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We propose a new contrast-echo method using counter-crossed beams of two ultrasonic frequencies as an ultrasound diagnostic for cancer. We call this the Counter-Cross Beam Contrast-Echo (C-CBCE) method. Sum and difference frequency components derived from nonlinear vibration of the contrast agents (microbubbles) driven by dual-frequency ultrasound are used in the C-CBCE method. In this study, we used...
Probenazole (3-allyloxy-1,2-benzisothiazole-1,1-dioxide, PBZ) is a chemical inducer of resistance against plant pathogens and has long been practically used for protecting rice plants against a blast fungus, Magnaporthe grisea. We have been investigating the expression profiles of rice genes in response to PBZ using cDNA microarray technique. An array composed of 1265 rice expressed sequenced tag...
Acceleration of electrons using intense laser pulses that excite multi-gigavolt fields in plasmas will be described and the path forward to practical accelerators. Experiments with the
We developed improved methods of liquid-phase detection of biological targets using HTS SQUID and Brownian relaxation of magnetic markers. In a real sample, the aggregation and precipitation of free markers deteriorate their Brownian relaxation and cause so-called blank signals. In order to solve this problem, we developed two methods. First, we introduced a reaction field Bre during the binding reaction...
Offshore wind-power generation is expected as one of the effective solutions for air pollution and global warming problems. In Europe, a lot of over MW-class offshore wind-power plants are already operated [1], and it has just started in Japan too. In order to develop such a large-scale offshore wind-power plant, it requires a MW-class dc-dc converter to efficiently send the generated power by High-Voltage...
Variable inductors have a simple structure that consists of only magnetic core, primary dc and secondary ac windings, but can control effective inductance of the secondary ac winding by the primary dc current due to magnetic saturation effect. Therefore, the variable inductors can be applied as a reactive power compensator in electric power systems by combining with power capacitors [1].
As the next generation of sub-MeV/MeV gamma-ray explorer for astronomy, we have developed an electron-tracking Compton camera (ETCC) which consists of combination of a gaseous ray-tracing chamber as a Compton-scattering target and position sensitive scintillator arrays as a scattered gamma-ray absorber. Our detector has full ray-tracing capability for Compton scattering reconstruction, the capability...
We fabricated a transition-edge sensor (TES) microcalorimeter for spectroscopic measurements of L X-rays emitted by transuranium (TRU) elements. A Pu L X-ray energy spectrum was obtained by irradiation with L X-rays emitted by a 244Cm source to the TES microcalorimeter. The energy resolution was evaluated to be 64 eV at the full width at half maximum (FWHM) for L X-rays at 14.28 keV. The obtained...
Terahertz metamaterial technique enables a sophisticated electromagnetic excitation of materials. Here, we demonstrate resonant excitation of spin precession motion of canted antiferromagnet ErFeO3 using the magnetic near-field produced by split ring resonator (SRR). When the resonance frequency of spin precession was near the magnetic resonance mode of SRR, we observed substantial increase of precession...
We have developed ferroelectric capacitor fabrication technique and a new sensing amplifier circuit to realize low-voltage and high-density FRAM. Improvement of IrO, top electrode near the ferroelectric interface successively lowers operation voltage. And our developed “Dual Reference Sensing Amplifier” enables to commercialize highly-reliable FRAM with memory density of 4Mb or larger.
This paper investigates the electronic structures of sputter-deposition SiO2 films in low-resistance state and high-resistance state at room temperature and low temperature. The electronic structure of post-resistive transition is also characterized spectroscopically by means of the current fluctuation.
This paper demonstrates the electronic structures of SiO2 films in low-resistance state and high-resistance state. The electronic structure is also characterized spectroscopically by means of the current fluctuation.
We have developed ferroelectric capacitor fabrication technique and a new sensing amplifier circuit to realize low-voltage and high-density FRAM. Improvement of IrO, top electrode near the ferroelectric interface successively lowers operation voltage. And our developed “Dual Reference Sensing Amplifier” enables to commercialize highly-reliable FRAM with memory density of 4Mb or larger.
The Belle II experiment is an e+e− collider for the search physics in the decays of B mesons, and it will start the operation in near future. The trigger rate is expected as 30 kHz and the raw data rate will exceed 30 GB/s. It is unable to record the data on the storage system, thus the online reduction is indispensable. We have developed a three-level event building system using inexpensive box switches...
Multi-GeV electron acceleration of electrons using intense laser pulses that excite multi-gigavolt fields in plasmas will be discussed. Experimental results with the new BELLA PW-class lasers and supporting simulations will be presented as well as a path forward to apply this acceleration method towards practical machines.
Fabrication of p-n structure for any photovoltaic device is a crucial step. In this paper optimized growth of B-doped p-BaSi2 layer grown by molecular beam epitaxy on Si(111) were presented first. The acceptor level of the B-atoms was estimated to be approximately 23 meV. High hole concentrations exceeding 1×1020 cm−3 were achieved via dopant activation using RTA at 800 °C in Ar. By using this optimized...
For MeV gamma-ray Astronomy, we have developed an Electron Tracking Compton Camera (ETCC) as a next-generation MeV gamma-ray telescope. An ETCC consists of a three-dimensional electron tracker using a gaseous time projection chamber (TPC) and position-sensitive gamma-ray absorbers using pixel scintillator arrays (PSAs). We carried out the balloon borne experiment in 2006 with a small size ETCC and...
For MeV gamma ray astronomy, we have developed an Electron Tracking Compton Camera (ETCC) as a MeV gamma ray telescope in the next generation. Our detector consists of a gaseous Time Projection Chamber (TPC), which uses μ-PIC as the two-dimensional readout detector, and a position sensitive scintillation camera. We launched a small size ETCC with a 10 cm × 10 cm × 15 cm TPC loaded on a balloon in...
Based on pump-probe technique (PPT), we observed stimulated Brillouin scattering (SBS) in a 100-m-long silica graded-index multimode optical fiber with the same core diameter as that of a perfluorinated graded-index polymer optical fiber (PFGI-POF) (= 50 μιη). The SBS threshold was measured to be −50 mW, which was much lower than 5.08 W, the SBS threshold obtained for the same fiber without PPT. This...
We present a simple technique for obtaining a broad and flat Brillouin gain spectrum (BGS) in optical fibers. By modulating the driving current of a pump laser diode with triangular waveform, a BGS with lower than 0.3 dB gain variation over > 200 MHz is achieved, which is, to the best of our knowledge, the flattest BGS ever reported. With this technique, the bandwidth of the flattened BGS can be...
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