Institution
Japan Aerospace Exploration Agency
Facility•Tokyo, Japan•
About: Japan Aerospace Exploration Agency is a facility organization based out in Tokyo, Japan. It is known for research contribution in the topics: Galaxy & Telescope. The organization has 4327 authors who have published 12054 publications receiving 208330 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the authors compare several techniques that have been used to speciate nonmethane organic compounds (NMOC) including OVOC were codeployed/intercompared in well-mixed smoke generated by 47 fires in the U.S. Department of Agriculture Forest Service Fire Sciences Combustion Facility.
Abstract: [1] Oxygenated volatile organic compounds (OVOC) can dominate atmospheric organic chemistry, but they are difficult to measure reliably at low levels in complex mixtures. Several techniques that have been used to speciate nonmethane organic compounds (NMOC) including OVOC were codeployed/intercompared in well-mixed smoke generated by 47 fires in the U.S. Department of Agriculture Forest Service Fire Sciences Combustion Facility. The agreement between proton transfer reaction mass spectrometry (PTR-MS) and open-path Fourier transform infrared spectroscopy (OP-FTIR) was excellent for methanol (PT/FT = 1.04 ± 0.118) and good on average for phenol (0.843 ± 0.845) and acetol (∼0.81). The sum of OP-FTIR mixing ratios for acetic acid and glycolaldehyde agreed (within experimental uncertainty) with the PTR-MS mixing ratios for protonated mass 61 (PT/FT = 1.17 ± 0.34), and the sum of OP-FTIR mixing ratios for furan and isoprene agreed with the PTR-MS mixing ratios for protonated mass 69 (PT/FT = 0.783 ± 0.465). The sum of OP-FTIR mixing ratios for acetone and methylvinylether accounted for most of the PTR-MS protonated mass 59 signal (PT/FT = 1.29 ± 0.81), suggesting that one of these compounds was underestimated by OP-FTIR or that it failed to detect other compounds that could contribute at mass 59. Canister grab sampling followed by gas chromatography (GC) with mass spectrometry (MS), flame ionization detection (FID), and electron capture detection (ECD) analysis by two different groups agreed well with OP-FTIR for ethylene, acetylene, and propylene. However, these propylene levels were below those observed by PTR-MS (PT/FT = 2.33 ± 0.89). Good average agreement between PTR-MS and GC was obtained for benzene and toluene. At mixing ratios above a few parts per billion the OP-FTIR had advantages for measuring sticky compounds (e.g., ammonia and formic acid) or compounds with low proton affinity (e.g., hydrogen cyanide and formaldehyde). Even at these levels, only the PTR-MS measured acetonitrile and acetaldehyde. Below a few ppbv only the PTR-MS measured a variety of OVOC, but the possibility of fragmentation, interference, and sampling losses must be considered.
190 citations
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TL;DR: Three schemes are developed that have Mach-proportional dissipation inside the numerical shock wave structure, in contrast to Mach independent dissipation provided by conventional AUSM fluxes, and their desired performances are demonstrated for a wide spectrum of Mach numbers.
190 citations
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University of California1, Cardiff University2, KEK3, University of Wisconsin-Madison4, International School for Advanced Studies5, Argonne National Laboratory6, Lawrence Berkeley National Laboratory7, Dalhousie University8, McGill University9, Imperial College London10, University of Paris11, University of Tokyo12, University of Colorado Boulder13, Princeton University14, Paris Diderot University15, Japan Aerospace Exploration Agency16, Goddard Space Flight Center17, University of Melbourne18, National Institutes of Natural Sciences, Japan19, Osaka University20
TL;DR: Polarbear-2 as discussed by the authors is a cosmic microwave background polarimetry experiment which aims to characterize the arc-minute angular scale B-mode signal from weak gravitational lensing and search for the degree angular scale b-mode signals from inflationary gravitational waves.
Abstract: We present an overview of the design and status of the Polarbear-2 and the Simons Array experiments. Polarbear-2 is a cosmic microwave background polarimetry experiment which aims to characterize the arc-minute angular scale B-mode signal from weak gravitational lensing and search for the degree angular scale B-mode signal from inflationary gravitational waves. The receiver has a 365 mm diameter focal plane cooled to 270 mK. The focal plane is filled with 7588 dichroic lenslet–antenna-coupled polarization sensitive transition edge sensor (TES) bolometric pixels that are sensitive to 95 and 150 GHz bands simultaneously. The TES bolometers are read-out by SQUIDs with 40 channel frequency domain multiplexing. Refractive optical elements are made with high-purity alumina to achieve high optical throughput. The receiver is designed to achieve noise equivalent temperature of 5.8 μ
μ
K CMB s √
CMBs
in each frequency band. Polarbear-2 will deploy in 2016 in the Atacama desert in Chile. The Simons Array is a project to further increase sensitivity by deploying three Polarbear-2 type receivers. The Simons Array will cover 95, 150, and 220 GHz frequency bands for foreground control. The Simons Array will be able to constrain tensor-to-scalar ratio and sum of neutrino masses to σ(r)=6×10 −3
σ(r)=6×10−3
at r=0.1
r=0.1
and ∑m ν (σ=1)
∑mν(σ=1)
to 40 meV.
189 citations
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13 Jun 2016-ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
TL;DR: The AW3D30 dataset as mentioned in this paper is based on the global digital surface model (DSM) dataset of the Advanced Land Observing Satellite (ALOS, nicknamed Daichi).
Abstract: . Topographical information is fundamental to many geo-spatial related information and applications on Earth. Remote sensing satellites have the advantage in such fields because they are capable of global observation and repeatedly. Several satellite-based digital elevation datasets were provided to examine global terrains with medium resolutions e.g. the Shuttle Radar Topography Mission (SRTM), the global digital elevation model by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER GDEM). A new global digital surface model (DSM) dataset using the archived data of the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) onboard the Advanced Land Observing Satellite (ALOS, nicknamed “Daichi”) has been completed on March 2016 by Japan Aerospace Exploration Agency (JAXA) collaborating with NTT DATA Corp. and Remote Sensing Technology Center, Japan. This project is called “ALOS World 3D” (AW3D), and its dataset consists of the global DSM dataset with 0.15 arcsec. pixel spacing (approx. 5 m mesh) and ortho-rectified PRISM image with 2.5 m resolution. JAXA is also processing the global DSM with 1 arcsec. spacing (approx. 30 m mesh) based on the AW3D DSM dataset, and partially releasing it free of charge, which calls “ALOS World 3D 30 m mesh” (AW3D30). The global AW3D30 dataset will be released on May 2016. This paper describes the processing status, a preliminary validation result of the AW3D30 DSM dataset, and its public release status. As a summary of the preliminary validation of AW3D30 DSM, 4.40 m (RMSE) of the height accuracy of the dataset was confirmed using 5,121 independent check points distributed in the world.
188 citations
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TL;DR: In this article, a spectral line on-the-fly (OTF) observing mode was developed for the Nobeyama Radio Observatory 45m and Atacama Submillimeter Telescope Experiment 10m telescopes.
Abstract: We have developed a spectral line On-The-Fly (OTF) observing mode for the Nobeyama Radio Observatory 45-m and the Atacama Submillimeter Telescope Experiment 10-m telescopes. Sets of digital autocorrelation spectrometers are available for OTF with heterodyne receivers mounted on the telescopes, including the focal-plane 5
$\times$
5 array receiver, BEARS, on the 45-m. During OTF observations, the antenna is continuously driven to cover the mapped region rapidly, resulting in a high observing efficiency and accuracy. Pointing of the antenna and readouts from the spectrometer are recorded as fast as 0.1s. In this paper we report on improvements made to the software and instruments, requirements and optimization of observing parameters, the data-reduction process, and verification of the system. It is confirmed that, using optimal parameters, the OTF is about twice as efficient as the conventional position-switch observing method.
188 citations
Authors
Showing all 4340 results
Name | H-index | Papers | Citations |
---|---|---|---|
Yasushi Fukazawa | 135 | 882 | 64424 |
Jun Kataoka | 121 | 603 | 54274 |
Tadayuki Takahashi | 112 | 932 | 57501 |
Takaaki Tanaka | 105 | 321 | 41804 |
Yasunobu Uchiyama | 105 | 373 | 39610 |
Satoshi Tanaka | 96 | 739 | 76264 |
Masashi Hazumi | 87 | 708 | 29603 |
K. Izumi | 84 | 229 | 53205 |
Carolus J. Schrijver | 81 | 297 | 29858 |
Satoru Takahashi | 79 | 589 | 28007 |
Chris Done | 79 | 457 | 23210 |
Yasuo Doi | 79 | 370 | 33445 |
Poshak Gandhi | 75 | 481 | 18419 |
Alan M. Title | 74 | 203 | 21923 |
Yoshihiro Ueda | 72 | 576 | 25787 |