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Wyszukujesz frazę "long-term research" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Resources of dead wood on surfaces for long-term research in the Kampinos National Park
Autorzy:
Torzewski, K.
Otręba, A.
Powiązania:
https://bibliotekanauki.pl/articles/2130348.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Tematy:
dead wood
Kampinos National Park
long-term research
strict and active protection
Opis:
The research covered 46 areas (each 400 sq.m) located in nine regions of the Kampinos National Park. This research is the result of field work carried out three times in years: 2007, 2012 and 2018. Dead wood measurements are one of the elements of testing on solid surfaces, which also includes vegetation, soil and stand. The average dead wood content in the Kampinos National Park over the past 11 years on long-term surfaces increased by 53% (from averages 35.59 m3/ha in 2007 to 54.37 m3/ha in 2018). Areas located in strictly protected zones showed greater abundance of dead wood in relation to the surface in active protection, and this difference is significant. On the surfaces covered by both forms of protection, during 11 years of research an increase in dead wood resources was noted, but only in areas covered by active protection it was statistically significant. In terms of the type of stand, oak stands with the average thickness of standing and lying wood in 2018 amounting to 110.70 m3/ha are the richest in dead wood, and the poorest pine stands with an average of 20.07 m3/ha. The results obtained on solid surfaces indicate a much greater richness of dead wood in the forests of the Kampinos National Park compared to the lowland state forests. However, due to the relatively small number of areas covered by the study, this work contributes to the knowledge of dead wood resources in this area and does not exhaust the need for a complete inventory.
Źródło:
Steciana; 2018, 22, 4; 211-216
1689-653X
Pojawia się w:
Steciana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Długoczasowe badania detektorów UV z TiO2
Long term tests of UV detectors based on TiO2
Autorzy:
Ćwirko, J.
Ćwirko, R.
Powiązania:
https://bibliotekanauki.pl/articles/158405.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
detektor UV
charakterystyki widmowe
badania długoczasowe
UV detector
spectral characteristics
accurate long-term research
Opis:
Detektory UV są stosowane w sprzęcie wojskowym - w konstrukcjach broni inteligentnych, stacjonarnych i indywidualnych środkach ochrony chemicznej i biologicznej czy w systemach detekcji rakiet balistycznych i sterowaniu ogniem artyleryjskim. Podstawowym parametrem detektora jest kształt charakterystyki czułości widmowej. W artykule przedstawiono wyniki eksperymentalnych badań detektorów UV wykonanych z TiO2. Badania dotyczyły wpływu długoczasowego wygrzewania w podwyższonej temperaturze oraz wpływu pobudzeń optycznych na charakterystyki widmowe detektorów. Dla porównania przestawiono wybrane wyniki badań detektorów wykonanych z SiC oraz GaN. W pracy opisano zrealizowane stanowisko badawcze umożliwiające poddawanie detektorów UV długotrwałym narażeniom termicznym i optycznym oraz stanowisko pomiarowe do rejestracji ich charakterystyk widmowych.
UV detectors are used in military equipment - in the construction of smart weapons, fixed and individual plant protection chemical and biological detection systems, or in ballistic missile and artillery fire control. The design of the detectors is mainly based on semiconductor materials with a wide gap. In the presented study the authors decided to focus on the effects of elevated temperatures during operation and long-lasting impact of strong optical excitation on the characteristics of spectral detectors. This paper describes the realized research station enabling subjecting the UV detectors to long-term thermal/optical exposures (Fig. 1) as well as measuring and recording the position of their spectral characteristics (Figs. 2, 3). The presented accurate long-term studies are performed as follows: the test detector is thermally and / or optically activated - total stimulation cycle can take up to several weeks. This cycle is divided into periods of time - after this time, in the ambient temperature, there is recorded the spectral characteristic of the detector. This way you can observe how gradually changes the course of the detector spectral characteristic changes gradually in relation to the characteristic recorded before the start of excitation. The paper presents the results of experimental studies of the UV detectors made of TiO2 (Figs. 4-6). For comparison, there are presented the selected results of investigations of the detectors made of SiC and GaN (Figs. 4, 6). The tested detectors were also subjected to long-term optical excitation - the source of radiation was a xenon lamp of 450 W power (Fig. 9). The basic parameter of the detector is the shape of the spectral sensitivity. Accurate long-term tests allow obtaining additional information in terms of using these detectors in special applications.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 9, 9; 741-744
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura i dynamika wielogeneracyjnych starodrzewów sosnowych występujących w obszarach ochrony ścisłej Kaliszki i Sieraków w Kampinoskim Parku Narodowym. Część 1. Zróżnicowanie gatunkowe, zagęszczenie i pierśnicowe pole przekroju
Structure and dynamics of uneven−aged Scots pine−dominated old−growth stands in Kaliszki and Sieraków strict protection areas in the Kampinos National Park. Part 1. Species composition, tree density and basal area
Autorzy:
Brzeziecki, B.
Zajączkowski, J.
Olszewski, A.
Bolibok, L.
Andrzejczyk, T.
Bielak, K.
Buraczyk, W.
Drozdowski, S.
Gawron, L.
Jastrzębowski, S.
Szeligowski, H.
Żybura, H.
Powiązania:
https://bibliotekanauki.pl/articles/978936.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
forest dynamics
long−term research
old−growth forest
permanent study plot
strict protection
tree
species composition
Opis:
The paper describes changes, which took place over the last 30 years in old−growth forest stands occupying two permanent research plots, established in the Kaliszki and Sieraków strict protection areas in the Kampinos National Park (central Poland). Both plots have a form of ecological transects. The Kaliszki plot is 20 m wide and 700 m long (1.40 ha), while the Sieraków plot (total area of 2.56 ha) consists of two parts: main (40×460 m) and side (40×180 m) transect. In the Kaliszki plot, the stand measurements were conducted in 1993, 2007, and 2017, while in the Sieraków plot – in 1989, 1994, 2006, and 2017. For every tree with breast height diameter (DBH) 5 cm, species identity, DBH and spatial coordinates were determined. Starting from the second census, all trees which had died (‘losses’), as well as trees which exceeded the DBH threshold (‘gains’) since the previous record were noted, as well. The major tree species occurring on sample plots are Scots pine (Pinus sylvestris), pedunculate oak (Quercus robur), silver and downy birch (Betula sp.), and black alder (Alnus glutinosa). During the study period, the overall tree density declined by ca. 50%. The diminishing trends occurred for all dominant tree species. In contrast to major, dominant tree species, the demographic status of a group of minor tree species (lime, hornbeam and maple) was much more stable. One may even speak about some expansion in this case. Particularly, hornbeam density increased rapidly in the period 2006−2017 in some areas of the main transect located in the Sieraków plot. The future studies will show if this tendency will be maintained and will include other regions of sample plots. Assuming a lack of significant disturbances, one may expect that the stands growing on research plots will rather slowly change in the nearest future. Most dynamics will have a quantitative and not qualitative character. One may anticipate, for example, a growing role of pedunculate oak at the expense of Scots pine, however, considering that the two species are rather long−living, they will probably for a long time keep their dominant roles in the stand canopies.
Źródło:
Sylwan; 2020, 164, 05; 392-403
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany leśnych zbiorowisk roślinnych w latach 1959-2016 na stałej powierzchni badawczej w oddziale 319 Białowieskiego Parku Narodowego
Changes of woodland plant communities during the period 1959-2016 on the permanent study plot in the compartment 319 of the Bialowieza National Park
Autorzy:
Ciurzycki, W.
Brzeziecki, B.
Zaniewski, P.T.
Keczyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/985936.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
parki narodowe
Bialowieski Park Narodowy
fitosocjologia
zbiorowiska roslinne
zbiorowiska lesne
stale powierzchnie badawcze
zespol Tilio-Carpinetum
zespol Serratulo-Pinetum
zmiany florystyczne
lata 1959-2016
community decline
floristic ordination
long−term research
serratulo−pinetum
tilio−carpinetum
strict
protection
Opis:
The long−term changes of vegetation cover at the level of woodland community taking place between 1959 and 2016 on the permanent study plot located in the compartment 319 of Białowieża National Park are discussed. In 1959 two distinctive woodland community types occurring on sample plot were distinguished: subboreal mixed pine−oak forest (Serratulo−Pinetum) and hornbeam−lime forest (Tilio−Carpinetum). The phytosociological investigations, carried out almost 60 years later, revealed that in case of both communities, significant, directional changes of their floristic composition took place. Particularly high rate of change occurred in case of the phytocoenosis representing the Serratulo−Pinetum community. In 1959 it contained a full set of characteristic plant species. During the study period, this community type representing the Vaccinio−Piceetea class, was replaced by the initial form of lime−hornbeam forest belonging to the Querco−Fagetea class. Also, in case of the previous Tilio−Carpinetum association, the significant changes in the floristic composition occurred, although not as large as in case of Serratulo−Pinetum community. 60 years ago this community type contained several plant species typical for thermophilous oak forests. Nowadays, it represents a typical form of lime−hornbeam association. The changes in both community types were mainly related to the strong expansion of lime and hornbeam, which took place during the study period and involved the whole study plot. As a result, the vegetation occurring on the study plot is much more homogenous now than it was ca. 60 years ago. The maintenance of Serratulo−Pinetum phytocoenoses distinguished by a high floristic diversity calls for active protective measures in all cases where such measures are allowed and where this community type can potentially develop.
Źródło:
Sylwan; 2018, 162, 11; 907-914
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany flory roślin naczyniowych runa leśnego w latach 1959-2016 na stałej powierzchni badawczej w oddziale 319 Białowieskiego Parku Narodowego
Changes of herb layer vegetation during the period 1959-2016 on the permanent study plot in the compartment 319 of Bialowieza National Park
Autorzy:
Brzeziecki, B.
Ciurzycki, W.
Keczyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/985863.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Bialowieski Park Narodowy
badania florystyczne
stale powierzchnie badawcze
runo lesne
flora
gatunki rzadkie
gatunki chronione
zmiany skladu gatunkowego
lata 1959-2016
biodiversity loss
ground vegetation
long−term research
protected plant species
rare plant species
red
list species
strict protection
Opis:
Changes in the herbaceous layer (vascular plants), taking place between 1959 and 2016 on the permanent study plot in the compartment 319 of the Strict Reserve in the Białowieża National Park are presented. Zaręba [1972] presented phytosociological research carried out in 1959 on the 1.2 ha plot. The author established 10 relevés (size between 100 and 400 m2), in which in total 91 different species of vascular plants were noted. In 2016, the similar study was conducted, using slightly modified methods (the inventory of plants involved the total area of the study plot). The comparison of data recorded during both investigations revealed that the total number of plant species declined from the initial 91 to current 83. During the ca. 60−year long period, 43 plant species disappeared completely and were replaced by 35 new species. In the declining group, almost the half (20) were species important from the point of view of nature conservation, including four Red List species (Arnica montana, Goodyera repens, Lathyrus laevigatus, Trolius europaeus), 10 plant species protected by law, and several other precious species related to rare and declining woodland community types. The obtained results confirm the findings of other authors describing unfavourable changes in the flora of the Białowieża Forest during the past several tens of years. The floristic richness is an important part of the overall biodiversity of Białowieża Forest. It appears that strict protection does not secure the maintenance of this key component. Thus, an attempt to preserve diverse values of Białowieża Forest on a sustainable basis should, first of all, look for a proper balance between strict and active protection. The later can (and should) be integrated within the multifunctional forest management, conducted on the prevailing area of the Białowieża Forest.
Źródło:
Sylwan; 2018, 162, 12; 980-988
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Instytut Łączności - państwowym instytutem badawczym
National Institute of Telecommunications becomes a state research institute
Autorzy:
Hildebrandt, A.
Powiązania:
https://bibliotekanauki.pl/articles/317768.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
państwowy instytut badawczy
program wieloletni
Instytut Łączności
state research institute
long-term program
National Institute of Telecommunications
Opis:
Wymieniono zadania, jakie realizuje Instytut Łączności po uzyskaniu statusu państwowego instytutu badawczego. Podkreślono znaczenie programu wieloletniego przygotowanego przez Instytut Łączności.
The paper presents tasks being fulfilled by National Institute of Telecommunications after being granted the status of state research institute. The importance of long-term program prepared in advance by National Institute of Telecommunications is outlined.
Źródło:
Telekomunikacja i Techniki Informacyjne; 2005, 3-4; 3-5
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operations research in open-pit mining
Badania operacyjne w górnictwie odkrywkowym
Autorzy:
Maksymowicz, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2030555.pdf
Data publikacji:
2020
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
decision-making processes
operations research
open-pit mining
optimization
modeling
simulations
long-term planning
short-term planning
losed-loop management
equipment allocation
mining software
proces podejmowania decyzji
badania operacyjne
górnictwo odkrywkowe
optymalizacja
modelowanie
symulacje
planowanie długoterminowe
planowanie krótkoterminowe
zamknięta pętla w zarządzaniu
alokacja maszyn i urządzeń
oprogramowanie dla górnictwa
Opis:
In striving to maximize profits, maximize safety and to meet environmental requirements, management decisions being made in surface mining industry should always be optimal. Operations research, as a discipline supporting the decision-making processes helps to achieve this. In this paper, basic issues related to operations research in open-pit mining are explained. Significance of the operations research is emphasized, presenting the wide range of its applications in open-pit mining industry.
Dążąc do maksymalizacji zysków, maksymalizacji bezpieczeństwa oraz spełnienia wymagań środowiskowych, decyzje zarządcze podejmowane w górnictwie odkrywkowym powinny być zawsze optymalne. Badania operacyjne - jako dyscyplina wspierająca procesy decyzyjne, pomagają to osiągać. W artykule wyjaśniono podstawowe zagadnienia dotyczące badań operacyjnych w branży górnictwa odkrywkowego oraz podkreślono ich znaczenie, przedstawiając szeroki wachlarz zastosowań.
Źródło:
Górnictwo Odkrywkowe; 2020, 61, 3; 31--38
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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