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Wyszukujesz frazę "low efficiency" wg kryterium: Wszystkie pola


Tytuł:
Innovations in education: High demand, low efficiency?
Innowacje w edukacji: Wysokie zapotrzebowanie, niska skuteczność?
Autorzy:
Nowosad, Inetta
Błaszczyk, Maja
Powiązania:
https://bibliotekanauki.pl/articles/544210.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Tematy:
change
effectiveness of education innovation
innovation in education
Opis:
The rate and the scope of changes in education are reasons to take up the subject of innovation, which is more marked in the outside environment than within school walls. This indicates the problem of a mismatch between the skills attained within the educational system and employers’ needs. OECD experts see a solution to this problem in creating an innovative environment at school and justifying the central place of innovation in political and educational debates. The assessment of conditions that have built up the existing demand for innovation has become a basis for viewing innovation in education as a scientific category, including the distinction between innovation and change. The analysis of definitions was made here through the prism of utility and relevance to school reality. The analyses carried out in the article answer the question of whether we are dealing with an excess or a lack of innovation within school reality.
Źródło:
Przegląd Pedagogiczny; 2019, 2; 323-334
1897-6557
Pojawia się w:
Przegląd Pedagogiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nieskuteczność kontroli końcowej przyczyną niskiej efektywności procesu wytwarzania
Ineffectiveness of a final control as a cause of the low efficiency of the manufacturing process
Autorzy:
Bożek, M.
Rogalewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/270008.pdf
Data publikacji:
2013
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
efektywność
proces wytwarzania
kontrola wzrokowa
efficiency
manufacturing process
visual inspection
Opis:
Artykuł podejmuje problem wpływu niewłaściwie zaplanowanej kontroli jakości na efektywność procesu wytwarzania. Na przykładzie wybranego narzędzia chirurgicznego opisano i wyznaczono wartości wybranych wskaźników skuteczności i efektywności jakościowej procesu oraz skuteczności procesu kontroli. Pokazano, że w niektórych przypadkach umiejscowienie kontroli w końcowym etapie procesu produkcji może prowadzić do drastycznego obniżenia efektywności procesu.
The article deals with the problem of an influence of incorrectly planned quality inspection on the efficiency of the manufacturing process. On the example of chosen surgical instrument, values of chosen quality process efficiency and effectiveness indices and quality inspection effectiveness index were described and computed. It was shown that in some cases placing a quality inspection at the end of production process can lead to a drastic decrease of the process efficiency.
Źródło:
Inżynieria Maszyn; 2013, R. 18, z. 1; 84-96
1426-708X
Pojawia się w:
Inżynieria Maszyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Various designs of the two-stroke engine heads with the valve flushed system
Autorzy:
Łoza, Ł.
Kaźmierczak, A.
Borkowska, J.
Skorupa, P.
Krakowian, K.
Cienciała, M.
Powiązania:
https://bibliotekanauki.pl/articles/242546.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engine
two-stroke
internal combustion
valve flushed system
piston-controlled cam
high petrol consumption
oil in the petrol
toxic by-products
loud noise
uneven running
low efficiency
Opis:
The two-stroke engines have never acquired the popularity of the four-stroke engines due to their inherent performance limitations. The tasks of many engineering teams were to find the basic causes, which resulted in the inferior performance of these engines. Today’s task is to build a two-stroke engine whose performance could match that of a four-stroke engine in areas of common use. The most typical performance problems of a two-stroke engine are high petrol consumption caused by low efficiency, toxic by-products of combustion being emitted into the atmosphere (caused by oil present in the petrol), and uneven and loud engine noise. The greatest challenge is to achieve a good chamber purge during one stroke in which the fresh fuel mixture flows through the piston-controlled inlet port while at the same time the fumes are being exhausted through the outlet port. This in contrast with the four-stroke engines where the intake and exhaust are each done with two separate strokes. From the energy point of view, the two-stroke engine is not efficient because a certain amount of fresh fuel is being wasted in the exhaust fumes. We propose to replace the piston-controlled cam with the valve-flushed system, which will cause the combustion process to become more efficient. The purpose of this paper is to present various designs of the engine heads and analyse their performance. The goal of this proposal is to choose the best combination of these engine heads in order to achieve the optimum overall engine performance.
Źródło:
Journal of KONES; 2015, 22, 4; 187-190
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation efficiency of low-power fans used in the means of transport
Autorzy:
Nygard, Adam
Bartoszewicz, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2097474.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
fans
low-power fan
evaluation efficiency
fan efficiency
transport
wentylatory
wentylator małej mocy
ocena wydajności
wydajność wentylatora
Opis:
The article presents test results on low-power fans used in the means of transport. Fans evaluation was in the context of energy efficiency. Interest in scientific topics related to low-power fans has its source in the reports of the Chief Inspector of Environmental Protection on the state of the natural environment in Poland and European Union reports assessing our natural environment. The goal of the article is to compare experimental results with Minister of Economy Regulation of March 11th, 2014, which introduces changes in accordance to European Parliament and Council Directive 2009/125/WE, with regard to ecodesign requirements for fans driven by motors with an electric input power between 125 W and 500 kW.
Źródło:
Combustion Engines; 2020, 59, 4; 15--20
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of nickel adsorption onto low Jordanian zeolite dose: efficiency and Langmuir – Freundlich behaviour
Autorzy:
Al-Ghazawi, Ziad
Qasaimeh, Ahmad
Al-Bataina, Bilal
Powiązania:
https://bibliotekanauki.pl/articles/1841957.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
batch reactor
Freundlich
isotherm
Langmuir
low dose
metals
nickel
wastewater
zeolite
Opis:
In this work, nickel adsorption onto low Jordanian zeolite dose is being investigated. Natural zeolite doses were stirred continuously with nickel solutions in batch reactors at 180 RPM for 24 hours, where the temperature was set to 20°C. The pH was initially 4.5 and reached 5.2 at equilibrium. The removal efficiency of nickel reaches maximum value when the initial nickel concentration is around 1 ppm and then tends to decrease when the initial nickel concentration increases above 1 ppm. The optimal nickel removal reaches 65% when the initial nickel concentration is 1 ppm and the zeolite dose is 26 mg∙dm–3. This study investigates the behaviour of nickel removal and modelling isotherms below and above this critical peak point. At this level of zeolite dose, the adsorption does not follow either Freundlich or Langmuir isotherms, but rather, it follows Freundlich for the data plot just below the peak point with the highest coefficient of determination (R2) equals (0.98) when the zeolite dose is (26 mg∙dm–3), whereas it follows Langmuir for the data plot just above the peak point with the highest coefficient of determination (R2) equals (0.99) when the zeolite dose is (10 mg∙dm–3). These findings clarify the theory behind each isotherm and can be used to find new information for efficient treatment techniques.
Źródło:
Journal of Water and Land Development; 2021, 50; 150-157
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating the efficiency of low pressure part of steam turbines based on probing measurements
Autorzy:
Gardzilewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/175464.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wet steam
steam turbines
measurements
numerical calculations
Opis:
A methodology oflow pressure part turbine efficiency evaluation based on measurements of the steam flow parameters in the interspaces between neighbouring stages is described. Specially manufactured probes have been applied carry out such measurements. The efficiencies of the stages operating in the superheated steam zone result directly from experimental values of pressures, temperatures, and flow angles. To complete the efficiency evaluation for the stages operating in the wet steam region, a relevant estimation of blading system losses has been proposed and validated. This evaluation of losses is compatible with the measurement results. Adaptation of a comparative error analysis makes it possible to show the advantages of the methodology over the thermal balance applied during performance tests. The low pressure turbine efficiency evaluation methodology has been applied to numerous steam turbine power units of 200–500 MW output.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 41-56
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Highest efficiency and ultra low emission - internal combustion engine 4.0
Autorzy:
Friedl, Hubert
Fraidl, Günter
Kapus, Paul
Powiązania:
https://bibliotekanauki.pl/articles/2097449.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
passenger car
gasoline
diesel
hybrid
powertrain
samochód osobowy
benzyna
hybryda
układ przeniesienia napędu
Opis:
In the future, the simultaneous reduction of pollutant and CO2 emissions will require significantly enhanced powertrain functionalities that cannot only be adequately represented by the ICE (internal combustion engine) alone. Both automated transmissions and especially powertrain electrification can help to meet efficiently those extended requirements. The extended functionalities are no longer applied exclusively with the ICE itself ("Fully Flexible Internal Combustion Engine"), but distributed across the entire powertrain ("Fully Flexible Powertrain"). In addition, the powertrain will be fully networked with the vehicle environment and thus will utilize all data that are useful for emission and consumption-optimized operation of the ICE. Combustion engine and electrification often complement each other in a synergetic way. This makes it extremely sensible for the combustion engine to evolve in future from a "single fighter" to a "team player". If one compares the requirements of such an ICE with the definition of Industry 4.0, then there are extensive correspondences. Thus, it seems quite opportune to call such a fully networked combustion engine designed to meet future needs as “Internal Combustion Engine 4.0 (ICE 4.0)”. This even more so, as such a name can also be derived from the history: e.g. ICE 1.0 describes the combustion engines of the first mass-produced vehicles, ICE 2.0 the combustion engines emission-optimized since the 1960s and ICE 3.0 the highly optimized "Fully Flexible Combustion Engine", which currently offers a high torque and performance potential combined with low fuel consumption and pollutant emissions. In addition to further improvements in fuel consumption, the "Combustion Engine 4.0" offers such a low level of pollutant emissions that can best be described as "Zero Impact Emission". This means that such future ICE´s will no longer have a negative impact on the imission situation in urban areas. With the e-fuels topic, the ICE also has the potential to become both CO2- and pollutant-neutral in the medium and long term. This means that the ICE - also in passenger cars - will continue to be an essential and necessary cornerstone for future powertrain portfolios for the next decades.
Źródło:
Combustion Engines; 2020, 59, 1; 8--16
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced separation efficiency of low–rank coal using waste engine oil as a flotation collector
Autorzy:
Li, Ming
Xia, Yangchao
Guo, Fangyu
Rong, Guoqiang
Li, Guosheng
Xu, Baolin
Xing, Yaowen
Gui, Xiahui
Powiązania:
https://bibliotekanauki.pl/articles/109613.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
low rank coal
engine oil
waste engine oil
flotation
Opis:
Because of the rich oxygen-containing functional groups and developed pores on the Surface of low-rank coal, it is difficult to realize efficient separation during low-rank coal flotation using common oil collectors. Waste engine oil (WEO) is abundant in polar oxygen-containing functional groups and could be an alternative collector. In this study, the effect of WEO on low-rank coal floatation was assessed and engine oil (EO) was also used for comparison. The results show that the separation efficiency of low-rank coal can be significantly improved using WEO; additionally, 96.73% of the clean coal yield can be obtained when the WEO dosage was only 4 kg/t. Compared with EO, the bubble–particle induction time in the presence of WEO shortened from 430 to 220 ms. Moreover, more low-rank coal particles were captured and adhered to the bubble surface using WEO, which indicated a higher probability of bubble–particle attachment. Nonpolar components, polar components and metal ions synergistically promote the flotation separation enhancement of low-rank coal using WEO.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 2; 252-263
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efektywność wznoszenia budynków niskoenergetycznych i termomodernizacji istniejących
Efficiency of raising low-energy buildings and thermomodernization of existing ones
Autorzy:
Sadowska, B.
Sarosiek, W.
Powiązania:
https://bibliotekanauki.pl/articles/209720.pdf
Data publikacji:
2014
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
termomodernizacja
budynki niskoenergetyczne
efektywność energetyczna
efektywność ekonomiczna
thermomodernization
low-energy buildings
energy efficiency
economic efficiency
Opis:
W artykule przedstawiono wskaźniki energetyczne budynków poddanych termomodernizacji oraz możliwe do osiągnięcia efekty ekonomiczne. Wskazano rozwiązania techniczne pozwalające na znaczne obniżenie potrzeb cieplnych projektowanych obiektów.
Energy indexes and economical results of thermomodernization of buildings are presented in this paper. Solutions and elements used in building for achieving low level of energy saving are specified.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2014, 63, 1; 179-191
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficiency and ecological efficiency of low power furnace powered with depolymer secondary fuel
Efektywność energetyczna i ekologiczna kotła małej mocy zasilanego depolimerowym paliwem wtórnym
Autorzy:
Swat, M.
Powiązania:
https://bibliotekanauki.pl/articles/258302.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
combustion
liquid fuel furnace
alternative fuel
depolymer
energy efficiency
ecological efficiency
spalanie
kocioł na paliwo płynne
paliwo alternatywne
depolimer
sprawność energetyczna
sprawność ekologiczna
Opis:
The use of oil fraction, derived from the depolymerisation of waste plastics, as a fuel is becoming increasingly important, because apart from being a source of energy, it can solve the problem of disposing of waste that is harmful to the environment. Based on the study, the effect of the use of depolymer is based on the values of the basic parameters of the combustion process in a low-power furnace. The variation of value of excess air ratio and the value of flue gas temperature and value of the concentrations of toxic substances in fumes during combustion processes were assessed. The amounts of heat generated in the furnace during combustion of depolymers and its fuel mixtures with heating oil were established. Controlled changes in process parameters of the combustion conditions of depolymer and the selected mixtures of fuel oil allow the ecological operation of the processes of combustion in commercial low-power furnaces.
Zastosowanie frakcji olejowej pochodzącej z depolimeryzacji odpadowych tworzyw sztucznych jako paliwa nabiera coraz większego znaczenia, ponieważ oprócz tego, że może być źródłem energii – rozwiązuje również problem utylizacji uciążliwych dla środowiska odpadów. Na podstawie przeprowadzonych badań określono wpływ depolimeru na przebieg podstawowych parametrów procesu spalania w urządzeniu kotłowym małej mocy. Określono zmiany współczynnika nadmiaru powietrza, zmiany temperatur gazów spalinowych, zmiany stężeń toksycznych składników spalin w trakcie procesów spalania. Ustalono ilości energii cieplnej wytworzonej w instalacji kotłowej w trakcie spalania depolimeru i jego mieszanin paliwowych z olejem opałowym. Kontrolowane zmiany parametrów procesowych warunków spalania depolimeru i wybranych mieszanin z olejem opałowym pozwalają na ekologiczne prowadzenie procesów spalania w komercyjnych kotłach małej mocy.
Źródło:
Problemy Eksploatacji; 2016, 1; 93-103
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł

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