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1
Zhang, Liandong, e Changjiu Zhou. "Smooth and Energy Saving Gait Planning for Humanoid Robot Using Geodesics". Applied Bionics and Biomechanics 9, n. 4 (2012): 457–67. http://dx.doi.org/10.1155/2012/140401.
Testo completoAbstract (sommario):
A novel gait planning method using geodesics for humanoid robot is given in this paper. Both the linear inverted pendulum model and the exact Single Support Phase (SSP) are studied in our energy optimal gait planning based on geodesics. The kinetic energy of a 2-dimension linear inverted pendulum is obtained at first. We regard the kinetic energy as the Riemannian metric and the geodesic on this metric is studied and this is the shortest line between two points on the Riemannian surface. This geodesic is the optimal kinetic energy gait for the COG because the kinetic energy along geodesic is invariant according to the geometric property of geodesics and the walking is smooth and energy saving. Then the walking in Single Support Phase is studied and the energy optimal gait for the swing leg is obtained using our geodesics method. Finally, experiments using state-of-the-art method and using our geodesics optimization method are carried out respectively and the corresponding currents of the joint motors are recorded. With the currents comparing results, the feasibility of this new gait planning method is verified.
2
Šarić, Dragomir. "Geodesic currents and Teichmüller space". Topology 44, n. 1 (gennaio 2005): 99–130. http://dx.doi.org/10.1016/j.top.2004.05.001.
Testo completo
3
Rafi, Kasra, e Juan Souto. "Geodesic Currents and Counting Problems". Geometric and Functional Analysis 29, n. 3 (giugno 2019): 871–89. http://dx.doi.org/10.1007/s00039-019-00502-7.
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Schapira, Barbara, e Samuel Tapie. "Regularity of entropy, geodesic currents and entropy at infinity". Annales Scientifiques de l'École Normale Supérieure 54, n. 1 (2021): 1–68. http://dx.doi.org/10.24033/asens.2455.
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Bonahon, Francis. "The geometry of Teichm�ller space via geodesic currents". Inventiones Mathematicae 92, n. 1 (febbraio 1988): 139–62. http://dx.doi.org/10.1007/bf01393996.
Testo completo
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Francaviglia, Stefano. "Geodesic currents and length compactness for automorphisms of free groups". Transactions of the American Mathematical Society 361, n. 01 (13 agosto 2008): 161–76. http://dx.doi.org/10.1090/s0002-9947-08-04420-6.
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Uyanik, Caglar. "Generalized north–south dynamics on the space of geodesic currents". Geometriae Dedicata 177, n. 1 (30 aprile 2014): 129–48. http://dx.doi.org/10.1007/s10711-014-9982-2.
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Lustig, Martin, e Caglar Uyanik. "North–South dynamics of hyperbolic free group automorphisms on the space of currents". Journal of Topology and Analysis 11, n. 02 (giugno 2019): 427–66. http://dx.doi.org/10.1142/s1793525319500201.
Testo completoAbstract (sommario):
Let [Formula: see text] be a hyperbolic outer automorphism of a non-abelian free group [Formula: see text] such that [Formula: see text] and [Formula: see text] admit absolute train track representatives. We prove that [Formula: see text] acts on the space of projectivized geodesic currents on [Formula: see text] with generalized uniform North-South dynamics.
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Bulyzhenkov, I. E. "Einstein Equation for Nondual Field Matter Modifies Naiver-Stokes Dynamics". International Journal of Modern Physics: Conference Series 47 (gennaio 2018): 1860090. http://dx.doi.org/10.1142/s201019451860090x.
Testo completoAbstract (sommario):
Cartesian extended matter has its own nondual analog of the 1915 Einstein Equation for pure field physics in nonempty moving space. This tensor balance of energy densities and local stresses leads to Maxwell-type equalities for inertial currents and vector geodesic equations for relativistic accelerations of the Ricci scalar for inertial and gravitational mass densities. Field inertia of slow energy flows reestablishes the living force feedback which is missed in Newton-Euler fluid dynamics and in the Navier-Stokes equation.
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Kukuh wibawa, Tatang. "ANALISIS KEBAKARAN TANGKI TIMBUN TIPE ALUMINIUM GEODESIC DOME ROOF". Journal of Forensic Expert 2, n. 1 (28 aprile 2022): 38–57. http://dx.doi.org/10.54579/jfe.v2i1.21.
Testo completoAbstract (sommario):
ABSTRACT
A Storage tank at oil refinery caught fire on Saturday, November 13, 2021 at 20.00 Wib. The burnt tank with a capacity of about 31,000 kiloliters (kl) was fully filled, the impact caused by the fire was in the form of direct losses, damage to surrounding infrastructure and other losses. The research method is to examine the level of damage to the condition of the storage tank due to fire by examining the parts of the tank to determine the location of the first fire location. The second is to carry out a thorough inspection of data and technical information on the tank, operations and systems. The third is carrying out inspection and data analysis, technical information on the installed tank, testing and measuring in the tank. Then the four carry out an analysis of the fire process and conclude from the overall results of the inspection.The results of the fire/explosion was the ignition of Pertalite type hydrocarbon liquid vapor which had reached the flammable range and the explosion limit in the Northwest Part of the Aluminum Geodesic Dome Roof Tank by a lightning strike which could cause tear/melt on the Aluminum Geodesic Dome Roof and damage to the Seal (Seal Hub Cover Gusset and Batten Gasket Sturt) Tank and the inability of the bounding grounding system of the roof cover to the wall and GT (Ground Tank) 1-8 transferring lightning strike currents.
ABSTRAK
Sebuah tangki pada kilang minyak terbakar pada Sabtu, 13 November 2021 pukul 20.00 Wib. Tangki yang terbakar dengan kapasitas sekitar 31.000 kiloliter (kl) terisi penuh, dampak yang diakibatkan kebakaran berupa kerugian langsung, kerugian infrastruktur sekitar yang terdampak dan kerugian lainnya. Metode penelitian ini pertama melakukan pemeriksaan tingkat kerusakan kondisi tangki timbun akibat kebakaran dengan memeriksa bagian-bagian tangki untuk menentukan lokasi api pertama kebakaran. Kedua melaksanakan pemeriksaan data dan keterangan teknis menyeluruh terhadap tangki, operasional dan sistem nya. Ketiga melaksanakan pemeriksaan dan analisa data keterangan teknis terhadap tangki yang terpasang, pengujian dan pengukuran di tangki. Kemudian keempat melaksanakan analisa proses terjadinya kebakaran dan menyimpulkan dari keseluruhan hasil pemeriksaan. Hasil penelitian disimpulkan penyebab terjadinya kebakaran/ledakan adalah tersulutnya uap cairan hidrokarbon jenis Pertalite yang sudah mencapai batas mudah terbakar (flammable range) dan explosion limit di Bagian Barat Laut pada Aluminium Geodesic Dome Roof Tangki Timbun oleh sambaran petir yang dapat menyebabkan sobekan/pelelehan pada Aluminium Geodesic Dome Roof dan kerusakan pada Seal (Seal Hub Cover Gusset dan Batten Gasket Sturt) Tangki Timbun serta ketidakmampuan sistem bounding grounding tutup atap terhadap dinding GT (Ground Tank) 1-8 dalam mentransfer arus sambaran petir.
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IVANOV, E., S. KRIVONOS e R. P. MALIK. "BOUSSINESQ-TYPE EQUATIONS FROM NONLINEAR REALIZATIONS OF W3". International Journal of Modern Physics A 08, n. 18 (20 luglio 1993): 3199–222. http://dx.doi.org/10.1142/s0217751x93001284.
Testo completoAbstract (sommario):
We construct new coset realizations of infinite-dimensional linear [Formula: see text] symmetry associated with Zamolodchikov's W3 algebra which are different from the previously explored sl3 Toda realizations of [Formula: see text]. We deduce the Boussinesq and modified Boussinesq equations as constraints on the geometry of the corresponding coset manifolds. The main characteristic features of these realizations are: (i) among the coset parameters there are space and time coordinates x and t which enter the Boussinesq equations; all other coset parameters are regarded as fields depending on these coordinates; (ii) the spin 2 and 3 currents of W3 and two spin 1 U (1) Kac–Moody currents as well as two spin 0 fields related to the W3 currents via Miura maps, come out as the only essential parameter-fields of these cosets; the remaining coset fields are covariantly expressed through them; (iii) the Miura maps get a new geometric interpretation as [Formula: see text]-covariant constraints which relate the above fields while passing from one coset manifold to another; (iv) the Boussinesq equation and two kinds of the modified Boussinesq equations appear geometrically as the dynamical constraints accomplishing [Formula: see text]-covariant reductions of original coset manifolds to their two-dimensional geodesic submanifolds; (v) the zero-curvature representations for these equations arise automatically as a consequence of the covariant reduction; (vi) W3 symmetry of the Boussinesq equations amounts to the left action of [Formula: see text] symmetry on its cosets. The approach proposed could provide a universal geometric description of the relationship between W-type algebras and integrable hierarchies.
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Xu, Liqing, Ming Xu, Yan Chao, Yi Yuan, Guoqiang Zhong, Manni Jia, Jiayuan Zhang et al. "Neutron-yield reduction in sawtooth crashes from n = 2 resonant magnetic perturbations in EAST". Physics of Plasmas 29, n. 11 (novembre 2022): 112507. http://dx.doi.org/10.1063/5.0102281.
Testo completoAbstract (sommario):
A significant reduction in neutron yield in the plasma core has been observed in EAST neutral beam injection into plasmas with a low-edge safe factor of [Formula: see text] and a n = 2 resonant magnetic perturbation (RMP) during a sawtooth crash. Harmonics of the m/ n = 1/1 mode ( m and n being the poloidal and toroidal mode numbers) develop simultaneously. A sawtooth crash is triggered when the current of the RMP exceeds a critical value; saturated fishbone phase occurs with small RMP currents. Soft x-ray (SXR) tomographic patterns obtained during sawtooth crashes have annular hot-ring shapes outside the q = 1 surface that are similar to those of double tearing modes triggered by off-axis sawtooth crashes in TFTR reversed magnetic shear plasma. M3D nonlinear simulations confirmed the initial penetration of the n = 2 RMP in the plasma core and further demonstrated a complete sawtooth crash with the appearance of a right annular hot ring near the q = 1 surface. Reconstruction of the trajectory of SXR signals before the crash shows chaotic behavior. Moreover, a high-frequency mode was seen to appear just before the sawtooth crash, accompanied by an edge geodesic acoustic mode. This edge mode is free in the saturated fishbone phase. The role of high-frequency mode in the sawtooth crash remains unclear.
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Braslavska, Oksana, Tetiana Dets e Tomas Rozhi. "THE ROLE OF GEODESY IN THE DEVELOPMENT OF DRONE TECHNOLOGIES FOR MEASURING, MAPPING AND MONITORING TERRITORIES". Spatial development, n. 5 (24 novembre 2023): 268–85. http://dx.doi.org/10.32347/2786-7269.2023.5.268-285.
Testo completoAbstract (sommario):
This study examines the relevance and importance of integrating geodetic methods into remote sensing technology from drones. The main focus is on exploring the possibilities of drones as an innovative tool that opens up new perspectives for measuring, mapping and monitoring territories. Advanced geodetic technologies and their applications in drone work are analyzed, including photogrammetry, laser scanning, and other data collection methods. The purpose of the article. Defining and systematizing the role of geodesy in the advancement of drone technologies used for precise measurements, mapping and monitoring of territories. Research task: to analyze the current state of geodetic methods in the context of their application in drone technologies; explore the possibilities of using unmanned aerial vehicles for geodetic work. Develop recommendations for the integration of drone technologies into geodetic practice. Research methods: analytical method - a systematic analysis of scientific publications, articles and reports that highlight current issues of geodesy and drone technologies, their development and application; empirical method - data collection and processing using drones, measurement, monitoring and mapping to assess the accuracy and effectiveness of these technologies; experimental method - conducting field tests of drone technologies to collect primary data, analyze them and compare them with traditional geodetic methods. An important part of the research is the evaluation of the effectiveness of the use of drones in comparison with traditional methods, with a special emphasis on increasing the accuracy, speed and reducing the cost of surveying work. The influence of legal aspects on the use of drones in geodesy is also considered, including the possibility of its adaptation to modern geodetic needs.
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Brzeziński, Aleksander, Marcin Barlik, Ewa Andrasik, Waldemar Izdebski, Michał Kruczyk, Tomasz Liwosz, Tomasz Olszak et al. "Geodetic and Geodynamic Studies at Department of Geodesy and Geodetic Astronomy Wut". Reports on Geodesy and Geoinformatics 100, n. 1 (1 giugno 2016): 165–200. http://dx.doi.org/10.1515/rgg-2016-0013.
Testo completoAbstract (sommario):
Abstract The article presents current issues and research work conducted in the Department of Geodesy and Geodetic Astronomy at the Faculty of Geodesy and Cartography at Warsaw University of Technology. It contains the most important directions of research in the fields of physical geodesy, satellite measurement techniques, GNSS meteorology, geodynamic studies, electronic measurement techniques and terrain information systems.
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SESTRAS, Paul. "Launching Nova Geodesia Journal". Nova Geodesia 1, n. 1 (13 marzo 2021): 14. http://dx.doi.org/10.55779/ng1114.
Testo completoAbstract (sommario):
Geodesy is the science of measuring and representing the earth, whose beginnings are ancient and are found in antiquity. Like other disciplines, it has known a continuous evolution, along with the evolution of human society and the development of knowledge. More than in other sciences, the evolution of geodesy has been dramatically influenced by advances in science and technology. Thus, at present, modern technology has been reached that allows in-depth studies with the help of state-of-the-art technologies, such as radio telescopes, ground surveys, satellites, etc. In Romania, geodetic education and research have a rich history and tradition, but going through numerous and profound restructuring, intensified in the modern era. These were imposed both by the development of science and technology in the field and by economic and social restructuring at the national level. The turmoil and evolutions from the end of the 20th century and the beginning of the 21st century slowly led to the consolidation of the Romanian geodesy and its directions in academic education and research. Ineluctable, things are evolving, and the above issues are being considered by teaching staff and researchers at the universities, research institutes and state and private companies and units with concerns and interests in geodesy. An enthusiastic group of representatives (coming especially from the most recognized universities in Romania, with study programs of land measurements and cadastre) set out to found the new journal Nova Geodesia. After an exhaustive analyzing of the situation of the field in Romania in the current European and international context, they considered that such a journal is timely and necessary in order to support the research in the domain in Romania, but also in the south-eastern part of Europe (facing similar problems) and around the world, truly considering research and creative innovation as the ‘engine of progress’ of humanity. Nova Geodesia has set out to be an open access journal, set up to develop a reliable platform and provide unrestricted access to the scientific literature for the rapid dissemination of recent updates in geodesy and related topics related to cartography, urban administration and the environment, project design and constructions such as dams, bridges, plants, boundary marking, landscape and ecology, environmental management, geography, planetology, hydrography. Through its new approach, the journal adheres to the mission of developing a reliable bridge of communication between people interested in the topics of science and technology mentioned, bringing authentic and unique scientific contributions.
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Batrakova, A., Y. Dorozhko, E. Zakharova e O. Kliuka. "ANALYSIS AND GENERALIZATION OF REGULATORY SUPPORT FOR GEODESIC SUPPORT OF ROAD CONSTRUCTION OBJECTS". Municipal economy of cities 4, n. 164 (1 ottobre 2021): 99–103. http://dx.doi.org/10.33042/2522-1809-2021-4-164-99-103.
Testo completoAbstract (sommario):
The transfer of the project to the site requires the performance of measurements and constructions with high accuracy. Changes in the technology of geodetic works related to the computerization of geodesy, the introduction into geodetic practice of electronic geodetic instruments and automated processing programs, require the introduction into production of both traditional methods of geodetic measurements and new technologies and methods of geodetic works. Despite the fact that geodetic works are an integral part of construction, in the regulations on surveys, design and construction of roads and man-made structures quite limited regulation of the content of work on the transfer of projects to the field, division work, executive surveys, geodetic quality control, accuracy requirements, etc. Given the current state of regulatory and legal support for geodetic support of road construction sites, it is advisable to develop a national standard for the implementation of geodetic surveying and geodetic control in the construction of road construction sites. This standard will supplement the main provisions of regulations on the construction of roads and transport facilities. With the growing volume of design, construction and overhaul of roads, it is necessary to standardize all stages of design and construction work, including those related to geodetic production. The development of technologies and methods of geodetic works related to the computerization of geodesy requires the introduction into production of both traditional methods of geodetic measurements and new technologies and methods of geodetic works. Based on the analysis and generalization of regulatory support for geodetic support of design and construction of roads and artificial structures, the need to develop a national standard for geodetic surveying and geodetic control in the construction of road construction as a supplement to the basic provisions of regulations on road construction and transport facilities.
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Baines, Joshua, Thomas Berry, Alex Simpson e Matt Visser. "Geodesics for the Painlevé–Gullstrand Form of Lense–Thirring Spacetime". Universe 8, n. 2 (10 febbraio 2022): 115. http://dx.doi.org/10.3390/universe8020115.
Testo completoAbstract (sommario):
Recently, the current authors have formulated and extensively explored a rather novel Painlevé–Gullstrand variant of the slow-rotation Lense–Thirring spacetime, a variant which has particularly elegant features—including unit lapse, intrinsically flat spatial 3-slices, and a separable Klein–Gordon equation (wave operator). This spacetime also possesses a non-trivial Killing tensor, implying separability of the Hamilton–Jacobi equation, the existence of a Carter constant, and complete formal integrability of the geodesic equations. Herein, we investigate the geodesics in some detail, in the general situation demonstrating the occurrence of “ultra-elliptic” integrals. Only in certain special cases can the complete geodesic integrability be explicitly cast in terms of elementary functions. The model is potentially of astrophysical interest both in the asymptotic large-distance limit and as an example of a “black hole mimic”, a controlled deformation of the Kerr spacetime that can be contrasted with ongoing astronomical observations.
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Siemiątkowska, Jadwiga. "25 Years of Reports on Geodesy and Geoinformatics". Reports on Geodesy and Geoinformatics 100, n. 1 (1 giugno 2016): 7–15. http://dx.doi.org/10.1515/rgg-2016-0002.
Testo completoAbstract (sommario):
Abstract The article presents an outline of the 25-year history of the journal “Reports on Geodesy and Geoinformatics”. The source of information was mainly the journal issues themselves. Attention was drawn to changes that the journal underwent over a quarter of a century and its relationship with the Institute of Geodesy and Geodetic Astronomy and later the Department of Geodesy and Geodetic Astronomy. Many issues were dedicated to materials from Polish conferences - those organised by the Institute and the international ones attended by the employees of the Institute, which was indicated in the section on the history of the journal. The second part of the article concerns the current activity and importance of the journal. Attention was paid to visibility of “Reports on Geodesy and Geoinformatics” in the domestic and foreign databases. Polish databases where the journal is indexed have been identified and briefly described. A separate issue is the evaluation of the journal, which forms a measure of its popularity among consumers. For this purpose, various parameters and biometrics indicators are used. The article used the Web of Science, Google Scholar and the Ministerial List databases for the assessment of the journal.
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Knill, D. C. "From Contour to Texture: Static Texture Flow is a Strong Cue to Surface Shape". Perception 26, n. 1_suppl (agosto 1997): 205. http://dx.doi.org/10.1068/v970082.
Testo completoAbstract (sommario):
Contours projected from geodesic boundaries of developable surfaces (as are formed by folding and twisting flat surfaces) are particularly salient cues to 3-D surface shape. Textures which are strongly anisotropic (highly oriented) provide a similar source of information. The natural definition of homogeneity for such textures leads to the constraint that the oriented ‘flow’ of texture on a surface follows geodesics of the surface (on average). In the current work, it is shown that the shapes of contours projected from geodesics of developable surfaces, and analogously of oriented texture flow, reliably determine the shapes of the surfaces. On the basis of this analysis, it is suggested that human perception of surface shape from texture has two modes of operation: an isotropic mode, in which the visual system infers surface shape from local texture compression information, and a texture flow mode, in which the curvature of local texture flow determines local surface curvature, based on a geodesic constraint. In order to test the theory, planar texture patterns have been isometrically mapped with varying degrees of global orientation (ranging from isotropic to purely oriented) onto developable surfaces. The theory predicts that subjects' ability to make judgements about surface shape will be good for the isotropic textures and for highly oriented textures, but not for anisotropic textures that are only weakly oriented. As predicted, images of the surfaces with isotropic texture patterns induce strong percepts of shape, as do those of highly oriented textures. Images of anisotropic, weakly oriented patterns, however, elicit only weak percepts of shape.
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Кузин, С. П. "The current status of the main Russian satellite geodetic networks and prospects of their development". Научные труды Института астрономии РАН, n. 3 (1 dicembre 2022): 208–11. http://dx.doi.org/10.51194/inasan.2022.7.3.004.
Testo completoAbstract (sommario):
Наземные измерительные сети существующих в настоящее время различных технологий космической геодезии являются основой для построения и поддержания действующих российских земных систем координат ГСК-2011, ПЗ-90.11, а также планируемой перспективной российской глобальной системы контроля геодезических параметров Земли (СКГПЗ). Главной задачей действующих геодезических сетей является обеспечение российских пользователей высокоточной координатно-временной информацией. На станциях наблюдений конкретной сети спутниковой технологии установлено уникальное основное оборудование данной технологии совместно с дополнительными вспомогательными приборами. Пункты основных существующих геодезических сетей принадлежат различным ведомствам - Росреестру, РАН, Роскосмосу, Росстандарту и другим организациям, что вызывает определенные трудности для согласованной работы сетей, хранению и обмену полученной измерительной информации. Часть действующих станций каждой определенной сети космической технологии должна входить в международные сети для осуществления научной кооперации и сотрудничества. В работе выполнен обзор существующих основных российских наземных спутниковых геодезических сетей и обозначены пути их развития. The ground-based measuring networks of currently existing various space geodesy technologies are the basis for the construction and maintenance of the existing Russian terrestrial coordinate systems GSK-2011, PZ-90.11, as well as the prospective Russian global system for monitoring geodetic parameters of the Earth (GSMGPE) being created. The main task of the existing geodetic networks is to provide Russian users with high-precision coordinate-time information. At the observation stations of a particular satellite technology network, the unique main equipment of this technology is installed together with additional auxiliary devices. The sites of existing geodetic networks belong to various agencies - Rosreestr, RAS, Roscosmos, Rosstandart and other organizations, which causes certain difficulties for the coordinated operation of networks, storage and exchange of the obtained measurement information. A part of the operating stations of each individual space technology network should be included in the international networks for scientific cooperation. The paper provides an overview of the main existing Russian terrestrial satellite geodetic networks and outlined the ways of their development.
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Łyszkowicz, Adam, e Anna Bernatowicz. "Current State of Art of Satellite Altimetry". Annual of Navigation 24, n. 1 (1 dicembre 2017): 31–47. http://dx.doi.org/10.1515/aon-2017-0003.
Testo completoAbstract (sommario):
Abstract One of the fundamental problems of modern geodesy is precise definition of the gravitational field and its changes in time. This is essential in positioning and navigation, geo-physics, geodynamics, oceanography and other sciences related to the climate and Earth’s environment. One of the major sources of gravity data is satellite altimetry that provides gravity data with almost 75% surface of the Earth. Satellite altimetry also provides data to study local, regional and global geophysical processes, the geoid model in the areas of oceans and seas. This technique can be successfully used to study the ocean mean dynamic topography. The results of the investigations and possible products of altimetry will provide a good material for the GGOS (Global Geodetic Observing System) and institutions of IAS (International Altimetry Service). This paper presents the achievements in satellite altimetry in all the above disciplines obtained in the last years.
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Weber, William Joseph, Daniele Bortoluzzi, Paolo Bosetti, Gabriel Consolini, Rita Dolesi e Stefano Vitale. "Application of LISA Gravitational Reference Sensor Hardware to Future Intersatellite Geodesy Missions". Remote Sensing 14, n. 13 (27 giugno 2022): 3092. http://dx.doi.org/10.3390/rs14133092.
Testo completoAbstract (sommario):
Like gravitational wave detection, inter-spacecraft geodesy is a measurement of gravitational tidal accelerations deforming a constellation of two or more orbiting reference test masses (TM). The LISA TM system requires TM in free fall with residual stray accelerations approaching the fm/s2/Hz1/2 level in the mHz band, as demonstrated in the LISA Pathfinder “Einstein’s geodesic explorer” mission. Current geodesy missions are limited by accelerometers with 100 pm/s2/Hz1/2 level, due to intrinsic design limitations, as well as the challenging low Earth orbit environment and operating conditions. A reduction in the TM acceleration noise could lead to an important improvement in the scientific return of future geodesy missions focusing on mass change, especially in a scenario with multiple pairs of geodesy satellites. We present here a preliminary assessment of how the LISA TM system, known as the “gravitational reference sensor” (GRS), could be adapted for use in future geodesy missions aiming at residual TM accelerations noise at the pm/s2/Hz1/2 level, addressing the major design issues and performance limitations. We find that such a performance is possible in a geodesy GRS that is simpler and smaller than that used for LISA, with a lighter, sub-kg TM and gaps reduced from 4 mm to less than 1 mm. Acceleration noise performance limitations will likely be closely tied to the required levels of applied actuation forces on the TM.
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Borovyk, Petro, Yurii Kyselov, Roman Rudyi e Mykhailo Shemiakin. "State Support for Geodetic Business – An Important Prerequisite for Post-War Reconstruction of Ukraine". Oblik i finansi, n. 3(105) (2024): 57–63. http://dx.doi.org/10.33146/2307-9878-2024-3(105)-57-63.
Testo completoAbstract (sommario):
The need for post-war reconstruction of the Ukrainian economy, housing stock and infrastructure facilities will lead to the activation of the construction industry and, therefore, the demand for geodetic services. On the other hand, the long lull in geodesy, caused by the lack of demand for geodetic works in wartime, generates the need for state support of the Ukrainian geodetic business. The article's purpose is to justify the prospects of the practical application of the toolkit of state support for geodetic business in Ukraine to activate the processes of reconstruction of the economy, housing stock and infrastructure facilities. The study results show that tax policy instruments are the most effective means of state support for the geodetic business. In particular, for large geodetic and land surveying enterprises, exemption from paying corporate income tax is relevant, at least for a few years during the post-war reconstruction period. Investment and innovation benefits and income tax preferences will play a crucial stimulating role in the purchase by geodetic business entities of modern geodetic instruments, tools for conducting geospatial measurements and software. Small business entities can be supported by exemption from paying a single tax during the first 5-8 post-war years, cancelling the legislation regarding their mandatory use of settlement transaction registrars, and exemption from military duty assessment and payment. The practical measures of indirect tax support of geodetic business should be: cancellation of the current order of widespread use of tax invoices, as well as the use of geodetic work performance acts instead of the specified tax accounting registers; the introduction of a preferential tax credit not only about the value-added tax on the purchase of investment and innovation tools or programs but also in terms of own effective developments; implementation of a special regime for the accumulation of value-added tax from the sale of geodetic works (services) in the first post-war years.
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Hamzić, Adis. "The Role of Geodesy in High Dams Structural Health Monitoring". Geodetski glasnik, n. 53 (31 dicembre 2022): 39–61. http://dx.doi.org/10.58817/2233-1786.2022.56.53.39.
Testo completoAbstract (sommario):
Structural health monitoring is a synthesis of geodetic and civil engineering methods of measuring, processing and analyzing data. All constructed buildings are subjected to displacements and deformations that can cause damage or even demolition of the building, which endangers people's lives and causes great material damage. Geodesy plays an important role in the technical monitoring of objects, but this fact does not diminish the importance of physical methods of monitoring, nor can it be argued that one method is more important than another. Each of the above-mentioned methods used for technical monitoring of high dams has its significance and only the joint application of all methods can provide an adequate description of the behaviour of the objects due to the influence of various external and internal factors. This paper will describe the history of high dams monitoring, the role of geodesy in monitoring, current trends, legal frameworks governing the monitoring, and the situation in education regarding this area of geodesy.
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Thevoho, I., P. SUKHIY, S. BILOKRYNYTSKIY e K. DARCHUK. "Geodetic support of the territory of Chernivtsi oblast (history, current state)". Modern achievements of geodesic science and industry 1, n. 43 (1 aprile 2022): 41–47. http://dx.doi.org/10.33841/1819-1339-1-43-41-47.
Testo completoAbstract (sommario):
Purpose. The purpose of the research is to substantiate the theoretical and scientific-methodical bases of the importance of geodetic support of the territories of the regions, to assess the possibility of creating topographic maps and plans of one or another scale on the existing geodetic network. Methods. To achieve the purpose of the research, the following methods and techniques were used: historical analysis (to study the history of geodetic support), geodetic (to determine the required density of geodetic points when conducting topographic surveys without violating regulations), mathematical (to determine the completion of the geodetic network, assessments of the possibility of creating topographic maps and plans for a particular area), methods of cartography (to display the points of geodetic support) and others. Results. The history of research of geodetic support of the regions of the territory of Ukraine is hundreds of years old, but only, in our opinion, in recent years (the years of independence of Ukraine) they have acquired a scientific character. The analysis of geodetic support of the territory of Chernivtsi oblast is carried out. The possibility of creating topographic maps and plans on the existing geodetic network has been assessed. To create topographic maps and plans in accordance with the requirements of regulations, the necessary completion of the geodetic network on the territory of Chernivtsi oblast is calculated. Scientific novelty. The history of geodetic support of the territory of Chernivtsi oblast is supplemented by its current state, which is based on the “Basic provisions of the State Geodetic Network of Ukraine” of 1998, which in 2013 were replaced by “Procedure for building the State Geodetic Network”. On the basis of the current DGM, the possibility of creating topographic maps and plans was assessed. The completion of the points of the geodetic network is calculated according to the requirements of normative documents. Practical meaning. Theoretical generalizations, methodical receptions of the conducted researches can be used during carrying out similar researches in other regions, and concrete results of researches – by the organizations, enterprises, departments which carry out geodetic works in the territory of Chernivtsi oblast.
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Li, Menghao, Yang Liu, Yanxiong Liu, Guanxu Chen, Qiuhua Tang, Yunfeng Han e Yuanlan Wen. "Simulative Evaluation of the Underwater Geodetic Network Configuration on Kinematic Positioning Performance". Remote Sensing 14, n. 8 (17 aprile 2022): 1939. http://dx.doi.org/10.3390/rs14081939.
Testo completoAbstract (sommario):
The construction of underwater geodetic networks (UGN) is crucial in marine geodesy. To provide high-precision kinematic positioning for underwater submersibles, an underwater acoustic geodetic network configuration of three seafloor base stations, one subsurface buoy, and one sea surface buoy is proposed. The simulation results show that, for a 3 km-deep sea, based on the proposed UGN, the submersible positioning range and positioning accuracy are primarily affected by the size of the seafloor base station array, while the height of the subsurface buoy has a greater impact on the submersible positioning accuracy than the positioning range. Considering current acoustic ranging technology, the kinematic positioning performance of the UGN is optimal when the seafloor base stations are 9~13 km apart and the subsurface buoy is less than 2.5 km above the seafloor, which can achieve a submersible positioning accuracy of less than 30 m within an underwater space of 25 km × 25 km × 3 km. The proposed cost-effective UGN configuration can provide high-precision submersible kinematic positioning performance for seafloor surveying and ocean precision engineering. The impact of the underwater environment on the acoustic transmission characteristics should be further investigated.
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Łyszkowicz, Adam Bolesław, e Anna Bernatowicz. "Current state of art of satellite altimetry". Geodesy and Cartography 66, n. 2 (20 dicembre 2017): 259–70. http://dx.doi.org/10.1515/geocart-2017-0016.
Testo completoAbstract (sommario):
Abstract One of the fundamental problems of modern geodesy is precise defi nition of the gravitational fi eld and its changes in time. This is essential in positioning and navigation, geophysics, geodynamics, oceanography and other sciences related to the climate and Earth’s environment. One of the major sources of gravity data is satellite altimetry that provides gravity data with almost 75% surface of the Earth. Satellite altimetry also provides data to study local, regional and global geophysical processes, the geoid model in the areas of oceans and seas. This technique can be successfully used to study the ocean mean dynamic topography. The results of the investigations and possible products of altimetry will provide a good material for the GGOS (Global Geodetic Observing System) and institutions of IAS (International Altimetry Service). This paper presents the achievements in satellite altimetry in all the above disciplines obtained in the last years. First very shorly basic concept of satellite altimetry is given. In order to obtain the highest accuracy on range measurements over the ocean improved of altimetry waveforms performed on the ground is described. Next, signifi cant improvements of sea and ocean gravity anomalies models developed presently is shown. Study of sea level and its extremes examined, around European and Australian coasts using tide gauges data and satellite altimetry measurements were described. Then investigations of the phenomenon of the ocean tides, calibration of altimeters, studies of rivers and ice-sheets in the last years are given.
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Oberst, J., H. Hussmann, B. Giese, F. Sohl, D. Shoji, A. Stark, K. Wickhusen e M. Wählisch. "ENCELADUS GEODETIC FRAMEWORK". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W1 (25 luglio 2017): 113–18. http://dx.doi.org/10.5194/isprs-archives-xlii-3-w1-113-2017.
Testo completoAbstract (sommario):
The small (approximately 500 km in diameter) satellite Enceladus is moving near the equatorial plane and deep in the gravity field of its parent planet Saturn. Owing to tidal interaction with its parent, Enceladus has adopted a pronounced 3-axial ellipsoidal shape and is tidally locked, with rotational and orbital periods of about 1.37 days. As the equator of Saturn is inclined to the planet’s orbital plane, Enceladus, like most of the other satellites of Saturn, undergoes pronounced seasons. This paper gives a summary of the current status as well as shortcomings of our current knowledge regarding Enceladus’ geodetic and dynamic parameters.
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Groten, Erwin. "Fundamental Geodetic Parameters 1999". Highlights of Astronomy 12 (2002): 113–16. http://dx.doi.org/10.1017/s1539299600012995.
Testo completoAbstract (sommario):
AbstractThe present (2000) set of primary “constants” and “current best estimates” is being reviewed. The emphasis within IUGG is on the consideration and numerical evaluation of temporal changes of relevant parameters. The accuracy of many parameters has been substantially improved, but many numerical values did not change significantly. Therefore, to avoid confusion IUGG/IAG are reluctant in introducing new official parameter sets but keep “current best estimates” up-to-date.
30
McMullen, Curtis T. "Teichmüller dynamics and unique ergodicity via currents and Hodge theory". Journal für die reine und angewandte Mathematik (Crelles Journal) 2020, n. 768 (1 novembre 2020): 39–54. http://dx.doi.org/10.1515/crelle-2019-0037.
Testo completoAbstract (sommario):
AbstractWe present a cohomological proof that recurrence of suitable Teichmüller geodesics implies unique ergodicity of their terminal foliations. This approach also yields concrete estimates for periodic foliations and new results for polygonal billiards.
31
Gabsatarov, I. V., I. S. Vladimirova e I. A. Sdel’nikova. "Geodynamic monitoring at the GS RAS: Current state and development prospects". Russian Journal of Seismology 4, n. 4 (20 dicembre 2022): 7–23. http://dx.doi.org/10.35540/2686-7907.2022.4.01.
Testo completoAbstract (sommario):
Modern trends in geosciences includes numerical modeling based on vast amounts of direct earth’s surface measurements. A significant increase in the accuracy, detail and scale of the aforementioned measurements in recent decades is based on the active development of space and satellite geodetic methods, as well as the creation of dense observation networks. GS RAS is one of the pioneers in the development of geodynamic monitoring systems based on the usage of satellite geodetic data on the territory of the Russian Federation. The goal of maintaining the leadership position of the GS RAS in the field of geodynamic monitoring emphasizes the development of modern satellite geodetic methods in conditions of limited resources and the need to develop import-substituting technologies. The article considers the existing scientific and methodological groundwork created in the geodynamic monitoring sector of the GS RAS, and formulates promising development areas of the geodynamic monitoring subsystem.
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Capitaine, Nicole. "Models and nomenclature in Earth rotation". Proceedings of the International Astronomical Union 5, S261 (aprile 2009): 69–78. http://dx.doi.org/10.1017/s1743921309990172.
Testo completoAbstract (sommario):
AbstractThe celestial Earth's orientation is required for many applications in fundamental astronomy and geodesy; it is currently determined with sub-milliarcsecond accuracy by astro-geodetic observations. Models for that orientation rely on solutions for the rotation of a rigid Earth model and on the geophysical representation of non-rigid Earth effects. Important IAU 2000/2006 resolutions on reference systems have been passed (and endorsed by the IUGG) that recommend a new paradigm and high accuracy models to be used in the transformation from terrestrial to celestial systems. This paper reviews the consequences of these resolutions on the adopted Earth orientation parameters, IAU precession-nutation models and associated nomenclature. It summarizes the fundamental aspects of the current IAU precession-nutation models and reports on the consideration of General Relativity (GR) in the solutions. This shows that the current definitions and nomenclature for Earth's rotation are compliant with GR and that the IAU precession-nutation is compliant with the IAU 2000 definition of the geocentric celestial reference system in the GR framework; however, the underlying Earth's rotation models basically are Newtonian.
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Pirooznia, Mahmoud, Behzad Voosoghi, Davod Poreh e Arash Amini. "Integrating Hydrography Observations and Geodetic Data for Enhanced Dynamic Topography Estimation". Remote Sensing 16, n. 3 (30 gennaio 2024): 527. http://dx.doi.org/10.3390/rs16030527.
Testo completoAbstract (sommario):
Dynamic topography (DT) refers to the time-varying component of the sea surface height influenced by factors like ocean currents, temperature, and salinity gradients. Accurate estimation of DT is crucial for comprehending oceanic circulation patterns and their impact on climate. This study introduces two approaches to estimating DT: (1) utilizing satellite altimetry to directly observe sea surface height and (2) considering the steric and non-steric components of sea level anomalies. The steric term is calculated using salinity and temperature data obtained from local buoy data, Argo observations, and the World Ocean Atlas model. The non-steric term is calculated using GRACE Satellite gravimetry data. To estimate the assimilated DT, four methods are utilized, including variance component estimation (VCE), Bayesian theory, Kalman filter, and 3D variational (3DVAR). These methods assimilate the two aforementioned schemes. The validity of the estimated DT is assessed by comparing the calculated sea surface current, derived from the obtained DT, with observations from local current meter stations. The results indicate that the VCE method outperforms other methods in determining the final DT. Furthermore, incorporating the steric and non-steric terms of sea level in determining DT in coastal areas enhances the accuracy of estimating sea surface currents.
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Abdurakhmonov, S., Sh Prenov, N. Umarov, F. Gulmurodov e Q. Niyozov. "Application of GIS technologies in the improvement of geodetic and cartographic works in land cadastre". E3S Web of Conferences 386 (2023): 05012. http://dx.doi.org/10.1051/e3sconf/202338605012.
Testo completoAbstract (sommario):
Increasing the accuracy of geodetic measurement tools and methods used in land surveying, topographic mapping, and other works is one of the requirements of the current era. In this case, it is important to develop measures aimed at increasing the speed of geodetic surveying, increasing the accuracy of measuring land areas, and reducing labour productivity, time, and human resource costs. The use of electronic geodetic measuring devices in implementing these works is very convenient for implementing the above requirements. The difference between the current electronic geodetic measuring instruments and the previous ones is that they are designed to measure the angle, distance, and height of points simultaneously.
35
Pilicheva, M., e T. Anopriienko. "CURRENT TRENDS IN THE FIELDS OF GEODESY, LAND MANAGEMENT, LAND CADASTRE AND URBAN PLANNING". Municipal economy of cities 4, n. 164 (1 ottobre 2021): 136–43. http://dx.doi.org/10.33042/2522-1809-2021-4-164-136-143.
Testo completoAbstract (sommario):
The article is devoted to the study of changes in geodesy, land management, State land cadastre and urban planning. It is proved that changes in certain areas are related to changes in the main directions of land reform in Ukraine, namely the formation of territorial communities and the introduction of a full and open land market. The process of formation of communal property in Ukraine and formation of territorial communities are investigated. At the same time, a special type of documentation appears – a comprehensive plan of spatial development of territorial communities, which is both land management documentation and urban planning documentation at the local level and includes topographic and geodetic data. To determine the boundaries of the territory of the community, a new type of land management documentation was introduced – a land management project to establish the boundaries of the territory of the territorial community. It is established that the number and area of territorial communities are different and can differ dozens of times. It is determined that the issue of creating geospatial data infrastructure is becoming more and more developed in Ukraine, because it combines data from the State Geodetic Network, information from the State Land and Urban Cadastre, which provides additional amplification and data entry, development of documentation using its current data. The issue of land market regulation is considered. Its subjects and features of acquisition of the property right to land plots of agricultural purpose are defined. The maximum size of the total area of agricultural land plots is presented – no more than ten thousand hectares, but until January 1, 2024 for the citizens of Ukraine this value should not exceed 100 hectares. The tendency of changes in establishing the sale price of the land plot, namely in carrying out the normative monetary assessment is determined. It is proposed to create a single assessment procedure for all land plots, regardless of their purpose, but taking into account the boundaries of the territorial community. The average cost of agricultural land by regions of Ukraine is analyzed. It is determined that it is uneven and can differ by 2-2.5 times. It is established that the introduction of real-time electronic auctions for the purchase and sale of agricultural land of all forms of ownership allows to achieve openness and transparency of the land market, as well as attracting a wider range of potential buyers.
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Shevchuk, Stanislav O., Nikolay S. Kosarev, Elena S. Cheremisina e Andrey Kh Melesk. "CURRENT PROBLEMS AND FUTURE TRENDS OF GEODETIC AND NAVIGATIONAL SUPPORT OF GEOLOGY AND GEOPHYSICS". Interexpo GEO-Siberia 1, n. 2 (8 luglio 2020): 110–18. http://dx.doi.org/10.33764/2618-981x-2020-1-2-110-118.
Testo completoAbstract (sommario):
The article overviews the current state and problems of geodetic, navigational and timing maintenance of geological and geophysical survey. Innovation trends and perspectives of the technologies’ modernization are considered. The main problems of geodetic, navigational and timing maintenance considered in the article are: old normative and technical documents on this kind of works in Russia, coordinate systems transformations problems, necessity of GNSS-devices adaptation for the specific conditions of geology/geophysics. The main ways of modernization of geodetic, navigational and timing maintenance considered in the paper are: adding newest GNSS technologies (PPP/RTPPP method; new GNSS as Galileo and BeiDou; special services etc.); adding INS/GNSS devices; machine vision systems; remote sensing technologies including UAVs and lidar measurements. The examples of the first steps of using this technologies and methods are given. The main conclusion about the importance of the creation of the common technical documentation base was made.
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Bergman, David R. "Differential Geometry and Acoustics: A Survey". International Journal of Acoustics and Vibration 26, n. 2 (30 giugno 2021): 95–102. http://dx.doi.org/10.20855/ijav.2021.26.21686.
Testo completoAbstract (sommario):
A connection between acoustic rays in a moving inhomogeneous fluid medium and the null geodesic of a pseudo-Riemannian manifold provides a mechanism to derive several well-known results commonly used in acoustic ray theory. Among these include ray integrals for depth dependent sound speed and current profiles commonly used in ocean and aero acoustic modelling. In this new paradigm these are derived by application of a symmetry of the effective metric tensor known as isometry. In addition to deriving well-known results, the application of the full machinery of differential geometry offers a unified approach to modelling acoustic fields in three dimensional random environments with time dependence by, (1) using conformal symmetry to simplify the geodesic equation, and (2) application of geodesic deviation as a generalization of geometric spread.
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Berman, Sigal, Dario G. Liebermann e Joseph McIntyre. "Constrained motion control on a hemispherical surface: path planning". Journal of Neurophysiology 111, n. 5 (1 marzo 2014): 954–68. http://dx.doi.org/10.1152/jn.00132.2013.
Testo completoAbstract (sommario):
Surface-constrained motion, i.e., motion constraint by a rigid surface, is commonly found in daily activities. The current work investigates the choice of hand paths constrained to a concave hemispherical surface. To gain insight regarding paths and their relationship with task dynamics, we simulated various control policies. The simulations demonstrated that following a geodesic path (the shortest path between 2 points on a sphere) is advantageous not only in terms of path length but also in terms of motor planning and sensitivity to motor command errors. These stem from the fact that the applied forces lie in a single plane (that of the geodesic path). To test whether human subjects indeed follow the geodesic, and to see how such motion compares to other paths, we recorded movements in a virtual haptic-visual environment from 11 healthy subjects. The task comprised point-to-point motion between targets at two elevations (30° and 60°). Three typical choices of paths were observed from a frontal plane projection of the paths: circular arcs, straight lines, and arcs close to the geodesic path for each elevation. Based on the measured hand paths, we applied k-means blind separation to divide the subjects into three groups and compared performance indicators. The analysis confirmed that subjects who followed paths closest to the geodesic produced faster and smoother movements compared with the others. The “better” performance reflects the dynamical advantages of following the geodesic path and may also reflect invariant features of control policies used to produce such a surface-constrained motion.
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Elfimov, A. G., A. I. Smolyakov e R. M. O. Galvão. "Geodesic mode instability driven by the electron current in tokamak plasmas". Physics Letters A 378, n. 10 (febbraio 2014): 800–803. http://dx.doi.org/10.1016/j.physleta.2014.01.018.
Testo completo
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Mikoláš, Milan, Rostislav Dandoš e Marie Subiková. "MEASURING SHIFTS BASE TO CALIBRATE TEST EQUIPMENT GNSS". Geodesy and Cartography 39, n. 1 (12 aprile 2013): 1–6. http://dx.doi.org/10.3846/20296991.2013.786870.
Testo completoAbstract (sommario):
This article deals with monitoring the stability of the geodetic base Skalka. Introduction of the article briefly describes the history and purpose of the geodetic base Skalka, gradually resulting in the current characteristics of the base. Main part of the article deals with monitoring the stability of points of the inner and partly outer part of the base. The result is the evaluation of performed geodetic works with the assessment of the testing base stability. Identified vertical and horizontal shifts show that the base can be considered stable in terms of both geological and geodetic points of view.
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Subiková, Marie, e Rostislav Dandoš. "Monitoring gnss test base stability". GeoScience Engineering 58, n. 3 (1 settembre 2012): 23–30. http://dx.doi.org/10.2478/v10205-011-0017-z.
Testo completoAbstract (sommario):
Abstract The article deals with monitoring the stability of the geodetic base Skalka. The introduction of the article briefly describes the history and purpose of the geodetic base Skalka, gradually resulting in the current characteristics of the base. The main part of the article deals with monitoring the stability of points of the inner and partly outer part of the base. The result is the evaluation of performed geodetic works with the assessment of the testing base stability. Identified vertical and horizontal shifts show that the base can be considered stable in terms of both geological and geodetic points of view.
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Bogomolova, Natalia. "Accuracy Appointment for Geodetic Measurements in Historical Object Reconstruction". Proceedings of Petersburg Transport University 19, n. 4 (20 dicembre 2022): 693–701. http://dx.doi.org/10.20295/1815-588x-2022-4-693-701.
Testo completoAbstract (sommario):
Purpose: To consider the issue of the assignment of marking work accuracy at reconstruction stage of a technically complex object. To show the need in accuracy preliminary calculation. After the assignment of geodetic measurement accuracy, to perform geodetic network designing in Credo.dat software package. To determine leveling class that satisfies formed requirements. Methods: Measurement error theory, least squares method, parametric adjustment method, modeling of geodetic networks using package of applied programs. Results: Requirements for the accuracy of marking works were established based on the ones of current regulatory documents. The sequence of the formation of requirements for definition of accuracy in geodetic staking base locations and requirements for the accuracy of used geodetic instruments is considered. Separately, the accuracy of planned and altitudinal geodetic networks is calculated. The possibility to apply class III leveling program when creating altitudinal network to meet accuracy established requirements is shown. Practical significance: The sequence of geodetic work accuracy assignment during historical object reconstruction is outlined on a particular example, the proposed methodology can be recommended for a practical use.
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Musaev, Ilhomjon, Kamolatkhon Khakimova, Mashkhurakhon Nuretdinova, Yunusali Ganiyev e Jakhongir Ibragimov. "Up-to-the-date practices of geodetic measurements for build-up area expansion: a case study from Uzbekistan". E3S Web of Conferences 389 (2023): 03058. http://dx.doi.org/10.1051/e3sconf/202338903058.
Testo completoAbstract (sommario):
This paper seeks to contribute to continuing efforts to better understand and control the effects of urbanization on our environment and society by offering a thorough review of the most recent geodetic measuring techniques for build-up area growth. In this article, we give a case study from Uzbekistan that looks at current geodetic measuring techniques for expanding build-up areas. Uzbekistan is a fast urbanizing nation in Central Asia, and politicians and experts are both deeply concerned about the growth of the country's built-up regions. The case study, which offers a thorough investigation of the geodetic measuring methods and tools used to gauge and track the growth of the built environment, is focused on a particular metropolitan region in Uzbekistan. Therefore, this article gives a summary of current geodetic measurement methods, including remote sensing methods like LiDAR and satellite imaging as well as surveying methods like total station and GNSS. The case study also emphasizes some of the difficulties and restrictions related to these methods, such as the requirement for precise geodetic control points and the inadequacies of satellite imaging in regions with thick vegetation or cloud cover.
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Mikhno, P. B., I. M. Shelkovska, V. I. Kozar, O. M. Kliuka e Yu Ye Trehub. "Justification of geodetic monitoring methodology of the retaining walls on the example of the embankment in Kremenchuk". Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, n. 1 (29 febbraio 2024): 76–83. http://dx.doi.org/10.33271/nvngu/2024-1/076.
Testo completoAbstract (sommario):
Purpose. Development of a methodology for analyzing the results of geodetic measurements according to which it is possible to use the materials of past years for the needs of geodetic monitoring on the example of a retaining wall in the conditions of the city’s recreational area. Methodology. A technological scheme of geodetic monitoring of retaining walls has been developed with four main stages: analysis of initial data, design of geodetic monitoring, periodic observations, processing and analysis of geodetic monitoring results. The conditions of the recreational areas of the city determine the specifics of geodetic monitoring, limit the possibilities of choosing a scheme of the geodetic network and methods of measurements. In this regard, it is proposed to develop models of the development of deformation processes already at the first stage of geodetic monitoring, which will allow geodetic monitoring to be carried out with greater reliability in the future and avoid possible forecasting errors. Findings. The results of the analysis of geodetic measurements in the geodetic networks of Kremenchuk (coordinates and heights of wall signs) show the presence of horizontal and vertical displacements of the retaining wall. In the horizontal plane the retaining wall has shifted in the south-western direction, towards the Dnipro River. In the vertical plane, the retaining wall has subsided. The displacements of different parts of the retaining wall are uneven. The average annual rate of both horizontal and vertical displacements is equivalent and is approximately 1 mm/year. The values of absolute displacement vectors of wall signs in the horizontal plane exceed the accuracy of geodetic measurements and normative tolerances. Originality. Modeling of displacements of retaining walls in the conditions of recreational areas of the city is already underway, taking into account the analysis of the results of geodetic measurements of past years. Practical value. The data of the analysis of the results of geodetic measurements carried out in the geodetic densification networks of Kremenchuk indicate the presence of deformation processes and justify the need for their control through geodetic monitoring. The suggested models can be used as the comparative and combined analysis of future forecast changes based on previous and current results of measurements, which is a topic for another research.
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Faiziev, Sh, U. Ibragimov, Z. Kilichev, H. Suyunova e A. Hakkulova. "Comparison and verification of research results of geodesic works carried out in meliorative systems with the help of geoinformation software". E3S Web of Conferences 411 (2023): 02023. http://dx.doi.org/10.1051/e3sconf/202341102023.
Testo completoAbstract (sommario):
The article covers the issues of creation, optimization and rational use of a system that provides the current status, dynamics and changes of location indicators by conducting geodetic and topographic research using modern technologies of mapping based on geoinformation systems, as well as the problems of geodetic and topographic research.
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Grunau, Saskia, e Jutta Kunz. "Hyperelliptic Functions and Motion in General Relativity". Mathematics 10, n. 12 (7 giugno 2022): 1958. http://dx.doi.org/10.3390/math10121958.
Testo completoAbstract (sommario):
Analysis of black hole spacetimes requires study of the motion of particles and light in these spacetimes. Here exact solutions of the geodesic equations are the means of choice. Numerous interesting black hole spacetimes have been analyzed in terms of elliptic functions. However, the presence of a cosmological constant, higher dimensions or alternative gravity theories often necessitate an analysis in terms of hyperelliptic functions. Here we review the method and current status for solving the geodesic equations for the general hyperelliptic case, illustrating it with a set of examples of genus g=2: higher dimensional Schwarzschild black holes, rotating dyonic U(1)2 black holes, and black rings.
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DERELI, T., e R. W. TUCKER. "ON THE DETECTION OF SCALAR FIELD INDUCED SPACE–TIME TORSION". Modern Physics Letters A 17, n. 07 (7 marzo 2002): 421–28. http://dx.doi.org/10.1142/s021773230200662x.
Testo completoAbstract (sommario):
We argue that the geodesic hypothesis based on autoparallels of the Levi–Cività connection may need refinement in the scalar–tensor theories of gravity. Based on a reformulation of the Brans–Dicke theory in terms of a connection with torsion determined dynamically in terms of the gradient of the Brans–Dicke scalar field, we compute the perihelion shift in the orbit of Mercury on the alternative hypothesis that its worldline is an autoparallel of a connection with torsion. If the Brans–Dicke scalar field couples significantly to matter and test particles move on such worldlines, the current time keeping methods based on the conventional geodesic hypothesis may need refinement.
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Krilov, I. V., D. Mendoza e N. T. Kokina. "ADDING VLBI TO THE MEXICAN GEODETICAL NETWORK". Revista Mexicana de Astronomía y Astrofísica Serie de Conferencias 52 (5 ottobre 2020): 17–18. http://dx.doi.org/10.22201/ia.14052059p.2020.52.06.
Testo completoAbstract (sommario):
This work proposes a plan to use currently installed radiotelescopes in México, to add VLBI in the country's current national geodetic network, so that measures of changes in Earth's surface after earthquakes can be quickly done. This improved network could serve as a base to build the Fundamental Geodetic Astrometry Network in Mexico.
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Lazos, Ilias, Sotirios Sboras e Christos Pikridas. "Tectonic Geodesy Synthesis and Review of the North Aegean Region, Based on the Strain Patterns of the North Aegean Sea, Strymon Basin and Thessalian Basin Case Studies". Applied Sciences 13, n. 17 (2 settembre 2023): 9943. http://dx.doi.org/10.3390/app13179943.
Testo completoAbstract (sommario):
Satellite geodesy, an indispensable modern tool for determining upper-crust deformation, can be used to assess tectonically active structures and improve our understanding of the geotectonic evolution in tectonically active regions. A region fulfilling these criteria is the North Aegean, part of the Eastern Mediterranean. It is one of the most tectonically, and hence, seismically, active regions worldwide, which makes it ideal for applying a satellite geodesy investigation. Although many regional studies have been carried out across the entire Aegean region, there are three more focused case studies that provide better resolution for different parts of the North Aegean. The synthesis of these case studies can lead to an overall geodynamic assessment of the North Aegean. The North Aegean Sea case study is characterized by the North Aegean Trough (NAT), which is directly associated with the westward prolongation of the North Anatolian Fault (NAF). Both NE–SW normal and strike-slip faulting have been documented in this offshore region. Geodetic analysis considers geodetic data, derived from 32 permanent GPS/GNSS stations (recorded for the 2008–2014 time period). This results in the estimation of the Maximum (MaHE) and Minimum (MiHE) Horizontal Extension, Maximum Shear Strain (MSS) and Area Strain (AS) parameters, based on triangular methodology implementation; the same strain parameters have similarly been estimated for the Strymon and Thessalian basins, respectively. The Strymon basin (first case study) is located in the central part of the northern Greek mainland, and it is dominated by NW–SE (up to E–W) dip-slip normal faults; this area has been monitored by 16 permanent GPS/GNSS stations for seven consecutive years. Regarding the Thessalian basin case study, E–W, dip-slip and normal faults are noted at the basin boundaries and within the Thessalian plain. This region has also been monitored for seven consecutive years by 27 permanent GPS/GNSS stations. However, this case study is characterized by a strong seismic event (Mw6.3; 3 March 2021), and thus all strain parameters depicted the pre-seismic deformation. Analysis of these three different case studies confirmed the current tectonic setting of the North Aegean region, while revealing new aspects about the geodynamic evolution of the wider region, such as highlighting areas with significant tectonic activity and the crucial role of strike-slip faulting in the broader Aegean region.
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Ugnenko, E., E. Uzhviieva e O. Tymchenko. "Innovative technologies for designing communication lines, geodetic support for the construction industry and improving the efficiency of specialist training". New Collegium 3, n. 101 (12 ottobre 2020): 79–83. http://dx.doi.org/10.30837/nc.2020.3.79.
Testo completoAbstract (sommario):
In the article it has been analyzed that modern innovative technologies for designing communication lines, geodetic support for the construction industry require solving a wide range of problems associated with the creation of state geodetic networks and the basis for cartographic and topographic surveys. It has been established that to solve current issues on the use of geographic information systems and technologies in engineering surveys, highly qualified specialists in geodetic support of the construction industry, cadastral works and land management are needed.
The basic methodological principles of training specialists in geodetic support of the construction industry are considered. Based on the proposed concept, a list of basic functions is formulated, algorithms and models for solving problems of optimizing the educational process of the university are developed.