25 research outputs found
Experimental study on the coefficient of lateral earth pressure in unsaturated soils
No full textAccurate measurement of lateral earth pressure coefficient, k, is a key step in any geotechnical investigation. Since conventional approaches for obtaining this value leads to high risk of uncertainty in the results, this paper introduces a new experimental approach for measuring the value of k, particularly in unsaturated soils. Details of the new instrument designed for this purpose is provided in the manuscript, which is capable of obtaining k value of unsaturated soils in a range of matrix suction or degree of saturation. Finally, some test results are presented that examine the accuracy of the novel apparatus in order to measure the coefficient of lateral earth pressure in unsaturated soils
Effect of clay content on the small and mid to large strain shear modulus of an unsaturated sand
No full textCritical state behaviour of an unsaturated clayey sand along constant water content direct shear and triaxial loading conditions
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Supported on Porous Ball‐milled Silicon, a Highly Selective Electrochemical Sensor for Glucose Determination
No full textPrioritizing the Determinants of Sour Lemon Marketing System Improvement Using Analytic Network Process (Case Study: Larestan County)
No full textCrop marketing has an important role in accomplishing goals such as agricultural development, production increase, and enhancement of farmers’ income in developing countries. Citrus production, especially sour lemon, is one of the most important productions in Larestan County, Fars province in Iran. So, the determinants of the sour lemon marketing system improvement were prioritized in Larestan in this study using Analytic Network Process (ANP) in which data were collected through a questionnaire filled by experts in the region. Criteria were the 4Ps (Product, Place, Promotion, and Price) in the marketing mix and here were also some sub-criteria for each of the criteria. The criteria and sub-criteria were chosen based on other studies and also experts’ views in the region. Results showed that product and promotion criteria had the first and last priorities in improving the sour lemon marketing system in Larestan County, respectively. In addition, proper packaging and designing to create a competitive advantage was the most important sub-criterion for improving the sour lemon marketing system in the region. Also, the creation of processing industries and using marketing cooperatives were the next most important sub-criteria, respectively. According to the results, it is suggested to develop proper packaging, processing industries, and marketing cooperatives in the region
Experimental Investigation of Unsaturated Silt-Sand Soil Permeability
No full textThe permeability of unsaturated silt-sand soil is important in many geotechnical and geoenvironmental challenges. Therefore, an appropriate method to evaluate silt-sand soil permeability is important, particularly in Iran where it received little consideration. In this in vitro research, different amounts of fine silt were evaluated on behavior of an unsaturated silt-sand soil with different grain size distribution using a new modified triaxial apparatus. Permeability was measured against matric suction and volumetric water content, and the results are compared against experimental models. The results indicated that the behavior of unsaturated sandy soil permeability could be determined as a function of matric suction, soil void size, and percentage of fine aggregate. Furthermore, the results appeared to imply that an increase of fine contents reduced the permeability, specifically at higher values of suction. This trend for the reduction of soil permeability was related to the increase in the amount of fine contents
Methicillin-Resistant Staphylococcus epidermidis in Iran: A Systematic Review and Meta-Analysis
No full textInvestigating the association of Val/Met polymorphism of the BDNF gene with the incidence of disease in patients with Alzheimer and comparison with healthy elderly people in Iran
No full textBackground: Alzheimer's disease is the most common cause of dementia in the elderly and the genetic and environmental factors interfere with its creation. The BDNF gene is responsible for producing a brain-derived neuronal factor. In this disease, the valine66methionine polymorphism and nucleotide changes of 196 (G>A) BDNF are genetic risk factors .This polymorphism has not been investigated in patients with Alzheimer's disease in Iran. This study aimed to provide appropriate information on the prognosis of the disease and the ability to get it. Materials and Methods: In this case-control study, 73 patients with Alzheimer's disease and 100 healthy controls were evaluated. Blood samples were taken from the subjects and DNA was extracted. After quantitative and qualitative DNA analysis, PCR-RFLP was performed and the results of both groups were analyzed and compared. Results: Fourteen patients and seven controls had polymorphisms of BDNF gene. Fifty-nine patients had normal allele, 8 patients with heterozygote allele and 6 patients had methionine/methionine allele. In the controls, 93 patients had normal allele, 5 with heterozygote allele and 2 had methionine/methionine allele. Conclusion: The findings of this study indicate that the increase in valine/methionine polymorphism in the BDNF gene in Alzheimer's patients compared to the control group can express the role of this polymorphism in this disease. Also, patients with this polymorphism had a worse clinical status than patients without this polymorphism. Therefore, evaluation of this polymorphism can provide appropriate information about the patient's condition
