In this report, we present the development of a robust altitude control system for a quadrocopter. The controller has been developed on the basis of a reasonable simple mathematical model. Therefore it must not be sensitive to deviations of the real system from the plant model, which is taken into consideration for controller design. Furthermore, the control system shall be adaptable for differ...

habitat associations of wild sheep, alborz red sheep (ovis orientalis gemelini x ovis orientalis arkali ), in khojir and sorkheh hesar national parks were studied over three seasons (spring, autumn and winter) in 2000. the position of observed maternal groups (including ewe with lamb) and male groups (including rams, barren ewes and juveniles) were determined on topographical maps during the fi...

Botanisches Institut der Universität zu Köln, Gyrhofstraße 15, D-5000 Köln 41 Z. Naturforsch. 40c, 599—605 (1985); received May 6, 1985 Epicuticular Waxes, Alpine Plants, Ecophysiology, Relation to Altitude, Ultrastructure Epicuticular waxes were extracted and analysed from leaves of 7 different high alpine plant species, with 3 species harvested at different altitudes: Salix herbacea (1950 m, ...

Satellite constellations ooer interesting perspectives for Internet traac routing, since they beneet from a worldwide coverage and do not have the main drawback of geosynchronous satellites : propagation delay. However, because of their low altitude, LEO satellites are in constant motion and exhibit speciic issues for routing. This article presents a general architecture applicable to the integ...

Several researchers have employed the notion of reliability of coverage to extend the set covering and maximal coverage models. We discuss the suitability of these models in general for choosing ambulance station or vehicle locations. Then, we discuss one particular model (the queueing maximum availability location problem) in greater detail and describe difficulties encountered in applying it ...

The nutritional status of food plants and altitudes play pivotal role in successful rearing of Indian tropical tasar silk worm Antheraea mylitta Drury both in commercial and seed crops. The pupa is the most crucial stage of its life cycle for the adult life and race continuation as well as for exploiting its genetic potency and dynamics to our best advantages. In the present investigation an ex...

Several researchers have employed the notion of reliability of coverage to extend the set covering and maximal coverage models. We discuss the suitability of such reliability models in general for choosing ambulance station or vehicle locations. Then, we discuss one representative model from this class of models (the queueing maximum availability location problem) in greater detail and describe...

BACKGROUND Cardiac arrest is a condition in which the heart is completely stopped and is not pumping any blood. Although most cardiac arrest cases are reported from homes or hospitals, about 20% occur in public areas. Therefore, these areas need to be investigated in terms of cardiac arrest incidence so that places of high incidence can be identified and cardiac rehabilitation defibrillators in...

The hydropower station construction produced serious impacts on the regional eco-environment. The most obvious characteristics of the impacts caused by the cascade hydroelectric development are progressive, cumulative and regional. In this paper, the study area of Yellow river section from Longyangxia to Liujiaxia reservoir locates in the northwest Loess plateau of China. The remote sensing dat...