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; 3–13
- 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; 14–24
- Vitali PODGURSKI
- Abstract. This research focuses on the dependence of
laser deposited YBa2Cu3O7–x 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; 25–47
- 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; 48–60
- 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; 61–69
- 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
8–12 ms–1. It is shown that increasing of the hub height
over the standard (30–40 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