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Showing 3 results for Tavoosi
Volume 3, Issue 4 (12-2014)
Abstract
Nasonovia ribisnigri (Mosely) is one of the most important pests of the lettuce plant and it was reported for the first time in Ahvaz in 2008. In order to investigate the dominant species of its natural enemies and their population fluctuations, sample were taken arbitrarily from fifty plants twice a week during the growing season in 2010-2012. In this study, ten species of predators, three species of parasitoids and two species of hyperparasitoids were collected and identified. Hoverflies with a relative frequency of 55% were the dominant predators. Peaks of lacewings and subsequently ladybird beetles were more coincident with peaks of aphid population in mid-March in the first year of studies. But their densities in the second year were very low. Also, hoverflies and parasitoids were mainly observed in the high densities in late March-early April, in both years. Regression analysis indicated that populations of aphids were mainly affected by ladybird beetles and lacewings in the first year of study, as well as by ladybird beetles, hoverflies and parasitoids in the second year. Therefore, additional studies are required for further evaluation on the potential abilities of these natural enemies being a good candidates for the future biological control programs.
Volume 20, Issue 2 (February 2020)
Abstract
The torque feedback of the vehicle's steering wheel or driver perception of the steering wheel is one of the aspects of steering quality that has been investigated extensively in recent decades. In this paper, the driver model for sensing torque feedback or haptic interaction between the vehicle equipped with a steer-by-wire system (SWB) and the driver has been designed. The driver model consists of a preview model and a neuromuscular model. The preview driver model calculates the desired angle of the steering wheel to follow the path, and the neuromuscular driver model that can perceive real-time torque feedback determines the real angle of the steering wheel according to muscular system transfer functions to follow its desired angle. Calculating of torques on the steering wheel requires estimation of the tire-road forces. Whereas directly calculating the tire-road forces is too difficult, particularly in the lateral vehicle dynamics, suitable estimator to estimate these forces designed. The simulation results using the Carsim and Simulink software indicate that the driver model performance improved 63 % when torque feedback is enabled. So the designed driver model with torque feedback has an important role in controlling and vehicle steering in conducting double lane-change maneuvers.
Mahta Sheikhi, Alireza Hejebri Nobari, Mahmoud Tavoosi, Reza Shabani Samghabadi,
Volume 24, Issue 4 (12-2017)
Abstract
The artifacts belonging to the Mannaean culture that are preserved in major museums worldwide display symbolic images indicating hidden values and meanings derived from their common beliefs and traditions. An analytical study of the reminiscence of the symbols used in these objects reveal the influence of religion and ritual traditions in Mannaean societies and their deep relations with the Neo-Assyrian culture. In this research, by examining and analyzing the most prominent symbolic images such as the sacred tree, winged gods, mythological creatures, Ishtar goddess on golden plaque, earthenware, ivory plaques and other objects found in Ziwiye, Hasanlu and Qalaichitepes as well as ivory objects with pictures of battle scenes, chariot riding and formal ceremonies found at Mannaean sites, we try to take a closer look at the impact of the Neo- Assyrian art on the Mannaean art and culture.
