Riva, Croatia
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Dodic A.,Port of Rijeka Authority | Dodic A.,RIVA Inc | Jare B.,University of Maribor | Babic R.,University of Maribor
Informacije MIDEM | Year: 2010

This paper describes the design and realization of the third and fourth order recursive digital filter (IlR digital filter) using PLC controller. The purpose of the filter is elimination of unwanted signals which occur during processing of analog signals in the industrial process automation with PLC controllers. The Siemens S7-315-2DP PLC controller is used in practical realization. In this application, we chose the eliptical filter with a cut-off frequency of 3 Hz and a sampling frequency of 50 Hz. With format long of the filter coefficients values we obtain the expected stop band attenuation of 40 dB as it is designed with MATLAB software. The values of impulse response are applied to compare PLC controller realization of digital filter and simulated structure with MATLAB. The results for the third and fourth order digital filter with format long filter coefficients and with shortened mode format of filter coefficients entry are summarised in tables. A magnitude frequency response of the 4th order digital filter for a cascaded form is displayed as figures, general and detailed for passband. Comparison of errors in impulse response for direct and cascade structure is demonstrated in this article. Finally, in comparison to the third order digital filter where the attenuation of 40 dB is obtained at 7 Hz, with the fourth order filter structure, the attenuation of 40 dB reaches at 4 Hz.


Hlaca B.,Port of Rijeka Authority | Rudic D.,Polytechnic of Rijeka | Hirnig S.,Polytechnic of Rijeka
Promet - Traffic - Traffico | Year: 2010

The economic situation and comparative advantages of the Port of Rijeka are no more than important preconditions of its development and competitive ability. No adequate connection of the Port of Rijeka to its catchment area is possible without a modern rail and road traffic. The researches and analyses of the port hinterland connection current state, the results of which are provided in these documents, clearly indicate the need to upgrade the existing railway tracks and build a new level Rijeka - Zagreb railway line. This line is a vital condition for ensuring both, a strong growth of the port performances and its competitive ability vis-a-vis other neighbouring ports. The level railway line Rijeka - Zagreb with Rijeka railway junction adequately upgraded, should be therefore regarded as strategic traffic project and conditio sine qua non for the future development of the Port of Rijeka. However, no solution of the Rijeka railway junction problem will be possible without finding the right way for better connection of some of the port terminals. When considering the integral solution of the rail traffic in the greater Rijeka Basin, it is important to know that the access to individual port terminals, the connection with the railway in Istria through the Učka Tunnel and connection with the port terminals on the Island of Krk are of great importance for the Port of Rijeka future development. The efforts to recognize the problems in the port environment and define priorities that make the rail transport a key factor of the Port of Rijeka's future growth, are the main contributions of this study.


Tijan E.,University of Rijeka | Agatic A.,Port of Rijeka Authority | Hlaca B.,Port of Rijeka Authority
Promet - Traffic - Traffico | Year: 2012

The paper researches the necessity and requirements for Port Community System (PCS) implementation in Croatian seaport clusters. The authors define the Port Community and analyze the basic features of seaport clusters and Port Community Members (PCM). The most important documents in seaport operations are identified and analyzed. The role of Port Authority as the most important factor of PCS implementation in the Croatian seaports is defined. The Seaport Information and Communication Technology (ICT) systems are defined and analyzed, and phases of ICT integration in Port Community are determined, along with the current status of the Croatian seaports regarding ICT integration. The potential benefits of PCS implementation in the Croatian seaports are stressed. Finally, a definite need for PCS implementation is determined, in order to achieve and maintain the Croatian seaport competitiveness in global maritime transport industry.


Cukrov N.,Ruder Boskovic Institute | Franciskovic-Bilinski S.,Ruder Boskovic Institute | Hlaca B.,Port of Rijeka Authority | Barisic D.,Ruder Boskovic Institute
Marine Pollution Bulletin | Year: 2011

We studied metal pollution in the sediments of Rijeka harbor, including anthropogenic influence during recent decades and at the present time. Sediment profiles were collected at ten sampling points. The concentrations of 63 elements in bulk sediment were obtained using ICP-MS, and the concentrations of selected elements were evaluated by statistical factor analyses. We also calculated metal-enrichment factors and geoaccumulation indices and constructed spatial-distribution maps. Mercury (Hg) was the heaviest pollutant, with concentrations exceeding 4. mg/kg. Silver (Ag) was the second most important pollutant, with constantly increasing values. The average concentrations of the most toxic elements were comparable to those found in sediments of other ports throughout the world, and their toxicity ranged from threshold values [chromium (Cr), arsenic (As)] and midrange-effect values [cadmium (Cd), lead (Pb), copper (Cu), zinc (Zn), nickel (Ni)] to extreme-effect values (Hg). Metal pollution has decreased during recent decades, except for Ag and barium (Ba). © 2010 Elsevier Ltd.

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