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Articles by S. Mohammadi
Total Records ( 7 ) for S. Mohammadi
  A. Binesh , S. Mohammadi , A.A. Mowlavi and P. Parvaresh
  Radioactive element radium produces radon gas with the alpha decay. Radon is a colorless gas without smell, weak, ineffective and over 50% radiation of the annual dose human body is involved. The two heavy radioactive elements in the natural decay chain from uranium and thorium is produced. Radon through breathing, eating and drinking enters the body. Alpha emission from gas and other radiations emitted from daughter nuclei of its short life makes serious damage to the respiratory system and into the human digestive, therefore after smoking this radiation is the second risk factor of lung cancer. In this study, the concentration of radium and radon in water sources, springs and rivers of Shandiz, Zoshk and Abrdeh regions (Mashhad-Iran) and using light and portable PRASSI system is measured. Total 120 samples including 38 samples of drinking water, 56 river water samples and 26 samples of spring water has been tested. A total of 19 samples had concentrations >11 (Bq L-1), the reference level set by the U.S. Environmental Protection Agency. Radium concentration of all samples was <1, only sample No. 21 related to drinking water of Shandiz city is about 2.2 (Bq L-1).
  H. Sadeghi-Bazargani , K. Mohammad , S. Arshi , S.R. Majdzadeh and S. Mohammadi
  Several software packages for sample size determination have been designed and presented up to now but nearly all of them need a user with a good knowledge about biostatistics and statistical tests. The aim of this research is to evaluate the primary version of a new software compared to some other available sample size software packages. Visual basic 6 was the language for programming. Algorithm used for designing sample size calculation is taken mainly from WHO recommendations in WHO different publications. For primary evaluation purpose, 23 academic staff of Ardabil University of Medical Sciences and Public Health School of Tehran University of Medical Sciences were selected and presented the different capabilities of software and then, designed questionnaire for evaluation of it was filled by them.
  M.A. Aazami and S. Mohammadi
  Seed priming and drying condition effects were investigated immediately after seed-priming and 9 week after the storage. In this experiment, carrot seeds of `Forto C.V.` were used. These seeds were individually primed for 10 days at 20 °C and in PEG (6000) (273 g L-1) and KNO3 (200 mmol) solutions. Then they were dried for 1 and 2 h at 15, 25 and 30 °C, respectively. One part of the seeds was stored at 5 °C in RH/45% For 9 week. Chemical priming effects, drying temperature as well as germination temperature on different traits especially germination percentage were significant. However, drying time had no significant effect on germination percentage after storage period. PEG priming and drying at 25 °C for 2 h provided the best condition for germination percentage. Using the best material for pre-priming, along with suitable drying management with appropriate quality and good conditions of the storage is important.
  B. Habibi-Asl , K. Hassanzadeh , H. Vafai and S. Mohammadi
  The goal of this study was to evaluate the effects of lamotrigine and magnesium sulfate on morphine induced tolerance and withdrawal symptoms in mice. Different groups of mice were received morphine (30 mg kg-1, s.c.) or morphine (30 mg kg-1, s.c.)+lamotrigine (10, 20, 30 or 40 mg kg-1, i.p.) or morphine (30 mg kg-1, s.c.)+magnesium sulfate (20, 40 or 60 mg kg-1, i.p.) or morphine (30 mg kg-1, s.c.) + [lamotrigine (10 mg kg-1, i.p.) + magnesium sulfate (20mg kg-1, i.p.)] daily for 4 days. Tolerance was assessed using hot plate after administration of a test dose of morphine (9 mg kg-1, i.p.) on fifth day. Withdrawal zsymptoms (Jumping and Rearing) were assessed by administration of naloxone (5 mg kg-1, i.p.) 2 h after the last dose of morphine in fourth day. It was found that administration of lamotrigine or magnesium sulfate or their combination decreased the morphine induced tolerance and withdrawal symptoms. From these results it is concluded that lamotrigine and magnesium sulfate alone or in combination could prevent the development of morphine tolerance and withdrawal symptoms. Glutamate release inhibitory effect of lamotrigine and its possible mechanism and property of magnesium, blocking the N-Methyl-D-Aspartate (NMDA) receptor calcium channel, is probably its mechanism on preventing morphine induced tolerance and dependence.
  A. Binesh , S. Mohammadi , A.A. Mowlavi , P. Parvaresh and H. Arabshahi
  Radon and its radioactive progenies in indoor places are recognized as the main sources of public exposure from the natural radioactive sources. The tap water used for drinking and other household uses can increase the indoor radon level. In the present research drinking water samples were collected from various places and supplies of public water used in Mashhad city which has about 4 millions population. Then radon concentration has been measured by PRASSI system three times for each sample. Results show that about 75% of water samples have radon concentration >10 Bq L-1 which advised EPA as a normal level. According to measurements data, the arithmetic mean of radon concentration for all samples was 16.238±9.322 Bq L-1. As well as the annual effective dose in stomach and long per person has been evaluated in this research. According to the advised of WHO and the EU Council, just 2 samples induced the total annual effective dose greater than 0.1 mSv year-1.
  A.R. Binesh and S. Mohammadi
  We have developed a special computing code for calculation of nuclear quadrupole moments versus deformation parameter δ. The calculated results for some heavy nuclei are compared with the 2001 experimental data which are the most new ones from Nilsson level diagrams we found new level energies for each nucleus by using new δ parameter, which would be useful for other studies that use Nilsson model and its diagrams. For some Isotopes, it has been seen that by increasing neutron number, deformation parameter also increase, which means more deformation from spherical shape.
  S. Mohammadi
  Klein-Gordon equation is a useful quantum mechanical equation for a certain class of particles. A problem with this equation arises however in the probabilistic interpretation of its solutions as representing a single particle. The difficulty with the Klein-Gordon equation is that it has both positive and negative energy solutions. This can be shown to give rise to antiparticles which must be included for self consistency. The Klein-Gordon equation can be used to solve the pionic atom in a relativistically correct way; it is only appropriate for spin-0 particles and thus does not apply directly to electrons and the real hydrogen atom. It is useful for pionic (π) and kaonic (K) atoms. In this study with the help of Klein-Gordon equation, we used for the first time a simple model to obtain the energy levels of a pionic atom.
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