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Feedback-controlled electromigration (FCE) has been employed to control metal nanowires with quantized conductance and to create nanogaps. The setting of the experimental parameters based on experiences is a common practice in FCE. However, tuning the optimization of parameters is intractable because trying all different combinations systematically is practically impossible. Therefore, we proposed...
Recently, the ability to analyze big data has been required for the optimization of social systems and the development of artificial intelligence. Consequently, the solution of combinatorial optimization problems has become important in recent years, especially for the suitable operation of infrastructures. However, combinatorial optimization problems have unique properties that the number of candidate...
Recently, the new computing architecture using Ising spin model has been attracting considerable attention. It is well known that the Ising spin model represents the physical properties of ferromagnetic materials in terms of statistical mechanics. In this model, the spin states are varied in order to minimize the system energy automatically, by the interaction between connected adjacent spins. The...
High performance permanent magnets are key components in the development of more efficient electrical motors for electric and hybrid cars as well as gearless wind turbines.
Tungsten is popular to use as a divertor tile in plasma equipment. However there are not enough information of tungsten at high temperatures. Recently, fiber-form nano-structured tungsten, which is called fuzz structure, was discovered. We modeled this fuzz structure to three types models, i.e., convex, concave and bubble models. We calculated the sputtering yield, the range, and the retention rate...
We have developed the pump and probe interferometer and reflective imaging technique of the metal surfaces during the femto-second laser ablation by using the plasma based soft x-ray laser at the wavelength of 13.9 nm. The pumping laser used for ablation was a Ti: Sapphire laser pulse with the duration of 80 fs pulse at a central wavelength of 795 nm, and had a gaussian spatial profile. By using the...
At the “Fujisan-Shizuoka Airport”, which is now under construction, two high geogrid-reinforced soil retaining walls were constructed to preserve natural environment consisting of steep swamp areas in front of the walls. These areas are to be buried in the backfill if gentle-sloped embankments were constructed. The height of the walls is 21.1 m and 16.7 m. As the walls support the east side of the...
Cache misses are problematic in real-time systems because they are unpredictable. Therefore, smaller codes that can fit in on-chip fast memories will help get rid of caches. However, reducing RISC applications code size is not an easy task because traditional RISC instruction sets have fixed length instructions compared to the higher density CISC instruction sets that use variable length instructions...
Let Q be the set of primitive words over a finite alphabet having at least two letters. We prove that Q has two rather strong context-free-like properties. The first one is that Q satisfies the nonempty, strong variant of Bader and Moura's iteration condition, and the second one is that intersecting Q with any member of a special, infinite family of regular languages, we get a context-free language...
A variety of crownophanes possessing both crown ether and cyclophane moieties are reviewed and their specific complexation are described. Aromatic nuclei including benzene, naphthalene, anthracene, pyridine, and other condensed polyaromatic rings are dealt with as components of crownophanes. Crownophanes containing nitrogen and sulfur atoms as ligating parts in the tethers of the aromatics are also...
Catalyst preparation procedures for Pt catalysts with high performance for polymer electrolyte fuel cells (PEFCs) were presented: electroless plating and direct hydrogen reduction methods. Model catalyst electrodes with different mesoscopic structures were studied using in situ infrared reflection absorption spectroscopy (IRAS) to determine structural properties of these electrodes and potential effect...
A MEMS nozzle device achieved low-temperature atmospheric pressure plasma irradiation for individual treatment of cells. The MEMS nozzle device had cell-trapping and releasing function, which enabled stable plasma treatment. Cells were trapped at the nozzle holes and the nozzle holes defined the area of plasma irradiation. Plasma treatment was performed against polyethylene bead (φ30 µm), lily pollen...
Electron-doped infinite-layer compound Sr1−xLaxCuO2(SLCO) is suitable for fundamental studies and device applications because of the simplest crystal structure and the highest Tc among electron-doped superconducting cuprates. The epitaxially grown c-axis oriented SLCO thin films with Tc of around 40 K were fabricated on the lattice matched substrates like DyScO3 and KTaO3[1]. Since the in-plane coherence...
Over the years, the concept of teaching engineering has changed from practical to more emphasis on theoretical studies. To reverse this trend, Final Year Project and Capstone Project courses were introduced in engineering programs in many Institutions of Higher Learning. Both Final year and Capstone projects are types of project work compulsory for final year engineering students to demonstrate their...
It is required to monitor fish species and amount in order to save marine resources. In the current study, broadband split-beam echo sounder was used to survey fish resources. The echo sounder was useful to track individual fish in schools because individual fish echoes in the schools could be separately measured and three dimensional positions of the echoes could be accurately estimated. It is well...
The by-catch of bigeye tuna (Thunnus obesus) has been serious problem for commercial fisheries of skip jack tuna (Katsuwonus pelamis) due to the strong constrain of quarter for each species. Selective catch of skip jack tuna with avoiding by-catch of bigeye tuna is required for sustainable and effective fisheries. Light stimuli were applied in attempts to remove unnecessary tuna species and let them...
We propose a high power λ-tunable burst-mode transmitter with an output of over +10 dBm using a synchronized gain-clamping booster SOA, and demonstrate a 40-dB loss budget and 40-km reach symmetric 40-Gbit/s λ-tunable WDM/TDM-PON.
We report a compact receiver optical sub-assembly (ROSA) for 100GbE CFP4 transceivers. All the four channels of fabricated module exhibits wide wavelength passband and high receiver sensitivity enough for 10-km-reach transmission.
Defects in Schottky barrier diodes (SBDs) formed on low-doped 4H-silicon carbide (SiC) have been studied by charge transient spectroscopy using single high energy alpha particles as the trap filling pulse. We have successfully detected defect levels in as-fabricated, electron-irradiated and thermally annealed SBDs where the high series resistance precludes the use of standard techniques such as deep...
An optical isolator based on Si-wire Mach-Zehnder interferometer is demonstrated using direct bonding of Ce:YIG on it. Large magneto-optic phase shift and optical isolation of 18 dB is obtained at a wavelength of 1322 nm.
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