172.BROADBANDWIDTH VS DUAL FREQUENCY TRANSDUCERS : AN O&G EXPERIENCE

نویسندگان

چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Dual-Frequency Piezoelectric Transducers for Contrast Enhanced Ultrasound Imaging

For many years, ultrasound has provided clinicians with an affordable and effective imaging tool for applications ranging from cardiology to obstetrics. Development of microbubble contrast agents over the past several decades has enabled ultrasound to distinguish between blood flow and surrounding tissue. Current clinical practices using microbubble contrast agents rely heavily on user training...

متن کامل

Passive Materials for High Frequency Ultrasound Transducers

In this paper, the elastic properties of passive materials (matching, backing and lens materials) for ultrasound transducers are explored at room temperature in the frequency range of 25-65MHz using the ultrasonic spectroscopy method. AlurninaJEPOTEK 301 and tungsten/EPO-TEK 301 composites were fabricated and measured. Experimental results display a monotonic rise in acoustic impedance of the c...

متن کامل

Intersection of Multitape Transducers vs. Cascade of Binary Transducers: The Example of {E}gyptian Hieroglyphs Transliteration

This paper uses the task of transliterating an Egyptian Hieroglyphic text into the latin alphabet as a model problem to compare two finite-state formalisms : the first one is a cascade of binary transducers; the second one is a class of multitape transducers expressing simultaneous constraints. The two systems are compared regarding their expressivity and readability. The first system tends to ...

متن کامل

Dual frequency ultrasound-enhanced tissue plasminogen activator thrombolysis in an in vitro human clot model

Introduction: Stroke causes death and disability in patients throughout the world. At present, the only FDA- approved drug for ischemic stroke is recombinant tissue plasminogen activator (rt- PA). Unfortunately, rtPA can cause intracerebral hemorrhage and must use within limited time window (within 3-4.5 hour after onset of stroke). Ultrasound with rtPA loaded liposomes (rtPA_L...

متن کامل

Incentives vs. Control: An Analysis of U.S. Dual-class companies

Dual-class common stock allows for the separation of voting rights and cash-flow rights across the different classes of equity. We construct a large sample of dual-class firms in the United States and analyze the relationships of insider’s cash-flow rights and voting rights with firm value, performance, and investment behavior. We find that firm value is increasing in the level of cash-flow rig...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Japanese Journal of Radiological Technology

سال: 1995

ISSN: 0369-4305,1881-4883

DOI: 10.6009/jjrt.kj00001352662