cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Cosmology of the Symmetrical Relativity versus Spontaneous Creation of the Universe Ex Nihilo
Creators: name: Cruz, Cláudio Nassif
name: da Silva, Fernando Antônio
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The cosmology of "Spontaneous Creation of the Universe Ex Nihilo" and the cosmology of the Symmetrical Relativity offer proposals to explain the creation and evolution of the universe. In essence they are still very distinct. However, we will argue that there was an antecedent to the big bang. Thus, we will penetrate a trans-Planckian regime, where we find an effective Planck length $L_P^{\prime}\rightarrow 0$. This will lead to more fundamental physical reflections about {\it nothing} in the cosmology of spontaneous creation. From the point of view of spontaneous creation, the step backwards went back to another principle, based on the {\it information}, which led to the big bang. While the spontaneous creation refers to the virtual pre-existence of {\it information}, which would have emerged randomly from {\it nothing}, the cosmology of Symmetrical Relativity does not stop there: we go back to one's own origin by projecting it before the creation of one's own time. From the present perspective, {\it nothing} is a primordial vacuum, whose {\it information} has made the universe by condensing and igniting. It was not randomly created, since the entropy had to vary from infinite (chaos) to zero (big bang) by violating the 2nd.law of thermodynamics in a trans-Planckian regime. {\it Nothing} or chaos with infinite entropy precedes the big bang (null entropy) within a trans-Planckian scenario and it determines the whole plot until the total extinction of the universe. We will show that {\it information}, besides not being born of the universe, also does not develop from it like the computational idea of Artificial Intelligence (AI). Thus, the universe is not simply self-taught as defended by the spontaneous creation. This could shed light on the problem of Penrose's Weyl curvature hypothesis, which considers a null Weyl curvature due to a null entropy in the big bang.
description: 15 pages, 8 figures
Application of the "Among" Leadership Model to Improve Teacher Work Discipline
Creators: name: Rusman
name: Sunarti
name: Rahadian, Raditya Bayu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: This study aims to improve teacher work discipline related to their duties as classroom teachers. This research is a school action research conducted for four months starting in October 2018 to January 2019 at SDN 11 Simpang Rimba, South Bangka, Indonesia in the 2018/2019 academic year. The data collection instrument used observation sheets and documentation. Data analysis used quantitative data analysis techniques with descriptive statistics. The results of this study indicate that the application of the "Among" leadership model can improve teacher work discipline in the aspects of arriving on time, work hours fulfillment, and prepare lesson plans.
description: 6 pages
Phase Composition of AlTiNbMoV, AlTiNbTaZr and AlTiNbMoCr Refractory Complex Concentrated Alloys: A Correlation of Predictions and Experiment
Creators: name: Kozlík, Jiří
name: Lukáč, František
name: Luna, Mariano Casas
name: Šalata, Kristián
name: Stráský, Josef
name: Veselý, Jozef
name: Jača, Eliška
name: Chráska, Tomáš
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Designing complex concentrated alloys (CCA), also known as high entropy alloys (HEA), requires reliable and accessible thermodynamic predictions due to vast space of possible compositions. Numerous semiempirical parameters have been developed for phase predictions over the years. However, in this paper we show that none of these parameters is a robust indicator of phase content in various refractory CCA. CALPHAD proved to be a more powerful tool for phase predictions, however, the predictions face several limitations. AlTiNbMoV, AlTiNbTaZr and AlTiNbMoCr alloys were prepared using blended elemental powder metallurgy. Their phase and chemical composition were investigated by the means of scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction. Apart from the minor contamination phases (Al2O3 and Ti(C,N,O)), AlTiNbMoV and AlTiNbMoCr exhibited single-phase solid solution microstructure at the homogenization temperature of 1400 °C, while Al3Zr5 based intermetallics were present in the AlTiNbTaZr alloy. None of the simple semiempirical parameter was able to predict phase content correctly in all three alloys. Predictions by CALPHAD (TCHEA4 database) were able to predict the phases with limited accuracy only. Critical limitation of the TCHEA4 database is that only binary and ternary phase diagrams are assessed and some more complex phases cannot be predicted.
description: 17 pages, 15 figures, 32 references. Postprint version published in Metallurgical and Materials Transactions A (2024)
MULTI-OBJECTIVE OPTIMIZATION FOR ENERGY-EFFICIENT AND COST-EFFECTIVE HOSPITALS
Creators: name: De Stasio, Claudio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2015

description: The building sector represents around 32% of total final energy demand and 40% of primary energy consumption at European level and is thus very energy-intensive. In this context, the Directive 2010/31/EU "Energy Performance of Buildings" (EPBD recast) establishes a comparative methodology framework for the assessment of buildings' energy performance "with a view to achieving cost-optimal levels". The cost optimal analysis leads to a package of energy efficiency measures that minimizes the global cost over a building's lifecycle. Since it is not possible to apply such analysis to each building, a set of reference buildings (RBs) must be defined to represent the national building stock, as previously done but with different targets.
It is important to highlight that hospitals are the most energy-intensive type of building, since they require big amounts of energy for air-conditioning in order to maintain an high air quality level also for the working of equipments and diagnostic tools. To reduce hospitals' energy consumptions while satisfying quality standards, new tools are required.
Therefore, referring to the legislative framework in force, this PhD thesis illustrates an original methodology to define a hospital reference building (both for new or existing hospitals) and to evaluate, using a multi-objective approach, the optimal energy performance levels related to different refurbishment scenarios.
Referring to a fixed location (Naples, 1034 DD), an original methodology to characterize a hospital reference building is illustrated; in more detail two versions of the reference building were characterized, the first one representative of hospitals built between 1991 and 2005 and the second one representative of new buildings.
The core of this methodology is the development of a virtual building based on statistical data and, exceptionally, on experts' knowledge and other sources of information. The methodology is organized in different phases: definition of the geometry, subdivision into thermal zones, definition of the architectural envelope, development of the geometric model, systems' characterization, dynamic energy simulation. The analysis of energy performance, using Energy plus, was carried out for both RBs and the primary energy consumptions for all uses are characterized.
Referring to different retrofit's scenario  an analysis of elements and technologies for the reduction of the energy demand was carried out,  with an approach first focused on the detailed study of the single design element and then on the global analysis of the efficacy of "energy efficiency packages" (EEMs). In order to evaluate the optimal EEMs a new methodology was developed for cost-optimal analysis by means of the multi-objective optimization of hospitals energy performance.
Finally a dynamic energy analysis of a real hospital case study, representative of the existing stock, was reported in order to compare with the Reference Building' energy performance.
Anomalus BRST Complexes for Non-Critical Massive Strings
Creators: name: Daszkiewicz, Marcin
name: Hasiewicz, Zbigniew
name: Walczyk, Cezary J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is shown that the BRST resolution of the spaces of physical states of non-critical (anomalus) massive string models can be consistently defined. The appropriate anomalus complexes are obtained by canonical restrictions of the ghost extended spaces to the kernel of curvature operator and additional Gupta-Bleuler like conditions without any modifications of the matter sector. The cohomologies of the polarized anomalus complex are calculated and analyzed in details.
description: The errors of the previous version are corrected
Nonadiabatic Atomic-like State Stabilizing Antiferromagnetism and Mott Insulation in MnO
Creators: name: Krüger, Ekkehard
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this paper I report evidence that the antiferromagnetic and insulating ground state of MnO is caused by a nonadiabatic atomic-like motion as it is evidently the case in NiO. In addition, I show that the experimental findings of Goodwin et al. [Phys. Rev. Lett. (2006), 96,~047209] corroborate my suggestion that the rhombohedral-like distortion in antiferromagnetic MnO as well as in antiferromagnetic NiO is an inner distortion of the monoclinic base-centered Bravais lattice of the antiferromagnetic phases.
description: arXiv admin note: text overlap with arXiv:1911.08190
Durable, ultrathin, and antifouling polymer brush coating for efficient condensation heat transfer
Creators: name: Li, Shuai
name: Lam, Cheuk Wing Edmond
name: Donati, Matteo
name: Regulagadda, Kartik
name: Yavuz, Emre
name: Pfeiffer, Till
name: Sarkiris, Panagiotis
name: Gogolides, Evangelos
name: Milionis, Athanasios
name: Poulikakos, Dimos
name: Butt, Hans-Jürgen
name: Kappl, Michael
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Heat exchangers are made of metals because of their high heat conductivity and mechanical stability. Metal surfaces are inherently hydrophilic, leading to inefficient filmwise condensation. It is still a challenge to coat these metal surfaces with a durable, robust and thin hydrophobic layer, which is required for efficient dropwise condensation. Here, we report the non-structured and ultrathin (~6 nm) polydimethylsiloxane (PDMS) brushes on copper that sustain high-performing dropwise condensation in high supersaturation. Due to the flexible hydrophobic siloxane polymer chains, the coating has low resistance to drop sliding and excellent chemical stability. The PDMS brushes can sustain dropwise condensation for up to ~8 h during exposure to 111 °C saturated steam flowing at 3 m/s, with a 5-7 times higher heat transfer coefficient compared to filmwise condensation. The surface is self-cleaning and can reduce bacterial attachment by 99%. This low-cost, facile, fluorine-free, and scalable method is suitable for a great variety of condensation heat transfer applications.
description: Submitted to ACS Materials and Interfaces
Dynamics of Weyl Scale Invariant non-BPS p=3 Branes
Creators: name: Liu, Lu-Xin
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper a Weyl scale invariant $p=3$ brane scenario is introduced, with the brane embedded in a higher dimensional bulk space with $N=1, 5D$ Super--Weyl symmetry. Its action, which describes its long wave oscillation modes into the ambient superspace and breaks the target symmetry down to the lower dimensional Weyl W(1,3) symmetry, is constructed by the approach of coset method.
description: 12 pages, modified version
Electronic transport in Si nanowires: Role of bulk and surface disorder
Creators: name: Markussen, Troels
name: Rurali, Riccardo
name: Brandbyge, Mads
name: Jauho, Antti-Pekka
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We calculate the resistance and mean free path in long metallic and semiconducting silicon nanowires (SiNWs) using two different numerical approaches: A real space Kubo method and a recursive Green's function method. We compare the two approaches and find that they are complementary: depending on the situation a preferable method can be identified. Several numerical results are presented to illustrate the relative merits of the two methods. Our calculations of relaxed atomic structures and their conductance properties are based on density functional theory without introducing adjustable parameters. Two specific models of disorder are considered: Un-passivated, surface reconstructed SiNWs are perturbed by random on-site (Anderson) disorder whereas defects in hydrogen passivated wires are introduced by randomly removed H atoms. The un-passivated wires are very sensitive to disorder in the surface whereas bulk disorder has almost no influence. For the passivated wires, the scattering by the hydrogen vacancies is strongly energy dependent and for relatively long SiNWs (L>200 nm) the resistance changes from the Ohmic to the localization regime within a 0.1 eV shift of the Fermi energy. This high sensitivity might be used for sensor applications.
description: 9 pages, 7 figures, submitted to Phys. Rev. B
An operadic approach to deformation quantization of compatible Poisson brackets
Creators: name: Dotsenko, Vladimir
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 53D55 (Primary), 18D50 (Secondary)

description: We construct an analogue of the Livernet--Loday operad for two compatible brackets. The Livernet--Loday operad can be used to define $\star$-products and deformation quantization for Poisson structures. We make use of our operad in the same way, introducing a definition of (operadic) deformation quantization of compatible Poisson structures.
description: 11 pages, no figures, typos corrected
Gli scaffali digitali dell'Accademia della Crusca
Creators: name: Marazzini, Claudio
name: Maraschio, Nicoletta
Publisher: name: Griseldaonline
Year: 2021

description: La sezione del sito dell'Accademia della Crusca denominata “Scaffali digitali” si è andata arricchendo nel corso del tempo, fino a diventare una delle risorse linguistiche della Rete più frequentate e più utili per gli studiosi di tutto il mondo. La relazione illustrerà le linee di intervento seguite e darà conto della storia degli “Scaffali digitali”, parallela alla crescita d’importanza delle risorse informatiche applicate al settore umanistico nel quadro culturale italiano. La prima fase degli “Scaffali” ha riproposto le 5 edizioni del Vocabolario dell'Accademia, un'operazione che si va ora concludendo. La relazione metterà quindi in evidenza come, attorno a questo nucleo fondamentale della lessicografia italiana trasferito dalla carta a digitale, si sia costruita una raccolta preziosa di vocabolari e di strumenti, nuovi (ad es. ArchiDATA e la “Stazione lessicografica”) o talora ottenuti attraverso una politica di scambi non onerosi con l'industria editoriale (il Tommaseo-Bellini e il GDLI). La relazione illustrerà le difficoltà incontrate nella trasposizione dalla carta al sito, tenendo conto del fatto che il digitale è un’approssimazione che va migliorando via via, e l’esito sta nell’innovazione continua.
description: Griseldaonline, V. 20 N. 2 (2021): Italianistica digitale
Kar'úk songs
Creators: name: Collins, Henry
name: Halpern, Abraham M.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: yum

description: 2 WAV files. For associated notebooks, see Margaret Langdon Papers (Bancroft Library), carton 11, folders 6-7. Digitization by The Audio Archive (Burlingame, California).
Strong coupling between a metallic nanoparticle and a single molecule
Creators: name: Truegler, Andreas
name: Hohenester, Ulrich
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically investigate strong coupling between a single molecule and a single metallic nanoparticle. A theory suited for the quantum-mechanical description of surface plasmon polaritons (SPPs) is developed. The coupling between these SPPs and a single molecule, and the modified molecular dynamics in presence of the nanoparticle are described within a combined Drude and boundary-element-method approach. Our results show that strong coupling is possible for single molecules and metallic nanoparticles, and can be observed in fluorescence spectroscopy through the splitting of emission peaks.
description: 6 pages, 4 figures
Research on Enhancing C-V2X Communication via Danger-Aware Vehicular Networking
Creators: name: Sadeeq, Lanre
name: Ajao, Qasim
Publisher: name: arXiv
Year: 2024
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents a protocol that optimizes message dissemination in C-V2X technology, crucial for advancing intelligent transportation systems (ITS) aimed at enhancing road safety. As vehicle density and velocity rise, the volume of data requiring communication significantly increases. By considering the risk levels that vehicles encounter and using inter-vehicle proximity as a key indicator of potential hazards, the proposed protocol prioritizes communication, allowing vehicles facing higher risks to transmit their messages first. Our results show that this prioritization effectively reduces the number of concurrent transmissions, leading to improved performance metrics such as packet delivery ratio, throughput, latency, and lower probabilities of channel congestion and collision.
Orbitopal Fixing
Creators: name: Kaibel, Volker
name: Peinhardt, Matthias
name: Pfetsch, Marc E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optimization and Control (math.OC)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 90C10, 90C57, 52B12

description: The topic of this paper are integer programming models in which a subset of 0/1-variables encode a partitioning of a set of objects into disjoint subsets. Such models can be surprisingly hard to solve by branch-and-cut algorithms if the order of the subsets of the partition is irrelevant, since this kind of symmetry unnecessarily blows up the search tree. We present a general tool, called orbitopal fixing, for enhancing the capabilities of branch-and-cut algorithms in solving such symmetric integer programming models. We devise a linear time algorithm that, applied at each node of the search tree, removes redundant parts of the tree produced by the above mentioned symmetry. The method relies on certain polyhedra, called orbitopes, which have been introduced bei Kaibel and Pfetsch (Math. Programm. A, 114 (2008), 1-36). It does, however, not explicitly add inequalities to the model. Instead, it uses certain fixing rules for variables. We demonstrate the computational power of orbitopal fixing at the example of a graph partitioning problem.
description: 22 pages, revised and extended version of a previous version that has appeared under the same title in Proc. IPCO 2007
EXPERIMENTAL AND NUMERICAL ASSESSMENT OF DYNAMIC SOIL-PILE-STRUCTURE INTERACTION
Creators: name: Durante, Maria Giovanna
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2015

description: A reliable approach for studying the seismic soil-pile- structure interaction is the physical modelling of scaled models in 1-g or n-g devices. A comprehensive laboratory test campaign, performed on the 6-degree-of-freedom 1-g shaking table of the Bristol Laboratory for Advanced Dynamics Engineering (BLADE) of the University of Bristol (UK), is illustrated and discussed in the present thesis. The experimental campaign was carried out within the framework of the Seismic Engineering Research Infrastructures for European Synergies (SERIES).
The physical model comprises a group of five piles embedded in a bi-layer deposit with several pile-head configurations and equivalent cantilever systems (single-degree of freedom, SDOF). To investigate the seismic soil-pile-structure interaction, the model was subjected to both dynamic and seismic input motions. The physical model was
densely instrumented with accelerometers, Linear Variable Displacement Transformers(LVDTs), strain-gauges (along piles) and a contactless displacement transducer (Indikon) for the evaluation of the settlements. Typical results of free-filed, pile and system response analyses are discussed hereafter. In order to account for the inhomogeneous shear wave velocity profile in the bi-layer deposit, an analytical close-form solution has also been devoleped and validated using the experimental data.
The outcomes of the experimental campaign were used to calibrate an advanced two-dimensions difference element model, which has been implemented in the computer program FLAC2D. The comparisons between the experimental and numerical results are satisfactory for case studies, i.e. considering different input motions (static, dynamic and seismic) and for a wide range of input accelerations.
Quantized and Asynchronous Federated Learning
Creators: name: Ortega, Tomas
name: Jafarkhani, Hamid
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics
subject: G.1.6; F.2.1; E.4
subject: 68W10, 68W15, 68W40, 90C06, 90C35, 90C26

description: Recent advances in federated learning have shown that asynchronous variants can be faster and more scalable than their synchronous counterparts. However, their design does not include quantization, which is necessary in practice to deal with the communication bottleneck. To bridge this gap, we develop a novel algorithm, Quantized Asynchronous Federated Learning (QAFeL), which introduces a hidden-state quantization scheme to avoid the error propagation caused by direct quantization. QAFeL also includes a buffer to aggregate client updates, ensuring scalability and compatibility with techniques such as secure aggregation. Furthermore, we prove that QAFeL achieves an $\mathcal{O}(1/\sqrt{T})$ ergodic convergence rate for stochastic gradient descent on non-convex objectives, which is the optimal order of complexity, without requiring bounded gradients or uniform client arrivals. We also prove that the cross-term error between staleness and quantization only affects the higher-order error terms. We validate our theoretical findings on standard benchmarks.
Petrarca on-line
Creators: name: Berté, Monica
name: Petoletti, Marco
Publisher: name: Griseldaonline
Year: 2021

description: Petrarca on-line è la prima piattaforma digitale dedicata alla figura e all’opera di Francesco Petrarca, la cui struttura si configura come un sito open access, bilingue (italiano e inglese), di risorse derivanti da indagini ecdotiche, filologiche, codicologico-paleografiche, critico-letterarie, storiche, storico-artistiche dei vari nuclei di ricerca. Gli utenti potranno trovare e interrogare le seguenti sezioni, fra loro incrociabili e articolate in sottosezioni: 1. Opere: il corpus completo di scritti in volgare e in latino di P. in testi criticamente rivisti, codificati, interrogabili ed elenco, descrizione e riproduzione dei manoscritti che tramandano ciascuna opera; 2. Biblioteca: censimento e descrizione di tutti i volumi di opere classiche e medievali consultati da P. e giunti a noi per via diretta o indiretta (postillati autografi o apografi), con bibliografia e riproduzioni di ogni manoscritto; 3. Cronologia: eventi e opere di P. descritti anno per anno, timeline, bibliografia, mappe, rimandi alle altre sezioni, immagini; 4. Risorse: a) bibliografia generale; b) biografie antiche di P. (secc. xiv-xvi), con codifica dei testi e censimento della loro tradizione manoscritta e a stampa; c) iconografia; d) materiali e strumenti, fra cui, per esempio, Pdf di contributi fondamentali per la storia degli studi petrarcheschi; 5. Percorsi: elementi e forme della prima ricezione e della plurisecolare fortuna di P. in Italia e in Europa; 6. Segnalazione dei principali eventi, novità editoriali e link alle risorse di rete connesse con il progetto, che potranno essere trasmesse dagli stessi utenti tramite la creazione di una mailing list.
description: Griseldaonline, V. 20 N. 2 (2021): Italianistica digitale
Comment on "Correlation between Dynamic Heterogeneity and Medium-Range Order in Two-Dimensional Glass-Forming Liquids"
Creators: name: Sausset, François
name: Tarjus, Gilles
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In a recent letter, Kawasaki et al. (PRL 99, 215701 (2007)) study glass formation in a 2-dimensional (2D) model of polydisperse repulsive disks. They give numerical evidence for a direct relation between slowing down of the relaxation, extension of some medium-range order, and development of dynamic heterogeneities. We disagree with the authors' interpretation on two points which we believe to be potentially important for understanding the glass transition.
description: Comment to appear in PRL along with reply by Kawasaki et al
Letter from W. Hilborn to Jim [James Goldie], February 22, [1908]
Creators: name: Hilborn, W.
Publisher: name: The University of British Columbia
Year: 2017

description: Letter from W. Hilborn to Jim (James Goldie), dated February 22, 1908; written on The Canadian Bank of Commerce letterhead. The letter thanks Jim for his kindness and sympathy, and expresses an interest in seeing Jim, if Jim is down east during his visit on April 25th.
Validation of stellar population and kinematical analysis of galaxies
Creators: name: Koleva, M.
name: Bavouzet, N.
name: Chilingarian, I.
name: Prugniel, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: 3D spectroscopy produces hundreds of spectra from which maps of the characteristics of stellar populations (age-metallicity) and internal kinematics of galaxies can be derived. We carried on simulations to assess the reliability of inversion methods and to define the requirements for future observations. We quantify the biases and show that to minimize the errors on the kinematics, age and metallicity (in a given observing time) the size of the spatial elements and the spectral dispersion should be chosen to obtain an instrumental velocity dispersion comparable to the physical dispersion.
description: 5 pages, 3 figures, extended version of a poster proceeding to appear in "Science Perspectives for 3D Spectroscopy", eds. M. Kissler-Patig, M. M. Roth and J. R. Walsh, ESO Astrophysics Symposia. (The two last pages with figures are not in the conference proceedings.)
Structure and properties of polyolefin-based multilayer films for healthcare applications and management of quality control
Creators: name: Tufano, Diego
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2015

description: Different blends of various grades of polyethylene (low density PolyEthylene (LDPE), linear low density PolyEthylene (LLDPE) and medium density PolyEthylene (MDPE), specialty of etherophasic copolymers propylene-ethylene and inorganic additives, as talc and calcium carbonate, were used for the production of multilayered films for healthcare applications. These films were obtained through the blow extrusion process using a pilot plant at company Blu Plast. This study was aimed to the improvement of the characteristic of soft-touch and mechanical performance of films used as back-sheet, whitout resorting surface treatment.
Moreover, the management system of quality control of the company Blu Plast was implemented.
Generic Multicast (Extended Version)
Creators: name: Bolina, José Augusto
name: Sutra, Pierre
name: Rocha, Douglas Antunes
name: Camargos, Lasaro
Publisher: name: arXiv
Year: 2024
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences
subject: C.2.4

description: Communication primitives play a central role in modern computing. They offer a panel of reliability and ordering guarantees for messages, enabling the implementation of complex distributed interactions. In particular, atomic broadcast is a pivotal abstraction for implementing fault-tolerant distributed services. This primitive allows disseminating messages across the system in a total order. There are two group communication primitives closely related to atomic broadcast. Atomic multicast permits targeting a subset of participants, possibly stricter than the whole system. Generic broadcast leverages the semantics of messages to order them only where necessary (that is when they conflict). In this paper, we propose to combine all these primitives into a single, more general one, called generic multicast. We formally specify the guarantees offered by generic multicast and present efficient algorithms. Compared to prior works, our solutions offer appealing properties in terms of time and space complexity. In particular, when a run is conflict-free, that is no two messages conflict, a message is delivered after at most three message delays.
description: 12 pages, 2 figures
Effective phonons in anharmonic lattices: anomalous vs normal heat conduction
Creators: name: Li, Nianbei
name: Tong, Peiqing
name: Li, Baowen
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study heat conduction in one dimensional (1D) anharmonic lattices analytically and numerically by using an effective phonon theory. It is found that every effective phonon mode oscillates quasi-periodically. By weighting the power spectrum of the total heat flux in the Debye formula, we obtain a unified formalism that can explain anomalous heat conduction in momentum conserved lattices without on-site potential and normal heat conduction in lattices with on-site potential. Our results agree very well with numerical ones for existing models such as the Fermi-Pasta-Ulam model, the Frenkel-Kontorova model and the $ϕ^4$ model etc.
description: 7 pages 4 figures
Atomistic simulations of surface reactions in ultra-high-temperature ceramics: O2, H2O and CO adsorption and dissociation on ZrB2 (0001) surfaces
Creators: name: Zhang, Yanhui
name: Sanvito, Stefano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Understanding surface reactivity is crucial in many fields, going from heterogeneous catalysis to materials oxidation and corrosion. In order to decipher the surface reactions of ZrB2 exposed to the harsh environment of aerospace components, the chemical activity of both Zr- and B-surfaces is predicted and compared by using density functional theory and nudged elastic band methods. In particular the adsorption, dissociation and diffusion of O2, CO and H2O are extensively examined through the calculation of surface adsorption energies and reaction pathways. We find the dissociative adsorption of O2 dominating the reactivity of ZrB2 surfaces, while the dissociation of H2O and CO is weakly active on Zr-surfaces, and even less activated on B-terminated ones. Importantly, we discover that the reaction of O2 and H2O can trigger strong surface reconstruction at B-surfaces. Our work thus provides significant insights into the diverse adsorption and reaction mechanisms of ZrB2 surfaces.
Linear stability analysis of Oldroyd-B fluids flow in pipes
Creators: name: Petrucci Orefice, Armandojanni
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2015

description: The flow of non-Newtonian fluids has recently gained considerable importance because of its applications in various branches of science, engineering and technology: particularly in material processing, chemical and nuclear industries, geophysics, and bioengineering. The study of non-Newtonian fluids flow is also of significant interest in oil reservoir engineering.

The inadequacy of the Navier-Stokes equations in describing the dynamics of such complex fluids has led to the formulation of other mathematical models able to predict their behaviour. One of them is the Oldroyd-B fluid model that acquired a particular importance since it can be seen as a conjunction of two special cases: the classical Newtonian fluid and the elastic fluid described by the Upper Convected Maxwell model. Moreover it is able to well describe the dynamics of highly dilute polymer solutions, the so-called Boger's fluids.

The aim of this thesis is to investigate the linear stability of fluids described by the Oldroyd-B constitutive equation in cylindrical geometry from the point of view of modal and non-modal analysis. Note that only in recent years non-modal stability analysis of the flow of such kind of fluids, only in two-dimensional channel configuration, has been worked out since of its complexity that does not allow to apply in a straightforward way the classical non-modal analysis tools.

Detailed parametric analyses of Oldroyd-B fluids in annular pipe have been performed. This flow configuration has been chosen not only for its wider application in industrial process, but also because it represents an intermediate case between the channel and the Hagen-Poiseuille flow by varying the inner radius of the pipe.

This investigation has demonstrated the different behaviour of Oldroyd-B fluid with respect to the classical Newtonian one, and the energy budget analysis of the disturbance energy amplification has allowed to highlight some interesting physical mechanism governing such fluids.
Birds
Creators: name: Menta, A.
name: Halpern, Abraham M.
name: Kelly, Lavina
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: yum

description: 4 WAV files. Handwritten label indicates tapes are copies of ones made by Lavina Kelly. Digitization by The Audio Archive (Burlingame, California).
Shaping Minds, saving Souls: Managing Islamic Education in Indonesia and Malaysia
Creators: name: Tayeb, Azmil
Publisher: name: The Australian National University
Year: 2016
Subjects: Islamic education
Indonesia
Malaysia
Islamic orthodoxy

description: The thesis explores the nature of the Islamic education systems in Indonesia and Malaysia and the different approaches taken by these states in managing these systems. Despite their close geographic and cultural ties, the two countries have dramatically different Islamic education, with that in Indonesia being relatively decentralized and discursively diverse, while that in Malaysia is centralized and discursively restricted. By employing theoretical models provided by the state-in-society and historical institutionalism approaches, I argue that the post-colonial state in Malaysia has been more successful in centralizing its control over Islamic education, and more concerned with promoting a restrictive orthodoxy, compared to the post-colonial state in Indonesia due to three factors: the ideological makeup of the state institutions that oversee Islamic education; patterns of societal Islamization that have propted different responses from the states; and control of resources by the central government that influences center-periphery relations. First, the thesis contends that state institutions that oversee Islamic education in Malaysia are more ideologically aligned and focused than their counterparts in Indonesia, which then allows the state in Malaysia to exert more coherent influence over Islamic education. Second, the wave of Islamic resurgence from the 1970s affected Indonesia and Malaysia differently. Islamization forced the state in Malaysia to engage with the political threat posed by Islamic activists, which resulted in increasing centralization of the Islamic education system by state, with the goal of subduing Islamic opposition and controlling Islamic discourse. There was no similarly grave threat to the legitimacy of the state in Indonesia, removing the impetus to centralize control over Islamization or promote a restrictive orthodoxy. Finally, the state in Malaysia has at its disposal more resources to manage Islamic education, including by absorbing private Islamic schools, compared to the state in Indonesia. Less state subsidies and financial control, however, also means that financially viable private Islamic schools in Indonesia can operate somewhat more independently than their counterparts in Malaysia. In short, this thesis shows that the three aforementioned factors can help a state to minimize influence from the society and exert its dominance, in this case by centralizing control over Islamic education. Specifically, they help us understand the markedly different landscapes of Islamic education in Malaysia and Indonesia.
High-speed ultrasound imaging of bubbly flows and shear waves in soft matter
Creators: name: Rosselló, Juan Manuel
name: Ghasemian, Saber Izak
name: Ohl, Claus-Dieter
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In this methods paper, we explore the capabilities of high-speed ultrasound imaging (USI) to study fast varying and complex multi-phase structures in liquids and soft materials. Specifically, we assess the advantages and the limitations of this imaging technique through three distinct experiments involving rapid dynamics: the fl ow induced by a liquid jet, the dissolution of sub-micron bubbles in water, and the propagation of shear waves in a soft elastic material. The phenomena were simultaneously characterized using optical microscopy and USI with bubbles as contrast agents. In water, we use compounded high-speed USI for tracking a multi-phase flow produced by a jetting bubble diving into a liquid pool at speeds around 20 m/s. These types of jets are produced by focusing a single laser pulse below the liquid surface. Upon breakup, they create a bubbly fl ow that exhibits high reflectivity to the ultrasound signal, enabling the visualization of the subsequent complex turbulent flow. In a second experiment, we demonstrate the potential of USI for recording the stability and diffusive shrinkage of micro- and nanobubbles in water that could not be optically resolved. Puncturing an elastic material with a liquid jet creates shear waves that can be utilized for elastography measurements. We analysed the shape and speed of shear waves produced by different types of jetting bubbles in industrial gelatin. The wave characteristics were simultaneously determined by implementing particle velocimetry in optical and ultrasound measurements. For the latter, we employed a novel method to create homogeneously distributed micro- and nanobubbles in gelatin by illuminating it with a collimated laser beam.
Representation of race and gender: the social construction of "white" and "black" women in early British Columbian historical discourses: 1858-1900
Creators: name: Ellis, Beth-Naomi
Publisher: name: University of British Columbia
Year: 2009

description: In contemporary Canadian society women of all "races" are affected by the socially created, racialized and gendered images produced by a culture dominated by "White" males. These images are legacies of Western European cultural history which has traditionally constructed women and people of colour as the "Other", and such constructions have had the effect of restricting women and people of colour from participating fully in mainstream society. While both "White" and "Black" womens' lives have been specifically shaped by such constructs, most "White" women have failed to recognize that "race" has shaped their lives and placed them in a privileged position compared to women of colour, especially "Black" women. In order for "White" (and "Black") women to fully understand racism and sexism, which are both realities of modern societies, it is important for them to understand their historical origins. Therefore, this thesis, in an attempt to address these issues, examines the historical roots and the development of representations of gender and "race" and their specific connections to "Black" and "White" women. The case study involves a focused evaluation of the creation of racialized female symbolism in the early historical narratives of British Columbia between 1858-1900 when the first "Blacks" arrived in the province. These social constructions were compared to the actual lives of "Black" and "White" women of the time in order to gain a clearer understanding of society. The study showed that representations of "White" and "Black" women were often not consistent with the reality of their lives. Women from both groups were frequently able to restructure and, in many cases, reject such images and create their own social reality. The research, while showing that "White" women were given a more privileged position than "Black" women, also illustrated the many similarities between the lives of women from both groups. Finally, by centering both "Black" and "White" women as the subjects of this study, it was possible to view history through a different lense than the traditional male dominated one.
$C^*$-fermi systems and detailed balance
Creators: name: Crismale, Vitonofrio
name: Duvenhage, Rocco
name: Fidaleo, Francesco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Operator Algebras (math.OA)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 46L06, 46L55, 81R15, 82B10

description: A systematic theory of product and diagonal states is developed for tensor products of $\mathbb Z_2$-graded $*$-algebras, as well as $\mathbb Z_2$-graded $C^*$-algebras. As a preliminary step to achieve this goal, we provide the construction of a {\it fermionic $C^*$-tensor product} of $\mathbb Z_2$-graded $C^*$-algebras. Twisted duals of positive linear maps between von Neumann algebras are then studied, and applied to solve a positivity problem on the infinite Fermi lattice. Lastly, these results are used to define fermionic detailed balance (which includes the definition for the usual tensor product as a particular case) in general $C^*$-systems with gradation of type $\mathbb Z_2$, by viewing such a system as part of a compound system and making use of a diagonal state.
description: 44 pages
Q-groupoids and their cohomology
Creators: name: Mehta, Rajan Amit
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 22A22 (Primary) 58A50, 55N91, 53D17 (Secondary)

description: We approach Mackenzie's LA-groupoids from a supergeometric point of view by introducing Q-groupoids, which are groupoid objects in the category of Q-manifolds. There is a faithful functor from the category of LA-groupoids to the category of Q-groupoids. We associate to every Q-groupoid a double complex that provides a model for the Q-cohomology of the classifying space. As examples, we obtain models for equivariant Q- and orbifold Q-cohomology, and for equivariant Lie algebroid and orbifold Lie algebroid cohomology. We obtain double complexes associated to Poisson groupoids and groupoid-algebroid "matched pairs".
description: v2 is the published version. Significant revision over previous version, particularly in section 5.2
GRID-CONNECTECD DOUBLE-STAGE AC-AC POWER CONVERTER FOR CSP RENEWABLE ENERGY SYSTEMS
Creators: name: Sorrentino, Vincenzo
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2015

description: In the last years the renewable energy sources have known a state of their advanced diffusion considering their advantages compared to the traditional energy sources like fossil fuels. For this reason the combined heat and power (CHP) plant fueled by renewable sources are widely used. 
The purpose of this Ph.D. thesis is the design of a new Grid-connected Double-Stage AC-DC/DC-AC Power Converter (DSACPC) for a Concentrating Solar plant for Combined generation of Heat and Power (CS-CHP), that consists of a thermodynamic sub-system fueled by sunlight and an grid-connected electrical sub-system.
The thermodynamic sub-system converts the high-temperature heat, achieved using mirrors to concentrate the sun rays to a receiver tube crossed by thermal fluid, into mechanical energy by means of a coupled Organic Rankine Cycle (ORC). Such mechanical energy outlet by turbine is input to electrical sub-system that uses it to generate active and reactive instantaneous power on the grid supply.
The main advantages of grid-connected CS-CHP proposed are CO2 emissions operating costs more low and operating costs more content than traditional energy sources, because it use a renewable energy source. However due to some drawbacks like low efficiency of the stream cycle, caused by low operating temperature (400°C for synthetic oil), and high cost of installing (i.e. the Concentrating Solar Plants are much larger than photovoltaic plant), it is necessary maximize efficiency of the electrical sub-system so to maximize the global efficiency of proposed plant. 
Therefore a new Grid-connected Double-Stage AC-DC/DC-AC Power Converter (DSACPC) with Second-Order Super-Twisting Integral Sliding Mode Control for electrical sub-system is proposed, in order to make competitive the grid-connected CS-CHP in small scale application.
The thesis is so structured: in the chapter 1 an overview of CS-CHP systems is given and CSP and thermodynamic sub-systems are described; in the chapter 2 the sliding mode control theory is thoroughly investigated, starting to classical sliding mode control to discrete-time integral sliding mode control and the higher-order sliding mode control; in the chapter 3 the modeling and the design of electrical-subsystem is carried out and the control strategy for DSACPC is presented; the chapter 4 shows the numerical and experimental  results to validate the performance of full proposed system.
Query Lifting: Language-integrated query for heterogeneous nested collections
Creators: name: Ricciotti, Wilmer
name: Cheney, James
Publisher: name: arXiv
Year: 2021
Subjects: subject: Programming Languages (cs.PL)
subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Language-integrated query based on comprehension syntax is a powerful technique for safe database programming, and provides a basis for advanced techniques such as query shredding or query flattening that allow efficient programming with complex nested collections. However, the foundations of these techniques are lacking: although SQL, the most widely-used database query language, supports heterogeneous queries that mix set and multiset semantics, these important capabilities are not supported by known correctness results or implementations that assume homogeneous collections. In this paper we study language-integrated query for a heterogeneous query language $NRC_λ(Set,Bag)$ that combines set and multiset constructs. We show how to normalize and translate queries to SQL, and develop a novel approach to querying heterogeneous nested collections, based on the insight that ``local'' query subexpressions that calculate nested subcollections can be ``lifted'' to the top level analogously to lambda-lifting for local function definitions.
description: Full version of ESOP 2021 conference paper