Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Krzysztof Andrzejewski"'
Publikováno v:
Chirurgia Narządów Ruchu i Ortopedia Polska, Vol 89, Iss 1, Pp 31-35 (2024)
A 25-year-old man with a hip dislocation and Pipkin II type femoral head fracture, whose surgical treatment was postponed for 15 days due to Covid 19 pandemic, is described. For 2 months after surgery, treatment was supported by therapy in a hyperbar
Externí odkaz:
https://doaj.org/article/f1e6cfc3c89542ae9c4e59ce1161032d
Publikováno v:
Nuclear Physics B, Vol 994, Iss , Pp 116327- (2023)
Beginning with a simple set of planar equations, we discuss novel realizations of the Pais-Uhlenbeck oscillator in various contexts. First, due to the bi-Hamiltonian character of this model, we develop a Hamiltonian approach for the Eisenhart-Duval l
Externí odkaz:
https://doaj.org/article/145b3527e3e04fbe87786faa8e2e1bb6
Autor:
Krzysztof Andrzejewski, Marcin Domżalski, Piotr Komorowski, Jan Poszepczyński, Bożena Rokita, Marcin Elgalal
Publikováno v:
Diagnostics, Vol 13, Iss 15, p 2516 (2023)
Background. In revision hip arthroplasty (RHA), establishing the center of rotation (COR) can be technically challenging due to the acetabular bone destruction that is usually present, particularly in severe cases such as Paprosky type II and III def
Externí odkaz:
https://doaj.org/article/ae1d0c0fb912485b85b307e5ce4c0557
Publikováno v:
Nuclear Physics B, Vol 975, Iss , Pp 115664- (2022)
The extensive analysis of the dynamics of relativistic spinning particles is presented. Using the coadjoint orbits method the Hamiltonian dynamics is explicitly described. The main technical tool is the factorization of general Lorentz transformation
Externí odkaz:
https://doaj.org/article/aa87480a3acb4f13bdd24cd73c9a5e59
Milk Formula Enriched with Sodium Butyrate Influences Small Intestine Contractility in Neonatal Pigs
Autor:
Monika Słupecka-Ziemilska, Stefan Grzegorz Pierzynowski, Paulina Szczurek, Kateryna Pierzynowska, Piotr Wychowański, Blanka Seklecka, Maciej Koperski, Anna Starzyńska, Dominika Szkopek, Janine Donaldson, Krzysztof Andrzejewski, Jarosław Woliński
Publikováno v:
Nutrients, Vol 14, Iss 20, p 4301 (2022)
Butyrate, a by-product of gut bacteria fermentation as well as the digestion of fat in mother’s milk, exerts a wide spectrum of beneficial effects in the gastrointestinal tissues. The present study aimed to determine the effects of sodium butyrate
Externí odkaz:
https://doaj.org/article/2443f95ec4ac4cdca72ed55319e0d979
Autor:
Krzysztof Andrzejewski, Marcin Elgalal, Piotr Komorowski, Jan Poszepczyński, Bożena Rokita, Marcin Domżalski
Publikováno v:
Applied Sciences, Vol 12, Iss 7, p 3492 (2022)
Background. Preoperative planning and 3D printing can be used to treat pelvic bone fractures using pre-contoured surgical plates, in particular complex, comminuted fractures involving the acetabulum and quadrilateral plate. The aim of the study was t
Externí odkaz:
https://doaj.org/article/d39e400e93e044fc92a6c771b4b66589
Autor:
Krzysztof Andrzejewski
Publikováno v:
Nuclear Physics B, Vol 901, Iss C, Pp 216-228 (2015)
We extend, to the quantum domain, the results obtained in [Nucl. Phys. B 885 (2014) 150] and [Phys. Lett. B 738 (2014) 405] concerning Niederer's transformation for the Pais–Uhlenbeck oscillator. Namely, the quantum counterpart (an unitary operator
Externí odkaz:
https://doaj.org/article/38c35e295db14c5194c95dede1fb8c35
Publikováno v:
Physics Letters B, Vol 746, Iss , Pp 417-423 (2015)
The coadjoint orbit method is applied to the construction of Hamiltonian dynamics of massless particles of arbitrary helicity. The unusual transformation properties of canonical variables are interpreted in terms of nonlinear realizations of Poincare
Externí odkaz:
https://doaj.org/article/9594e41f65504f22ad5cbed02a17e17f
Autor:
Krzysztof Andrzejewski
Publikováno v:
Nuclear Physics B, Vol 889, Iss C, Pp 333-350 (2014)
The study of the symmetry of Pais–Uhlenbeck oscillator initiated in Andrzejewski et al. (2014) [24] is continued with special emphasis put on the Hamiltonian formalism. The symmetry generators within the original Pais and Uhlenbeck Hamiltonian appr
Externí odkaz:
https://doaj.org/article/b85ba5039a0f4b528f018f041ac6e253
Autor:
Krzysztof Andrzejewski
Publikováno v:
Physics Letters B, Vol 738, Iss , Pp 405-411 (2014)
Dynamical systems invariant under the action of the l-conformal Newton–Hooke algebras are constructed by the method of nonlinear realizations. The relevant first order Lagrangians together with the corresponding Hamiltonians are found. The relation
Externí odkaz:
https://doaj.org/article/67857762e3c9490892a5189d0a1224f5