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Tytuł:
The effect of dynamic balance exercises on certain kinematic variables and jump shoot accuracy among female basketball players
Autorzy:
Alhawary, Ranya
Powiązania:
https://bibliotekanauki.pl/articles/1902562.pdf
Data publikacji:
2020-03-30
Wydawca:
Politechnika Opolska. Wydział Wychowania Fizycznego i Fizjoterapii
Tematy:
dynamic balance
motion analysis
jump shoot
accuracy
basketball
Opis:
The aim of the research is to identify the impact of dynamic balance exercises on certain Kinematic Variables andJump Shoot Accuracy among Female Basketball Players. Researchers used the experimental method for one groupwith pre - post Tests. The research sample was intentionally selected for Female Basketball Players under the ageof 16 at the Beni Suef club registered in the Egyptian Basketball Federation for the 2019 sports season andtotalling ten (10) players who were filmed during the Jump Shoot after dribbling to recognize certain KinematicVariables that affect shooting accuracy. Researchers conducted tests of front and lateral balance using a (MFT)device, Hexagon Test, Vertical jump from motion and skill tests to measure the accuracy and speed of the shoot.The implementation of the training program was conducted for eight weeks - five units per week; the time of eachunit was 120 minutes, including 40 min. devoted to balance exercises. The main findings showed improvementin the results of balance tests using the (MFT)device, Hexagon, vertical jump from motion, and improvement inthe motion path of the centre of gravity for the horizontal and vertical paths. It also showed benefits for thehorizontal displacement transfer of Momentum to vertical motion energy which enabled the player to reach thehighest point, and improvement of shooting angles which is considered the main factor in giving the ball theright trajectory in order to enter the ring to improve the ratio of the jump shoot. Researchers recommended thenecessity of using dynamic balance exercises within Female training programs.
Źródło:
Journal of Physical Education & Health - Social Perspective; 2019, 8, 14; 41-48
2084-7971
Pojawia się w:
Journal of Physical Education & Health - Social Perspective
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SHORT-TERM FISCAL IMBALANCE COMPARISON IN V4 COUNTRIES USING A DYNAMIC CONDITIONAL CORRELATION APPROACH
Autorzy:
Drab, Radovan
Martinkova, Slavomira
Mihokova, Lucia
Powiązania:
https://bibliotekanauki.pl/articles/517421.pdf
Data publikacji:
2017
Wydawca:
Instytut Badań Gospodarczych
Tematy:
primary balance
dynamic conditional correlation approach
V4 countries
consolidation policy
role of government
Opis:
Research background: The crisis periods have highlighted the interdependence between individual European economies in the area of economic and fiscal development. The common development tendencies raise the question whether the fiscal indebtedness and preferred fiscal policy of V4 countries can be considered as interdepending. Considering this assumption, a possibility for implementing a similar type of consolidation in selected clusters of countries could be proposed. Purpose of the article: The research is, from the empirical point of view, focused on the analysis and comparison of primary balance indicator, analysis and assessment of fiscal measures (in identified fiscal episodes) and analysis of fiscal development intercorrelations using the dynamic conditional correlation approach. Methods: The empirical assessment of the research objective is, from the methodological point of view, divided into five phases: (1) the calculation of primary deficit indicator, (2) the analysis, comparison and assessment of the fiscal development in the V4 countries based on the annual primary deficit during the selected period 1999–2016, (3) the seasonal adjustment of performing time series and non-stationarity testing, (4) the dynamic conditional correlation approach (DCC) application. Within the analysis, the traditional and specific methods were used (time series analysis, content analysis, descriptive statistics, correlation methods, DCC approach). Findings & Value added: The results of the research suggest that between V4 countries do exist significant differences based on which cannot be clearly confirmed the assumption about the fiscal development interdependence in V4 countries. From the long-term perspective, it can be stated that the fiscal development in V4 countries is a very slightly positively related aspect, but in the context of the implementation of a common consolidation strategy it is not sufficient.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2017, 12, 2; 261-280
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Different Exercise Intensities on the Static and Dynamic Balance of Older Adults: A randomised Controlled Trial
Autorzy:
Ghasemabad, Kamran
Kamalden, Tengku
Dev, Roxana
Gasibat, Qais
Nekooei, Pooya
Majlesi, Sara
Nekouei, Paria
Alemi, Behzad
Powiązania:
https://bibliotekanauki.pl/articles/2148827.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
elderly
resistance training
high-intensity training
moderate-intensity training
low-intensity training
static balance
dynamic balance
Opis:
This study aims to find the effectiveness of different exercise intensities (high-, moderate-, and low-intensity) on the dynamic and static balance of elderly women. A single-blinded factorial design study was conducted in healthy older adults (>65 years) in 12 weeks. The authors have assessed the Forward Reach Test (FRT), Lateral Reach Test (LRT), One Leg Stand (OLS), Tandem Stand Test (TST) in 60 healthy older women at a gym centre, Fit House located in Bukit Rimau, Kuala Lumpur, Malaysia. Participants were randomly assigned to a High-Intensity Training (HIT) group; (n=15) (Mean age 69.60 ± 3.68) who performed four exercises [Leg Press (LP), Leg Extension (LE), Leg Curl (LC), and Calf Raises (CR)] at 80 to 90% of One-Repetition Maximum (1RM); Moderate-Intensity Training (MIT) group (n=15) (Mean age 69.27 ± 3.41) performed at 65 to 75% of 1RM; Low- Intensity Training (LIT) group (n=15) (Mean age 69.27 ± 1.94) performed at 50 to 60% of 1 RM; and a Control Group (CG) (n = 15) (Mean age 68.67 ± 2.38) with no training. Data was collected at pre-test, 4th, 8th, and 12th weeks of intervention. 60 participants were analysed and the main effect of time showed a statistically significant difference in the mean of all variables (all p < 0.001), and also there was a statistically significant interaction between intervention and time on all variables (all p < 0.001). Different levels of intensity on only the lower extremities muscles had a significant effect on the dynamic balance and static balance of the elderly population. After four weeks of training HIT, MIT, and LIT illustrated significant improvement in dynamic balance, as well as static balance.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2022, 39; 49-64
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Balance of the Magneto-Hydro-Dynamic Pump for Recovery of Platinum Group Metals from Spent Auto Catalysts
Autorzy:
Gil, S.
Bialik, W.
Saternus, M.
Fornalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/356349.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal balance
magneto-hydro-dynamic pump
platinum group metals
Opis:
Every new car should be equipped with the catalyst, which limits the amount of harmful chemical compounds such as NOx, CH and CO emitted to the air. Auto catalyst consists of the ceramic or metallic carrier, on which is the layer with Platinum Group Metals playing catalytic role. There are many methods using for recovery those valuable metals from spent auto catalyst, however evry of those methods have some limitations. Proces described in the article is the modified method of metal collector, which used magnetohydrodynamic pump. Rotary electromagnetic field generates in the liquid metal rotary current, which as a consequence washing out the PGM metals from the ceramic carriers. Considering the possibilities of commercialization of the described method, the energy balance was made. From that balance the energetic efficiency of the unit was determined and the analysis of the temperature distribution was shown thermographycally.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 253-256
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena równowagi dynamicznej kobiet po mastektomii jednostronnej i protezowaniu zewnętrznym piersi –badania pilotażowe
Evaluation of the dynamic balance in women after unilateral mastectomy and external breast prosthesis – a pilot study
Autorzy:
Karczewska, E.
Szlachta, P.
Chamera, S.
Latosiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/99069.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
równowaga dynamiczna
mastektomia
proteza piersi
dynamic balance
mastectomy
breast prosthesis
Opis:
Celem pracy było określenie, czy protezowanie zewnętrzne w postaci wkładek silikonowych do biustonosza wpływa na równowagę dynamiczną kobiet po mastektomii jednostronnej. Grupę badaną stanowiło 30 kobiet po jednostronnej mastektomii całkowitej w wieku od 40 do 73 lat (średnio: 57,5±8,4), średni czas od zabiegu operacyjnego wynosił 6,5±5,0 lat. Do zbadania równowagi dynamicznej posłużono się platformą balansową „Libra” firmy Easytech. Wyniki: Z przeprowadzonych badań wynika, że bez względu na czas, jaki upłynął od mastektomii, noszenie protezy piersi nie ma wpływu na równowagę dynamiczną kobiet po tym zabiegu, podczas gdy wiek pacjentek oraz ograniczenie ruchomości obręczy barkowej mają istotne znaczenie dla reakcji równoważnych.
The aim of the study was to determine whether external prosthesis in the form of bra silicone inserts affects the dynamic balance in women after unilateral mastectomy. The study group was 30 women after unilateral mastectomy, in age between 40-73 years (average age was 57,5±8,4), average time from operation was 6,5±5,0 y. To explore the dynamic balance, the balance platform „Libra” (Easytech) was used. Results: the study showed that the period of wearing of the prosthesis had no impact on dynamic balance in women after mastectomy, whereas patients` age and limited mobility of the shoulder girdle was of considerable significance to balance responses.
Źródło:
Aktualne Problemy Biomechaniki; 2017, 13; 29-36
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie obciążalności prądowej przewodów napowietrznych linii elektroenergetycznych
Modeling ampacity of the conductors of the overhead power lines
Autorzy:
Kmak, J.
Nowak, W.
Szpyra, W.
Tarko, R.
Powiązania:
https://bibliotekanauki.pl/articles/268435.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
napowietrzne linie elektroenergetyczne
obciążalność dynamiczna linii
metoda elementów skończonych
dynamic thermal rating
heat balance equation
numerical model of conductor
Opis:
Wzrost zapotrzebowania na energię elektryczną wymusza konieczność modernizacji istniejących oraz budowanie nowych sieci elektroenergetycznych. Alternatywne rozwiązanie stanowi zastosowanie w istniejących sieciach systemów dynamicznej obciążalności. Dopuszczalny prąd jest w tych rozwiązaniach dostosowywany do panujących warunków zewnętrznych. Określenie obciążalności przewodu wymaga przeprowadzenia złożonych obliczeń z wykorzystaniem modeli matematycznych. W artykule przeanalizowano trzy przykładowe modele. Pierwszy oparty jest na bilansie cieplnym. Kolejne dwa modele wykorzystują obliczenia numeryczne w programie ANSYS i różnią się stopniem złożoności odwzorowania geometrii przewodu.
As a result of growth in demand for electricity changes in power systems are required. Modernization of existing power lines and building new ones is essential. The alternative is application of dynamic thermal rating systems. Permissible current in this case is adjusted to actual atmospheric conditions. For determining ampacity in this way complex calculations are required. Mathematical modeling is used. In framework of the article three different models are considered. The first one is based on heat balance equation. In others two variants numerical calculations in ANSYS are applied. The difference between them is in complexity of geometry models. The most satisfactory results are obtained for numerical calculations and accurate geometry of conductor.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 57; 47-50
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static and dynamics of a pump impeller with a balancing device. Part II: dynamic analysis
Autorzy:
Martsinkovsky, V. A.
Zhulyov, A.
Kundera, C.
Powiązania:
https://bibliotekanauki.pl/articles/955212.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pompa wirowa
wirnik
analiza dynamiczna
dynamic analysis
pump impeller
balance device
stability condition
Opis:
This paper presents the theoretical study of the system comprising an impeller and a balancing device. It deals with the dynamic analysis of the system, i.e., the axial vibrations of the impeller, and the system stability. The dynamic analysis took into account linearized hydrodynamic forces and moments generated in the longitudinal clearances of the seals of the impeller. The theoretical analysis was supplemented with a numerical example with characteristics determined for a real single-stage centrifugal pump.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 3; 621-631
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of rotary piston engine use in transport power plants
Autorzy:
Mytrofanov, Oleksandr
Proskurin, Arkadii
Poznanskyi, Andrii
Powiązania:
https://bibliotekanauki.pl/articles/2203852.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
rotary piston air engine
hybrid transport power plant
compressed air
external speed characteristics
car power balance
dynamic characteristic of a car
silnik powietrzny z tłokiem obrotowym
sprężone powietrze
charakterystyka prędkości zewnętrznej
bilans mocy samochodu
charakterystyka dynamiczna samochodu
Opis:
A schematic diagram of a transport hybrid power plant using a new design RPE-4.4/1.75 rotary piston air engine is proposed. Its external speed characteristic is determined, according to which the maximum engine power is 8.75 kW at 850 rpm and the maximum torque is 127.54 N∙m at 400 rpm. For various gears and speeds, all the components of the power balance were determined and the dynamic characteristic of the hybrid car was obtained when operated on an air engine. According to the dependences of the power balance, the total traction force from the rotary piston air engine on the driving wheels is 5 kN. The performance of acceleration of a hybrid car while working on an air engine is estimated, namely, the dependences of acceleration, time, and acceleration path are obtained. In urban traffic, the required time to accelerate the car to a speed of 60 km/h is 15.2 s and the path is 173 m. The possible drive range of the hybrid car on compressed air without additional recharging is analyzed. On one cylinder with compressed air with a volume of 100 liters, an initial pressure of 35 MPa, and a final pressure of 2 MPa, the hybrid car can travel about 26 km.
Źródło:
Transport Problems; 2021, 16, 1; 165--178
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simulation model of energy distribution in ship combustion engine
Autorzy:
Nguyen, H.
Powiązania:
https://bibliotekanauki.pl/articles/259168.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
computer simulation
ship diesel engine
dynamic processes
energy balance and distribution
Opis:
In the paper a model of energy flow and distribution in ship diesel engine cylinder was presented. This is a model of discrete parameters, being a continuation of the author s research on simulation of energy processing within ship main propulsion engine [2,3]. The model in question makes it possible to calculate energy flow values delivered and transferred during every working cycle of the engine cylinder. Results of application of the model for 6ZA40S Sulzer engine installed on B672 ship were also attached. The results were compared with results of test-stand measurements of the engine, performed at different load levels.
Źródło:
Polish Maritime Research; 2005, 1; 22-26
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development of postural control in 6–17 old years healthy children. Part I Postural control evaluation in modified Clinical Test for The Sensory Interaction on Balance in 6–17 old year children (mctsib)
Autorzy:
Orendorz-Frączkowska, Krystyna
Kubacka, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/1397293.pdf
Data publikacji:
2020
Wydawca:
Index Copernicus International
Tematy:
balance maturation
balance system in children
posturography
static and dynamic balance
vestibulospinal reflexes
Opis:
Introduction: Proper development of postural control in children is connected with the maturation of the central nervous system, development of sensory organisation with appropriate use of proprioceptive, visual, vestibular information as well as reactions and postural strategy which allow the maintenance of balance in changeable environmental conditions. Developmental disturbances in this particular area is reflected in postural disfunctions and the assessment of these disfunctions and disturbances needs referring to normative values of the healthy population of children. Aim: Examination of postural control development in children aged 6–17 years. Material: 127 healthy children were tested (65 girls and 62 boys) aged 6–17 years. Method: Laryngological investigation, medical history interview, audiometry and tympanometry were conducted in all children. In the evaluation of postural control (mCTSIB-modified Clinical Test For The Sensory Interaction On Balance) a computer posturography system was used (Balance Master Neurocom). R esults: Further development of postural control was found in healthy children up to the age of 13 years of age. The development was not linear but showed transient characteristics with a faster development stage between the age of 6–7 and 8–9. Better postural control in girls, particularly the youngest, in comparison with boys was noticed. C onclusions: 1. The values of norm postural control in posturographic test mCTSIB in children aged 6–17 was established. In this test postural control development was completed in children before 13 year and it was not linear. 2. Due to gender differences it seems appropriate to use separate norms in order to evaluate the development of postural control in boys and girls.
Źródło:
Polish Journal of Otolaryngology; 2020, 74, 1; 29-35
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development of postural control in 6–17 old years healthy children. Part II Postural control evaluation – Limits of Stability Test (LOS) in 6–17 old year children
Autorzy:
Orendorz-Frączkowska, Krystyna
Kubacka, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/1397378.pdf
Data publikacji:
2020
Wydawca:
Index Copernicus International
Tematy:
balance maturation
balance system in children
limits of stability
posturography
static and dynamic balance
Opis:
Introduction: The ability to Reach quickly to changing external stimuli, to move the body quickly and precisely in any direction and to maintain the centre of gravity above the support base, all contribute to maintaining balance in dynamic conditions. The Limits of Stability Test (LOS) provides information on the state of dynamic equilibrium in a standing position. Aim : Assessment of dynamic postural control in developmental age. Material : 127 healthy children (65 girls and 62 boys) aged 6 – 17years. Methods: All children underwent LOS test (posturograph NeuroCom) with registration of reaction time (RT), movement velocity (MVL), directional control (DCL) , maximum excursion (MXE) and endpoint excursion (EPE). Results: At the age of 6-7 years, not fully developed jumping strategy and visual feedback mechanism in the control of movement were observed. All tested parameters were significantly worse in children aged 6 – 9 years. After this period, a significant improvement in TR and MVL was observed, with no significant changes in subsequent age groups while significant improvement in MXE up to 12 , EPE and DCL up to 13 years of age was noted. No significant gender differences were fund in the LOS test parameters. Conclusions: 1 The LOS test showed significantly lower dynamic balance development in children aged 6 – 7 years. 2 The study showed a significant improvement in all parameters of the LOS test up to 13 years of age, which supports the termination of the function at that time.
Źródło:
Polish Journal of Otolaryngology; 2020, 74, 4; 18-24
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mathematical model of two-stage Solid Oxide Fuel Cell, SOFC, stacks for dynamic simulation of Combined Heat and Power system fed by natural gas
Autorzy:
Palus, Mateusz
Pianko-Oprych, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/1849273.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
dynamic model
natural gas
Solid Oxide Fuel Cell stacks
Combined Heat and Power
CHP
system
Balance of Plant
BoP
modelling
Catalytic Partial Oxidation
CPOx
reformer
steam reformer
Opis:
Zero-dimensional two-stage SOFC stacks dynamic model was developed to investigate the effect of operating parameters on stacks performance. The model resolves spatially thermal and thermo-electrochemical behaviour for electrochemical reactions, Catalytic Partial Oxidation and Steam Reforming processes. Design variables and thermo-electrochemical properties were obtained from in-house-fabricated SOFCs carried out by project partners. The completed SOFCs based Combined Heat and Power, CHP, system model was validated by data18 and numerical results obtained at steady-state mode showing its high-fidelity. A parametric study with respect to key operating parameters including changes in fuel utilization, lambda number and current density values was conducted. The global CHP system dynamic response, in term of the current/voltage delivered by two-stage SOFC stacks, under a fi xed fuel utilization, has been determined resulting in greater variations in the voltage of a single cell in the first stack in comparison to the corresponding values in the second stack.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 2; 1-11
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mathematical model of two-stage Solid Oxide Fuel Cell, SOFC, stacks for dynamic simulation of Combined Heat and Power system fed by natural gas
Autorzy:
Palus, Mateusz
Pianko-Oprych, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/1849268.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
dynamic model
natural gas
Solid Oxide Fuel Cell stacks
Combined Heat and Power
CHP
system
Balance of Plant
BoP
modelling
Catalytic Partial Oxidation
CPOx
reformer
steam reformer
Opis:
Zero-dimensional two-stage SOFC stacks dynamic model was developed to investigate the effect of operating parameters on stacks performance. The model resolves spatially thermal and thermo-electrochemical behaviour for electrochemical reactions, Catalytic Partial Oxidation and Steam Reforming processes. Design variables and thermo-electrochemical properties were obtained from in-house-fabricated SOFCs carried out by project partners. The completed SOFCs based Combined Heat and Power, CHP, system model was validated by data18 and numerical results obtained at steady-state mode showing its high-fidelity. A parametric study with respect to key operating parameters including changes in fuel utilization, lambda number and current density values was conducted. The global CHP system dynamic response, in term of the current/voltage delivered by two-stage SOFC stacks, under a fi xed fuel utilization, has been determined resulting in greater variations in the voltage of a single cell in the first stack in comparison to the corresponding values in the second stack.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 2; 1-11
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of a serial connection of two staged SOFC stacks in a CHP system fed by methane using Aspen TECH
Autorzy:
Pianko-Oprych, Paulina
Palus, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/779502.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Solid Oxide Fuel Cell stacks
Combined Heat and Power system
Balance of Plant
BoP
modelling
methane
Catalytic Partial Oxidation
CPOx
reformer
steam reformer
part and full load
steady state
dynamic model
Opis:
The objective of the study was to develop a steady-state system model in Aspen TECH using user-defined subroutines to predict the SOFC electrochemical performance. In order to achieve high overall fuel utilization and thus high electrical efficiency, a concept of Combined Heat and Power system with two-stage SOFC stacks of different number of cells was analyzed. The concept of two-stage SOFC stacks based system was developed in the framework of the FP7 EU-funded project STAGE-SOFC. The model was validated against data gathered during the operation of the proof-of-concept showing good agreement with the comparative simulation data. Following model validation, further simulations were performed for different values of fuel utilization to analyze its influence on system electrical performance. Simulation results showed that the concept of two-stage SOFC stacks configuration was viable and reliable. The model can be useful for development the optimal control strategy for system under safe conditions.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 1; 33-43
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the rotor eccentricity on the torque of a cage induction machine
Autorzy:
Silwal, B.
Rasilo, P.
Belahcen, A.
Arkkio, A.
Powiązania:
https://bibliotekanauki.pl/articles/141083.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cage induction machine
dynamic eccentricity
electromagnetic torque
energy balance
finite element method
harmonics
Opis:
The non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.
Źródło:
Archives of Electrical Engineering; 2017, 66, 2; 383-396
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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