[en] The response of a linear ratemeter vs. count rate is studied. The author establishes the upper limit of count rate variation about an average value in the case the indication establishment time is smaller than two time constant necessary to obtain a standard deviation. The lower limit of count rate variation with respect to the mean value has been established in order to obtain statistically significant results. The optimum working range for a linear ratemeter has been determined. The analytical equation of count rate resolution has been defined too. (author)

No abstract available

[en] This report consists of comparisons of prediction and experiment for German Standard Problem 4a, a blowdown experiment involving structural dynamic response. The comparisons presented herein are of the time histories of displacement, bending stress, and bending axis angle. The reasons for error in the predictions are discussed. The structural model is improved to obtain a better match with the experimental natural frequencies

[en] The study shows that the seismic response of two separated pics system is badly estimated by Rosenblueth's formula. Errors may reach 20% in the worst cases (little damping, one of the oscillators in a transitory phase, level ratio of the oscillators is nearly equal to 1). The averaged maximum is under-estimated in this case. To take these effects into account, we purpose a modified formula using the H function depending on the different parameters of the problem. This function is tabulated by numerical simulations. This tabulation is nearly complete except the cases of different dampings and both oscillators in the transitory phase. The proposed formula applies well to multi-degree of freedom systems even when their frequencies are close. The maximum is lightly overestimated. (orig./HP)

[en] A random search technique using a quasi random sequence is described in connection with non-linear optimization used to fit the photopeak distribution of a NaI(Tl) detector. The method is compared with a standard technique indicating potential uses of radom search. (author)

[en] The representative single-degree-of-freedom oscillator which responds to earthquake acceleration Z(t) is well known. The absolute acceleration response of this oscillator can be expressed approximately as a series with terms asub(n)(t), the detailed form of each term asub(n) accounting for the starting transient from quiescent initial conditions. The largest contributions to a(t) occur for the term asub(n) representing response at the natural structural frequency ω

[en] The changes that are being brought in the forms of organization of the power industry lead to a global restructuring of the industry. Traditional players are forced to redefine their strategies concerning vertical and horizontal integration and also diversification. They tend to internationalize their business but they are facing aggressive new-comers. The future structure of the industry is not yet determined but there will be a great number of very different corporate players. (authors). 1 fig

[en] We review the published data on the optical properties of beryllium for the spectral region from 0.03 to 300 eV. In the visible and infrared spectral regions, where published data from various authors show very large variations, we have performed experiments that identify the most probable sources of error, and use this information to select the best data from published sources. The effects of surface oxide overlayers have also been studied. In the far infrared spectral region, where only normal incidence reflectance data are available, and in the extreme ultraviolet, where only transmission data are available, there is insufficient information to fully determine the optical properties at each photon energy. Between 0.06 and 26 eV, however, a normal incidence reflectance curve is fully determined. This curve has been used for a Kramers endash Kronig analysis to determine the optical properties in this spectral range. 10 refs., 13 figs., 3 tabs

[en] This work is about the best answer in the face of emergencies situations that help the performer, evaluate or classify them according the emergency magnitude . The main tasks should be driven to save lives, to control of the situation and property protection.

[en] The paper describes a system of four 5 in x 5 in NaI(T1) detectors arranged in a ring around the scanning bed to measure total-body activity and activity in specific organs. The lateral response across the body volume is equalized by a partial screening of the outer regions of the body from the detector system. This is obtained by using a collimation system with rectangular openings and a special arrangement of the crystals inside the collimators. Uniformity in response in the longitudinal direction of the human body is achieved by means of the conventional scanning technique. To optimize the system parameters, calculations are performed by computing the detection efficiency and response of various geometrical arrangements of the detectors. In the calculation, the size and orientation of the detectors and the attenuation of gamma rays within the body as well as the shielding material and the detectors are taken into account. In the final system the adjustment of the response uniformity at the different gamma-ray energies and body sizes is achieved by shifting the detectors inside the fixed collimators along the crystal axis. The detection limits for isotopes with gamma-ray energies at about 1 MeV are in the order of 10^-8Ci. (author)