This article describes an integrated dualband multi-mode wireless LAN radio frequency power amplifier (Infineon PMB 8825) for 2.45 GHz and 5.25 GHz. The device has been realized in a 42 GHz-fT, 0.35μm SiGe-Bipolar high volume technology. The chip features two single-ended 3-stage power amplifiers for each frequency band and a control section that includes band select, standby and power control ...

Cognitive radio (CR) is a very promising technology of future wireless communications that has greater demands for antenna designs. One practical antenna is a reconfigurable antenna that has dual mode operations, i.e. scanning a free RF spectrum and transmitting or receiving information data via a CR link. One possible compact antenna configuration is based on the dipole or monopole that has na...

Section 1. Direct frequency-dependent selection (on any gene) generated by migration between two demes with different environments is negatively correlated with allele frequency. Section 2. Direct frequency-dependent selection is also generated by migration between demes with different environments if migration takes place before selection. Section 3. Dependence of parasite equilibrium allele f...

The frequency of muscle pain was studied in two groups of patients. One group consisted of 106 women undergoing Caesarean section; the other comprised 20 pre-menopausal women undergoing hysterectomy. Both groups received a single bolus injection of suxamethonium 100 mg to facilitate tracheal intubation. There was a statistically significant decrease in the frequency of muscle pain in the pregna...

Eigenvalue-based analysis of small-signal dynamics in high-voltage direct current (HVdc) transmission systems requires cable models that are compatible with a state-space representation. While distributed parameter accounting for frequency-dependent effects inherently incompatible representation, conventional π model can only represent the behavior accurately at single frequency. Instead, (FD- ...

The single-top production cross section is one third that of the top-pair production cross section at the LHC. During the first year of data taking, assuming an average luminosity of 10cms and a CMS energy of 14 TeV, the determination of the major contributions to the total single-top cross section should be achievable. Comparisons between the measured cross sections and the theoretical predict...

among 2357 prenant women at tehran valiasr hospital, 99 women under 18 years with their 102 neonates were evaluated retrospectively during aprill 1999 to april 2000. frequency of adolescent pregnancy was detected in 41.5 per 1000 live birth 7 (7.1%) of mothers had preeclampisa, 7 thyroidal diseases, 3 valvular heart diseases, 2 urinary tract infections and 20.3% of women had prolonged rupture o...