We have investigated the role of the Notch and Wingless signaling pathways in the maintenance of wing margin identity through the study of cut, a homeobox-containing transcription factor and a late-arising margin-specific marker. By late third instar, a tripartite domain of gene expression can be identified about the dorsoventral compartment boundary, which marks the presumptive wing margin. A ...

We find that ectopic expression of Delta or Serrate in neurons within developing bristle organs is capable of non-autonomously inducing the transformation of the pre-trichogen cell into a tormogen cell in a wide variety of developmental contexts. The frequencies at which Delta can induce these transformations are dependent on the level of ectopic Delta expression and the levels of endogenous No...

Measurements of the roll-damping derivative (lp) of three wing planforms were made by the free-flight roll-balance technique over the Mach number range 0-7 to 1.4. The wings were all of RAE 102 section, 7" 5 per cent t/c and aspect ratio 2.83 but varied in sweep and taper ratio. The two wings of taper ratio 0.33 showed little loss of damping in the transonic region but the 50 deg delta wing suf...

The cells along the dorsoventral boundary of the Drosophila wing imaginal disc have distinctive properties and their specification requires Notch activity. Later in development, these cells will form the wing margin, where sensory organs and specialised trichomes appear in a characteristic pattern. We find that Notch is locally activated in these cells, as demonstrated by the restricted express...

In this paper, robust UDE-based linear control strategy is developed for a class of second-order nonlinear uncertain systems with disturbances. After revealing the control structure and performing stability analysis, the robust control strategy is used to suppress wing rock motion. The approach is based on the uncertainty and disturbance estimator,which calculates and robustly cancels system un...

The kiteplane that is considered in this paper has stable attitude dynamics and flies slowly owing to its large main wing, which is suitable for ground observation. The rudder locates behind the propeller and its aerodynamic response is effected by the air flow induced by the thrust. This coupling interference makes the control of the kiteplane difficult, especially when the thrust is largely d...