PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 17

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Hybrid upconverting/paramagnetic Fe3O4/Gd2O3:Er3+, Yb3+, Mg2+, Nd3+ nanoparticles : synthesis, characterization and biological applications
Kamińska Izabela, Sobczak Kamil, Zhydachevskyy Yaroslav, Wojciechowski Tomasz, Minikayev Roman, Sikora-Dobrowolska Bożena, Lewińska Sabina, Chojnacki Michał, Fronc Krzysztof
Opto-Electronics Review
|
2024
|
Vol. 32, No. 2
art. no. e150182
EN
The goals of this work are to design and develop a technology for fabrication and study of multifunctional properties of core/shell nanoparticles (NPs) as magnetic/luminescent markers. The new hybrid core/shell Fe₃O₄/Gd₂O₃:1% Er³+, 18% Yb³+, 2.5% Mg²+, x% Nd³+ NPs doped with different concentrations of neodymium ions, where x = 0%, 0.5%, 0.75%, 1%, 2%, 4%, were synthesized by the co-precipitation method. The NPs were characterised using XRD, TEM, SEM, EDX, confocal microscopy and photoluminescence. Fe₃O₄ (core) consists of several 13 nm NPs. The core/shell NPs have sizes from 220 nm to 641 nm. In this latter case, the shell thicknesses were 72, 80, and 121 nm. The upconversion efficiency properties and magnetic properties of the hybrid NPs were investigated. In the core/shell NPs, the addition of Nd³+ quenches the luminescence. The magnetic response of core/shell samples is rather paramagnetic and does not differ significantly from that registered for the shell material alone. For Gd₂O₃:1% Er³+, 18% Yb³+ and Fe₃O₄/Gd₂O₃:1% Er³+, 18% Yb³+, 2.5% Mg²+, 0.5% Nd³+, at 300 K, the values of the magnetization registered at ~ 40 kOe are similar and equal to ~ 5.3 emu·g⁻¹. The survivability of the HeLa tumor cells with the presence of the core/shell NPs was investigated for 24 h. The NPs are non-toxic up to a concentration of 1000 μg·ml⁻¹ and penetrate cells in the process of endocytosis which has been confirmed by confocal microscope studies.
2
Content available remote Problemy optymalizacji prosumenckiej mikrosieci OZE dla małych i średnich przedsiębiorstw
Mikołajczak Mirosław, Muszyński Roman, Wojciechowski Tomasz
Utrzymanie Ruchu
|
2023
|
Nr 1
6--17
PL
W dobie kryzysów energetycznych, grożących ograniczeniami w dostawach energii i rosnącymi jej cenami, wiele małych i średnich przedsiębiorstw rozważa zainwestowanie w mikrosieć prosumencką OZE. Czym jest mikrosieć i jakie problemy należy mieć na uwadze, aby rozwiązanie to było korzystne?
3
Content available Zagrożenia geologiczne w Polsce w 2021 roku
Wojciechowski Tomasz, Laskowicz Izabela, Kos Jarosław, Marciniec Paweł, Uścinowicz Grzegorz, Przyłucka Maria, Wódka Marcin
Przegląd Geologiczny
|
2022
|
Vol. 70, nr 9
617--626
EN
Geological hazards caused by landslides, earthquakes, erosion, land surface deformation and collapse in 2021 in Poland were among the average compared to recent years. They did, however, affect material losses. The Polish Geological Survey (PGS) recorded 41 events related to sudden landslide activations, which damaged or destroyed 17 road sections. Through ongoing monitoring of 72 landslides, 33 were shown to be active. In 2021, more than 5,200 landslides were identified and inventoried in Poland. Geodynamic monitoring performed by PGS recorded 611 seismic events in Poland, whose magnitudes reached M4.2. In addition, using satellite radar interferometry, continuation of land surface deformations was found mainly in mining areas. In 2021, there was a number of collapses of various origins. The paper is a brief report on the ongoing tasks of the Polish Geological Survey in the field of geological hazards and presents events that took place in Poland in 2021.
4
Content available Monitoring dynamiki ruchów powierzchni osuwisk w warunkach zmiennego poziomu wód gruntowych z wykorzystaniem reflektorów radarowych
Perski Zbigniew, Wojciechowski Tomasz
Przegląd Geologiczny
|
2022
|
Vol. 70, nr 9
661--670
EN
The main objective of the presented analysis was to investigate to what extent even minor changes in the hydrological and hydrogeological environment affect the changes in the dynamics of landslide surface displacement. The research was carried out for selected monitored landslides, which, in addition to the in-depth monitoring devices, were equipped with corner reflectors suitable for satellite radar interferometry measurements. The high temporal resolution of the interferometric data allowed demonstrating the existence of a relationship between the speed of surface movements and slight changes in the depth to the groundwater table. The analyses were performed for five landslides, which also showed a high dependence of these compounds on the geological structure of the landslide and its substrate.
5
Content available Zagrożenia geologiczne w Polsce w 2020 roku
Wojciechowski Tomasz, Laskowicz Izabela, Nescieruk Piotr, Marciniec Paweł, Uścinowicz Grzegorz, Czerwiński Tomasz, Perski Zbigniew
Przegląd Geologiczny
|
2021
|
Vol. 69, nr 5
303--311
EN
The paper describes geohazard events that took place in 2020 on the territory of Poland. The PGI is responsible for geohazard monitoring in four areas of interest :landslides and mass movements within the Landslide Counteracting System (LCS, SOPO in Polish), earthquakes within the Geodynamical Monitoring of Poland and ground motions within the Interferometric Terrain Deformations Monitoring of Poland, and coastal monitoring carried out by the Marine Geology Branch within a framework of the 4D Cartography. In 2020, there were no spectacular geohazard events; however, there were some permanently active phenomena, mostly landslides, which caused significant damages to the infrastructure.
6
Content available remote Rozwiązania techniczne wykorzystywane podczas budowy Varso Place w Warszawie
Wojciechowski Tomasz
Materiały Budowlane
|
2021
|
nr 9
79--82
7
Content available remote Jak minimalizować zagrożenie osuwiskami dla budowli hydrotechnicznych w Polsce
Perski Zbigniew, Wojciechowski Tomasz, Nescieruk Piotr
Inżynier Budownictwa
|
2021
|
nr 10
34--38
8
Content available Porównanie modeli 3D pomieszczeń biurowych opracowanych na podstawie pomiarów wykonanych różnymi metodami
Onyszko Klaudia, Zwirowicz-Rutkowska Agnieszka, Fryśkowska-Skibniewska Anna, Wojciechowski Tomasz
Roczniki Geomatyki
|
2020
|
T. 18, z. 1(88)
117--134
PL
Wzrost zainteresowania modelowaniem 3D jest związany ze zwiększającą się szczegółowością tworzonych wirtualnych modeli miast, prezentacją deweloperskich mieszkań w trójwymiarze oraz wspomaganiem procesów związanych z całym cyklem życia budynku. Celem publikacji jest porównanie modeli 3D pomieszczeń biurowych opracowanych na podstawie pomiarów wykonanych skanerem laserowym i tachimetrem bezlustrowym. Badania przeprowadzono dla wybranych pomieszczeń biurowych usytuowanych na terenie Wojskowej Akademii Technicznej w Warszawie. W ramach prac badawczych przeprowadzono analizę ilościową modeli 3D, której wyniki przedstawiono w postaci histogramów różnic jednoimiennych współrzędnych (X, Y, Z) wybranych 20 homologicznych punktów na modelach. Artykuł prezentuje również analizę zastosowanych metod pomiarowych pod względem ekonomicznym, biorącym pod uwagę aspekt kosztowności sprzętu geodezyjnego i oprogramowania oraz nakładu pracy.
EN
The growing interest in 3D modelling is associated with the increasing detail of created virtual city models, the presentation of flats in three dimensions and the support of processes related to the entire life cycle of the building. The aim of the publication is to compare 3D models of office rooms based on measurements made with a laser scanner and a reflectorless total station. The study was conducted for selected office accommodation in the building located at the Military University of Technology in Warsaw. A quantitative analysis of 3D models was carried out, which results were presented in the form of histograms of the same-coordinate differences (X, Y, Z) of selected 20 homologous points on models. An analysis of the measurement methods used in the study taking into account economic terms is also presented, including the costs of geodetic equipment and software as well as the workload.
9
Content available Rozwój badań osuwisk w Państwowym Instytucie Geologicznym
Wójcik Antoni, Wojciechowski Tomasz, Wódka Marcin, Kaczorowski Jarosłąw, Kamieniarz Sylwester, Sikora Rafał, Kułak Marcin, Karwacki Krzysztof, Warmuz Bartłomiej, Perski Zbigniew
Przegląd Geologiczny
|
2020
|
Vol. 68, nr 5
356--363
EN
The paper presents the history and latest achievements in landslide research at the Polish Geological Institute (PGI). Since the establishment of PGI in 1919, landslides have been investigated during geological mapping in the Carpathians and considered by engineering geologists. After the 2nd World War, the importance of landslide research becomes more and more important following each landslide catastrophic event. Since 2008, the research on landslide and mass movements has been carried out systematically at the PGI within the SOPO (Landslide Counteracting System) project framework. Since that time, the SOPO project has been developing from landslide mapping and recording into a large spatial database, a sophisticated monitoring system (including on-line data acquisition) and susceptibility analysis, and early warnings with prediction capabilities. SOPO plays an important role to local and national administration. Together with the legal component, it allows defining a strategy for landslide risk reduction in Poland. Recently, landslide research plays so important role at the PGI that a special department, called Geohazard Center, has been established within the PGI organizational structure.
10
Content available Effect of Unitary Soil Tillage Energy on Soil Aggregate Structure and Erosion Vulnerability
Wojciechowski Tomasz, Mazur Andrzej, Przybylak Andrzej, Piechowiak Jarosław
Journal of Ecological Engineering
|
2020
|
Vol. 21, nr 3
180--185
EN
The integrated soil tillage developed in the Institute of Biosystem Engineering is based on a single pass of basic tillage, secondary tillage and sowing or planting. The integrated soil tillage enables to achieve a relatively high mechanical strength of the soil. An important element of the technology is the use of tillage roller sets which significantly influence the obtained aggregate structure and its eolic resistance. The aim of the study was to determine the influence of roller speed under various soil moisture conditions on the aggregate structure of the arable soil layer. The research was carried out on the production field in Dziećmierowo, Wielkopolska Voivodeship, Poland, on medium soil with the mechanical composition of light clay. During the research, cultivation sets with two units of Campell + Croskill platelet and studded rollers were used. For two actual soil moisture levels and five speeds within the range of 3–7 km/h, the influence of unit tillage energy at three levels of the cultivating layer (0–5 cm, 5–10 cm and 10–15 cm) was analyzed on the aggregate structure of soil and the content of aggregates with the highest resistance to wind erosion. The results of the work lead to the conclusions that it is possible to use the working speed and overloading of rollers set in integrated soil tillage trailer to manipulate the process of forming an optimal, erosion-resistant soil layer. However, it should be pointed out that for even very similar types of roller sets, the process control under different soil moisture conditions may be different and require an individual test.
11
Content available Raport z formowania struktury soczewki Fresnela i pomiarów jej własności ogniskujących
Roszkiewicz Agata, Wojciechowski Tomasz, Nasalski Wojciech, Kossut Jacek
IPPT Reports on Fundamental Technological Research
|
2020
|
nr 1
10--16
PL
Raport zawiera graficzny zestaw wyników prac prowadzonych w okresie październik 2019 – marzec 2020 w ramach współpracy pomiędzy IPPT PAN i IF PAN. Prace prowadzone w IF PAN dotyczyły nałożenia warstwy złota na płytkę kwarcu i grawerowania w tej warstwie struktury jednowymiarowej soczewki Fresnela. Prace prowadzone w IPPT PAN dotyczyły wyznaczania parametrów geometrycznych wygrawerowanej struktury i charakterystyk jej oddziaływania z padającym polem optycznym. Prace eksperymentalne obu zespołów badawczych pozwoliły na precyzyjne sformowanie jednowymiarowej struktury ogniskującej typu płytki strefowej Fresnela (Fresnel Zone Plate - FZP) o właściwościach zgodnych z wynikami symulacji numerycznych.
12
Content available Zagrożenia osuwiskowe dla sztucznych zbiorników wodnych w Karpatach
Perski Zbigniew, Nescieruk Piotr, Wojciechowski Tomasz
Przegląd Geologiczny
|
2019
|
Vol. 67, nr 5
332--338
EN
Starting from 2011, landslides in Łaski over the Żywieckie lake and in Piaski-Drużków over the Czchowskie Lake have been included into the landslide monitoring program as a part of the SOPO project of PGI-NRI. Both landslides present a real hazard to hydrotechnical constructions. In 2018 the monitoring has been extended for the Łaski landslide including the on-line component. The article presents the subsurface and surface monitoring systems and discusses the results of over 7-years observations. In both discussed cases, the landslides have long, multi-stage history. The measurement data show that, their activity has decreased since the activation impulse in 2010. However, they remain active, especially on the deep slip surfaces. High porosity and, consequently, rapid changes in the groundwater level and rainfall intensity confirm the unstable nature of these landforms. This also confirms that the possibility of further activation or sudden landslide descent into water reservoirs is still a real hazard.
13
Content available Podatność osuwiskowa Polski
Wojciechowski Tomasz
Przegląd Geologiczny
|
2019
|
Vol. 67, nr 5
320--325
EN
Using the location data of landslides and information on geo-environmental conditions, the landslide susceptibility in Poland was calculated using statistical methods. It shows that 15% of the country’s area is susceptible to landslides. The greatest threats occur in the Carpathians and in many regions of the Sudetes, uplands and in the riverbanks. The most vulnerable areas are the slopes in the range of 9-30°, which are built by the flysch sediments in the faulted zones. The areas susceptible to landslides include over a million buildings and about 7,000 km of roads.
14
Content available Osuwiska w Sudetach
Sikora Rafał, Wojciechowski Tomasz
Przegląd Geologiczny
|
2019
|
Vol. 67, nr 5
360--368
EN
This paper presents the results of analysis of landslides distribution in the Sudetes (SW Poland). Our study was based on the analysis of the LiDAR-data digital elevation model and integrated with investigations of different factors for landslide development. The results of the study showed relationships between the spatial distribution of landslides and geology of their basement. For the areas built by Permo-Mesozoic and late Variscan sedimentary and volcanogenic rocks, the tectonic and lithological factors are predominant for landslide occurrences. The largest landslides have a tectonic affinity and represent a frontal type of geometry. The relationships between geological conditions and mass movements were also confirmed by the constructed landslide susceptibility map of the Sudetes.
15
Content available Osuwiska w Polsce : od rejestracji do prognozy, czyli 13 lat projektu SOPO
Marciniec Paweł, Zimnal Ziemowit, Perski Zbigniew, Wojciechowski Tomasz, Rączkowski Wojciech, Laskowicz Izabela, Nescieruk Piotr, Grabowski Dariusz, Kułak Marcin, Wójcik Antoni
Przegląd Geologiczny
|
2019
|
Vol. 67, nr 5
291--297
EN
Theintensification of disastrous landslide movements in southern Poland occurring at the end of the 20th century, showed that there was a need to create a unified system of acquiring and collecting landslide data. It also indicated the importance of raising awareness of the existence of landslide hazard for both residents and public administration (decision-makers). This was also the reason for launching a nationwide project, the Landslide Counteracting System (LCS; SOPO in Polish). This system is a platform for acquiring and processing information about mass movements in order to support mainly for government and local administration. The main goal of the project is to reduce the landslide riskin Poland,and to limit damages caused by the development of landslides.
16
Content available Osuwiska : problemy prawne, społeczne i administracyjne
Wojciechowski Tomasz
Przegląd Geologiczny
|
2019
|
Vol. 67, nr 5
298--302
EN
This article presents issues and problems related to landslide hazards in the context of geology and law. Based on the previous experience, the author discusses how landslides are perceived in the practice ofgovern- ment, self-government and spatial planning. This article presents the most common problems and sources of potential conflicts that are in the scope of interest ofgeologists, administrations, investors and inhabitants ofendangered areas. The gaps and ambiguities in the regulations as well as suggestion of the proper procedure are discussed.
17
Repair Café i Współdzielnia kontra ślepy konsumpcjonizm naszych czasów
Wojciechowski Tomasz
Energia i Recykling : gospodarka obiegu zamkniętego
|
2018
|
nr 6
12--15
PL
Gdy masz za dużo - nie wyrzucaj, ale ... dziel się. Nie wyrzucaj również, gdy coś jest uszkodzone, bo prawdopodobnie da się to naprawić, a na pewno jest gdzie. Bo są miejsca takie jak Repair Café i Współdzielnia, oddolne inicjatywy powołane do walki ze ślepym konsumpcjonizmem.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.