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Abstract  

Intensified technology convergence, increasing relatedness between technological fields, is a mega-trend in 21st century science and technology. However, scientometrics has been unsuccessful in identifying this techno-economic paradigm change. To address the limitations and validity problems of conventional measures of technology convergence, we introduce a multi-dimensional contingency table representation of technological field co-occurrence and a relatedness measure based on the Mantel–Haenszel common log odds ratio. We used Korean patent data to compare previous and proposed methods. Results show that the proposed method can increase understanding of the techno-economic paradigm change because it reveals significant changes in technological relatedness over time.

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Abstract  

Separation of lithium isotope by NTOE compound was carried out with 0.01M HCl solution. The ion exchange capacity of NTOE was 0.8 meq/g. The separation factor, α=(7Li/6Li) solid (7Li/6Li) liquid was 1.0242 by the elution chromatography. The lighter isotope,6Li was concentrated in the liquid phase, while the heavior isotope,7Li was enriched in the solid phase.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
Tack-Jin Kim
,
Yongju Jung
,
Joon-Bo Shim
,
Si-Hyung Kim
,
Seungwoo Paek
,
Kwang-Rak Kim
,
Do-Hee Ahn
, and
Hansoo Lee

Abstract  

In order to enhance the efficiency of pyrochemical technology, especially electrorefining process, physicochemical data of trivalent uranium in LiCl–KCl eutectic at 773 K were measured, including molar absorptivity, formal potential and diffusion coefficient of U3+ ions. The molar absorptivities of U3+ were determined to be 765 ± 48 and 686 ± 39 M−1 cm−1 at 465 and 550 nm, respectively. The formal potential of U3+/U4+ redox couple and diffusion coefficient of U3+ ions were measured to be −0.308 V vs. Ag/Ag+ and 8.7 × 10−6 M−1 cm−1, respectively. To elucidate the chemical behavior of U3+ ions under the existence of oxide ions, U3+ ions were reacted with oxides ions in situ produced at the LiCl–KCl media. Surprisingly, it was revealed from XRD patterns that UO2 was formed from the reaction between U3+ ions and O2− ions with the molar ratio of 1:1.

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