cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Glass-like phonon scattering from a spontaneous nanostructure in AgSbTe2
Creators: name: Ma, J.
name: Delaire, O.
name: May, A. F.
name: Carlton, C. E.
name: McGuire, M. A.
name: VanBebber, L. H.
name: Abernathy, D. L.
name: Ehlers, G.
name: Hong, Tao
name: Huq, A.
name: Tian, Wei
name: Keppens, V. M.
name: Shao-Horn, Y.
name: Sales, B. C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Materials with very low thermal conductivity are of high interest for both thermoelectric and optical phase-change applications. Synthetic nanostructuring is most promising to suppress thermal conductivity by scattering phonons, but challenges remain in producing bulk samples. We show that in crystalline AgSbTe$_2$, a spontaneously-forming nanostructure leads to a suppression of thermal conductivity to a glass-like level. Our mapping of the phonon mean-free-paths provides a novel bottom-up microscopic account of thermal conductivity, and also reveals intrinsic anisotropies associated with the nanostructure. Ground-state degeneracy in AgSbTe$_2$ leads to the natural formation of nanoscale domains with different orderings on the cation sublattice, and correlated atomic displacements, which efficiently scatter phonons. This mechanism is general and points to a new avenue in nano-scale engineering of materials, to achieve low thermal conductivities for efficient thermoelectric converters and phase-change memory devices.
Motifs didactiques et représentation visuelle de la discipline: sources de transformation chez les stagiaires en formation des maîtres
Creators: name: Tochon, François Victor
name: Okten, Celile E.
Publisher: name: TCI (Transnational Curriculum Inquiry)
Year: 2010

description: La sémiotique implique des processus de recherche qui intègrent la dimension humaine dans l’analyse du raisonnement logique. Cet article est une tentative d’interpréter la “trans-sémiose” ou production transformatrice du sens que les professeurs stagiaires mettent en oeuvre lorsqu’ils établissent, soit personnellement soit en commun, la carte de leurs connaissances de la discipline enseignée. Les auteurs de l’article utilisent le modèle de raisonnement proposé par Shank et Cunningham dans la ligne des travaux de Charles S. Peirce pour comprendre le processus de formation disciplinaire, c’est à dire la manière dont le savoir est organisé dans la didactique de la discipline, dont il devient conscient et transforme les enseignants prospectifs. La recherche explore la compétence des stagiaires à modéliser leur discipline, qui est l’anglais langue étrangère, et investigue la croissance de leur identité professionnelle. Leur capacité de réflexion, leur intuition, leurs valeurs, représentations et convictions relatives à la discipline sont tous des aspects à travers lesquels émerge le sens didactique, au fils d’observations qui ont été associées à des interviews écrites et orales. L’article apporte des indications sur les apports de la cartographie didactique de la discipline enseignée, en termes du raisonnement logique, social et politique sur la matière enseignée dont l’explicitation s’inscrit dans une sémiose constructive et transformatrice.
description: TCI (Transnational Curriculum Inquiry), Vol. 7 No. 1 (2010)
Ptychography by changing the area of probe light and scaled ptychography
Creators: name: Shimobaba, Tomoyoshi
name: Kakue, Takashi
name: Okada, Naohisa
name: Endo, Yutaka
name: Hirayama, Ryuji
name: Hiyama, Daisuke
name: Ito, Tomoyoshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Ptychography is a promising phase retrieval technique for visible light, X-ray and electron beams. Conventional ptychography reconstructs the amplitude and phase of an object light from a set of the diffraction intensity patterns obtained by the X-Y moving of the probe light. The X-Y moving of the probe light requires two control parameters and accuracy of the locations. We propose ptychography by changing the area of the probe light using only one control parameter, instead of the X-Y moving of the probe light. The proposed method has faster convergence speed. In addition, we propose scaled ptychography using scaled diffraction calculation in order to magnify retrieved object lights clearly.
Conversing about ‘self-creation,’ ‘the third space,’ and ‘harmony/control’: an essay review of The Call from the Stranger on a Journey Home by Hongyu Wang
Creators: name: Woo, Yen Yen Joyceln
name: Boyanton, Dengting
Publisher: name: TCI (Transnational Curriculum Inquiry)
Year: 2009

description: There is no abstract for this book review.
description: TCI (Transnational Curriculum Inquiry), Vol. 5 No. 2 (2008)
Ecology, ecocriticism and learning: how do places become ‘pedagogical’?
Creators: name: Gough, Noel
Publisher: name: TCI (Transnational Curriculum Inquiry)
Year: 2009

description: As an academic educator with unabashed ecopolitical commitments and a disposition to deconstruction, I treat assertions about the relations of ‘places’ (especially ‘natural’ places) to ‘pedagogies’ somewhat sceptically. For example, although I sympathise with the spirit of David Gruenewald’s assertion that ‘places are profoundly pedagogical’, I find it more difficult to accept the abrogation (or displacement) of human agency that might be implied by statements such as ‘places teach us about how the world works’ and ‘places make us’. Following Deleuze and Guattari, I argue that places become and that processes of ‘becoming-pedagogical’ are matters of human invention and fabrication. I explore some of the ways in which places ‘becoming-pedagogical’ might be related to such modalities of nature as the ways that nature is envisioned and named, the speed at which nature is traversed and transformed, and the affects (images, concepts, senses) of nature that are subsequently produced.
description: TCI (Transnational Curriculum Inquiry), Vol. 5 No. 1 (2008): Eco-learning: an Australian gathering
Traveling-wave deceleration of SrF molecules
Creators: name: Berg, J. E. van den
name: Mathavan, S. C.
name: Meinema, C.
name: Nauta, J.
name: Nijbroek, T. H.
name: Jungmann, K.
name: Bethlem, H. L.
name: Hoekstra, S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We report on the production, deceleration and detection of a SrF molecular beam. The molecules are captured from a supersonic expansion and are decelerated in the X$^2Σ^+ (v=0, N=1)$ state. We demonstrate the removal of up to 40% of the kinetic energy with a 2 meter long modular traveling-wave decelerator. Our results demonstrate a crucial step towards the preparation of ultracold gases of heavy diatomic molecules for precision spectroscopy.
Numerical investigation of the impact of injectors location on fuel mixing in the HIFiRE 2 Scramjet combustor
Creators: name:  SASI KIRAN PALATEERDHAM
name:   LAKSHMI NARAYANA PHANEENDRA PERI
name:   ANTONELLA INGENITO
name:   ASHISH VASHISHTHA
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: SCRAMJET
COMBUSTION
HYPERSONIC PROPULSION
AEROSPACE
CFD
COMBUSTION CHEMISTRY
GREEN TRANSPORTATION

description: In scramjets, the position and direction of the injectors plays a crucial role for fuel/air mixmg and combustion efficiency. Fuel injection is still a potential topic of research to be addressed, in fact an effective fuel injection strategy is critical for increasing the streamwise vorticity that has been found to be the main responsible for the fuel-air mixing in compressible flows. In fact, the position and the direction of the fuel injectors, the presence of a cavity scramjet has a critical influence on the density and pressure gradients, and consequently on the baroclinic tenn that is a source of vorticity. In this regard, this research wants to investigate the nature of the mixing in supersonic flows, investigating the contribution between the streamwise and stretching component for the vorticity. Numerical modelling of supersonic combustion using Large Eddy Simulations was carried out in HIFiRE 2 Scramjet to better understand the physics of the combustion and mixing.
Review of Early Childhood Education: Society and Culture (edited by Angela Anning, Joy Cullen and Marilyn Fleer)
Creators: name: Sellers, Marg
Publisher: name: TCI (Transnational Curriculum Inquiry)
Year: 2007

description: This book review has no abstract.
description: TCI (Transnational Curriculum Inquiry), Vol. 4 No. 2 (2007)
On the Schrödinger equation with potential in modulation spaces
Creators: name: Cordero, Elena
name: Nicola, Fabio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 35S30, 47G30, 42C15

description: This work deals with Schrödinger equations with quadratic and sub-quadratic Hamiltonians perturbed by a potential. In particular we shall focus on bounded, but not necessarily smooth perturbations. We shall give a representation of such evolution as the composition of a metaplectic operator and a pseudodifferential operator having symbol in certain classes of modulation spaces. About propagation of singularities, we use a new notion of wave front set, which allows the expression of optimal results of propagation in our context. To support this claim, many comparisons with the existing literature are performed in this work.
description: 25 pages
Spatiotemporal synchronization of drift waves in a magnetron sputtering plasma
Creators: name: Martines, E.
name: Zuin, M.
name: Cavazzana, R.
name: Adámek, J.
name: Antoni, V.
name: Serianni, G.
name: Spolaore, M.
name: Vianello, N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A feedforward scheme is applied for drift waves control in a magnetized magnetron sputtering plasma. A system of driven electrodes collecting electron current in a limited region of the explored plasma is used to interact with unstable drift waves. Drift waves actually appear as electrostatic modes characterized by discrete wavelengths of the order of few centimeters and frequencies of about 100 kHz. The effect of external quasi-periodic, both in time and space, travelling perturbations is studied. Particular emphasis is given to the role played by the phase relation between the natural and the imposed fluctuations. It is observed that it is possible by means of localized electrodes, collecting currents which are negligible with respect to those flowing in the plasma, to transfer energy to one single mode and to reduce that associated to the others. Due to the weakness of the external action, only partial control has been achieved.
description: Submitted to Physics of Plasmas
Synthesis of sub-5 nm Co-doped SnO$_2$ nanoparticles and their structural, microstructural, optical and photocatalytic properties
Creators: name: Entradas, T.
name: Cabrita, J.
name: Dalui, S.
name: Nunes, M. R.
name: Monteiro, O. C.
name: Silvestre, A. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A swift chemical route to synthesize Co-doped SnO$_2$ nanopowders is described. Pure and highly stable Sn$_{1-x}$Co$_x$O$_{2-δ}$ (0 $\le$ x $\le$ 0.15) crystalline nanoparticles were synthesized, with mean grain sizes < 5 nm and the dopant element homogeneously distributed in substitutional sites of the SnO$_2$ matrix. The UV-visible diffuse reflectance spectra of the Sn$_{1-x}$Co$_x$O$_{2-δ}$ samples reveal red shifts, the optical bandgap energies decreasing with increasing Co concentration. The Urbach energies of the samples were calculated and correlated with their bandgap energies. The photocatalytic activity of the Sn$_{1-x}$Co$_x$O$_{2-δ}$ samples was investigated for the 4-hydroxylbenzoic acid (4-HBA) degradation process. A complete photodegradation of a 10 ppm 4-HBA solution was achieved using 0.02% (w/w) of Sn$_{0.95}$Co$_{0.05}$O$_{2-δ}$ nanoparticles in 60 min of irradiation.
description: 29 pages, 2 tables, 10 figures
CoRoT 105906206: a short-period and totally eclipsing binary with a Delta Scuti type pulsator
Creators: name: da Silva, Ronaldo
name: Maceroni, Carla
name: Gandolfi, Davide
name: Lehmann, Holger
name: Hatzes, Artie P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Eclipsing binary systems with pulsating components allow the determination of several physical parameters of the stars, such as mass and radius, that, when combined with the pulsation properties, can be used to constrain the modeling of stellar interiors and evolution. Hereby, we present the results of the study of CoRoT 105906206, an eclipsing binary system with a pulsating component located in the CoRoT LRc02 field. The analysis of the CoRoT light curve was complemented by high-resolution spectra from the Sandiford at McDonald Observatory and FEROS at ESO spectrographs, which revealed a double-lined spectroscopic binary. We used an iterative procedure to separate the pulsation-induced photometric variations from the eclipse signals. First, a Fourier analysis was used to identify the significant frequencies and amplitudes due to pulsations. Second, after removing the contribution of the pulsations from the light curve we applied the PIKAIA genetic-algorithm approach to derive the best parameters that describe the orbital properties of the system. The light curve cleaned for pulsations contains the partial eclipse of the primary and the total eclipse of the secondary. The system has an orbital period of about 3.694 days and is formed by a primary star with mass M1 = 2.25 +/- 0.04 solar masses, radius R1 = 4.24 +/- 0.02 solar radii, and effective temperature Teff1 = 6750 +/- 150 K, and a secondary with M2 = 1.29 +/- 0.03 solar masses, R2 = 1.34 +/- 0.01 solar radii, and Teff2 = 6152 +/- 162 K. The best solution for the parameters was obtained by taking into account the asymmetric modulation observed in the light curve, known as the O'Connell effect, presumably caused by Doppler beaming. The analysis of the Fourier spectrum revealed that the primary component has p-mode pulsations in the range 5-13 c/d, which are typical of Delta Scuti type stars.
description: 11 pages, 8 figures, 3 tables
Resilience and Controllability of Dynamic Collective Behaviors
Creators: name: Komareji, Mohammad
name: Bouffanais, Roland
Publisher: name: arXiv
Year: 2014
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: The network paradigm is used to gain insight into the structural root causes of the resilience of consensus in dynamic collective behaviors, and to analyze the controllability of the swarm dynamics. Here we devise the dynamic signaling network which is the information transfer channel underpinning the swarm dynamics of the directed interagent connectivity based on a topological neighborhood of interactions. The study of the connectedness of the swarm signaling network reveals the profound relationship between group size and number of interacting neighbors, which is found to be in good agreement with field observations on flock of starlings [Ballerini et al. (2008) Proc. Natl. Acad. Sci. USA, 105: 1232]. Using a dynamical model, we generate dynamic collective behaviors enabling us to uncover that the swarm signaling network is a homogeneous clustered small-world network, thus facilitating emergent outcomes if connectedness is maintained. Resilience of the emergent consensus is tested by introducing exogenous environmental noise, which ultimately stresses how deeply intertwined are the swarm dynamics in the physical and network spaces. The availability of the signaling network allows us to analytically establish for the first time the number of driver agents necessary to fully control the swarm dynamics.
Multi-Objective Controller Optimization and Robustness Analysis by the Example of Electro-Mechanical Flight Surface Actuation
Creators: name:  KOLJA MICHEL
name:   CHRISTIAN SCHALLERT
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: OPTIMIZATION
CONTROL
ROBUSTNESS
WORST-CASE SEARCH
EMA
CONTROL SURFACE
ACTUATION

description: In this paper the adaption of the software environment \'Multi-Objective Parameter Synthesis\' (MOPS) for controller gain optimization is presented. The definition of the optimization criteria, as well as their implementation to the optimization environment are shown. Worst-case searches are conducted to evaluate the effect of uncertainties on the control loop\'s performance and stability. The methodology of this controller optimization and robustness analysis are demonstrated by means of the torque control for electromechanical flight surface actuation. This technology is pursued for future commercial aircraft.
Surface potential at a ferroelectric grain due to asymmetric screening of depolarization fields
Creators: name: Genenko, Yuri A.
name: Hirsch, Ofer
name: Erhart, Paul
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Nonlinear screening of electric depolarization fields, generated by a stripe domain structure in a ferroelectric grain of a polycrystalline material, is studied within a semiconductor model of ferroelectrics. It is shown that the maximum strength of local depolarization fields is rather determined by the electronic band gap than by the spontaneous polarization magnitude. Furthermore, field screening due to electronic band bending and due to presence of intrinsic defects leads to asymmetric space charge regions near the grain boundary, which produce an effective dipole layer at the surface of the grain. This results in the formation of a potential difference between the grain surface and its interior of the order of 1 V, which can be of either sign depending on defect transition levels and concentrations. Exemplary acceptor doping of BaTiO3 is shown to allow tuning of the said surface potential in the region between 0.1 and 1.3 V.
description: 14 pages, 11 figures, submitted to J. Appl. Phys
Compliant high support stiffness rocket gimbal for Thrust Vector Control on liquid engine
Creators: name:  GUILLAUME HUEBER
name:   JEREMIE HUSER
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: COMPLIANT
GIMBAL
TVC
FLEXIBLE
MECHANISM
ROCKET
LIQUID ENGINE

description: In recent years, there has been increasing interest in the development of compliant mechanisms for use in aerospace applications. This paper presents the design, the theoretical model and testing of a compliant, high support stiffness two degrees of freedom gimbal prototype used for thrust vector control of a rocket engine. The design decisions taken to meet specifications are described. An analytical model is developed and compared to a pivot compression test. A final design of the gimbal assembly is prototyped.
Theory of adhesion: role of surface roughness
Creators: name: Persson, Bo N. J.
name: Scaraggi, Michele
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We discuss how surface roughness influence the adhesion between elastic solids. We introduce a Tabor number which depends on the length scale or magnification, and which gives information about the nature of the adhesion at different length scales. We consider two limiting cases relevant for (a) elastically hard solids with weak adhesive interaction (DMT-limit) and (b) elastically soft solids or strong adhesive interaction (JKR-limit). For the former cases we study the nature of the adhesion using different adhesive force laws ($F\sim u^{-n}$, $n=1.5-4$, where $u$ is the wall-wall separation). In general, adhesion may switch from DMT-like at short length scales to JKR-like at large (macroscopic) length scale. We compare the theory predictions to the results of exact numerical simulations and find good agreement between theory and the simulation results.
Efficient fidelity control by stepwise nucleotide selection in polymerase elongation
Creators: name: Yu, Jin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Polymerases select nucleotides before incorporating them for chemical synthesis during gene replication or transcription. How the selection proceeds stepwise efficiently to achieve sufficiently high fidelity and speed is essential for polymerase function. We examined step-by-step selections that have conformational transition rates tuned one at time in the polymerase elongation cycle, with a controlled differentiation free energy at each checkpoint. The elongation is sustained at non-equilibrium steady state with constant free energy input and heat dissipation. It is found that error reduction capability does not improve for selection checkpoints down the reaction path. Hence, it is essential to select early to achieve an efficient fidelity control. In particular, for two consecutive selections that reject the wrong substrate back and inhibit it forward from a same kinetic state, the same error rates are obtained at the same free energy differentiation. The initial screening is indispensible for maintaining the elongation speed high, as the wrong nucleotides can be removed quickly and replaced by the right nucleotides at the entry. Overall, the elongation error rate can be repeatedly reduced through multiple selection checkpoints. The study provides a theoretical framework to conduct further detailed researches, and assists engineering and redesign of related enzymes.
Ariane 6 ULPM multi boost mission development, a system multi disciplinary challenge
Creators: name:  FRANCOIS PEYRAUD
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: CRYOGENIC
UPPER STAGE

description: Ariane 6 Cryogenic Upper Liquid Propulsion Module currently under development is a real game changer thanks to the mission versatility it will offer. Based on two propulsive systems (VINCI Main engine and Auxiliary Power Unit) using liquid Hydrogen/ liquid Oxygen propellant, , it will have a capability of four Main Engine ignitions with long coasting phase in-between. The present paper will provide an overview of the definition of these specific flight phases, the encountered difficulties and the way they have been managed.
$μ$ term and supersymmetry breaking from six dimensional theory
Creators: name: Adachi, Yuki
name: Haba, Naoyuki
name: Yamashita, Toshifumi
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a new next-to-minimal supersymmetric standard model (NMSSM) which is on a six-dimensional spacetime compactified on a $T^2/Z_3$ orbifold. In this model, three gauge singlet fields $N, S_1$ and $S_2$ in addition to the minimal supersymmetric standard model (MSSM) fields are introduced. These fields are localized at some fixed points except for the singlet $N$ and the gauge fields. The $μ$ parameter is provided from the vacuum expectation value (vev) of $N$. The $F$ terms get vevs simultaneously, and the gauginos mediate the supersymmetry breaking to the MSSM sector. Both of these parameters are strongly suppressed due to the profile of $N$. Thus these parameters induced from those of the order of the so-called GUT scale can become close to the electroweak scale without unnatural fine tuning.
description: 12 pages, 1 figure
An assemblage of affective sounds: resistance and power through the Palestinian electronic music scene
Creators: name: Giaever, Maria
Publisher: name: University of Westminster
Year: 2023

description: This thesis is an exploratory, descriptive, conceptual research about the Palestinian electronic dance scene. First, it sets out to make sense of social relations and elements traversing and constituting this space, locating the scene chronologically, geographically and affectively through anecdotes, interviews and encounters in different dance floors and spaces. It explores how music, affect, class and space are bound together to produce a layered and mobile assemblage of people that relate in diverse ways to the practice of resistance. Second, this project focuses on the meanings and practices related to resistance within the scene. Departing from a critical standpoint on subcultural theory and traditional frameworks for resistance, I interrogate and amplify the meanings of resisting in this context. The idea of ‘generative resistance’ is articulated in this process and examined in terms of its production of new spaces, communities, affects, intimacies, alternatives and culture, disputing diverse power structures. This thesis uses a participant and feminist micro-ethnography. Developed between 2019- 2022, the methods employed are mainly participant and sensory observation, interviews and informal conversations, and online analysis. I conducted fieldwork in Ramallah (Palestine), Amman (Jordan), Berlin (Germany), Athens (Greece) and London (Britain). Through this process, I developed a critical ‘anti-research’ epistemology that questions my positionality and generates an ‘affective’ epistemology: a way of doing research and producing knowledge that is based on difference, discomfort, solidarity and transformation.
Design, Fabrication and Performance of Planar Solid Propellant Micro-thruster Based on SU-8 Photoresist
Creators: name:  JIANBING XU
name:   ZEHUA ZHANG
name:   FUWEI LI
name:   JIAN CHENG
name:   YINGHUA YE
name:   RUIQI SHEN
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: PLANAR SOLID PROPELLANT MICRO-THRUSTER (PSPMT)
SU-8 PHOTORESIST
MINIATURE COMBUSTION CHAMBER WITH LAVAL NOZZLE
LITHOGRAPHY PROCESS
IMPULSE

description: In order to meet the demand of small satellites for micro propulsion system, a Planar Solid Propellant Micro-thruster (PSPMt) was designed and fabricated. Using SU-8 photoresist as chamber material, a miniature combustion chamber with laval nozzle was fabricated with lithography technology. And the effects of coating, soft-bake, exposure and developing parameter on lithography result was also studied. The PSPMt was sealed with MD 130 glue and its propulsive performance was tested by a micro-impulse testing platform. The impulse of the prepared PSPMt reaches 127.9 N s and its ignition duration lasts 0.2 ms when loaded with 1.9 mg nanothermite.
The statistical distribution of magnetic field strength in G-band bright points
Creators: name: Criscuoli, Serena
name: Uitenbroek, Han
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: G-band bright points are small-sized features characterized by high photometric contrast. Theoretical investigations indicate that these features have associated magnetic field strengths between 1-2 kG. Results from observations instead lead to contradictory results, indicating magnetic fields of only kG strength in some and including hG strengths in others. In order to understand the differences between measurements reported in the literature, and to reconcile them with results from theory, we analyze the distribution of magnetic field strength of G-band bright features identified on synthetic images of the solar photosphere, and its sensitivity to observational and methodological effects. We investigate the dependence of magnetic field strength distributions of G-band bright points identified in 3D magnetohydrodynamic simulations on feature selection method, data sampling, alignment and spatial resolution. The distribution of magnetic field strength of G-band bright features shows two peaks, one at about 1.5 kG and one below 1 hG. The former corresponds to magnetic features,the second mostly to bright granules. Peaks at several hG are obtained only on spatially degraded or misalligned data. Simulations show that magnetic G-band bright points have typically associated field strengths of few kG. Field strengths in the hG range can result from observational effects, thus explaining the discrepancies presented in the literature. Our results also indicate that outcomes from spectro-polarimetric inversions with imposed unit filling-factor should be employed with great caution.
Community Economic Development under the Impact of the COVID-19 Outbreak for Sustainable Development in Kaeng Loeng Chan Subdistrict
Creators: name: Thanyachanok Pawala
Publisher: name: DR.KEN Institute of Academic Development and Promotion.
Year: 2023
Subjects: Community Economy
Sufficiency Economy Philosophy
Model Sufficiency Economy Village

description: Interdisciplinary Academic and Research Journal, 3, 3, 779-798
Importance and Techniques of Information Hiding : A Review
Creators: name: Gupta, Richa
name: Gupta, Sunny
name: Singhal, Anuradha
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Information or data is very crucial resource to us. Thus securing the information becomes all the more necessary. The communication media through which we send data does not provide data security, so other methods of securing data are required. Information hiding plays a very crucial role today. It provided methods for encrypting the information so that it becomes unreadable for any unintended user. This paper reviews the techniques that exist for data hiding and how can these be combined to provide another level of security.
description: 6 pages, 6 figures, Published with International Journal of Computer Trends and Technology (IJCTT)
Robustness analysis for closed-loop model reference adaptive attitude control for a satellite launcher
Creators: name:  JULIA GUIMARAES
name:   WALDEMAR LEITE FILHO
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: MODEL REFERENCE ADAPTIVE CONTROL
SATELLITE LAUNCHER ATTITUDE CONTROL
ROBUSTNESS ANALYSIS

description: This paper considers a closed loop reference model architecture for an adaptive control system and analyses its robustness in the presence of bounded disturbances. The traditional architecture is modified by an e-modification adaptive law and its bounded stability is proven using concepts of uniform ultimate boundedness. Furthermore, tliis work proposes a strategy for calculating the size of tlie bounded set, showing the influence of tlie CRM architecture in tlie overall robustness of tlie system. Finally, the results are applied to a satellite launcher attitude control, illustrating how different controller choices influence the robustness metrics.
Laminar shocks in high power laser plasma interactions
Creators: name: Cairns, R. A.
name: Bingham, R.
name: Norreys, P.
name: Trines, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We propose a theory to describe laminar ion sound structures in a collisionless plasma. Reflection of a small fraction of the upstream ions converts the well known ion acoustic soliton into a structure with a steep potential gradient upstream and with downstream oscillations. The theory provides a simple interpretation of results dating back more than forty years but, more importantly, is shown to provide an explanation for recent observations on laser produced plasmas relevant to inertial fusion and to ion acceleration.
description: 7 pages, 6 figures
Regolith-based Lunar Habitats - an Engineering Approach to Radiation Shielding
Creators: name:  YULIA AKISHEVA
name:   YVES GOURINAT
name:   CEDRIC DOSSAT
name:   SUSANNA GUATELLI
name:   STEVEN ROBIN-CHABANNE
name:   ATHINA VAROTSOU
name:   AIDAN COWLEY
name:   ADVENIT MAKAYA
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: REGOLITH
RADIATION PROTECTION
HABITAT

description: Sustainable human exploration of the Moon will largely rely on in-situ resource utilisation, such as using regolith in habitat construction. This paper investigates the relative effectiveness of polymer-enriched regolith as a radiation shield. Radiation-matter interactions are simulated with RayXpert software, and the dose equivalent in ICRU-sphere behind a representative wall is calculated. The primary radiation source is Galactic Cosmic Ray protons. Secondary emissions are studied, with main focus on neutrons and protons. This work provides quantitative insight into how much polymer is required to claim a significant improvement in terms of radiation protection when compared to a bare regolith wall. proposes sintering techniques using polymer binders to make regolith bricks that can be arranged to make habitats [5][ IO]. Same literature often highlights the added radiation protection due to polymers\' richness in hydrogen. However, to the authors\' knowledge, no comprehensive study using Monte Carlo tools and calculating the dose equivalent in the human body has been performed. This paper presents the results of such a study. We calculate the dose equivalent in the ICRU-sphere behind a representative habitat wall. In the first part of the study, the wall is mainly made ofregolith and is successively enriched with a polymer binder. In the second part, the polymer is instead added as a layer, behind the bare regolith wall. The primary radiation source is Galactic Cosmic Ray (GCR) protons. Secondary emissions are studied, with main focus on neutron and proton production. This work provides quantitative insight into how much polymer is required to claim a significant improvement in terms of radiation protection when compared to a bare regolith wall. From the engineering point of view, simple yet effective solutions can be achieved with cost-effective
The theory of the rise of sap in trees: some historical and conceptual remarks
Creators: name: Brown, Harvey R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: The ability of trees to suck water from roots to leaves, sometimes to heights of over a hundred meters, is remarkable given the absence of any mechanical pump. This study deals with a number of issues, of both an historical and conceptual nature, in the orthodox Cohesion Tension theory of the ascent of sap in trees. The theory relies chiefly on the exceptional cohesive and adhesive properties of water, the structural properties of trees, and the role of evaporation (transpiration) from leaves. But it is not the whole story. Plant scientists have been aware since the inception of the theory in the late 19th century that further processes are at work in order to prime the trees, the main such process (growth itself) being so obvious to them that it is often omitted from the story. Other factors depend largely on the type of tree, and are not always fully understood. For physicists, in particular, it may be helpful to see the fuller picture, which is what this study attempts to provide in nontechnical terms.
description: An updated version of published paper, with corrections and additions
Helicopter main rotor blade structure parametric optimization using graphic programming language
Creators: name:  JAKUB KOCJAN
name:   STANISLAW KACHEL
name:   ROBERT ROGOLSKI
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: HELICOPTER
MAIN ROTOR
ROTOR BLADE
GEOMETRIC MODELLING
OPTIMISATION
CFD

description: This work presents the method of preliminary structure optimization of main rotor blade using parametric modelling. As a basis for parametric blade structure calculations the analytical model is provided in this paper. The equations of rigid blade loads and bending moment loads are shown. The parametric modelling is conducted using GRIP (Graphic Integrated Programming) language. The structure of blade is generated automatically. The code inbuilt analysis systems provides a inertia examination of the geometry. The program for calculating the blade loads and natural mode shapes and vibration is presented. The code works in the loop, where at the end the generated geometry is a proposal of structure with optimal dimensions for the possible lowest mass. As an output of the study, the alternatives for main rotor optimization are developed.
Modelisation of plasma discharge for aerospace applications : Streamer to arc transition
Creators: name:  EVE PACHOUD
name:   FABIEN THOLIN
name:   ANNE BOURDON
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: MODELISATION
PLASMA DISCHARGE
STREAMER DISCHARGES
ELECTRIC ARCS

description: Streamer and electric arc discharges play a very important role in many aerospace applications. The formers are related to many safety issues during lightning stroke to aircraft [ 1] and streamer discharges are involved in the triggering phase of electric arcs [ 4]. MHD (Magneto-Hydro-Dynamics) models have been successfully used to simulate electric arcs [7], but they cannot model non-neutral streamer discharges [8] that are usually modelled by non-neutral multi-fluid drift diffusion approaches [9]. However, streamer models require timesteps and cell sizes decreasing dramatically as the plasma transits to an arc. The goal of this work is to propose an innovative numerical scheme, based on recent discretization technics called AP (Asymptotic Preserving) that could make it possible to unify streamer and arc models consistently [10-11].
بررسی افسانه ها ،قصه ها و متل های کردی ایلامی از دیدگاه گریماس
Publisher: name: دانشگاه کردستان
Year: 2022

description: ادبیات شفاهی بخشی از فولکلور است که میراث سنت های داستانی و غیر داستان مردمان گذشته است .ایلامیان به عنوان بخشی ازمردم کُرد ، با تمدنی کهن وگنجینه ای از فرهنگ بکرشفاهی دارای متل ها وقصه های دیرینه است که مدتی است ثبت آنها مورد توجه محققان و پژوهشگران حوزه ادب عامه قرار گرفته است. امروزه نقدهای زیادی وجود دارد که بر کارکردهای ساختاری استوارند. ساختارگرایان همواره در پی آن بودند که به الگوهایی دست یابند تا به کمک آنها، قصه ها را مورد بررسی قرار دهند. هدف از این پژوهش، بررسی افسانه ها، داستان‎ها ومتل های کردی ایلام براساس نظریهءگریماس است. به دلیل فقدان مطالعه علمی و لزوم بررسی ساختاری و شهرت زیاد این نظریه، کوشیده شده به این سوال اصلی پاسخ داده شود، بازنمود بررسی افسانه ها، قصه ها ومتل های ایلامی بر اساس نظریه گریماس چگونه است؟برای رسیدن به پاسخ سؤالات، با روش کتابخانه ای 127 متل از 5 کتاب انتخاب شده اند و سپس با الگوی تقابل های دوگانه و زنجیره های سه گانه گریماس ارزیابی گردیده است. نتیجه این بررسی نشان دهندۀ وجود شش کنشگر در متل ها است. از نظر حضور و عدم حضور شخصیت ها، سیزده گروه را می توان مشخص کرد .در بعضی از قصه ها، یک یا چند کنشگر غایبند که فرستنده بیشترین بسامد را از این نظر دارد. دردسته بندی انواع شخصیت ها مردان بیشترین کاربرد ومخلوقات کمترین کاربرد را دارند .زنجیره های روایی گریماس نیز در همه متل ها دیده می شوند
بررسی، تحلیل و دسته بندی بن مایه های دعا و نفرین در فرهنگ و ادب عامۀ کلهری
Publisher: name: دانشگاه کردستان
Year: 2022

description: مطالعه در فرهنگ و ادب عامه و بررسی سویه های مختلف اعتقادی، تاریخی و ادبی آن منجر به شناخت بیشتر از چگونگی شکل گیری نوع نگرش و سیر تحول فکری و اجتماعی جوامع است. از مهم ترین سویه های اعتقادی در فرهنگ و ادب عامه، موضوع دعا و نفرین  است. دعا و نفرین  در فرهنگ و ادب عامۀ کلهری نمود و کاربرد فراوانی دارد. پژوهش حاضر برآن  است با استفاده از رویکرد مصاحبه و روش تحلیلی- توصیفی به بررسی گزاره های زبانی دعا و نفرین در گویش کلهری بپردازد. مهمترین هدف پژوهش حاضر یافتن پاسخ های اقناعی برای سؤالات پژوهش می باشد، که عبارتند از: 1- دعا و نفرین چه جایگاهی در نوع نگرش کردهای کلهر دارد؟ 2- این دعا و نفرین ها ریشه در کدام بخش از فرهنگ دیرینۀ کلهری دارند. 3- شأن بیان این دعا و نفرین ها چیست؟ از مهمترین یافته های پژوهش آن است که گویشوران کلهری اغلب به دعا و نفرین و عواقب آن معتقدند. بن مایه های دعا و نفرین  در گزاره های فرهنگ کلهری در سه مقولۀ باورهای دینی، روابط و مناسبات اجتماعی و مضامین تاریخی جای  دارند. بالاترین بسامد از آن بن مایه های دینی و کمترین فراوانی مربوط به بن مایه های تاریخی است. همچنین بسامد دعا و نفرین های حاصل از مناسبات اجتماعی  در مرتبۀ دوم است
بررسی تطبیقی تجلی جمال محبوب در دیوان ابن فارض و ملای جزیری
Publisher: name: دانشگاه کردستان
Year: 2022

description: یکی از مباحث مهم و قابل توجّه در عرفان اسلامی، مبحث تجلّی است. به گونه ای که شعرای اهل عرفان و تصوف در اکثر دیوان اشعار خود به صورت گسترده به موضوع حسن و جمال محبوب پرداخته اند. دیوان شاعر عارف عرب زبان، ابن فارض (576-632 ق) و مُلای جزیری کُرد (975- 1050ق)، سرشار از تجلّی جمال محبوب است و نام آنان در حوزۀ عرفان و تصوف در کنار نام کسانی همچون شیخ شهاب الدین سهروردی، ابن عربی، صدرالدین قونوی، مولوی بلخی و مولانا خالد شهرزوری جای گرفته است و اشعار آنان که مزین به موضوع زیبایی بودند، در حلقه های ذکر صوفیه سروده می شده اند. در این مقاله دیوان اشعار این دو شاعر عارف، با تکیه بر زیبایی جمال محبوب، به روش توصیفی-تحلیلی مورد بررسی قرار گرفته است. نتایج تحقیق نشان می دهد که اشعار هر دو شاعر وجه تشابه فراوانی به هم دارند. این تشابهات بیان می دارند که موضوع حسن و جمال در هر زمان و به هر زبان، از حیث محتوی و شیوۀ بیان، از یک سرچشمۀ فکری و فطری جاری شده است.
بررسی سبکی دیوان ملامنوچهر کولیوند
Publisher: name: دانشگاه کردستان
Year: 2022

description: ملامنوچهر کولیوند از شاعران لک است که زبانی نزدیک به زبان فارسی دارد. وی در زمان قاجار زندگی می  کرده است. هدف این پژوهش آن است که با روش توصیفی-تحلیلی اشعار ملامنوچهر را بر اساس سطوح سبک  شناسی مورد بررسی قرار دهیم. پس از بررسی اشعار وی، به این نتایج دست یافتیم: 1- سطح زبانی: الف) سطح آوایی: ملامنوچهر از وزن های عروضی به جای هجایی استفاده کرده و قافیه های عربی، فارسی و لکی را به کار برده است. ردیف های شعر او بیشتر لکی است. انواعی از جناس، سجع و واج آرایی در شعر او دیده می شود. ب) سطح لغوی: گاهی ملامنوچهر واج «ه، ت، ب» پایانی و «د» میانی و پایانی را از واژه ها حذف می کند. تبدیل واج «ز» به «ژ» که در لکی رایج است، در دیوان ملا نیز وجود دارد. واژه های کهن لکی که اکنون کاربرد کمی دارند در دیوان وی دیده می شوند. وی واژه های عربی را نسبتاً زیاد به کار برده است. تعداد کمی واژۀ ترکی و نیز واژه های کهن فارسی در دیوان ملا وجود دارد. ج) سطح نحوی: ملامنوچهر فعل های لکی را بیش از فعل های دیگر زبان ها به کار برده است. وی از برابرنهادهای لکی «این» و «آن» و ضمیر اول شخص لکی استفاده کرده است. 2- سطح ادبی: تشبیه، مجاز، کنایه، استعاره، تلمیح، تضمین، مراعات نظیر، اغراق، تضاد و تنسیق الصفات نیز در دیوان ملامنوچهر دیده می شود. 3- سطح فکری: مضامین شعر ملا، وصف پیری، ستایش، توصیف بهار، ساقی نامه، شادی گرایی و توصیف طبیعت است
Supplementary document for Refractive index measurement of IP-S and IP-Dip photoresists at THz frequencies and validation via 3D photonic metamaterials made by direct laser writing - 6515415.pdf
Creators: name: Mavrona, Elena
name: Theodosi, Anna
name: Mackosz, Krzysztof
name: Perivolari, Eleni
name: Utke, Ivo
name: Michler, Johann
name: Schwiedrzik, Jakob
name: Kafesaki, Maria
name: Tsilipakos, Odysseas
name: Xomalis, Angelos
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Supplementary material
تحلیل زبان عرفانی در دیوان محوی
Publisher: name: دانشگاه کردستان
Year: 2022

description: شعر عرفانی از طریق زبانی ویژه و ساختاری استوار در صورت و معنا پدید می آید و دقت در آن، میزان موفقیت شاعر را در دسترسیِ خلاقانه به ساحت آن تعیین می کند. محوی شاعر بلند آوازة کُرد در سروده های خویش از مضامینِ عرفانی بهره می برد، تا صور خیال شاعرانة خود را بیافریند و یافته های معنوی خویش را به گونه ای هنری ارائه  دهد. هدف اصلی پژوهش حاضر، تحلیلِ اشعار محوی از منظر خلق مفاهیم عرفانی، توسع مفاهیم صوفیانه برای مضمون آفرینی از طریق زبان عرفانی و میزان خلاقیت شاعر در ورود به عرصة زیبایی شناسیِ شعر صوفیانه است. پژوهش حاضر به روش تحلیلی و با توجه به برخی مبانیِ نقد و نظریه به ارزیابیِ فرم و محتوای تعدادی از برجسته ترین تصاویر شعری در اشعار عرفانیِ محوی پرداخته است. نتایج نشان می دهد شاعر در بیان معانی و مفاهیمِ اشعار خویش با تأکید بر نمادپردازی، درک کاملی از مضامین عارفانه و قلمرو شعر صوفیانه دارد و با استفاده از آموزه های خویش، تصویرهای بدیعی در اشعار عرفانی خود آفریده است؛ اما به سبب ناتوانی در کاربرد قابلیت های زبانِ عرفان و عدم ورود به این عرصه قادر به خلقِ نمادهای ویژة خویش نیست و رمزوارگیِ کلماتِ او اغلب در حوزة استعاره می ماند؛ اما در عرصة شکل و فرم، نوآوری ها و خلاقیت هایی در غزلیات کُردی دارد که قابل توجه می نماید. در این پژوهش رابطة زبان و اندیشة وی در این زمینه بر رسی می شود. در کلیتِ دیوان محوی، وجوه زبانی و معنویِ دریافت های عارفانة وی کمتر به فضای بی کرانِ نمادآفرینی برای خلقِ تجارب عرفانی می پیوندد
تحلیل گفتمان قدرت، جایگاه سوژه و هویت در رمان حصار و سگهای پدرم
Publisher: name: دانشگاه کردستان
Year: 2022

description: تحلیل گفتمان ادبی، به تحلیل داده ­های زبانی و فرازبانی متن ادبی برای رسیدن به مفاهیم و تعابیر متفاوت از آن گفته می­شود. این پژوهش به شیوۀ توصیفی–تحلیلی به بررسی و تحلیل رمان حصار و سگ­های پدرم از منظر تحلیل گفتمان حاکم بر آن­ پرداخته است. ضرورت انجام این پژوهش در آن است که نشان می­دهد متن ادبی تنها داده ­های زبانی و زیبایی ­شناسانه نیست و می­توان از رهگذر داده ­های زبانی و فرازبانی، تعابیر و برداشت­های متفاوتی از آن به دست داد. این داستان را از لحاظ گفتمان می­توان در سه بخش دسته­ بندی کرد: گفتمان غالب، گفتمان تازه و نافرجامی گفتمان تازه. گفتمان قدرت با تک­صدا کردن زبان و جامعه و سرکوب گفتگو و دیگر ارتباطات، در جهت گسترش قدرت و تثبیت هرچه بیشتر آن گام می­نهد که خود در ساخت جامعه و سوژه ­های همگون تأثیر فراوانی دارد. در نهایت، از آن­جا که هیچ گفتمانی نمی­تواند به تمامی خود را تثبیت کند، در تقابل با گفتمان غالب، گفتمانی تازه سر برمی­آورد که شخصیت اول داستان آن را نمایندگی می­کند. با تولید گفتمان تازه که یکی از ملزومات آن هویت تازه است، سوژه، هویت تازه­ای پیدا می­کند و به تدریج گفتمان پیشین به حاشیه می­رود؛ اما در نهایت گفتمان تازه راه به جایی نمی­برد
شهرگریزی در اندیشۀ شعری سواره ایلخانی زاده و احمد عبدالمعطی حجازی
Publisher: name: دانشگاه کردستان
Year: 2022

description: سواره ایلخانی زاده شاعر بلندآوازۀ کُرد و احمد عبدالمعطی حجازی شاعر مشهور عرب (مصری) از شعرای معاصر در قرن بیستم هستند که در اشعارشان، زمزمۀ نکوهش زندگی شهریِ آمیخته با صنعت و مدرنیته و گرایش به زندگی بی­ آلایش روستایی به گوش می­رسد، چندان­که شهرگریزی یکی از ویژگی­های برجستۀ سروده­های این دو شاعر است. از آن روی که تاکنون جستار مستقلّی به تحلیل تطبیقی پدیدۀ شهرگریزی در شعر سواره و حجازی نپرداخته است، لذا نگارندگان در پژوهش حاضر برآنند تا به بررسی تطبیقی شهرهراسی در سروده ­های دو شاعر بپردازند. مسألۀ بنیادین پژوهش حاضر این است که پدیدۀ شهرگریزی، چگونه و در چه قال ب­هایی در سروده ­های دو شاعر نمود یافته و با چه مفاهیم و مضامین شعری­ای پیوند خورده است؟ در راستای بررسی این مسأله، نگارندگان از بُن­مایه­های مکتب ادبیات تطبیقی آمریکایی و رویکرد توصیفی-تحلیلی مبتنی بر بررسی درون­مایۀ سروده ­های دو شاعر بهره گرفته­­ اند. ابراز تنفّر از نمادهای صنعت و مدرنیته، دلزدگی از فضای آلوده و عناصر و اِلمان­های شهری، احساس پژمردگی و دلتنگی، بی­رحمی و روابط اجتماعی سرد، روی برتافتن از شهر و گرایش بازگشت به روستا از پُربسامدترین نمودهای شهرگریزی در سروده ­های دو شاعر است. حجم شهرسروده ­های حجازی و پردازش جنبه ­های گونه­ گون شهرگریزی در اشعار وی، بسیار بیشتر از شهرسروده ­های سواره است. امّا دغدغۀ شهرگریزی در تصاویر شعری سواره بیشتر معطوف به آمیزش با جلوۀ اسطوره­ای و رازآلود طبیعت و غرق شدن در زمزمۀ زلال سنگریزه ­های چشمه­ ساران است