Showing 8 results for Hashemin
Volume 8, Issue 2 (Summer 2018)
Abstract
Introduction The thoughts of Sheikh Ishraq (Shahāb ad-Dīn” Yahya ibn Habash Suhrawardī) have a high status in the Islamic world. These thoughts spread in the Safavid era, so that, more than ever, they became an important and influential category in the Islamic world. Since the art of architecture is the manifestation of the thoughts and mentalities of the architects and thinkers of each historical period, it can be expected that Suhrawardi’s thoughts are also manifested in the field of architecture. The main question of the research is whether the philosophy of Ishraq has influenced the Esfahani architectural style? And if so, how was this impact on the structure of the buildings of that era? In the following, using the interpretive-historical research method, the analysis of the views of Sheikh Ishraq and its comparative comparison with the architectural works of Esfahan doctrine were discussed. Then, using analytical-descriptive techniques, the correspondences between Suhrawardi’s thoughts and the architectural field of Esfahani style were explained. The data collection method is done by library research and referring to architectural documents.
Conclusion Studies conducted indicate that Esfahani style is significantly in line with the thoughts of Sheikh Ishraq. The various manifestations of light in the architecture of hierarchy, colors and decorations, empty space, the principle of plurality in unity, altar, golden dome, and so on can be considered as the effects of light in the architecture of this era.
Volume 12, Issue 2 (Summer 2022)
Abstract
Aims: This study aimed to investigate the effect of different planting plans, especially trees with varying characteristics of branch and leaf structure, height, canopy diameter, and density, leaf shape, and size, and compare the cooling effect under similar conditions to a suitable planting plan for maximum productivity.
Methods: The data collection method in this field and library research and the analysis method used are simulations, and the findings and comparison of results are quantitative and qualitative. Vegetation information of the site in the first stage is harvested, and the current situation is simulated, and its impact is determined. Then two new planting plans with the same amount of greenery in the current situation are designed and manufactured in the environment, and the results are compared.
Findings: The simulation results show that group planting mode is completely similar conditions in terms of plant species and the number of trees 0.85 ° C reduces the average air temperature compared to the linear planting mode and the biggest difference is in the average radiant temperature, which is more than 3 (3.18) ° C There is a temperature difference between group planting mode compared to linear planting mode and group planting mode has a lower average radiant temperature.
Conclusion: This study revealed the effect of the group planting plan factor, despite creating a full shade of trees and reducing the shading area of trees, improved the PMV thermal comfort index and improved environmental variables.
Volume 14, Issue 3 (2-2024)
Abstract
The activity of Wnt signaling pathway is increased in colorectal cancer. For this reason, finding new positive and negative regulators for this pathway is a treatment and diagnostic strategy of colorectal cancer. Our bioinformatics analysis indicated that hsa-miR-424 (miR-424) could be a possible regulator of the Wnt signaling pathway. Accordingly, the expression level of miR-424 in colorectal cancer tissues was elevated compared with normal pairs and the results of RT-qPCR showed a significant increase in miR-424 expression (p < 0.01). Then, molecular analyzes using Top/Fop Flash and RT-qPCR techniques indicated that miR-424 overexpression leads to increased Wnt pathway activity in the SW480 cell line. In addition, the small molecules IWP-2 and PNU-74654 were used to inhibit the Wnt signaling pathway, and the miR-424 overexpression suggested that exert its effect on the level of β-catenin complex degradation. Then, dual-luciferase assay validated the interaction between miR-424 and APC. Overall, our results suggest miR-424 is a positive regulator of the Wnt signaling pathway, and it could be a possible prognosis for colorectal cancer.
Volume 15, Issue 4 (6-2015)
Abstract
Active structural acoustic radiation control of a piezolaminated arbitrary thick rectangular plate with a mixed-norm H_2/H_∞ robust controller is developed. The structure is made of a transversely isotropic host layer with a distributed piezoelectric sensor layer as well as a matched piezoelectric actuator layer, facing high frequency uncertainties and random external disturbances. The elasto-acoustic formulation, based on the exact linear 3D piezo-elasticity theory, is developed for problem of fully coupled structure and acoustic mediums. Identification of the fluid/structure interaction system with subspace algorithm is implemented on actuator/sensor data sets. A multi-objective controller with regional pole placement, formulated in LMI framework, is synthesized while unmodeled dynamics are treated as multiplicative uncertainties. Numerical simulations confirm effectiveness of the implemented multi-objective robust active control scheme for reduction of radiated acoustic power from a piezocomposite plate, without stimulating any instability. Also, better tracking performance and disturbance rejection of mixed-norm controller is observed in comparison to that of H_2 and H_∞ controllers. Finally, validity of the elasto-acoustic model is proved by results obtained from a finite element software, as well as with the data available in the literature.
Volume 15, Issue 83 (12-2018)
Abstract
Honey is a natural substance produced by honeybees and flower nectar. It has complex compounds such as carbohydrates (fructose and glucose), phenols, organic acids, amino acids, proteins, minerals, vitamins and lipids. Organophosphorus pesticides, as diazinon, are used more than other pesticides due to their effect on a wide range of pests and also cheap price. It is noteworthy that diazinon is in category 2 in the classification of the World Health Organization and is considered as a relatively hazardous pesticide. In this regard, in the present study, the amount of residue of diazinon in honey produced in Damavand region was measured with the aim of providing the health of consumers and preparing the ground for qualitative control of this product. The honey samples used in this study were prepared from six areas of Ayeneh Varzan, Aro, Havir, Mosha, Tar Lake and Damavand in June and September. Then, the separation and detection of toxin were done by HPLC. According to the results, the residue of toxin was observed in all sampling areas so that in some areas the amount of residual was higher than the maximum residue level (MRL). Also, the residue in June in all samples was more than the samples harvested in September. In this regard, the highest amount of residue was measured in June in Ayeneh Varzan (0.03919 ppm) and its lowest amount was measured in September in Havir region with the amount of 0.1714 ppm.
Volume 15, Issue 85 (3-2019)
Abstract
Abstract
Honey is a supersaturated solution that contains fructose and glucose. Honey also contains minerals, proteins, amino acids, enzymes and vitamins. There is a wide range of partial compounds in honey that many of them have antioxidant properties. These compounds include phenolic acids and flavonoids, some enzymes (glucose oxidase, catalase) and amino acids. Fluvalinate is an insecticide, acaricide broad spectrum of pyrethroids products that can be used in bee hives, gardens, greenhouses and disinfection of cuttings. In this regard, in the present study, the amount of residue of fluvalinate in honey produced in Damavand region was measured with the aim of providing the health of consumers and preparing the ground for qualitative control of this product. The honey samples used in this study were prepared from six areas of Ayeneh Varzan, Aro, Havir, Mosha, Tar Lake and Damavand in June and September. The separation and detection of toxin were done by GC-MASS. Based on the results, the residue in June in all samples was more than the samples harvested in September. In this regard, the highest amount of residue was measured in June in Ayeneh Varzan (0.077 ppm) and the lowest was measured in September in Mosha (0.021 ppm).
Volume 19, Issue 130 (December 2022)
Abstract
The chemical constituents of n-hexane extract of Mentha arvensis (wild mint) native to Meshginshahr and Namin region, and the antimicrobial effect of the extract against Pseudomonas aeruginosa (ATCC 27853) and Bacillus cereus (ATCC 11778) were studied in this research using broth and agar dilution methods (assessment of minimum inhibitory concentration, MIC, and minimum bactericidal concentration, MBC) and disk diffusion method. The results showed that cis-piperitone epoxide, piperitenone oxide and pulegone were the main components of the extracts. In addition, the MICs and MBCs of the n-hexane extracts of the wild mint in the various regions against P. aeruginosa were similar (20 mg/mL). Moreover, the MIC and MBC of the n-hexane extracts of the wild mint in Meshginshahr against B. cereus were 5 and 10 μg/mL, respectively, whereas the corresponding values against B. cereus were similar (10 mg/mL). Furthermore, the results of the disk diffusion test interpretation revealed that the inhibition zone diameters (IZDs) of the n-hexane extract in the samples obtained from Meshginshahr against both bacterial species were larger than those of the samples taken from Namin.
Volume 20, Issue 1 (4-2020)
Abstract
Drop vortex is utilized to convey sewage across elevation change in steep catchments. This structure is generally used when the elevation difference is more than 5 m. Since the air and water flow are extensively combined in these structures and the sewage flow might contain detergent and foam producing materials, foam could produce in some parts of drop vortex. This phenomenon could affect vortex airflow and reduce drop vortex hydraulic performance. In this investigation, the effects of Foam Producing Flow (FPF) on vortex air discharge were studied by a scaled model and statistical Design of Experiment (DoE) methodology. Effects of Concentration Number, detergent type, and Froude Number on the dependent variable, air discharge to water discharge ratio, were studied by 33 full-factorial design and 63 runs. Analysis of the results revealed that all design factors had meaningful effects on vortex air discharge and it decreases by the increase of Concentration and Froude Number. Moreover, it was illuminated that foam formation could boost air discharge by 82% and in some conditions could reduce it more than 64%.
