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| 1 | Improvements of heat resistance and adhesive property of condensed poly-nuclear aromatic resin via epoxy resin modification显示文摘A bisphenol epoxy resin was used as modifier to increase the heat resistance of condensed poly-nuclear aromatic(COPNA) resin. The basic properties of COPNA resin and modified resin were characterized by Fourier transform infrared spectroscopy(FT-IR), nuclear magnetic resonance spectroscopy(1H-NMR), vapor pressure osmometry(VPO) and elemental analysis(EA). Average structural parameters of resins were calculated by the improved Brown-Ladner method, and heat resistance of resins was tested by thermogravimetric analysis(TGA). The chemical structure, mechanical properties and heat resistivity of the resin/graphite composites prepared with different resins were compared. The results show that the adhesive property and heat resistance of COPNA resin can be remarkably improved by addition of 5 wt.% epoxy resin. The reason is that the reactions between epoxy groups of epoxy resin and hydroxyl groups of COPNA resin improve the heat resistance and adhesive property of COPNA resin. Electric motor brushes with good mechanical properties and low electrical resistivity were successfully prepared by using the modified resin as binder. | Wu Mingbo Wang Yuwei Jiang Wei Li Shibin Sun Qiqian Zheng Jingtang Qiu Jieshan | 2014 | Petroleum Science2014，11，4： | 5 |
| 2 | Basic study of combustion-material removal process by uhi-function electrode显示文摘 | Liu Zhidong Xu An'yang Qiu Mingbo | 2013 | Procedia CIRP2013，6，： | 1 |
| 3 | Basic studyof combustion-material removal process by multi-functionelectrode显示文摘 | LIU Zhidong XU Anyang QIU Mingbo | 2013 | Procedia CIRP2013，6，： | 1 |
| 4 | Preparation of porous carbons from petroleum coke by different activation methods显示文摘 | Mingbo Wu Qingfang Zha Jieshan Qiu | 2005 | Fuel2005，84，1415： | 1 |
| 5 | MnO nanoparticles anchored on graphene nanosheets via in situ carbothermal reduction as high-performance anode materials for lithium-ion batteries显示文摘 | Qiu Danfeng Ma Luyao Zheng Mingbo | 2012 | Materials Let- ters2012，84，： | 1 |
| 6 | Multi-channel discharge characteristics cutting by ultra-fine wire-EDM显示文摘Compared with a copper wire electrode, molybdenum wire with a poor conductor is usually used as the electrode in high speed wire-cut electrical discharge machining(HSWEDM), so the resistance of an ultra-fine wire cannot be ignored. To study the differences of discharge characteristics between the ultra-fine wire and the conventional diameter wire, the continuous discharge waveform of two kinds of wire electrodes was compared. It was found that there was a multichannel discharge phenomenon in the discharge waveform cutting by ultra-fine wire. Through the establishment of a discharge equivalent circuit model and the simulation analysis of the electrostatic field, it was found that the reason why ultra-fine wire is easy to form multi-channel discharge phenomenon is that the potential difference between the wire and the workpiece increased linearly along the axis of the wire. Besides, etching products like metal particles will distort the electric field between the electrodes. Both of them make it easy to form a multi-channel discharge in machining.The results show that the distributions of the equivalent resistance and the peak current are affected by the multi-channel discharge position. Multi-channel discharge can disperse energy and increase effective discharge frequency. Compared with the 0 mm spacing, at a spacing of 100 mm, the machining efficiency increases by 8.7%, the surface roughness decreases by 37.7%, and the average recast layer thickness decreases by 46.6% under the condition of ultra-fine wire-EDM. | Ming ZHANG Zhidong LIU Hongwei PAN Cong DENG Mingbo QIU | 2022 | Chinese Journal of Aeronautics2022，35，2： | 1 |
| 7 | Preparation of porous carbons from petroleum coke by different activation methods显示文摘 | WU Mingbo ZHA Qingfang QIU Jieshan | 2005 | Fuel2005，84，1415： | 1 |
| 8 | Degradation of organic dye by pulsed discharge non-thermal plasma technology assisted with modified activated carbon fibers显示文摘 | Bo Jiang Jingtang Zheng Xiu Lu Qian Liu Mingbo Wu Zifeng Yan Shi Qiu Qingzhong Xue Zhenxing Wei Huiji Xiao Mengmeng Liu | 2012 | Chemical Engineering Journal2012，，： | 1 |
| 9 | Basic study of combustion-material removal process by multi-function electrode显示文摘 | Liu Zhidong Xu Anyang Qiu Mingbo | 2013 | Procedia CIRP2013，6，： | 1 |
| 10 | Effect of no-load rate on recast layer cutting by ultra fine wire-EDM显示文摘Via material erosion in wire electrical discharge machining(WEDM),recast layers form on the surfaces of workpiece.In addition,ultra fine Wire-EDM can be usually cut once.To reduce the thickness of the recast layer as much as possible,the wire electrical discharge-electrochemical machining(WEDCM)method was proposed,which is based on the micro conductivity of the dielectric and microelectrolytic characteristics by adjusting the no-load rate of the pulse in the machining process.Furthermore,a state discrimination and servo control system based on discharge current was designed.The experiment results of different no-load rates show that the electrolytic effects increase as the no-load rate increases,and the main machining process is spark discharge erosion with a no-load rate in the range of 10%to 80%.At 90%no-load rate,the amount of recast layer formation in the forward direction of the wire electrode is almost the same as that of electrolytic dissolution,and it can be practically processed without a recast layer.Compared with10%no-load rate,the kerf width only increases by 7.5%. | Ming ZHANG Zhidong LIU Hongwei PAN Cong DENG Mingbo QIU | 2021 | Chinese Journal of Aeronautics2021，34，4： | 1 |
| 11 | Study of unidirectional conductivity on the electrical discharge machining of semiconductor crystals 显示文摘 | QIU Mingbo LIU Zhidong TIAN Zongjun | 2013 | Precision Engi- neering2013，37，4： | 1 |
| 12 | Graphene anchored with mesoporous NiO nanoplates as anode material for lithium-ion batteries显示文摘 | Danfeng Qiu Zijing Xu Mingbo Zheng Bin Zhao Lijia Pan Lin Pu Yi Shi | 2012 | Journal of Solid State Electrochemistry2012，，5： | 1 |
| 13 | Simultaneously enhancing capacity and security in free-space optical chaotic communication utilizing orbital angular momentum显示文摘Optical chaotic signals emitted from an external-cavity feedback or injected laser diode enable small-signal information concealment in a noise-like carrier for secure optical communications.Due to the chaotic bandwidth limitation resulting from intrinsic relaxation oscillation frequency of lasers,multiplexing of optical chaotic signal,such as wavelength division multiplexing in fiber,is a typical candidate for high-capacity secure applications.However,to our best knowledge,the utilization of the spatial dimension of optical chaos for free-space secure communication has not yet been reported.Here,we experimentally demonstrate a free-space all-optical chaotic communication system that simultaneously enhances transmission capacity and security by orbital angular momentum(OAM)multiplexing.Optical chaotic signals with two different OAM modes totally carrying 20 Gbps on-off keying signals are secretly transmitted over a 2 m free-space link,where the channel crosstalk of OAM modes is less than-20 d B,with the mode spacing no less than 3.The receiver can extract valid information only when capturing approximately 92.5% of the OAM beam and correctly demodulating the corresponding mode.Bit error rate below the 7%hard-decision forward error correction threshold of 3.8×10^(-3)can be achieved for the intended recipient.Moreover,a simulated weak turbulence is introduced to comprehensively analyze the influence on the system performance,including channel crosstalk,chaotic synchronization,and transmission performance.Our work may inspire structured light application in optical chaos and pave a new way for developing future high-capacity free-space chaotic secure communication systems. | YIQUN ZHANG MINGFENG XU MINGBO PU MENGJIE ZHOU JIAZHENG DING SHUANGCHENG CHEN KUN QIU NING JIANG XIANGANG LUO | 2023 | Photonics Research2023，11，12： | 0 |
| 14 | Multi-view ladar data registration in obscure environment显示文摘Multi-view laser radar (ladar) data registration in obscure environments is an important research field of obscured target detection from air to ground. There are few overlap regions of the observational data in different views because of the occluder, so the multi-view data registration is rather difficult. Through indepth analyses of the typical methods and problems, it is obtained that the sequence registration is more appropriate, but needs to improve the registration accuracy. On this basis, a multi-view data registration algorithm based on aggregating the adjacent frames, which are already registered, is proposed. It increases the overlap region between the pending registration frames by aggregation and further improves the registration accuracy. The experiment results show that the proposed algorithm can effectively register the multi-view ladar data in the obscure environment, and it also has a greater robustness and a higher registration accuracy compared with the sequence registration under the condition of equivalent operating efficiency. | Mingbo Zhao Jun He Wei Qiu Qiang Fu | 2013 | Journal of Systems Engineering and Electronics2013，24，4： | 0 |
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