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    Wyświetlanie 1-12 z 12
    Tytuł:
    Equations defining reducible Kummer surfaces in ℙ⁵
    Autorzy:
    Szemberg, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1311245.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    Kummer surfaces
    intersections of quadrics
    Opis:
    Principally polarized abelian surfaces are the Jacobians of smooth genus 2 curves or of stable genus 2 curves of special type. In [S] we studied equations describing Kummer surfaces in the case of an irreducible principal polarization on the abelian surface. The aim of this note is to give a treatment of the second case. We describe intermediate Kummer surfaces coming from abelian surfaces carrying a product principal polarization. In Proposition 12 we give explicit equations of these surfaces in ℙ⁵.
    Źródło:
    Annales Polonici Mathematici; 1996, 63, 1; 51-62
    0066-2216
    Pojawia się w:
    Annales Polonici Mathematici
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new division formula for complete intersections
    Autorzy:
    Passare, Mikael
    Powiązania:
    https://bibliotekanauki.pl/articles/1312650.pdf
    Data publikacji:
    1991
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    complete intersections
    residue currents
    integral representations
    Opis:
    We provide a new division formula for holomorphic mappings. It is given in terms of residue currents and has the advantage of being more explicit and simpler to prove than the previously known formulas.
    Źródło:
    Annales Polonici Mathematici; 1991, 55, 1; 283-286
    0066-2216
    Pojawia się w:
    Annales Polonici Mathematici
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of road safety in the context of horizontal visibility within intersections – field studies
    Autorzy:
    Brycht, Natalia
    Powiązania:
    https://bibliotekanauki.pl/articles/88708.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    road intersections
    road safety
    road signage
    visibility within intersections
    bezpieczeństwo ruchu drogowego
    oznakowanie drogowe
    skrzyżowanie dróg
    widoczność na skrzyżowaniu
    Opis:
    One of the important factors on which road safety depends is adequate visibility. This article analyses horizontal visibility within road intersections. The visibility condition depends on many factors, primarily on the geometric parameters of road elements and the location of buildings, fences, vegetation etc., neighboring the road. The aim of the research presented in the study was to determine the current condition of horizontal visibility, on the example of twenty two intersections located mostly in built-up rural area along a provincial road near Czestochowa. The research was carried out by two methods (the analysis of satellite photographs and the visual method) and the obtained results were compared. The assessment of the security level was based on applicable regulations and technical guidelines. It was found that the results of the visibility assessment based only on the analysis of maps and satellite photographs are in many cases overestimated, due to the fact that many small elements not visible in the photographs are not taken into account and the occurrence of convex vertical road arches within the field of visibility. However, the main reason for the insufficient visibility at the many intersections is the fact that the geometrical parameters of roads and their surroundings were shaped in the past when the traffic conditions were completely different. It was also noted that road managers perceive this problem and take measures to increase safety within road intersections.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2020, 2, 1; 150-157
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ball intersection model for Fejér zones of convex closed sets
    Autorzy:
    Schott, Dieter
    Powiązania:
    https://bibliotekanauki.pl/articles/729355.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    set-valued mappings
    Fejér monotone mappings
    relaxations
    central stretching
    convex sets
    ball intersections
    Opis:
    Strongly Fejér monotone mappings are widely used to solve convex problems by corresponding iterative methods. Here the maximal of such mappings with respect to set inclusion of the images are investigated. These mappings supply restriction zones for the successors of Fejér monotone iterative methods. The basic tool is the representation of the images by intersection of certain balls.
    Źródło:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2001, 21, 1; 51-79
    1509-9407
    Pojawia się w:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variations on a sufficient condition for Hamiltonian graphs
    Autorzy:
    Ainouche, Ahmed
    Lapiquonne, Serge
    Powiązania:
    https://bibliotekanauki.pl/articles/743758.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    cycles
    partially square graph
    degree sum
    independent sets
    neighborhood unions and intersections
    dual closure
    Opis:
    Given a 2-connected graph G on n vertices, let G* be its partially square graph, obtained by adding edges uv whenever the vertices u,v have a common neighbor x satisfying the condition $N_G(x) ⊆ N_G[u] ∪ N_G[v]$, where $N_G[x] = N_G(x) ∪ {x}$. In particular, this condition is satisfied if x does not center a claw (an induced $K_{1,3}$). Clearly G ⊆ G* ⊆ G², where G² is the square of G. For any independent triple X = {x,y,z} we define
    σ̅(X) = d(x) + d(y) + d(z) - |N(x) ∩ N(y) ∩ N(z)|.
    Flandrin et al. proved that a 2-connected graph G is hamiltonian if [σ̅]₃(X) ≥ n holds for any independent triple X in G. Replacing X in G by X in the larger graph G*, Wu et al. improved recently this result. In this paper we characterize the nonhamiltonian 2-connected graphs G satisfying the condition [σ̅]₃(X) ≥ n-1 where X is independent in G*. Using the concept of dual closure we (i) give a short proof of the above results and (ii) we show that each graph G satisfying this condition is hamiltonian if and only if its dual closure does not belong to two well defined exceptional classes of graphs. This implies that it takes a polynomial time to check the nonhamiltonicity or the hamiltonicity of such G.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2007, 27, 2; 229-240
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Turbo roundabouts signing and marking - current situation in Poland
    Autorzy:
    Macioszek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/393653.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    circular intersections
    turbo roundabout
    traffic engineering
    skrzyżowania z ruchem okrężnym
    rondo turbinowe
    inżynieria ruchu drogowego
    Opis:
    Turbo roundabouts operating in Poland from not long time. Turbo roundabouts are one of kind of multilane roundabouts. Proper signing and marking multilane roundabouts is lacking in Poland. This signing and marking should completely emphasizing circular character of this kind of intersections and also would facilitate in the conviction that selected lane is proper and that this selected vehicle trajectory is also appropriate. The current state of marking and signing of turbo roundabouts operating abroad and in Poland have been presented in this article.
    Źródło:
    Archives of Transport System Telematics; 2013, 6, 1; 27-31
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimating saturation flow under weak discipline traffic conditions, case study: Iran
    Autorzy:
    Dehghani-Zadeh, M.
    Tafti, M. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/224187.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    saturation flow rate
    signalized intersections
    heterogeneous traffic
    weak discipline traffic
    natężenie przepływu
    skrzyżowanie sygnalizowane
    ruch heterogeniczny
    Opis:
    Intersections, as the critical elements and the major bottleneck points of urban street networks, may have inconsistent performances in different countries. This is largely due to the fact that the factors affecting their performance e.g. driving behavior, vehicle characteristics, control methods, and environmental conditions may vary from one country to another. It is, therefore required to take into account these factors when developing or applying available models and methodologies for their capacity analysis or signal control setting. This is particularly important for the countries with heterogeneous and weak discipline traffic streams such as Iran. Meanwhile, estimating the saturation flow rate, which is a key parameter in capacity and delay analysis and in optimal timing of traffic signals, is of great importance. In this study, the possibility of identifying and or developing appropriate models for estimating the saturation flow rate at the signalized intersections in these situations has been explored. For this purpose, a case study performed at the signalized intersections located in the city of Yazd, a medium sized city located in the middle of Iran. Using the data obtained from several intersections together with the application of analytical procedures proposed by American, Australian, Canadian, Indonesian, Iranian and Malaysian highway capacity guides, the saturation flow rate was estimated from both field observations and analytical methods. A comparison of these results indicated that in the protected left-turn situations, the Australian guide produced the best comparable results with the field data. On the other hand, in the permitted left-turn situations, the method proposed in the American Highway Capacity Manual guide produced the best comparable results with the field data. Furthermore, three new models were developed for estimating the saturation flow rate in three different situations namely, unopposed mixed straight and turning traffic movements, opposed mixed straight and turning traffic movements and merely straight through movement. The effective width, traffic composition, and opposite oncoming through traffic flow were considered as the effective parameters in the proposed models. Moreover, using the multivariate regression analysis, the Passenger Car Equivalent coefficients for motorcycles and heavy vehicles were calculated as 0.51 and 2.09, respectively.
    Źródło:
    Archives of Transport; 2018, 46, 2; 47-60
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology for research on traffic safety at signalized intersections with countdown timers
    Autorzy:
    Sobota, A.
    Karoń, G.
    Żochowska, R
    Kłos, M. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/197460.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    countdown timers
    traffic safety
    signalized intersections
    multilane intersection
    licznik czasu
    bezpieczeństwo drogowe
    sygnalizacja świetlna
    skrzyżowanie wielopłaszczyznowe
    Opis:
    The article is a presentation of the authors‘ research work on determining the impact of countdown timers on traffic conditions, and - in this case - on the level of traffic safety at intersections. Therefore, the scientific aim of the article is to present the methodology used by the authors to carry out research in order to determine the influence of the function of the intersection with countdown timers within an urban transportation network on the level of safety at the intersection. To achieve the scientific objectives, measurements of traffic at three intersections with different functions in a transportation network have been performed.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 100; 191-201
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Incorrect U-turning of vehicles at intersections with traffic lights
    Autorzy:
    Krukowicz, Tomasz
    Firląg, Krzysztof
    Sterniczuk, Ewelina
    Powiązania:
    https://bibliotekanauki.pl/articles/1833606.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    road safety
    U-turning of vehicles
    turning back
    traffic signals
    intersections
    bezpieczeństwo na drodze
    zawracanie pojazdów
    sygnalizacja świetlna
    skrzyżowania
    Opis:
    The article describes the problem of incorrect U-turns at intersections with traffic lights. Statistical data on road incidents related to U-turns are presented. Then, the international, Polish and foreign regulations concerning u-turning at intersections with traffic lights were analysed. The situations in which U-turns are allowed or prohibited are presented. The differences in design rules for junctions with U-turns in different countries have been taken into account. A literature review was also carried out that outlined various current U-turns around the world, including the design of turning places, the location of turning points, road safety when turning, and the impact of U-turns on traffic conditions. The further part of the article presents the results of field tests of the U-turn at 6 intersections located in Warsaw. The research was conducted by video observation. The results were broken down by age, gender, place of registration of the vehicle, type of vehicle, and the effect of incorrect turning. Data on road incidents at the examined intersections were also analysed. Data from the database kept by the Police were compared with the measurement data. A regression analysis was performed between the types of recorded incorrect manoeuvres and the number of accidents at the intersection. The results of statistical analysis carried out do not indicate the existence of a relationship between the number of identified incorrect U-turns and the number of road incidents at intersections. Based on the research, it was found that the phenomenon of incorrect U-turns at intersections with traffic lights is common, and the use of directional (protected) signals does not eliminate this phenomenon. The conclusions indicate practical solutions to reduce the number of illegally U-turning vehicles. The recommended actions are related to the stage of shaping the road network, designing the road geometry and organizing traffic and traffic lights, and auditing road safety, as well as the stage of road operation.
    Źródło:
    Archives of Transport; 2021, 57, 1; 131-145
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Driver performance through the yellow phase using video cameras at urban signalized intersections
    Autorzy:
    Al-Mistarehi, Bara’ W.
    Alomari, Ahmad H.
    Obaidat, Mohammed T.
    Al-Jammal, Areen A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203849.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    driver behavior
    signalized intersections
    red light running
    yellow phase
    zachowanie kierowcy
    skrzyżowanie z sygnalizacją
    przejazd na czerwonym świetle
    żółta faza
    Opis:
    The main objective of this research is to examine the influencing parameters of driver performance through the yellow phase at urban signalized intersections with and without red-light running (RLR) cameras. Data were collected to include the intersection type, vehicle type, turning movement type, whether the vehicle position is in a platoon or not, presence of RLR cameras, green light flash devices, pedestrians, and pavement markings. A total of 2168 driver observations were extracted. Only 33.3% of the drivers stopped before the stop line, 59% of the drivers passed the intersection through the yellow phase, and 7% of the drivers committed RLR violations. The results showed that drivers were more likely to stop before the stop line through the yellow phase at locations with RLR cameras, green light flash devices, pavement markings, where pedestrians were present, and at a four-leg intersection. Chi-square tests indicated that all parameters had a significant impact on driver performance, except for the type of turning movement.
    Źródło:
    Transport Problems; 2021, 16, 1; 51--64
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measuring the relative importance of applying engineering solutions to urban traffic intersections: a planning perspective
    Autorzy:
    Alrawi, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/197693.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    transportation planning
    intersections
    traffic light
    roundabout
    underpass
    overpass
    linear regression
    planowanie transportu
    skrzyżowania
    sygnalizacja świetlna
    rondo
    przejście podziemne
    wiadukt
    regresja liniowa
    Opis:
    Summary. This research is an attempt to compare engineering solutions for traffic intersections from a planning viewpoint. In this research, various solutions have been discussed for traffic intersections (traffic light, roundabout, underpass and overpass). The research highlighted the importance of each of these solutions in urban environments and clarified all variables related to the pros, cons, costs, capacity and environmental compatibility of each of these solutions with the surrounding urban environment. Weights were developed for all these variables, then correlation was determined using the linear regression method. The analysis of statistical results shows that the creation of underpasses often achieves most of the designated goals when compared to other solutions, despite some technical difficulties and high construction costs.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 100; 5-13
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Working principle and performance evolution of camera-based intelligent signalized intersections: Samsun city, Türkiye example
    Autorzy:
    Aydin, Metin Mutlu
    Potoglou, Dimitris
    Cipcigan, Liana
    Powiązania:
    https://bibliotekanauki.pl/articles/27312355.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    intelligent intersections
    traffic chaos
    control delay
    dynamic signal timing
    urban road
    inteligentne skrzyżowania
    chaos drogowy
    opóźnienie sterowania
    dynamiczny pomiar czasu sygnału
    droga miejska
    Opis:
    In the current literature, it is clearly seen that most of the traffic chaos is generally observed at intersections of the urban roads in cities. On the other hand, many current traffic studies and research prove that fixed-time signalized intersections cannot have a good ability to control and manage current traffic flow at signalized intersection legs. For this aim, intelligent intersections were developed and started to be used in many cities all over the world in the last decade. These new intelligent intersection systems suggest dynamic signal times for all intersection legs by using real-time measured traffic data. These systems generally use cameras or loop detectors, which are located in the proper places on a signalized intersection leg and record vehicle movements. Within the scope of this study, a performance comparison was made for before and after the camera-based intelligent intersection applications at three isolated pilot signalized intersections within the scope of the "Smart City Traffic Safety" project, which is one of the largest Intelligent Transportation System projects in Turkey. After the system was activated, it was observed that the drivers had impatient behaviors in the beginning and had difficulty getting used to these new systems. After the signal cycle was regulated with the learning of artificial intelligence, it was seen that the drivers had more patience and more observant behaviors. It was also obtained from the analysis results that these new intelligent systems resulted in an average 16% decrease in control delays and a 20% decrease in vehicle speeds.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 121; 5--17
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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