CONTENTS & ABSTRACTS
In English. Summaries in Estonian
Proceedings of the Estonian Academy of Sciences
Engineering

Volume 6 No. 1 March 2000

Building European competitive industries; 313
Matti OTALA
Abstract. The world technology scene changes constantly and the intercontinental migration is fast. In the past, Europe has been losing some major industries, such as the camera and the watch industries, but recently it has gained new foothold in the new emerging technologies. The massive applications of the mobile communications are today in the hands of the Finns and Swedes, while the Germans and the French hold the mass use of chip card applications. These cases hold promise to change the perception of Europe as a perennial loser in the technology warfare. What were the reasons for a success in building up these new industries? Will Europe be able to maintain its leading position in the new, emerging technologies? How will these new fields fertilize the technology infrastructure? These questions will be analysed in some depth.
Key words: camera industry, watch industry, mobile communications, smart card.

The influence of target surface alterations on pulsed laser deposited YBa2Cu3O7-x film properties; 1424
Vitali PODGURSKI
Abstract. This research focuses on the dependence of laser deposited YBa2Cu3O7x film properties on the depth of ablated target layers. The results demonstrate that the critical temperature Tc the second phase, and the morphology of the films are sensitive to the conditions of the target. The effect of laser glazing of the target is considered. In the case of thin films, Tc enhancement of the films deposited from the glazed target were observed.
Key words: laser glazing, YBCO, films.

Simultaneous calculation of heat, moisture, and air transport in a modular simulation environment; 2547
Jarek KURNITSKI and Mika VUOLLE
Abstract. A new one-dimensional model for simultaneous heat, moisture, and air transport calculations in a modular simulation environment has been developed. The model supplements the indoor climate and energy model library that is used for building simulation. The model may be used as a single independent model or as a component of a large model system. The humidity by volume is used as a moisture transfer potential, enthalpy is calculated, condensation is taken into account and all equations are solved simultaneously. The models contain only equations and the general modelling language functions at the same time as a source code and a readable document. The model was validated against analytical solutions and an existing program.
Key words: simultaneous heat, moisture, and air transport, modular simulation environment, modelling language.

Moisture convection around a crack by pressurization; 4860
Jarek KURNITSKI and Targo KALAMEES
Abstract. A laboratory test and computer simulation to determine the effect of moisture convection caused by inside overpressure around a leakage in a wooden floor construction was carried out. The purpose of the study was to test the accuracy of modelling the moisture convection with a one-dimensional model. It was assumed that the leakage airflow through a crack with known dimensions and glass fibre insulation is distributed over a certain area of permeable external wood fibreboard. This effective area was determined at the end of the laboratory test by measuring the area of visibly wet surface where condensation took place. By using effective area and airflow through the crack, the simulation was made with a modular simulation environment and a heat and moisture transfer model. The results show that moisture convection was possible to be modelled in one dimension with sufficient accuracy. The limit value of inside overpressure for the tested construction is given as well.
Key words: exfiltration, moisture convection, pressurization, one-dimensional modelling.

Wind dynamics in the Moonsund Archipelago; 6169
Teolan TOMSON and Maire HANSEN
Abstract. Wind speed dynamics measured during one year with an automatic wind station installed on the Harilaid Islet is analysed from the point of view of the wind energy utilization. Special attention is paid to the dynamic behaviour of wind in the speed range of 812 ms1. It is shown that increasing of the hub height over the standard (3040 m) adds to the annual energy yield about 1% per every added meter.
Key words: wind speed dynamics, wind energy utilization.

Instructions to authors; 70