The application of small photon fields in modern radiotherapy requires the determination of total scatter factors Scp or field factors Ω(f(clin), f(msr))(Q(clin), Q(msr)) with high precision. Both quantities require the knowledge of the field-size-dependent and detector-dependent correction factor k(f(clin), f(msr))(Q(clin), Q(msr)). The aim of this study is the determination of the correction ...

This paper presents a study to calculate Pathlossusing “RF link budget analysis model” with a primary focus on a sub urban macrocell environment to calculate the pathloss during the propagation and to calculate the received signal power at receiver end and accordingly a correction factor factor will be introduced for suburban area in cost-231 hatamodel. Correction factor which is considered as ...

The main objective of the present paper is to introduce a new approach for measuring and calculation of fundamental power components in the case of various distorted waveforms including those containing harmonics. The parameters of active, reactive, apparent power and power factor, are measured and calculated by using Goertzel algorithm instead of fast Fourier transformation which is commonly u...

This method is used to improve the efficiency of motor drive by power factor correction. It plays an important role in energy saving during energy conversion. A cuk dc -dc converter topology reduced the power quality problems and improve the power factor at input ac mains. A three-phase voltage-source inverter is used as an electronic commutator operates the PMBLDCM drive The concept of voltage...

This paper presents three topologies of active 3 Phase Power Factor Correction Circuits which satisfy the following basic requirements: (a) near unity Power Factor, (b) Input current harmonics of below 5% THD and 3% SHD, and (c) Isolated DC output from the input utility. The need to satisfy the first 2 requirements is mandatory for compliance to MIL-STD-1399 shipboard power*. The last requireme...

Power factor correction of boost converter is done by using predictive control strategy. In this paper predictive control algorithm is presented based on this algorithm all of the duty cycles required to achieve unity power factor in one half line period are calculated in advance by proportional Integral (PI) controller, the simulation results show that the proposed predictive strategy for PFC ...

This paper deals with a new single ended primary inductance converter (SEPIC) for power factor correction (PFC). The proposed converter is used in combination with SEPIC and a valley fill circuit. The valley fill circuit improves the efficiency of the SEPIC by reducing the harmonics in the supply mains. The power factor is also enhanced compared to the conventional PFC converters. It uses the s...

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract In AC to DC converters, power factor has significant importance. Most power converters and equipments are developed to have power factor correction technology to improve their performance. A soft-switching two-switch resonant ACDC converter with hi...

In this letter, we reconsider a popular simplified received signal power model with single stream beamforming employed by the transmitter and the receiver in the regime when the beams have high gain and narrow beamwidth. We define the correction factor as the ratio of the average actual received signal power divided by the average received signal power using the popular simplified model. We ana...