حسن زندی

In the present work, a dynamic model of plasma current and its relation with the currents of active coils is derived using the Hamilton-Lagrange and energy functions. Model parameters of the plasma current are calculated using the analytical approach and the parameter estimation methods. The parameter estimation is performed based on the gray-box model. The experimental data of three shots in the presence of plasma in Damavand Tokamak have been used to estimate the parameters of the model. The results of plasma current modeling show a dynamic model with variable parameters as a function of plasma conditions and plasma position. In the present work, based on the obtained dynamical model, a robust PI controller has been designed to control the plasma current using the currents of the central solenoid and equilibrium coil. The simulation results using real experimental data indicate the acceptable performance of the designed control system.

With the increase in the number of the elderly, the international community has paid special attention to improving quality of life in the elderly population. Educating healthy lifestyle behaviors can be effective in improving health indices; therefore, the present study was carried out to determine the effect of healthy lifestyle education programs on the quality of life and health indices of the elderly. This semi-experimental study was conducted on elderly people referred to four vocational gardens (parks) of the city of Rafsanjan. The data were collected using Richter sphygmomanometer, Easy-glucometer and Seca weighting devices and a demographic questionnaire. The intervention group (36 elders) received healthy lifestyle education during 8 sessions, each lasting one hour. The posttest outcomes were measured immediately and two-months after intervention the data were analyzed using version 18 of the SPSS18 by t-tests, fisher and chi-square tests. The mean of systolic blood pressure immediately (p=0.003) and two months after intervention (p=0.006) was significantly different. However, the mean of diastolic BP (p=0.003) and blood glucose (p=0.005) decreased significantly only two months after the intervention. Education can not only increase the knowledge but also improve the quality of life of elders. Therefore, it is suggested that healthy lifestyle education programs be conducted via relevant organizations for the elderly.

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 considered in designing and constructing of this part. In order to finding permissible tolerances in construction and assembling of 200 kV electrostatic accelerator column, first the effects of angle deviation of a part from accelerator axis on beam track in the accelerator tube was simulated with Simion 7.0 computer program. We found that in order to prevent beam lost, the tolerances of balancing and co-centering of each part should be smaller than 0.1 mm. Each part of accelerator tube constructed by tolerances lower than 0.05 mm. Ultrasonic cleaning method used in pre-assembling process of parts. Because of its excellences, in the new tube we used borosilicate glass instead of high density alumina as insulators between the metallic electrodes. After three days of working vacuum pumps the system reached to 8.0×10-7 and after months to 5.0×10-7 ultimate pressure values. Measurements showed that by these considerations the maximum of reachable ion current on target was 1.1 mA which increased 50% compared to old machine, while x-ray emission intensity was increased by 25%. Optimizations of high voltage power supply are now under studies and tests

Following the successful design and construction of a 150keV accelerator tube, the construction of a 200keV electrostatic accelerator system at the Physics Department of the Nuclear Science Research School has been completed. This accelerator includes a 200keV accelerator tube, a high voltage power supply capable of supplying 200kV at 10mA current and a 200kV isolating transformer. An RF type ion source with a system for the control of ion beam could provide ions to the accelerator system. The vacuum system employed is a turbo molecular pumping system coupled with a mechanical rotary pump, where they can provide clean vacuum in the order of 7-10 Torr. In this paper the design criteria and some technical details of the construction of the accelerator system are presented. The construction of this accelerator provides a useful tool for research in various fields and gives an opportunity for the Iranian industry to develop and build accelerator components such as RF, vacuum and accelerator control systems.

[61Cu]Bleomycin ([61Cu]BLM) was prepared using [61Cu]CuCl2 produced via natZn(p,x)61Cu (180μA proton irradiation, 22MeV, 3.2h), purified by ion chromatography method. [61Cu]BLM was prepared at optimized conditions (room temperature, 45 min, 0.1 mg bleomycin for 2-10mCi 61CuCl2) with radiochemical purity over 98% determined by HPLC and RTLC. [61Cu]BLM was administered into the normal and tumor bearing rodents up to 210 minutes followed by biodistribution and co incidence imaging studies. A significant tumor/non tumor accumulation was observed either by animal sacrification or imaging method. [61Cu]BLM can be a potential PET radiotracer for tumor imaging.