Showing 6 results for Asemani
Volume 16, Issue 1 (3-2016)
Abstract
High blood glucose levels in the body named diabetes can increase damage in kidneys, eyes, heart and etc. In this investigation, a novel TS fuzzy static output feedback control structure is proposed to regulate the blood glucose level in the pre-defined desired values for type 1 diabetes using exogenous intra-venous insulin delivery rate. To this end, a nonlinear delay differential equation framework is considered to model the blood glucose/insulin endocrine metabolic regulatory system. The governing equations of the blood glucose/insulin model are approximated by a TS fuzzy model and then the proposed static output feedback controller is designed for this TS model.
Davood Akbari, Hamidreza Asemani, Naser Soltani,
Volume 17, Issue 9 (11-2017)
Abstract
Laser interferometry is one of the most applicable methods of calculating the surface displacement derivatives that can visualize very small displacement gradients, in µm/m level, on a relatively large area of a sample surface at once. This method can be beneficially used in industrial non-destructive tasting of materials, especially composites. However, getting an acceptable result of this inspection method, depends on the identification and properly adjusting the test parameters to a great extent. Shear size and loading amount, are the most important factors affecting crack detection ability in laser interferometry technique, which are both investigated in this paper. In this regard, several composite specimens with several cracks in different lengths have been prepared and tested with different parameters. Various tensile loading are applied to specify the allowable limit load in different shear sizes. Eventually, the effects of the crack inclination relative to the load direction are studied. The test results show that the best responses are observed with a shear size equal to the approximated defect sizes and a limited band of the loading range can be used to reveal the cracks.
H. Asemani , N. Soltani,
Volume 20, Issue 4 (April 2020)
Abstract
Shearography is a powerful optics method, which is capable of measuring derivatives of displacement, surface strains, and nondestructive testing. Time-average shearography and stroboscopic shearography have been developed for full-field vibration analysis. In this paper, the capability of time-average shearography and stroboscopic shearography for nondestructive testing has been compared using a proposed shearography configuration. In order to generate vibration, the proposed experimental system was equipped with a piezoelectric excitation mechanism. The time-average and stroboscopic shearography inspections were carried out by sweeping the excitation frequency of the piezoelectric. Stroboscopic shearography successfully detected the defect in the frequency ranges of 1300-1600, 6000-8000 Hz and 12600-13300 Hz, while time-average shearography detected the defect only in the frequency ranges of 6000-8000 Hz, and 12900-13100 Hz. The results of inspections of propylene specimen with a 10 mm circular hole indicated that stroboscopic shearography provides a more reliable assessment than time-average shearography. Compared to time-average shearography, stroboscopic shearography gives more clear fringes in the all frequency range. In addition, stroboscopic shearography could recognize the defect in wider frequency ranges.
A. Fallahi, M. Asemani,
Volume 20, Issue 8 (August 2020)
Abstract
The present study investigates the influence of three different microstructure features including volume fraction of α phase (A), thickness of α phase (B), and aspect ratio of primary α (C) on tensile properties of Ti-6Al-4V alloy, by response surface methodology with central composite design (CCD). The experimental data required for the design of experiment (DOE) and analysis of variance (ANOVA) is predicted using the artificial neural network (ANN). First using the experimental data of other researchers, the ANN with two hidden layers by the error propagation algorithm was trained. The main objective of this study is to compare the two feedforward and feedback neural networks in as well as examine the influence of microstructure on the mechanical properties of the Ti-6Al-4V alloy. The results showed that the feedback neural network has higher accuracy than the feedforward neural network to predict the values of yield strength and elongation. Besides, according to ANOVA and response surface method, C, B2, AB2, and A2C factors and A, C, B2, BC, and A2B factors have more significant effects on yield strength and elongation in Ti-6Al-4V alloy, respectively.
Seyedeh Samaneh Asemani, Gholamhossein Liaghat, H. Ahmadi, Yavar Anani, Amin Khodadadi,
Volume 20, Issue 12 (December 2020)
Abstract
In this study, the energy absorption capacity of kevlar/elastomer composites under high-speed impact loading has been investigated experimentally and numerically. The compliance of the mechanical behavior of elastomeric composites with the theory of hyperelasticity will complicate the analytical study. Therefore, numerical simulation due to the different and complex mechanisms of failure, has gained the largest share in the design of composite structures. In the present study, the most advanced method of modeling the finite element of composites Abaqus / Explicit has been used to determine their behavior during impact impact. For this purpose, planer shell elements were used to model the composite layers and to determine the behavior of the elastomeric composite failure model, the material model of the formable material and the material model of the vumat were used based on one of the damage criteria such as von mises stress. Due to the lack of criteria mentioned in the commercial versions of the software and the importance of considering such damages in numerical simulation for these composites, the criterion was written using coding in the Fortran software environment and the analysis of the penetration phenomenon in composite structure was added to the software capability. In order to validate this model, an experimental test was performed on the kevlar/elastomer composite by a Gas gun device. Also, the study of deformation and output velocity projectile and absorpted energy have been reported as results. The simulation results show a very good agreement with the experimental results.
Volume 27, Issue 1 (Spring 2023)
Abstract
According to the governing principles of medical law, the doctor's intervention in the patient's treatment requires the informed consent of the patient. This consent is achieved when the patient has expressed her/his consent by having sufficient information about the treatment process and its risks. In this study, the question related to the issue that what risks the doctor should inform the patient is answered by a descriptive-analytical method and a comparative approach in American and French law. Despite the different approaches, the two main criteria of "importance of risk" and "probability of risk" are the most fundamental influencing factors in determining the scope of the doctor's commitment in informing about the risks of treatment. In French law, based on the types of risk, "serious" and "common" risks are recognized as the subject of the doctor's obligation to inform, but in American law, based on the approach founded on the patient's perspective and with objective criterion, the doctor is obliged to inform about the risks that are typically important and basic from the patient's point of view, according to the "severity of the risk" and the "percentage of its occurrence". The new approach of English law is also an integrated approach based on "active interaction between doctor and patient" which, due to attention to the specific characteristics and conditions of the patient under treatment, brings maximum efficiency to realize informed consent. The same approach is also suggested in Iran law, which means that before treatment, the doctor, by examining the patient's condition, mood and views, in an active interaction, recognize important risks from the patient's point of view, and in cases where access to the patient's point of view, it was not possible to use the criterion of the reasonable patient.
