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In this paper, we demonstrate a high heat resistant bonding method by Cu/Sn transient liquid phase sintering (TLPS) method can be applied to die-attachment of silicon carbide (SiC)-MOSFET in high temperature operation power module. The die-attachment is made of nano-composite Cu/Sn TLPS paste. The die shear strength was 40 MPa for 3 × 3 mm2 SiC chip after 1,000 cycles of thermal cycle testing between...
The COMET experiment at J-PARC aims to search for the charged lepton flavor violating process of neutrinoless muon to electron conversion. The goal sensitivity is to be improved by a factor of 10000 to the current limit. In order to achieve the goal sensitivity, we have developed a straw tube tracker as an electron detector which has very high momentum resolution. To read out the signal from the tracker...
As an important section in the chain of semiconductor products manufacturing, dispensing techniques and relevant dispensers drawn increasing attentions of the researchers and engineers in recent years. In some applications, the dispenser cycles are required to be completed within 2 ms and the corresponding dot diameters are usually in micrometer scale, and sometimes even in nanometer scale when extremely...
Multi-mode feedback control is demonstrated in hexagonally coupled GaAs mechanical resonators using optically-induced photothermal stress. Positive feedback enables simultaneous amplification and self-oscillations of two coupled mechanical modes. An extension of this scheme to multiple mechanical modes would provide highly sensitive mechanical sensor arrays and integrated oscillator systems based...
The phonons in an electromechanical system are harnessed to mimic the fundamentals of the Ising model. Specifically spins are mimicked by mechanical parametric resonances and the coupling between them is created by generating two-mode squeezed states. These results suggest that an electromechanical system could be developed to imitate the Ising Hamiltonian for a large number of spins with multiple...
An electromechanical phonon waveguide (WG) consisting of a GaAs/AlGaAs heterostructure hosts broad phonon bands that allows piezoelectrically-excited phonon vibrations to be guided. Also, strong excitation of phonons in this device can induce elastic nonlinearities resulting in the frequency conversion of phonons via four wave mixing. Using this functionality we demonstrate frequency-division-multiplexed...
Semantic computing is an emerging research field that has drawn much attention from both academia and industry. It addresses the derivation and matching of semantics of computational "contents" where "contents" may be anything including text, multimedia, hardware, network, etc. which can be mapped to many areas in computer science that involve analyzing and processing the intension...
Thermal resistance evaluation of silicon carbide (SiC) power module for high-temperature operation has been performed in order to define the precise thermal resistance in real package structure. Transient thermal analysis method using SiC-Schottky barrier diode (SBD) is applied to measure the thermal structure function in wide temperature range from 50°C to 250°C. The module structure consists of...
The SX Series has an advanced architecture of large-scale shared memory, high-speed data transfer between the CPU and the memory, and an ultra high speed network interconnecting nodes. One of its key technologies in achieving high system efficiency is the fast data transmission between LSIs making up the system, which highly relies on the LSI and circuit technologies, as well as their inspection technologies...
In this paper we present a problem/solution system based on logic formula calculation scheme preserving the user's privacy. Semantic computing extends semantic Web both in breadth and depth. This article discusses the essences of semantic computing with a description of semantic services. The logic formula calculation schemes are an indispensable technique currently. However, suppose these schemes...
Natural fiber composites have already become commercially available in the fabrication of some industrial materials. The recent development of bamboo fiber reinforced composites represents a substantial addition to the growing number of these eco-composites. Of particular importance are bamboo fibers as reinforcing material for thermoset plastics. The method of preparation of bamboo fibers and their...
The development of quantum information enabled technologies has reached an interesting stage where we can now in principle engineer composite systems to exploit the best properties of these individual systems. Hybridization potentially allows us to undertake operations and tasks that may otherwise prove difficult. Such an example occurs where we couple a superconducting circuit to an electron spin...
The Space Solar Sheet of two configuration types using InGaP/GaAs/InGaAs triple junction solar cells has been developed. Two types of shielding material are utilized for the Space Solar Sheet. One type uses transparent resin films (Film type), and the other one uses cover-glass and back-sheet (Glass type). This solar sheet has possibility of the realization of the lightweight and high efficiency solar...
A data processing functions are expected as a key-issue of knowledge-intensive service functions in the Cloud computing environment. Cloud computing is a technology that evolved from technologies of the field of virtual machine and distributed computing. However, these unique technologies brings unique privacy and security problems concerns for customers and service providers due to involvement of...
The ultimate objective of the problem solving system is to provide an interrelated framework for prospective users to facilitate their work, such as biological and biomedical knowledge retrieval, discovery, capture. In addition to this objective, there is demand for secure and practical computing algorithms which address the challenge to safely outsource data processing onto remote computing resources...
This paper introduces the next (7th) generation 6.5kV chip set, IGBT and FWDi, for high voltage IGBT (HVIGBT) modules. New technologies for both the IGBT and FWD chips are adopted to increase the current rating while maintaining high robustness and package compatibility. These technologies achieve successful turn off of 4400A at 4.4 times rated nominal current (IC(nom)) confirming that the rating...
We will review our recent activities on GaAs/AlGaAs electromechanical parametric resonators. Piezoelectric transduction allows us to electrically modulate the resonance frequency, providing an on-chip testbed for nonlinear phononics experiments. Both degenerate and nondegenerate parametric amplification, as well as the excitation of parametric resonance, are performed for single and multi-mode resonators...
Graphene on SiC is studied using the first-principles calculation approach. Here, the roles of the [1–100] steps for the growth mechanism are focused on, and are discussed by comparing with the role of the [11–20] step. It has been found that the surface steps play important roles for the graphene growth. These studies provide us fundamental knowledge about the application of graphene on SiC.
Two recent approaches to dynamically convert the phonon frequency using the semiconductor-based electromechanical resonators are presented. One is coherent phonon manipulation in coupled mechanical resonators and the other is all-mechanical phonon lasing in a mechanical three-level system. The examples demonstrate the high functionality of semiconductor-based electromechanical resonators.
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