Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Detection and Recognition of Environmental Sounds by Musicians and Non-Musicians

Miśkiewicz A., Rościszewska T., Żera J., Majer J., Okoń-Makowska B.

Archives of Acoustics

2018

Vol. 43, No. 4

581--592

The article reports three experiments conducted to determine whether musicians possess better ability of recognising the sources of natural sounds than non-musicians. The study was inspired by reports which indicate that musical training develops not only musical hearing, but also enhances various non-musical auditory capabilities. Recognition and detection thresholds were measured for recordings of environment al sounds presented in quiet (Experiment 1) and in the background of a noise masker (Experiment 2). The listener’s ability of sound source recognition was inferred from the recognition-detection threshold gap (RDTG) defined as the difference in signal level between the thresholds of sound recognition and sound detection. Contrary to what was expected from reports of enhanced auditory abilities of musicians, the RDTGs were not smaller for musicians than for non-musicians. In Experiment 3, detection thresholds were measured with an adaptive procedure comprising three interleaved stimulus tracks with different sounds. It was found that the threshold elevation caused by stimulus interleaving was similar for musicians and non-musicians. The lack of superiority of musicians over non-musicians in the auditory tasks Explorer in this study is explained in terms of a listening strategy known as casual listening mode, which is a basis for auditory orientation in the environment.

Numeryczna symulacja odlewania odlewu walcowego

Kovarik J., Majer J.

Zeszyty Naukowe Politechniki Poznańskiej. Mechanika

1998

Nr 45

59-68

We współpracy z Odlewnią Żeliwa ŚREM S.A. oraz z zespołem z Politechniki Poznańskiej przeprowadzono numeryczną symulację odlewania i krzepnięcia grubościennego odlewu z żeliwa szarego (kształt walca o wymiarach: średnica wewnętrzna 880 mm, średnia grubość ścianki 120 mm i długość 3035 mm). W symulacji wykorzystano kod symulacyjny PAM-CAST/SIMULOR wersja 97. W pracy uczestniczyli pracownicy biura CIM-MES (Warszawa).

Cast part of gray iron was thick wall cylinder around 3m high and 880 mm in outer diameter. Inside of cylinder a sand core was placed, outside was permanent gray iron mould. Casting gravity process was used with pouring out metall from basin placed on top part of the cylinder. Numerical simulation was performed using software PAM-CAST / SIMLTLOR. One simulation was made the basic set of input data obtained from foundry, another simulations represent input data variations to investigate the influence of pouring temperature and thermal resistance between cylinder and mould. Shrinkages have been predicted around inner surface in lower cylinder part where the thickness of wall is changed. Change of pouring temperature within =20 deg has negligible influence on shrinkage range, intensity and location positions. Change of thermal resistance is significant to predict a proper value of solidification time.