Filtyp
In Sweden a new research project started in December 2009. The project focuses on light weight constructions and its sound insulation characteristics with respect to subjective response, and it will be carried out during the period of December 2009 to December 2012. The main goal is to develop new evaluation criteria proposals, for the low frequency range and vibrations and their mutual interactio
Lightweight constructions of timber material are cost effective and demands relatively short production duration. One of the main drawbacks of lightweight structures, however, is related to the sound transmission. More and more complains arise against this type of structures, related to the propagation of low frequency vibrations induced by human activities. Most problems are caused by human walki
Each person has a very individual way of walking, though persons having the same sex and the same height, weight and age are likely to have similarities in the angle of the feet and the length of the stride. To simulate this, a number of Markov chains, that describe the stride, were created from experiments with 150 different males. The Markov chains were then used to create an artificial person f
Timber floors receive a lot of attention nowadays because of their advantages, such as cost effectiveness, recyclability. On the other hand, more and more complains arise again this type of structures, related to the propagation of low frequency vibrations induced by human activities. Most problems are caused by human walking, more exactly foot impacts, which generate a harmonic force whose freque
Multitone signals are often used as excitation for the characterization of audio systems. The frequency spectrum of the response consists of harmonics of the frequencies contained in the excitation and intermodulation products. Beside the choice of frequencies, in order to avoid frequency overlapping, there is also the need to choose adequate magnitudes and phases for the different components that
The characterization of a weakly nonlinear electroacoustic device with usual methods of measurement (THD, intermodulation) does not illustrate the nonlinearities themselves, but only some of their effects. Device linearization can be achieved by applying the inverse nonlinearity upstream of the device, under the condition that the nonlinearity law is known in detail. This paper presents nonlineari
Structure-borne sound attenuation of lightweight timber floor structures has been investigated by high-resolution numerical calculation methods. Two models have been studied both experimentally and numerically. The first considers a continuous chipboard plate and a supporting beam. The second considers two plates that are fastened on one beam. Damping effects, which arise from the two different di
Classical methods of characterization such as Total Harmonic Distortion, SMPTE Intermodulation or Difference Frequency Intermodulation, are widely used for electroacoustic device characterization. However, these methods only put in evidence some of the nonlinear effects for arbitrary excitations, resulting in non-ideal transfer functions, or interaction between two frequencies. More complex effect
In this study, we report on the three-dimensional (3D) characterization of a spray in terms of its droplet Sautermean diameter (SMD) using the laser-induced fluorescence (LIF)/Mie ratio technique. The spray structure isanalyzed for a multi-hole direct-injection spark ignition (DISI) injector. A calibration curve to convert theLIF/Mie ratio to droplet diameter is deduced using LIF/Mie imaging and a
BACKGROUND AND AIM: Albumin is a protein with multifaceted functions in the human body. According to many studies, lower serum albumin may be associated with depression in various groups of psychiatric and non-psychiatric patients, as well as with attempted suicide. As more severe depressive symptoms have been identified as a reliable risk factor for suicide in patients with high suicide risk, it
A device is provided for generating temporally offset , spa tially modulated illumination regions (22 , 22 ') having peri odic modulation patterns that are phase - shifted with respect to one another . The device has two pulsed laser sources (121 , 122) that are triggerable in a manner temporally offset with respect to one another and that generate two laser beams pulsed in a temporally offset man
New high-flux and high-brilliance neutron sources demand a higher count-rate capability in neutron detectors. In order to achieve that goal, the Solid-State Neutron Detector (SoNDe) project is developing a scintillation-based neutron detector. It will be capable of fully exploiting the available flux at small-angle neutron scattering (SANS) instruments at high brilliance sources, such as SKADI at
