Shingo Takeda

Kyushu Institute of Technology

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<title>New design concept of multilayer supermirrors for hard x-ray optics</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1999)

Koujun Yamashita Hideyo Kunieda Yuzuru Tawara Keisuke Tamura Yasushi Ogasaka

It is important to enhance the reflectivity of multilayer supermirrors in 10-100 keV region used for hard x-ray optical systems. For this purpose design methods of multilayer supermirrors have been investigated at the grazing angle of 0.3 degrees by means of the x-ray etalon or phase matching configuration. It means that the 1st and higher order Bragg reflections emanated from different periodic lengths cooperatively enhance the reflectivity at energy bands concerned. The x-ray etalons method is useful for multi-band mirror with the band width of 5 keV or so, but becomes a bit difficult to make the energy band wider connecting gaps between isolated bands. Because heavy oscillation of reflectivity curve occurs due to adjacent destructive and constructive interference. The phase matching method is useful to get smooth reflectivity in the broad energy band and is possible to enhance the 2nd order Bragg reflection in higher energy region. We present the design of hard x-ray telescope sensitive in 25-40 keV region by means of multi-block supermirrors of Pt/C multilayers. The effective area was obtained to be more than 100 cm².

X-ray optics

Reflection

X-ray telescope

10.1117/12.363646

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Citations (16)

Rocking curve measurements of infrared LEDs using highly parallel X-ray microbeam

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2001)

Shingo Takeda K. Yokoyama M. Urakawa Takashi Ibuki Kengo Takai

Microbeam

Lattice constant

Divergence (linguistics)

Lattice (music)

10.1016/s0168-9002(01)00545-9

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Citations (2)

COMPARISON OF MICRO TREMOR BETWEEN KEKB AND SPring-8

Y. Nakayama Taku Ito Shingo Takeda Shota Yamashita

Stability of ground is preferable for accelerator beam operation. We have measured micro tremor of ground at the KEKB and SPring-8 site, where the ground has quite different characteristics each other. In this paper, some of analysis results are shown, and the characteristics of the ground motion at the KEKB site and those at the Spring-8 site are compared.

KEKB

Source

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Citations (3)

Nurse care activity recognition challenge

Paula Lago Sayeda Shamma Alia Shingo Takeda Tittaya Mairittha Nattaya Mairittha

Although activity recognition has been studied for a long time now, research and applications have focused on physical activity recognition. Even if many application domains require the recognition of more complex activities, research on such activities has attracted less attention. One reason for this gap is the lack of datasets to evaluate and compare different methods. To promote research in such scenarios, we organized the Open Lab Nursing Activity Recognition Challenge focusing on the recognition of complex activities related to the nursing domain. Nursing domain is one of the domains that can benefit enormously from activity recognition but has not been researched due to lack of datasets. The competition used the CARE-COM Nurse Care Activity Dataset, featuring 7 activities performed by 8 subjects in a controlled environment with accelerometer sensors, motion capture and indoor location sensor. In this paper, we summarize the results of the competition.

Activity Recognition

10.1145/3341162.3345577

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Citations (35)

Modified linear combination fitting for large-area two-dimensional chemical state mapping

Radiation Physics and Chemistry (2019)

Masao Tabuchi Ren Sakamoto Shingo Takeda Shunsuke Konishi Toshimasa Suzuki

Chemical state

Feature (linguistics)

XANES

10.1016/j.radphyschem.2019.04.007

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Citations (5)

Constant-pitch microprism-array optical device for beam condensers in hard x-ray synchrotron radiation beamlines

Journal of Applied Physics (2013)

Yasushi Kagoshima Hidekazu Takano Shingo Takeda

A constant-pitch microprism-array optical device has been developed. It is a modified version of the previously reported quasi-Fresnel lens [Kagoshima et al., Appl. Phys. Lett. 101, 163102 (2012)]. The modification eases the fabrication of the lens, although it degrades some of the focusing performance. It consists of twenty 50-μm-wide right-angle microprisms, whose slope angles gradually increase to 67.8° at the outer side. By inclining the array, the aspect ratio of the microprisms becomes large enough for X-ray use. The effective slope angle can be enlarged to 86.4° at an inclination angle of 80.5°. A 10-keV synchrotron beam with a size of 680 μm (V) × 660 μm (H) was two-dimensionally condensed to 130 μm (V) × 380 μm (H) with a photon flux density gain of ∼3. We also show that the microprism array is suitable for practical use below the critical radiation dose rate.

X-ray optics

10.1063/1.4809560

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Citations (0)

Formation of Amorphous Graded Structure in Bi<sub>3</sub>Pb<sub>7</sub> Intermetallic Compounds under Strong Gravitational Field

Defect and diffusion forum/Diffusion and defect data, solid state data. Part A, Defect and diffusion forum (2009)

Tsutomu Mashimo Yusuke Iguchi Rabaya Bagum Tomokazu Sano Shingo Takeda

A visible four-layers structure with anomalous nano-sturucture was formed from a homogeneous -phase Bi3Pb7 intermetallic compound under a strong gravitational field (1.02x106 G, 130°C, 100 hours). In the 4th layer (lowest-gravity region), pure Bi particles precipitate. In the 2nd 3rd layers, composition graded structures, where Pb content increased along the gravity direction, were formed. It was found that the very broad XRD peak appeared in the 2nd layer, which indicated that an amorphous structure was contained.

10.4028/www.scientific.net/ddf.289-292.357

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Citations (4)

Structural analysis of ELO-GaN grown on sapphire using the x-ray micro-beam of an 8-GeV storage ring

MRS Proceedings (2005)

Takao Miyajima Shingo Takeda H. Kurihara K. Watanabe M. Kato

Coalescence (physics)

10.1557/proc-0892-ff22-01

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Citations (0)

Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability

Solid State Ionics (2018)