This paper presents a method for detecting multiple delaminations in composite laminates using non-contact phased arrays. The phased arrays are implemented with a non-contact scanning laser Doppler vibrometer (SLDV). The array imaging algorithm is performed in the frequency domain where both the guided wave dispersion effect and direction dependent wave properties are considered. By using the n...

As an important part of phased array system, the research on antenna is very necessary. The achieves scanning beam adaptively by regulating phase difference between each element. In this paper, a dual K-band circularly polarized with high broadband, broadband beam, wide axial ratio bandwidth and radiation efficiency designed. We combine advantages slot aperture antenna, use multimode waveguide ...

we conducted this study to compare fecal calprotectin between exclusively breastfed and formula or mixed fed infants aged one month and six months. sixty term infants were enrolled from the labor ward of valiasr hospital between oct 2011 and july 2015 and their fecal calprotectin was checked by the elisa method and hycult biotech kits. the enrolled infants had a birth weight of 2500-4000 g and ...

Phased logic is proposed as a solution to the increasing problem of timing complexity in digital design. It is a delay–insensitive design methodology that seeks to restore the separation between logical and physical design by eliminating the need to distribute low–skew clock signals and carefully balance propagation delays. However, unlike other methodologies that avoid clocks, phased logic sup...

Ultrasonic phased arrays offer significant advantages over radiography for pipeline weld inspections: they have higher detection rates for critical planar defects (i.e. cracks and lack of fusion), better defined interpretation, vertical sizing capability for Engineering Critical Assessment, no safety hazards, no licensing issues, no chemical wastes, and no requirement to evacuate the area. Phas...

NARL has active array radar which has been designed, developed and tested at 1280 MHz. This system comprises of planar microstrip patch antenna array fed by solid-state transreceiver (TR) modules, two-dimensional (2D) passive beam forming network (BFN) and direct IF digital receiver (DRx). Errors are the common factors that affect the data. The common errors are Random errors and Systemic error...

Active antennas have been in use in communications satellites for decades. The antenna configurations include array-fed reflectors, multiple-beam lenses and direct radiating phased arrays. The active feedings of the antennas include single amplifier per radiating element and matrix power amplifiers shared between clusters of radiating elements. This paper reviews the combinations of antenna con...

100 WORD ABSTRACT An RF receive-only phased-array coil for high-resolution in vivo imaging of human skin was developed. Simulations of signal-to-noise ratio (SNR) for various coil geometries—single loops and 2 and 3-element phased-arrays—were performed with respect to the special noise characteristics of small coils. The 2element phased-array coil was implemented. SNR measurements in a phantom ...

The definition of the continuous chirality measure(CCM) is provided and its applications are summarized in this tutorial review, with special emphasis on the field of transition metal complexes. The CCM approach, developed in recent years, provides a quantitative parameter that evaluates the degree of chirality of a given molecule. Many quantitative structural correlations with chirality have b...