2014 This paper reviews the main results on the structure and the dynamics of the ordered smectic phases of T.B.B.A. The study of lattice dynamics by means of neutron coherent inelastic scattering bears out the X-ray measurements : the smectic Bc and Ec phases show a conventional three-dimensional order, however the molecules may perform motions with large amplitude, this makes the observation ...

OBJECTIVE Clinicians commonly recommend that power wheelchair users with spinal cord injury perform wheelchair tilt and recline maneuvers to redistribute seating loads away from the ischial tuberosities. However, ischial pressure reduction may be accompanied by coccygeal pressure increases. Although the coccyx is among the most common sites of pressure ulcers, few studies have reported coccygea...

SUMMARY Three experiments were conducted in this study to investigate the human ability to control pen pressure and pen tilt input, by coupling this control with cursor position, angle and scale. Comparisons between pen pressure input and pen tilt input have been made in the three experiments. Experimental results show that decreasing pressure input resulted in very poor performance and was not...

The effects of passive head-up tilt on systolic time intervals were assessed in 18 patients with mitral valve prolapse. In addition to causing prolongation of the pre-ejection period and shortening of left ventricular ejection time, this circulatory stress led to progressive shortening of the Q to click interval. In 1 patient, a systolic click became audible which had not been heard in the supi...

We present a novel two-dimensional fiber-optic inclinometer with high sensitivity by crisscrossing two etched chirped fiber Bragg gratings (CFBG) arrays. Each array is composed of two symmetrically-arranged CFBGs. By etching away most of the claddings of the CFBGs to expose the evanescent wave, the reflection spectra are highly sensitive to the surrounding index change. When we immerse only par...

Optimizing the output power of a photovoltaic panel improves the efficiency of a solar driven energy system. The maximum output power of a photovoltaic panel depends on atmospheric conditions, such as (direct solar radiation, air pollution and cloud movements), load profile and the tilt and orientation angles. This paper describes an experimental analysis of maximizing output power of a photovo...

We briefly review the history of observations magnetic fields on Sun, and describe early magnetograps for full disk measurements. Changes in instruments detectors, cohort observers, knowledge base etc may result non-uniformity long-term synoptic datasets. Still, such data are critical detecting understanding trends solar activity. demonstrate value historical using studies active region tilt (J...

Fourier transform infrared spectroscopy (ETIR) of a ferroelectric liquid-ciystalline material: 4-(3)-(S>methy1-2..(S) chloropentanoyloxy-4'-octyloxy-biphenyl has been investigated in the wavenumber range 450-4000 cm for various temperatures and as a function of direct bias voltage in its SmC* phase. Samples prepared in both homeotropic and homogeneous alignments have been studied. The order par...