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Wyszukujesz frazę "intensification" wg kryterium: Temat


Tytuł:
Numerical Analysis of Convective Heat Transfer for Selected Geometric System
Autorzy:
Orłowska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2174927.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
convection
intensification
protect
environment
Opis:
The contemporary problems and issues of environmental protection refer to a large extent to problems related – generally speaking – to energy. Currently, the production processes mainly concern the combustion of energy fuels, transport – over long distances, and their use for utility purposes, e.g. engine drive or heating. These processes significantly negatively impact the environment and are magnified by their enormous intensity and size. While energy production and transport processes have been studied for many years, and their results are widely published, the issues related to the application and operation of heating devices are little known and require much observation and research. The operating indicators of heating devices are generally characterized by low values (natural convection), and their artificial increase (intensity) cannot be used due to the acoustic effects and additional (significant) investment costs. The article presents some research results on the intensification of heat flow – i.e. the thermal efficiency of flat heaters placed in a room with a specific temperature. Physical phenomena were investigated numerically by shaping the heat exchange space. The tested systems concerned a room with a free-standing heater, a heater with a vertical panel mounted in parallel, and a system with a curved bottom plate forming the so-called de Laval nozzle. Interesting results of air velocity and temperature fields and values of the heat transfer coefficient along the height of the heater were obtained. Based on the presented research, it can be concluded that the creation of convection surfaces around the heater is advisable because it affects the intensity of heat exchange, which can be increased without energy-intensive energy expenditure, i.e. in a non-mechanical way. Undoubtedly contributes positively to investment and operating costs, which is essential in environmental protection issues.
Źródło:
Rocznik Ochrona Środowiska; 2022, 24; 163--171
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and theoretical study of surface cooling using a single microjet
Autorzy:
Mikielewicz, D.
Muszyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/175373.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface cooling
microjets
heat transfer intensification
Opis:
The experimental research of heat transfer due to impingement of a single microjet of water and air has been studied on a specially designed rig. Systematic data on radial wall temperature distribution were collected, which enabled development of empirical correlation for heat transfer coefficient applicable both for air and water flows. Two microjet nozzle diameters were studied, i.e. 180 and 260 ěm. The correlation describing the heat transfer coefficient was later used in validation of a model of a single microjet impinging on a flat plate, developed earlier by the authors. Such analytical model of microjet is of a great value in future analysis as it enables to carry out for example sensitivity tests or to appropriately select operational parameters. The presented model is quite general and its further modifications are possible when some of the imposed assumptions are relaxed. More experiments on the structure of a single microjet are needed which will confirm the correlation presented in the paper.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2010, 122; 95-110
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Intensification Factors on Quality of Fe Agglomerates Made with Alternative Fuel
Autorzy:
Semanová, Z.
Legemza, J.
Hrubovčáková, M.
Findorák, R.
Fröhlichová, M.
Powiązania:
https://bibliotekanauki.pl/articles/352355.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
processing
sintering
intensification
microstructure
agglomerate
fuel
Opis:
Currently is the biggest problem of metallurgical companies the increase of fossil fuel prices and strict environmental regulations. As a result of this, companies must look for alternatives that would reduce the amount of fossil fuels and reduce emissions. Wood sawdust has huge energy potential, which can be used in the process of agglomerate production. This type of energy is locally available, has some similar properties as fossil fuels and is economically advantageous. For these reasons, experimental study using laboratory agglomeration pan was realized to study the possibility of agglomerate production with a mixed fuel. Experimental results show the viability of mixed fuel use in the agglomeration process, but also show significant possibility for improvement. The maximum acceptable substitution ratio, which corresponds to qualitatively suitable agglomerate is 20% of pine sawdust. Based on the realized experiments and the obtained results we have acceded to the intensification of the agglomeration process with an objective to increase the amount of added substitution fuel while maintaining the required quality of agglomerate.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1853-1857
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of technological efficiency of oil production intensification in carbonate collector. Advantages of the technology of radial drilling
Autorzy:
Ziaja, J.
Movchan, V.
Powiązania:
https://bibliotekanauki.pl/articles/298631.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
drilling
radial drilling
intensification of oil production
Opis:
The paper presents a comparative analysis of the results of radial drilling, drilling perforation, cumulative reperforation and acid treatment. The study was focused at carbonate deposits in Russia. For each technology average incremental oil rates were estimated at the same exploration targets. The analysis of technological effectiveness in the given geologic and physical conditions revealed that drilling perforation and radial drilling allow reaching higher incremental oil rates compared to acid treatment and cumulative perforation. This fact confirms effectiveness of drilling radial canals by enlarging infiltration area. For the sake of completion radial drilling and drilling perforation are performed in the same wells. To reveal limiting conditions of applying radial drilling and drilling perforation an effectiveness analysis is made depending on the thickness of the interlayers exposed. To formulate criteria of radial exposing applicability an analysis of effects of different geological and physical formation parameters on geological and engineering operations effectiveness is done. The following parameters are considered: relation between the current formation pressure and initial formation pressure, formation permeability, skin factor, thickness of interlayers in overall perforation interval, thickness of interlayers exposed by radial canals.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 2; 303-312
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of heat transfer augmentation in heat exchangers with minichannels for marine applications
Autorzy:
Mikielewicz, D.
Wajs, J.
Powiązania:
https://bibliotekanauki.pl/articles/258932.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
heat transfer intensification
heat exchangers
pumping power
Opis:
In the paper, new trends in the development of microchannel heat exchangers are presented. The exchangers developed in this way can be applied in marine industry. Main attention is focused on heat exchanger design with reduced size of passages, namely based on microchannels. In authors’ opinion, future development of high power heat exchangers will be based on networks of micro heat exchangers.
Źródło:
Polish Maritime Research; 2017, S 1; 133-140
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of ORC’s for micro power generation
Autorzy:
Mikielewicz, Jarosław
Mikielewicz, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1191859.pdf
Data publikacji:
2018
Wydawca:
Gdańska Szkoła Wyższa
Tematy:
CHP
ORC
heat exchangers
heat transfer intensification
thermodynamics
Opis:
In the paper, new trends in development of micro power generation of heat and electricity are presented. New type of CHP for domestic usage is developed in the Institute of Fluid-Flow Machinery PAS and methods of its design are presented. The most promising trends in equipment of ORC cycle for this purpose were discussed. Main attention was focused on micro-heat exchangers design based on micro-channels and micro-jets. In our opinion future development of high power heat exchangers will be based on nets micro-heat exchangers.
Źródło:
Eco-Energetics: technologies, environment, law and economy; 2018, 1; 51--72
2657-5922
2657-7674
Pojawia się w:
Eco-Energetics: technologies, environment, law and economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of the cargo fleet vessels power plants ecological indexes by development of the exhaust gas systems
Autorzy:
Kuznetsov, Valerii
Dymo, Boris
Kuznetsova, Svitlana
Bondarenko, Mykola
Voloshyn, Andrii
Powiązania:
https://bibliotekanauki.pl/articles/1573635.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine power plant
emissions
gas-air cooler
nozzle
intensification
Opis:
Modernisation of the power plants of cargo fleet vessels to satisfy the requirements set out by the International Maritime Organisation is an urgent scientific and technical problem. The article presents the results of developing a solution to this problem that focuses on the exhaust gas system. We propose the use of ejection nozzles as part of this system. It was found that when the ejection coefficient in these nozzles is n = 3, it is possible to exclude the use of SCR reactors, thus reducing the operating costs of the marine power plant. Using a mathematical modelling method, the efficiency of operation of six types of nozzle as part of the exhaust gas system was investigated, and a constructive layout was proposed for the gas ducts and inlet louvres for supplying ambient air. To increase the efficiency of the proposed system, we consider several options for intensifying heat transfer processes through the use of dimple systems in the nozzles and nozzles with swirling flow. We found that these technical solutions would make it possible to further increase the efficiency of the systems by up to 19% abs.
Źródło:
Polish Maritime Research; 2021, 1; 97-104
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cellular Automata Markov Method, an Approach for Rice Self-Sufficiency Projection
Autorzy:
Sutrisno, Dewayany
Ambarwulan, Wiwin
Nahib, Irmadi
Turmudi, -
Suryanta, Jaka
Windiastuti, Rizka
Kardono, Priyadi
Powiązania:
https://bibliotekanauki.pl/articles/952384.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
rice field
conversion
food security
intensification
food
Indramayu
Indonesia
Opis:
This article discusses the ability of the Cellular Automata (CA) Markov method to project rice sufficiency by considering the conversion of massive rice fields, such as the ones in Indonesia. The conversion of rice fields into land use for non-farming due to the rapidly growing population, industry and economic needs is increasingly affecting the rice self-sufficiency. With the development of remote sensing techniques, such as CA Markov, which has been used for years in spatial change projection, there is a need to assess the rice field conversion and its impact on the rice field self-sufficiency. The process is not solely based on CA Markov but also includes an object-based classification method utilising multi-temporal spot image data to derive land use maps, CA Markov for rice field conversion projection and rice self-sufficiency assessment, which was developed by assessing the availability of rice, consumption and production. Using the Indramayu district as the study area, the results indicate that within the next 20 years, the rice field area will decrease, and the impact on rice self-sufficiency will be 5.34 for Business as usual (BAU) and 0.47 when considering population growth. The previous research validated the results and indicated the efficiency of this method for rice self-sufficiency projection. Moreover, a management assessment was also conducted and indicated that in order to maintain rice self-sufficiency, innovation in the planting and seed systems as well as in farmers’ welfare management, such as incentives and subsidies, local food diversification systems and innovative food technique development to support food diversification, should be considered.
Źródło:
Journal of Ecological Engineering; 2019, 20, 6; 117-125
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Specific Heat Flux During Boiling of the Dispersed Phase of the Emulsion
Autorzy:
Pavlenkо, Anatoliy
Koshlak, Hanna
Basok, Borys
Hrabova, Tatiana
Powiązania:
https://bibliotekanauki.pl/articles/27315739.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
steam explosion
homogenisation
boiling
intensification of heat
mass transfer
Opis:
The intensity of heat exchange between the boiling emulsion and the enclosing surfaces is associated with the physical phenomena of the formation, growth, and destruction of vapour bubbles of the low-boiling component in the liquid phase. This article presents a methodology to assess the intensity of heat exchange processes. Using this technique, it is possible to predict the energy parameters of heat exchange equipment and the degree of intensification of heat transfer processes.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 16--24
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Escape from Etymology? A Corpus Study of Polish Adjectival Intensifiers
Ucieczka od etymologii? Korpusowe studium polskich przysłówków wzmacniających
Autorzy:
Dziwirek, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1848241.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
adjective
etymology
connectivity
semantic specificity
intensification
intensyfikacja
przymiotnik
etymologia
łączliwość
specyficzność semantyczna
Opis:
Using the Polish National Corpus (NKJP), the author discusses 31 Polish reinforcing adverbs to determine the degree of their semantic specificity and freedom of connection with adjectives. Empowering adverbs express the person’s judgement, attitudes, and emotions. The author shows that most of the reinforcing adverbs have not deviated from their etymology, even though they are considered synonyms of the word “very”: their etymological meanings influence the choice of the adjective. The most frequently reinforced adjectives in NKJP are “difficult”, “important” and “essential”.
Używając Narodowego Korpusu Języka Polskiego (NKJP), autorka omawia 31 polskich przysłówków wzmacniających, aby określić stopień ich specyficzności semantycznej oraz dowolności łączenia się z przymiotnikami. Przysłówki wzmacniające wyrażają sądy, postawy i emocje osoby mówiącej. Autorka pokazuje, że większość przysłówków wzmacniających nie oddaliło się od swojej etymologii, mimo że są uważane za synonimy słowa bardzo: ich etymologiczne znaczenia wpływają na wybór przymiotnika. Najczęściej wzmacniane przymiotniki w NKJP to trudny, ważny i istotny.
Źródło:
Annales Universitatis Mariae Curie-Sklodowska, sectio N – Educatio Nova; 2020, 5; 453-472
2451-0491
Pojawia się w:
Annales Universitatis Mariae Curie-Sklodowska, sectio N – Educatio Nova
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ensuring the economic efficiency of enterprises by multi-criteria selection of the optimal manufacturing process
Autorzy:
Kotliar, Alexey
Basova, Yevheniia
Ivanov, Vitalii
Murzabulatova, Olena
Vasyltsova, Svitlana
Litvynenko, Mariia
Zinchenko, Olena
Powiązania:
https://bibliotekanauki.pl/articles/406764.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
prismatic part
multiproduct manufacturing
machining
optimality criteria
optimization
shaping intensification
profit intensity
Opis:
Technological assurance and improvement of the economic efficiency of production are the first-priority issues for the modern manufacturing engineering area. It is possible to achieve a higher value of economic efficiency in multiproduct manufacturing by multicriteria optimization. A set of optimality criteria based on technological and economic indicators was defined with the aim of selecting the optimal manufacturing process. Competitive variants and a system of optimization were developed and investigated. A comparative analysis of the optimality criteria and their influence on the choice of optimal machining processes was carried out. It was determined that the batch of parts made an impact on the selection of the manufacturing process.
Źródło:
Management and Production Engineering Review; 2020, 11, 1; 52-61
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tabu search: global intensification using dynamic programming
Autorzy:
Wilbaut, C.
Hanafi, S.
Fréville, A.
Balev, S.
Powiązania:
https://bibliotekanauki.pl/articles/970871.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
programowanie dynamiczne
tabu search
dynamic programming
global intensification
multidimensional 0-1 knapsack problem
Opis:
Tabu search has proven highly successful in solving hard combinatorial optimization problems. In this paper, we propose a hybrid method that combines adaptive memory, sparse dynamic programming, and reduction techniques to reduce and explore the search space. Our approach starts with a bi-partition of the variables, involving a small core problem, which never exceeds 15 variables, solved using the "forward" phase of the dynamic programming procedure. Then, the remaining subspace is explored using tabu search, and each partial solution is completed with the information stored during the forward phase of dynamic programming. Our approach can be seen as a global intensification mechanism, since at each iteration, the move evaluations involve solving a reduced problem implicitly. The proposed specialized tabu search approach was tested in the context of the multidimensional 0-1 knapsack problem. Our approach was compared to ILOG's commercial product CPLEX and to the corresponding "pure" tabu search (i.e., without a core problem) for various sets of test problems available in OR-libraries. The results are encouraging. In particular, this enhances the robustness of the approach, given that it performs better than the corresponding pure tabu search most of the time. Moreover, our approach compares well with CPLEX when the number of variables is large; it is able to provide elite feasible solutions in a very reasonable amount of computational time.
Źródło:
Control and Cybernetics; 2006, 35, 3; 579-598
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linguistic notes: on iota and comma
Autorzy:
Korpysz, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/17896366.pdf
Data publikacji:
2021-02-24
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Cyprian Norwid
pisownia
interpunkcja
przecinek
koma
jota
intensyfikacja
spelling
punctuation
comma
iota
intensification
Opis:
In Norwid’s writings, the nouns koma [comma] and jota [iota] that literally mean respectively: ‘comma’ and ‘the ninth letter of the Greek alphabet’ or ‘the Polish letter and consonant j’, in the vast majority of cases have secondary, figurative meanings – in particular, when they are elements of phraseological units, but also in some other contexts they usually refer to some small elements of a text. It is symptomatic that a large part of Norwid’s usages more or less directly refer to the well-known biblical quotation from the Gospel of Matthew, which in King James Version reads: “For verily I say unto you, till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.” Norwid’s use of comma and iota analysed in this article indirectly confirms the importance that the poet attached not only to the graphic layout and punctuation, or more generally to the formal aspects of the texts, but also to their proper, profound understanding.
Źródło:
Studia Norwidiana; 2019, 37 English Version; 215-226
0860-0562
Pojawia się w:
Studia Norwidiana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Numerical Study of The Heat Transfer Intensification Using High Amplitude Acoustic Waves
Autorzy:
Rulik, S.
Wróblewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/177492.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cavity noise
sound wave cooling
flow over a cavity
transient cooling
blade cooling intensification
Opis:
The current practice in the efforts aiming to improve cooling conditions is to place emphasis on the application of non-stationary flow effects, such as the unsteady jet heat transfer or the heat transfer intensification by means of a high-amplitude oscillatory motion. The research presented in this paper follows this direction. A new concept is put forward to intensify the heat transfer in the cooling channels with the use of an acoustic wave generator. The acoustic wave is generated by a properly shaped fixed cavity or group of cavities. The sound generated by the cavity is a phenomenon analysed in various publications focused on the methods of its reduction. The phenomenon is related to the feedback mechanism between the vortices flowing from the leading edge and the acoustic waves generated within the cavity. The acoustic waves are generated by the interaction between the vortices and the cavity walls. Strong instabilities can be observed within a certain range of the free flow velocities. The investigations presented in this paper are oriented towards the use of the phenomenon for the purposes of the heat transfer process intensification. The first part of the work presents the numerical model used in the analysis, as well as its validation and comparison with empirical relations. The numerical model is constructed using the commercial CFD Ansys CFX-16.0 commercial program. The next part includes determining of the relationship between the amplitude of the acoustic oscillations and the cooling conditions within the cavity. The calculations are performed for various flow conditions.
Źródło:
Archives of Acoustics; 2018, 43, 1; 31-47
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Future We Want: Sustainable Development Goals Accomplishment with Organic Agriculture
Przyszłość, której chcemy: możliwości osiągnięcia Celów Zrównoważonego Rozwoju w rolnictwie ekologicznym
Autorzy:
Šeremešić, Srđan
Dolijanović, Željko
Simin, Mirela Tomaš
Vojnov, Bojan
Trbić, Danica Glavaš
Powiązania:
https://bibliotekanauki.pl/articles/1840940.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:
organic agriculture
ecological intensification
agroecology
sustainability
environment
rolnictwo ekologiczne
intensyfikacja ekologiczna
agroekologia
zrównoważoność
środowisko
Opis:
The aim of the paper is to enlighten the role that organic agriculture can have in the achievement of Sustainable Development Goals (SDG). Currently, sustainable agriculture systems are not adequately recognized in SDG and supported by the decision-makers. Given that agriculture plays one of the key roles in sustainable development accomplishment, the introduction of an organic agriculture can be a basis to implementing SDG. Organic agriculture has multiple benefits as most valuable option in redesigning food systems to achieve ecological, economic, and social sustainability. Moreover it could encompass and establish food system from field to fork necessary to complete the SDG without oversize resource depletion and negative impact on the environment. The study showed that by placing organic agriculture in the agenda of SDG it is possible to create conditions for sustainable development while identify and manage trade-offs in agriculture and maximising co-benefits.
Celem artykułu jest wyjaśnienie roli, jaką rolnictwo ekologiczne może odgrywać w osiąganiu celów zrównoważonego rozwoju (SDG). Obecnie systemy zrównoważonego rolnictwa nie są odpowiednio uwzględniane w SDG i wspierane przez decydentów. Biorąc pod uwagę, że rolnictwo odgrywa jedną z kluczowych ról w realizacji zrównoważonego rozwoju, wprowadzenie rolnictwa ekologicznego może być podstawą do rzeczywistej realizacji SDG. Rolnictwo ekologiczne ma wiele zalet, jako najcenniejsza opcja w przeprojektowywaniu systemów żywnościowych w celu osiągnięcia zrównoważonego rozwoju ekologicznego, gospodarczego i społecznego. Ponadto może ustanowić system żywnościowy od pola do stołu niezbędny do ukończenia celu zrównoważonego rozwoju bez nadmiernego wyczerpywania zasobów i negatywnego wpływu na środowisko. Badanie wykazało, że umieszczając rolnictwo ekologiczne w agendzie SDG można stworzyć warunki dla zrównoważonego rozwoju, jednocześnie identyfikując i zarządzając kompromisami w rolnictwie oraz maksymalizując korzyści.
Źródło:
Problemy Ekorozwoju; 2021, 16, 2; 171-180
1895-6912
Pojawia się w:
Problemy Ekorozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł

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