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Academic literature on the topic 'Contributions in space and time'

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Published: 26 July 2024

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Journal articles on the topic "Contributions in space and time"

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Dépeault, Alexandra, El-Mehdi Meftah, and C. Elaine Chapman. "Tactile Speed Scaling: Contributions of Time and Space." Journal of Neurophysiology 99, no. 3 (March 2008): 1422–34. http://dx.doi.org/10.1152/jn.01209.2007.

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A major challenge for the brain is to extract precise information about the attributes of tactile stimuli from signals that co-vary with multiple parameters, e.g., speed and texture in the case of scanning movements. We determined the ability of humans to estimate the tangential speed of surfaces moved under the stationary fingertip and the extent to which the physical characteristics of the surfaces modify speed perception. Scanning speed ranged from 33 to 110 mm/s (duration of motion constant). Subjects could scale tactile scanning speed, but surface structure was essential because the subjects were poor at scaling the speed of a moving smooth surface. For textured surfaces, subjective magnitude estimates increased linearly across the range of speeds tested. The spatial characteristics of the surfaces influenced speed perception, with the roughest surface (8 mm spatial period, SP) being perceived as moving 15% slower than the smoother, textured surfaces (2–3 mm SP). Neither dot disposition (periodic, non periodic) nor dot density contributed to the results, suggesting that the critical factor was dot spacing in the direction of the scan. A single monotonic relation between subjective speed and temporal frequency (speed/SP) was obtained when the ratings were normalized for SP. This provides clear predictions for identifying those cortical neurons that play a critical role in tactile motion perception and the underlying neuronal code. Finally, the results were consistent with observations in the visual system (decreased subjective speed with a decrease in spatial frequency, 1/SP), suggesting that stimulus motion is processed similarly in both sensory systems.
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Steib, Imola, Sándor Nagy, and János Polonyi. "Renormalization in Minkowski space–time." International Journal of Modern Physics A 36, no. 05 (February 20, 2021): 2150031. http://dx.doi.org/10.1142/s0217751x21500317.

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The multiplicative and the functional renormalization group methods are applied for the four-dimensional scalar theory in Minkowski space–time. It is argued that the appropriate choice of the subtraction point is more important in Minkowski than in Euclidean space–time. The parameters of the cutoff theory, defined by a subtraction point in the quasi-particle domain, are complex due to the mass-shell contributions and the renormalization group flow becomes much more involved than its Euclidean counterpart.
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Metaxas, Dimitrios. "Instanton interaction in de Sitter space–time." International Journal of Modern Physics A 33, no. 33 (November 30, 2018): 1850200. http://dx.doi.org/10.1142/s0217751x18502007.

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Because of the presence of a cosmological horizon, the dilute instanton gas approximation used for the derivation of the Coleman–De Luccia tunneling rate in de Sitter space–time receives additional contributions due to the finite instanton separation. Here, I calculate the first corrections to the vacuum decay rate that arise from this effect and depend on the parameters of the theory and the cosmological constant of the background space–time.
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Kirshenbaum, Nurit, Kylie Davidson, Jesse Harden, Chris North, Dylan Kobayashi, Ryan Theriot, Roderick S. Tabalba, et al. "Traces of Time through Space." Proceedings of the ACM on Human-Computer Interaction 5, ISS (November 3, 2021): 1–20. http://dx.doi.org/10.1145/3488552.

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Technology have long been a partner of workplace meeting facilitation. The recent outbreak of COVID-19 and the cautionary measures to reduce its spread have made it more prevalent than ever before in the form of online-meetings. In this paper, we recount our experiences during weekly meetings in three modalities: using SAGE2 - a collaborative sharing software designed for large displays - for co-located meetings, using a conventional projector for co-located meetings, and using the Zoom video-conferencing tool for distributed meetings. We view these meetings through the lens of effective meeting attributes and share ethnographic observations and attitudinal survey conducted in our research lab. We discuss patterns of content sharing, either sequential, parallel, or semi-parallel, and the potential advantages of creating complex canvases of content. We see how the SAGE2 tool affords parallel content sharing to create complex canvases, which represent queues of ideas and contributions (past, present, and future) using the space on a large display to suggest the progression of time through the meeting.
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Polt, Richard. "Evoking the Momentous Site: Time-Space in the Contributions to Philosophy." Heidegger Circle Proceedings 37 (2003): 16–35. http://dx.doi.org/10.5840/heideggercircle2003372.

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Fabbri, Marco, Nicola Cellini, Monica Martoni, Lorenzo Tonetti, and Vincenzo Natale. "The Mechanisms of Space-Time Association: Comparing Motor and Perceptual Contributions in Time Reproduction." Cognitive Science 37, no. 7 (April 30, 2013): 1228–50. http://dx.doi.org/10.1111/cogs.12038.

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Milliken, Bruce, Juan Lupiáñez, Martha Roberts, and Biljana Stevanovski. "Orienting in space and time: Joint contributions to exogenous spatial cuing effects." Psychonomic Bulletin & Review 10, no. 4 (December 2003): 877–83. http://dx.doi.org/10.3758/bf03196547.

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De Bièvre, Dirk, Patricia Garcia-Duran, Leif Johan Eliasson, and Oriol Costa. "Editorial: Politicization of EU Trade Policy Across Time and Space." Politics and Governance 8, no. 1 (March 31, 2020): 239–42. http://dx.doi.org/10.17645/pag.v8i1.3055.

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This editorial provides an introduction to the thematic issue “Politicization of EU Trade Policy Across Time and Space.” The academic editors place the issue in the context of the current literature, introduce the contributions, and discuss how the articles, individually and jointly, add to the state of the art.
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POULIS, F. P., and J. M. SALIM. "WEYL GEOMETRY AS CHARACTERIZATION OF SPACE-TIME." International Journal of Modern Physics: Conference Series 03 (January 2011): 87–97. http://dx.doi.org/10.1142/s2010194511001176.

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Motivated by an axiomatic approach to characterize space-time it is investigated a reformulation of Einstein's gravity where the pseudo-riemannian geometry is substituted by a Weyl one. It is presented the main properties of the Weyl geometry and it is shown that it gives extra contributions to the trajectories of test particles, serving as one more motivation to study general relativity in Weyl geometry. It is introduced its variational formalism and it is established the coupling with other physical fields in such a way that the theory acquires a gauge symmetry for the geometrical fields. It is shown that this symmetry is still present for the red-shift and it is concluded that for cosmological models it opens the possibility that observations can be fully described by the new geometrical scalar field. It is concluded then that this reformulation, although representing a theoretical advance, still needs a complete description of their objects.
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FODA, OMAR. "MOMENTUM-SUBTRACTION RENORMALIZATION TECHNIQUES IN CURVED SPACE-TIME." International Journal of Modern Physics A 02, no. 05 (October 1987): 1549–65. http://dx.doi.org/10.1142/s0217751x87000818.

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Momentum-subtraction techniques, specifically BPHZ and Zimmermann’s Normal Product algorithm, are introduced as useful tools in the study of quantum field theories in the presence of background fields. In a model of a self-interacting massive scalar field, conformally coupled to a general asymptotically-flat curved space-time with a trivial topology, momentum-subtractions are shown to respect invariance under general coordinate transformations. As an illustration, general expressions for the trace anomalies are derived, and checked by explicit evaluation of the purely gravitational contributions in the free field theory limit. Furthermore, the trace of the renormalized energy-momentum tensor is shown to vanish at the Gell-Mann Low eigenvalue as it should.
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Dissertations / Theses on the topic "Contributions in space and time"

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FERREIRA, ALINE DE OLIVEIRA. "CONTRIBUTIONS TO ARRAY SIGNAL PROCESSING: SPACE AND SPACE-TIME REDUCED-RANK PROCESSING AND RADAR-EMBEDDED COMMUNICATIONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=30563@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Processamento em arranjos de sensores é uma área com vasta aplicação, tanto civil quanto militar, por exemplo em sonar, radar, sismologia e comunicações sem fio. Por meio de processamento espacial e espácio-temporal é possível melhorar suas funcionalidades e explorar novas possibilidades. Esta área vem atraindo cada vez mais a atenção e os esfor¸cos da comunidade científica, especialmente agora, em que antenas phased-array se estabeleceram como uma tecnologia comercial e madura. Neste contexto, nós tratamos o problema de processamento com posto reduzido em processamento espacial (beamforming) e espácio-temporal de sinais radar e a nova área de radares com função dual de radar e comunicações (dualfunction radar-communications, DFRC), que pode ser resumida na incorporação de mensagens de comunicações nas transmissıes radar como uma tarefa secundária. Nesta tese, nós investigamos a aplicação de um novo esquema de reduções de posto baseado em interpolação e decimação em duas áreas distintas: processamento espacial e processamento espácio-temporal de sinais radar. Este algoritmo para redução de posto nunca havia sido testado nestes ambientes antes e apresentou resultados bastante expressivos. Nós também propomos simplificações para reduzir a complexidade computacional do algoritmo em bemforming. Quanto ao tópico de DFRC, nós propomos dois métodos originais para incorporar modulação de amplitude/fase aos lóbulos laterais do diagrama de irradiação do radar de forma robusta. Os métodos propostos são muito mais simples do que o estado-da-arte e apresentam desempenho superior em termos de robustez e aplicabilidade em operações de tempo-real. Nós ainda provemos várias outras análises, comparações e contribuições a esta nova área.
Array processing is an area with many civilian and military applications, e.g. sonar, radar, seismology and wireless communications. By means of space and space-time processing it is possible to enhance their features and explore new possibilities. This area has been attracting increasingly more attention and gathering more efforts of the science community, especially now, that phased array antennas are established as a commercial and mature technology. Within this context, we address the problem of reduced rank processing in space and space-time radar signal processing and the new area of dual-function radar-communications (DFRC), which may be summarized as embedding communication messages into radar emissions as a secondary task for the radar. In this thesis, we investigate the application of a new joint interpolation and decimation rank reducing scheme in two different areas: beamforming and space-time radar processing. This rank reducing algorithm was never tested within these contexts before and shows impressive results. We also propose simplifications for decreasing the computational complexity of the algorithm in beamforming. In the topic of DFRC, we propose two original robust radar-embedded sidelobe phase/amplitude modulation methods which have simple closed form equations. The proposed methods are much simpler than the state of the art and have superior performance in terms of robustness and real-time applicability.
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Schoenig, Gregory Neumann. "Contributions to Robust Adaptive Signal Processing with Application to Space-Time Adaptive Radar." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/26972.

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Classical adaptive signal processors typically utilize assumptions in their derivation. The presence of adequate Gaussian and independent and identically distributed (i.i.d.) input data are central among such assumptions. However, classical processors have a tendency to suffer a degradation in performance when assumptions like these are violated. Worse yet, such degradation is not guaranteed to be proportional to the level of deviation from the assumptions. This dissertation proposes new signal processing algorithms based on aspects of modern robustness theory, including methods to enable adaptivity of presently non-adaptive robust approaches. The contributions presented are the result of research performed jointly in two disciplines, namely robustness theory and adaptive signal process- ing. This joint consideration of robustness and adaptivity enables improved performance in assumption-violating scenarios â scenarios in which classical adaptive signal processors fail. Three contributions are central to this dissertation. First, a new adaptive diagnostic tool for high-dimension data is developed and shown robust in problematic contamination. Second, a robust data-pre-whitening method is presented based on the new diagnostic tool. Finally, a new suppression-based robust estimator is developed for use with complex-valued adaptive signal processing data. To exercise the proposals and compare their performance to state- of-the art methods, data sets commonly used in statistics as well as Space-Time Adaptive Processing (STAP) radar data, both real and simulated, are processed, and performance is subsequently computed and displayed. The new algorithms are shown to outperform their state-of-the-art counterparts from both a signal-to-interference plus noise ratio (SINR) conver- gence rate and target detection perspective.
Ph. D.
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Baba, Ibrahim El. "Contributions numériques en compatibilité électromagnétique impulsionnelle. Paradigme pour la caractérisation temporelle d'équipements." Thesis, Clermont-Ferrand 2, 2012. http://www.theses.fr/2012CLF22232/document.

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Le travail présenté dans cette thèse concerne la mise en oeuvre numérique de techniques temporelles pour des applications en compatibilité électromagnétique (CEM) impulsionnelle, essentiellement pour des études en chambre réverbérante à brassage de modes (CRBM). Prenant le contre-pied des approches fréquentielles, adaptées par nature aux études de cavités résonantes, l’idée directrice de ce mémoire a été d’étudier des moyens temporels originaux d’investigation de CRBM en vue de proposer de nouveaux paradigmes pour la caractérisation d’équipements. Originellement développé en acoustique, le processus de retournement temporel (RT) récemment appliqué aux ondes électromagnétiques permet une focalisation spatiale et temporelle de ces dernières d’autant meilleur que le milieu de propagation est réverbérant. Les chambres réverbérantes (CR) sont ainsi des endroits idéaux pour l’application du processus de RT. Après une nécessaire étude des nombreux paramètres qui gouvernent ce dernier couplée à la définition de méthodologies numériques spécifiques, les applications du RT en CRBM sont exposées. En particulier, l’intérêt d’une focalisation sélective pour des tests en susceptibilité rayonnée est démontré. L’importance des coefficients d’absorption et de diffraction des équipements en CRBM justifie leur caractérisation précise et efficace. À cette fin, la mise en oeuvre d’un calcul temporel de section efficace totale de diffraction (TSCS en anglais) est détaillée. L’application de cette nouvelle technique à différentes formes de brasseurs de modes permet au final de confronter ces résultats avec ceux obtenus à l’aide de tests normatifs CEM
The work presented in this thesis concerns the use of time techniques for impulsive ElectroMagnetic Compatibility (EMC) applications, mainly for Modes Stirred Reverberation Chamber (MSRC) studies. Contrary to approaches from frequency domain, obviously well-fitted for studies in resonant cavities, the main idea of this thesis was to study an original time method for MSRC investigation to propose new paradigms for equipment characterization. Originally developed in acoustics, the Time Reversal (TR) process recently applied to electromagnetic waves allows focusing it both in time and space. The process quality is even higher if the propagation environment is reverberant. Thus, the Reverberation Chambers (RC) are an ideal locations for TR implementation. After a study of parameters involved in the TR process coupled with the definition of specific numerical methods, the applications of TR in MSRC are exposed. In particular, the interest of selective focusing for radiated susceptibility tests is demonstrated. The importance of absorption and diffraction coefficients for MSRC equipment justifies their accurate and efficient characterization. To this end, the implementation of a temporal calculation of the Total Scattering Cross Section (TSCS) in RC is detailed. The application of this new technique to different forms of stirrers allows finally to face these results with those obtained from standard EMC test
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Demir, Serhat. "Diffusion of Police Technology across Time and Space and the Impact of Technology Use on Police Effectiveness and Its Contribution to Decision-Making." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1238602124.

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Guyot, Maxime. "Neutronics and thermal-hydraulics coupling : some contributions toward an improved methodology to simulate the initiating phase of a severe accident in a sodium fast reactor." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4345.

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Le sujet de la thèse s'inscrit dans le cadre de la rénovation des outils et des méthodes de calculs appliqués aux accidents graves des Réacteurs à Neutrons Rapides refroidis au Sodium (RNR-Na). En particulier, on s'intéresse aux biais et conservatismes liés à la méthodologie de calculs de la phase primaire d'un accident grave. Pour évaluer les conséquences d'un accident de fusion du coeur d'un RNR-Na, une approche déterministe est généralement réalisée en considérant des hypothèses dites "best-estimate". Cette approche repose sur l'utilisation de codes informatiques pour simuler numériquement le comportement du coeur en conditions accidentelles.La phase primaire de dégradation concerne les évènements se produisant tant que les boîtiers inter-assemblages sont intègres. Les assemblages combustibles conservent alors une indépendance les uns par rapport aux autres. Pour cette raison, la simulation de la phase primaire repose sur une approche multi-canaux. Cette approche consiste à regrouper les assemblages semblables en classes d'assemblages appelés canaux. Le modèle thermo-hydraulique en canaux est couplé à un calcul neutronique pour évaluer le niveau de puissance et de réactivité au cours du transitoire accidentel. La méthodologie de calcul de la phase primaire d'un accident grave repose sur des hypothèses fortes en termes de modélisation neutronique et thermo-hydraulique. Après avoir identifié les principales sources d'erreur, la thèse a consisté à développer un nouvel outil de calcul pour la phase primaire en vue d'évaluer les biais et conservatismes méthodologiques
This project is dedicated to the analysis and the quantification of bias corresponding to the computational methodology for simulating the initiating phase of severe accidents on Sodium Fast Reactors. A deterministic approach is carried out to assess the consequences of a severe accident by adopting best estimate design evaluations. An objective of this deterministic approach is to provide guidance to mitigate severe accident developments and recriticalities through the implementation of adequate design measures. These studies are generally based on modern simulation techniques to test and verify a given design. The new approach developed in this project aims to improve the safety assessment of Sodium Fast Reactors by decreasing the bias related to the deterministic analysis of severe accident scenarios.During the initiating phase, the subassembly wrapper tubes keep their mechanical integrity. Material disruption and dispersal is primarily one-dimensional. For this reason, evaluation methodology for the initiating phase relies on a multiple-channel approach. Typically a channel represents an average pin in a subassembly or a group of similar subassemblies. Inthe multiple-channel approach, the core thermal-hydraulics model is composed of 1 or 2 D channels. The thermal-hydraulics model is coupled to a neutronics module to provide an estimate of the reactor power level.In this project, a new computational model has been developed to extend the initiating phase modeling. This new model is based on a multi-physics coupling. This model has been applied to obtain information unavailable up to now in regards to neutronics and thermal-hydraulics models and their coupling
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Bouchiba, Hassan. "Contributions en traitements basés points pour le rendu et la simulation en mécanique des fluides." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM076/document.

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Le nuage de points 3D est la donnée obtenue par la majorité des méthodes de numérisation surfacique actuelles. Nous nous intéressons ainsi dans cette thèse à l'utilisation de nuages de points comme unique représentation explicite de surface. Cette thèse présente deux contributions en traitements basés points. La première contribution proposée est une nouvelle méthode de rendu de nuages de points bruts et massifs par opérateurs pyramidaux en espace image. Cette nouvelle méthode s'applique aussi bien à des nuages de points d'objets scannés, que de scènes complexes. La succession d'opérateurs en espace image permet alors de reconstruire en temps réel une surface et d'en estimer des normales, ce qui permet par la suite d'en obtenir un rendu par ombrage. De plus, l'utilisation d'opérateurs pyramidaux en espace image permet d'atteindre des fréquences d'affichage plus élevées d'un ordre de grandeur que l'état de l'art .La deuxième contribution présentée est une nouvelle méthode de simulation numérique en mécanique des fluides en volumes immergés par reconstruction implicite étendue. La méthode proposée se base sur une nouvelle définition de surface implicite par moindres carrés glissants étendue à partir d'un nuage de points. Cette surface est alors utilisée pour définir les conditions aux limites d'un solveur Navier-Stokes par éléments finis en volumes immergés, qui est utilisé pour simuler un écoulement fluide autour de l'objet représenté par le nuage de points. Le solveur est interfacé à un mailleur adaptatif anisotrope qui permet de capturer simultanément la géométrie du nuage de points et l'écoulement à chaque pas de temps de la simulation
Most surface 3D scanning techniques produce 3D point clouds. This thesis tackles the problem of using points as only explicit surface representation. It presents two contributions in point-based processing. The first contribution is a new raw and massive point cloud screen-space rendering algorithm. This new method can be applied to a wide variety of data from small objects to complex scenes. A sequence of screen-space pyramidal operators is used to reconstruct in real-time a surface and estimate its normals, which are later used to perform deferred shading. In addition, the use of pyramidal operators allows to achieve framerate one order of magnitude higher than state of the art methods. The second proposed contribution is a new immersed boundary computational fluid dynamics method by extended implicit surface reconstruction. The proposed method is based on a new implicit surface definition from a point cloud by extended moving least squares. This surface is then used to define the boundary conditions of a finite-elements immersed boundary transient Navier-Stokes solver, which is used to compute flows around the object sampled by the point cloud. The solver is interfaced with an anisotropic and adaptive meshing algorithm which refines the computational grid around both the geometry defined by point cloud and the flow at each timestep of the simulation
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Oswald, Michael. "New contributions to space debris environment modeling." Aachen Shaker, 2008. http://d-nb.info/988549123/04.

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Karacayir, Murat. "Space-time Codes." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612028/index.pdf.

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The phenomenon of fading constitutes a fundamental problem in wireless communications. Researchers have proposed many methods to improve the reliability of communication over wireless channels in the presence of fading. Many studies on this topic have focused on diversity techniques. Transmit diversity is a common diversity type in which multiple antennas are employed at the transmitter. Space-time coding is a technique based on transmit diversity introduced by Tarokh et alii in 1998. In this thesis, various types of space-time codes are examined. Since they were originally introduced in the form of trellis codes, a major part is devoted to space-time trellis codes where the fundamental design criteria are established. Then, space-time block coding, which presents a different approach, is introduced and orthogonal spacetime block codes are analyzed in some detail. Lastly, rank codes from coding theory are studied and their relation to space-time coding are investigated.
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Dowker, Fay H. "Space-time wormholes." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359554.

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Lamahewa, Tharaka Anuradha, and tharaka lamahewa@anu edu au. "Space-Time Coding and Space-Time Channel Modelling for Wireless Communications." The Australian National University. Research School of Information Sciences and Engineering, 2007. http://thesis.anu.edu.au./public/adt-ANU20070816.152647.

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In this thesis we investigate the effects of the physical constraints such as antenna aperture size, antenna geometry and non-isotropic scattering distribution parameters (angle of arrival/departure and angular spread) on the performance of coherent and non-coherent space-time coded wireless communication systems. First, we derive analytical expressions for the exact pairwise error probability (PEP) and PEP upper-bound of coherent and non-coherent space-time coded systems operating over spatially correlated fading channels using a moment-generating function-based approach. These analytical expressions account for antenna spacing, antenna geometries and scattering distribution models. Using these new PEP expressions, the degree of the effect of antenna spacing, antenna geometry and angular spread is quantified on the diversity advantage (robustness) given by a space-time code. It is shown that the number of antennas that can be employed in a fixed antenna aperture without diminishing the diversity advantage of a space-time code is determined by the size of the antenna aperture, antenna geometry and the richness of the scattering environment. ¶ In realistic channel environments the performance of space-time coded multiple-input multiple output (MIMO) systems is significantly reduced due to non-ideal antenna placement and non-isotropic scattering. In this thesis, by exploiting the spatial dimension of a MIMO channel we introduce the novel use of linear spatial precoding (or power-loading) based on fixed and known parameters of MIMO channels to ameliorate the effects of non-ideal antenna placement on the performance of coherent and non-coherent space-time codes. The spatial precoder virtually arranges the antennas into an optimal configuration so that the spatial correlation between all antenna elements is minimum. With this design, the precoder is fixed for fixed antenna placement and the transmitter does not require any feedback of channel state information (partial or full) from the receiver. We also derive precoding schemes to exploit non-isotropic scattering distribution parameters of the scattering channel to improve the performance of space-time codes applied on MIMO systems in non-isotropic scattering environments. However, these schemes require the receiver to estimate the non-isotropic parameters and feed them back to the transmitter. ¶ The idea of precoding based on fixed parameters of MIMO channels is extended to maximize the capacity of spatially constrained dense antenna arrays. It is shown that the theoretical maximum capacity available from a fixed region of space can be achieved by power loading based on previously unutilized channel state information contained in the antenna locations. We analyzed the correlation between different modal orders generated at the transmitter region due to spatially constrained antenna arrays in non-isotropic scattering environments, and showed that adjacent modes contribute to higher correlation at the transmitter region. Based on this result, a power loading scheme is proposed which reduces the effects of correlation between adjacent modes at the transmitter region by nulling power onto adjacent transmit modes. ¶ Furthermore, in this thesis a general space-time channel model for down-link transmission in a mobile multiple antenna communication system is developed. The model incorporates deterministic quantities such as physical antenna positions and the motion of the mobile unit (velocity and the direction), and random quantities to capture random scattering environment modeled using a bi-angular power distribution and, in the simplest case, the covariance between transmit and receive angles which captures statistical interdependency. The Kronecker model is shown to be a special case when the power distribution is separable and is shown to overestimate MIMO system performance whenever there is more than one scattering cluster. Expressions for space-time cross correlations and space-frequency cross spectra are given for a number of scattering distributions using Gaussian and Morgenstern's family of multivariate distributions. These new expressions extend the classical Jake's and Clarke's correlation models to general non-isotropic scattering environments.
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Books on the topic "Contributions in space and time"

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Schatzki, Theodore R. Martin Heidegger: Theorist of space. Stuttgart: Steiner, 2007.

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Martin Heidegger: Theorist of space. Stuttgart: Steiner, 2007.

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Spanio, Enrico Tommaso. Il tempo della scienza e il tempo della coscienza: Bergson e i modelli interpretativi dello spazio-tempo. Venezia: Il cardo, 1996.

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1961-, Aschersleben Gisa, Bachmann T, and Müsseler Jochen, eds. Cognitive contributions to the perception of spatial and temporal events. Amsterdam: Elsevier, 1999.

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Tsuchi, Ryūichi. Pacific neogene events in time and space: Contributions to the West Pacific. Shizuoka, Japan: IGCP Project 246, 1994.

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International Seminar for Sociology of Sport (11th 1993 Vienna, Austria). Sport in space and time: Contributions to the 11th International Seminar for Sociology of Sport. Vienna: Vienna University Press, 1995.

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Moretto, Antonio. Dottrina delle grandezze e filosofia trascendentale in Kant. Padova: Il poligrafo, 1999.

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J, Berchoud Marie, ed. Les mots de l'espace: Entre expression et appropriation : contribution à une coordination des points de vue autour des sciences du langage. Paris: L'Harmattan, 2009.

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J, Berchoud Marie, ed. Les mots de l'espace: Entre expression et appropriation : contribution à une coordination des points de vue autour des sciences du langage. Paris: L'Harmattan, 2009.

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Gribbin, John R. Time & space. London: Dorling Kindersley, 2000.

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Book chapters on the topic "Contributions in space and time"

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Kersten, Fred. "Time, Space, Other." In Contributions to Phenomenology, 286–347. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2265-5_9.

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Brand, Claus. "Analysis of time series using linear state space models." In Contributions to Economics, 53–99. Heidelberg: Physica-Verlag HD, 2001. http://dx.doi.org/10.1007/978-3-642-57601-0_4.

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Maggio, Sabrina, Claudia Cappello, and Daniela Pellegrino. "GIS and Geostatistics for Supporting Environmental Analyses in Space-Time." In Contributions to Statistics, 77–92. Milano: Springer Milan, 2012. http://dx.doi.org/10.1007/978-88-470-2751-0_4.

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Fedotenkova, Mariia, Peter beim Graben, Jamie W. Sleigh, and Axel Hutt. "Time-Frequency Representations as Phase Space Reconstruction in Symbolic Recurrence Structure Analysis." In Contributions to Statistics, 89–102. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55789-2_7.

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Pelagatti*, Matteo M. "Price Indexes across Space and Time and the Stochastic Properties of Prices." In Contributions to Statistics, 97–114. Heidelberg: Physica-Verlag HD, 2009. http://dx.doi.org/10.1007/978-3-7908-2140-6_5.

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Aretusi, Graziano, Lara Fontanella, Luigi Ippoliti, and Arcangelo Merla. "Space-time texture analysis in thermal infrared imaging for classification of Raynaud’s Phenomenon." In Contributions to Statistics, 1–12. Milano: Springer Milan, 2010. http://dx.doi.org/10.1007/978-88-470-1386-5_1.

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Ferrari, Guido, Tiziana Laureti, and José Mondéjar Jiménez. "Harmonized Cross Region and Cross Country CPI Time-Space Integration in the Euro-Zone." In Contributions to Statistics, 43–59. Heidelberg: Physica-Verlag HD, 2009. http://dx.doi.org/10.1007/978-3-7908-2140-6_3.

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Rambaldi, Alicia N., D. S. Prasada Rao, and K. Renuka Ganegodage. "Modelling Spatially Correlated Error Structures in the Time-Space Extrapolation of Purchasing Power Parities." In Contributions to Statistics, 63–96. Heidelberg: Physica-Verlag HD, 2009. http://dx.doi.org/10.1007/978-3-7908-2140-6_4.

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Lau, Kwok-ying. "Intersubjectivity and Phenomenology of the Other: Merleau-Ponty’s Contribution." In Space, Time, and Culture, 135–58. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2824-3_10.

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Kersten, Fred. "The Transcendental Phenomenological Building-Up of Primordial Quasi-Objective Space. The Transcendental Phenomenological “Deduction” of Time." In Contributions to Phenomenology, 230–85. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2265-5_8.

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Conference papers on the topic "Contributions in space and time"

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Aimi, Alessandra, Mauro Diligenti, Ilario Mazzieri, Stefano Panizzi, and Chiara Guardasoni. "A Space-time Galerkin BEM for 2D Exterior Wave Propagation Problems." In Selected Contributions from the 9th SIMAI Conference. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814280303_0002.

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Flesia, C., and P. Schwendimann. "Multiple Scattering Contributions on the Lidar Return from Space." In Optical Remote Sensing of the Atmosphere. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/orsa.1991.omd6.

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As long the single scattering is dominant, the distance between the lidar and the scattering volume is well determined, but when the multiple scattering events become significant, the lidar spatial resolution is reduced and only average properties can be analysed from the single scattering measurements. Moreover, all inversion methods relating lidar signal to number densities and particle size distributions must be modified since the multiple scattering affects the direct analysis. The essential requirements of a realistic model for lidar measurements which include the multiple scattering and which can be applied to practical situations are the following: a) Not just correction terms or rough approximations describing certain experimental results, but a general theory tying together the relevant physical parameters we seek to measure. b) Relatively small CPU time for the calculation of high scattering orders. c) A numerically stable and rapidly converging model for the calculation of higher scattering orders, of large cloud depth with relatively high experimental noise.
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CAMACHO, A., and A. MACíAS. "SPACE–TIME TORSION CONTRIBUTION TO QUANTUM INTERFERENCE PHASES." In Proceedings of 2002 International Conference. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812772732_0009.

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Mansour, E. B., C. Gervaise, and A. Khenchaf. "Contributions to passive acoustic oceanic tomography - inversion algorithms based on time frequency space representation for multiple hydrophones processing." In Oceans 2005 - Europe. IEEE, 2005. http://dx.doi.org/10.1109/oceanse.2005.1513179.

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Beckwith, Andrew Walcott. "Representing massive gravitons, as a way to quantify early universe magnetic field contributions to space-time, created by non linear electrodynamics." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2014 (ICNAAM-2014). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4912542.

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Sprenger, Florian, Sascha Kosleck, and Marco Klein. "Wave Riding Through Time – The Contributions of Günther F. Clauss to the Field of Ocean Wave Research." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79170.

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Abstract Günther F. Clauss is one of the most influential and distinguished international experts in the field of ocean engineering. With 50 years of activities in the field, often in collaboration with national and international colleagues, he has contributed significantly to the visibility and progress of ocean engineering as a research discipline. In his scientific contributions, he has repeatedly established new ideas and set standards. His research contributions include the design, installation and decommissioning of offshore structures, the analysis of loads and motions on floating structures and ships, the development of SAR and oil spill response systems and deep-sea technology. Across all areas, from fundamental to application driven research, one topic always stood out — the investigation, simulation and experimental modelling of natural waves aiming at a comprehensive deterministic analysis of offshore structures and ships in natural sea states and extreme waves. From linear superposition of regular waves to the generation of highly nonlinear wave phenomena, from wave-structure interaction to marine oil spill response technologies this paper attempts the almost impossible task: to deliver an overview over 50 years of research by highlighting selected topics, telling the story of Günther F. Clauss who has conquered the inner space.
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Buffington, A., and E. Mendoza. "Geometrical Ray-Tracing Calculations for a Space-Borne, Single-Aperture Astrometric Telescope Facility." In Space Optics for Astrophysics and Earth and Planetary Remote Sensing. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/soa.1988.wb14.

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A 1.5 m telescope in space could achieve unprecedented differential astrometric precision, using essentially present-day technology. A Ronchi ruling in the prime focal plane moves over the images, and photoelectric detectors view the modulated starlight to determine angles between the target and reference stars within a 5 arcminute radius. A 10 microarcsecond precision can be achieved, after about an hour s integration time, for 13th magnitude targets. Such a telescope, operating over 20 years, could detect planets around nearby stars, and make major contributions to other stellar and galactic problems (Levy et al. 1986, 1987).
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McCallum, D. S., X. R. Huang, Martin D. Dawson, Thomas F. Boggess, Arthur L. Smirl, T. C. Hasenberg, and Alan Kost. "Nonlinearities and ultrafast charge transport in an all-binary strained InAs/GaAs hetero n-i-p-i." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.mff1.

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We use differential spectroscopy with tunable psec pulses to temporally and spectrally resolve the formation and decay of optical nonlinearities and space-charge fields in a hetero n-i-p-i that contains quantum wells in the intrinsic region composed of all-binary InAs/GaAs short-period strained layer superlattices. The evolution of the resulting nonlinearity is determined by a delicate competition between excitonic bleaching and the excitonic shift caused by a screening of the builtin field. The relative contributions of the two nonlinearities are complicated functions of fluence, time and wavelength, with the detailed dynamics determined by thermionic emission from the wells, psec charge transport over nm dimensions, screening, and carrier recombinations. The distinctive spectral signatures for excitonic bleaching and shifting allow us to distinguish the two contributions to the nonlinear dynamics and to follow the charge transport and space-charge formation. At the lower fluences, the initial excitonic bleaching gives way to a blue shift of the exciton as the carriers escape the wells in ~3 psec and drift to screen the built-in field in <10 psec. This blue shift persists until the spatially separated carriers recombine nonexponentially on microsecond time scales. At higher fluences, excitonic bleaching and the blue shift are observed simultaneously, since only a fraction of the carriers are required to screen the field and the wells remain partially occupied. On the time scale of ~10 nsec, the bleaching contribution disappears as the carriers within the wells recombine, leaving only the persistent blue shift.
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Vicini, Fabio. "GÜLEN’S RETHINKING OF ISLAMIC PATTERN AND ITS SOCIO-POLITICAL EFFECTS." In Muslim World in Transition: Contributions of the Gülen Movement. Leeds Metropolitan University Press, 2007. http://dx.doi.org/10.55207/gbfn9600.

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Over recent decades Islamic traditions have emerged in new forms in different parts of the Muslim world, interacting differently with secular and neo-liberal patterns of thought and action. In Turkey Fethullah Gülen’s community has been a powerful player in the national debate about the place of Islam in individual and collective life. Through emphasis on the im- portance of ‘secular education’ and a commitment to the defence of both democratic princi- ples and international human rights, Gülen has diffused a new and appealing version of how a ‘good Muslim’ should act in contemporary society. In particular he has defended the role of Islam in the formation of individuals as ethically-responsible moral subjects, a project that overlaps significantly with the ‘secular’ one of forming responsible citizens. Concomitantly, he has shifted the Sufi emphasis on self-discipline/self-denial towards an active, socially- oriented service of others – a form of religious effort that implies a strongly ‘secular’ faith in the human ability to make this world better. This paper looks at the lives of some members of the community to show how this pattern of conduct has affected them. They say that teaching and learning ‘secular’ scientific subjects, combined with total dedication to the project of the movement, constitute, for them, ways to accomplish Islamic deeds and come closer to God. This leads to a consideration of how such a rethinking of Islamic activism has influenced po- litical and sociological transition in Turkey, and a discussion of the potential contribution of the movement towards the development of a more human society in contemporary Europe. From the 1920s onwards, in the context offered by the decline and collapse of the Ottoman Empire, Islamic thinkers, associations and social movements have proliferated their efforts in order to suggest ways to live a good “Muslim life” under newly emerging conditions. Prior to this period, different generations of Muslim Reformers had already argued the compat- ibility of Islam with reason and “modernity”, claiming for the need to renew Islamic tradition recurring to ijtihad. Yet until the end of the XIX century, traditional educational systems, public forms of Islam and models of government had not been dismissed. Only with the dismantlement of the Empire and the constitution of national governments in its different regions, Islamic intellectuals had to face the problem of arranging new patterns of action for Muslim people. With the establishment of multiple nation-states in the so-called Middle East, Islamic intel- lectuals had to cope with secular conceptions about the subject and its place and space for action in society. They had to come to terms with the definitive affirmation of secularism and the consequent process of reconfiguration of local sensibilities, forms of social organisation, and modes of action. As a consequence of these processes, Islamic thinkers started to place emphasis over believers’ individual choice and responsibility both in maintaining an Islamic conduct daily and in realising the values of Islamic society. While under the Ottoman rule to be part of the Islamic ummah was considered an implicit consequence of being a subject of the empire. Not many scientific works have looked at contemporary forms of Islam from this perspective. Usually Islamic instances are considered the outcome of an enduring and unchanging tradition, which try to reproduce itself in opposition to outer-imposed secular practices. Rarely present-day forms of Islamic reasoning and practice have been considered as the result of a process of adjustment to new styles of governance under the modern state. Instead, I argue that new Islamic patterns of action depend on a history of practical and conceptual revision they undertake under different and locally specific versions of secularism. From this perspective I will deal with the specific case of Fethullah Gülen, the head of one of the most famous and influent “renewalist” Islamic movements of contemporary Turkey. From the 1980s this Islamic leader has been able to weave a powerful network of invisible social ties from which he gets both economic and cultural capital. Yet what interests me most in this paper, is that with his open-minded and moderate arguments, Gülen has inspired many people in Turkey to live Islam in a new way. Recurring to ijtihad and drawing from secular epistemology specific ideas about moral agency, he has proposed to a wide public a very at- tractive path for being “good Muslims” in their daily conduct. After an introductive explanation of the movement’s project and of the ideas on which it is based, my aim will be to focus on such a pattern of action. Particular attention will be dedi- cated to Gülen’s conception of a “good Muslim” as a morally-guided agent, because such a conception reveals underneath secular ideas on both responsibility and moral agency. These considerations will constitute the basis from which we can look at the transformation of Islam – and more generally of “the religion” – in the contemporary world. Then a part will be dedicated to defining the specificity of Gülen’s proposal, which will be compared with that of other Islamic revivalist movements in other contexts. Some common point between them will merge from this comparison. Both indeed use the concept of respon- sibility in order to push subjects to actively engage in reviving Islam. Yet, on the other hand, I will show how Gülen’s followers distinguish themselves by the fact their commitment pos- sesses a socially-oriented and reformist character. Finally I will consider the proximity of Gülen’s conceptualisation of moral agency with that the modern state has organised around the idea of “civic virtues”. I argue Gülen’s recall for taking responsibility of social moral decline is a way of charging his followers with a similar burden the modern state has charged its citizens. Thus I suggest the Islamic leader’s pro- posal can be seen as the tentative of supporting the modernity project by defining a new and specific space to Islam and religion into it. This proposal opens the possibility of new and interesting forms of interconnection between secular ideas of modernity and the so-called “Islamic” ones. At the same time I think it sheds a new light over contemporary “renewalist” movements, which can be considered a concrete proposal about how to realise, in a different background, modern forms of governance by reconsidering their moral basis.
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Osman, Muhammad Nawab. "GÜLEN’S CONTRIBUTION TO A MODERATE ISLAM IN SOUTHEAST ASIA." In Muslim World in Transition: Contributions of the Gülen Movement. Leeds Metropolitan University Press, 2007. http://dx.doi.org/10.55207/diek4743.

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This paper aims to demonstrate the relevance of the Gülen movement as a counter to extremist ideology and an encouragement to inter-religious dialogue in the Southeast Asia region. The movement presents a Middle Way Islam, which can accommodate local cultural differences and make a hospitable space for positive relations between Muslims and non-Muslims. Following an account of Fethullah Gülen’s views on extremism and inter-religious dialogue, the paper turns to case studies of Gülen-inspired organisations in Singapore and Indonesia to show how they have applied his ideas to enable inter-religious dialogue and offer an effective alternative to legalistic teaching of Islam. The case studies allow for comparison of the move- ment’s approach to a Muslim-majority and Muslim-minority context. The paper concludes by charting the trajectory of the movement’s role and contribution to the development of a Middle Way Islam in Southeast Asia. The paper is based on a combination of fieldwork with a qualitative approach and documen- tary research. The fieldwork comprises data gathered through participatory observation in Singapore and interviews with key members of the two organisations and their local partners. The documentary research comprises data from the movement’s publications – books, maga- zines (Asya Pasifik), newspaper articles, brochures and online materials. The emergence of Islam as a political force is a recent development in Southeast Asia. Earlier, the impact of the resurgence of Islam had been felt both in the social and cultural realms, through the mushrooming of Muslim organizations attempting to promote a ‘purer’ form of Islam in the region. In more recent times, however, the expression of religiosity has been brought about by way of participation in political parties and groups. More shockingly, some of these groups, such as the terror network known as Jemaati Islamiyah, have sought to use violence to achieve their aims. This has had severe ramifications for both intra-Muslim rela- tions and Muslim-non-Muslim relations in the region. In this chaotic socio-political climate, a group has emerged in the region advocating peace, tolerance and understanding between people of different races and religions. This group is known as the Gülen movement, or is commonly referred to as the hizmet, in Turkey. This paper will demonstrate how the Gülen movement has addressed the issues facing them and remained relevant by developing a counter-trend through proactive measures to oppose extremist ideology and enhance inter-religious discussion in the Southeast Asian region. Its key thrust is to show that the Gülen movement can reverse the current distorted state of Islam back to its original form. The teachings of Islam which is the teachings of the Middle Way can accommodate the cultural differences in Southeast Asia and enhance inter-religious ties between Muslims and non-Muslims in the region. The paper will first examine Fethullah Gülen’s views on extremism and inter-religious dialogue. The paper will then proceed to examine case studies of organizations inspired by Gülen in Singapore and Indonesia and how these organizations utilized his ideas to enhance inter-religious dialogue and provide an alternative to the legalistic discourse on Islam. This section will also attempt to compare and contrast the approach of the organization in a Muslim-majority country (Indonesia) and in a Muslim minority country (Singapore). The paper will conclude by charting a trajectory of the movement’s role its potential contributions to the development of moderate Islam in Southeast Asia. It will be argued that these contributions will become an important counter to extremist ideologies and enhance ties amongst Muslims and between members of different faiths in the region.
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Reports on the topic "Contributions in space and time"

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Calafat, Francisco Mir, Thomas Frederikse, and Kevin Horsburgh. Mediterranean trend and acceleration sea-level estimates. EuroSea, 2023. http://dx.doi.org/10.3289/eurosea_d5.2_v2.

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Sea-level change is geographically non-uniform, with regional departures that can reach several times the global average rate of change. Characterizing this spatial variability and understanding its causes is crucial to the design of adaptation strategies for sea-level rise. This, as it turns out, is no easy feat, primarily due to the sparseness of the observational sea-level record in time and space. Long tide gauge records are restricted to a few locations along the coast. Satellite altimetry offers a better spatial coverage but only since 1992. In the Mediterranean Sea, the tide gauge network is heavily biased towards the European shorelines, with only one record with at least 35 years of data on the African coasts. Past studies have attempted to address the difficulties related to this data sparseness in the Mediterranean Sea by combining the available tide gauge records with satellite altimetry observations. The vast majority of such studies represent sea level through a combination of altimetry-derived empirical orthogonal functions whose temporal amplitudes are then inferred from the tide gauge data. Such methods, however, have tremendous difficulty in separating trends and variability, make no distinction between relative and geocentric sea level, and tell us nothing about the causes of sea level changes. Here, we combine observational data from tide gauges and altimetry with sea-level fingerprints of land-mass changes using a Bayesian hierarchical model (BHM) to quantify the sources of sea-level changes since 1960 in the Mediterranean Sea. The Bayesian estimates are provided on 1/4o x 1/4o regular grid. We find that Mediterranean Sea level rose at a relatively low rate from 1960 to 1990, at which point it started rising significantly faster with comparable contributions from sterodynamic sea level (ocean dynamics and thermal expansion) and land-mass changes. (EuroSea Deliverable, D5.2_v2)
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Jones, Natalie, Cleo Verkuijl, Miquel Muñoz Cabré, and Georgia Piggot. Connecting the dots: mapping references to fossil fuel production in national plans under the UNFCCC for the 2023 Global Stocktake. Stockholm Environment Institute, June 2023. http://dx.doi.org/10.51414/sei2023.040.

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Fossil fuel production must wind down significantly to achieve the long-term temperature goals of the Paris Agreement. How countries have addressed the issue of fossil fuel production in national communications to the UN Framework Convention on Climate Change (UNFCCC), however, has not received extensive attention from the climate community. This report remedies this gap by reviewing nationally determined contributions (NDCs) and longterm low-emissions development strategies (LT-LEDS) countries submitted under the UNFCCC. We show that while more countries have explicitly addressed fossil fuel production in NDCs over time, this has mostly related to continued or expanded production, with little mention of efforts to prepare for a transition away from fossil fuel reliance. Only a small number of countries have used NDCs and LT-LEDS as a space to plan for and communicate policies to support a managed transition away from fossil fuel production. This report contributes to the 2023 Global Stocktake by providing an inventory of how fossil fuel production has been discussed in NDCs and LT-LEDS to date, and by establishing a benchmark by which to assess further rounds of international climate plans and commitments. This also provides a useful tool for policy-makers when developing future NDCs and LT-LEDS.
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Talbot, Pierre J. Photonics Space Time Processing. Fort Belvoir, VA: Defense Technical Information Center, April 1997. http://dx.doi.org/10.21236/ada325865.

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Rockwell, Donald. Space-Time Imaging Systems. Fort Belvoir, VA: Defense Technical Information Center, February 2009. http://dx.doi.org/10.21236/ada584973.

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Souder, Jeffrey K. Space, Time and Force: Relationships in Cyber Space. Fort Belvoir, VA: Defense Technical Information Center, February 2001. http://dx.doi.org/10.21236/ada389919.

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Sundgren, Bo. Communicating in time and space. Inter-university Consortium for Political and Social Research (ICPSR), 2011. http://dx.doi.org/10.3886/ddiothertopics03.

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Anderson, Eric, Sergio Rebelo, and Arlene Wong. Markups Across Space and Time. Cambridge, MA: National Bureau of Economic Research, March 2018. http://dx.doi.org/10.3386/w24434.

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Neill, Duff. Fragmentation and Space-Time Reciprocity. Office of Scientific and Technical Information (OSTI), November 2022. http://dx.doi.org/10.2172/1897394.

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Francis, Neville, Michael T. Owyang, and Daniel Soques. Business Cycles Across Space and Time. Federal Reserve Bank of St. Louis, 2019. http://dx.doi.org/10.20955/wp.2019.010.

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Chew, G. F. Space and time from quantum mechanics. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/10163929.

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