Phased Array Antenna Calibration Based on Autocorrelation Algorithm.

The problem of calibrating phased array antennas in a noisy environment using an autocorrelation algorithm is investigated and a mathematical model of the autocorrelation calibration method is presented. The proposed calibration system is based on far-field scanning of the phased array antenna in an environment with internal noise and external interference. The proposed method is applied to a phased array antenna and compared with traditional rotating-element electric-field vector methods, which involve identifying the maximum and minimum vector-sum points (REVmax and REVmin, respectively).

Long-term outcomes of laparoscopic-assisted versus complete transanal endorectal pull-through technique for classic segment Hirschsprung's disease.

Background: The efficacy of transanal endorectal pull-through (TERPT) in treating classic Hirschsprung's disease may be enhanced by incorporating laparoscopic-assisted endorectal pull-through (LERPT). This study was done to compare the long-term outcomes of TERPT and LERPT in the treatment of classic segment Hirschsprung's disease.

Methods: Longitudinal study.

The impact of gadolinium-based contrast agents on H-magnetic resonance spectroscopy in normal brain area: a preliminary study.

Background: Giving contrast material before H-magnetic resonance spectroscopy (MRS) could enhance the precision of locating the lesion of interest. However, evidence indicates that contrast material might influence the outcomes of MRS.

Purpose: To verify the effect of gadolinium-based contrast agent (GBCA) on MRS in normal white matter.

Stability and magnetic properties of transition metal (V, Cr, Mn, and Fe) doped cobalt oxide clusters: a density functional theory investigation.

Co TMO ( = 6-8), (TM = V, Cr, Mn, and Fe) clusters are investigated using density functional theory calculations. The transition metal atoms preferentially replace one Co atom at sites where the number of metal-oxygen bonds is maximized, forming more stable structures. The evaporation of a Co atom is the most fragile dissociation channel for both pure and doped species.

Mandibular Implant-Supported Overdentures Using Telescopic Crowns and Immediate Loading Protocol: A 2-Year Prospective Follow-up Study.

Purpose: Implant-supported overdentures have been an effective treatment method for edentulous mandibles. However, the loading time after implant placement is still controversial. The purpose of this study was to evaluate the outcome of implant-supported overdentures using telescopic crowns for the treatment of edentulous patients with immediate loading protocol.