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Articles by H. Ahmadi
Total Records ( 5 ) for H. Ahmadi
  H. Ahmadi , A.H. Hoorfar , H. Rahimi and A. Soroush
  Problem statement: At present study Constant Rate of Strain (CRS) consolidation under Non-Darcy condition was investigated.
Approach:In this study a governing conditions on pore water flow were investigated using proposed equation and experimental tests. CRS experiments under different rates of strain were conducted on different soil samples.
Results:Results of these experiments and there comparison with proposed equation showed that flow of pore water flow in the most part of each test was Non-Darcy and changed to Darcy condition in the final almost one forth of tests.
According to the results the threshold where Non-Darcy flow changes to Darcy was dependent on variations of relative pore water pressure versus total strain and it can be determined based on variations in inclination of relative pore water pressure-total stress curve.

  D. Nikkami , M. Shabani and H. Ahmadi
  The main objective of this research is to study the optimized combination of land allocation to different land uses like rangeland, orchard, irrigated farming and dry farming for minimized soil erosion and maximized people`s net income in Kharestan watershed located in the Northwest of Eghlid, Fars province, Iran. A multi-objective Linear Programming (LP) model was applied in three different land use scenarios including existing land uses plus land management (Scenario 1), existing land uses with some degree of land management (Scenario 2), and proper land uses plus land management (Scenario 3). The amount of soil loss and net benefit in each land use were computed and used as inputs to formulate the objective functions and governing constraints in optimization problem. The problem was solved using the simplex method with the help of LINGO software package and the optimal solution was ultimately determined. The results showed that in the optimized condition, while rangelands experience no change, the area of orchards should be increased from 561 to 2115 ha (377%), irrigated farms should be reduced from 871 to 237 ha (73%) and dry farming lands should be decreased from 1050 to 129 ha (88%). Also, by existing land management, land use optimization decreases soil erosion by 3.7% and increases net income by 163%. In existing land use some land management implementation, decreases soil erosion by 37% and increases net income by 206%, while in proper land uses and management, soil erosion decreases by 53% and net income increases by 208%. Sensitivity analysis showed that the area of orchards and rangelands are the most sensitive parameters and their changes have the highest effect on the amount of net income and soil erosion.
  K. Heidarbeigi , H. Ahmadi , K. Kheiralipour and A. Tabatabaeefar
  Khinjuk is oiling crop; therefore, physical and engineering properties are necessitate to determine for processing and equipment design. In this study, some raw material characteristics were determined for Khinjuk, in order to collect information about identifying some physical and mechanical properties of them. The average grain length, width and thickness were 5.49, 5.09 and 4.08 mm, respectively. The geometric mean diameter, thousand grain kernel and aspect ratio were 5.02 mm, 87.15g and 0.95, respectively. True density, bulk density and porosity were 1.01 kg m-3, 0.55 kg m-3 and 45 %, respectively while the static coefficient of friction varied from 0.45 on plywood surface to 0.56 on galvanized iron. The angle of repose for static and emptying were 48.33 and 23.74o degree, respectively. Whereas the failure force and elongation were 42.49 N and 1.35 mm respectively.
  Q. Behzadiyannejad , S.D. Siadat , M. Kheirandish , B. Tabaraiee , H. Ahmadi , D. Norouzian , S. Najar Peerayeh , M. Nejati and M.H. Hedayati
  Production of effective vaccine formulations is dependent on the availability of assays for the measurement of protective immune responses. Antibody- and complement-mediated phagocytosis is the main defense mechanism against Neisseria meningitidis. Therefore, a newly developed phagocytosis assay based on flow cytometry (flow assay) and the Serum Bactericidal Activity (SBA) assay were using sera obtained from rabbit postvaccination with the Outer Membrane Vesicles (OMVs) of Neisseria meningitidis serogroup B was done in order to evaluation of the potential efficacy of (experimental) meningococcal vaccines. The OMVs were injected intramuscularly into of rabbits with boosters on days 14, 28 and 42 after the primary immunization. Phagocytic function of and intracellular oxidative burst generation by rabbit PMN, against Neisseria meningitidis serogroup B, was measured with flow cytometer (Coulter Epics-XL-Profile USA), using dihydrorhodamine-123 as probes, respectively. SBA titers are given as reciprocal Log 2 values of the dilution giving at least 50% killing of the inoculum measured as colony forming units. The results of SBA titers and quantitative flow cytometric analysis of rabbit PMN function in hyperimmun sera with the OMVs revealed a highly significant increase in opsonophagocytic responses and bactericidal antibody against serogroup B meningococci after 56 day (p< 0.05). Both SBA and opsonic activity are crucial for the protection against meningococcal disease. In conclusion, we have shown a very high correlation between opsonic activity and SBA (r = 0.91). Present results indicated that the OMVs could be as a candidate for vaccine toward serogroup B meningococci.
  A. Adlimoghadam , M.H. Hedayati , S.D. Siadat , H. Ahmadi , M. Nejati , J. Vandyousefi and D. Norouzion
  The conditions of PCR were optimized in order to diagnose brucellosis from human serum samples. For this purpose, 16 serum samples, from confirmed brucellosis cases were examined. The specificity of a polymerase chain reaction assay for detecting Brucella DNA using primers specific for the amplification of a 223 bp region of the sequence encoding a 31 kDa immunogenic Brucella abortus protein (BCSP31) was evaluated. After modification, factors such as annealing temperature, time, concentrations of magnesium ion, dNTP, Taq and additives like Bovine Serum Albumin (BSA), dimethyl sulfoxide (DMSO), glycerol, gelatin, Tween 20 and Triton X-100 for enhancing PCR reaction were optimized. The optima conditions determined to be: PCR profile with annealing at 60°C for 50 sec optimum concentration of Mg2+(1.5 mM), dNTP(200 µM),Taq(1.25U), pH 8.3 and the relation between MgCl2 and dNTP concentration, Triton X-100, Tween 20 and BSA were found to be suitable additives.
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