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Wyświetlanie 1-15 z 44
Tytuł:
Nonlinear drift of the spring gravimeter caused by air pressure from the kunming GS15 gravimeters
Autorzy:
Wei, J.
Shen, W.
Li, H.
Liu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/260586.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
GS15 gravimeter meter
air pressure admittance
nonlinear air pressure correction
superconducting gravimeter
Opis:
In order to monitor and correct the meteorological factors of the spring gravity meter, the characteristics of the time varying gravity changes caused by meteorological factors were analyzed. Kunming GS15 gravity meter from 2007 continuous gravity observation has been carried out with the sampling rate of the pressure observation. In this study, we first compare the effects of 4 types of gravity meter and 3 different types of stations on the gravity observed seasonal gravity signals. It is indicated that the observed seasonal gravity signal of the cave is only 1/10, and there is a constant temperature and constant pressure device. Compared with the same time, the gravity signal of the gravity signal is about 100 times smaller. The influence of the pressure load of the gravity meter is tested by using the theory of pressure. The results show that only the actual value of 2cpd - 3cpd pressure load varies from -0.395 to -0.280×10-8ms-2 , and the 1cpd to 1 cpm periodic partial type gravity meter is also in accordance with the law of gravity and air pressure. And with the characteristics of time lag. In this paper, the nonlinear zero drift parameters of the linear regression model with time lag and the time series of the GS15 gravity meter are used to simulate the nonlinear zero drift parameters of the gravity meter. The results show that the gravity signal contains time lag 35 hours, and the air pressure admittance is 0.8 × 10-8ms-2/mbar. The correlation can reach 79%. The gravity changes signal and satellite gravity as well as the gravity water load signal of the land water model are the same as the gravity water load signal in the autumn as the minimum value, and the seasonal variation of the maximum value of gravity in summer.
Źródło:
Polish Maritime Research; 2016, S 1; 180-186
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Router performance characteristics at different air pressure levels
Autorzy:
Lechowicz, Daniel
Grobleny, Piotr
Podziewski, Piotr
Szymanowski, Karol
Pałubicki, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/2206677.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
milling machines
air pressure
frezarki
ciśnienie powietrza
Opis:
Router performance characteristics at different air pressure levels. The aim of this study was to determine influence of the air pressure on the performance characteristics of wood plunge router. Temperature increase, amplitude of vibrations and power consumption at different air pressure levels were examined in this paper. The advantageous results obtained indicate the need for further research.
Charakterystyka wydajności frezarki przy różnych poziomach ciśnienia powietrza. Celem tego badania było określenie wpływu ciśnienia powietrza na charakterystyki pracy frezarki do drewna. W niniejszej pracy zbadano wzrost temperatury, amplitudę drgań i pobór mocy przy różnych poziomach ciśnienia powietrza. Uzyskane korzystne wyniki wskazują na potrzebę dalszych badań.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2019, 106; 72--77
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of air springs volume using indirect method in the design of selected pneumatic devices
Autorzy:
Urbansky, M.
Homišin, J.
Kaššay, P.
Krajňák, J.
Powiązania:
https://bibliotekanauki.pl/articles/386269.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
air tank volume determination
indirect method
air pressure measurement
Opis:
At our department, we deal with continuous tuning of torsional oscillating mechanical systems (TOMS) during their operation in terms of torsional oscillation size. Therefore, a new mobile mechanical system was built for purposes of research and presentation of the TOMS continuous tuning using extremal control method, which main advantage is that we do not need to know a mathematical model of the mechanical system. The new mobile device is equipped with a special compressed air distribution system, which important components are air springs. The air springs are modified and used as air pressure tanks with various functions in the mobile device. Therefore, it is important to know the magnitude of the air springs inner volume. This paper deals with determination of air springs volume using indirect method, which is based on the air pressure measurement and also the comparison of obtained results with the results computed from air springs manufacturer data.
Źródło:
Acta Mechanica et Automatica; 2018, 12, 1; 19-22
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of air content on thermal degradation of poly(ethylene terephthalate)
Autorzy:
Rejmer, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2069750.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
poly(ethylene terephthalate)
degradation
accelerated aging
air content
air pressure
Opis:
The aim of these research is to investigate the air content on aging of poly-(ethylene terephthalate) (PET) preforms. Three air pressures were selected and in each pressure 5 samples were aged during 21 days in 80°C. Three samples were selected to be cut for determination of density with the use of hydrostatic method. Sample mass, Young modulus and surface roughness were measured for each sample before and after aging and differences between those parameters were presented as results. The changes of parameters may lead to a conclusion that mechanism of polymeric chain oxidation is dominant during thermal aging of PET. However aging process is not the fastest in atmospheric pressure but in lower air contents. This effect may be caused by greater evaporation of small molecule degradation products and shifting of reaction equilibrium in the direction of further decomposition.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2021, 24(1); 183--193
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement and analysis of the air pressure curve on the rigid lenses by use of ocular response analyzer
Autorzy:
Kasprzak, H.
Mazur, E.
Widlicka, M.
Powiązania:
https://bibliotekanauki.pl/articles/307438.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
okulistyka
ciśnienie śródgałkowe
lepkosprężystość
ORA
ocular viscoelasticity
intraocular pressure
air pressure curve
Opis:
Purpose: Pressure curves obtained from Ocular Response Analyzer (ORA) differ for the same patient in form and height. In some cases measurements on the subject show significant differences between recorded pressure curves. The purpose of the paper is to examine if the differences result from the corneal properties or from the device operation. Methods: Examination of air pressure curves was carried out on four plano-convex glass lenses with radii of curvature close to the central corneal radius. Lenses were mounted in front of the air jet of the ORA analyzer. Series of 30 measurements on each lenses were recorded with 20s and 60s time interval between measurements. Results were exported to computer and analyzed numerically Results: Results show much higher reproducibility of pressure curves in every series of measurements in comparison to pressure curves recorded on the patients eye. This demonstrates that ORA produces air pulses with high reproducibility. Conclusions: Differences in air pressure pulses for the real eye can indicate the dynamics of ocular properties during measurements. Obtained pressure curves are not symmetrical and not well fitted by Gaussian curve. Type of asymmetry of air pressure curves may be explained by viscoelasticity of air.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 4; 117-121
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research, Calculation and Proposal of Ventilation Solution for Duong Huy Coal Mine when Mining Down to -250 m Depth
Autorzy:
Dao, Van Chi
Le, Tien Dung
Vu, Thai Tien Dung
Nguyen, Hong Cuong
Powiązania:
https://bibliotekanauki.pl/articles/2020250.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
main fan
working mode
ventilation
airflow
air pressure
air velocity
wentylacja
ciśnienie
powietrze
Opis:
At present, according to the extraction plan in the year 2020 of Duong Huy Coal Company - Vinacomin, the mining is divided into three main zones: Central Zone extracts 06 faces; South Zone extracts 2 faces and Northeast Zone extracts 2 faces. The designated total production of all zones is 1,880,000 tons/year. To ensure the production of each mining zone, exhaust fan stations are installed at ventilation roadway adits with a total of 05 main fan stations. However, in the near future, to ensure and maintain production activities, the mine is being planned and operated using 03 main fan stations. The calculation results for the reasonable working mode of fan stations are as follows: for fan station FBCDZ8-№32B at level +47 m, airflow is 167.69 m3 /s and air pressure is 243.74 mm H2O; for fan station 2K56- №30 level +40 m, airflow is 123.37 m3 /s and air pressure is 324.79 mm H2O; for fan station FBCDZ-8- №32B at level +44 m, airflow is 167.69 m3 /s and air pressure is 354.99 mm H2O.
Źródło:
Inżynieria Mineralna; 2021, 2; 513--520
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of compressed air pressure on geometric structure of AISI 1045 steel surface after turning with the use of MQCL method
Autorzy:
Maruda, R. W.
Powiązania:
https://bibliotekanauki.pl/articles/102690.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
compressed air pressure
emulsion flow
geometric structure
MQCL
near-dry cutting
Opis:
MQL (Minimum Quantity Lubrication) and MQCL (Minimum Quantity Cooling Lubrication) methods become alternative solutions for dry machining and deluge cooling conditions. Due to a growing interest in MQCL method, this article discusses the impact of compressed air pressure, which is one of the basic parameters of generating emulsion mist used in MQCL method, on the geometric structure of the surface after turning AISI 1045 carbon steel. This paper presents the results of measurements of machined surface roughness parameters Ra, Rz, RSm as well as roughness profiles and Abbot-Firestone curves. It was found that the increase in the compressed air pressure from 1 to 7 MPa causes an increase in the roughness of the machined surface (the lowest values were obtained at a pressure of 1 MPa). An increase of emulsion mass flow rate also causes an increase in the value of selected parameters of roughness of the machined surface.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 30; 159-163
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Climatic change on King George Island in the years 1948–2011
Autorzy:
Kejna, Marek
Araźny, Andrzej
Sobota, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/2051395.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic
South Shetland Islands
climate
air temperature
air pressure
pre−cipitation
sea surface temperature
sea−ice
Źródło:
Polish Polar Research; 2013, 2; 213-235
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on influence of change marine diesel engine of charging air parameters on its nitrogen oxides emission
Autorzy:
Witkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/247498.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
laboratory tests
supercharging air pressure
exhaust gas content
emission of nitric oxides
heavy fuel oils
Opis:
The article presents the results of experimental tests of the influence of charging air pressure on content of exhaust gas, especially content nitric oxides (NOx), ofship diesel engine supplied with marine heavy fuel oil IF 40. Nitric oxides emissions for a given engine will depend on charging air parameters. Change of air parameters in this method of reducing NOX emissions involves cooling the air and changes in pressure at the beginning of compression stroke. The process of cooling the scavenging air means decreases the inlet air temperature and at the same time decreases the maximum cylinder temperature. Atmosphere protection against pollution on sea vessels covers one of the most important areas of human ecological activity which has its own history as well as some achievements. The most crucial ones include 73/78 MARPOL Convention (International Convention for the Prevention of Pollution from Ships) referring to prevention against marine environment pollution, and later amendments to the Convention with Annex VI (Regulation for the Prevention of Air Pollution from Ships) dealing with reducing the emission of nitric oxides and sulphur oxides into the atmosphere by sea vessels engines.
Źródło:
Journal of KONES; 2010, 17, 2; 505-510
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The issue of the atmosphere protection against toxic compounds gas emissions in maritime transport
Autorzy:
Witkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/242376.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
laboratory tests
supercharging air pressure
exhaust gas content
emission of nitric oxides
vessels propulsions
diesel engines
air humidification
Miller systems
Opis:
The paper discusses influence of the charging air parameters marine diesel engine on the emission toxic compounds in aspect of protecting the atmosphere against pollution from the sea vessels, pointed to the possibility of reducing NOx emissions by changing the parameters of charging air. In this group of activities undertaken to reduce nitric oxides emissions applied inter alia cooling the air and changes in pressure at the beginning of compression stroke. This is discussed in the background of normative acts, in particular the 73/78 MARPOL Convention (International Convention for the Prevention of Pollution from Ships) referring to prevention against marine environment pollution, and later amendments to the Convention with Annex VI (Regulation for the Prevention of Air Pollution from Ships) dealing with reducing the emission of nitric oxides and sulphur oxides into the atmosphere by sea vessels engines.It was also discussed the issue of air humidification as a method to reduce NOx by injecting hot water into a stream of pumped air. This is an overview on the example of two methods proposed for using in marine engines: CASS (Combustion Air Saturation System), HAM (Humid Air Motor system). The results of experimental tests of the influence of charging air pressure on content of exhaust gas, especially content nitric oxides (NOx), of ship diesel engine supplied with marine heavy fuel oil IF40 have been presented in this paper.
Źródło:
Journal of KONES; 2014, 21, 3; 293-300
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heat flow in a tube bank of a condenser considering the influence of air
Autorzy:
Joachimiak, M.
Joachimiak, D.
Krzyślak, P.
Powiązania:
https://bibliotekanauki.pl/articles/240202.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
condensation
inert gas
mass share of gas noncondensing in water vapor
Dalton’s law
water vapor pressure
air partial pressure
kondensacja
gaz obojętny
Prawo Daltona
ciśnienie pary wodnej
ciśnienie parcjalne
Opis:
The pressure of wet water vapor inside a condenser has a great impact on the efficiency of thermal cycle. The value of this pressure depends on the mass share of inert gases (air). The knowledge of the spots where the air accumulates allows its effective extraction from the condenser, thus improving the conditions of condensation. The condensation of water vapor with the share of inert gas in a model tube bank of a condenser has been analyzed in this paper. The models include a static pressure loss of the water vapor/air mixture and the resultant changes in the water vapor parameters. The mass share of air in water vapor was calculated using the Dalton’s law. The model includes changes of flow and thermodynamic parameters based on the partial pressure of water vapor utilizing programmed water vapor tables. In the description of the conditions of condensation the Nusselts theory was applied. The model allows for a deterioration of the heat flow conditions resulting from the presence of air. The paper contains calculations of the water vapor flow with the initial mass share of air in the range 0.2 to 1%. The results of calculations clearly show a great impact of the share of air on the flow conditions and the deterioration of the conditions of condensation. The data obtained through the model for a given air/water vapor mixture velocity upstream of the tube bank allow for identification of the spots where the air accumulates.
Źródło:
Archives of Thermodynamics; 2017, 38, 3; 119-134
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analyzis of the stream-air mixture during a flow through a tube bank inside a condenser
Autorzy:
Krzyślak, P.
Joachimiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/175261.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
condenser
pressure drop
steam-air mixture
water vapor condensation in a solution with air
partial pressure
Opis:
The paper presents the results of calculations related to the flow analysis of a tube bank taking into account the partial pressures of gases flowing through the condenser. Different mass share of the gas not condensing in the heat exchanger upstream to the first row of tubes and the partial pressures of water vapor and air have been taken into account. The value of the partial pressures of gases, pressures drop, temperature, velocity, Reynolds number, and air share in the subsequent rows of tubes have been calculated. This study is a basis for the analysis of heat exchange in the condenser considering the influence of the noncondensing gas. The increase in the share of air in the following rows of tubes results in an increase in the thermal resistance and condensation of increasingly lower mass of water vapor.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 131-140
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Empirical study of the effect of the air filter on the performance and exhaust emissions of a diesel engine
Autorzy:
Dziubak, Tadeusz
Karczewski, Mirosław
Dziobek, Ilona
Powiązania:
https://bibliotekanauki.pl/articles/24202461.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
internal combustion engine
air filter pressure drop
engine power
specific fuel consumption
exhaust emissions
silnik spalinowy
spadek ciśnienia w filtrze powietrza
moc silnika
jednostkowe zużycie paliwa
emisja spalin
Opis:
The results of an experimental study of the effect of the pressure drop of the air filter pf on the operating parameters and exhaust emissions of a modern CI internal combustion engine of a truck equipped with an electronically controlled power system are presented. The tests were carried out for an air filter with a clean filter cartridge Δpf0 = 0.58 kPa and with a cartridge contaminated after a service mileage (about 50 thousand km) ΔpfD = 2.024 kPa. In each test, engine performance, exhaust emissions and relative change in emissions were determined: CO, NOx, HC, CO2, H2O. It was found that an increase in the filter resistance pf causes a decrease in the filling degree by 12%, engine useful power by almost 10%, exhaust gas temperature by a maximum of 30oC and an increase in specific fuel consumption by almost 5%. Air filter resistance has no significant effect on NOx emissions and HC concentration. There is a reduction in H2O emissions by up to 7%, CO by up to 13% and CO2 by up to 4%, and an increase in oxygen emissions by 15%, depending on operating conditions.
Źródło:
Combustion Engines; 2023, 62, 2; 94--111
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Requirement of pressure relief dampers for clean rooms
Potrzeba stosowania klap nadciśnieniowych do pomieszczeń czystych
Autorzy:
Hrnková, Bronislava
Hečko, Dávid
Kapjor, Andrej
Mičko, Pavol
Vantúch, Martin
Powiązania:
https://bibliotekanauki.pl/articles/2055093.pdf
Data publikacji:
2021
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
clean room
pressure dampers
supply air
pressure drop
air diffusers
pomieszczenie czyste
klapy nadciśnieniowe
dopływ powietrza
spadek ciśnienia
dyfuzory
Opis:
The clean room is designed and used to minimize the entry, generation and deposition of pollutants. Proper flow control is an important factor in determining the efficiency of clean rooms. It is important that the air stream entrains from the space all the particles that are released when people move, but also from equipment and various materials. Therefore, in the following article we will deal with the need for pressure dampers in clean rooms.
Pomieszczenie czyste jest zaprojektowane i wykorzystywane w taki sposób, aby zminimalizować wnikanie, generowanie i osadzanie się zanieczyszczeń. Właściwa kontrola przepływu powietrza jest istotnym czynnikiem określającym efektywność pomieszczeń czystych. Ważne jest, żeby strumień powietrza porywał z przestrzeni wszystkie cząstki, które są uwalniane podczas ruchu ludzi, ale także ze sprzętu i różnych materiałów. W związku z powyższym w niniejszym artykule zajmiemy się potrzebą stosowania klap nadciśnieniowych w pomieszczeniach czystych.
Źródło:
Structure and Environment; 2021, 13, 2; 55--58
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure control in air cushions of the mobile platform
Autorzy:
Lisowski, E.
Filo, G.
Powiązania:
https://bibliotekanauki.pl/articles/242271.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
indoor transport
mobile platform
air cushions
pressure control
positioning
Opis:
In the industrial indoor transport various devices are used. Recently, the means of transport which use air cushions are more and more popular. Air cushions are particularly useful for transporting heavy loads and devices over the hardened, smooth floor. The air cushions can be directly put under the load. Then, the load is raised of the small height and displaced. The friction force between air cushion and the floor is very small. Therefore, the load can be moved by the operator. The other case of using air cushions in industrial transport is mobile platform with suitable number of air cushions instead of wheels. One of the most important problems in this case is adjustment of the transportation force in individual air cushion. An automatic control system of the transportation force has been proposed in this work. A mobile platform with four air cushions was considered. The pressure in each air cushion was regulated separately in the feedback loop. Two types of control algorithms have been investigated: the standard PID controller as well as the fuzzy logic controller. The investigations contained two cases of platform load. In the first case the load was distributed uniformly on the platform. In the second case load of two air pads was decreased and load of two other was increased. Construction of the platform, mathematical models of the controllers and results of investigations have been presented in the paper.
Źródło:
Journal of KONES; 2011, 18, 2; 261-270
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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