The InAlAs/InGaAs metamorphic HEMT (mHEMT) two-stage Ka-band amplifier and DC-30 GHz distributed SPST switch were designed and fabricated using low-k benzocyclobutene (BCB) bridged technology. This fabrication technology takes the advantages of its low dielectric permittivity (2.7), low loss tangent (0.008), low curing temperature, low water up-take, and simple manufacturing process. The MMIC f...

We have developed a THz near-field microscope with an ultrahighly sensitive detector, CSIP (charge-sensitive infrared phototransistor). In our microscope, scattered photons by a tungsten probe are collected by an objective of a confocal THz microscope and are finally detected by the CSIP. To suppress the far-field background, the probe vertically modulated and the signal is demodulated the sign...

Ž . We have combined some of the major positive advantages of laser-induced forward transfer LIFT and matrix-assisted Ž . pulsed laser evaporation MAPLE , to produce a novel excimer laser driven direct writing technique which has demonstrated the deposition in air and at room temperature and with sub-10 mm resolution of active and passive prototype circuit elements Ž on planar and nonplanar sub...

As a main part of hydraulic cylinder, the piston rod is used in tough surrounding and corrosive condition; consequently a high quality protecting layer is essential. Currently EHC, electroplating hard chromium (hard chrome) is a widespread method for piston rod due to powerful performance and low cost. Unfortunately the plating process contains hexavalent chromium (Cr) which is toxic and carcin...

A typical structure of thermal spray coatings consisted molten particles, semi-molten oxides, pores, and cracks. These factors caused the porosity sprayed coatings, leading to a significant influence on coating properties, especially their wear-corrosion resistance. In this study, post-spray sealing treatment Cr3C2-NiCr/Al2O3-TiO2 plasma-sprayed was carried out, then, corrosion properties were ...

Malzemelerin yüzey özelliklerinin geliştirilmesi ve çevresel şartlara daha iyi uyum sağlayabilmesi amacıyla geçmişten günümüze birçok alanda tercih edilen Termal bariyer kaplamalar (TBCs) uzay havacılık sanayisinde yaygın olarak kullanılmaktadır. TBC’ler çalışma koşulları esnasında erozyon, sıcak korozyon, oksidasyon CaO-MgO-Al2O3-SiO2 (CMAS) gibi hasar mekanizmalarına maruz kalmaktadır. Tüm bu...

In an alloy subject to vacancy-mediated diffusion, differences in intrinsic diffusivities tend produce vacancy excess and deficit. These are accommodated by mechanisms such as dislocation climb pore formation. This is of concern high temperature alloy-coating systems used industrial applications, pores may develop at the interface between coating, which undesired. paper presents a multicomponen...

Abstract We present new insights into the electrochemical properties of three metal sulfides MCr 2 S 4 ( M = Cr, Ti, Fe) probed as anode materials in sodium-ion batteries for first time. The electrodes deliver decent reversible capacities and good long-term cycle stability, e.g., 470, 375, 524 mAh g −1 are obtained after 200 cycles applying 0.5 A Fe, respectively. reaction mechanisms investigat...