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Tytuł:
Koncepcja osiedlowego placu zabaw dla dzieci w wieku 3-6 lat spełniającego normy bezpieczeństwa
The concept of neighborhood playground for children aged between 3-6 years, complying with safety standards
Autorzy:
Ubowska, A.
Łukaszewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/103660.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
bezpieczeństwo dziecka
plac zabaw
safety of children
playgrounds
Opis:
Bezpieczeństwo dzieci leży na sercu każdemu z nas. Jak wynika ze statystyk, wypadki na placach zabaw, pod względem liczby, stanowią trzecią w kolejności grupę wypadków z udziałem dzieci. Tym bardziej istotne jest, aby place zabaw były nie tylko funkcjonalne i atrakcyjne, ale też bezpieczne. Aby zapewnić najmłodszym bezpieczeństwo, przy projektowaniu placów zabaw mamy do dyspozycji dwie normy: PN-EN 1176 i PN-EN 1177, które podają między innymi wytyczne dotyczące poszczególnych elementów wyposażenia, w tym nawierzchni. Mając na uwadze obowiązujące normy, zaprojektowano plac zabaw (działka o powierzchni 154 m²), który może być przeznaczony dla zabudowy mieszkalnej do 75 osób. Przy urządzaniu placu zabaw poszczególne elementy dobrano tak, aby nie tylko w maksymalny sposób zmniejszyć ryzyko bawiących się na nim dzieci, ale również by wyposażenie było przystępne dla potencjalnych inwestorów.
The safety of children is at heart of each of us. According to the statistics, accidents on playgrounds are the third biggest group of accidents involving children. Of paramount importance is that playgrounds are to be not only functional and attractive but also safe. To ensure the safety of the youngest, the design of playgrounds should take into consideration two standards: EN 1176 and EN 1177, which include guidelines for individual pieces of equipment, including the ground surface. Complying with current standards, children's playground with the allotment of 154 m² was designed, suitable for residential development up to 75 people. When arranging the playground individual components were carefully selected not only to maximally reduce the risk of injury, but also to reduce costs and be more affordable for potential investors.
Źródło:
Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2013, T. 1; 421-432
2300-5343
Pojawia się w:
Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wzbogacenia paszy algami morskimi i siemieniem lnianym na skład morfologiczny i cechy fizykochemiczne jaj przepiórek japońskich
Effect of enriching feeds with algae marine and linseed on morphological composition and physical and chemical characteristics of Japanese quail eggs
Autorzy:
Trziszka, T.
Lukaszewicz, E.
Bobak, L.
Kowalczyk, A.
Adamski, M.
Dobrzanski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/826589.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Technologów Żywności
Opis:
Badano wpływ zastosowania alg morskich i siemienia lnianego, jako źródła kwasów tłuszczowych, w żywieniu nieśnych przepiórek japońskich (Coturnix coturnix japonica), w aspekcie poprawy cech fizycznych jaj oraz zawartości cholesterolu i profilu kwasów tłuszczowych w żółtkach. Od 6. tygodnia życia ptaki z grupy kontrolnej (240 samic podzielonych na 6 powtórzeń) otrzymywały ad libitum standardową mieszankę typu G-090 (Granum Animals Nutrition, Polska). Grupa doświadczalna (w takim samym układzie) otrzymywała tę samą paszę, lecz wzbogaconą w algi morskie (DHA Gold, Novus, Polska) i siemię lniane, w ilości odpowiednio: 5 i 40 g oraz 0,3 g drożdży selenowych (jako antyutleniacz) na 1 kg mieszanki. Jaja pobierano do badań w 9. (I okres), 13. (II okres) i 17. (III okres) tygodniu nieśności, czyli w 16., 20. i 24. tyg. życia. W trzech okresach nieśności oceniano parametry fizyczne każdej grupy jaj (masa jaja, żółtka, skorupy i białka, barwa żółtka, wytrzymałość i grubość skorupy) i profil kwasów tłuszczowych, które oznaczano przy użyciu chromatografu gazowego sprzężonego ze spektrometrem masowym (GC/MS). Analizę cholesterolu wykonano z użyciem chromatografu cieczowego HP (firmy Agilent Technologies). Wzbogacenie diety przepiórek japońskich w siemię lniane i algi morskie nie miało wpływu na skład morfologiczny i fizyczne parametry jaja (masę jaja, udział białka, żółtka i skorupy, grubość i wytrzymałość skorupy), spowodowało natomiast istotne obniżenie kwasowości czynnej (pH) białka i żółtka. Ponadto zastosowane dodatki paszowe wpłynęły na istotne zmniejszenie zawartości cholesterolu w żółtku, dwukrotne zwiększenie w nich zawartości kwasu DHA oraz 3 - 4 krotne obniżenie stosunku n-6/n-3, co jest bardzo istotne z uwagi na wartość odżywczą i technologiczną jaj.
The effect was studied of the application of algae marine and linseed as a source of fatty acids to feeding Japanese quail hens (Coturnix coturnix japonica) in terms of improving physical characteristics of eggs as well as the content of cholesterol and fatty acid profile in the yolk. Once the birds from a control group (240 females, divided into 6 replicates) were 6 weeks old, they were given ad libitum a standard G090 feed (Granum Animals Nutrition, Poland ). The experimental group (of the same structure) received the same feed, which, however, was enriched with algae marine (DHA Gold, Novus, Poland ) and linseed in the amount of 5 g and 40 g, respectively, plus 0.3 g of selenium yeast (as an antioxidant) per 1 kg of feed. For further analysis, the eggs were collected in the 9th (period I), 13th (period II), and in the 17th week (period III) of production, i.e. in the 16th, 20th, and 24th week of age. During the three egg-laying periods, physical parameters of eggs in each group were assessed (weight of egg, of shell, of yolk and of egg white, yolk colour, and shell strength and thickness) as was the fatty acid profile; those parameters were determined by a gas chromatograph coupled with a mass spectrometer (GC/MS). Cholesterol was analyzed using an HP liquid chromatograph (produced by Agilent Technologies). Enriching the feed of Japanese quail with algae marine and linseed had no effect on the morphological composition and physical parameters of egg (egg weight, percent contents of egg white, yolk and shell, thickness and strength of the shell), but it caused the active acidity (pH) of the egg white and yolk to significantly decrease. In addition, the applied additives caused the cholesterol level in the yolk to significantly decrease, the content of DHA acid in yolk to double its amount, and the n-6/n-3 ratio to decrease 3-4 times, what is very important as regards the nutritional and technological value of eggs.
Źródło:
Żywność Nauka Technologia Jakość; 2014, 21, 6
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of mechanical activation and heat treatment on surface development and oxide layer thickness of Ti6Al4V ELI alloy
Autorzy:
Szota, M.
Łukaszewicz, A.
Bukowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/367022.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
surface engineering
titanium alloys
heat treatment
mechanical activation
inżynieria powierzchni
stopy tytanu
obróbka cieplna
aktywacja mechaniczna
Opis:
Purpose: The paper presents the results of mechanical activation of the surface on oxide layer thickness after heat treatment of TU6Al14V ELI alloy. Design/methodology/approach: Specimens were made from 5 mm diameter rod cut into semicircular slices. The samples were mechanically activated throughout mechanical treatment of the surface: one sandblasted with glass beads during 5 minutes and other ground with sandpaper grit 40, 180, 220 and 800 during 7.5 and 15 minutes. Findings: Then microstructure of specimens etched with Kroll solution was observed using an optical microscope and roughness parameters of the surface were measured. Research limitations/implications: Afterwards heat treatment (550°C, 5 hours) was conducted, then roughness parameters and thickness of the oxide layer were measured by means of a scanning microscope. Practical implications: The conducted research showed up that mechanical activation of the surface which cause an increase of surface development results in greater thickness of the oxide layer which is formed during heat treatment. Nevertheless, mechanical activation that results in a decrease of surface development, such as polishing, results in a decrease of oxide layer thickness. Originality/value: The results of the research can be used to obtain the desired thickness of the oxide layer in the production of the elements that require increased wear and corrosion resistance.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 97, 2; 69-76
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The possibility to control the thickness of the oxide layer on the titanium Grade 2 by mechanical activation and heat treatment
Autorzy:
Szota, M.
Łukaszewicz, A.
Machnik, K.
Powiązania:
https://bibliotekanauki.pl/articles/366750.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
titanium alloys
oxide layer
titanium passivation
surface mechanical activation
heat treatment
stopy tytanu
warstwa tlenkowa
pasywacja
mechaniczna aktywacja powierzchni
obróbka cieplna
Opis:
Purpose: The paper presents the results of microstructure, surface development and thickness of the oxide layer on the pure titanium Grade 2 after mechanical activation and heat treatment (550°C/5h). Design/methodology/approach: Studies show that it is possible to control the thickness of the oxide layer by using different materials to change the roughness of surface - mechanical activation before heat treatment. After mechanical activation and heat treatment, the results of the thickness of the oxide layer as well as a level of surface development were obtained, presented and discussed. Findings: The conducted research have proved that mechanical activation of the surface which cause increase of surface development results in greater thickness of oxide layer which is formed during heat treatment. Nevertheless mechanical activation that results in decrease of surface development, such as polishing, results in decrease of oxide layer thickness. Research limitations/implications: The conducted research have showed up that mechanical activation of the surface which cause increase of surface development results in greater thickness of oxide layer which is formed during heat treatment. Nevertheless, mechanical activation that results in decrease of surface development, such as polishing, results in decrease of oxide layer thickness. Practical implications: are possible using similar method for passivation titanium alloys for medical application. Originality/value: The paper presents the possibility of using mechanical preactivation of surface before heat treatment passivation.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2020, 100, 2; 70-77
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of ram-press pipe bending process using elasto-plastic fem model
Autorzy:
Sidun, J.
Łukaszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/386877.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
pipe bending
FEM analysis
finite element method
Opis:
In this paper selected aspects of numerical modelling of bending pipes process are described. Elasto-plastic material model was used in COMSOL FEM environment. The results of numerical analyses of two kinds of steel were presented. The correctness of the proposed model was verified based on comparison shapes of deformed pipe profile obtained at the ending step of bending both from numerical simulations and experiment.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 1; 47-52
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The follow-up posturography in rehabilitation after total hip arthroplasty
Autorzy:
Pethe-Kania, K.
Opara, J. A.
Kania, D.
Kidoń, Z.
Łukaszewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/307359.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rehabilitacja
kontrola postawy ciała
posturograf
symetria postawy
rehabilitation
postural control
posturography
follow-up posturography
postural symmetry
Opis:
Purpose: Presentation of the results of clinical study on new supplementary method applied in the physical rehabilitation of patients who underwent total hip arthroplasty. The standard rehabilitation program was supplemented with the lower limb loading symmetry training based on the follow-up posturography with an adaptively modified visual biofeedback, performed on a double plate posturographic platform. Methods: The research involved 60 randomly selected patients included in prospective and comparative clinical study in the scheme of the parallel groups. The subjects were divided into two groups comprised of 30 patients each. In both groups a conventional 21-day rehabilitation was carried out. Additionally, in experimental group the limb loading symmetry restoration training based on the follow-up posturography with an adaptively modified biofeedback was implemented. The biofeedback coefficient reflected the distribution of loading exerted on a given patient’s legs and was evaluated during the static posturography examinations carried out before each symmetry training session. Results: The eyes-open static posturography examinations indicated significant improvement in the lower limb loading symmetry in 29 (97%) patients from the experimental group ( p = 0.000003). In the control group, such an improvement was observed in 20 (67%) patients ( p = 0.034796). In the eyes closed examinations correction in the limb loading symmetry was evident in 23 (77%) patients from the experimental group ( p = 0.000247) and 18 (60%) patients from the control group ( p = 0.043327). Conclusions: Significant improvement in the lower limb loading symmetry was observed in patients who underwent rehabilitation supplemented with the herein discussed training method.
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 1; 97-104
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pochodzenie drzewostanów świerkowych (Picea abies L. Karst.) z Puszczy Białowieskiej na tle regionu RDLP Białystok na podstawie analiz mitochondrialnego DNA
Origin of the Norway spruce (Picea abies L. Karst.) stands from Bialowieza Forest at the level of Bialystok Regional Directorate of the State Forests based on mitochondrial DNA analysis
Autorzy:
Nowakowska, J.A.
Łukaszewicz, J.
Borys, M.
Tereba, A.
Konecka, A.
Zawadzka, A.
Sułkowska, M.
Zajączkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/987121.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Bialowieska
drzewostany swierkowe
drzewa lesne
swierk pospolity
Picea abies
markery genetyczne
DNA mitochondrialny
pochodzenie roslin
zmiennosc genetyczna
RDLP Bialystok
genetic diversity
mitochondrial dna marker
postglacial migration routes
białowieża forest
Opis:
Considered to be the most natural of all other Polish stands Picea abies in Białowieża Forest has suffered severely of bark beetle damages for decades. In order to find out some historical events in native Norway spruce stands diversity at regional level, we carried out the study on poly− morphism with DNA markers and performed Principal Coordinate Analysis (PCoA) on the basis of genetic distance matrix. Two ranges (i.e. Baltico−Nordic and Hercyno−Carpathian) of Norway spruce cover north−eastern and southern Poland, respectively. The spruceless zone separates the these two ranges in lowland Poland. From genetic point of view, the Baltico−Nordic P. abies populations mainly harbor mitochondrial haplotype ‘c', whereas the spruces from the Hercyno− −Carpathian range – haplotype ‘a'. Until recently, the Białowieża Forest has been considered to belong to the northern range of spruce occurrence in Europe. Seven populations from Biało− wieża Forest were studied (two of them from the Strict Reserve in Białowieski National Park) according to mitochondrial DNA diversity, and compared with genetic diversity found in 24 other populations located in Białystok Regional Directorate of the State Forests (north−eastern Poland). All studied spruce populations were more than 100 years old and were of natural origin. As result, the spruces from the Białowieża Forest harbored three mitochondrial haplotypes of the nad1 gene (‘c', ‘a' and ‘a1'), with the haplotype ‘a' being more frequently present (>51%) than the hap− lotype ‘c'. The spruce stands from Białowieża Forest have the highest gene diversity (h Nei=0.527) comparing to the other stands from the Białystok RDSF. The PCoA proved the particularity of the spruces from Białowieża Forest grouping them into one cluster of genetic similarity. Our data demonstrated that most of Norway spruces populations from Białystok RDSF harbor haplotype ‘c', which confirms their historical relationship with the Baltico−Nordic range of P. abies in Europe, while most spruces from Białowieża Forest have different historic origin, because they share high frequency of the southern haplotype ‘a'. It also turned out that Norway spruce pop− ulations from two different European ranges met in lowland Poland after the last glacial period, as proved by the presence of two mitochondrial haplotypes ‘a' and ‘c'. It can be assumed, that the spruceless zone was created by human activity in the past millennia. The results of all molecular analyses confirmed the unique character of spruces of Białowieża Forest, which is distinguished by the greater richness of the gene pool in comparison to the region of Białystok RDSF as well as good adaptation to local environmental conditions.
Źródło:
Sylwan; 2017, 161, 01; 40-51
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja pasywnego stanowiska do ćwiczeń wzroku
The concept of passive device for eyesight exercises
Autorzy:
Mikołajczyk, T.
Skornia, M.
Łukaszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/95530.pdf
Data publikacji:
2016
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
metoda Batesa
ćwiczenia wzroku
samoleczenie wzroku bez okularów
stanowisko wspomagające ćwiczenia wzroku
Bates method
eyesight exercises
natural eyesight improvement
auxiliary device
Opis:
Narząd wzroku to jeden z ważniejszych zmysłów, bez którego trudno funkcjonować w świecie. Wzrok jest bardzo wrażliwy i w wyniku zmian zachodzących z wiekiem, zmian chorobowych, nieprawidłowego korzystania widzenie może ulec pogorszeniu, a nawet zaniknąć całkowicie. Często zapominamy o niego dbać i coraz więcej osób dotkniętych jest wadą wzroku, na którą okuliści przepisują okulary. Są jednak inne metody pozwalające na uzyskanie, utrzymanie bardzo dobrej ostrości, a zarazem jakości widzenia. Należy do nich między innymi metoda Batesa. Opiera się ona na założeniu, że dzięki ćwiczeniom, które utrzymują mięśnie oka w dobrej kondycji, możliwe jest widzenie bez okularów. W pracy przedstawiono pasywne stanowisko z oprogramowaniem, które wspomaga realizację ćwiczeń wzroku wg koncepcji Batesa.
Eyesight is one of the most important senses, hard to exist without it. Eyesight is very sensitive and as a result of aging, sickness or inappropriate usage may get damaged partially or entirely. Very often we forget to care for it what causes more and more people getting affected by vision defects that ophthalmologists “cure” by prescribing glasses. There are methods though, that allow for improvement and sustenance of a very good eyesight sharpness. One of those is Bates method. Theory assumes that through exercises of eye muscles eyesight can be improved and glasses are not always necessary. In the thesis a few concepts of device with special software are presented that support Bates method exercises.
Źródło:
Postępy w Inżynierii Mechanicznej; 2016, 7(4); 67-77
2300-3383
Pojawia się w:
Postępy w Inżynierii Mechanicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 65 nm CMOS Resistorless Current Reference Source with Low Sensitivity to PVT Variations
Autorzy:
Łukaszewicz, M.
Borejko, T.
Pleskacz, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/397920.pdf
Data publikacji:
2012
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
efekt objętościowy
obwody zasilające
napięcie progowe
current reference
65 nm CMOS
body effect
power supply circuits
threshold voltage
Opis:
This paper describes a resistorless current reference source, e.g. for fast communication interfaces. Addition of currents with opposite temperature coefficient (PTC and NTC) and body effect have been used to temperature compensation. Cascode structures have been used to improve the power supply rejection ratio. The reference current source has been designed in a GLOBALFOUNDRIES 65 nm technology. The presented circuit achieves 59 ppm/°C temperature coefficient over range of -40°C to 125°C. Reference current susceptibility to process parameters variation is ± 2.88%. The power supply rejection ratio without any filtering capacitor at 100 Hz and 10 MHz is lower than -142 dB and -131 dB, respectively.
Źródło:
International Journal of Microelectronics and Computer Science; 2012, 3, 4; 119-124
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zimowanie ptaków w zabudowie wiejskiej i willowej na Równinie Kozienickiej
Wintering birds in rural and urban villa housing types on the Kozienicka Lowland
Autorzy:
Lukaszewicz, M.
Kuropieska, R.
Iwanczuk, C.
Moleda, M.
Szafranski, A.
Tecza, R.
Powiązania:
https://bibliotekanauki.pl/articles/32665.pdf
Data publikacji:
2013
Wydawca:
Mazowiecko-Świętokrzyskie Towarzystwo Ornitologiczne
Tematy:
ptaki
zimowanie ptakow
liczenie ptakow
sezon zimowy
zabudowa wiejska
sklad gatunkowy
populacje zwierzat
liczebnosc populacji
siedliska
Rownina Kozienicka
budynki jednorodzinne
Źródło:
Kulon; 2013, 18
1427-3098
Pojawia się w:
Kulon
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From the heap to the park - reclamation and adaptation of degraded urban areas for recreational functions in Poland
Autorzy:
Lukaszewicz, J.
Fortuna-Antoszkiewicz, B.
Dlugonski, A.
Wisniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/887391.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Scientific Review Engineering and Environmental Sciences; 2019, 28, 4[86]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena rębni gniazdowej na podstawie drzewostanów uszkodzonych w lasach nizinnych Polski
Evaluation of the group cutting system on the basis of damaged forests in lowland Poland
Autorzy:
Łukaszewicz, J.
Niemczyk, M.
Dmyterko, E.
Bruchwald, A.
Powiązania:
https://bibliotekanauki.pl/articles/989687.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
przebudowa drzewostanow
rebnie gniazdowe
rebnie czesciowe gniazdowe
drzewostany nizinne
uszkodzenia drzewostanow
czynniki abiotyczne
czynniki biotyczne
group cutting system
sawtimber stand
demaged stand
Opis:
The paper compares the proportion of damaged stands managed under group cutting system (group clear cutting and group shelterwood cutting) with the analogous stands where cuts had not been performed. The empirical material came from the database of the State Forests Information System and covered all forest districts located in Polish lowlands. To evaluate the group cutting a test of differences between the fractions of the elements distinguished in the population was used. The first population involved sawtimber stands in which no group cuts had been performed in the past decade. The number of damaged stands was determined for this population and their percentage share was established. A similar procedure was applied to the second population of stands in which the group cutting was employed. A damaged stand was assumed to be one in which the volume of windbroken and windfallen trees and deadwood harvested in the past 10 years exceeded the volume set in the given formula (1). The performed analysis shows that after several years, the proportion of damaged stands in which gaps were established is significantly higher (57.2%) than in the stands without cut patches (32.9%). Stands with patches demonstrate a significant, statistically greater susceptibility to damage from abiotic and biotic factors. The proportion of damaged stands managed under the group shelterwood cutting (60%) is larger than that under the group clear cutting (55.4%). Spruce is the most vulnerable to damage, while alder − the least vulnerable. On average, the higher proportion of damaged forests, mainly pine and oak forests is in the territory of the Bialystok Regional Directorate of the State Forests (RDSF) (tab. 2) being lower in the territory of the Warsaw RDSF where damaged pine stands are more frequent (tab. 3). In areas with a high probability of damage to stands group cut should be limited, and in spruce stands – totally abandoned. Time regimes should also be established applying the group cutting by shortening the period of reconstruction of the entire forest stand.
Źródło:
Sylwan; 2015, 159, 01; 3-12
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany składu gatunkowego i struktury drzewostanów w Roztoczańskim Parku Narodowym w okresie 2007-2017
Changes in the species composition and structure of forest stands in the Roztocze National Park in the years 2007-2017
Autorzy:
Łukaszewicz, J.
Zajączkowski, G.
Gil, W.
Tittenbrun, A.
Radliński, B.
Powiązania:
https://bibliotekanauki.pl/articles/979113.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
forest dynamics
species composition
dbh distribution
permanent plot
strict protection
Opis:
The aim of the study is to analyze changes in the species composition and in the diameter structure of the main forest−building species in the Roztocze National Park (central−eastern Poland). The research was carried out on 315 permanent monitoring plots. The range of collected data included: type of protection (strict and active protection), forest site type, tree species and their dbh (>7 cm over bark). Measurements and observations were made in 2007 and repeated in 2017. There was a significant reduction in the number of all tree species, except of beech Fagus sylvatica, regardless the protection status. Despite this, the basal area for the strict and active protection zone was similar both in 2007 (37.77 and 36.39 m2/ha, respectively) and 2017 (37.17 and 37.85 m2/ha, respectively). In the whole park, the number of large trees (mainly beeches) with high individual basal area increased, while the number of young generations of all species decreased. In the strict protection zone, the admixture species (decrease by 27.3%), as well as hornbeam Carpinus betulus (decrease by 22.8%), are not particularly competitive with beech. A similar tendency, although mitigated by active silvicultural treatments, was also observed in the active protection zone, in which admixture species have lost 24.8% while hornbeam 16.2%. In the strict protection area, there was a significant reduction in the number of fir Abies alba (by 14%). In the active protection zone fir increased its range and basal area, and maintains its population practically unchanged. There was also a decrease in the number of young generations, as evidenced by changes in the frequency in the 7−16 cm dbh class. The highest level of reduction in this class was found for pine Pinus sylvestris (by 64.8%), rare species (40.4%), hornbeam (31.2%), oak Quercus robur (26.6%), and spruce Picea abies (20.5%). Only beech increased the abundance in this class (by 1.4%) as well as in the next 17−26 cm class (even by 14.2%). The presented significant changes in the species composition and structure of basal area of the stands in the Roztocze National Park that occurred in the 10−year period, indicate a significant role of tending cuts in maintaining proper species composition, appropriate diameter structure of stands, their stability of natural richness and high level of diversity of forest ecosystems.
Źródło:
Sylwan; 2020, 164, 08; 683-694
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Greeks under the Pyramids, or a Princess in a Brothel
Autorzy:
Lukaszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/702826.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
GREEK HISTORIOGRAPHY
PYRAMIDS -FACTS & MYTHS
Opis:
The article is devoted to facts and myths about the pyramids, their origin and the way in which they were built, as related by Herodotus, Strabo, Diodorus and Pliny the Elder.
Źródło:
Meander; 2005, 60, 3; 338-349
0025-6285
Pojawia się w:
Meander
Dostawca treści:
Biblioteka Nauki
Artykuł
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