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Lianmin Ji,Licheng Zhang,Dong Shi,Xiaowu Peng,Jinfeng Li,Yuze zhang,Taoshan Xu,Lijuan Liao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
The degradation of TBP has become a stumbling block to the industrial continuous production of lithiumchloride extraction from brines with high Mg/Li ratio by solvent extraction. To develop a more stable andmore efficient extraction system, a novel amide system, containing newly synthesized extractant N,N-bis(2-ethylhexyl)-2-methoxyacetamide (NBEHMOA), FeCl3 6H2O and sulfonated kerosene, was proposed inthis work. Compared with TBP and N523, NBEHMOA extracted Li+ and H+ in the sequence of TBP ˃NBEHMOA ˃ N523 and N523 ˃ TBP ˃ NBEHMOA respectively. The solution containing 5.5 mol/L LiCland 0.5 mol/L HCl was used as the eluent in the scrubbing process. A Li+ extraction efficiency of 96.7%and 22.31 g/L Li+ in the stripping solution were achieved by the whole process with counter-currenttwelve stages. The extraction mechanism investigated via FT-IR spectroscopy illustrated that the metalions Fe3+ and Li+ were mainly coordinated by the carbonyl C = O in NBEHMOA. This novel amide systemcan successfully achieve the cascade extraction effect for lithium, Li/Mg separation and avoid the generationof phase interface objects through counter-current extraction of lithium from brine at a lower acidity. This work provided a novel extraction system to recover lithium from the higher magnesium/lithiumratio brines.
Li Lan,Jinfeng Wang,Shanhu Chen,Dacheng Li,Hongmei Li,Dayu Liu,Wei Wang,Yaoqiang Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
In this work, an advanced Rh/CeO2–ZrO2 (Rh/CZ) three-way catalyst was synthesized with the assistanceof monoethanolamine. Compared with conventional Rh/CZ, the dispersion and oxidation state of Rhspecies, as well as the hydrothermal aging resistance are remarkably modified. That is, upon agingtreatment, conventional Rh/CZ undergoes severe agglomeration of Rh species and formation of largeamount of reduction-resistive RhO2, resulting in serious catalyst deactivation. Fortunately, after theintroduction of monoethanolamine, the sintering of Rh species and transformation into inactive RhO2upon aging are effectively suppressed. Consequently, improved reducibility and advanced three-waycatalytic activity are achieved for the modified catalyst.
A ZigBee-based Aquiculture Water Quality Monitoring System
Li Jinfeng,Cao Shun 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.10
To overcome the issues of many monitoring measurement points, wide range, complex working environment and difficult link in aquaculture monitoring, a low-cost, low-power real-time ZigBee-based water quality monitoring system is presented. The system collects, transmits, displays, queries the water quality parameters (the temperature, dissolved oxygen concentration, pH value, and water level) and controls the increase oxygen machine. The low-power MSP430F149 and CC2530 RF chip are the core of the system which is constituted with the sensor nodes, routing nodes and coordination nodes. The time synchronization algorithm enables all nodes in the network sleep and wake up synchronously to ensure the reliability of data transmission and reduce power consumption. The test results illustrate that the network packet loss rate is 0.83% when the distance between the two nodes is 80 m, which meets the demands of aquiculture. The system runs stably, measures accurately and can automatically regulate the water quality, has certain market value and wide prospects of application.
Jinfeng Liu,Kun Li,Ningzhi Jin,Herbert Ho-Ching IU 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
In this paper, a detuning factor (DeFac) method is proposed to design the key parameters for optimizing the transfer power and efficiency of an Inductively Coupled Power Transfer (ICPT) system with primary-secondary side compensation. Depending on the robustness of the system, the DeFac method can guarantee the stability of the transfer power and efficiency of an ICPT system within a certain range of resistive-capacitive or resistive-inductive loads. A MATLAB-Simulink model of a ICPT system was built to assess the system’s main evaluation criteria, namely its maximum power ratio (PR) and efficiency, in terms of different approaches. In addition, a magnetic field simulation model was built using Ansoft to specify the leakage flux and current density. Simulation results show that both the maximum PR and efficiency of the ICPT system can reach almost 70% despite the severe detuning imposed by the DeFac method. The system also exhibited low levels of leakage flux and a high current density. Experimental results confirmed the validity and feasibility of an ICPT system using DeFac-designed parameters.
Jinfeng Gong,Fanming Meng,Zhenghua Fan,Huijie Li 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6
Monodisperse 3D lotus-like CeO2 microstructures have beensuccessfully synthesized via controlling the morphology ofCeCO3OH precursors under hydrothermal condition as wellas subsequent calcination. The reaction time wassystematically investigated. XRD, FT-IR, SEM, TEM, XPS,Raman scattering and Photoluminescence (PL) spectra wereemployed to characterize the samples. The lotus-like CeO2hierarchical structures with an average of 4-6 μm arecomposed of many nanoplates of 100-200 nm in thickness asthe petals stacking together to form open flowers and have a fluorite cubic structure. Based on the time-dependent morphologyevolution evidences, a nucleation-dissolution-recrystallization mechanism has been proposed to explain the transformation fromrod-like structures to lotus-like CeO2 hierarchical structures with the increase of reaction time. It is found that there are Ce3+ ionsand oxygen vacancies in surface of samples. The magnetic and photoluminescence measurements indicated that all CeO2samples exhibit excellent ferromagnetism and optical properties at room temperature, and while increasing the reaction time, theferromagnetism and optical properties increase more, which can be reasonably explained for the influences of the differentmorphology of the particles and the concentration of oxygen vacancies and Ce3+ ions.
Huijie Li,Fanming Meng,Jinfeng Gong,Zhenghua Fan,Rui Qin 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.4
CeO2 nanospheres with the core–shell nanostructure have been successfully synthesized by a template-free hydrothermalmethod. The structures, morphologies and optical properties of core–shell CeO2nanospheres were analyzed by X-ray diffraction(XRD), TG, Fourier transform infrared spectroscopy, XRD, EDS, SAED, scanning electron microscopy and transmissionelectron microscopy, UV–Vis diffuse reflectance spectra, Raman analyses. The degradation efficiencies of core–shell CeO2nanospheres for methyl orange were as high as 93.49, 95.67 and 98.28% within 160 min, and the rates of photo degradationof methyl orange by core–shell CeO2nanospheres under UV-light were 0.01693, 0.01782 and 0.02375 min−1. Methyl orangewas degraded in photocatalytic oxidation processes, which mainly gave the credit to a large number of reactive species includingh+,surface superoxide species ·O2−, and ·OH radicals. The core–shell structure, small crystallite size and the conversionbetween Ce3+and Ce4+of CeO2nanospheres were of importance for its catalytic activity. These results demonstrated thepossibility of improving the efficient catalysts of the earth abundant CeO2catalysts.
Liu, Jinfeng,Li, Kun,Jin, Ningzhi,Iu, Herbert Ho-Ching The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
In this paper, a detuning factor (DeFac) method is proposed to design the key parameters for optimizing the transfer power and efficiency of an Inductively Coupled Power Transfer (ICPT) system with primary-secondary side compensation. Depending on the robustness of the system, the DeFac method can guarantee the stability of the transfer power and efficiency of an ICPT system within a certain range of resistive-capacitive or resistive-inductive loads. A MATLAB-Simulink model of a ICPT system was built to assess the system's main evaluation criteria, namely its maximum power ratio (PR) and efficiency, in terms of different approaches. In addition, a magnetic field simulation model was built using Ansoft to specify the leakage flux and current density. Simulation results show that both the maximum PR and efficiency of the ICPT system can reach almost 70% despite the severe detuning imposed by the DeFac method. The system also exhibited low levels of leakage flux and a high current density. Experimental results confirmed the validity and feasibility of an ICPT system using DeFac-designed parameters.
UPERCONVERGENCE OF FINITE ELEMENT METHODS FOR LINEAR QUASI-PARABOLIC INTEGRO-DIFFERENTIAL EQUATIONS
QIAN LI,WANFANG SHEN,JINFENG JIAN 한국산업응용수학회 2004 Journal of the Korean Society for Industrial and A Vol.8 No.2
We consider finite element methods applied to a class of quasi para-bolic integro-differential equations in R<SUP>d</SUP>. Global strong superconvergence, which only requires that partitions are quasi-uniform, is investigated for the error between the approximate solution and the Sobolev-Volterra projection of the exact solution. Two order superconvergence results are demonstrated in W<SUP>1,p</SUP>(Ω) and Lp(Ω), for 2 ≤ p ≤ ∞.
Zheng Li,Qingshan Zhang,Jinfeng An,Huixian Liu,Hexu Sun 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.3
When the dual-axis linear motor is processing components, its accuracy will be affected by the uncertainty and nonlinearity of the system, and the complexity of the processing curve trajectory. The goal is to improve the machining accuracy and response speed of the XY dual-axis permanent magnet synchronous linear motor two-dimensional platform, improve the anti-interference ability, and reduce the contour error. This paper proposes a coupled control method based on dual closed-loop single-axis high-order terminal sliding mode position control (TSMC). First, an improved mathematical model of equivalent contour error is established. Combine the coordinated controller to get the coupling link. Then, to accelerate error convergence and suppress chattering, a high-order terminal sliding mode controller is designed. The single-axis current controller is designed using high-order sliding mode algorithms. Simulations and experiments show the effectiveness and feasibility of the proposed method.