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Search Results: 1 - 10 of 325542 matches for " S Bahrami "
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The Effect of Wheat Cultivar, Flour Extraction Rate and Baking Duration and Temperature on Dough Rheological Properties, Bread Staling and Organoleptic Properties
S. Bahrami,M. Shahedi
Journal of Science and Technology of Agriculture and Natural Resources , 2004,
Abstract: In this study, the effects of quality and quantity of protein in flours with 95% and 70% extraction rates obtained from Mahdavi and Tajan wheat cultivars each baked at two different durations (100 and 75 sec.) and temperatures (210 and 250°C), after wrapping in polyethylene packages with 40μm thickness were investigated. All tests were carried out during 168 hours after packing and at 24h intervals. Results indicated that bread staling was affected by wheat cultivar, flour extraction rate, and storage time. Bread prepared from Tajan flour had lower firmness and staleness than that prepared from Mahdavi. High bran content bread was firmer than that with lower bran content. Organoleptic tests indicated that bread baked with 95% flour and bread baked at high temperatures with short durations were not very acceptable.
Effect of Changing Solvents on Poly(-Caprolactone) Nanofibrous Webs Morphology
A. Gholipour Kanani,S. Hajir Bahrami
Journal of Nanomaterials , 2011, DOI: 10.1155/2011/724153
Abstract: Polycaprolactone nanofibers were prepared using five different solvents (glacial acetic acid, 90% acetic acid, methylene chloride/DMF 4/1, glacial formic acid, and formic acid/acetone 4/1) by electrospinning process. The effect of solution concentrations (5%, 10%, 15% and 20%) and applied voltages during spinning (10 KV to 20 KV) on the nanofibers formation, morphology, and structure were investigated. SEM micrographs showed successful production of PCL nanofibers with different solvents. With increasing the polymer concentration, the average diameter of nanofibers increases. In glacial acetic acid solvent, above 15% concentration bimodal web without beads was obtained. In MC/DMF beads was observed only at 5% solution concentration. However, in glacial formic acid a uniform web without beads were obtained above 10% and the nanofibers were brittle. In formic acid/acetone solution the PCL web formed showed lots of beads along with fine fibers. Increasing applied voltage resulted in fibers with larger diameter.
M Asadi,S Bahrami,R Ansari Samani
Jundishapur Journal of Natural Pharmaceutical Products , 2010,
Abstract: Cutaneous leishmaniasis is endemic in 88 different countries. There are an estimated 1.5 million new cases each year, with over 90% occurring in Afghanistan, Algeria, Iran, Iraq, Saudi Arabia, and Syria and in Brazil and Peru. This study is the first one for evaluating the effect of hydroalcoholic extracts of Stachys lavandulifolia Vahl. and Mespilus germanica L. leaves against L. major (MRHO/IR/75/ER) promastigotes. The results of this study showed that, extracts of S. Lavandulifolia and M. germanica leaves are effective on activity against the proliferation of promastigotes of L. major suggest that these extracts might be a promising approach for developing new anti-leishmanial drugs.
A Financial Approach to Evaluate an Optimized Combined Cooling, Heat and Power System  [PDF]
Shahab Bahrami, Farahbakhsh Safe
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.55036

Iran’s removing subsidy from energy carrier in four years ago leads to spike electricity price dramatically. This abrupt change increases the interest on distributed generation (DG) because of its several benefits such as lower electricity generation price. In Iran among all type of DGs, because of wide natural gas network infrastructure and several incentives that government legislated to support combined cooling, heat and power (CCHP) investors, this type of technology is more prevalent in comparison with other technologies. Between existing CCHP technologies, certain economic choices are to be taken into account. For different buildings with different load curves, suitable size and operation of CCHP should be calculated to make the project more feasible. If CCHP does not well suited for a position, then the whole energy efficiency would be plunged significantly. In this paper, a model to find the optimal size and operation of CCHP and auxiliary boiler for any users is proposed by considering an integrated view of electricity and natural gas network using GAMS software. Then this method is applying for a hospital in Tehran as a real case study. Finally, by applying COMFAR III software, useful financial parameters and sensitivity analysis are calculated.

Molecular Dynamic Study of Pull-In Instability of Nano-Switches  [PDF]
Sogand Hoshyarmanesh, Mohsen Bahrami
Advances in Nanoparticles (ANP) , 2014, DOI: 10.4236/anp.2014.33017
Capacitive nano-switches have been of great interest as replacements for conventional semiconductor switches. Accurate determination of the pull-in voltage is critical in the design process. In the present investigation, pull-in instability of nano-switches made of two parallel plates subjected to electrostatic force is studied. For this purpose, two parallel rectangular nanoplates with opposite charges are modeled based on molecular dynamics (MD) technique. Different initial gaps between nanoplates and its effect on pull-in phenomena are studied in addition to taking different values of geometrical and physical parameters into account to evaluate pull-in voltages. Here molecular dynamic simulations as an atomic interaction approach are employed for modeling of nano-switches in order to study pull-in instability considering atomic interaction and surface tension. Boundary conditions and also the van der Waals force are considered as important parameters to investigate their effects on pull-in voltage values.
A Generalized Rule For Non-Commuting Operators in Extended Phase Space
S. Nasiri,S. Khademi,S. Bahrami,F. Taati
Physics , 2005,
Abstract: A generalized quantum distribution function is introduced. The corresponding ordering rule for non-commuting operators is given in terms of a single parameter. The origin of this parameter is in the extended canonical transformations that guarantees the equivalence of different distribution functions obtained by assuming appropriate values for this parameter.
Comparison of concentric isokinetic dominant shoulder internal and external rotator torque between professional female volleyball and tennis players
S. Talebian,S. Bahrami,G.R Olyaei,H. Bagheri
Tehran University Medical Journal , 2006,
Abstract: Background: The purpose of this study was to measure isokinetic maximum and average peak torque of internal and external rotators of glenohumeral joint in volley ball and tennis players Methods: This study was performed on 17 professional female athletes (7 tennis players &10 volleyball players) with age ranged 18-28 years. The subjects had played in a skilled team for more than 3 years. They were free from injury to their dominant shoulder in the past year. Subjects performed a five minute warm up by shoulder wheel and Maximum average Peak Torque (APT) were obtained unilaterally by a Biodex System 3 with the arm of players in 90 degree abduction at 120,180 & 210 o/s. Players performed five trails of concentric movements with 30 second rest between them. Results: Maximum and average of maximum torques of shoulder rotator, in both groups, expect for internal rotators of tennis players, reduced by increase of movement speed (P<0.05). There are not significant difference between two groups in maximum, average of maximum torques and normalized data (ratio of maximum torque to weight). There is significant difference between two groups in percentage of APT of External rotator / Internal rotator ratio at 210 o/s (P<0.05). Conclusion: Volleyball and tennis have no effect on isokinetic strength of shoulder rotators. In high speed, ratio of External rotator / Internal rotator is reduced. This indicates that increase in movement speed increase internal rotator in comparison to external rotator in these professional female athletes.
Coupling of receptor interference and a host-dependent post-binding entry deficiency in a gammaretroviral envelope protein
Shervin Bahrami, Ditte Ejegod, Karina S?rensen, Finn Pedersen
Retrovirology , 2010, DOI: 10.1186/1742-4690-7-9
Abstract: We find unexpectedly that wild type SL3-2 envelope binds equally well to both permissive and non-permissive cells, indicating a post binding defect when interacting with the human Xpr1. Using replication competent viruses containing envelopes from SL3-2 or its mutants we find that the same amino acid mutations can dramatically alter the interference profile of this polytropic ENV, suggesting that the same amino acid changes that cause the post binding defect also influence interaction with the receptor.The envelope protein of SL3-2 MLV shows an entry defect on non-murine cells. This is coupled to a dramatically reduced ability to interfere with entry of other polytropic viruses. Two point mutations in the VR3 loop of the receptor binding domain of this envelope result both in a much increased interference ability and in removing the post-binding defect on non-murine cells, suggesting that both of these phenotypes are a consequence of insufficient interaction between the envelope and the receptorRetroviruses enter their host cells by binding to specific cellular proteins followed by fusion of viral and cellular membranes. This interaction is mediated by the viral envelope glycoproteins. The envelope protein is a single gene product that is post-translationally cleaved to give a surface subunit (SU), which is responsible for binding to the receptor, and a transmembrane subunit (TM) that mediates the fusion of viral and cellular membranes.The surface subunits of different viruses have evolved to use different cellular proteins as receptors. Even among closely related viruses, receptor usage can be markedly different. This is indeed the case for gammaretroviruses of murine and other species. At least five different receptors have been identified for this group including mCAT1 [1-3], Pit1 [4], Pit2 [5], Xpr1 [6-8] and Smit1 [9]. The greatest variation in species tropism is found in viruses that use Xpr1 as receptor. Within this group, xenotropic viruses can infect cells
Comparative Study of Resynchronization Conception Rate Based on Ovsynch 48 and 56 Hour in Dairy Cow
A. Bahrami,S. Mosaferi,H. Hamali,Z. Ostadi
Research Journal of Biological Sciences , 2012, DOI: 10.3923/rjbsci.2012.175.180
Abstract: The objective of this study was to compare two strategies for resynchronization of ovulation based on ovsynch 48 and 56 h in non-pregnant dairy cow diagnoses using trans rectal ultrasonography Lactating Holstein cows (n = 150) were submitted for postpartum Timed Artificial Insemination (TAI) using a Ovsynch 48 and 56 h protocol. After diagnosed non-pregnant, cows were randomly assigned to initiate resynchronization. Non-pregnant cows as determined by ultrasonography on day 30 post-AI and were divided into 3 groups. Cows in 1st group receiving an injection of PGF2α in 30 days and detected in estrus were inseminated and 2nd group receiving an injection of PGF2α 7 days after the initial GnRH injection and a 2nd GnRH injection 48 h after the PGF2α injection and 3rd group receiving an injection of PGF2α 7 days after the initial GnRH injection and a 2nd GnRH injection 56 h after the PGF2α injection and cows in both treatments were inseminated approximately 16-20 h after the 2nd GnRH injection. Therefore, pregnancy rates were evaluated for 3 groups that 1st group (n = 50) 18 pregnant and 32 non-pregnant, pregnancy rate in this group 36% and cows in the group 2 (n = 50) 11 pregnant and 39 non-pregnant, pregnancy rate in this group 22% and cows in the group 3 (n = 50) 16 pregnant and 34 non-pregnant, pregnancy rate is 32% and pregnancy rate between group 1 and 2 was significant p = 0.0044 (p<0.05), pregnancy rate between group 2 and 3 was significant too p = 0.0446 (p<0.05) and pregnancy rate between group 1 and 3 was not significant p = 0.5202 (p>0.05).
Development of Iranian Health R and D Performance Assessment Indicators
Soudabeh Vatankhah,S. Jamaladin Tabibi,Sogand Tourani,Mohammad Amin Bahrami
Research Journal of Biological Sciences , 2012,
Abstract: Iran s contribution to global scientific output was 29% in 2003 but the country has appointed in vision document (Iran 1404) to obtain first position of science, research and technology in her area in 2025. Therefore, Iran must assess her capacity of conducting high quality research and strength it regularly. Developing right indicators for health research performance assessment was the main purpose of this study. It had a complementary purpose of identifying the main problems of health research in Iran. This study was conducted in 3 phases including environmental scan, consultation and interviewing and consensus-building. First 2 phases leaded to a draft of potential indicators. We used modified Delphi technique for consensus-building in phase 3. After 3 rounds, 18 indicators obtained consensus, some of them have comparison base and some another relate to country s priorities. Also, we identified 8 main problems of Iranian health research system based on the viewpoints of the health professionals. The selected 18 indicators provide a useful instrument for assessing country s health research capacity. Also, decision makers can formulate suitable policies for health research with addressing main problems identified in this study.
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