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Synthesis and Application of a Light-sensitive Polymer Forming Aqueous Two-phase Systems
Kong FanQi,Cao Xuejun,Xia Jinan,허병기 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.3
Abstract:A visible light-sensitive polymer that forms aqueous two-phase systems has been synthesized by using N-isopropylacrylamide, n-butyl acrylate, and chlorophyllin sodium copper salt as monomers, and its capability to form aqueous two-phase system was investigated. The polymer formed aqueous two-phase systems with Dextran20000. Over 98 % of the polymer could be recovered by using light radiation at 488 nm. The recovery experiments were repeated five times. The recoveries were maintained fairly stable. The polymer could be recovered at more than 95 % by using thermo separation. Trypsin constantly maintained a relatively high activity and stability in the aqueous two-phase systems.
A Digitized Decoupled Dual-axis Micro Dynamically Tuned Gyroscope with Three Equilibrium Rings
Xia, Dunzhu,Ni, Peizhen,Kong, Lun The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
A new digitized decoupled dual-axis micro dynamically tuned gyroscope with three equilibrium rings (TMDTG) is proposed which can eliminate the constant torque disturbance (CTD) caused by the double rotation frequency of a driving shaft with a micro dynamically tuned gyroscope with one equilibrium ring (MDTG). A mechanical and kinematic model of the TMDTG is theoretically analyzed and the structure parameters are optimized in ANSYS to demonstrate reliability. By adjusting the thickness of each equilibrium ring, the CTD can be eliminated. The digitized model of the TMDTG system is then simulated and examined using MATLAB. Finally, a digitized prototype based on FPGA is created. The gyroscope can be dynamically tuned by adjusting feedback voltage. Experimental results show the TMDTG has good performance with a scale factor of $283LSB/^{\circ}/s$ in X-axis and $220LSB/^{\circ}/s$ in Y-axis, respectively. The scale factor non-linearity is 0.09% in X-axis and 0.13% in Y-axis. Results from analytical models, simulations, and experiments demonstrate the feasibility of the proposed TMDTG.
Simple Synthesis of Multi-Halogen Pyrazino[1,2-a]indole-1,8(2H,5aH)-diones
Rui-Xia Yang,Yu-Cheng Zhao,Ling-Bin Kong,Sheng-jiao Yan,Jun Lin 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.10
A concise and efficient one-pot synthesis of multi-halogen pyrazino[1,2-a]indole-1,8(2H,5aH)-dione (MHPID) derivatives by the reaction of an enamino ester with multi-halogen benzoquinone derivatives is described. MHPIDs 3a–3d were obtained with good yields (78–83%) by refluxing enamino esters 1a and 1b and tetrahalogen-1,4-benzoquinones 2a and 2b for 24 h without the use of catalysts. Compounds 3e–3p were also obtained with excellent yields (69–92%) via the reaction of the phenyl-substituted enamino esters 1c–1h with tetrahalogen-1,4-benzoquinones 2a and 2b in CH3CN catalyzed by Cs2CO3. These two protocols are efficient and effective for the synthesis of MHPIDs.
Xue, Xia,Yu, Jin-Long,Sun, De-Qing,Kong, Feng,Qu, Xian-Jun,Zou, Wen,Wu, Jing,Wang, Rong-Mei Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.9
Curcumin, a polyphenol compound derived from the rhizome of the plant Curcuma longa L. has been verified as an anticancer compound against several types of cancer. However, understanding of the molecular mechanisms by which it induces apoptosis is limited. In this study, the anticancer efficacy of curcumin was investigated in human gastric adenocarcinoma SGC-7901 cells. The results demonstrated that curcumin induced morphological changes and decreased cell viability. Apoptosis triggered by curcumin was visualized using Annexin V-FITC/7-AAD staining. Curcumin-induced apoptosis of SGC-7901 cells was associated with the dissipation of mitochondrial membrane potential (MMP) and the release of cytochrome c into the cytosol. Furthermore, the down-regulation of Bcl-2 and up-regulation of Bax that led to the cleavage of caspase-3 and increased cleaved PARP was observed in SGC-7901 cells treated with curcumin. Therefore, curcumin-induced apoptosis of SGC-7901 cells might be mediated through the mitochondria pathway, which gives the rationale for in vivo studies on the utilization of curcumin as a potential cancer therapeutic compound.
Xiangjie Kong,Guojiang Shen,Feng Xia,Chuang Lin 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.1
This paper presents a new two-direction green wave intelligent control strategy to solve the coordina-tion control problem of urban arterial traffic. The whole control structure includes two layers - the coordination layer and the control layer. Public cycle time, splits, inbound offset and outbound offset are calculated in the coordination layer. Public cycle time is adjusted by fuzzy neural networks (FNN) according to the traffic flow saturation degree of the key intersection. Splits are calculated based on historical and real-time traffic information. Offsets are calculated by the real-time average speeds. The control layer determines phase composition and adjusts splits at the end of each cycle. The target of this control strategy is to maximize the possibility for vehicles in each direction along the arterial road to pass the local intersection without stop while the utility efficiency of the green signal time is at relatively high level. The actual application results show the proposed method can decrease the average travel time and average number of stops, and increase the average travel speed for vehicles on the arterial road effectively.
A Digitized Decoupled Dual-axis Micro Dynamically Tuned Gyroscope with Three Equilibrium Rings
Dunzhu Xia,Peizhen Ni,Lun Kong 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
A new digitized decoupled dual-axis micro dynamically tuned gyroscope with three equilibrium rings (TMDTG) is proposed which can eliminate the constant torque disturbance (CTD) caused by the double rotation frequency of a driving shaft with a micro dynamically tuned gyroscope with one equilibrium ring (MDTG). A mechanical and kinematic model of the TMDTG is theoretically analyzed and the structure parameters are optimized in ANSYS to demonstrate reliability. By adjusting the thickness of each equilibrium ring, the CTD can be eliminated. The digitized model of the TMDTG system is then simulated and examined using MATLAB. Finally, a digitized prototype based on FPGA is created. The gyroscope can be dynamically tuned by adjusting feedback voltage. Experimental results show the TMDTG has good performance with a scale factor of 283 LSB/o/s in X-axis and 220 LSB/o/s in Y-axis, respectively. The scale factor non-linearity is 0.09% in X-axis and 0.13% in Y-axis. Results from analytical models, simulations, and experiments demonstrate the feasibility of the proposed TMDTG.
Pulse Compression by Difference-Frequency Generation with Engineered Aperiodic Optical Superlattic
Y. Kong,Xianfeng Chen,P. Li,Y. Xia 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.II
We theoretically propose a procedure for designing quasi-phase-matching (QPM) gratings for compressing ultrashort optical pulses during difference-frequency generation. The grating consists of blocks of crystal with the same block length and the direction of spontaneous polarization of each block is determined by an optimal algorithm through which the sign of the nonlinear coefficient of each block is optimized to make the phase response of the grating the same for different wavelengths of the output idler waves so that the generated idler pulse from the end of the crystal will be compressed during difference-frequency generation. Pumped by a cw (or a quasi-cw) laser, the generated idler pulse is compressed beyond its Fourier-transform limit in the simulations
Novel high‑power triple line‑voltage cascaded unity power factor rectifier
Cong Wang,Xia Liu,Zhuang Li,Hong Cheng,Ting Chen,Jiayi Kong 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.1
A novel high-power triple line-voltage cascaded three-phase unity power factor rectifier is proposed to address the complex topology and control of the three-phase rectifier stage in traditional high-power charging power supply modules. The topology is composed of three line-voltage cascaded traditional three-phase single-switch boost-type voltage rectifier modules. With the triple line-voltage cascaded structure, in the proposed topology, the number of the fully controlled power switches and the voltage stresses of each power switch are both effectively reduced. In addition, the proposed rectifier topology can operate at a unity power factor with a sinusoidal input current. In this paper, the circuit structure and the operation principle including the DC-link voltages output characteristics of the proposed topology are described, and a corresponding system control strategy based on one cycle control (OCC) is presented. Simulation and experimental results are given which verified the feasibility of the proposed topology and control strategy.