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Li, Lin,Zhao, Shuai,Zhang, Zhenxiu,Hu, Hongqi,Kim, Jin-Kuk 한국섬유공학회 2012 Fibers and polymers Vol.13 No.1
Microcrystalline cellulose was reacted with catalytic amounts of 2, 2, 6, 6-tetramethyl-1-piperidine oxoammonium salt (TEMPO), sodium hypochlorite and sodium bromide in $Na_2CO_3/NaHCO_3$ buffer solution at different temperatures ($30^{\circ}C$, $40^{\circ}C$, $50^{\circ}C$). The oxidation procedures included first oxidation and second oxidation. The yield of cellouronic acid produced in the second oxidation was higher than the yield of cellouronic acid produced in the first oxidation at the same oxidation temperature. Moreover, an interesting "high-hydrophilic" phenomenon appeared at higher temperature during microcrystalline cellulose second oxidation ($30^{\circ}C$, $40^{\circ}C$, $50^{\circ}C$). Properties associated with the chemical characteristics are discussed by XRD, FTIR, $^{13}C$-NMR and Laser Particle Analyzer in view of its interesting high-hydrophilic effects.
Tao Meng,Hongqi Ben,Chunyan Li,Guo Wei 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.2
In this paper, an improved passive snubber is investigated in a single-phase single-stage full-bridge boost power factor correction(PFC) converter, by which the voltage spike across primary side of the power transformer can be suppressed and the absorbed energy can be transferred to the output side. When compared with the basic passive snubber, the two single-inductors are replaced by a coupled-inductor in the improved snubber. As a result, synchronous resonances in the snubber can be achieved, which can avoid the unbalance of the voltage and current in the snubber. The operational principle of the improved passive snubber is analyzed in detail based on a single-phase PFC converter, and the design considerations of both the snubber and the coupled-inductor are given. Finally, a laboratory-made prototype is built, and the experimental results verify the feasibility of the proposed method and the validity of the theoretical analysis and design method.
Shaohua Sun,Hongqi Ben,Yingge Li,Leyi Wang,Shuai Yu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Theory of the harmonic current generation of three-phase grid-connected inverter under unbalanced grid conditions is analyzed in detail in this paper. Based on the characteristic of three-phase currents, the structure of three adaptive notch filter(ANF) cells collaborating with fast positive and negative sequence decomposition(FPNSD) cell is proposed, which employs for the extraction of harmonic current. The main function of this harmonic current extraction method is to provide harmonic current for voltage regulation and power control of inverter. Moreover, this method is capable of extracting a selective order of harmonic where elimination of certain harmonic is of concern. The performance and analysis of the proposed structure in this study are verified through experimental cases.
Xuemin Zhong,Hongqi Liu,Xinyong Mao,Bin Li 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.10
This paper proposes a new method to identify the squareness errors of machine tools and gives an optimal method to improve the volumetric compensation accuracy based on the identified squareness errors. The volumetric error model based on screw theory is proposed and the effects of the squareness errors on the volumetric errors have been analyzed to clarify the possibility of improving volumetric error compensation by proper and accurate squareness errors. Then the identification method of the squareness errors is deduced in theory considering a 3-axis horizontal machine tool. With the identified squareness errors, an optimal method to improve volumetric error compensation in machine tools has been proposed. Experiments have verified that the 3 identified squareness errors are in accordance with the measured squareness errors within the accuracy range. Moreover, compared with the traditional measurement of squareness errors not considering the PDGEs, the proposed method is more effective and shows error compensation improvement in the volumetric error compensation process.
Long, Zhi,Gao, Liqin,Li, Yankai,Kang, Baotao,Lee, Jin Yong,Ge, Junjie,Liu, Changpeng,Ma, Shuhua,Jin, Zhao,Ai, Hongqi American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.44
<P>The self-assembly powder (SAP) with varying Nafion content was synthesized and characterized by XRD, XPS, HRTEM, and mapping. It is observed that the oxygen from oxygen functional groups transfers to the surface of Pt and generate PtO during the process of self-assembly with the mechanism of micro galvanic cell, where Pt, carbon black, and Nafion act as the anode, cathode and electrolyte, respectively. The appearance of PtO on the surface of Pt leads to a turnover of Nafion structure, and therefore more hydrophilic sulfonic groups directly contact with Pt, and thus the triple-phase boundary (TPB) has been expanded.</P>
Meng, Tao,Ben, Hongqi,Li, Chunyan,Wei, Guo The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.2
In this paper, an improved passive snubber is investigated in a single-phase single-stage full-bridge boost power factor correction (PFC) converter, by which the voltage spike across primary side of the power transformer can be suppressed and the absorbed energy can be transferred to the output side. When compared with the basic passive snubber, the two single-inductors are replaced by a coupled-inductor in the improved snubber. As a result, synchronous resonances in the snubber can be achieved, which can avoid the unbalance of the voltage and current in the snubber. The operational principle of the improved passive snubber is analyzed in detail based on a single-phase PFC converter, and the design considerations of both the snubber and the coupled-inductor are given. Finally, a laboratory-made prototype is built, and the experimental results verify the feasibility of the proposed method and the validity of the theoretical analysis and design method.
Lili Yang,Zhenxiang Xu,Hongqi Li,Cuiying Wang,Yunqin Wang,Congcong Lu 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4
A new dye intermediate and novel reactive dyes containing both azo and benzsulfonamide auxochromic groupswere synthesized. Their structures were characterized by 1H-NMR, 13C-NMR, MS, IR, and UV-Vis spectral analysis. Thesynthesized dyes were applied to dyeing of cotton fabrics and their dyeing parameters were assessed. The new dyes exhibitedimproved substantivity and fixation property on cotton fabrics compared with the dye C.I. Reactive Black 5 (RB5). Themaximum exhaustion and total fixation values of the reactive dyes appeared when 2 % owf of the dye concentration wasused. The wash fastness and rub fastness of the new dyes reached up to 4 grade and 4-5 grade, respectively. In addition, theyshowed excellent fastness to light. These new dyes seem to be promising candidates for application to dyeing of cotton fibers.
DPW-RRM: Random Routing Mutation Defense Method Based on Dynamic Path Weight
Hui Jin,Zhaoyang Li,Ruiqin Hu,Jinglei Tan,Hongqi Zhang 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.11
Eavesdropping attacks have seriously threatened network security. Attackers could eavesdrop on target nodes and link to steal confidential data. In the traditional network architecture, the static routing path and the important nodes determined by the nature of network topology provide a great convenience for eavesdropping attacks. To resist monitoring attacks, this paper proposes a random routing mutation defense method based on dynamic path weight (DPW-RRM). It utilizes network centrality indicators to determine important nodes in the network topology and reduces the probability of important nodes in path selection, thereby distributing traffic to multiple communication paths, achieving the purpose of increasing the difficulty and cost of eavesdropping attacks. In addition, it dynamically adjusts the weight of the routing path through network state constraints to avoid link congestion and improve the availability of routing mutation. Experimental data shows that DPW-RRM could not only guarantee the normal algorithmic overhead, communication delay, and CPU load of the network, but also effectively resist eavesdropping attacks.
Jian Ren,Xiao Xiao,Li Ruofei,Lv Cheng,Zhang Yu,Leiming Wang,Tao Hong,Hongqi Zhang,Wang Yibo 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
Cavernous malformations (CMs) invading the central nervous system occur in ~0.16–0.4% of the general population, often resulting in hemorrhages and focal neurological deficits. Further understanding of disease mechanisms and therapeutic strategies requires a deeper knowledge of CMs in humans. Herein, we performed single-cell RNA sequencing (scRNA-seq) analysis on unselected viable cells from twelve human CM samples and three control samples. A total of 112,670 high-quality cells were clustered into 11 major cell types, which shared a number of common features in CMs harboring different genetic mutations. A new EC subpopulation marked with PLVAP was uniquely identified in lesions. The cellular ligand‒receptor network revealed that the PLVAP-positive EC subcluster was the strongest contributor to the ANGPT and VEGF signaling pathways in all cell types. The PI3K/AKT/mTOR pathway was strongly activated in the PLVAP-positive subcluster even in non-PIK3CA mutation carriers. Moreover, endothelial-to-mesenchymal transition (EndMT) cells were identified for the first time in CMs at the single-cell level, which was accompanied by strong immune activation. The transcription factor SPI1 was predicted to be a novel key driver of EndMT, which was confirmed by in vitro and in vivo studies. A specific fibroblast-like phenotype was more prevalent in lesion smooth muscle cells, hinting at the role of vessel reconstructions and repairs in CMs, and we also confirmed that TWIST1 could induce SMC phenotypic switching in vitro and in vivo. Our results provide novel insights into the pathomechanism decryption and further precise therapy of CMs.