Jim Al-Khalili - On Time: The Physics That Makes the Universe Tick
01.09.2026 | ISBN: 0691267030 | English | 360 pages | PDF | 9.9 MB
01.09.2026 | ISBN: 0691267030 | English | 360 pages | PDF | 9.9 MB
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Space-Time Reference Systems
Date: 4 Aug 2026 15:33:22
Space-Time Reference Systems by Michael Soffel , Ralf Langhans
English | PDF (True) | 2013 | 321 Pages | ISBN : 3642302254 | 8.1 MB
The high accuracy of modern astronomical spatial-temporal reference systems has made them considerably complex. This book offers a comprehensive overview of such systems. It begins with a discussion of ‘The Problem of Time’, including recent developments in the art of clock making (e.g., optical clocks) and various time scales. The authors address the definitions and realization of spatial coordinates by reference to remote celestial objects such as quasars. After an extensive treatment of classical equinox-based coordinates, new paradigms for setting up a celestial reference system are introduced that no longer refer to the translational and rotational motion of the Earth. The role of relativity in the definition and realization of such systems is clarified.
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Space-Time Reference Systems
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Future Boy: Back to the Future and My Journey Through the Space-Time Continuum
Date: 6 Jun 2026 04:39:45
Michael J. Fox, "Future Boy: Back to the Future and My Journey Through the Space-Time Continuum"
English | ISBN: 1250866782 | 2025 | 176 pages | AZW3 | 11 MB
English | ISBN: 1250866782 | 2025 | 176 pages | AZW3 | 11 MB
The Mathematics of Minkowski Space-Time: With an Introduction to Commutative Hypercomplex Numbers (Repost)
Date: 19 Jun 2024 23:21:38
The Mathematics of Minkowski Space-Time: With an Introduction to Commutative Hypercomplex Numbers by The Mathematics of Minkowski Space-Time: With an Introduction to Commutative Hypercomplex Numbers
English | PDF | 2008 | 267 Pages | ISBN : 3764386134 | 1.8 MB
Hyperbolic numbers are proposed for a rigorous geometric formalization of the space-time symmetry of two-dimensional Special Relativity. The system of hyperbolic numbers as a simple extension of the field of complex numbers is extensively studied in the book. In particular, an exhaustive solution of the "twin paradox" is given, followed by a detailed exposition of space-time geometry and trigonometry. Finally, an appendix on general properties of commutative hypercomplex systems with four unities is presented.
Topological Properties and Global Structure of Space-Time
Date: 16 Jul 2023 08:18:06
Topological Properties and Global Structure of Space-Time by Peter G. Bergmann, Venzo Sabbata
English | PDF | 1986 | 289 Pages | ISBN : 0306423677 | 24 MB
The Ninth Course of the International School of Cosmology and Gravita tion of the Ettore Majorana Centre for Scientific Culture is concerned with "Topological Properties and Global Structure of Space-Time." We consider this topic to possess great importance. Our choice has also been influenced by the fact that there are many quest ions as yet unre solved. Standard general relativity describes space-time as a four-dimensional pseudo-Riemannian manifold, but it does not prescribe its large-scale structure. Inorderto attempt answers to some topological questions, such as whether our universe is open or closed, whether it is orientable, and whether it is complete or possesses singularities, various theoretical approaches to global aspects of gravitational physics are presented here. As topological questions playa role in non-standard theories as weIl, it will be found that some of the lectures and seminar talks in this volume adopt the point of view of standard relativity, whereas others are based on different theories, such as Kaluza-Klein theories, bimetric theories, and supergravity.
Single‐ and Multi‐Carrier DS‐CDMA: Multi‐User Detection, Space‐Time Spreading, Synchronisation, Networking and Standards
Date: 8 May 2023 13:42:49
Single‐ and Multi‐Carrier DS‐CDMA: Multi‐User Detection, Space‐Time Spreading, Synchronisation, Networking and Standards by L. Hanzo, L-L. Yang, E-L. Kuan, K. Yen
English | PDF | 2003 | 1078 Pages | ISBN : 0470863099 | 44.5 MB
This volume is dedicated to a range of CDMA and MC-CDMA transmission aspects of systems designed for communicating over fading wireless channels.