Sorption of Eu on MX-80 Bentonite in Na–Ca–Cl Brine Solutions

Jieci Yang,Joshua Racette,Fabiola Guido Garcia,Shinya Nagasaki,Tammy Yang 한국방사성폐기물학회 2022 방사성폐기물학회지 Vol.20 No.2

The sorption of Eu on MX-80 bentonite in Na–Ca–Cl solutions is investigated at a molal proton concentration (pHm) range of 3 to 10 and an ionic strength (I) range of 0.1 to 6 m (mol·kgw−1). The sorption equilibrium of Eu on MX-80 is achieved within 14 to 21 d at I = 0.1 and 6 m. The sorption distribution coefficient (Kd) values of Eu for MX-80 increase as pHm increases from 3 to 6 for all I values, and they are independent of pHm between 8 and 10 at I ≥ 0.5 m. Meanwhile, at I = 0.1 m, the Kd value at pHm = 10 is slightly lower than those at pHm = 8 and 9. The Kd values are not affected by the I values between 0.5 m and 6 m, whereas the Kd value at I = 0.1 m is greater than those at I ≥ 0.5 m, except at pHm = 10. A two-site protolysis nonelectrostatic surface complexation and cation exchange sorption model is applied to the Eu sorption data for I ≤ 4 m, and the equilibrium constants of the sorption reactions are estimated.

노인의 주관적 기대여명에 영향을 미치는 요인: 연령집단별 개입요인 비교

김연경,KIM CLARA TAMMY 한국노년학회 2019 한국노년학 Vol.39 No.4

The purpose of this study was to examine and compare factors affecting the subjective life expectancy among the elderly, and to suggest health practice and social welfare service implications for later life. A total of 4,483 seniors from the 6th wave(2016) of the Korean Longitudinal Study on Aging (KLoSA) were used for analysis. The subjects were divided into three age groups: the young-old (n=2,106, 65~74 years), middle-old (n=1,803, 75~84 years), and oldest-old (n=574, 85 years and older). Control variables were sociodemographic factors and health status factors. Independent variables were health promotion behavior, cognition of public care, participating social activity, economic activity, and receiving basic pension. The data were analyzed using hierarchical multiple regression. The main results were as follows. Health promotion behavior was associated with the young-old. Social activities and economic activity were associated with the young-old and middle-old. Receiving basic pension had a significant impact on all age groups. In the middle-old, significant results were focused on socio-demographic and health status factors compared to other groups. The results of this study will provide basic data for the elderly policy and welfare service and will help to find and improve the important factors for the life of the elderly. 주관적 기대여명(Subjective Life Expectancy)이란 자신의 수명에 대한 평가로, 주관적 인지평가에 그치지 않고, 건강한 삶을 위해 건강증진, 사회적 활동, 경제적 활동 등에서 실천적 행위를 하게 하는 기전으로 알려져 있다. 본 연구는 연령집단별 노인의 주관적 기대여명에 영향을 미치는 요인을 일반적 요인과 개입요인으로 나누어 파악하여 비교해보는 것에 목적이 있다. 연구대상자는 제 6차 고령화연구패널(KLoSA)을 이용하여 연령집단별로 연소노인(65세-74세) 2,106명, 중고령노인(75-84세) 1,803명, 초고령노인(85세 이상) 574명으로 총 4,483명이다. 일반적 요인은 통제변수로써 인구사회학적요인, 건강상태요인을, 개입요인은 독립변수로써 건강증진행위, 공적돌봄인지여부, 공식적 사회활동 참여, 일자리 및 소득보장 등에 해당하는 9가지의 변수를 설정하여 카이제곱검정, ANOVA, t-test, 위계적 다중 회귀분석을 실시하였다. 그 결과 주관적 건강상태와 기초연금은 모든 연령집단의 주관적 기대여명에 영향을 미쳤지만, 그 외의 변수들은 집단별로 차이가 있었다. 공식적 사회활동 참여, 일자리 및 소득보장요인은 연소노인과 중고령노인 집단에서 유의했고, 건강증진행위요인은 연소노인에서만 유의했다. 중고령노인은 다른 연령집단에 비해 개입요인보다 일반적 요인에서 유의미한 결과가 치중된 것으로 나타났다. 본 연구의 결과는 연령집단별 노인의 주관적 기대여명과 남은 노후를 잘 보내기 위한 실천적이고 개입 가능한 요인 탐색에 기초자료를 제공할 수 있을 것이다.

Exploring the Positive Values of Taekwondo Training: A Review

( Ha Young Kim ),( Jae Young Yang ),( Jong Eun Lee ),( Seok San Kim ),( Tammy Crawford ),( Boung Jin Kang ) 국제태권도학회 2017 International Symposium for Taekwondo Studies Vol.2017 No.-

Purpose: While research on the benefits of performing Taekwondo have mainly been focused on physical functioning, practical values through Taekwondo training have rarely been explored. To better understand the positive effects on Taekwondo holistically, this study aims to illuminate the evidence of effective values revealed by the investigation in various Taekwondo research areas. Methods: This study used a literature review to search for research findings related to the practical effects of Taekwondo practice. Results: The review identified significant results supporting physiological, cognitive, emotional, and social values inherent in Taekwondo. The positive values through Taekwondo training were as follows. First, practicing Taekwondo helps improve physical health, such as preventing cardiovascular disease and obesity throughout all ages. Second, Taekwondo trainees appreciated improved concentration in their studies and their improved ability to learn in school. Third, participation in Taekwondo discipline facilitates trainees’ self-esteem, positive emotions on their lives, and cognitive regulations. Fourth, Taekwondo training helped participants learn assertiveness and communication skills. Conclusions: The research findings confirmed the fact that Taekwondo is associated with holistic human development through a systematic training. The current research supports the positive effectiveness of Taekwondo to help participants promote all aspects defined as holistically human. The results suggest Taekwondo provides a variety of benefits for practi-tioners’ bodies and minds, while providing the opportunities of self-discovery regardless of physical ability, age, and psychological problems.

Sorption of Se(-II) on illite, MX-80 bentonite, shale, and limestone in Na – Ca – Cl solutions

Andrew Walker,Joshua Racette,Takumi Saito,Tammy (Tianxiao) Yang,Shinya Nagasaki 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.5

Selenium has been identified as an element of interest for the safety assessment of a deep geologicalrepository (DGR) for used nuclear fuel. In Canada, groundwaters at DGR depths in sedimentary rockshave been observed to have a high ionic strength. This paper examines the sorption behavior of Se(-II)onto illite, MX-80 bentonite, Queenston shale, and argillaceous limestone in NaeCaeCl solutions ofvarying ionic strength (0.1e6 mol/kgw (m)) and across a pH range of 4e9. Little ionic strength dependence for Se(-II) sorption onto all solids was observed except that sorption at high ionic strength (6 m)was generally slightly lower than sorption at low ionic strength (0.1 m). Illite and MX-80 exhibited theexpected results for anion sorption, while shale and limestone exhibited more constant sorption acrossthe pH range tested. A non-electrostatic surface complexation model successfully predicted sorption ofSe(-II) onto illite and MX-80 using the formation of an inner-sphere surface complex and an outer-spheresurface complex. Optimized values for the formation reactions of these surface species were proposed

Influence of Ca–Na–Cl physicochemical solution properties on the adsorption of Se(-II) onto granite and MX-80 bentonite

Racette Joshua,Walker Andrew,Nagasaki Shinya,Yang Tianxiao Tammy,Saito Takumi,Vilks Peter 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10

The adsorption behaviour of Se(-II) onto granite and MX-80 bentonite in CaeNaeCl solutions has been studied utilizing adsorption experiments and surface complexation modelling. Adsorption kinetic experiments allude to steady-state adsorption periods after 7 days for granite and 14 days for MX-80 bentonite. Batch adsorption experiments were carried out to determine the influence that the physicochemical solution properties would have on Se(-II) adsorption behaviour. Adsorption of Se(-II) onto granite and MX-80 bentonite follows the trend of anionic adsorption, with a decrease in Rd values as the solution pH increased. There is also an ionic strength influence on the adsorption of Se(-II) onto granite with a decrease in the Rd value as the ionic strength increased. This effect is not found when observing Se(-II) adsorption onto MX-80 bentonite. Final experiments with a representative groundwater, determined that the adsorption of Se(-II) onto granite and MX-80 bentonite returned Rd values of (1.80 ± 0.10) m3kg1 and (0.47 ± 0.38) m3kg1, respectively. In support of the experiments, a surface complexation modelling approach has been employed to simulate the adsorption of Se(-II) onto granite and MX-80 bentonite, where it was determined that two different surface complexes, ≡S_Se and ≡SOH2 þ_H2Se were capable of simulating Se(-II) adsorption behaviour.

Interaction of NpO+2 with Cl- in Na-Ca-Cl-type solutions at ionic strength of 6M: Effect of presence of Ca ion on interaction

Shinya Nagasaki,Takumi Saito,Satoru Tsushima,Jared Goguen,Tammy Yang 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8

The interaction of NpO+ 2 with Cl- was studied using visibleenear-infrared spectroscopy in NaCl-Ca- Cl2-NaClO4, NaCl-NaClO4, and CaCl2-NaClO4 solutions with ionic strength (I) of 6M. The spectra of NpO+2 around 980 nm varied with Cl- concentration in the NaCl-CaCl2-NaClO4 and NaCl-NaClO4 solutions at [Cle] ≥ 3.5M, but not in the CaCl2-NaClO4 solution. Assuming the 1:1 interaction between NpOþ+ and Cl-, the apparent equilibrium constants at I = 6M were evaluated. The presence of Ca2+ was found to destabilize overall interaction between NpOþ 2 and Cle. The observations were consistent with the density functional theory calculation.

Urine myo-inositol as a novel prognostic biomarker for diabetic kidney disease: a targeted metabolomics study using nuclear magnetic resonance

( Soie Kwon ),( Jin Seong Hyeon ),( Youngae Jung ),( Lilin Li ),( Jung Nam An ),( Yong Chul Kim ),( Seung Hee Yang ),( Tammy Kim ),( Dong Ki Kim ),( Chun Soo Lim ),( Geum-sook Hwang ),( Jung Pyo Lee ) 대한신장학회 2023 Kidney Research and Clinical Practice Vol.42 No.4

Background: As a leading cause of chronic kidney disease, clinical demand for noninvasive biomarkers of diabetic kidney disease (DKD) beyond proteinuria is increasing. Metabolomics is a popular method to identify mechanisms and biomarkers. We investigated urinary targeted metabolomics in DKD patients. Methods: We conducted a targeted metabolomics study of 26 urinary metabolites in consecutive patients with DKD stage 1 to 5 (n = 208) and healthy controls (n = 26). The relationships between estimated glomerular filtration rate (eGFR) or urine protein-creatinine ratio (UPCR) and metabolites were evaluated. Multivariate Cox analysis was used to estimate relationships between urinary metabolites and the target outcome, end-stage renal disease (ESRD). C statistics and time-dependent receiver operating characteristics (ROC) were used to assess diagnostic validity. Results: During a median 4.5 years of follow-up, 103 patients (44.0%) progressed to ESRD and 65 (27.8%) died. The median fold changes of nine metabolites belonged to monosaccharide and tricarboxylic acid (TCA) cycle metabolites tended to increase with DKD stage. Myo-inositol, choline, and citrates were correlated with eGFR and choline, while mannose and myo-inositol were correlated with UPCR. Elevated urinary monosaccharide and TCA cycle metabolites showed associations with increased morality and ESRD progression. The predictive power of ESRD progression was high, in the order of choline, myo-inositol, and citrate. Although urinary metabolites alone were less predictive than serum creatinine or UPCR, myo-inositol had additive effect with serum creatinine and UPCR. In time-dependent ROC, myo-inositol was more predictive than UPCR of 1-year ESRD progression prediction. Conclusion: Myo-inositol can be used as an additive biomarker of ESRD progression in DKD.