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Tytuł:
Correction of determined coordinates of railway tracks in mobile satellite measurements
Korygowanie wyznaczonych współrzędnych osi toru kolejowego w mobilnych pomiarach satelitarnych
Autorzy:
Wilk, Andrzej
Specht, Cezary
Koc, Wladyslaw
Karwowski, Krzysztof
Skibicki, Jacek
Czaplewski, Krzysztof
Chrostowski, Piotr
Dabrowski, Pawel S.
Grulkowski, Sławomir
Judek, Slawomir
Specht, Mariusz
Szmagliński, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/328601.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
track geometric layout
GNSS/INS/MLS measurements
RTK measurements
data processing
układ geometryczny toru
pomiary GNSS/INS/MLS
pomiary mobilne RTK
przetwarzanie danych
Opis:
This article examines one of the basic issues related to the technique of mobile satellite measurements in railway tracks. This problem concerns the correction of the determined coordinates of the track centerline. The need to perform this operation results from the GNSS receivers positioning at a certain height above the level of the existing track axis, leading to longitudinal and lateral shifts of antennas. The key problem here is the determination of the local horizontal coordinate system in each measured position. For the analysis, the authors defined the directional baseline vector of the measuring platform on the basis of positions given by two satellite antennas, positioned over the pivots of its bogies. This work presents the procedure for determining the corrections values.
W pracy poruszono jedną z podstawowych kwestii związanych z techniką mobilnych pomiarów satelitarnych w torze kolejowym – korygowanie wyznaczonych współrzędnych osi toru. Konieczność przeprowadzenia tej operacji wynika z ustawienia anten GNSS na pewnej wysokości nad poziomem istniejącej osi toru, przy występowaniu jego pochylenia w kierunku podłużnym i poprzecznym. Kluczowym problemem staje się przy tym konieczność określania w każdym punkcie pomiarowym kierunków osi układu współrzędnych w płaszczyźnie poziomej. W omawianej metodzie posłużono się kierunkowym wektorem bazowym, wyznaczonym na podstawie współrzędnych anten usytuowanych nad czopami skrętów obydwu wózków platformy. W pracy przedstawiono procedurę określania wartości korekt.
Źródło:
Diagnostyka; 2020, 21, 3; 77-85
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of positioning methods using Global Navigation Satellite Systems (GNSS) in Polish State Railways (PKP)
Autorzy:
Specht, Mariusz
Szmagliński, Jacek
Specht, Cezary
Koc, Władysław
Wilk, Andrzej
Czaplewski, Krzysztof
Karwowski, Krzysztof
Dąbrowski, Paweł S.
Chrostowski, Piotr
Grulkowski, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/906101.pdf
Data publikacji:
2020
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
rail transport
global navigation satellite system (GNSS)
satellite receiver
European Train Control System (ETCS)
train positioning system
Polish State Railways (PKP)
Opis:
Each year, global navigation satellite systems (GNSS) improve their accuracy, availability, continuity, integrity, and reliability. Due to these continual improvements, the systems are increasingly used in various modes of transport, including rail transport, the subject of this publication. GNSS are used for rail passenger information, rail traffic management, and rail traffic control. These applications differ in the positioning requirements that satellite navigation systems must meet. This article presents the methods and systems of rolling stock location and tracking using the Polish State Railways (PKP) as an example. The information on the equipment used for train positioning is not specified anywhere, hence they may differ, even for the same multiple units travelling in different parts of the country. In addition, the publication presents the progress of the European Train Control System (ETCS) implementation by the PKP.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 62 (134); 26-35
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polish DGPS system: 1995–2017 – study of positioning accuracy
Autorzy:
Specht, Cezary
Smolarek, Leszek
Pawelski, Jan
Specht, Mariusz
Dąbrowski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/259085.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Polish DGPS system
positioning accuracy
position accuracy measures
Opis:
This paper is the fourth in a series of publications presenting the process of installation, testing and long-term assessment of the navigational parameters of the Polish DGPS system. This series of publications intends to present – to the general public – the accomplishments of teams of Polish scientists who have been working for years to make the DGPS the main positioning system used in the Polish sea areas. A considerable part of the materials presented in this paper has never been published. The article presents changes in the position accuracy of the Polish DGPS system over 20 years. Both dynamic tests performed on vessels as well as static measurements campaigns were analysed. The publication contains selected results achieved in its installation and testing in 1995–1997 supplemented with the results of studies conducted in the years: 2006, 2010, 2014, 2017. During this period the position accuracy increased from 2–8 m (1996) to approx. 1–2 m (2010) due to three reasons: turning – off the Selective Availability (2000), technical modernization of reference stations (2010) and continuous – over many years – reducing GPS signal-in-space pseudorange errors, which results in increased position accuracy in all GPS augmentation systems.
Źródło:
Polish Maritime Research; 2019, 2; 15-21
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining horizontal curvature of railway track axis in mobile satellite measurements
Autorzy:
Koc, Władysław
Wilk, Andrzej
Specht, Cezary
Karwowski, Krzysztof
Skibicki, Jacek
Czaplewski, Krzysztof
Judek, Sławomir
Chrostowski, Piotr
Szmagliński, Jacek
Dąbrowski, Paweł
Specht, Mariusz
Grulkowski, Sławomir
Licow, Roksana
Powiązania:
https://bibliotekanauki.pl/articles/2086882.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
GNSS measurements
railway track axis
horizontal curvature
moving chord method
application
accuracy assessment
pomiary GNSS
tor kolejowy
oś
krzywizna pozioma
metoda ruchomej cięciwy
zastosowanie
ocena dokładności
Opis:
The article discusses the applicability of a novel method to determine horizontal curvature of the railway track axis based on results of mobile satellite measurements. The method is based on inclination angle changes of a moving chord in the Cartesian coordinate system. In the presented case, the variant referred to as the method of two virtual chords is applied. It consists in maneuvering with only one GNSS (Global Navigation Satellite System) receiver. The assumptions of the novel method are formulated, and an assessment of its application in the performed campaign of mobile satellite measurements is presented. The shape of the measured railway axis is shown in the national spatial reference system PL-2000, and the speed of the measuring trolley during measurement is calculated based on the recorded coordinates. It has been observed that over the test section, the curvature ordinates differ from the expected waveform, which can be caused by disturbances of the measuring trolley trajectory. However, this problem can easily be overcome by filtering the measured track axis ordinates to obtain the correct shape – this refers to all track segments: straight sections, circular arcs and transition curves. The virtual chord method can also constitute the basis for assessing the quality of the recorded satellite signal. The performed analysis has shown high accuracy of the measuring process.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139204, 1--10
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abenomics and Its Impact on The Economy of Japan
Autorzy:
Grabowiecki, Jerzy
Mariusz, Dąbrowski
Powiązania:
https://bibliotekanauki.pl/articles/429847.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
abenomics
deflation
economic policy
GDP
Japan
monetary policy
Tankan
Opis:
Japanese economy is one of the largest economies in the world, but its share in the global GDP is decreasing steadily. Relative weakness is caused by both internal and external factors. Internal factors derive from a socio-economic model that was successful after World War II, but became less effective in the 21st century. On the other hand, external factors include: the growing competition from China and South Korea (the countries that initially emulated the Japanese model) and also the impact of natural disasters, which after several decades of relative seismic calm, have increasingly begun to affect the weakened economy of the Land of the Rising Sun. In addition, companies of the Silicon Valley have emerged on the market. When the software era arrived, Japan was still stuck to the production of hardware. In the face of the aforementioned challenges, successive governments in Tokyo have tried to break the unfavorable trend, which usually ended up with growing the public debt only. At the turn of 2012 and 2013 Shinzō Abe, an experienced politician, became the head of the Japanese government and announced a reform program named after his name – abenomics. The purpose of this article is the attempt to evaluate this program from the perspective of over four years from the time of its announcement.
Źródło:
Optimum. Economic Studies; 2017, 5(89)
1506-7637
Pojawia się w:
Optimum. Economic Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Installation of GNSS receivers on a mobile railway platform – methodology and measurement aspects
Autorzy:
Dąbrowski, Paweł S.
Specht, Cezary
Koc, Władysław
Wilk, Andrzej
Czaplewski, Krzysztof
Karwowski, Krzysztof
Specht, Mariusz
Chrostowski, Piotr
Szmagliński, Jacek
Grulkowski, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/135238.pdf
Data publikacji:
2019
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
BRIK
GNSS
railway measurements
railway track
railway track axis
staking out
electronic total station
Opis:
Determining the course of a railway track axis using satellite methods relies on ensuring the precise assembly of GNSS receivers in dedicated measuring devices. Depending on the number of receivers, solutions that are based on placing the apparatus directly above the railway track axis (as well as in eccentric positions) are used to indirectly obtain data to form the basis of the desired results. This publication describes the installation of five GNSS receivers on a mobile measuring platform as part of the InnoSatTrack project. The methodology and the procedure of the geodetic measurements required to obtain the geometrical configuration of the measuring apparatus, specified in the technical project, are presented. The publication presents the principles of total station measurement methods as well as the steps taken to achieve precise results from staking out. The process of acquiring the same configuration of the GNSS receivers, based on the geometry of the squares on the two measuring platforms that were used in the research, has been shown. The final determination of the position of the receivers did not exceed an error of 0.010 m with an average error of 0.003 m, despite the occurrence of mounting difficulties. The results have demonstrated the high credibility and effectiveness of the presented solution.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 60 (132); 18-26
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Association between insulin therapy and quality of life in diabetes
Autorzy:
Dąbrowski, Mariusz
Filip, Wioleta
Huc, Beata
Powiązania:
https://bibliotekanauki.pl/articles/972727.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
diabetes
insulin therapy
quality of life
SF-36 v.2 questionnaire
WHOQOL-BREF questionnaire
Opis:
Introduction. Diabetes is associated with a lower quality of life (QoL). Insulin therapy is perceived as an additional factor affecting QoL. The objective of this study, using standardized tools, was to evaluate to what extent insulin treatment has an effect on QoL in diabetes. Materials and method. 60 diabetic patients treated with insulin and 90 with oral drugs, all aged over 30, were included into the study. To assess the QoL of patients, SF-36 v.2 and WHOQOL-BREF questionnaires were used. In addition, demographic data were collected. Results. Insulin treated patients had a significantly lower Mental Component Score in SF-36 v.2 questionnaire. No significant differences between the two groups were found in the components of physical domain of SF-36 v.2 and in four domains of WHOQOL-BREF questionnaires. Insulin therapy was significantly associated with lower educational level. The strongest association with QoL in both questionnaires was found for professional activity and age. Conclusions. The results of this study indicate the need for psychological support for patients with diabetes treated with insulin to improve their mental coping. Diabetic patients should also be advised to continue their professional activity for as long as possible due to its important role in maintaining QoL.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2017, 11, 1; 10-14
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bezpieczeństwo pracy i ergonomia podczas łączenia elementów statków powietrznych
Occupational safety and ergonomics in aircraft assembly
Autorzy:
Dąbrowski, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/957843.pdf
Data publikacji:
2019
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
przemysł lotniczy
łączenie materiałów
bezpieczeństwo pracy
ergonomia
zagrożenia
aircraft industry
joining materials
occupational safety
ergonomics
hazards
Opis:
W artykule przedstawiono specyficzne problemy bezpieczeństwa pracy i ergonomii występujące w procesach łączenia struktur statków powietrznych. Wielu pracowników w przemyśle lotniczym w Polsce uczestniczy w procesach łączenia materiałów za pomocą nitowania, klejenia lub zgrzewania. W artykule opisano typowe wypadki przy tych pracach i omówiono charakterystyczne zagrożenia i uciążliwości występujące przy wykorzystaniu różnych technologii łączenia stosowanych w przemyśle lotniczym. W artykule podano także przykłady wyposażenia pracy oraz działań prewencyjnych służących poprawie komfortu pracy podejmowanych w istniejących uwarunkowaniach prawnych i techniczno-organizacyjnych.
The article presents particular problems of occupational safety and ergonomics in aircraft assembly. Many employees in the aircraft industry in Poland participate in processes of joining materials by riveting, gluing or welding. The article describes typical accidents that may happen during such works and discusses distinctive risks and strenuousness present during application of different technologies of aircraft assembly. The article also provides examples of work equipment and prevention measures for improvement of safety and comfort at work undertaken in the existing legal and technical-organizational conditions.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2019, 4; 18-21
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infuence of HbA1c, serum lipids, blood pressure and BMI on Auditory Brainstem Response in diabetic patients
Autorzy:
Dąbrowski, Mariusz
Mielnik-Niedzielska, Grażyna
Nowakowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/454729.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
auditory brainstem response diabetes mellitus
serum lipids
Opis:
Introduction. Impaired hearing organ function including abnormalities in auditory brainstem response (ABR) are more frequent in diabetic subjects compared to the general population. The aim of our study was to assess the impact of selected modifiable factors on ABR latencies in diabetic subjects. Material and Methods. 58 patients with type 1 and type 2 diabetes, aged <45 years, with diabetes duration <10 years, and without clinically overt hearing impairment or diabetic neuropathy, were included. In all subjects vital signs and blood samples were obtained, and ABR audiometry was performed. Results. Significantly delayed latencies in ABR were found in patients with total cholesterol <192 mg/dL, with HDL-cholesterol <49.5 mg/dL, with triglycerides >89 mg/dL, with presence of hypertension, and with systolic and diastolic blood pressure >135 and >78 mm Hg respectively. A linear correlation between triglycerides and wave I and III latencies, and between systolic blood pressure and wave III latency were revealed. A relationship between ABR latencies and HbA1c, LDL-cholesterol or BMI was not found. Conclusions. Several modifiable factors affect functioning of the retrocochlear part of the auditory pathway. If these results were confirmed in further studies, a vast area of possible therapeutic interventions to preserve hearing function in diabetic patients would become available.
Źródło:
European Journal of Clinical and Experimental Medicine; 2017, 3; 185-191
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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