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Kangkang Sun,Muyu Liu,Kaige Sun,Hongxia Zhang,Yuhan Song,Yangshuai Qiu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
The removal of radioactive 137Cs from nuclear wastewater is still needed to mitigate their high radiologicaltoxicity to living creatures. However, the industrial application of adsorbents is still challengingowing to the complex and costly preparation and slow adsorption rate for Cs wastewater with low concentration. Herein, cost-effective and fast removal of Cs+ is achieved by vermiform expanded graphite(EG) immobilized with potassium copper hexacyanoferrate (KCuHCF) via the in-situ synthesis method. We revealed that the nano-scale KCuHCF granules are dispersed homogeneously on the EG interlayers. With this design, it achieves an excellent Cs removal capacity of 16.24 mg/g within 30 min in ultralowCs concentration and shows high selectivity among various competing ions. We systematically studiedthe associated adsorption mechanism by XPS and ICP, which revealed that ion exchange between the latticeK and Cs played critical roles. Our work paves the way for the design of economical adsorbents forradioactive Cs remediation.
Bi Hongxia,Sun Xingyuan,Shi Hanbing,Ou Zhimin 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
Tert-butyl (3R,5S)-6-chloro-3,5-dihydroxyhexanoate was synthesized using asymmetric reduction of tertbutyl (S)-6-chloro-5-hydroxy-3-oxo-hexanoate with liquid-core immobilized Saccharomyces cerevisiae CGMCC No. 2233. The optimum conditions for preparation of the liquid-core immobilized cells were found to be 2% guar gum,5% CaCl2, 0.8% sodium alginate, capsule diameter 2mm, 0.3% chitosan (1.0×105) solution, and 30 min for formation of the film of liquid-core immobilized cells. The optimum re-cultivation time was 32 h. The optimum reduction conditions were found to be pH 6.8-7.2, 160 r/min, and 30 oC. Conversion was found to reach 100% when initial concentration of substrate was less than 50 g/L. The diastereomeric excess of tert-butyl (3R,5S)-6-chloro-3,5-dihydroxyhexanoate exceeded 99%. The liquid-core immobilized cells retained their effectiveness even after 15 uses.
Security performance analysis of SIMO relay systems over Composite Fading Channels
( Jiangfeng Sun ),( Hongxia Bie ),( Xingwang Li ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.6
In this paper, we analyze the secrecy performance of single-input multiple-output (SIMO) relay systems over κ-μ shadowed fading channels. Based on considering relay model employing decode-and-forward (DF) protocol, two security evaluation metrics, namely, secure outage probability (SOP) and probability of strictly positive secrecy capacity (SPSC) are studied, for which closed-form analytical expressions are derived. In addition, Monte Carlo results prove the validity of the theoretical derivation. The simulation results confirm that the factors that enhance the security include large ratio of (μ<sub>D</sub>,μ<sub>E</sub>), (m<sub>D</sub>,m<sub>E</sub>), (L<sub>D</sub>,L<sub>E</sub>) and small ratio of (k<sub>D</sub>,k<sub>E</sub>) under the high signal-to-noise ratio regime.
Output Feedback Adaptive Control for Stochastic Non-strict-feedback System with Dead-zone
Yumei Sun,Bingwei Mao,Hongxia Liu,Shaowei Zhou 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.10
This paper focuses on the problem of adaptive neural network (NN) control for a class of nonlinear stochastic non-strict feedback system with dead-zone input. A novel adaptive NN output feedback control approach is first proposed for stochastic non-strict feedback nonlinear systems. In order to solve the problem of dead-zone input, a linear decomposition method is proposed. On the basis of the state observer, an output feedback adaptive NN controller is designed by a backstepping approach. It is shown that the proposed controller guarantees that all the signals of the closed-loop systems are semi-globally uniformly bounded in probability. Simulation results further illustrate the effectiveness of the proposed approach.
Xiaohui Li,Hongxia Xu,Bin Gao,Xiaoqing Shi,Yuanyuan Sun,Jichun Wu 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
For the first time, biosorption of lead(II) using a PAHs-degrading bacterium, Herbaspirillum chlorophenolicum FA1, was investigated as a function of initial lead concentration, biomass dosage, pH, and temperature in batch conditions. Results showed that FA1 was highly resistant to lead and grew well even at lead concentration of 200 mg L−1. The kinetic and isotherm data were well described by commonly used models, such as the pseudo-second-order and Langmuir models. Adsorption thermodynamics was spontaneous and endothermic, and FA1 exhibited a high sorption capacity of 151.52 mg g−1. SEM-EDS and FTIR analysis was conducted to further explore the interaction mechanisms.
A Possible Merge of FRET and SPR Sensing System for Highly Accurate and Selective Immunosensing
Jaebeom Lee,Hongxia Chen,이재욱,Fangfang Sun,Cheol-Min Kim,Chulhun L. Chang,Kwangnak Koh 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
Immuno-sensing for high accurate and selective sensing was performed by fluorescence spectroscopy and surface plasmon resonance (SPR), respectively. Engineered assembly of two fluorescent quantum dots (QDs) with bovine serum albumin (BSA) and anti-BSA was fabricated in PBS buffer for fluorescence analysis of fluorescence resonance energy transfer (FRET). Furthermore, the same bio-moieties were immobilized on Au plates for SPR analysis. Naturally- driven binding affinity of immuno-moieties induced FRET and plasmon resonance angle shift in the nanoscale sensing system. Interestingly, the sensing ranges were uniquely different in two systems: e.g., SPR spectroscopy was suitable for highly accurate analysis to measure in the range of 10-15∼-10 ng/mL while the QD fluorescent sensing system was relatively lower sensing ranges in 10-10∼- 6 ng/mL. However, the QD sensing system was larger than the SPR sensing system in terms of sensing capacity per one specimen. It is, therefore, suggested that a mutual assistance of FRET and SPR combined sensing system would be a potentially promising candidate for high accuracy and reliable in situ sensing system of immune-related diseases.
Photoluminescence up-conversion of bioconjugated hybrids on CdTe and Au nanoparticles.
Kim, Seonghoon,Sun, Fangfang,Chen, Hongxia,Koh, Kwangnak,Kyhm, Kwangseuk,Lee, Jaebeom American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.12
<P>Semiconductor nanomaterials have attracted considerable attention in the design of high efficiency PL up-conversion in heterojunctions or nanostructures at extremely low continuous wave (cw)-excitation intensity. In this study, bioconjugated hybrids were constructed using CdTe and Au nanoparticles (NPs), where two-fold PL enhancement was observed in the solution state. These results are in accordance with theoretical predictions of the local-field effects associated with the combined influence of strong localization of the collective plasmon modes in metallic-semiconducting hybrids and multi-photon absorption into its localized plasmon modes. The feasibility of the nanohybrids as sensors was demonstrated by breaking the bioconjugation through thermal stress, which induced a rapid decrease in luminescence intensity. It is believed that the phenomena is applicable to high-compacted optoelectronic devices and sensing systems that take advantage of both quantum confinement effects and nonlinear optical properties.</P>
A Novel Control Method for Drum Level and Pressure Basing on Dynamic Surface
Yuanwei Jing,Hongxia Yu,Xiaoyu Sun 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.6
A novel drum level and pressure simultaneously control method is developed using the dynamic surface control method in this paper which takes account of the output power of units and load change .Certain first-order low-pass filters are introduced into the designing process to avoid the occurrence of high-order derivatives of elements in the system which makes it easy to implement in practical applications. The proposed control method is effective in compensating for the disturbance of load and fuel. Simulation results show that the dynamic surface control method still ensures an accurate result, even if the loads change in a great and parameters of the controlled plant change significantly.
Financing Constraints on Small and Medium-sized Enterprises
Zhongqun WU,Ge Gong,Hongxia Sun 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Many people are concerned with the effects of constraints on small and medium-sized enterprises, but no enough evidences show what the effects are. the paper takes the small land medium-sized enterprises in Guangding province of China as a sample to demonstrate th causes of financing constraints. The study shows that there are main reasons leading to the constraints. in the meanwhile, the present situation of small and medium-sized enterprises financing is analyzed, the relationship between the bank loans and small and medium-sized enterprises financing is discussed, and the shortcomings of small and medium-sized enterprises is studied in the paper. The main conclusions are that it is difficult for small and medium-sized enterprised to satisfy the requirements of bank, and financing constraints have significantly negatively influences on enterprises. This research implies banks and small and medium-sized enterprises can not take responsibility for the constraints, so government should play an important role in mitigating the financing constraints.
A Possible Merge of FRET and SPR Sensing System for Highly Accurate and Selective Immunosensing
Lee, Jae-Beom,Chen, Hongxia,Lee, Jae-Wook,Sun, Fangfang,Kim, Cheol-Min,Chang, Chul-Hun L.,Koh, Kwang-Nak Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
Immuno-sensing for high accurate and selective sensing was performed by fluorescence spectroscopy and surface plasmon resonance (SPR), respectively. Engineered assembly of two fluorescent quantum dots (QDs) with bovine serum albumin (BSA) and anti-BSA was fabricated in PBS buffer for fluorescence analysis of fluorescence resonance energy transfer (FRET). Furthermore, the same bio-moieties were immobilized on Au plates for SPR analysis. Naturally-driven binding affinity of immuno-moieties induced FRET and plasmon resonance angle shift in the nanoscale sensing system. Interestingly, the sensing ranges were uniquely different in two systems: e.g., SPR spectroscopy was suitable for highly accurate analysis to measure in the range of 10$^{-15{\sim}-10$ng/mL while the QD fluorescent sensing system was relatively lower sensing ranges in 10$^{-10{\sim}-6$ng/mL. However, the QD sensing system was larger than the SPR sensing system in terms of sensing capacity per one specimen. It is, therefore, suggested that a mutual assistance of FRET and SPR combined sensing system would be a potentially promising candidate for high accuracy and reliable in situ sensing system of immune-related diseases.