the goal of present study was to compare the performance of adhd and normal children on planning tests. 45 children with adhd aged between 7 to 12 were selected in mashhad city through convenience and randomized sampling. we used snap، cbcl، trf, csi-4 and clinical interview for diagnosis of adhd and put them into adhd-i, adhd-h, adhd-c subtypes. each subtype comprised 15 children with adhd. th...

Wind affects adversely the cooling tower thermal performance. A field investigation was carried out to study the thermal performance of Heller cooling towers under wind conditions, involving measurement of wind velocity and its direction around the cooling tower, and obtaining water flow rates and temperatures at the cooling tower inlet and outlet. Results show that air suction at the tower top...

The busiest European and US airports are still a major bottleneck in the air transportation network. Optimizing utilization of existing airport capacity during periods of congestion, to maximize the airport throughput and minimize delays, is a challenging task. It is important for both strategic (several hours into the future) traffic flow management (TFM) and tactical air traffic control (ATC)...

The strategic goal of Shanghai Airport is to build a perfect domestic and international route network, and construct the air gateway connecting the world with China. Shanghai Airport is speeding up the construction of information systems, and business intelligence is core of the airport decision support system. First, this paper discusses the application blueprint of business intelligence for S...

In addition to the increasing passenger demand, airline frequency competition is another reason for the growing demand for airport resources. By providing more flight frequency, an airline attracts more passengers. As a result, demand for flight operations often exceeds capacity at congested airports, resulting in delays and disruptions. At some congested airports, the limited airport capacity ...

We derive a model for a wind turbine tower in the plane of the turbine blades, which comprises an Euler–Bernoulli beam coupled with a nacelle (rigid body) and a two-mass drive-train model (with gearbox). This model has two possible control inputs: the torque created by the electrical generator and the force created by an electrically driven mass located in the nacelle. First, we consider the ca...

This article presents a control approach that enables an autonomous operation of fleets of unmanned snow ploughs at large airports. The proposed method is suited for the special demands of tasks of the airport snow shovelling. The robots have to keep a compact formation of variable shapes during moving into the locations of their deployment and for the autonomous sweeping of runways surfaces. T...

Many complex maneuvers involving aircraft, vehicles and persons are carried out at airport aprons. Manual video surveillance used for safety and security purposes is inefficient and privacy protection must be guaranteed. In this paper, we propose a system named ASEV that automatically assesses situations for airport surveillance. It combines four main components: a low-level image processing un...

With appropriate vibration modeling and analysis the incipient failure of key components such as the tower, drive train and rotor of a large wind turbine can be detected. In this paper, the Nonlinear State Estimation Technique (NSET) has been applied to model turbine tower vibration to good effect, providing an understanding of the tower vibration dynamic characteristics and the main factors in...