Communications - Scientific Letters of the University of Zilina, 1999 (vol. 1), issue 4
Articles
Traffic Quality and its Management in Urban Areas
Csaba Koren
Communications - Scientific Letters of the University of Zilina 1999, 1(4):4-11 | DOI: 10.26552/com.C.1999.4.4-11 
The purpose of the paper is to overview the status of traffic quality in various countries, based on a specific questionnaire and some literature survey by trying to give answers to the following questions: What is traffic quality? What is the level of traffic quality? Where is the quality gap? How is traffic quality managed? To collect information on these issues a questionnaire was established and members of the PIARC Committee on Urban Areas or technical experts indicated by them were approached. Also general information was collected regarding the cities involved. There were 32 cities from 16 countries that replied to the questionnaire.
Harmonisation Method of Safety Validation Systems
Géza Tarnai
Communications - Scientific Letters of the University of Zilina 1999, 1(4):12-16 | DOI: 10.26552/com.C.1999.4.12-16
This paper presents methods to harmonize different safety validations, which were created at different times and by different prescriptions, with each other and with the CENELEC standards, in connection with a concrete application example, the realization of the first electronic interlocking system of the MÁV.
Maintaining Inter-Vehicle Spacing -Using Synergetic Effects between Rail and Road Traffic!
Günter Hertel, Hans-Eberhard Siebert, Richard Vogel
Communications - Scientific Letters of the University of Zilina 1999, 1(4):17-28 | DOI: 10.26552/com.C.1999.4.17-28
Now as ever, transportation services are a decisive criterion of an economy. This constitutes the background for dealing with the various routing and protection principles for the two important land-based traffic systems: namely, road and rail transport. The objective is to determine how the two systems could benefit from the respectively chosen approaches to a solution and which future operating concepts this makes possible. Whether in rail or road traffic, inter-vehicle spacing directly effects several quality criteria of the transport process, and vehicle throughput. The various theoretically possible and practically applied principles for maintaining...
In Spite of 110 Years of Lill 'S Law -110 Years Basic Mistakes in Transport Science
Hermann Knoflacher
Communications - Scientific Letters of the University of Zilina 1999, 1(4):29-36 | DOI: 10.26552/com.C.1999.4.29-36
Lills law, published 1889 includes implicitly the so-called "time constancy" for mobility which was found in many empirical studies during the last decades, worldwide. It can be shown that Lills law can be derived from a more basic human behaviour law, discovered by Weber and Fechner in the 19th century. The knowledge of this law helps us to a better understanding of the mechanisms of modern transport systems and to find solutions which are more cause-related.
A Mathematical Modelling of Nitrogen Oxide Formation in a cng Spark Ignition Engine
Vladimir Hlavna, Daniela Zvarkova
Communications - Scientific Letters of the University of Zilina 1999, 1(4):37-48 | DOI: 10.26552/com.C.1999.4.37-48
Nitrogen oxides occupy aspecific position among gaseous harmful emissions produced by combustion engines. This position may externally appear as a coherence between energetic and ecological properties of the engine. The paper deals with a 3-D modelling of nitrogen oxides formation in a CNG ignition engine when the FLUENT programme is applied.
Inspection No.1 and No.2 of Postal Obligations Concerning Mail Parcels under Eu-Regulated Universal Services
Ida Ercsey
Communications - Scientific Letters of the University of Zilina 1999, 1(4):49-54 | DOI: 10.26552/com.C.1999.4.49-54
The examination of the possibility of the nation-wide delivery of postal packets no larger than 10 kg. The comparison of the present and expected packet service level. The presentation of the new packet forwarding service and the conditions for its introduction. The putting into figures of the extra turnover at the distribution points and of the transportation tasks in the new packet delivery system. Cost calculation for the service according to the EU regulations.
An Am Stereo System with Additional Data Transmission
Istvan Standeisky
Communications - Scientific Letters of the University of Zilina 1999, 1(4):55-58 | DOI: 10.26552/com.C.1999.4.55-58
Previously proposed systems for AM stereo are discussed. The new compatible AM stereo system is described. The new system makes it possible to implement a stereo transmission with a bandwidth in the sound channels from 50 Hz to 4.5 (or more) kHz and a data transmission with a modulation rate of 25 bit/sec.
The New Numerical Methods for Mathematical Modelling of Pollutant Transport
Karel Kovářík
Communications - Scientific Letters of the University of Zilina 1999, 1(4):59-68 | DOI: 10.26552/com.C.1999.4.59-68
This paper deals with a solution of the transport governing equation in the saturated zone by the random-walk and DR method connected with the boundary element method. The boundary element's solution produces a continuous velocity field which is used to solve the transport equation by both methods. These models can be effectively used to simulate groundwater contamination problems.
Some Optimization Aspects Of Underground Grouting Walls b Resins
Jaroslav Broul
Communications - Scientific Letters of the University of Zilina 1999, 1(4):69-73 | DOI: 10.26552/com.C.1999.4.69-73
Matter of this contribution is presentation of some optimization aspects by constructing of UGW's, on the base of injection by resins. The author presents some experience of UGW construction in experimental stage on waste dump RSTO Duslo, a.s. Šaľa (SR). Simultaneously, is also important to develop methods quality checking during UGW construction and during next monitoring, when UGW will be fully in action. In this contribution some methods could be found.
Classical and Recent Methods of Enterprise Diagnostics
Ondrej Buček, Milada Bučková
Communications - Scientific Letters of the University of Zilina 1999, 1(4):74-77 | DOI: 10.26552/com.C.1999.4.74-77
This article deals with both classical and more recent methods of diagnostics which may be used when making diagnostics of enterprise. Besides the basic terms there is defined also the relation of the diagnostics toward the analysis, controlling and finally to the information systems. The application of methods and techniques of diagnostics is analysed in relation to the evaluation of both external as well as internal factors.