it is over several decades that ultrasound is used to enhance the transdermal drug delivery (phonphoresis). the mechanism of the enhancement is not fully understood and the ability of ultrasound on the enhancement for some drugs is unclear. the effect of continuous wave 870 khz ultrasound at intensity of 1 w/cm 2 for 15 minutes on transdermal absorption of piroxicam from solution and gel formul...

In spite of wide spread investigations performed,the biological effects of ultrasound waves,specially on DNA molecule has not been fully understood.since any alteration in DNA molecule can lead to chromosome abnormality,the study of clastogenic effects of ultrasound is important.in this study,the effect of 1MHz frequency continuous waves with the power of 0.5,1 and 1.5 watts on G human lymphocy...

In this paper we give a variant of the classical second Massera’s theorem for threedimensional periodic systems, that satisfy different types of monotonicity assumptions.  2002 Elsevier Science (USA). All rights reserved.

Introduction: Phonophoresis is the use of ultrasound to enhancing cellular drug delivery through the skin. In this study the effect of clobethasole and hydrocortisone ointments phonophoresis on pain, knee osteoarthritis and some other symptoms was studied. Methods: An experimental single blind randomized clinical trial (RCT) was used. An available sampling technique was used for selection o...

hematuria is one of the most common genitourinary findings in children and extensive evaluation frequently fails to establish its etiology. ‎a known cause of hematuria in children is nephrolithiasis. ultrasound is a good method for diagnosis, but calculi less than 5 mm in diameter may not have a posterior shadow. calyceal microlithiasis (cm) is characterized by presence of hyperechogenic spots ...

in this research,the effect of power ultrasound (20 khz ,800 and 1000w) at 20.40 and 60 minutes on physico-chemical properties of two rice varieties tarom and neda was investigated and by the soaking method in controlled temperature (47°c) compared.results showed the maximum amount of water absorption of rice, observed at 60 minutes ultrasound treatment (1000w) and the lowest was observed in co...

A three-dimensional transport model, which uses winds from a stratospheric data assimilation system, is used to study the transport of supersonic aircraft exhaust in the lower stratosphere. A passive tracer is continuously injected into the transport model. The tracer source distribution is based on realistic scenarios for the daily emission rate of reactive nitrogen species for all forecasted ...

This study takes a chemical fiber factory’s spinning production line as the prototype to realize a threedimensional virtual simulation system. Geometric threedimensional models are constructed by exploiting the imagebased three dimension reconstruction technology, in which Harris algorithm is utilized to detect corners of the modeling objects. 3DSMAX is used to give each model a highly imitativ...

In this work, a statistical analysis on greenhouse simulations to estimate the efficiency of natural ventilation in a commercial twin-span greenhouse is presented. A numerical simulation approach was adopted using the theory of threedimensional computational fluid dynamics (CFD). With this approach, threedimensional patterns for temperature and airspeed inside the greenhouse were generated, usi...

placental site trophoblastic tumor (pstt) is a very rare variant of gestational trophoblastic tumor. it can occur after normal termination of pregnancy or spontaneous abortion and ectopic or molar pregnancy. there is a wide range of clinical manifestations from a benign condition to an aggressive disease with fatal outcome. one of the most important characteristics of pstt, unlike other forms o...