time and place:

  • Wednesday at 12:30 p.m.,
  • room 106, in the Faculty of Mathematics and Physics (1. floor)

convener:

  • dr hab. prof. US Vincenzo Salzano
  • Next seminar: 29.5.19 - dr. hab. Pawel Tecmer

    Towards reliable modeling of electronic structures and spectroscopic parameters of actinide species

    Abstract: 

    In the first part of the talk we investigate electronic structures and electronic properties of uranyl-containing species using the state-of-the-art quantum chemistry approaches. First, we assess the accuracy of time-dependent density functional theory (TDDFT) for small model actinide compounds by comparison to more robust wave function-based methods. Second, we investigate the electronic structures and electronic spectra of ligated uranyl(VI) and uranyl(V) species. Furthermore, we investigate the electronic structures of two interacting uranyl(VI) and uranyl(V) subunits as well as those of the uranyl(VI) and uranyl(V) clusters. Our theoretical study elucidates the impact of cation–cation interactions on changes in the molecular structure as well as changes in vibrational and UV-Vis spectra of the bare uranyl(VI) and uranyl(V) moieties. This work is further extended to mixed uranyl-neptunyl clusters, which are more challenging from theoretical point of view.
    The second part of the talk is devoted to alternative (unconventional) electronic structure methods for actinides. Specifically, the focus is set on the Density Matrix Renormalization Group (DMRG) algorithm and the pair Coupled Cluster Doubles (pCCD) approach.
DATE SPEAKER TITLE
9.01.2019 Edyta Podlewska-Gaca Determination of physical parameters of asteroids.
16.01.2019 TBA
23.01.2019 TBA
30.01.2019 TBA
6.02.2019 TBA
13.02.2019 TBA
20.02.2019 TBA
27.02.2019 TBA
6.03.2019 TBA
13.03.2019 TBA
20.03.2019 TBA
27.03.2019 TBA
3.04.2019 Mariusz Dabrowski Classical and quantum multiverses
10.04.2019 TBA
17.04.2019 Filip Pratnicki Unoccupied natural orbitals in ground states of two-electron atoms and molecules
  • 8.5.19 - Dr. Vincenzo Salzano

    Extended Theories of Gravity in clusters of galaxies

    Abstract: After a (necessarily) short introduction about why and how General Relativity, assumed as the established consensus gravity theory, should be modified/extended, we will discuss the constraints we obtained for a particular class of Extended Theory of Gravity (technically defined as “Beyond Horndeski” and “Vainshtein-breaking” theory), using data from clusters of galaxies, both from X-ray observations and from gravitational lensing events.

  • 24.4.19 - Prof. Dr. Waclaw Gudowski (Royal Institute of Technology KTH, Stockholm and National Centre for Nuclear Research, Swierk)

    Nuclear Power – a vital component of environmental friendly energy supply mix in XXI century – new reactors, new solutions

    Abstract:

    Nuclear power has experienced an unprecedented, stormy development in 60’s and 70’s of the last century and then stagnated badly and became a very controversial energy source since the TMI accident (1979), then the Chernobyl sever accident (1986) and recently the Fukushima Daichi accident. In a shadow of those accidents a public fear related to use of nuclear power has grown making very difficult if not impossible rational discussion on future energy strategies. Moreover, in many countries, including Sweden, nuclear power became unwillingly and unnecessarily a very hot political issue. In many emotional public debates it is frequently forgotten that nuclear power is the most modern energy technology and it is one of very few options to save our planet from very serious man-made disasters like climate changes, energy related poverty etc.
    We scientists and experts in nuclear field have many „sines” to be blamed for. We neglected serious discussions within the expert communities, we neglected respectful and serious public communications and last but not least we neglected the fact that public has right to fear technology, which is not easy to understand and to master.
    Strangely enough many nations, which built their wealth on utilization of nuclear power and high energy consumption based on very rational and smart decisions of previous generations, are turning now against the nuclear power with not very rational and technically sound arguments, forgetting that secure and environmental friendly energy supply is one of the pillars of democratic societies – nuclear is and is going to be a very important and significant part of a modern energy mix.
    New reactor concepts are under development: so called Generation IV reactors (Gen IV), small modular reactors (SMR) and many other advanced and interesting reactor types including a Dual Fluid Reactor (DFR) concept with some roots here in Szczecin.
    The presentation will review the most interesting reactor concepts and will conclude with some arguments why Poland should „go nuclear”.
  • 17.04.2019 - Filip Pratnicki

    Unoccupied natural orbitals in ground states of two-electron atoms and molecules

    Abstract: Proving the existence of unoccupied natural orbitals (UNOs), i.e. natural orbitals with vanishing occupation numbers, holds the potential of having a considerable impact on the electronic structure formalisms such as density matrix functional theory and extended Koopmans theorem. In general, the existence of UNOs in Coulombic systems is difficult to establish. However their presence in two-electron species is signaled by the transitions between different sign patterns of the natural amplitudes {λnl}.During the talk the results of recent calculations on the benchmark-quality natural amplitudes for the total of 600 natural orbitals pertaining to the ground state of the helium atom will be presented. I will describe the method of regularized Krylov sequences of Nakatsuji that is capable of achieving highly accurate wavefunction approximation and explain how it can be employed for calculations of the natural orbitals and the corresponding natural amplitudes. The numerical trends observed in the present calculations strongly suggest that, contrary to previous claims, in the case of the ground state of the helium atom the only positive-valued natural amplitude is that pertaining to the strongly occupied orbital, i.e., λ10. The relevance of this finding to the existence of unoccupied natural orbitals pertaining to the ground state wavefunction of the H2 molecule will be discussed.

  • 3.04.2019 - Mariusz Dabrowski

    Classical and quantum multiverses

    Abstract: I will explain how the idea of varying constants can lead to toy cyclic models of the parallel universes (the multiverse) with different evolution of the fundamental constants and same geometry using the condition that the total entropy of the system does not decrease. Then, I will describe how to use the second quantization method which on the level of the quantum universe is granted the so-called third quantization to form quantum the multiverse which is a quantum entangled system (in a similar way as quantum computers) on the base of these classical models. The entanglement quantities (entropy, temperature) can be the measures of the “quantumness” of some classical regimes of the universe evolution and also the tools to observationally measure the multiverse signals.

  • 9.01.2019 - Edyta Podlewska-Gaca

    Determination of physical parameters of asteroids.

    Abstract:

    Small bodies in the Solar System although numerous, still remain poorly understood. The easiest way to study asteroids are photometric observations. The lightcurves can give us a lot of information about the fundamental physical parameters such as rotation period, spin axis orientation, shape and volume which with known mass gives also density. The calculated models of asteroids, in turn are essential for testing the scenarios of the Solar system formation and evolution. In my talk I will describe the methods and present first results of determining of physical properties of asteroids obtained in framework of the projects H2020: „Smal Bodies Near And Far” and in Large Program on ESO VLT telescope.

  • 13.06.2018 - dr Marcin Olszewski

    „Widma NMR jąder kwadrupolowych w lokalnie nieuporządkowanych ciałach stałych”

    Abstract:

    Rosnąca moc obliczeniowa w połączeniu z coraz większą dokładnością pomiarów magnetycznego rezonansu jądrowego (NMR) wymaga użycia precyzyjnych modeli teoretycznych dla dopasowania widm NMR. Występowanie w badanych materiałach strukturalnego nieporządku jest przyczyną niedokładności dopasowania standardowych modeli doświadczalnych do sygnałów NMR. W wykładzie zaprezentowane zostaną obliczenia łącznych rozkładów stałej oddziaływania kwadrupolowego i parametru asymetrii tensora gradientu pola elektrycznego (EFGT) w ciałach stałych z lokalnym nieporządkiem oraz ich wpływu na kształt widm NMR jąder kwadrupolowy.

  • 6.06.2018 - dr Tomasz Denkiewicz

    „Singular models of the universe”

    Abstract:

    The recent accelerated expansion of the Universe is still an unresolved problem. Efforts towards a solution to this problem lead to the cosmological scenarios with new types of finite time singularities. These singularities have not been known, within the framework of the so-called standard concordance cosmology. The talk will cover constraining some of those scenarios with current observational data using standard candles, standard rulers, and the dark energy and dark matter density perturbations. We discuss also how dynamical dark energy universes with exotic singularities may be distinguished from the standard ΛCDM model on the basis of their redshift drift signal, for which measurements both in the acceleration phase and in the deep matter era will be provided by forthcoming astrophysical facilities.

  • 30.05.2018 - prof. dr. hab. Zbigniew Konrad Czerski

  • 16.05.2018 - dr. hab. Teresa Zwierko, prof. US

    SEMINARIUM NAUKOWE
    nt.: Wzrok w sporcie

    Podczas seminarium przedstawione zostaną projekty badawcze realizowane przez zespół naukowy
    laboratorium kinezjologii Centrum Badań Strukturalno-Funkcjonalnych Człowieka Wydziału Kultury
    Fizycznej i Promocji Zdrowia US. Wśród głównych zagadnień seminarium omówione zostaną tematy
    związane z wykorzystaniem badań elektrofizjologicznych układu wzrokowego w sporcie, badań
    funkcji okulomotorycznych przy użyciu mobilnego systemu eyetrackingowego w działaniach
    motorycznych, oraz badań eksperymentalnych nad wdrażaniem programów doskonalących funkcje
    percepcji wzrokowej u sportowców. W szczególności zaprezentowane zostaną metody pomiaru
    laboratoryjnego funkcji wzrokowych oraz pomiaru w warunkach specyfiki zachowań motorycznych.

    Data: środa, 16.05.2018
    Godzina: 12.30 -14.00
    Miejsce: Centrum Badań Strukturalno-Funkcjonalnych Człowieka WKFiPZ, ul. Narutowicza 17 C
    (wjazd od ul. Narutowicza lub wejście od ul. Głowackiego)

    Program seminarium

  • 25.04.2018 - prof. dr hab. Ewa Szuszkiewicz

    „On the Laplace resonances in planetary systems”

  • 18.04.2018 - dr Manuel Kramer

    Multiverse models in canonical quantum cosmology and their testability

    Abstract:
    The idea that our universe is part of a multiverse that consists of a multitude of other universes, which might even possess different physical constants and laws, is intriguing, but will remain speculative as long as one cannot find a way that other parts of the multiverse can have an observable effect onto our universe.

    In this talk, I will present multiverse models in the context of canonical quantum cosmology that are constructed within the framework of the so-called third quantization formalism, which results from a quantum-field-theoretical formulation of the Wheeler-DeWitt equation. These models will be analyzed with regard to their effects onto the cosmic microwave background (CMB) anisotropy spectrum.

    In the first model based on eternal inflation, the third quantization formalism converts the eternally inflating universe into an ensemble of sub-universes that exhibit a distinctive pre-inflationary phase. Assuming that our observable universe is represented by such a sub-universe, we calculate the effect of the pre-inflationary phase onto the primordial scalar power spectrum and find that there is a suppression of power on the largest scales followed by a bump leading to an enhancement. In order to get a sizable effect for the suppression to explain the observed quadrupole anomaly in the CMB, the bump is enhanced too much to be compatible with the CMB data.

    The second model involves an explicit quantum interaction between the sub-universes. Here, we obtain a different pre-inflationary phase that also leads to a suppression on large scales, but does not exhibit a prominent enhanced bump. Thus it fits the CMB data better and might even lead us towards an explanation of the CMB quadrupole discrepancy.

  • 14.03.2018 - dr hab. Franco Ferrari, prof. US

    Challenges  posed by radiation to space travels beyond the Low Earth Orbit (BLEO)

    Abstract:
    Human space exploration of Near Earth Objects (NEO’s) is on the verge of becoming of economic interest. Yet, there remain still a few factors posing serious limits to space travel. One of them is the contamination by ionizing radiation of cosmic origin. A first question whose answer has become urrgent is thus if we are able to estimate the risks posed by radiation on the health of a human crew in space. Despite many experiments in vitro and in vivo, the effects on humans of radiation consisting of heavy ions accelerated at relativistic speeds are still largely unknown. Such effects cannot be easily  extrapolated using the statistics based on well known events like the nuclear bombing of Hiroshima and Nagasaki or the several accidents on the Earth that have involved radioactive substances. Experiments with animals, usually irradiated with high doses of heavy ion particles, are useful only in part. In fact, high and acute doses do not reproduce the situations that are typical of a space mission to NEO’s, in which a dose of approximately 1Sv is delivered in the period of about one year. On the other side, experiments with intermediate doses and low dose rates are technically difficult as it is difficult to predict in the laboratory what will be their long term effects on animals. These limitations complicate also the achievement of the important goal of determining acceptable dose limits for humans. A second important question is therefore if there are alternative experimental setups that allow to improve our knowledge of the threats posed by radiation consisting of heavy ions to the health of humans. We will attempt during this talk to answer to both these questions.

  • 7.03.2018 - dr Vincenzo Salzano

    Comparing varying speed of light theories with cosmological data.

    Abstract: Varying constants theories have become well established alternative theories of gravity nowadays. In this talk we will focus on the “Varying speed of light” (VSL) theories, which have been long analyzed and debated in the last years, with multiple theoretical approaches but very few applications to observational data. We will follow two approaches. First, we will discuss a method we have developed aimed to measure the value of the speed of light at cosmological scales and at different epochs (redshifts), using multiple and independent data from galaxy surveys. Given the way it is built up, this method can unequivocally test the constancy of the speed of light on cosmological scales (up to some error depending on the architectural properties and the sensitivity of a given observational survey) and, thus, eventually confirm or reject VSL theories.” Second, we will discuss which kind of constraints are set up by present cosmological observations on VSL theories.

  • 24.01.2018 - prof. Ryhor Fedaruk, Uniwetsytet Szczeciński

    “Manifestation of a solid-state analog of vacuum Rabi splitting in EPR experiments”

  • 29.11.2017 - dr Wiktor Parol, Institute of Nuclear Physics Polish Academy of Sciences

    „Experimental studies of the nuclear interaction via deuteron breakup reaction at intermediate energy range”

    abstract abstrakt
  • 21.06.2017 - prof. dr hab. Ewa Szuszkiewicz

    The rising of a cradle of life: Formation and evolution of planetary systems

    There are various forms of life on the planet Earth, including the human kind. There is thus no wonder that a common belief is that planets offer favourable conditions, if not for the origin of life, at least for its development and evolution. In the first part of my lecture I will present the most interesting findings in our search for planets similar to Earth. Those findings provide more arguments supporting the conviction that planets are the most probable „cradles of life” in the Universe. Moreover, the discovery of „a second Earth” will be an important achievement, which will help us in understanding how our planet Earth, our Solar System and other planetary systems have been formed. In the second part of my lecture I will discuss the state-of-the-art of the formation and evolution of planetary systems with particular emphasis on the results obtained by my research group.

  • 14.06.2017 - dr inż. Grzegorz Jezierski

    Promieniowanie rentgenowskie wokół nas

    Promieniowanie rentgenowskie jest dzisiaj szeroko wykorzystywane już nie tylko w medycynie (diagnostyka oraz terapia) czy weterynarii, ale również w wielu dziedzinach przemysłu, rolnictwa i leśnictwa, produkcji żywności, farmaceutyków oraz kosmetyków, szeroko pojętego bezpieczeństwa (tzw. security), w ochronie środowiska naturalnego (np. przy separacji odpadów), w różnych dziedzinach nauki, ale także kultury i dziedzictwa narodowego (archeometria i historia kultury oraz sztuki). Natura i właściwości promieniowania rentgenowskiego pozwalają badać nie tylko wewnętrzne struktury różnych (wszystkich) materiałów i obiektów zarówno na poziomie makro jak i mikrostruktury, ale także dokonywać pomiarów masy i wymiarów detali, liczyć obiekty, mierzyć poziom napełnienia, stwierdzać brakujące elementy, określać skład chemiczny czy gęstość materiału (obiektu). Aparat rentgenowski tzw. dyfraktometr rentgenowski jest nadal podstawowym narzędziem do oceny struktury i budowy materii. Procesy produkcyjne w przemyśle stają się coraz szybsze a zarazem bardziej złożone. Nowe i coraz bardziej zróżnicowane technologie powodują konieczność stosowania takich rozwiązań w zakresie kontroli, które są w stanie uwidocznić ukryte lub bardzo małe struktury. Aby zapewnić bezpieczeństwo w dziedzinach takich jak: przemysł motoryzacyjny, aeronautyka, czy energetyka, niezbędna jest inspekcja stosowanych tam elementów zespołów czy połączeń. Ciągły trend w kierunku miniaturyzacji, a jednocześnie coraz większej zwartości układów elektronicznych w całym przemyśle elektronicznym pociąga za sobą konieczność stosowania kontroli rentgenowskiej, umożliwiającej uzyskiwanie dużych powiększeń przy zapewnieniu odpowiedniej rozdzielczości uzyskiwanego obrazu. Stąd też obserwuje się dzisiaj szybki rozwój tzw. mikroskopii rentgenowskiej przy inspekcji układów elektronicznych. Niezależnie od tego bardzo dynamicznie wzrasta liczba stosowanych nie tylko medycznych ale także przemysłowych mikro czy nanotomografów rentgenowskich, począwszy od całkowicie przenośnych po wielotonowe stacjonarne (np. do badania całych samochodów). Można więc rzec, że dzisiaj promieniowanie rentgenowskie jest wszechobecne w naszym otoczeniu.

  • 7.06.2017 dr Ihor D. Stolyarchuk

    I-VI based Diluted Magnetic Semiconductor Nanoparticles: Synthesis, Properties and Applications
    by dr Ihor D. Stolyarchuk
    Department of Physics of Semiconductors and Nanostructures, Yuriy Fedkovich Chernivtsi National University, Chernivtsi, Ukraine

    Over the past few decades, semiconductor nanoparticles (SNPs) have attracted great interest because of their unique properties and various potential applications in nanoscale photonic, light emitting diodes devices, solar cells and biomedical labeling. There is particular interest to transition metal-doped II–VI SNPs. Since these impurities can be paramagnetic, they introduce a localized spin into the nanoparticle, and form the so called diluted magnetic semiconductors (DMSs). DMSs are very promising materials for spintronic devices operating at room temperature. The present work is devoted to structural, optical, magneto-optical and related sensing properties of Mn-doped semiconductor CdS, CdTe, ZnO nanoparticles prepared by different physical and chemical methods. All the samples were characterized by optical absorption, photoluminescence, and Faraday rotation spectroscopy. Transmission electron microscopy and atomic force microscopy analyses confirmed the nanocrystallinity of all samples and allowed an estimate of the average size of nanoparticles. Optical spectra reveal a blue shift in the absorption edge and the exciton structure due to confinement effects in the studied samples. However, it was difficult to extract effect of Mn2+ ion doping on the absorption spectra for all the studied DMS nanoparticles. In contrast, contribution of magnetic ion doping was clearly visible from photoluminescence and Faraday rotation spectra. In photoluminescence spectra of Mn-doped DMS nanoparticles there appeared emission bands due to Mn2+ ions and their intensity increased with increasing of Mn2+ content. Faraday rotation spectra of the Cd1−xMnxTe/SiO2 and Zn1−xMnxO/PVA (polyvinylalcohol) composites demonstrate peculiarities, which are associated with both confinement effects and s, p–d exchange interactions. These nanocomposites are promising materials for Faraday effect based magnetic sensors for pulsed high magnetic fields measurements. Possible applications of SNPs for bioimaging will also be discussed.

  • 24.05.2017 - dr hab. Mykola Korynevskii, prof. US

    Fluctuations nanoclusters in a liquid magnetic Lattice-gas model

    We propose a statistical model for the description of fluctuation magnetic nanoclusters in a homogeneous infinite medium.The Ising-like Hamiltonian of a system is analysed using the self-consistent field approximation for the lattice-gas model. Exclusively direct spin–spin interactions are considered. A special role of a surface atoms and their interaction with the external medium are discussed in details. The grand thermodynamic potential of a system is calculated and other thermodynamic functions are obtained. A consistent set of equations for different order parameters (presenting both the radii of nanoclusters and their magnetization) is found. The essential role of the medium in the process of fluctuation nanoclusters arising is proved. The temperature dependence for the radii of the formed magnetic nanoclusteres is analysed.

  • 10.05.2017 - dr Dieter Hennig

    Principles of the modeling of large complex dynamical systems. Special aspect: Model order Reduction
    by Dieter Hennig (IFK/TU Dresden) and Carsten Lange (TU Dresden)

    Proper Orthogonal Decomposition (pattern reconstruction by data reducing/compression). The dimension of the original picture is a matrix with entries 900×600 (Pixel). In the 3 pictures of the Nuclear Training Reactor TU-Dresden the origin is reproduced with 2 (left), 30, 100 (right) proper orthogonal modes (POMs).

    In order to simulate the stability behavior of large complex systems in natural and technical sciences it is common practice in many laboratories to map the dynamical system into a system of coupled (nonlinear) partial differential equations (modeling process) and investigate the solution manifold of this system. In the framework of the reactor dynamics the equations of the neutron kinetic and the thermal hydraulics plus heat conduction describing the heat generation and heat transfer from the solid or liquid fuel to the flowing coolant are solved in the “large” system (termed also coupled) codes. To get a comprehensive overview of the stability “landscape” of the dynamical system, the solution manifold of the equation system must be known. A powerful approach to understand the nonlinear stability behavior under system parameter variations is the bifurcation analysis. Because the direct coupling of bifurcation codes with reactor dynamic (system) codes is extremely expensive, we use the so-called model order reduction (MOR) techniques as a very helpful approach. In the framework of this seminar some mathematical principles of MOR methods will be discussed and demonstrated at simple examples

  • 26.04.2017 - prof. dr hab. Mariusz P. Dąbrowski

    Hierarchy of varying speed of light c theories – theory and observations

    Varying speed of light theories (VSL) should be considered as another type of alternative gravity theories with an extra scalar field degree of freedom. Their formulation causes problems because of the violation of the light principle and relativity principle. There are a couple of physical contexts in which c appears and its role is fundamental. During my talk I will discuss some basic theoretical formulations of varying c theories and discuss their benefits as well as problems. Then, I will review some new cosmological tests of VSL theories. Finally, I will make a comparative statistical analysis of the basic theoretical frameworks.

  • 12.04.2017 - prof. Konrad Czerski

    W poszukiwaniu nowych jądrowych źródeł energii – co wydarzyło się w 2016?

  • 05.04.2017 - dr Jarosław Paturej

    Bottlebrush and cyclic macromolecules: How topology affects physical properties of polymers?

    Significant progress in polymerization techniques allows to synthesize macromolecules with complex, yet precisely controlled structure. Two distinct examples are branched-like bottlebrushes and ring-like polymers. During the talk I will demonstrate that variation of macromolecular architecture affects structural, mechanical, interfacial and frictional properties of polymers as compared to conventional linear chains.

  • 01.03.2017 - dr hab. Franco Ferrari, prof. US

    An application of the Wang-Landau Monte Carlo method to the modeling of the themal and mechanical behavior of knotted polymer rings in solutions

    The subject of this seminar are the properties and behavior in solutions of single closed polymer chains (rings) in the form of knots. The chains are defined on a simple cubic lattice. Their statistical properties are investigated by computing the expectation values of a few observables, namely the specific energy, the specific heat capacity and the gyration radius. In the case in which the chain is stretched by a tensile force directed along the z-axis, the average height of the point in which the force has been applied is measured too. The averages are computed exploiting a variant of the Wang-Landau Monte Carlo method. The algorithm has been suitably accelerated and parallelized in such a way that it is possible to sample a large number (from tens to hundreds of billions) of knot conformations. Several types of knots have been considered, including the trefoil, the figure-eight, the cinquefoil knots and many others. From the performed analysis it turns out that knotted polymer rings have a rich variety of different behaviors that can be used in order to tune the properties of polymer materials containing such knots. For instance, these polymers swell faster or slower when heated depending on the type of the knot and on the kind of interactions between the monomers. During the talk some interesting features of the stress relaxation of knotted polymer rings after the stretching force is removed will also be shown.

  • 18.01.2017 - prof. Jerzy Ciosłowski

    Rovibrational States of Wigner Molecules in Spherically Symmetric Confining Potentials

    The strong-localization limit of three-dimensional Wigner molecules, in which repulsively interacting particles are confined by a weak spherically symmetric potential, is investigated. An explicit prescription for computation of rovibrational wavefunctions and energies that are asymptotically exact at this limit is presented. The prescription is valid for systems with arbitrary angularly-independent interparticle and confining potentials, including those involving Coulombic and screened (i.e., Yukawa/Debye) interactions. The necessary derivations are greatly simplified by explicit constructions of the Eckart frame and the parity-adapted primitive wavefunctions. The performance of the new formalism is illustrated with the three- and four-electron harmonium atoms at their strong-correlation limits. In particular, the involvement of vibrational modes with the E symmetry is readily pinpointed as the origin of the anomalous weak-confinement behavior of the 1S+ state of the four-electron species that is absent in its 1D+ companion of the strong-confinement regime.

  • 11.01.2017 - mgr Dorota Gajda Instytut Chemii i Techniki Jądrowej

    Analiza możliwości pozyskiwania uranu dla energetyki jądrowej z zasobów krajowych

    W związku ze wznowieniem planów budowy w Polsce pierwszej elektrowni jądrowej ponownie zaczęto rozpatrywać możliwość pozyskiwania paliwa jądrowego z naszych zasobów krajowych. W latach 2010-2013 prowadzono w Polsce badania dotyczące możliwości pozyskiwania uranu z rodzimych zasobów. Badania te obejmowały charakterystykę geologiczną oraz chemiczne aspekty separacji tego metalu z danego złoża. Badania geologiczne prowadził Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy i analizował takie zasoby jak: ordowickie łupki dictyonemowe obniżenia podlaskiego, piaskowce triasowe syneklizy perybałtyckiej oraz złoża położone w Sudetach, Górach Świętokrzyskich, Górnośląskim Zagłębiu Węglowym oraz oligoceńskie łupki warstw menilitowych Karpat. Badania dotyczące separacji oraz oczyszczania uranu były prowadzone w Instytucie Chemii i Techniki Jądrowej. Pierwszym etapem badań było ługowanie uranu z rud, gdzie badano stopień ekstrakcji tego metalu przy wykorzystaniu różnych ekstrahentów nieorganicznych (kwasów i alkaliów) oraz rodzaj i ilość dodawanego utleniacza. Kolejnym etapem była separacja uranu od metali towarzyszących, którą prowadzono równolegle dwoma metodami: metodą ekstrakcji rozpuszczalnikowej oraz metodą wymiany jonowej. Ostatnim elementem badań było wytrącenie yellowcake, czyli handlowej formy uranu. Dodatkowo w IChTJ badano możliwości pozyskiwania uranu jako produktu ubocznego z przemysłu wytwarzania nawozów fosforowych oraz z przemysłu miedziowego.

  • 14.12.2016 - dr hab. Marcin Buchowiecki, prof. US

    Challenges in molecular partition functions calculations

    Molecular partition function is a basic quantity that connects microscopic and macroscopic worlds. For chemical applications molecular partition functions are crucial for calculating equilibrium constants, rate constant of chemical reaction and corresponding isotope effects. In practice, a widely used rigid rotor harmonic approximation fails at high temperatures where potential energy surface inflects and does not look like harmonic potential any more (picture). Explicit summation of energy levels is also not possible for bigger molecules and higher temperatures. Abovementioned problems and possible solutions will be discussed.

  • 09.20.2016 - dr Andrzej Styszyński

    Dlaczego optyk okularowy powinien znać procedury doboru korekcji optycznej