introduction: stress induces impairment of performance is a relatively common issue in pilots of military aviation. the present study aimed at gathering preliminary data on the relationship between stress and job satisfaction among military pilots, so determine to what extent military pilots suffering from job satisfaction. methods: this study was cross- sectional in design and used survey meth...

Abstract To meet the requirements of Tianwen-1 mission, adaptive entry guidance for vehicles, with low lift-to-drag ratios, limited control authority, and large initial state bias, was presented. Typically, law is divided into four distinct phases: trim angle-of-attack phase, range heading alignment trim-wing deployment phase. In predictor—corrector algorithm improved by planning an on-board tr...

The gimbal stabilization mechanism system is used to provide the stability to an object mounted on the gimbal by isolating it from the base angular motion and vibration. In this paper the model of one axis gimbal system with dynamics flying object is introduced. The gimbal torque relationships are obtained using Newton’s second law equation on the assumption that gimbal is rigid body. The syste...

Time-of-flight diffraction method (ToFD) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves. Although ToFD can measure through-wall length of defect accurately, this method is not capable of measuring horizontal defect size. In this paper, a new ToFD method for evaluating horizontal planar defects is presented. The finite...

Performance characteristic of an Unmanned Air Vehicle (UAV) is investigated using a newly developed heuristic approach. Almost all flight phases of any air vehicle can be categorized into trim and maneuvering flights. In this paper, a new envelope called trim-ability envelope, is introduced and sketched within the conventional flight envelope for a small UAV. Optimal maneuverability of the inte...

the cuckoo search algorithm is a recently developedmeta-heuristic optimization algorithm, which is suitable forsolving optimization problems. to enhance the accuracy andconvergence rate of this algorithm, an improved cuckoo searchalgorithm is proposed in this paper. normally, the parametersof the cuckoo search are kept constant. this may lead todecreasing the efficiency of the algorithm. to cop...

lobesia botrana (denis & schiffermüller) (lepidoptera: tortricidae), is an important vineyard-pest in the european and mediterranean areas and it was recently described in argentina and chile. since knowledge on the l. botrana phenology on argentina is still limited, the objective of this study was to develop a phenological model to predict voltinism of l. botrana in argentina through a reg...

As the demand for simulated flight training and interest in new technology increase, this study analyzed performance of simulator actual subjects to confirm efficient curriculum. Summarizing results study, found that had a significant positive effect on particular relatively large air maneuver, traffic pattern, cross country subjects. result analyzing theoretical major classes affect verify cor...