著者

納賀 勤一

出版者

一般社団法人 日本真空学会

雑誌

真空工業 (ISSN:18837174)

巻号頁・発行日

vol.3, no.3, pp.82-89, 1956-03-05 (Released:2009-09-29)

参考文献数

6

著者

藤井 治久

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.56, no.12, pp.493-501, 2013 (Released:2013-12-27)

参考文献数

33

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It is well known that spacecrafts on orbits are charged up due to the interaction with space plasma and high energy charged particles. Those charging phenomena are categorized into two. One is “surface charging” and the other is “internal charging”. The surface charging involves absolute charging of the conductive satellite body and differential charging occurring on different surface materials on the satellite. On the other hand, the internal charging occurs on the insulating materials and/or electrically floating conductors installed inside the spacecraft body. When the level of the differential charging and/or internal charging reaches some threshold, ESD's (Electrostatic Discharges) will possibly occur. The author reviewed these ESD phenomena based on the ground experiments simulating space environments.

著者

國貞 雄治

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.60, no.7, pp.249-255, 2017 (Released:2017-07-15)

参考文献数

47

被引用文献数

2

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We theoretically investigated physisorption on ice Ih and ice XI surfaces, because the physisorption states of adsorbates play important roles in the chemical reaction on the interstellar medium, which generally consists of ice, with the extremely low temperature (10 K) condition. In this paper, we focused on hydrogen molecules as adsorbates because hydrogen is the most abundant element in space. At first, we briefly reviewed the way to treat the van der Waals interaction in density functional theory. We also showed the calculated adsorption states of hydrogen molecules on ice Ih and ice XI surfaces. We found the non-local correlation functional, which can treat the dispersion interaction, improved the potential energies of physisorbed hydrogen molecules on ice Ih and ice XI surfaces.

著者

黒河 明 北條 久男 小林 太吉

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.54, no.3, pp.196-198, 2011 (Released:2011-05-17)

参考文献数

7

被引用文献数

1

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The vibrating quartz oscillator in the viscous-flow gas was observed to compare the pressure (P) dependence between the impedance change (ΔZ) and the frequency change (ΔF). We obtained the ΔZ and the ΔF for Ar, O2, and Ne gases. Among Ar and O2 both the ΔZs and the ΔFs had no intersection with each other. However, Ne gas had the intersections with Ar gas with the ΔZ(P) and with O2 for the ΔF(P). The phenomenon was caused by the Ne property which Ne has smaller mass but larger viscosity compared with Ar and O2. The ΔZ-ΔF property showed that the property of each gas lied in the viscosity descending order, i.e., Ne, Ar, O2. The measurement of (ΔZ, ΔF) property could give the viscosity related information.

著者

泉 富士夫 門馬 綱一

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.53, no.12, pp.706-712, 2010 (Released:2011-01-20)

参考文献数

26

被引用文献数

3

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We have been developing a multi-purpose pattern-fitting system RIETAN-FP and a three-dimensional visualization system VENUS, which have been extensively used for structure refinements of various metal and inorganic materials from neutron powder diffraction data. At first, their outlines and the history of their developments are shortly looked back. The second part describes procedures for analyzing collinear magnetic structures with the combination of VESTA in the VENUS system and RIETAN-FP by taking BiCoO3 for instance. Finally, a new C++ program, Dysnomia, for the maximum entropy method is introduced with emphasis on its new features. Dysnomia excels its predecessor, PRIMA, in computation speed, memory efficiency, scalability, and reliability. In particular, addition of a normal-distribution constraint is effective in obtaining nuclear-density distribution that is physically and chemically reasonable.

著者

小宮山 桂一

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.55, no.1, pp.18-20, 2012 (Released:2012-02-08)

著者

須賀 恭一

出版者

一般社団法人 日本真空学会

雑誌

真空工業 (ISSN:18837174)

巻号頁・発行日

vol.3, no.4, pp.109-114, 1956-04-05 (Released:2009-09-29)

参考文献数

12

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わが国における果汁 (主として柑橘) の生産と消費がここ数年の間に著しい発展を示したことは衆知の通りであるが、その発展が予想外に急激なため生産技術は追随に手一杯といつた感じであつた。その上昨年の柑橘の豊作にともなう製品過剰に重ねて柑橘類の隔年結果に基因する原料高により本年は赤字生産ともいわれる程で、果汁工業もやや頭打ちの状態と考える人もある。然し果汁特に柑橘はわれわれの嗜好にマツチしており、わが国の柑橘果汁の色調は外国のそれよりも優れているから、現在広く市販されているいわゆるオレンジジユースがさらに製造技術の発達により天然果汁を基調としてそれに加うるに新鮮さ、香味などの点でより改善されれば嗜好飲料として益々普及することは明かで、その他栄養飲料としての本格的な天然果汁製品が一層研究し生産されれば柑橘果汁工業の発展は必ずや期して俟つべきものがあると信ずる。このような意味から、果汁の濃縮に当り真空 (といつても低真空であるが) に関係の深い操作面について敢えて概説を試みることにした。果汁といつてもわが国の現状から実際には殆ど柑橘に限られるのは止むを得ない。果実をそのまま食用にすることは時期的に限定され易く運搬・貯蔵にも不便なので、果汁の濃縮が行われる。濃縮といえば唯果汁を濃縮器に送り込めばよいと簡単に考える人が多いが、柑橘は果実の構造が複雑である上に、その果汁は酸化や醗酵を受け易く、フレーバーは容易に破壊され、パルプを残しておくとゼラチン状になり易く、といつてパルプを完全に除去すると芳香が害されるなど種々取扱いに厄介な点がある。従つて濃縮方法の如何を問わず何れの場合も色々な前処理を施すことが必要で、優秀な濃縮機の全価値を発揮するか否かはこの前処理が適当かどうかにあるといつてもよい。

著者

春田 正毅

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.51, no.11, pp.721-726, 2008 (Released:2009-01-15)

参考文献数

40

被引用文献数

3 5

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Gold has long been neglected as a catalyst because of its chemical inertness. However, when gold is deposited as nanoparticles on carbon and polymer materials as well as on base metal oxides and hydroxides, it exhibits unique catalytic properties for many reactions such as CO oxidation at a temperature as low as 200 K, gas phase direct epoxidation of propylene, and aerobic oxidation of glucose to gluconic acid. The structure-catalytic activity correlations are discussed with emphasis on the contact structure, support selection, and the size control of gold particles. Gold clusters with diameters smaller than 2 nm are expected to exhibit novel properties in catalysis, optics, and electronics depending on the size (number of atoms), shape, and the electronic and chemical interaction with the support materials. The above achievements and attempts can be regarded as a modern alchemy that creates valuables by means of the noblest element with little practical use.

著者

柴田 恭

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.60, no.6, pp.201-211, 2017 (Released:2017-07-14)

被引用文献数

1 1

著者

塚原 規志

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.60, no.5, pp.165-169, 2017 (Released:2017-05-12)

参考文献数

25

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By scanning tunneling microscopy and spectroscopy (STM/S), the spin state of a magnetic adsorbate which shows Kondo effect on the non-metal surfaces can be explored from the Kondo resonance. Kondo resonance appears as a zero-bias anomaly in the STS spectra, and I introduce the ways to assign the zero-bias anomaly to be the Kondo resonance and to extract the information of the spin state with my recent research, the Kondo effect of iron phthalocyanine (FePc) molecules on Au(111). The control of the spin state of FePc on Au(111) by coordination chemistry is also introduced as another example.

著者

吉原 一紘

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.56, no.4, pp.153-157, 2013 (Released:2013-05-10)

参考文献数

3

著者

深川 弘彦

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.58, no.3, pp.86-90, 2015 (Released:2015-03-27)

参考文献数

21

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Highly efficient and stable phosphorescent organic-light emitting diodes (PHOLEDs) were demonstrated in view of optimization of emitting and/or carrier transporting materials. The device characteristics of the red PHOLED was improved by selecting a host material, which surrounds the phosphorescent dopant. The host/dopant combination was found to be a crucial factor in obtaining high efficiency and stability in the PHOLEDs. On the other hand, the novel hole-transporting materials were synthesized to improve the efficiency and operational stability of green PHOLEDs. The optimized red and green OLEDs exhibit a maximum external quantum efficiency of about 20% and an expected half lifetime of over 10,000 h with an initial luminance of 1,000 cd/m2.

著者

中山 景次

出版者

一般社団法人 日本真空学会

雑誌

真空 (ISSN:05598516)

巻号頁・発行日

vol.49, no.10, pp.618-623, 2006 (Released:2007-06-29)

参考文献数

23

被引用文献数

3 6

著者

中山 勝矢

出版者

一般社団法人 日本真空学会

雑誌

真空工業 (ISSN:18837174)

巻号頁・発行日

vol.4, no.8, pp.240, 1957-08-05 (Released:2009-09-29)

参考文献数

2

著者

松田 理 オリバーB. ライト

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.53, no.5, pp.336-343, 2010 (Released:2010-06-10)

参考文献数

42

被引用文献数

1

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Ultrashort light pulses absorbed in a medium generate both bulk and surface acoustic waves: we focus here on imaging the surface waves and on monitoring the bulk acoustic waves that propagate in the depth direction. This is done in the time domain by delayed probe light pulses. For the bulk acoustic waves, the generated frequency ranges up to 1 THz. Some studies concerning the ultrafast electron-phonon relaxation in metal films, high frequency generation in semiconductor quantum wells, and high frequency shear acoustic wave generation and detection are reviewed here. For the surface acoustic waves the generated frequency ranges up to 1 GHz, and time-resolved two-dimensional images of the propagation are obtained with micron lateral spatial resolution. This imaging method is applied to anisotropic crystals and phononic crystals to elucidate their acoustic properties.

著者

原 和雄

出版者

一般社団法人 日本真空学会

雑誌

真空 (ISSN:05598516)

巻号頁・発行日

vol.4, no.11, pp.470-473, 1961

著者

森田 清三 杉本 宜昭 オスカル クスタンセ 阿部 真之

出版者

一般社団法人 日本真空学会

雑誌

真空 (ISSN:05598516)

巻号頁・発行日

vol.49, no.11, pp.637-641, 2006 (Released:2007-06-29)

参考文献数

12

著者

深谷 幸信 大野 弘幸

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.56, no.3, pp.97-103, 2013 (Released:2013-04-24)

参考文献数

22

被引用文献数

1

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Development of ionic liquids for biomass processing, especially our recent development of functional ionic liquids has been described. For efficient biomass processing, we analyzed the physical chemistry of ionic liquids, focusing on the possibility to dissolve naturally-derived materials for energy conversion. We herein reviewed design of a wide variety of functional ionic liquids with special ion structure to enable dissolution of cellulose, extraction of valuable materials from biomass, and hydrolysis of cellulose. Moreover, we described a new class of an analytical method to analyze biomass processing with ionic liquids.

著者

土佐 正弘

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.57, no.8, pp.295-298, 2014 (Released:2014-08-25)

参考文献数

5

被引用文献数

1

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Vacuum chambers, components and related systems consist of various materials according to requiring material performance. Austenitic stainless steels have been used for vacuum chambers due to high mechanical strength, anti-corrosion and low outgassing. Aluminum alloy have been used for special vacuum systems such as particle accelerator due to non-magnetism and low radioactivation. Copper has been used for flange gasket due to good ductility. Ceramics have been used for components of electrical insulator, high temperature system and so on due to good stability under harsh environments. Organic materials are less used due to their high outgassing rate compared with inorganic materials. It is important to select and put the right material in the right place in a vacuum system.

著者

村上 浩一

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.53, no.4, pp.265-270, 2010 (Released:2010-05-18)

参考文献数

12

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We review recent works on 1) an isotope effect of penetration of Hydrogen(H) and Deuterium(D) into Silicon through Si/SiO2 interface and 2) H effects for Si nanostructures, as well as summary of hydrogen states in crystal Si. In particular, a new filtering effect of H and D isotope atoms was found for penetration process into crystal silicon (Si) through the interface between a Si and SiO2 native oxide layer. More H atoms are introduced into Si than D for mixing gases. This phenomenon can be tentatively explained in terms of an isotope filtering model of H and D via an intermediate cluster state formed at the interface between the native SiO2 layer and crystal Si. Hydrogen passivation of interface defects is shown to be needed for knowing proper impurity doping effects, and electronic, optical, and magnetic properties in Si nanostructures.