Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Christian Herbig"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 9, Pp 1-10 (2022)
Abstract The field equations are proposed for the third rank tensor field with the hook Young diagram. The equations describe the irreducible spin two massless representation in any $$d\ge 3$$ d ≥ 3 . The starting point of the construction is the l
Externí odkaz:
https://doaj.org/article/2b1d7a5c92034791b49b5148dc7daf68
Autor:
Armin Kueck, Andreas Hohl, Cord Schepelmann, Sui-Long Lam, Dennis Heinisch, Christian Herbig, Vincent Kulke, Georg-Peter Ostermeyer, Hanno Reckmann, Volker Peters
Publikováno v:
Day 3 Wed, May 04, 2022.
The push in the drilling industry for drilling longer wells, and faster and more difficult trajectories leads to increasing challenges with the dynamics of the drilling systems in particular in expensive high end offshore wells. Dynamic effects are m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6de62497afacccd4644d55a6b3c4450d
https://doi.org/10.4043/31917-ms
https://doi.org/10.4043/31917-ms
Publikováno v:
International Journal of Algebra and Computation. 30:1323-1357
We compute the Hilbert series of the graded algebra of real regular functions on the symplectic quotient associated to an [Formula: see text]-module and give an explicit expression for the first nonzero coefficient of the Laurent expansion of the Hil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b14a1031684ca742f69ce30f26225e3
https://doi.org/10.1142/s0218196720500435
https://doi.org/10.1142/s0218196720500435
Let $n\ge 1$ and $A$ be a commutative algebra of the form $\boldsymbol k[x_1,x_2,\dots, x_n]/I$ where $\boldsymbol k$ is a field of characteristic $0$ and $I\subseteq \boldsymbol k[x_1,x_2,\dots, x_n]$ is an ideal. Assume that there is a Poisson brac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b77b0f402557b28a17668b35ac7c0101
Autor:
Georg-Peter Ostermeyer, Andreas Hohl, Vincent Kulke, Christian Herbig, Hanno Reckmann, Armin Kueck, Dennis Heinisch
Publikováno v:
Day 3 Thu, November 19, 2020.
Vibrations impact the drilling process by reducing reliability, increasing maintenance costs and reducing rate of penetration and drilling efficiency. Herein, torsional vibrations are typically distinguished into low-frequency torsional oscillations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7e376ae9de6bb9b993b30bf0427a56b
https://doi.org/10.2118/202342-ms
https://doi.org/10.2118/202342-ms
We compute the Hilbert series of the graded algebra of real regular functions on a linear symplectic quotient by the $2$-torus as well as the first four coefficients of the Laurent expansion of this Hilbert series at $t = 1$. We describe an algorithm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42a25de397ad9f880ff81279844f5ca8
http://arxiv.org/abs/2010.01708
http://arxiv.org/abs/2010.01708
Autor:
Georg-Peter Ostermeyer, Armin Kueck, Christian Herbig, Vincent Kulke, Hanno Reckmann, Andreas Hohl
Publikováno v:
Day 1 Tue, March 03, 2020.
The drilling process is impacted by vibrations through limited drilling efficiency and rate of penetration, reduced reliability and increased non-productive time. The understanding of the mechanisms and physics that lead to high levels of vibrations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::219d926c7038d865b938975d20daf9ce
https://doi.org/10.2118/199642-ms
https://doi.org/10.2118/199642-ms
Publikováno v:
Day 1 Mon, November 11, 2019.
Self-excited torsional vibrations of the bottomhole assembly (BHA) at frequencies above 50 Hz, so-called "high-frequency torsional oscillations" (HFTO), can damage drilling tools and can increase non-productive time (NPT). A recently developed HFTO-i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f6a0141bfbea4d6190ad37ca3e449c88
https://doi.org/10.2118/197409-ms
https://doi.org/10.2118/197409-ms
We identify a family of torus representations such that the corresponding singular symplectic quotients at the $0$-level of the moment map are graded regularly symplectomorphic to symplectic quotients associated to representations of the circle. For
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d88f379c01bfd95fb3bc5a074db3160
http://arxiv.org/abs/1903.09357
http://arxiv.org/abs/1903.09357
Publikováno v:
Symmetry, Integrability and Geometry: Methods and Applications, Vol 9, p 032 (2013)
We introduce the notion of regular symplectomorphism and graded regular symplectomorphism between singular phase spaces. Our main concern is to exhibit examples of unitary torus representations whose symplectic quotients cannot be graded regularly sy
Externí odkaz:
https://doaj.org/article/cd0c9b21eb2f46db90d933ac41b6d9be