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Wyświetlanie 1-15 z 118
Tytuł:
Wpływ zmęczenia i znużenia robotnika na wydajność pracy przy ścince drzew mechaniczną piłą spalinową
The impact of worker tiredness and fatigue upon the efficiency of tree felling with power saws
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/811005.pdf
Data publikacji:
1968
Wydawca:
Polskie Towarzystwo Leśne
Źródło:
Sylwan; 1968, 112, 10
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relacje pomiędzy rodzajem wyuczonego zawodu właścicieli gospodarstw rolnych a wartością odtworzeniową parku maszynowego w gminie Proszowice
Relations between acquired profession of the farm owners and farm machinery depreciation value in Proszowice commune
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/239778.pdf
Data publikacji:
2006
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
gospodarstwo
uzbrojenie techniczne
wykształcenie
rolnik
analiza statystyczna
farm
technical equipment
education
statistical analysis
Opis:
Badania przeprowadzono na wybranej próbie gospodarstw gminy rolniczej Proszowice. Dotyczyły one oceny wzajemnych relacji oraz istotności różnic pomiędzy nasyceniem w środki techniczne gospodarstw a rodzajem wykształcenia ich właścicieli. Podzielono ich na dwie grupy: z wykształceniem rolniczym oraz innym. Uzyskane wyniki wykazują wysokie wartości odtworzeniowe parku maszynowego. Analiza wariancji wykazała istotnie wyższe wskaźniki wartości odtworzeniowej parku maszynowego w gospodarstwach zarządzanych przez właścicieli z wykształceniem rolniczym.
The study carried out on selected group of farms localized in agricultural commune Proszowice, dealt with the interrelations and significance of differences between farm equipment with technical means and kind of education acquired by the farm owners. They were divided into two groups: with agricultural and other education. According to obtained results the values of machinery depreciation were high. Analysis of variance showed higher indices of machinery depreciation values on the farms managed by the owners with agricultural education.
Źródło:
Problemy Inżynierii Rolniczej; 2006, R. 14, nr 4, 4; 57-62
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja wielokanałowego systemu rejestracji danych
A concept of a multi-channel data recording system
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/155831.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
FPGA
PXI
pomiar 3 fazowy
akwizycja danych
3-phase measurement
data acquisition
Opis:
Artykuł jest propozycją rozwiązania problemu budowy wielokanałowego szybkiego systemu akwizycji danych. System zaprojektowano, jako jednostkę monitującą, rejestrującą dane przez wiele godzin. Nowatorskie w tym podejściu jest zastosowanie 3 połączonych ze sobą systemów, FPGA, systemu czas rzeczywistego RT oraz komputer klasy PC. Połączenie to zapewniło dużą częstotliwość próbkowania, przy długim czas monitorowania danych. Zbudowano system, który umożliwia 8 kanałowy 16 bitowy pomiar z częstotliwością próbkowania 200Ksps.
The paper presents a device which is a solution to the problem of fast, long term, simultaneous measurements of energetic values. The system is designed for monitoring 3-phase voltage and current values of the tested load. It consists of tree autonomic devices: FPGA, a real - time platform and a PC computer. This rare combination enables recording fast-distortion signals caused by switching or failure of a part of the power network. This is possible by using high speed acquisition in FPGA. The measured signals are stored on a hard disk with support of a real time operating system. To simplify the user control, all system commands, indicators and preview of the measured signal are sent by a TCP-IP protocol to the PC computer used to control all processes. The introduction is presented in Section 1. The requirements and limitations of the project are specified in Section 2. The hardware used in the project is described in Section 3 divided in Subsection 3.1 which describes the industrial platform PXI and Subsection 3.2 presenting the FPGA data acquisition card. The IDE which was used to develop the system is described in Section 4. Section 5 deals with the work of the system and connection between the devices. Subsection 5.1 is focused on the operating system on PXI, Subsection 5.2 presents the idea of two operating systems, Subsection 5.3 describes the application on the acquisition FPGA - card, Subsection 5.4 presents the idea of a multi thread application of PXI and Subsection 5.5 describes the control-application on PC. In Section 6 there is presented an example of the measured signals. Section 7 contains the conclusions.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 11, 11; 1301-1303
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can information technology change attitude of the student in the teaching of mathematics?
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/121815.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
edukacja matematyczna
nauczanie matematyki
technologia informatyczna
kalkulator z wyświetlaczem graficznym
zadania matematyczne
mathematical education
teaching mathematics
information technology
graphic display calculator
mathematical tasks
Opis:
The article shows a specific example of extracurricular activities conducted in secondary school, how the graphing calculator helped the first class student in learning mathematics to solve a very difficult task (math problem): How many elements has the equation: a x = log a x. The article describes the reasoning and attitude of the student who voluntarily of his own accord, inspired by other students to experiment, putting, generalizing and verifying hypotheses coped with the solution of this task. It describes the impact of this teaching mean that triggered activity and aroused student’s interest with the task on the degree of knowledge and skills in mathematics, the student’s skills in the use of mathematical language, self-reliance in solving a mathematical problem.
Źródło:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2014, 19; 101-110
2450-9302
Pojawia się w:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stan i wykorzystanie parku maszynowego w gospodarstwach ekologicznych o zróżnicowanej powierzchni i strukturze użytków rolnych
Condition and use of a machinery park in ecological farms of a varied area and structure of arable lands
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/288135.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
gospodarstwo ekologiczne
powierzchnia
struktura gospodarstwa
wyposażenie maszyn
wykorzystanie maszyn
ecological farms
area
structure of farms
equipment machines
use of machines
Opis:
W pracy została podjęta próba oceny relacji pomiędzy wielkością gospodarstwa oraz strukturą produkcji roślinnej, a wielkością i wykorzystaniem parku maszynowego w wybranych 15-tu gospodarstwach ekologicznych. Gospodarstwa podzielono na 3 grupy obszarowe (do 5,0 ha; 5,01 do 10,0 ha oraz powyżej 10 ha UR). Badania przeprowadzono metodą wywiadu kierowanego. Wyniki badań wskazują, że będący w posiadaniu gospodarstw sprzęt techniczny jest, poza małymi wyjątkami, wykorzystywany w minimalnym stopniu. W znaczącym stopniu zróżnicowana jest liczba środków technicznych będących na stanie badanych gospodarstw. Zdecydowanie najmniej liczny jest stan maszyn w gospodarstwach najmniejszych. Dotyczy to zarówno średnich wartości dla gospodarstwa w obrębie grup asortymentowych, jak i liczby tych asortymentów. Porównując w tym aspekcie gospodarstwa w zakresie obszarowym 5,01 do 10,00 ha z gospodarstwami powyżej 10,00 ha (średnia ok. 15 ha UR), zauważyć można, że poza mobilnymi środkami energetycznymi i nielicznymi grupami maszyn, brak wyraźnej różnicy pomiędzy grupami obszarowymi. Będące na stanie gospodarstw najmniejszych maszyny nie dają możliwości stosowania pracooszczędnych, nowoczesnych technologii uprawy. Równocześnie maszyny te wykorzystywane są w stopniu niespełniającym nawet minimalnych kryteriów ekonomicznych.
Attempt to evaluate the relation between the farm size and its structure of plant production and the size and use of a machinery park in the selected fifteen ecological farms was made. The farms were divided into 3 area groups (up to 5.0 ha; 5.01 to 10.0 ha and over 10 ha of arable land). The research was carried out with the method of guided survey. The research results prove that technical equipment of farms is, with some exceptions used to the minimum extend. The number of technical means of the researched farms is varied considerably. The least numerous are machines in the smallest farms. It concerns both average values for farms within facility groups as well as the number of these facilities. Comparing farms in this aspect within the scope of area 5.01 to 10.00 ha with farms above 10.00 ha (average approx. 15 ha of arable lands) one may notice that besides mobile energy means and small groups of machines, there is no visible difference between area groups. Machines in the smallest farms do not give an opportunity to use work-saving, modern cultivation technologies. Simultaneously, these machines are used in a degree that does not meet even the minimum economic criteria.
Źródło:
Inżynieria Rolnicza; 2012, R. 16, nr 4, t. 1, 4, t. 1; 171-180
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stan i rozwój kadry naukowej w ośrodkach inżynierii rolniczej w Polsce w latach 2000-2005
Status and development of scientific staff in agricultural engineering centers in Poland in the years 2000-2005
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/289641.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
kadra naukowa
profesor
doktor habilitowany
doktor
polityka kadrowa
kadencja
scientific staff
professor
assistant professor
doctor
staff policy
term
Opis:
Artykuł zawiera dane liczbowe charakteryzujące stan kadry naukowo-badawczej i dydaktycznej krajowych ośrodków Inżynierii Rolniczej. W pracy porównano stan ilościowy doktorów, doktorów habilitowanych oraz profesorów tytularnych w zakresie nauk rolniczych oraz nauk technicznych w AR Kraków, AR Lublin, AR Poznań, AR Szczecin, AR Wrocław, SGGW Warszawa, UWM w Olsztynie oraz IBMER Warszawa.
The article includes figures characterizing the status of research and didactic staff in agricultural engineering centers of Poland. The paper compares the quantitative status of post-graduates, assistant professors and titular professors of agricultural and technical sciences at the AR of Krakow, AR of Dublin, AR of Poznań, AR of Szczecin, AR of Wrocław, SGGW Warsaw, UWM of Olsztyn and IBMER of Warsaw.
Źródło:
Inżynieria Rolnicza; 2006, R. 10, nr 11(86), 11(86); 57-68
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The ANN approximation of the CH4 combustion model : the mixture composition
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/246942.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
modeling
internal combustion engines
approximation
artificial neural network
combustion process
chemical species
Opis:
The calculation of the changing of the combustion mixture composition during the combustion process of the CH4 is presented of the paper. Correct calculation results of the mixture composition during the combustion process in combustion chambers of internal combustion engines is important to define the heat release calculation, modeling and simulation of the combustion phenomena. The paper presents results of calculations for the GriMech 3 kinetic mechanism of the methane combustion for different thermodynamic parameters and the composition of the combusted mixture. Results of the kinetic calculation of combustion process are qualitatively consistent with the data available in literature. The second purpose of research was the approximation of obtained results with the trained artificial neural network. Input data needed to approximate mole fractions of considered in the GriMech 3 mechanism combustion process chemical species consisted of 52 mole fractions of initial chemical species and temperature and pressure process. For all considered chemical species the mean square error did not exceed a value of 1-10-2 %, but the maximum error for a single value of 43 species excess even more than 100% of the value of mole fraction values taken from kinetic calculations. Single values of errors disqualify the neural network application for modeling of mole fractions of chemical species.
Źródło:
Journal of KONES; 2010, 17, 2; 233-240
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The ANN approximation of the CH4 combustion model : the heat release
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/246946.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
modelling
internal combustion engines
approximation
artificial neural network
combustion process
heat release
Opis:
The calculation of the heat release from the combustion process of the CH4 is presented of the paper. Correct calculation results of the heat released from combustion is important for design, modelling and testing phenomena in combustion chambers of internal combustion engines. The paper presents results of calculations for the kinetic mechanism of methane combustion GriMech 3 for different thermodynamic parameters and composition of the combusted mixture. The calculations were performed for all possible configurations of the variable temperaturę range from 1100K to 3600K, the variable pressure in the range of 2MPa to 5MPa, variable humidity of charged air from 10 to 30 grams of water per l kg of air and variable mole fractions of charge air. Results of the kinetic calculation of combustion process are qualitatively consistent with the data available in literature. The next stage of research was approximation of obtained results with the trained artificial neural network. Input data needed to approximate the energy of the combustion process consisted of 52 mole fractions of chemical species and temperature and pressure process. Approximation results have meant square error not exceeded 0.04% for the test data and 0.02% for the validation data. The maximum error for a single result was 1.9% compared to data obtained with chemical kinetic calculations.
Źródło:
Journal of KONES; 2010, 17, 2; 225-232
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory study on influence of air duct throttling on exhaust gas composition in marine four - stroke diesel engine
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/248050.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine diesel engine
exhaust gas composition
toxic emission
laboratory investigation
air duct throttling
Opis:
Presented paper shows results of laboratory tests on the relationship between the throttling of a cross area of an air intake duct and the composition of exhaust gas from the marine engine. The object of research is a laboratory four-stroke diesel engine, worked with a load from 50kW to 250kW at a constant speed. During the laboratory, tests over 50 parameters were measured of the engine with technical condition recognized as a “working properly” and with a simulated the air intake duct throttling. The simulation consisted of inserting the throttling flanges to the air intake duct before compressor, limiting duct cross-sectional area by 20% and 60% respectively. The results of laboratory research confirm that the effect of the air intake duct throttling on the engine thermodynamic parameters is clearly visible only at considerable throttling. In the case of measuring the composition of exhaust gas, both mole fractions and emissions of gaseous components markedly affected even at low throttling. For example, 20% throttling of the cross section of the air intake duct increase the mole fraction of carbon monoxide in exhaust gas almost 44% during working the engine with load equal to 250kW, and only 10% of the temperature after air cooler. Keep in mind that the temperature after air cooler was an engine parameter, which undergoes the greatest change during the simulation of that malfunction. The conclusion is that the results of measurements of the composition of exhaust gas may contain valuable diagnostic information about the technical condition of the air delivery to the engine system.
Źródło:
Journal of KONES; 2012, 19, 1; 191-198
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The theoretical study on influence of fuel injection pressure on combustion parameters of the marine 4-stroke engine
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/243749.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine engine
multidimensional model
combustion model
fuel injection pressure
CFD
Opis:
The manuscript presents the analysis of influence of fuel injection pressure on the combustion parameters of marine 4-stroke diesel engine. Analysis is based on computational fluid dynamic (CFD) model designed on the basis of the motion mesh of combustion chamber of the marine engine cylinder and air inlet and exhaust gas ducts. Presented model consists of models of fuel injection into combustion chamber, breaking-up and evaporation of the fuel, mixing with air and turbulent combustion with heat transfer to construction elements of the engine cylinder. Mentioned CFD model is validated according to boundary and initial conditions taken from direct measurements. The chosen research object is laboratory 4-stroke turbocharged Diesel engine with direct injection of the fuel and mechanically controlled of both cylinder valves and the injector. During the calculation the fuel dose, delivered into the engine cylinder was changed without any other changes in the initial and boundary conditions. This approach to the problem allows to the cause-effect analysis. The results of presented study are as follows: The increase of the fuel injection pressure causes the increase of fuel dose, delivered into the engine cylinder and the increase of intensity of both kinetic and diffusion stage of the combustion process. The result of this is the increase of pressure and temperature of the combustion and significant increase of the NOx fraction despite the decrease of the O2 content in the combustion chamber of the engine.
Źródło:
Journal of KONES; 2016, 23, 1; 161-168
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The NOx emission estimation by the artificial neural network: the analyze
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/244207.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
emission
NOx
nitric oxides
ANN
artificial neural network
perceptron
ship diesel engine
Opis:
The paper presents the preliminary investigations of nitric oxides (NOx) estimation from marine two-stroke engines. The Annex VI to Marpol Convention enforce to ship-owners necessity of periodical direct measurements of the NOx emission from the ship engines. It is very expensive procedure but with a low accuracy. Presented investigations show the possibility of estimation the NOx emission without direct measurements but using the artificial neural network (ANN). The paper presents method of choice the input data influenced on NOx emission and configuration of ANN and effects of calculations. The input data poses 15 parameters of engine working, influencing on NOx emission. The output data, necessary to learning the network, were NOx concentration in engine exhaust gases. We take into account two types of ANN; the 3-layer perceptron (MLP) with number of neurons in the hidden layer from 10 to 20 and the radial basis function neural network (RBF) with number of neurons in the hidden layer from 10 to 80. The input, validation and verification data was obtained from laboratory tests. After procedure of network configuration, the chosen ANN was learned by back propagation method. During this operation the weights of neurons were changed to minimize the root mean square error. We obtained ANN's, which allow us to estimate the NOx emission from laboratory engine with accuracy, comparable with Annex VI regulations.
Źródło:
Journal of KONES; 2008, 15, 2; 225-232
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal state simulation for cylinder of marine two stroke engine
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/244344.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine two-stroke engines
modelling
radiosity
heat transfer
Opis:
This paper deals with the modelling of heat flow through cylinder liner structural components of a two-stroke engine. Especially, I paid attention to simulating temperature distribution for the wet cylinder liner. Multidimensional equations for the transient heat conduction with the Dirichlet and Fourier boundary conditions have been applied. In particularly, local values for the convective and radiative heat transfer coefficients using the Fourier boundary conditions determined in space of cylinder volume are applied. In order to determine the temperature distribution for the considered space, the radiosity method is used. Simulation results have been presented in the form of a temperature field for cylinder liner structural components depending on the crankshaft position angle. Application of the iterative calculation method for solving differential equations of energy balance allowed me to use software easy to get. I carried out all iterative computations using MSEXCEL spreadsheet. This way, I could decrease the simulation cost significantly. The simplicity of such an approach allowed me to apply the obtained results for visualization of the conduction heat transfer phenomena occurring in a cylinder of working marine engine. The presented approach could be used for the development of ship machinery simulators as well.
Źródło:
Journal of KONES; 2007, 14, 4; 209-216
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ANN based evaluation of the NOx concentration in the exhaust gas of a marine two-stroke diesel engine
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/258708.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
artificial neural network
marine two-stroke engine
NOx concentration
Annex VI to Marpol Convention
Opis:
The article presents results of a study on the possible application of artificial neural networks (ANNs) to the evaluation of NOx concentration in the exhaust gas of a marine two-stroke Diesel engine. A concept is presented how to use the ANN as an alternative to direct measurements carried out on a ship at sea. Methods of proper ANN selection, configuration and training are presented. Also included are the results of laboratory tests, performed to obtain data for ANN training and tests, and the results obtained from modelling certain processes with the aid of selected ANNs. As a result of the performed investigations, an ANN was constructed and trained to calculate NOx concentration in the Diesel engine exhaust gas based on the engine operation parameters measured with an average error of 1.83% , and the fuel consumption measured with an average error of 1.12%.
Źródło:
Polish Maritime Research; 2009, 2; 60-66
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental study of emission and combustion characteristics of marine diesel engine with fuel injector malfunctions
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/260092.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine diesel engine
exhaust gas composition
toxic emission
laboratory investigation
fuel injector malfunctions
Opis:
The presented paper shows the results of the laboratory study on the relation between chosen malfunctions of a fuel injector and composition of exhaust gas from the marine engine. The object of research is a marine 3-cylinder, four-stroke, direct injection diesel engine with an intercooler system. The engine was loaded with a generator and supercharged. The generator was electrically connected to the water resistance. The engine operated with a load between 50 kW and 250 kW at a constant speed. The engine load and speed, parameters of the turbocharger, systems of cooling, fuelling, lubricating and air exchange, were measured. Fuel injection and combustion pressures in all cylinders of the engine were also recorded. Exhaust gas composition was recorded by using a electrochemical gas analyzer. Air pressure, temperature and humidity were also recorded. Emission characteristics of the engine were calculated according to ISO 8178 standard regulations. During the study the engine operated at the technical condition recognized as „working properly” and with simulated fuel injector malfunctions. Simulation of malfunctions consisted in the increasing and decreasing of fuel injector static opening pressure, decalibration of fuel injector holes and clogging 2 neighboring of 9 fuel injector holes on one of 3 engine cylinders.
Źródło:
Polish Maritime Research; 2016, 1; 77-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 118

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