Quadrotor vehicles show great potential over a range of tasks, but effective control in windy environments continues to be a challenge. This paper develops a thrust-saturated controller on the Lie group SO(3) that uses flow sensing in order to reduce the effect of gusts on the vehicle. Designing the controller on SO(3) establishes almost-global exponential stability, and avoids the pitfalls of ...

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...

This paper describes some experimental work for modelling complex systems with RDF. Basic RDF represents information at a very fine level of granularity. The thrust of this work is to build higher-level constructs in RDF that allow complex systems to be modelled incrementally, without necessarily having full knowledge of the detailed ontological structure of the complete system description. The...

This paper investigates a slug-flow expander (SFE) for conversion of high-pressure gas/vapor into kinetic energy of liquid slugs. The energy transfer from high-pressure to kinetic energy is quantified using thrust plate measurements. Non-dimensional thrust data is used to quantify performance by normalizing measured thrust by thrust for the same water flow rate at zero air flow rate. A total of...

in order to study the qualitative, quantitative characteristics of a pure common populus alba stand in polkalleh & a mixed stand of populus alba & populus nigra in karchegan, two 30-year-old stands were selected with a plantation interval ( spacing) of 2.5 × 1.5 m in each of which 30 pcs of 2 are samples were randomly selected. in each sample pc all the trees diameters were measured using a dia...

In this paper a brushless permanent magnet motor is designed considering minimum thrust ripple and maximum thrust density (the ratio of the thrust to permanent magnet volumes). Particle Swarm Optimization (PSO) is used as optimization method. Finite element analysis (FEA) is carried out base on the optimized and conventional geometric dimensions of the motor. The results of the FEA deal to ...

g – standard gravitational acceleration, m/s μ gravitational constant, km/s mdry – spacecraft mass without fuel, kg mwet – spacecraft mass with total fuel, kg mhighF – high-thrust system fuel mass, kg mHSTF – hybrid system fuel mass, kg m02 – spacecraft mass after phase 1 of the transfer, kg ∆Vhigh – high-thrust only system ∆V, m/s ∆VH – high-thrust portion of hybrid system ∆V, m/s ∆VL – low-th...

The article entitled "Nation and Narrative: A Study of Nuruddin Farah's Maps" attempts a postcolonial reading the text trying to froground assertion national self. manner in which literature offers itself as powerful platform assert identity novel adroitly doing same would serve main thrust areas. Elaborate study on concept nation expounded by critics like Homi Bhaba , Benedict Anderson backgro...

Previous work has characterized electrohydrodynamic (EHD) thruster performance, determining that thrust-to-power ratios are comparable with that of conventional propulsion at the laboratory scale. Achievable thrust density of EHD propulsion has yet to be experimentally quantified and could be a limiting factor in its application. In this paper, we quantify the achievable thrust density for a wi...