The Effects of Underwater Shock Wave Loading on the Physico – Mechanical Properties of Jute Fiber

The coffee beverage widely liked all over the world as articles of taste is extracted from roasted and milled coffee beans. The aroma with volatility compounds is a feature of coffee. A lot of extraction methods of coffee were researched. In this research, the underwater shock wave loading was tried to the roasted coffee bean to improve the extraction efficiency. The coffee extracted from the hot water by the filter method after the underwater shock wave loading compared the amounts of the extraction by the freeze-drying processing. In addition, extracted the volatility compounds were compared by the gas chromatography analysis. As a result, the change in the content of an excellent effect of the extraction and a volatility compound was confirmed.

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Behaviour of the peach under underwater shock wave loading

Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis ◽

10.11118/actaun200856040151 ◽

2008 ◽

Vol 56 (4) ◽

pp. 151-160

Author(s):

Libor Severa

Keyword(s):

Numerical Simulation ◽

Shock Wave ◽

Strain Rate ◽

Compression Test ◽

Static Loading ◽

Surface Velocity ◽

Shock Wave Loading ◽

Wave Loading ◽

Underwater Shock Wave ◽

Underwater Shock

The paper concerns with the experimental and numerical study of the peach (Red Haven) at underwater shock wave loading. The behaviour of the peach skin as well as peach stone can be described in terms of elasticity. Following experiments have been performed: tensile testing of the skin (exocarp) specimens at constant elongation at strain rate 0.01 s−1, compression test of the mesocarp specimens at different strain rates corresponding to quasi – static loading, compression test of the mesocarp specimens at the high rates of strain (about 1000 s−1), and compression test of the whole peach stone at strain rate corresponding to quasi – static loading. The model of the peach has been suggested. The model is used for the numerical simulation, which was performed on the software LS DYNA 3D finite element code. Pressure wave propagation in the water has been studied and following quantities evaluated: pressure on the peach surface, displacement, and surface velocity. Two different models (Maxwell and Kelvin) have been used. The results of this simulation show some agreement with results of the observation (undamaged peach skin). The numerical simulation also gives an insight on the details of the loading, which was recently tested as a tool of fruit treatment. It has been shown that undewater shock wave treatment of peaches can lead to their softening.

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On mechanism of non-heating sterilization using the underwater shock wave loading and gas formation

The International Journal of Multiphysics ◽

10.1260/175095407783419307 ◽

2007 ◽

Vol 1 (4) ◽

pp. 407-417

Author(s):

Ayumi Takemoto ◽

Masahiko Otsuka ◽

Shigeru Itoh ◽

Youhei Mibuka ◽

Masayoshi Iwahara

Keyword(s):

Shock Wave ◽

Shock Wave Loading ◽

Wave Loading ◽

Underwater Shock Wave ◽

Gas Formation ◽

Underwater Shock

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A theoretical investigation of the effect of structural stiffness in underwater shock wave loading using the plane wave approximation

International Journal of Multiphase Flow ◽

10.1016/s0301-9322(97)88570-9 ◽

1996 ◽

Vol 22 ◽

pp. 147

Author(s):

R Dawson

Keyword(s):

Shock Wave ◽

Plane Wave ◽

Theoretical Investigation ◽

Shock Wave Loading ◽

Structural Stiffness ◽

Wave Loading ◽

Underwater Shock Wave ◽

Wave Approximation ◽

Underwater Shock ◽

Plane Wave Approximation

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Effect of Number of Discharge Shot on Pit of Gelatin Simulating Biomaterial Attached with Microbubbles Subjected to Underwater Shock Wave Loading Induced by Electrical Discharge

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2019.j02104 ◽

2019 ◽

Vol 2019 (0) ◽

pp. J02104

Author(s):

Taketoshi KOITA ◽

Takahiro YAMAGUCHI

Keyword(s):

Shock Wave ◽

Electrical Discharge ◽

Shock Wave Loading ◽

Wave Loading ◽

Underwater Shock Wave ◽

Underwater Shock

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Shock Wave and Biotechnology

Emerging Technology in Fluids, Structures, and Fluid Structure Interactions ◽

10.1115/pvp2003-1972 ◽

2003 ◽

Author(s):

Shigeru Itoh

Keyword(s):

Shock Wave ◽

Shock Wave Loading ◽

Wave Loading ◽

Wave Load ◽

Underwater Shock Wave ◽

Living Thing ◽

Moisture Permeability ◽

Pit Membrane ◽

Underwater Shock ◽

Chemical Character

In order to clarify relation between chemical character and physical power, the test of shock wave loading for a living thing was carried out. In case of foraminifera, breeding from a fragment was confirmed in the observation test, after shock wave loading. And, as for the bivalve, the shell was very easy separated from organics. In the experiment of the underwater shock wave loading to a wood, alternative destruction of pit membrane realized improvement in moisture permeability. Furthermore, when the super-criticality disassembly experiment was conducted using the wood after shock wave load, the very good result was obtained.

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Promotion of Thawing Frozen Soil by Shock Wave Loading

Materials Science Forum ◽

10.4028/www.scientific.net/msf.767.205 ◽

2013 ◽

Vol 767 ◽

pp. 205-210

Author(s):

Toshiaki Watanabe ◽

Hideki Hamashima ◽

Hironori Maehara ◽

Kazuyuki Hokamoto ◽

Shigeru Itoh

Keyword(s):

Shock Wave ◽

Shock Loading ◽

Underwater Explosion ◽

Water Layer ◽

Frozen Soil ◽

Shock Wave Loading ◽

Wave Loading ◽

Underwater Shock Wave ◽

Underwater Shock ◽

A New Technique

The aim of study is to confirm a new technique that can crush the frozen soil and/or ice block using underwater shock wave generated by the underwater explosion of explosive. This technique can lead to the earlier sowing, which can have the larger harvest because the duration of sunshine increases. Especially, in Hokkaido prefecture, Japan, if the sowing is carried out in April, we can expect to have 150% of harvest in the ordinary season. This technique is effective against the cold regions, for example, Russia, Norway, and Sweden, etc. In order to check about that influence we tried to give an actual frozen soil a shock wave. We could get a result that existence of water layer serves an important role in promotion of thawing by the shock loading to the frozen soil. That role was confirmed from the result of numerical simulation.

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