Speed and position control systems for marine vehicles have been subject to an increased focus with respect to performance and safety. An example is represented by drilling operations performed with semi submersible rigs where the control of position and heading requires high accuracy. Drifting from the well position could cause severe damage to equipment and environment. Also, the use of under...

background and aims. there is no consensus about the effect of tongue thrusting on incisor position. the purpose of this study was to evaluate the position of anterior teeth in growing children with tongue thrust swallowing. materials and methods. in the present study 193 subjects with an age range of 9 to 13 years participated. all the patients were examined by a trained investigator and those...

Malaria epidemiology is complex due to multiplicity of disease vectors, sibling species complex and variations in bionomical characteristics, vast varied terrain, various ecological determinants. There are six major mosquito vector taxa in India, viz. Anopheles culicifacies, An. fluviatilis, An. stephensi, An. minimus, An. dirus and An. sundaicus. Among these, An. culicifacies is widely distrib...

This paper presents an investigation into the design of a flight control system, using a robust backstepping control structure, designed using the two-time scale control procedure of the dynamic of a small-size autonomous helicopter in hover. The two-time scale controller takes advantage of the ‘decoupling’ of the translational and rotational dynamics of the rigid body, resulting in a two-level...

Locust can jump precisely to a target, yet they can also tumble during the trajectory. We propose two mechanisms that would allow the locust to control tumbling during the jump. The first is that prior to the jump, locusts adjust the pitch of their body to move the center of mass closer to the intended thrust vector. The second is that contraction of the dorsolongitudinal muscles during the jum...

Understanding the folding style of a fold-thrust belt is crucial to understand the nature and structural history of structures that may trap natural resources within the belt. In this research, the geometry and mechanism of a number of fault-related folds has been investigated based on field data and satellite image interpretations. The main study areas are: the Sohrevard and Ushtaniyan anticli...

Zusammenfassung Der Beitrag beschreibt eine exakte E/ALinearisierung für die translatorische Dynamik eines Quadrocopters. Die hierfür relevante Lageinformation reduziert sich auf die Ausrichtung des Schubvektors (bzw. der körperfesten zAchse), welche mit zwei Freiheitsgraden beschrieben werden kann. Hierzu wird im vorliegenden Beitrag ein spezielles Schubachsenquaternion eingeführt. Die E/A-Lin...

Thrust vector control (TVC) might be used to aircraft at large altitudes and in post-stall conditions when aerodynamic surfaces are ineffective. This study demonstrated that the implementation of TVC on high-speed is a reasonable solution an alternative compared complicated reaction system or surfaces. The numerical flight dynamics model X-15 experimental was developed implemented MATLAB/Simuli...

Smaller autonomous underwater vehicles that use differential thrust for surge and yaw motion control has the advantage of low cost and, at the same time, increased ma­ neuverability in yaw direction. However, since such vehicles are underactuated vehicles, design of an autonomous control system that enables the vehicle to autonomously track a predefined trajectory is challenging. In this paper,...