نتایج جستجو برای: Ultrasonic probe

تعداد نتایج: 120770  

Hossein Mirsaeedghazi, Mohammad Aboonajmi Mohammad Hossein Kianmehr Morteza Aliasghari Aghdam,

Microfiltration can clarify pomegranate juice; however, fouling is a limiting phenomenon in the process. In current work ultrasound was applied above and below the membrane surface to reduce fouling after removing temperature effect. A hydrophilic mixed cellulose ester membrane with pore size of 0.45 μm was used in lab scale flat sheet module. Membrane module was placed above and below the ultr...

Hossein Mirsaeedghazi, Mohammad Aboonajmi Mohammad Hossein Kianmehr Morteza Aliasghari Aghdam,

Microfiltration can clarify pomegranate juice; however, fouling is a limiting phenomenon in the process. In current work ultrasound was applied above and below the membrane surface to reduce fouling after removing temperature effect. A hydrophilic mixed cellulose ester membrane with pore size of 0.45 μm was used in lab scale flat sheet module. Membrane module was placed above and below the ultr...

Journal: :ماشین های کشاورزی 0
رسول معمار دستجردی سعید مینایی محمدهادی خوش تقاضا

non-destructive ultrasonic testing is one of the methods utilized to evaluate quality of agricultural produce. transducers used in this method are made for basically industrial applications. since ultrasonic attenuation of waves in agricultural produce is very high, industrial transducers cannot be used in agriculture and needs to be modified. this is done with horns that concentrate energy on ...

Journal: :The Journal of the Acoustical Society of America 1998

Journal: :Journal of dental research 2009
S C Lea B Felver G Landini A D Walmsley

Damage to tooth root surfaces may occur during ultrasonic cleaning with both piezoelectric and magnetostrictive ultrasonic scalers. It is unclear which mechanism causes more damage or how their mechanism of action leads to such damage. Our null hypothesis is that tooth-surface defect dimensions, resulting from instrumentation with ultrasonic scalers, are independent of whether the scaler probe ...

Journal: :فرآوری و نگهداری مواد غذایی 0
زهرا نصیری فر دانشجوی کارشناسی ارشد علوم و صنایع غذایی دانشگاه علوم کشاورزی و منابع طبیعی گرگان علیرضا صادقی ماهونک استادیار گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان فائزه کمالی دانشجوی کارشناسی ارشد علوم و صنایع غذایی دانشگاه علوم کشاورزی و منابع طبیعی گرگان

plants are rich source of phenolic compounds (phenolic acids, flavonoids and tannins) that are most important natural antioxidants. in the present study two ultrasonic methods including probe and bath were used for the extraction of phenolic and flavonoid compounds from celtis australis. the effects of different extraction time including 30, 60 and 90 min (bath method) and 5, 10 and 20 min (pro...

2009
Ting Wu Zhaoying Zhou Qun Wang Xing Yang Mingfei Xiao

Although ultrasound cavitation must be avoided for safe diagnostic applications, the ability of ultrasound to disrupt cell membranes has taken on increasing significance as a method to facilitate drug and gene delivery. A new ultrasonic resonance driving method is introduced to penetrate rigid wall plant cells or oocytes with springy cell membranes. When a reasonable design is created, ultrasou...

2005
A. La Rosa X. Cui J. McCollum N. Li

An ultrasonic transducer is incorporated into a near-field scanning optical microscope NSOM to augment its versatility to characterize the properties of layers adsorbed to a sample’s surface. Working under typical NSOM operation conditions, the ultrasonic transducer—attached underneath the sample—demonstrates sufficient sensitivity to monitor the waves generated by the tapered NSOM probe that o...

2005
Robert J. Siegel Michael C. Fishbein

The potential application of ultrasonic energy for ablation of atherosclerotic plaques was studied in human atherosclerotic arteries with continuous and pulsed delivery of energy. With a prototype ultrasonic wire probe (n=79 segments), there was gross reduction in vascular lesions as well as microscopic disruption of fibrous and calcified plaques. Normal portions of vessels appeared unaffected ...

2002
Mark K. Hinders John E. Lynch Gayle B. McCombs

A new ultrasonic periodontal probe has been developed that offers the potential for earlier detection of periodontal disease activity, non-invasive diagnosis, and greater reliability of measurement. A comparison study of the ultrasonic probe to both a manual probe, and a controlled-force probe was conducted to evaluate its clinical effectiveness. Twelve patients enrolled into this study. Two ha...

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