The force, power and energy of the 100-meter sprint (2009)
At the 2008 Summer Olympics in Beijing, Jamaican athlete Usain Bolt broke the world record for the 100 m sprint. Just one year later, at the 2009 World Championships in Athletics in Berlin he broke...
Study of the Electron-Positron Annihilation Coincidence Peak Two-Dimensional Profile (2006)
O. Helene, V. R. Vanin, E. Do Nascimento, C. Takiya
Study of the Electron-Positron Annihilation Coincidence Peak Two-Dimensional Profile
Understanding the tsunami with a simple model (2006)
In this paper, we use the approximation of shallow water waves (Margaritondo G 2005 Eur. J. Phys. 26 401) to understand the behaviour of a tsunami in a variable depth. We deduce the shallow water...
Study of the Doppler Broadening of Positron Annihilation Radiation in Silicon (2006)
O. Helene, V. R. Vanin, M. Moralles, E. Do Nascimento
Study of the Doppler Broadening of Positron Annihilation Radiation in Silicon
Study of the Doppler broadening of positron annihilation radiation in silicon (2005)
Nascimento,E. Do, Helene,O., Vanin,V. R., Moralles,M.
We report the measurement of Doppler broadening annihilation radiation in silicon, using 22Na as a positron source, and two Ge detectors arrangement. The two-dimensional coincidence energy spectrum...
A unified model for the long and high jump (2005)
A simple model based on the maximum energy that an athlete can produce in a small time interval is used to describe the high and long jump. Conservation of angular momentum is used to explain why an...
Study of the electron-positron annihilation coincidence peak two-dimensional pofile (2004)
Nascimento,E. Do, Helene,O., Vanin,V. R., Takiya,C.
Positron annihilation radiation profi le in aluminum was observed with a pair of Ge detectors in coincidence. 22Na was used as a source of positron and the two-dimensional gamma energy spectrum wasfi...
One step self-calibration procedure in gamma-ray energy measurements (2003)
Guimarães-Filho,Z. O., Helene,O.
This paper presents a one step self-calibration procedure, based on the least squares method, to be used in gamma-ray energy measurements. The obtained equation allows a qualitative interpretation of...
Variances and covariances in deconvolution of multichannel spectra: 34S (g, n) cross section (2001)
Helene,O., Takiya,C., Vanin,V. R.
This paper discusses some aspects of deconvolution of one-dimensional spectra in the framework of the Least Squares Method and presents a minimum variance regularization procedure. Covariance...
The 0+..2+ neutrinoless double beta decay of $^{76}$Ge : results of the Frejus experiment (1990)
Busto, J., Dassie, D., Helene, O., Hubert, P., Larrieu, P., Leccia, F., ...
The 0+..2+ neutrinoless double beta decay of $^{76}$Ge : results of the Frejus experiment (1990)
Busto, J., Dassie, D., Helene, O., Hubert, P., Larrieu, P., Leccia, F., ...