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Wyświetlanie 1-15 z 44
Tytuł:
Parametric studies on split S-shaped composite meta atom for X-band communication
Autorzy:
Hasan, M. M.
Faruque, M. R. I.
Islam, M. T.
Powiązania:
https://bibliotekanauki.pl/articles/200602.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Capacitance
DNG
inductance
meta-atom
indukcyjność
meta atom
Opis:
The aim of this paper is to describe a split S-shaped composite meta atom which shows double negative characteristics at resonance frequency. The proposed meta-atom structure exhibits an almost 3.70 GHz bandwidth when the operating frequency from 8 to 14 GHz (X-band). In this study, the ring width, split width, size of substrate material, and the substrate material itself are varying to investigate their effect on the resonance frequencies. Metal strips of the outer resonator are the splits and the inner ring resonator is designed in a way that it forms a split S-shaped structure on the epoxy resin fibre (FR-4) substrate material. The CST Microwave Studio electromagnetic simulator software was used for the design and simulation purposes, and an Agilent N5227A vector network analyser was used for practical measurements.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 533-539
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atoms and ideals of pseudo-BCI-algebras
Autorzy:
Dymek, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/745502.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
pseudo-BCI-algebral atom
(closed) ideal
Opis:
The main subject of the paper are atoms and ideals of a pseudo-BCI-algebra. Many different characterizations of them are given. Some connections between ideals and subalgebras are presented. Conditions for the set \(At(X)\) of atoms of a pseudo-BCI-algebra \(X\) to be an ideal of \(X\) are established.
Źródło:
Commentationes Mathematicae; 2012, 52, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normal pseudo-BCK-algebras
Autorzy:
Dymek, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/745204.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
pseudo-BCK-algebra
subalgebra
ideal
atom
Opis:
A normal pseudo-BCK-algebra \(X\) is an algebra in which every subalgebra of \(X\) is an ideal of \(X\). Characterizations of normal pseudo-BCK-algebras are given.
Źródło:
Commentationes Mathematicae; 2011, 51, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Średni ciężar atomowy, średnia objętość i promień atomu chondrytu Creston (L5/6)
Mean atomic weight, mean volume and radius of atom of Creston (L5/6) chondrite
Autorzy:
Szurgot, Marian
Powiązania:
https://bibliotekanauki.pl/articles/30146488.pdf
Data publikacji:
2024-04
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Creston chondrite
Ensisheim chondrite
Jezersko chondrite
mean atomic weight
mean volume of atom
mean radius of atom
Opis:
Mean atomic weight Amean, mean volume and mean radius of atom of Creston ordinary chondrite (L5/6 S4 W0) felt in 2015 in Creston near Paso Robles, California has been calculated using literature data on chemical composition of the meteorite (Jenniskens et al. 2019). The aim of the studies was to determine Amean, Vatom, and Ratom values for this new meteorite, and compare the data with the values obtained for two other ordinary chondrites: Ensisheim (LL6), and Jezersko (H4). Calculations were conducted for the whole rock, for silicates, and for Fe, Ni metal of Creston, and Ensisheim chondrites. It was shown that the mean atomic weight of the whole rock of Creston chondrite Amean = 24.06. Creston’s silicates revealed the value: Ameansi = 21.92, and Creston’s Fe,Ni metal: Ameanmet = 56.25. It was calculated that the average volume of the Creston’s atom Vatom = 1.111·10–29 m3 (sample CR05), and 1.115·10–29 m3 (sample CR06). Average radius of Creston’s atom: Ratom = 138.5 pm, mean radius of atom of Creston silicates: Ratomsi = 138 pm, and mean radius of atom of Creston metal: Ratommet = 142 pm.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2024, 15; 116-128
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The scientific and cultural role of atomistics
Autorzy:
Sosnowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/147868.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
atom
history of science
structure of matter
Opis:
The development of the idea that atoms are the building blocks of matter is presented. This hypothesis began in the Ancient Greece and, independently, in the Ancient India. Arguments are presented that the fact that the atomic theory started in these two regions and not e.g. in Egypt, China or by the Mayas can be linked to their writing. In both Greece and India the alphabet contained letters and not pictograms as used in the three other cultures. The role of Islamic scholars in preserving the knowledge of the ancient atomic theories is presented. In the Middle Ages a significant part of the Greek philosophic treatises have been firstly learned via the Arab translations. It is shown that the atomic concept has not been developed in the Middle Ages. This was because the church found it to be in a disagreement with the Holy Scripture. The start of the modern scientific atomic theory is presented and the role of the established quantitative laws of chemical reactions is discussed. Arguments are presented that the atoms discovered in the nineteenth century did not have the qualities of the atoms proposed by the Ancient Greek philosophers. Contrary to the atoms proposed by the Greeks the former can be decomposed into more fundamental parts. The discussion of the possibility that quarks, leptons and quanta of interactions fields meet the above qualities is presented.
Źródło:
Nukleonika; 2005, 50,suppl.3; 5-10
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removable Edges on a Hamilton Cycle or Outside a Cycle in a 4-Connected Graph
Autorzy:
Wu, Jichang
Broersma, Hajo
Mao, Yaping
Ma, Qin
Powiązania:
https://bibliotekanauki.pl/articles/32083895.pdf
Data publikacji:
2021-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
4-connected graph
removable edge
fragment
atom
Opis:
Let G be a 4-connected graph. We call an edge e of G removable if the following sequence of operations results in a 4-connected graph: delete e from G; if there are vertices with degree 3 in G−e, then for each (of the at most two) such vertex x, delete x from G − e and turn the three neighbors of x into a clique by adding any missing edges (avoiding multiple edges). In this paper, we continue the study on the distribution of removable edges in a 4-connected graph G, in particular outside a cycle of G or in a spanning tree or on a Hamilton cycle of G. We give examples to show that our results are in some sense best possible.
Źródło:
Discussiones Mathematicae Graph Theory; 2021, 41, 2; 559-587
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical interpretation of the Cosserat mechanics for a collection of atoms
Autorzy:
Sikoń, M.
Powiązania:
https://bibliotekanauki.pl/articles/201587.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cosserat theory polar atom
mechanical quantum number
statistical mechanics
condensed matter
atom
mechanika kwantowa
mechanika statystyczna
materia skondensowana
teoria ośrodka Cosseratów
Opis:
In this work, the Cosserat medium is analyzes as a set of atoms. These atoms are under the action of a mechanical load. The statistical analysis is preceded by a description of a single atom using classical mechanics and quantum mechanics. The behavior of the atoms in the field generated by mechanical change of the interatomic distance is shown as a phenomenon which can explain the Cosserat mechanics in a continuum.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 333-338
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relatively complemented ordered sets
Autorzy:
Chajda, Ivan
Morávková, Zuzana
Powiązania:
https://bibliotekanauki.pl/articles/728820.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
modular ordered set
complemented
relatively complemented ordered set
atom
Opis:
We investigate conditions for the existence of relative complements in ordered sets. For relatively complemented ordered sets with 0 we show that each element b ≠ 0 is the least one of the set of all upper bounds of all atoms contained in b.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2000, 20, 2; 207-217
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen - some historical highlights
Autorzy:
Szydło, Zbigniew A.
Powiązania:
https://bibliotekanauki.pl/articles/1430284.pdf
Data publikacji:
2020
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
hydrogen
gas
chemistry
atom
experiment
wodór
gaz
chemia
eksperyment
Opis:
The early history of experiments in which an inflammable air was prepared is outlined. Once hydrogen had been discovered by Cavendish in 1766, the world of science and technology was given a colossal impetus. Its scientific and social consequences form the main focus of this essay. Special attention is given to explain why experiments were done, and their aims. The many difficulties which confronted scientists in the interpretation of their results are discussed. Timelines have been used in order to facilitate an understanding of the evolution of ideas. A particular emphasis is given to the story of how, through spectral analysis of the hydrogen atom, our understanding of atomic structure developed. Experiments involving hydrogen constitute important teaching material in schools. Detailed instructions are given for making hydrogen in the laboratory and for demonstrating its lightness and flammability. Suggestions are made of how to use these reactions to teach a wide variety of chemical concepts and facts.
Źródło:
Chemistry-Didactics-Ecology-Metrology; 2020, 25, 1-2; 5-34
2084-4506
Pojawia się w:
Chemistry-Didactics-Ecology-Metrology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron elastic collisions with C3F6 molecule
Autorzy:
Możejko, P.
Szmytkowski, Cz.
Powiązania:
https://bibliotekanauki.pl/articles/1954668.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
electron scattering
elastic cross section
hexafluoropropene
independent atom method
Opis:
We report calculations of differential and integral cross sections for intermediate- and high-energy (50-1000eV) elastic collisions of electrons with hexafluoropropene (C3F6) molecules. The calculations have been carried out using the independent atom model with static-polarization model potential. The present results are compared with elastic cross sections estimated from total and ionization experiments. Agreement between present calculations and the "experiment" is good for energies above 70eV.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 2; 171-178
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$(H_p,L_p)$-type inequalities for the two-dimensional dyadic derivative
Autorzy:
Weisz, Ferenc
Powiązania:
https://bibliotekanauki.pl/articles/1287322.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Hardy spaces
p-atom
interpolation
Walsh functions
dyadic derivative
Opis:
It is shown that the restricted maximal operator of the two-dimensional dyadic derivative of the dyadic integral is bounded from the two-dimensional dyadic Hardy-Lorentz space $H_{p,q}$ to $L_{p,q}$ (2/3 < p < ∞, 0 < q ≤ ∞) and is of weak type $(L_1,L_1)$. As a consequence we show that the dyadic integral of a ∞ function $f ∈ L_1$ is dyadically differentiable and its derivative is f a.e.
Źródło:
Studia Mathematica; 1996, 120, 3; 271-288
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fejér means of two-dimensional Fourier transforms on $H_p(ℝ × ℝ)$
Autorzy:
Weisz, Ferenc
Powiązania:
https://bibliotekanauki.pl/articles/1396031.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
p-atom
Hardy spaces
atomic decomposition
interpolation
Fejér means
Opis:
The two-dimensional classical Hardy spaces $H_p(ℝ × ℝ)$ are introduced and it is shown that the maximal operator of the Fejér means of a tempered distribution is bounded from $H_p(ℝ × ℝ)$ to $L_p(ℝ^2)$ (1/2 < p ≤ ∞) and is of weak type $(H^{#}_1 (ℝ × ℝ), L_1(ℝ^2))$ where the Hardy space $H^#_1(ℝ × ℝ)$ is defined by the hybrid maximal function. As a consequence we deduce that the Fejér means of a function f ∈ $H_1^#(ℝ × ℝ)$ ⊃ $LlogL(ℝ^2)$ converge to f a.e. Moreover, we prove that the Fejér means are uniformly bounded on $H_p(ℝ × ℝ)$ whenever 1/2 < p < ∞. Thus, in case f ∈ $H_p(ℝ × ℝ)$, the Fejér means converge to f in $H_p(ℝ × ℝ)$ norm (1/2 < p < ∞). The same results are proved for the conjugate Fejér means.
Źródło:
Colloquium Mathematicum; 1999, 82, 2; 155-166
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On branchwise commutative pseudo-BCH algebras
Autorzy:
Walendziak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/747105.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
(Pseudo-)BCK/BCI/BCH-algebra
atom
branch
branchwise commutativity
Opis:
Basic properties of branches of pseudo-BCH algebras are described. Next, the concept of a branchwise commutative pseudo-BCH algebra is introduced. Some conditions equivalent to branchwise commutativity are given. It is proved that every branchwise commutative pseudo-BCH algebra is a pseudo-BCI algebra.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2017, 71, 2
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some non-homogeneous Hardy spaces on locally compact Vilenkin groups
Autorzy:
Lu, Shanzhen
Yang, Dachun
Powiązania:
https://bibliotekanauki.pl/articles/965121.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Vilenkin group
dual space
Herz space
atom
Hardy space
molecule
Źródło:
Colloquium Mathematicum; 1996, 69, 1; 1-17
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-parameter Hardy-Littlewood inequalities
Autorzy:
Weisz, Ferenc
Powiązania:
https://bibliotekanauki.pl/articles/1287705.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Hardy spaces
rectangle p-atom
atomic decomposition
Hardy-Littlewood inequalities
Opis:
The inequality (*) $(∑_{|n|=1}^{∞} ∑_{|m|=1}^{∞} |nm|^{p-2} |f̂(n,m)|^p)^{1/p} ≤ C_p ∥ƒ∥_{H_p}$ (0 < p ≤ 2) is proved for two-parameter trigonometric-Fourier coefficients and for the two-dimensional classical Hardy space $H_p$ on the bidisc. The inequality (*) is extended to each p if the Fourier coefficients are monotone. For monotone coefficients and for every p, the supremum of the partial sums of the Fourier series is in $L_p$ whenever the left hand side of (*) is finite. From this it follows that under the same condition the two-dimensional trigonometric-Fourier series of an arbitrary function from $H_1$ converges a.e. and also in $L_1$ norm to that function.
Źródło:
Studia Mathematica; 1996, 118, 2; 175-184
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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