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Wyświetlanie 1-15 z 43
Tytuł:
A dual inductor-fed boost converter with an auxiliary transformer and voltage doubler
Autorzy:
Dawidziuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/201526.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DC/DC boost converter
current-fed
dual inductor-fed
auxiliary transformer
voltage doubler
photovoltaic systems
Opis:
This paper presents a dual inductor-fed boost converter with an auxiliary transformer and voltage doubler for sustainable energy power converters. The new topology integrates a two-phase boost converter and a dual inductor-fed boost converter. The energy stored and transferred by both inductors can attain a wide input-voltage and load range which uses a constant switching frequency, by controlling the time duration of the simultaneous conduction of the two switches. Among other current-fed type boost converters the presented topology is attractive due to the high voltage conversion ratio, less stress on the components and less switch conduction loss. To verify the feasibility of this topology, the principles of operation, theoretical analysis, and experimental waveforms are presented for a 1 kW prototype.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 787-791
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The validity and time-horizon of the Fed model for equity valuation: a co-integration approach
Autorzy:
Mercier, Fabien
Powiązania:
https://bibliotekanauki.pl/articles/565654.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
arbitrage
stock
earning yields
Fed model
Opis:
Investors do arbitrage between bonds and stocks. The so-called “Fed model” asserts that comparing the level of the earnings yields of stocks to the nominal government bond yields is relevant when assessing the relative values of the two asset classes, and their prospective returns. A conceptual problem with this model is that it compares a real quantity, the earning yield, to a nominal one, the government bond yield, thus implying that economic agents suffer from money-illusion. The merits of the Fed model as an indicator of stock returns is still very controversial. In this article we try to quantify the scope of the Fed model by employing appropriate techniques of co-integration to validate, or invalidate, the Fed model. More precisely, we study the validity of the model geographically and using different frequencies in order to determine its potential time horizon. We obtain the following results. First, the Fed model is very limited in scope and in time: of the 21 pairs of countries and stock exchange indices tested, only three are potential candidates for the Fed model: the US, Italy and Mexico; in the US, the Standard and Poor’s 500 confirms the model, but only from 1980 to 2000. Second, for the Standard and Poor’s 500 from 1980 to 2000 the validity of the Fed model is confirmed, for a time horizon of one week or more for predicting the earning yield on stocks and a time horizon of one month or more for the nominal yield on bonds. Third, from 2000 onwards the long-term relationship between earning yields and nominal bond yields becomes inverted, and the Fed long-term relationship does not help predict any of the two variables compared to a simple vector autoregressive model (VAR). Overall, the evidence for the relevance of a linear long-term relationship between nominal US bonds yields level and the earnings ratio of broad stock indexes appears very weak, even when this relationship is allowed to vary over time, with a structural break somewhere in 2000 with an inversion of the relationship. In most cases, assuming and estimating a possible long-term relationship between earning yields and nominal bond yields does not improve the forecasts as short-term dynamics dominate.
Źródło:
Journal of Banking and Financial Economics; 2015, 1(3); 24-49
2353-6845
Pojawia się w:
Journal of Banking and Financial Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intensyfikacja biosyntezy lowastatyny przy użyciu laktozy i glicerolu jako źródeł węgla w procesach okresowych oraz discontinuous fed-batch i continuous fed-batch
Intensification of lovastatin biosynthesis with the use of lactose and glycerol as carbon sources in a batch and in discontinuous fed-batch and continuous fed-batch culture
Autorzy:
Pawlak, M.
Bizukojć, M.
Powiązania:
https://bibliotekanauki.pl/articles/2071651.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Aspergillus terreus ATCC 20542
lowastatyna
hodowla okresowa
hodowla fed-batch
lovastatin
batch culture
fed-batch culture
Opis:
W pracy została przedstawiona strategia maksymalizacji biosyntezy lowastatyny przez Aspergillus terreus ATCC 20542 przy jednoczesnym użyciu laktozy i glicerolu jako źródeł węgla w procesach okresowych jak i półciągłych. Zarówno w bioreaktorze jak i w hodowlach wstrząsanych lepsze wyniki uzyskiwano w procesach fed-batch. W bioreaktorze niezbędna była controla pH i p02 oraz zmienna szybkość zasilania substratem węglowym, która intensyfikowała wydzielanie lowastatyny.
The strategy of maximization of lovastatin biosynthesis by Aspergilus terrreus ATCC 20542 with the simultaneous use of lactose and glycerol as carbon sources in a batch and fed-batch culture is presented in the paper. Both in shake flasks and in a bioreactor better results were obtained in the fed-batch culture. In the bioreactor it was also necessary to control pH and p02 and to vary feeding rate of carbon substrate. All of them intensified lovastatin secretion.
Źródło:
Inżynieria i Aparatura Chemiczna; 2012, 4; 164-166
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Panika roku 1907 – kryzys finansowy 2008. Sto lat budowania kreatywnego kapitalizmu
The panic in 1907 – the financial crisis in 2008. One hundred years of creative capitalism building
Autorzy:
Kwaśnicki, Witold
Powiązania:
https://bibliotekanauki.pl/articles/570118.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
financial crisis
FED
central bank
crony capitalism
political capitalism
Opis:
Usually, current financial crisis of 2008 is compared to the Great Depression of 1929. But there are some evidence that our current financial crisis has much more similarities and analogies to the crisis initiated by the panic in 1907. A brief analysis of both crises is presented. This analysis is conducted on the basis of the history of the United States of America, where both mentioned crises were initiated. However, we will search for the answer to the basic question, namely: how events in the early twentieth century shaped the history of the economies in the next hundred years, and how expected changes in the institutional arrangements after 2008 may be comparable to the revolutionary changes of the social order after 1907 (e.g., appearance of the FEDeral Reserve System in 1913, the adoption of the 16th Amendment of the U.S. Constitution, enabling the collection of taxes on personal income, growth and omnipotence of government agencies)?
Źródło:
Ekonomia XXI Wieku; 2014, 2(2); 9-33
2353-8929
Pojawia się w:
Ekonomia XXI Wieku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contactless multipolar double-fed asynchronous generator for windmills
Autorzy:
Levin, M.
Pugachov, V.
Ribickis, L.
Zhiravetska, A.
Powiązania:
https://bibliotekanauki.pl/articles/262719.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
doubly-fed
multipole
asynchronous generator
contactless
teeth-zone
module
Opis:
A multipolar contactless doubly-fed asynchronous generator is considered where the primary and secondary generation windings are arranged on the teeth of the stator, while the rotor is tooth-like and without windings. Analytical treatment of such a generator has been performed and the basic equations that allow the parameters and performance of the machine to be calculated in generation mode of operation have been obtained. The results of experimental investigations are presented for the physical model of the generator and comparison with the calculation data is given.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 53-57
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
“Bottomsets” of the lava−fed delta of James Ross Island Volcanic Group, Ulu Peninsula, James Ross Island, Antarctica
Autorzy:
Nehyba, Slavomír
Nývlt, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/2049758.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
James Ross Island
lava−fed delta
lithofacies
Pliocene
Źródło:
Polish Polar Research; 2015, 1; 1-24
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation
Autorzy:
Nahlaoui, M. Al
Steins, H.
Kulig, S.
Exnowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/140646.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inverter-fed
induction motor
asynchronous machine
acoustic radiation
modal analysis
Opis:
In this paper a comparison of numerically determined and measured electromagnetically exited noise of an induction motor is presented. The calculations are accomplished using FEM for an example motor, which is a 290 kW inverter-fed asynchronous machine. The approach starts with the electromagnetic and mechanical consideration. The focus is set on acoustic considerations, which contain the 3D-FE-model and measurement setup in the sound chamber.
Źródło:
Archives of Electrical Engineering; 2013, 62, 2; 195-207
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experience in the development and operation of asynchronized turbogenerators and condensers in the Russian Power System
Autorzy:
Shakaryan, Y.
Sokur, P.
Powiązania:
https://bibliotekanauki.pl/articles/950651.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asynchronized machine
condenser
doubly-fed machine
reactive power
vector control
Opis:
Asynchronized (doubly-fed) machines with two (three) excitating winding and reversing excitation system allow to control vector of magnetomotive force. This solution allows separating regulation of the electromagnetic torque (active power) and voltage (reactive power). This paper describes the experience in the development and operation of asynchronized turbogenerators and condensers.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 7-15
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of a doubly fed induction generator at grid voltage imbalance
Autorzy:
Łuszczyk, T.
Iwański, G.
Powiązania:
https://bibliotekanauki.pl/articles/1193415.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
doubly fed induction generator
power control
torque control
unbalanced grid
Opis:
Properties and control of a doubly fed induction machine operating under unbalanced grid voltage conditions have been presented. The proposed method does not include symmetrical sequences decomposition and is realized in a rotating frame not synchronized either with the grid voltage vector or with the stator flux vector. The method uses a reference torque and the reference q component of instantaneous power for calculation of the reference stator current. Next, calculation of magnetizing current for a given unbalanced grid voltage is used to assign the reference rotor current. Due to the fact that the reference current contains both a positive and a negative sequence, a proportional-integral-resonant controller is used. The main control target is the non-oscillatory waveform of torque, whereas other separate strategies like symmetrical stator current or sinusoidal rotor current can be easily obtained by adequate filtration of the reference control signals of the stator or rotor currents, respectively. The simulation results of the 2 MW model have been presented for a doubly fed induction generator as well as the results of laboratory tests with the use of a small scale 7.5 kW machine.
Źródło:
Power Electronics and Drives; 2017, 2, 37/2; 31-48
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Suitability of surface water for irrigation in the Maffragh basin, North-East of Algeria
Autorzy:
Boubguira, Selwa
Zouini, Derradji
Lamine, Sayad
Dali, Nawel
Powiązania:
https://bibliotekanauki.pl/articles/1844368.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
irrigation
Maffragh basin
northeastern Algeria
rain-fed agriculture
surface water
Opis:
Water quality is an environmental priority for irrigation in rainfed agriculture. Recently, water quality has been affected by the uncontrolled disposal of wastewater, the use of chemical fertilizers in agriculture and, most significantly, by the excessive exploitation of water resources during the low season. The basin of the Maffragh in the Algerian north-east real is fed by two main rivers: Wadi El Kebir East and Bounnamoussa. From its source, the stream is continually contaminated with domestic and agricultural discharges through the tributaries causing a significant deterioration in water quality. In order to know the current state of water quality in the Maffragh basin and to determine its suitability for irrigation without any prior treatment, research has been conducted in the two streams at representative sampling points in catchment areas used for irrigating crops. To assess the quality of water and detectable compounds monitoring, laboratory methods are used. The various volumetric and colorimetric assays were carried out according to Jean Rodier. Organic parameters such as nitrites, ammonium and phosphates, were measured using a UV/VIS 6705 JENWAY spectrophotometer, at wavelengths of 543 nm, 630 nm and 880 nm respectively for nitrites, ammonium and phosphates. The BOD5 and COD parameter was measured using a DIN EN 1899-1-H51 spectrophotometer and DIN ISO15705: 2002 spectrophotometer. The performed analyses on conductivity shows oscillating values ranging between 425 and 495 μS∙cm–1 for January 2018, while for the low water level of July 2018 the conductivity varies between 433 and 796 μS∙cm–1; this parameter is determinant for water quality assessment and its use for irrigation. Beside the conductivity test, the Riverside–Wilcox diagram was applied, to combine conductivity and sodium absorption rate (SAR). The obtained results of the two seasons show satisfactory results in the applicability of the water to irrigate in the basin.
Źródło:
Journal of Water and Land Development; 2021, 48; 94-98
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Model of the Electric Drive with Double-Fed Asynchronous Machine and Direct Torque Control
Autorzy:
German-Galking, S.
Kozak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2064935.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
control flux and torque
double-fed asynchronous machine
package Matlab–Simulink
Opis:
At present, the development of modern complex objects management systems, including electric motors, must include the step of modelling studies, which allows you to obtain basic characteristics, slightly different from the real characteristics of the object. The development of an adequate model, which can simulate the system under investigation, eliminates the stage of conceptual design and significantly reduce the engineering design stage, and therefore saves time and money.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 41--45
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ewolucja celu władzy monetarnej. Przypadek Rezerwy Federalnej Stanów Zjednoczonych
Evolution of Monetary Policy Objective. US Federal Reserve Case
Autorzy:
Ząbkowicz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/500370.pdf
Data publikacji:
2010
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
FED
ceny aktywów finansowych
wzrost gospodarczy
financial assets prices
economic growth
Opis:
Analiza przypadku Rezerwy Federalnej Stanów Zjednoczonych stwarza historyczny kontekst dla faktów, które spowodowały narastanie międzynarodowego kryzysu finansowego w drugiej połowie obecnej dekady. Zarazem z przykładu Fedu można wyciągnąć wnioski dla polityki stabilnego pieniądza. Wydaje się, że im większa rola rynków finansowych w gospodarce, tym wyraźniej ujawnia się związek między kondycją bankowości komercyjnej oraz koniunkturą na rynkach akcji i – jak pokazuje współczesny boom i załamanie na rynku pożyczek hipotecznych – także na rynku nieruchomości. Wydaje się także, iż w polityce amerykańskiego banku centralnego od bez mała dwudziestu lat faktycznie chodzi nie tyle o ograniczanie inflacji, ani nawet - stabilizację rynków finansowych, co o podtrzymywanie wzrostu gospodarczego.
The analysis of the US Federal Reserve case provides a historical context for facts caused unfolding financial crisis in the second half of current decade. The example of Fed also gives conclusions for the policy of stable currency. It appears that the more significant the role of financial markets in economy is, the more apparent the relation between the shape of commercial banking and stock market situation is. Moreover, as proved by the current boom and bust in mortgage market, the relation concerns real estate market as well. However, it seems that the policy of the US Central Bank pursued for almost the past twenty years has been targeted not at curbing inflation, neither at financial markets stability, but at sustaining the economic growth.
Źródło:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2010, 83: Polityka gospodarcza: wyzwania, dylematy, priorytety; 99-124
0866-9503
Pojawia się w:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and performance analysis of a novel multiphase doubly-fed induction generator
Autorzy:
Ryndzionek, Roland
Blecharz, Krzysztof
Kutt, Filip
Michna, Michał
Kostro, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2172803.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
doubly-fed induction generator
induction generator
multiphase machine
wind power generation
Opis:
This paper presents the research into the design and performance analysis of a novel five-phase doubly-fed induction generator (DFIG). The designed DFIG is developed based on standard induction motor components and equipped with a five-phase rotor winding supplied from the five-phase inverter. This approach allows the machine to be both efficient and reliable due to the ability of the five-phase rotor winding to operate during single or dual-phase failure. The paper presents the newly designed DFIG validation and verification based on the finite element analysis (FEA) and laboratory tests.
Źródło:
Archives of Electrical Engineering; 2022, 71, 4; 1003--1015
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State observer for doubly-fed induction generator
Autorzy:
Blecharz, K.
Wachowiak, D.
Krzemiński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1193442.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
doubly-fed induction generator
non-linear control
state observer
power control
Opis:
The purpose of this paper is to show a new state observer for doubly-fed generator. A proposed z-type observer algorithm based on mathematical model of doubly fed generator with additional variables treated as a disturbances has been used. A nonlinear multiscalar control method has been proposed to control active and reactive power of the generator. All analyses were verified by simulations and experiments tests.
Źródło:
Power Electronics and Drives; 2017, 2, 37/2; 61-75
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Origin and Neoholocene evolution of spring-fed fens in Wardzyń, Łódź Upland, central Poland
Autorzy:
Dobrowolski, R.
Ziułkiewicz, M.
Okupny, D.
Forysiak, J.
Bałaga, K.
Alexandrowicz, W. P.
Buczek, A.
Hałas, S.
Powiązania:
https://bibliotekanauki.pl/articles/2060368.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
spring-fed fen
calcareous tufa
peatland
Neoholocene
Łódź Upland
Central Poland
Opis:
Spring-fed fens in Wardzyń represent the rare group of alkaline mires supplied by artesian groundwater. Using multidisciplinary methods (including sedimentological, hydrometric and hydrochemical, pollen, macrofossil, malacological, geochemical, radiocarbon dating, and stable oxygen and carbon isotope analyses) we have been able to (1) reconstruct the main phases of spring-fed fen development, and to (2) determine the cause of Neoholocene groundwater ascension responsible for the mire inception. These phases are characterized by cyclic organic (peat) and carbonate (tufa) sedimentation associated with the Holocene fluctuations in humidity and temperature. The beginning of the activation of hydrological systems (involving the flow of confined groundwater of the Cretaceous aquifer) at Wardzyń occurred in the Subboreal period of the Holocene, after a long episode of decreased humidity initiated ca. 4.2 ka cal BP.
Źródło:
Geological Quarterly; 2017, 61, 2; 413--434
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
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