9 research outputs found
Is socialist realism (de)colonial? Or how to re-appropriate the spirit of the gift, in: Communist/Soviet Historical and Cultural Heritage. Collection of Articles
Monte Carlo study of phase separation in magnetic insulators
In this work we focus on the study of phase separation in the zero-bandwidth
extended Hubbard with nearest-neighbors intersite Ising-like magnetic
interactions and on-site Coulomb interactions . The system has been
analyzed by means of Monte Carlo simulations (in the grand canonical ensemble)
on two dimensional square lattice (with sites) and the
results for as a function of chemical potential and electron
concentration have been obtained. Depending on the values of interaction
parameters the system exhibits homogeneous (anti-)ferromagnetic (AF) or
non-ordered (NO) phase as well as phase separation PS:AF/NO state. Transitions
between homogeneous phases (i.e. AF-NO transitions) can be of first or second
order and the tricritical point is also present on the phase diagrams. The
electron compressibility is an indicator of the phase separation and that
quantity is of particular interest of this paper.Comment: 4 pages, 3 figures; pdf-ReVTeX; updated references; presented at The
European Conference PHYSICS OF MAGNETISM 2014 (PM'14), June 23-27, 2014,
Poznan, Poland; submitted to Acta Physica Polonica
Some properties of two dimensional extended repulsive Hubbard model with intersite magnetic interactions - a Monte Carlo study
In this paper the two dimensional extended Hubbard model with intersite
magnetic Ising-like interaction in the atomic limit is analyzed by means of the
classical Monte Carlo method in the grand canonical ensemble. Such an effective
simple model could describe behavior of insulating (anti)ferromagnets. In the
model considered the Coulomb interaction () is on-site and the magnetic
interactions in -direction (, antiferromagnetic) are restricted to
nearest-neighbors. Simulations of the model have been performed on a square
lattice consisting of sites () in order to obtain the
full phase diagram for . Results obtained for on-site repulsion
() show that, apart from homogeneous non-ordered (NO) and ordered magnetic
(antiferromagnetic, AF) phases, there is also a region of phase separation (PS:
AF/NO) occurrence. We present a phase diagram as well as some thermodynamic
properties of the model for the case of (and arbitrary chemical
potential and arbitrary electron concentration). The AF-NO transition can be
second-order as well as first-order and the tricritical point occurs on the
diagram.Comment: 5 pages, 4 figures, pdf-ReVTeX, presented at 16th National School of
Superconductivity: Unconventional superconductivity and strongly correlated
systems, Zakopane, Poland, October 7-12, 2013, submitted to Acta Physica
Polonica
On the phase diagram of the zero-bandwidth extended Hubbard model with intersite magnetic interactions for strong on-site repulsion limit
This is an author-created, un-copyedited version of an article accepted for publication in Acta Physica Polonica A.
The Version of Record is available online at http://przyrbwn.icm.edu.pl/APP/PDF/121/a121z5p13.pdfIn this report we have analyzed a simple effective model for a description of magnetically ordered insulators. The Hamiltonian considered consists of the effective on-site interaction (U) and the intersite Ising-like magnetic exchange interaction (J) between nearest neighbors. For the first time the phase diagrams of this model have been determined within Monte Carlo simulation on 2D-square lattice. They have been compared with results obtained within variational approach, which treats the on-site term exactly and the intersite interactions within mean-field approximation. We show within both approaches that, depending on the values of interaction parameters and the electron concentration, the system can exhibit not only homogeneous phases: (anti-)ferromagnetic (F) and nonordered (NO), but also phase separated states (PS: F-NO).National Science Center (NCN) as a research project in years 2011-2013, under grant No. DEC-2011/01/N/ST3/00413;
European Commission and Ministry of Science and Higher Education (Poland) - partial financial support from European Social Fund – Operational Programme "Human Capital" – POKL.04.01.01-00-133/09-00 – "Proinnowacyjne kształcenie, kompetentna kadra, absolwenci przyszłości"
Making Pyramids Disappear: Faux Horizontalism and Wild Capitalist Topologies of Speculations
Engaging with the question of speculation in ways that encompass the artistic, the economic, and the philosophical, with excursions into the literary and the scientific, this collection approaches the theme as a powerful logic of ..
Research on BNCT in Poland and in the world
Przy Reaktorze MARIA w Narodowym Centrum Badań Jądrowych
(NCBJ) powstaje stanowisko do badań nad terapią
borowo-neutronową (BNCT). Terapia polega na napromienianiu
nowotworu wiązką neutronów o odpowiednich parametrach po
uprzednim podaniu pacjentowi związku boru, który w wyniku
określonych mechanizmów gromadzi się głównie w komórkach
rakowych. W wyniku reakcji 10B(n,α)7Li emitowane są cząstki
jonizujące powodujące zniszczenie tylko tych komórek, w których
zgromadzony jest bor [1]. Badania kliniczne prowadzone
na świecie potwierdzają skuteczność metody, otwierając nowe
perspektywy dla jej zastosowania w terapii konwencjonalnej.The stand for research on Boron Neutron Capture Therapy
(BNCT) at the MARIA Reactor at the National Centre for
Nuclear Research is being created. The therapy consists of irradiation
of the tumour with a neutron beam with specific parameters
after prior administration of the boron compound to the
patient, which accumulates mainly in cancer cells as a result of
specific mechanisms. As a result of 10B(n,α)7Li reaction, ionising
particles are emitted and destroy only those cells, in which boron
is accumulated. Clinical trials conducted in the world show
relatively high efficiency of BNCT, opening new perspectives for
its use in conventional therapy
The Prevalence of Cardiovascular Risk Factors among Polish Soldiers: The Results from the MIL-SCORE Program
The MIL-SCORE (Equalization of Accessibility to Cardiology Prophylaxis and Care for Professional Soldiers) program was designed to assess the prevalence and management of cardiovascular risk factors in a population of Polish soldiers. We aimed to describe the prevalence of cardiovascular risk factors in the MIL-SCORE population with respect to age. This observational cross-sectional study enrolled 6440 soldiers (97% male) who underwent a medical history, physical examination, and laboratory tests to assess cardiovascular risk. Almost half of the recruited soldiers were past or current smokers (46%). A sedentary lifestyle was reported in almost one-third of those over 40 years of age. The prevalence of hypertension in a subgroup over 50 years of age was almost 45%. However, the percentage of unsatisfactory blood pressure control was higher among soldiers below 40 years of age. The prevalence of overweight and obese soldiers increased with age and reached 58% and 27%, respectively, in those over 50 years of age. Total cholesterol was increased in over one-half of subjects, and the prevalence of abnormal low-density lipoprotein cholesterol was even higher (60%). Triglycerides were increased in 36% of soldiers, and low high-density lipoprotein cholesterol and hyperglycemia were reported in 13% and 16% of soldiers, respectively. In the >50 years of age subgroup, high and very high cardiovascular risk scores were observed in almost one-third of soldiers. The relative risk assessed in younger subgroups was moderate or high. The results from the MIL-SCORE program suggest that Polish soldiers have multiple cardiovascular risk factors and mirror trends seen in the general population. Preventive programs aimed at early cardiovascular risk assessment and modification are strongly needed in this population
MARIA Reactor Irradiation Technology Capabilities towards Advanced Applications
The MARIA research reactor is designed and operated as a multipurpose nuclear installation, combining material testing, neutron beam experiments, and medical and industrial radionuclide production, including molybdenum-99 (99Mo). Recently, after fuel conversion to LEU and rejuvenation of the staff while maintaining their experience, MARIA has been used to respond to the increased interest of the scientific community in advanced nuclear power studies, both fission and fusion. In this work, we would like to introduce MARIA’ s capabilities in the irradiation technology field and how it can serve future nuclear research worldwide