cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Everyting changed in Egypt
Creators: name: Johnson, Roger
Publisher: name: Gaudium Sciendi
Year: 2020

description: A year’s Fulbright appointment at the University in Alexandria, Egypt, brought me, a relatively unknown scholar, and my family into a situation of great joy and gain, tempered with sorrow. It was the most profound experience of my professional career to date in 1982/83, the year after the murder of Sadat and the year of massacres in Sabra and Shatila. Teaching was, at first, difficult. The unacknowledged assumptions of Egyptian students and my own unacknowledged assumptions about truth and knowledge erected barriers to understanding; but each side learned from the other, a gratifying result. For my family, the year in Alexandria was life changing. We learned to cope with the absence of amenities we had taken for granted, and we learned that there was a world different from ours but one that deserved respect and accommodation. We learned to face daily life with more humor and flexibility, admiring a level of generosity we had never before experienced. We also learned about mental equilibrium, a recognition that some acceptance of fate seems healthy. We learned to value and cultivate calm in the midst of chaos.
description: Gaudium Sciendi, No 18 (2020)
Work fluctuations in a time-dependent harmonic potential: rigorous results and beyond the overdamped limit
Creators: name: Kwon, Chulan
name: Noh, Jae Dong
name: Park, Hyunggyu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the stochastic motion of a Brownian particle in the harmonic potential with a time-dependent force constant. It may describe the motion of a colloidal particle in an optical trap where the potential well is formed by a time-dependent field. We use the path integral formalism to solve the Langevin equation and the associated Fokker-Planck (Kramers) equation. Rigorous relations are derived to generate the probability density function for the time-dependent nonequilibrium work production beyond the overdamped limit. We find that the work distribution exhibits an exponential tail with a power-law prefactor, accompanied by an interesting oscillatory feature (multiple pseudo locking-unlocking transitions) due to the inertial effect. Some exactly solvable cases are also discussed in the overdamped limit.
description: 12 pages, 7 figures
Is magnetic chiral dichroism feasible with electron vortices?
Creators: name: Schattschneider, Peter
name: Löffler, Stefan
name: Stöger-Pollach, Michael
name: Verbeeck, Johan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We discuss the feasibility of detecting magnetic transitions with focused electron vortex probes, suggested by selection rules for the magnetic quantum number. We theoretically estimate the dichroic signal strength in the L$_{2,3}$ edge of the ferromagnetic d metals. It is shown that under realistic conditions, the dichroic signal is undetectable for nanoparticles larger than ~1 nm. This is confirmed by a key experiment with nanometer sized vortices.
My experience as a Fulbrighter: an appraisal of the Fulbright Program
Creators: name: Coelho, Carlos A.
Publisher: name: Gaudium Sciendi
Year: 2020

description: This writing is a simple text where the author states his feelings and appreciation for the Fulbright Program and his experience as a Fulbrighter.
description: Gaudium Sciendi, No 18 (2020)
Enhancement of critical temperatures in disordered bipartite lattices
Creators: name: Dell'Anna, Luca
Publisher: name: arXiv
Year: 2013
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the strong enhancement, induced by random hopping, of the critical temperatures characterizing the transitions to superconductivity, charge-density wave and antiferromagnetism, which can occur in bipartite lattice models at half-filling, like graphene, by means of an extended Finkel'stein non-linear $σ$-model renormalization group approach. We show that, if Cooper channel interaction dominates, superconducting critical temperature can be enhanced at will, since superconductivity cannot be broken by entering any Anderson insulating phase. If, instead, staggered interactions are relevant, antiferromagnetic order is generated by disorder at a temperature well above that expected for a clean system.
description: 7 pages, 4 figures, final version
Improving Situational Awareness in RoboFlag
Creators: name: Gu, Chunhui
Publisher: name: California Institute of Technology
Year: 2006
Subjects: RoboFlag
Monte Carlo Localization
Hospitability Map
situational awareness
Electrical Engineering

description: Situational awareness in competitive games has started to attract increasing attention in the control community. It studies how a robot identifies, understands and predicts the significant factors around it, which is essential for effective decision making and performance in any complex and dynamic environment. In this thesis, we investigate the situational awareness problems in RoboFlag, a highly dynamic testbed that comprises a mixture of offense and defense games between two robotic teams. To improve situational awareness in RoboFlag, we want to solve two main problems. (1) Real-time position estimation given limited sensing capability. (2) Optimal decision-making strategy based on position estimation.

Monte Carlo Localization (MCL), a statistical method based on particle representations of probability densities moving sequentially in discrete time, has been shown as an effective and time-efficient method for reliable position estimation, especially when the dynamics of the system and the environment are nonlinear and non-Gaussian, such as RoboFlag. In this thesis, a dynamic weight map, Hospitability Map (H-Map), that measures the ability of a target to move and maneuver at each location of the field, has been applied to MCL to enhance the efficiency and accuracy of MCL in resampling phase. Empirical results illustrate that H-Map based MCL method improves situational awareness in Roboflag by providing reliable position prediction and enhancing decisionmaking performance.
THREE-DIMENSIONAL MICROFABRICATION OF MECHANICAL METAMATERIALS VIA STEREOLITHOGRAPHY AND TWO-PHOTON POLYMERIZATION
Creators: name: Harinarayana, Vaidyanath
Publisher: name: Purdue University Graduate School
Year: 2022
Subjects: Mechanical engineering not elsewhere classified
Theory and design of materials

description: With the advent of femtosecond lasers in the early 1990s, ultrafast laser processing has proven to be an imperative tool for micro/nanomachining. Two-photon lithography (TPL) is one such unique microfabrication technique exploiting the nonlinear dependency of the polymerization rate on the irradiating light intensity to produce true three-dimensional structures with feature sizes beyond the diffraction limit. This characteristic has revolutionized laser material processing for the fabrication of micro and nanostructures. This research first gives a general overview of TPL, including its operating principle, experimental setup, compatible materials, and techniques for improving the final resolution of the fabricated structure. Insights to improve throughput and speed of fabrication to pave a way for the industrialization of this technique are provided. Following that, the report delves into the process of fabricating two true three-dimensional mechanical metamaterials via the stereolithography technique. This chapter encompasses the design, fabrication, and experimental analysis of a three-dimensional axisymmetric structure with elliptical perforations distributed periodically on the walls of the structure with varying thicknesses. Furthermore, this study discusses the significance of the elliptical perforations in terms of auxetic behavior and load-bearing capacity against a so-called plain structure under quasistatic compression loading. Finally, the report explores the technique of fabricating a true three-dimensional cylindrical auxetic structure via two-photon polymerization. This section of the report examines the optical setup utilized, the sample preparation procedure, and calibration experiments performed in order to fabricate a three-dimensional thin-walled right cylinder with bowtie like perforations arranged on the walls to promote the exhibition of symmetric negative Poisson’s ratio under uniaxial quasistatic compression loading.
A kinematic study of the Andromeda dwarf spheroidal system
Creators: name: Collins, Michelle L. M.
name: Chapman, Scott C.
name: Rich, R. Michael
name: Ibata, Rodrigo A.
name: Martin, Nicolas F.
name: Irwin, Michael J.
name: Bate, Nicholas F.
name: Lewis, Geraint F.
name: Peñarrubia, Jorge
name: Arimoto, Nobuo
name: Casey, Caitlin M.
name: Ferguson, Annette M. N.
name: Koch, Andreas
name: McConnachie, Alan W.
name: Tanvir, Nial
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a homogeneous kinematic analysis of red giant branch stars within 18 of the 28 Andromeda dwarf spheroidal (dSph) galaxies, obtained using the Keck I LRIS and Keck II DEIMOS spectrographs. Based on their g-i colors (taken with the CFHT MegaCam imager), physical positions on the sky, and radial velocities, we assign probabilities of dSph membership to each observed star. Using this information, the velocity dispersions, central masses and central densities of the dark matter halos are calculated for these objects, and compared with the properties of the Milky Way dSph population. We also measure the average metallicity ([Fe/H]) from the co-added spectra of member stars for each M31 dSph and find that they are consistent with the trend of decreasing [Fe/H] with luminosity observed in the Milky Way population. We find that three of our studied M31 dSphs appear as significant outliers in terms of their central velocity dispersion, And XIX, XXI and XXV, all of which have large half-light radii (>700 pc) and low velocity dispersions (sigma_v<5 km/s). In addition, And XXV has a mass-to-light ratio within its half-light radius of just [M/L]_{half}=10.3^{+7.0}_{-6.7}, making it consistent with a simple stellar system with no appreciable dark matter component within its 1 sigma uncertainties. We suggest that the structure of the dark matter halos of these outliers have been significantly altered by tides.
description: 41 pages, 23 figures. Accepted for publication in ApJ
Solubility of Iron in Metallic Hydrogen and Stability of Dense Cores in Giant Planets
Creators: name: Wahl, Sean
name: Wilson, Hugh F.
name: Militzer, Burkhard
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The formation of the giant planets in our solar system, and likely a majority of giant exoplanets, is commonly explained by the accretion of nebular hydrogen and helium onto a large core of terrestrial-like composition. The fate of this core has important consequences for the evolution of the interior structure of the planet. It has recently been shown that H2O, MgO and SiO2 dissolve in liquid metallic hydrogen at high temperature and pressure. In this study, we perform ab initio calculations to study the solubility of an innermost metallic core. We find dissolution of iron to be strongly favored above 2000 K over the entire pressure range (0.4-4 TPa) considered. We compare with and summarize the results for solubilities on other probable core constituents. The calculations imply that giant planet cores are in thermodynamic disequilibrium with surrounding layers, promoting erosion and redistribution of heavy elements. Differences in solubility behavior between iron and rock may influence evolution of interiors, particularly for Saturn-mass planets. Understanding the distribution of iron and other heavy elements in gas giants may be relevant in understanding mass-radius relationships, as well as deviations in transport properties from pure hydrogen-helium mixtures.
description: 8 pages, 5 figures, 2 tables. Submitted to the Astrophysical Journal on March 26, 2013
A quantum gravitational inflationary scenario in Bianchi-I spacetime
Creators: name: Gupt, Brajesh
name: Singh, Parampreet
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the $ϕ^2$ inflationary model in the Bianchi-I spacetime using effective spacetime description of loop quantum cosmology to understand the issues of the resolution of initial singularity, isotropization, effect of anisotropies on amount of inflation, and the phase space attractors in the presence of non-perturbative quantum gravitational modifications. A comparative analysis with the classical theory by including more general initial conditions than the ones previously considered in the latter is also performed. We show that, in general, the classical singularity is replaced by a bounce of the mean scale factor in loop quantum cosmology. Due to the underlying quantum geometric effects, the energy density of the inflaton and the anisotropic shear remain bounded throughout the non-singular evolution. Starting from arbitrary anisotropic initial conditions, a loop quantum universe isotropizes either before or soon after the onset of slow-roll inflation. We find a double attractor behavior in the phase space dynamics of loop quantum cosmology, similar to the one in classical theory, but with some additional subtle features. Quantum modifications to the dynamical equations are such that, unlike the classical theory, the amount of inflation does not monotonically depend on the initial anisotropy in loop quantum cosmology. Our results suggest that a viable non-singular inflationary model can be constructed from highly anisotropic initial conditions in the Planck regime.
description: 35 pages, 19 figures. References added. Minor changes to match published version. To appear in CQG
On the Galerkin / finite-element method for the Serre equations
Creators: name: Mitsotakis, Dimitrios
name: Ilan, Boaz
name: Dutykh, Denys
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Physics (physics.class-ph)
subject: Analysis of PDEs (math.AP)
subject: Numerical Analysis (math.NA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: A highly accurate numerical scheme is presented for the Serre system of partial differential equations, which models the propagation of dispersive shallow water waves in the fully-nonlinear regime. The fully-discrete scheme utilizes the Galerkin / finite-element method based on smooth periodic splines in space, and an explicit fourth-order Runge-Kutta method in time. Computations compared with exact solitary and cnoidal wave solutions show that the scheme achieves the optimal orders of accuracy in space and time. These computations also show that the stability of this scheme does not impose restrictive conditions on the temporal step size. In addition, solitary, cnoidal, and dispersive shock waves are studied in detail using this numerical scheme for the Serre system and compared with the 'classical' Boussinesq system for small-amplitude shallow water waves. The results show that the interaction of solitary waves in the Serre system is more inelastic. The efficacy of the numerical scheme for modeling dispersive shocks is shown by comparison with asymptotic results. These results have application to the modeling of shallow water waves of intermediate or large amplitude, such as occurs in the nearshore zone.
description: 34 pages, 20 figures, 10 tables, 42 references. Other author's papers can be downloaded at http://www.denys-dutykh.com/
Octopus as predators of abalone on a sea ranch
Creators: name: Greenwell, CN
name: Loneragan, NR
name: Admiraal, Ryan
name: Tweedley, JR
name: Wall, M
Publisher: name: Open Access Victoria University of Wellington | Te Herenga Waka
Year: 2021
Subjects: subject: 140299 Applied Economics not elsewhere classified
subject: FOS: Economics and business
subject: 70499 Fisheries Sciences not elsewhere classified
subject: FOS: Agriculture, forestry and fisheries
subject: Ecology
subject: FOS: Biological sciences

description: This study examined the occurrence of octopus across an abalone, Haliotis laevigata, Donovan, sea ranch in south-western Australia, to understand how octopus may be impacting abalone production. Commercial divers removed 654 octopus and 17,666 empty abalone shells during regular, 2 to 4-weekly surveys over 27 months. A negative binomial generalised linear model estimated a 78% increase in empty shells per artificial abalone habitat per day, when octopuses were present, after adjusting for location and season. Of the 408 shells examined for evidence of predation, 19% had a small, slightly ovoid hole consistent with those made by octopus. The mean (± 1 SE) length of shells with boreholes (70.3 ± 2.2 mm) was significantly longer than those without (59.8 ± 0.5 mm), and boreholes were concentrated over the adductor, respiratory organs and heart. This study provides important insights into the adaptable feeding regimes of octopus and their potential to impose strong top-down controls on sea ranching operations.
Normal state properties of spin-orbit coupled Fermi gases in the upper branch of energy spectrum
Creators: name: Yu, Xiao-Lu
name: Zhang, Shang-Shun
name: Liu, Wu-Ming
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate normal state properties of spin-orbit coupled Fermi gases with repulsive s-wave interaction, in the absence of molecule formation, i.e., in the so-called "upper branch". Within the framework of random phase approximation, we derive analytical expressions for the quasi-particle lifetime $τ_s$, the effective mass $m_s^*$, and the Green's function renormalization factor $Z_s$ in the presence of Rashba spin-orbit coupling. In contrast to spin-orbit coupled electron gas with Coulomb interaction, we show that the modifications are dependent on the Rashba band index s, and occur in the first order of the spin-orbit coupling strength. We also calculate experimental observable such as spectral weight, density of state and specific heat, which exhibit significant differences from their counterparts without spin-orbit coupling. We expect our microscopic calculations of these Fermi liquid parameters would have the immediate applications to the spin-orbit coupled Fermi gases in the upper branch of the energy spectrum.
The Onset of Differentiation and Internal Evolution: the case of 21 Lutetia
Creators: name: Formisano, M.
name: Turrini, D.
name: Federico, C.
name: Capaccioni, F.
name: De Sanctis, M. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Asteroid 21 Lutetia, visited by the Rosetta spacecraft, plays a crucial role in the reconstruction of primordial phases of planetary objects. Its high bulk density and its primitive chondritic crust (Weiss et al. 2011) suggest that Lutetia could be partially differentiated. We developed a numerical code, also used for studying the geophysical history of Vesta (Formisano et al., submitted), to explore several scenarios of internal evolution of Lutetia, differing in the strength of radiogenic sources and in the global post-sintering porosity. The only significant heat source for partial differentiation is represented by Al26, the other possible sources (Fe60, accretion and differentiation) being negligible. In scenarios in which Lutetia completed its accretion in less than 0.7 Ma from injection of Al26 in Solar Nebula and for post-sintering values of macroporosity not exceeding 30 vol. %, the asteroid experienced only partial differentiation. The formation of the proto-core, a structure enriched in metals and also containing pristine silicates, requires from 1 to 4 Ma: the size of the proto-core varies from 6 to 30 km.
description: 12 pages, 2 tables, 4 figures. Accepted for publication on The Astrophysical Journal
The Next Generation Transit Survey (NGTS)
Creators: name: Wheatley, Peter J.
name: Pollacco, Don L.
name: Queloz, Didier
name: Rauer, Heike
name: Watson, Christopher A.
name: West, Richard G.
name: Chazelas, Bruno
name: Louden, Tom M.
name: Walker, Simon
name: Bannister, Nigel
name: Bento, Joao
name: Burleigh, Matthew
name: Cabrera, Juan
name: Eigmueller, Philipp
name: Erikson, Anders
name: Genolet, Ludovic
name: Goad, Michael
name: Grange, Andrew
name: Jordan, Andres
name: Lawrie, Katherine
name: McCormac, James
name: Neveu, Marion
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The Next Generation Transit Survey (NGTS) is a new ground-based sky survey designed to find transiting Neptunes and super-Earths. By covering at least sixteen times the sky area of Kepler we will find small planets around stars that are sufficiently bright for radial velocity confirmation, mass determination and atmospheric characterisation. The NGTS instrument will consist of an array of twelve independently pointed 20cm telescopes fitted with red-sensitive CCD cameras. It will be constructed at the ESO Paranal Observatory, thereby benefiting from the very best photometric conditions as well as follow up synergy with the VLT and E-ELT. Our design has been verified through the operation of two prototype instruments, demonstrating white noise characteristics to sub-mmag photometric precision. Detailed simulations show that about thirty bright super-Earths and up to two hundred Neptunes could be discovered. Our science operations are due to begin in 2014.
description: Submitted to the conference proceedings of the RoPACS meeting "Hot Planets and Cool Stars" (Nov. 2012, Garching), 4 pages, 2 colour figures
Winged rocket performance analysis
Creators: name: Shonerd, David E.
Publisher: name: California Institute of Technology
Year: 1949
Subjects: Aeronautics

description: A method is presented for estimating the effects of various parameters on the performance of a winged rocket. A program for studying three specific parameters, i.e., wing areas, reduced thrust cruising programs, and trajectory climb angles, and their effect on the horizontal range of a winged rocket is presented. Complete calculations are carried out for one combination of these parameters.

An analysis of the Lift, Drag and Stability characteristics of a long, slender rocket with trapezoidal fins and wings is made. The stabilizing effectiveness of delta and trapezoidal fins is compared.

Simplified approximate methods of integrating the trajectory equations by step-by-step method are presented.
Eliminating cracking during drying
Creators: name: Jin, Qiu
name: Tan, Peng
name: Schofield, Andrew B.
name: Xu, Lei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: When colloidal suspensions dry, stresses build up and cracks often occur - a phenomenon undesirable for important industries such as paint and ceramics. We demonstrate an effective method which can completely eliminate cracking during drying: by adding emulsion droplets into colloidal suspensions, we can systematically decrease the amount of cracking, and eliminate it completely above a critical droplet concentration. Since the emulsion droplets eventually also evaporate, our technique achieves an effective function while making little changes to the component of final product, and may therefore serve as a promising approach for cracking elimination. Furthermore, adding droplets also varies the speed of air invasion and provides a powerful method to adjust drying rate. With the effective control over cracking and drying rate, our study may find important applications in many drying and cracking related industrial processes.
description: 5 pages, 5 figures
title: Социальное взаимодействие в профессиональной деятельности
Creators: name: ELS IPR BOOKS
Publisher: name: Таганрогский институт управления и экономики
Year: 2022

description: В учебном пособии представлены материалы по различным аспектам и проблемам социального взаимодействия. Анализируются сущностные характеристики и виды социального взаимодействия, его место в системе профессиональной деятельности, а также в управлении работой команды и разрешении различного рода конфликтов. Издание предназначено для студентов всех направлений подготовки бакалавриата, изучающих дисциплины «Социальное взаимодействие», «Командообразование», «Управление конфликтами», а также для преподавателей гуманитарных и управленческих дисциплин, теоретиков и практиков, интересующихся проблемами социального взаимодействия в профессиональной деятельности.
A first-principles linear response description of the spin Nernst effect
Creators: name: Wimmer, S.
name: Ködderitzsch, D.
name: Chadova, K.
name: Ebert, H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A first-principles description of the spin Nernst effect, denoting the occurrence of a transverse spin current due to a temperature gradient, is presented. The approach, based on an extension to the Kubo-Streda equation for spin transport, supplies in particular the formal basis for investigations of diluted as well as concentrated alloys. Results for corresponding applications to the alloy system Au-Cu give the intrinsic and extrinsic contributions to the relevant transport coefficients. Using scaling laws allows in addition to split the extrinsic contribution into its skew scattering and side-jump parts.
description: 5 pages, 3 figures; Supplemental Material available at http://arxiv.org/abs/1311.5047
An object detection approach for lane change and overtake detection from motion profiles
Creators: name: Benericetti, Andrea
name: Bellaccini, Niccolò
name: Monteagudo, Henrique Piñeiro
name: Simoncini, Matteo
name: Sambo, Francesco
Publisher: name: arXiv
Year: 2025
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In the application domain of fleet management and driver monitoring, it is very challenging to obtain relevant driving events and activities from dashcam footage while minimizing the amount of information stored and analyzed. In this paper, we address the identification of overtake and lane change maneuvers with a novel object detection approach applied to motion profiles, a compact representation of driving video footage into a single image. To train and test our model we created an internal dataset of motion profile images obtained from a heterogeneous set of dashcam videos, manually labeled with overtake and lane change maneuvers by the ego-vehicle. In addition to a standard object-detection approach, we show how the inclusion of CoordConvolution layers further improves the model performance, in terms of mAP and F1 score, yielding state-of-the art performance when compared to other baselines from the literature. The extremely low computational requirements of the proposed solution make it especially suitable to run in device.
description: 6 pages, 3 figures
Michéline
Creators: name: Abellard, Darleine
Publisher: name: California Institute of Technology
Year: 2025
Subjects: Mary A. Earl McKinney Prize in Literature
English
Mary A. Earl McKinney Prize in Literature - Prose Fiction
Hixon Writing Center

description: Background: How do you tell the story of white supremacy, racial capitalism, settler colonialism, transatlantic chattel slavery, and tell a story that cares for BIPOC (Black, indigenous, and people of color) lives? A story that honors the lives of those who were not supposed to survive, no less thrive? Bernardine Evaristo’s Girl, Woman, Other is a work that successfully embodies such a practice of care amid precarity. While the novel ends with an epilogue, we know, as scholars of Black studies, that the Black diaspora has not ended and that many of the stories of its diverse kin have yet to be told.
Numerical Simulations of Bubble-Induced Star Formation in Dwarf Irregular Galaxies with a Novel Stellar Feedback Scheme
Creators: name: Kawata, Daisuke
name: Gibson, Brad K.
name: Barnes, David J.
name: Grand, Robert J. J.
name: Rahimi, Awat
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: To study the star formation and feedback mechanism, we simulate the evolution of an isolated dwarf irregular galaxy (dIrr) in a fixed dark matter halo, similar in size to WLM, using a new stellar feedback scheme. We use the new version of our original N-body/smoothed particle chemodynamics code, GCD+, which adopts improved hydrodynamics, metal diffusion between the gas particles and new modelling of star formation and stellar wind and supernovae (SNe) feedback. Comparing the simulations with and without stellar feedback effects, we demonstrate that the collisions of bubbles produced by strong feedback can induce star formation in a more widely spread area. We also demonstrate that the metallicity in star forming regions is kept low due to the mixing of the metal-rich bubbles and the metal-poor inter-stellar medium. Our simulations also suggest that the bubble-induced star formation leads to many counter-rotating stars. The bubble-induced star formation could be a dominant mechanism to maintain star formation in dIrrs, which is different from larger spiral galaxies where the non-axisymmetric structures, such as spiral arms, are a main driver of star formation.
description: 17 pages, 15 figures, significantly revised version, including our philosophy of sub-grid modelling, accepted for publication in MNRAS
The Influence of Négritude and Black Postcolonial Thought on Derek Walcott’s The Odyssey: A Play
Creators: name: Kunnam, Shwetha S.
Publisher: name: California Institute of Technology
Year: 2023
Subjects: Gordon McClure Memorial Communications Prize
Gordon McClure Memorial Communications Prize in English
English
Hixon Writing Center

description: [Introduction] Derek Walcott’s The Odyssey: A Play is an homage to both Homer’s Odyssey and the anti-colonial Négritude literary movement, which aimed to spread African cultural values and the centering of Black identity to the broader African diaspora. Walcott modifies the original Odyssey to include elements of his own St. Lucian heritage through the strategic addition of Afro-Caribbean language, characters, such as the narrator Billy Blue, spiritual traditions, and more modern anti-colonial ideas developed by the African diaspora. However, Walcott’s attempt to weave together postcolonial modes of thought and Homer’s Odyssey fails to capture the limited depth Homer imbues in his female characters. The shortcomings of the Négritude movement with respect to women, particularly women of color, are seen in the way Walcott writes nonwhite female characters, such as the slave Eurycleia and the enchantress Circe, as either caretakers (“mammies”) or seductresses (“jezebels”), stripping them of their agency and reducing them to stereotypes.
QCD gauge symmetries through Faddeev-Jackiw symplectic method
Creators: name: Abreu, Everton M. C.
name: Mendes, Albert C. R.
name: Neves, Clifford
name: Oliveira, Wilson
name: Silva, Rodrigo C. N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The interactions between gluons are important in theories such as quantum chromodynamics. Therefore, to rediscover new features of well known methods in order to investigate the SU(3) gauge group can be a new way to deal with Yang-Mills theories. In this work we analyzed YM theories through the well known Faddeev-Jackiw formalism for constrained systems. Besides, we showed precisely that having U(1) Maxwell electromagnetic theory as a starting point we can construct SU(3)-like and SU(3) X SU(2) X U(1) non-Abelian theories.
description: 10 pages. Final version to appear in JHEP
Dismantling The Help: The Hollywoodization of The Civil Rights Movement in 1963
Creators: name: Mendoza, Aramis J.
Publisher: name: California Institute of Technology
Year: 2025
Subjects: Gordon McClure Memorial Communications Prize
Gordon McClure Memorial Communications Prize in History
Hixon Writing Center
History

description: [Introduction] The Help directed by Tate Taylor and based off Kathryn Stockett’s novel portrays an incomplete narrative of Black women’s domestic work in white households through a white feminist lens under the backdrop of the 1963 Civil Rights Movement. While the movie seeks to show the perspective of these Black women often ignored throughout history, the movie instead focuses largely on an upcoming white woman writer named Skeeter. To shape Skeeter’s
ultimate writing success story, the movie utilizes the Civil Rights Movement and the Black domestic workers, mainly Aibileen and Minny, to jumpstart Skeeter’s writing career, subsequently leaving the Black community to deal with the aftermath of the publication of Skeeter’s novel. Based in Jackson, Mississippi, The Help details the racial turmoil of the time through the grossly comic portrayal of outdoor bathrooms for the domestic workers, the unrealistic arrest of Yule Mae Davis, and the turbulent assassination of Medgar Evers. While Medgar Evers killing was historically accurate, the oversimplification of white allyship, Black
resistance, and the softening of segregation and discrimination allow the audience to feel a false sense of accomplishment at the end of the movie which would realistically end in bloodshed. Although The Help builds its story around various key aspects of the Civil Rights movement in 1963, the movie substantially underplays the intensity of discrimination against Black people by heavily filtering the movement to craft an agreeable Hollywood narrative.
Axially symmetric laminar compressible boundary layers with pressure gradient : joint thesis
Creators: name: Imster, Harry Frederick
Publisher: name: California Institute of Technology
Year: 1948
Subjects: Aeronautics

description: Previous work on the subject of laminar compressible boundary layers has considered the flat plate without a pressure gradient (Karmen, Emmons and Brainerd), the flat plate with a pressure gradient (Illingworth), and the cone without pressure gradient (Hantzsche and Wendt). It is the purpose of this investigation to determine the effect of pressure gradient on the boundary layer thickness and skin friction for a figure of revolution in compressible flow.

The basic momentum, continuity, and energy equations of viscous, compressible flow are reduced to an approximate form in the neighborhood of the surface of a figure of revolution by the usual boundary layer assumptions and the particular assumptions that no heat is transferred between the figure of revolution and the fluid and that the Prandtl number is equal to unity. An integral relation is then developed for the approximate equations and is subsequently reduced to a differential equation in which the boundary layer thickness is the dependent variable. In addition to considering the case of compressible flow with a pressure gradient, three other cases are examined in order to aid in the interpretation of the results. These are: compressible flow with no pressure gradient, and incompressible flow with and without pressure gradient. The equations are then applied to a figure of revolution over which pressure distributions have been experimentally determined at two Mach numbers and two Reynolds numbers. The resulting boundary layer thickness distributions are then used to determine the skin friction drag for the various cases.

The effects of boundary layer velocity profile relation on skin friction drag coefficient are considered in some detail.

The results of the investigation indicate that the usual practice of applying flat plate laminar skin friction drag coefficients (either compressible or incompressible) to figures of revolution in supersonic flow may be unconservative by a considerable margin. It is also shown that resulting drag values are considerably dependent on the boundary conditions used to obtain the boundary layer velocity profile.
The Distribution of Alpha Elements in Ultra-Faint Dwarf Galaxies
Creators: name: Vargas, Luis C.
name: Geha, Marla
name: Kirby, Evan N.
name: Simon, Joshua D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Milky Way ultra-faint dwarf galaxies (UFDs) contain some of the oldest, most metal-poor stars in the Universe. We present [Mg/Fe], [Si/Fe], [Ca/Fe], [Ti/Fe], and mean [alpha/Fe], abundance ratios for 61 individual red giant branch stars across 8 UFDs. This is the largest sample of alpha abundances published to date in galaxies with absolute magnitudes M_V > -8, including the first measurements for Segue 1, Canes Venatici II, Ursa Major I, and Leo T. Abundances were determined via medium-resolution Keck/DEIMOS spectroscopy and spectral synthesis. The sample spans the metallicity range -3.4 < [Fe/H] < -1.1. With the possible exception of Segue 1 and Ursa Major II, the individual UFDs show on average lower [alpha/Fe] at higher metallicities, consistent with enrichment from Type Ia supernovae. Thus even the faintest galaxies have undergone at least a limited level of chemical self-enrichment. Together with recent photometric studies, this suggests that star formation in the UFDs was not a single burst, but instead lasted at least as much as the minimum time delay of the onset of Type Ia supernovae (~100 Myr) and less than ~2 Gyr. We further show that the combined population of UFDs has an [alpha/Fe] abundance pattern that is inconsistent with a flat, Galactic halo-like alpha abundance trend, and is also qualitatively different from that of the more luminous CVn I dSph, which does show a hint of a plateau at very low [Fe/H].
description: 14 pages, 6 figures, re-submitted to ApJ with revisions based on referee report
DESACRALIZATION OF LINGUISTIC WORLDVIEW: CASE STUDY OF THE PROVERB: "DO NOT DIG A HOLE FOR SOMEBODY ELSE, YOU YOURSELF WILL FALL INTO IT"
Creators: name: Salikhova Elvina, A.
name: Kushnareva Anna, V.
Publisher: name: Modern European Researches
Year: 2022
Subjects: DESACRALIZATION
IDIOM
LINGUISTIC CONSCIOUSNESS
LINGUISTIC WORLDVIEW
NEOPAREMIAS
PAREMIOLOGICAL VIEW OF THE WORLD
PROVERBS

description: The purpose of the paper is to describe the process of the axiological significance loss of paremiological units. The results of psycholinguistic (associative) experiments reconstruct the specific character of the actualization of the psychological meaning of a word in the individual’s linguistic consciousness. Such an approach is also very promising in the study of associations for fixing the active transformation of individual sectors of the idiomatic fund, in which the linguistic division of the world is correlated with the associative fields typology. The paremiological worldview reflects culturally based image of the world, once fixed in idiomatic meanings, and conventionalized in the cognitive mechanisms of their correlation with the value dominants of Russian linguistic culture. Language, by means of fixed paremiological units, is accumulating and translating the ways of formation and existence of knowledge about reality. A set of the latter in the individual, group consciousness makes up a picture of the world.
Assessing Interpolation Methods for Accuracy of Design Groundwater Levels for Civil Projects
Creators: name: Zirakbash, T
name: Admiraal, Ryan
name: Boronina, A
name: Anda, M
name: Bahri, PA
Publisher: name: Open Access Victoria University of Wellington | Te Herenga Waka
Year: 2021
Subjects: subject: 90599 Civil Engineering not elsewhere classified
subject: FOS: Civil engineering

description: This research compared natural neighbor interpolation with other interpolation methods commonly implemented in ArcGIS. It evaluated the relative performance of interpolation methods for various spatial data distributions, including line transects. It characterized locations which are associated with large prediction errors. To assess the relative performance of interpolation methods, a validation procedure was used consisting of 75% training data and 25% test data. Statistical error measures were used to measure the predictive performance of the interpolation methods, and the spatial distribution of errors was used to characterize areas where interpolation methods performed poorly. Results showed that Topo to Raster, natural neighbor, ordinary kriging, and empirical Bayesian kriging methods consistently outperformed other interpolation methods for a variety of spatial distributions of the data. However, natural neighbor interpolation was unsuitable for linear transects. In general, the accuracy of most of the interpolation methods increased with narrow spatial data distributions. Spatial distribution of large prediction errors was predominantly similar, regardless of the interpolation method used, and was related to changes in physical characteristics.
The Inherent Randomness of Evolving Populations
Creators: name: Harper, Marc
Publisher: name: arXiv
Year: 2013
Subjects: subject: Dynamical Systems (math.DS)
subject: Information Theory (cs.IT)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences
subject: 91A22, 94A15

description: The entropy rates of the Wright-Fisher process, the Moran process, and generalizations are computed and used to compare these processes and their dependence on standard evolutionary parameters. Entropy rates are measures of the variation dependent on both short-run and long-run behavior, and allow the relationships between mutation, selection, and population size to be examined. Bounds for the entropy rate are given for the Moran process (independent of population size) and for the Wright-Fisher process (bounded for fixed population size). A generational Moran process is also presented for comparison to the Wright-Fisher Process. Results include analytic results and computational extensions.
Determination of temperature in a low pressure flame
Creators: name: Lobdell, John Henry
Publisher: name: California Institute of Technology
Year: 1951
Subjects: Aeronautics

description: The extended dimensions of a flame zone which result from reducing the ambient pressure below 10 mm. Hg provide possibility for detailed investigation of flame chemistry and thermodynamics. The present investigation constitutes the first part of a detailed survey of the temperature distribution in an oxy—acetylene flame and describes the instrumentation and development of the modified Schmidt Technique for measuring flame temperature and the measurement of the maximum temperature in the flame.

The results indicate the maximum flame temperature to be within plus or minus 30°C. of the equilibrium flame temperature at 4.3 mm. Hg. The technique developed, while laborious, may be used to determine flame temperature with a good degree of accuracy.

The work was carried on with the financial support of the U. S. Army Ordnance Corps and the U. S. Air Force Air Materiel Command as part of a study of low pressure combustion under way at the Jet Propulsion Laboratory.
Many Bosons in a Narrow Magnetic Feshbach Resonance
Creators: name: Pricoupenko, Ludovic
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: The many-boson problem in presence of an asymptotically narrow Feshbach resonance is considered. The low energy properties are investigated using a two-channel Hamiltonian. The energy spectrum of this model is shown to be bounded from below in the limit of zero range interaction. This implies the promising possibility of achieving a strongly interacting bosonic phase in a dilute regime where the details of the actual interatomic forces are irrelevant. The integral relation between the energy and the one-body momentum distribution is derived.
Root separation for reducible integer polynomials
Creators: name: Bugeaud, Yann
name: Dujella, Andrej
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11C08, 11J04

description: We construct parametric families of (monic) reducible polynomials having two roots very close to each other.
description: 13 pages, to appear in Acta Arith
HOW MONEY TURNOVER AFFECTS THE CREDIT PROCESSES
Creators: name: Pogrebnyak Artemiy, A.
Publisher: name: Modern European Researches
Year: 2022
Subjects: CREDIT
MONEY TURNOVER
BEHAVIORAL ECONOMICS
LENDING CYCLE
HUMAN FACTOR

description: Adam Smith defended the idea that the market was born spontaneously. The market would be inherent in human activity. "Natural inclination to all people: to barter and exchange one thing for another". Exchange is therefore at the origin of the organization of human societies, even before capitalism appeared. The market emerged from its marginality between the twelfth and eighteenth centuries in Western societies, when it could be organized, monitored, regulated. The market is therefore a matter for institutions. It is considered that the economy is developing in the direction of systematization and structuring while not having an exact classification (humanities or technical science), and yet it should be understood that despite the accuracy of economics from the point of view of mathematics, this matter is still not accurate and moderately abstract. The main economic problem is the limited resources with an infinite need for them, which is what many economists are trying to “mitigate” by developing theories and patterns of actions where a need for something is the motive of economic activity. It is evident that the amount of money in the world is limited which means that it is possible that people use the exact same banknotes all over the world but what is the chance to have the same bill two times per life? This article provides the economic basis for understanding the beforementioned probability and it’s bound with credit system which is quite important in the modern society.
Stabilizer quantum error correction toolbox for superconducting qubits
Creators: name: Nigg, Simon E.
name: Girvin, Steven M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a general protocol for stabilizer measurements and pumping in a system of N superconducting qubits. We assume always-on, equal dispersive couplings to a single mode of a high-Q microwave resonator in the ultra-strong dispersive limit where the dispersive shifts largely exceed the spectral linewidth. In this limit, we show how to map the two eigenvalues of an arbitrary weight M < N Pauli operator, onto two quasi-orthogonal coherent states of the cavity. Together with a fast cavity readout, this enables the efficient measurement of stabilizer operators.
description: 16 pages, 10 figures, includes supplemental material. Revised manuscript