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138 results on '"Uehara I"'

3. Children's scale errors and object processing:Early evidence for cross-cultural differences

Author

Ishibashi, M., Twomey, K.E., Westermann, G., Uehara, I., Ishibashi, M., Twomey, K.E., Westermann, G., and Uehara, I.

Abstract

Scale errors are observed when young children make mistakes by attempting to put their bodies into miniature versions of everyday objects. Such errors have been argued to arise from children's insufficient integration of size into their object representations. The current study investigated whether Japanese and UK children's (18–24 months old, N = 80) visual exploration in a categorization task related to their scale error production. UK children who showed greater local processing made more scale errors, whereas Japanese children, who overall showed greater global processing, showed no such relationship. These results raise the possibility that children's suppression of scale errors emerges not from attention to size per se, but from a critical integration of global (i.e., size) and local (i.e., object features) information during object processing, and provide evidence that this mechanism differs cross-culturally.

Published
2021

4. Children's scale errors and object processing : Early evidence for cross-cultural differences

Author

Ishibashi, M., Twomey, K.E., Westermann, G., Uehara, I., Ishibashi, M., Twomey, K.E., Westermann, G., and Uehara, I.

Abstract

Scale errors are observed when young children make mistakes by attempting to put their bodies into miniature versions of everyday objects. Such errors have been argued to arise from children's insufficient integration of size into their object representations. The current study investigated whether Japanese and UK children's (18–24 months old, N = 80) visual exploration in a categorization task related to their scale error production. UK children who showed greater local processing made more scale errors, whereas Japanese children, who overall showed greater global processing, showed no such relationship. These results raise the possibility that children's suppression of scale errors emerges not from attention to size per se, but from a critical integration of global (i.e., size) and local (i.e., object features) information during object processing, and provide evidence that this mechanism differs cross-culturally.

Published
2021

42. Structural investigation and hydrogen capacity of CaMg2Ni9: a new phase in the AB2C9system isostructural with LaMg2Ni9

Author

Kadir, K., Kuriyama, N., Sakai, T., Uehara, I., and Eriksson, L.

Abstract

A new ternary magnesium-based alloy CaMg2Ni9has been synthesized, and its crystal structure was determined by Guinier–Hägg X-ray and neutron powder diffraction. The compound has a hexagonal structure and is isostructural with LaMg2Ni9type, with Ca at the La atom site. The hydrogen absorption/desorption properties have been determined by thermal analysis and pressure–composition isotherms. The electrochemical properties of the alloy were also examined.

Published
1999
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44. Structural investigation and hydrogen capacity of YMg2Ni9and (Y0.5Ca0.5)(MgCa)Ni9: new phases in the AB2C9system isostructural with LaMg2Ni9

Author

Kadir, K., Sakai, T., and Uehara, I.

Abstract

New ternary magnesium-based alloys, YMg2Ni9and (Y0.5Ca0.5)(MgCa)Ni9have been synthesized and their crystal structures were determined by Guinier–Hägg X-ray powder diffraction. The compounds are a hexagonal and isostructural with LaMg2Ni9(AB2C9type), in which Y is uniquely at the A site as in YMg2Ni9, and Ca partially occupies both A and B sites. The hydrogen absorption/desorption properties were determined by pressure–composition isotherms. YMg2Ni9does not absorb hydrogen, whereas (Y0.5Ca0.5)(MgCa)Ni9absorbs ∼2 wt.% H2at ∼3.3 MPa and 263 K.

Published
1999
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47. Hydriding behavior of pseudobinary CaAl2−xMx(M = B, Si, 0 ⩽ x ⩽ 1) alloys

Author

Tanaka, H., Miyamura, H., Kuriyama, N., Sakai, T., and Uehara, I.

Abstract

The hydriding behavior of pseudobinary CaAl2−xMx(M = B, Si, 0 ⩽ x ⩽ 1) alloys with the C15 Laves phase structure is examined in the search for new metal hydrides for hydrogen storage. The initial activation for hydriding proceeded at an H2pressure of 3 MPa and at temperatures between 300 and 400°C without changing their phase structure or decomposing thermally. The CaAl1.8B0.2alloy absorbed the largest amount of hydrogen among these alloys, forming CaAl1.8B0.2H0.6at an H2pressure of 1 MPa at 60°C. For alloys with compositions around CaAl1.8M0.2, pressure plateaus were observed in the pressure-composition isotherms. Lattice contractions were also observed in these alloys.

Published
1995
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