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Wyświetlanie 1-15 z 22
Tytuł:
Determination Of Gas Mixture Components Using Fluctuation Enhanced Sensing And The LS-SVM Regression Algorithm
Autorzy:
Lentka, Ł.
Smulko, J. M.
Ionescu, R.
Granqvist, C. G.
Kish, L. B.
Powiązania:
https://bibliotekanauki.pl/articles/221708.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LS-SVM algorithm
resistance gas sensor
fluctuation enhanced sensing
gas detection
Opis:
This paper analyses the effectiveness of determining gas concentrations by using a prototype WO3 resistive gas sensor together with fluctuation enhanced sensing. We have earlier demonstrated that this method can determine the composition of a gas mixture by using only a single sensor. In the present study, we apply Least-Squares Support-Vector-Machine-based (LS-SVM-based) nonlinear regression to determine the gas concentration of each constituent in a mixture. We confirmed that the accuracy of the estimated gas concentration could be significantly improved by applying temperature change and ultraviolet irradiation of the WO3 layer. Fluctuation-enhanced sensing allowed us to predict the concentration of both component gases.
Źródło:
Metrology and Measurement Systems; 2015, 22, 3; 341-350
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nitrate reduction and nitrogen fixation in symbiotic association Rhizobium - legumes.
Autorzy:
Luciński, Robert
Polcyn, Władysław
Ratajczak, Lech
Powiązania:
https://bibliotekanauki.pl/articles/1043794.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
root nodules
nitrate reductase (NR)
dissimilatory nitrate reduction
nitrogenase
bacteroids
gas diffusion resistance
Opis:
The inhibitory effect of nitrate on nitrogenase activity in root nodules of legume plants has been known for a long time. The major factor inducing changes in nitrogenase activity is the concentration of free oxygen inside nodules. Oxygen availability in the infected zone of nodule is limited, among others, by the gas diffusion resistance in nodule cortex. The presence of nitrate may cause changes in the resistance to O2 diffusion. The aim of this paper is to review literature data concerning the effect of nitrate on the symbiotic association between rhizobia and legume plants, with special emphasis on nitrogenase activity. Recent advances indicate that symbiotic associations of Rhizobium strains characterized by a high nitrate reductase activity are less susceptible to inhibition by nitrate. A thesis may be put forward that dissimilatory nitrate reduction, catalyzed by bacteroid nitrate reductase, significantly facilitates the symbiotic function of bacteroids.
Źródło:
Acta Biochimica Polonica; 2002, 49, 2; 537-546
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Portable exhaled breath analyzer employing fluctuation-enhanced gas sensing method in resistive gas sensors
Autorzy:
Kwiatkowski, A.
Chludziński, T.
Smulko, J.
Powiązania:
https://bibliotekanauki.pl/articles/220591.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resistance gas sensor
fluctuation enhanced sensing
flicker noise
gas detection
breath sample collection
Opis:
This paper presents a portable exhaled breath analyser, developed to detect selected diseases. The set-up employs resistive gas sensors: commercial MEMS sensors and prototype gas sensors made of WO3 gas sensing layers doped with various metal ingredients. The set-up can modulate the gas sensors by applying UV light to induce physical changes of the gas sensing layers. The sensors are placed in a tiny gas chamber of a volume of about 22 ml. Breath samples can be either injected or blown into the gas chamber when an additional pump is used to select the last breath phase. DC resistance and resistance fluctuations of selected sensors using separate channels are recorded by an external data acquisition board. Low-noise amplifiers with a selected gain were used together with a necessary bias circuit. The set-up monitors other atmospheric parameters interacting with the responses of resistive gas sensors (humidity, temperature, atmospheric pressure). The recorded data may be further analysed to determine optimal detection methods.
Źródło:
Metrology and Measurement Systems; 2018, 25, 3; 551-560
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the results for calculation of vortex currents after sudden expansion of the pipe with different diameters
Autorzy:
Kholboev, B. M.
Navruzov, D. P.
Asrakulova, D. S.
Engalicheva, N. R.
Turemuratova, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/2174200.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fluktuacja prędkości
prąd wirowy
anizotropia turbulencji
two-fluid turbulence model
sudden expansion
velocity fluctuation
intensity of fluctuations
gas resistance
quasi-periodic regime
Opis:
In this work, a numerical study of a sharply expanding highly swirling flow is carried out using v2-f models based on the Comsol Multiphysics 5.6 software package and a two-fluid turbulence model. The results obtained are compared with known experimental data with different pipe diameters. The purpose of this work is to test the ability of models to describe anisotropic turbulence. It is shown that the two-fluid model is more suitable for studying such flows.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 115--123
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ osadów sadzy na opory przepływu spalin i wydajność parową kotła utylizacyjnego
Influence of Soot Deposits on Flow Resistance and Steam Capacity of an Exhaust Gas Boiler
Autorzy:
Behrendt, C.
Motornyj, A.
Powiązania:
https://bibliotekanauki.pl/articles/360745.pdf
Data publikacji:
2005
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
OMiUO 2005
kocioł utylizacyjny
wydajność parowa
opory przepływu
badania eksperymentalne
symulacja
exhaust gas boiler
steam capacity
gas flow resistance
experimental research
simulation
Opis:
Przedstawiono wpływ zanieczyszczenia osadami sadzy powierzchni wymiany ciepła wybranego kotła utylizacyjnego na jego wydajność parową i opory przepływu spalin. Otrzymane wyniki obliczeń symulacyjnych porównano z wynikami badań eksperymentalnych.
The paper demonstrates the influence of soot deposits on the heating surfaces of chosen exhaust gas boilers on the exhaust flow resistance and boiler capacity. The results of computer simulation were compared with experimental results.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2005, 5 (77); 39-46
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical Model of Gas, Powder and Bed Flow in Metallurgical Shaft Furnaces
Autorzy:
Panic, B.
Powiązania:
https://bibliotekanauki.pl/articles/353174.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mathematical modeling
metallurgical shaft furnace
system: descending packed bed - gas - powder
resistance of gas flow
bed suspension
Opis:
This paper presents the second phase of model investigations. In the first phase research into flow for the system “gas transporting powder - moving packed bed” was conducted in the physical modeling. The influence of bed, powder and gas parameters on values of interaction forces and phenomena occurring in investigated system was defined. The article discusses the successive stage of investigations into gas flow carrying the powder through the descending packed bed. The research was performed with the application of mathematical modeling after tests with a physical model in use had been accomplished. The elaborated mathematical model was used to calculate resistance values of gas flow carrying the powder through the descending packed bed, masses of ‘static’ and ‘dynamic’ powders as well as total mass of powder holdup in the bed. Then the verification of the model was done comparing the obtained results with those from the physical model.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 227-232
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustainability in the Supply Chain: reducing supply-chain greenhouse gas emissions in medium-sized businesses
Autorzy:
Stepan, John
Powiązania:
https://bibliotekanauki.pl/articles/529782.pdf
Data publikacji:
2013
Wydawca:
Wyższa Szkoła Bankowa we Wrocławiu
Tematy:
Medium Sized Businesses) greenhouse gas emission reduction resistance to sustainability issues
supply-chain / business operations improvement
role of higher education establishments
Opis:
Medium Sized Businesses (MSB’s) form a sizable part of the Polish and EU Business Environment with many of these companies operating in industrial / commercial sectors. Their aggregate Green-House Gas (GHG) impact is therefore significant. However, within MSB’s, there is a significant resistance to GHG / Sustainability issues. This paper presents ways in which MSB’s can be convinced that positive responses on GHG / Sustainability issues can provide sustained Business Benefits. It goes on to describe how the Academic Community can contribute to this process by assisting MSB’s to operate in a more environmentally sustained manner whilst at the same time gaining the advantages of concrete Business and Financial Operation benefits.
Źródło:
Central and Eastern European Journal of Management and Economics (CEEJME); 2013, 1, 1; 47-68
2353-9119
Pojawia się w:
Central and Eastern European Journal of Management and Economics (CEEJME)
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of the Nonsteady-State Filtration Process in a Fibrous Material in Conditions of Real Dust Loading
Autorzy:
Majchrzycka, K.
Powiązania:
https://bibliotekanauki.pl/articles/90344.pdf
Data publikacji:
2000
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
air filtration
fibrous filtering material
particular deposition
filtration efficiency
clogging test
gas flow resistance
model of nonsteady-state filtration
filtracja powietrza
materiał filtracyjny
skuteczność filtracji
opór przepływu gazu
Opis:
The study concerns ways to describe filtration efficiency and gas flow resistance while particles are deposited in fibrous respiratory protective filters under conditions characteristic for their use. The performance of fibrous filter materials of varied structure and electrostatic properties was studied, using polydisperse coarse-grained aerosols and submicron aerosols of sodium chloride. Evidence was found that changes in airflow resistance depended to a large extent on air humidity and the concentration of the aerosol. A relationship was also found between the electrostatic properties of filter media and their decreasing efficiency with time. A numerical model was developed to simulate the phenomenon of nonsteady-state filtration for 2 mechanisms of deposition, which permitted assessment of the filtration characteristics of filter media of any design and in any conditions.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2000, Zeszyt Specjalny; 45-58
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The thermoelastic state of a bi-material with an open gas-filled interface crack
Autorzy:
Serednytska, Khristina
Martynyak, Rostyslav
Chumak, Kostyantyn
Powiązania:
https://bibliotekanauki.pl/articles/280179.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
bi-material
interface crack
ideal gas
pressure
thermal resistance
Opis:
The thermoelastic behavior of a bi-material with a gas-filled interface crack is investigated. The bi-material is subjected to a uniform tensile load and a uniform heat flow. The gas exerts pressure on the crack surfaces and offers thermal resistance proportional to the crack opening. The gas state is assumed to be described by the ideal gas law. The effects of gas mass, gas thermal conductivity and heat flux on the crack opening, interface temperature jump, gas pressure and stress intensity factors are analyzed. It is revealed that a bi-material with a heat-conducting crack exhibits the heat flow directional effect.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 331-341
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anticorrosion Properties and Morphology of Phosphate Coating Formed on Nitrided Surface of 42CrMo4 Steel
Autorzy:
Kapuścińska, A.
Kwiatkowski, L.
Wach, P.
Mazurek, A.
Diduszko, R.
Powiązania:
https://bibliotekanauki.pl/articles/356565.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
corrosion resistance
phosphating
gas nitriding
γ' nitrides
ε nitrides
Opis:
The subject of the study concerns the enhancement of corrosion and wear resistance of nitrided 42CrMo4 steel by the formation of zinc phosphate top layer. The present work is aimed at the assessment of the effect of increasing thickness of nitrided layer from approximately 2 μm to 16 μm on the morphology and properties of zinc phosphate coating. XRD analysis showed that along with the increase in the thickness of the nitrides layer, a change in the phase composition was observed. SEM/EDS examination revealed that top layer consists of crystalline zinc phosphate coating. The shape and size of crystals does not significantly depend on a thickness of nitrides layer but corrosion resistance determined by potentiodynamic method in 0.5M NaCl increased with an increase of thickness of a “white layer”. Similarily the wear resistance determined by the 3-cone-roll test was also the highest for 16 μm nitride layer.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 471-477
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of Hydrodynamic Characteristics of Apparatus with Regular Tubular Packing
Autorzy:
Issayeva, Aikerim Nurlankyzy
Korganbayev, Bayrzhan Nogaybaevich
Volnenko, Alexandr Anatolevich
Zhumadullayev, Daulet Koshkarovich
Jumadillayeva, Gulzhamal Nurtazaevna
Powiązania:
https://bibliotekanauki.pl/articles/2069897.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
regular tubular packing
vortex interaction
local resistance
roughness
hydraulic resistance
retained liquid amount
gas content
Opis:
Among the apparatuses with a regular arrangement of packing elements creating an in-phase mode of vortex interaction, which ensures high efficiency of the processes, it is interesting to use a standard tubular packing. Such packing allows additional advantages associated with heat supply or extraction directly in the contact zone of the interacting phases, which is very important for conducting some chemisorption processes. The research covers such hydrodynamic regularities as hydraulic resistance during a heat carrier movement in pipes and during external flow around a tubular beam, retained liquid amount and gas content of layer in the external flow around the tubular beam with liquid and gas flows. The research was carried out using an experimental setup with a heat and mass transfer apparatus with regular tubular packing. The medium used during experiments is water-air. The research methodology included standard methods for determining hydraulic resistance and retained liquid amount and visual observation and photographing of gas-liquid flows. The novelty of the research was equations – one for calculating the hydraulic resistance in pipes, taking into account local resistances and pipe roughness. The other ones for determining the pressure losses during the external flow around the tubular beam, the retained liquid amount, and the gas content of the layer, taking into account the vortex interaction of gas and liquid flows. Graphical and calculated dependences of the investigated hydrodynamic characteristics were obtained as a result of the conducted research of the hydraulic resistance during the heat carrier movement in the pipes, as well as the hydraulic resistance and the retained liquid amount during the external flow around the tubular beam with a change in the gas velocity and irrigation density. When the heat carrier flows in the pipes, the numerical values of the hydraulic resistance in the transient mode do not exceed 1.5 kPa, in the developed turbulence mode in the range of the Reynolds number from 1·104 to 6·104 ΔР varies from 1.5 to 53 kPa. With the external flow around the tubular beam, in the developed turbulence mode wg = 4 m/s and L = 25 m3/m2h, the hydraulic resistance is 85 Pa, the retained liquid amount is 4.5·10-3 m. The change in the irrigation density in this mode (developed turbulence) in the L range from 10 to 100 m3/m2h leads to an increase in the hydraulic resistance from 65 to 160 Pa, the retained liquid amount from 2.16·10-3 to 13.6·10-3 m. The calculated dependencies are the basis of the method for calculating the hydrodynamic characteristics of the apparatus with the regular tubular packing, which can be used to calculate industrial devices.
Źródło:
Rocznik Ochrona Środowiska; 2021, 23; 868--882
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przetworniki rezystancyjne do pomiaru strumienia gazu
Resistance transducers for the measurement of gas flow
Autorzy:
Janiczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/152287.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
przetworniki pomiarowe
pomiar przepływu gazu
resistance transducers
gas flow measurement
Opis:
W artykule opisano przetworniki rezystancyjne do pomiaru przepływu gazów. Opisano procedury projektowania przetworników dla przepływu laminarnego i przeprowadzono porównania z przetwornikami z efektem turbulentnym.
This paper presents the resistance transducers for the gas flow measurement. The procedures of designing the transducers for laminar flow were described. Comparisons transducers with turbulent effect were conducted.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 9 bis, 9 bis; 458-461
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Properties of TiC/Ti Coatings Deposited by the Supersonic Cold Gas Spray Technique
Autorzy:
Kusiński, J.
Kac, S.
Kowalski, K.
Dosta, S.
Georgiou, E. P.
Garcia-Forgas, J.
Matteazzi, P.
Powiązania:
https://bibliotekanauki.pl/articles/356608.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cold gas spraying
Ti
TiC
CerMet coating
SEM
TEM
wear resistance
Opis:
Nanostructured, biocompatible, TiC/Ti Supersonic Cold Gas Sprayed coatings were deposited onto a Ti6Al4V alloy and their microstructure, wear resistance and hardness were investigated. The starting nanostructured powder, containing a varied mixture of Ti and TiC particles, was produced by high energy ball milling. Scanning and transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction were used for structural and chemical analyses of powder particles and coatings. Coatings, 250-350 μm thick, preserving the nanostructure and chemical powder composition, with low porosity and relatively high hardness (~850 HV), were obtained. These nanostructured TiC/Ti coatings exhibited better tribological properties than commonly used biomedical benchmark materials, due to an appropriate balance of hard and soft nano-phases.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 867-873
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikroprocesorowy system sterowania sensorami ze złączem USB
Microprocessor sensor controlling system with USB interface
Autorzy:
Kaczmarek, L.
Smulko, J.
Powiązania:
https://bibliotekanauki.pl/articles/266673.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
czujnik gazów
fluktuacje rezystancji
system mikroprocesorowy
gas sensor
resistance fluctuations
microprocessor system
Opis:
Zapotrzebowanie na detekcję gazów oraz zapachów wymaga konstruowania tanich urządzeń o coraz lepszej selektywności i czułości pomiarów. W pracy opisano taki układ pomiarowy, w którym zwiększenie selektywności oraz czułości uzyskano przez pomiar zjawisk fluktuacyjnych w rezystancyjnym czujniku gazów. Opisano sposób pomiaru, wybrany układ pomiarowy oraz projekt i realizację systemu mikroprocesorowego sterującego układem. W zakończeniu przedstawiono przykładowe wyniki pomiarów.
There is a huge demand on developing new methods of aroma and gases detection in medicine, military or food industry with high sensitivity and selectivity. For this reason, the new method was developed to recognize odors by analysis power spectrum density of resistance fluctuations within Taguchi gas sensor. Gas mixture concentration around the gas sensor influence resistance of gas sensor. In this paper, we focus on measurement and amplification of very low level noise signal. The microcontroller system which communicates with a personal computer by USB interface was described as well.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2010, 28; 73-76
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological Characteristic of Titanium Alloy Surface Layers Produced by Diode Laser Gas Nitriding
Autorzy:
Lisiecki, A.
Piwnik, J.
Powiązania:
https://bibliotekanauki.pl/articles/351668.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloys
laser gas nitriding
surface layer
wear resistance
ball-on-disk
Opis:
In order to improve the tribological properties of titanium alloy Ti6Al4V composite surface layers Ti/TiN were produced during laser surface gas nitriding by means of a novel high power direct diode laser with unique characteristics of the laser beam and a rectangular beam spot. Microstructure, surface topography and microhardness distribution across the surface layers were analyzed. Ball-on-disk tests were performed to evaluate and compare the wear and friction characteristics of surface layers nitrided at different process parameters, base metal of titanium alloy Ti6Al4V and also the commercially pure titanium. Results showed that under dry sliding condition the commercially pure titanium samples have the highest coefficient of friction about 0.45, compared to 0.36 of titanium alloy Ti6Al4V and 0.1-0.13 in a case of the laser gas nitrided surface layers. The volume loss of Ti6Al4V samples under such conditions is twice lower than in a case of pure titanium. On the other hand the composite surface layer characterized by the highest wear resistance showed almost 21 times lower volume loss during the ball-on-disk test, compared to Ti6Al4V samples.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 543-552
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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