Experimental investigations of the magnetization, magnetostriction and magnetoelectric (ME) effects were performed on sandwich -type Metglas/PZT/Metglas laminate composites. The results have been analyzed by taking into account the demagnetization contribution. The study has pointed out that the magnetic flux concentration is strongly improved in piezomagnetic laminates with a narrower width leading to a significant enhancement of the ME effects. The piezomagnetic laminates with the optimal area dimension were integrated to form a 2-D geomagnetic device, which simultaneously can precisely detect the strength as well as inclination of the earth's magnetic field. In this case, a magnetic field resolution of better than 10 −4 Oe and an angle precision of ± 0.1 o were determined. This simple and low-cost geomagnetic-field device is promising for various applications.
This paper reports on the development of a novel simple three-dimensional geomagnetic device for sensing the spatial azimuth and pitch positions by using three one-dimensional magnetoelectric sensors assembled along three orthogonal axes. This sensing device combines piezoelectric transducer plates and elongated high-performance Ni-based Metglas ribbons. It allows the simultaneous detection of all three orthogonal components of the terrestrial magnetic field. Output signals from the device components are provided in form of sine and/or cosine functions of both the rotation azimuth and the pitch angles, from which the total intensity as well as the inclination angle of the Earth's magnetic field is determined in an overall field resolution of better than 10(-4) Oe and an angle precision of ±0.1°, respectively. This simple and low-cost geomagnetic-field device is promising for the automatic determination and control of the mobile transceiver antenna's orientation with respect to the position of the related geostationary satellite.
Lack of funds and difficult to access to formal loans from banks are problems faced by Vietnamese enterprises in general and Hanoi enterprises in particular. There have been many domestic and international studies on accessing to bank credit capital. While the research works focused on the analysis from a corporate perspective, no specific corporate disclosure has been made in Hanoi, in the context of the Covid pandemic. This study aims to identify the important factors affecting access to bank credit capital in Hanoi, through interviews with 200 customers, and to use a quantitative study method (linear regression). The results showed that there were five factors affecting access to bank credit capital in Hanoi: (1) Economic background, (2) Secured Assets (3) Business Plan, (4) Productivity and (5) the relationship between companies with banks.
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