider a range of spatial locations for Sgr A* and the reprocessing media, and investigate how the modeled three-dimensional geometry influences the resulting GC polarization. The two reflection nebulae are found to always produce high polarization degrees (>> 10 per cent). We show that a 500 ks observation with a broadband polarimeter could constrain the location and the morphology of the scattering material with respect to the emitting source, revealing the past activity of Sgr A*.
description: 8 pages, 4 Figures, 4 Tables, accepted for publication in MNRAS
Plasma burn-through simulations using the DYON code and predictions for ITER
Creators: name: Kim, Hyun-Tae
name: Sips, A. C. C.
name: de Vries, P. C.
name: Contributors, JET-EFDA
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: This paper will discuss simulations of the full ionization process (i.e. plasma burn-through), fundamental to creating high temperature plasma. By means of an applied electric field, the gas is partially ionized by the electron avalanche process. In order for the electron temperature to increase, the remaining neutrals need to be fully ionized in the plasma burn-through phase, as radiation is the main contribution to the electron power loss. The radiated power loss can be significantly affected by impurities resulting from interaction with the plasma facing components. The DYON code is a plasma burn-through simulator developed at Joint European Torus (JET) [1] [2]. The dynamic evolution of the plasma temperature and plasma densities including impurity content is calculated in a self-consistent way, using plasma wall interaction models. The recent installation of a beryllium wall at JET enabled validation of the plasma burn-through model in the presence of new, metallic plasma facing components. The simulation results of the plasma burn-through phase show consistent good agreement against experiments at JET, and explain differences observed during plasma initiation with the old carbon plasma facing components. In the International Thermonuclear Experimental Reactor (ITER), the allowable toroidal electric field is restricted to 0.35 [V/m], which is significantly lower compared to the typical value (~ 1 [V/m]) used in the present devices. The limitation on toroidal electric field also reduces the range of other operation parameters during plasma formation in ITER. Thus, predictive simulations of plasma burn-through in ITER using validated model is of crucial importance. This paper provides an overview of the DYON code and the validation, together with new predictive simulations for ITER using the DYON code.
description: 11 pages, 12 figures. This is an author-created, un-copyedited version of an article accepted for publication in Plasma Physics and Controlled Fusion. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it
Blue Straggler masses from pulsation properties. I. The case of NGC6541
Creators: name: Fiorentino, G.
name: Lanzoni, B.
name: Dalessandro, E.
name: Ferraro, F. R.
name: Bono, G.
name: Marconi, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We used high-spatial resolution images acquired with the WFC3 on board HST to probe the population of variable blue straggler stars in the central region of the poorly studied Galactic globular cluster NGC 6541. The time sampling of the acquired multi wavelength (F390W, F555W and F814W) data allowed us to discover three WUma stars and nine SX Phoenicis. Periods, mean magnitudes and pulsation modes have been derived for the nine SX Phoenicis and their masses have been estimated by using pulsation equations obtained from linear non adiabatic models. We found masses in the range 1.0-1.1Mo, with an average value of 1.06+-0.09 Mo (sigma = 0.04), significantly in excess of the cluster Main Sequence Turn Off mass (~ 0.75Mo). A mild trend between mass and luminosity seems also to be present. The computed pulsation masses turn out to be in very good agreement with the predictions of evolutionary tracks for single stars, indicating values in the range ~ 1.0-1.2 Mo for most of the BSS population, in agreement with what discussed in a number of previous studies.
description: 8 pages, 9 figures, ApJ, accepted
Toward a non-organizational theory of human resource management? A complex adaptive systems perspective on the human resource management ecosystem in (con) temporary organizing
Creators: name: Burke, Caitriona M
name: MORLEY, MICHAEL
Publisher: name: University of Limerick
Year: 2022
Subjects: Commerce, management, tourism and services

description: The emergence of the temporary organization has ushered in a new logic of organizing accompanied by paradigm-shifting challenges with respect to how the evolving nature of work, workers, and collective effort are to be understood. To capture the complexity inherent in this new order, and to broaden our focus from the organization to the enfolding ecosystem within which temporary organizing must be situated and under?stood, we engage in problematization to develop a multi-level framework for theorizing the contemporary human resource management ecosystem. Curating insights from complexity science, we conceptualize this ecosystem as a complex adaptive one and we propose a framework that integrates key structural (open boundaries and relational constitution), emergent (contextual and complex causality), and temporal (dynamic and adaptive) properties. To deepen lines of inquiry around these defining elements, we advance a series of propositions for testing, and we outline a range of theoretical, methodological, and practical implications that arise from our work.
Lorentz-violating Euler-Heisenberg effective action
Creators: name: Furtado, J.
name: Mariz, T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we study the radiative generation of the Lorentz-violating Euler-Heisenberg action, in the weak field approximation. For this, we first consider a nonperturbative calculation in the coefficient $c_{μν}$, however, by assuming rotational invariance. Within this approach, we also obtain the results of the amplitude for the photon triple splitting. In the following, we take into account the perturbative approach, where $c_{μν}$ is treated as a insertion in the propagator and a new vertex. The partial results are in fact an expansion up to first order in $c_{μν}$ of the nonperturbative ones, with $c_{00}=κ$ and $c_{0i}=c_{ij}=0$. This suggest that the complete results obtained in the nonperturbative approach can be used in both treatments.
description: 15 pages, 5 figures, accepted for publication in Phys. Rev. D
Structures of Class 1 CRISPR-Cas surveillance complexes
Creators: name: Schwartz, Evan Andrew
name: 0000-0002-7468-9010
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: CRISPR
CRISPR-Cas
Cryo-EM
Structural biology
Biochemistry
Electron microscopy

description: One of the lines of defense for bacteria against bacteriophages is CRISPR-Cas, an adaptive immune system that serves as a bacterial genetic memory of previous phage infection. CRISPR-Cas immune defense involves the use of Cas proteins assembled along a CRISPR RNA guide to target and destroy invading nucleic acids. Class 2 single peptide CRISPR-Cas effectors, such as Cas9, have been highly studied for their repurposing as a genome editing tool. However, the Class 1 multi-subunit CRISPR systems are relatively understudied compared to their Class 2 counterparts. Class 1 CRISPR systems can be further classified into type I, type III, and type IV systems. Despite receiving less focus, type I and type III systems together make up about 90% of all CRISPR systems in nature. Type Is are characterized by their ability to degrade double-stranded DNA using Cas3, a trans-acting helicase-nuclease, while type IIIs have been shown to cut single-stranded RNA with Cas7. Here, my collaborators and I investigate the chimeric type I-D complex and describe its identity as a hybrid between type I and type III systems, as well as the type III-D complex, noted by its use of subunit fusions, to help unfold evolution of Class 1 CRISPR-Cas systems.
Towards a Language of Yearning: Virginia Woolf’s Modernist Sublime
Creators: name: Davis, Delia Maria
Publisher: name: The University of Texas at Austin
Year: 2018
Subjects: Virginia Woolf
Woolf
The Voyage Out
Orlando
Orlando: A Biography
Three Guineas
Rachel Vinrace
modernist
modernism
sublime
Romantic
Jane Austen
Joseph Conrad
materialist
feminist
existential
existentialist
modernist sublime
formal experimentation
genre
yearning
identity-based yearning
universal existential yearning
longing
potentiality
symbology of landscapes
semiotics of sensuality
Outsiders Society
radical politics
patriarchy
imperialism
gender

description: This thesis examines the intersection between Virginia Woolf’s contemporary materialist critique of imperial-patriarchal society and the more timeless existential inquiries that permeate her work. Analyzing two novels, The Voyage Out (1920) and Orlando: A Biography (1928), the project looks at the ways in which Woolf’s experimentations with genre develop her materialist critique while her modernist sublime aesthetic connects the political to existential questions. The thesis also argues for a thematic potentiality of Being that shapes Woolf’s unified political-artistic vision. It identifies two different types of yearning that characterize the stories of Woolf’s female protagonists: “identity-based yearning” and “universal existential yearning.” The former is a sort of longing to push beyond and rupture the constraints of hierarchical society, while the latter emphasizes expansion, growth and possibility. This thesis argues that Woolf’s modernist sublime aesthetic articulates the relationship between these two types of yearning. Her sublime can be found in a “symbology of landscapes” and a “semiotics of sensuality,” and these in some ways are borrowed from the Romantic aesthetic of the sublime, which is predicated on nature and the feelings of “astonishment” and existential terror that nature can give rise to. The longing and potentiality that the project traces in Woolf’s fiction also appears in her most radical pacifist-feminist essay, Three Guineas (1938). This project argues that Woolf’s essay makes use of the same formal experimentations in its materialist critique, which articulates how patriarchy works on an institutional level to perpetuate oppression. At the end of Three Guineas, Woolf proposes that women and other marginalized groups band together to form an Outsiders’ Society that will work in their own ways to achieve peace and social unity. The idea of Woolf’s Outsiders’ Society not only carries the same spirit of potentiality that unifies her political-artistic vision, but also offers a glimpse of a new horizon, a different possibility that could form the vocabulary for a new kind of progressivism.
A contemporary feminist critique of psychoanalysis through Gilles Deleuze and Felix Guatarri
Creators: name: Blake, Kathryn M.
Publisher: name: No Publisher Supplied
Year: 2009

description: It can be seen through the writings of such feminist writers as Juliet Mitchell, Jacqueline Rose and Luce Irigaray; Sigmund Freud's work on psychoanalysis has offered feminists challenges, revolutionized theories, and patriarchal targets. Specifically, the Oedipus complex locates the very psychical reproduction of patriarchy and explains the structure of sexual roles in Western society. Although Freud had no feminist intent in his writings, feminists have managed to find his work useful. The dilemma facing contemporary feminism, which is identified as post-1995 feminism committed to corporeality and sexual difference, is that psychoanalysis proposes explanations for, but fails to offer solutions for how to break away, from the reproduction of patriarchy and its rigid sexual roles. The goal of contemporary feminism is to break away from the circularity of the Oedipus complex and into new ways of thinking. Anti-Oedipus and A Thousand Plateaus by Gilles Deleuze and Felix Guattari offer different modes of thinking and poignant critiques of psychoanalysis. The feminist uses and interpretations of Deleuze and Guattari by such writers as Elizabeth Grosz, Claire Colebrook and Rosi Braidotti constitute the most useful move beyond the circularity of the Oedipus complex. This thesis examines Freud's writings, particularly those centered on the Oedipus complex, using an infusion of an earlier generation of feminist critiques, particularly that of Luce Irigaray. The research focuses on how to live with certain aspects of psychoanalysis such as the Oedipus complex that are harmful for women, and it develops new theories that break away from the oedipal triangle. Such critiques and different modalities of thinking can be found in the writings of Deleuze and Guattari. The writings of these feminist authors, and the incorporation Luce Irigaray's work on sexual difference, have helped to dismantle the circularity and dominance of the Oedipus complex by introducing a struggle for new ideas related to thinking of difference and becoming as ways of thinking and living.
Ricci curvature on polyhedral surfaces via optimal transportation
Creators: name: Loisel, Benoît
name: Romon, Pascal
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: The problem of defining correctly geometric objects such as the curvature is a hard one in discrete geometry. In 2009, Ollivier defined a notion of curvature applicable to a wide category of measured metric spaces, in particular to graphs. He named it coarse Ricci curvature because it coincides, up to some given factor, with the classical Ricci curvature, when the space is a smooth manifold. Lin, Lu & Yau, Jost & Liu have used and extended this notion for graphs giving estimates for the curvature and hence the diameter, in terms of the combinatorics. In this paper, we describe a method for computing the coarse Ricci curvature and give sharper results, in the specific but crucial case of polyhedral surfaces.
The masses of faint White Dwarfs measured thanks to their orbital acceleration
Creators: name: Escorza, Ana
name: De Rosa, Robert J.
Publisher: name: Zenodo
Year: 2022

description: Barium stars are main-sequence or red-giant stars that accreted heavy-metal-rich material from a former Asymptotic Giant Branch (AGB) companion in a binary system. The orbital properties of Barium stars are important to constrain interaction mechanisms in binary systems with giant stars, and their chemical abundances are tracers of AGB nucleosynthesis processes. These former AGB companions are now dim and, in most cases, not directly detectable white dwarfs. Their masses, however, contain important information about the formation of Barium stars and are a necessary input parameter if we want to use binary evolution or AGB nucleosynthesis models to better understand the history of these systems. The observational constraints concerning the orbital and stellar properties of Barium stars have increased in the past years thanks to long-period binary monitoring programs and to the accurate distances provided by the Gaia mission. However, important uncertainties remained concerning their faint white dwarf companions. In this contribution, I will show that, even though Gaia alone is not good enough to characterize these long-period binaries yet, the proper-motion acceleration measured between Hipparcos and Gaia is a very powerful constraint. By combining radial-velocity data with Hipparcos and Gaia astrometry, we measured the orbital inclinations of about 60 Barium star systems and obtained the absolute masses of their, otherwise hidden, white dwarf companions. Via initial-final mass relationships, we can then get direct information about the AGB stars that polluted Barium stars and learn about AGB nucleosynthesis processes and about the mass-transfer mechanisms at place in evolved binary systems.
description: A paper with these results should get to the ArXiV before the end of the year, and future publications applying the same methodology to more complex targets will be submitted soon. Stay tuned!
On the Intersection Property of Conditional Independence and its Application to Causal Discovery
Creators: name: Peters, Jonas
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This work investigates the intersection property of conditional independence. It states that for random variables $A,B,C$ and $X$ we have that $X$ independent of $A$ given $B,C$ and $X$ independent of $B$ given $A,C$ implies $X$ independent of $(A,B)$ given $C$. Under the assumption that the joint distribution has a continuous density, we provide necessary and sufficient conditions under which the intersection property holds. The result has direct applications to causal inference: it leads to strictly weaker conditions under which the graphical structure becomes identifiable from the joint distribution of an additive noise model.
Long-time correlated quantum dynamics of phonon cooling
Creators: name: Carlig, Sergiu
name: Macovei, Mihai A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the steady-state cooling dynamics of vibrational degrees of freedom related to a nanomechanical oscillator coupled with a laser-pumped quantum dot in an optical resonator. Correlations between phonon-cooling and quantum-dot photon emission processes occur respectively when a photon laser absorption together with a vibrational phonon absorption is followed by photon emission in the optical resonator. Therefore, the detection of photons generated in the cavity mode concomitantly contribute to phonon cooling detection of the nanomechanical resonator.
description: 4 pages, 3 figures
Conventional quantum phase transition driven by complex parameter in non-Hermitian PT-symmetric Ising model
Creators: name: Li, C.
name: Zhang, G.
name: Zhang, X. Z.
name: Song, Z.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A conventional quantum phase transition (QPT) can be accessed by varying a real parameter at absolute zero temperature. Motivated by the discovery of the pseudo-Hermiticity of non-Hermitian systems, we explore the QPT in non-Hermitian PT-symmetric Ising model, which is driven by a staggered complex transverse field. Exact solution shows that the Laplacian of the groundstate energy density, with respect to real and imaginary components of the transverse field, diverges on the boundary in the complex plane. The phase diagram indicate that the imaginary transverse field has the effect of shrinking the paramagnet phase. In addition, we also investigate the connection between the geometric phase and the QPT.
description: 7 pages,4 figures
Feminist epistemology and Foucault
Creators: name: Loncarevic, Katarina
Publisher: name: No Publisher Supplied
Year: 2009

description: This thesis takes as a challenge to think about epistemology in a way that goes beyond epistemology understood as a philosophical discipline. I argue that it is important to deal with epistemological problems, because even in our everyday lives we are constantly in different epistemic situations that require explanations. Therefore, it is necessary to know what we claim when we claim to know something, that something we know is true, and how we explain or justify our knowledge or truth claims.Traditionally speaking, all these problems have been considered within epistemology as a philosophical discipline, which is understood as abstract, disinterested and objective search for knowledge and truth, and its core concepts such as knowledge are defined as apolitical and devoid of any kind of social influence. In this thesis I argue for redefinition of the term ‘epistemology’ in order to keep the term while going beyond its understanding as a private conversation among philosophers themselves. Epistemology is understood now as an interdisciplinary field of research, which takes knowledge as a political event, and where knowledge and power are connected in various complex ways. Both French philosopher Michel Foucault and feminist epistemologists share this understanding of knowledge and in subsequent chapters I explore, first, their accounts of epistemological problems, such as knowledge, the subject of knowledge and the ways how knowledge can be a form of resistance to dominant knowledge, and second, the points of the convergence and differences between Foucault’s epistemology developed within his middle works – so-called ‘genealogical’, and feminist epistemological accounts, primarily developed by feminist standpoint theorist Nancy Hartsock and her feminist postmodern critics.The main goals of this thesis are to provide a dialogue between Foucault and feminist epistemology in order to see how and to what extent Foucault’s ideas of power, knowledge and resistance can be useful for feminist epistemological needs, and what feminist epistemological inquiry can be in the future.
The Basic Economic Problems Affecting New England Agriculture
Creators: name: Thomson, E. H.
Publisher: name: Unknown
Year: 1923
Subjects: Agricultural Finance
Crop Production/Industries
Farm Management
Land Economics/Use
Livestock Production/Industries

description: (A discussion by E. H. Thomson, President, Federal Land Bank of Springfield, Mass., at the joint meeting of New England Association of Marketing Officials and New England Research Council, at Boston, Mass., February 1 and 2, 1923.)
Learning local directed acyclic graphs based on multivariate time series data
Creators: name: Deng, Wanlu
name: Geng, Zhi
name: Li, Hongzhe
Publisher: name: arXiv
Year: 2013
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Multivariate time series (MTS) data such as time course gene expression data in genomics are often collected to study the dynamic nature of the systems. These data provide important information about the causal dependency among a set of random variables. In this paper, we introduce a computationally efficient algorithm to learn directed acyclic graphs (DAGs) based on MTS data, focusing on learning the local structure of a given target variable. Our algorithm is based on learning all parents (P), all children (C) and some descendants (D) (PCD) iteratively, utilizing the time order of the variables to orient the edges. This time series PCD-PCD algorithm (tsPCD-PCD) extends the previous PCD-PCD algorithm to dependent observations and utilizes composite likelihood ratio tests (CLRTs) for testing the conditional independence. We present the asymptotic distribution of the CLRT statistic and show that the tsPCD-PCD is guaranteed to recover the true DAG structure when the faithfulness condition holds and the tests correctly reject the null hypotheses. Simulation studies show that the CLRTs are valid and perform well even when the sample sizes are small. In addition, the tsPCD-PCD algorithm outperforms the PCD-PCD algorithm in recovering the local graph structures. We illustrate the algorithm by analyzing a time course gene expression data related to mouse T-cell activation.
description: Published in at http://dx.doi.org/10.1214/13-AOAS635 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Water footprint of Sugarcane Industry The case of Fincha & Metehara Sugarcane Estate FARM
Creators: name: Ahmed, Imran
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Bioethanol, crop water requirement, industry, irrigation, sugarcane &water footprint

description: Water is a scarce resource but it requires for growth of crops. Sugarcane is used for sugar for human consumption and also important for bio-ethanol production. Water footprint (WF) is an indicator that expresses the amount of freshwater embodied in each ton of crop produce. The main problem facing Ethiopia will be water scarcity if water resource is not managed properly. In line with this, study is focused on the importance of water management for sustainable bioenergy production and the competition for water resource between water for food and water for energy. Therefore, this study aims to assess the green, blue and grey water footprint of sugarcane and bioethanol production in the Fincha and Metehara estate farms. Basically, the value of WF may vary based on type of crop, climate, soil characteristics, and production volumes or consumption methods. All those data are available for this investigation was collected from secondary data. These are climatic data (monthly average minimal and maximum temperature, humidity, wind speed and sunshine length), meteorological data (monthly average rainfall data), CROPWAT 8.0 model, nitrogen fertilizer application rates and sugarcane yield. Differences in WF sugarcane are mainly caused by crop water requirements and yields. Applying Penman-Monteith method for water investigation, the sugarcane water requirements (SWR) of 2021.1mm/growing period in Fincha and 3605.4mm/growing period in Metehara farm were obtained. Similarly, in Fincha estate farms, the sugarcane WF of 188.01 m 3 /t which composed of 67.45m 3 /t green, 113.42m 3 /t blue and 7.14m3 /t grey was recorded whereas the sugarcane WF of 239.11m3 /t which consist of the green 29.42m3 /t, blue 204.13m3 /t and 5.56m3 /t grey in Metehara estate farms was found. Hence, irrigation (blue WF) is the major concerning area to manage the water. The WF values are on the range of global average WF which is between 120 and 410m3 /t this indicates that the WF values are optimum and the result of the study is effective. The WF of bioethanol in Fincha estate farm was 2067.62L/L whereas 1441.54L/L in Metehara farm estate. Therefore, those values of WF of sugarcane indicated that they produce ample zone to improve WF of crops for sugar and bioethanol water use more efficiently and decrease the impact of fossil fuel on climate change.
Engineering and control of advanced optoelectronic materials for applications in quantum devices
Creators: name: Foster, Natalie Danielle
name: 0000-0003-1478-4582
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Nonlinear optics
Quantum materials

description: The challenges introduced by the miniaturization and growing demands of modern computing technology require advanced materials solutions that are both tunable and easy to characterize. As applications become more specialized thanks to improvements in fabrication capabilities, the complexity of these synthesized materials and devices increases dramatically, which demands a firm understanding of the dominant underlying physics. In this dissertation, we investigate three different artificially structured materials used in applications supporting quantum devices through optical and electronic techniques. In the first case, second harmonic generation (SHG) in reflection characterized the second order nonlinear susceptibility X⁽²⁾ in strained thin film Ba₁₋ₓSRₓTiO₃ alloys as a function of thickness and composition. We found that alloys containing a proportion of Sr between 10 and 40% were successfully able to sustain an out-of-plane polarization that allows them to be interfaced with existing Si platforms without suffering adverse interfacial defects. In the second study, we invoked azimuthal angle-dependent SHG to indirectly probe X⁽²⁾ of digital alloy-grown multiple quantum well structures composed of InAs and AlSb. We used an optical response matrix to model the multilayered structure and found that the consideration of complex X⁽²⁾ phase interference was crucial to accurately represent the data. The resulting model yielded a value of X⁽²⁾MQW 4 times greater than that of its bulk constituents, which opens possibilities for engineering more complex structures for optoelectronic applications. Finally, the rapid thermal anneal-driven electrical activation of Ga dopants implanted in Ge was evaluated using depth profiling and surface characterization techniques. By sufficiently healing lattice damage meanwhile avoiding dopant loss induced by annealing at temperatures too high, we found a usable range of anneal temperatures inducing electrical activation of dopants up to 64%. These findings have strong implications for the success of acceptor-based nuclear spin qubits in Ge, which hosts advantages to the quintessential Si in potential quantum computing platforms. Subsequently, we present preliminary spectral photoconductivity measurements of bound excitons in Ga-doped Ge as a viable path towards the development of a nuclear spin-based quantum computer. The works described here illuminate some of the ways that properly characterized solid state systems can be leveraged to support the next generation of modern computing devices.
A unique polar representation of the hyperanalytic signal
Creators: name: Huang, Boqiang
name: Kunoth, Angela
Publisher: name: arXiv
Year: 2014
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65-XX, 97N40, 94A12

description: The hyperanalytic signal is the straight forward generalization of the classical analytic signal. It is defined by a complexification of two canonical complex signals, which can be considered as an inverse operation of the Cayley-Dickson form of the quaternion. Inspired by the polar form of an analytic signal where the real instantaneous envelope and phase can be determined, this paper presents a novel method to generate a polar representation of the hyperanalytic signal, in which the continuously complex envelope and phase can be uniquely defined. Comparing to other existing methods, the proposed polar representation does not have sign ambiguity between the envelope and the phase, which makes the definition of the instantaneous complex frequency possible.
description: 2014 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
Unsteady State Kinetic Modelling of Biomass Gasification in Bubbling Fluidized Bed Gasifier
Creators: name: Tolossa Kebede Tulu
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Biomass gasification, Fluidized bed, Kinetic Modeling, Response surface, Optimization

description: From available renewable energy, biomass is the most abundant and promising resource of renewable energy which is environmental friendly. From biomass conversion methods to useful energy, gasification is an adequate technology. The mathematical modeling of biomass gasification in bubbling fluidized bed can be used to predict syngas composition and optimize the operational condition as well as gasifier design, which is a cost-saving option and viable routine. However, the kinetic modeling of biomass gasification is at early phase. With this regard, the aim of this study is to develop kinetic model based on two-phase fluidization theory, which is comprised of reaction kinetics, bed hydrodynamic parameters, diffusion effect, and species transport equations. Furthermore, the thermal cracking of tar was integrated into the model to increase the prediction accuracy of the model and to address the gap in knowledge. In this study, the transient kinetic modeling of biomass gasification in bubbling fluidized bed gasifiers and optimization methods to maximize gasification products were developed. The model was coded in Matlab and simulated. The result depicts good agreement with experimental work in literature. The sensitivity analysis carried out and the effect of temperature from 650oC-850oC and steam to biomass ratio (S/B) from 0.1-2 investigated. The result depicts the increase in temperature and S/B promotes H2 production and reduces CO and CH4. Furthermore, the regression model was carried out for temperature and S/B variation in Design-Expert. The surface response is constructed from the regression model and the mutual effect of temperature and S/B on gasification product and heating value investigated. Besides, the desirability function is employed to optimize gasification product and heating value. The maximum gasification product yield was at 827.866oC and 0.1 S/B in investigated range. The response predicted by desirability function at this optimum operational conditions is 30.096%, 44.07%, 13.20%, 12.90%, 14.035 (MJ/Nm3 ), and 14.536 (MJ/Nm3 ) for H2, CO, CO2, CH4, LHV, and HHV respectively.
Flexible SQLf query based on fuzzy linguistic summaries
Creators: name: Benali-Sougui, Ines
name: Sassi-Hidri, Minyar
name: Grissa-Touzi, Amel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Data is often partially known, vague or ambiguous in many real world applications. To deal with such imprecise information, fuzziness is introduced in the classical model. SQLf is one of the practical language to deal with flexible fuzzy querying in Fuzzy DataBases (FDB). However, with a huge amount of fuzzy data, the necessity to work with synthetic views became a challenge for many DB community researchers. The present work deals with Flexible SQLf query based on fuzzy linguistic summaries. We use the fuzzy summaries produced by our Fuzzy-SaintEtiq approach. It provides a description of objects depending on the fuzzy linguistic labels specified as selection criteria.
The Assembling and Utilizing of Economic Material in Program Building
Creators: name: Dixon, H. M.
Publisher: name: Unknown
Year: 1929
Subjects: Livestock Production/Industries
Teaching/Communication/Extension/Profession

description: Excerpt: Farm-management specialists, the same as other subject-matter workers, recognize their twofold responsibility of not only making their own project efficient but also of so relating it to the other extension activities as to make the full Extension Service program the most effective or efficient. In order to do this, we realize the importance of close and continuous contact with the other subject-matter workers. My purpose today, therefore, will be to set forth our program relating to the poultry industry, and I desire your suggestions both in regard to what is presented and what additional things your experience suggests that we might be doing.
description: Paper given at Poultry Science Association Meeting, Auburn, Ala., August 23, 1929.
Heisenberg model in pseudo-Euclidean spaces
Creators: name: Jovanovic, Bozidar
Publisher: name: arXiv
Year: 2014
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Symplectic Geometry (math.SG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 37J55, 37J35

description: We construct analogues of the classical Heisenberg spin chain model (or the discrete Neumann system) on pseudo-spheres and light-like cones in the pseudo-Euclidean spaces and show their complete Hamiltonian integrability. Further, we prove that the Heisenberg model on a light--like cone leads to a new example of integrable discrete contact system.
description: 6 pages
A lower bound on the Longitudinal Structure Function at small x from a self-similarity based model of Proton
Creators: name: Jahan, Akbari
name: Choudhury, D. K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Self-similarity based model of proton structure function at small \textit{x} was reported in the literature sometime back. The phenomenological validity of the model is in the kinematical region $ 6.2\, \times \, 10^{-7} \leq x \leq 10^{-2}$ and $ 0.045 \leq Q^{2} \leq 120 \, \mathrm{GeV^{2}} $. We use momentum sum rule to pin down the corresponding self-similarity based gluon distribution function valid in the same kinematical region. The model is then used to compute bound on the longitudinal structure function $F_{L}\left(x,Q^{2} \right)$ for Altarelli-Martinelli equation in QCD and is compared with the recent HERA data.
description: 10 pages, 3 figures. arXiv admin note: text overlap with arXiv:1004.1440 by other authors
Forest Law Enforcement, Governance, and Trade (FLEGT) implementation in Europe and Indonesia, and the implications of timber legality and deforestation policy changes in the EU, UK, USA and China. Final Study Report.
Creators: name: Berning, Laila
name: Sotirov, Metodi
name: Eckelmann, Johanne
name: Maryudi, Ahmad
name: Pratama, Andita Aulia
name: Laraswati, Dwi
Publisher: name: Zenodo
Year: 2022

description: The present report first examined the FLEGT policy’s functioning on the demand side in Europe (EU and UK) and non-European consumer regions (USA, Australia, and China) as well as on the supply side in Indonesia and other tropical countries. Second, newly emerging demand-side deforestation policy changes in Europe (EU, UK) and the US have been analysed. Third, the implications of the deforestation regulatory changes on reforms in Indonesia and other tropical countries have been assessed. Results are based on a comprehensive document analysis, surveys, and key informant interviews