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Wyświetlanie 1-15 z 167
Tytuł:
On soluble groups of automorphisms of nonorientable Klein surfaces
Autorzy:
Gromadzki, G.
Powiązania:
https://bibliotekanauki.pl/articles/1214948.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Riemann surfaces
Klein surfaces
automorphism groups
soluble groups
Opis:
We classify up to topological type nonorientable bordered Klein surfaces with maximal symmetry and soluble automorphism group provided its solubility degree does not exceed 4. Using this classification we show that a soluble group of automorphisms of a nonorientable Riemann surface of algebraic genus q ≥ 2 has at most 24(q-1) elements and that this bound is sharp for infinitely many values of q.
Źródło:
Fundamenta Mathematicae; 1992, 141, 3; 215-227
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cytotoxic surfaces for regional chemotherapy
Autorzy:
Krukiewicz, K.
Cichy, M.
Turczyn, R.
Jarosz, T.
Zak, J. K.
Bednarczyk-Cwynar, B.
Ruszkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/285824.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
chemotherapy
surfaces
cytotoxicity
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 78
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bacteria adhesion to graphenic surfaces
Autorzy:
Duch, J.
Golda-Cepa, M.
Kotarba, A.
Powiązania:
https://bibliotekanauki.pl/articles/283807.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
graphene
surfaces
bacteria
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 68
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equations defining reducible Kummer surfaces in ℙ⁵
Autorzy:
Szemberg, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1311245.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Kummer surfaces
intersections of quadrics
Opis:
Principally polarized abelian surfaces are the Jacobians of smooth genus 2 curves or of stable genus 2 curves of special type. In [S] we studied equations describing Kummer surfaces in the case of an irreducible principal polarization on the abelian surface. The aim of this note is to give a treatment of the second case. We describe intermediate Kummer surfaces coming from abelian surfaces carrying a product principal polarization. In Proposition 12 we give explicit equations of these surfaces in ℙ⁵.
Źródło:
Annales Polonici Mathematici; 1996, 63, 1; 51-62
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZABYTKOWE NAWIERZCHNIE ULIC W SZCZECINIE
HISTORICAL STREET SURFACES IN SZCZECIN
Autorzy:
Kozinska, Bogdana
Makowska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/538530.pdf
Data publikacji:
2006
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
STONE PAVING
STREET SURFACES
SZCZECIN
Opis:
Recently it has become customary to describe street surfaces as their 'fourth dimension', 'floor' or 'horizontal elevation'. These terms testify to the growing role played by this particular element of town outfitting which for years has been forgotten and treated in a purely utilitarian manner associated solely with communication: street traffic and pedestrians. The very nature of the streets depended on their geographic location and changed with the progress of civilisation and the expansion of human adobes. The most popular form of historical nineteenth century surfaces was stone - the heritage of the experiences and tradition of the industrialization epoch. Originally, use was made of the so-called wild pavement, i. e. cobblestones which have survived mainly in the outskirts and small towns. Larger centres tried to grant their streets a more refined appearance by resorting to dressed stone and differentiated paving. Not until the 1980s did certain environments perceive street paving as an element of valuable historical development. The state of the preservation of historical pavements and streets in Szczecin has been examined in the course of two inventories carried out in 1999 and 2004, verifying the universal opinion about their unsatisfactory technical state and predominantly disclosing the enormous and variegated resources (project, material and aesthetic).
Źródło:
Ochrona Zabytków; 2006, 1; 52-72
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nawierzchnie jasne i rozjaśniane. teoria i praktyka
Bright and bleached surfaces. theory and practice
Autorzy:
Filipczyk, M.
Kukielska, D.
Powiązania:
https://bibliotekanauki.pl/articles/89230.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
nawierzchnie jasne
nawierzchnie rozjaśniane
kruszywa jasne
luminancja
bright surfaces
bleached surfaces
bright aggregates
luminance
Opis:
Przedstawiono podstawowe informacje na temat nawierzchni jasnych i rozjaśnianych oraz stosowanych kruszyw. Rozważono również wady i zalety poszczególnych rozwiązań. Artykuł ma charakter poglądowy.
Provides basic information on the bright and bleached surfaces and used aggregates. It was also considered the advantages and disadvantages of each solution. The article is illustrative.
Źródło:
Mining Science; 2016, 23, Special Issue 1; 17-22
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reidemeister-type moves for surfaces in four-dimensional space
Autorzy:
Roseman, Dennis
Powiązania:
https://bibliotekanauki.pl/articles/1342427.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
knotted 3-manifolds
regular isotopy
twist-spun knots
knot moves
immersions of surfaces
knotted surfaces
Opis:
We consider smooth knottings of compact (not necessarily orientable) n-dimensional manifolds in $ℝ^{n+2}$ (or $S^{n+2}$), for the cases n=2 or n=3. In a previous paper we have generalized the notion of the Reidemeister moves of classical knot theory. In this paper we examine in more detail the above mentioned dimensions. Examples are given; in particular we examine projections of twist-spun knots. Knot moves are given which demonstrate the triviality of the 1-twist spun trefoil. Another application is a smooth version of a result of Homma and Nagase on a set of moves for regular homotopies of surfaces.
Źródło:
Banach Center Publications; 1998, 42, 1; 347-380
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neotectonics and planation surfaces in the High Bieszczady Mountains (Outer Carpathians, Poland )
Autorzy:
Kukulak, J.
Powiązania:
https://bibliotekanauki.pl/articles/191613.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
planation surfaces
neotectonics
Bieszczady Mountains
Polska
Opis:
The interfluves and slopes of the High Bieszczady Mts., SE Poland, bear flat surfaces that are both structurally-controlled and represent fragments of planation surfaces. More extensive are planated surfaces that can be associated with the intramontane, foothills, and riverside levels of planation. The oldest planated surfaces are most numerous in the most elevated parts of the Bieszczady Mountains. Older surfaces display traces of relief rejuvenation, including steps and minor ridges developed upon thick-bedded sandstones. These planated levels display relief energy of 50-100 m, increasing within older landforms of that type. Locally occurring rolling topography of structurally-controlled flat surfaces appears to result from tectonic undulations and the presence of fault zones. Strong structural control dominating the topography of the Bieszczady Mts. obliterates any possible young tectonic influcences upon development of flat surfaces on the slopes.
Źródło:
Annales Societatis Geologorum Poloniae; 2004, 74, No 3; 339-350
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scattering of plane acoustic waves at elastic particles with rough surfaces
Autorzy:
Bjørnø, L.
Powiązania:
https://bibliotekanauki.pl/articles/332313.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
ultrasonic waves
acoustic waves
rough surfaces
Opis:
A comprehensive theoretical and numerical study oj the influence oj surface roughness oj elastic particles in water on the scattering oj ultrasonic waves has been carried out. For near spherical shape oj the particles and with small rms-roughness heights a perturbation method has been developed. In this method the first-order perturbation contribution predicts the contribution to the incoherently scattered acoustic field due to surjace roughness, and the second-order perturbation contribution predicts the change in the coherent field and will satisfy the requirement oj energy conservation. The second-order perturbation contribution is evaluated using the concept ojform function, while the first-order perturbation to the total scattered acoustic field is evaluated using the scattering cross-section. As a junction oj the ka-value and jor different rms-roughness heights a numerical study oj the jorward and backward scattering from rough, elastic particles has been carried out and a substantial roughness influence on the scattered field has been verified. Same experimental resultsfrom measurements oj scattering jrom glass and cast iron spheres have given evidence to the numerical predictions.
Źródło:
Hydroacoustics; 2003, 6; 7-18
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adhesion, growth and osteogenic differentiation of human bone marrow mesenchymal stem cells on positively and negatively charged ferroelectric crystal surfaces
Autorzy:
Bacakova, L.
Vandrovcova, M.
Vanek, P.
Petzelt, J.
Powiązania:
https://bibliotekanauki.pl/articles/284786.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomaterials
mesenchymal stem cells
crystal surfaces
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 28
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement, modeling and evaluation of surface parameter using capacitive-sensor-based measurement system
Autorzy:
Murugarajan, A.
Samuel, G. L.
Powiązania:
https://bibliotekanauki.pl/articles/221773.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
capacitive sensor
surface roughness
machined surfaces
Opis:
Surface roughness parameter prediction and evaluation are important factors in determining the satisfactory performance of machined surfaces in many fields. The recent trend towards the measurement and evaluation of surface roughness has led to renewed interest in the use of newly developed non-contact sensors. In the present work, an attempt has been made to measure the surface roughness parameter of different machined surfaces using a high sensitivity capacitive sensor. A capacitive response model is proposed to predict theoretical average capacitive surface roughness and compare it with the capacitive sensor measurement results. The measurements were carried out for 18 specimens using the proposed capacitive-sensor-based non-contact measurement setup. The results show that surface roughness values measured using a sensor well agree with the model output. For ground and milled surfaces, the correlation coefficients obtained are high, while for the surfaces generated by shaping, the correlation coefficient is low. It is observed that the sensor can effectively assess the fine and moderate rough-machined surfaces compared to rough surfaces generated by a shaping process. Furthermore, a linear regression model is proposed to predict the surface roughness from the measured average capacitive roughness. It can be further used in on-machine measurement, on-line monitoring and control of surface roughness in the machine tool environment.
Źródło:
Metrology and Measurement Systems; 2011, 18, 3; 403-418
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
General directions in contact modelling development
Autorzy:
Maciolka, Pawel
Jedrzejewski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/99664.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
flat surfaces
contact
asperity
FE model
Opis:
This paper presents a survey of works, selected from the period of the last twenty years, on deformations in the contact between rough surfaces. All the selected works use FEM. They deal with the modelling of individual contact asperities or the use of experiment to verify contact models. First, research directions connected with the modelling of single asperities, whose shape is usually approximated with that of a hemisphere or a half cylinder, are presented. Section 3 discusses research directions concerning models which include the layer under asperities, and models for small contact surfaces (about 1 mm2). Section 4 reviews directions in contact modelling which takes into account neighbouring asperities and laterally loaded asperities. Section 5 discusses directions in the development of models and experiments used or suitable for verifying models. Finally, conclusions concerning accurate contact deformation modelling are presented.
Źródło:
Journal of Machine Engineering; 2019, 19, 4; 91-109
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy of the soil sealing enhancement product for Poland
Autorzy:
Krówczyńska, Małgorzata
Soszyńska, Agnieszka
Pabjanek, Piotr
Wilk, Ewa
Hurbanek, Pavol
Rosina, Konstantin
Powiązania:
https://bibliotekanauki.pl/articles/1052829.pdf
Data publikacji:
2016-09-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
soil sealing
impervious surfaces
land cover
Polska
Opis:
Increasing urbanization results in constant enlarging of the artificial area closed to water infiltration. In 2006–2008, the Soil Sealing Enhancement (SSE) database was the part of the GMES Fast Track Service on Land Monitoring. The accuracy of the final product set by the authors should reach at least 85%. Orthorectified high resolution aerial photos of Poland were used to develop reference data constituting 20,000 random samples around the country. In each sample, the points were classified into three possible surface classes: natural, artificial and semi-sealed. Comparison of reference data to original project statistics revealed the values of accuracy, commission and omission errors in the SSE dataset. Although, SSE accuracy in Poland fulfils the criteria set by SSE authors with overall accuracy of 99.5%, the individual analysis for each category reveals many weaknesses. Preliminary interpretation of mistakes leads to the conclusion that the spatial resolution of pictures used in the SSE project is insufficient. In several cases, validation proved that omission errors were made in relation to construction sites or recently constructed buildings. It should be stated that the accuracy of SSE product for Poland should be treated as the maximum value of impervious surfaces.
Źródło:
Quaestiones Geographicae; 2016, 35, 3; 89-95
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of singular germs of mappings and deformations of compact surfaces of class VII₀
Autorzy:
Dloussky, Georges
Kohler, Franz
Powiązania:
https://bibliotekanauki.pl/articles/1294193.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
surfaces of class VII₀
germs of mappings
Opis:
We classify generic germs of contracting holomorphic mappings which factorize through blowing-ups, under the relation of conjugation by invertible germs of mappings. As for Hopf surfaces, this is the key to the study of compact complex surfaces with $b_1=1$ and $b₂ >0$ which contain a global spherical shell. We study automorphisms and deformations and we show that these generic surfaces are endowed with a holomorphic foliation which is unique and stable under any deformation.
Źródło:
Annales Polonici Mathematici; 1998, 70, 1; 49-83
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surfaces in 3-space that do not lift to embeddings in 4-space
Autorzy:
Carter, J.
Saito, Masahico
Powiązania:
https://bibliotekanauki.pl/articles/1342343.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
orientations
triple points
Boy's surface
knotted surfaces
Opis:
A necessary and sufficient condition for an immersed surface in 3-space to be lifted to an embedding in 4-space is given in terms of colorings of the preimage of the double point set. Giller's example and two new examples of non-liftable generic surfaces in 3-space are presented. One of these examples has branch points. The other is based on a construction similar to the construction of Giller's example in which the orientation double cover of a surface with odd Euler characteristic is immersed in general position. A similar example is shown to be liftable with an explicit lifting given. The problem of lifting is discussed in relation to the theory of surface braids. Finally, the orientations of the double point sets are studied in relation to the lifting problem.
Źródło:
Banach Center Publications; 1998, 42, 1; 29-47
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 167

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