two bodies
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2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Gustav Uhre Jakobsen ◽  
Gustav Mogull ◽  
Jan Plefka ◽  
Jan Steinhoff

Abstract Picture yourself in the wave zone of a gravitational scattering event of two massive, spinning compact bodies (black holes, neutron stars or stars). We show that this system of genuine astrophysical interest enjoys a hidden $$ \mathcal{N} $$ N = 2 supersymmetry, at least to the order of spin-squared (quadrupole) interactions in arbitrary D spacetime dimensions. Using the $$ \mathcal{N} $$ N = 2 supersymmetric worldline action, augmented by finite-size corrections for the non-Kerr black hole case, we build a quadratic-in-spin extension to the worldline quantum field theory (WQFT) formalism introduced in our previous work, and calculate the two bodies’ deflection and spin kick to sub-leading order in the post-Minkowskian expansion in Newton’s constant G. For spins aligned to the normal vector of the scattering plane we also obtain the scattering angle. All D-dimensional observables are derived from an eikonal phase given as the free energy of the WQFT that is invariant under the $$ \mathcal{N} $$ N = 2 supersymmetry transformations.


2021 ◽  
pp. 369-390
Author(s):  
Gabriele Abels

This chapter investigates the European Economic and Social Committee (EESC) and the Committee of the Regions (CoR), two bodies established in 1957 and 1992, respectively. Both Committees are consultative; their rationale is to provide expertise to EU legislators and to represent functional respectively territorial interests. These organs share a number of similarities with regard to their legal basis and policymaking influence. Both have pursued diverse activities beyond their official mandates in a quest to find their own identities and exercise voice in the EU system. This chapter analyses these committees with regard to their development, membership, and activities, illustrating how both embraced timely topics and seek to involve themselves in the larger debate on the future of Europe. Thereby, they contribute to the EU’s development as a complex, multilevel, and multichannel democracy.


2021 ◽  
Vol 157 (A4) ◽  
Author(s):  
H M WANG ◽  
L WANG ◽  
L Q TU ◽  
C H ZHAO

ellipsoids are taken as an example. By coupling the motion equations of the two bodies and the fluid flow equations, the interaction forces and moments are calculated, and the tracks are predicted. The numerical results for the model fixed motion (only free to surge) at constant speed are compared with those published in literature for the validation of the method proposed in this paper, and good agreement is found. On this basis, more complicated multi-degree of freedom motions in surge, sway and yaw directions induced by the interaction effects are simulated. By systematically comparing and analyzing the numerical results obtained at different speeds, lateral distances and body sizes, the influences of speed and lateral distance and body size The sway and yaw motion will be induced additionally due to the interaction effects when two encountering bodies sail in close proximity, which may lead to the collision accident. In the present study, two on the hydrodynamic forces are elucidated. 


2021 ◽  
Vol 68 (1 Jan-Feb) ◽  
Author(s):  
M. Abu-shady ◽  
N. H. Gerish ◽  
M. M. A. Ahmed

The exotic particles such as the pentaquarks are to strengthen understanding of important interactions and the principle of QCD in which pentaquarks contain two heavy- valence quarks. The structure of two bodies including an antiquark and two-diquark is introduced. A new potential for quark interaction is suggested which includes the logarithm potential, the linear potential, and the spin-spin interaction. The suggested potential is included in the framework of spinless of Bethe-Salpeter equation. A comparison with other works is presented which provides a good description of pentaquarks.


2021 ◽  
pp. 170-189
Author(s):  
Peter P. Goché

Drawing is an innovative practice that provides architects an emancipated spatial apparatus freed from capitalistic pressures such as, deadline, utility and profitability. Through an immersive act to which I refer as experiential criticism, my practice materializes a 1:1 drawing operation with a relative capacity to unite or react or interact with the latent dimensions of the inherited landscape – the post-industrial remains of capitalism and the Midwestern family farm legacies. Utilizes a range of domains as means of exploring not only the tangible but the intangible nature of such material cultivations, the work is based on a series of modulated experimental actions. Reflecting on two bodies of work, Perforated Horizon and InsideOute, this content proposal will consider the practice of drawing as a means of observation and teaching specific to volume, materiality, context and time.


2021 ◽  
Author(s):  
◽  
Paulette Holland

<p>In the New Zealand National Curriculum maps are defined as an essential skill along with graphs and tables. Despite the widespread use of maps in everyday life and their incorporation in more than one area of the curriculum there has been little research in New Zealand on children’s knowledge of maps, their use and where and how children encounter them. The research reported in this thesis is an attempt to broaden our understanding of young school children’s knowledge of maps and in particular the sources of their map knowledge in family, neighbourhood and school. The study was informed by two bodies of work, that of Fay Panckhurst on preschoolers’ map knowledge and its sources, and the NEMP studies which assessed graphs, tables and maps at Years 4 and 8. From a Decile 2 school, a sample of Year 3 & 4 children was selected before they had been introduced to maps at school. The students were interviews individually. Each was asked to select the maps from a collection, which included graphs and tables. The selection task showed that the students knew what maps were but had trouble recognising graphs or tables. The students then answered a set of questions about maps, and drew a map of New Zealand marking it on a number of locations. Over a period of three weeks their classroom teacher taught a unit on maps. The sample students were then interviewed again. While their original answers showed the influence of maps in homes and neighbourhood the classroom unit had provided them with technical knowledge and map language, and their maps of New Zealand improved in relation to shape, relationship of the islands, and knowledge of locations. It is argued that maps are not solely “skills” but as cultural artefacts they appear for example in works of literature, in games and on television and for migrant children they can provide links with countries of origin.</p>


2021 ◽  
Author(s):  
◽  
Paulette Holland

<p>In the New Zealand National Curriculum maps are defined as an essential skill along with graphs and tables. Despite the widespread use of maps in everyday life and their incorporation in more than one area of the curriculum there has been little research in New Zealand on children’s knowledge of maps, their use and where and how children encounter them. The research reported in this thesis is an attempt to broaden our understanding of young school children’s knowledge of maps and in particular the sources of their map knowledge in family, neighbourhood and school. The study was informed by two bodies of work, that of Fay Panckhurst on preschoolers’ map knowledge and its sources, and the NEMP studies which assessed graphs, tables and maps at Years 4 and 8. From a Decile 2 school, a sample of Year 3 & 4 children was selected before they had been introduced to maps at school. The students were interviews individually. Each was asked to select the maps from a collection, which included graphs and tables. The selection task showed that the students knew what maps were but had trouble recognising graphs or tables. The students then answered a set of questions about maps, and drew a map of New Zealand marking it on a number of locations. Over a period of three weeks their classroom teacher taught a unit on maps. The sample students were then interviewed again. While their original answers showed the influence of maps in homes and neighbourhood the classroom unit had provided them with technical knowledge and map language, and their maps of New Zealand improved in relation to shape, relationship of the islands, and knowledge of locations. It is argued that maps are not solely “skills” but as cultural artefacts they appear for example in works of literature, in games and on television and for migrant children they can provide links with countries of origin.</p>


2021 ◽  
Vol 71 (2) ◽  
pp. 167-178
Author(s):  
Magdolen Ľuboš ◽  
Danko Ján ◽  
Milesich Tomáš ◽  
Nemec Tomáš ◽  
Sloboda Karol ◽  
...  

Abstract Reducing emissions brings changes in the design of internal combustion engines and thus new challenges for dual-mass flywheels (DMF) in terms of Noise Vibration and Harshness (NVH). The first part of the article describes a simple model of a centrifugal pendulum. Consequently, a more complicated DMF dynamic model involves friction between the spring components. The second part of the article deal with the multibody model of DMF using a CAD model. The dynamic model consists of a torsion spring and two bodies. The model is compared with the experimental method, which is also described in the paper.


Elements ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 59-65
Author(s):  
Michael Hayley

J.R.R. Tolkien's beloved Lord of the Rings has been considered one of the greatest works of English literature. This work analyzes Tolkien's inspiration and motivation in his writing process by situation middle-earth in the context of postwar England. Evaluation Tolkien's letters reveal his affinity for Arthurian legend, and his desire to reinvent it to create a myth that was distinctly English. A comparison of the two bodies of legend reveals similar Archetypal elements and characterizations that give Tolkien's legendarium credibility and weight. Through Sauron's destruction of middle-earth, Tolkien reveals his concerns for a modern, industrialized England and the consequences of war. In The Lord of the Rings, Tolkien reinvents the legend of Arthur into a synthesis of English national identity and exigency for the future. 


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