scholarly journals Study on the application of ultrasonic wave in the removal of microbiofouling on PMMA surface

2021 ◽  
Author(s):  
Liang Zheng ◽  
Yufan Zeng ◽  
Yuefan Li ◽  
Jing Zheng
Keyword(s):  
Ultrasonic Wave ◽  
Pmma Surface

Ultrasonic wave effect on PMMA surface, silica nanoparticles assisted erosion

Wear ◽  
2013 ◽  
Vol 300 (1-2) ◽  
pp. 105-113 ◽  
Author(s):  
Farnaz Farbod ◽  
Behzad Pourabbas
Keyword(s):  
Silica Nanoparticles ◽  
Ultrasonic Wave ◽  
Wave Effect ◽  
Pmma Surface ◽  
Surface Silica

Ultrasonic Wave Scattering by a Line Crack in a Solder Joint

1999 ◽  
Vol 11 (1) ◽  
pp. 117-135
Author(s):  
P. Dineva ◽  
D. Gross ◽  
T. Rangelov
Keyword(s):  
Solder Joint ◽  
Ultrasonic Wave ◽  
Wave Scattering ◽  
Line Crack

THE ANALYSIS OF ULTRASONIC WAVE ATTENUATION SPECTRA IN STEELS

1983 ◽  
Vol 44 (C9) ◽  
pp. C9-337-C9-340 ◽  
Author(s):  
R. L. Smith ◽  
W. N. Reynolds ◽  
S. Perring
Keyword(s):  
Ultrasonic Wave ◽  
Wave Attenuation

Ultrasonic Wave Detection in Atmospheric Pressure Plasma Using Fraunhofer Diffraction Effect

PIERS Online ◽  
2010 ◽  
Vol 6 (7) ◽  
pp. 636-639
Author(s):  
Toshiyuki Nakamiya ◽  
Fumiaki Mitsugi ◽  
Shota Suyama ◽  
Tomoaki Ikegami ◽  
Yoshito Sonoda ◽  
...  
Keyword(s):  
Ultrasonic Wave ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Diffraction Effect ◽  
Fraunhofer Diffraction ◽  
Wave Detection ◽  
Pressure Plasma

Pengaruh Variasi Waktu Paparan Gelombang Ultrasonik dalam Mengurangi Jumlah Bakteri coliform pada Sampel Air Sungai Kahayan

2020 ◽  
Vol 4 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Neny Kurniawati, Kerelius, Sunariyati ◽  
Luqman Hakim, Dyah Ayu Pramoda Wardani, Widya Krestina ◽  
Dwi Tyas Setiawan, Ferry Purwanto, Diah K. Fatmala
Keyword(s):  
Water Treatment ◽  
River Water ◽  
Ultrasonic Wave ◽  
Exposure Time ◽  
Water Samples ◽  
Sampling Technique ◽  
Wave Exposure ◽  
Test Results ◽  
Time Data ◽  
Grab Sampling

Abstrak – Penelitian ini bertujuan untuk mengkaji pengaruh waktu paparan gelombang ultrasonik terhadap pengurangan jumlah koloni bakteri coliform pada sampel air sungai Kahayan. Pengambilan sampel air sungai dilakukan dengan teknik Grab Sampling menggunakan alat Kemmerer Sampler. Sampel air yang didapatkan diberikan paparan gelombang ultrasonik secara langsung, tanpa merubah kondisi lingkungan awal. Waktu paparan divariasikan pada 1 jam, 2 jam, 3 jam, 4 jam, dan 5 jam dengan frekuensi 40 kHz untuk memperoleh data waktu optimum. Uji coliform dilakukan dengan metode MPN, dengan tahapan uji pendugaan, uji penegasan, dan perhitungan koloni. Hasil uji MPN 24 jam setelah paparan menunjukkan bahwa penggunaan ultrasonik sebagai antibateri dapat optimum ketika diberikan paparan dengan waktu 3 jam, dengan efisiensi  96%. Kata kunci: antibakteri, coliform, ultrasonik, water treatment, sungai Kahayan  Abstract – This study aims to examine the effect of ultrasonic wave exposure time on reducing the number of coliform bacterial colonies in the Kahayan river water samples. River water sampling is done using the Grab Sampling technique using the Kemmerer Sampler tool. The water samples obtained were given direct ultrasonic wave exposure, without changing the initial environmental conditions. The exposure time is varied in 1 hour, 2 hours, 3 hours, 4 hours and 5 hours with a frequency of 40 kHz to obtain optimum time data. Coliform test was carried out by the MPN method, with the stages of the estimation test, affirmation test, and colony calculation. The MPN test results 24 hours after exposure showed that the use of ultrasonic as an antibody can be optimum when given exposure with a time of 3 hours, with an efficiency of 96%.Keywords : antibakterial, coliform, ultrasonic, water treatment, Kahayan river

scholarly journals Research and Prediction of Wettability of Irregular Square Column Structure on Polymethyl Methacrylate (PMMA) Surface Prepared by Femtosecond Laser

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 529
Author(s):  
Bangfu Wang ◽  
Juan Song
Keyword(s):  
Contact Angle ◽  
Femtosecond Laser ◽  
Prediction Model ◽  
Polymethyl Methacrylate ◽  
Groove Width ◽  
Complete Wetting ◽  
Column Structure ◽  
Pmma Surface ◽  
Incomplete Wetting ◽  
Wetting Model

Based on the contact angle prediction model of a traditional square column structure, the prediction models for wettability of a parallelogram square column structure (PSCS) on polymethyl methacrylate (PMMA) surface prepared by femtosecond laser were established. An experiment was conducted to analyze the rationality of the established complete wetting model and incomplete wetting model. It was found that the incomplete wetting prediction model of the square column structure was more in line with the actual situation. For PSCS, the length of both the long and short sides of the boss and the width of the groove exerted an impact on the contact angle prediction results. Under the condition that the length of the long and short sides of the boss remained unchanged and the groove width increased, the contact angle increased under complete wetting and incomplete wetting. In contrast, under the condition that the long side length of the boss and the groove width remained unchanged and the short side length of the boss increased, the contact angle increased under complete wetting but decreased under incomplete wetting. The maximum contact angle reached 135.65°, indicating that PSCS on PMMA surface enhanced the surface hydrophobicity of the material.

A tunable phononic crystal system for elastic ultrasonic wave control

2021 ◽  
Vol 118 (22) ◽  
pp. 224104
Author(s):  
Yihao Song ◽  
Yanfeng Shen
Keyword(s):  
Ultrasonic Wave ◽  
Phononic Crystal ◽  
Crystal System ◽  
Wave Control
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