introduction: transient cavitations induced by low frequency irradiation of ultrasound can be used to treat tumors. previous studies in in-vitro experiments have shown that induced cavitation by dual or multiple frequencies of ultrasound is greater than induced cavitation by single frequency irradiation. in this study, we compared and evaluated the treatment effects of dual frequency irradiatio...

The severity of pulmonary aspiration depends mainly on the acidity of the aspirate. Mist. magnesium trisilicate (MMT) has been used for many years at the maternity unit in General Hospital, Kuala Lumpur, to neutralise the acidic gastric contents in all obstetric patients requiring caesarian section. This preliminary study shows that a single dose of 15 mls of MMT before general anaesthesia rais...

More than 1.5 W of green light at 531 nm is generated by single-pass second harmonic generation in periodically poled MgO:LiNbO3. The pump laser is a high power tapered laser with a distributed Bragg reflector etched in the ridge section of the laser to provide wavelength selectivity. The output power of the single-frequency tapered laser is 9.3 W in continuous wave operation. A conversion effi...

Background: The placenta may be situated fully or partially to the lower uterine section, which is known as praevia. Although it seen in first trimester well, often occurs second third trimester. Placenta praevia main cause for antepartum hemorrhage vaginal bleeding. Objective: To assess frequency women with previous caesarean section. Methodology: current study was cross sectional study, carri...

Objective: To determine the frequency of repeat caesarean sections among women presenting at tertiary care Hospital. Subjects and Methods: This cross-sectional study was done Department Obstetrics Gynecology, Shaikh Zaid Women Hospital, SMBBMU Larkana. A total 345 older than 18 years with a history least one previous section regardless gestational age or parity were included. After taking clini...

Both Digital Audio Broadcasting (DAB) and Digital Video Broadcasting (DVB) systems use orthogonal frequency division multiplexing (OFDM) to facilitate single frequency networks (SFNs). In an SFN all transmitters transmit the same information in the same frequency block simultaneously. This transmitter diversity structure makes SFNs very efficient in fading channels with an excellent spectrum sa...

rthogonal frequency division multiplexing (OFDM) has been recently adopted by major manufacturers and by standardization bodies for a wide range of wireless and wireline applications ranging from digital video/audio broadcasting to power-line communications. The major virtues of OFDM are 1) its resilience to multipath propagation providing a viable low-complexity and optimal (in the maximum lik...

A new divide-and-conquer method for estimating the frequency of a single complex sinusoid in additive uncorrelated noise is proposed. Its computational complexity is comparable to previous fast methods (roughly 2N complex multiplies and log2(N) arctangents for N a power of 2). However, it nearly achieves the Cramer-Rao bound for a wider range of input frequency and signal-to-noise-ratio (SNR) v...

The estimation of the frequency of a single sinusoid embedded in additive white Gaussian noise is one of the classical problems of signal processing. It has importance in many applications in communications, where frequency estimation is used for decoding, and in radar processing and sonar processing. The problem of frequency estimation has been widely explored, but there is still room for a be...

Wireless asymmetric Internet access with a downlink peak bit rate of 10 to 30 Mb/s can be achieved by using the terrestrial digital video broadcasting system (DVB-T) as a supplemental downlink together with today’s cellular systems. This paper is a study of dynamic radio resource management on a packet-by-packet basis for this broadband downlink. The dynamic single frequency networks (DSFN) sch...