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Wyświetlanie 1-15 z 22
Tytuł:
Metoda oceny wskaźnika powierzchni liści z zastosowanim lotniczego skaningu lidarowego
Method for assessing of leaf area index using lidar data
Autorzy:
Popov, M.
Semko, I.
Kozak, I.
Powiązania:
https://bibliotekanauki.pl/articles/35944.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
drzewostany sosnowe
powierzchnia lisci
wskaznik powierzchni lisciowej
lotniczy skaning lidarowy
regresja wielokrotna
pine stand
leaf area
leaf area index
multiple regression
Opis:
Zaproponowana została metoda zdalnej oceny LAI z zastosowaniem materiałów lotniczego skaningu lidarowego. Obliczeniowa część metody opiera się na modelu regresji pomiędzy wartościami wskaźnika LAI i danymi lotniczego skaningu lidarowego. Opracowane zostały równania regresji wielokrotnej. Przedstawione zostały wyniki testowania proponowanej metody, które potwierdzają jej wydajność i wysoką dokładność. Przedstawiony został przegląd nowoczesnych metod oceny wskaźnika powierzchni liści (LAI) – jednego z najbardziej kompleksowych i obiektywnych wskaźników produkcyjnej aktywności roślinności. Krótko opisano naziemne metody oceny LAI oraz ich oprzyrządowanie. Zauważono, że główną i niewątpliwą zaletą naziemnej metody oceny LAI jest wiarygodność uzyskanych wyników. Przy konieczności oceny poziomu aktywności roślinności na dużych obszarach i przy ograniczonych zasobach czasowych, zastosowanie technik naziemnych napotyka poważne trudności. W takich przypadkach bardziej obiecującym okazuje się podejście związane z zastosowaniem zdalnych technik i technologii. Pokazano kierunki ewentualnych dalszych kroków do zwiększenia dokładności metody.
A remote sensing method for assessing LAI index using airborne lidar data is proposed. A calculation body of the proposed method is based on regression model which couples LAI value and lidar data derivatives. Multiple regression equation is constructed. The results of experi-mental investigation confirm the effectiveness and high accuracy of the proposed method. The paper presents a review of the contemporary approaches to the assessment of leaf area index (LAI) as one of most comprehensive and objective indicators of photosynthesis processes activity of vegetation. Methods for LAI in-situ assessing, its procedures and instrumental support are described in brief. It is emphasized that the main and absolute advantage of in-situ methods is the reliability of calculated LAI estimates. However, the application of in-situ methods is connected with significant problems when it is necessary to assess photosynthesis processes activity level for vegetation in cases of vast areas with time limitations. As the authors observe, for similar cases is more promising to use remote sensing techniques and technologies. Directions for further research to improve the precision of the method are outlined therewith.
Źródło:
Acta Agrophysica; 2014, 21, 2
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On integrability in F-spaces
Autorzy:
M. Popov, Mikhail
Powiązania:
https://bibliotekanauki.pl/articles/1290202.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
Some usual and unusual properties of the Riemann integral for functions x : [a,b] → X where X is an F-space are investigated. In particular, a continuous integrable $l_p$-valued function (0 < p < 1) with non-differentiable integral function is constructed. For some class of quasi-Banach spaces X it is proved that the set of all X-valued functions with zero derivative is dense in the space of all continuous functions, and for any two continuous functions x and y there is a sequence of differentiable functions which tends to x uniformly and for which the sequence of derivatives tends to y uniformly. There is also constructed a differentiable function x with $x'(t_0) = x_0$ for given $t_0$ and $x_0$ and x'(t) = 0 for $t ≠ t_0$.
Źródło:
Studia Mathematica; 1994, 110, 3; 205-220
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the optimal structure for territorial technogenic safety system
Autorzy:
Popov, V.
Chub, I.
Novozhylova, M.
Powiązania:
https://bibliotekanauki.pl/articles/411299.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
technogenic safety system
turbulence surrounding
technogenic hazards
stochastic discrete programming
Opis:
Turbulence surrounding of the development programs of territory technogenic safety systems impacts the implementation of the program. Thus, it raises the need to design constructive tools of mathematical modeling configured to the phases of the development program in order to increase the efficiency of applying limited human, financial material, time and other resources being involved to solve the problem of technogenic safety systems. We consider both a static optimization model of the technological safety system structure and dynamic one taking into account the state of fixed assets of potentially dangerous industrial object, composition and quantity of hazardous substances being applied and stored at some industrial object, other factors that determine the potential possibility of technogenic incident occurrence. As criteria of the problems one can use forms of known criteria that allow to assess the economic efficiency of different technological safety systems. The main constraints of static and dynamic optimization mathematical models have been proposed and analyzed. In common the problems being considered are stochastic discrete (discrete-continuous) problems of multi-criteria optimization, and their decision is based on the implementation of the branch and bound approach. The approach allows organizing iterative algorithm to identify desired parameters of TTSS development program product.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 3; 79-84
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection from layered dielectric structures with combined regular and random inhomogeneities
Autorzy:
Guzev, M.A.
Popov, G.V.
Powiązania:
https://bibliotekanauki.pl/articles/308755.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
optical waveguides
layered structures
Opis:
Optical wave reflection from a layered half-space with regular and random inhomogeneities where the regular perturbations correspond to a linear waveguide near the half-space boundary. Random inhomogeneities are simulated in the frame of the white noise model. The problem is solved analytically in a framework of the embedding method which reduces a boundary problem to the problem with initial values considering the field as a function of the half-space boundary coordinate and obtaining then its solution as a steady-state probability density of the reflection coefficient phase. Numerical calculations revealed some features of the field behaviour under the combined influence of regular and random inhomogeneities such as the reflection coefficient phase increasing inhomogeneity from uniform distribution for small regular inhomogeneities toward a strong peak at the phase equal to pi/2 for increasing ones, and some fine effects which are still greater then the calculation accuracy.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 1-2; 80-82
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First report on the occurrence of Neseuretinus and Ovalocephalus trilobites in the Middle Ordovician of Iran
Autorzy:
Ghobadi, Pour M
Popov, L.E.
Powiązania:
https://bibliotekanauki.pl/articles/21343.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
trilobite
taxonomy
Trilobita
paleontology
Shirgesht Formation
Ovalocephalus
Neseuretinus
Ordovician
paleobiogeography
Middle Ordovician
Iran
Opis:
In the Derenjal Mountains of east Central Iran, the upper part of the Shirgesht Formation (uppermost Darriwilian) contains a distinct trilobite assemblage that includes Neseuretinus birmanicus and Ovalocephalus aff. obsoletus among others. Both genera were previously unknown in Iran. The occurrence of Ovalocephalus represents the earliest sign of westward taxon migration from China towards higher latitudes along the West Gondwanan margin, which may be related to global warming, after a short episode of cooler climate in the early to mid Darriwilian. Patterns of biogeographical distribution of Ovalocephalus and Neseuretinussuggest that Central Iran was part of an “overlap zone” where tropical and high latitude benthic taxa mingled.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 1; 125-133
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Ordovician palaeogeography and the positions of the Kazakh terranes through analysis of their brachiopod faunas
Autorzy:
Popov, L. E.
Cocks, L. R. M.
Powiązania:
https://bibliotekanauki.pl/articles/138779.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Sandbian
katian
brachiopods
Kazakhstan
palaeogeography
Central Asian Orogenic Belt
sandb
kat
ramienionogi
Kazachstan
paleogeografia
Azja Środkowa
Opis:
Detailed biogeographical and biofacies analyses of the Late Ordovician brachiopod faunas with 160 genera, grouped into 94 faunas from individual lithotectonic units within the Kazakh Orogen strongly support an archipelago model for that time in that area. The Kazakh island arcs and microcontinents within several separate clusters were located in the tropics on both sides of the Equator. Key units, from which the Late Ordovician faunas are now well known, include the Boshchekul, Chingiz-Tarbagatai, and Chu-Ili terranes. The development of brachiopod biogeography within the nearly ten million year time span of the Late Ordovician from about 458 to 443 Ma (Sandbian, Katian, and Hirnantian), is supported by much new data, including our revised identifications from the Kazakh Orogen and elsewhere. The Kazakh archipelago was west of the Australasian segment of the Gondwana Supercontinent, and relatively near the Tarim, South China and North China continents, apart from the Atashu-Zhamshi Microcontinent, which probably occupied a relatively isolated position on the south-western margin of the archipelago. Distinct faunal signatures indicate that the Kazakh terranes were far away from Baltica and Siberia throughout the Ordovician. Although some earlier terranes had joined each other before the Middle Ordovician, the amalgamation of Kazakh terranes into the single continent of Kazakhstania by the end of the Ordovician is very unlikely. The Late Ordovician brachiopods from the other continents are also compared with the Kazakh faunas and global provincialisation statistically determined.
Źródło:
Acta Geologica Polonica; 2017, 67, 3; 323-380
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technological standardization
Tekhnologicheskaja standartizacija
Autorzy:
Kirichenko, I.
Morneva, M.
Kashura, A.
Popov, S.
Powiązania:
https://bibliotekanauki.pl/articles/792013.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
standardization
technological cycle
production
interchangeability
typification
conformity assessment
effectiveness
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2015, 15, 3
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of rolling friction with sliding
Modelirovanie processa trenija kachenija so skolzheniem
Autorzy:
Kirichenko, I.
Kashura, A.
Morneva, M.
Popov, S.
Powiązania:
https://bibliotekanauki.pl/articles/792332.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
friction force
adhesion
rolling friction
contact area
sliding friction
wheel
locomotive
thrust
mathematical model
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 2
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Ordovician brachiopods from the Selety River basin, North Central Kazakhstan
Autorzy:
Nikitin, I F
Popov, L.E.
Bassett, M.G.
Powiązania:
https://bibliotekanauki.pl/articles/22739.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
brachiopod
Ordovician
Late Ordovician
biogeography
Selety River
taxonomy
Kazakhstan
Brachiopoda
paleontology
Opis:
A medium−diversity fauna of late Ordovician rhynchonelliformean brachiopods occurs in the Tauken Formation (upper Caradoc–lowermost Ashgill) of north Central Kazakhstan.It demonstrates close similarity to the approximately contemporaneous faunas characteristic of shallow clastic shelves (BA 2–3) of the Chingiz and Chu−Ili ranges (both in Kazakhstan) and South China, but is characterized by a high proportion of endemic new species, including Tetraphalerella bestiubensis sp.nov., Glyptomena kaskolica sp.nov., Dinorthis taukensis sp.nov., Rhynchotrema seletensis sp.nov., and Nalivkinia (Pronalivkinia)zvontsovisp.nov.The abundance of Rhynchotrema is somewhat unusual by comparison with faunas from other Kazakhstanian terranes, where rhynchonellides of the family Ancistrorhynchidae are usually dominant in near−shore biofacies.The occurrence of the atrypides Sulcatospira and early Nalivkinia demonstrates a clear biogeographical linkage with approximately contemporaneous faunas of South China.
Źródło:
Acta Palaeontologica Polonica; 2003, 48, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oligocene bivalve faunas from the Silesian Nappe, Polish Outer Carpathians: Evidence for the early history of the Paratethys
Autorzy:
Studencka, B.
Popov, S.
Bieńkowska-Wasiluk, M.
Wasiluk, R.
Powiązania:
https://bibliotekanauki.pl/articles/2059857.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Bivalvia
Menilite Beds
Carpathian
Rupelian
Solenovian
Paratethys
Opis:
The study is focused on the taxonomic inventory of an intriguing bivalve fauna from the Lower Oligocene Menilite Beds (Dynów Marls) within the Silesian Nappe, Polish Outer Carpathians. Sixteen bivalve species have been identified within the material collected in two small quarries in Jabłonica Polska near Krosno. Stratigraphic and geographic distributions of all recognized species are considered. This assemblage, the first of this kind in Poland and one of three recognized in the Outer Carpathians, shows clear affinities to coeval typical Solenovian faunas from Ukraine to Kazakhstan, with particular comparison made to bivalve faunas from the Menilite Formation (Subchert Member) within the Boryslav-Pokuttya Nappe, Ukrainian Outer Carpathians. Moreover, this study presents an overview of the main aspects and definitions of the date of the Paratethys origin. The main criterion used to define the time of the Paratethys birth is the distinct faunal turnover from the moderately diverse boreal or Tethyan bivalve faunas populating particular basins of the Northern Peri-Tethys in the earliest Oligocene to the uniform, highly endemic fauna inhabiting the newly formed semi-closed basin. This vast inland sea, named Paratethys, was populated by representatives of eight euryhaline bivalve families. They are characterized by extinct Paratethyan genera, such as Bessia Kojumdgieva et Sapungieva, Merklinicardium Popov, Korobkoviella Merklin, Urbnisia Goncharova, Ergenica G. Popov and Janschinella Merklin.
Źródło:
Geological Quarterly; 2016, 60, 2; 317--340
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ordovician ostracods from East Central Iran
Autorzy:
Ghobadi Pour, M.
Williams, M.
Vannier, J.
Meidla, T.
Popov, L.E.
Powiązania:
https://bibliotekanauki.pl/articles/22059.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
geographic setting
Iran
Ordovician
Ostracoda
Shirgesht Formation
brachiopod
geological setting
ostracod
paleontology
trilobite
systematics
ostracod fauna
biogeography
stratigraphy
Opis:
Ordovician ostracods are described for the first time from Iran, enhancing the record of this group from the Lower Palaeozoic of the Middle East. The ostracods occur in the Shirgesht Formation, in the east central part of the country, and comprise Ogmoopsis achaemenid sp. nov., Cerninella aryana sp. nov., Ordovizona amyitisae sp. nov., cf. Aechmina? ventadorni, Vogdesella sp., and podocope taxa tentatively identified as species of Longiscula, Pullvillites, and Rectella. These taxa were hitherto unknown from this region. The ostracod−bearing interval is associated with trilobites (Neseuretinus) and brachiopods (Nicolella) that suggest a late Middle Ordovician age. Although the ostracod fauna is small, it demonstrates biogeographical links at genus−level, and possibly at species−level, with the fauna of the late Middle Ordovician Travesout Formation of western France, which also lay in a peri−Gondwanan palaeogeographical setting. It also suggests the potential use of some ostracods as stratigraphical tools for correlating Ordovician rock successions between Europe and the Middle East.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new, unusual rhynchonellide brachiopod with a strophic shell from the Sirurian of Iran
Autorzy:
Popov, L.E.
Hairapetian, V.
Pour, M.G.
Modzalevskaya, T.L.
Powiązania:
https://bibliotekanauki.pl/articles/20883.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
A new, unusual rhynchonellide brachiopod Jafarirhynchus alatus assigned to the newly established family Jafarirhynchidae is described from the Silurian (Telychian) of the Boghu Mountains in east-central Iran. It forms a low diversity association with the spiriferide Striispirifer? ocissimus, which exhibits well preserved calcified brachial supports. A strophic shell, well-developed ventral interarea and liberosessile mode of life make this taxon unique among Palaeozoic rhynchonellide brachiopods. In spite of a superficial similarity to spiriferides and the atrypide family Davidsonioidea, Jafarirhynchus retains the typical rhynchotrematoid cardinalia with a septalium supported by the median septum, a septiform cardinal process and long, raduliform crura. It is considered as an offshoot of the local lineage, which includes two successive species of Stegocornu (family Rhynchotrematidae) which proliferated in Central Iran and adjacent Afghanistan during Aeronian time.
Źródło:
Acta Palaeontologica Polonica; 2015, 60, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological properties of multilayered vacuum coating
Autorzy:
Rogachou, A.
Popov, A.
Piliptsov, D.
Yarmolenko, M.
Rogachev, A.
Fedosenko, N.
Powiązania:
https://bibliotekanauki.pl/articles/385181.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
diamond-like coatings
polytetrafluoroethylene
polyurethane
friction
Opis:
The results of studies show the deposition conditions of the titanium-nitride based coatings and their structure influence on the tribological characteristics of the dry friction and in the diesel fuel. Tribological characteristics of multilayered systems on the basis of diamond-like coatings (DLC) have been studied. The deposition of the systems onto small-size cutting tools is found efficient for improving their service characteristics. When depositing the coatings to the cutting tool surface the microrelief of edges is not distorted and the service life increases 1.3 - 1.5 times. The morphology and tribological behaviour of composite and multi-layer polymer coatings based on polytetrafluoroethylene (PTFE) and polyurethane (PU) are studied after deposition by means the method of electron beam dispersion. It is shown possibility to produce fine-film systems based on polyurethane with polytetrafluoroethylene as filler that possess high tribological performance.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 115-117
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impedance Spectra of As-Grown and Heat Treated $Na_{0.5}Bi_{0.5}TiO_3$ Crystals
Autorzy:
Kruzina, T.
Sidak, V.
Trubitsyn, M.
Popov, S.
Tuluk, A.
Suchanicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398237.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.-s
43.58.Bh
72.80.Rj
Opis:
The complex impedance spectra Z*(ω) were studied for as-grown and annealed in air $Na_{0.5}Bi_{0.5}TiO_3$ single crystals. Experimental data showed that annealing significantly increased impedance and led to appearance of low frequency Z* relaxation. The detected relaxation processes were associated with charge transfer within the regions with initial and reduced after annealing concentration of oxygen vacancies.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 816-818
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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