A novel ‘‘green’’ solvent to deeply purify quartz sand with high yields: A case study

Xiaoxia Li,Tihai Li,Jianxiong Gao,Houquan Huang,Linbo Li,Jingsheng Li 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-

A novel ‘‘green’’ solvent for removing iron and aluminum impurities simultaneously from quartz sandwas presented to replace the outdated industrial strong acids. The solvent is a ‘‘green’’ mixturecomprised nontoxic, renewable acids and a very diluted hydrochloric acid. The new solvent cansignificantly reduce the pollution caused by residual acids and remain the high efficiency in removingimpurities and is harmless to the target product as well. The final optimum removing rate was up to79.1% and 42.3% respectively if its leached residue was washed, then leached again in a 4 g/l Na2CO3solution under ultrasound for 25 min.

Research on The SWIPT System Throughput Based on Interference Signal Energy Collecting

( Jianxiong Li ),( Hailong Jiang ) 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.8

The general interference is the imperative trouble for simultaneous wireless information and power transfer (SWIPT) system. Although interference has bad influences on the performance of the system, it carries energy simultaneously. In this paper, the energy-constrained relay of the SWIPT system needs to spend much time on energy collecting (EC) in the information transmission (IT) period. Therefore, we propose the scheme of interference signal energy collecting (ISEC) when the interference is strong, and the SWIPT system does not carry out IT. The relay of the system continues to collect energy and stores it until the interference has minimal impact on IT. Then the system performs IT. We divide the collected interference energy equally into several parts, and each IT block receives one part. The proposed scheme is appealing because it can reduce the time of EC in IT period to make the relay spends more time forwarding the received signal in order to improve the performance of the system throughput. Furthermore, we propose a time-switching (TS) protocol based on EC at the relay. And it allows the relay forwarding signal at an appropriate power. Under the protocol, the time of EC can be flexible according to the forwarding power that we give so that the collected energy can be used more efficiently. We give the expressions of the system throughput according to the proposed scheme and protocol. Moreover, the influence of the interference power on the system throughput is also studied.

Sertad1 Induces Neurological Injury after Ischemic Stroke via the CDK4/p-Rb Pathway

Jianxiong Li,Bin Li,Yujie Bu,Hailin Zhang,Jia Guo,Jianping Hu,Yanfang Zhang 한국분자세포생물학회 2022 Molecules and cells Vol.45 No.4

SERTA domain-containing protein 1 (Sertad1) is upregulated in the models of DNA damage and Alzheimer’s disease, contributing to neuronal death. However, the role and mechanism of Sertad1 in ischemic/hypoxic neurological injury remain unclear. In the present study, our results showed that the expression of Sertad1 was upregulated in a mouse middle cerebral artery occlusion and reperfusion model and in HT22 cells after oxygen-glucose deprivation/reoxygenation (OGD/R). Sertad1 knockdown significantly ameliorated ischemia-induced brain infarct volume, neurological deficits and neuronal apoptosis. In addition, it significantly ameliorated the OGD/R-induced inhibition of cell viability and apoptotic cell death in HT22 cells. Sertad1 knockdown significantly inhibited the ischemic/hypoxic-induced expression of p-Rb, B-Myb, and Bim in vivo and in vitro. However, Sertad1 overexpression significantly exacerbated the OGD/R-induced inhibition of cell viability and apoptotic cell death and p-Rb, B-Myb, and Bim expression in HT22 cells. In further studies, we demonstrated that Sertad1 directly binds to CDK4 and the CDK4 inhibitor ON123300 restores the effects of Sertad1 overexpression on OGD/R-induced apoptotic cell death and p-Rb, B-Myb, and Bim expression in HT22 cells. These results suggested that Sertad1 contributed to ischemic/hypoxic neurological injury by activating the CDK4/p-Rb pathway.

Improved Particle Swarm Optimization Algorithm for Adaptive Frequency-Tracking Control in Wireless Power Transfer Systems

Yang Li,Liu Liu,Cheng Zhang,Qingxin Yang,Jianxiong Li,Xian Zhang,Ming Xue 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5

Recently, wireless power transfer (WPT) via coupled magnetic resonances has attracted a lot of attention owing to its long operation distance and high efficiency. However, the WPT systems is over-coupling and a frequency splitting phenomenon occurs when resonators are placed closely, which leads to a decrease in the transfer power. To solve this problem, an adaptive frequency tracking control (AFTC) was used based on a closed-loop control scheme. An improved particle swarm optimization (PSO) algorithm was proposed with the AFTC to track the maximum power point in real time. In addition, simulations were carried out. Finally, a WPT system with the AFTC was demonstrated to experimentally validate the improved PSO algorithm and its tracking performance in terms of optimal frequency.

Down-regulation of microRNA-155 suppressed Candida albicans induced acute lung injury by activating SOCS1 and inhibiting inflammation response

Li Xiaohua,Gong Yuanzhong,Lin Xin,Lin Qiong,Luo Jianxiong,Yu Tianxing,Xu Junping,Chen Lifang,Xu Liyu,Hu Ying 한국미생물학회 2022 The journal of microbiology Vol.60 No.4

Acute lung injury caused by Candida albicans could result in high mortality and morbidity. MicroRNA-155 (miR-155) and suppressor of cytokine signaling 1 (SOCS1) have been believed to play a key in the regulation of inflammatory response. Whether miR-155/SOCS1 axis could regulate the acute lung injury caused by C. albicans has not been reported. The acute lung injury animal model was established with acute infection of C. albicans. miR-155 inhibitor, miR-155 mimic, and sh-SOCS1 were constructed. The binding site between miR- 155 and SOCS1 was identified with dual luciferase reporter assay. Knockdown of miR-155 markedly inhibited the germ tube formation of C. albicans. Knockdown of miR-155 significantly up-regulated the expression of SOCS1, and the binding site between miR-155 and SOCS1 was identified. Knockdown of miR-155 improved the acute lung injury, suppressed inflammatory factors and fungus loading through SOCS1. Knockdown of SOCS1 greatly reversed the influence of miR- 155 inhibitor on the cell apoptosis in vitro. The improvement of acute lung injury caused by C. albicans, suppression of inflammatory response and C. albicans infection, and inhibitor of cell apoptosis were achieved by knocking down miR-155 through SOCS1. This research might provide a new thought for the prevention and treatment of acute lung injury caused by C. albicans through targeting miR-155/SOCS1 axis.

Junction Temperature Estimation Approach Based on TSEPs in Multichip IGBT Modules

Jianxiong Yang,Yanbo Che,Li Ran,Borong Hu,Mingxing Du 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9

Power semiconductor chips are parallelly packed in modules to achieve a specific current capacity and power level. An inhomogeneous degradation of the solder layer makes the junction temperature between chips unevenly distributed in multichip modules. The real matters of the junction temperature represented by the terminal electrical characteristics are not known when a junction temperature difference occurs in the internal chip of a multichip IGBT module. This paper analyzes the electrothermal coupling characteristics among the chips in multichip modules and establishes a mathematical model of the electrothermal relationship. To accurately control the different temperature distributions and uneven aging conditions of paralleled chips, two power modules or two discrete devices packaged in a TO-247 are connected in parallel to simulate a multichip power module. The correctness of the proposed electrothermal model and the feasibility of simulating multichip modules are verified through experiments. The findings indicate that the temperature evaluated by the threshold voltage approaches the maximum temperature of the chips inside the module. The junction temperature evaluated by the maximum change rate of the collector–emitter voltage and that of the collector current approach are used to obtain the average temperature.

Differences in Phase Change Processes Upon Heating Between Co and Zn-ZIF-4 Compounds

Kaihui Li,Haiyan Xiao,Jianxiong He,Hong Jiang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.3

Zn and Co-ZIF-4 meta-stable compounds adopt the same topology of Zeolitic imidazolate frameworks (ZIF)-4, but differ in the metal nodes (Zn versus Co). Using calorimetric and thermogravimetric analysis, here we characterized their differences in phase change processes. Upon heating, the framework of Co-ZIF-4 meta-stable crystal undergoes the crystal-to-amorphous phase transition at 590 K, which is somewhat lower than the corresponding transition previously reported in the corresponding Zn-ZIF-4. In addition, the recrystallization rate for amorphous Co-ZIF-4 is relatively higher than the corresponding one of Zn-ZIF-4. Finally, the forming Co–zni crystal begins to melt at about 824K, accompanied by quick decomposition, whereas Zn–zni undergoes complete melting which finishes at around 850K without any decomposition. Based on their differences in chemistry for Co and Zn, we elucidated the chemical origin of the discrepancies of phase transition process for Zn and Co-ZIF-4 compounds upon heating.

Significantly Elevated Dielectric and Energy Storage Traits in Boron Nitride Filled Polymer Nano-Composites with Topological Structure

Yefeng Feng,Jianxiong Zhang,Jianbing Hu,Shichun Li,Cheng Peng 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2

Interface induced polarization has a prominent influence on dielectric properties of 0–3 type polymer based composites containingSi-based semi-conductors. The disadvantages of composites were higher dielectric loss, lower breakdown strength andenergy storage density, although higher permittivity was achieved. In this work, dielectric, conductive, breakdown and energystorage properties of four nano-composites have been researched. Based on the cooperation of fluoropolymer/alpha-SiC layerand fluoropolymer/hexagonal-BN layer, it was confirmed constructing the heterogeneous layer-by-layer composite structurerather than homogeneous mono-layer structure could significantly reduce dielectric loss, promote breakdown strength andincrease energy storage density. The former worked for a larger dielectric response and the latter layer acted as a robust barrierof charge carrier transfer. The best nano-composite could possess a permittivity of 43@100 Hz (~ 3.3 times of polymer),loss of 0.07@100 Hz (~ 37% of polymer), discharged energy density of 2.23 J/cm3@249 kV/cm (~ 10 times of polymer)and discharged energy efficiency of 54%@249 kV/cm (~ 5 times of polymer). This work might enlighten a facile route toachieve the promising high energy storage composite dielectrics by constructing the layer-by-layer topological structure.

Finite Time Fully Distributed Consensus Control for Multi-agent System With Input Saturation and Limited Communication Resources

Miao Xu,Yiming Fang,Jianxiong Li,Xiaodong Zhao 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.11

A finite-time fully distributed consensus (FTFDC) control problem is studied for a second-order multiagent system (MAS) with input saturation, limited communication resources and external bounded disturbances. Firstly, to deal with the input saturation characteristics, a second-order auxiliary system is designed to obtain the compensation signal. Secondly, because the leader information can only be obtained by a group of agents connected with the leader, a distributed estimator for each agent is designed to estimate the leader information. Then, to save communication resources, an event trigger condition is designed without continuous communication between agents. Based on the estimator and event trigger condition, a FTFDC controller is designed to realize the finite time fully distributed consensus control of MAS under limited communication resources and external bounded disturbances. Finally, the designed controller is verified by simulation on a multi-spacecraft attitude system model.

Task Offloading of Intelligent Building Based on CO–HHO Algorithm in Edge Computing

Yi Lingzhi,Gao Xieyi,Li Zongpin,Feng Xiaodong,Huang Jianxiong,Liu Qiankun 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6

With the rapid development of intelligent devices, the intelligence of buildings is becoming more and more obvious, which leads to the rapid growth of data generated by building users. The existing network bandwidth is far from enough for the transmission of existing data, which will lead to congestion in the process of data transmission. In this paper, a task offl oading strategy based on edge computing is proposed. The edge server is deployed near the data source, which mainly solves the problems of transmission delay and energy consumption of building users during task offl oading. In this paper, the mathematical model of system delay and energy consumption is established fi rst. In order to better refl ect the quality of the system, the delay and energy consumption are combined into system utility, and then the objective function is established. Since the objective function is a mixed integer nonlinear programming problem, fi nding the optimal solution usually requires exponential time complexity. Therefore, this paper fi rstly uses the Tammer decomposition method to decouple the objective function, and decomposes it into the resource allocation problem of fi xed task offl oading decision and the task offl oad problem of maximizing the objective function. Then the convex optimization (CO) theory is used to greatly reduce the complexity of the objective function and optimize the resource allocation problem. Finally, the task offl oading problem is solved by the improved Harris Hawks Optimization (HHO) . The paper compares various offl oading schemes. The simulation results show that the CO–HHO offl oading strategy based on edge computing proposed in this paper can eff ectively reduce the transmission delay and energy consumption of user tasks in intelligent buildings, and is superior to others in all aspects.