Otsuma Women's University

About: Otsuma Women's University is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Differential scanning calorimetry & Population. The organization has 422 authors who have published 913 publications receiving 12796 citations. The organization is also known as: Otsuma-Joshi-Daigaku.

Multi-Weyl Solutions to the Einstein Equation Coupled with Scalar Field

Abstract: We study the static Einstein equation coupled with a scalar field with axial symmetry. The zero curvature equation both for the scalar field and a part of the metric in the scalar-Einstein equation enables one to obtain soliton solutions for both the scalar field and the metric. Of the infinite series of solutions for the metric and the scalar field we focus on the solution composed of 4-soliton solution of metric and 4-soliton solution of scalar field. We give a physical interpretation of the solution that two Weyls with scalar charges are exactly sustained by the tension of a string lying between the two Weyls. One of the most interesting problems of black holes is the study of bifurcation of a black hole and coalescence of multi black holes_ Before the dynamical behaviors of black holes is understood through the exact solutions of the Einstein equation, we should first understand the static and stationary solutions of multi black holes. In the preceding papers!) we have studied the vacuum soliton solutions to the static Einstein equation which includes the ring-type solutions and the multi-Weyl solution. In the 4-soliton solution or two-Weyl solution, what is peculiar in the solution is the exis­ tence of a conical singularity which may be interpreted as a "cosmic string" or strut between two Weyls. We showed that the string tension cancels the gravitational attractive force. There are two possible solutions which satisfy the asymptotic flatness: (i) The masses of two Weyls could be both positive while the string tension or the line density of the strut is negative; (ii) One of the masses of two Weyls should be negative if the string tension has the positive sign_ Either case comprises physical difficulty: negative mass or negative energy density. Classically there can be several ways for particles to balance despite of their attractive gravitational forces. The first is the introduction of strut to sustain their gravitational forces. The second is the introduction of negative mass to the system of particles. The third is the introduction of another force which can cancel the gravitational attractive force. As for the third one of the realization in the general relativity is the work by Papapetrou and Majumdar (the PM solution)_2) They introduced the coulomb force to cancel the gravitational attractive force. However the electric charge and the mass of each black hole are not independent charges but should satisfy the relation which realizes the extremal case of the Reissner-Nordstrom solution. What if the constraint between the mass and the electric charge are removed? This has not been answered so far. In the general relativity what could be the correspondence to the strut and the negative mass for balancing? This can be answered by showing the exact solutions to the Einstein equation. As far as we consider the vacuum Einstein equation we could not find physically

Accessibility of B-mode Ultrasonic Measurement of Subcutaneous Fat Thickness to the 22 Sites Needed for Clothing Design

Abstract: Information about subcutaneous fat distribution over the entire body is important for clothing design as applied anthropology. The measurement of subcutaneous fat thickness by ultrasonic tomogram overcomes the limitations of skinfold calipers measurement, but its accessibility varies depending on easiness of identifying the fat-muscle interface at the measuring sites. This study examined accessibility of ultrasonic tomograms at 22 body sites in 58 young adult females.Individual differences in the tomographic image at such sites as the triceps, plural echoes from the fat layer at such sites as the trochanter, and the "dead time region"at such sites as the wrist, make the identification difficult. The 22 sites were classified into three groups according to their accessibility to measurement. Seventeen sites were confirmed to be measurable, including the sites such as the buttock and thigh whichare indispensable to the study of the apparent characteristics of the human body and obesity/leanness as a basis for the designing of comfortable clothing. The sites such as posterior neck and posterior sulcus were not considered to be accessible.

Measurement of neutron emission from LiNbO3 fracture process in D2 and H2 atmosphere

Abstract: We reproduced neutron emission in D2 atmosphere from a crushing process of lithium-niobate (LiNbO3) single crystal which was reported previously. The neutron rate was 1 count/h with a confidence level of 92% in D2 atmosphere; on the other hand no neutron was found in H2 atmosphere.

Daily Follow-up of two children for their height measurements from June 1984 to May 1985.

Abstract: 7.5歳の女児と5.6歳の男児の身体高径を1年間毎日朝と晩に測定し,身長,頭頸部の高さ,体幹長,下肢長の成長曲線を描いた。身長と体幹長は成長曲線が朝値の曲線と夕値のそれに分離したが,頭頸高と下肢長は分離しなかった。これは,前者に明らかな日内変動があり(夜間に約1cm 伸び,昼間に約1cm 短縮する),後者にはそれがないことを示すものと考えられる。また,身長と体幹長の曲線は4月に上昇する傾向が観察され,成長の季節変動が示唆された。下肢長と体幹長の曲線から differential growth が観察された。年間増加量では身長増分の90%以上が下肢の伸長に負っていた。