On Fundamental Concepts and Legal System Construction of Carbon Emission Trading Regulation in China

LIU JUNYU(유준우),XU YIXIANG(서의상) 동아대학교 법학연구소 2024 國際去來와 法 Vol.- No.45

Simultaneous Quantification of Multiple Alkaloids in Sophora Flavescens Ait and Human Urine by HPLC

Junyu Liu,Hongyuan Yan,Kyung Ho Row 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.5

This study developed a simple and sensitive liquid chromatography method to quantify the multiple active alkaloids (matrine, sophocarpine, and sophoridine) from sophora flavescens ait in urine samples simultaneously. The results showed that liquid- liquid extraction using water as the solvent could effectively isolate all the analyses with the lowest matrix effects. A low concentration of diethylamine (0.07%, v/v) in the mobile phase improved dramatically the resolution of all the alkaloids with less interference from the matrix. Good linearity ranging from 0.025 to 1250.0 μg/mL for all analytes was obtained, and the accuracy and precision varied from 73.25 to 87.86% and 1.4 to 2.2%, respectively. Finally, the suitability of the proposed method was demonstrated in the urinary drug excretion of 4 volunteers receiving an oral dose of a sophora flavescens ait extract. The intra and inter RSD were ≤ 1.9% This study developed a simple and sensitive liquid chromatography method to quantify the multiple active alkaloids (matrine, sophocarpine, and sophoridine) from sophora flavescens ait in urine samples simultaneously. The results showed that liquid- liquid extraction using water as the solvent could effectively isolate all the analyses with the lowest matrix effects. A low concentration of diethylamine (0.07%, v/v) in the mobile phase improved dramatically the resolution of all the alkaloids with less interference from the matrix. Good linearity ranging from 0.025 to 1250.0 μg/mL for all analytes was obtained, and the accuracy and precision varied from 73.25 to 87.86% and 1.4 to 2.2%, respectively. Finally, the suitability of the proposed method was demonstrated in the urinary drug excretion of 4 volunteers receiving an oral dose of a sophora flavescens ait extract. The intra and inter RSD were ≤ 1.9%

Synthesis and characterization of cross linked N-methylene phosphonic chitosan resin chelated with Al(III) for use as adsorbent for fluoride removal from aqueous solutions

Junyu Fan,Longhua Yu,Xin Zhou,Jie Liu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2

Excessive fluoride in groundwater is becoming a worldwide environmental problem increasing the risk of fluorosis. In this study, an eco-friendly new defluorination resin (Al-CPCM) was synthesized by a modified emulsion method. The skeleton of the resin is cross-linked N-methylene phosphonic chitosan and the incorporated Al(III) is the binding site of fluoride. The batch experiments conducted using pure synthetic sodium fluoride solutions showed that Al-CPCM exhibited a fast fluoride removal within 30min, maintained stability from pH 3-10. Effect of presence of other anions was studied by adding one extra anion at a time and it was observed that presence of phosphate and carbonate ions significantly degraded the adsorption capacity of the resin. The maximum adsorption capacity was 15.067mg/g at 30 oC and the adsorption behavior was well-fitted with the pseudo-second-order kinetic model and Hill isotherm model. The results of in-situ flow ATR-FTIR and thermodynamics studies show that the fluoride adsorption dominantly implemented by ion exchange with surface hydroxyl of chelated Al3+ in the resin. In addition, the adsorption capacity only decreased by 5.5% after six successive sorption/desorption cycles, indicating a better regeneration efficiency among other defluorinated resins. Finally, a column experiment was performed using ground water and, in this case, it is observed that the adsorption capacity of the resin was much lower and the decrease in adsorption capacity after elution/regeneration is was larger (both mainly due to the presence of alternate anions/cations in the feed solution). More elaborate column experiments with real-life groundwater samples are required to assess the suitability of the proposed resin for use as a commercial adsorbent.

Study of Mechanism of Counter-rotating Turbine Increasing Two-Stage Turbine System Efficiency

Liu, Yanbin,Zhuge, Weilin,Zheng, Xinqian,Zhang, Yangjun,Zhang, Shuyong,Zhang, Junyue Korean Society for Fluid machinery 2013 International journal of fluid machinery and syste Vol.6 No.3

Two-stage turbocharging is an important way to raise engine power density, to realize energy saving and emission reducing. At present, turbine matching of two-stage turbocharger is based on MAP of turbine. The matching method does not take the effect of turbines' interaction into consideration, assuming that flow at high pressure turbine outlet and low pressure turbine inlet is uniform. Actually, there is swirl flow at outlet of high pressure turbine, and the swirl flow will influence performance of low pressure turbine which influencing performance of engine further. Three-dimension models of turbines with two-stage turbocharger were built in this paper. Based on the turbine models, mechanism of swirl flow at high pressure turbine outlet influencing low pressure turbine performance was studied and a two-stage radial counter-rotation turbine system was raised. Mechanisms of the influence of counter-rotation turbine system acting on low-pressure turbine were studied using simulation method. The research result proved that in condition of small turbine flow rate corresponding to engine low-speed working condition, counter-rotation turbine system can effectively decrease the influence of swirl flow at high pressure turbine outlet imposing on low pressure turbine and increases efficiency of the low-pressure turbine, furthermore increases the low-speed performance of the engine.

Characterizing wafer stage transmission errors via binary decision diagram and dynamic fault tree

Junyu Guo,Guo-Zhong Fu,Hong-Zhong Huang,Yu Liu,Yanfeng Li 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.11

The wafer stage, as a key subsystem of the dual-stage lithographic tool, possesses the characteristic of high moving accuracy. The fault tree analysis (FTA), which plays an important role in the design stage of the wafer stage, is performed to distinguish the critical events leading to the overall transmission error. However, in view of the complexity of the wafer stage’s structure and operation mechanism, the binary decision diagrams and dynamic fault tree analysis methods are implemented in this paper to obtain a simplified calculation process and a supplement with the dynamic characteristic respectively. This is not achieved by the traditional FTA method. The event “wafer stage’s repetitive error along X axis exceeds 5 nm” is viewed as the top event of the fault tree. In this paper, we identify the critical factors affecting the kinematic accuracy of the wafer stage.

Numerical Study on Interfacial Contact Characteristics between Composite Transport Media for Fuel Cell Applications

Junyu Chen,Jiawen Liu,Sukkee Um 한국신재생에너지학회 2021 AFORE Vol.2021 No.10

Study of Mechanism of Counter-rotating Turbine Increasing Two-Stage Turbine System Efficiency

Yanbin Liu,Yangjun Zhang,Weilin Zhuge,Xinqian Zheng,Shuyong Zhang,Junyue Zhang 한국유체기계학회 2013 International journal of fluid machinery and syste Vol.6 No.3

Two-stage turbocharging is an important way to raise engine power density, to realize energy saving and emission reducing. At present, turbine matching of two- stage turbocharger is based on MAP of turbine. The matching method does not take the effect of turbines' interaction into consideration, assuming that flow at high pressure turbine outlet and low pressure turbine inlet is uniform. Actually, there is swirl flow at outlet of high pressure turbine, and the swirl flow will influence performance of low pressure turbine which influencing performance of engine further. Three-dimension models of turbines with two-stage turbocharger were built in this paper. Based on the turbine models, mechanism of swirl flow at high pressure turbine outlet influencing low pressure turbine performance was studied and a two-stage radial counter-rotation turbine system was raised. Mechanisms of the influence of counter-rotation turbine system acting on low-pressure turbine were studied using simulation method. The research result proved that in condition of small turbine flow rate corresponding to engine low-speed working condition, counter-rotation turbine system can effectively decrease the influence of swirl flow at high pressure turbine outlet imposing on low pressure turbine and increases efficiency of the low-pressure turbine, furthermore increases the low-speed performance of the engine.

Separation of esbiothrin and D-acetylene C permethrin in electric-mosquito coils by gas chromatography

노경호,Junyu Liu 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1

A simple and sensitive gas chromatography method for the simultaneous determination of esbiothrin and D-acetylene C permethrin in electric-mosquito coils using palmitic acid isopropyl as an internal standard was developed. The electric-mosquito coil samples were extracted with petroleum ether (60-90 oC) and then centrifuged at 2,000 r/min for 2.0 min. The supernatant liquids were collected into a glass bottle and 2.0 μL of it was injected into the gas chromatograph. The results showed that the means recoveries of esbiothrin and acetylene c permethrin ranged from 100.2% to 99.8%. The relative standard deviation (n=10) of allylic permethrin and acetylene C permethrin was 0.44%and 0.26%, respectively. This method is a viable alternative tool to the existing gas chromatography methods for analyzing the content of allylic permethrin and D-acetylene C permethrin in electric-mosquito coil samples.

Nitric Oxide Alleviates Deterioration and Preserves Antioxidant Properties in ‘Tainong’ Mango Fruit During Ripening

Yanfang Ren,Junyu He,Houyu Liu,Guoqing Liu,Xiaoling Ren 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.1

We investigated the effects of nitric oxide (NO) on quality, membrane lipid peroxidation, and antioxidantenzymes in mango (Mangifera indica L. cv ‘Tainong’) fruit during ripening. Fruits were treated with 0.25 mmol·L-1sodium nitroprusside (SNP) by the immersion method and stored at 23°C for 20 days. SNP treatment significantlysuppressed the respiration rate, enhanced fruit firmness, and decreased the rot index, peel color index, and weightloss in the fruit. This treatment also slowed the increase in soluble solids content (SSC) while maintaining highlevels of titratable acidity (TA), ascorbic acid (AsA), and phenolic compounds. Furthermore, SNP treatment enhancedthe antioxidant activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) and reduced theactivities of lipoxygenase (LOX) and polyphenol oxidase (PPO) in mango fruit, which was associated with the reducedaccumulation of malondialdehyde (MDA), superoxide anion radical (O2•-), and hydrogen peroxide (H2O2) comparedwith the control. Therefore, the addition of exogenous SNP has the potential for improving quality and prolongingthe shelf life of mango fruits by protecting them against oxidative damage caused by ROS during ripening.

Multi‑objective parameter optimization of multi‑shaft ring‑plate magnetic gear

Yanjun Ge,Dongning Liu,Junyue Yang,Daming Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.3

Parameter setting and optimization are key steps to improving the transmission performance of eccentric permanent magnetgear. Studying this step makes it possible to analyze the transmission relationship between the design parameters, and improve both the operation stability and the carrying capacity of eccentric permanent magnet gear. Taking multi-shaft ring-plate magnet gear (MRMG) as the research object, this paper analyzes the influence of actual structural parameters on torque performance through the comprehensive sensitivity method, and selects the parameters with the greatest influence as the main optimization parameters. Then using the BSO algorithm and the BP neural network, a prediction model of MRMG electromagnetic torque and torque density is established, the relationship between each of the parameters is analyzed, and the optimization parameter points are determined. By comparison with finite element simulations and experiments, the built model and its measured results and FEM analysis are shown to have good accuracy (error < 6%). Moreover, the model can quickly and accurately obtain optimization parameters, and greatly improve the transmission performance of the structure (the maximum torque increases by 15%, and the torque density increases by 36%).