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Wyświetlanie 1-15 z 1171
Tytuł:
Utilisation of free tacheometric stations in monitoring of monumental objects
Autorzy:
Malarski, R.
Nagórski, K.
Powiązania:
https://bibliotekanauki.pl/articles/225649.pdf
Data publikacji:
2011
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
measurements
tacheometric
Opis:
This paper presents results of investigations concerning utilisation of free tacheometric stations for: a) Determination of slip of objects located on escarpments, b) Investigations of deformations of bodies of monumental objects. The usefulness of the proposed technology of surveys for implementation of the above tasks has been proved. Results of investigations have been illustrated by results of surveys of displacements and deformations of the St.Ann’s Academic Church in Warszawa.
Źródło:
Reports on Geodesy; 2011, z. 1/90; 271-278
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
RTK/GPS water level determination during Lake Kamienne bathymetric measurements
Autorzy:
Popielaczyk, D.
Templin, T.
Powiązania:
https://bibliotekanauki.pl/articles/224617.pdf
Data publikacji:
2011
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
bathymetric measurements
RTK measurements
pomiary batymetryczne
pomiary RTK
Opis:
The paper presents application of real time RTK/GPS positioning technique for determination of water level changes during bathymetric measurements on Lake Kamienne – the upper water reservoir of the Pumped-Storage Power Station in Żydowo. The bathymetric measurements were carried out on the bases of GPS/RTK satellite positioning using the Ashtech X-Treme receivers while hydroacoustic sounding was conducted using the Simrad EA501P single beam hydroacoustic system. The article describes the basic stages of the work and methods for water level determination during bathymetric surveys.
Źródło:
Reports on Geodesy; 2011, z. 1/90; 391-396
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of a Raman scattering analyzer for the determination of natural gas composition at a processing plant
Autorzy:
Włodek, T.
Kuczyński, Sz.
Smulski, R.
Polański, K.
Powiązania:
https://bibliotekanauki.pl/articles/298597.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Raman spectroscopy
natural gas measurements
quantitative measurements
qualitative measurements
measurement technical assumptions
composition analysis
Opis:
The development of conventional and unconventional natural gas reservoir management includes continuous monitoring of hydrocarbon exploitation processes and its impact on the reservoir and environment. Raman spectroscopy, which allows for the identification of reservoir fluids (including natural gas) components can be a very promising method for the application of providing a quick, non-invasive, nondestructive analysis. The proposed in this paper measurement methods are focused on the use of:– a laboratory cell (autoclave) with sapphire window mounted on a specially prepared bypass pipeline;– a dedicated Raman probe mounted to the available installed stub pipe;– the construction of a special measurement cell. The article presents the basic technical assumptions for measurements of the composition of natural gas with the use Raman spectroscopy.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 3; 619-627
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations and measurements of torque and inductance of switched reluctance motors with laminated and composite magnetic cores
Autorzy:
Przybylski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2042786.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electromagnetic torque measurements
inductance measurements
simulations
switched reluctance motors
Opis:
The performance of drives with switched reluctance motors (SRMs) depends on magnetic materials used in their construction which influence static parameters such as inductance and electromagnetic torque profiles. The paper deals with simulations of switched reluctance motors in the finite element method and their comparison with measurements. Two kinds of switched reluctance motors were analysed, the modified Emerson Electric motor with a laminated steel core and a prototype, the one with a magnetic core made of iron-based powder composite materials. In the first part of the research, magnetization curves of magnetic materials were measured for static and dynamic conditions with 50 Hz. Next, simulations and measurements of inductance and developed torque were compared and analysed. In the last part of the research, simulations of magnetic flux density in motors were conducted. As the result of the research, it occurred that the simulations and measurements are quite close and two kinds of motors exhibit similar performance.
Źródło:
Archives of Electrical Engineering; 2022, 71, 1; 125-138
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of inclinometer measurements for relative horizontal displacement investigations on landslide grounds
Autorzy:
Malarski, R.
Nagórski, K.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/225439.pdf
Data publikacji:
2013
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
displacement measurements
inclinometric measurements
monitoring
pomiary przemieszczenia
pomiary inklinometrzyczne
Opis:
One of the basic criterion for safety evaluation of structures erected on embankment or sliding slopes is relative horizontal displacement at different elevations. Relative horizontal displacements beneath ground surfaces are performed with inclinometer measurements. This report presents results on horizontal relative ground displacements with the probe SISGEO S242SV30. Investigations were performed with two inclinometer columns 14m height embedded in Warsaw Bank Slope. Mean square error of single observation was determined and mean relative errors of relative displacements in relation to column height. On the basis measurement results several relevant recommendations and practical hints were formulated allowing to avoid survey blunders and discrepancies in measuring procedures often encountered. Detailed inclinometer horizontal displacement measurements results at Warsaw hillside St Ana’s Church grounds were listed and presented.
Źródło:
Reports on Geodesy; 2013, z. 1/94; 6-13
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 2-Port, Space-Saving, Maintenance-Friendly Pneumatic Probe for Velocity Measurements
Autorzy:
Olczyk, A.
Magiera, R.
Kabalyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/221299.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pneumatic probes
probe calibration
uncertainty of measurements
velocity measurements
Opis:
This paper presents the concept, design and experimental results of tests, in laboratory conditions, of a 2-port, space-saving pneumatic probe. The main features of the probe are a result of restrictions imposed by the functioning environment: a limited space for probe installation, the possibility of processing only two output signals and requirements for simplicity and reliability of the probe. A cylindrical shape of the probe tip is proposed as a general concept, similar to the classic, cylindrical, 3-port probe. The main difference arises in using only two pressure signals: one from the overpressure zone on the front side of the cylinder and another, from the underpressure zone on the back side. After performing an appropriate calibration procedure, it is possible to measure the flow velocity and correct the pressure difference obtained by means of a velocity coefficient kv. This paper also presents an analysis of the kv coefficient uncertainty to evaluate the quality of measurements.
Źródło:
Metrology and Measurement Systems; 2018, 25, 1; 171-185
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rotation and twist measurement using tilted fibre Bragg gratings
Autorzy:
Kisała, P.
Skorupski, K.
Cięszczyk, S.
Panas, P.
Klimek, J.
Powiązania:
https://bibliotekanauki.pl/articles/221822.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photonic sensors
fibre Bragg gratings
twist measurements
rotation measurements
Opis:
The paper presents a method of measuring the angle of rotation and twist using a tilted fibre Bragg grating (TFBG) periodic structure with a tilt angle of 6°, written into a single-mode optical fibre. It has been shown that the rotation of the sensor by 180° causes a change in the transmission coefficient from 0.5 to 0.84 at a wavelength of 1541.2 nm. As a result of measurements it was determined that the highest sensitivity can be obtained for angles from 30° to 70° in relation to the basic orientation. The change in the transmission spectrum occurs for cladding modes that change their intensity with the change in the polarization of light propagating through the grating. The same structure can also be used to measure the twist angle. The possibility of obtaining a TFBG twist by 200° over a length of 10 mm has been proved. This makes it possible to monitor both the angle of rotation and the twist of an optical fibre with the fabricated TFBG.
Źródło:
Metrology and Measurement Systems; 2018, 25, 3; 429-440
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of nonlinear constants from results of acoustic measurements. Regularization of problem
Autorzy:
Leble, S. B.
Vereshchagin, D. A.
Vereshchagina, I. S.
Powiązania:
https://bibliotekanauki.pl/articles/332067.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
acoustic measurements
regularization
Opis:
The method of nonlinear constants B/A and C/A determination is discussed. It bases on comparison of experimental results of acoustic signal propagation with results of theoretical investigation of this problem. It is shown, that this problem, in general case, is ill-posed. So we use methods of ill-posed problem solution regularization. The values of the constants, which were extracted using this method, are in good accordance with estimations by other authors.
Źródło:
Hydroacoustics; 2003, 6; 159-166
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchronous measurement of position coordinates of two GPS receivers
Autorzy:
Banachowicz, A.
Bober, R.
Szewczuk, T.
Wolski, A.
Powiązania:
https://bibliotekanauki.pl/articles/225117.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
pomiary
DGPS
measurements
Opis:
This article presents the results of synchronous DGPS measurements. The measurements involved two identical receivers with the same software, installed permanently at a fixed distance between each other, in conditions eliminating multipath signal reception. The results analysis, however, shows that the compatibility of received satellite configurations ranges significantly.
Źródło:
Reports on Geodesy; 2008, z. 1/84; 99-104
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of network reliability analysis based on accuracy characteristics
Autorzy:
Łapiński, S.
Powiązania:
https://bibliotekanauki.pl/articles/225644.pdf
Data publikacji:
2011
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
pomiary geodezyjne
measurements
Opis:
Measurements of structures must be precise and accurate as they affect the quality of the final result of geodetic tasks. In some cases there is a risk of committing a gross error. Diagnostic analyses may allow such an observation in to the adjustment and estimation of unknown parameters. The paper presents results of network deformation and robustness analysis based on the characteristics of network accuracy and reliability. The maximum undetectable error that may occur in an individual observation constitutes the source of deformation. The method tested in the present paper is proposed in Prószyński and Parzyński (2009). The paper evaluates theoretical relationships and their utility for analyses of large geodetic networks. Additionally, the paper attempts to transfer the presented relationships to the case of free adjustment, which was not included in theoretical derivations in the paper mentioned above. The research has been conducted using a computer generated 2D linear-angular network. The analysis focuses on the results of network deformation, depending on the assumed reference system. Moreover, an attempt has been made to modify the proposed method of network reliability analysis for the case of free adjustment.
Źródło:
Reports on Geodesy; 2011, z. 1/90; 265-270
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Matlab Package for External Local Calibration of IR Camera with Microbolometric FPA Detector
Autorzy:
Kruczek, T.
Adamczyk, W.
Kruczek, G.
Powiązania:
https://bibliotekanauki.pl/articles/114419.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermovision infrared measurements
improvement of accuracy of infrared camera measurements
Opis:
This work presents the method of improving the accuracy of temperature measurement results obtained by means of long-wave infrared camera equipped with focal plane array (FPA) detector. The typical accuracy of infrared cameras specified by their manufacturers amounts to ±2 K or ±2% of the measured value of temperature. Very often a better accuracy of the measurements is required, e.g. during the measurements of human body temperature. To improve the measurement accuracy an external local (in terms of temperature range) correction of obtained results on the basis of comparison measurement results of black body temperature and next with use of MATLAB package has been proposed.
Źródło:
Measurement Automation Monitoring; 2016, 62, 10; 337-340
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation of body proportions during the period of growth of Trematomus (Pisces; Nototheniidae) bernacchii Boul.
Autorzy:
Wróblewski, Ryszard J.
Powiązania:
https://bibliotekanauki.pl/articles/2057659.pdf
Data publikacji:
1982
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic ichthyology
taxonomic measurements
Źródło:
Polish Polar Research; 1982, 3, 1-2; 69-79
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accelerometer - Based Measurements of Axial Tilt
Autorzy:
Łuczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/384680.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
MEMS
accelerometer
tilt
measurements
Opis:
The paper deals with a specific type of tilt measurements, where an axial tilt is to be determined. The measurements are realized by means of accelerometers - MEMS devices most preferably. Various mathematical relations between the axial tilt and the Cartesian components of the gravitational acceleration are presented. Each relation is described in detail, especially in the terms of the resultant uncertainty of the measurement, as well as the requirements regarding the employed accelerometers. Results of experimental studies realized by means of commercial MEMS accelerometers are presented and discussed, especially with regard to the measurement accuracy that has been evaluated for each mathematical relation. Scope of application of each relation is proposed.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 39-41
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy analysis of GPS sport receivers in dynamic measurements
Autorzy:
Specht, M.
Szot, T.
Powiązania:
https://bibliotekanauki.pl/articles/320899.pdf
Data publikacji:
2012
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
GPS
sport measurements
accuracy
Opis:
Producers of GPS receivers nowadays offer many easy-to-use, mobile units for amateur and professional athletes. Similar functionality parameters and a relatively low price make it difficult for the average user to make a choice. This article compares technical aspects of different GPS devices and presents results of their dynamic accuracy evaluation. Selected GNSS units were divided into two groups: specialized dedicated to sports and GPS data loggers. The tests were carried out on the sports stadium of the Gdansk University of Physical Education and Sport, where the lanes were measured with the use of the GPS Total Station phase receivers Leica GS-15 VIVA, supported by Polish Active Geodetic Network ASG-EUPOS. The ellipsoidal coordinates logged in the GNSS sports receivers were transformed in Gauss-Kruger projection to conformal x, y coordinates and statistical distributions of the predictable accuracy were calculated. The article also discusses other (important from a functional point of view) characteristics of GPS receivers used by athletes.
Źródło:
Annual of Navigation; 2012, No. 19, part 1; 165-176
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Large data sets and their study using Douglas-Peucker method
Autorzy:
Błaszczak, W.
Kamiński, W.
Powiązania:
https://bibliotekanauki.pl/articles/224789.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geodezja
pomiary
geodesy
measurements
Opis:
Technological progress in measurement automation in geodesy creates new interesting research problems. One of them is an existance of excessive observational data sets. That means the new technologies produce large data sets. such data stes may cause problems for users, since they create heavy processing load. Their uploading to suitable software and subsequent processing is very time consuming. Thus, there is a need to resample and reorganize the data sets before processing, in order to considerable reduce their amount without loosing essential information. In the article, Douglas-Peuckesr method was used to reduce the size of the data sets. The proposed algorithm was applied and tested on a fragment of the data set containing results of Świnoujście-Szczecin Channel bottom mesurements. Based on ststistical analysis presented in the paper, a set of parameters can also serve as an initial information for another study.
Źródło:
Reports on Geodesy; 2006, z. 2/77; 69-74
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1171

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