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Journal Articles

Surface temperature dependence on AlN film formation processes induced by supersonic N$$_{2}$$ molecular beam

Teraoka, Yuden; Jinno, Muneaki*; Takaoka, Tsuyoshi*; Harries, J.; Okada, Ryuta; Iwai, Yutaro*; Yoshigoe, Akitaka; Komeda, Tadahiro*

Denki Gakkai Rombunshi, C, 134(4), p.524 - 525, 2014/04

Journal Articles

Influence of surface oxide layer on deuterium molecule desorption from V(001) surface

Teraoka, Yuden; Tode, Mayumi*; Harries, J.; Yoshigoe, Akitaka

Denki Gakkai Rombunshi, C, 134(4), p.473 - 478, 2014/04

Journal Articles

Experimental determination of effective attenuation length for SiO$$_2$$ thin film with synchrotron radiation phottoemission spectroscopy

Inoue, Keisuke; Teraoka, Yuden

Denki Gakkai Rombunshi, C, 130(10), p.1817 - 1818, 2010/10

The effective attenuation length (EAL) is a necessary parameter to estimate the thickness of SiO$$_2$$ overlayer by X-ray photoemission spectroscopy (XPS). Inelastic mean free path (IMFP) is often used instead of EAL because EAL is scarcely known. EAL values were determined experimentally in the photon energy region from 480 eV to 800 eV using synchrotron radiation photoemission spectroscopy. Although EALs estimated are different from calculated IMFPs, EALs, estimated without suboxides, are mostly close to theoretically-calculated IMFPs.

Journal Articles

Thermal degradation analysis of deuterium-ion-implanted V$$_{25}$$Cr$$_{40}$$Ti$$_{35}$$ using synchrotron radiation photoelectron spectroscopy

Tode, Mayumi; Harries, J.; Teraoka, Yuden; Yoshigoe, Akitaka

Denki Gakkai Rombunshi, C, 130(10), p.1819 - 1820, 2010/10

In order to study the thermal degradation process of the hydrogen storage materials surface layer and the thermal desorption of hydrogen property, we have used high-resolution synchrotron radiation X-ray photoelectron spectroscopy. The experiments were performed at the JAEA soft X-ray beamline BL23SU at SPring-8, using the "SUREAC2000" surface reaction analysis apparatus. Spectra were recorded for two samples (V$$_{25}$$Cr$$_{40}$$Ti$$_{35}$$) covered with native oxide layers, one of which was implanted with deuterium ions. For the un-implanted sample, the oxide layer changes dramatically between 373 K and 473 K, for the deuterium-implanted sample, the change occurs between 473 K and 573 K. The implantation of deuterium leads to a stabilization (of approximately 100 K) of the surface oxide layer.

Journal Articles

Observation of actin filaments in Leydig cells with a contact-type soft X-ray microscope with laser plasma X-ray source

Kado, Masataka; Ishino, Masahiko; Tamotsu, Satoshi*; Yasuda, Keiko*; Kishimoto, Maki; Nishikino, Masaharu; Kinjo, Yasuhito*; Shinohara, Kunio*

Denki Gakkai Rombunshi, C, 130(10), p.1774 - 1778, 2010/10

Actin filaments in Leydig cells from mouse testes have been observed with a contact-type soft X-ray microscope with laser plasma X-ray source. The Leydig cells were fixed with paraformaldehyde, stained with Phalloidin, and observed with a confocal laser microscope prior to the observation with X-ray microscope. Obtained images by both of the confocal laser microscopy and the X-ray microscopy were directly compared and revealed that not only position of actin filaments but also the shapes can be identified each other. The actin filaments in the X-ray images were clearly recognized and their structures were obtained in more detail compared to those in the confocal laser microscope images.

Journal Articles

Review on ultra-short and ultra-intense laser driven high energy proton and ion beams and their applications

Daido, Hiroyuki; Pirozhkov, A. S.; Nishiuchi, Mamiko

Denki Gakkai Rombunshi, C, 130(10), p.1706 - 1710, 2010/10

no abstracts in English

Journal Articles

Development of laser plasma X-ray microbeam irradiation system and radiation biological application

Sato, Katsutoshi; Nishikino, Masaharu; Numasaki, Hodaka*; Kawachi, Tetsuya; Teshima, Teruki*; Nishimura, Hiroaki*

Denki Gakkai Rombunshi, C, 130(10), p.1800 - 1805, 2010/10

no abstracts in English

Journal Articles

The Study of oxidation on TiAl surface with photoemission spectroscopy in conjunction with synchrotron radiation

Hashinokuchi, Michihiro*; Sumimoto, Yuichi*; Tode, Mayumi; Harries, J.; Okada, Michio*; Teraoka, Yuden; Kasai, Toshio*

Denki Gakkai Rombunshi, C, 130(10), p.1723 - 1729, 2010/10

The oxidation processes on a TiAl surface induced by a hyperthermal O$$_{2}$$ molecular beam (HOMB) with a translational energy of 2.2 eV was studied by X-ray photoemission spectroscopy in conjunction with synchrotron radiation. At a surface temperature of 300 K, the simultaneous growth of Al and Ti oxides accompanied with the segregation of Al$$_{2}$$O$$_{3}$$ near the surface was observed. The efficiency of oxidation for the HOMB incidence was smaller than that for O$$_{2}$$ backfilling (25 meV). Furthermore, the chemical compositions of oxide species (Al$$_{2}$$O$$_{3}$$, Ti$$_{2}$$O$$_{3}$$, TiO$$_{2}$$) on the TiAl surface were independent of the translational energy of incident O$$_{2}$$ molecule. The present results suggest that the oxidation on TiAl surface proceeds via precursor molecular states.

Journal Articles

Ultra thin AlN layer formation at Al(111) surface by supersonic N$$_{2}$$ beams

Teraoka, Yuden; Yoshigoe, Akitaka

Denki Gakkai Rombunshi, C, 129(2), p.294 - 295, 2009/02

The Al(111) surface has been directly nitrided by supersonic N$$_{2}$$ molecular beams at 473 K. A translational kinetic energy threshold of the nitridation was 1.8 eV. A nitrogen uptake curve obtained at the translational energy of 2.0 eV showed a linear profile with the nitrogen dose indicating non-protective layer formation. Al-2p photoemission spectra were involved a merely-shifted shoulder structure in the higher binding energy side so that sub-nitride components were included in the AlN overlayer.

Journal Articles

Photoemission study on natural oxidation of Cu$$_{3}$$Au with synchrotron radiation

Sowa, Makoto*; Yamazaki, Daichi*; Okada, Michio*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Toshio*

Denki Gakkai Rombunshi, C, 129(2), p.229 - 232, 2009/02

Native oxide at Cu$$_{3}$$Au(110) surface has been studied by high energy-resolution X-ray photoemission spectroscopy with synchrotron radiation. The clean surface of Cu$$_{3}$$Au(110) is terminated by Au and Cu atoms with equal contents. After oxidation in the air, Cu atoms segregated on the surface and the Cu-oxide was formed. In other words, Au atoms moved into the bulk. Au atoms below the oxide prevented the O atom diffusion into the bulk. Surface index dependences of natural oxidation suggested in every cases that the diffusion of Cu atoms contributed to the oxide formation.

Journal Articles

High-brightness electron sources for a next generation light source by an energy recovery linac

Iijima, Hokuto; Nagai, Ryoji; Nishimori, Nobuyuki; Hajima, Ryoichi

Denki Gakkai Rombunshi, C, 129(2), p.253 - 258, 2009/02

A high-brightness electron source of ultra-small emittance and high-average current is one of the most important components for next-generation light sources based on an energy-recovery linac (ERL). Such a high-brightness electron source can be realized by a DC photo-cathode gun driven by laser pulses tailored in temporal and spatial dimensions. We propose a novel photocathode based on a quantum cascade laser (QCL). Since ultrafast response of photo-electron emission from the QCL is compatible with tailored laser pulses, it is a candidate for the electron source for ERLs.

Journal Articles

Surface nano-processes induced by high-speed atomic and molecular beams

Teraoka, Yuden

Denki Gakkai Rombunshi, C, 127(2), p.118 - 125, 2007/02

Surface temperature and gas pressure are reaction controlling parameters of surface reactions. For instance, the following three reaction modes are selectable in the Si oxidation, "oxide film formation" in low temperature/high pressure conditions, "etching (SiO desorption)" in high temperature/low pressure conditions, and their coexistence depending on reaction conditions. Recently, it has been found that the oxidation reactions were also controllable by translational kinetic energy of O$$_{2}$$ molecules. Although irradiation of high speed particles such as ion beams induces roughening of surface crystal structure and the beams reach into deep bulk, atomic and molecular beams with low incident energy restrict the reactions to be adsorption at the extreme surface. If the incident energy is larger than a potential energy barrier, a direct adsorption process may take place without trapping at physically-adsorbed states. Generally the barrier height is several eV so that surface-excited processes are available even by atomic and molecular beams with hyper-thermal incident energy. The atomic and molecular beams are very useful techniques for precise control of film formation and etching with sub-nano-meter scale. Furthermore, a research field of surface stereo-reaction dynamics may open by applying oriented-molecular-beam techniques. The molecular orientation may be effective 4th reaction controlling parameter in addition to surface temperature, gas pressure, and the 3rd parameter of incident energy. Atomic and molecular beam generation techniques, some practical applications of surface-excited reactions with low energy beams, and perspective of the surface-excited nano processes will be introduced in this review.

Journal Articles

Mechanisms of concurrent SiO desorption with oxide layer formation at Si(001) surface

Teraoka, Yuden; Yoshigoe, Akitaka; Moritani, Kosuke*

Denki Gakkai Rombunshi, C, 127(2), p.133 - 139, 2007/02

Oxidation reactions at Si(001) surfaces has been studied via real-time in-situ photoemission spectroscopy for chemical bonding states of Si and O atoms, and mass spectrometry for desorbing SiO molecules with synchrotron radiation and supersonic O$$_{2}$$ molecular beams in the temperature range from 900K to 1300K. With increasing an incident energy in the temperature range from 900K to 1000K, the SiO desorption yield decreased. In that case, the time evolution of an Si 2p photoemission spectrum showed that SiO$$_{2}$$ structure at the surface was easily formed by the action of larger incident energy and the increased SiO$$_{2}$$ coverage correlated with the decreased SiO desorption yield. Coincidence measurements of Si 2p photoemission spectra and SiO desorption yield revealed that the decrease of SiO correlated with the increase of Si$$^{2+}$$ component, and the SiO desorption was terminated at the oxide thickness of 0.22nm. These facts indicate that the SiO desorption take place at the topmost Si dimmers and its precursor is so called T site, in which O atoms are bonding to the dangling bonds of the dimmers. Consequently, M1 and M2 in the Dual-Oxide-Species (DOS) model were clarified to be T sites and Si$$^{2+}$$ states, respectively.

Journal Articles

Translational kinetic energy induced oxidation on Ti(0001) surfaces using a supersonic O$$_{2}$$ beam

Ogawa, Shuichi*; Takakuwa, Yuji*; Ishizuka, Shinji*; Yoshigoe, Akitaka; Teraoka, Yuden; Moritani, Kosuke*; Mizuno, Yoshiyuki*

Denki Gakkai Rombunshi, C, 127(2), p.140 - 145, 2007/02

The initial sticking probability of O$$_{2}$$ molecule on a Ti(0001)-1$$times$$1 surface at room temperature was measured as a function of translational kinetic energy by real-time photoelectron spectroscopy. The O 1s photoelectron spectra can be fitted well with three components A, B, and C, where the chemical shift of component B and C are +0.7 and +1.6 eV relative to the binding energy of component A (528.8 eV). Upon exposing to the O$$_{2}$$ beam, component A and C appear dominantly and component B grows with an incubation time, indicating that two kinds of chemical adsorption states are concerned with dissociative adsorption of O$$_{2}$$ molecule at the initial stage. The incident energy dependence of initial sticking probability shows quite different behaviours between component A and C: initial sticking probability of component C decreases monotonously with incident energy and is almost constant above 0.6 eV, while initial sticking probability of component A shows a rapid decrease followed by a gradual increase with a minimum at 0.5 eV and then decreases with two small maxima at 0.9 and 1.8 eV. The observed incident energy dependence of initial sticking probability for component A and C are discussed in terms of a trapping-mediated dissociative adsorption and a direct dissociative adsorption process.

Journal Articles

Parallel volume rendering on immersive projection technology

Nakajima, Norihiro; Ono, Nobuaki*; Suzuki, Yoshio*; Kureta, Masatoshi*

Denki Gakkai Rombunshi, C, 124(10), p.2197 - 2198, 2004/10

Our research interest is to implement volume rendering on CAVE system at enough frame rate. It can be implemented on CAVE easily using texture mapping but there are some defects; for example frame rate declines when the view point is close to the data and images projected to the screens become big. Thus we try to find another way to implement it on CAVE. Considering that Onyx300 is a parallel computer and there are some algorisms of volume rendering which improve the frame rate, we make the program that draws stereo images through two of the algorisms and by parallel computing, and displays only two images on CAVE. And we confirm that this program works well and draws stereo images at sufficient frame rates.

Journal Articles

Design method of discrete-time 2DOF controller based on output response sequence; Suppression of manipulated variable oscillation by regularized least square solution

Ishikawa, Nobuyuki; Abe, Kenichi*

Denki Gakkai Rombunshi, C, 124(2), p.580 - 581, 2004/02

We have previously proposed the method for designing feedforward element of discrete-time 2DOF controller to realize a desired output response (reference response characteristics). In the method, the feedforward element is designed in the least square sense by solving a linear equation expressing the relation between the output sequence and the design parameter of feedforward element. Since this method is based on the controller parameterized by stable rational function, it is possible to realize desired reference response characteristics approximately even for the non-minimum phase plant by setting the rational function parameter to the polynomial. In this report, the design result by regularized least square solution is presented to suppress the manipulated variable response oscillation especially caused in the case for the non-minimum phase plant.

Journal Articles

An Approximate design method of discrete-time 2DOF controller and its parameter tuning

Ishikawa, Nobuyuki; Abe, Kenichi*

Denki Gakkai Rombunshi, C, 123(2), p.317 - 323, 2003/02

This paper presents a method of designing a feedforward element of 2DOF controller based on the approximation in time domain. Since we deal with the discrete-time 2DOF controller parameterized with rational stable function, the relation of the controller parameter and output sequence is expressed in the form of simple linear equation, through which the feedforward element of 2DOF controller can be designed. In addition, we also propose a controller parameter tuning method to enhance the reference response characteristics of control system by applying the iterative solution commonly utilized in numerical calculation. The results of the numerical simulation show the effectiveness of the proposed methods.

Journal Articles

Estimation of current distribution from magnetic fields by combination method of genetic algorithm and neural-network

Kishimoto, Maki; ; Ara, Katsuyuki

Denki Gakkai Rombunshi, C, 113(9), p.719 - 727, 1993/00

no abstracts in English

Journal Articles

An approach to build knowledge base for reactor accident diagnostic system using statistical method

Kosaka, Atsuo; Yokobayashi, Masao; Matsumoto, Kiyoshi;

Denki Gakkai Rombunshi, C, 108(4), p.246 - 251, 1988/00

no abstracts in English

Journal Articles

A simple method of low X and $$gamma$$ dose rate measurement by planer-type silicon solar cell

; *

Denki Gakkai Rombunshi, C, 97(11), p.215 - 222, 1977/11

no abstracts in English

22 (Records 1-20 displayed on this page)