Deterministic droplet coding via acoustofluidics

Encoding information into the serial sequence of micro-droplet lengths via acoustofluidic dispensing.

Flies land upside down on a ceiling using rapid visually mediated rotational maneuvers

Flies and other insects routinely land upside down on a ceiling. These inverted landing maneuvers are among the most remarkable aerobatic feats, yet the full range of these behaviors and their underlying sensorimotor processes remain largely unknown. Here, we report that successful inverted landing in flies involves a serial sequence of well-coordinated behavioral modules, consisting of an initial upward acceleration followed by rapid body rotation and leg extension, before terminating with a leg-assisted body swing pivoted around legs firmly attached to the ceiling. Statistical analyses suggest that rotational maneuvers are triggered when flies’ relative retinal expansion velocity reaches a threshold. Also, flies exhibit highly variable pitch and roll rates, which are strongly correlated to and likely mediated by multiple sensory cues. When flying with higher forward or lower upward velocities, flies decrease the pitch rate but increase the degree of leg-assisted swing, thereby leveraging the transfer of body linear momentum.

Existential Urgency: Contemporaneity, Biennials and Social Form

What happens to the form of the biennial when biennials become part of a world system of art institutions, subject to the historical temporality of a global contemporaneity? In particular, what happens when the periodic rhythms of national narratives of biennial exhibitions are overcoded by a serial sequence of international biennials – competing for contemporaneity – seemingly without end? This essay approaches these questions via a consideration of the debate about the transitional symbolic significance of the 1989 Third Havana Biennale. It contrasts three historical problematics of ‘the contemporary’ as models through which to think the cultural function of biennials: (i) the critique of anthropology, or, the coeval; (ii) socialist post- coloniality, or the avant-garde construction of traditions; (iii) the historical contemporaneity of a global capitalist modernity.

A New Coding Scheme for Data Security in RF based Wireless Communication

A radio-controlled (RC) aircraft is controlled remotely by a hand-held transmitter and a receiver within the craft. The working mechanism of such an arrangement designed using an AT89S51 microcontroller is reported in this chapter. The primary focus of the chapter is to describe the design of the interfacing of transceiver module with AT89S51 microcontroller and control the movement of the aircraft according to the instruction given remotely. The microcontroller reads the input given by the user and transmits the data to the receiver at the aircraft. The receiver module receives the transmitted signal and demodulates it and gives the data as serial sequence of bits at the output. The serial data are then given to the decoder which transforms the data from serial to parallel. This set of data is used to control motors and any related device. A special coding technique is used to secure the transmitted data.