cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Equilibrium and nonequilibrium thermodynamics of particle-stabilized thin liquid films
Creators: name: Blawzdziewicz, J.
name: Wajnryb, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Our recent quasi-two-dimensional thermodynamic description of thin-liquid films stabilized by colloidal particles is generalized to describe nonuniform equilibrium states of films in external potentials and nonequilibrium transport processes produced in the film by gradients of thermodynamic forces. Using a Monte--Carlo simulation method, we have determined equilibrium equations of state for a film stabilized by a suspension of hard spheres. Employing a multipolar-expansion method combined with a flow-reflection technique, we have also evaluated the short-time film-viscosity coefficients and collective particle mobility.
description: 16 pages, 10 figures
Survival of icy grains in debris discs. The role of photosputtering
Creators: name: Grigorieva, Anna
name: Thebault, Ph.
name: Artymowicz, P.
name: Brandeker, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We put theoretical constraints on the presence and survival of icy grains in debris discs. Particular attention is paid to UV sputtering of water ice, which has so far not been studied in detail in this context. We present a photosputtering model based on available experimental and theoretical studies. We quantitatively estimate the erosion rate of icy and ice-silicate grains, under the influence of both sublimation and photosputtering, as a function of grain size, composition and distance from the star. The effect of erosion on the grain's location is investigated through numerical simulations coupling the grain size to its dynamical evolution. Our model predicts that photodesorption efficiently destroy ice in optically thin discs, even far beyond the sublimation snow line. For the reference case of beta Pictoris, we find that only > 5mm grains can keep their icy component for the age of the system in the 50-150AU region. When taking into account the collisional reprocessing of grains, we show that the water ice survival on grains improves (grains down to ~ 20 um might be partially icy). However, estimates of the amount of gas photosputtering would produce on such a hypothetical population of big icy grains lead to values for the OI column density that strongly exceed observational constraints for beta Pic, thus ruling out the presence of a significant amount of icy grains in this system. Erosion rates and icy grains survival timescales are also given for a set of 11 other debris disc systems. We show that, with the possible exception of M stars, photosputtering cannot be neglected in calculations of icy grain lifetimes.
description: 12 pages, 9 figures. accepted by A&A
Touring the MetaCoq Project (Invited Paper)
Creators: name: Sozeau, Matthieu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Programming Languages (cs.PL)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Proof assistants are getting more widespread use in research and industry to provide certified and independently checkable guarantees about theories, designs, systems and implementations. However, proof assistant implementations themselves are seldom verified, although they take a major share of the trusted code base in any such certification effort. In this area, proof assistants based on Higher-Order Logic enjoy stronger guarantees, as self-certified implementations have been available for some years. One cause of this difference is the inherent complexity of dependent type theories together with their extensions with inductive types, universe polymorphism and complex sort systems, and the gap between theory on paper and practical implementations in efficient programming languages. MetaCoq is a collaborative project that aims to tackle these difficulties to provide the first fully-certified realistic implementation of a type checker for the full calculus underlying the Coq proof assistant. To achieve this, we refined the sometimes blurry, if not incorrect, specification and implementation of the system. We show how theoretical tools from this community such as bidirectional type-checking, Tait-Martin-Löf/Takahashi's confluence proof technique and monadic and dependently-typed programming can help construct the following artefacts: a specification of Coq's syntax and type theory, the Polymorphic Cumulative Calculus of (Co)-Inductive Constructions (PCUIC); a monad for the manipulation of raw syntax and interaction with the Coq system; a verification of PCUIC's metatheory, whose main results are the confluence of reduction, type preservation and principality of typing; a realistic, correct and complete type-checker for PCUIC; a sound type and proof erasure procedure from PCUIC to untyped lambda-calculus, i.e., the core of the extraction mechanism of Coq.
description: In Proceedings LFMTP 2021, arXiv:2107.07376
Planar Vacuum Diode With Monoenergetic Electrons
Creators: name: Stoyanov, Dimitar G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Physics (physics.gen-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The paper analyses volt-ampere characteristics of a planar vacuum diode with mono-energetic electrons, emitted by the cathode (an electron beam). The movement of the electron beam in the volume of the diode is described. An analytic dependence of the volt-ampere characteristics in an unlimited and limited by the field mode of the electron beam is derived.
description: 14 pages, 4 figures
The external debt of Southeast Asia
Creators: name: Switucha, Ulana Tamara
Publisher: name: University of British Columbia
Year: 2010

description: In recent years the accumulation of debt by the underdeveloped nations has developed into a major issue in international relations. The question of debt concerns the pace and composition of borrowing by the developing nations as well as the impact of the accumulated debt burden on the development of the economy. The structure of a country's external debt is further related to the effect of this debt on the nation's interaction with other nations, in particular the developed economies. The purpose of this thesis is to examine the issue of debt in light of the experience of the five member nations of the Association of Southeast Asian Nations (ASEAN): Indonesia, Malaysia, the Philippines, Singapore, and Thailand. ASEAN's experience with debt, with particular reference to each member-state's relationship with its creditors will be the focus of the ensuing evaluation and discussion. The thesis has been designed to provide a case study of debt for a group of developing countries and examine the strategy used by those states to alter their position in the international economic and financial system.
MPEC 2025-G56 : 2025 GK
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 GK

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
The web-PLOP observation prioritisation system
Creators: name: Snodgrass, Colin
name: Tsapras, Yiannis
name: Street, Rachel
name: Bramich, Daniel
name: Horne, Keith
name: Dominik, Martin
name: Allan, Alasdair
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a description of the automated system used by RoboNet to prioritise follow up observations of microlensing events to search for planets. The system keeps an up-to-date record of all public data from OGLE and MOA together with any existing RoboNet data and produces new PSPL fits whenever new data arrives. It then uses these fits to predict the current or future magnitudes of events, and selects those to observe which will maximise the probability of detecting planets for a given telescope and observing time. The system drives the RoboNet telescopes automatically based on these priorities, but it is also designed to be used interactively by human observers. The prioritisation options, such as telescope/instrument parameters, observing conditions and available time can all be controlled via a web-form, and the output target list can also be customised and sorted to show the parameters that the user desires. The interactive interface is available at http://www.artemis-uk.org/web-PLOP/
description: 4 pages, Manchester Microlensing Conference, January 2008. To be published in the proceedings
TEACHER LEADERSHIP STYLES AND STUDENT PSYCHOLOGICAL CHARACTERISTICS AFFECTING THE STUDY METHODS OF  UNDATION ENGLISH COURSES IN HIGHER EDUCATION: A CASE STUDY OF EDUCATION AND HUMANITY/LIBERAL ARTS STUDENTS IN THAILAND
Creators: name: Siriporn Seritanondh
Publisher: name: Behavioral Science Research Institute,SWU.
Year: 2013
Subjects: teacher leadership,study methods,student psychological characteristics,foundation English courses

description: 1, 8, INTERNATIONAL JOURNAL OF BEHAVIORAL SCIENCE
Searching for a practical evidence of the No Free Lunch theorems
Creators: name: Oltean, Mihai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: According to the No Free Lunch (NFL) theorems all black-box algorithms perform equally well when compared over the entire set of optimization problems. An important problem related to NFL is finding a test problem for which a given algorithm is better than another given algorithm. Of high interest is finding a function for which Random Search is better than another standard evolutionary algorithm. In this paper, we propose an evolutionary approach for solving this problem: we will evolve test functions for which a given algorithm A is better than another given algorithm B. Two ways for representing the evolved functions are employed: as GP trees and as binary strings. Several numerical experiments involving NFL-style Evolutionary Algorithms for function optimization are performed. The results show the effectiveness of the proposed approach. Several test functions for which Random Search performs better than all other considered algorithms have been evolved.
description: 11 pages
Superconducting atom chips: advantages and challenges
Creators: name: Dikovsky, Valery
name: Sokolovsky, Vladimir
name: Zhang, Bo
name: Henkel, Carsten
name: Folman, Ron
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Superconductors are considered in view of applications to atom chip devices. The main features of magnetic traps based on superconducting wires in the Meissner and mixed states are discussed. The former state may mainly be interesting for improved atom optics, while in the latter, cold atoms may provide a probe of superconductor phenomena. The properties of a magnetic side guide based on a single superconducting strip wire placed in an external magnetic field are calculated analytically and numerically. In the mixed state of type II superconductors, inhomogeneous trapped magnetic flux, relaxation processes and noise caused by vortex motion are posing specific challenges for atom trapping.
description: submitted to Eur. Phys. J. D, latex article class (27 pages, 20 .eps figure files)
‘The Dog and The Tower’ – Feasibility Study Immersive Digital Story
Creators: name: Turpin, Holly
Publisher: name: Loughborough University
Year: 2024

description: A 360 degree narrated video.

A co-created immersive digital story from a feasibility study part of the PhD research 'Understanding Homelessness in Loughborough Through Co-Creative Immersive Digital Storytelling'.
Dry clutch transient dynamics and associated noise vibration and harshness (NVH) mitigation
Creators: name: Minas, Ilias
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 91399 Mechanical Engineering not elsewhere classified
subject: FOS: Mechanical engineering

description: Dry clutch transient dynamics and associated noise vibration and harshness (NVH) mitigation
Combinatorial aspects of boundary loop models
Creators: name: Jacobsen, Jesper Lykke
name: Saleur, Hubert
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We discuss in this paper combinatorial aspects of boundary loop models, that is models of self-avoiding loops on a strip where loops get different weights depending on whether they touch the left, the right, both or no boundary. These models are described algebraically by a generalization of the Temperley-Lieb algebra, dubbed the two-boundary TL algebra. We give results for the dimensions of TL representations and the corresponding degeneracies in the partition functions. We interpret these results in terms of fusion and in the light of the recently uncovered A_n large symmetry present in loop models, paving the way for the analysis of the conformal field theory properties. Finally, we propose conjectures for determinants of Gram matrices in all cases, including the two-boundary one, which has recently been discussed by de Gier and Nichols.
description: v2: Added new figures 6, 9, 12, 13, 17. Further comparison with Ref. [7]
Two-loop SUSY QCD corrections to the chargino masses in the MSSM
Creators: name: Schofbeck, R.
name: Eberl, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have calculated the two-loop strong interaction corrections to the chargino pole masses in the DRbar'-scheme in the Minimal Supersymmetric Standard Model (MSSM) with complex parameters. We have performed a detailed numerical analysis for a particular point in the parameter space and found corrections of a few tenths of a percent. We provide a computer program which calculates chargino and neutralino masses with complex parameters including the one-loop corrections and all two-loop SQCD effects.
description: 12 pages, 11 figures, references modified, clarifications added
The Effect of Composition on Nova Ignitions
Creators: name: Shen, Ken J.
name: Bildsten, Lars
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The accretion of hydrogen-rich matter onto C/O and O/Ne white dwarfs in binary systems leads to unstable thermonuclear ignition of the accreted envelope, triggering a convective thermonuclear runaway and a subsequent classical, recurrent, or symbiotic nova. Prompted by uncertainties in the composition at the base of the accreted envelope at the onset of convection, as well as the range of abundances detected in nova ejecta, we examine the effects of varying the composition of the accreted material. For high accretion rates and carbon mass fractions < 0.002, we find that carbon, which is usually assumed to trigger the runaway via proton captures, is instead depleted and converted to 14N. Additionally, we quantify the importance of 3He, finding that convection is triggered by 3He+3He reactions for 3He mass fractions > 0.002. These different triggering mechanisms, which occur for critical abundances relevant to many nova systems, alter the amount of mass that is accreted prior to a nova, causing the nova rate to depend on accreted composition. Upcoming deep optical surveys such as Pan-STARRS-1, Pan-STARRS-4, and the Large Synoptic Survey Telescope may allow us to detect the dependence of nova rates on accreted composition. Furthermore, the burning and depletion of 3He with a mass fraction of 0.001, which is lower than necessary for triggering convection, still has an observable effect, resulting in a pre-outburst brightening in disk quiescence to > Lsun and an increase in effective temperature to 6.5e4 K for a 1.0 Msun white dwarf accreting at 1e-8 Msun/yr.
description: Submitted to The Astrophysical Journal, 11 pages, 11 figures
The night-sky at the Calar Alto Observatory
Creators: name: Sanchez, S. F.
name: Aceituno, J.
name: Thiele, U.
name: Perez-Ramirez, D.
name: Alves, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a characterization of the main properties of the night-sky at the Calar Alto observatory for the time period between 2004 and 2007. We use optical spectrophotometric data, photometric calibrated images taken in moonless observing periods, together with the observing conditions regularly monitored at the observatory, such as atmospheric extinction and seeing. We derive, for the first time, the typical moonless night-sky optical spectrum for the observatory. The spectrum shows a strong contamination by different pollution lines, in particular from Mercury lines, which contribution to the sky-brightness in the different bands is of the order of ~0.09 mag, ~0.16 mag and ~0.10 mag in B, V and R respectively. The zenith-corrected values of the moonless night-sky surface brightness are 22.39, 22.86, 22.01, 21.36 and 19.25 mag arcsec^-2 in U, B, V, R and I, which indicates that Calar Alto is a particularly dark site for optical observations up to the I-band. The fraction of astronomical useful nights at the observatory is ~70%, with a ~30% of photometric nights. The typical extinction at the observatory is k_V~0.15 mag in the Winter season, with little dispersion. In summer the extinction has a wider range of values, although it does not reach the extreme peaks observed at other sites. The median seeing for the last two years (2005-6) was ~0.90", being smaller in the Summer (~0.87") than in the Winter (~0.96"). We conclude in general that after 26 years of operations Calar Alto is still a good astronomical site, being a natural candidate for future large aperture optical telescopes.
description: 16 pages, 5 figures, accepted for publishing in the Publications of Astronomical Society of the Pacific (PASP)
Localized States at Zigzag Edges of Multilayer Graphene and Graphite Steps
Creators: name: Castro, Eduardo V.
name: Peres, N. M. R.
name: Santos, J. M. B. Lopes dos
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the existence of zero energy surface states localized at zigzag edges of $N$-layer graphene. Working within the tight-binding approximation, and using the simplest nearest-neighbor model, we derive the analytic solution for the wavefunctions of these peculiar surface states. It is shown that zero energy edge states in multilayer graphene can be divided into three families: (i) states living only on a single plane, equivalent to surface states in monolayer graphene; (ii) states with finite amplitude over the two last, or the two first layers of the stack, equivalent to surface states in bilayer graphene; (iii) states with finite amplitude over three consecutive layers. Multilayer graphene edge states are shown to be robust to the inclusion of the next nearest-neighbor interlayer hopping. We generalize the edge state solution to the case of graphite steps with zigzag edges, and show that edge states measured through scanning tunneling microscopy and spectroscopy of graphite steps belong to family (i) or (ii) mentioned above, depending on the way the top layer is cut.
description: 6 pages, 4 figures
D-dualized D-brane
Creators: name: Nakayama, Yu
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We further investigate the dimensional duality (D-duality) proposed in arXiv:0705.0550 by mainly focusing on the properties of D-branes in this background. We derive the world-sheet correspondence of static D-branes, and discuss the fate of non-static D-branes from the world-sheet viewpoint. The quantum string production with or without D-branes is also studied from the time-like Liouville theory. We find that the closed string production from the background is much larger than that from D-branes decaying into nothing.
description: 17 pages, v2: references and comments added, v3: references added
Fermions with attractive interactions on optical lattices and implications for correlated systems
Creators: name: Chien, Chih-Chun
name: Chen, Qijin
name: Levin, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In this paper we address the behavior of the superfluid transition temperature $T_c$ in the attractive Hubbard model. We study systematically the effects of pairing fluctuations and address all filling fractions over the entire range of attractive interaction strength. While the attractive Hubbard model can be regarded as the generalization of BCS to Bose Einstein condensation (BEC) crossover to a lattice, we find that the BEC limit of this Hubbard model is very different from that of jellium, owing to the strong inter-site repulsion between pairs, which becomes important near half filling when the on-site attraction is strong. A central conclusion of our work is that in a lattice, around half filling, the smooth evolution from the BCS to the BEC limits is interrupted. For the attractive Hubbard model, $T_c$ vanishes when the system approaches the bosonic regime with increasing interaction strength. We suggest that the vanishing of $T_c$ at strong coupling strength may signal a quantum critical transition to another form of superfluid not continuously connected to a BCS-like phase. We present a simple variational ansatz for the ground state in this more strongly coupled superfluid. We further generalize the (s-wave) Hubbard model to d-wave pairing and address issues of potential relevance to high temperature superconductors. For the d-wave case, we present a phase diagram and show that here too, one observes a vanishing of $T_c$ when the pairing onset temperature $T^*$ becomes sufficiently large. We suggest that future experiments on ultracold fermions in optical lattices should not be exclusively limited to the repulsive Hubbard model, but should address the attractive model in order to elucidate features of high temperature superconductivity.
description: 10 pages, 5 figures
The Application of Active Query K-Means in Text Classification
Creators: name: Jiang, Yukun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Active learning is a state-of-art machine learning approach to deal with an abundance of unlabeled data. In the field of Natural Language Processing, typically it is costly and time-consuming to have all the data annotated. This inefficiency inspires out our application of active learning in text classification. Traditional unsupervised k-means clustering is first modified into a semi-supervised version in this research. Then, a novel attempt is applied to further extend the algorithm into active learning scenario with Penalized Min-Max-selection, so as to make limited queries that yield more stable initial centroids. This method utilizes both the interactive query results from users and the underlying distance representation. After tested on a Chinese news dataset, it shows a consistent increase in accuracy while lowering the cost in training.
description: 6 pages, 3 algorithms, 4 tables, 8 figures For source code and questions, please email Yukun Jiang at jy2363@nyu.edu Reply would follow shortly
Design and experimental characterization of antennas and wireless systems for innovative wearable and implantable 
ultra low–power applications
Creators: name: Aldrigo, Martino <1978>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: ING-INF/02 Campi elettromagnetici

description: The present PhD thesis exploits the design skills I have been improving since my master thesis’ research. A brief description of the chapters’ content follows.

Chapter 1: the simulation of a complete front–end is a very complex problem and, in particular, is the basis upon which the prediction of the overall performance of the system is possible. By means of a commercial EM simulation tool and a rigorous nonlinear/EM circuit co–simulation based on the Reciprocity Theorem, the above–mentioned prediction can be achieved and exploited for wireless links characterization. This will represent the theoretical basics of the entire present thesis and will be supported by two RF applications.

Chapter 2: an extensive dissertation about Magneto–Dielectric (MD) materials will be presented, together with their peculiar characteristics as substrates for antenna miniaturization purposes. A designed and tested device for RF on–body applications will be described in detail. Finally, future research will be discussed.

Chapter 3: this chapter will deal with the issue regarding the exploitation of renewable energy sources for low–energy consumption devices. Hence the problem related to the so–called energy harvesting will be tackled and a first attempt to deploy THz solar energy in an innovative way will be presented and discussed. Future research will be proposed as well.

Chapter 4: graphene is a very promising material for devices to be exploited in the RF and THz frequency range for a wide range of engineering applications, including those ones marked as the main research goal of the present thesis. This chapter will present the results obtained during my research period at the National Institute for Research and Development in Microtechnologies (IMT) in Bucharest, Romania. It will concern the design and manufacturing of antennas and diodes made in graphene–based technology for detection/rectification purposes.
Temperature Variation Aware Energy Optimization in  Heterogeneous MPSoCs
Creators: name: Sadri, Mohammadsadegh <1980>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: ING-INF/01 Elettronica

description: Thermal effects are rapidly gaining importance in nanometer heterogeneous integrated systems. Increased power density, coupled with spatio-temporal variability of chip workload, cause lateral and vertical temperature non-uniformities (variations) in the chip structure. The assumption of an uniform temperature for a large circuit leads to inaccurate determination of key design parameters. To improve design quality, we need precise estimation of temperature at detailed spatial resolution which is very computationally intensive. Consequently, thermal analysis of the designs needs to be done at multiple levels of granularity.

To further investigate the flow of chip/package thermal analysis we exploit the Intel Single Chip Cloud Computer (SCC) and propose a methodology for calibration of SCC on-die temperature sensors. We also develop an infrastructure for online monitoring of SCC temperature sensor readings and SCC power  consumption.

Having the thermal simulation tool in hand, we propose MiMAPT, an approach for analyzing delay, power and temperature in digital integrated circuits. MiMAPT  integrates seamlessly into industrial Front-end and Back-end chip design flows. It accounts for temperature non-uniformities and self-heating while performing  analysis. 

Furthermore, we extend the temperature variation aware analysis of designs to 3D MPSoCs with Wide-I/O DRAM. We improve the DRAM refresh power by considering  the lateral and vertical temperature variations in the 3D structure and adapting the per-DRAM-bank refresh period accordingly. We develop an advanced virtual  platform which models the performance, power, and thermal behavior of a 3D-integrated MPSoC with Wide-I/O DRAMs in detail. 

Moving towards real-world multi-core heterogeneous SoC designs, a reconfigurable heterogeneous platform (ZYNQ) is exploited to further study the performance  and energy efficiency of various CPU-accelerator data sharing methods in heterogeneous hardware architectures. A complete hardware accelerator featuring  clusters of OpenRISC CPUs, with dynamic address remapping capability is built and verified on a real hardware.
Optimizing Build Orientation for Support Removal using Multi-Axis Machining
Creators: name: Mirzendehdel, Amir M.
name: Behandish, Morad
name: Nelaturi, Saigopal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Computational Geometry (cs.CG)
subject: FOS: Computer and information sciences

description: Parts fabricated by additive manufacturing (AM) are often fabricated first as a near-net shape, a combination of intended nominal geometry and sacrificial support structures, which need to be removed in a subsequent post-processing stage using subtractive manufacturing (SM). In this paper, we present a framework for optimizing the build orientation with respect to removability of support structures. In particular, given a general multi-axis machining setup and sampled build orientations, we define a Pareto-optimality criterion based on the total support volume and the "secluded" support volume defined as the support volume that is not accessible by a given set of machining tools. Since total support volume mainly depends on the build orientation and the secluded volume is dictated by the machining setup, in many cases the two objectives are competing and their trade-off needs to be taken into account. The accessibility analysis relies on the inaccessibility measure field (IMF), which is a continuous field in the Euclidean space that quantifies the inaccessibility of each point given a collection of tools and fixturing devices. The value of IMF at each point indicates the minimum possible volumetric collision between objects in relative motion including the part, fixtures, and the tools, over all possible tool orientations and sharp points on the tool. We also propose an automated support removal planning algorithm based on IMF, where a sequence of actions are provided in terms of the fixturing devices, cutting tools, and tool orientation at each step. In our approach, each step is chosen based on the maximal removable volume to iteratively remove accessible supports. The effectiveness of the proposed approach is demonstrated through benchmark examples in 2D and realistic examples in 3D.
description: Special issue on Computational Fabrication
Global well-posedness of $z$-weak solutions to the primitive equations without vertical diffusivity
Creators: name: Li, Jinkai
name: Yuan, Guozhi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In this paper, we consider the initial boundary value problem in a cylindrical domain to the three dimensional primitive equations with full eddy viscosity in the momentum equations but with only horizontal eddy diffusivity in the temperature equation. Global well-posedness of $z$-weak solution is established for any such initial datum that itself and its vertical derivative belong to $L^2$. This not only extends the results in \cite{Cao5} from the spatially periodic case to general cylindrical domains but also weakens the regularity assumptions on the initial data which are required to be $H^2$ there.
Status of Ground-based and Galactic Gamma-ray Astronomy
Creators: name: Mitchell, A. M. W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: This conference proceedings is a write-up of the Gamma-ray Indirect rapporteur talk given at the 37th International Cosmic Ray Conference (ICRC 2021). In contrast to previous ICRCs, this years edition was held in a fully virtual format, with dedicated discussion sessions organised around specific scientific themes. Many of these topics span the two categories of Gamma-ray Indirect (GAI) and Gamma-ray Direct (GAD), observations of gamma-rays by ground-based and space-based facilities respectively. To cover this organisation by topic in a coherent manner, this GAI rapporteur contribution focuses predominantly (but not exclusively) on Galactic gamma-ray astronomy, whereas the GAD rapporteur contribution focuses predominantly (but not exclusively) on Extra-galactic gamma-ray astronomy. In recent years, the field has seen enormous progress in both theory and observation, particularly in identifying PeVatrons (accelerators of Cosmic Rays to PeV energies), studies of particle escape from the accelerator, and detection of gamma-ray transients, especially gamma-ray bursts.
description: 24 pages, 12 figures, 4 tables, ICRC2021
A Huge Filamentary Structure at z=0.55 and Star Formation Histories of Galaxies at z<1
Creators: name: Tanaka, Masayuki
name: Hoshi, Takako
name: Kodama, Tadayuki
name: Kashikawa, Nobunari
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report a definitive confirmation of a large-scale structure around the super rich cluster CL0016+1609 at z=0.55. We made spectroscopic follow-up observations with FOCAS on Subaru along the large filamentary structure identified in our previous photometric studies. We have confirmed the physical connection of the huge filament extending over 20 Mpc in the N-S direction, and another filament extending from the main cluster to the East. Based on a simple energy argument, we show that it is likely that most of the clumps are bound to the main CL0016 cluster. This structure is surely one of the most prominent confirmed structures ever identified in the distant Universe, which then serves as an ideal laboratory to examine the environmental variation of galaxy properties. We draw star formation histories of galaxies from the composite spectra of red galaxies in field, group, and cluster environments. Combining the results from our previous studies, we find that red galaxies in groups at z~0.8 and red field galaxies at z~0.5 show strong Hd absorption lines for their D4000 indices. These are the environments in which we observed the on-going build-up of the colour-magnitude relation in our previous photometric analyses. The strong Hd absorption lines imply that their star formation is truncated on a relatively short time scale. We suggest that a galaxy-galaxy interaction is the most likely physical driver of the truncation of star formation and thus responsible for the build-up of the colour-magnitude relation since z~1. (Abridged)
description: 13 pages, 5 figures, accepted for publication in MNRAS
L'IMPLICATION DES SALARIES ET LES FACTEURS ORGANISATIONNELS : UNE ETUDE EMPIRIQUE DANS LE SECTEUR PARAPUBLIC MALIEN CAS : HOPITAL MERE ENFANT LUXEMBOURG
Creators: name: Boubacar SANOGO
name: Amara NIMAGA
name: Abdoulaye KEITA
Publisher: name: Zenodo
Year: 2025

description: Les comportements organisationnels des ressources humaines jouent un rôle primordial dans la rentabilité et la réussite de l’organisation, notamment dans la recherche de la performance. Ceci justifie l’attention particulière accordée aux hommes en tant que capitaux irréfutables pour l’entreprise, et dont la considération devrait couvrir à la fois les aspects quantitatif et qualitatif. Quels sont les facteurs liés à l’organisation qui poussent un individu à se dévouer à elle ? L’étude est menée dans le secteur parapublic dans lequel les salariés sont assujettis directement aux contrôles permanents et pointus des dirigeants, et dont la carrière des salariés dépend partiellement de leurs attitudes et comportements vis-à-vis du travail et de l’organisation. Cette étude démontre que l’implication du salarié résulte de différents facteurs organisationnels tels que le soutien offert par l’entreprise (H1), la performance de l’entreprise (H2), le parcours effectué par l’entreprise (H3), les liens du salarié avec l’entreprise (H4). L’objectif global est de démontrer l’existence des relations directes entre les différents facteurs organisationnels et l’implication du salarié.  Après avoir fourni un recueil des différents facteurs pouvant apporter une influence notable sur l’implication organisationnelle des salariés, cette étude révélera en conséquence la multi-dimensionnalité de l’implication. Elle servira subséquemment pour la vérification dans le cas malien de la pertinence des différents facteurs de l’implication étudiés dans des contextes différents, et permettra la proposition d’un modèle d’études qui sera validé par une expérimentation sur terrain par le biais d’un échantillon composé de 185 salariés du secteur parapublic malien. Elle a adopté la méthode de la régression linéaire multiple et l’analyse de la variance (ANOVA) conduite sous JASP afin de tester les hypothèses. Les résultats issus de cette étude constitueront des bases en matière de management des ressources humaines notamment des aspects comportementaux.
A Morphological and Statistical Analysis of Ansae in Barred Galaxies
Creators: name: Martinez-Valpuesta, I.
name: Knapen, J. H.
name: Buta, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Many barred galaxies show a set of symmetric enhancements at the ends of the stellar bar, called {\it ansae}, or the ``handles'' of the bar. The ansa bars have been in the literature for some decades, but their origin has still not been specifically addressed, although, they could be related to the growth process of bars. But even though ansae have been known for a long time, no statistical analysis of their relative frequency of occurrence has been performed yet. Similarly, there has been no study of the varieties in morphology of ansae even though significant morphological variations are known to characterise the features. In this paper, we make a quantitative analysis of the occurrence of ansae in barred galaxies, making use of {\it The de Vaucouleurs Atlas of Galaxies} by Buta and coworkers. We find that $\sim 40%$ of SB0's show ansae in their bars, thus confirming that ansae are common features in barred lenticulars. The ansa frequency decreases dramatically with later types, and hardly any ansae are found in galaxies of type Sb or later. The bars in galaxies with ansae are stronger in the median than those in galaxies without ansae, but the presence of inner and outer rings is not related to the presence of ansae. Implications of these results and theories for the possible origin of ansae are discussed briefly.
description: 14 pages, 6 figures, 2 tables, accepted for publication in AJ
Measurements of the Casimir-Lifshitz force in fluids: the effect of electrostatic forces and Debye screening
Creators: name: Munday, J. N.
name: Capasso, Federico
name: Parsegian, V. Adrian
name: Bezrukov, Sergey M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work, we present detailed measurements of the Casimir-Lifshitz force between two gold surfaces (a sphere and a plate) immersed in ethanol and study the effect of residual electrostatic forces, which are dominated by static fields within the apparatus and can be reduced with proper shielding. Electrostatic forces are further reduced by Debye screening through the addition of salt ions to the liquid. Additionally, the salt leads to a reduction of the Casimir-Lifshitz force by screening the zero-frequency contribution to the force; however, the effect is small between gold surfaces at the measured separations and within experimental error. An improved calibration procedure is described and compared to previous methods. Finally, the experimental results are compared to Lifshitz's theory and found to be consistent for the materials used in the experiment.
description: 11 figures. PRA in press
Future-making and frictional mobility in the return of Burmese migrants
Creators: name: Rangkla, Prasert
Publisher: name: Austrian Journal of South-East Asian Studies
Year: 2019

description: This article explores the experiences of recent returnees from Thailand to Southeast Myanmar and the complicated landscape of their future-making. In looking at the arduous journeys of Burmese migrants both in Myanmar and Thailand, I discuss how economic and political developments in reform-era Myanmar have informed Burmese migrants’ idea of return migration. Seeking a better life through coming home, they have encountered factors of friction and traction that either support or impede their plans. Accordingly, I argue that the return of these Burmese workers has become frictional mobility rather than a straightforward return. Ethnic politics and land boom in the region have intensified social inequality and conflicts that eventually make the organization of return more complex. The situation allows migrants to settle in their home country, postpone the return, and continue shuttling at the border while using the pattern of movement as a livelihood.
description: Austrian Journal of South-East Asian Studies, Vol 12 No 1 (2019)
Space Velocities of L- and T-type Dwarfs
Creators: name: Osorio, M. R. Zapatero
name: Martin, E. L.
name: Bejar, V. J. S.
name: Bouy, H.
name: Deshpande, R.
name: Wainscoat, R. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (Abridged) We have obtained radial velocities of a sample of 18 ultracool dwarfs (M6.5-T8) using high-resolution, near-infrared spectra obtained with NIRSPEC and the Keck II telescope. We have confirmed that the radial velocity of Gl 570 D is coincident with that of the K-type primary star Gl 570 A, thus providing additional support for their true companionship. The presence of planetary-mass companions around 2MASS J05591914-1404488 (T4.5V) has been analyzed using five NIRSPEC radial velocity measurements obtained over a period of 4.37 yr. We have computed UVW space motions for a total of 21 L and T dwarfs within 20 pc of the Sun. This population shows UVW velocities that nicely overlap the typical kinematics of solar to M-type stars within the same spatial volume. However, the mean Galactic (44.2 km/s) and tangential (36.5 km/s) velocities of the L and T dwarfs appear to be smaller than those of G to M stars. A significant fraction (~40%) of the L and T dwarfs lies near the Hyades moving group (0.4-2 Gyr), which contrasts with the 10-12% found for earlier-type stellar neighbors. Additionally, the distributions of all three UVW components (sigma_{UVW} = 30.2, 16.5, 15.8 km/s) and the distributions of the total Galactic (sigma_{v_tot} = 19.1 km/s) and tangential (sigma_{v_t} = 17.6 km/s) velocities derived for the L and T dwarf sample are narrower than those measured for nearby G, K, and M-type stars, but similar to the dispersions obtained for F stars. This suggests that, in the solar neighborhood, the L- and T-type ultracool dwarfs in our sample (including brown dwarfs) is kinematically younger than solar-type to early M stars with likely ages in the interval 0.5-4 Gyr.
description: Accepted for publication in ApJ
СОВЕРШЕНСТВОВАНИЕ МЕТАКОГНИТИВНЫХ ДЕЙСТВИЙ У МЛАДШИХ ШКОЛЬНИКОВ
Creators: name: Зак Анатолий Залманович
Publisher: name: StudNet
Year: 2021
Subjects: метакогнитивные действия
начальная школа
дети 9 лет
сюжетно-логические задачи
пространственно-комбинаторные задачи

description: В представленном исследовании изучались метакогнитивные действия, связанные с решением задач. Цель экспериментальной работы состояла в определении условий совершенствования отмеченных метакогнитивных действий у детей 9 лет. В качестве такое условия апробировалось содержание занятий на материале сюжетно-логических и пространственно-комбинаторных задач, включенных в авторскую программу «Мета – 1». Проведенные по этом программе групповые эксперименты показали, что регулярные занятия на материале отмеченных задач существенно способствуют совершенствованию у детей метакогнитивных действий, связанных с решением задач.
Solar observation with the Fourier transform spectrometer I : Preliminary results of the visible and near-infrared solar spectrum
Creators: name: Bai, Xianyong
name: Zhang, Zhiyong
name: Feng, Zhiwei
name: Deng, Yuanyong
name: Bao, Xingming
name: Yang, Xiao
name: Song, Yongliang
name: Tong, Liyue
name: Jing, Shuai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Fourier transform spectrometer (FTS) is a core instrument for solar observation with high spectral resolution, especially in the infrared. The Infrared System for the Accurate Measurement of Solar Magnetic Field (AIMS), working at 10-13 $μm$, will use a FTS to observe the solar spectrum. The Bruker IFS-125HR, which meets the spectral resolution requirement of AIMS but just equips with a point source detector, is employed to carry out preliminary experiment for AIMS. A sun-light feeding experimental system is further developed. Several experiments are taken with them during 2018 and 2019 to observe the solar spectrum in the visible and near infrared wavelength, respectively. We also proposed an inversion method to retrieve the solar spectrum from the observed interferogram and compared it with the standard solar spectrum atlas. Although there is a wavelength limitation due to the present sun-light feeding system, the results in the wavelength band from 0.45-1.0 $μm$ and 1.0-2.2 $μm$ show a good consistence with the solar spectrum atlas, indicating the validity of our observing configuration, the data analysis method and the potential to work in longer wavelength. The work provided valuable experience for the AIMS not only for the operation of a FTS but also for the development of its scientific data processing software.
description: 15 pages,10 figures, 1 table ,accepted by Research in Astronomy and Astrophysics
Additional file 1: of An outcome-based definition of low birthweight for births in low- and middle-income countries: a secondary analysis of the WHO global survey on maternal and perinatal health
Creators: name: Malinee Laopaiboon
name: Pisake Lumbiganon
name: Siwanon Rattanakanokchai
name: Warut Chaiwong
name: Souza, João
name: Vogel, Joshua
name: Rintaro Mori
name: Gülmezoglu, Ahmet
Publisher: name: Figshare
Year: 2019
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Developmental Biology
subject: Cancer

description: The percentage of early neonatal mortality by 100 g interval of birthweights. The rates of ENM among 100 g intervals of these birthweights are quite similar of around 0.5% in our analysed database. (PDF 185 kb)