Determination of Wool Follicle Characteristics of Iranian Sheep Breeds

Ansari-Renani, H.R.,Moradi, S.,Baghershah, H.R.,Ebadi, Z.,Salehi, M.,Momen, S.M. Seyed,Ansari-Renani, M.Y. Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.8

In this study wool follicle characteristics of Iranian sheep breeds were investigated. A total of 242 male and female sheep of different age from 5 breeds were studied. Samples of skin were taken from the right midside to determine follicle characteristics. Overall averages for males and females were $3.7{\pm}0.1$ and $3.5{\pm}0.1$ for S/P ratio; $3.2{\pm}0.1$ and $3.6{\pm}0.1$ for primary follicle density; $12.1{\pm}0.7$ and $13.8{\pm}0.4$ for secondary follicle density; $15.3{\pm}0.7$ and $17.4{\pm}0.4$ for total primary plus secondary follicle density; $2.3{\pm}0.2$ and $3.5{\pm}0.3$ for percentage of inactive secondary follicles. Significant differences were found in some follicle characteristics between sheep breeds. Results of this study showed that sheep breeds raised in different parts of Iran characterized by a low S/P ratio and follicle density could be classed as carpet wool breeds.

Improving buckling response of the square steel tube by using steel foam

Moradi, Mohammadreza,Arwade, Sanjay R. Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.6

Steel tubes have an efficient shape with large second moment of inertia relative to their light weight. One of the main problems of these members is their low buckling resistance caused from having thin walls. In this study, steel foams with high strength over weight ratio is used to fill the steel tube to beneficially modify the response of steel tubes. The linear eigenvalue and plastic collapse FE analysis is done on steel foam filled tube under pure compression and three point bending simulation. It is shown that steel foam improves the maximum strength and the ability of energy absorption of the steel tubes significantly. Different configurations with different volume of steel foam and composite behavior is investigated. It is demonstrated that there are some optimum configurations with more efficient behavior. If composite action between steel foam and steel increases, the strength of the element will improve, in a way that, the failure mode change from local buckling to yielding.

Improving buckling response of the square steel tube by using steel foam

Mohammadreza Moradi,Sanjay R. Arwade 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.6

Steel tubes have an efficient shape with large second moment of inertia relative to their lightweight. One of the main problems of these members is their low buckling resistance caused from havingthin walls. In this study, steel foams with high strength over weight ratio is used to fill the steel tube tobeneficially modify the response of steel tubes. The linear eigenvalue and plastic collapse FE analysis isdone on steel foam filled tube under pure compression and three point bending simulation. It is shown thatsteel foam improves the maximum strength and the ability of energy absorption of the steel tubessignificantly. Different configurations with different volume of steel foam and composite behavior isinvestigated. It is demonstrated that there are some optimum configurations with more efficient behavior. Ifcomposite action between steel foam and steel increases, the strength of the element will improve, in a waythat, the failure mode change from local buckling to yielding.

Static analysis of FGM cylinders by a mesh-free method

M. Foroutan,R. Moradi-Dastjerdi,R. Sotoodeh-Bahreini 국제구조공학회 2012 Steel and Composite Structures, An International J Vol.12 No.1

In this paper static analysis of FGM cylinders subjected to internal and external pressure was carried out by a mesh-free method. In this analysis MLS shape functions are used for approximation of displacement field in the weak form of equilibrium equation and essential boundary conditions are imposed by transformation method. Mechanical properties of cylinders were assumed to be variable in the radial direction. Two types of cylinders were analyzed in this work. At first cylinders with infinite length were considered and results obtained for these cylinders were compared with analytical solutions and a very good agreement was seen between them. Then the proposed mesh-free method was used for analysis of cylinders with finite length and two different types of boundary conditions. Results obtained from these analyses were compared with results of finite element analyses and a very good agreement was seen between them.

Analytical solution of non-Fourier and Fourier bioheat transfer analysis during laser irradiation of skin tissue

H. Ahmadikia,A. Moradi,R. Fazlali,Basiri Parsa 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.6

The thermal wave and the Pennes bioheat transfer models are solved analytically by employing the Laplace transform method for small and large values of reflection power (albedo) during laser irradiation. Most of the previous studies have been based on the infinite heat diffusion velocity, but non-Fourier thermal behavior has been observed experimentally in biological tissue. At low initial albedo values, the temperature in the skin depth that directly results from conduction heat transfer process is caused by the lengthy thermal relaxation time in skin tissue. This condition generates a big difference between the thermal wave and Pennes results at the beginning of the heating process. This difference increases under short-time heating condition and high heat flux. However, with high initial albedo, the temperature distribution in the skin depth becomes negligible because of the skin absorption of laser beams. The non-Fourier effect should be considered during laser heating with low albedo, because errors in the predicted temperature values may occur.

Analysis of fatigue resistance of continuous and non-continuous welded rectangular frame intersections by finite element method

M. L. McCoy,R. Moradi,H. M. Lankarani 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.5

Agricultural and construction equipment are commonly implemented with rectangular tubing in their structural frame designs. A typical joining method to fabricate these frames is by welding and the use of ancillary structural plating at the connections. This aids two continuous members to pass through an intersection point of the frame with some degree of connectivity, but the connections are highly unbalanced as the tubing centroids exhibit asymmetry. Due to the practice of welded continuous member frame intersections in current agricultural equipment designs, a conviction may exist that welded continuous member frames are superior in structural strength over that of structural frame intersections implementing welded non-continuous members where the tubing centroids lie within two planes of symmetry, a connection design that would likely fabricating a more fatigue resistant structural frame. Three types of welded continuous tubing frame intersections currently observed in the designs of agricultural equipment were compared to two non-continuous frame intersection designs. Each design was subjected to the same loading condition and then examined for stress levels using the Finite Element Method to predict fatigue life. Results demonstrated that a lighter weight, non-continuous member frame intersection design was two magnitudes superior in fatigue resistance than some current implemented frame designs when using Stress-Life fatigue prediction methods and empirical fatigue strengths for fillet welds. Stress-Life predictions were also made using theoretical fatigue strength calculations for the fatigue strength at the welds for comparison to the empirical derived weld fatigue strength.

Adsorption of malachite green from aqueous solution by carboxylate group functionalized multi-walled carbon nanotubes: Determination of equilibrium and kinetics parameters

M. Rajabi,B. Mirza,K. Mahanpoor,M. Mirjalili,F. Najafi,O. Moradi,H. Sadegh,R. Shahryari-ghoshekandi,M. Asif,I. Tyagi,S. Agarwal,Vinod Kumar Gupta 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-

MWCNTs functionalized with the carboxylate group are used as efficient adsorbent for the rapid removaland fast adsorption of malachite green from the aqueous solutions. The optimized contact time and pHwere 10 min and 9, respectively. The effect of temperature revealed that the adsorption capacity ofmalachite green (MG) dye increased with increasing contact time, temperature and pH of the workingsolution. The adsorption equilibrium and kinetic data was well fitted and found to be in good agreementwith the Langmuir isotherm model and pseudo second order kinetic model respectively with highcorrelation coefficient.

A finite element approach in estimating driver fatality ratio of a fleet of LTVs striking a passenger car based on vehicle’s intrusion, acceleration and stiffness ratios in side-impact accidents

Y. Y. Tay,A. Papa,L. S. Koneru,R. Moradi,H. M. Lankarani 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.3

The driver fatality ratio (DFR) proposed by the National Highway Traffic Safety Administration (NHTSA) demonstrates the relativefatality risks of occupants in various vehicle-to-vehicle (VtV) crashes. The readily available DFR is based on statistical crash data; hence,estimating the DFR of occupants for newer fleet of vehicles can be quite difficult. Three systematic methods such as the intrusion, decelerationand stiffness ratios of two colliding vehicles in side-impact accidents are proposed to estimate the DFR. A fleet of light trucks andvans (LTVs) striking a sedan car is reconstructed using the non-linear explicit code, LS-DYNA. The simulation results have shown thatthe intrusion and acceleration ratios-based approaches are in good agreement with the statistical DFR, whereas the DFR estimated usingthe stiffness-ratio based approach yielded poor agreement. The intrusion and acceleration ratios-based approaches are then utilized toformulate a combined DFR estimation model. In the second part of the study, the proposed methodology is carried further to estimate theDFR of occupants for a fleet of LTVs impacting a newer passenger car. The proposed methodology can be a viable tool for estimatingthe DFR for newer road vehicles and to improve its crash compatibility with collision partners.