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Wyświetlanie 1-15 z 307
Tytuł:
Application of drones in protection of state border
Autorzy:
Adamski, M.
Mieżaniec, J.
Adamski, A.
Powiązania:
https://bibliotekanauki.pl/articles/242649.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Unmanned Aerial Vehicles
flying platform
drone
unmanned
UAV
Unmanned Aerial Vehicle
fly eye
Border Guard
operator
Opis:
An unmanned aerial vehicle is a flying apparatus that does not require a crewmember on board to complete a task. Its piloting is done by means of indirect control. UAVs also have the ability to perform autonomous flight on a pre-programmed flight path. The purpose of the study was to use the unmanned aircraft "Fly Eye" by WB Electronic used by the Border Guard to patrol the state border in 103 TRA zone on the section of the Republic of Poland with the Kaliningrad District of the Russian Federation. The TRA zones constitute a specially designated area for the use of the Border Guard and the army, in order to carry out flights there beyond the scope of the pattern for training purposes and to patrol the state border. The article also contains information of the Border Guard formation and the characteristics of the unmanned aerial vehicle “FlyEye”. In order to ensure the safety of the UAV flight, the test was carried out in the TRA zone, which is used for special use for the Border Guard formation and the army.
Źródło:
Journal of KONES; 2018, 25, 4; 9-15
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of construction materials in unmanned aerial vehicles
Autorzy:
Adamski, M.
Powiązania:
https://bibliotekanauki.pl/articles/245052.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Unmanned Aerial Vehicle
UAV
construction materials
material properties
Opis:
The design process is mostly connected with a proper selection of construction materials. Newly designed UAVs must undergo assessment in terms of performed tasks, range or fuel consumption. A significant influence upon the selection of materials, which are long lasting and resistant to damage, is exerted by the conditions of work of Unmanned Aerial Vehicles. They mainly execute their tasks at high altitudes with high speeds, where temperature and pressure differences may extensively damage not only the airframe skin, but also the equipment and the propulsion system itself. The aim of this study is to present the characteristics of materials currently used as well as their assessment in employed construction elements of UAVs. Polymer composites are superior to Al and Ti alloys, steel within the parameters of tensile strength and stiffness. As for the density gradient, polymer carbon fibre composites exceed glass fibre composites, also under cyclically variable loads. Glass fibre composites during tensile testing show higher values and a higher capability of absorbing energy under static and dynamic forces. Polymer matrix composites, reinforced with Kevlar, are less stiff than carbon-fibre composites, due to lower values of elasticity modulus, however they demonstrate higher impact load. Strength tests provide valuable data concerning the properties of a given material, such as tensile modulus E [MPa], tensile strength UTS [MPa], or resistance to high temperatures. It must be noted that these properties significantly affect the functioning of the airframe and its components.
Źródło:
Journal of KONES; 2016, 23, 3; 11-17
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie bezzałogowego statku powietrznego klasy Micro w misjach rozpoznawczych
The use of an unmanned aircraft Micro Class in exploratory missions
Autorzy:
Adamski, M.
Lorenc, W.
Nykaza, A.
Powiązania:
https://bibliotekanauki.pl/articles/310222.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
bezzałogowe statki powietrzne
BSP
rozpoznanie lotnicze
unmanned aircraft vehicle
UAV
air reconnaissance
Opis:
W artykule omówiono możliwości wykorzystania bezzałogowego statku powietrznego klasy Micro w różnego typu misjach rozpoznawczych. Rozpoznanie z powietrza jest najszybszym i najskuteczniejszym sposobem zdobywania informacji o przeciwniku. Dostarczone informacje, pozwalają na lepszą analizę pola walki, skuteczniejsze prowadzenie działań oraz lepsze wykorzystanie środków bojowych.
This article is about the possibility of using unmanned aircraft Micro class in various reconnaissance missions. Regugranting of the air is the fastest and most effective way to gain information about the enemy. Delivered informationsallow for better analysis of the battlefield, thus effectivelycarrying out activities and better use warfare agents.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 6; 47-49, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a UAV-based system for the semi-automatic estimation of the volume of earthworks
Autorzy:
Ajayi, Oluibukun G.
Oyeboade, Timothy O.
Samaila-Ija, Hassan A.
Adewale, Taiwo J.
Powiązania:
https://bibliotekanauki.pl/articles/1444927.pdf
Data publikacji:
2020
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
Unmanned Aerial Vehicle
earthworks
stockpile volume estimation
spatial data
Digital Elevation Model
bezzałogowy statek powietrzny
roboty ziemne
dane przestrzenne
cyfrowy model wysokości
Opis:
One of the challenges faced by surveyors in acquisition of accurate spatial data for mining applications is the risk involved in acquiring data in rugged terrains and difficult or inaccessible areas. With the advent of modern technology, accurate geospatial data can now be safely obtained for proper mining documentation periodically. The use of Unmanned Aerial Vehicles (UAVs) for data acquisition in mine surveying has been a viable means of obtaining reliable geospatial data rapidly and efficiently. The main goal of this study is to develop a semi-automatic UAV-based system for the acquisition of spatial data required for the estimation of the volume of earthworks. A DJI Phantom 4 quadcopter was used for the acquisition of image data of the project site, while the images were processed into a Digital Elevation Model (DEM) using Pix4Dmapper v2.0.1, which was then imported into the MATLAB-based system developed for the automatic estimation of the volume of earthworks. The volume obtained from the automated system was thus compared with the volume obtained directly from the Pix4Dmapper software, having specified a contour interval of 1 and an allowable error rate of ±3% as the standard error. While ±1.02% error was observed in the volume estimated using the Pix4Dmapper, the developed automated system yielded an estimated precision of ±0.81% in its volume estimation, which proves to be more robust for automatic volume estimation in terms of accuracy and precision.
Źródło:
Reports on Geodesy and Geoinformatics; 2020, 110; 21-28
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the applicability of unmanned aerial vehicles (uav) photogrammetry for the estimation of the volume of stockpiles
Autorzy:
Ajayi, Oluibukun Gbenga
Ajulo, John
Powiązania:
https://bibliotekanauki.pl/articles/1050771.pdf
Data publikacji:
2021-03-31
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
stockpiles
earthworks
volumetric computations
ground survey
UAV photogrammetry
Opis:
Accurately estimating the volume of earthworks is very important in mining engineering and construction. This estimation can be difficult because of the morphological condition of the stockpiles, hence, devising simpler, yet accurate methods of stockpile volume estimation is still a research problem in mining. Two non-invasive survey methods were compared in this research: the conventional ground-based and UAV-approach, for the survey of a twin-stockpile of gravel using Leica TS06 Total Station and DJI Mavic Air UAV, respectively. About 128 images of the area were acquired at 50 m flying height and 75% overlap during the flight mission. The images were processed using Agisoft Metashape Pro; a digital photogrammetric software, and the DEM obtained was used for the volume estimation. The total station data was also processed in ArcGIS to generate a TIN-model from which the volume was also estimated. The volume estimated from the TIN-model was compared with the volume estimated from the UAV-based DEM, using the volume obtained from the mill-machine as the standard. The obtained result shows that while 2750 m³ was obtained as the cumulative volume from the mill machine, the UAV approach yielded 2686.252 m³ and the ground survey approach gave 2830.713 m³. The percentage difference between the two methods compared to the actual volume is 2.94% and −2.31%, respectively. These results, and the result of the processing time analysis show that UAV approach is both accurate and time economical, which attests to the potentials of low-cost UAVs to provide robust alternative to the time-consuming and rigorous ground survey approach.
Źródło:
Quaestiones Geographicae; 2021, 40, 1; 25-38
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the applicability of integrated UAV photogrammetry and automatic feature extraction for cadastral mapping
Autorzy:
Ajayi, Oluibukun Gbenga
Oruma, Emmanuel
Powiązania:
https://bibliotekanauki.pl/articles/43852813.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
zarządzanie gruntami
segmentacja obrazu
mapowanie
land management
remote sensing applications
image segmentation
automatic boundary extraction
UAV mapping
Opis:
The applicability of integratedUnmannedAerialVehicle (UAV)-photogrammetry and automatic feature extraction for cadastral or property mapping was investigated in this research paper. Multi-resolution segmentation (MRS) algorithm was implemented on UAVgenerated orthomosaic for mapping and the findings were compared with the result obtained from conventional ground survey technique using Hi-Target Differential Global Positioning System (DGPS) receivers. The overlapping image pairs acquired with the aid of a DJI Mavic air quadcopter were processed into an orthomosaic using Agisoft metashape software while MRS algorithm was implemented for the automatic extraction of visible land boundaries and building footprints at different Scale Parameter (SPs) in eCognition developer software. The obtained result shows that the performance of MRS improves with an increase in SP, with optimal results obtained when the SP was set at 1000 (with completeness, correctness, and overall accuracy of 92%, 95%, and 88%, respectively) for the extraction of the building footprints. Apart from the conducted cost and time analysis which shows that the integrated approach is 2.5 times faster and 9 times cheaper than the conventional DGPS approach, the automatically extracted boundaries and area of land parcels were also compared with the survey plans produced using the ground survey approach (DGPS) and the result shows that about 99% of the automatically extracted spatial information of the properties fall within the range of acceptable accuracy. The obtained results proved that the integration of UAVphotogrammetry and automatic feature extraction is applicable in cadastral mapping and that it offers significant advantages in terms of project time and cost.
Źródło:
Advances in Geodesy and Geoinformation; 2022, 71, 1; art. no. e19, 2022
2720-7242
Pojawia się w:
Advances in Geodesy and Geoinformation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance evaluation of different selected UAV image processing software on building volume estimation
Autorzy:
Ajayi, Oluibukun Gbenga
Ogundele, Bolaji Saheed
Aleji, Gideon Abidem
Powiązania:
https://bibliotekanauki.pl/articles/43852779.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
budynek
bezzałogowy statek powietrzny (UAV)
modelowanie 3D
building information modelling
Unmanned Aerial Vehicle
UAV mapping
3D modelling
image processing software
Opis:
The aim of this research is to evaluate the performance of four UAV image processing software for the automatic estimation of volumes based on estimated volume accuracy, spatial accuracy, and execution time, with and without Ground Control Points (GCPs). A total of 52 images of a building were captured using a DJI Mavic Air UAV at 60m altitude and 80% forward and side overlap. The dataset was processed with and without GCPs using Pix4DMapper, Agisoft Metashape Pro, Reality Capture, and 3DF Zephyr. The UAV-based estimated volume generated from the software was compared with the true volume of the building generated from its as-built 3D building information modeled in Revit 2018 environment. The resulting percentage difference was computed. The average volumes estimated from the four software with the use of GCPs were 4757.448 m3 (3.87%), 4728.1 m3 (2.54%), 4291.561 m3 (11.5%), and 4154.938 m3 (14.35%), respectively. Similarly, when GCPs were not used for the image processing, average volumes of 4631.385 m3 (4.52%), 4773.025 m3 (1.6%), 4617.899 m3 (4.89%), and 4420.403 m3 (8.92%) were obtained in the same order. In addition to the volume estimation analysis, other parameters, including execution time, positional RMSE, and spatial resolution, were evaluated. Based on these parameters, Agisoft Metashape Pro proved to be more accurate, time-efficient, and reliable for volumetric estimations from UAV images compared to the other investigated software. The findings of this study can guide decision-making in selecting the appropriate software for UAV-based volume estimation in different applications.
Źródło:
Advances in Geodesy and Geoinformation; 2023, 72, 1; art. no. e39, 2023
2720-7242
Pojawia się w:
Advances in Geodesy and Geoinformation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Matlab Implementation of Differential GPS for Low-cost GPS Receivers
Autorzy:
Ali, Q
Montenegro, S.
Powiązania:
https://bibliotekanauki.pl/articles/116127.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
marine navigation
Global Positioning System GPS
Matlab, Differential GPS (DGPS)
GPS Receiver
unmanned aerial vehicle (UAV)
Global Navigation Satellite System (GNSS)
RINEX Format
Opis:
A number of public codes exist for GPS positioning and baseline determination in off-line mode. However, no software code exists for DGPS exploiting correction factors at base stations, without relying on double difference information. In order to accomplish it, a methodology is introduced in MATLAB environment for DGPS using C/A pseudoranges on single frequency L1 only to make it feasible for low-cost GPS receivers. Our base station is at accurately surveyed reference point. Pseudoranges and geometric ranges are compared at base station to compute the correction factors. These correction factors are then handed over to rover for all valid satellites observed during an epoch. The rover takes it into account for its own true position determination for corresponding epoch. In order to validate the proposed algorithm, our rover is also placed at a pre-determined location. The proposed code is an appropriate and simple to use tool for post-processing of GPS raw data for accurate position determination of a rover e.g. Unmanned Aerial Vehicle during post-mission analysis.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 343-350
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automated UAV to Survey and Monitor Ionising Radiation Levels in a Closed Environment
Autorzy:
Anand, R.
Harshith, Kumar M. B.
Raghavan, Anirudh
Maddara, Roopak
Anand, Prajna
Powiązania:
https://bibliotekanauki.pl/articles/2175938.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
unmanned aerial vehicle
indoor SLAM
sensor data
disaster management robot
path planning
obstacle avoidance
Opis:
Since tragedies caused by nuclear disasters are always a concern, it is essential that nuclear power plants be monitored on a regular basis for any irregularities in ionising radiation levels. Irrespective of leakage proof measures being deployed in the plant, ensuring the safety of these measures is necessary. Given this scenario, the present study proposes the usage of unmanned aerial vehicles (UAVs) to ensure that radiation levels in nuclear plants remain within safe limits. The UAV deployed will map the entire environment following a unique path planning algorithm and monitor the environment with an onboard radiation sensor. If any irregularities are detected, the positional coordinates are flagged, and the A* algorithm is implemented to generate the shortest path between the starting point, and the flagged coordinates, which are considered as the destination coordinates. The UAV is made to traverse the shortest path together with maintaining stability of the system while traversing.
Źródło:
Power Electronics and Drives; 2022, 7, 42; 134--145
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of aircraft position in the formation flight for the drag reduction
Autorzy:
Antczak, A.
Sibilski, K.
Powiązania:
https://bibliotekanauki.pl/articles/245259.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
UAV
formation flying
optimisation
dynamic of flight
aerodynamic
Opis:
This article presents optimisation of necessary flight thrust in a V-shaped flight formation of small-unmanned plane “Sikorka”. At the beginning is showed analyse of birds behaviour. Their formation flying was the cause of attention in order to minimalize fuel consumption. Afterwards there are overlooked scientific articles about the formation flying subject contain pure physic analyses, and articles about researches which was made in order to explain economic beneficial for airlines. Thus, the article presents mathematical model, which was optimised for three different starting position of a longitudinal axis. After optimisation there are presented results of the wingman position in regard of the leader. Influence of the calculation results on the formation flying was analysed, allowing for some conclusions about the future of the UAV’s flights. The given process is aimed to achieve the best (optimal) solution from the point of view of the specific criterion. The following most important terms can be distinguished within the optimization process: decisive variables – parameters determining the basic project assumptions. The basic design variables and design constrains are described.
Źródło:
Journal of KONES; 2018, 25, 3; 39-50
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
UAV Propulsion Analysis System with Reconfigurable Controller Feature
Autorzy:
Aszkowski, P.
Błoszyk, K.
Bondyra, A.
Gąsior, P.
Giernacki, W.
Powiązania:
https://bibliotekanauki.pl/articles/114456.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
dynamometer
BLDC motor
electric propulsion
coaxial multi-rotor
STM32 bootloader
Opis:
In this paper, a custom measuring system for propulsion units of multi-rotor UAV is presented. Designed solution provides measurements of thrust, rotational speed and power consumption of popular electric propulsion systems consisting of BLDC motor, electronic speed controller (ESC) and various propellers. The method is applicable to both single and twin (coaxial) configurations of rotors. Thanks to the use of a precision 6-axis force/torque sensor and sensorless method of speed measurement it is possible to record performance of propulsion with convenient PC software. The system is equipped with complete galvanic isolation between power and sensory circuits. A unique feature of presented solution is the possibility of remote reconfiguration of various controllers, governing speed or thrust of the propeller. Possible applications of the presented test rig are: estimating the performance of UAV design (flight time, power consumption, payload capabilities), mathematical modelling of electric propulsion and analysis of faulty states of rotor operation.
Źródło:
Measurement Automation Monitoring; 2017, 63, 5; 171-173
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Onboard visual tracking for UAV’S
Autorzy:
Bănică, Marian Valentin
Rădoi, Anamaria
Pârvu, Petrișor Valentin
Powiązania:
https://bibliotekanauki.pl/articles/198201.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
UAV
computer vision
tracking
wizja komputerowa
śledzenie
Opis:
Target tracking is one of the most common research themes in Computer vision. Ideally, a tracking algorithm will only once receive information about the target to be tracked and will be fast enough to identify the target in the remaining frames, including when its location changes substantially from one frame to another. In addition, if the target disappears from the area of interest, the algorithm should be able to re-identify the desired target. Target tracking was done using a drone with a Jetson TX2 computer onboard. The program runs at the drone level without the need for data processing on another device. Cameras were attached to the drones using a gimbal that maintains a fixed shooting angle. Target tracking was accomplished by placing it in the centre of the image with the drone constantly adjusting to keep the target properly framed. To start tracking, a human operator must fit the target he wishes to follow in a frame. The functionality of this system is excellent for remote monitoring of targets.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2019, 105; 35-48
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planowanie trasy bezzałogowego statku powietrznego podczas lotu nad terenem z przeszkodami
Unmanned aerial vehicle route planning in mountainous terrain with obstacles
Autorzy:
Basmadji, F. L.
Gruszecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/194614.pdf
Data publikacji:
2017
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
BSP
bezzałogowy statek powietrzny
planowanie trasy
omijanie przeszkód
UAV
unmanned aerial vehicle
path planning
obstacle avoidance
Opis:
Pomimo znacznych postępów w tematyce zwiększenia autonomiczności bezzałogowych obiektów latającego, pozostaje jeszcze wiele problemów do rozwiązania, jednym z nich to problem autonomicznego planowania trasy. Mimo iż ten problem jest obecnie przedmiotem badań licznych ośrodków badawczych na świecie, nadal jednak nie opracowano uniwersalnego sposobu planowania trasy, gdyż jest to związane nie tylko z właściwościami danego obiektu, ale również z realizowaną misją. W niniejszym artykule omówiono problem planowania trasy dla bezzałogowego statku powietrznego podczas lotu nad terenem z przeszkodami. Opracowany został algorytm do wyznaczania trasy uwzględniający ograniczenia nałożone przez właściwości obiektu latającego, ukształtowanie terenu, strefy zakazane oraz maksymalny dopuszczalny pułap lotu. Ponadto zaproponowano metodę poszukiwania quasi-optymalnej trajektorii w przypadku większej liczby przeszkód. Przeprowadzono szereg badań symulacyjnych weryfikujących poprawność działania opracowanego algorytmu.
Despite significant progress in the field of increasing the autonomy of unmanned aerial vehicles (UAVs), there are still a number of problems which needs to be solved. One of such example is the problem of autonomous path planning. In this paper, the problem of UAV path planning in mountainous terrain with obstacles has been discussed. AUAV path planning algorithm that takes into account limitations imposed by UAVs dynamics, terrain configuration, no-fly zones and the maximum allowable flight altitude has been developed. Furthermore, the method of searching for the quasi-optimal path in the case of multiple obstacles has been proposed. A series of simulation investigations to verify the correctness of developed algorithm have been carried out.
Źródło:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2017, z. 89 [295], 1; 5-17
0209-2689
2300-5211
Pojawia się w:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk Assessment of Using a Contactless Method for Railway Surface Inspection as Alternative for Staff Inspection of Infrastructure
Autorzy:
Batko, Michał
Konieczny, Jarosław
Butor, Anna
Powiązania:
https://bibliotekanauki.pl/articles/27311593.pdf
Data publikacji:
2023
Wydawca:
Instytut Kolejnictwa
Tematy:
staff
inspection
infrastructure
monitoring
UAV
Opis:
Railway infrastructure managers are obliged to check technical condition of infrastructure in order to maintain safe traffic. Usually this is done using conventional methods and tools or directly through the inspections made by the technical staff . Technological development which is currently being experienced indicates the availability of new measurement methods that can be used to monitor the condition of railway infrastructure. However, the introduction of new methods for monitoring the infrastructure is usually a change affecting safety, which requires an assessment of the significance of the change for the maintenance of the required level of railway traffic safety. The authors assessed the significance of the change in the method of infrastructure monitoring and related risk assessment as a result of the use of the contactless method of checking the railway surface as an alternative method to staff inspections. Additional control measures or preventive measures for potential threats have also been indicated.
Źródło:
Problemy Kolejnictwa; 2023, 198; 98--95
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 307

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