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Experimental investigation of combustion mechanisms of kerosene-fueled scramjet engines with double-cavity flameholders

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Acta Mechanica Sinica 2011年第6期27卷 891-897页

作者： Yu Pan Jian-guo Tan Jian-Han Liang Wei-Dong liu zhen-guo Wang Department of Aerospace and Material National University of Defense and Technology 410073 Changsha China

A scramjet combustor with double cavitybased flameholders was experimentally studied in a directconnected test bed with the inflow conditions of M = 2.64,Pt = 1.84 MPa,Tt = 1 300 *** ignition and selfsustained combustion with room temperature kerosene was achieved using pilot hydrogen,and kerosene was vertically injected into the combustor through 4×φ 0.5 mm holes mounted on the *** different equivalence ratios and different injection schemes with both tandem cavities and parallel cavities,flow fields were obtained and compared using a high speed camera and a Schlieren *** revealed that the combustor inside the flow field was greatly influenced by the cavity installation scheme,cavities in tandem easily to form a single side flame distribution,and cavities in parallel are more likely to form a joint flame,forming a choked combustion *** supersonic combustion flame was a kind of diffusion flame and there were two kinds of combustion *** the unchoked combustion mode,both subsonic and supersonic combustion regions *** in the choked mode,the combustion region was fully subsonic with strong shock propagating *** also showed that there was a balance point between the boundary separation and shock enhanced combustion,depending on the intensity of heat release.

关键词： Scramjet. Supersonic combustion. Flame structure Cavity flameholder

Development of Ti-Microalloyed 600 MPa Hot Rolled High Strength Steel

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Journal of Iron and Steel Research International 2010年第12期17卷 54-58,64页

作者： YI Hai-long liu zhen-yu WANG guo-dong WU Di State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

A high strength steel with yield strength on the order of 600 MPa was developed successfully with only addition of titanium alloying element based on a low-carbon steel. The results showed that the hot deformation accelerated ferrite and pearlite transformation and retarded bainite transformation under continuous cooling condition. The microstructure of this steel was mainly composed of fine grained ferrite and carbides distributing along the ferrite grain boundaries. The yield and tensile strengths of steels were about 620--650 MPa and 720--740 MPa, respectively, and the values of strain hardening exponent and plastic strain ratio were 0.12 and 0.80, respectively, thereby providing a good combination of strength with toughness. In short, the fine grained ferrite and TiC precipitation strengthening contributed to a high strength.

关键词： hot rolled high strength steel TMCP (thermomechanical control process) precipitate carbide

Advances in space-borne SAR interferometry and its application to ground deformation monitoring

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Journal of Coal Science & Engineering(China) 2011年第2期17卷 163-170页

作者： liu zhen-guo BIAN zheng-fu Jiangsu Key Laboratory of Resources and Environmental Information Engineering Xuzhou 221116 China School of Environment Science ＆ Spatial Informatics China University of Mining and Technology Xuzhou 221116 China

The development of Differential Synthetic Aperture Radar Interferometry （D-InSAR）, in terms of its evolution from classic to advanced forms, such as Least-Squares approach, Permanent Scatterer Interferometry, Small Baseline Subset, and Coherent Pixel Technique, is reviewed, describing concisely the main principles of each method and highlighting the difference and relationship between them. Applications of InSAR technology in China were then introduced, together with the obstacles to overcome and feasible strategies, such as integrating MERIS/MODIS data to compensate for the atmospheric effect and GPS, and multi-platform SAR data to make InSAR technique practical and operational under various conditions. The latest devel- opments were then analyzed along with high-quality SAR data, available thanks to the newly launched high-tech satellites, TerraSAR-X, and Cosmo Sky-med, and conclusions were drawn about the main limitations of the technique.

关键词： InSAR ground deformation permanent scatterer mining subsidence

The expression and binding properties of the rice WRKY68 protein in the Xa21-mediated resistance response to Xanthomonas oryzae pv. Oryzae

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Journal of Integrative Agriculture 2016年第11期15卷 2451-2460页

作者： YANG Shuo ZHOU Liang MIAO liu-yang SHI Jia-nan SUN Cai-qiang FAN Wei LAN Jin-ping CHEN Hao liu Li-juan DOU Shi-juan liu guo-zhen LI Li-yun College of Life Sciences Hebei Agricultural University Baoding 071001 P.R. China Quantum Design China Beijing 100027 P.R.China Beijing Protein Innovation Co. Ltd. Beijing 101318 P.R.China

Plant WRKY transcription factors are involved in various physiological processes, including biotic and abiotic stress responses, as well as developmental processes. In this study, the expression patterns of the WRKY68 protein during interactions between rice 4021 containing the bacterial blight resistance gene Xa21 and Xanthomonas oryzae pv. oryzae（Xoo） were investigated. A possible modified form of the WRKY68 protein appeared in the Xa21-mediated disease resistance response, and its expression levels were similar in compatible and incompatible responses, but differed significantly from that of the mock control treatment, suggesting that WRKY68 may be involved in the bacterial blight response in rice. To further understand WRKY68＇s roles in the resistance signaling pathway, WRKY68 recombinant protein was expressed in Escherichia coli and a microscale thermophoresis analysis was performed to investigate the interactions between WRKY68 and cis-elements in crucial pathogenesis-related（PR） genes. The results showed that the WRKY68 protein binds to W-boxes in the PR1 b promoter region, with an apparent dissociation constant of 25 nmol L–1, while the binding between WRKY68 and PR10 a was W-box independent. The results suggested that a possible modified form of the WRKY68 protein was induced during the interaction between rice and Xoo, which then regulated the activity of the downstream PR genes by binding with the W-boxes in the PR1 b gene＇s promoter region. Moreover, the constitutive transcription of the WRKY68 gene in dozens of rice tissues and the expression of the WRKY68 protein in leaves during all growth stages suggests that WRKY68 plays important roles in rice during normal growth processes.

关键词： rice bacterial blight WRKY transcription factor W-box Western blot microscale thermophoresis

Means and verification of broadcast technology applied to laser transmission on horizontal link

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Optoelectronics Letters 2019年第4期15卷 277-283页

作者： MU Yi-ning WANG Shuai liu guo-zhen liu Chun-yang ZHAO Kai-qiang JIANG Hui-lin ZHU Yan School of Science Changchun University of Science and Technology Changchun 130022 China Space Opto-electronics Institute Changchun University of Science and Technology Changchun 130022 China

At present, there has been great progress in the field of the point-to-point laser communication technology, in other words, the traditional laser communication technology has been advanced day by day. Furthermore, in order to search for an effective means of achieving localized laser broadcasting communication within a limited range, an effective method of horizontal link laser broadcasting communication is presented, and the corresponding verifiable broadcast communication system is designed. In addition, the laser broadcasting is systematically studied by one physical model built at the optimal distribution of optical power. First of all, the theoretical model of laser beam expansion and the theoretical model of parallel light curtain are made comparisons and analyzed from the angle of attenuation of optical power, and the optical power loss model of the parallel light curtain is established as a result. Secondly, combined with the theory of optical imaging transformation based on Gaussian beam, the field distribution of far field of parallel light curtain is simulated by one leading optical and illumination design software and the relation between the filed distribution of far field of light curtain and the distance of transmission is revealed. Finally, the superiority and feasibility of the parallel light curtain theory model are verified by field communication experiments in different information channels.

关键词： broadcast technology applied laser transmission point-to-point laser communication technology

Boosting cationic and anionic redox activity of Li-rich layered oxide cathodes via Li/Ni disordered regulation

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Journal of Energy Chemistry 2025年第1期100卷 533-543页

作者： Zewen liu zhen Wu Hao Wang Xudong Zhang Yuanzhen Chen Yongning liu Shengwu guo Shenghua Chen Yanli Nan Yan liu State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University School of Materials Science and Engineering Xi'an University of Architecture and Technology Hefei Advanced Computing Center Operation Management Corp Ltd Network Information Center Xi'an Jiaotong University

Lithium-rich layered oxides （LLOs） are increasingly recognized as promising cathode materials for nextgeneration high-energy-density lithium-ion batteries （LIBs）.However,they suffer from voltage decay and low initial Coulombic efficiency （ICE） due to severe structural degradation caused by irreversible O ***,we introduce a three-in-one strategy of increasing Ni and Mn content,along with Li/Ni disordering and TM–O covalency regulation to boost cationic and anionic redox activity simultaneously and thus enhance the electrochemical activity of *** target material,Li1.2Ni0.168Mn0.558Co0.074O2（L1）,exhibits an improved ICE of 87.2%and specific capacity of 293.2 mA h g-1and minimal voltage decay of less than 0.53 m V cycle-1over 300 cycles at 1C,compared to Li1.2Ni0.13Mn0.54Co0.13O2（Ls）(274.4 mA h g-1for initial capacity,73.8%for ICE and voltage decay of 0.84 mV/cycle over 300 cycles at 1C).Theoretical calculations reveal that the density of states （DOS） area near the Fermi energy level for L1 is larger than that of Ls,indicating higher anionic and cationic redox reactivity than ***,L1 exhibits increased O-vacancy formation energy due to higher Li/Ni disordering of 4.76%（quantified by X-ray diffraction Rietveld refinement） and enhanced TM–O covalency,making lattice O release more difficult and thus improving electrochemical *** increased Li/Ni disordering also leads to more Ni2+presence in the Li layer,which acts as a pillar during Li+de-embedding,improving structural *** research not only presents a viable approach to designing low-Co LLOs with enhanced capacity and ICE but also contributes significantly to the fundamental understanding of structural regulation in high-performance LIB cathodes.

关键词： Ice

Changes of glucocorticoid receptor mRNA expression in basolateral amygdale-kindled rats

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Chinese Medical Journal 2011年第17期124卷 2622-2627页

作者： BAO Guan-shui CHENG Xu-qin HUA Yin WANG Zhe-dong liu zhen-guo Department of Neurology No.3 People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 201900 China Department of Neurology Affiliated Children's Hospital of Soochow University Suzhou Jiangsu 215003 China Department of Child Neurology Wuxi People's Hospital Wuxi Jiangsu 214001 China Department of Neurology Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200092 China

Background Glucocorticoid receptor （GR） is believed to be a major factor in brain maturation and in modulation of a series of brain activity. Hippocampal neurons are abundant in glucocorticoid receptor, and there is significant change in GR expression under certain pathological state. Epilepsy is a special pathological state of the central nervous system. This study aimed to explore the role of GR in epilepsy by observing the change and functions of GR in hippocampus with a basolateral amygdale-electrical kindled rat epilepsy model. Methods Firstly, we established the basolateral amygdale-electrical kindled rat epilepsy model. Then GR mRNA expression in the hippocampus was assayed by semi-quantitative reverse transcription-PCR in this experiment. In addition, the processes of epileptic seizures were observed and electroencephalograms were recorded. One-way analysis of variance （ANOVA） was employed for comparing means of multiple groups, followed Fisher＇s least significant difference （LSD） for paired comparison. Results The rats were successfully kindled after an average of （13.50＋3.99） times electrical stimulation, in which it was showed that GR mRNA expression reduced obviously as compared with the control group and the sham groups （P 〈0.001）. The down-regulation of GR mRNA expression was abated or reversed by some anti-epilepsy drugs （P 〈0.001 compared with the epilepsy group）, accompanied by attenuation of seizures and improvement of electroencephalograms. Conclusions Down-regulation of hippocampal GR mRNA expression may be related to the kindling. Anti-epilepsy drugs exposure can retard this change.

关键词： epilepsy kindling basolateral amygdala glucocorticoid receptor anti-epilepsy drugs

Western blot detection of PMI protein in transgenic rice

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Journal of Integrative Agriculture 2016年第4期15卷 726-734页

作者： RONG Rui-juan WU Peng-cheng LAN Jin-ping WEI Han-fu WEI Jian CHEN Hao SHI Jia-nan HAO Yu-jie liu Li-juan DOU Shi-juan LI Li-yun WU Lin liu Si-qi YIN Chang-cheng liu guo-zhen College of Life Sciences Hebei Agricultural University Baoding 071001 P.R. China Beijing Protein Innovation Co. Ltd. Beijing 101318 P.R.China Beijing Institute of Genomics Chinese Academy of Sciences Beijing 100101 P.R. China

Phosphomannose isomerase （PMI） encoding gene manA is a desirable selective marker in transgenic research. Under- standing of its expression patterns in transgenic plant and establishing highly sensitive detection method based on immunoassay have great impacts on the application of PMI. In this study, PMI-specific monoclonal antibodies were generated using recombinant protein as immunogen, and could be used in Western blot to detect as little as 0.5 ng His-tagged PMI protein or rice expressed PMI protein in sample accounted for 0.4% of single rice grain （about 0.08 mg）. PMI protein driven by CaMV-35S promoter was detected in dozens of tested tissues, including root, stem, leaf, panicle, and seed at all developmental stages during rice growing, and PMI protein accounted for about 0.036% of total protein in the leaves at seedling stage. The established method potentially can be used to monitor PMI protein in rice grains.

关键词： transgenic rice protein expression CaMV-35S promoter phosphomannose isomerase (PMI) Western blot

组件多工作模式下的离散事件系统监督控制方法研究

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控制理论与应用 2020年第3期37卷 534-539页

作者：焦亭刘振国山西大学自动化系山西太原030006

针对组件多工作模式下的离散事件系统,提出一种监督控制方法.利用Ramadge-Wonham监督控制架构,计算出组件各工作模式下对应的监督控制器.然后,利用所提的merge算法将组件各工作模式下对应的监督控制器合并,以生成融合监督控制器.再利用... 详细信息

针对组件多工作模式下的离散事件系统,提出一种监督控制方法.利用Ramadge-Wonham监督控制架构,计算出组件各工作模式下对应的监督控制器.然后,利用所提的merge算法将组件各工作模式下对应的监督控制器合并,以生成融合监督控制器.再利用所提的事件选择函数得到在融合监督控制器各状态允许发生的事件,从而保证系统在融合监督控制器作用下的可控且非阻塞运行.最后,通过一个带反馈功能的制造系统演示本文所提方法的有效性,该系统中的检测单元将根据工件未通过检测的次数选择工作模式.相比于运用扩展有限状态机进行变量抽象的方法,本文所提方法更加直观简便,并能适应多个工件同时处于系统中时的情形.

关键词：离散事件系统监督控制理论多工作模式组件融合监督控制器