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Tytuł:
Las na gruncie porolnym - oczekiwania i rzeczywistość
Forest on post-agricultural land - expectations and reality
Autorzy:
Krawczyk, R.
Kowalczuk, S.
Ksepko, M.
Sierota, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2136482.pdf
Data publikacji:
2021
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
grunty porolne
zalesianie
gospodarka lesna
lasy porolne
stan zdrowotny lasu
sukcesja roslin
odnowienia naturalne
post-agriculture lands
afforestation
managed forests
forest health
succession
natural regeneration
Opis:
In Central Europe, deforestation led to a reduction of forest area by almost 80%, compared to the original area, by the beginning of the 20th century. At this point in time, a period of intensive reforestation began in an effort to restore forest areas. This process of reforestation, especially on post-agricultural land, continues to this day. This article examines reforestation and natural regeneration on former farmland and the factors that influence the current state as well as the future growth of the forest. Ancient and contemporary views on the functioning of stands on post-agricultural land created by both, natural and forced succession (i.e. afforestation), are recalled. In Poland, this issue primarily concerns managed state forests, which cover an area of over 2 million hectares. We discuss the differences in the development of these stands resulting from the history of agricultural cultivation, the type of afforestation, the influence of environmental factors as well as biotic threats to their development. Furthermore, the need to change the silviculture-, protection- and endowment-based approach to forest management in stands on post-agricultural land is highlighted.
Źródło:
Leśne Prace Badawcze; 2021, 82, 2; 75-86
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwości wykorzystania procesów sukcesyjnych w przebudowie drzewostanów na gruntach porolnych na przykładzie Nadleśnictwa Wielbark
The potential utility of successional processes during timber stand improvement on post-agricultural land in the Wielbark Forest District: a case study
Autorzy:
Krawczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/2142616.pdf
Data publikacji:
2021
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
grunty porolne
zalesianie
przebudowa drzewostanow
huba korzeni
sukcesja wtorna
Opis:
In the Wielbark Forest District, and many other forest districts in Poland, disturbances caused by annosum root rot Heterobasidion annosum (Fr.) Bref. have been observed regularly in timber stands cultivated on post-agricultural land. Natural regeneration in the resulting gaps is dominated by birches, but also other tree and shrub species occur. A better understanding of those natural successional processes is required in order to possibly include them in management practices, i.e., to employ them as an aid in stand conversion or improvement. This goal formed the foundation for this study, which was carried out under the assumption that the natural renewal of trees owing to annosum root rot would satisfy the requirements for silvicultural practices. The work was carried out in a pine stand sequence, aged from 1 to 100 years, representing two habitat types, fresh conife- rous forest (Bśw) and fresh mixed coniferous forest (BMśw), grown on post-agricultural land with a total area of 15 757.31 ha. A 100×100 m square grid was established within which 125 circular sampling fields were selected randomly. Both, the existing timber trees and natural regrowth were measured, including an estimation of H. annosum sporocarps to show whether root rot infection had taken place. A detailed analysis of changes in the stocking index revealed that the most damaged tree stands belong to the third age group in both habitats. However, the changes observed in stands from the Bśw habitat were smaller and occurred with a delay compared with those from the BMśw habitat. In conclusion, in response to a disturbance caused by annosum root rot, natural regrowth appeared, involving 4 and 8 tree species respectively in the Bśw and BMśw habitats, but for both habitats, the regrowth was mostly comprised of pine and birch. Therefore, the results from this study clearly indicate that spontaneous regenerative processes would be of use if they were to be included in silvicultural practices.
Źródło:
Leśne Prace Badawcze; 2021, 82, 1; 1-14
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The severity of depressive and anxiety symptoms in postmenopausal women depending on their Magnesium, Zinc, Selenium and Copper levels
Autorzy:
Wieder-Huszla, S.
Zabielska, P.
Kotwas, A.
Owsianowska, J.
Karakiewicz-Krawczyk, K.
Kowalczyk, R.
Jurczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1192499.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
depressive disorder
postmenopause
micronutrients
Opis:
Women, especially in the peri- and postmenopausal periods, undergo many organic and functional changes. Fluctuation and ultimately a decline in the levels of female reproductive hormones is a long-lasting process, potentially leading to regulatory disorders of the autonomic nervous system. In consequence, postmenopausal women experience depressive mood disorders and more severe anxiety symptoms. The aim of this study was to assess the severity of anxiety and depressive symptoms in postmenopausal women in connection with the serum levels of zinc (Zn), magnesium (Mg), selenium (Se), and copper (Cu). The study involved 102 healthy postmenopausal women. It was divided into two parts: the first part was based on a survey performed using standardized research instruments and a questionnaire developed by the authors. The second part involved a biochemical serum analysis, whose aim was to determine the levels of selected elements. The mean level of anxiety as a state was 4.53±1.79, and the mean level of anxiety as a trait was 3.86±2.03. The mean level of depression according to the Beck Depression Inventory was 6.77±6.82. As many as 77.5% of the women had no depressive symptoms. The mean serum levels of the studied elements were as follows: magnesium (19.41±02.81 mg dm-3), zinc (0.94±0.22 mg dm-3), selenium (0.06±0.03 mg dm-3), and copper (0.40±0.57 mg dm-3). No relationship was demonstrated between the levels of selected elements and the development of depressive and anxiety disorders in the studied postmenopausal women.
Źródło:
Journal of Elementology; 2020, 25, 4; 1305-1317
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bariery komercjalizacji dóbr intelektualnych w świetle współpracy nauki z biznesem
Barriers of commercialization of intellectual goals in the light of cooperation with science with business
Autorzy:
Bartnicki, A.
Krawczyk, I.
Krawczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/315586.pdf
Data publikacji:
2018
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
komercjalizacja bezpośrednia
komercjalizacja pośrednia
dobro intelektualne
licencja
direct commercialization
indirect commercialization
intellectual goods
Opis:
W artykule przedstawiono problematykę związaną z komercjalizacją dóbr intelektualnych wytworzonych w uczelni wyższej. Zaprezentowano rolę Centrów Transferu Technologii i Spółek Celowych w procesach komercjalizacji bezpośredniej i pośredniej. Wskazano podstawowe bariery towarzyszące procesom komercjalizacji, wynikające zarówno z realiów funkcjonowania uczelni wyższej, jak i oczekiwań przedsiębiorców i inwestorów.
The article presents the problems associated with the commercialization of intellectual goods created at a university. It also shows the role of the centers for the technology transfer and the special purpose vehicles in the processes of direct and indirect commercialization. The publication indicates a basic barriers accompanying the commercialization processes, resulting both from the reality of the university's functioning and the expectations of entrepreneurs and investors.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 12; 1020-1025
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Binocular summation evaluated by early and late visual evoked potentials
Autorzy:
Czaińska, M.
Przekoracka-Krawczyk, A.
Naskręcki, R.
van der Lubbe, R.
Powiązania:
https://bibliotekanauki.pl/articles/174864.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
binocular summation
binocular vision
visual evoked potentials
Opis:
The visual evoked potential technique makes it possible to explore the visual system with a high temporal resolution, thereby providing information about different phases of binocular integration. The aim of the study was to characterize the amplitude, latency and scalp distribution of pattern-reversal gratings visual evoked potentials related to binocular viewing. 12 adult participants without any pathology of the visual system were examined by electroencephalography (EEG), with three viewing conditions: the dominant eye, non-dominant eye, and both eyes. They were tested with reversed checkerboard patterns presented with a frequency of 1.02 Hz. The amplitudes of visual evoked potentials were calculated to detect the effect of binocular integration. The strongest binocular summation was observed on the N75 component. P100 component was also affected by binocular viewing, mainly above parieto-occipital cortex. In the later time window binocular summation was reflected in changes in amplitude of N145 component over the right parieto-occipital region. The obtained results suggest that binocular summation is not limited to occipital cortex as its influence was also observed above parieto-occipital regions. Changes in amplitude of N75 component looks to be a good predictor of binocular summation.
Źródło:
Optica Applicata; 2018, 48, 1; 137-148
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in serum neopterin and C-reactive protein concentrations in female dogs with mammary gland tumours
Autorzy:
Szczubiał, M.
Dabrowski, R.
Łopuszyński, W.
Bochniarz, M.
Krawczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2087616.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
neopterin
C-reactive protein
mammary gland tumours
female dogs
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 4; 691-696
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peculiar thermodynamic properties of the Falicov-Kimball model for small U couplings
Autorzy:
Krawczyk, J.
Lemański, R.
Powiązania:
https://bibliotekanauki.pl/articles/1048506.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
71.20.-b
71.45.Lr
Opis:
We analyse a behaviour of the order parameter and specific heat of the Falicov-Kimball model (FKM) on the Bethe lattice using the Dynamical Mean Field Theory (DMFT) formalism, which provides the exact solution in the limit of large spatial dimensions. In the large U limit, the FKM maps onto the effective Ising model, with the order parameter of the Curie-Weiss form. However, in the small U limit the order parameter takes on unusual shape, with a sharp reduction near T ≈ T_{c}/2. We focus our investigation on a crossover between these two limits, thus we perform our calculations for a set of intermediate and small values of U. We find the overall behaviour of the order parameter and specific heat as a function of temperature to be quite anomalous.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 369-371
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensory processing related to vergence eye movements – an event-related potential study
Autorzy:
Przekoracka-Krawczyk, A.
Wojtczak-Kwaśniewska, M.
Przekoracka, K.
Zeri, F.
Naskręcki, R.
Powiązania:
https://bibliotekanauki.pl/articles/173819.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
eye movements
vergences
event-related potential
Opis:
Vergence eye movements, movements executed in opposite directions, have a crucial role in depth perception and are necessary for maintaining proper binocular vision. Despite these facts, the neurophysiological studies of vergence eye movement on humans are rare and give ambiguous results. In the present study, the sensory event-related potentials (ERPs) related to the processing of stimuli called for convergence, divergence and saccade were explored. Sixteen healthy subjects (mean 23 years old) performed reflexive (visually-guided) eye movements and event-related potentials from 64 active electrodes were recorded. The significant preponderance of cortical activity for convergence among three conditions was revealed and it concerned both anterior (larger negativity) and posterior cortex (larger positivity). Here, we also reported the longest latency for convergence. These results may suggest larger cortical representation for stimuli presented in near visual space, thus the preponderance of near cells within cortex, which respond to cross retinal image disparity being a cue for convergence.
Źródło:
Optica Applicata; 2018, 48, 3; 463-475
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of cavitation erosion on austenitic-ferritic steel
Autorzy:
Krawczyk, J.
Jasionowski, R.
Ura, D.
Goły, M.
Frocisz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/135269.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cavitation
austenite destabilization
duplex steel
erosion wear
plastic deformation
material
Opis:
Cavitation is a one of many wear mechanisms which are related to the flow of liquid. It is one of the most destructive wear methods for stainless materials. The local changes in the pressure of the liquid stream related to the flow across the metal component cause straightening of the surface area, as well as its erosion and the formation of pits on the surface layer. The erosion value of cavitation is related to the material’s microstructure, the geometry of the element, the phase composition of the material and the surface roughness. In this paper the investigation of the cavitation process for duplex stainless steel has been performed. Samples examined in the first stages of the experiments were not significantly changed, but after a long time the hardness increase was very visible. The result of the cavitation was also cracking along the interphase boundaries, which resulted in the chipping of the material. One of the most important results was a description of the change in the wear mechanisms and its intensity during the cavitation exposure time. At first plastic micro deformation of the material’s surface occurred, then the plastic deformation increased significantly and after some time this resulted in erosion of the material and interfacial boundary decohesion; these two effects increased simultaneously. The last of the mechanisms was mechanical destabilization of the austenite, but the clear result of the mechanical destabilization of the austenite was only observed in the last sample. Martensitic transformation of the material changed the material’s mechanical properties, but for the stainless steels this resulted in electrochemical corrosion of the material, especially through the formation of an electrochemical potential between austenite and martensite.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 30-35
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Microstructure in High Temperature Tribology of Iron Alloys
Autorzy:
Krawczyk, J.
Rożniata, E.
Zimowski, S.
Kot, M.
Dąbrowski, R.
Dziurka, R.
Frocisz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/355366.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microstructure
tribology
iron alloys
cast steel
wear
cementite
Opis:
The present paper describe the issue of tool materials wear in a high temperature conditions. The investigations were performed at the cast steel tool material at the tribological contact to the structural steel. The investigations aim was to determine the role of microstructure in a tribological properties between the structural steel and tool material. The results of such investigation could be referenced to the industry conditions and could answer about the problems of tool materials wear. The observations of the wear mechanisms were referred to the microstructure of the mill rolls. The laboratory tests ware aimed at evaluating the thermal treatment modification effect on the cast steels properties. A significant role of the morphology of ledeburitic cementite and secondary cementite on the tribological properties was exhibited. The investigations assumed the presence of an austenitic matrix with primary and secondary cementite. Influence of varying morphology carbides was described. in the cast steel microstructure. The investigation results make possible to point to a direction of carbide morphology change with the purpose of obtaining the assumed properties of hot operation tools.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 915-920
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of the joints’ properties of thick-grained steel welded by the SAW and ESW methods
Autorzy:
Krawczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/353496.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
properties of joints
fine-grained types of steel
non-destructive
destructive testing
optimizing a process of welding
Opis:
The article presents an analysis of properties of welded joints of thick-grained steel of P460NH type used more and more often in the modern constructions. A process of examining a technology of welding has been carried out on the thick-walled butt joints of sheet metal by two methods of welding namely submerged arc welding (SAW - 121) and electroslag (ESW - 722). The article deals with a topic of optimizing a process of welding thick-walled welded joints of fine-grained steel due to their mechanical properties and efficiency.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 419-426
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of the Quality of the Thick-Walled S355J2+N Steel Joint Welded by the MAG Method
Autorzy:
Krawczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/353891.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
properties of joints
structural steel
non-destructive testing
destructive testing
optimizing welding conditions
Opis:
An analysis of the quality of the thick-walled S355J2+N steel welded joint used most frequently in the general-building, power and other contemporary steel constructions is presented in the following article. A process of examining welding technologies was made on the tick-walled butt joints of plates by using the MAG – 135 welding method. The aim of the discussed topic was to optimize the process of welding thick-walled welded joints due to their mechanical strength properties and efficiency.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 833-839
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis Procedure of the Positronium Lifetime Spectra for the J-PET Detector
Autorzy:
Dulski, K.
Zgardzińska, B.
Białas, P.
Curceanu, C.
Czerwiński, E.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska-Kamińska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Mohammed, Muhsin
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Sharma, N.
Sharma, S.
Shivani, Shivani
Shopa, R.
Silarski, M.
Skurzok, M.
Wieczorek, A.
Wiślicki, W.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/1033298.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Kf
13.30.Ce
14.60.-z
78.47.-p
Opis:
Positron annihilation lifetime spectroscopy has shown to be a powerful tool to study the nanostructures of porous materials. Positron emission tomograph is a device allowing imaging of metabolic processes e.g. in human bodies. A newly developed device, the Jagiellonian PET will allow positron annihilation lifetime spectroscopy in addition to imaging, thus combining both analyses providing new methods for physics and medicine. In this contribution we present a computer program that is compatible with the Jagiellonian PET software. We compare its performance with the standard program LT 9.0 by using positron annihilation lifetime spectroscopy data from hexane measurements at different temperatures. Our program is based on an iterative procedure, and our fits prove that it performs as good as LT 9.0.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1637-1640
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Causes of the cracks in the pipeline made of the 15HM steel
Autorzy:
Słania, J.
Krawczyk, R.
Gątarek, M.
Powiązania:
https://bibliotekanauki.pl/articles/354316.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pipeline
cracks
welding process
welded joint
welding defects
Opis:
Issues referring to cracks in the pipelines made of the 15HM steel are described. Metallographic specimen of welded joints are provided. The results of impact strength tests, hardness tests and static tensile tests are given. Tests results as well as direct and indirect causes of the pipeline cracks are shown.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 99-104
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feasibility of FPGA to HPC computation migration of plasma impurities diagnostic algorithms
Autorzy:
Linczuk, P.
Krawczyk, R. D.
Zabolotny, W.
Wojenski, A.
Kolasinski, P.
Pozniak, K. T.
Kasprowicz, G.
Chernyshova, M.
Czarski, T.
Powiązania:
https://bibliotekanauki.pl/articles/226512.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plasma diagnostic
GEM system
feedback loops
Intel Xeon
Intel Xeon Phi
high performance computing HPC
Opis:
We present a feasibility study of fast events parameters estimation algorithms regarding their execution time. It is the first stage of procedure used on data gathered from gas electron multiplier (GEM) detector for diagnostic of plasma impurities. Measured execution times are estimates of achievable times for future and more complex algorithms. The work covers usage of Intel Xeon and Intel Xeon Phi - high-performance computing (HPC) devices as a possible replacement for FPGA with highlighted advantages and disadvantages. Results show that less than 10 ms feedback loop can be obtained with the usage of 25% hardware resources in Intel Xeon or 10% resources in Intel Xeon Phi which leaves space for future increase of algorithms complexity. Moreover, this work contains a simplified overview of basic problems in actual measurement systems for diagnostic of plasma impurities, and emerging trends in developed solutions.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 3; 323-328
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
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