Determination of Soil Characteristic Frequency Using Acoustic Techniques

2008 ◽  
Author(s):  
Jinwon Kim ◽  
Chung R. Song
Keyword(s):  
Characteristic Frequency ◽  
Soil Characteristic ◽  
Acoustic Techniques

Determination of the mechanical properties of PZT 65/35 using acoustic techniques

1978 ◽  
Vol 30 (3-4) ◽  
pp. 293-298 ◽  
Author(s):  
H. J. Sutherland ◽  
P. J. Chen
Keyword(s):  
Mechanical Properties ◽  
Acoustic Techniques

scholarly journals Determination of Characteristic Frequency for Identification of Hot Spots in Proteins

2012 ◽  
pp. 26-29
Author(s):  
Yashpal Yadav ◽  
Sulochana Wadhwani
Keyword(s):  
Hot Spots ◽  
Characteristic Frequency ◽  
Target Interaction ◽  
Protein Target ◽  
Resonant Recognition Model ◽  
Power Spectral ◽  
Alternative Approach ◽  
Target Binding ◽  
Consensus Spectrum

Identification of hot spots or protein-target binding sites in proteins using resonant recognition model requires the knowledge of characteristic frequency. For a successful protein target interaction, both the protein and the target signals must share the same characteristic frequency. The common characteristic frequency of a functional group of proteins is determined from the consensus spectrum obtained using DFT. In this work an alternative approach for identification of characteristic frequency using power spectral density is described. The performance of the proposed method is observed to be better than the DFT-based approach and is illustrated using simulation examples.

Determination of sewer roughness and sediment properties using acoustic techniques

2003 ◽  
Vol 47 (2) ◽  
pp. 87-93 ◽  
Author(s):  
K.V. Horoshenkov ◽  
R.M. Ashley ◽  
J. Blanksby
Keyword(s):  
Considerable Increase ◽  
Frequency Range ◽  
Sediment Properties ◽  
Relative Attenuation ◽  
Non Invasive ◽  
Sandy Layer ◽  
Acoustic Techniques ◽  
Wastewater Systems ◽  
Porous Sediments

Measurements have been carried out to determine the effect of porous sediments in a pipe on the attenuation and spectrum of the airborne acoustic field. The results show that the presence of even a relatively thin sandy layer results in a considerable increase in the acoustic attenuation over the broad frequency range. The measured value of the relative attenuation is in the range of 0.6 dB/m. The effect of the sediment on the acoustic spectrum is the reduction in energy of the propagating modes, which is an easily detectable phenomenon. These results pave the way for the development of the instrumentation for non-invasive characterisation of the parameters of sediments in wastewater systems.

scholarly journals Determination of Soil Characteristic Using SPAC Method in Karsiyaka-Izmir, Turkey

2017 ◽  
Vol 05 (02) ◽  
pp. 53-59
Author(s):  
Caglar Ozer ◽  
Senol Ozyalin ◽  
Oguz Ozel ◽  
Orhan Polat
Keyword(s):  
Soil Characteristic

scholarly journals Storability of paprika varieties measured by non-destructive acoustic method

2005 ◽  
Vol 11 (2) ◽  
Author(s):  
V. Muha ◽  
S. Istella ◽  
D. Tompos
Keyword(s):  
Acoustic Signal ◽  
Characteristic Frequency ◽  
Acoustic Method ◽  
The Other ◽  
Noisy Signal ◽  
Stiffness Method ◽  
Textural Changes ◽  
The Impact ◽  
Non Destructive

During our experiments, the storability of paprika (Capsicum annuum) samples was measured by a non-destructive acoustic method. The aims of our work were the determination of the applicability and reproducibility of the acoustic stiffness method for paprika, the investigation of the optimum measuring conditions. In order to compare the main paprika varieties regarding shelf-life, our further aim was to follow the softening phenomenon or textural changes (i.e. changes in stiffness) of different paprika varieties measured by the non­destructive acoustic stiffness method. Five different varieties of paprika grown in hydroponics growing system were used for the measurements. All paprika varieties were stored at 20 °C for two weeks. Samples were tested on every 2nd or 3rd day. The acoustic method was found to be suitable to follow the softening of paprika samples. The characteristic frequency of the acoustic signal could be well detected and clearly separated from the other vibration peaks. Tapping the top of the paprika was observed to give a clearer and less noisy signal compared to the signal obtained by tapping the sample's shoulder. The acoustic results showed the same tendencies with regard to softening during storage as the impact method showed in our previous experiments.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

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