نتایج جستجو برای: hover fly
تعداد نتایج: 33797 فیلتر نتایج به سال:
This paper details the developments to date of an unmanned air vehicle (UAV) based on a standard size 60 model helicopter. The design goal is to have the helicopter achieve stable hover with the aid of an INS and stereo vision. The focus of this paper is on the development of an artificial neural network (ANN) that makes use of only the INS data to generate hover commands, which are used to dir...
Here we explain how flapping micro air vehicles (MAVs) can be designed at different scales, from bird to insect size. The common believe is that micro fixed wing airplanes and helicopters outperform MAVs at bird scale, but become inferior to flapping MAVs at the scale of insects as small as fruit flies. Here we present our experience with designing and building micro flapping air vehicles that ...
Background. The double haul is a unique feature of single-handed fly casting and is used in both fly fishing and fly casting competition. The movement behaviour during the double haul has not been investigated in previous research. Objectives. Describe the coordination of the rod and line hauling movements during distance fly casting. Methods. Elite fly casters performed distance castin...
چکیده خانواده سیرفیده معروف به مگس گل (flower fly یا hover fly) با حدود 6000 گونه توصیف شده، یکی از بزرگترین خانوادههای راسته دو بالان محسوب میگردد. مگسهای بالغ از شهد و گرده گلها تغذیه کرده و جزء گرده افشانهای مهم به شمار میروند. لارو تعداد زیادی از گونه های این خانواده شکارچی شته ها بوده و نقش مهمی در کنترل بیولوژیک آفات بازی میکنند. در مطالعه حاضر که طی سالهای 1390- 1389 انجام گرفت؛...
Late Holocene Environmental Reconstructions from Lake Solai, Kenya Michelle Goman, Gail M. Ashley, R. Bernhart Owen, Victoria C. Hover & Dev K. Maharjan To cite this article: Michelle Goman, Gail M. Ashley, R. Bernhart Owen, Victoria C. Hover & Dev K. Maharjan (2017): Late Holocene Environmental Reconstructions from Lake Solai, Kenya, The Professional Geographer, DOI: 10.1080/00330124.2016.1266...
Abstract. The design of a static parametric H∞ loop shaping controller using a linear matrix inequality (LMI) approach for a hover system is presented. The main steps to obtain such controller are explained. The parametric H∞ loop shaping technique explores more design flexibility by introducing a free parameter into the design process that ensures robust stabilization with regard to normalized...
Amphoterus Bezzi, 1915 is a genus of rarely collected Afrotropical hover flies (Diptera, Syrphidae). We present the first description female A. braunsi van Doesburg, 1956, redescribe males 1956 and cribratus 1915, describe new species, londti sp. nov. also provide colour photographs two DNA barcodes for key to identify species.
Introduction T HE propulsion system of a short takeoff and vertical landing aircraft, such as the F-35 Joint Strike Fighter, must operate over a wide range of conditions, provide good fuel efficiency at cruise, and deliver high thrust in augmented mode for transonic acceleration and supersonic operation. The propulsion system must be efficient for both high-speed flight and during hover, while ...
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