In-house developed (1– 100) and (11– 20) oriented 4H-SiC wafers, a reference wafer were used to evaluate the impact of SiC structural defects on degradation phenomenon bipolar pn diodes. Evaluation crystal quality degraded devices was performed by comparing results etch pit densities, electroluminescence, Berg-Barrett topography, HRXRD HRTEM analysis. Our data demonstrate that is strongly related starting material. DENSO (HQ) wafers are less susceptible forward current degradation, which we...

4H-SiC SBDs have been commercialized for power application devices. However, the maximum current of these is 20A. In this work, we designed a JBS (junction barrier Schottky) diode structure and fabrication processes to be optimized. The breakdown voltage were over 100 A 660 V at Ir = 1 mA/cm2, respectively. recovery characteristics are much superior those Si-FRD while it comparable commercially available SiC-SBD elevated temperatures up 125°C..

Ultrasonic wave-sensing technology has been applied for the health monitoring of composite structures, using normal fiber Bragg grating (FBG) sensors with a high-speed wavelength interrogation system arrayed waveguide (AWG) filters; however, researchers are required to average thousands repeated measurements distinguish significant signals. To resolve this bottleneck problem, study established signal-processing strategy that improves signal-to-noise ratio one-time measured signal ultrasonic...

The paper introduces an application method of ICA on automobiles’ vibration considering dynamical properties and examines the performance through a driving test using experimental car. Original is meaningful in separation mixed signals, proposed realizes consideration properties. By applying method, road irregularity information conducted. Vertical accelerations uprights, body frame, trunk are measured. Integral, differential calculated those signals also considered observed as well measured...

SEA is widely used for noise and vibration analysis in high frequency range, but the method not accurate enough low analysis. On other hand, EDA feasible all band. Application results of Statistical energy (SEA) Energy density (EDA) on complicated structure are demonstrated this paper. Their application feasibilities shown through experiments two points; comparing estimated measured energy, input powers by methods respectively. As a result, it that model effective estimating power range ,...

An application method of ICA on vibration an automobile considering dynamical properties is introduced and its performance examined through a numerical simulation using half car model. The proposed separates mixed signals properties, while original assumes static mixture. Also, methods for fixing order independent components amplitude are the estimation road irregularity. By applying method, irregularity with information estimated without knowing parameters such as mass spring constant.

Selected from various eigenmodes of blading, nodal diameter k= 0 and 1 are both related to shaft torsional and/or axial vibration bending vibrations respectively. In order avoid the possibility 2f (f=power system frequency) resonance, ISO regulates final calculation results considering combination between blade vibration. Previous study has reported a global method for blade-shaft coupled analysis governing in systematic manner, was completed. However, it is also known that coupling...

Recently, mechanical products have become more complicated and many suppliers participate to complete a product. In such situation, it is important predict the integrated performance of product with each components. However, prediction noise vibration difficult because characteristics component, as natural frequencies, change when component installed into main structure. Then authors proposed optimized design method for extra devices on product; utilizing transfer function synthesis device,...

The quietness of mechanical products is an important product value, and structural design considering noise vibration in the early stages has become even more important. Then this paper discusses feasibility structure layout method by using Analytical Statistical Energy Analysis (ASEA) for reduction. First, order to perform design, devise verify calculation method. This that remaining ILF subsystem loss factor matrix allow CLF 0. optimization procedure carried out find a lowvibration ASEA...

A fabrication process for nanometer silicon pillars by quasi-isotropic etching a buried-gate-type surrounding gate transistor (BG-SGT) is proposed. In normal SGT structure, the diameter of channel region defined using pillar whose equal to minimum feature size. However, in BG-SGT located within buried and hence smaller than By electron beam (EB) lithography with size 65 nm, we were able fabricate successfully an entire was about 40 nm. addition, dependence rate sidewall on crystallographic...

Development of sound and vibration analysis method for comprehensive mechanical structure has been highly demanded in recent years. However, it is difficult because characteristics each part influences other interactively, complicates the power flow. To solve problem, authors have developing expansion Statistical energy (SEA) solid structure, although conventional SEA developed beam shell structures. In this research, coupling loss factors, one parameter, proposed its validity shown through...

Broadband dynamic absorber is proposed by authors, which a beam, or plate added on to main structure and enable its vibration reduction. Vibration reduction in broadband frequency demonstrated previous study but detailed mechanism not explained yet. In this study, clarifying of targeted design an appropriate for arbitrary system. As example, uniform beam with simple shaped through numerical simulation. To clarify the difference common points conventional absorber, pseudo modal model,...