Vacancy Ordering in Vanadium Carbides Based on V_6C_5

The ordered arrangement of carbon vacancies in vanadium carbides near V_6C_5 has been analysed by means of selected-area electron diffraction and high-voltage electron microscopy. A new type of ordered distribution of carbon vacancies is found at non-stoichiometric compositions between V_6C_5 and V_8C_7. This structure can be expressed as a long-period structure consisting of the enantiomorphic domains based on the structure V_6C_5 which was determined by Billingham, Bell and Lewis (1972). The periodic domain boundaries with spacing eleven times the nearest-neighbour interatomic distance are directly observed by electron microscopy

The Interplay of Metaphor and Iconicity: A Cognitive Approach to Poetic Texts

This essay attempts to clarify the interrelationship between the notions of metaphor and iconicity in the theory of cognitive metaphor, particularly in the model of ‘blending’ (Turner and Fauconnier 1995, in press, Fauconnier and Turner 1996, Turner 1996, 1998, among others). In cognitive and semiotic terms, ‘icons’ and ‘metaphors’ share that property of signification ‘motivated’ by similarity. Connecting things of similarity is one of the basic operations of the human mind. The treatment of metaphor and iconicity in an interrelated fashion will provide a more cohesive and integrated explanation of various linguistic phenomena. The list of such phenomena includes word formation, word order, grammaticalisation, semantic change, poetic discourse, signed languages and writing systems, as manifestations of the interplay between metaphor and iconicity. This study shows that poetic texts, in particular, serve as an optimal example in this exploration because in poetic discourse, the interplay of metaphor and iconicity is foregrounded rather than backgrounded as in everyday discourse (Jakobson and Waugh 1979). This paper, therefore, aims to contribute in the following two issues. Firstly, theoretical clarification of the interplay of metaphor and iconicity will be given in cognitive terms. Particularly, with the model of blending, we can specify which part(s) of the metaphorical process - whether the input, generic, or blended spaces - relate(s) to the iconic mapping of form and meaning. Secondly, the analysis will demonstrate how the interplay of metaphor and iconicity is manifested in linguistic signs in general, and in poetic texts in particular. It will be claimed that there are two major types of manifestation: (i) that there are iconic moments in metaphor; and (ii) that a form acquires an iconic meaning via metaphor

On the Crystalline Approximants of the Al-Mn, Al-Pd and Al-Mn-Pd Type Decagonal Quasicrystals

On the basis of atomic clusters of decagonal quasicrystals, subunits of decagonal quasicrystals are proposed as the results of aggregation of the atomic clusters. The structure of the crystalline approximants can be characterized as some simple periodic tiling of the subunits. This is shown as a new approach to study the structure of the new crystalline approximants

Discovery of Strong Radiative Recombination Continua from The Supernova Remnant IC 443 with Suzaku

We present the Suzaku spectroscopic study of the Galactic middle-aged supernova remnant (SNR) IC 443. The X-ray spectrum in the 1.75-6.0 keV band is described by an optically-thin thermal plasma with the electron temperature of 0.6 keV and several additional Lyman lines. We robustly detect, for the first time, strong radiative recombination continua (RRC) of H-like Si and S around at 2.7 and 3.5 keV. The ionization temperatures of Si and S determined from the intensity ratios of the RRC to He-like K-alpha line are 1.0 keV and 1.2 keV, respectively. We thus find firm evidence for an extremely-overionized (recombining) plasma. As the origin of the overionization, a thermal conduction scenario argued in previous work is not favored in our new results. We propose that the highly-ionized gas were made at the initial phase of the SNR evolution in dense regions around a massive progenitor, and the low electron temperature is due to a rapid cooling by an adiabatic expansion.Comment: 5 pages, 5 figures, accepted by ApJ Lette

Rif1 controls DNA replication by directing Protein Phosphatase 1 to reverse Cdc7-mediated phosphorylation of the MCM complex

Peer reviewedPublisher PD

Jadeite originating from plagioclase in L6 and H6 chondrites

第2回極域科学シンポジウム/第34回南極隕石シンポジウム 11月18日（金） 国立国語研究所 2階講