Successive phase transitions and phase diagrams of the quasi-two-dimensional triangular antiferromagnet Rb4Mn(MoO4)3

Comprehensive experimental studies by magnetic, thermal and neutron measurements have clarified that Rb4Mn(MoO4)3 is a model system of a quasi-2D triangular Heisenberg antiferromagnet with an easy-axis anisotropy, exhibiting successive transitions across an intermediate collinear phase. As a rare case for geometrically frustrated magnetism, quantitative agreement between experiment and theory is found for complete, anisotropic phase diagrams as well as magnetic properties.Comment: 4 pages, 5 figure

The Learning Service for College Students of Special Needs Education Course; Results of a Questionnaire Survey of Students in University of the Ryukyus

琉球大学および鹿児島大学では､平成19年10月より、専門職大学院等教育推進プログラム「生きる教師力を育む特別支援学校教員養成」を実施した。特別支援教育の定着と充実を図るため、先ずはこれにかかわる指導者の養成を喫緊の課題とし、教員養成を目指す事業である。本稿では、学生が大学に期待するサービス等について、質問紙調査の結果の概要を紹介した。これは事業開始翌年度の琉球大学における実態を把握するものである。その結果、将来現場で活躍する教師となるため、どのような教育サービスを受けたいと学生が考えているのか、そうした期待がどのように推移しているのかが明らかになった。紀要論文http://purl.org/coar/resource_type/c_650

Sr/Ca-Ba/Ca systematics in Antarctic Ca-rich achondrites and their origins

The Ca, Sr and Ba contents of six Antarctic polymict eucrites (Y-74450,Y-75011,Y-75015,ALH-765,ALH-78040 and ALH-78132) and a unique Antarctic achondrite (ALH-77005) have been determined by ICP-OES. When the data are plotted in the Sr/Ca-Ba/Ca diagram which enables us to visualize igneous processes such as partial melting and crystal fractionation, the eucrites fall on a crystal fractionation line defined by a set of typical eucrites and the unique achondrite falls on a partial melting line through chondritic Sr/Ca and Ba/Ca ratios. The results suggest that the eucrites are a series of melts evolved from a primary magma by clinopyroxene and plagioclase fractionation, while the unique achondrite is a residual solid phase derived from a chondritic source material by a largescale partial melting

A Classification of Several Yamato-74 Chondrites

Six Yamato-74 chondritic meteorites have been classified, based on iron contents of olivines and orthopyroxenes in their small fragments. The results are as follows : Yamato-74193,-74498 and -74507 are H4-chondrites, Yamato-74367 and -74603 are L4-chondrites, and Yamato-74454 is L5-chondrite

Rapid Simultaneous 17 Elements Analysis of Some Yamato Meteorites by ICP-OES

Seventeen elements in stone meteorites were determined rapidly and simultaneously by ICP-OES (Inductively Coupled Plasma-Optical Emission Spectroscopy). Five antarctic meteorites were classified by using ICP-OES data. The result is as follows : Yamato-74001 and -75028 are H chondrite and Yamato-74035,-74191 and Allan Hills-769 are L chondrite

Oxygen isotopic compositions of petrographically described inclusions from Antarctic unequilibrated ordinary chondrites

Several inclusions from the Antarctic unequilibrated ordinary chondrites (ALH-764 (LL3), ALH-77015 (L3) and Y-790448 (L3)) were excavated and their petrography, chemical and oxygen isotopic compositions were determined. The coherent data indicates that precursors of the ordinary chondrites consist of a mixture of two different solid materials. One is a pre-existing solid enriched in albite component and depleted in ^O component and the other is a solid depleted in albite component and enriched in ^O component. The latter solid material may be an evaporation residue of the former solid material in an ambient gas

Oxygen Isotopes in Several Yamato Meteorites

Oxygen isotopic compositions (^O/^O and ^O/^O) of five Yamato meteorites have revealed that Yamato-7303 (m), -74190,-74191,and -7308 (l), -74013 can be classified as L ordinary chondrites and differentiated meteorites, respectively. The former three meteorites may have been derived from one parent body, and the latter two meteorites are from another parent body in the solar system

Origin and Evolution of Condrules Based on Na/Al-Dispersion and -Convergence in Yamato-74 Ordinary Chondrites

Na/Al convergence has been observed in groundmass of chondrules and matrix from seven Yamato-74 (H, L, 4-5) chondrites. On the other hand, Na/Al dispersion has prevailed in groundmass of chondrules and matrix from Yamato-74191 (L3) chondrite. The results suggest that : (1) Primordial liquid droplets as precursors of the chondrules might be derived from a rapidly cooling solar nebula by fractional condensation. (2) The hot liquid droplets thus formed might be cooled instantaneously by radiation loss in the cooling nebula. (3) The chondrules as quenched products might be subjected to mutual collision during accumulation in the cold nebula. (4) Planetesimals accumulated by the chondrules might be transferred from the place of birth to an unknown hot region in the proto solar nebula

Case study: acquisition of Japanese in aural language by the four year old child whose hearing loss was detected when he was visiting in U. S. with his family

Access to thesis is restricted. Contact Archives and Rare Books. This paper reports the results of language training for a newly diagnosed hearing impaired Japanese child using methods from the CID parent-infant program