The antennas installed in mobile devices are small and low-profile compared to wavelength at the operating frequency. In general, horizontal elements short monopole have low radiation resistance. Low resistance requires matching circuit between 50 Ω feed line decreases efficiency. By using characteristic mode, excitation of ground plane improve has been investigated. This paper proposes structu...

PET (Polyethylene Terephthalate) material is widely used for several industries, especially the electronics industry. This study conducted a design and simulation manufacture of cases smartphones using plastic injection machines manufacturing process. On results, it found that filling process, temperature pressure have similarities, namely distribution starting from center point to end casing d...

Digital equipment such as computers, telecommunication systems and instruments use microprocessors that operate at high frequencies allowing them to carry out millions or even billions of operations per second. A disturbance in the electrical supply lasting just a few milliseconds can affect thousands or millions of basic operations. The result may be malfunctioning and loss of data with danger...

Screw compressor performance is usually predicted by thermodynamic and fluid flow calculations based on a dimensionless flow model. However factors, which affect the power consumption, delivery and reliability of these machines, such as dynamic flow losses, leakage and oil flow drag, are not estimated accurately by such procedures. By the use of 3-D numerical modelling of the compressor fluid f...