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Wyświetlanie 1-15 z 36
Tytuł:
Research on hybrid modified pathfinder algorithm for optimal reactive power dispatch
Autorzy:
Suresh, V.
Senthil Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/2086822.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optimal reactive power dispatch
ORPD
real-power losses
pathfinder algorithm
PFA
modified pathfinder algorithm
mPFA
hybrid pathfinder algorithm
HPFA
optymalna dyspozycja mocy biernej
strata mocy rzeczywistej
algorytm wyszukiwania najkrótszej drogi
algorytm wyszukiwania najkrótszej drogi zmodyfikowany
algorytm wyszukiwania najkrótszej drogi hybrydowy
Opis:
Hybridization of meta-heuristic algorithms plays a major role in the optimization problem. In this paper, a new hybrid meta-heuristic algorithm called hybrid pathfinder algorithm (HPFA) is proposed to solve the optimal reactive power dispatch (ORPD) problem. The superiority of the Differential Evolution (DE) algorithm is the fast convergence speed, a mutation operator in the DE algorithm incorporates into the pathfinder algorithm (PFA). The main objective of this research is to minimize the real power losses and subject to equality and inequality constraints. The HPFA is used to find optimal control variables such as generator voltage magnitude, transformer tap settings and capacitor banks. The proposed HPFA is implemented through several simulation cases on the IEEE 118-bus system and IEEE 300-bus power system. Results show the superiority of the proposed algorithm with good quality of optimal solutions over existing optimization techniques, and hence confirm its potential to solve the ORPD problem.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137733, 1--8
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grzegorz Wiśniewski, POLSKIE DROGI W PETERSBURGU. ŚWIACKI, SŁONIMSKI, BRITANISZSKI, KOCZERGIN, Warszawa: Państwowy Instytut Wydawniczy, 2014, ss. 119.
Autorzy:
Orłowski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2033109.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Slavia Orientalis; 2015, 4; 841-843
0037-6744
Pojawia się w:
Slavia Orientalis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perspektywy i problemy wykorzystania Północnej Drogi Morskiej w żegludze międzynarodowej
Northern Sea Route – Opportunities and Problems in International Shipping
Autorzy:
Makowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/960002.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Północna Droga Morska jest najkrótszym szlakiem żeglugowym łączącym europejską część Rosji z Dalekim Wschodem i Syberią. Poszukiwanie przejścia północnego jako drogi do Chin i Indii trwało od połowy XVI do końca XIX w., a w poszukiwaniach uczestniczyli głównie Anglicy, Holendrzy i Rosjanie. Szlak jest niezwykle ważny, bo tylko w 2007 r. statki żeglujące po Morzu Arktycznym przewiozły około 10 mln ton różnych towarów. Północna Droga Morska to troska Rosji, a „północny korytarz” wszedł do „Strategii transportowej Rosji do 2030 r.”. Opracowano również „Koncepcję rozwoju PDM do 2015 r.” i projekt ustawy o Północnej Drodze Morskiej. Istotnym czynnikiem wpływającym na wykorzystanie Północnej Drogi Morskiej będą wzajemne relacje między członkami Rady Arktycznej (Stany Zjednoczone Ameryki Północnej, Kanada, Rosja, Norwegia, Finlandia, Szwecja i Dania), państwami posiadającymi status obserwatora w Radzie (Niemcy, Francja, Holandia, Wielka Brytania, Hiszpania i Polska) oraz państwami starającymi się o status obserwatora (Chiny, Japonia, Korea Południowa).
The Northern Sea Route is the shortest shipping lane connecting European part of Russia with the Far East and Syberia. The search for a route to China and India, undertaken by the English, Dutch and Russians, went on from mid 16th century until the end of 19th century. Its importance in the present day is exemplified by the traffic: 2007 alone saw 10 million tons of goods shipped along the Route. The Northern Sea Route is the apple of Russia’s eye. It plays a major part in the Transport Strategy of the Russian Federation until 2030, Russia also produced Concept of the Northern Sea Route Development until 2015 and a draft new law specifically addressing shipping along it. A crucial factor in economic feasibility of the route is the state of relations between members of the Arctic Council (the United States, Canada, Russia, Norway, Finland, Sweden, Iceland and Denmark), the observer states (Germany, France, the Netherlands, the United Kingdom, Spain and Poland) and the states that requested observer status (China, Japan, South Korea).
Źródło:
Prawo Morskie; 2012, XXVIII; 249-264
0860-7338
Pojawia się w:
Prawo Morskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osiedla wczesnomodernistyczne, reinterpretacja tradycji oraz architektura i urbanistyka trzeciej drogi jako różne odpowiedzi na problemy miast na początku XX w
Autorzy:
Trammer, Hubert
Powiązania:
https://bibliotekanauki.pl/articles/2022386.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2017, 180; 104-122
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drogi pocieszenia w "Tristiach" Osipa Mandelsztama
The Notion of Consolation in Osip Mandelstam's 'Tristia'
Autorzy:
Stawarz, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/2031496.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
consolation
Osip Mandelstam
Tristia
elegy
an associative image
Źródło:
Slavia Orientalis; 2020, LXIX, 1; 47-60
0037-6744
Pojawia się w:
Slavia Orientalis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of models to study traffic accidents on the final sections of access roads to the cities: a case study of three major Iranian cities
Autorzy:
Fallah Tafti, Mehdi
Roshani, Reza
Powiązania:
https://bibliotekanauki.pl/articles/1955155.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
traffic accidents
city access roads
entrance roads
traffic safety
accident prediction model
neural networks
wypadki drogowe
drogi dojazdowe do miasta
drogi wjazdowe
bezpieczeństwo na drodze
modele przewidywania wypadków
sieci neuronowe
Opis:
The final sections of main access roads to the cities require especial attention as the frequency of accidents in these road sections are considerably higher than other parts of interurban roads. These road sections operate as an interface between the rural roads and urban streets. The previous researches available on this subject are limited and they have also mainly focused on a narrow range of factors contributing to the accidents in these areas. The main contribution of this research is to consider a relatively comprehensive range of potential factors , and to examine their impacts through the development and comparison of both conventional probabilistic models and Artificial Neural Network (ANN) models. For this purpose, information related to the main access roads of three major Iranian cities were collected. This information consisted of accident frequency data together with the field observations of traffic characteristics, roadway conditions and roadside features of these roads. Various ANN and probabilistic models were developed. The frequency of accidents, i.e. fatal, injured, or damaged accidents, was considered as the output of the developed models. The results indicated that a hybrid of ANN models, each comprised of 10 input variables representing traffic, roadway and roadside conditions, outperformed several probabilistic models, i.e. Poisson, Negative binomial, Zero-truncated Poisson, and Zero-truncated Negative Binomial models, also developed under similar conditions in this study. Moreover, effective roadway width, roadway lighting condition, the standard deviation of vehicles speed, percentage of drivers violating the speed limit, average annual daily traffic, percentage of heavy goods vehicles, the density of roadside commercial and industrial land uses, the density of median U-turns, the density of local access roads, and the effective width of the left-side shoulder were identified as the most effective factors contributing to the accidents in these areas. The developed ANN model can be used as a tool to predict accident rates in these road sections, and to estimate a potential reduction in the accident rates, following any improvements in the major factors contributing to the traffic accidents in these areas.
Źródło:
Archives of Transport; 2021, 59, 3; 129-148
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of limestone in historic road surfaces – a case study
Autorzy:
Hydzik-Wiśniewska, Joanna
Hycnar, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2203334.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kostka brukowa
nawierzchnia drogi
wapień
paving stones
historic road surface
limestone
Opis:
The article presents the problem of selecting the correct type of limestone for producing paving stones used to renovate the surface of Mariacki Square in Krakow. Due to using up local limestone deposits, imported limestones began to be used. The first one was a Turkish limestone with the trade name Lotus Beige. Despite substantial physical and mechanical parameters (compressive strength 134 MPa, water absorption 0.26%), after several years of use, the paving stone cracked and, as a result, fell apart into smaller fragments. Hauteville limestone from France has been selected for the following reconstruction of the surface. This limestone in the air-dry state was characterised by even higher parameters, i.e. compressive strength of 157 MPa, flexural strength at 16.9 MPa, Bohme Abrasion test at 15275 mm3, and water absorption at 0.23%. The tests also showed absolute frost resistance and high resistance to thermal shock. Unfortunately, after several years of using the surface of Mariacki Square, cracks and flaking of the rock material have been observed in terms of some paving stones. These cracks appeared within the so-called stylolite seams, which are a natural feature of limestone. Despite a very strict selection of materials, unfortunately, problems with the surface’s durability could not be avoided.
Źródło:
Archives of Mining Sciences; 2022, 67, 3; 477--490
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter optimization of sea waterway system dredged to the specified depth case of the modernized Świnoujście-Szczecin fairway
Autorzy:
Gucma, S.
Powiązania:
https://bibliotekanauki.pl/articles/224014.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sea waterways
optimization
parameters
drogi wodne
optymalizacja
parametry
Opis:
The paper presents a methodology for designing and optimizing the parameters of reconstructed marine waterways dredged to a certain depth. The reconstruction comes down to a particular deepening and widening of the waterway to permit operation of longer, broader and deeper drawing ships. The methodology, based on a systemic approach to the design and optimization of waterways, uses the method developed at the Marine Traffic Engineering Centre (MTEC), Maritime University of Szczecin and methods of computer simulation. The optimization criterion used is the minimization of the aggregated costs of construction and operation of the waterway and its navigation systems.
Źródło:
Archives of Transport; 2016, 40, 4; 29-38
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Modified Approach for Estimation of Passenger Car Units on Intercity Divided Multilane Highways
Autorzy:
Srikanth, S.
Mehar, A.
Powiązania:
https://bibliotekanauki.pl/articles/224108.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PCU
traffic volume
multilane highway
speed
VISSIM
natężenie ruchu
drogi wielopasmowe
prędkość
Opis:
The accuracy of measured traffic flow on a roadway is highly depends on correctness of PCUs used for converting traffic volume. Field data for the present study was collected from the mid-block road sections of different divided multilane highways in India. Video graphic method was used for collecting the field data. PCUs are estimated from the available methods as given in the literature by using traffic flow data observed in the field. Present study describes a modified methodology for estimation of PCU value of subject vehicles that includes the time headway as influencing parameter. The approach used in the present study is inspired from the method of dynamic PCU estimation where a PCU is expressed as the ratio of speed ratio and area ratio of standard cars to the subject vehicle type. Unlike dynamic PCU method, this method includes time headway factor for PCU estimation. The method found more realistic and logical as it provides relatively higher values of PCUs than those obtained from dynamic PCU method. Simulation of traffic flow was also performed through microscopic simulation model VISSIM for generating congestion and for comparing estimated PCU values at the level of maximum traffic volume. The methodology adopted in this study will be extended for development of comprehensive PCU model by including more numbers of influencing factors under varying traffic and roadway conditions.
Źródło:
Archives of Transport; 2017, 42, 2; 65-74
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Pedestrian-Vehicle Interaction on Urban Roads: a Critical Review
Autorzy:
Thakur, Sourabh
Biswas, Subhadip
Powiązania:
https://bibliotekanauki.pl/articles/223619.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
urban road
pedestrian safety
pedestrian crossing
pedestrian delay
drogi miejskie
bezpieczeństwo pieszych
przejście dla pieszych
Opis:
Walking is being promoted as either a main mode of transportation or as a part of multimodal mobility. However, a rapid growth and development in urban areas has resulted in a drastic increase in human population as well as vehicular population in most of the metropolitans across the globe. Due to this, there is an unavoidable increase in conflicts between vehicular traffic and pedestrians often sharing the same road space. At an undesignated crossing, pedestrians wait for suitable inter-vehicular gap to cross the road. However, in order to reduce the waiting delay, pedestrians often take risk by accepting smaller gaps while crossing the road. It increases the probability of their collision with approaching vehicles. Apart from the frequency of crashes, the crash severity is also vastly governed by traffic flow characteristics. In this regard, it is a common belief that the reduction in speed of approaching vehicles can significantly bring down the severity of pedestrian crashes. On the other hand, vehicular movements also get obstructed due to the pedestrian activities carried out on the carriageway. During pedestrian crossing maneuvers, pedestrians often force the approaching vehicle(s) either to slow down or to change the lane which leads to reduction in the average speed of traffic stream. However, in case of pedestrians walking along the road, vehicles tend to shy away towards the center of carriageway to ensure the safe movements of pedestrians. Hence, pedestrians irrespective of crossing or walking along the road, eventually results in the reduction in speed as well as capacity of the road and sometimes prove to be a promising threat to safety of the road users. Therefore, in order to delve into the phenomena of pedestrian-vehicle interaction, one should need to study the mutual influences of pedestrian and vehicular movements on each other. In this background, this paper puts forward a detailed literature review on the assessment of pedestrian-vehicle interaction on urban roads. Findings of the paper are specific and infer the behaviors of both pedestrians and vehicles while sharing the same road space.
Źródło:
Archives of Transport; 2019, 51, 3; 49-63
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of skid resistance of asphalt mixtures in laboratory conditions
Autorzy:
Gardziejczyk, W.
Wasilewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/230616.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kruszywo
nawierzchnia drogi
BPN
odporność na poślizg
PSV
mieszanka asfaltowa
aggregate
road surface
skid resistance
asphalt mixture
Opis:
The aggregate applied for the wearing course has a significant influence on skid resistance of road surfaces. However, it is difficult to evaluate the behaviour of road surface in use on the basis of the Polished Stone Value (PSV) determined for the aggregate according to the so called ‘British method’. The British method, which is currently used in many countries, does not allow to determine the influence of neither the grain size of the aggregate nor the type of the wearing course on skid resistance of road surface. The present paper suggests a method for evaluation of the British Pendulum Number (BPN) for road surfaces in laboratory conditions. The authors assumed the BPN for polished slabs, made from asphalt mixtures, as the criterion. The index was measured with the British Pendulum Tester. The simulation of the process was conducted on research stand (called slab polisher) built at Bialystok University of Technology (BUT). The results of laboratory tests indicate that surfaces from asphalt concrete (AC) have slightly higher values of BPN in comparison with the values determined for surfaces made from stone mastic asphalt (SMA).
Źródło:
Archives of Civil Engineering; 2012, 58, 4; 521-534
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct observation of rerouting phenomena in traffic networks
Autorzy:
Kucharski, R.
Gentile, G.
Powiązania:
https://bibliotekanauki.pl/articles/223498.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dynamic traffic assignment
rerouting phenomena
route choice models
information comply model
dynamiczna alokacja ruchu
przekierowania
modele wyboru drogi
wybór trasy
Opis:
In this paper we propose how available dataset can be used to estimate rerouting phenomena in traffic networks. We show how to look at set of paths observed during unexpected events to understand the rerouting phenomena. We use the information comply model [1] and propose its estimation method. We propose the likelihood formula and show how the theoretical and observed rerouting probabilities can be obtained. We conclude with illustrative example showing how a single observed path can be processes and what information it provides. Contrary to parallel paper [2] where rerouting phenomena is estimated using real traffic flow measures from Warsaw, here we use only synthetic data. The paper is organized as follows. First we elaborate on rerouting phenomena and define the traffic network, then we summarize the literature behind rerouting phenomena. We follow with a synthetic definition of dynamic traffic assignment needed to introduce ICM model in subsequent section. Based on that introduction we define the observations and propose estimation method based on them followed by illustrative example. Paper is summarized with conclusions and pointing of future directions.
Źródło:
Archives of Transport; 2014, 30, 2; 57-66
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design optimal rural road network using GIS
Autorzy:
Modinpuroju, A.
Prasad, C.
Powiązania:
https://bibliotekanauki.pl/articles/223559.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rural roads
optimal road network
minimum travel time
facility index
GIS
drogi wiejskie
optymalna sieć dróg
minimalny czas podróży
indeks obiektu
Opis:
To have an effective development among the isolated, remote areas, rural transportation is recognized as a key factor. Efficient rural transportation depends largely on a well-knit road network to provide accessibility and mobility in rural areas. This work affords an applied method for the development of rural road networks in rural areas of developing countries. The proposed methodology enables to determine nodal points in the rural road network based on the facility index of the settlements. The rural road network is generated by connecting the nodal points by minimum travel time path in Geographical Information System (GIS). Spatial analysis is carried out in the study area to identify the Desirable Coverage Distance of the Facility(DCDF). The Village Facility Index (VFI) is calculated by considering the desirable coverage distance. The suggested methodology is simple and practical, hence, highly applicable to real-world scenarios, as demonstrated in the definition of the road network for the rural areas.
Źródło:
Archives of Transport; 2017, 41, 1; 63-71
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 36

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