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2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Giuseppe De Tomasi ◽  
Ivan M. Khaymovich ◽  
Frank Pollmann ◽  
Simone Warzel

2021 ◽  
Vol 1748 ◽  
pp. 022007
Author(s):  
Changzhong Wu ◽  
Fan Ge ◽  
Guangchao Shang ◽  
Liang Wu ◽  
Hengshuai Guo ◽  
...  

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yanping Mui ◽  
Youzheng Zhang ◽  
Guitao Cao

In this paper, a new geometric structure of projective invariants is proposed. Compared with the traditional invariant calculation method based on 3D reconstruction, this method is comparable in the reliability of invariant calculation. According to this method, the only thing needed to find out is the geometric relationship between 3D points and 2D points, and the invariant can be obtained by using a single frame image. In the method based on 3D reconstruction, the basic matrix of two images is estimated first, and then, the 3D projective invariants are calculated according to the basic matrix. Therefore, in terms of algorithm complexity, the method proposed in this paper is superior to the traditional method. In this paper, we also study the projection transformation from a 3D point to a 2D point in space. According to this relationship, the geometric invariant relationships of other point structures can be easily derived, which have important applications in model-based object recognition. At the same time, the experimental results show that the eight-point structure invariants proposed in this paper can effectively describe the essential characteristics of the 3D structure of the target, without the influence of view, scaling, lighting, and other link factors, and have good stability and reliability.


2020 ◽  
Vol 42 (1) ◽  
pp. 9-39
Author(s):  
Giovanni Agresti

Abstract This paper focuses on the impact of the creation of the new administrative French region «Occitanie – Pyrénées, Méditerranée» under the social representations of the Occitan linguistic space point of view. This new region was created in 2016 by the union of two former regions, Midi-Pyrénées and Languedoc-Roussillon, and does not correspond precisely to the linguistic and historical Occitanie. Therefore, the name of the new region could delegitimize both the name and the linguistic practices – indeed, already remarkably jeopardized.


Author(s):  
Boyang Sun ◽  
Gang Liu ◽  
Zhao Xu ◽  
Shengwei Lv ◽  
Shuming Yao

2019 ◽  
Vol 16 (1) ◽  
pp. 326-334
Author(s):  
Willem Francois Esterhuyse

We introduce a definition of Time and Photons from four Axioms. Basically you take a 4-dimensional manifold, transform them into two superimposed Riemann Spheres and isolate a circle (call this Pp) in one of the spheres. Then one specifies the circle to turn by a unit amount (the turn is an quantum rotation: turn from state A to state B without visiting the in between states) as measured along the circle, every time the Pp encounters a space point. Space fluctuates and expands so this does not give a static circle Pp. The circle's infinity point stays at the north pole of the Riemann Sphere for any finite rotation since: infinity - constant = infinity. Using this one can define basic spacetime and from basic spacetime, Time can be defined if we require special particles to be in the particles of a clock. We go on to define photons and antiphotons. The model predicts that there is a direction in which photons (from the same process) are never emitted. We continue to define a pi-minus.


2019 ◽  
Vol 28 ◽  
pp. 01047
Author(s):  
Konrad Dudziak ◽  
Krzysztof Stawicki ◽  
Andrzej Brykalski

The article presents a comparison of the modified method of the moments and the System Identification Toolbox ™ for the purpose of determining equivalent parameters (depending on the space point, time constants, delays, row of inertia) of simplified transfer function models.


Author(s):  
Hans Diel

Based on a local causal model of the dynamics of curved discrete spacetime, a causal model of quantum field theory in curved discrete spacetime is described. On the elementary level, space(-time) is assumed to consists of interconnected space points. Each space point is connected to a small discrete set of neighboring space points. Density distribution of the space points and the lengths of the space point connections depend on the distance from the gravitational sources. This leads to curved spacetime in accordance with general relativity. Dynamics of spacetime (i.e., the emergence of space and the propagation of space changes) dynamically assigns "in-connections" and "out-connections" to the affected space points. Emergence and propagation of quantum fields (including particles) are mapped to the emergence and propagation of space changes by utilizing identical paths of in/out-connections. Compatibility with standard quantum field theory (QFT) requests the adjustment of the QFT techniques (e.g., Feynman diagrams, Feynman rules, creation/annihilation operators), which typically apply to three in/out connections, to n > 3 in/out connections. In addition, QFT computation in position space has to be adapted to a curved discrete space-time.


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