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Post-IR IRSL dating of K-feldspar from last interglacial marine terrace deposits on the Kamikita coastal plain, northeastern Japan

Ito K., Tamura T., Tsukamoto S.

Geochronometria

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2017

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Vol. 44, no. 1

352--365

EN

o establish a suitable luminescence dating protocol for marine terrace deposits in Japan, we tested the applicability of K-feldspar post-infrared (IR) infrared stimulated luminescence (IRSL) (pIRIR) dating using a marine isotope stage (MIS) 5e terrace deposit from the Kamikita coastal plain (NE Japan), where independent age control from a tephra is available. One of the most commonly used pIRIR signals, measured at 290°C with the first IR stimulation temperature at 50°C (pIRIR50/290), faded with a mean g2days value of 1.94 ± 0.19%/decade. In contrast, the pIRIR signal with a higher first IR stimulation temperature of 200°C (pIRIR200/290) had a much lower fading rate (g2days = 0.16 ± 0.49%/decade). The average fading-uncorrected and -corrected pIRIR200/290 ages of MIS 5e subtidal sediments obtained from two sampling sites were 126 ± 3 ka and 132 ± 2 ka, which is in good agreement with the independent age control. We conclude that is it is now possible to use pIRIR protocol to estimate the ages of not only marine terraces formed during MIS 5 substages (5a, 5c) but also of older marine terraces, for which age evidence is limited.

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Assessment of participant compliance with a Web-based home healthcare system for promoting specific health checkups

Tamura T., Maeno S., Hattori T., Kimura Y., Kimura Y., Yoshida M., Minato K.

Biocybernetics and Biomedical Engineering

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2014

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Vol. 34, no. 1

63--69

EN

We investigated the effectiveness of a Web-based healthcare system that allows participants to record measurements of blood pressure, body weight, and the number of steps walked per day. After receiving a medical examination, participants were registered on the Web-based system and encouraged to record data. A total of 223 participants initiated contact with the system; however, only 27 monitored their blood pressure on more than 60 days during the 3-month period. Furthermore, only 46 participants monitored their body weight, and 79 monitored the number of steps taken per day. Although specific health checkups are important to prevent diseases, we conclude that existing health checkup monitoring is not sufficient, and we should develop a new Web-based health checkup and monitoring system that is more familiar to the participants.

3

Weak nearly uniform smoothness of the ψ-direct sums (X1 O…O XN)ψ

Kato M., Tamura T.

Commentationes Mathematicae

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2012

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Vol. 52, [Z] 2

171--198

EN

We shall characterize the weak nearly uniform smoothness of the ψ-direct sum (X1 O…O XN)ψof N Banach spaces X1,..., XN, where ψ is a convex function satisfying certain conditions on the convex set [formula]. To do this, a class of convex functions which yield l1-like norms will be introduced. We shall apply our result to the fixed point property for nonexpansive mappings (FPP). In particular, an example which indicates that there are plenty of Banach spaces with FPP failing to be uniformly non-square will be presented.

4

Uniform non l -ness of l∞-sums of Banach spaces

Kato M., Tamura T.

Commentationes Mathematicae

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2009

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Vol. 49, [Z] 2

179-187

EN

We shall characterize the uniform non-l {...} -ness of `l∞-sums of Banach spaces (X1 ⊕ź ź ź⊕Xm)1. As applications, some results on super-reflexivity and the fixed point property for nonexpansive mappings will be presented.

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Uniform non-ln1-ness of l_1-sums of Banach spaces

Kato M., Tamura T.

Annales Societatis Mathematicae Polonae. Seria 1: Commentationes Mathematicae

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2007

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Vol. 47, [Z] 2

161-169

EN

We shall characterize the uniform non-`n1-ness of the `1-sum (X1 +ź ź ź + X_m)_1 of a finite number of Banach spaces X_1, ź ź ź ,X_m. Also we shall obtain that (X_1 +ź ź ź +X_m)_1 is uniformly non-lm+1 if and only if all X_1, . . . ,X_m are uniformly non-square (note that (X_1 + ź ź ź +X_m)_1 is not uniformly non-lm1). Several related results will be presented.

6

Weak nearly uniform soothness and worth property of [fi]-direct sums of Banach spaces

Kato M., Tamura T.

Annales Societatis Mathematicae Polonae. Seria 1: Commentationes Mathematicae

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2006

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Vol. 46, [Z] 1

113-129

EN

We shall characterize the weak nearly uniform smoothness of the fi-direct sum X Y of Banach spaces X and Y . The Schur and WORTH properties will be also characterized. As a consequence we shall see in the [...]-sums of Banach spaces there are many examples of Banach spaces with the fixed point property which are not uniformly non-square.