Hiroshi Kikuchi
A5005687613- Liquid Crystal Research Advancements
- Astro and Planetary Science
- Planetary Science and Exploration
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Geology and Paleoclimatology Research
- Advanced Optical Imaging Technologies
- Magneto-Optical Properties and Applications
- Photonic Crystals and Applications
- Advanced Materials and Mechanics
- Magnetic properties of thin films
- Photorefractive and Nonlinear Optics
- Isotope Analysis in Ecology
- RNA Interference and Gene Delivery
- Electrowetting and Microfluidic Technologies
- Phase-change materials and chalcogenides
- Nuclear reactor physics and engineering
- Graphite, nuclear technology, radiation studies
- Nuclear Materials and Properties
- Dialysis and Renal Disease Management
- Cerebrovascular and Carotid Artery Diseases
- Intracranial Aneurysms: Treatment and Complications
- Advanced Fiber Laser Technologies
- Advanced biosensing and bioanalysis techniques
- Nuclear Physics and Applications
International University of Health and Welfare
2025
TEPCO (Japan)
1999-2024
Institute of Space and Astronautical Science
2020-2022
Hokkaido University Hospital
2020-2022
The University of Tokyo
2016-2021
Japan Aerospace Exploration Agency
2020-2021
Yamaha (United States)
2021
Chiba University
2021
Japan Broadcasting Corporation (Japan)
2005-2020
Hitachi (Japan)
1967-2020
The Hayabusa2 spacecraft arrived at the near-Earth carbonaceous asteroid 162173 Ryugu in 2018. We present observations of Ryugu's shape, mass, and geomorphology. has an oblate "spinning top" with a prominent circular equatorial ridge. Its bulk density, 1.19 ± 0.02 grams per cubic centimeter, indicates high-porosity (>50%) interior. Large surface boulders suggest rubble-pile structure. Surface slope analysis shows shape may have been produced from having once spun twice current rate. Coupled...
Hayabusa2 at the asteroid Ryugu Asteroids fall to Earth in form of meteorites, but these provide little information about their origins. The Japanese mission is designed collect samples directly from surface an and return them for laboratory analysis. Three papers this issue describe team's study near-Earth carbonaceous 162173 Ryugu, which spacecraft arrived June 2018 (see Perspective by Wurm). Watanabe et al. measured asteroid's mass, shape, density, showing that it a “rubble pile” loose...
To investigate the association between short sleep duration and elevated body mass index (BMI) obesity in a large sample of Japanese adults over period.Prospective design with baseline 2006 1-year follow-up.Workplaces an electric power company Japan.35,247 employees (31,477 men, 3,770 women) distributed throughout Japan.Measured weight height self-reported were obtained at annual health checkup 2007. Weight change was defined as difference 1 year later. Relative to reference category (sleep...
Abstract C-type asteroids 1 are considered to be primitive small Solar System bodies enriched in water and organics, providing clues the origin evolution of building blocks life. asteroid 162173 Ryugu has been characterized by remote sensing 2–7 on-asteroid measurements 8,9 with Hayabusa2 (ref. 10 ). However, ground truth provided laboratory analysis returned samples is invaluable determine fine properties other planetary bodies. We report preliminary results analyses on from particle size...
Collecting a sample of asteroid Ryugu The Hayabusa2 spacecraft recently traveled to the nearby carbonaceous collect samples and return them Earth for laboratory analysis. Morota et al. describe Hayabusa2's first collection, taken during brief touchdown on Ryugu's surface. Close-up images video sampling process allowed authors investigate surface colors morphology small scale. Relating these craters stratigraphy constrains evolution Ryugu. conclude that experienced prior period strong solar...
In 2018, the Japanese spacecraft Hayabusa2, arrived at small asteroid Ryugu. The surface of this C-type is covered with numerous boulders whose size and shape distributions are investigated in study. Using a few hundred Optical Navigation Camera (ONC) images pixel scale approximately 0.65 m, we focus on greater than 5 m diameter. Smaller also considered using five arbitrarily chosen ONC close-up scales ranging from 0.7 to 6 cm. Across entire area (~2.7 km2) Ryugu, nearly 4400 larger were...
We proposed a new flexible ferroelectric liquid crystal (FLC) device containing polymer walls and networks between plastic film substrates. The solution of FLC monomer sandwiched the substrates was irradiated with ultraviolet (UV) light through photomask to form walls. Polymer without optical anisotropy were formed from an isotropic-phase prevent leakage under crossed polarizers. Subsequently, uniform UV on remaining monomer, then all except wall areas. fabricated enabled grayscale display...
Treatment of the pyridinium salts heparin with N-methyltrimethylsilyl-trifluoroacetamide (MTSTFA) in pyridine for 2 h at various temperatures caused specific 6-O-desulfations from trisulfated disaccharide units to degrees without detectable depolymerization or other chemical changes. In order assess importance 6-O-sulfate groups N-sulfated glucosamine (GlcNS) residues promote FGF-1 and FGF-2 activities, 6-O-desulfated (6-O-DS-) heparins were quantitatively examined activity as enhancers...
The craters on the Martian moons, Phobos and Deimos, are in a state close to geometric saturation, indicating that they geologically old [1]. Secondary impacts from thought contribute an increased impact flux beyond expectations [2,3]. Previous crater counting also showed trailing hemisphere of has higher density than leading hemisphere, obscuring evidence synchronous orbit with Mars [4]. Additionally, significant size, identified as secondary catalog [5], exhibit distribution showing...
Optical phased arrays (OPAs), which manipulate an optical beam by controlling the phase of light, are devices characterized high speed, small size, light weight, and reliability that make various applications possible. In this study, eight-channel-waveguide OPA using electro-optic (EO) polymer for control was fabricated. Very high-speed scanning with a frequency 2 MHz demonstrated applying driving waveform superimposing sinusoidal rectangular-wave voltages. Furthermore, EO can be operated...
The poor selective cytotoxicity of anticancer drugs lead to dose-limiting adverse effects which compromise the clinical outcome. Solid tumors recruit new blood vessels support their growth, and epitopes that are uniquely expressed on tumor cells endothelial (ECs) can function as targets for immunoliposomal drugs. Membrane type 1 matrix metalloproteinase (MT1-MMP), an important protein related growth angiogenesis, is malignant activated ECs. Selective delivery could be achieved by targeting...