Showing 5 results for Azizzadeh
Volume 2, Issue 1 (Winter 2019)
Abstract
Knowledge is power (quoted from Ferdowsi), knowledge is really the ability. Science, economics and power affect each other. The interactive influences of science and technology, economy and power, are vital and widespread. The power of science, social contexts, economics context has revolutionized political thought and military power and crosses the natural boundaries and transformed the weight of the country's geopolitical.
Identifying the relationship between knowledge, economic situation and power has always been particularly importance. Studies show that in the term of economy, power, science and technology of each country are placed in a different position, and according to this position, their goals and policies are variable. In this regard, this study aimed to analyze the links between science and technology, economy and power of countries and tries to identify the relationship between the complements of science and technology, economy and power.
The research method of this paper is descriptive-analytic and data collecting method including the use of statistical resources and the study population included 37 countries which in a period of 9 years 2010 to 2018 in the form of three components were compared and evaluated.
The results indicate that there is a positive correlation between the indices of science and technology of countries and economic power, and there is a direct relation between economic power and political power of countries. In addition, countries that have a good position in terms of science and technology have a favorable position in terms of power.
Volume 7, Issue 3 (Summer 2019)
Abstract
Aim: The aim of this study was to determine the examination of relaxation training based on the PRECEDE-PROCEED model in anxiety reduction on nursing staffs.
Materials and Methods: Intervention studies were examined in Alzahra hospital on 64 members of the nursing staffs based on Spielberger anxiety questioner with higher anxiety score in 2016. We used Spielberger (State-Trait Anxiety Inventory) questionnaire for the measurement of the anxiety and for assaying predisposing, enabling and reinforcing factors, a questionnaire designed based on the PRECEDE- PROCEED model. Participants were divided randomly into 2 intervention and control groups. The educational training was carried out in 4 sessions for 45-60 minute in the intervention group. Questionnaire completion was done before, immediately and 4 months after the training. Data were analyzed in SPSS 22 (p˂0.05).
Findings: The results of this study showed that the mean of anxiety score before of training in two groups did not significantly (p=0.12), but after of training, the anxiety score was decreased significantly in the intervention group (p˂0.01). Also, after training, the amount of predisposing factors, enabling factors, and reinforcing factors increased significantly in the intervention group in comparison to control group (p<0.01).
Conclusion: Findings of this research confirm the effect of health education based on PRECEDE-PROCEED on taking health behaviors and promote people health. Intervention based on this model improved the quality of life in the nursing staff in our study.
Volume 16, Issue 88 (6-2019)
Abstract
Different species of Pseudomonas bacteria are found in abundance in nature. Although they are weak pathogens but they have great importance in the food hygiene and health because they are psychrophilic bacteria and can grow and proliferate at refrigerated temperatures and can produce proteolytic and lipolysis enzymes. In this study, the simultaneous effect of different doses of microwave radiation and different concentrations of lactic acid and salt on Pseudomonas aeruginosa bacteria inoculated into veal parts were studied. In this study, 108 specimens were evaluated in 9 treatments per day, 0,3,6,9, 12 15. And after refrigerating, microbial tests performed including Pseudomonas aeruginosa count and TVN chemical test. The control group was treated with distilled water. The bacterial count was done in Pseudomonas Agar medium. The effect of various concentrations of acid, salt, and microwave time on the logarithm of the bacterial count was evaluated over a 15-day refrigerator by Mixed repeated measure Anova. The results showed that different concentrations of acid, salt and microwave time and their interactions had a significant effect on the mean logarithm number of bacteria during refrigerating period.
Volume 17, Issue 101 (july 2020)
Abstract
Escherichia coli O157: H7 is one of the most important pathogens causing food poisoning in meat products. In this study, the antimicrobial effects of Lavandula angustifolia and NaCl on growth control of Escherichia coli O157: H7 inoculated into minced beef during storage were investigated. minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of Lavender essential oil for Escherichia coli O157: H7 were determined 0.625% and 1.25% by micro broth dilution method, respectively. Lavender essential oil was added to the minced meat in three concentrations (0, 0.5 and 1%) and NaCl in three concentrations (0, 2 and 4%). Subsequently, Escherichia coli O157: H7 was inoculated into minced meat at 105 CFU/gr. Minced meat treatments with Escherichia coli O157: H7 were counted on days (0, 3, 6 and 9) kept at refrigerated temperature (4 °C). The results showed that growth control of Escherichia coli O157: H7 of all treatments was significant (P<0.05) and mean log CFU/gr of bacterial count in 9 days was lower in all groups than control. Comparatively, the effect of NaCl alone was greater than that of essential oil alone. The greatest inhibitory effect was related to the simultaneous use of essential oil and NaCl.
Volume 19, Issue 1 (January 2019)
Abstract
Pulsed eddy current (PEC) technique is commonly used for the detection of sub-surface defects in electrically conductive metals. However, due to the limited penetration depth of eddy currents, the detection of sub-surface defects in ferromagnetic metals is limited while using PEC technique. In order to extend the application of PEC technique for the detection of sub-surface defects in ferromagnetic metals, the penetration depth of eddy currents needs to be increased. For deeper penetration of eddy currents in the material, magnetic saturation of the tested specimen is a useful solution. In magnetic saturation state, the magnetic permeability of the ferromagnetic metal is decreased and stabilized and, as a result, the penetration depth of eddy currents is increased. In this paper, the performance of the PECT for detection of sub-surface pitting defects in the magnetized ferromagnetic specimen has been investigated through finite element modeling (FEM) and experimental studies. The tested specimen is a 10mm-thick steel plate, in which sub-surface pitting defects with various depths have been modeled. A probe consisting of a driver coil, a pickup coil, and a ferrite core is used to measure the time-varying PEC signals. Then, the time domain features of the differential PEC signals are extracted and used to detect the sub-surface pittings. The results indicate that PEC technique together with magnetization can effectively detect sub-surface pitting defects.
