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Wyświetlanie 1-15 z 2272
Tytuł:
Adaptive control scheme based on the least squares support vector machine network
Autorzy:
Mahmoud, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/930155.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
modelowanie systemu
system nieliniowy
system sterowania
sieć neuronowa
maszyna wektorów wspierających
support vector machine (SVM)
neural network
nonlinear system modeling
nonlinear system control
pH control
Opis:
Recently, a new type of neural networks called Least Squares Support Vector Machines (LS-SVMs) has been receiving increasing attention in nonlinear system identification and control due to its generalization performance. This paper develops a stable adaptive control scheme using the LS-SVM network. The developed control scheme includes two parts: the identification part that uses a modified structure of LS-SVM neural networks called the multi-resolution wavelet least squares support vector machine network (MRWLS-SVM) as a predictor model, and the controller part that is developed to track a reference trajectory. By means of the Lyapunov stability criterion, stability analysis for the tracking errors is performed. Finally, simulation studies are performed to demonstrate the capability of the developed approach in controlling a pH process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 4; 685-696
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Criticality Due to the Topological Effects in the Hubbard Model
Autorzy:
Kopeć, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/2047311.pdf
Data publikacji:
2007-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.Fg
71.10.Pm
Opis:
We argue that in a strongly correlated electron system collective instanton excitations of the phase field (dual to the charge) arise with a great degree of stability, governed by gauge flux changes by an integer multiple of 2π. By unraveling consequences of the nontrivial topology of the charge gauge U(2) group, we found that the pinning of the chemical potential and the zero-temperature divergence of charge compressibility define a novel "hidden" quantum criticality on verge of the Mott transition governed by the protectorate of stable topological numbers rather than the Landau paradigm of the symmetry breaking.
Źródło:
Acta Physica Polonica A; 2007, 111, 4; 527-536
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-snail infestation of Devonian crinoids and the nature of platyceratid-crinoid interactions
Autorzy:
Baumiller, T K
Powiązania:
https://bibliotekanauki.pl/articles/20265.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
USA
Silica Formation
Devonian
platyceratid-crinoid interaction
biotic interaction
crinoid
snail
Middle Devonian
paleontology
Ohio
Opis:
The well−known association of platyceratid snails and crinoids typically involves a single snail positioned on the tegmen of the crinoid host; this has led to the inference of coprophagy. Two specimens of the camerate crinoid Arthroacantha from the Middle Devonian Silica Formation of Ohio, USA, exhibit numerous snails on their tegmens. On one of these, 6 platyceratid juveniles of approximately equal size are found on the tegmen. On the second crinoid, the largest of 7 infesting platyceratids occupies the typical position over the anal vent while others are either superposed (tiered) upon it or are positioned elsewhere on the tegmen. These specimens illustrate that platyceratids (1) settled on crinoids as spat, (2) were not strictly coprophagous during life yet (3) benefited from a position over the anal vent.
Źródło:
Acta Palaeontologica Polonica; 2002, 47, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molluscan fauna of abandoned crystalline limestone quarry in Rogozka (Lower Silesia, Krowiarki Range, Stronie Slaskie commune)
Autorzy:
Maltz, T.K.
Powiązania:
https://bibliotekanauki.pl/articles/83188.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
mollusc
fauna
abandoned quarry
crystalline limestone
Rogozka village
Lower Silesian region
Krowiarki Mountains
Stronie Slaskie commune
Snieznik Massif
endangered species
ecology
succession
Calusilia parvula
Helicigona lapicida
malacofauna
quarry
Opis:
The paper deals with succession in an abandoned quarry of crystalline limestone, located in the village of Rogóżka (Krowiarki Mts near Konradów, the northern extension of the Śnieżnik Massif). Its bottom is covered by synanthropic communities of unspecified systematic rank and communities of limestone screes as well as clumps of Alnus incana and Betula sp. The following communities, gradually entering the quarry, have been distinguished: Dentario-Fagetum, Aceri-Tilietum and Carici remotae-Fraxinetum. The malacofauna collected in the quarry (45 species) constitutes 50.6% of the terrestrial snails recorded from the OEnieżnik Massif (89 species) and 43.7% of those collected in the Kłodzko Region (103 species). Seven of the 15 clausiliid species recorded from the Kłodzko Region were found in the quarry (47%), which indicates considerable diversity of the microhabitats. The most important species include Eucobresia diaphana, Semilimax semilimax, Macrogastra tumida, Helicigona lapicida, and most of all Clausilia parvula; for the last species the quarry in Rogóżka is the only extant locality in the Kłodzko Region. The fate of the quarry’s malacofauna is uncertain, since formally it has not been exluded from exploitation; measures need be taken to establish a nature reserve there.
Źródło:
Folia Malacologica; 2011, 19, 3
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Helicodonta obvoluta (O.F. Muller, 1774) (Gastropoda: Pulmonata: Helicidae) - up-dated distribution in Poland, threats and conservation status
Autorzy:
Maltz, T.K.
Powiązania:
https://bibliotekanauki.pl/articles/84059.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
H. obvoluta is endangered within its whole distribution range. It is a C. European species, distributed from the Pyrennees and the Atlantic coast of France to southern Slovakia and northern Hungary; it occurs also in Great Britain, Schleswig-Holstein, southern part of Moravy, Albania, Bosnia, northern Serbia and in Italy. In Poland it has few localities in the central Sudetes. It is a typical forest-dweller of montane areas, associated with dead timber which is necessary for its reproduction, feeding and hibernation. Its presence in ten sites in Poland has been confirmed. The main threats for the species are clear-felling and removal of dead timber.
Źródło:
Folia Malacologica; 2003, 11, 1-2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Life cycle of Helicodonta obvoluta
Autorzy:
Maltz, T.K.
Powiązania:
https://bibliotekanauki.pl/articles/83099.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
life cycle
Helicodonta obvoluta
species distribution
reproductive period
egg
animal reproduction
shell size
snail
Źródło:
Folia Malacologica; 1999, 07, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Life cycle and population dynamics of Helicodonta obvoluta (O.F.Muller, 1774) (Gastropoda: Pulmonata: Helicidae)
Autorzy:
Maltz, T.K.
Powiązania:
https://bibliotekanauki.pl/articles/83552.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Lifecycleof Helicodonta obvoluta (O. F. Müll.) was studied in the field and in laboratory. Mating lasts 2–3 hrs and includes: meeting of the partners, recognition, courtship dance, copulation, resting phase and parting. No spermatophores were observed upon dissection of a total of 90 adult individuals which seems to indicatethat H. obvoluta does not produce them. The egg-laying snail embeds anterior part of its body 4–6 mm deep in rotting timber. The egg-laying lasts from about a dozen hours to two days. Freshly laid eggs are white, calcified, slightly translucent and get opaque in a few days. They are slightly oval, of 2.10–2.85 mm major and 2.00–2.60 mm minor diameter. In laboratory, eggs are laid in spring (March-June) and autumn (August-November), in the field, the egg-laying periods are somewhat shorter (April-beginning of June, end of August-beginning of October). Most laboratory snails laid eggs only once in their lifetime, the maximum number of egglaying periods was four. The percentage of hatching eggs in laboratory is ca. 59%. The number of eggs per clutch ranges from 9 to 27. The incubation period ranges from 14 to 31 days, and is shorter for spring (14–18 days) compared to autumn (19–23 days) clutches. Hatching is asynchronous, lasting from 1 to 4 days. With approaching hatching, thewhitecolour of thee gg disappears, so that theyoung snail is surrounded only by a translucent membrane, which gets broken as a result of its movements. Newly-hatched snails have shells of 1 whorl, devoid of periostracal hairs. No egg cannibalism was observed. Out of 174 young hatched in laboratory, 159 reached maturity. During numerous dissections of adult individuals no eggs were found in the reproductive tracts; if there is an egg-retention, it must be very short-lasting. Placing eggs in rotting timber and covering them with mucus protects them from drying-out, ensures a more favourable temperature and limits accessibility to predators. The number, relative and absolute size of eggs, number of clutches per year and per lifetime, and the life span seem to be correlated with size rather than with phylogenetic position of the species. No uniparental reproduction was observed. In laboratory the time elapsing between hatching and maturity (lip completely formed) ranged from 140 to 624 days; it varied between individuals hatched in particular years and seasons, e.g. young of the spring 1997 grew much faster (mean 354 days) than those of the spring 1999 (mean 442 days). The time required to reach full size was not correlated with the ultimate number of whorls. The growth shows three distinct phases: a quick initial phase of 3–4 months, a slow phase, and a short quick phase preceding lip formation. The monthly increment depends on the growth phase: 1.15 whorl in phases 1 and 3, 0.30 whorl in phase2. Thegrowth ratein thefie ld is similar to that observed in laboratory, though with a wider scatter within growth phases and some differences between years and seasons. Depending on weather conditions, theyounge st ageclass (1) appears from April till Juneor from May till July, and from thee nd of August till the beginning of October. Thus each season two new generations are produced: spring and autumn. The spring generation, depending on the month of hatching, may complete its growth in the same season and winter as adults, or reach stage 4 or 5 and complete their growth next spring. The autumn generation always winters as immature snails which complete their growth in late spring next year. Adult snails (c. 1 year old) dominatein all themonthly samples, whileolde r individuals arefe w. In laboratory, thelifespan ranged from 516 to 1,187 days; thus thelifespan of someindividuals exceeds 3 years. Thee stimateof lifespan in the field, based on marking-release-recapture, is less exact, but on the whole the oldest snails in the field lived slightly over 3 years, whilelifespan of somewas only 2 years. In laboratory and in thefie ld, thesnails reproducein spring and autumn. In laboratory, they areactive(fe eding, crawling) throughout theye ar, but in winter resting periods of a few days at a time are observed, with the aperture covered by a thin epiphragm. In the field, the snails enter winter torpor at the end of October/beginning of November, having penetrated rotting logs from below, and stay in rotting wood with their apertures covered with thick, calcified epiphragms. Depending on weather, they get active at the beginning or end of April. Under conditions of constant temperature and humidity (indoors) adult snails show two activity peaks: late evening and early morning, with a resting period during theday . Immatureindividuals aremoreactive , with a constant high activity sinceafte rnoon till mid-morning, and most remain activeduring theday . In conditions of variablete mperatureand humidity (out- oors), the activity of all age classes depends on humidity and temperature, the immature snails, like in constant conditions, being generally more active. The mobility of H. obvoluta is rather high, individual snails cover the distance of 4–5 or even 7 metres during a month.
Źródło:
Folia Malacologica; 2003, 11, 3-4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reproductive system development and annual cycle of gonad activity in Helicodonta obvoluta (O.F.Muller, 1774) (Gastropoda: Pulmonata: Helicidae s. Lat.)
Autorzy:
Maltz, T.K.
Powiązania:
https://bibliotekanauki.pl/articles/84228.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
The reproductive system structure in H. obvoluta follows the helicid pattern except for the dart sac which is absent. In juvenile snails the gonad is the first to develop; the later development of male and female reproductive organs is synchronous. At the stage of lip formation the reproductive system is fully developed. At an initial stage of the gonad development (3 and 4 whorls) mitotically dividing cells prevail, and the first pools of oocytes and spermatocytes in meiotic prophase appear. At the stage of 5 whorls the number of mitoses decreases, while the number of cells in meiotic prophase increases considerably, resulting in an increase in the gonad volume. The first growing oocytes appear, while spermatids and mature spermatozoa are absent. The gonad in lip-building snails contains all the cells characteristic of mature hermaphroditic gland. In mature gonad oocytes and spermatozoa are present throughout the year. The number and size of oocytes vary seasonally. Large vitellogenic oocytes are present from April till the beginning of July and from the end of August till October. The pool of growing oocytes appears in August and in November-December. The intensity of divisions leading to formation of the respective gametes changes in a similar way. The development of female lineage cells seems to determine the timing of reproduction, since spermatozoa are present throughout the year.
Źródło:
Folia Malacologica; 2003, 11, 1-2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shell variation in Helicodonta obvoluta (O.F. Muller, 1774) (Gastropoda: pulmonata: Helicidae s. lato)
Autorzy:
Maltz, T.K.
Powiązania:
https://bibliotekanauki.pl/articles/84542.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Biometrical analysis of the material of 668 adult shells of Helicidonta obvoluta (Müll.) from Great Britain, Spain, Italy, Switzerland, Germany, Poland, the Czech Republic, Slovakia and Hungary showed a high inter-population variation. Similarity analysis revealed two clusters of populations: one from the centre of the range, another inhabiting its fringes. Snails from the Abruzzi Mts (Central Apennines) had shells similar to those from the central populations, though the area is located on the southern fringe of the distribution range.
Źródło:
Folia Malacologica; 2007, 15, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological Criticality on Brink of the Mott Transition in High-T$\text{}_{c}$ Superconductors
Autorzy:
Kopeć, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/2046733.pdf
Data publikacji:
2006-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.-z
74.20.Fg
71.10.Pm
Opis:
The concept of topological excitations and the related ground state degeneracy are employed to establish an effective theory of the superconducting state evolving from the Mott insulator for high-T$\text{}_{c}$ cuprates. The theory includes the effects of the relevant energy scales with the emphasis on the Coulomb interaction $U$ governed by the electromagnetic U(1) compact group. The results are obtained for the layered t-t'-t$\text{}_{⊥}$-U-J system of strongly correlated electrons relevant for cuprates. Casting the Coulomb interaction in terms of composite-fermions via the gauge flux attachment facility, we show that instanton events in the Matsubara "imaginary time", labelled by a topological winding numbers, governed by gauge flux changes by an integer multiple of 2π, are essential configurations of the phase field dual to the charge. The impact of these topological excitations is calculated for the phase diagram, which displays the "hidden" quantum critical point on verge of the Mott transition that is given by a divergence of the charge compressibility.
Źródło:
Acta Physica Polonica A; 2006, 109, 4-5; 499-506
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of economic efficiency related to the production of winter triticale in farms which use different variants of fertilization
Porównanie efektywności ekonomicznej produkcji pszenżyta ozimego w gospodarstwach stosujących różne warianty nawożenia
Autorzy:
Kołosowski, P.
Dobek, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/337165.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
pig slurry
winter triticale
economic efficiency
gnojowica świńska
pszenżyto ozime
efektywność ekonomiczna
Opis:
The intensification of livestock production in our country, forces farmers to search for optimum manners to manage byproducts such as slurry or manure. The traditional manner consists in their use as fertilizer. Although such an approach has obvious advantages, well known for many years, it involves an increase in operating costs, which may outweigh the profitability of the use of natural fertilizers. Based on the results of the economic analysis related to the production of winter triticale, in two neighbouring farms, an increase in production costs of winter triticale was found out, arising from the application of slurry. However, the farm using slurry, owing to higher crop, achieved more profit and in consequence featured a factor of economic efficiency on average higher by 0.1.
Intensyfikacja produkcji zwierzęcej w naszym kraju, zmusza producentów rolnych do poszukiwania optymalnych sposobów zagospodarowania powstających produktów ubocznych takich jak: gnojowica czy obornik. Tradycyjnym sposobem ich wykorzystania jest wykorzystanie nawozowe. Pomimo niewątpliwych, znanych od wielu lat zalet takiego podejścia, wiąże się to ze wzrostem kosztów eksploatacyjnych, które mogą zaważyć na opłacalności stosowania nawozów naturalnych. Na podstawie wyników analizy ekonomicznej produkcji pszenżyta ozimego, w dwóch sąsiadujących ze sobą gospodarstwach stwierdzono wzrost kosztów produkcji pszenżyta ozimego na skutek stosowania nawożenia gnojowicą. Jednak gospodarstwo stosujące gnojowicę dzięki wyższym uzyskiwanym plonom osiągało większy zysk, a w konsekwencji cechowało się wyższym średnio o 0,1 współczynnikiem efektywności ekonomicznej.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2016, 61, 3; 233-235
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the influence of atmospheric intensity on the wooden façade of the building by visualization method
Autorzy:
Pluta, M.
Thiis, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/100246.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
3D visualization
3D modeling
data integration
animation
wizualizacja 3D
modelowanie 3D
animacja
Opis:
3D visualization is one of the forms of presentation of spatial phenomena, which, thanks to the development of new technologies of acquiring, modeling and providing spatial information, is one of the most popular methods of presenting real objects in the virtual world. Practice shows that 3D visualization is increasingly being used by different entities to present research results in 3D form, thereby ensuring better readability of the papers. The paper describes the methodology of 3D visualization of the influence of atmospheric conditions on wooden facades of a school building. Methods of obtaining data for the purpose of creating a 3D model of a research object, processing vector and raster data, and rendering the final animation were described. The results of the study show that the use of 3D visualization as a form of presenting research results enables accurate estimation of the intensity of atmospheric conditions on the vertical elevation, taking into account the exact geometry of the research object.
Źródło:
Geomatics, Landmanagement and Landscape; 2017, 2; 115-121
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification and segmentation of periodontal cystfor digital dental diagnosis using deep learning
Autorzy:
Lakshmi, T. K.
Dheeba, J.
Powiązania:
https://bibliotekanauki.pl/articles/38700996.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
CNN
dental radiograph
deep learning
health care
machine transfer learning
periodontal cyst
predictive analytics
segmentation
U-Net
VGG16
rentgenowskie zdjęcie zębów
uczenie głębokie
opieka zdrowotna
uczenie się z transferu maszynowego
torbiel przyzębia
analityka predykcyjna
segmentacja
Opis:
The digital revolution is changing every aspect of life by simulating the ways humansthink, learn and make decisions. Dentistry is one of the major fields where subsets ofartificial intelligence are extensively used for disease predictions. Periodontitis, the mostprevalent oral disease, is the main focus of this study. We propose methods for classifyingand segmenting periodontal cysts on dental radiographs using CNN, VGG16, and U-Net.Accuracy of 77.78% is obtained using CNN, and enhanced accuracy of 98.48% is obtainedthrough transfer learning with VGG16. The U-Net model also gives encouraging results.This study presents promising results, and in the future, the work can be extended withother pre-trained models and compared. Researchers working in this field can develop novelmethods and approaches to support dental practitioners and periodontists in decision-making and diagnosis and use artificial intelligence to bridge the gap between humansand machines.
Źródło:
Computer Assisted Methods in Engineering and Science; 2023, 30, 2; 131-149
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the production costs of winter rape seeds on the value of the produced biodiesel
Wpływ kosztów produkcji nasion rzepaku ozimego na wartość wyprodukowanego biodiesla
Autorzy:
Dobek, T. K.
Sałagan, P.
Powiązania:
https://bibliotekanauki.pl/articles/288699.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
biodiesel
efektywność ekonomiczna
gliceryna
koszt produkcji
makuch rzepakowy
rzepak ozimy
economic efficiency
glycerine
production cost
rape cake
winter rape
Opis:
The article presents an analysis and economic evaluation of the production technology of winter rape and processing of the obtained seeds into biofuel. The experiments were conducted on farms, which use different technologies of field preparation for sowing. Economic efficiency of biodiesel from winter rape was calculated with consideration of the rape seed production costs and its processing into biodiesel. The conducted experiments prove that the production of biodiesel may be profitable if not only biofuel is sold but also straw, rape cake and glycerine.
W artykule przedstawiono analizę i ocenę ekonomiczną technologii produkcji rzepaku ozimego oraz przetworzenia uzyskanych nasion na biopaliwo. Badania przeprowadzono w gospodarstwach stosujących różne technologie przygotowania roli do siewu. Obliczono efektywność ekonomiczną biodiesla z rzepaku ozimego z uwzględnieniem kosztów produkcji nasion rzepaku oraz przetworzenia na biodiesel. Z przeprowadzonych badań wynika, że produkcja biodiesla może być opłacalna pod warunkiem sprzedaży nie tylko biopaliwa, ale także słomy, makuchu rzepakowego, a także gliceryny.
Źródło:
Inżynieria Rolnicza; 2011, R. 15, nr 7, 7; 21-28
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 2272

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