The SST-1M project for the Cherenkov Telescope Array

The SST-1M project, run by a Consortium of institutes from Czech Republic, Poland and Switzerland, has been proposed as a solution for implementing the small-size telescope array of the southern site of the Cherenkov Telescope Array. The technology is a pathfinder for efficient production of cost-effective imaging air Cherenkov telescopes. We report on the main system features and recent upgrades, the performances validation and the operation campaign carried out in 2018

Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of γ cosmology that can be explored as part of the Key Science Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic jets. Observations of AGN with CTA will enable a measurement of γ absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z=2 and to constrain or detect γ halos up to intergalactic-magnetic-field strengths of at least 0.3 pG . Extragalactic observations with CTA also show promising potential to probe physics beyond the Standard Model. The best limits on Lorentz invariance violation from γ astronomy will be improved by a factor of at least two to three. CTA will also probe the parameter space in which axion-like particles could constitute a significant fraction, if not all, of dark matter. We conclude on the synergies between CTA and other upcoming facilities that will foster the growth of γ cosmology.</p

Monitoring of machinery and equipment work

Niniejsze opracowanie przedstawia realizację Centrum Nadzoru Energomechanicznego (CNE) w KWK „Piast” oraz wybrane przykłady wykorzystania istniejących aplikacji do nadzorowania istotnych parametrów procesu produkcji.This study shows the implementation of the Electromechanical Supervision Center (CNE) in the "Piast" mine, and selected examples of existing applications used to monitor the essential parameters of the manufacturing process

Historical gardens restoration problems. The example of restoration plan of park in Gorzyń

Celem pracy jest stworzenie koncepcji rewaloryzacji części przypalacowej zabytkowego parku w Gorzyniu w oparciu o wykonaną wcześniej inwentaryzację. Docelowo założenie ma stanowić przestrzeń atrakcyjną dla lokalnej społeczności. Ze względów na duże walory estetyczne, teren będzie miejscem wypoczynkowym, zachęcającym do turystyki i rekreacji. Przedstawiono ogólne informacje o miejscowości Gorzyń, a także rys historyczny zabytkowego parku. Druga część pracy dotyczy inwentaryzacji parku, która umożliwiła przeprowadzenie analiz i opisanie obecnego stanu założenia, a całość wzbogacono dokumentacją fotograficzną. W efekcie końcowym powstała koncepcja rewaloryzacji otoczenia pałacu w postaci graficznej.The aim of this work is to create a concept of restoration of a palace part of historie park in Gorzyń. It is based on previously made tree uwentory. It should be arranged as a public space, attractive for the local community. Due to the high aesthetic value, the area will be meant for leisure, thus encouraging tourism and recreation. The article provides generał information about Gorzyń, as well as the historical background of the palace park. The second part of the work concerns on the tree inventory of the park. The tree iwentory allowed to conduct various analysis and describe the current state of the park. The text is enriched with the photographic documentation. In the end, a concept of restoration of the palace park is provided in graphical form

The Spatial Composition of the Historic Estate in Smolice and Scenic Views in the Modern Landscape

The palace and grounds of Smolice is one of the most beautiful estates in the cultural landscape of southern Wielkopolska. Historically, the palace is relatively new – it was built at the turn of the nineteenth century on the site of an old, wooden mansion and kept the spatial arrangement which had previously been there. The aim of this study is to show the scenic views between the composition of the park in Smolice and the contemporary rural landscape and to compare the historic and contemporary sites in the landscape. The study follows the history of the palace estate in Smolice. A detailed inventory of the estate was taken including a dendrological inventory, which was used to conduct dendrochronological analysis of the species and age of the tree stand. Then, an analysis was made of the spatial composition and historic scenic views between the estate, the landscape and major historical buildings. The research results provide information on the original historic landscape and evidence of the scenic views from the historic landscape that can be seen today. A design and virtual model was made of the reconstruction of the palace estate in Smolice

Palace and garden in Gladysze as an example of Genius Loci of forgotten places

Zespół pałacowo-ogrodowy w Gładyszach charakteryzował się kompozycją barokową, która wpisywała się w krajobraz dawnych Prus Wschodnich. Celem pracy była analiza historycznej kompozycji przestrzennej i powiązań widokowych w kontekście stanu aktualnego obiektu, identyfikacja nawarstwień stylowych oraz rozpoznanie zapomnianego na przestrzeni lat genius loci. Osiągnięcie wymienionych celów możliwe było dzięki zastosowaniu rozbudowanego instrumentarium badawczego i metod analitycznych z wykorzystaniem trójwymiarowych modeli.The palace and baroque garden in Gladysze fit in the landscape of the former East Prussia. The aims of the paper were: the analysis of a historical spatial composition and scenic relations (in the context of the current state of the object) and identification of style layers and forgotten genius loci. The achievement of those objectives was possible by using different methods. Analysis and 3D models were created

Ocena wpływu zmiennych środowiskowych na stan zdrowotny lipy drobnolistnej w parkach

Analyses concerned the effect of different environmental variables on the health status of little-leaf linden (Tilia cordata Mill.). The study comprised analyses and statistical models based on discriminatory analysis. These analyses indicated which variables may influence the health status of tress of the investigated species in the parks of Poznan. The model was based on the canonical variate analysis (CVA), ie Fisher’s canonical variant of linear discriminatory analysis (LDA). The greatest negative effect on the health status of trees of Tilia cordata Mill. in Poznan parks was found for the small distance of the parks from the city centre and the immediate vicinity of two arterial roads. It was also found that the vicinity of buildings heated with fossil fuels, primarily coal, may have had a negative effect on the health status of Tilia cordata Mill. trees in the Poznan parks. Moreover, it was shown that specimens of the investigated species aged 81–120 years were characterised by the worst health status, while the best health condition was found in trees of Tilia cordata Mill. in the Millennium Park.Badania dotyczyły wpływu różnych zmiennych środowiskowych na stan zdrowotny lipy drobnolistnej (Tilia cordata Mill.). W pracy wykorzystano analizy i modele statystyczne stworzone w oparciu o analizę dyskryminacyjną. Wynikiem przeprowadzonych analiz było wykazanie, które zmienne mogą wpływać na stan zdrowotny drzew badanego gatunku na terenie parków Poznania. Do skonstruowania modelu wykorzystano analizę CVA (canonical variate analysis) – kanoniczną odmianę liniowej analizy dyskryminacyjnej Fishera (LDA). Stwierdzono, że największy negatywny wpływ na stan zdrowotny drzew Tilia cordata Mill. w parkach Poznania miała niewielka odległość parków od centrum miasta oraz bezpośrednia bliskość dwóch arterii komunikacyjnych. Stwierdzono również, że bliskość zabudowań ogrzewanych paliwami kopalnymi, przede wszystkim węglem kamiennym, mogły wpływać negatywnie na stan zdrowotny drzew Tilia cordata Mill. na terenie parków Poznania. Wykazano również, że osobniki drzew badanego gatunku z przedziału wiekowego 81–120 lat charakteryzowały się najgorszym stanem zdrowotnym, a najlepszą zdrowotność drzew Tilia cordata Mill. stwierdzono w Parku Tysiąclecia Państwa Polskiego

Feasibility studies of the polarization of photons beyond the optical wavelength regime with the J-PET detector

J-PET is a detector optimized for registration of photons from the electron–positron annihilation via plastic scintillators where photons interact predominantly via Compton scattering. Registration of both primary and scattered photons enables to determinate the linear polarization of the primary photon on the event by event basis with a certain probability. Here we present quantitative results on the feasibility of such polarization measurements of photons from the decay of positronium with the J-PET and explore the physical limitations for the resolution of the polarization determination of 511 keV photons via Compton scattering. For scattering angles of about 82∘ (where the best contrast for polarization measurement is theoretically predicted) we find that the single event resolution for the determination of the polarization is about 40∘ (predominantly due to properties of the Compton effect). However, for samples larger than ten thousand events the J-PET is capable of determining relative average polarization of these photons with the precision of about few degrees. The obtained results open new perspectives for studies of various physics phenomena such as quantum entanglement and tests of discrete symmetries in decays of positronium and extend the energy range of polarization measurements by five orders of magnitude beyond the optical wavelength regime.© The Author(s) 201