Temat: constant - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Research on hybrid topology of single-switch ICPT for battery charging
Autorzy:: Zhang, Guangzong
Wang, Chunfang
Zheng, Jianfen
Li, Houji
Powiązania:: https://bibliotekanauki.pl/articles/949898.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: constant current
constant voltage
higher harmonics
ICPT
single-switch
inverter
Opis:: In order to realize constant current and constant voltage charging for batteries by inductively coupled power transfer (ICPT) technology, a single-switch CL/LCL circuit is designed. The single-switch CL/LCL circuit is composed of a CL/LCL compensation network and single-switch inverter. The proposed circuit is compared with the traditional constant current and constant voltage circuit in the structure. The operating process of the single-switch CL/LCL circuit and the principle to realize a zero-voltage switch (ZVS) are analysed in detail in this paper. The voltage gain and current gain of the circuit are calculated, which demonstrates that the circuit is able to suppress higher harmonics strongly. By using Fourier decomposition, the voltage on the primary-side compensation capacitor can be obtained. After constructing the equivalent mutual inductance model of the circuit, the formulas and parameters are deduced and calculated. Finally, an experiment platform is built to verify the proposed circuit can realize constant current and constant voltage.
Źródło:: Archives of Electrical Engineering; 2020, 69, 4; 841-855
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Balancing vectors and convex bodies
Autorzy:: Banaszczyk, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/1292627.pdf
Data publikacji:: 1993
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: balancing vectors
Steinitz constant
Opis:: Let U, V be two symmetric convex bodies in $ℝ^n$ and |U|, |V| their n-dimensional volumes. It is proved that there exist vectors $u_1,...,u_n ∈ U$ such that, for each choice of signs $ε_1,...,ε_n = ± 1$, one has $ε_1 u_1 + ... + ε_n u_n ∉ rV$ where $r = (2πe^2)^{-1/2} n^{1/2}(|U|/|V|)^{1/n}$. Hence it is deduced that if a metrizable locally convex space is not nuclear, then it contains a null sequence $(u_n)$ such that the series $∑_{n = 1}^∞ ε_n u_{π(n)}$ is divergent for any choice of signs $ε_n = ± 1$ and any permutation π of indices.
Źródło:: Studia Mathematica; 1993, 106, 1; 93-100
0039-3223
Pojawia się w:: Studia Mathematica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of frequency-controlled induction motor at higher than rated frequencies and a constant stator voltage
Autorzy:: Firago, B.
Powiązania:: https://bibliotekanauki.pl/articles/1813847.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: induction motor
frequency control
constant load torque
constant load power
rating power
Opis:: A technique for calculation of characteristics of an induction motor operating under conditions: the constant load torque or constant load power at frequencies higher than rated ones and the rated stator voltage is presented. For the mode of constant load power the analytical solution of frequency-controlled induction motor electric drive transients is obtained.
Źródło:: Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2013, 69, 33; 30--43
1733-0718
Pojawia się w:: Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Vertical Fall of a Body Under Free Motion
Autorzy:: Pluta, Z.
Hryniewicz, T.
Powiązania:: https://bibliotekanauki.pl/articles/411583.pdf
Data publikacji:: 2013
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: material body
kinetics
free fall
Path/way length
velocity
acceleration
Inertia acceleration
Gravitation acceleration
time constant
Way constant
Gravitation number constant
Opis:: The paper aims at the kinetics of a body under free fall, especially free body motion, the motion occurring in the Earth environs space, that is in the range of the gravity action. A new adequate theory of such a motion, opening new not known kinetic magnitudes, has been elaborated. This theory has its source, which is the dependence of the way length on time. That is the way characteristics created in this work. The worked out theory has been verified by experiment, referred to two different realities. One of them was the body motion in the air environment of the Earth environs space, with the second one occurring in a determined machining space-time. The adequate earth acceleration/gravity has been calculated taking advantage of the theory elaborated; and its value, as indicated, is equal 3.85 mźs-2. Two kinds of accelerations have been separated: inertial and gravitational. The relations occurring between their values on the neighbouring potential fields, unstable, and stable, have been discovered. That discovery indicates on the existence of quantum nature of gravitation.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2013, 4; 56-72
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The eigenvalue problem with conductivity boundary conditions
Autorzy:: Bucur, D.
Durus, I.
Oudet, E.
Powiązania:: https://bibliotekanauki.pl/articles/970293.pdf
Data publikacji:: 2008
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: eigenvalues
isoperimetric
constant boundary conditions
Opis:: In this paper we study isoperimetric inequalities for the eigenvalues of the Laplace operator with constant and locally constant boundary conditions. Existence and stability results are presented in the of the gamma and weak gamma convergencies, together with identification of optimal sets by analytical and numerical methods.
Źródło:: Control and Cybernetics; 2008, 37, 4; 811-829
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Dielectric studies of nano structured BaTi_1-xSn_xO₃ solid solutions
Autorzy:: Bitra, H. Ch. R.
Prasad, B. B. V. S. V.
Powiązania:: https://bibliotekanauki.pl/articles/412300.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: BTSx
XRD
SEM
dielectric constant
Opis:: BaTi_1-xSn_xO₃ (BTSx) ceramics had been prepared by temperature sintering technique. Initially, the samples were calcined at a temperature at 900 °C for 2 hours, after that ball milling was done and then the samples were sintered at a temperature of 1150 °C for 3 hours. X-ray diffractometry, Scanning Electron Microscopy, Energy Dispersive Spectroscopy and Dielectric measurements were carried out and structural, micro structural and elemental analyses were discussed in brief.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 191-201
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Packing in Orlicz sequence spaces
Autorzy:: Rao, M. M.
Ren, Z.
Powiązania:: https://bibliotekanauki.pl/articles/1218867.pdf
Data publikacji:: 1997
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: packing constant
quantitative index
interpolation
Opis:: We show how one can, in a unified way, calculate the Kottman and the packing constants of the Orlicz sequence space defined by an N-function, equipped with either the gauge or Orlicz norms. The values of these constants for a class of reflexive Orlicz sequence spaces are found, using a quantitative index of N-functions and some interpolation theorems. The exposition is essentially selfcontained.
Źródło:: Studia Mathematica; 1997, 126, 3; 235-251
0039-3223
Pojawia się w:: Studia Mathematica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Możliwość zastosowania odczynnika Fentona w procesach usuwania formaldehydu ze ścieków pochodzących z przemysłu drzewnego
Application of Fenton reagent in the process of formaldehyde removal from the timber industry wastewater
Autorzy:: Dębowski, M.
Zieliński, M.
Dudek, M.
Grala, A.
Powiązania:: https://bibliotekanauki.pl/articles/1819294.pdf
Data publikacji:: 2012
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: degradation
Fenton's reagent
constant magnetic field
Opis:: The aim of this study was to determine the possibility of degradation of formaldehyde in the effluents from the timber industry with Fenton's reagent. Effluent from the timber industry are characterized by a high concentration of organic compounds and formaldehyde as an obstacle to the purification of wastewater using microorganisms and therefore an alternative to biological methods is the use of solutions based on chemical methods. In recent years, considerable attention is given to testing and implementation of the so-called advanced oxidation methods (Advanced Oxidation Processes - AOPs). A common feature of these systems is that they allow the generation of highly reactive hydroxyl radicals OH center dot with 2,8 V oxidation potential, which react with almost all organic compounds. Fast-paced distribution of impurities, versatility and high efficiency make advanced oxidation methods are now increasingly considered as a promising alternative compared to conventional methods, techniques, wastewater and sludge treatment Wastewater used in the study came from the wood of an industrial plant where the business is the manufacture of chipboard. The study was conducted in three phases with different type of chemical reactants introduced into the technological system. In the first stage reactor was dosed only iron ions Fe3+, H2O2 in the second stage, while the third part of an experiment to test the Fenton reagent treatment was introduced Fe3+ /H2O2. Each stage is divided into five variants. The criterion for division of the variants was the dose of chemical reagents. The study confirmed the applicability of advanced oxidation technologies based on Fenton's reagent in the process of degradation of formaldehyde. It was found that the efficiency of removal of contaminants from wastewater was directly connected with the dose of chemical reagents introduced into the technological system. It was also noted that increasing the dose above the Fenton reagent Fe3+ 0,3 g /l and 3,0 g H2O2/l does not significantly affect the final results of the purification process. The highest results were obtained in the technology used in doses of 0,3 g Fe 3+/l and 3,0 g H2O2 /l to 0,6 g Fe3+/l and 6,0 g H2O2/l. Limiting values of COD in the experimental variants was approximately 70,0% while the concentration of formaldehyde close to 60,0%. If dispensing the water only Fe3+ ions obtained the highest efficiency and reduce the COD concentration of formaldehyde was 28,3% sequentially and 14,5%. The final concentrations of the analyzed indicators of pollution, if only H2O2 dosing were similar to their concentrations in raw wastewater.
Źródło:: Rocznik Ochrona Środowiska; 2012, Tom 14; 587-596
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Reliability Design of Complex Systems by Minimizing the Lifetime Variance
Autorzy:: Łobos, E.
Momot, M.
Powiązania:: https://bibliotekanauki.pl/articles/908509.pdf
Data publikacji:: 2002
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: matematyka
reliability
constant failure rate
redundancy
Opis:: The problem considered in this paper is the minimization of the lifetime variance of a complex system subject to its expected life and economic constraints. The example of a bridge network, in which all elements have constant failure rates, illustrates the problem. A numerical algorithm for solving this optimization problem by using exact formulae for system lifetime moments is included. Using this algorithm, we can obtain results better than the solutions known from earlier papers.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2002, 12, 4; 553-557
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Analysis of dynamic properties of flat plate and heat pipe solar collectors
Autorzy:: Obstawski, P.
Bakoń, T.
Tulej, M.
Powiązania:: https://bibliotekanauki.pl/articles/114238.pdf
Data publikacji:: 2016
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: solar collector
step response
time constant
Opis:: The paper presents an analysis of dynamic properties of two flat plate solar collectors differing in the design of coil and vacuum tube liquid-vapour (heat-pipe) collector. The collector identification experiment was carried out under field conditions based on the methodology described in PN-EN ISO 9806: 2014-2 standard. The results of the field experiment were compared with those obtained under laboratory conditions.
Źródło:: Measurement Automation Monitoring; 2016, 62, 3; 105-108
2450-2855
Pojawia się w:: Measurement Automation Monitoring
Dostawca treści:: Biblioteka Nauki

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