The design, alignment, calibration, and field deployment of a solid-state lightning detector is described. The primary sensing component of the detector is a potassium dihydrogen phosphate electro-optic crystal that is attached in series to a flat-plate aluminum antenna; the antenna is exposed to the ambient thundercloud electric field. A semiconductor laser diode (lambda = 685 nm), polarizing ...

anew and effective electrospinning method has been developed for producing aligned polymer nanofibers. the conventional electrospinning technique has been modified to fabricate nanofibers as uniaxially aligned array. the key to the success of this technique is the creation of a rotating jet by using a cylindrical collector in which the needle tip is located at its center. the unique advantage o...

every digital transmission system requires frame alignment. it is necessary to identify the varius signal componets and to bring receiver into phase with respect to the transmission format so that the digits can be properly assembled for demultiplexing. fast and reliable frame alignmant is important, and therefore has been a subject for study. this paper a comprehensive analysis of frame alignm...

An implicit unsteady upwind solver including a mesh motion approach was applied to simulate a helicopter including body, main rotor and tail rotor in hover flight. The discretization was based on a second order finite volume approach with fluxes given by the Roeand#39;s scheme. Discretization of Geometric Conservation Laws (GCL) was devised in such a way that the three-dimensional flows on arbi...

Control actuators' faults are among the major reasons to lose aircraft control while flights. The plane dynamics is severely dependent upon faults and errors in flight control systems and if the reformed control order is not issued by the fault tolerant controller there would be unpleasant outcomes such as inconsistency and the reduction of system performance and some dreadful aerial accide...

The optical dipole force from a singe focussed laser beam was used to study the role of laser-induced molecular alignment on the centre-of-mass motion of carbon disulphide molecules in a molecular beam. The translational, rotational and vibrational temperatures of the CS2 molecules were measured to be 3.4±0.2 K, 35±10 K and 250±14 K respectively. The velocity of the beam was measured to be 542±...

The Off-plane Grating Rocket Experiment (OGRE) is a soft x-ray grating spectrometer to be flown on suborbital rocket. payload designed obtain the highest-resolution spectrum of Capella date with resolution goal R ( λ / Δλ ) > 2000 at select wavelengths in its 10 55 Å bandpass interest. optical design realizes theoretical maximum ≈ 5000, but this performance does not consider finite individual c...

We present a novel way of wavefront sensing using commercially available, continuous-wave time-of-flight camera with QVGA-resolution. This CMOS phase is capable externally modulated light sources frequencies up to 100 MHz. The high-spatial-resolution the sensor, combined our integrated control electronics, allows image power modulation index as low -62 dBc/second/pixel. applicable problems wher...