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Tytuł:
Two bone fragments of ornithocheiroid pterosaurs from the Cenomanian of Volgograd region, Southern Russia
Autorzy:
Averianov, A O
Kurochkin, E.N.
Pervushov, E.M.
Ivanov, A.V.
Powiązania:
https://bibliotekanauki.pl/articles/21981.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Volgograd Region
Cenomanian
Cretaceous
Pterosauria
Russia
Ornithocheiroidea
bone fragment
ornithocheiroid pterosaur
pterosaur
paleontology
Opis:
Two pterosaur bone fragments, a distal humerus and a distal femur, from the upper Cenomanian of the Volgograd Region in the Don River basin of southern Russia are reported. Although fragmentary, these bones come from mature individuals and are exceptionally well and three−dimensionally preserved, allowing a detailed description of their anatomy. Both specimens can be referred to a middle−sized ornithocheiroid pterosaur with a reconstructed wingspan of about 4 m. The humerus shows affinities with Istiodactylus from the Barremian of England, whereas the femur fragment is not identifiable beyond Ornithocheiroidea indet.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
H2O2 production in chloroplasts, its outward diffusion through aquaporins, and the effects of light intensity
Autorzy:
Borisova-Mubarakshina, M.
Kozuleva, M.
Rudenko, N.
Vetoshkina, D.
Naydov, I.
Ivanov, B.
Powiązania:
https://bibliotekanauki.pl/articles/81009.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
hydrogen peroxide
superoxide radical
chloroplast
diffusion
thylakoid
reactive oxygen species
aquaporin
light intensity
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of fractal analysis and phase trajectories for the improvement of identification of complex technical systems
Autorzy:
Chovnyuk, Y. V.
Gumenyuk, Y. O.
Djachenko, L. A.
Ivanov, E. A.
Kravchyuk, V. T.
Powiązania:
https://bibliotekanauki.pl/articles/114794.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
fractal analysis
improvement
methods
phase trajectories
qualitative analysis
analiza fraktalna
trajektoria fazowa
analiza jakościowa
Opis:
The procedure of the qualitative analysis of complex technical systems is discussed. One may use such methods of analysis for time series characterized the functioning of such systems. These time serious aren’t confirmed the hypothesis of trend existence. One may use at this qualitative analysis the methods of nonlinear dynamics and the theory of chaos. The basis for similar researches is Takens’s theorem. The randomness of the studied dynamical system as the model of the complex technical system given by time realizations is established by means of Lyapunov’s indicator. The state stability is estimated by Hausdorf’s fractal dimension and the fractality index. Visual evaluation of the time series was carried out by means of the phase trajectory restoration procedure. As a result of the analysis of the phase points in the phase space the split attractor is indicated, which gives the chance to speak about its bifurcation.
Źródło:
Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 41-50
2544-2813
Pojawia się w:
Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the current state of EHF-sensors quality in the technical systems and its improvement
Autorzy:
Chovnyuk, Y. V.
Ivanov, E. A.
Dovhaljuk, V. B.
Shyshyna, M. A.
Gumenjuk, Y. O.
Sivak, I. N.
Powiązania:
https://bibliotekanauki.pl/articles/114875.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
aperture
coaxial line
dynamic range of the evaluation
extremely high frequency sensors
function of the entropy evaluation
scale of the entropy evaluation
oceny entropii
czujnik
funkcja oceny entropii
Opis:
In the article the function and the scale for the entropy evaluation of the current state of extremely high frequency (EHF-) sensors quality in the various technical systems which fits the requirements of universality and maximal independency from the human factor are offered. One may see such EHF-sensors for the analysis of the quick transformations of the biological liquids properties. It’s high lighted that the available methods of the determination of technical systems’ quality have essential flaws which consist in both subjectivism because the dominant role in the evaluation belongs to experts and legitimacy of providing them properties of universality which was proved by nobody. The scheme of EHF-sensor is analyzed for which one may create an analytical model. The problem of the fields’ determination at the working region of such sensor is discussed. The presented scheme is possible to use for the mathematical model and just for that part of the problem which is devoted to the transformation of the properties of the object. The results of calculation of components of electromagnetic field at the working space of EHF-sensor are discussed. One may estimate the sizes of this space. The offered function of the quality evaluation, the parameter of which is the quantity of own information of the explored sensor, provides the declared universality approach according to the principles of the information theory. The conformity to all requirements for the functions of the evaluation of the quality: continuity, monotonic and smoothness over the whole range of definition regardless of the probability distribution function, which is measured by the random value EHF-sensor was proved. The proposed scale of the entropy evaluation of the quality fits to standard settings of the diagnostic of the technical systems and has three sub ranges which determine the state of the EHF-sensors: good state, up state, and down state. Unlike the existing psychophysical scales the offered scale has dynamic range of the evaluation so the limits of the sub ranges will automatically change depending on the regulatory and technical requirements for the state of the explored EHF-sensor. Such approach provides adaptation of the scale to specific requirements which gives a chance to evaluate the qualitative state of the object more reliably. The results of modeling of the qualitative state of the sensor are given. The possible practical application of the offered function and scale is usage in the systems of monitoring and diagnostic for determination of the current qualitative state of the explored technical system, as well.
Źródło:
Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 26-40
2544-2813
Pojawia się w:
Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The improvement of the rheological model for controlling the stress-strain state and humidity in the materials of museum pieces: zener thermodiffusion model for capillary-porous bodies
Autorzy:
Dovhaliuk, V. B.
Chovnyuk, Y. V.
Ivanov, E. A.
Shyshyna, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/114762.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
aftereffect
colloid capillary-porous bodies
deformations
heat and mass transfer
Ishlinskiy - Rzhanitsin generalized rheological model of the elastic-viscous body
Zener thermodiffusion rheological model
model reologiczny
model termodyfuzji Zenera
ciało kapilarno-porowate
transfer ciepła
transfer masy
Opis:
The drying and humidifying processes of capillary-porous (colloid) bodies occur during the production of various materials for the consumer goods industry, building materials, storage of museum pieces, etc. It is known that the main linkage forms of the moisture and colloid capillary-porous bodies (CCPBs), namely adsorption, capillary condensation and capillary linkage of the free moisture in the cavities of the above bodies, depend on the temperature and relative humidity of drying/humidifying agent. It means that the CCPBs behave in a peculiar way depending on the temperature and humidity fields. The problems of CCPBs drying (or humidifying) process include the issue of the heat and humidity transfer both in the middle of the body and in the boundary layer on the interface of phases “body (object of drying/humidifying process) – environment”. The drying/humidifying intensity is at its maximum when the possibilities of the heat and mass transfer in the boundary layer correspond to the possibilities of moisture and heat moving inside the object of drying/humidifying process. The properties of the CCPB as material possessing specific elastic-viscous properties are described within the framework of O.Y. Ishlinskiy - O.R. Rzhanitsin generalized elastic-viscous body theory. A comparative analysis of the above mentioned CCPB’s properties from the point of view of Zener thermodiffusion theory is conducted. The mechanism of moisture transferring from the CCPBs’ central layers (as object of drying/humidifying process) up to their surfaces is developed. The theoretical researches examined the drying/humidifying phenomena for both the entire volume of the CCPB and three structural directions. It is noted that drying/humidifying of CCPBs is a complicated heat and mass transfer process accompanied by mechanisms of molecular nature determining the kinetics of their running. It is shown that the appropriate equations’ solution of molecular-molar heat and moisture transfer under the appropriate boundary (limit) conditions allows to describe the fields, i.e. the distribution of transfer potentials (the temperature and moisture content in the CCPB as object of drying/humidifying) at any time of the appropriate process. The drying/humidifying curves (“drying/humidifying rate versus CCPB humidity”) and the temperature curves (“CCPB temperatures versus CCPB humidity”) reflect the nature of the drying/humidifying processes. In the framework of the proposed generalized rheological model of CCPB, the residual deformations of bodies for various load types (the time-varying stress applied to the CCPB) is estimated.
Źródło:
Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 51-71
2544-2813
Pojawia się w:
Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the pulse plasma stream
Autorzy:
Evtikhin, V. A.
Lyublinsky, I. E.
Vertkov, A. V.
Ivanov, L. I.
Ivanov, Y. P.
Krokhin, O. N.
Nikulin, V. Y.
Polukhin, S. N.
Safronova, T. V.
Tikhomirov, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/148327.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
interaction of plasma with matter
lithium capillary porous system
plasma dynamics
plasma focus
thermonuclear reactor
Opis:
In this report we present a first series of tests of the lithium Capillary Porous System (CPS). We suppose that such a system can be used as a first wall in a thermonuclear reactor. The main goal of the presented work was to study the behavior of the lithium CPS in the condition simulating the influence of plasma in various operating regimes of the thermonuclear reactor. The tests were conducted in a Plasma Focus (PF) installation. The preliminary analysis of the received results confirms the high resistance of the lithium CPS to the pulse influence of plasma flows.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 113-115
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The revision of 'Cladodus' occidentalis, a Late Paleozoic ctenacanthiform shark
Autorzy:
Ginter, M
Ivanov, A.
Lebedev, O.
Powiązania:
https://bibliotekanauki.pl/articles/20599.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Carboniferous
Cladodus mirabilis
Paleozoic
Late Paleozoic
Permian
tooth
Ctenacanthiformes
Glikmanius occidentalis
paleontology
Chondrichthyes
Opis:
The teeth of a well known late Palaeozoic cladodont chondrichthyan, “Cladodus” occidentalis from Russia, USA, and England are restudied and a new generic name, Glikmanius gen. nov., is proposed for this species. Yet another tooth−based species, formerly described as ?Symmorium myachkovensis, occurring on the Russian Platform and in Nebraska, is considered to belong to the newly erected genus. Although there is no direct evidence that Glikmanius possessed fin spines, the broad similarity between its teeth and those of Ctenacanthus compressus suggests it had a ctenacanthiform affinity. The possible relationships between Glikmanius, Cladodus sensu stricto, “Ctenacanthus” costellatus, and Heslerodus, are suggested. However, the proposition put forward by an earlier author that the teeth of Heslerodus might represent the lower jaw dentition of G. myachkovensis, is rejected. The overall resemblance of Glikmanius teeth and those of Cladoselache and Squatinactis is recognised as convergent.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W krzywym zwierciadle. Gatunek. Idea. Teatr. (Kilka uwag o sztuce N.N. Wentzla Przedstawienie o panu Iwanowie)
In the Crooked Mirror. Genre. Idea. Theatre (A few Observations about N. N. Wenzel’s Play „The Story of Mr Ivanov”)
Autorzy:
Gracla, Jadwiga
Powiązania:
https://bibliotekanauki.pl/articles/1933404.pdf
Data publikacji:
2011
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
sztuka
moralitet
gatunek
stara komedia
krzywe zwierciadło
play
morality play
genre
old comedy
crooked mirror
Opis:
The present text attempts to analyse the play of an obscure, early 20th century playwright, Wenzel. The play in focus is „The story of Mr Ivanov”. The author of the paper tries to show the links between Wenzel’s text and the plays of his conteporaries and to indicate where exactly the satire is aimed. For, in Wenzel’s text one can find the playwright’s debate with Blok, Andriejev, Sologub and Hofmansthal. Wenzel’s work also, in a certain way, takes up a debate with the morality play which was used by the early 20th century writers. All the above observations authorize us to conclude that Wenzel remains perfectly in tune with the principle which governed the old comedy, the crooked mirror of a tragedy parodying all literary devices of the tragedy.
Źródło:
Roczniki Humanistyczne; 2011, 59, 7; 53-60
0035-7707
Pojawia się w:
Roczniki Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical properties of maize seeds
Autorzy:
Hernandez, A.
Cruz, O.
Ivanov, R.
Dominguez, P.
Carballo, C.
Moreno, I.
Powiązania:
https://bibliotekanauki.pl/articles/25661.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
maize
optical absorption coefficient
photoacoustic spectroscopy
absorption coefficient
seed
optical property
raw material
Źródło:
International Agrophysics; 2011, 25, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comments on the Late Devonian placoderms from the Holy Cross Mountains [ Poland ]
Uwagi o poznodewonskich plakodermach z Gor Swietokrzyskich
Autorzy:
Ivanov, A
Ginter, M
Powiązania:
https://bibliotekanauki.pl/articles/21566.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
fauna kopalna
Eastmanosteus
Pholidosteidae
ptyktodonty
Ptyctodontidae
Rhynchodus
Gory Swietokrzyskie
Selenosteidae
Titanichthyidae
paleontologia
plakodermy
Plourdosteidae
Holonematidae
dewon
Dinichthyidae
Opis:
Taxonomy of the Late Devonian placoderm remains from the Holy Cross Mountains, Poland, described by Gorizdro-Kulczycka (1934, 1950) and Kulczycki (1956, 1957), is revised. Several recently found specimens are also mentioned. The old collections are composed of representatives of Ptyctodontidae, Holonematidae, Plourdosteidae, Pholidosteidae, Selenosteidae, Titanichthyidae and Dinichthyidae, the latter with an undescribed species of Eastmanosteus. Newly found specimens belong to Ptyctodontidae, Plourdosteidae and Dinichthyidae. The occurrence of the Antiarcha in the Late Devonian of the Holy Cross Mountains, suggested by former authors, has not been confirmed.
Celem pracy jest rewizja taksonomiczna późnodewońskich plakodermów z Gór Świętokrzyskich, zebranych przez Jana Czarnockiego, Juliana Kulczyckiego i Zinaidę Gorizdro-Kulczycką. Zbiory te znajdują się obecnie w Muzeum Ziemi i w Muzeum Państwowego Instytutu Geologicznego w Warszawie. Ponadto opisano kilka nowych okazów, znalezionych w ostatnich latach przez Jerzego Dzika (Instytut Paleobiologii PAN) i Grzegorza Rackiego (Uniwersytet Śląski). Kolekcja starsza została po części opisana przez Gorizdro-Kulczycką (1934, 1950) i Kulczyckiego (1956, 1957). Okazy badane pochodzą przede wszystkim z Wietrzni, Kadzielni i Psich Górek w Kielcach oraz z Ostrówki i innych odsłonięć w regionie gałęzickim, a także z Kowali na południe od Kielc i Płucek w pobliżu Łagowa (Fig. 1). Ustalenie wieku okazów ze starszych kolekcji (Tabela 1) jest obecnie niezmiernie utrudnione. Wyżej wymienieni autorzy korzystali, przy określaniu pozycji stratygraficznej okazów, z podziału stratygraficznego używanego przez Czarnockiego (m.in. w Gorizdro-Kulczycka 1934). Czarnocki stosował swoisty trójdzielny podział franu i nie uwzględniał w rozważaniach stratygraficznych nieizochroniczności granic wydzieleń litostratygraftcznych w dewonie świętokrzyskim, spowodowanej m. in. synsedymentacyjną tektoniką blokową (Szulczewski 1989). Datowanie okazów nowych przedstawione jest w Tabeli 2. W starszych zbiorach stwierdzono obecność przedstawicieli rodzin Ptyctodontidae, Holonematidae, Plourdosteidae, Pholidosteidae, Selenosteidae, Titanichthyidae i Dinichthyidae. Zilustrowano nie opisane przez poprzedników fragmenty szkieletu Malerosteus gorizdroe Kulczycki, 1957: puszkę nosową (Fig. 3A-C) i płytkę zanosową (postnasale) (Fig. 3D-G). Wbrew doniesieniom Gorizdro-Kulczyckiej (1950) i Kulczyckiego (1957) nie potwierdzono obecności Antiarcha w badanym materiale. Okaz zaliczony przez Kulczyckiego (1957) do Bothriolepis (Antiarcha) jest prawdopodobnie przedstawicielem Brachythoraci (Arthrodira). Wśród okazów nowych znaleziono przedstawicieli Ptyctodontidae: fragmenty płytek zębowych (Fig. 2A-C) i brzusznej środkowej (medioventrale; Fig. 2E) Rhynchodus sp. oraz fragment kolca grzbietowego o nieokreślonej przynależności gatunkowej i rodzajowej (Fig. 2D). Oprócz ptyktodontów występują tam okazy Plourdosteidae i Dinichthyidae, a wśród tych ostatnich duża płytka karkowa (nuchale), należąca do Dunkleosteus sp. (Fig. 4A) oraz fragment grzbietu czaszki wraz z płytką szczękową dolną (inferognathale) młodocianego osobnika nowego gatunku z rodzaju Eastmanosteus (Fig. 4B). Należy on prawdopodobnie do tego samego gatunku, co najbardziej kompletny polski okaz Dinichthyidae, opisany przez Kulczyckiego (1957: pl. IV: 1, 2). Gatunkowi temu poświęcone będzie odrębne studium.
Źródło:
Acta Palaeontologica Polonica; 1997, 42, 3; 413-426
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new euselachian shark from the early Permian of the Middle Urals, Russia
Autorzy:
IVANOV, ALEXANDER O.
DUFFIN, CHRISTOPHER J.
NAUGOLNYKH, SERGE V.
Powiązania:
https://bibliotekanauki.pl/articles/945229.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
chondrichthyes
elasmobranchii
teeth
permian
russia
urals
Opis:
The isolated teeth of a new euselachian shark Artiodus prominens Ivanov and Duffin gen. et sp. nov. have been found in the Artinskian Stage (Early Permian) of Krasnoufimskie Klyuchiki quarry (Sverdlovsk Region, Middle Urals, Russia). The teeth of Artiodus possess a multicuspid orthodont crown with from four to nine triangular cusps; prominent labial projection terminating in a large round tubercle; distinct ornamentation from straight or recurved cristae; oval or semilunar, elongate, considerably vascularized base; dense vascular network formed of transverse horizontal, ascending, short secondary and semicircular canals. The teeth of the new taxon otherwise most closely resemble the teeth of some protacrodontid and sphenacanthid euselachians possessing a protacrodont-type crown, but differ from the teeth of all other known euselachians in the unique structure of the labial projection. The studied teeth vary in crown and base morphology, and three tooth morphotypes can be distinguished in the collection reflecting a moderate degree of linear gradient monognathic heterodonty. The range of morphologies otherwise displayed by the collection of teeth shows the greatest similarity to that described for the dentitions of relatively high-crowned hybodontids from the Mesozoic. The internal structure of the teeth, including their vascularization system is reconstructed using microtomography. The highest chondrichthyan taxonomic diversity is found in the Artinskian, especially from the localities of the Middle and South Urals.
Źródło:
Acta Palaeontologica Polonica; 2017, 62, 2; 290-298
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of human circle of Willis with and without aneurisms
Autorzy:
Ivanov, D.
Dol, A.
Pavlova, O.
Aristambekova, A.
Powiązania:
https://bibliotekanauki.pl/articles/307003.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
3D design
aneurysm
circle of Willis
hyperelastic material
mathematical modelling
mechanical tests
3D
model matematyczny
materiał hiperelastyczny
Opis:
Purpose: This paper includes results of the first stage of research aimed at the development of recommendations for physicians in order to help them to choose a particular type of cerebral arteries aneurysms treatment. Methods: Recent studies show that the majority of aneurysms develop as a result of hemodynamic and degenerative lesions of the vascular wall. Obviously, such wall damage can be studied using the methods of continuum mechanics and numerical simulations. Biomechanical modelling allows us to study hemodynamic parameters and stress-strain state of these arteries in health and disease, and to formulate practical recommendations for the necessity and reasonable selection of a particular type of cerebral arteries aneurysm treatment. Results: At this stage the realistic geometric models of arterial circle of Willis were built for its normal state and in the presence of aneurysms. The ultrasound analysis of circle of Willis was conducted in order to obtain blood flow parameters and the boundary conditions for carotid and vertebral arteries. Also, the mechanical properties of these arteries were investigated and constants of the Mooney–Rivlin strain energy function were obtained. Conclusions: Thus, the boundary problem describing the behaviour of human Willis circle arteries was stated. Further, this problem will be solved numerically using the finite element method. The numerical results will be analyzed from the point of view of the influence of the mechanical factors on the emergence, growth and rupture of circle of Willis aneurysms.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 2; 121-129
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł

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