نتایج جستجو برای: cyclic accelerator
تعداد نتایج: 115130 فیلتر نتایج به سال:
background: in radiotherapy, wedge filters are used for optimizing the tumor dose distribution in patients. the attenuation in beam intensity due to the presence of wedge filter is compensated by means of a wedge factor measured at the central axis of the beam. the field size, depth and ssd dependence of wedge factor have been assessed for 9mv radiations of neptun pc linear accelerator. materia...
background : in spite of clinically useful photon and electron beams, high energy linacs produce secondary particles such as neutrons (photo-neutron production). neutrons have important roles during treatment with high energy photons in terms of protection and dose escalation. in this project, neutron dose equivalent of 18 mv varian accelerators is calculated by tld600 and tld700. materials and...
finite affine groups are given by groups of translations and di-lations on finite cyclic groups. for cyclic groups of prime orderwe develop a time-scale (wavelet) analysis and show that for alarge class of non-zero window signals/vectors, the generatedfull cyclic wavelet system constitutes a frame whose canonicaldual is a cyclic wavelet frame.
One of the most commonly used types of accelerators is linear electron accelerator. There is a project is in progress in Institute for research in fundamental sciences (IPM) aiming to design and build such an accelerator. It is defined in such a way that all parts to be built in Iran as possibly as it can. In this paper, after a brief explanation of the components of an electron linear accelera...
Purpose. The purpose of the article is to determine influence initial displacement windings on indicators an electromechanical induction accelerator a cylindrical configuration with pulsed excitation from capacitive energy storage and short-term alternating voltage source. Methodology. To take into account interrelated electrical, magnetic, mechanical thermal processes, as well number nonlinear...
Every synchrotron accelerator requires a pre-injector for primary injection of the electrons into the booster ring. The Iranian Light Source Facility (ILSF) pre-injector is a 150 MeV S-band linear accelerator with a thermionic cathode RF gun. The design of the pre-injector lattice and its beam dynamics calculation results together with the design of RF gun, alpha magnet, quadrupole magnets and ...
Error correction in high density multilevel cell NAND flash memories is of great concern and Low-DensityParity-Check (LDPC) codes are attracting much interest due to their Shannon-capacity-approaching behavior. In this work, the error performance of very large block length quasi-cyclic (QC) LDPC codes is evaluated through a high speed FPGA based emulator. A novel algebraic QC-LDPC code of rate ...
Optimizations on 200 kV electrostatic accelerator have been done in order to increasing ion current on target, improving vacuum condition and reduction in x-rays emission, increasing stability of high voltage power supply and reaching much greater achievable voltage value. The accelerator tube has most important effect on beam tracing in the electrostatic accelerators. So precautions most be co...
In this paper, we present an accelerator that is designed to improve performance of network processing applications, particularly layer seven networking applications. The accelerator can easily be integrated in Network Processors. We present the design details of two different FPGA implementations: a design where each task is implemented in the accelerator and another one where the accelerator ...
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