Removal of Uranium from Aqueous Solution by Alginate Beads

Jing Yu,Jianlong Wang,Yizhou Jiang 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3

The adsorption of uranium (VI) by calcium alginate beads was examined by batch experiments. The effects of environmental conditions on U (VI) adsorption were studied,including contact time, pH, initial concentration of U (VI), and temperature. The alginatebeads were characterized by using scanning electron microscopy, transmission electronmicroscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. Fourier transform infrared spectra indicated that hydroxyl and alkoxy groups arepresent at the surface of the beads. The experimental results showed that the adsorption ofU (VI) by alginate beads was strongly dependent on pH, the adsorption increased at pH 3~7,then decreased at pH 7~9. The adsorption reached equilibrium within 2 minutes. Theadsorption kinetics of U (VI) onto alginate beads can be described by a pseudo first-orderkinetic model. The adsorption isotherm can be described by the Redlich-Peterson model,and the maximum adsorption capacity was 237.15 mg/g. The sorption process is spontaneousand has an exothermic reaction.

Curcumin Alleviates the Functional Gastrointestinal Disorders of Mice In Vivo

Jing Yu,Wen-hua Xu,Wei Sun,Zhi-li Guo,Xiao-ling Yu 한국식품영양과학회 2017 Journal of medicinal food Vol.20 No.12

Curcumin is a natural polyphenol extracted from the turmeric rhizome, which has a wide range of biological activities, but until now the effects of curcumin on the gastrointestinal peristalsis have not been fully understood. In vivo study, we observed the effects of curcumin on gastric emptying and intestinal propulsion rates of mice in normal state and in delayed state by atropine (ATR) or nitric oxide precursor L-arginine (L-Arg). An in vitro study explored the direct effects of curcumin on the intestinal contractility, but were studied through measuring spontaneous contraction of isolated jejunum of mice. Our results showed that intragastric administration of curcumin (200 mg/kg/day) for 10–20 days significantly improved gastric emptying and intestinal propulsion rates of mice delayed by ATR. Moreover, intragastric administration of curcumin (200 mg/kg/day) for 15 days also significantly improved mice gastric emptying and intestinal propulsion rates delayed by L-Arg. There was no significant effect on normal gastrointestinal propulsion of mice after intragastric administration of curcumin (200 mg/kg/day) for 1–20 days. When normal isolated jejunum of mice were incubated with curcumin in vitro, the amplitude of the spontaneous contractile waves of jejunum was reduced in a concentration-dependent manner. Moreover, curcumin reduced the amplitude of the contractile waves of jejunum in both contracted and relaxed state induced by acetylcholine or ATR individually. Taken together, our results suggest that curcumin has quite different effects on gastrointestinal peristalsis in vivo and in vitro. Moderate dose of curcumin by intragastric administration for more than 10 days can alleviate the functional gastrointestinal disorders of mice, but cannot affect normal gastrointestinal propulsion.

A Feasibility Study of GAGG-GAPD Detector for Development of DEXA

Jingyu Yang,Byung Jun Min,Jihoon Kang 한국자기학회 2019 Journal of Magnetics Vol.24 No.4

A GAGG-GAPD detector module was proposed and developed for DEXA application and was characterized under various conditions. The proposed detector consists of GAGG and GAPD. The effect of kVp on energy spectra was assessed for different tube voltages in air condition. Also, the effect of the filter on dual energy Xray spectra was examined by using K-edge filter with different thickness. The mean photon energy and beam peak energy are increase linearly from 40 kVp to 80 kVp. The dual energy peaks were located around 32 keV and 65 keV and were considerably isolated. The DEXA phantom image for each steps were clearly resolved. These results demonstrate the feasibility of GAGG-GAPD detector allowing more potential merits than conventional CZT detector for DEXA application.

Ginsenoside Rg3 ameliorates myocardial glucose metabolism and insulin resistance via activating the AMPK signaling pathway

Jingyu Ni,Zhihao Liu,Miaomiao Jiang,Lan Li,Jie Deng,Xiaodan Wang,Jing Su,Yan Zhu,Feng He,Jingyuan Mao,Xiumei Gao,Guanwei Fan 고려인삼학회 2022 Journal of Ginseng Research Vol.46 No.2

Background: Ginsenoside Rg3 is one of the main active ingredients in ginseng. Here, we aimed to confirm its protective effect on the heart function in transverse aortic coarctation (TAC)-induced heart failure mice and explore the potential molecular mechanisms involved. Methods: The effects of ginsenoside Rg3 on heart and mitochondrial function were investigated by treating TAC-induced heart failure in mice. The mechanism of ginsenoside Rg3 for improving heart and mitochondrial function in mice with heart failure was predicted through integrative analysis of the proteome and plasma metabolome. Glucose uptake and myocardial insulin sensitivity were evaluated using micro-positron emission tomography. The effect of ginsenoside Rg3 on myocardial insulin sensitivity was clarified by combining in vivo animal experiments and in vitro cell experiments. Results: Treatment of TAC-induced mouse models with ginsenoside Rg3 significantly improved heart function and protected mitochondrial structure and function. Fusion of metabolomics, proteomics, and targeted metabolomics data showed that Rg3 regulated the glycolysis process, and Rg3 not only regulated glucose uptake but also improve myocardial insulin resistance. The molecular mechanism of ginsenoside Rg3 regulation of glucose metabolism was determined by exploring the interaction pathways of AMPK, insulin resistance, and glucose metabolism. The effect of ginsenoside Rg3 on the promotion of glucose uptake in IR-H9c2 cells by AMPK activation was dependent on the insulin signaling pathway. Conclusions: Ginsenoside Rg3 modulates glucose metabolism and significantly ameliorates insulin resistance through activation of the AMPK pathway.

Social Incentives for Cooperative Spectrum Sensing in Distributed Cognitive Radio Networks

( Jingyu Feng ),( Guangyue Lu ),( Xiangcen Min ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.2

Cooperative spectrum sensing has been considered as a promising approach to improve the sensing performance in distributed cognitive radio networks. However, there may exist some selfish secondary users (SUs) who are unwilling to cooperate. The presence of selfish SUs could cause catastrophic damage to the performance of cooperative spectrum sensing. Following the social perspective, we propose a Social Tie-based Incentive Scheme (STIS) to deal with the selfish problem for cooperative spectrum sensing in distributed cognitive radio networks. This scheme inspires SUs to contribute sensing information for the SUs who have social tie but not others, and such willingness varies with the strength of social tie value. The evaluation of each SU`s social tie derives from its contribution for others. Finally, simulation results validate the effectiveness of the proposed scheme.

Securing Cooperative Spectrum Sensing against Rational SSDF Attack in Cognitive Radio Networks

( Jingyu Feng ),( Yuqing Zhang ),( Guangyue Lu ),( Liang Zhang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.1

Cooperative spectrum sensing (CSS) is considered as a powerful approach to improve the utilization of scarce radio spectrum resources. However, most of CSS schemes assume all secondary users (SU) are honest, and thus offering opportunities for malicious SUs to launch the spectrum sensing data falsification attack (SSDF attack). To combat such misbehaved behaviors, recent efforts have been made to trust schemes. In this paper, we argue that powering CSS with traditional trust schemes is not enough. The rational SSDF attack is found in this paper. Unlike the simple SSDF attack, rational SSDF attackers send out false sensing data on a small number of interested primary users (PUs) rather than all PUs. In this case, rational SSDF attackers can keep up high trustworthiness, resulting in difficultly detecting malicious SUs in the traditional trust schemes. Meanwhile, a defense scheme using a novel trust approach is proposed to counter rational SSDF attack. Simulation results show that this scheme can successfully reduce the power of rational SSDF, and thus ensure the performance of CSS.

A New Methods for Distinguishing Phoswich Detector consisting of LYSO and GAGG

Jingyu Yang,Songhyup Kang,Kanguk Jin,Joomin Kim,Jihoon Kang 한국자기학회 2020 한국자기학회 학술연구발표회 논문개요집 Vol.30 No.2

Behave Well: How to Win a Pop Vacant Band via Cooperative Spectrum Sensing

( Jingyu Feng ),( Guangyue Lu ),( Hong Chang ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.4

Cooperative spectrum sensing (CSS) for vacant licensed bands is one of the key techniques in cognitive radio networks. However, current CSS schemes focus on ensuring an efficient cooperation among secondary users (SUs), but ignoring their competition. At the same time when several SUs want to a vacant band, how to win this pop vacant band for an SU becomes more and more important. Inspired by the idea that an SU who always behaves well will win a pop vacant band more easily, we propose a competition scheme called BehaveWell (BW) in this paper. By analyzing the main threats against CSS, competitive coefficient is introduced to evaluate each SU`s past behaviors in CSS. A higher competitive coefficient is very helpful for an SU to win a pop vacant band. This BW scheme can not only enhance a healthy competition among SUs, but also improve the security of CSS. Simulations verify the effectiveness of the proposed scheme.

Intra-network Dynamics in E-business Models

Jingyu Yan,Woon Kian Chong,Yan Sun,K. L Man,Nan Zhang,Kaiyu Wan,Eng Gee Lim 한국산업정보학회 2014 한국산업정보학회 학술대회논문집 Vol.2014 No.1

Aerodynamic effects of subgrade-tunnel transition on high-speed railway by wind tunnel tests

Jingyu Zhang,Mingjin Zhang,Yongle Li,Chen Fang 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.28 No.4

The topography and geomorphology are complex and changeable in western China, so the railway transition section is common. To investigate the aerodynamic effect of the subgrade-tunnel transition section, including a cutting-tunnel transition section, an embankment-tunnel transition section and two typical scenarios for rail infrastructures, is selected as research objects. In this paper, models of standard cutting, embankment and CRH2 high-speed train with the scale of 1:20 were established in wind tunnel tests. The wind speed profiles above the railway and the aerodynamic forces of the vehicles at different positions along the railway were measured by using Cobra probe and dynamometric balance respectively. The test results show: The influence range of cutting-tunnel transition section is larger than that of the embankment-tunnel transition section, and the maximum impact height exceeds 320mm (corresponding to 6.4m in full scale). The wind speed profile at the railway junction is greatly affected by the tunnel. Under the condition of the double track, the side force coefficient on the leeward side is negative. For embankment-tunnel transition section, the lift force coefficient of the vehicle is positive which is unsafe for operation when the vehicle is at the railway line junction.