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    Tytuł:
    J$\text{}_{1}$-J$\text{}_{2}$-J$\text{}_{3}$ Model with Long-Range Lieb-Mattis Interaction
    Autorzy:
    Krüger, S. E.
    Richter, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955533.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    Opis:
    Stimulated by the two-dimensional frustrated Heisenberg antiferromagnet with first-, second-, and third-neighbor couplings (J$\text{}_{1}$-J$\text{}_{2}$-J$\text{}_{3}$ model) we consider a corresponding three-parameter model with a long-range antiferromagnetic Lieb-Mattis interaction. This model can be solved exactly and leads to a better understanding of the role of frustration in the J$\text{}_{1}$-J$\text{}_{2}$-J$\text{}_{3}$ model. We calculate the correlations in the groundstate and consider their finite size behavior. Furthermore we present the full thermodynamic phase diagram. We find the possibility of a disordered phase at T=0.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 377-380
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lieb-Mattis Model for Two Interpenetrating Antiferromagnets
    Autorzy:
    Schmalfuss, D.
    Krüger, S. E.
    Richter, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2012975.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    Opis:
    We investigate a frustrated Lieb-Mattis-like spin-1/2 model that is a reference model for the corresponding square-lattice Heisenberg model describing the unusual magnetic properties of Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{4}$Cl$\text{}_{2}$. Due to frustration we obtain a rich magnetic phase diagram. We find two critical temperatures in accordance with recent experiments on Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{4}$Cl$\text{}_{2}$.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 377-380
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagonalization of a Bosonic Quadratic Form Using CCM: Application on a System with Two Interpenetrating Square Lattice Antiferromagnets
    Autorzy:
    Krüger, S. A.
    Schmalfuss, D.
    Richter, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013979.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ee
    75.30.Ds
    31.15.Dv
    42.50.Lc
    Opis:
    While the diagonalization of a quadratic bosonic form can always be done using a Bogolyubov transformation, the practical implementation for systems with a large number of different bosons is a tedious analytical task. Here we use the coupled cluster method to exactly diagonalise such complicated quadratic forms. This yields to a straightforward algorithm which can easily be implemented using computer algebra even for a large number of different bosons. We apply this method on a Heisenberg system with two interpenetrating square lattice antiferromagnets, which is a model for the quasi-2D antiferromagnet Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{4}$Cl$\text{}_{2}$. Using a four-magnon spin wave approximation we get a complicated Hamiltonian with four different bosons, which is treated with coupled cluster method. Results are presented for magnetic ground state correlations.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 951-954
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Warm waters of summer 2002 in the deep Baltic Proper
    Autorzy:
    Feistel, R.
    Nausch, G.
    Mohrholz, V.
    Lysiak-Pastuszak, E.
    Seifert, T.
    Matthaus, W.
    Kruger, S.
    Hansen, I.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/47540.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    temperature
    hydrography
    inflow
    warm water
    summer
    salinity
    Baltic Sea
    oxygen condition
    Opis:
    From October 2002 until March 2003 surprisingly warm, oxygenated waters were frequently encountered in the Baltic Sea in the area between the Bornholm and Fårö Deeps from the halocline down to the bottom. Owing to their ventilation effect in the stagnating deep waters, their occasional observations have partly been incorrectly attributed to the inflow events of October 2002 or January 2003. The emergence of some of these waters can be traced back to the exceptional summer weather conditions in August and September 2002 in central Europe. The warm waters played a remarkable renewal pacemaker role for the subsequent important winter inflow of January 2003. The evolution of this summer inflow is described and possible causes are discussed.
    Źródło:
    Oceanologia; 2003, 45, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeoneurology and palaeobiology of the dinocephalian therapsid Anteosaurus magnificus
    Autorzy:
    Benoit, J.
    Kruger, A.
    Jirah, S.
    Fernandez, V.
    Rubidge, B.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082279.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Therapsida
    Dinocephalia
    head-butting
    carnivory
    trigeminal nerve
    bony labyrinth
    Opis:
    Dinocephalians (Therapsida), some of the earliest amniotes to have evolved large body size, include the carnivorous Anteosauria and mostly herbivorous Tapinocephalia. Whilst the palaeoneurology of the Tapinocephalia has been investigated in Moschognathus whaitsi, that of the Anteosauria remains completely unknown. Here we used X-ray micro-Computed Tomography to study, for the first time, the palaeoneurology of Anteosaurus magnificus. Compared to Moschognathus, we reconstruct Anteosaurus as an agile terrestrial predator based on the enlarged fossa for the floccular lobe of the cerebellum and semicircular canals of the inner ear. A major difference between the two genera resides in the orientation of the braincase, as indicated by the angle between the long axis of the skull and the plane of the lateral semicircular canal. This angle is 25° in Anteosaurus, whereas it is 65° in Moschognathus, which suggests that the braincase of the latter was remodelled as an adaptation to head-butting. This is consistent with less cranial pachyostosis and the retention of a large canine in Anteosauria, which suggests that dentition may have been used for intraspecific fighting and display in addition to trophic interactions. The evolution of a thick skull, horns, and bosses in tapinocephalids parallels the evolutionary reduction of the canine, which lead to a shift of the agonistic function from the mouth to the skull roof, as observed in extant social ungulates. Similarly, tapinocephalians may have developed complex social behaviour.
    Źródło:
    Acta Palaeontologica Polonica; 2021, 66, 1; 29-39
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is downer cow syndrome related to chronic botulism?
    Autorzy:
    Rulff, R.
    Schrodl, W.
    Basiouni, S.
    Neuhaus, J.
    Kruger, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/30507.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The present work was directed to investigate the relationship between Downer cow syndrome (DCS) and chronic botulism in dairy cattle. For this purpose, a total of 52 fresh calving downer cows and 206 apparently healthy cows at 14 dairy farms were investigated for Clostridium botulinum ABE and CD antibody levels, C. botulinum and botulinum neurotoxin in rumen fluids as well as in faeces. Results indicated that the downer cows had higher IgG titers for C. botulinum ABE and CD than the healthy cows. All tested rumen fluids were negative for BoNT and C. botulinum. BoNT/D, however, and C. botulinum type D spores were detected in faecal samples of healthy and downer cows in the selected farms. In conclusion, the presence of a significantly higher C. botulinum ABE and CD antibody levels in DCS cows than in the healthy animals suggests that chronic C. botulinum toxico-infection could be a predisposing factor for DCS.
    Źródło:
    Polish Journal of Veterinary Sciences; 2015, 18, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manoeuvring areas to adapt ACAS for the maritime domain
    Autorzy:
    Baldauf, M.
    Mehdi, R.
    Deeb, H.
    Schröder-Hinrichs, J. U.
    Benedict, K.
    Krüger, C.
    Fischer, S.
    Gluch, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/135052.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    situation-dependent analysis
    risk assessment
    risk of collision
    collision probability
    prediction of manoeuvring areas
    potential areas of water
    fast time simulation
    Opis:
    Rapidly increasing numbers of ships and ship sizes pose an ever-growing challenge to the maritime industry. Although statistics indicate improved levels of safety in the industry which carries 90% of the world’s trade, the risk of navigational accidents, among other issues, remains a prime concern and priority (EMSA, 2010; 2014). In order to address these concerns, the authors turned to another high-risk industry for inspiration. Specifically, they turned to the aviation industry, which has often been used as a source of comparisons and ideas by researchers in the maritime domain. Keeping up with the trend, the authors of this paper turn to a tried-and-tested system used widely in modern aviation: the Airborne Collision Avoidance System (ACAS). The prime idea behind ACAS is to construct two virtual 3D zones around an aircraft. These zones are dynamic, and depend on the manoeuvring characteristics of a given aircraft. If the system detects an “intruder” (another aircraft) in either of the two well-defined virtual zones, it provides warnings and/or instructions to pilots of both aircraft to take certain precautionary or emergency measures. In the current paper, the authors explore whether or not such a system is feasible for use in the maritime domain and, if so, how. The paper provides a detailed analysis of the potential benefits and drawbacks of using an ACAS-like system onboard vessels. It also discusses possible means of implementation and integration with current equipment, and explores how the introduction of e-navigation may impact the proposed solution.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 39-47
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study between Poland and South Africa wind climates, the related damage and implications of adopting the eurocode for wind action on buildings
    Autorzy:
    Goliger, A.
    Żurański, J.
    Giżejowski, M.
    Gaczek, M.
    Retief, J.
    Kruger, A.
    Dunaiski, P.
    Fiszer, S.
    Ćwik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/231003.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    warunki wiatrowe
    szkoda wiatrowa
    obciążenie wiatrem
    projektowanie konstrukcji
    norma
    wind climate
    wind damage
    wind loading
    structural design
    standard
    Opis:
    Wind constitutes one of the major environmental factors affecting the design and performance of built environment. Each country has its unique climatic wind conditions, and the way in which these are considered and implemented in the structural design, is important. An implementation or adoption of any new engineering design stipulations introduces a formidable challenge to the developers of the standards and the design profession. This has been experienced in some of the countries (e.g. the UK, Australia and the USA), where processes of modernising the outdated codification took place in the past. Although both Poland and South Africa are currently at the early implementation stage of the new wind loading design stipulations, there is a major difference between the circumstances of the two countries. Poland, as an EU member state, has a compulsory obligation to adopt the new uniform standarisation requirements, within a stipulated time-frame. The South African code developers, after a thorough investigation process which will be highlighted in the paper, decided voluntarily to adopt the Eurocode as the primary model document.
    Źródło:
    Archives of Civil Engineering; 2013, 59, 1; 51-95
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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