Wyniki wyszukiwania dla: R. Fujimoto

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Resolve Instrument on X-ray Astronomy Recovery Mission (XARM)

Y. Ishisaki, Y. Ezoe, S. Yamada, Y. Ichinohe, więcej

Journal of Low Temperature Physics > 2018 > 193 > 5-6 > 991-995

The X-ray Astronomy Recovery Mission (XARM) is a recovery mission of ASTRO-H/Hitomi, which is expected to be launched in Japanese Fiscal Year of 2020 at the earliest. The Resolve instrument on XARM consists of an array of 6 × 6 silicon-thermistor microcalorimeters cooled down to 50 mK and a high-throughput X-ray mirror assembly with the focal length of 5.6 m. Hitomi was launched into orbit in February...

artykuł

Pseudodidymellaceae fam. nov.: Phylogenetic affiliations of mycopappus-like genera in Dothideomycetes

A. Hashimoto, M. Matsumura, K. Hirayama, R. Fujimoto, więcej

Studies in Mycology > 2017 > 87 > C > 187-206

The familial placement of four genera, Mycodidymella, Petrakia, Pseudodidymella, and Xenostigmina, was taxonomically revised based on morphological observations and phylogenetic analyses of nuclear rDNA SSU, LSU, tef1, and rpb2 sequences. ITS sequences were also provided as barcode markers. A total of 130 sequences were newly obtained from 28 isolates which are phylogenetically related to Melanommataceae...

rozdział

Dynamic Data Driven Application Simulation of Surface Transportation Systems

R. Fujimoto, R. Guensler, M. Hunter, H. -K. Kim, więcej

Lecture Notes in Computer Science > Computational Science – ICCS 2006 > Dynamic Data Driven Application Systems (DDDAS 2006) > 425-432

A project concerned with applying Dynamic Data Driven Application Simulations (DDDAS) to monitor and manage surface transportation systems is described. Building upon activities such as the Vehicle-Infrastructure Integration initiative, a hierarchical DDDAS architecture is presented that includes coupled in-vehicle, roadside, and traffic management center simulations. The overall architecture is described...

artykuł

Temperature Control and Noise Reduction in our Compact ADR System for TES Microcalorimeter Operation

U. Hishi, R. Fujimoto, K. Kamiya, M. Kotake, więcej

Journal of Low Temperature Physics > 2016 > 184 > 3-4 > 583-589

We have been developing a compact adiabatic demagnetization refrigerator, keeping ground application and future missions in mind. A salt pill fabricated in-house, a superconducting magnet with a passive magnetic shield around it, and a mechanical heat switch are mounted in a dedicated helium cryostat. The detector stage temperature is regulated by PID control of the magnet current, with a $$\mathrm{d}I/\mathrm{d}t$$...

artykuł

Temporal Gain Correction for X-ray Calorimeter Spectrometers

F. S. Porter, M. P. Chiao, M. E. Eckart, R. Fujimoto, więcej

Journal of Low Temperature Physics > 2016 > 184 > 1-2 > 498-504

Calorimetric X-ray detectors are very sensitive to their environment. The boundary conditions can have a profound effect on the gain including heat sink temperature, the local radiation temperature, bias, and the temperature of the readout electronics. Any variation in the boundary conditions can cause temporal variations in the gain of the detector and compromise both the energy scale and the resolving...

artykuł

He flow rate measurements on the engineering model for the Astro-H Soft X-ray Spectrometer dewar

I. Mitsuishi, Y. Ezoe, K. Ishikawa, T. Ohashi, więcej

Cryogenics > 2014 > 64 > Complete > 189-193

The sixth X-ray Japanese astronomy satellite, namely Astro-H, will be launched in 2015. The Soft X-ray Spectrometer onboard the Astro-H is a 6×6 X-ray microcalorimeter array and provides us with both a high energy resolution of <7eV at 0.5–10keV and a 3′×3′ modest imaging capability for the first time. To cool the detector down to the operation temperature of 50mK, five cryocoolers, a 30-L superfluid...

artykuł

Operation of an ADR using helium exchange gas as a substitute for a failed heat switch

P. Shirron, M. DiPirro, M. Kimball, G. Sneiderman, więcej

Cryogenics > 2014 > 64 > Complete > 207-212

The Soft X-ray Spectrometer (SXS) is one of four instruments on the Japanese Astro-H mission, which is currently planned for launch in late 2015. The SXS will perform imaging spectroscopy in the soft X-ray band (0.3–12keV) using a 6×6 pixel array of microcalorimeters cooled to 50mK. The detectors are cooled by a 3-stage adiabatic demagnetization refrigerator (ADR) that rejects heat to either a superfluid...

artykuł

Magnetic Shielding of an Adiabatic Demagnetization Refrigerator for TES Microcalorimeter Operation

U. Hishi, R. Fujimoto, T. Kunihisa, S. Takakura, więcej

Journal of Low Temperature Physics > 2014 > 176 > 5-6 > 1075-1081

We are developing a compact adiabatic demagnetization refrigerator (ADR) dedicated for TES X-ray microcalorimeter operation. Ferric ammonium alum (FAA) was grown in a stainless-steel container in our laboratory. This salt pill was mounted together with a superconducting magnet and a conventional mechanical heat-switch in a dedicated helium cryostat. Using this system, we achieved $${<}40$$...

rozdział

A 65nm CMOS, 1.5-mm Bluetooth transceiver with integrated antenna filter for Co-existence with a WCDMA transmitter

M. Ashida, H. Majima, Y. Yoshihara, M. Nozawa, więcej

2012 10th International Power & Energy Conference (IPEC) > 81 - 84

This paper presents a fully integrated Bluetooth transceiver in a 65 nm CMOS, which occupies 1.5 mm on the chip. It even integrates an antenna filter to reject blocker from the co-existing wireless system such as WCDMA and GSM. The frequency response of the antenna filter is controlled by an on-chip temperature monitor. The antenna filter achieves 30 dB rejection over the entire WCDMA band-I of 1920–1980...

artykuł

Interference of the surface plasmon polaritons with an Ag waveguide probed by dual-probe scanning near-field optical microscopy

R. Fujimoto, A. Kaneta, K. Okamoto, M. Funato, więcej

Applied Surface Science > 2012 > 258 > 19 > 7372-7376

The propagation of surface plasmon polaritons (SPPs) on Ag waveguides with two different widths is directly observed using dual-probe scanning near-field optical microscopy (DSNOM). We find that the waveguide structure strongly affects the propagation of locally excited SPPs. SPPs in a flat plane structure spread radially, whereas SPPs in a 3.4-μm wide waveguide structure form two-dimensional interference...

artykuł

Suzaku observations of charge exchange emission from solar system objects

Y. Ezoe, R. Fujimoto, N.Y. Yamasaki, K. Mitsuda, więcej

Astronomische Nachrichten > 333 > 4 > 319 - 323

Recent results of charge exchange emission from solar system objects observed with the Japanese Suzaku satellite are reviewed. Suzaku is of great importance to investigate diffuse X‐ray emission like the charge exchange from planetary exospheres and comets. The Suzaku studies of Earth's exosphere, Martian exosphere, Jupiter's aurorae, and comets are overviewed (© 2012 WILEY‐VCH Verlag GmbH & Co...

artykuł

The Digital Processing System for the Soft X-Ray Spectrometer Onboard ASTRO-H —The Design and the Performance—

H. Seta, M. S. Tashiro, Y. Ishisaki, M. Tsujimoto, więcej

IEEE Transactions on Nuclear Science > 2012 > 59 > 2 > 366 - 372

We report the design and the performance of the engineering model of the digital signal processing system called the Pulse Shape Processor (PSP) for the Soft X-ray Spectrometer (SXS) onboard the ASTRO-H satellite. The SXS employs an X-ray microcalorimeter system, in which X-ray photons are detected as a heat pulse due to photoelectric absorption. The pixelized HgTe absorbers are cooled down to 50...

artykuł

ORIGIN: metal creation and evolution from the cosmic dawn

Jan-Willem Herder, Luigi Piro, Takaya Ohashi, Chryssa Kouveliotou, więcej

Experimental Astronomy > 2012 > 34 > 2 > 519-549

ORIGIN is a proposal for the M3 mission call of ESA aimed at the study of metal creation from the epoch of cosmic dawn. Using high-spectral resolution in the soft X-ray band, ORIGIN will be able to identify the physical conditions of all abundant elements between C and Ni to red-shifts of z = 10, and beyond. The mission will answer questions such as: When were the first metals created? How does the...

artykuł

Development of Adiabatic Demagnetization Refrigerator for X-ray Microcalorimeter Operation

A. Hoshino, T. Yatsu, T. Kunihisa, N. Koi, więcej

Journal of Low Temperature Physics > 2012 > 167 > 3-4 > 554-560

We are developing of adiabatic demagnetization refrigerator for X-ray microcalorimeter operation. By improving thermal environment in the cryostat, it achieved the lowest temperature of 80 mK, temperature stability of 9 μK rms at 100 mK, and a hold time of 7 hours at 100 mK. The excess heat load to the saltpill decreased from 10 μW to 3 μW. Using this system, we demonstrated a measurement of R–T curve...

artykuł

PDB71 CHARACTERISTICS OF EARLY ADOPTERS OF EXPENSIVE MEDICATIONS

D.T. Juarez, J. Davis, R. Fujimoto, R.S. Chung

Value in Health > 2011 > 14 > 3 > A104

rozdział

A 2.6-mW 106-GHz transmission-line-based voltage-controlled oscillator integrated in a 65-nm CMOS process

U Yodprasit, M Motoyoshi, R Fujimoto, K Takano, więcej

2011 IEEE Radio and Wireless Symposium > 223 - 226

2011 IEEE Radio and Wireless Symposium (RWS 2010)

In this paper, we report a low-power voltage-controlled oscillator optimized for an operation around 100 GHz. The ultimate targets of this design are to maximize the oscillation frequency and minimize the power consumption of the oscillator. At the same time, the oscillator must provide a reasonable tuning range and an acceptable phase noise performance. To achieve these stringent requirements, the...

rozdział

Real-time data driven arterial simulation for performance measures estimation

D Henclewood, A Guin, R Guensler, M Hunter, więcej

Proceedings of the 2010 Winter Simulation Conference > 2057 - 2069

2010 Winter Simulation Conference (WSC 2010)

Transportation professionals are increasingly exploring multi-pronged solutions to alleviate traffic congestion. Real-time information systems for travelers and facility managers are one approach that has been the focus of many recent efforts. Real-time performance information can facilitate more efficient roadway usage and operations. Toward this end, a dynamic data driven simulation based system...

rozdział

A 120-GHz transmitter and receiver chipset with 9-Gbps data rate using 65-nm CMOS technology

R Fujimoto, M Motoyoshi, U Yodprasit, K Takano, więcej

2010 IEEE Asian Solid-State Circuits Conference > 1 - 4

2010 IEEE Asian Solid-State Circuits Conference (A-SSCC)

The design and measured results of a 120-GHz transmitter and receiver chipset are described in this paper. A simple amplitude shift keying (ASK) is adopted for this chipset. The proposed transmitter and receiver are fabricated using 65-nm CMOS technology. The current consumptions are 19.2 mA for the transmitter and 48.2 mA for the receiver. A 9-Gbps PRBS is successfully transferred from the transmitter...

rozdział

D-band 3.6-dB-insertion-loss ASK modulator with 19.5-dB isolation in 65-nm CMOS technology

U Yodprasit, R Fujimoto, M Motoyoshi, K Takano, więcej

2010 Asia-Pacific Microwave Conference > 1853 - 1856

2010 Asia Pacific Microwave Conference (APMC 2010)

A compact and low-insertion-loss amplitude-shifted keying (ASK) modulator suitable for operations in D-band (110 GHz - 170 GHz) has been designed and successfully integrated with a 65-nm CMOS technology. The structure of the modulator is a transmission-line type single-pole-single-throw (SPST) switch. To minimize the insertion loss, a single section of a transmission line is used with two shunt transistors...

rozdział

An online transportation system simulation testbed

B. Baker, E. Hagle, T. Harvey, K. Jones, więcej

Proceedings of the 2009 Winter Simulation Conference (WSC) > 1201 - 1212

2009 Winter Simulation Conference (WSC 2009)

A testbed for evaluation of online distributed simulations of transportation system infrastructures is described that includes a modest portion of an urban road network in the midtown region of Atlanta, Georgia. The testbed includes sensors, servers, wireless communications, and mobile transportation simulations configured to model the testbed region. The system architecture for this testbed is described...

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