Relevant bibliographies by topics / Global space-time structure

Academic literature on the topic 'Global space-time structure'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Global space-time structure"

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Duggal, K. L. "Space time manifolds and contact structures." International Journal of Mathematics and Mathematical Sciences 13, no. 3 (1990): 545–53. http://dx.doi.org/10.1155/s0161171290000783.

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A new class of contact manifolds (carring a global non-vanishing timelike vector field) is introduced to establish a relation between spacetime manifolds and contact structures. We show that odd dimensional strongly causal (in particular, globally hyperbolic) spacetimes can carry a regular contact structure. As examples, we present a causal spacetime with a non regular contact structure and a physical model [Gödel Universe] of Homogeneous contact manifold. Finally, we construct a model of 4-dimensional spacetime of general relativity as a contact CR-submanifold.
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Wang, Anzhong, and Patricio S. Letelier. "Local and global structure of a thick-domain-wall space-time." Physical Review D 51, no. 12 (June 15, 1995): R6612—R6616. http://dx.doi.org/10.1103/physrevd.51.r6612.

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GUERREIRO, A. "On the quantum space–time structure of light." Journal of Plasma Physics 76, no. 6 (August 17, 2010): 833–43. http://dx.doi.org/10.1017/s0022377810000425.

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AbstractWe extend the quantum theory of Time Refraction for a generic spatial and temporal modulation of the optical properties of a medium, such as a dielectric or a gravitational field. The derivation of the local Bogoliubov transformations relating the global electromagnetic modes (valid over the entire span of space and time) with the local modes (valid for the vicinity of each spatial and temporal position) is presented and used in the evaluation of vacuum photon creation by the optical modulations of the medium. We use this approach to relate and review the results of different quantum effects such as the dynamical Casimir effect, space and Time Refraction, the Unruh effect and radiation from superluminal non-accelerated optical boundaries.
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Moreno, Adam, Mathias Neumann, and Hubert Hasenauer. "Climate limits on European forest structure across space and time." Global and Planetary Change 169 (October 2018): 168–78. http://dx.doi.org/10.1016/j.gloplacha.2018.07.018.

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Beer, Randall D. "Parameter Space Structure of Continuous-Time Recurrent Neural Networks." Neural Computation 18, no. 12 (December 2006): 3009–51. http://dx.doi.org/10.1162/neco.2006.18.12.3009.

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A fundamental challenge for any general theory of neural circuits is how to characterize the structure of the space of all possible circuits over a given model neuron. As a first step in this direction, this letter begins a systematic study of the global parameter space structure of continuous-time recurrent neural networks (CTRNNs), a class of neural models that is simple but dynamically universal. First, we explicitly compute the local bifurcation manifolds of CTRNNs. We then visualize the structure of these manifolds in net input space for small circuits. These visualizations reveal a set of extremal saddle node bifurcation manifolds that divide CTRNN parameter space into regions of dynamics with different effective dimensionality. Next, we completely characterize the combinatorics and geometry of an asymptotically exact approximation to these regions for circuits of arbitrary size. Finally, we show how these regions can be used to calculate estimates of the probability of encountering different kinds of dynamics in CTRNN parameter space.
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Lovejoy, S., J. Pinel, and D. Schertzer. "The global space–time cascade structure of precipitation: Satellites, gridded gauges and reanalyses." Advances in Water Resources 45 (September 2012): 37–50. http://dx.doi.org/10.1016/j.advwatres.2012.03.024.

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Sheftel, V. M., O. I. Bandilet, A. N. Yaroshenko, and A. K. Chernyshev. "Space-time structure and reasons of global, regional, and local variations of atmospheric electricity." Journal of Geophysical Research 99, no. D5 (1994): 10797. http://dx.doi.org/10.1029/93jd02857.

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Cuozzo, Gianluca. "Waste 4.0. Perceptual alterations of space and time." E3S Web of Conferences 119 (2019): 00009. http://dx.doi.org/10.1051/e3sconf/201911900009.

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Living in today’s disfigured environment, where nature is but a fragment of an ancient beauty and richness, means living in a global allegory, where humans are forced to dwell in a lunar landscape – a locus of rotting trash, made up of all our discarded technological gadgets, where everything is swiftly reduced to “kipple” and “gubble” (Philip K. Dick). To put an end to this strabismus, we need to fully investigate the new4.0 e-wastes and expose their ontological and circumstantial structure, which profoundly affects our concept of space (in terms of geopolitics) and of time (as for the durability of our sensations of wellness).
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BARBOSA, D., E. R. BEZERRA DE MELLO, and J. SPINELLY. "INDUCED ELECTROSTATIC SELF-INTERACTION IN THE SPACE–TIME OF A GLOBAL MONOPOLE WITH INNER STRUCTURE." International Journal of Modern Physics D 18, no. 07 (July 2009): 1085–99. http://dx.doi.org/10.1142/s0218271809014960.

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In this work we analyze the electrostatic self-energy and self-force on a pointlike electric-charged particle induced by a global monopole space–time considering an inner structure for it. In order to develop this analysis we calculate the three-dimensional Green function associated with this physical system. We explicitly show that for points inside and outside the monopole's core the self-energy presents two distinct contributions. The first is induced by the geometry associated with the space–time under consideration, and the second is a correction due to the nonvanishing inner structure attributed to it. Considering specifically the ballpoint pen model for the region inside, we are able to obtain exact expressions for the self-energies in the regions outside and inside the monopole's core.
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Dzwinel, W., D. A. Yuen, K. Boryczko, Y. Ben-Zion, S. Yoshioka, and T. Ito. "Nonlinear multidimensional scaling and visualization of earthquake clusters over space, time and feature space." Nonlinear Processes in Geophysics 12, no. 1 (January 28, 2005): 117–28. http://dx.doi.org/10.5194/npg-12-117-2005.

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Abstract. We present a novel technique based on a multi-resolutional clustering and nonlinear multi-dimensional scaling of earthquake patterns to investigate observed and synthetic seismic catalogs. The observed data represent seismic activities around the Japanese islands during 1997-2003. The synthetic data were generated by numerical simulations for various cases of a heterogeneous fault governed by 3-D elastic dislocation and power-law creep. At the highest resolution, we analyze the local cluster structures in the data space of seismic events for the two types of catalogs by using an agglomerative clustering algorithm. We demonstrate that small magnitude events produce local spatio-temporal patches delineating neighboring large events. Seismic events, quantized in space and time, generate the multi-dimensional feature space characterized by the earthquake parameters. Using a non-hierarchical clustering algorithm and nonlinear multi-dimensional scaling, we explore the multitudinous earthquakes by real-time 3-D visualization and inspection of the multivariate clusters. At the spatial resolutions characteristic of the earthquake parameters, all of the ongoing seismicity both before and after the largest events accumulates to a global structure consisting of a few separate clusters in the feature space. We show that by combining the results of clustering in both low and high resolution spaces, we can recognize precursory events more precisely and unravel vital information that cannot be discerned at a single resolution.
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Dissertations / Theses on the topic "Global space-time structure"

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Meyer, Steven J. "TIME, SPACE, POSITION INFORMATION UNIT MESSAGE STRUCTURE OVERVIEW." International Foundation for Telemetering, 2002. http://hdl.handle.net/10150/607515.

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International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, California
The Joint Advanced Missile Instrumentation (JAMI) program is developing a Time, Space, and Position Information (TSPI) unit for high dynamic missile platforms by employing the use of Global Position System (GPS) and inertial sensors. The GPS data is uncoupled from the inertial data. The output of the JAMI TSPI unit follows the packet telemetry protocol and is called the TSPI unit message structure (TUMS). The packet format allows the data stream to stand on its own, be integrated into a packet telemetry system or be an asynchronous data channel in a PCM data stream. On the ground, the JAMI data processor (JDP) Kalman filters the GPS and inertial data to provide a real time TSPI solution to the ranges for display. This paper gives an overview of the message format, the timing relationships between the GPS data and inertial data, and how TUMS is to be handled by the telemetry receiving site to hand it off to the JDP.
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Kommemi, Jonathan David. "The global structure of spherically symmetric charged scalar field spacetimes." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608282.

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Evans, Benjamin James Kingston. "New geometric analysis tools for investigating global structure in general relativity." Phd thesis, 2000. http://hdl.handle.net/1885/147741.

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Books on the topic "Global space-time structure"

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NATO Advanced Study Institute on Topological Properties and Global Structure of Space-Time (1985 Erice, Italy). Topographical properties and global structure of space-time. New York: Plenum in cooperationwith NATO Scientific Affairs Division, 1986.

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NATO, Advanced Study Institute on Topological Properties and Global Structure of Space-Time (1985 Erice Italy). Topological properties and global structure of space-time. New York: Plenum Press, 1986.

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Bergmann, Peter G., and Venzo De Sabbata, eds. Topological Properties and Global Structure of Space-Time. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4.

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Mitze, Timo. Empirical Modelling in Regional Science: Towards a Global Time‒Space‒Structural Analysis. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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Manchak, John Byron. Global Space Time Structure. Oxford University Press, 2013. http://dx.doi.org/10.1093/oxfordhb/9780195392043.013.0017.

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Bergmann, Peter G., and Venzo De Sabbata. Topological Properties and Global Structure of Space-Time. Springer, 2013.

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Bergmann, Peter G., and Venzo De Sabbata. Topological Properties and Global Structure of Space-Time. Springer, 2013.

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Theoretical Foundations of Cosmology: Introduction to the Global Structure of Space-Time. World Scientific Pub Co Inc, 1992.

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(Editor), Peter G. Bergmann, and Venzo De Sabbata (Editor), eds. Topological Properties and Global Structure of Space-Time (Nato a S I Series Series B, Physics). Springer, 1986.

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Harper, Sarah. Demography: A Very Short Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/actrade/9780198725732.001.0001.

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Demography—the study of people—addresses the size, distribution, composition, and density of populations, and considers the impact these factors have on individual lives and the changing structure of human populations. Each generation’s demographic composition influences a person’s life chances; the economic and political structures within which that life is lived; the person’s access to social and natural resources; and life expectancy. Demography: A Very Short Introduction considers how the global population has evolved over time and space and discusses the theorists, theories, and methods involved in studying population trends and movements. It also looks at the emergence of new demographic sub-disciplines and addresses some of the future population challenges.
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Book chapters on the topic "Global space-time structure"

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Galloway, Gregory J. "Some Global Results for Asymptotically Simple Space-Times." In The Conformal Structure of Space-Time, 51–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45818-2_2.

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Clarke, C. J. S. "Singularities: Global and Local Aspects." In Topological Properties and Global Structure of Space-Time, 61–71. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_6.

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Rogers, Alice. "Integration and Global Aspects of Supermanifolds." In Topological Properties and Global Structure of Space-Time, 199–219. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_15.

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Rabin, Jeffrey M. "Manifold and Supermanifold: Global Aspects of Supermanifold Theory." In Topological Properties and Global Structure of Space-Time, 169–76. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_13.

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Rosen, Nathan. "The Space-Time of the Bimetric General Relativity Theory." In Topological Properties and Global Structure of Space-Time, 221–29. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_16.

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Anandan, J. "Measurement of Gravity and Gauge Fields using Quantum Mechanical Probes." In Topological Properties and Global Structure of Space-Time, 1–14. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_1.

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Joshi, P. S. "Conformal Quantisation in Singular Spacetimes." In Topological Properties and Global Structure of Space-Time, 109–19. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_10.

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Kozameh, C. N., and E. T. Newman. "A Non-Local Approach to the Vacuum Maxwell, Yang-Mills, and Einstein Equations." In Topological Properties and Global Structure of Space-Time, 121–51. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_11.

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Newman, Richard P. A. C. "Cosmic Censorship and the Strengths of Singularities." In Topological Properties and Global Structure of Space-Time, 153–68. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_12.

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Reasenberg, Robert D. "Solar-System Tests in Transition." In Topological Properties and Global Structure of Space-Time, 177–98. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3626-4_14.

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Conference papers on the topic "Global space-time structure"

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Mohammadi, Ardeshir Karami. "Vehicle Active Suspension Control: Using AaVariable Structure Model Reference Adaptive Controller." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82712.

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A Variable Structure Model Reference Adaptive Controller (VS-MRAC) is proposed for Active control of vehicle suspension. One DOF quarter car model has been considered. The reference model is a one DOF vibrating system with skyhook damper. The structure of the switching functions is designed based on global exponential stability requirements, and shows perfect model following at a finite time. Sliding surfaces are independent of system parameters and therefore VS-MRAC is insensitive to system parameter variations. Simulation is presented for some road irregularities, and compares to active suspension with fixed structure MRAC, and passive suspension. VS-MRAC shows the best performance on ride and working space
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Zhang, D., Z. Deng, and F. Yan. "The Application of Knee Brace Structure in the Design of Tension Leg Platform." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20332.

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Since its first use in offshore project for drilling and production platform in 1984, more than two dozens of Tension Leg Platform (TLP) structures have been installed in oil and gas fields. The trend for using TLP structure in the exploration of deepwater oil fields has also gained momentum in recent years. The major driving force behind this is because the TLP structure has relatively smaller heave motion, thus it can be used for dry tree application in deepwater. Knee brace has found applications in the design of TLP structures. These vertically diagonal structure members are mainly used to support heavy vertical loads when the column spaces are large. The applications of knee braces have been used for two different stages: the integration stage and the in-place stage. For large topsides, the integration of the platform is usually performed in two or more separate lifting. The knee brace is used to temporarily support the pieces of the topsides before they are integrated together. For conventional type of TLP structures, the top tensioned vertical risers (TTRs) are placed in the middle of the platform to stay away from the mooring system and other subsea systems. The large column-to-column space and heavy TTR loads create some technical and economic challenges for the design of deck structures. To effectively take these vertical loads, knee brace is used to cut down the span of the deck supports. The challenge for this application is how to effectively share the vertical loads while at the same time not to induce much global dynamic action on the knee brace structure. This paper will review the application of knee braces in TLP projects, study the impact of the knee braces to the global action of the hull and topsides structures, and discuss the results of the analysis through a project example. The study will concentrate on the global load distribution through the knee braces, and the interaction between the knee braces and the hull structure under the global load action. Analysis results will be presented and the impact of the knee braces to the global structure will be discussed. These results will show that with proper configuration layout, the knee brace can be designed mainly to take the vertical static load, thus minimize the participation of the dynamic effect. The Author will also discuss the pros and cons of the knee brace structure in TLP application and some key issues which deserve attention during the application.
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Zueck, Robert F. "The Evolved Motions of a Marine Riser or Pipeline." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62970.

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Abstract Analytical, experimental and computational models have historically been heavily simplified, linearized, and otherwise reduced. This paper shows how such model reductions eliminate the fundamental geometric changes that determine real behavior in cables, strings, moorings, guys, pipelines, riser, plates, skins, subsea hulls, and other such slender and thin structures. The paper details each physical quantity that we must add back into our overly reduced models to improve the basic nature, evolution, and accuracy of the resulting motions and vibrations. For example, even slight changes in local rotation anywhere along a cable can create large nonlinear changes in the dynamic nature of its behavior. The evolved complexity of the resulting global motions and vibrations in space and time often defy what we normally expect from such a simple structure. Although this paper focuses on the modeling of deep-water moorings and risers of an ocean platform, the same geometric effect is fundamental to most science and engineering models. Understanding how small changes in geometry can nonlinearly affect any structured behavior will help demystify much of the poorly-understood motions and vibrations in a large diversity of applications, including induced vibrations, sound, structural acoustics, aero-elasticity, sound, light and atomic radiation.
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Lazarevich, Anatoly Arkadjevich. "Informational and digital world in the mirror of processes of globalization." In 5th International Conference “Futurity designing. Digital reality problems”. Keldysh Institute of Applied Mathematics, 2022. http://dx.doi.org/10.20948/future-2022-5.

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The paper’s author pays his attention to two key trends of our time. There are the development of processes of globalization and the formation of the total digitalization. So we deal with the question of the correlation of these trends, their interdependence and determinism, the completeness of the content of the described concepts’ data. The post-industrial type of social development and the followed informational and digital structure have the necessary set of signs of globalization, i.e. they are social structures of a global nature. The author substantiates the thesis that post-industrial processes, as well as the processes of informatization, information and digital technologies and various types of social communications built on their basis are causal determinants of globalization, while globalization itself belongs to the category of investigative phenomena that can affect the content of the factors which have caused it. The author emphasizes the fact that in socio-practical context the processes of countering globalization have specific forms of political, economic and socio-cultural measures. But a worthy and effective counteraction to globalization can be carried out by implementing at least two factors: firstly, the production of material and spiritual socially significant goods on an innovative basis, and, secondly, the creation of technologies of their extrapolation beyond a certain local national space. The peculiarity of contemporary processes of social dynamics lies in the active confrontation of universal and local factors in culture. The global communication space of modern culture is determined by many things. Among these things is scientific and technological progress or the universal nature of scientific creativity and its results including the latest computer and information and digital technologies. The intensive development and at the same time the weak manageability of global informational processes determines the desire of the international community to coordinate them. That’s why the connection of value-semantic and institutional, structural-technological principles of management of global processes is actualized.
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Li, Chen, Xutan Peng, Hao Peng, Jianxin Li, and Lihong Wang. "TextGTL: Graph-based Transductive Learning for Semi-supervised Text Classification via Structure-Sensitive Interpolation." In Thirtieth International Joint Conference on Artificial Intelligence {IJCAI-21}. California: International Joint Conferences on Artificial Intelligence Organization, 2021. http://dx.doi.org/10.24963/ijcai.2021/369.

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Compared with traditional sequential learning models, graph-based neural networks exhibit excellent properties when encoding text, such as the capacity of capturing global and local information simultaneously. Especially in the semi-supervised scenario, propagating information along the edge can effectively alleviate the sparsity of labeled data. In this paper, beyond the existing architecture of heterogeneous word-document graphs, for the first time, we investigate how to construct lightweight non-heterogeneous graphs based on different linguistic information to better serve free text representation learning. Then, a novel semi-supervised framework for text classification that refines graph topology under theoretical guidance and shares information across different text graphs, namely Text-oriented Graph-based Transductive Learning (TextGTL), is proposed. TextGTL also performs attribute space interpolation based on dense substructure in graphs to predict low-entropy labels with high-quality feature nodes for data augmentation. To verify the effectiveness of TextGTL, we conduct extensive experiments on various benchmark datasets, observing significant performance gains over conventional heterogeneous graphs. In addition, we also design ablation studies to dive deep into the validity of components in TextTGL.
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ZHOU, PEIYUAN, and OTIS KOPSAFTOPOULOS. "DAMAGE LOCALIZATION AND MAGNITUDE ESTIMATION ON A COMPOSITE UAV WING VIA STOCHASTIC FUNCTIONALLY POOLED MODELS." In Structural Health Monitoring 2021. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/shm2021/36240.

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A vibration-based active-sensing global SHM method is proposed and evaluated for its damage localization and quantification accuracy on complex wing structure. In the process, the wing structure is actuated by a white noise vibration and the response signals are collected by a distributed sensor network. The proposed SHM method first utilize auto-regressive exogenous (ARX) model [1] for representing the time-domain response at each sensor location under various damage conditions, where stochasticity contained in structural response is minimized and identified. ARX models are then mapped to damage parameter space via vector-dependent functionally pooled (VFP) method [2]. Then, a damage estimation algorithm based on minimizing VFP-ARX model prediction error is developed. Finally, the damage estimation results are evaluated as the possibility of leveraging multiple senor signal in SHM process is implicated.
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Mikielewicz, Renata. "The difference in lifestyle: "a shopping list" and social engagement as urban process stimulator." In Virtual City and Territory. Barcelona: Centre de Política de Sòl i Valoracions, 2016. http://dx.doi.org/10.5821/ctv.8076.

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The urbanized space mirrors the way the society works. We have on one side the commercialization of the space and on the other side attempts to make the space more human through the social engagement of architects and urban planners. The yearning for authenticity is confronted with different forms of standardization of urban space and the domination of global brands. The space of a city core’s streets is full of brands, which symbolize the progress. The researchers concentrate mostly on this most visible aspect of globalization phenomenon when describing the urban processes, which are visible in the space. At the same time the strategies based on the idea of ‘the creative city’ for rather many of the cities, also polish towns, became an element of specific survival strategy in the time of profound changes in social and economic areas, caused by globalization. The author analyzes some of these contradicted? or/and consistent? types of nowadays urban culture trying to answer the question about the role of urban design in the context of contemporary trends shaping the locality and the global aspects of the city and its structure and concentrates on different examples of contemporary cities. The search for possible solutions based on sustainable development and the confrontation with the real urban development strategies (examples include the case study for the city of Lodz) are the starting points for the author to find answers how to re-shape the urban space into a user friendly city.
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Pendleton, Ian. "NHNY Via Verde – A New Design Standard For Affordable Housing." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.0271.

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<p>NHNY Via Verde is a global model of sustainable housing development. Located in a Bronx brownfield, the 294,000 SF structure contains 222 residential units with 40,000 SF of green roofs and open space. Cascading buildings surrounding a central courtyard consists of a 21 story tower, 16- to 7-story midrise and 5 to 3-story low-rise. Interconnected, accessible green roofs provide continuous access from the courtyard to 12<span>th</span> level roof: the “via verde” or “green way”. Primary structure consists of cast-in-place concrete at the tower and concrete masonry bearing walls with precast concrete plank at mid- and low-rises. These conventional materials are arranged in unconventional ways to maximize efficiency, generating the architectural unit layout from optimal plank spans and eliminating façade bearing walls for prefabricated façades with sunshades and balconies. Secondary structural steel framing supports low rise storefronts, extensive roof PV panel arrays and a rainwater catchment system. Fly ash replacement was maximized in all concrete, and the time effect on strength gain was managed in construction. The large building volume required internal building separations with three independent structures engineered for drift compatibility. Foundation pile capacities vary to optimize efficiency to wide-ranging building heights.</p>
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Christiansen, Niels Hørbye, and Benny Korsholm Tang. "Neural Networks for Tubular Joint Optimization in Offshore Jacket Structures." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54846.

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The use of jacket structures to support offshore installations has for a long time been a popular choice in places with appropriate water depths. In recent years the use of jacket structures as offshore wind turbine foundations has also attracted increasing attention and is becoming a feasible alternative to traditional monopile foundations. One of the key challenges in jacket design is optimizing tubular joints in terms of fatigue resistance. As it is not practically possible to include detailed FEM joint models in global jacket models designers are forced to look for alternative methods to obtain realistic joint representations. This is done by calculating influence factors (INF) and stress concentration factors (SCF) to be applied to simplified models of relevant tubular joints in global models in order to achieve a realistic force flow in the structure. One simple and widely used method is to apply parametric formulas, e.g. those suggested by Efthymiou. However, these approximating formulas have a fairly limited validity range. Therefore, on complex joint the most reliable way to determine INF’s is by setting up refined FEM models of relevant joints and then subsequently using the calculated factors in the global model. This strategy is computationally demanding and hence, very time consuming, as a new detailed FEM analysis of the tubular joint must be conducted for each step in the optimization process. The present paper demonstrates how this time consuming procedure can be avoided by use of artificial neural networks (ANN) trained to estimate INF’s on tubular joints. The neural network is trained on a pre-generated library of detailed FEM joint models and is then able to predict INF’s on joints that are not part of the library — and thereby providing a significant reduction in calculation time during the jacket/joint optimization process. The analysis is conducted on a typical joint on a three legged jacket structure. The joint is located on a jacket leg and has two incoming braces. Such a joint has a finite number of free design variables, e.g. chord diameter/thickness, brace diameter/thickness, brace angle, gap etc. Each of these free variables can be considered as a dimension in the joint design space. Having a sufficient number of FEM joint models in the library the neural network can be trained to recognize and predict underlying patterns in this design space. The method is demonstrated on a limited number of design variables but should easily be extended to cover all variables as the joint library is expanded to include all dimensions.
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Tian, Zhenhua, Guoliang Huang, and Lingyu Yu. "Study of Guided Wave Propagation in Honeycomb Sandwich Structures." In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7642.

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This paper studies the guided waves in honeycomb sandwich structures and explores the ability of guided waves for the debonding damage detection. Both the finite element (FE) simulations and laser vibrometry experiments are used. A three-dimensional (3D) FE model is built to simulate the guided waves in a honeycomb sandwich plate. The simulation results show the guided waves in the structure depend on the wave frequency. At low frequencies, the global guided waves propagate in the entire sandwich, while leaky guided waves dominate in the skin panel at high frequencies. To further understand the guided wave propagation fundamentals, laser vibrometry experiments are performed. The waveforms, time-space wavefields, and frequency-wavenumber spectra obtained from the experiments are used to unveil the wave propagation features. The experimental results confirm the leaky guided waves. Moreover, the experimental results show the complex wave interactions induced by the honeycomb core. When the debonding between the skin and honeycomb core presents, the guided wave amplitude increases, and the wave interaction with the honeycomb core reduces.
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Reports on the topic "Global space-time structure"

1

Oltarzhevskyi, Dmytro. HISTORICAL FEATURES OF CORPORATE MEDIA FORMATION IN UKRAINE AND IN THE WORLD. Ivan Franko National University of Lviv, February 2021. http://dx.doi.org/10.30970/vjo.2021.49.11067.

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The article examines the world and Ukrainian history of corporate periodicals. The main purpose of this study is to reproduce an objective global picture of the emergence and formation of corporate periodicals, taking into account the business and socio-economic context. Accordingly, its tasks are to compare the conditions and features of corporate media genesis in different countries, to determine the main factors of their development, as well as to clarify the transformations of the terminological apparatus. The research is based on mostly foreign secondary scientific works published from 1915 to the present time. The literature was studied using methods such as overview, historical, functional and thematic analysis, description, and generalization. A systematic approach was used to determine the role and place of each element in the system, as well as to comprehensively consider the object in the general historical context and within the current scientific discourse. The method of systematization made it possible to establish internal and external connections, patterns and contradictions in the development of the object of study. The main historical milestones on this path are identified, examples of the first successful corporate publications and their contribution to business development, public relations, and corporate communications are considered. It was found that corporate media emerged in the mid-nineteenth century spontaneously, on the wave of practical business needs in response to industrialization, company increase, staff growth, and consumer market development. Their appearance preceded the formation of the public relations industry and changed the structure of the information space. The scientific significance of this research is that the historical look at the evolution of corporate media provides an understanding of their place, influence, capabilities, and growing communicative role in the digital age.
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Roye, Thorsten. Unsettled Technology Areas in Deterministic Assembly Approaches for Industry 4.0. SAE International, August 2021. http://dx.doi.org/10.4271/epr2021018.

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Increased production rates and cost reduction are affecting manufacturing in all sectors of the mobility industry. One enabling methodology that could achieve these goals in the burgeoning “Industry 4.0” environment is the deterministic assembly (DA) approach. The DA approach is defined as an optimized assembly process; it always forms the same final structure and has a strong link to design-for-assembly and design-for-automation methodologies. It also looks at the whole supply chain, enabling drastic savings at the original equipment manufacturer (OEM) level by reducing recurring costs and lead time. Within Industry 4.0, DA will be required mainly for the aerospace and the space industry, but serves as an interesting approach for other industries assembling large and/or complex components. In its entirety, the DA approach connects an entire supply chain—from part manufacturing at an elementary level to an OEM’s final assembly line level. Addressing the whole process of aircraft design and manufacturing is necessary to develop further collaboration models between OEMs and the supply chain, including addressing the most pressing technology challenges. Since all parts aggregate at the OEM level, the OEM—as an integrator of all these single parts—needs special end-to-end methodologies to drastically decrease cost and lead time. This holistic approach can be considered in part design as well (in the design-for-automation and design-for-assembly philosophy). This allows for quicker assembly at the OEM level, such as “part-to-part” or “hole-to-hole” approaches, versus traditional, classical assembly methods like manual measurement or measurement-assisted assembly. In addition, it can increase flexibility regarding rate changes in production (such as those due to pandemic- or climate-related environmental challenges). The standardization and harmonization of these areas would help all industries and designers to have a deterministic approach with an end-to-end concept. Simulations can easily compare possible production and assembly steps with different impacts on local and global tolerances. Global measurement feedback needs high-accuracy turnkey solutions, which are very costly and inflexible. The goal of standardization would be to use Industry 4.0 feedback and features, as well as to define several building blocks of the DA approach as a one-way assembly (also known as one-up assembly, or “OUA”), false one-way assembly, “Jig-as-Master,” etc., up to the hole-to-hole assembly approach. The evolution of these assembly principles and the link to simulation approaches are undefined and unsolved domains; they are discussed in this report. They must be discussed in greater depth with aims of (first) clarifying the scope of the industry-wide alignment needs and (second) prioritizing the issues requiring standardization. NOTE: SAE EDGE™ Research Reports are intended to identify and illuminate key issues in emerging, but still unsettled, technologies of interest to the mobility industry. The goal of SAE EDGE™ Research Reports is to stimulate discussion and work in the hope of promoting and speeding resolution of identified issues. SAE EDGE™ Research Reports are not intended to resolve the challenges they identify or close any topic to further scrutiny.
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Mehra, Tanya, and Julie Coleman. The Role of the UN Security Council in Countering Terrorism & Violent Extremism: The Limits of Criminalization? RESOLVE Network, October 2022. http://dx.doi.org/10.37805/sfi2022.4.

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After the 9/11 attacks, a united global community entered an era which saw the proliferation of United Nations entities and organs focused on responding to terrorism. These bodies were created, at least in part, in response to the recognized need for a comprehensive multilateral counter-terrorism architecture to ensure international peace and security in the face of the growing specter of violent extremism. This response has notably also included an array of UN Security Council resolutions (UNSCRs) adopted to counter the threat of terrorism. A little over 20 years after the adoption of Resolution 1373 (2001), 52 terrorism related resolutions now exist, creating an elaborate set of measures for Member States to implement. Despite this, however, terrorism was arguably more prevalent in 2021 than in 2001. A myriad of factors have led to the continued spread of terrorism, including the increasingly transnational nature of terrorists and terrorist networks, as well as the failure to adequately address the structural factors and underlying conditions that are conducive to the spread of violent extremism. In order to explain its persistence, one must not only examine the continued appeal of terrorist groups and violent extremist ideology and propaganda, but also reflect upon where, how, and why counter-terrorism responses have often failed to reduce the threat or, in some cases, even exacerbated the factors which give rise to terrorism in the first place. This includes the response of the Security Council, whose resolutions have created the obligation or expectation for Member States to continuously expand the criminalization of terrorism, without evidence that such an approach will lead to less terrorism. This brief focuses on how some UNSCRs include measures that require Member States to criminalize conduct that has historically fallen within the pre-crime space and lacks a clear link to terrorist activities, and examines the subsequent impact this has on human rights and the effectiveness of the criminal justice system. At the same time, it explores the role that States themselves have played in the exceptionalization of terrorism in terms of criminal justice responses. Finally, it offers recommendations for both the UNSC and Members States on how to ensure that counter-terrorism architecture can both be human-rights based and simultaneously conducive to promoting peace and security.
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