Effects of Ultrasonic Irradiation on Ice Formation in Biological Tissue

2010 ◽  
Author(s):  
Yukio Tada ◽  
Yoshiaki Satou ◽  
Makoto Kurokawa ◽  
Akira Takimoto ◽  
Hajime Onishi
Keyword(s):  
Ultrasonic Irradiation ◽  
Biological Tissue ◽  
Ice Formation ◽  
Intensity Level ◽  
Ultrasonic Power ◽  
Promising Technique ◽  
Agar Gel ◽  
Supercooling Degree ◽  
Temperature Solution ◽  
Supercooled Region

A method to actively controlling crystallization is one of promising technique for cryopreservation. The object of this paper is to study the effect of ultrasonic irradiation on ice formation during freezing of biological tissue with supercooling. In the experiments, agar gel was frozen under irradiation of ultrasound at frequency of 28kHz. The measurements of temperature and the microscopic observation of ice crystals using fluorescent indicator were carried out. Firstly, it was found that the supercooled state was released by applying ultrasound at high intensity level, since ultrasonic cavitation effects were augmented. On the other hand, a weakly delay in the nucleation temperature was induced by applying ultrasound at low intensity level. Secondly, ice structure size decreased with increasing ultrasonic power under given supercooling degree at nucleation stage. The effect of ultrasound was enhanced by using large supercooling condition. Thirdly, paying attention to the thermal effect of ultrasound as changing temperature profile, sound and heat conduction in agar gel immersed in low temperature solution were numerically calculated. It was suggested that ultrasound at high frequency is effective to enlarge supercooled region.

C214 Effects of Ultrasonic Irradiation on Ice Formation in Biological Tissue

2007 ◽  
Vol 2007 (0) ◽  
pp. 251-252
Author(s):  
Yukio TADA ◽  
Akira TAKIMOTO ◽  
Haruki TUKAMOTO ◽  
Hajime ONISHI
Keyword(s):  
Ultrasonic Irradiation ◽  
Biological Tissue ◽  
Ice Formation

scholarly journals Surface modification of Cr‒Mo steel by new technology using high speed jet in water under ultrasonic irradiation

2018 ◽  
Vol 207 ◽  
pp. 03023
Author(s):  
Masataka Ijiri ◽  
Toshihiko Yoshimura
Keyword(s):  
Residual Stress ◽  
Corrosion Resistance ◽  
Surface Modification ◽  
Ultrasonic Irradiation ◽  
High Speed ◽  
Processing Time ◽  
Compressive Residual Stress ◽  
New Technology ◽  
Ultrasonic Power ◽  
Processing Times

In this study, to further improve current multifunction cavitation (MFC) techniques, the surface modification of Cr‒Mo steel was further investigated using 1200 W ultrasonic power. In MFC using 1200 W ultrasonic power, the corrosion resistance, and compressive residual stress of the specimens were improved when the processing time was 10 min; however, decarburization occurred at longer processing times, causing these characteristics to worsen. The decarburization that occurs at high ultrasonic outputs may be caused by an increase in the water temperature, and of the heating of the specimen surface.

scholarly journals Biological Tissue Modeling with Agar Gel Phantom for Radiation Dosimetry of <sup>99m</sup>Tc

2014 ◽  
Vol 04 (01) ◽  
pp. 44-52 ◽  
Author(s):  
Liliana Aranda-Lara ◽  
Eugenio Torres-García ◽  
Rigoberto Oros-Pantoja
Keyword(s):  
Biological Tissue ◽  
Radiation Dosimetry ◽  
Agar Gel ◽  
Tissue Modeling ◽  
Gel Phantom

Ultrasound-Assisted Acceleration of Soybean Oil Epoxidation and the Interfacial Tension Study

2011 ◽  
Vol 201-203 ◽  
pp. 2583-2586 ◽  
Author(s):  
Li Juan Han ◽  
Lin Li ◽  
Guo Qin Liu
Keyword(s):  
Fatty Acid ◽  
Reaction Time ◽  
Interfacial Tension ◽  
Soybean Oil ◽  
Ultrasonic Irradiation ◽  
Reaction Rate ◽  
Ultrasonic Frequency ◽  
Ultrasonic Power ◽  
Operational Parameters ◽  
Epoxy Value

This work was to reduce the epoxidation time of soybean oil with the assistance of ultrasonic irradiation and a kind of fatty acid as the catalyst in the presence of formic acid as the carrier of reactive oxygen. The operational parameters affecting the epoxy value of soybean oil, such as the amount of fatty acid and the ultrasonic frequency, ultrasonic power and reaction time were studied. And the interfacial tension of the aqueous-oil phase was decreased with the catalyst fatty acid adding or the assistance of ultrasonic irradiation, therefore the reaction rate could be accelerated. The maximum epoxy value of epoxidized soybean oil was 17.19% increased compared with the epoxy value that treated by non-ultrasound assistance in the same reaction time. Experimental results indicated that the epoxy value could be enhanced under the ultrasonic irradiation assistance, where the reaction time could be effectively reduced.

scholarly journals SONOCHEMICAL SYNTHESIS OF BIODIESEL FROM CATFISH FAT

2009 ◽  
Vol 12 (3) ◽  
pp. 51-61
Author(s):  
Thanh Hong Nguyen ◽  
Nguyen Tran Tu Nguyen ◽  
Thoa Thi Phuong Nguyen
Keyword(s):  
Phase Separation ◽  
Reaction Time ◽  
Ultrasonic Irradiation ◽  
Chemical Method ◽  
Product Formation ◽  
Biodiesel Fuel ◽  
Ultrasonic Power ◽  
Sonochemical Synthesis ◽  
Fuel Blend

Biodiesel was prepared from catfish fat by alkaline-catalyzed transesterification with methanol. Using ultrasonic irradiation considerably sped up the transesterification and the phase separation as well as reduced by-product formation in the product in comparison with the heat-chemical method. The basis factors, such as content of catalysts, reaction time, dissolved time of catalyst in methanol, mol ratio of reactants, ultrasonic power, etc. were investigated and optimized. Biodiesel yield was more than 90%. Obtained biodiesel fuel was up to the Vietnamese standard for biodiesel fuel blend stock (B100).

Algal Control by Low-Frequency, Low-Power Ultrasonic in Eutrophic Water Bodies

2012 ◽  
Vol 433-440 ◽  
pp. 811-816
Author(s):  
Deng Ling Jiang ◽  
Guo Wei Ni ◽  
Yu Min Zhang ◽  
You Po Su
Keyword(s):  
Low Power ◽  
Ultrasonic Irradiation ◽  
Irradiation Time ◽  
Algal Growth ◽  
Low Frequency ◽  
Water Bodies ◽  
Ultrasonic Power ◽  
Water Ecosystem ◽  
Power Ultrasonic ◽  
Algal Control

Ultrasonic cavitations can control algal growth. Considering water ecosystem protection and characteristics of ultrasonic technology, low frequency and low power ultrasonic was especially suitable to control algal growth in water bodies. Effects of low-frequency and low-power ultrasonic irradiation on natural blend algal growth were investigated. The algae spices were collected from a fresh water body. It mainly consists of Cyanophyta, Bacillariophyta and Chlorophyta. The results showed that ultrasonic irradiation with frequency of 60KHz, power of 0.24W/cm2 and irradiation time of 1min, inhibited algal growth significantly. Inhibition of ultrasonic irradiation on algal growth enhanced with ultrasonic power increased. Inhibition did not increase again When ultrasonic power exceeds 0.24W/cm2. The effect of algal control was sustainable by ultrasonic irradiation with interval period of 2-4 days.

Study on the Effect of Ultrasonic Waves on the Low Temperature Electroless Ni-P Plating on Copper Substrate

2011 ◽  
Vol 189-193 ◽  
pp. 1142-1145 ◽  
Author(s):  
Yong Jun Hu ◽  
Guang Hui Hu ◽  
Xiao Ling Cheng ◽  
Xiao Ting Xiao ◽  
Hai Yan Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Ultrasonic Irradiation ◽  
Copper Substrate ◽  
Ultrasonic Field ◽  
Ultrasonic Waves ◽  
Ultrasonic Power ◽  
Nodule Size ◽  
Power Increase ◽  
Irradiation Power ◽  
Electroless Ni

In this paper，electroless Ni-P plating on copper substrate at 50 °C in ultrasonic field was carried out. The frequency of ultrasonic waves was 40 kHz. The effect of ultrasonic on the composition, plating rate and morphology of Ni-P deposite was investigated at the ultrasonic power of 40, 70 and 100 W. The experimental results showed Ni-P deposit could not be obtained without ultrasonic field at 50 °C. The content of nickel and the thickness of Ni-P deposit increased with the ultrasonic waves power increase. Ultrasonic irradiation power remarkably refines the nodule size of Ni-P particles. The collapse of cavities in solution seems to suppress the Z-direction growth of the nodule.

scholarly journals Ultrasonic enhancement of photo-catalytic oxidation of surfactant

1999 ◽  
Vol 1 (1) ◽  
pp. 60-64 ◽  
Author(s):  
Yasuyuki Suzuki ◽  
Hiroki Arakawa ◽  
Akinori Maezawa ◽  
Shigeo Uchida
Keyword(s):  
Catalytic Oxidation ◽  
Ultrasonic Irradiation ◽  
Degradation Process ◽  
Alkyl Ether ◽  
Ultrasonic Power ◽  
Optimum Conditions ◽  
Power Ultrasound ◽  
High Power Ultrasound ◽  
Ultrasonic Standing Wave ◽  
Photo Catalytic Oxidation

Photo-catalytic oxidation of surfactant (polyoxyethylene-alkyl-ether,C14H29O(CH2CH2)7H, hereinafter referred as SS-70) enhanced by high power ultrasound is examined. The influences of the ultrasonic power and the stirring speed on the degradation rate are investigated. 1000 ml of 100ppm SS-70 is decomposed totally in about 20 minutes in the photo-catalytic process combined with the ultrasonic irradiation. Without ultrasonic irradiation, the decomposition needs more than 1 hour. The optimum conditions for the hybrid degradation process are discussed. It is found that the stirring speed largely influenced the degradation efficiency. It is considered that the catalyst particles might be localized by ultrasonic standing wave, and caused inhibition to the decomposition in the degradation process. However, by high stirring speed, the inhibition could be overcome.

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