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Wyświetlanie 1-15 z 212
Tytuł:
A function space Cp(X) not linearly homeomorphic to Cp(X) × ℝ
Autorzy:
Marciszewski, Witold
Powiązania:
https://bibliotekanauki.pl/articles/1205429.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
function space
pointwise convergence topology
$c_p(X)$
linear homeomorphism
Opis:
We construct two examples of infinite spaces X such that there is no continuous linear surjection from the space of continuous functions $c_p(X)$ onto $c_p(X)$ × ℝ$. In particular, $c_p(X)$ is not linearly homeomorphic to $c_p(X)$ × ℝ$. One of these examples is compact. This answers some questions of Arkhangel'skiĭ.
Źródło:
Fundamenta Mathematicae; 1997, 153, 2; 125-40
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A linear programming based analysis of the CP-rank of completely positive matrices
Autorzy:
Li, Y.
Kummert, A.
Frommer, A.
Powiązania:
https://bibliotekanauki.pl/articles/907323.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
macierz pozytywna
programowanie liniowe
algorytm Simplex
completely positive matrices
cp-rank
linear programming
simplex algorithm
basic feasible solution
pivot process
Opis:
A real matrix A is said to be completely positive (CP) if it can be decomposed as A= B BT, where the real matrix B has exclusively non-negative entries. Let k be the rank of A and Phik the least possible number of columns of the matrix B, the so-called completely positive rank (cp-rank) of A. The present work is devoted to a study of a general upper bound for the cp-rank of an arbitrary completely positive matrix A and its dependence on the ordinary rank k. This general upper bound of the cp-rank has been proved to be at most k(k + 1)/2. In a recent pioneering work of Barioli and Berman it was slightly reduced by one, which means that Phik \leq k(k + 1)/2-1 holds for k \geq 2. An alternative constructive proof of the same result is given in the present paper based on the properties of the simplex algorithm known from linear programming. Our proof illuminates complete positivity from a different point of view. Discussions concerning dual cones are not needed here. In addition to that, the proof is of constructive nature, i.e. starting from an arbitrary decomposition A= B1 B1T (B1\geq 0) a new decomposition A= B2 B2T (B2\geq 0) can be generated in a constructive manner, where the number of column vectors of B2 does not exceed k(k + 1)/2-1. This algorithm is based mainly on the well-known techniques stemming from linear programming, where the pivot step of the simplex algorithm plays a key role.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 1; 25-31
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aluminium Morphological Modification by Nitrogen-Argon Mixture PIII
Autorzy:
Muñoz-Castro, A.
López-Callejas, R.
Valencia Alvarado, R.
Peña-Eguiluz, R.
Mercado-Cabrera, A.
Barocio, S.
Rodríguez-Méndez, B.
de la Piedad-Beneitez, A.
Powiązania:
https://bibliotekanauki.pl/articles/1504099.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.40.Hf
52.77.Dq
81.65.-b
61.05.cp
62.20.Qp
68.37.Hk
Opis:
With incident fluences of ≈ $10^{12}$ atoms/$cm^2$ aluminium samples have been plasma immersion ion implanted with either pure nitrogen or argon/nitrogen mixtures at temperatures around 450°C. X-ray diffraction studies have validated the formation of the cubic phase of AlN, in samples treated with both the gas mixtures and pure nitrogen. Likewise, the presence of the hexagonal phase of AlN has been detected when either pure nitrogen or a 70%N/30%Ar mixture have been used. The signature peak of AlN has also been confirmed by the Raman spectroscopy. The maximal microhardness values were found in samples treated with the mixture. The maximal roughness was achieved with the equal part mixture in all cases, although increasing with the implantation pulse width up to a 300 nm peak at 150 μs. The latter critical value remains invariant under the pure nitrogen plasma treatment, provided that implantation periods in the order of 4.5 h are carried out.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 167-170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of rubber forming process of fire barrier from titanium CP2 alloy for AW 139 helicopter
Autorzy:
Krakowski, M.
Bartnicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/101987.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
titanium CP2
rubber forming
Opis:
This paper presents conditions of forming products from titanium sheets by means of rubber stamping method. After introducing the issues connected with these elements manufacturing for aviation industry, considering standards and legal regulations, technological problems occurring during forming deep stiffening ribs. The results in the characteristic curvatures and distortion in the final products were generated in the process heterogeneous internal stress state. The Authors aimed at explaining and presenting of solutions limiting occurrence of chosen shape faults, which disqualify these products application in aviation industry. The proposed solutions significantly reduced the incidence of these unfavorable phenomena. The modified method of rubber stamping of firewall from titanium alloy CP-2 sheet was successfully implemented in manufacturing conditions of PZL Swidnik.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 26; 66-71
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of texture and microstructure of annealed Fe-23Mn-3Si-3Al steel
Autorzy:
Kowalska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1075630.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Ef
81.40.-z
61.05.cp
61.50.Ks
68.37.Lp
Opis:
Texture and microstructural examinations of Fe-23%Mn-3%Si-3%Al (mass%) alloy are presented. After casting the ingot was homogenized at 1150°C, hot-rolled in the temperature range 1200°C-900°C and then cold-rolled. Steel samples, after 40% deformation, were annealed at 300°C for 10 min, 600°C and 750°C for 30 min. X-ray diffraction and metallographic studies revealed deformation-induced mechanical twinning and phase transformation. The crystallographic Shoji-Nishiyama and Kurdjumov-Sachs relations between martensite (ε, α') and austenite (γ), were found in the cold-rolled material. During annealing the reverse martensite to austenite transformation occurred.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 946-949
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular Distribution of N-Doped Carbon Nanotubes in Alumina Membrane Channels: A High-Energy X-ray Diffraction Study
Autorzy:
Hawelek, L.
Brodka, A.
Dore, J.
Honkimäki, V.
Kyotani, T.
Yang, Q.
Burian, A.
Powiązania:
https://bibliotekanauki.pl/articles/1538877.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
61.48.De
Opis:
An alignment study of multi-wall N-doped carbon nanotubes prepared by a template pyrolytic carbon deposition method inside channels of an alumina membrane has been performed using high-energy X-ray diffraction on the ID15B beamline at the European Synchrotron Radiation Facility (ESRF, Grenoble). The two-dimensional diffraction pattern of the deposited carbon nanotubes, recorded directly, within the alumina membrane, using an image plate detector, exhibits two non-continuous arcs corresponding to the 002 graphitic reflection. The following values of the angle between the axis of the carbon nanotubes lying along the membrane channels and the incident beam were taken for five positions: 0°, 30°, 45°, 60° and 90°. The anisotropic scattering distribution of the two-dimensional patterns indicates an orientational alignment of the nanotubes. The one-dimensional intensity patterns obtained by scanning around the circumference of the (0 0 2) ring have allowed an estimation of the angular distribution of the nanotubes axes.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 302-306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing Effects after Various Thermo-Mechanical Treatments on Microstructure and Mechanical Properties of Wrought Magnesium Alloy ZK60
Autorzy:
Oo, M.
Janeček, M.
Kral, R.
Wagner, L.
Powiązania:
https://bibliotekanauki.pl/articles/1419020.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Gh
81.07.Bc
61.05.cp
Opis:
The magnesium alloy ZK60 received from Dead Sea Magnesium in direct-chill cast condition was extruded at T = 350C using an extrusion ratio of ER = 12. The extruded bars were severely plastically deformed at 250C by either equal channel angular pressing or swaging. While swaging led to similar grain refinements as observed after equal channel angular pressing, yield stress and tensile strength values were by far superior in the swaged material. This result is explained by the unfavourable 45° texture component of the (0002) pole figure that develops during the massive shear deformation in equal channel angular pressing. Unlike equal channel angular pressing, the grain orientation after swaging is similar as in the as-extruded condition. Annealing at elevated temperatures indicates very low thermal stability of microstructure and mechanical properties in the equal channel angular pressing material while both properties in the swaged microstructure are as stable as in the as-extruded reference.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 606-609
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of different computational environments to optimization of makespan in the flow production line
Autorzy:
Sitek, P.
Wikarek, J.
Powiązania:
https://bibliotekanauki.pl/articles/118201.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
CP
CLP
CCP
scheduling
Opis:
A mathematical model of makespan optimization in the divided flow production line is presented. The methodology of Constraint Programming and Integer Programming to optimization of makespan in the above environment have been considered. Multiple examples illustrate the concept proposed
Źródło:
Applied Computer Science; 2005, 1, 1; 220-239
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of differential PDF to the structural characterization of supported catalysts
Autorzy:
Sommariva, M.
Dadivanyan, N.
Gateshki, M.
Rayner, M.
Lukashuk, L.
Rupprechter, G.
Föttinger, K.
Powiązania:
https://bibliotekanauki.pl/articles/1112335.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cf
61.05.cp
07.85.Jy
82.45.Jn
Opis:
This paper reports the use of a differential PDF approach performed on a laboratory X-ray diffractometer, for the analysis of nanosized PdO phase distributed on the reducible Fe₂O₃ support.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 884-885
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the expert computer system to design the hot strip rolling technology in the LPS line
Zastosowanie komputerowego systemu eksperckiego do projektowania technologii walcowania na gorąco blach w LPS
Autorzy:
Rauch, Ł.
Gołąb, R.
Kuziak, R.
Pidvysots'kyy, V.
Pietrzyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/182439.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:
system ekspertowy
walcowanie na gorąco
projektowanie technologii
stal konstrukcyjna CP
expert system
hot strip rolling
technology design
constructional steel
Opis:
Application of computer systems in industry becomes more and more frequent, in particular in those companies which are exposed to fast changes in the market due to the changing needs of products consumers. In the metals processing industry, these changes concern mainly the properties of semiproducts and products. Usually series of costly experimental trials are performed to meet these requirements. Therefore, there is a need for computer systems, which will aid design of the technology and allow decreasing the number of experimental trials. Details of the expert system applied to the analysis and optimization of the hot strip rolling technology in the semi-industrial rolling line (LPS) are described in the paper. Constructional multi-phase (CP) steel was selected for the analysis. Material models, developed for the investigated steel on the basis of experimental tests carried out at the Institute for Ferrous Metallurgy, were implemented in the system. Results of performed numerical simulations using the system are presented.
Zastosowanie systemów komputerowych w przemyśle jest coraz częstsze, co szczególnie jest widoczne w przedsiębiorstwach nastawionych na bezpośredni kontakt ze zmieniającymi się potrzebami klientów. W przetwórstwie metali ma to przede wszystkim odzwierciedlenie w zapotrzebowaniu klientów na specyficzne własności półproduktów i wyrobów finalnych. Aby sprostać tym wymaganiom, zwykle konieczne jest podjęcie wielu kosztowych analiz doświadczalnych, które metodą prób i błędów dają oczekiwany rezultat. Dlatego potrzebne są systemy komputerowe oferujące funkcjonalność hybrydową, łączącą symulacje numeryczne, optymalizację i wiedzę ekspercką wspomagającą projektowanie technologii. W artykule przedstawiono szczegóły projektu oraz implementacji systemu, który został wykonany dla wspomagania projektowania technologii z wykorzystaniem Linii Półprzemysłowej Symulacji (LPS). Możliwości systemu przedstawiono na przykładzie stali konstrukcyjnej CP. W systemie zaimplementowano modele dla tej stali opracowane na podstawie badań wykonanych w IMŻ. W artykule zaprezentowano wyniki symulacji numerycznych wykonanych z wykorzystaniem zaproponowanego systemu.
Źródło:
Prace Instytutu Metalurgii Żelaza; 2012, T. 64, nr 1, 1; 104-109
0137-9941
Pojawia się w:
Prace Instytutu Metalurgii Żelaza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automation and Remote Synchrotron Data Collection
Autorzy:
Gilski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812241.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.Qe
61.05.cp
61.05.cf
Opis:
X-ray crystallography is the natural choice for macromolecular structure determination by virtue of its accuracy, speed, and potential for further speed gains, while synchrotron radiation is indispensable because of its intensity and tuneability. Good X-ray crystallographic diffraction patterns are essential and frequently this is achievable through using the few large synchrotrons located worldwide. Beamline time on these facilities have long queues, and increasing the efficiency of utilization of these facilities will help in expediting the structure determination process. Automation and remote data collection are therefore essential steps in ensuring that macromolecular structure determination becomes a very high throughput process.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 331-338
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Benzo[a]pyrene and cyclopenta[c]phenanthrene suppress expression of p53 in head kidney of rainbow trout
Autorzy:
Brzuzan, P.
Woźny, M.
Góra, M.
Łuczyński, M. K.
Jabłońska, A.
Powiązania:
https://bibliotekanauki.pl/articles/363082.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
B[a]P
CP[c]Ph
ekspresja genów
hnRNA
pstrąg tęczowy
poziom transkrypcji
gene expression
rainbow trout
transcription rate
Opis:
Although p53, a protein of important tumor suppressive function, has been extensively studied in mammals, relatively little is known about the p53 pathways in lower vertebrates. Particularly, limited information exists on possible influences of environmental contaminants on the expression of the p53 gene in fish. In the current study, we assessed the effects of benzo[a]pyrene (B[a]P; potent tumor promoter) and cyclopenta[c]phenanthrene (CP[c]Ph; clastogenic agent) exposure on a 24h profile of p53 gene expression in head kidney of juvenile rainbow trout (Oncorhynchus mykiss). To analyze the p53 transcription rate, we developed protocol for the examination of both mRNA and heterogeneous nuclear (hn) RNA of the gene, using Real-Time RTPCR approach. The results show that both compounds are capable of suppressing p53 transcriptional activity within 12h of the treatment. Our finding supports the idea that structurally different PAHs may influence cell physiologic functions controlled by p53 in fish, in part, by down-regulating its RNA expression levels.
Źródło:
Environmental Biotechnology; 2011, 7, 1; 41-45
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bond Strength of Basalt Based Glass-Ceramic Coatings
Autorzy:
Bayrak, G.
Ercenk, E.
Sen, U.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1194582.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
62.20.-x
61.05.cp
Opis:
In the present study, powders produced from the volcanic basalt rocks were coated on pre-coated AISI 1040 steel with Ni-5% Al bond coat by atmospheric plasma spray coating technique. The coated specimens were characterized by optical microscopy, scanning electron microscopy, metallography and X-ray diffraction. Bonding strength of coatings was evaluated in accordance with the ASTM C-633 method. Coated basalt material from the APS coating system was determined in the glassy amorphous state by X-ray diffraction analysis. The coated samples were heat-treated at 800C for 1-4 h for crystallization. The phases formed in the basalt base glass-ceramic coatings were augite, Fe-diopside, anorthite, and andesine which were detected by X-ray diffraction analysis. Basalt based glass-ceramic coatings include splat, porosity and un-melted particles which were the characteristic of plasma sprayed coatings. Experiment result showed that the crystallization time increase caused the decrease of the bond strengths of the coatings.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 620-622
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Catalytic compositions based on chlorides of d metals and natural aluminosilicates for the low-temperature sulfur dioxide oxidation with air oxygen
Autorzy:
Rakitskaya, T.
Kiose, T.
Golubchik, K.
Dzhiga, G.
Ennan, A.
Volkova, V.
Powiązania:
https://bibliotekanauki.pl/articles/1052764.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
33.20.Ea
81.05.Ni
Opis:
Samples of natural bentonite and clinoptilolite modified with copper(II), iron(III), and palladium(II) were characterized by both X-ray phase and the Fourier transform infrared spectral methods. The activity of monometallic compositions M_{i}L_{j}/S(M = Co(II), Fe(III), and Pd(II); L = NO₃¯, Cl¯, and SO₄²¯; S = N-CLI or N-Bent) in the reaction with sulfur dioxide was found to depend on the nature of both a metal ion and a support. For bimetallic compositions Cu(II)-Fe(III) and Cu(II)-Pd(II) based on the natural aluminosilicates, a certain synergism in the action of metals forming these pairs towards the reaction of sulfur dioxide oxidation with oxygen was determined.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1074-1078
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 212

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