cylindrical thin-walled tubes due to construction and easy installation, high energy absorption capacity are used in the automotive industry as an impact energy absorber. however, the main weakness of cylindrical tubes is in the high initial peak load. therefore, in this paper, to overcome this weakness, a buckling initiator is used at the top of the tube. this buckling initiator is a steel rod...

The generation of electricity by solar photovoltaic batteries depends on the angle incidence sunlight and is maximum when this 90 degrees, i.e., rays fall strictly perpendicular. greater deviation from 90-degree angle, more radiant energy reflected rather than extinguished modules. Therefore, it especially important to correctly orient surface modules set desired inclination angle. To place pan...

Interactivity has become a major consideration in the development of a contemporary art practice that engages with the proliferation of computer based technologies.

nanotechnology has been shown to have promising roles in the development of various industries including the agricultural sector. the primary purpose of this study was to investigate the researchers’ attitude and the obstacle hampering the development of nanotechnology in the agricultural sector of iran. the population of this study consisted of researchers in national research centers/institut...

Obstacle avoidance operations of tractors can cause parts land to be unavailable for planting crops, which represents a reduction in utilization. However, utilization is significant the increase agricultural productivity. Traditional obstacle path planning methods mostly focus on automatic tractor navigation with small errors, ignoring decrease due operations. To address problem, this paper pro...

In order to solve the problem that it is difficult combine path planning with navigation rules in process of multi-ship collision avoidance wide waters, a step-by-step algorithm proposed this paper. Firstly, obstacle ship regarded as static obstacle, and carried out by using particle swarm optimization polar coordinate space combined field safety obtain turning point avoidance. Then, steering a...

In this paper a robust road departure avoidance system based on a closed-loop driver decision estimator (DDE) is presented. The main idea is that of incorporating the driver intent in the control of the vehicle. The driver decision estimator computes the vehicle look ahead lateral position based on the driver input and uses this position to establish the risk of road departure. To induce a risk...

In the current study, non-Newtonian flow pattern and heat transfer in an enclosure containing a tilted square are examined. In order to numerically simulate the problem, the mesoscopic lattice Boltzmann method is utilized. The non-Newtonian Carreau-Yasuda model is employed. It is able to adequately handle the shear-thinning case. The simulation results of flow and heat transfer have been ...

The User Account Management System (UAMS) is an extension of the original User DataBase (UDB) system presented at the USENIX Large Installation System Administration Conference in 1990. This paper describes the extensions of the UDB system from a single administrative entity tool for a distributed set of computers to a multidepartmental system over the period of three years since the first pape...