Yes (126)
Number of found documents:
126
Published from
to
The role of user charges for infrastructure maintenance costs
Kudláčková, Nina
2010 - English
The increasing importance of maintenance has led to research questions on ways of charging
infrastructure users and mobilisation of funds for maintenance activities. Technological developments
help to bring advanced and differentiated schemes of infrastructure charging closer. For long distance transport, charging road use in one country may well lead to changes in competitive positions of countries. The system of road user charges introduced in one country might change the competitive positron of the neighbouring country. The other dimension of competition is between various transport modes. Depending on the various origin-destination submarkets, there may be substantial competition between transport modes. This calls for an integrated approach to infrastructure Charles in order to ovoid equity
problems. This article focuses on these problems from the European point of view.
Keywords:
transport user; transport user charges; infrastructure maintenance costs
Available in digital repository of UPCE.
The role of user charges for infrastructure maintenance costs
The increasing importance of maintenance has led to research questions on ways of charging infrastructure users and mobilisation of funds for maintenance activities. Technological developments help ...
Line part of ETCS L2 application in the Czech Republic – current status
Kunhart, Milan
2010 - English
The article is concerned with the Pilot Project for homologation of ERTMS/ETCS system
in the Czech Republic (PP). The article describes an operational characteristic of the PP (ETCS application on the conventional lines, mixed traffic with equipped and unequipped trains) and a technical characteristic of the PP (level 2
application, cooperation with existing trackside system from domestic supplier, development
of the specific transmission module of the national Automatic Train Protection system of the LS type). The article describes the architecture of the ETCS L2 application and a development of the special interlocking - RBC interface IRI, its functionalities and behaviour. The article describes some of the test procedures used on the PP for the purposes of assessment and validation of the system components and procedures. The functional tests of the system components
were performed primarily. Then the integration tests between laboratory simulators and then between real equipments were carried out. Very complex tests had to be done in order to obtain a preliminary technical approval of the new interlocking software. Test strategy was crowned by performing the on-site tests of the real equipment on the PP line.
Keywords:
ERTMS; ETCS L2; Interlocking - RBC Interface; system architecture; test procedures for the purposes of assessment and validation
Available in digital repository of UPCE.
Line part of ETCS L2 application in the Czech Republic – current status
The article is concerned with the Pilot Project for homologation of ERTMS/ETCS system in the Czech Republic (PP). The article describes an operational characteristic of the PP (ETCS application on ...
Fare significance and effects on passenger public transport
Melichar, Vlastimil; Ježek, Jindřich; Pojkarová, Kateřina
2010 - English
A fare is probably the most intensive studied factor of transport demand. It is because of two
reasons: fare and its changes are relatively easy identifiable and measured and it is also the most easy and most often modified factor. A fare is crucial factor for public transport service, because it is the main source of income for operators. Generally, while a fare increases, demand decreases. If the sales following
fare increase will grow or come down, is depend on functional relation between fare and demand,
i.e. demand curve. Systems of fare could have various forms, for examples they could be areal, zonal or structured. Each one of them has its own attributes. It is usual to express the relation through elasticity concept. But fare elasticity isn’t just theoretical concept. It is also important tool for public transport planning and controlling. Elasticity is used for estimation of patronage and sales changes, which is based on fare changes.
Keywords:
fare; elasticity; demand; passenger public transport
Available in digital repository of UPCE.
Fare significance and effects on passenger public transport
A fare is probably the most intensive studied factor of transport demand. It is because of two reasons: fare and its changes are relatively easy identifiable and measured and it is also the most easy ...
Evaluation of pavement condition and repair planning
Petkov, Ivan
2010 - English
The text bellow describes the current state of the road maintenance and management. Also reviews
the methods for evaluation of the road pavement condition, collection of data and analysis.
During the transition in Central and Eastern European countries the rapid growth of car ownership and all the other transport means leads to the growing necessity for adequate evaluation of the actual condition of the road networks and it’s further development, methods of infrastructure planning and management.
Prior to the above there is a necessity to: improvement of the road management methods through
administrative (procedure) changes, introduction to modern planning techniques, institutional
reorganizations, improvement of the selection criteria for projects and executors. This also leads to the necessity of unification with European standards, rules and regulations for evaluation the road condition and planning the road repairs. In this aspect, necessity of setting up a system which will improve the strategic road repair planning and infrastructure in response to the expected road transport needs over medium and long term planning periods turns out to be of utmost importance.
Keywords:
load bearing capacity; maintenance; techniques
Available in digital repository of UPCE.
Evaluation of pavement condition and repair planning
The text bellow describes the current state of the road maintenance and management. Also reviews the methods for evaluation of the road pavement condition, collection of data and analysis. During ...
The ballast pick-up problem in high speed trains
Sanz-Andres, Angel; Navarro-Medina, Fermín
2010 - English
When a high speed train overpasses a critical speed produces a wind speed close to the track large enough to start the motion of the ballast elements, eventually leading to the rolling of the stones and, if they get enough energy, they can jump and then initiate a saltation-like chain reaction. In this contribution a mathematical model of the initiation of the motion is presented. The dynamics of the stone is formulated taking into account both gravity and aerodynamic forces. These aerodynamic forces are the result of the train-generated-gust impinging on the stones. Although they are intrinsically non steady, under some conditions a cuasi-steady aerodynamic model can be employed. Conditions for the start of the
motion are obtained in terms of the Tachikawa number (a kind of Froude number). The aerodynamic
characteristics are included in terms of the zero aerodynamic moment line of the stone, and the
aerodynamic moment coefficient.
Keywords:
high speed trains; ballast; saltation; modelization
Available in digital repository of UPCE.
The ballast pick-up problem in high speed trains
When a high speed train overpasses a critical speed produces a wind speed close to the track large enough to start the motion of the ballast elements, eventually leading to the rolling of the stones ...
Walking as a sustainable transport mode in cities
Schmeidler, Karel
2010 - English
Spatial mobility - a basic human need for movement influences the overall development of society. The present day offers many kinds of means of transport and ways how to move fast even at a long distance in the global world. Fascination by this previously unknown possibility - to travel all
over the world in a relatively short time - often diverts attention from the most natural and also
the healthiest modes of transport. Walking indeed is the first and basic transport mode, and when extreme cases such as the handicapped, injured and for other reasons walking - incapable people are left out, it is also the healthiest and most typical transport mode of human beings. Unfortunately, the benefit of walking is nowadays often disregarded and replaced with other means of transport - most frequently individual car traffic. Present - day cities have changed into car areas in which pedestrians are pushed out by danger, noise, and combustion gases produced by columns of stopping and starting vehicles. Parking cars obstruct pedestrians' view and movement. The liberty of walking in city centres can be regarded as an attribute of a free personality according to The Charter of Fundamental Rights and Freedoms.
Keywords:
walking; pedestrians; walkability; urban space; non-motorised modes of transport
Available in digital repository of UPCE.
Walking as a sustainable transport mode in cities
Spatial mobility - a basic human need for movement influences the overall development of society. The present day offers many kinds of means of transport and ways how to move fast even at a long ...
Improving passive safety by computer simulation
Štych, Jan
2010 - English
Increasing of safety is necessarily - as every other development - a trial and error process.
Traditional way to verify the results of development is construction and testing of many prototypes. This is time consuming and expensive. Proven alternative is a virtual simulation. Automotive industry was the first using it almost exclusively for crash tests. This remains the main role today, but the development of technology and increasing of computer power has enabled usage of simulation in new areas. Today is simulation used in the process of manufacturing (stamping, welding ...) and allows direct analysis of the influence of the manufacturing process in crash test result. Simulation gives an accurate description of inflating behavior of airbags. Simulation is also used in comfort, for example in the development of car seats is possible to evaluate effect of vibration transmitted to occupants. Simulation can be used to test the durability of road barriers, where you can virtually check the behavior
before physical test. Company ESI Group, a leading global supplier and innovator in this field, has a constantly evolving portfolio of software tools enabling realistic and predictive simulations.
The effectiveness of software tools is enhanced by a common environment to define the role and easy portability of the results from one area to another simulation, i.e. you can make very accurate simulation of crash tests, with the influence of manufacturing processes of individual components. MECAS ESI, Czech branch of ESI Group, provides distribution of computer simulation tools and support in Central and Eastern Europe.
Keywords:
simulation; crash; safety; FEM
Available in digital repository of UPCE.
Improving passive safety by computer simulation
Increasing of safety is necessarily - as every other development - a trial and error process. Traditional way to verify the results of development is construction and testing of many prototypes. This ...
Measuring and valuing travel time reliability – an example for hard shoulder operation
Vuren, Tom
2010 - English
Most transport infrastructure investments aim to reduce average travel times and their appraisal
depends to a large extent on travel time savings and their value. There is an increasing recognition that
in addition to average travel times, their reliability affects travelers’ choices and their valuation. However, the representation of travel time variability in network models, and hence our ability to forecast future impacts on reliability, has been limited. New data sources have enabled us to establish relationships between readily measurable characteristics and travel time variability. This now allows us to incorporate reliability in project appraisal, using standard economic cost-benefit techniques. The paper
illustrates the method with an example of hard shoulder operations on Motorways around Birmingham
in England.
Keywords:
economic appraisal; travel time variability; hard shoulder operation
Available in digital repository of UPCE.
Measuring and valuing travel time reliability – an example for hard shoulder operation
Most transport infrastructure investments aim to reduce average travel times and their appraisal depends to a large extent on travel time savings and their value. There is an increasing recognition ...
The application of fuzzy logic to a simulation of railway station
Záhorová, Věra
2010 - English
This article is a contribution to investigation concerning development of a simulation model
of a passenger railway-station. Concretely to a part of this research, which is related to a problem, how to simulate a choice of a platform line to a delayed train. Potentiality of different methods of a computational intelligence to this task handling was reviewed. Although another method – an evaluation of options – was used for construction of simulation model [3], an applicable result was obtained also using fuzzy controller. An idea of fuzzy inference and of fuzzy system structure is described in this paper
at some length. Following part is especially focused on a way how to create a fuzzy rules base. Last part of paper shows some results obtained in the process of creation of a Mamdani fuzzy logic controller and in the course of verification of its ability to choose a line to a delayed train correctly.
Keywords:
simulation; fuzzy controller; rules base; railway
Available in digital repository of UPCE.
The application of fuzzy logic to a simulation of railway station
This article is a contribution to investigation concerning development of a simulation model of a passenger railway-station. Concretely to a part of this research, which is related to a problem, how ...
Stability Control of Renewable Energy Sources in Distribution Systems
Tlustý, Josef; Müller, Zdeněk; Valouch, Viktor
2010 - English
Deregulation in the power market has encouraged the move towards distributed generation, where many smaller generating plants located close to major loads are penetrating into interconnected power systems. When the penetration level increases, several other problems will need to be faced and solved. Stability problems may arise, new planning tools will be needed, dispatching of energy sources with typical random production will be necessary, protection systems must be integrated and revised. In order to simulate power system dynamics programmable opened software in Matlab – DynaSolv was developed. The paper describes various principles of penetration synchronous machine type DGS into distribution network. This study provides possible complex analysis view on DGS stability issues, which can answer the possibility of connection.
Keywords:
stability; distributed generation; globally penetrated system; eigenvalues
Available in digital repository of ČVUT.
Stability Control of Renewable Energy Sources in Distribution Systems
Deregulation in the power market has encouraged the move towards distributed generation, where many smaller generating plants located close to major loads are penetrating into interconnected power ...
NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web
Send your suggestions and comments to nusl@techlib.cz
Provider
Other bases