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Search Results: 1 - 10 of 287 matches for " Jamshid Mehrzad "
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Could Sputum Eosinophilia Act as a Predictive Test for Diagnosis of High Risk Bakery Workers to Asthma?  [PDF]
Omid Giahi, Mehrzad Ebrahemzadih, Jamshid Khoubi
Health (Health) , 2015, DOI: 10.4236/health.2015.71015
Abstract: Background: Occupational flour inhalation has been a culprit in the start of several pulmonary diseases such as asthma. We examined the relationship between occupational wheat flour inhalation in bakery and supermarket employees with pulmonary functions, respiratory symptoms, and sputum eosinophilia to determine hyper-responsiveness in a cross-sectional study in Iran. Methods: 122 subjects from traditional bakeries and 137 subjects from supermarket employees were enrolled in the study. Flour exposure concentrations, respiratory signs, sputum analysis, and respiratory volumes and capacities were measured based on the standard methods. Results: Respirable concentration of flour in the bakery workers was two- to four-fold of ACGIH’s threshold limit value in which bread-bakers with 2.2 mg/m3 experienced maximum exposures. The supermarket employees were not exposed to flour dust. The respiratory volumes in both bakery and supermarket employees were in the normal range. However, the median of voluminal percentage in bakery workers except Forced Vital Capacity (FVC) decreased (p < 0.001). The mean respiratory volume of bread-bakers was reduced compared to supermarket employees (p < 0.05). In addition, we observed increased respiratory symptoms in the bakery workers, again more prevalent in the bread-bakers. There was a significant correlation between flour exposure concentration and sputum eosinophilia in which the percentage of eosinophilia in the bread-bakers was more than other bakery and supermarket employees. Although there were reductions in the respiratory volumes, the results indicated no obstructive spirometric pattern. Conclusions: Sputum eosinophilia might be a suitable screening method to detect airway hyper-responsiveness in workers exposed to known asthmogens.
Quantitative Risk Assessment in Iran’s Natural Gas Distribution Network  [PDF]
Payam Amir-Heidari, Mehrzad Ebrahemzadih, Hadi Farahani, Jamshid Khoubi
Open Journal of Safety Science and Technology (OJSST) , 2014, DOI: 10.4236/ojsst.2014.41008
Abstract: Natural gas (NG) is one of the widely used domestic fuels in most of the countries, and because of economical and environmental advantages, its consumption is continuously increasing. As a result, complex piping systems are being installed to transport and distribute the gas for end users. Pipelines carrying NG are a significant source of hazard for their adjacent society. The risk of this hazard could be high especially in distribution network and urban areas where the population density is high. The common causes of accident in NG distribution network are: third party interference, corrosion, fatigue, stress corrosion cracking (SCC), etc. Accident in network leads to leakage and release of NG and consequent injuries and losses. To prevent these adverse outcomes, the risks should be identified and assessed carefully, so that they can be controlled and managed properly. In this work, risk assessment of NG distribution pipelines was surveyed and quantitative methods were recommended for assessing the individual and societal risks of distribution network.
Therapeutic Effects of Aqueous Extracts of Petroselinum Sativum on Ethylene Glycol-Induced Kidney Calculi in Rats
Jafar Saeidi,Hadi Bozorgi,Ahmad Zendehdel,Jamshid Mehrzad
Urology Journal , 2012,
Abstract: Purpose: To investigate the therapeutic effects of the aqueous extract of Petroselinum Sativum aerial parts and roots on kidney calculi. Materials and Methods: Thirty-six male Wistar rats were randomly assigned into 6 groups and treated for 30 days. Group A served as normal control and group B received 1% ethylene glycol in drinking water. Groups C, D, E, and F received 1% ethylene glycol from day 0 and were used as the treatment subjects. Rats in groups C and D received 200 and 600 mg/kg body weight of aerial parts aqueous extract, respectively, and those in groups E and F received 200 and 600 mg/kg body weight of root aqueous extract in drinking water, respectively, from the 14th day of the experiment. Results: On the 14th and 30th days of the experiment, serum level of magnesium (1.71 ± 0.12 and 3.81 ± 0.25, respectively) decreased significantly while serum level of calcium (10.45 ± 0.26 and 11.33 ± 0.18, respectively) increased significantly in group B compared with the control group (14th day: magnesium = 2.87 ± 0.17 and calcium = 8.80 ± 0.00 and 30th day: magnesium = 6.01 ± 0.00 and calcium = 8.30 ± 0.22; P < .001). In the treatment groups of C, D, E, and F, the number of deposits decreased significantly compared with group B on the 30th day (P < .001). The weight of the kidneys increased significantly in group B (2.01 ± 0.17) compared with the control group (1.52 ± 0.07) and decreased significantly in treatment groups (P < .05). Conclusion: Petroselinum Sativum has a therapeutic effect on calcium oxalate stones in rats with nephrolithiasis and reduces the number of calcium oxalate deposits.
Examination of the Level of Heavy Metals in Wastewater of Bandar Abbas Wastewater Treatment Plant  [PDF]
Gholamreza Mansourri, Mehrzad Madani
Open Journal of Ecology (OJE) , 2016, DOI: 10.4236/oje.2016.62006
Abstract: One of the main environmental pollutants is heavy metals. Due to extensive usage in industry, these metals enter biological cycle rapidly and contaminated water and soil resources rapidly. In this work, lead, copper, zinc and chromium of Bandar Abbas wastewater are examined. For this research, nine stations were set for measurement in urban level in Bandar Abbas and sampling of aforesaid metals was performed in fall and winter 2006 in these stations. After extraction and preparation operations using APDC-MIBK, samples were measured using flame atomic absorption system. According to results, concentrate of studied metals was lower than allowable standard value set by Iran environmental protection organization for agricultural purposes and sewage to ground level waters. In addition, efficiency of Bandar Abbas wastewater treatment plant to remove these metals is 40% - 70% from which highest removal is for zinc as much as 71.1% and lowest level is for copper as much as 40.5%. However, copper level was higher than allowable level for agricultural purposes in spring and summer (0.21 mg/L and 0.23 mg/L, respectively) and lower in fall and winter (0.103 mg/L and 0.098 mg/L, respectively). Furthermore, changes in concentration of metals in these stations in various seasons were measured and analyzed using one-way variance analysis and simultaneous effects of time and place on measured variables were analyzed using two-way variance analysis.
Head and Neck Cancer Treatment with Particle Beam Therapy
Mehrzad Zargarzadeh
International Journal of Computer Science Issues , 2013,
Abstract: In this century, cancer incidence has become one of the most significant problems concerning human. Conventional radiotherapy damage healthy tissue and in some cases may cause new primary cancers. This problem can be partially solved by hadron therapy which would be more effective and less harmful compared to other forms of radiotherapies used to treat some cancers. Although carbon ion and proton therapy both are effective treatments, they have serious differences which are mentioned in this paper and compared between the two methods. Furthermore, various treatments have been performed on head and neck cancer with hadrons so far will be discussed.
Experimental Study of Drying Process of COLZA Seeds in Fluidized Bed Dryer by Statistical Methods  [PDF]
Jamshid. Khorshidi, Hassan. Davari
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.21016
Abstract: In this study the effect of initial parameters such as inlet gas temperature, initial particles temperature and gas velocity on temperature changes of solid particles and outlet gas temperature in a fluidized bed dryer was studied. For testing, an experimental setup was established. With combination of air and Colza seeds belonging to D groups of the Geldart classification (Geldart, 1986) fluidization regime was carried out. With five test series with maintaining the inlet gas temperature, solid particle temperature and outlet gas temperature during time were carefully measured. To analyze these data by using regression analysis to predict solid particle and outlet gas temperature, 2 correlations on initial pa-rameters were presented. The result has shown that temperature gradients in the beginning of fluidization, is very high and therefore the exponential functions in the regression model is used to predict the temperature changes.
Design and Construction of a Spiral Heat Exchanger  [PDF]
Jamshid Khorshidi, Salman Heidari
Advances in Chemical Engineering and Science (ACES) , 2016, DOI: 10.4236/aces.2016.62021
Abstract: In this article, the performance and applications of a Spiral Plate Heat Exchanger are demonstrated. Also, governing equation of heat transfer phenomena in such heat exchangers is discussed. Regarding the governing equations, a LAB-sized model of this type of heat exchanger was designed and constructed. Galvanized Iron sheets were used as the heat transfer surfaces. Two Galvanized Iron sheets were rolled together around a central core and, as a result, two separated channels were made. Also, a predesign simulation of the heat exchanger was done using the Fluent software to predict the performance of the heat exchanger. First the geometry was made using Gambit software environment then the model was analyzed through Fluent. Because of less fouling, easier cleaning and high heat transfer coefficient, Spiral Heat Exchanger is a good alternative to the other types of heat exchangers, especially when it’s going to handle high fouling flows or highly viscous fluids. Low fouling rate of the heat exchanger, reduces the need of cleaning and therefore the out of service will be decreased. In the constructed heat exchanger, Nusselt number increases as the mass flow rate increases. Average Nusselt number is about 100 that is very good.
Sustainable Development and Socio- Economic Duality Using Fuzzy System-A Case Study of Iran  [PDF]
Jalil Khodaparast Shirazi, Mehrzad Ebrahimi, Mazda Moatari
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.23048
Abstract: Homogeneous development and decreasing of inequalities is a logical link between local and national program in macro level. Recognizing inequalities in the process of sustainable development play the major role for programmers. In this study, regarding the complicated qualification and qualitative of socio-economic indices, Iran provinces were ranked by fuzzy system during 2001-2006. In addition, duality in the concept of gap and differences among provinces were determined using the selected indices. Results showed that although country’s provinces became more homogeneous from the viewpoint of some of sustainable development indices, the distance among several provinces is still high and there is no clear relation among provinces during this study. This study shows that one development program cannot be effective for all areas of a country with socio-economic duality.
Broadband Coplanar Waveguide-FED Wide-Slot Antenna
Aliakbar Dastranj;Mehrzad Biguesh
PIER C , 2010, DOI: 10.2528/PIERC10041706
Abstract: A large bandwidth wide-slot antenna, fed by coplanar waveguide (CPW), is proposed. Experimental investigations and detailed simulations are conducted to understand its behavior and to optimize for broadband operation. The impedance bandwidth, determined by 10-dB return loss of the proposed slot antenna using both measurement and simulation, is about 131% (2.8 to 14 GHz). In addition to be small in size, the antenna has low cross polarization, relatively high gain, and it exhibits stable far-field radiation characteristics in the entire operating bandwidth. The design with very wide operating bandwidth and improved radiation pattern is obtained by properly choosing the suitable slot shape, selecting similar feed patch shape, and tuning their dimensions. Numerical sensitivity analysis has been used to understand the effects of changes of various antenna dimensions and to optimize the performance of the designed antenna. Based on our computer simulations it is shown that the antenna dimensions parameters have uncorrelated effects on the upper edge of the bandwidth. Simulation results show that the impedance matching of this kind of antenna is sensitive to the feed-slot combination and feed gap width. The simulated and measured results for return loss, far-field E-plane and H-plane radiation patterns, and gain of the designed antenna are presented and discussed.
The Role of Interventional Radiology in Treating Complications following Liver Transplantation
Homoyoon Mehrzad,Kamarjit Mangat
ISRN Hepatology , 2013, DOI: 10.1155/2013/696794
Abstract: Liver transplantation (LT) is used to treat both adult and pediatric patients with end-stage liver disease or acute liver failure. It has become more prevalent as both the surgical technique and postoperative care have improved resulting in a reduced morbidity and mortality. As a result, there are more patients surviving longer after liver transplantation. Despite this, there remain serious complications from the procedure that have a significant outcome on the patient and may result in retransplantation. At the same time, there have been significant advances in the field of interventional radiology both in terms of technology and how these apply to the patients. In this paper, we review the commonest complications, diagnostic tests, and interventional management options available. 1. Introduction Liver transplantation (LT) is used to treat both adult and pediatric patients with end-stage liver disease or acute liver failure. It has become more prevalent as both the surgical technique and postoperative care have improved resulting in a reduced morbidity and mortality. As a result, there are more patients surviving longer after liver transplantation. Despite this, there remain serious complications from the procedure that have a significant outcome on the patient and may result in retransplantation. At the same time, there have been significant advances in the field of interventional radiology both in terms of technology and how these apply to these patients. The main advantage is the ability to treat the common complications via a percutaneous minimally invasive manner reducing the need for further surgery with the aim of preserving the function of the transplanted liver. As a result, interventional radiologists have become an important member in the multidisciplinary transplantation team. The commonest method of liver transplantation is an orthotopic type (OLT) where the donor organ is placed in the same anatomical location as the original. The techniques described in this paper apply to deceased donor LT and living related LT (LRLT) both in the adult and pediatric population. In this paper, we aim to review the common complications following liver transplantation, the diagnostic tools available, and the available interventional treatments including potential complications. This paper is a review of the range of procedures offered by the interventional radiologist and is a mix of our experience in one of the largest transplant centers in Europe—at our institutes, we currently perform over 180 adult and pediatric liver transplants per year—and a review
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