Nihon Kessho Gakkaishi

Online ISSN : 1884-5576
Print ISSN : 0369-4585
ISSN-L : 0369-4585

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Volume 35, Issue 3

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[title in Japanese]

[in Japanese]

1993 Volume 35 Issue 3 Pages 187
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.187

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[title in Japanese]

[in Japanese]

1993 Volume 35 Issue 3 Pages 188-189
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.188

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Computer Simulation of the Structural and Physical Properties of Minerals in the Earth's Deep-Interior

Masanori MATSUI

1993 Volume 35 Issue 3 Pages 190-197
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.190

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We describe the application of the molecular dynamics (MD) method to simulate structures and physical properies, including volume compressibilities, volume thermal expansivities, enthalpies, and atomic thermal vibrations, for the MgSiO₃ polymorphs and iron. The MD simulation is shown to be very useful and powerful for predecting properties especially under conditions unavailable in the laboratory, such as extremes of temperatures and pressures prevailing in the Earth's deep-interior. We use the MD technique to investigate the possibility of high-pressure or high-temperature phase transitions in MgSiO₃ and Fe, which might occur in the deep Earth.

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Direct-space Methods in Phase Determination

Masaaki SHIONO

1993 Volume 35 Issue 3 Pages 198-203
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.198

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A density modification technique for phase determination and refinement is described which replaces all density less than one-fifth of the average peak height by zero. Its effectiveness is demonstrated by applications to small proteins. With high resolution data, the method is successfully applied to phase refinement for Ribonuclease Apl. It has also been shown that for a small protein it is possible to obtain an ab initio solution of the structure by refining from a complete set of random phases for all reflexions.

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Iron in the Crystal Structure of (Mg, Fe) SiO₃ Perovskite

Yasuhiro KUDOH

1993 Volume 35 Issue 3 Pages 204-208
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.204

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The perovskite form of Mg_0.981Fe_0.028Cr_0.011Si_0.979O₃, quenched from 26 GPa and 1900°C in a uniaxial split-sphere-type high-pressure apparatus, was studied. The result of structural refinement indicates that Fe and a small amount of Cr substitute for Mg rather than for Si, contrary to the result of Jackson et al. (1987) who reported Fe in the octahedral site of a perovskite synthesized at 50 GPa and 2000 K in a diamond-anvil cell with laser heating.

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Crystal Structures and Magnetic Properties of AV₆O₁₁ (A=Na, Sr)

Yasushi KANKE

1993 Volume 35 Issue 3 Pages 209-214
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.209

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New phases which contain mixed-valent vanadium; SrV₆O₁₁, SrT_xV_6-xO₁₁ (T=Ti, Cr, Fe) and NaFe₃V₉O₁₉ were synthesized. Crystal structures of them and NaV₆O₁₁ were determined and discussed in comparison with the magnetoplumbite structure. Random cation distributions in SrT_xV_6-xO₁₁ suggest that AT₆O₁₁ phases contain itinerant d-electrons. NaV₆O₁₁, SrV₆O₁₁ and NaFe₃V₉O₁₉ were revealed to show spontaneous magnetization.

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Surface Melting of Solid Hydrogens: A Neutron Scattering Study

Minoru MARUYAMA

1993 Volume 35 Issue 3 Pages 215-219
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.215

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Quasi-elastic neutron scattering has been applied to characterize the surface-mobile layer of films of HD (an isotope of molecular hydrogen) condensed on MgO powder in the coverage range 1.6-9 layers and the temperature range 7-17K (T_m=16.6K) . The close-packed surface has a diffusivity from about 8K, with 0.3 mobile layers and a diffusion coefficient of 1/3 that of bulk liquid HD at T_m. The mobile quantity increases with temperature. The diffusion coefficients are in the range (0.8-3.0) ×10_-5cm₂/s. The partial order remains in the mobile layer where HD molecules jump from site to site on a hexagonal lattice.

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Trehalose Minics a Role of Water in Dryness

Keisuke HIRASAWA

1993 Volume 35 Issue 3 Pages 220-222
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.220

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It has been introduced that trehalose has a possible role in cryptobionts, which are able to be back to life after complete dryness when it become wet again. The simple disaccharide prevents cell components such as proteins, cell membrane and nucleic acid from any damage of denaturation by dryness. It seemes that bonded water is replaced by trehalose on the surface of biomolecules without damage. The understanding for the mechanism is not known yet. Trehalose is a perfect preservative for the storage of unstable biological materials.

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A Program System to Assist Authors in Preparing a Crystal Structure Paper in CIF Form

Kenji OSAKI, Tooru TAGA

1993 Volume 35 Issue 3 Pages 223-224
Published: June 25, 1993
Released on J-STAGE: December 10, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.223

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Program Package for Obtaining Unit-cell Constants and Possible Space Groups from X-ray Powder Diffraction Data

Yoshihito TAKAKI, Tomohiko TANIGUCHI, Kouichi HORI

1993 Volume 35 Issue 3 Pages 225-227
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.225

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[title in Japanese]

[in Japanese]

1993 Volume 35 Issue 3 Pages 228-230
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.228

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[title in Japanese]

[in Japanese]

1993 Volume 35 Issue 3 Pages 231-233
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.231

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[title in Japanese]

[in Japanese]

1993 Volume 35 Issue 3 Pages 234-235
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.234

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[title in Japanese]

[in Japanese]

1993 Volume 35 Issue 3 Pages 236-239
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.236

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[title in Japanese]

[in Japanese]

1993 Volume 35 Issue 3 Pages 240-241
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.240

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[title in Japanese]

[in Japanese]

1993 Volume 35 Issue 3 Pages 242-243
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.242

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...

1993 Volume 35 Issue 3 Pages 244-246
Published: June 25, 1993
Released on J-STAGE: September 30, 2010

DOIhttps://doi.org/10.5940/jcrsj.35.244

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