SOC ESTIMATION OF Li-ION BATTERY BASED ON IMPROVED EKF ALGORITHM

Zhengjun Huang,Yongshou Fang,Jianjun Xu 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.2

The state of charge (SOC) is one of the important performance indicators of battery, which provides an important basis for the management and control of Battery Management System (BMS). In view of the characteristics of lithium iron phosphate battery, considering the model accuracy and calculation amount, the equivalent circuit model of improved PNGV was selected. Based on that, an improved Extended Kalman Filter (EKF) algorithm was adopted to estimate the state of charge (SOC) of Li-ion battery, which covariance matrix was modified by the Levenberg-Marquardt method. At the end of this paper, the SOC estimation algorithm was verified by MATLAB simulations. The results show that compared with the standard EKF, the improved EKF has higher estimation accuracy and anti-interference ability, and has better convergence in the estimation process.

Investigation on Microstructure, Hardness and Wear Resistance of Electron Beam Wire-Feeding Deposited Inconel 718 Alloy Coatings

Dongheng Xu,Han Wang,Xuewei Tao,Zhengjun Yao,Shasha Zhang,Moliar Oleksander 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5

The Inconel 718 (IN718) alloy coatings were successfully fabricated using electron beam wire-feeding deposition technology.The macrostructure, microstructure and elemental analysis of the deposited coatings were characterized by OM, SEMand EDS. Moreover, the hardness and wear resistance were also investigated experimentally. The results showed that thecross section of the deposited coatings can be divided into three different regions: clad zone (CZ), fusion zone (FZ) and heataffected zone. Equiaxed dendrites appeared in the CZ while columnar dendrites occurred in the FZ, and discrete fine Lavesphase particles were formed under low beam current while continuous coarse Laves phase particles were found under highbeam current. The EDS results showed that the degree of Nb segregation in FZ is higher than that in CZ. More importantly,the microstructure coarsened and the degree of Nb segregation increased with the increase of beam current. The depositedcoating under the lowest beam current (10 mA) has the highest hardness (263 HV0.2) and the minimum specific wear rate(3.95391 × 10−15 m3/Nm), which is corresponding to the fine microstructure, discrete Laves phase particles and low degreeof Nb segregation under low beam current.

Genome-wide analysis and environmental response profiling of SOT family genes in rice (Oryza sativa)

Rongjun Chen,Yunyun Jiang,Jiali Dong,Xin Zhang,Hongbo Xiao,Zhengjun Xu,Xiaoling Gao 한국유전학회 2012 Genes & Genomics Vol.34 No.5

Sulphotransferase (SOT) catalyses the transfer of a sulphonate group from 3'-phosphoadenosine 5'-phosphosulphate (PAPS)to an appropriate hydroxyl group of various substrates with the parallel formation of 3'-phosphoadenosine 5'-phosphate (PAP). Although several SOTs have been identified and characterized in mammalian, their role in plant is still unclear. In this study, we report genome-wide comprehensive expression analysis of 35 putative SOT genes in rice. The 35 OsSOTs were tandemly arranged into six clusters. The phylogenetic analysis showed that there were 7 subfamilies of OsSOTs and 11 putatively conserved motifs. Six OsSOTs might be pseudogenes,25 have the two motifs which were involved in PAPS binding regions I and IV. Microarray data indicated that all the OsSOTs were expressed almost at the same level but with different patterns: most OsSOTs were expressed exclusively in stigma and ovary and induced by IAA and BAP, several genes were induced by tZ and DMSO and 11 OsSOTs were response to abiotic stress. Further analysis showed that these 11 genes contained cis-regulatory elements responding to abiotic stresses.

Burn-resistant Coatings Lubricated on the Surface of Titanium Alloys

Pingze Zhang,Jun Huang,Hongyan Wu,Qiang Miao,Zhengjun Yao,Zhong Xu,Zhiyong He 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.-

Conventional titanium alloy may be ignited and burnt in conditions of high temperature, high air pressure, and high gas flow velocity. In the present study, burn-resistant coatings have been lubricated by using double glow plasma surface alloying technology. Alloying elements Cr, Mo, and Cu were induced into Ti6Al4V and Ti6.5Al0.3Mo1.5Zr0.25Si substrates through double glow discharged plasma processing, and Ti-Cr, Ti-Mo, and Ti-Cu burn-resistant alloy layers were formed on the surface of the Ti6Al4V and Ti6.5Al0.3Mo1.5Zr0.25Si alloys. The depth of the surface burn-resistant alloy layers could exceed 200 μm and the alloying-element component could reach 90%. Burn-resistant performance experimental results show that if the Cr component(wt%) is over 14%, the Cu component is over 12%, and the Mo component is over 10% in the alloying layers, ignition and burn of titanium alloy are effectively avoided. Conventional titanium alloy may be ignited and burnt in conditions of high temperature, high air pressure, and high gas flow velocity. In the present study, burn-resistant coatings have been lubricated by using double glow plasma surface alloying technology. Alloying elements Cr, Mo, and Cu were induced into Ti6Al4V and Ti6.5Al0.3Mo1.5Zr0.25Si substrates through double glow discharged plasma processing, and Ti-Cr, Ti-Mo, and Ti-Cu burn-resistant alloy layers were formed on the surface of the Ti6Al4V and Ti6.5Al0.3Mo1.5Zr0.25Si alloys. The depth of the surface burn-resistant alloy layers could exceed 200 μm and the alloying-element component could reach 90%. Burn-resistant performance experimental results show that if the Cr component(wt%) is over 14%, the Cu component is over 12%, and the Mo component is over 10% in the alloying layers, ignition and burn of titanium alloy are effectively avoided.

The characteristics of CO2 front dynamic migration in low permeability sandstone oil reservoirs under different miscibility degrees

Jin Yong,Wang Zhilin,Zhang Zhenxin,Lin Bo,Ge Zhengjun,You Qidong,Chen Hao,Liu Xiliang,Xu Chenghao,Gao Shuaiqiang,Wu Yi,Abro Zafar 한국자원공학회 2023 Geosystem engineering Vol.26 No.4

CO2 flooding is a significant technology for oil recovery, to reveal the microcosmic mechanism of CO2 flooding, CO2 slim tube experiments, long core CO2 flooding experiments, gas chromatography analysis experiments, and numerical simulations were carried out. The results show that the miscibility increase can improve the effect of dissolution and diffusion in the CO2-crude oil system, easing the CO2 finger entry phenomena, and delaying gas breakthrough time. Besides, the CO2 -crude oil interaction is enhanced by increasing the pressure difference between the injection well and the production well, which improves the oil recovery of CO2 flooding. Besides, CO2 carries the light and medium components (C4 ~ 25) forward to cross the first miscible zone, which makes the CO2-crude oil system form double miscible zones. This study reveals the rule of CO2 front and light components front under different miscibility degrees of CO2 flooding from the microscopic perspective and deepens the theory of CO2 flooding in low-permeability sandstone reservoirs.

Genome-wide analysis and environmental response profiling of dirigent family genes in rice (Oryza sativa)

Rongjun Chen,Yongrong Liao,Shengbin Liu,Yunyun Jiang,Changqiong Hu,Xuewei Zhang,Xufeng Cao,Zhengjun Xu,Xiaoling Gao,Lihua Li,Jianqing Zhu 한국유전학회 2017 Genes & Genomics Vol.39 No.1

Dirigent (DIR) and DIR-like family genes were involved in lignification or in the response to pathogen infection and abiotic stress in plants. Little is known to us about how rice DIR genes respond to adverse conditions. In this study, we reported genome-wide analysis of 49 DIR or DIR-likes genes in rice. The 49 OsDIRs or OsDIR-likes were tandem arranged into ten clusters. The phylogenetic analysis indicated that the 49 rice DIR and DIR-like genes cluster into five distinct subfamilies, DIR-a and four DIRlike subfamilies (DIR-b/d, and DIR-g, DIR-c, DIR-e). Meta-analysis of microarray gene expression datas indicated that all the OsDIRs or OsDIR-likes were expressed almost at the same level but with different patterns: most OsDIRs or OsDIR-likes were expressed exclusively in stigma and ovary and were induced by IAA and BAP; several genes were induced by trans-zeatin (tZ) and DMSO; 23 OsDIRs or OsDIR-likes were responded to abiotic stress. Our analysis also showed that most of these genes could respond to abiotic stresses, which contained cis-regulatory elements. The present study will provide a useful reference for further functional analysis of the DIR genes in rice.

Drug-loaded microbubble delivery system to enhance PD-L1 blockade immunotherapy with remodeling immune microenvironment

Zheng Jun,Huang Ju,Zhang Liang,Wang Mengna,Xu Lihong,Dou Xiaoyun,Leng Xiaojing,Fang Mingxiao,Sun Yang,Wang Zhigang 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00

Although programmed cell death protein 1 (PD-1)/ programmed cell death-ligand protein 1 (PD-L1) checkpoint blockade immunotherapy demonstrates great promise in cancer treatment, poor infiltration of T cells resulted from tumor immunosuppressive microenvironment (TIME) and insufficient accumulation of anti-PD-L1 (αPD-L1) in tumor sites diminish the immune response. Herein, we reported a drug-loaded microbubble delivery system to overcome these obstacles and enhance PD-L1 blockade immunotherapy.Docetaxel (DTX) and imiquimod (R837)-loaded microbubbles (RD@MBs) were synthesized via a typical rotary evaporation method combined with mechanical oscillation. The targeted release of drugs was achieved by using the directional "bursting" capability of ultrasound-targeted microbubble destruction (UTMD) technology. The antitumor immune response by RD@MBs combining αPD-L1 were evaluated on 4T1 and CT26 tumor models.The dying tumor cells induced by DTX release tumor-associated antigens (TAAs), together with R837, promoted the activation, proliferation and recruitment of T cells. Besides, UTMD technology and DTX enhanced the accumulation of αPD-L1 in tumor sites. Moreover, RD@MBs remolded TIME, including the polarization of M2-phenotype tumor-associated macrophages (TAMs) to M1-phenotype, and reduction of myeloid-derived suppressor cells (MDSCs). The RD@MBs + αPD-L1 synergistic therapy not only effectively inhibited the growth of primary tumors, but also significantly inhibited the mimic distant tumors as well as lung metastases.PD-L1 blockade immunotherapy was enhanced by RD@MBs delivery system.