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Search Results: 1 - 10 of 403174 matches for " M. Sowiński "
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Orbital physics of polar Fermi molecules
O. Dutta,T. Sowiński,M. Lewenstein
Physics , 2012, DOI: 10.1103/PhysRevA.87.023619
Abstract: We study a system of polar dipolar fermions in a two-dimensional optical lattice and show that multi-band Fermi-Hubbard model is necessary to discuss such system. By taking into account both on-site, and long-range interactions between different bands, as well as occupation-dependent inter- and intra-band tunneling, we predict appearance of novel phases in the strongly-interacting limit.
Two diagnoses become one? Rare case report of anorexia nervosa and Cushing’s syndrome
Sawicka N,Gryczyńska M,Sowiński J,Tamborska-Zedlewska M
Neuropsychiatric Disease and Treatment , 2013,
Abstract: Nadia Sawicka,* Maria Gryczyńska,* Jerzy Sowiński, Monika Tamborska-Zedlewska, Marek Rucha a Department of Endocrinology, Metabolism and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland*These authors contributed equally to this workAbstract: Hypothalamic-pituitary-adrenal axis impairment in anorexia nervosa is marked by hypercortisolemia, and psychiatric disorders occur in the majority of patients with Cushing’s syndrome. Here we report a patient diagnosed with anorexia nervosa who also developed Cushing’s syndrome. A 26-year-old female had been treated for anorexia nervosa since she was 17 years old, and also developed depression and paranoid schizophrenia. She was admitted to the Department of Endocrinology, Metabolism, and Internal Medicine with a preliminary diagnosis of Cushing’s syndrome. Computed tomography revealed a 27 mm left adrenal tumor, and she underwent laparoscopic adrenalectomy. She was admitted to hospital 6 months after this procedure, at which time she did not report any eating or mood disorder. This is a rare case report of a patient with anorexia nervosa in whom Cushing’s syndrome was subsequently diagnosed. Diagnostic difficulties were caused by the signs and symptoms presenting in the course of both disorders, ie, hypercortisolemia, osteoporosis, secondary amenorrhea, striae, hypokalemia, muscle weakness, and depression.Keywords: anorexia nervosa, Cushing’s syndrome, adrenalectomy, osteoporosis
Quantum phase transition in a shallow one-dimensional optical lattice
Tomasz Sowiński
Physics , 2015, DOI: 10.1364/JOSAB.32.000670
Abstract: In this article the extended Bose-Hubbard model describing ultra-cold atoms confined in a shallow, one-dimensional optical lattice is introduced and studied by the exact diagonalization approach. All parameters of the model are related to the only relevant parameter controlled experimentally -- the depth of the optical potential. Changes in a shape of the insulating lobe in the phase diagram of the system are explored and the value of the critical tunneling for which the system undergoes the phase transition (from the insulating to the superfluid phase) is predicted. It is shown that the value of critical tunneling is substantially affected by the presence of the tunnelings to distant sites of the optical lattice. The results may have some importance in upcoming experiments on quantum quench through phase transition points.
Slightly imbalanced system of a few attractive fermions in a one-dimensional harmonic trap
Tomasz Sowiński
Physics , 2015, DOI: 10.1007/s00601-015-1017-5
Abstract: The ground-state properties of the two-flavored mixture of a few attractive fermions confined in a one-dimensional harmonic trap is studied. It is shown that for slightly imbalanced system the pairing between fermions of opposite spins has completely different features that in the balanced case. The fraction of correlated pairs is suppressed by the presence of additional particle and another uncorrelated two-body orbital dominates in the ground-state of the system.
One-dimensional Bose-Hubbard model with pure three-body interactions
Tomasz Sowiński
Physics , 2013, DOI: 10.2478/s11534-014-0481-8
Abstract: The extended Bose-Hubbard model with pure three-body local interactions is studied using the Density Matrix Renormalization Group approach. The shapes of the first two insulating lobes are discussed, and the values of the critical tunneling for which the system undergoes the quantum phase transition from insulating to superfluid phase are predicted. It is shown that stability of insulating phases, in contrast to the standard Bose-Hubbard model, is enhanced for larger fillings. It is also shown that, on the tip of the boundary of the insulating phase, the model under consideration belongs to the Berenzinskii-Kosterlitz-Thouless universality class.
Ground-state entanglement of spin-1 bosons undergoing superexchange interactions in optical superlattices
Artur Barasiński,Wies?aw Leoński,Tomasz Sowiński
Physics , 2014,
Abstract: We discuss a model with ultra-cold atoms confined in optical superlattices. In particular, we study the ground-state properties of two spin-1 bosons trapped in a double-well potential. Depending on the external magnetic field and biquadratic interactions different phases of magnetic order are realized. Applying von Neumann entropy and number of relevant orbitals, we quantify the bipartite entanglement between particles. Changing the values of the parameters determining superlattices, we can switch the system between differently entangled states.
Mean-field approaches to the Bose-Hubbard model with three-body local interaction
Tomasz Sowiński,Ravindra W. Chhajlany
Physics , 2014, DOI: 10.1088/0031-8949/2014/T160/014038
Abstract: The zero temperature properties of the generalized Bose-Hubbard model including three-body interactions are studied on a mean-field level. We obtain analytical results using the so-called perturbative mean-field method and more detailed numerical results using the Gutzwiller product state variational Ansatz. These two approaches yield equivalent results which compare well on a qualitative level with recent exact results obtained in the literature.
Ocena wp ywu krótkotrwa ej, g bokiej niedoczynno ci tarczycy na funkcj skurczow i rozkurczow serca
Andrzej Minczykowski,Katarzyna Ziemnicka,Jerzy Sowiński,Henryk Wysocki
Polish Journal of Cardiology , 2005,
Abstract: Wprowadzenie: Hormony tarczycowe dzia aj na funkcje serca bezpo rednio, zwi kszaj c jego kurczliwo i cz sto skurczów, oraz po rednio - przez zmniejszenie obwodowego oporu naczyniowego. Pacjenci po ca kowitej tyreoidektomii z powodu raka tarczycy stanowi bardzo dobry model do badania wp ywu nagle pojawiaj cej niedoczynno ci tarczycy na uk ad kr enia. Cel pracy: Postanowiono zbada wp yw g bokiej niedoczynno ci tarczycy na budow i funkcj skurczow i rozkurczow serca wykorzystuj c techniki echokardiograficzne. Materia i metodyka: 18 pacjentów po tyreoidektomii z powodu raka tarczycy (wiek 45,4±12 lat, 16 kobiet), u których terapi substytucyjn L-tyroksyn przerwano w celu przeprowadzenia scyntygrafii ca ego cia a, poddano badaniu echokardiograficznemu. Badanie przeprowadzono przed przywróceniem terapii L-tyroksyn oraz po rednio 5,5 miesi cach terapii L-tyroksyn . Wyniki: W pierwszym badaniu poziom hormonów tarczycowych by znacznie ni szy od warto ci prawid owych, a poziom TSH wyra nie podwy szony, co potwierdza o ci k niedoczynno tarczycy. Podczas drugiego badania, rednio po 5,5 miesi cach terapii L-tyroksyn , st enia hormonów tarczycowych mie ci y si w górnych granicach normy. Nie zanotowano zmian grubo ci cian oraz wymiaru rozkurczowego lewej komory po terapii T4, stwierdzono natomiast wzrost skurczowego przyrostu grubo ci cian lewej komory (przegroda mi -dzykomorowa z 27,1 ±10,3% do 36,4±12,3%, p<0,05 oraz tylna ciana z 33,5±14,6% do 42,9±18,6%, p<0,05). Pod wp ywem terapii L-tyroksyn frakcja wyrzutowa wzros a z 57 ± 12% do 65±5% (p<0,001), a rzut minutowy serca z 3734±655 do 4400±866 ml/min (p<0,001). Czynno skurczowa lewej komory badana na poziomie ród ciennym równie uleg a znacznej poprawie - ród cienna frakcja skracania (MWS) wzros a z 10,4±2,9%do 12,9±2,6%(p<0,001), natomiast skorygowana warto ci napr enia MWS {stress-cor-rected MWS) wzros a z 60,8± 17% do 80,2±19,6% (p<0,001). Wska nik masy lewej komory nie zmieni si istotnie statystycznie. Przywrócenie terapii L-tyroksyn wi za o si z redukcj systemowego oporu obwodowego i wzrostem końcowo-skurczowego napr enia okr nego lewej komory (cESS). Podczas drugiego badania stwierdzono wzrost wszystkich pr dko ci fal nap ywu mitralnego i ylnego nap ywu p ucnego oraz zmniejszenie stosunku fal E/A. Czas rozkurczu izowolumetrycznego (IVRT) lewej komory i pr dko propagacji wczesnej fali nap ywu mitralnego nie zmieni y si w porównaniu z badaniem przeprowadzonym w czasie niedoczynno ci tarczycy. Wska nik sprawno ci serca (wska nik Tei, MPI), obliczany jako stosunek su
Why Movement Is Captured by Music, but Less by Speech: Role of Temporal Regularity
Simone Dalla Bella, Anita Bia?uńska, Jakub Sowiński
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0071945
Abstract: Music has a pervasive tendency to rhythmically engage our body. In contrast, synchronization with speech is rare. Music’s superiority over speech in driving movement probably results from isochrony of musical beats, as opposed to irregular speech stresses. Moreover, the presence of regular patterns of embedded periodicities (i.e., meter) may be critical in making music particularly conducive to movement. We investigated these possibilities by asking participants to synchronize with isochronous auditory stimuli (target), while music and speech distractors were presented at one of various phase relationships with respect to the target. In Exp. 1, familiar musical excerpts and fragments of children poetry were used as distractors. The stimuli were manipulated in terms of beat/stress isochrony and average pitch to achieve maximum comparability. In Exp. 2, the distractors were well-known songs performed with lyrics, on a reiterated syllable, and spoken lyrics, all having the same meter. Music perturbed synchronization with the target stimuli more than speech fragments. However, music superiority over speech disappeared when distractors shared isochrony and the same meter. Music’s peculiar and regular temporal structure is likely to be the main factor fostering tight coupling between sound and movement.
Two-flavor mixture of a few fermions of different mass in a one-dimensional harmonic trap
Daniel P?cak,Mariusz Gajda,Tomasz Sowiński
Physics , 2015,
Abstract: A system of two species of fermions of different mass confined in a one-dimensional harmonic trap is studied with an exact diagonalization approach. It is shown independently on the number of particles that a mass difference between fermionic species induces a separation in the lighter flavor system. The mechanism of emerging of separated phases is explained phenomenologically and confirmed with the help of a direct inspection of the ground-state of the system. Finally, it is shown that the separation driven by a mass difference, in contrast to the separation induced by a difference of populations, is robust to the interactions with thermal environment.
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