Wyniki wyszukiwania - BazTech

1

Uszkodzenia nawierzchni na mostach i w strefie połączenia drogi z mostem

Germaniuk K.

Materiały Budowlane

|

2017

|

nr 4

80--83

PL

Koszt wykonania nawierzchni na obiekcie mostowym wynosi tylko ok. 0,5% jego budowy i tylko 0,25% kosztu budowy drogi. Są jednak obiekty, w przypadku których zwiększa się on do ok. 50% kosztu budowy odcinka drogi. Awaria nawierzchni na obiekcie mostowym może doprowadzić do wyłączenia długiego odcinka drogi z eksploatacji. Błędy powstałe podczas wykonywania robót o wartości 0,5% inwestycji mostowej mogą wygenerować koszty równe 20 ÷ 40% tej inwestycji. W artykule omówiono mechanizm powstawania najczęściej spotykanych uszkodzeń nawierzchni na obiektach mostowych i na połączeniu drogi z obiektem mostowym oraz podjęto próbę wyjaśnienia ich przyczyn.

EN

The total length of bridges is only 0,25% of the length of the national road network. However, there are buildings whose construction cost is about 50% of the cost of building a section of the road. The cost of building a pavement on a bridge is only about 0,5% of the bridge structure cost and only 0,25% of the road building cost. However the falture of the pavement on the bridge can load to the long ruming of the section of the road of operation. Error arising when pavement works with a vollue of 0,5% of the bridge investment can generale costs equal to 20 ÷ 40% of this investment ie 40 ÷ 80 times higher. This article discusses the mechanism of the formation of the most common damage on the pavement of bridge and the connection of the road to the bridge object and na attempt was made to explain their causes.

2

Influence of time of rest on the power decrease during exercising on the inclined plane

Witkowska I., Urbanik Cz., Karczewska M.

Acta of Bioengineering and Biomechanics

|

2012

|

Vol. 14, no. 3

17-22

EN

The aim of this paper is to investigate the influence of the time of rest on the change of maximal and average power as a function of time during training on an inclined plane. The values of power, developed during 7 series of 10 bounces with a 0.5 and 1 minute break, were analyzed. The research was conducted on 10 female students from the second year of master studies with a major of physical education. Taking into account the results obtained, which were compared to data from other sources, it is possible to conclude that the value of maximal power for the whole group examined during the training with a 0.5 minute break decreased by 22%, and for the training with a 1 minute break by 12%. One can assume that the training with a 0.5 minute break was more tiring, and for that reason students were not able to regenerate fully so as to bounce in the subsequent series. That is why one should say that the second method of training is more efficient for the evaluation of the maximal power of the contestant.

3

Identifying the cause of destruction of textile linear structures

Słodowy J., Rutkowska A.

Autex Research Journal

|

2004

|

Vol. 4, no. 3

129--136

EN

The article presents investigations into the mechanism of continuity loss of textile linear products. A method and tools for implementing it have been developed with the aim of investigating loose textile products, and determining the causes of their destruction. Special emphasis is placed on the usability of the procedure we accepted for investigating the resistance of the product's structure to the action of an aerodynamic force which occurs during the transport of weft with a weak structure. Two mechanisms of yarn breakage, especially that of loose wefts, have been differentiated. The first consists in breaking fibres which form the yarn, and the second in mutual slippage of fibres. Both mechanisms can be determined by analysing the force-elongation curves over yarn stretching in both static and dynamic conditions. The influence of an air stream acting longitudinally to the yarn, its velocity and time of action were also determined, with the aim of recognising the conditions of pneumatic weft transport.