Ultra high frequency (UHF) partial discharge (PD) detection approaches take advantages of strong anti-interference ability, and have been considered as a promising technology for online monitoring PD signals. This paper presents a meander antenna with wide frequency band and small size for UHF PD detection in power transformers. The optimal geometric parameters of the meander antenna were obtai...

Numerous environmental problems are mitigated by natural resource depletion, with yearly global use of nearly 25 billion tonnes, including aggregates. Fast industrial growth has witnessed the ever-increasing exploitation sand from rivers for various construction resolves, which caused an over-exploitation rivers’ beds and disturbed eco-system. This problem is also related to amount waste produc...

We address the meander problem “enumerate all topologically inequivalent configurations of a closed nonselfintersecting plane curve intersecting a given line through a fixed number of points”. We show that meanders may be viewed as the configurations of a suitable fully-packed loop statistical model defined on a random surface. Using standard results relating critical singularities of a lattice...

A significant space reduction of a Planar Log-Periodic Dipole Array (LPDA) is achieved in this work. This reduction was performed by utilizing the first order iteration meander shape dipole in the design of a planar LPDA. The minimization procedure is illustrated in this work by presenting two designs for a Euclidean LPDA with linear dipoles and a meander LPDA operating over the entire S freque...

The embedded meander line in stepped-impedance resonator (SIR) is proposed to design narrow bandpass filter with a good stopband characteristics. The design differs from the general SIR configuration in that the microstrip lines are bent at the location of the maximum magnetic field density. As a result, the resonators have high external quality factors by themselves, since the factor is closel...

Meander lines are promising slow-wave structures (SWSs) for millimeter-wave traveling-wave tubes (TWTs) due to low-cost manufacture, low-voltage operation, and high interaction impedance. However, experimental results on meander rare in the literature. Phase velocity impedance most important parameters design characterization of TWT SWSs. Their determination is crucial validating simulations de...

Regulation structures such as submerged vane are needed to reduce and eliminate environmental damage due increased flooding in rivers. In particular, scours on the outer bank flow velocities cause river bed change deteriorate. this study, effect was investigated experimentally by using 3-array areas close bank. The experimental results were performed open channel setup. Computational Fluid Dyna...

Abstract The article outlines the possibilities for assessing geological conditions related to fording beds of large lowland rivers, based on low-ceiling ad hoc aerial photos, and current state art utilization remote-sensing methods in engineering studies. conducted research provided a confirmation that set sensors installed onboard an vehicle enables recording images, analysis which allows det...

Surface-micromachined comb-drive resonators suspended by meander springs are modelled and simulated. General analytic expressions for lateral spring constants and effective mass of meander springs are derived and verified by finiteelement simulations. The spring constant equations are accurate to within 1% over a wide range of geometries. Analytic, simulated, and measured resonant frequency val...