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Tytuł:
Classification of (1,1) tensor fields and bihamiltonian structures
Autorzy:
Turiel, Francisco
Powiązania:
https://bibliotekanauki.pl/articles/1359599.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
(1,1) tensor field
bihamiltonian structure
Opis:
Consider a (1,1) tensor field J, defined on a real or complex m-dimensional manifold M, whose Nijenhuis torsion vanishes. Suppose that for each point p ∈ M there exist functions $f_{1},...,f_{m}$, defined around p, such that $(df_{1} ∧ ... ∧ df_{m})(p) ≠ 0$ and $d(df_{j}(J( )))(p) = 0$, j = 1,...,m. Then there exists a dense open set such that we can find coordinates, around each of its points, on which J is written with affine coefficients. This result is obtained by associating to J a bihamiltonian structure on T*M.
Źródło:
Banach Center Publications; 1996, 33, 1; 449-458
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of diagnostic symptom values using a set of models GM(1,1) and a moving window method
Prognoza wartości symptomów diagnostycznych za pomocą zbioru modeli GM(1,1) i metody ruchomego okna
Autorzy:
Tabaszewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/327728.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
condition monitoring
symptom forecasting
GM(1,1) models
diagnostyka techniczna
prognoza
model GM(1,1)
Opis:
The aim of this paper is to show methodology of forecasting with various horizon of prediction using grey system theory, basing on practical application to vibration condition monitoring problems. The method of forecasting was based on GM(1,1) prognostic models with various window lengths for estimating model parameters. The model GM(1,1) is very effective where we have only few data, incomplete, and with low accuracy. The moving window method applied to GM(1,1) model enables to adapt to changes in data trend. However, selecting an inappropriate window length can result in excessive forecast errors. The applied algorithm is based on tracking the current prediction error for models having various window lengths, and then eliminating the models for which the error of prediction caused by the loss of adequacy of the model to the data increases excessively.
Celem pracy jest przedstawienie metodyki prognozowania dla różnych horyzontów prognozy z wykorzystaniem teorii szarych systemów w odniesieniu do praktycznego problemu z zakresu drganiowej diagnostyki maszyn. Metoda prognozowania jest oparta o modele GM(1,1) o różnej długości okna w której wyznacza się parametry modelu. Model GM(1,1) jest bardzo efektywny gdy istnieje niewiele danych, są one niekompletne i są niskiej jakości. Metoda ruchomego okna w zastosowaniu do modelu GM(1,1) pozwala na budowanie modelu adaptacyjnego, który umożliwia dostosowanie się do zmian w trendzie krzywej życia. Niestety źle dobrana długość okna może powodować zwiększenie się błędu prognozy w porównaniu do warunków, w których długość okna byłaby optymalna. Zastosowany algorytm polega na śledzeniu aktualnego błędu prognozy modeli o różnej długości okna i eliminacji znaczenia tych modeli, które powodują nadmierny wzrost błędu prognozy związany z utratą adekwatności do danych.
Źródło:
Diagnostyka; 2014, 15, 3; 65-68
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Thermal Decomposition of a New Energetic Salt of 1H,1′H-5,5′-Bistetrazole-1,1′-diol
Autorzy:
Xiao, L.
Jin, B.
Shang, Y.
Liu, Q.
Guo, Z.
Peng, R.
Powiązania:
https://bibliotekanauki.pl/articles/358377.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
1,1-dimethylbiguanidium 1H,1′H-5,5′-bistetrazole-1,1′-diolate (MGBTO)
single crystal
thermal properties
energetic properties
Opis:
1,1-Dimethylbiguanidium 1H,1′H-5,5′-bistetrazole-1,1′-diolate (MGBTO), a novel nitrogen-rich energetic salt, was synthesized by cation exchange. Its structure was characterized by elemental analysis, FTIR, NMR, DTA and TG-DTG. Single crystal X-ray diffraction analysis revealed that MGBTO was crystallized in the monoclinic space group C2/c. Thermal analysis demonstrated that its thermal stability extended up to 531.1 K. The nonisothermal kinetic and apparent thermodynamic parameters of the exothermic decomposition of MGBTO were determined by the Kissinger and Ozawa methods. Its detonation velocity and detonation pressure were calculated on the basis of the Kamlet-Jacobs equation and were 6342 m·s–1 and 15.78 GPa, respectively. The impact and friction sensitivities of MGBTO were quantified using standard BAM (10 kg drop hammer) procedures. The results revealed that the salt has good mechanical sensitivity (FS > 120 N, IS > 40 J), thus indicating its potential applications as an energetic material.
Źródło:
Central European Journal of Energetic Materials; 2018, 15, 3; 405-419
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lewis acids immobilized in ionic liquid – application for the acetal synthesis
Autorzy:
Janus, E.
Powiązania:
https://bibliotekanauki.pl/articles/778768.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
acetal formation
ionic liquid
Lewis acid
1,1-diethoxycyclohexane
Opis:
Catalytic systems composed of metal chloride (InCl3, ScCl3, YCl3, YbCl3, LaCl3, BiCl3, ZnCl3 and CuCl3) and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)-imide, [C1C4Pyrr][NTf2] as ionic liquid were prepared. Catalytic activity of all the systems were compared in acetalization reaction between cyclohexanone and triethyl orthoformate. 1,1-Diethoxycyclohexane were formed with high yield and the selectivity at 0°C within 5 minutes. Selected metal chlorides immobilized in ionic liquid were recycled 5 times without a decrease in their activities.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 3; 78-80
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of decomposition of dichloroethylenes (trans-DCE, cis-DCE, 1,1-DCE)/air under electron beam irradiation
Autorzy:
Sun, Y.
Chmielewski, G.
Bułka, S.
Zimek, Z.
Nichipor, H.
Powiązania:
https://bibliotekanauki.pl/articles/146568.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
trans-dichloroethylene
cis-dichloroethylene
1,1-dichloroethylene
electron beam
decomposition
mechanism
Opis:
On the basis of the experimental results, computer simulations of decomposition of dichloroethylenes for three isomers (trans-DCE, cis-DCE, 1,1-DCE) in air under electron beam were carried out. Computer code “Kinetic” and “Gear” method were used. Calculation results well agree with the experimental results. Decomposition efficiency of DCE is mainly determined by Cl- dissociated secondary electron attachment, followed by Cl radical addition reaction with DCE.
Źródło:
Nukleonika; 2007, 52, 2; 59-67
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The kinetics of 1,1-dichloroethene (CCl2=CH2) and trichloroethene (HClC=CCl2) decomposition in dry and humid air under the influence of electron beam
Autorzy:
Nichipor, H.
Dashouk, E.
Yacko, S.
Chmielewski, A.
Zimek, Z.
Sun, Y.
Vitale, S.
Powiązania:
https://bibliotekanauki.pl/articles/148600.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
1,1-dichloroethene
trichloroethene
electron beam decomposition
theoretical model
kinetics calculation
Opis:
New experimental data related to the removal of C2H2Cl2 and C2HCl3 in dry and humid (300 ppm of H2O) air at atmospheric pressure and a temperature of 25°C under the influence of electron beam in the dose range 1 < D < 100 kGy are published. Taking into account these experimental data, theoretical models of the decomposition of both compounds and computer simulations were performed by the present authors to find the kinetics of such processes. The influence of active atoms Cl, O and OH radicals on the VOC degradation process has been established. The theoretical model of C2H2Cl2 degradation under the influence of electron beam in dry and humid air describes the C2H2Cl2 decay and formation of the main products like Cl2, COCl2, CO, CO2, HCl, HCOCl and C2H2Cl2O. The results of calculation of the kinetics of C2H2Cl2 decomposition were compared with data obtained experimentally for the C2H2Cl2 concentration range 321-2213 ppm. It was established that the relation between the rate constants of intermediate product decomposition: C2H2Cl3O Ţ C2H2Cl2O + Cl; (k1) C2H2Cl3O Ţ COCl2 + CH2C2; (k2) should be k1/k2 = 40. The theoretical model of C2HCl3 degradation under the influence of electron beam in dry and humid air describes the C2HCl3 decay and formation of the main products like Cl2, COCl2, CO, CO2, HCl, HCOCl and C2HCl3O. A detailed comparison of experimental and theoretical data for the C2HCl3 concentration 108-3206 ppm shows that the relation between the rate constants of intermediate product decomposition: C2HCl4O Ţ C2HCl3O + Cl; (k3) C2HCl4O Ţ COCl2 + CHCl2; (k4) should be k3/k4 =10. It was also found that O2+ ions have been formed in a gas mixture as a result of charge transfer process from N2+ ions, partly in excited form, which may lead to charge transfer to C2HCl3 and degradation of those particles. According to performed calculation, it can be stated that in humid air (300 ppm of H2O) VOC degradation is occurring mainly due to a chain reaction stimulated by Cl atoms, but also OH radicals are playing an important role. In the described gas mixture, the OH radicals are formed in the following reactions: O2+) + H2O + M Ţ (O2+)H2O + M O2+ (H2O) + H2O Ţ O2 + (H3O+)OH (H3O+)OH + H2O Ţ H3O+ + OH + H2O VOC degradation process under the influence of electron beam is more effective in humid air than in dry air for the same initial VOC concentration level. This conclusion is also supported by experimental data. --------------------------------------------------------------------------------
Źródło:
Nukleonika; 2003, 48, 1; 45-50
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Structure and Energetic Properties of a Catenated N6, Polynitro Compound: 1,1’-Azobis(3,5-dinitropyrazole)
Autorzy:
Li, Y.-N.
Shu, Y.-J.
Wang, Y.-L.
Wang, B.-Z.
Zhang, S.-Y.
Bi, F.-Q.
Powiązania:
https://bibliotekanauki.pl/articles/358573.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic compound
1,1’-azobis(3,5-dinitropyrazole)
synthesis
energetic properties
Opis:
A nitrogen-rich, polynitro energetic compound with an N,N-azo linkage, 1,1’-azobis(3,5-dinitropyrazole) (ABDNP), has been synthesized by an oxidative coupling reaction of 1-amino-3,5-dinitropyrazole with different oxidizing agents. The target compound was characterized by IR spectroscopy, 1H and 13C nuclear magnetic resonance spectroscopy, elemental analysis, mass spectra, X-ray diffraction and differential scanning calorimetry (DSC). The DSC results show that 1,1’-azobis(3,5-dinitropyrazole) decomposes at a relatively high onset temperature (202.9 °C), which indicates that 1,1’-azobis(3,5-dinitropyrazole) has acceptable thermal stability. The energetic properties were obtained, with a measured density and heat of formation matched by theoretically computed values based on the B3LYP method.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 2; 321-335
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$B^q$ for parabolic measures
Autorzy:
Sweezy, Caroline
Powiązania:
https://bibliotekanauki.pl/articles/1217889.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
parabolic-type measures
Lip (1,1/2) domain
good-λ inequalities
Opis:
If Ω is a Lip(1,1//2) domain, μ a doubling measure on $∂_{p}Ω, ∂//∂t - L_{i}$, i = 0,1, are two parabolic-type operators with coefficients bounded and measurable, 2 ≤ q < ∞, then the associated measures $ω_{0}$, $ω_{1}$ have the property that $ω_{0} ∈ B^{q}(μ)$ implies $ω_{1}$ is absolutely continuous with respect to $ω_{0}$ whenever a certain Carleson-type condition holds on the difference function of the coefficients of $L_{1}$ and $L_{0}$. Also $ω_{0} ∈ B^{q}(μ) $ implies $ω_{1} ∈ B^{q}(μ)$ whenever both measures are center-doubling measures. This is B. Dahlberg's result for elliptic measures extended to parabolic-type measures on time-varying domains. The method of proof is that of Fefferman, Kenig and Pipher.
Źródło:
Studia Mathematica; 1998, 131, 2; 115-135
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The $L^p$ solvability of the Dirichlet problems for parabolic equations
Autorzy:
Tao, Xiang Xing
Powiązania:
https://bibliotekanauki.pl/articles/1206127.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
parabolic equation
$L^p$ solvability
Dirichlet problems
Lip(1,1/2) cylinder
Opis:
For two general second order parabolic equations in divergence form in Lip(1,1/2) cylinders, we give a criterion for the preservation of $L^p$ solvability of the Dirichlet problems.
Źródło:
Studia Mathematica; 2000, 139, 1; 69-80
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear optical study of 1,1-methylenedipyridinium bis[tetrachloride gold(III)] hybrid salt
Autorzy:
Zidan, M.
Al-Ktaifani, M.
Allahham, A.
Powiązania:
https://bibliotekanauki.pl/articles/1055075.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
1,1'-methylenedipyridinium bis[tetrachloride gold (III)]
organic-metallic complex z-scan technique
Opis:
The third-order nonlinear optical properties of 1,1'-methylenedipyridinium bis[tetrachloride gold(III)] were investigated by the z-scan method using CW diode laser. The experimental results led to estimation of the nonlinear optical absorption coefficient (β), the nonlinear optical refraction (n₂), and third-order nonlinear optical susceptibility (χ³). Our results show that the excited-state absorption cross-sections (σ_{ex}) is larger than the ground-state absorption cross-sections (σ_{g}), this suggests that the nonlinear optical absorption in the MPTC gold(III) is due to the reverse saturable absorption mechanism. Furthermore, the obtained results suggest that our material is considered as a promising candidate for future optical devices applications.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1379-1382
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the chain length and the functional group steric accessibility of thiols on the phase transfer efficiency of gold nanoparticles from water to toluene
Autorzy:
Soliwoda, K.
Tomaszewska, E.
Tkacz-Szczesna, B.
Rosowski, M.
Celichowski, G.
Grobelny, J.
Powiązania:
https://bibliotekanauki.pl/articles/779168.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
gold nanoparticles
phase transfer
thiols
1-decanethiol
1,1-dimethyldecanethiol
1-dodecanethiol
1-oktadecanethiol
1-tetradecanethiol
Opis:
This paper describes the influence of the chain length and the functional group steric accessibility of thiols modifiers on the phase transfer process efficiency of water synthesized gold nanoparticles (AuNPs) to toluene. The following thiols were tested: 1-decanethiol, 1,1-dimethyldecanethiol, 1-dodecanethiol, 1-tetradecanethiol and 1-oktadecanethiol. Nanoparticles (NPs) synthesized in water were precisely characterized before the phase transfer process using Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM). The optical properties of AuNPs before and after the phase transfer were studied by the UV-Vis spectroscopy. Additionally, the particle size and size distribution before and after the phase transfer of nanoparticles were investigated using Dynamic Light Scattering (DLS). It turned out that the modification of NPs surface was not effective in the case of 1,1-dimethyldecanethiol, probably because of the difficult steric accessibility of the thiol functional group to NPs surface. Consequently, the effective phase transfer of AuNPs from water to toluene did not occur. In toluene the most stable were nanoparticles modified with 1-decanethiol, 1-dodecanethiol and 1-tetradecanethiol.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 1; 86-91
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two Accounts – One Ascension: Luke 24:50-53 and Acts 1:9-11
Autorzy:
Wasiak, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2089740.pdf
Data publikacji:
2022-07-15
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
ascension
Luke 24:50-53
Acts 1:9-11
narrative analysis
Opis:
This article investigates the ascension accounts (Luke 24:50-53 and Acts 1:9-11) in a narrative way. The main analysis point will be the question: why is one event recounted twice: at the end of the first Lukan volume and the beginning of the second? The second question concerns the meaning of the discrepancies between the two pericopes. We argue that all differences can be explained by Luke’s literary and narrative strategy. Luke 24:50-53 recounts the recognition of Jesus. Acts 1:9-11 marks the end of the period (between resurrection and ascension) needed for the disciples to become the legitimate and authoritative successors of Jesus.
Źródło:
The Biblical Annals; 2022, 12, 3; 369-391
2083-2222
2451-2168
Pojawia się w:
The Biblical Annals
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Incidence Coloring of Complete Multipartite and Semicubic Bipartite Graphs
Autorzy:
Janczewski, Robert
Małafiejski, Michał
Małafiejska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/31342434.pdf
Data publikacji:
2018-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
incidence coloring
complete multipartite graphs
semicubic graphs
subcubic graphs
-completeness
L (1,1)-labelling
Opis:
In the paper, we show that the incidence chromatic number $ \chi_i $ of a complete $k$-partite graph is at most $ \Delta + 2 $ (i.e., proving the incidence coloring conjecture for these graphs) and it is equal to $ \Delta + 1 $ if and only if the smallest part has only one vertex (i.e., $ \Delta = n − 1 $). Formally, for a complete k-partite graph $ G = K_{r_1,r_2,...,r_k} $ with the size of the smallest part equal to $ r_1 \ge 1 $ we have $$ \chi_i (G)= \begin{cases} \Delta(G)+1 & \text { if } r_1=1, \\ \Delta(G)+2 & \text { if } r_1>1. \end{cases} $$ In the paper we prove that the incidence 4-coloring problem for semicubic bipartite graphs is \( \mathcal{NP} \)-complete, thus we prove also the \( \mathcal{NP} \)-completeness of L(1, 1)-labeling problem for semicubic bipartite graphs. Moreover, we observe that the incidence 4-coloring problem is \( \mathcal{NP} \)-complete for cubic graphs, which was proved in the paper [12] (in terms of generalized dominating sets).
Źródło:
Discussiones Mathematicae Graph Theory; 2018, 38, 1; 107-119
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assay of the Insensitive High Explosive FOX-7 by Non-Aqueous Titration
Autorzy:
Nandi, A. K.
Paramasivan, P.
Singh, S. K.
Mandal, A. K.
Pandey, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/358156.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
1,1-diamino-2,2-dinitroethene
FOX-7
non-aqueous titration
N,N-dimethylformamide
Opis:
A non-aqueous titration method was developed to assay the insensitive high explosive 1,1-diamino-2, 2-dinitroethene (FOX-7). The weak acidic nature of FOX-7 (pKa 10.6) was exploited in the assay method. The sample was dissolved in the protophilic solvent N, N-dimethylformamide and titrated against sodium methoxide solution in benzene/methanol using azo violet as indicator. FOX-7 samples obtained from regular batch operations were assayed by this method and the results were compared with that of a recrystallized sample. The method is simple, rapid and has good accuracy and precision.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 4; 343-352
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
1,1-Diamino-2,2-dinitroethene (DADNE, FOX-7) – Properties and Formulations (a Review)
Autorzy:
Trzciński, W.
Belaada, A.
Powiązania:
https://bibliotekanauki.pl/articles/358760.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
1,1-diamino-2,2-dinitroethene (DADNE, FOX-7)
FOX-7-based formulations
performance
sensitivity
application
Opis:
A review of the available literature on the properties of 1,1-diamino-2,2dinitroethene (DADNE, FOX-7) and formulations containing FOX-7 is presented in this paper. The structural, thermal and spectroscopic properties as well as the sensitivity and explosive properties of FOX-7 are described. Compositions containing FOX-7 are characterized in details and their sensitivity and explosive properties are presented. Potential areas of application for such formulations have been identified.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 2; 527-544
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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