Interest in application of physical processing methods, particular, ultrasound technologies, has grown significantly recent years. Ultrasonic technologies minimize the percentage water extracted oil. The main advantages ultrasonic treatment over numerous methods improving structural and mechanical properties heavy metals are its low energy consumption, high efficiency, technical environmental s...

how to cite this article: movahedian ah, heidarzadeh arani m, motaharizad m, mousavi gha, mosayebi z. evaluation of qt dispersion in children with breath holding spells. iran j child neurol. winter 2016; 10(1):25-30. abstract objective breath holding spells (bhs) are common involuntary reflexes in infancy and early childhood. differential diagnosis should embrace long qt syndrome (lqts) and par...

background anthracyclines are important components of many chemotherapeutic protocols. the present study aimed to evaluate the repolarization changes in electrocardiography (ecg) which may predict drug induced arrhythmia. materials and methods in this cross-sectional study, the recorded ecgs were assessed for qt dispersion (qtd), qt corrected dispersion (qtcd), t peak to tend dispersion (tped),...

Non-Destructive Testing of industrial components carries vital importance, both financially and safety-wise. Among all Non-Destructive techniques, Long Range Ultrasonic Testing utilizing the guided wave phenomena is a young technology proven to be commercially valid. Owing to its well-documented analytical models, Ultrasonic Guided Waves has been successfully applied to cylindrical and plate-li...

Ultrasonic vibration was employed in blending the nanosilica into epoxy resin to manufacture hemp/kevlar/nanosilica-based composites, with an ultrasonic occurrence of 20 kHz and a 900 W capacity power. An probe utilized ensure consistent dispersion nanoparticles epoxy. The mechanical characteristics hemp/kevlar fiber reinforced epoxy/nanosilica mat form have been studied. Hand layup procedures ...

Ultrasonic scanning experiments were conducted for detecting defects in wood pallet parts using rolling transducers. The characterization of defects is important for sorting and grading pallet parts, as well as for manufacturing quality and durable pallets. This paper reports the scanning results for stringers and deckboards – the two main components of pallet for red oak and yellow-poplar spec...

Abstract Polymethylmethacrylate bone cement is a standard material used as antibiotic carrier in the orthopedic surgery. The ultrasonic energy method capable of triggering biological effects based on both thermal and non-thermal mechanisms. aim current study to analyze methylene blue dispersion polymethylmethacrylate beads, association with acoustic field generated by ultrasound. Forty-nine spe...

High frequency acoustic waves confined inside a suspended core fiber (SCF) are revealed by numerical simulations for the first time. A standard single mode optical (SMF) is modelled to explain current research limitations. The response and energy concentrated in both fibers evaluated from 50 56 MHz with 3D finite element method. simulated dispersion curves compared Pochhammer–Chree solutions. S...