A5031818112- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Superconducting and THz Device Technology
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Geophysics and Gravity Measurements
- Atomic and Molecular Physics
- Adaptive optics and wavefront sensing
- Cold Atom Physics and Bose-Einstein Condensates
- Phosphorus compounds and reactions
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Photovoltaic Systems and Sustainability
- Particle accelerators and beam dynamics
- Asymmetric Synthesis and Catalysis
- Muon and positron interactions and applications
- CO2 Sequestration and Geologic Interactions
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- HVDC Systems and Fault Protection
- Ultrasound Imaging and Elastography
The University of Tokyo
2006-2025
The University of Texas at Dallas
2024
Gifu University
2010-2023
Okayama University of Science
2023
Aichi University of Education
2023
Kobe University
2015-2023
Nagoya University
2021-2023
Kurume University
2023
Sophia University
2021
International University of Japan
2021
Branched allylic esters and carboxylates are fundamental motifs prevalent in natural products drug molecules. The direct C-H oxygenation of internal alkenes represents one the most straightforward approaches, bypassing requirement for an leaving group as classical Tsuji-Trost reaction. However, current methods suffer from limited scope─often accompanied by selectivity issues─thus hampering further development. Herein we report a photocatalytic platform general solution to these problems,...
We present the requirements, design, and evaluation of cryogenic continuously rotating half-wave plate (CHWP) for Simons Observatory (SO). SO is a cosmic microwave background polarization experiment at Parque Astronómico de Atacama in northern Chile that covers wide range angular scales using both small (⌀0.42 m) large (⌀6 aperture telescopes. In particular, telescopes (SATs) focus on primordial B-mode polarization. To this end, SATs employ CHWP to modulate incident light 8 Hz, suppressing...
The Crab Nebula, also known as Tau A, is a polarized astronomical source at millimeter wavelengths. It has been used stable light for polarization angle calibration in millimeter-wave astronomy. However, it that its intensity and vary function of time variety Thus, interest to verify the stability polarization. If detected, variability may be better understand dynamics understanding validity A calibrator. One intriguing application such observation use search axionlike particles (ALPs)....
Abstract Over the last 20 years, technologies for manufacturing rare-earth barium copper oxide (REBCO)-coated conductors have undergone a steady development. Currently, properties of these are reasonably stable owing to intensive efforts manufacturers. However, high-field magnet applications, such as magnets used in nuclear magnetic resonance instruments, accelerators, and fusion reactors, further enhancements current-carrying capabilities and/or current densities under high field necessary....
Very light pseudoscalar fields, often referred to as axions, are compelling dark matter candidates and can potentially be detected through their coupling the electromagnetic field. Recently a novel detection technique using cosmic microwave background (CMB) was proposed, which relies on fact that axion field oscillates at frequency equal its mass in appropriate units, leading time-dependent birefringence. For oscillation periods this allows telescope via induced sinusoidal of CMB linear...
Abstract The Simons Observatory (SO) is a cosmic microwave background survey experiment that includes small-aperture telescopes (SATs) observing from an altitude of 5200 m in the Atacama Desert Chile. SO SATs will cover six spectral bands between 27 and 280 GHz to search for primordial B-modes sensitivity σ ( r ) = 0.002, with quantified systematic errors well below this value. Each SAT self-contained cryogenic telescope 35° field view, 42 cm diameter optical aperture, 40 K half-wave plate,...
We present a transfer function-based method to estimate angular power spectra from filtered maps for cosmic microwave background (CMB) surveys. This is especially relevant experiments targeting the faint primordial gravitational wave signatures in CMB polarisation at large scales, such as Simons Observatory (SO) small aperture telescopes. While timestreams can be mitigate contamination low-frequency noise, usual methods that calculate mode coupling individual multipoles challenging covering...
Abstract At millimeter wavelengths, the atmospheric emission is circularly polarized owing to Zeeman splitting of molecular oxygen by Earth's magnetic field. We report a measurement signal in 150 GHz band using 3 yr observational data with Polarbear project. Nonidealities continuously rotating half-wave plate (HWP) partially convert light linearly light. While detectors are sensitive linear polarization, this effect makes them circular polarization. Although was not intended use, we utilized...
The solvent-free Horner–Wadsworth–Emmons reaction of triethyl phosphonoacetate with a variety aldehydes was catalyzed by DBU in the presence K2CO3 to give E-α,β-unsaturated esters highly selectively (99 : 1 for most reactions). ketones gave trisubstituted olefins good high E-selectivity DBU-Cs2CO3.
The Simons Observatory (SO) experiment is a cosmic microwave background (CMB) located in the Atacama Desert, Chile. SO' s small aperture telescopes (SATs) consist of three designed for precise CMB polarimetry at large angular scales. Each SAT uses cryogenic rotating half-wave plate (HWP) as polarization modulator to mitigate atmospheric 1/f noise and other systematics. To realize efficient modulation over observation bands, we fabricated an achromatic HWP (AHWP) consisting sapphire plates...
We report an improved measurement of the degree-scale cosmic microwave background $B$-mode angular-power spectrum over 670 square-degree sky area at 150 GHz with POLARBEAR. In original analysis data, errors in angle continuously rotating half-wave plate, a polarization modulator, caused significant data loss. By introducing angle-correction algorithm, volume is increased by factor 1.8. new using larger set. find measured consistent $\Lambda$CDM model Galactic dust foregrounds. estimate...
This study reports a new-type of nuclear emulsion that improves the track-finding efficiency charged particle detection. The is applied to GRAINE project, balloon-borne experiment observes cosmic γ-rays through an γ-ray telescope. new film dramatically detection for γ-rays. gel and films second (GRAINE-2015) were fully self-produced by ourselves. New handling methods novel have also been developed. Over time, stored gradually become desensitized minimum ionizing particles, but original...
We are developing the GRAINE project, which consists of a 10 MeV–100GeV cosmic |$\gamma$|-ray observation with precise (0.08|$^\circ$| at 1–2GeV) and polarization-sensitive (50% or below minimum detectable polarization for Vela pulsar above 100 MeV) large-aperture-area (|$\sim$|10m|$^2$|) emulsion telescope, by repetitive long duration balloon flights. In 2015, we performed Japan–Australia JAXA collaborative experiment Alice Springs balloon-launching station. The telescope had 3780cm|$^2$|...
Although the advancement of technology provides numerous opportunities to boost economic growth and development, equal distribution may not be guaranteed. Thus, this study seeks further elaboration as whether ICT development has a role play in inequality Indonesia. Using municipal level data from 2018, both linear non-linear models estimated using OLS 2SLS. Major findings include: (i) availability basic infrastructure is strongly linked reduction inequality; (ii) actual use positively...
For cosmic microwave background (CMB) polarization observations, calibration of detector angles is essential. We have developed a fully remote controlled system with sparse wire grid that reflects linearly polarized light along the direction. The new feature remote-controlled for regular calibration, which has not been possible in calibrators past experiments. control can be achieved by two electric linear actuators load or unload into position centered on optical axis telescope between time...
We present the requirements, design and evaluation of cryogenic continuously rotating half-wave plate (CHWP) for Simons Observatory (SO). SO is a cosmic microwave background (CMB) polarization experiment at Parque Astron\'{o}mico Atacama in northern Chile that covers wide range angular scales using both small (0.42 m) large (6 aperture telescopes. In particular, telescopes (SATs) focus on primordial B-mode polarization. To this end, SATs employ CHWP to modulate incident light 8~Hz,...
Axis-to-center chirality transfer reactions were described.
We describe the precise gamma-ray observation project Gamma-Ray Astro-Imager with Nuclear Emulsion (GRAINE), which uses balloon-borne emulsion telescopes. The telescope realizes observations high angular resolution, polarization sensitivity, and large aperture area in 0.01–100 GeV energy region. report on data analysis of tracks first demonstration imaging via an by using flight from balloon experiment performed 2015 (GRAINE 2015). films were scanned latest read-out system for a total 41...
Precise neutrino--nucleus interaction measurements in the sub-multi GeV region are important to reduce systematic uncertainty future neutrino oscillation experiments. Furthermore, excess of ${\nu_e}$ interactions, as a possible interpretation existence sterile has been observed such an energy region. The nuclear emulsion technique can measure all final state particles with low threshold for variety targets (Fe, C, H${_2}$O, and so on). Its sub-$\mu$m position resolution allows cross-section...