著者

平岡 裕章 小川 知之 Konstantin Mischaikow

出版者

一般社団法人 日本応用数理学会

雑誌

日本応用数理学会論文誌 (ISSN:24240982)

巻号頁・発行日

vol.13, no.2, pp.191-211, 2003-06-25 (Released:2017-04-08)

参考文献数

15

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This paper presents a numerical verification method for global bifurcation branches of the stationary solutions to dissipative partial differential equations. The key idea is combining verification method based on the Conley Index Theory with a branch chasing algorithm. In this paper, the verification algorithm is described in detail by taking the Swift-Hohenberg equation as an example. Some of the rigorous numerical results are also shown.

著者

Hiroaki OHFUJI Motosuke NAKAYA Alexander P. YELISSEYEV Valentin P. AFANASIEV Konstantin D. LITASOV

出版者

一般社団法人日本鉱物科学会

雑誌

Journal of Mineralogical and Petrological Sciences (ISSN:13456296)

巻号頁・発行日

vol.112, no.1, pp.46-51, 2017 (Released:2017-03-18)

参考文献数

19

被引用文献数

6

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This study revealed for the first time the microtexture and crystallographic features of natural polycrystalline diamond, yakutite found in placer deposits in the Siberian Platform, Russia. Yakutite consists of well–sintered nanocrystalline (5–50 nm) diamond and small amount of lonsdaleite showing distinct preferred orientations. Micro–focus X–ray and electron diffractions showed a coaxial relationship between lonsdaleite 100 and diamond 111, suggesting the martensitic formation of yakutite from crystalline graphite. These textural and crystallographic features are well comparable to those of the impact diamonds from the Popigai crater located in the central Siberia and strongly support the idea that yakutite is a product of long–distance outburst from the Popigai crater, which has been inferred merely from the geochemical signatures.

著者

Gunji Abe Konstantin Zhukov

出版者

ロシア・東欧学会

雑誌

ロシア・東欧学会年報 (ISSN:21854645)

巻号頁・発行日

vol.1996, no.25, pp.107-118, 1996 (Released:2010-05-31)

参考文献数

20

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On July 12, immediately after the presidential elections, Boris Yeltsin called for the creation of a“national idea”. He said that various stages in Russian history-monarchy, totalitarianism, perestroika - each had their own ideology, but that the current democratic path of government does not have one. He called for the new ideology to be defined within one year. One may therefore conclude, that by now it has been clear for everybody in Russia including the ruling circles, that, in writer and Nobel Prize Laureate Aleksandr Solzhenitsyn's words, ' Booty-became the new (and how paltry) Ideology'. Historically, the development of the Russian state ideology in the 19th century was linked to the Eastern Question. The resolution of this question in terms of the partition of the declining Ottoman Empire between the then Great Powers was a matter of great concern to Russians, who believed Russia the legitimate heir of Constantinople and the natural protector of the Slavonic and Orthodox population of the Ottoman Empire. Under the Soviet regime, the Balkans lost their former importance. Nor longer religious or ethnic community counted for a lot, while the previous strategic importance of the region had been greatly diminished. In the early 1990s, for many Russians the Balkan crisis became a dangerous scenario which might happen to the Russian Federation and the other former republics of the USSR. Others, however, viewed it as an opportunity for Russia to reassert her traditional influence in the Balkans and to re-establish her status and prestige on the world stage. Both these aspects should be taken into consideration when analysing the motivation of Russian initiatives seeking the resolution of the crisis such as the prevention of Yugoslavia's complete expulsion from the UN in 1992 or the deployment of Russian troops to Sarajevo in February 1994. The Russian policy towards the former Yugoslavia has produced unexpected results. Russia has not been treated by other countries as a scape-goat, as used to be during Balkan troubles in the past. However, the foreign policy has been criticized severely inside the country. It has been discussed by analysts, prominent political figures and writers. Traditionally, Russian writers were very active in public life to the extent, that many of them could be considered as ideologists too. The ideological heritage of the great Russian writers and thinkers of the past has been used intensively in recent polemics concerning a new Russian state ideology. There is no doubt this legacy will be used more actively in the years to come. Especially it applies to the views on the Eastern Question, and the Balkan Slavs in particular, which were expressed by Dostoevsky in his The Diary of a Writer, and Nikolai Danilevsky in his famous book Russia and Europe. There is another Russian thinker whose ideas are very much in vogue in Russia today. His name is Konstantin Leontiev. As Russian diplomat, he served in the Ottoman Empire from 1863 to 1874. Leontiev formulated his political, cultural and social ideas in his Byzantinism and Slavdom (1876) and The East, Russia, and Slavdom (1885-86) .The paper deals with a number of articles on Russia and the Balkans which have been published in Russian periodicals during recent two years. Having carried out a comparative study of Leontiev's views on the place Russia should assume in the Balkans and the opinions of some modern writers, the authors came to the conclusion that, first, for many Russians “the lessons of Leontiev” sill remain untaught and, second, a new state ideology is unlikely to be created in a relatively short time.

著者

Mario KOBALD Christian SCHMIERER Ulrich FISCHER Konstantin TOMILIN Anna PETRAROLO

出版者

THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

雑誌

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN (ISSN:18840485)

巻号頁・発行日

vol.16, no.3, pp.312-317, 2018 (Released:2018-05-04)

参考文献数

36

被引用文献数

1 5

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Hybrid rocket propulsion offers inherent safety during handling and launch operations at low cost. This makes it not only attractive for space tourism applications like SpaceShipTwo but also for sounding rockets and for educational activities with students. This has been successfully demonstrated by the HyEnD student project from the University of Stuttgart: On November 8th, 2016 at 10:30 a.m. the hybrid sounding rocket HEROS 3 was launched from the Esrange Space Center to an apogee altitude of 32,300 m (106,000 ft). This set a new altitude record for European student and amateur rocketry. Furthermore, this is a world altitude record for hybrid rockets built by students. It was successfully recovered with the drogue and main parachute being released. The rocket was powered by a 10 kN design thrust hybrid rocket engine with a paraffin-based fuel and Nitrous Oxide (N2O) as the oxidizer. The combustion efficiency was verified to be above 97% in ground tests. Liquid burn time in the flight was for 15 s with an additional combustion of gaseous N2O in the blow-down mode of about 10 s. The rocket was 7.5 m long with an empty mass of about 75 kg. The rocket structure was made completely from light-weight carbon fibre and glass fibre reinforced plastic.

著者

大藤 弘明 山下 智晴 Konstantin Litasov Valentin Afanasiev Nikolai Pokhilenko

雑誌

日本地球惑星科学連合2014年大会

巻号頁・発行日

2014-04-07

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Large meteoritic impact occasionally produces an extensive amount of diamond on the surface of the Earth [1, 2]. Popigai crater located in the north central Siberia is a typical example of such diamond-forming shock events and has recently been brought back into the spotlight due to its vast estimated reserves of the impact diamonds [2-4]. Authigenic impact diamonds occur in shocked graphite-bearing garnet-biotite gneisses that are found as inclusions in impact melt rocks, so-called tagamites and suevites. Popigai diamonds occur as irregular to tabular grains of 0.5-2 mm size (up to 10 mm) and usually show yellow, gray or black colors [3]. Electron microscopic (SEM and TEM) observations in previous studies described that they are polycrystalline aggregates of 0.1-1 μm grains and show a distinct preferred orientation along the [111], which is in a coaxial relation to the [001] of the original graphite source [2-4]. This crystallographic feature as well as the occasional coexistence of lonsdaleite, a metastable carbon polymorph, suggest the Martensitic phase transformation for the potential formation process of the impact diamonds from Popigai crater. However, the textural feature of the impact diamonds and its variation has not fully been examined. Here, we present the result of detailed microtextural observations of impact diamonds from the Popigai crater by transmission electron microscopy (TEM) and discuss the formation mechanism and condition in comparison with those of synthetic diamonds obtained by high pressure and high temperature experiments. In total 10 diamond grains (7 transparent yellowish and 3 black samples) from the Popigai crater were studied. Each sample was first analyzed by a micro-focus XRD equipped with a Mo target and an IP detector. The results showed that transparent samples consist mostly of diamond and occasionally contain lonsdaleite, while black ones are a mixture of graphite, lonsdaleite and diamond, which are all in a coaxial relation as shown by 2D diffraction patterns collected in transmission geometry. Each sample was then transferred to a focused ion beam (FIB) system to cut out TEM foil sections perpendicular to the surface (of the tabular grains). TEM observation revealed that although all the samples commonly possess layered structures and preferred orientation (mostly along [111] of diamond), there are varieties in crystallite (grain) size (down to 10-20 nm) and degree of preferred orientation. Taking into account the similarity in texture and preferred orientation feature between the Popigai diamonds and synthetic diamond, the variation is likely derived from the small difference in crystallinity of the starting graphite sources and perhaps more significantly from the difference in shock temperature. According to the shock features recorded in the silicate minerals of the diamond-bearing impactites, the threshold pressure for the onset of the graphite-diamond transformation is estimated to be 34-36 GPa [3]. However, our recent experimental synthesis [5] demonstrated that a similar phase assembly (mostly diamond + traces of lonsdaleite) and microtexture can be produced at much lower pressures of 15-25 GPa at > 2000℃. The shock pressure as well as shock- and post-shock temperature accompanied with the formation of the Popigai crater might be needed to be reevaluated carefully to understand the real nature of the giant impact. [1] Masaitis V.L. (1998) Meteoritics & Planetary Science. 33. 349-359.[2] Langenhorst F., Shafranovsky G.I., et al. (1999) Geology. 27. 747-750.[3] Deutsch A., Masaitis V.L., et al. (2000) Episodes. 23. 3-11.[4] Koeberl C., Masaitis V.L., et al. (1997) Geology. 25. 967-970.[5] Isobe F., Ohfuji H., et al. (2013) Journal of Nanomaterials. 2013. 380165.

著者

サルキソフ コンスタンチン Konstantin SARKISOV ロシア外交アカデミー日本・北東アジア研究所

出版者

京都産業大学世界問題研究所

雑誌

京都産業大学世界問題研究所紀要 = The bulletin of the Institute for World Affairs, Kyoto Sangyo University (ISSN:03885410)

巻号頁・発行日

vol.26, pp.51-66, 2011

著者

Konstantin eingeleitet und übersetzt von Klaus Martin Girardet

出版者

Herder

巻号頁・発行日

2013