Presence of 1/f noise in the temporal structure of psychoacoustic parameters of natural and urban sounds.

1/f noise or pink noise, which has been shown to be universal in nature, has also been observed in the temporal envelope of music, speech, and environmental sound. Moreover, the slope of the spectral density of the temporal envelope of music has been shown to correlate well to its pleasing, dull, or chaotic character. In this paper, the temporal structure of a number of instantaneous psychoacoustic parameters of environmental sound is examined in order to investigate whether a 1/f temporal structure appears in various types of sound that are generally preferred by people in everyday life. The results show, to some extent, that different categories of environmental sounds have different temporal structure characteristics. Only a number of urban sounds considered and birdsong, generally, exhibit 1/f behavior on short to medium duration time scales, i.e., from 0.1 s to 10 s, in instantaneous loudness and sharpness, whereas a more chaotic variation is found in birdsong at longer time scales, i.e., of 10 s-200 s. The other sound categories considered exhibit random or monotonic variations in the different time scales. In general, this study shows that a 1/f temporal structure is not necessarily present in environmental sounds that are commonly perceived as pleasant

Experimental Investigation of Radio Performance in . . .

Testing of the range and radiation pattern of wireless sensors is often not fully documented. In this paper, we perform a full characterization of the Tmote Sky motes from MoteIV Corporation. Packet yield, RSSI, and LQI are measured as a function of distance, angle, and transmit power, while taking environmental conditions into consideration. We aim to present a set of guidelines for setting up Wireless Sensor Networks that will enable them to achieve their QoS goals and maximum lifetime. Initial results show that the radio antenna pattern on the Tmote Sky device is not truly omnidirectional, that RSSI and LQI do not degrade solely as a polynomial function of distance, and that transmitting and receiving node heights have a major impact on link performance

OECD/NEA intercomparison of deterministic and monte carlo cross-section sensitivity codes using sneak-7 benchmarks

International audienceA sensitivity benchmark exercise was organized within the scope of the Uncertainty Analysisin Modeling (UAM) project of the OECD/Nuclear Energy Agency (NEA) to develop andcompare methods for the sensitivity and uncertainty computations of the effectivemultiplication factor (keff) and the effective delayed neutron fraction (eff). Several solutionswere received using different codes, both deterministic (SUSD3D, SNATCH) and MonteCarlo (TSUNAMI-3D, XSUSA, SERPENT2, MCNP6). In this paper the performances ofseveral codes and methods for the keff sensitivity and uncertainty computations are intercompared. The sensitivity and uncertainty codes were applied to the SNEAK-7A and -7B fastneutron benchmark experiments from the IRPhE database. Good general agreementbetween the sensitivities, both for integral values and sensitivity profiles, was observed