cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Circumferential Crack Modeling of Thin Cylindrical Shells in Modal Deformation
Creators: name: Alijani, Ali
name: Barrera, Olga
name: Bordas, Stephane P. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: An innovative technique, called conversion, is introduced to model circumferential cracks in thin cylindrical shells. The semi-analytical finite element method is applied to investigate the modal deformation of the cylinder. An element including the crack is divided into three sub-elements with four nodes in which the stiffness matrix is enriched. The crack characteristics are included in the finite element method relations through conversion matrices and a rotational spring corresponding to the crack. Conversion matrices obtained by applying continuity conditions at the crack tip are used to transform displacements of the middle nodes to those of the main nodes. Moreover, another technique, called spring set, is represented based on a set of springs to model the crack as a separated element. Components of the stiffness matrix related to the separated element are incorporated while the geometric boundary conditions at the crack tip are satisfied. The effects of the circumferential mode number, the crack depth and the length of the cylinder on the critical buckling load are investigated. Experimental tests, ABAQUS modeling and results from literature are used to verify and validate the results and derived relations. In addition, the crack effect on the natural frequency is examined using the vibration analysis based on the conversion technique.
description: 23 pages, 12 figures, and 5 tables
Inter comparison of the magneto transport of La2/3Ca1/3MnO3: Ag/In polycrystalline composites
Creators: name: Tripathi, Rahul
name: Awana, V. P. S.
name: Balamurugan, S.
name: Kotnala, R. K.
name: RamKishore
name: Kishan, H.
name: Takayama-Muromachi, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this article, we report the synthesis, magneto transport features, and magnetization of polycrystalline La2/3Ca1/3MnO3:Agx/Inx composites with x = 0, 0.1, 0.2, 0.3 and 0.4. In case of Ag the temperature coefficient of resistance (TCR) near ferromagnetic (FM) transition enhances significantly with addition of Ag. The FM transition temperature (TFM) is also increased slightly with Ag doping. Magneto-transport measurements revealed that magneto-resistance (MR) is found to be maximum near TFM. Very sharp TCR is seen near TFM with highest value of up to 15 % for Ag (0.4) sample, which is an order of magnitude higher than as for pristine sample and is the best value yet reported for any polycrystalline LCMO compound. Increased TCR, TFM and significant above room temperature MR of La2/3Ca1/3MnO3:Agx composites is explained on the basis of improved grains size. Interestingly the La2/3Ca1/3MnO3:Inx composites behaved exactly in opposite way resulting in decreased TFM, and TCR compared to pristine LCMO compound. In fact the grains morphology of LCMO:Inx composites is seen inferior to pristine LCMO which is opposite to the LCMO:Agx case.
description: 13 pages of TEXT+Figs
Dilemmas of Social Democracy: The Evolution of the Australian Labor Party’s Approach to Temporary Labour Migration
Creators: name: Foley, Emily
Publisher: name: La Trobe
Year: 2024
Subjects: classificationCode: 440403
subject: Labour, migration and development
classificationCode: 440801
subject: Australian government and politics

description: A thesis submitted in total fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Humanities and Social Sciences, La Trobe University, Victoria, Australia.
The Secrecy Graph and Some of its Properties
Creators: name: Haenggi, Martin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: Discrete Mathematics (cs.DM)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: G.2.2; G.3; H.1.1

description: A new random geometric graph model, the so-called secrecy graph, is introduced and studied. The graph represents a wireless network and includes only edges over which secure communication in the presence of eavesdroppers is possible. The underlying point process models considered are lattices and Poisson point processes. In the lattice case, analogies to standard bond and site percolation can be exploited to determine percolation thresholds. In the Poisson case, the node degrees are determined and percolation is studied using analytical bounds and simulations. It turns out that a small density of eavesdroppers already has a drastic impact on the connectivity of the secrecy graph.
description: 5 pages. Accepted at 2008 IEEE Symposium on Information Theory (ISIT'08)
DEVELOPMENT OF CREATIVE ABILITY IN STUDENTS WITH SPECIAL EDUCATION NEEDS
Creators: name: Usmanov, Sherzod
name: Abdulhamidova, Fatimakhan
Publisher: name: Zenodo
Year: 2023

description: This article is dedicated to the development of creative abilities in students with special educational needs, and the ways to develop creative abilities in students with special educational needs, to increase their interest in creative activities, and to solve these problems are described in detail.
Lattice Formulation of Two-Dimensional N=(2,2) SQCD with Exact Supersymmetry
Creators: name: Sugino, Fumihiko
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a lattice model for two-dimensional N=(2,2) supersymmetric QCD (SQCD), with the matter multiplets belonging to the fundamental or anti-fundamental representation of the gauge group U(N) or SU(N). The construction is based on the topological field theory (twisted supercharge) formulation and exactly preserves one supercharge along the line of the papers [1]--[4] for pure supersymmetric Yang-Mills theories. In order to avoid the species doublers of the matter multiplets, we introduce the Wilson terms and the model is defined for the case of the number of the fundamental matters (n_{+}) equal to that of the anti-fundamental matters (n_{-}). If some of the matter multiplets decouple from the theory by sending the corresponding anti-holomorphic twisted masses to the infinity, we can analyze the general n_{+}\neq n_{-} case, although the lattice model is defined for n_{+} =n_{-}. By computing the anomaly of the U(1)_A R-symmetry in the lattice perturbation, we see that the decoupling is achieved and the anomaly for n_{+}\neq n_{-} is correctly obtained.
description: 39 pages, no figures, LaTeX, (v2) some explanation added, (v3) misprint in eq.(3.19) corrected, (v4) version to be published in Nucl. Phys. B, (v5) a typo in eq.(A.12) fixed
The Chambers of Geography. Hypotheses on Places Where Other Places are Simulated
Creators: name: Tanca, Marcello
Publisher: name: Between
Year: 2021

description: The present study dovetails with topics previously discussed in my recent book Geografia e fiction (Tanca, 2020), with a particular focus on the link between geography and simulation. More specifically, I will reflect on places where simulations of the actual world take place. The hypothesis stems from the fascination exerted by simulating machines like magic lanterns, Wunderkammern, peepshows, panoramas, and dioramas, perspective boxes, virtual reality, etc. These ‘geographic chambers’ are all constructed situations producing an illusionistic mise en scène: the space compression occurring inside them enables us to immerse ourselves in places that are geographically very distant from us.
description: Between, Vol 11 No 22 (2021): Enclosed spaces. Prison, asylums, seclusions
Comparison of highly-compressed C2/m-SnH12 superhydride with conventional superconductors
Creators: name: Talantsev, E. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Satterthwaite and Toepke (1970 Phys. Rev. Lett. 25 741) predicted high-temperature superconductivity in hydrogen-rich metallic alloys, based on an idea that these compounds should exhibit high Debye frequency of the proton lattice, which boosts the superconducting transition temperature, Tc. The idea has got full confirmation more than four decades later when Drozdov et al (2015 Nature 525 73) experimentally discovered near-room-temperature superconductivity in highly-compressed sulphur superhydride, H3S. To date, more than a dozen of high-temperature hydrogen-rich superconducting phases in Ba-H, Pr-H, P-H, Pt-H, Ce-H, Th-H, S-H, Y-H, La-H, and (La,Y)-H systems have been synthesized and, recently, Hong et al (2021 arXiv:2101.02846) reported on the discovery of C2/m-SnH12 phase with superconducting transition temperature of Tc ~ 70 K. Here we analyse the magnetoresistance data, R(T,B), of C2/m-SnH12 phase and report that this superhydride exhibits the ground state superconducting gap of $Δ$(0) = 9.2 meV, the ratio of 2$Δ$(0)/k$_B$Tc = 3.3, and 0.010 < Tc/Tf < 0.014 (where Tf is the Fermi temperature) and, thus, C2/m-SnH12 falls into unconventional superconductors band in the Uemura plot.
description: 21 pages, 6 figures
Materiali nanostrutturati a base di copolimeri a blocchi per applicazioni in nanotecnologie
Creators: name: Di Girolamo, Rocco
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Il presente lavoro di tesi è incentrato sullo  studio di nuovi materiali a base di copolimeri a blocchi amorfi e semicristallini. Tali studi hanno evidenziato come sia possibile controllare il tipo di nanostruttura che si ottiene per separazione di fase, attraverso il controllo della cristallizzazione, utilizzando tecniche innovative basate sulla solidificazione direzionale da solventi cristallizzabili e sulla cristallizzazione epitassiale su opportuni supporti.
Sono stati studiati copolimeri a blocchi semiscristallini a base di polietilene (PE), polipropilene sindiotattico (sPP), poli(L-lattide) (PLLA) e poliossietilene (PEO). I copolimeri semicristallini a base di PE e sPP sono stati sintetizzati mediante nuovi catalizzatori metallorganici,  ed è stato effettuato uno studio strutturale e morfologico su tutti i campioni.
In particolare gli studi morfologici condotti su questi campioni hanno evidenziato come sia possibile controllare il tipo di nanostruttura che si ottiene per separazione di fase, attraverso il controllo della cristallizzazione in modo da  indurre la formazione di nanostrutture orientate a morfologia lamellare con ordine direzionale e periodicità dei nanodomini dei due blocchi a lungo raggio. Oltre ai copolimeri a blocchi semicristallini sono stati studiati  copolimeri formati da due blocchi amorfi, in particolare è stato studiato un copolimero costituito da un blocco di polistirene (PS) legato ad un blocco di polimetilmetacrilato (PMMA).
E’ stato messo appunto un semplice metodo che permette di realizzare devices elettronici con funzioni di memoria utilizzando come layer attivo la matrice polimerica nanostrutturata generata dal copolimero a blocchi PS-b-PMMA.
Modularized microfluidic synthesis of functional chitosan adsorbents for deep treatment of azo dye effluent
Creators: name: Yu, Qifan
name: Li, Yifei
name: Wang, Yuxin
name: Zhang, Hanyu
name: Qi, Menghua
name: Song, Liangjie
name: Chen, Lei
name: Bai, Zhishan
name: Wang, Bingjie
Publisher: name: Taylor & Francis
Year: 2025
Subjects: Biophysics
Space Science
Biotechnology
Environmental Sciences not elsewhere classified
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified

description: Multichannel integrated microfluidic technology retains the precise control characteristics of microfluidics. This technology is expected to replace traditional droplet preparation techniques for the batch production of adsorption materials with high performance and high monodispersity. In this study, porous chitosan microspheres (PCSM) were successfully synthesized using a self-developed modularized microfluidic system. As-prepared PCSMs were employed in adsorption separation of methyl orange (MO). The results proved that the average droplet size of PCSMs was 892 μm with the lowest coefficient of variation (CV), only 2.75%, while, the droplet flux was up to 210 mL·h−1. Batch static adsorption experiments showed that the saturated adsorption capacity of the adsorbent reached 215.26 ± 2.22 mg·g−1. Besides, the adsorption kinetics and equilibrium adsorption isotherm fitted pseudo-second-order kinetic model and Langmuir isotherm model well, respectively, indicating that the adsorption process is dominated by chemical reaction. Moreover, continuous adsorption experiment showed that under the conditions of initial solution concentration of 40 mg·L−1, bed diameter of 15 mm and filling height of 9.3 mm, the breakthrough time was 140 min, and the maximum adsorption capacity was up to 233.3 ± 4.30 mg·g−1. In addition, PCSMs exhibited stable regeneration performance and efficient selective adsorption for MO dyes in recycling (73.4% reabsorption productivity after 5 cycles). This study can provide theoretical support for the microfluidic batch synthesis and industrial application evaluation of high-performance adsorbents.
Correlation Strength, Gaps and Particle-Hole Asymmetry in High-Tc Cuprates: a Dynamical Mean Field Study of the Three-Band Copper-Oxide Model
Creators: name: Medici, Luca de'
name: Wang, Xin
name: Capone, Massimo
name: Millis, Andrew J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The three-band model relevant to high temperature copper-oxide superconductors is solved using single-site dynamical mean field theory and a tight-binding parametrization of the copper and oxygen bands. For a band filling of one hole per unit cell the metal/charge-transfer-insulator phase diagram is determined. The electron spectral function, optical conductivity and quasiparticle mass enhancement are computed as functions of electron and hole doping for parameters such that the corresponding to the paramagnetic metal and charge-transfer insulator sides of the one hole per cell phase diagram. The optical conductivity is computed using the Peierls phase approximation for the optical matrix elements. The calculation includes the physics of "Zhang-Rice singlets". The effects of antiferromagnetism on the magnitude of the gap and the relation between correlation strength and doping-induced changes in state density are determined. Three band and one band models are compared. The two models are found to yield quantitatively consistent results for all energies less than about 4eV, including energies in the vicinity of the charge-transfer gap. Parameters on the insulating side of the metal/charge-transfer insulator phase boundary lead to gaps which are too large and near-gap conductivities which are too small relative to data. The results place the cuprates clearly in the intermediate correlation regime, on the paramagnetic metal side of the metal/charge-transfer insulator phase boundary.
description: 9 pages, 6 figures. accepted by Phys. Rev. B
A new stochastic differential equation approach for waves in a random medium
Creators: name: Dimitropoulos, Dimitris
name: Jalali, Bahram
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a mathematical approach that simplifies the theoretical treatment of electromagnetic localization in random media and leads to closed form analytical solutions. Starting with the assumption that the dielectric permittivity of the medium has delta-correlated spatial fluctuations, and using the Ito lemma, we derive a linear stochastic differential equation for a one dimensional random medium. The equation leads to localized wave solutions. The localized wave solutions have a localization length that scales inversely with the square of the frequency of the wave in the low frequency regime, whereas in the high frequency regime, this length varies inversely with the frequency to the power of two thirds.
An Interval Analysis Based Study for the Design and the Comparison of 3-DOF Parallel Kinematic Machines
Creators: name: Chablat, Damien
name: Wenger, Philippe
name: Majou, Félix
name: Merlet, Jean-Pierre
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper addresses an interval analysis based study that is applied to the design and the comparison of 3-DOF parallel kinematic machines. Two design criteria are used, (i) a regular workspace shape and, (ii) a kinetostatic performance index that needs to be as homogeneous as possible throughout the workspace. The interval analysis based method takes these two criteria into account: on the basis of prescribed kinetostatic performances, the workspace is analysed to find out the largest regular dextrous workspace enclosed in the Cartesian workspace. An algorithm describing this method is introduced. Two 3-DOF translational parallel mechanisms designed for machining applications are compared using this method. The first machine features three fixed linear joints which are mounted orthogonally and the second one features three linear joints which are mounted in parallel. In both cases, the mobile platform moves in the Cartesian x-y-z space with fixed orientation.
New directions for Canadian railway demurrage
Creators: name: Kemp, Sidney William
Publisher: name: University of British Columbia
Year: 2010

description: This study reviews Canadian railway demurrage rules, questions its effectiveness and concludes with recommendations for change. The demurrage rules, their genesis and current interpretation are described in detail. The Canadian rules are placed in perspective by reviewing demurrage in other transportation modes as well as U.S. rail demurrage. Current effectiveness of the Canadian railway demurrage rules is assessed by analyzing C.N. Rail car release data. Canadian performance is then contrasted to U.S. performance and conclusions are drawn on the performance of the Canadian system, The study then identifies current issues with demurrage rates and arrangements. Through questionnaires and interviews a number of contentious issues are isolated. The study recommends that three major changes in Canadian demurrage rules be made. First, greater flexibility in negotiating exceptions should be provided for. Second, an incentive plan should be developed. Finally, a system of demurrage charges varying with the type of rail car detained should be incorporated into the demurrage tariff. Using C.N. Rail data, the impact of these recommendations on rail car utilization in Canada is simulated. Considerable reduction in car days and resulting rail car investment is observed.
Basis of totally primitive elements of WQSym
Creators: name: Mlodecki, Hugo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: By Foissy's work, the bidendriform structure of the Word Quasisymmetric Functions Hopf algebra (WQSym) implies that it is isomorphic to its dual. However, the only known explicit isomorphism does not respect the bidendriform structure. This structure is entirely determined by so-called totally primitive elements (elements such that the two half-coproducts are 0). In this paper, we construct a basis indexed by a new combinatorial family called biplane forests in bijection with packed words. In this basis, primitive elements are indexed by biplane trees and totally primitive elements by a certain subset of trees. Thus we obtain the first explicit basis for the totally primitive elements of WQSym.
Probing individual topological tunnelling events of a quantum field via their macroscopic consequences
Creators: name: Sahu, Mitrabhanu
name: Bae, Myung-Ho
name: Rogachev, Andrey
name: Pekker, David
name: Wei, Tzu-Chieh
name: Shah, Nayana
name: Goldbart, Paul M.
name: Bezryadin, Alexey
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Phase slips are topological fluctuation events that carry the superconducting order-parameter field between distinct current carrying states. Owing to these phase slips low-dimensional superconductors acquire electrical resistance. In quasi-one-dimensional nanowires it is well known that at higher temperatures phase slips occur via the process of thermal barrier-crossing by the order-parameter field. At low temperatures, the general expectation is that phase slips should proceed via quantum tunnelling events, which are known as quantum phase slips (QPS). Here we report strong evidence for individual quantum tunnelling events undergone by the superconducting order-parameter field in homogeneous nanowires.We accomplish this via measurements of the distribution of switching currents-the high-bias currents at which superconductivity gives way to resistive behaviour-whose width exhibits a rather counter-intuitive, monotonic increase with decreasing temperature. We outline a stochastic model of phase slip kinetics which relates the basic phase slip rates to switching rates. Comparison with this model indicates that the phase predominantly slips via thermal activation at high temperatures but at sufficiently low temperatures switching is caused by individual topological tunnelling events of the order-parameter field, i.e., QPS. Importantly, measurements on several wires show that quantum fluctuations tend to dominate over thermal fluctuations at larger temperatures in wires having larger critical currents. This fact provides strong supports the view that the anomalously high switching rates observed at low temperatures are indeed due to QPS, and not consequences of extraneous noise or hidden inhomogeneity of the wire.
description: 39 pages: added more experimental data and analysis
Robotica Educativa: Sviluppo di un Ambiente di Apprendimento Basato su Robot Lego
Creators: name: Calabretta, Maria Assunta
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Per robotica educativa si intende lo sviluppo e l’utilizzo di ambienti di apprendimento basati su tecnologie robotiche. In questa tesi, descriviamo i fondamenti teorici sottostanti a questa area di ricerca, gli ambienti di apprendimento più interessanti oggi a disposizione, i punti di forza e i problemi aperti nell’ambito di questa area. Inoltre presentiamo EduBot, un ambiente di apprendimento costituito da un robot costruito con componenti Lego Mindstorm, un ambiente software che consente di variare le caratteristiche del “sistema nervoso” del robot e di sottoporre il robot ad un processo di apprendimento, e una guida per l’utilizzo didattico. In Edubot, differentemente dagli altri ambienti disponibili, il robot non viene concepito come una macchina programmabile ma piuttosto come un modello semplificato di un organismo naturale. Ciò permette agli utilizzatori di acquisire una conoscenza sistemica di aree concettuali quali il sistema nervoso, il comportamento, e l’apprendimento, difficile da acquisire con metodi alternativi.
Cardy-Verlinde Formula in Taub-NUT/Bolt-(A)dS space
Creators: name: Lee, Chong OH
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a finite action for a higher dimensional Taub-NUT/Bolt-(A)dS space via the so-called counter term subtraction method. In the limit of high temperature, we show that the Cardy-Verlinde formula holds for the Taub-Bolt-AdS metric and for the specific dimensional Taub-NUT-(A)dS metric, except for the Taub-Bolt-dS metric.
description: Revtex4, 5 pages, typos corrected, version to appear in PLB
“PED/PEA-15 regulates wound healing and angiogenesis by affecting cytoskeletal organization and cell motility: a model for diabetic complications”
Creators: name: Buonomo, Roberta
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Failure in wound healing is a common feature of diabetes mellitus which severely affects morbidity and mortality. We evaluated wound healing in the skin of transgenic mice (TgPED) over-expressing ped/pea-15, a gene over-expressed in patients with type 2 diabetes.Up to four days after the injury, the distance between wound edges was 3-fold higher in TgPED mice compared to their wild-type littermates (Wt). TgPED mice also presented significantly reduced granulation tissue formation as compared to Wt. Moreover, the wounded skin of TgPED exhibited also a reduced content of activated fibroblasts, collagen fibres and an increased detection of infiltrated inflammatory cells. These histological alterations were accompanied, in TgPED speciments, by an increased production of inflammatory cytokines and a defect of neo-angiogenesis process. Then we isolated endothelial cells and fibroblasts from TgPED and Wt mice, mainly involved in the formation of the granulation tissue, the first regenerative tissue that closes the skin gap. Endothelial cells and skin fibroblasts isolated from TgPED and Wt mice showed reduced healing ability in scratch wound healing assays compared to control cells. Furthermore, in time-lapse experiments, TgPED fibroblasts displayed about 2-fold lower velocity and diffusion coefficient, as compared with Wt. These changes were accompanied by reduced spreading and decreased formation of stress fibres and focal adhesion plaques. At molecular level, TgPED fibroblasts displayed decreased RhoA membrane content and increased cytosolic abundance of phosphorylated ERK1/2. Inhibition of ERK1/2 activity by PD98059 restored RhoA membrane translocation, cytoskeleton organization and cell motility and almost completely rescued wound healing ability of TgPED fibroblasts and can be expanded to endothelial cells. Interestingly, fibroblasts isolated from ped/pea-15 null mice (KO) displayed an increased motility and spreading compared to control cells. These results strongly support a role of PED/PEA-15 in the regulation of cell motility during skin wound healing. Moreover, the control exerted by PED/PEA-15 on cell migration is not restricted to fibroblasts. Considering the different known cellular function of PED/PEA-15 in a chronic disorder such as diabetes, the observation that PED/PEA-15 regulates cellular motility and skin wound healing in TgPED mice may suggest these mice as model to study the role of PED/PEA-15 in diabetic complications.
Kinematic Calibration of the Orthoglide-Type Mechanisms
Creators: name: Pashkevich, Anatoly
name: Chablat, Damien
name: Wenger, Philippe
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The paper proposes a novel calibration approach for the Orthoglide-type mechanisms based on observations of the manipulator leg parallelism during motions between the prespecified test postures. It employs a low-cost measuring system composed of standard comparator indicators attached to the universal magnetic stands. They are sequentially used for measuring the deviation of the relevant leg location while the manipulator moves the TCP along the Cartesian axes. Using the measured differences, the developed algorithm estimates the joint offsets that are treated as the most essential parameters to be adjusted. The sensitivity of the measurement methods and the calibration accuracy are also studied. Experimental results are presented that demonstrate validity of the proposed calibration technique.
Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
Creators: name: Yildirim, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: From first principles calculations we find that the nearest and next nearest neighbor superexchange interactions between Fe ions in LaOFeAs are large, antiferromagnetic (AF), and give rise to a frustrated magnetic ground state which consists of two interpenerating AF square sublattices with M(Fe)=0.48$μ_B$. The system lowers its energy further by removing the frustration via a structural distortion. These results successfully explain the magnetic and structural phase transitions in LaOFeAs recently observed by neutron scattering. The presence of competing strong antiferromagnetic exchange interactions and the frustrated ground state suggest that magnetism and superconductivity in doped LaOFeAs may be strongly coupled, much like in the high-T$_c$ cuprates.
description: 4.2 pages, 5 figures, see http://www.ncnr.nist.gov/staff/taner/laofeas for more information
Analysis, Control and Synchronization of
nonlinear systems and networks via Contraction
Theory: theory and applications
Creators: name: Russo, Giovanni
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: The aim of the Thesis is that of providing a coherent theoretical framework for the study of networked systems, modeled by means of Ordinary Differential Equations(ODEs) with applications to biochemical networks. In particular, our interest is twofold. For interconnected systems, we explore the dynamical mechanisms which are responsible for the emergence of some coherent (coordinated) network dynamics. From the control viewpoint, we are interested in
providing guidelines for the design of decentralized communication strategies (or protocols) for the network nodes which ensure some desired form of coordination.
For biochemical systems, the analysis is focussed on understanding the key dynamical properties which are responsible for the system’s behavior, or functionality. The
main results for the analysis/control of interconnected systems that are presented in the Thesis are based on the use of a generalized version of contraction theory.
Deconvolution by simulation
Creators: name: Mallows, Colin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Computation (stat.CO)
subject: FOS: Computer and information sciences
subject: 60J10, 62G05, 94C99 (Primary)

description: Given samples (x_1,...,x_m) and (z_1,...,z_n) which we believe are independent realizations of random variables X and Z respectively, where we further believe that Z=X+Y with Y independent of X, the problem is to estimate the distribution of Y. We present a new method for doing this, involving simulation. Experiments suggest that the method provides useful estimates.
description: Published at http://dx.doi.org/10.1214/074921707000000021 in the IMS Lecture Notes Monograph Series (http://www.imstat.org/publications/lecnotes.htm) by the Institute of Mathematical Statistics (http://www.imstat.org)
Differente effetto di diete iperlipidiche ricche in lardo o olio di pesce sull’insorgenza dell’obesità, steatosi epatica ed insulino-resistenza.
Creators: name: Gaita, Marcello
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Il lavoro sperimentale è stato focalizzato sullo studio dell’effetto di differenti diete iperlipidiche, ricche in lardo e olio di pesce, sullo sviluppo dell’obesità, steatosi epatica ed insulino-resistenza. E' noto da tempo l'effetto benefico dell’olio di pesce nel ridurre le patologie cardiovascolari e le metaboliche. Proprio per questo motivo ho condotto delle analisi volte ad accertare come l’utilizzo di olio di pesce in diete iperlipidiche somministrate a ratti potesse agire sull’efficienza energetica mitocondriale e su quella corporea totale. In particolare sono stati valutati a livello corporeo totale, diversi parametri quali: composizione corporea, bilancio energetico, e livelli ematici di ormoni e metaboliti specifici. Inoltre è stata valutata anche la resistenza all’insulina e la tolleranza al glucosio e a livello mitocondriale epatico e muscolare: la velocità di ossidazione degli acidi grassi, l’efficienza mitocondriale e lo stress ossidativo. I risultati hanno mostrato come diete ad elevato contenuto di omega 3 portano ad un minore sviluppo dell’obesità, steatosi epatica ed insulino-rersistenza.
Density inhomogeneity driven percolation metal-insulator transition and dimensional crossover in graphene nanoribbons
Creators: name: Adam, S.
name: Cho, S.
name: Fuhrer, M. S.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Transport in graphene nanoribbons with an energy gap in the spectrum is considered in the presence of random charged impurity centers. At low carrier density, we predict and establish that the system exhibits a density inhomogeneity driven two dimensional metal-insulator transition that is in the percolation universality class. For very narrow graphene nanoribbons (with widths smaller than the disorder induced length-scale), we predict that there should be a dimensional crossover to the 1D percolation universality class with observable signatures in the transport gap. In addition, there should be a crossover to the Boltzmann transport regime at high carrier densities. The measured conductivity exponent and the critical density are consistent with this percolation transition scenario.
description: Revised version published in Phys. Rev. Lett. 101, 046404 (2008)
Bayesian Limits on Primordial Isotropy Breaking
Creators: name: Armendariz-Picon, C.
name: Pekowsky, Larne
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is often assumed that primordial perturbations are statistically isotropic, which implies, among other properties, that their power spectrum is invariant under rotations. In this article, we test this assumption by placing model-independent bounds on deviations from rotational invariance of the primordial spectrum. Using five-year WMAP cosmic microwave anisotropy maps, we set limits on the overall norm and the amplitude of individual components of the primordial spectrum quadrupole. We find that there is no significant evidence for primordial isotropy breaking, and that an eventually non-vanishing quadrupole has to be subdominant.
description: 6 double-column pages, 2 figues and 2 tables. Uses REVTeX4
The Design of a Novel Prismatic Drive for a Three-DOF Parallel-Kinematics Machine
Creators: name: Renotte, Jérome
name: Chablat, Damien
name: Angeles, Jorge
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The design of a novel prismatic drive is reported in this paper. This transmission is based on Slide-O-Cam, a cam mechanism with multiple rollers mounted on a common translating follower. The design of Slide-O-Cam was reported elsewhere. This drive thus provides pure-rolling motion, thereby reducing the friction of rack-and-pinions and linear drives. Such properties can be used to design new transmissions for parallel-kinematics machines. In this paper, this transmission is optimized to replace ball-screws in Orthoglide, a three-DOF parallel robot optimized for machining applications.
Trace Anomaly Inflation in Brane Induced Gravity
Creators: name: Corradini, Olindo
name: Iglesias, Alberto
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In the present letter we find that Starobinsky's inflationary solution is also valid in the Dvali-Gabadadze-Porrati (DGP) model where a 3-brane is embedded in 5-dimensional Minkowski bulk. We show that such a solution is typically not supported by the Self-Accelerated branch of the model, giving therefore a natural selection of the conventional branch of solutions. In the absence of brane induced Einstein-Hilbert term the SA branch is always selected out. We then study the linearized modes around all such de Sitter brane solutions finding perturbative stability for a range of parameters of the brane QFT.
description: 15 pages; minor rephrasing of a few sentences (to appear in JCAP)
Ambiguity Rate of Hidden Markov Processes
Creators: name: Jurgens, Alexandra M.
name: Crutchfield, James P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The $ε$-machine is a stochastic process' optimal model -- maximally predictive and minimal in size. It often happens that to optimally predict even simply-defined processes, probabilistic models -- including the $ε$-machine -- must employ an uncountably-infinite set of features. To constructively work with these infinite sets we map the $ε$-machine to a place-dependent iterated function system (IFS) -- a stochastic dynamical system. We then introduce the ambiguity rate that, in conjunction with a process' Shannon entropy rate, determines the rate at which this set of predictive features must grow to maintain maximal predictive power. We demonstrate, as an ancillary technical result which stands on its own, that the ambiguity rate is the (until now missing) correction to the Lyapunov dimension of an IFS's attractor. For a broad class of complex processes and for the first time, this then allows calculating their statistical complexity dimension -- the information dimension of the minimal set of predictive features.
description: 13 pages, 9 figures; supplementary material, 3 pages, 1 figure; http://csc.ucdavis.edu/~cmg/compmech/pubs/arhmp.htm
Relaxation of a one-dimensional Mott insulator after an interaction quench
Creators: name: Kollar, Marcus
name: Eckstein, Martin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We obtain the exact time evolution for the one-dimensional integrable fermionic 1/r Hubbard model after a sudden change of its interaction parameter, starting from either a metallic or a Mott-insulating eigenstate. In all cases the system relaxes to a new steady state, showing that the presence of the Mott gap does not inhibit relaxation. The properties of the final state are described by a generalized Gibbs ensemble. We discuss under which conditions such ensembles provide the correct statistical description of isolated integrable systems in general. We find that generalized Gibbs ensembles do predict the properties of the steady state correctly, provided that the observables or initial states are sufficiently uncorrelated in terms of the constants of motion.
description: 9 pages, 1 figure; published version
Coexistence of superconductivity and antiferromagnetism in self-doped bilayer t-t'-J model
Creators: name: Gan, J. Y.
name: Mori, M.
name: Lee, T. K.
name: Maekawa, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A self-doped bilayer t-t'-J model of an electron- and a hole-doped planes is studied by the slave-boson mean-field theory. A hopping integral between the differently doped planes, which are generated by a site potential, are renormalized by the electron-electron correlation. We find coexistent phases of antiferromagnetic (AFM) and superconducting orders, although the magnitudes of order parameters become more dissimilar in the bilayer away from half-filling. Fermi surfaces (FS's) with the AFM order show two pockets around the nodal and the anti-nodal regions. These results look like a composite of electron- and hole-doped FS's. In the nodal direction, the FS splitting is absent even in the bilayer system, since one band is flat due to the AFM order.
description: 6 pages, 4 figures
Beniamino Della Gala, Adrien Frenay, Filippo Milani, Lucia Quaquarelli (eds.), Lasciate socchiuse le porte. Mobilità, attraversamenti, sconfinamenti
Creators: name: Seligardi, Beatrice
Publisher: name: Between
Year: 2021

description: Recensione di Beniamino Della Gala, Adrien Frenay, Filippo Milani, Lucia Quaquarelli (eds.), Lasciate socchiuse le porte. Mobilità, attraversamenti, sconfinamenti
description: Between, Vol 11 No 22 (2021): Enclosed spaces. Prison, asylums, seclusions
Bartolo Anglani «Sans issue». Commento all’«Étranger» di Camus.
Creators: name: Matteini, David
Publisher: name: Between
Year: 2021

description: Recensione di Bartolo Anglani «Sans issue». Commento all’«Étranger» di Camus.
description: Between, Vol 11 No 22 (2021): Enclosed spaces. Prison, asylums, seclusions
Robert T. Tally Jr. (ed.), Spatial Literary Studies: Interdisciplinary Approaches to Space, Geography, and the Imagination
Creators: name: Confalonieri, Corrado
Publisher: name: Between
Year: 2021

description: Recensione del volume di Robert T. Tally Spatial Literary Studies: Interdisciplinary Approaches to Space, Geography, and the Imagination.
description: Between, Vol 11 No 22 (2021): Enclosed spaces. Prison, asylums, seclusions
Cartographic records in archives : a shared resource
Creators: name: Hutchison, Margaret Mary
Publisher: name: University of British Columbia
Year: 2010

description: Cartography is often viewed as such an esoteric discipline employing art and science in the creation of records that little is known outside cartographic agencies about the evolution of the maps. Archives concerned with acquiring cartographic records have tended to concentrate on collecting the published maps. Maps are most often consulted for their illustrative value or reference quality. However, this illustrative value often obscures the character and evidential value of maps. This thesis attempts to show that cartographic materials have important evidential value and that archives have a responsibility to help ensure this value is recognized both in the acquisition of records and in their eventual use. The first problem for archives is to identify the full range of the cartographic record both in terms of agencies which produce cartographica and the records generated within each agency. Therefore, this study examines the range of cartographic records which have been produced in British Columbia over time, and the types of cartographic records three British Columbia repositories acquire. The second problem is that archivists need to gain an awareness of the cartographic communication process itself. To this end, this study outlines some aspects of cartographic communication which bear on matters of archival administration. Each of these in turn affects the appraisal of the evidential values of cartographic records. These indications of the complexity, together with the increasing sophistication, of the cartographic records argue strongly for the archivist's knowledgeability about their production as an aid in their use or interpretation. Cartographic materials have a valid place in archives but the archivist must take an active part in acquiring and understanding the records documenting the intervening procedures between data collection and map publication. Maps can serve a wider public and archives can be an important milieu for the more comprehensive use of the medium by acquiring the full range of cartographic records as well as helping researchers towards a better understanding of the motivating ideas behind the records they are using.
Calibration of quasi-isotropic parallel kinematic Machines: Orthoglide
Creators: name: Pashkevich, Anatoly
name: Gomolitsky, Roman
name: Wenger, Philippe
name: Chablat, Damien
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The paper proposes a novel approach for the geometrical model calibration of quasi-isotropic parallel kinematic mechanisms of the Orthoglide family. It is based on the observations of the manipulator leg parallelism during motions between the specific test postures and employs a low-cost measuring system composed of standard comparator indicators attached to the universal magnetic stands. They are sequentially used for measuring the deviation of the relevant leg location while the manipulator moves the TCP along the Cartesian axes. Using the measured differences, the developed algorithm estimates the joint offsets and the leg lengths that are treated as the most essential parameters. Validity of the proposed calibration technique is confirmed by the experimental results.
TERMINOLOGY AS A DISTINCT LEXICAL SUBSYSTEM WITHIN A LANGUAGE.
Creators: name: Raimov, Lazizjon
Publisher: name: Zenodo
Year: 2023

description: This article encompasses an exploration of terminology and terminological vocabulary within linguistics. It involves a critical examination of fundamental terminology concepts such as terminology, term, term field, terminological system, and sublanguage. The aim is to define the position and limits of terminological vocabulary in relation to other lexical subsystems of the language. Additionally, the article seeks to identify key parameters for constructing terminology in both Uzbek and English.
Spatial distribution and galactic model parameters of cataclysmic variables
Creators: name: Ak, T.
name: Bilir, S.
name: Ak, S.
name: Eker, Z.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The spatial distribution, galactic model parameters and luminosity function of cataclysmic variables (CVs) in the solar neighbourhood have been determined from a carefully established sample of 459 CVs. The sample contains all of the CVs with distances computed from the Period-Luminosity-Colours (PLCs) relation of CVs which has been recently derived and calibrated with {\em 2MASS} photometric data. It has been found that an exponential function fits best to the observational z-distributions of all of the CVs in the sample, non-magnetic CVs and dwarf novae, while the sech^{2} function is more appropriate for nova-like stars and polars. The vertical scaleheight of CVs is 158$\pm$14 pc for the {\em 2MASS} J-band limiting apparent magnitude of 15.8. On the other hand, the vertical scaleheights are 128$\pm$20 and 160$\pm$5 pc for dwarf novae and nova-like stars, respectively. The local space density of CVs is found to be $\sim3\times10^{-5}$ pc^{-3} which is in agreement with the lower limit of the theoretical predictions. The luminosity function of CVs shows an increasing trend toward higher space densities at low luminosities, implying that the number of short-period systems should be high. The discrepancies between the theoretical and observational population studies of CVs will almost disappear if for the z-dependence of the space density the sech^{2} density function is used.
description: 29 pages, 9 figures and 5 tables, accepted for publication in New Astronomy
Screening, Kohn anomaly, Friedel oscillation, and RKKY interaction in bilayer graphene
Creators: name: Hwang, E. H.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate the screening function in bilayer graphene (BLG) both in the intrinsic (undoped) and the extrinsic (doped) regime within random phase approximation, comparing our results with the corresponding single layer graphene (SLG) and the regular two dimensional electron gas (2DEG). We find that the Kohn anomaly is strongly enhanced in BLG. We also discuss the Friedel oscillation and the RKKY interaction, which are associated with the non-analytic behavior of the screening function at $q=2k_F$. We find that the Kohn anomaly, the Friedel oscillation, and the RKKY interaction are all qualitatively different in the BLG compared with the SLG and the 2DEG.
description: 4 pages, 3 figures