Technical Transactions. Iss. 6

Technical Transactions. Iss. 6

Type: Collection of magazine numbers
Release date

Collection items (16)


The impact of long-term travel demand changes on mixed decision problems of mass transit lines construction and vehicles’ depots location

Sawicki, Piotr, Fierek, Szymon
Article
2018
The paper is concentrated on solving a mixed decision problem of mass transit line construction and vehicles’ depots location (MTLC&VDL). The authors have iteratively solved this problem as a function of scenariobased, long-term travel demand changes, and finally have analysed the generated results. As a product of the computations, it has been proved that the solution of the mixed MTLC&VDL decision problem depends on changes in travel demand, both in terms of the line construction and the location of the depot. 5 and 10% increase of travel demand leads to changes in the optimal mass transit line’s configuration, while the change of the optimal depot location takes place with 10% of the travel demand change. The results have implied a conclusion that to make strategic decisions on transport systems and solving mixed decision problems, forecasting travel demand changes (its volume and structure) over the long-term horizon has to be performed.

The modelling of technological processes at border transfer stations in Ukraine

Aleshinskiy, Evgen, Naumov, Vitalii, Pestremenko-Skripka, Oksana
Article
2018
In the process of the transfer of railway wagons between countries, the main role in processing the flow of cargo is assigned to a border transfer station. Additional border operations – such as customs, environmental, veterinary, phytosanitary, and epidemiological control – have led to a significant increase in the number of detained railway wagons. As a result of these increases, delays in the deliveries of both import and export cargoes have also increased. Reducing the duration of the delivery of goods by rail could be achieved through reductions in the times taken to process trains at border transfer stations – risk management systems based on the principle of selective survey operations in international traffic processing provide such an opportunity.

Active power measurement based on digital processing of voltage and current signals

Bień, Andrzej, Layer, Edward
Article
2018
The concept of active power measurement based on real-time digital processing of voltage and current signals is best’ introduced with a digital approximation definition. In this paper, the authors propose an integral calculation method based on Gregory’s expression, correction of integration period estimation and integration result correction taking values related to the ends of the integration period into account. In the described method, the integral is calculated between two consecutive maximums of the voltage and current product. Digital dependencies that are easy to implement are used for the evaluation of the active power value. To measure the voltage and current signals, the authors used a system with a digital signal processor and an A/D converter with a multiplexer followed by dedicated digital filters. The active power measurement method was checked by building an instrument simulation model.

Diazafluorene in 1,3-dipolar cycloaddiction reactions: short review

Kula, Karolina, Łapczuk-Krygier, Agnieszka
Article
2018
This review is an attempt to systemise knowledge within the field of 1,3DC reactions of diazafluorene with different dipolarophiles. This paper is arranged according to the dipolarophile structure. We are hoping that this review can help organic chemists who deal with the preparation of five-membraned heterocycles.

An analysis of the influence of selected factors on the accident rate in the construction industry

Hoła, Bożena, Nowobilski, Tomasz, Rudy, Jarosław, Czarnocki, Krzysztof
Article
2018
This paper presents the results of research aimed at constructing a linear mathematical model that determines the influence of selected factors characterising construction production on the accident rate in the construction industry. A number of linear multi-factor mathematical models were developed, which were then compared with each other, and those that best described the analysed phenomena were selected.

Adapting Cracow’s Stare Debniki area to the mobility needs of sight-impaired people

Banet, Krystian, Stypułkowska, Ewelina
Article
2018
An ageing society and the predicted increase in the visual impairment of older people requires attention to be paid to the accessibility and social inclusivity of urban spaces. This paper reviews spatial barriers with particular emphasis on the limited mobility of people with visual dysfunction. Furthermore, by the example of the Stare Dębniki area in Cracow, the paper includes improvement opportunities related to the accessibility of urban spaces. The detailed Let’s make noise project was developed at the ‘Przepis na miasto’ workshop.