Monitoring concept of single-frequency ultrasound and its application in dynamic crystallization processes

2015 ◽  
Vol 26 (3) ◽  
pp. 874-881 ◽  
Author(s):  
D. Pertig ◽  
M. Fardmostafavi ◽  
T. Stelzer ◽  
J. Ulrich
Keyword(s):  
Single Frequency ◽  
Dynamic Crystallization ◽  
Frequency Ultrasound

scholarly journals Bacterial Cell Inactivation Using a Single-Frequency Batch-Type Ultrasound Device

2021 ◽  
Vol 6 (1) ◽  
pp. 65-80
Author(s):  
Poetro Sambegoro ◽  
Maya Fitriyanti ◽  
Bentang Arief Budiman ◽  
Kamarisima Kamarisima ◽  
Sekar Wangi Arraudah Baliwangi ◽  
...  
Keyword(s):  
Bacterial Cell ◽  
Treatment Time ◽  
Low Cost ◽  
Single Frequency ◽  
Bacterial Cells ◽  
Cell Inactivation ◽  
E Coli ◽  
Commercial System ◽  
Ultrasound Device ◽  
Frequency Ultrasound

Ultrasound technology employs cavitation to generate high-pressure soundwaves to disrupt bacterial cells. This study reveals the effectiveness of a single frequency ultrasound device for bacterial cell inactivation. A low-cost ultrasound device having a single frequency, i.e. 22 kHz for lab-scale application, was developed first, and the prototype was mechanically designed and analyzed using the finite-element method to assure the targeted natural frequency could be achieved. The prototype was then tested inactivating bacterial cells, Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis), in a simple medium and a food system, and the results were then compared to a commercial system. A treatment time of up to 15 minutes was able to reduce E. coli and B. subtilis cells by 3.3 log and 2.8 log, respectively, and these results were similar to those of the commercial system. The effectiveness of bacterial cell inactivation using the developed single-frequency ultrasound device is then discussed. The findings are useful for designing low-cost ultrasound devices for application in the food industry.

Regeneration of Granular Activated Carbon Using Dual-Frequency Ultrasound

2012 ◽  
Vol 616-618 ◽  
pp. 1707-1710
Author(s):  
Jiong Yuan Lu ◽  
San Fan Wang ◽  
Jin Feng Zhu
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Experimental Results ◽  
Single Frequency ◽  
Dual Frequency ◽  
Thermal Regeneration ◽  
Regeneration Efficiency ◽  
The Individual ◽  
Better Than ◽  
Frequency Ultrasound

The saturate granular activated carbon(GAC) which adsorbed Ni2+ is regenerated using dual-frequency ultrasound. The individual frequency is 45KHz, 80KHz and 100KHz respectively. The experimental results show that the regeneration efficiency using dual-frequency ultrasound is better than that using single- frequency ultrasound under the same experimental condition. When the two ultrasound’s frequency is 45KHz, the regeneration efficiency is 81.03%, comparing single- frequency ultrasound it increase by 40% and it is the best in six group dual-frequency ultrasound. In conclusion, the dual-frequency ultrasound regeneration showed a possibility as an alternative to chemical and thermal regeneration of GAC.

Immobilized enzymolysis of corn gluten meal under triple-frequency ultrasound

2018 ◽  
Vol 14 (5-6) ◽  
Author(s):  
Wenjuan Qu ◽  
Raya Masoud Sehemu ◽  
Tian Zhang ◽  
Bingjie Song ◽  
Lan Yang ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Single Frequency ◽  
Antihypertensive Activity ◽  
Degree Of Hydrolysis ◽  
Corn Gluten Meal ◽  
Reaction Rate Constants ◽  
Triple Frequency ◽  
Corn Gluten ◽  
The Cost ◽  
Frequency Ultrasound

AbstractThe single frequency ultrasound mode is difficult to achieve an higher enzymolysis efficiency. The cost of protein enzymatic hydrolysis, using free enzyme is higher because the enzyme cannot be used repeatedly. Therefore, the effects of triple-frequency ultrasound (TFU) treatment on the performance, kinetics, and thermodynamics of immobilized Alcalase enzymolysis of corn gluten meal (CGM) were investigated in this research. The results showed that degree of hydrolysis (DH), peptide concentration, ACE inhibitory activity, and relative enzyme activity were increased by 20.6 %, 34.4 %, 24.1 %, and 25.8 %, respectively, by TFU treatment at the optimum conditions compared to the control. Kinetics and thermodynamic analyses revealed that TFU treatment successfully decreased the apparent constant (KM) by 27.0 % and increased the reaction rate constants (k) by 32.1 –200 % at 303.15–343.15 K. The energy of activation (Ea), enthalpy of activation (ΔH), and entropy of activation (ΔS) were reduced by 17.1 %, 15.2 –15.3 %, and 24.1 –31.8 %, respectively. Immobilized enzymolysis assisted by TFU was proved to be an efficient method to increase the enzymolysis efficiency, enzyme activity, and antihypertensive activity of the peptides through performance and mechanism discussion.

scholarly journals Erratum to: Comparing the in vivo sonodynamic effects of dual- and single-frequency ultrasound in breast adenocarcinoma

2012 ◽  
Vol 39 (4) ◽  
pp. 291-291
Author(s):  
Mahboobeh Alamolhoda ◽  
Manijhe Mokhtari-Dizaji ◽  
Amir Hoshang Barati ◽  
Hadi Hasanzadeh
Keyword(s):  
Single Frequency ◽  
Breast Adenocarcinoma ◽  
Frequency Ultrasound

Comparing the in vivo sonodynamic effects of dual- and single-frequency ultrasound in breast adenocarcinoma

2012 ◽  
Vol 39 (3) ◽  
pp. 115-125 ◽  
Author(s):  
Mahboobeh Alamolhoda ◽  
Manijhe Mokhtari-Dizaji ◽  
Amir Hoshang Barati ◽  
Hadi Hasanzadeh
Keyword(s):  
Single Frequency ◽  
Breast Adenocarcinoma ◽  
Frequency Ultrasound

Effect of Dual Frequency Ultrasound on the Bubble Formation in a Capillary Tube

2017 ◽  
Vol 139 (2) ◽  
Author(s):  
Benwei Fu ◽  
Nannan Zhao ◽  
Guoyou Wang ◽  
Hongbin Ma
Keyword(s):  
Bubble Growth ◽  
High Speed ◽  
Capillary Tube ◽  
Bubble Formation ◽  
Single Frequency ◽  
Quartz Tube ◽  
Outer Diameter ◽  
Dual Frequency ◽  
Heating Section ◽  
Frequency Ultrasound

A visual experimental investigation was conducted to determine the effect of dual frequency ultrasound on the bubble formation and growth in a capillary quartz tube. Two piezoelectric ceramics were used in this experiment. They were made of Pb-based lanthanum-doped zirconate titanates (PLZTs). The PLZTs were placed on a quartz tube with an inner diameter of 2 mm and an outer diameter of 3 mm. The capillary tube was vacuumed first and then charged with water using a filling ratio of 70%. The ultrasonic sound was applied to the heating section of a capillary tube. The bubble formation and growth were recorded by a high speed camera. As shown in figures, when the ultrasound with a single frequency of either 154 kHz or 474 kHz was applied, only one bubble was generated. When the dual frequencies of 154 kHz and 474 kHz were applied, more bubbles were generated. The speed of the bubble growth with dual frequency ultrasound was much higher than that with a single frequency. When a dual frequency ultrasound (154 kHz and 474 kHz) was used, the nucleation sites for bubble formation were significantly increased and the bubble growth rate enhanced.

Dual-Frequency Ultrasonic Desorption of Pb2+ from Coconut Shell Activated Carbon

2013 ◽  
Vol 777 ◽  
pp. 38-42
Author(s):  
Jian Zhou ◽  
San Fan Wang
Keyword(s):  
Activated Carbon ◽  
Metal Ion ◽  
Coconut Shell ◽  
Single Frequency ◽  
Dual Frequency ◽  
Cavitation Effect ◽  
Desorption Efficiency ◽  
The Stability ◽  
Coconut Shell Activated Carbon ◽  
Frequency Ultrasound

Desorption experiments of coconut shell activated carbon (CSAC) saturated with Pb2+had been conducted in presence of dual-frequency and single-frequency (30 kHz,500 kHz,1200 kHz) ultrasound. The desorption efficiency was better at dual-frequency ultrasound than at single-frequency ultrasound. The best of desorption efficiency of Pb2+was 65.5% at 500×500 kHz. The desorption efficiency of Pb2+increased by increasing temperature, but when the temperature was more than 50°C, the desorption efficiency decreased initially. The stability of CSAC was not affected with cavitation effect produced by ultrasound of frequency of 500×500 kHz. The carbon loss was less. The rate of loss was only 0.6%. In conclusion, ultrasound was used as alternative method to regenerate activated carbon adsorbing with heavy metal ion.

scholarly journals Single-Frequency Ultrasound-Based Respiration Rate Estimation with Smartphones

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Linfei Ge ◽  
Jin Zhang ◽  
Jing Wei
Keyword(s):  
Respiration Rate ◽  
Detection System ◽  
Experimental Result ◽  
Single Frequency ◽  
Respiration Activity ◽  
Respiration Monitoring ◽  
Rate Estimation ◽  
The Media ◽  
Frequency Ultrasound

Respiration monitoring is helpful in disease prevention and diagnosis. Traditional respiration monitoring requires users to wear devices on their bodies, which is inconvenient for them. In this paper, we aim to design a noncontact respiration rate detection system utilizing off-the-shelf smartphones. We utilize the single-frequency ultrasound as the media to detect the respiration activity. By analyzing the ultrasound signals received by the built-in microphone sensor in a smartphone, our system can derive the respiration rate of the user. The advantage of our method is that the transmitted signal is easy to generate and the signal analysis is simple, which has lower power consumption and thus is suitable for long-term monitoring in daily life. The experimental result shows that our system can achieve accurate respiration rate estimation under various scenarios.

Multi-Frequency Ultrasonic Extraction of Anthocyanins from Blueberry Pomace and Evaluation of Its Antioxidant Activity

2020 ◽  
Author(s):  
Ai-Jun Hu ◽  
Shu-Ting Hao ◽  
Jie Zheng ◽  
Lin Chen ◽  
Peng-Peng Sun
Keyword(s):  
Antioxidant Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Extraction Yield ◽  
Single Frequency ◽  
Ultrasonic Power ◽  
Extraction Temperature ◽  
Dual Frequency ◽  
Esi Ms ◽  
Frequency Ultrasound

Abstract Background A large amount of blueberry pomace is discarded and wasted. Objective To make full use of blueberry pomace and extract anthocyanins. Method Multi-frequency ultrasound was used to extract anthocyanins from blueberry pomace. The effects of different extraction conditions on the anthocyanin yields were studied. The antioxidant activity of anthocyanins was evaluated, and the main anthocyanin components were identified by HPLC-electrospray ionization (ESI)-MS/MS. Results The optimal anthocyanin extraction conditions were as follows: dual-frequency ultrasound of 40 + 80 kHz, ultrasonic power of 350 W, extraction temperature of 50°C, and extraction time of 40 min. Compared with single frequency (25 kHz) and tri-frequency ultrasound (25 + 40 + 80 kHz), the anthocyanin yield with dual-frequency ultrasound increased by 15.26% and 5.45% respectively. Furthermore, the antioxidant activities (DPPH, hydroxyl radical scavenging ability, and reducing power) of anthocyanins extracted with dual-frequency ultrasound were all higher than those without ultrasound. Seven kinds of anthocyanins were identified by HPLC-ESI-MS/MS. Conclusions Dual-frequency ultrasound had a higher extraction yield than single frequency ultrasound, tri-frequency ultrasound, and no ultrasound. Highlights Dual-frequency ultrasonic technology provides an effective approach for improving the extraction yield of anthocyanins from blueberry pomace.

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