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Wyświetlanie 1-15 z 143
Tytuł:
Gain scheduled controller design for thermo-optical plant
Autorzy:
Veselý, V
Osuský, J
Sekaj, I.
Powiązania:
https://bibliotekanauki.pl/articles/229643.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gain scheduled control
small gain theorem
frequency domain
genetic algorithm
control performance
Opis:
This paper presents a gain scheduled controller design for MIMO and SISO systems in the frequency domain using the genetic algorithms approach. The proposed method is derived from the M-delta structure of closed loop MIMO (SISO) systems and the small gain theory is exploited to obtain the stability condition. An example of real system illustrates the effectiveness of the proposed output feedback gain scheduled controller design method and also the possibility to improve its performance using the genetic algorithm.
Źródło:
Archives of Control Sciences; 2014, 24, 3; 333-349
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Academic and linguistic gains during a semester long study abroad: A cohort case study
Autorzy:
Cai, Wei
Li, Xiangrong
Liu, Meihua
Powiązania:
https://bibliotekanauki.pl/articles/780741.pdf
Data publikacji:
2013-12
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
gain
exchange program
academic
linguistic
Opis:
The present case study investigated university students’ academic and linguistic gains during a semester-long exchange program abroad. Thirty three third-year English majors from a Chinese university answered a battery of questionnaires and 13 of them participated in semi-structured interviews both prior to and after the program. Analyses of the data showed that the participants gained greatly from the exchange program both academically and linguistically. Based on the findings, some implications about exchange programs are discussed.
Źródło:
Studies in Second Language Learning and Teaching; 2013, 3, 4; 505-522
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Definition and Characteristics of Obligations under Unjust Enrichment
Autorzy:
Borysiak, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/1976398.pdf
Data publikacji:
2018
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
unjust enrichment
obligation
financial gain
impoverishment
Opis:
The purpose of the article is to discuss unjust enrichment as a source of obligations, already known in Roman law, which dealt with the most important problems related to the matter in question and ways to solve those problems in practice. The author, aware of the complexity of the issues related to unjust enrichment and the problems that may arise from the application of this institution, will focus on the presentation of the definition and the characteristics of unjust enrichment as a source of obligations. These characteristics are covered only in Article 405 of the Civil Code, but the apparently obvious regulation includes some unnamed elements that need to be taken into account when deciding whether unjust enrichment has actually taken place. The author intends to show that the special nature of unjust enrichment is determined first and foremost by the fulfilment of the conditions for its occurrence. These conditions include: an individual’s gain, benefiting at the expense of another person, the relationship between enrichment and impoverishment and the lack of legal grounds for enrichment; it should be added, however, that the Civil Code does not speak of the last of the listed conditions. The knowledge or the will of the enriched person will not be considered such conditions, though. The liability of the enriched person in such circumstances will occur regardless of the cause of the person’s gain.
Źródło:
Krytyka Prawa. Niezależne Studia nad Prawem; 2018, 10, 4; 70-89
2080-1084
2450-7938
Pojawia się w:
Krytyka Prawa. Niezależne Studia nad Prawem
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors affecting the precision of measurements with the usage of proportional counters
Autorzy:
Bochenek, M.
Koperny, S.
Kowalski, T. Z.
Powiązania:
https://bibliotekanauki.pl/articles/146131.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
proportional counter
gas gain
count rate effect
Opis:
In all measurements with the usage of proportional counters the pulse height and its distribution are measured. From this one can calculate energy losses and their distribution along the particle track position in 2D. The pulse height at the output of electronic circuit, co-working with the proportional counters, depends on: gas gain, energy deposited inside a counter and parameters of the readout electronics. However, it is only the first approximation. Careful studies show that output pulse height depends on the place of radiation absorption along and across the counter. The measured effect is as high as a few percent across and along the counter. Those effects were observed for both cylindrical and rectangular geometry. The pulse height depends not only on the registered count rate but also on the speed of its change. All the above effects are a few percentage effects, but can strongly affect the correctness of measurement made with the usage of proportional counters.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 29-32
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of H∞ proportional-integral thrust controller for ramjet engine
Autorzy:
Zorić, Nemanja Dušan
Radulović, Radoslav Danilo
Jazarević, Vladimir Miloš
Petrović, Trajko Borivoje
Powiązania:
https://bibliotekanauki.pl/articles/1839621.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
ramjetH∞ control
proportional-integral control
gain scheduling
Opis:
This paper presents the design of a thrust controller for a ramjet engine. The mathematical model for controller synthesis is based on a numerical solution of a set of nonlinear equations. Transfer functions of the engine are found for certain operation points defined by the altitude, Mach number and angle of attack. Local controllers are developed by using H∞ control methodology, finally reduced to proportional-integral (PI) controllers. For gain scheduling, linear interpolation of parameters of the local PI controllers is used. Next, simulations are performed in order to show performances of the presented control algorithm.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 997-1007
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected solutions in photovoltaic systems increasing their efficiency
Autorzy:
Frydrychowicz-Jastrzębska, G.
Bugała, A.
Powiązania:
https://bibliotekanauki.pl/articles/97495.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
solar cell
concentrator
PV module
power gain
Opis:
The basic objective in photovoltaics is obtaining electrical energy with the costs comparable to the costs of energy obtained from conventional fuels. The effectiveness of acquisition of electrical energy from solar cells can be improved, among other things, by using solar radiation concentrators. Photovoltaic systems with low concentration (LCPV) and high concentration (HCPV) were characterised [13]. The possibilities of their operation under various conditions were presented, whereas the impact of temperature and concentration angle were considered in particular. The most modern solutions were presented, including Spin cell, Ephocell, Interdigitated Back Contact (IBC), Luminescent Solar Concentrator (LSC), High Concentration PhotoVoltaic Thermal (HCPVT), Concentration PhotoVoltaic (CPV), Telecontrolli. Results of current Polish research were given. In the years from 1985 to 2010 the increase from 17,5 % to 40,7 % in the efficiency of solar cells with concentrators was achieved [18].
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 462-474
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of eight weeks of TRX versus traditional resistance training on physical fitness factors and extremities perimeter of non-athlete underweight females
Autorzy:
Arazi, Hamid
Malakoutinia, Fatemeh
Izadi, Mani
Powiązania:
https://bibliotekanauki.pl/articles/1031661.pdf
Data publikacji:
2018
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
functional training
strength gain
weight training
hypertrophy
Opis:
Introduction: New form of suspension training (TRX) has been introduced which has the ability to develop physical fitness factors. The aim of this study was to compare the effects of eight weeks of resistance training by traditional and TRX methods on physical fitness factors and extremities perimeter of non -athlete underweight girls. Material and methods: Thirty non -athlete underweight female students qualified with an average age of 23±1.64 years, weight of 43.53±0.28 kg, height of 162.66±6.6 cm and BMI of 16.31±0.2 kg /m 2 were selected and randomly assigned into three groups of 10 subjects (traditional, TRX and control). Participants performed training of 3 sessions per week for eight weeks. Before and after the period of training, physical fitness variables including muscular strength and endurance, flexibility, thigh and arm circumferences were measured. Results: The results showed that both forms of training had a significant effect on muscular strength and endurance. There was no significant difference in flexibility and thigh and arm circumferences. Conclusion: It can be concluded, that the traditional and TRX training have created almost same improvements in physical fitness factors, so TRX training can be considered an efficient choice to do alongside traditional training or as its alternative in order to earn desired training achievements. It is noteworthy that when training goal is to enhance muscular strength and endurance especially in upper -body, TRX training appears to be accompanied by greater gains compared to traditional resistance training.
Źródło:
Physical Activity Review; 2018, 6; 73-80
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaotic Processes In PWM Converter
Autorzy:
Zhuikov, V.
Matiiko, A.
Powiązania:
https://bibliotekanauki.pl/articles/410563.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bifurcation
feedback signal gain
precision system
converter
chaos
Opis:
The possibility of chaotic oscillations in them is determined. The structure of the chaotic oscillations in the DC converter is considered. The system stability at various gain values of the feedback signal is investigated. The task is building a precision DC buck converter. The goal is achieved by means of providing high feedback signal gain converter operation mode. The work of the converter is commended in a case of: a) changing the input voltage; b) changing the value of the load resistance. It is shown that while ensuring the appropriate converter operation mode it is possible to improve stabilising properties and reduce the system operation frequency.
Źródło:
Present Problems of Power System Control; 2016, 7; 43-51
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of heat gains components in heat balance of buildings
Autorzy:
Lis, A.
Kosicanova, D.
Powiązania:
https://bibliotekanauki.pl/articles/2068408.pdf
Data publikacji:
2009
Wydawca:
Politechnika Częstochowska
Tematy:
zysk ciepła
budynek
ogrzewanie
heating
building
heat gain
Opis:
In this paper the results of investigations on buildings heat gains components are introduced. The factors, which influence heat gains in analysed building were identified. The changes of value of these quantities on the influence of individual factors were estimated.
W artykule przedstawiono wyniki badań dotyczących zysków ciepła w budynkach. Zidentyfikowano czynniki wpływające na zyski ciepła. Oszacowano wpływ czynników na zmiany wartości zysków ciepła.
Źródło:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2009, 15 (165); 59-68
0860-7214
Pojawia się w:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Gain WAT Antenna for 38 GHz 5G Systems
Autorzy:
Przesmycki, Rafał
Bugaj, Marek
Powiązania:
https://bibliotekanauki.pl/articles/27312942.pdf
Data publikacji:
2023
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
microstrip antenna
high gain
5G wireless system
Opis:
The article presents a high gain WAT microstrip antenna designed for 5G communication systems operating in the 38 GHz band. The antenna concerned has a compact structure with dimensions of 5. 16× 5. 05 mm. Rogers RT5880 laminate with a dielectric coefficient of 2. 2 and a thickness of 0. 254 mm was used as its substrate. The antenna works at a center frequency of 38 GHz and is characterized by a low reflection coefficient of – 29 .11 dB, a high energy gain of 7. 61 dB and a wide operating band of 1 .21 GHz (3. 18%). The paper presents an analysis of the simulation results and measurements of the device’s electrical parameters and radiation patterns.
Źródło:
Journal of Telecommunications and Information Technology; 2023, 4; 76--82
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of all-optical logic XOR gate based on linear optical amplifier cross-gain modulation
Autorzy:
Li, X
Jin, J
Li, H
Zhang, Q
Powiązania:
https://bibliotekanauki.pl/articles/174514.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
linear optical amplifier
cross-gain modulation
XOR gate
Opis:
All-optical logic is the key to future high speed and large capacity optical transmission, the realization of optical packet switching and optical computing, and it has a very profound influence on the development of future optical communication. A linear optical amplifier as a new type of semiconductor optical amplifier, which has a good gain characteristic, has better signal performance than a traditional semiconductor optical amplifier in the wavelength conversion. This article presents a numerical simulation model of all-optical logic XOR gate and its logic operation based on cross-gain modulation of linear optical amplifier, and has also completed some of the basic logic operations, including AND, OR, NOT operations.
Źródło:
Optica Applicata; 2015, 45, 4; 447-457
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical gain in one-dimensional photonic band gap structures with n-i-p-i crystal layers
Autorzy:
Nefedov, I.S.
Gusyatnikov, V.N.
Marciniak, M.
Kononenko, V.K.
Ushakov, D.V.
Powiązania:
https://bibliotekanauki.pl/articles/308163.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
photonic crystals
doping superlattice
optical gain
tunable source
Opis:
The gain enhancement in a layered periodic photonic band gap structure containing active medium based on GaAs n-i-p-i superlattices separated by A1GaAs layers is analyzed. The dependences of extinction coefficient and refractive index on excitation level and wavelength are presented. Transmission characteristics of a probe light versus excitation level are calculated. It is shown that the threshold of generation can be essentially reduced if the wavelength of probe light falls to the band gap edge.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 1; 60-64
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of selected parameters of SiGe HBT transistors
Autorzy:
Zaręba, A.
Jakubowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/309306.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
heterojunction bipolar transistor
base transit time
current gain
Opis:
SiGe-base HBTs with Gaussian doping distribution are modeled including the effect of the drift field and variable Ge concentration in the base on the diffusion coefficient. Two different Ge distributions in the base are considered: a triangular one and a box one.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 3-4; 15-18
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silicon photomultiplier gain compensation algorithm in multidetector measurements
Autorzy:
Baszczyk, M.
Dorosz, P.
Głąb, S.
Kucewicz, W.
Mik, Ł.
Sapor, M.
Powiązania:
https://bibliotekanauki.pl/articles/221810.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silicon photomultiplier
single photons
gain stabilization
temperature influence
Opis:
The paper stresses the issue of strong temperature influence on the gain of a Silicon Photomultiplier (SiPM). High sensitivity of the detector to light (single photons) requires stable parameters during measurement, including gain. The paper presents a method of compensating the change of gain caused by temperature variations, by adjusting a suitable voltage bias provided by a precise power module. The methodology of the research takes in account applications with a large number of SiPMs (20 thousand), explains the challenges and presents the results of the gain stabilization algorithm.
Źródło:
Metrology and Measurement Systems; 2013, 20, 4; 655-666
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Balancedness and the Least Laplacian Eigenvalue of Some Complex Unit Gain Graphs
Autorzy:
Belardo, Francesco
Brunetti, Maurizio
Reff, Nathan
Powiązania:
https://bibliotekanauki.pl/articles/31540652.pdf
Data publikacji:
2020-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
gain graph
Laplacian eigenvalues
balanced graph
algebraic frustration
Opis:
Let \(\mathbb{T}_4 = {±1, ±i}\) be the subgroup of 4-th roots of unity inside \(\mathbb{T}\), the multiplicative group of complex units. A complex unit gain graph \(\Phi\) is a simple graph $Γ = (V(Γ) = {v_1, . . ., v_n}, E(Γ))$ equipped with a map \(\varphi:\overrightarrow{E}(Γ)→\mathbb{T}\) defined on the set of oriented edges such that \(\varphi(v_iv_j) = \varphi(v_jv_i)^{−1}\). The gain graph \(\Phi\) is said to be balanced if for every cycle $C = v_{i_1}v_{i_2} . . . v_{i_k}v_{i_1}$ we have \(\varphi(v_{i_1}v_{i_2})\varphi(v_{i_2}v_{i_3}) . . . \varphi(v_{i_k}v_{i_1}) = 1\). It is known that \(\Phi\) is balanced if and only if the least Laplacian eigenvalue \(\lambda_n(\Phi)\) is 0. Here we show that, if \(\Phi\) is unbalanced and \(\varphi(\Phi) ⊆ \mathbb{T}_4\), the eigenvalue \(\lambda_n(\Phi)\) measures how far is \(\Phi\) from being balanced. More precisely, let \(ν(\Phi)\) (respectively, \(∈(\Phi)\)) be the number of vertices (respectively, edges) to cancel in order to get a balanced gain subgraph. We show that \(\lambda_n(\Phi) ≤ ν(\Phi) ≤ ∈(\Phi)\). We also analyze the case when \(\lambda_n(\Phi) = ν(\Phi)\). In fact, we identify the structural conditions on \(\Phi\) that lead to such equality.
Źródło:
Discussiones Mathematicae Graph Theory; 2020, 40, 2; 417-433
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 143

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