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JAEA Reports

Diffusivity Database (DDB) for Major Rocks; Database for the Second Progress Report

Sato, Haruo

JNC TN8400 99-065, 379 Pages, 1999/10

JNC-TN8400-99-065.pdf:10.42MB

A database for diffusivity for a data setting of effective diffusion coefficients in rock matrices in the second progress report, was developed. In this database, 3 kinds of diffusion coefficients: effective diffusion coefficient (De), apparent diffusion coefficient (Da) and free water diffusion coefficient (Do) were treated. The database, based on literatures published between 1980 and 1998, was developed considering the following points. (1)Since Japanese geological environment is focused in the second progress report, data for diffusion are collected focused on Japanese major rocks. (2)Although 22 elements are considered to be important in performance assessment for geological disposal, all elements and aquatic tracers are treated in this database development considering general purpose. (3)Since limestone, which belongs to sedimentary rock, can become one of the natural resources and is inappropriate as a host rock, it is omitted in this database development. Rock was categorized into 4 kinds of rocks; acid crystalline rock, alkaline crystalline rock, scdimentaly rock (argillaceous/tuffaceous rock) and sedimentary rock (psammitic rock/sandy stone) from the viewpoint of geology and mass transport. In addition, rocks around neutrality among crystalline rock were categorized into the alkaline crystalline rock in this database. The database is composed of sub-databases for 4 kinds of rocks. Furthermore, the sub-databases for 4 kinds of the rocks are composed of databases to individual elements, in which totally, 24 items such as species, rock name, diffusion coefficients (De, Da, Do), obtained conditions (method, porewater, pH, Eh, temperature, atmosphere, etc.), etc. are input. As a result of literature survey, for De values for acid crystalline rock, totally, 207 data for 18 elements and one tracer (hydrocarbon) have been reported and all data were for granitic rocks such as granite, granodiorite and biotitic granite. For alkaline crystallinc rock, ...

JAEA Reports

Acquisitions of effective diffusion coefficients (De) for Ni(II), Am(III), Sm(III) and Se(IV) in bentonite by through-diffusion method

Sato, Haruo

JNC TN8400 99-062, 16 Pages, 1999/10

JNC-TN8400-99-062.pdf:0.81MB

Effective diffusion coefficients (De) for Ni$$^{2+}$$, Sm$$^{3+}$$, Am$$^{3+}$$ and SeO$$_{3}^{2-}$$ were measured as a function of the ionic charge of diffusion species to quantitatively evaluate the effect of ionic charge in compacted bentonite. The De measurements for Ni$$^{2+}$$ and Sm$$^{3+}$$ were carried out for a bentonite dry density of 1.8 Mg$$cdot$$m$$^{-3}$$ with a simulated porewater condition of pH5$$sim$$6 by through-diffusion method. The De values for SeO$$_{3}^{2-}$$ were measured for a bentonite dry density of 1.8 Mg$$cdot$$m$$^{-3}$$ with a simulated porewater condition of pH11. The De measurements for Am$$^{3+}$$ were carried out for the dry densities of 0.8, 1.4 and l.8 Mg$$cdot$$m$$^{-3}$$ with a porewater condition of pH2 in order to check cation exclusion. Sodium bentonite, Kunigel-V1 was used for those measurements. For the measurements of Am, H-typed Kunigel-V1 which interlayer ion (Na$$^{+}$$) was exchanged with H$$^{+}$$ was used, because the experiments are carried out for a low pH range. The order of obtained De values was Sm$$^{3+}$$ $$>$$ Ni$$^{2+}$$ $$>$$ Am$$^{3+}$$ $$>$$ SeO$$_{3}^{2-}$$. These De values were compared to those reported to date. Consequently, the order of De values was Cs$$^{+}$$ $$>$$ Sm$$^{3+}$$ $$>$$ HTO $$>$$ Ni$$^{2+}$$ $$>$$ anions (I$$^{-}$$, Cl$$^{-}$$, CO$$_{3}^{2-}$$, SeO$$_{3}^{2-}$$ TcO$$_{4}^{-}$$, NpO$$_{2}$$CO$$_{3}^{-}$$, UO$$_{2}$$(CO$$_{3}$$)$$_{3}^{4-}$$), showing a tendency of cations $$>$$ HTO $$>$$ anions. Only the De values of Am$$^{3+}$$ were approximately the same degree as those of anions. The reason that the De of Ni$$^{2+}$$ was lower than that of HTO may be because the free water diffusion coefficient (Do) of Ni$$^{2+}$$ is about 1/3 of that of HTO. The cause that the De of Am$$^{3+}$$ was approximately the same degee as those of anions may be because the Do of Am$$^{3+}$$ is about 1/3 of that of HTO and that Am$$^{3+}$$ was electrostatically repulsed from the surface of bentonite by cation exclusion. The formation factors (FF), calculated normalizing Do, were in the ...

JAEA Reports

None

*; *; *

PNC TJ1600 98-001, 43 Pages, 1998/02

PNC-TJ1600-98-001.pdf:0.94MB

None

Oral presentation

Spin orbital coupling observed on iron-based superconductors BaFe$$_2$$As$$_2$$ and PrFeAsO$$_{1-delta}$$

Shamoto, Shinichi; Fukuda, Tatsuo; Kodama, Katsuaki; Ishikado, Motoyuki*; Nakamura, Hiroki; Machida, Masahiko; Baron, A. Q. R.*

no journal, , 

Strong coupling between spin and orbital in iron-based superconductors will be discussed, based on our experimental results of phonon softening of PrFeAsO$$_{1-delta}$$ and anisotopic magnetic moment of BaFe$$_2$$As$$_2$$.

Oral presentation

Gravitational form factors of vector mesons from top-down approach of holographic QCD

Fujii, Daisuke; Iwanaka, Akihiro*

no journal, , 

The gravitational form factors of hadrons are form factors that characterize the matrix elements of the energy-momentum tensor and contain information on the stress distribution inside hadrons. Recently, the gravitational form factors of nucleons have been experimentally extracted and the extremely anisotropic behavior of the nucleon interior has been revealed. In this presentation, we present a study of the gravitational form factors of vector mesons using the Sakai-Sugimoto model, which is one of the top-down approaches to holographic QCD. We show the relationship between the hadron stability condition imposed on the forward limit of the gravitational form factors and the glueball spectra.

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