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| 1 | Design study for the cascaded HGHG experiment based on the SDUV-FEL显示文摘Cascading stages of high-gain harmonic generation(HGHG) free electron laser(FEL) is a promising way to produce fully coherent X-ray radiation.As a test facility for modern FEL R&D,the Shanghai deep ultraviolet FEL(SDUV-FEL) is now under upgrading for the cascading two stages of HGHG experiment.Since the energy of the electron beam is as low as about 185 MeV after upgrade,the total harmonic number of this two stages HGHG is only 2×2,and the wavelength of the final radiation is 196.5 nm which is the 4th harmonic of the 786 nm seed laser.With help of three-dimensional simulation codes,design studies on the FEL physics for the cascaded HGHG experiment are present based on the parameters of the upgraded SDUV-FEL facility.It is found from the simulation results that the part of the electron beam which has been used in the first stage can still generate powerful radiation in the radiator of the second stage,and this radiation will be difficult to be separated from the radiation generated by the fresh part of the electron beam.To overcome this problem,a novel method based on the energy spectrum of the electron beam is proposed in this paper to demonstrate the 'fresh bunch' technique. | FENG Chao ZHANG Meng LIN GuoQiang GU Qiang DENG HaiXiao CHEN JianHui WANG Dong ZHAO ZhenTang | 2012 | Chinese Science Bulletin2012，57，26： | 2 |
| 2 | Control Mechanism of Surface Subsidence and Overburden Movement in Backfilling Mining based on Laminated Plate Theory显示文摘The backfilling mining technology is a type of high-efficiency coal mining technology that is used to address the environmental issues caused by the caving mining technology.In this paper,the mechanical model of symmetrical laminated plate representing the overburden movement caused by the backfilling mining technology is established,and the governing differential equation of the motion of the overburden is derived.The boundary conditions of the mechanical model are put forward,and the analytical solution of the overburden movement and surface subsidence is obtained.The numerical model of the overburden movement and surface subsidence,under mining with backfilling,is established by means of the FLAC3D numerical software,which aims to systematically study the influence of backfilling compactness,mining thickness,and mining depth on the overburden movement and surface subsidence in backfilling mining.When the compactnessηis less than 70%,the overburden movement and surface subsidence is greater,while whenηis greater than 70%,the overburden movement and surface subsidence is reduced significantly.On this basis,the control mechanism of surface subsidence and overburden movement in backfilling mining is obtained.The suitable backfilling compactness is the key to controlling surface subsidence and overburden movement in backfilling mining. | Zhengzheng Cao Feng Du Ping Xu Haixiao Lin Yi Xue Yuejin Zhou | 2017 | Computers, Materials & Continua2017，，3： | 2 |
| 3 | Velocity bunching for the linac of Shanghai Deep UV FEL facility显示文摘High brightness electron beam is one of the main goals of the research and development effort in RF photo-injectors.Compared with the normally used magnetic chicane,an alternative scheme,commonly known as 'velocity bunching',has been proposed as a tool to compress electron beam pulses in modern high brightness photo-injector sources.This paper presents numerical optimization systematically and the first attempt to demonstrate the velocity bunching scheme on SDUV-FEL linac experimentally.The relationship between the degree of bunching and the off-crest phase of the accelerating structure is explored experimentally.Velocity bunching operating mode illustrates flexible performances with an intrinsic machine jitter,which agrees well with the theoretical prediction. | ZHANG Meng GU Duan GU Qiang LIN Guoqiang LAN Taihe WANG Xingtao DENG Haixiao | 2012 | Nuclear Science and Techniques2012，23，3： | 1 |
| 4 | Recent progress in two-photon small molecule fluorescent probes for enzymes显示文摘Enzymes are macromolecular biological catalysts which can accelerate chemical reactions in living organisms. Almost all the physiological metabolism activities in the cell need enzymes to sustain life via rapid catalysis. Currently, medical research has proved that abnormal enzyme activity is associated with numerous diseases, such as Parkinson’s disease(PD), Alzheimer’s disease(AD) and cancers. On the other hand, early diagnosis of those diseases is of great significance to improve the survival rate and cure rate.In the current diagnostic tools, two-photon fluorescent probes(TPFPs) are developing rapidly due to their unique advantages, such as higher spatial resolution, deeper imaging depth, and lower biotoxicity.Therefore, the design and synthesis of two-photon(TP) small molecule enzymatic probes have broad prospects for early diagnosis and treatment of diseases. As of now, scientists have developed many TP small molecule enzymatic probes. This review aims to summarize the TP small molecule enzymatic probes and expound the reaction mechanism. | Ding Chen Wenjing Qin Haixiao Fang Lan Wang Bo Peng Lin Li Wei Huang | 2019 | Chinese Chemical Letters2019，30，10： | 1 |
| 5 | Modeling the pullout behavior of fiber reinforced polymer bars from concrete显示文摘 | Xu Chang Gaowei Yue Haixiao Lin Chunan Tang | 2009 | Construction and Building Materials2009，，4： | 1 |
| 6 | Modeling the pullout behavior of fiber reinforced polymer bars from concrete显示文摘 | Xu Chang Gaowei Yue Haixiao Lin Chunan Tang | 2010 | Construction and Building Materials2010，24，4： | 1 |
| 7 | Experimental study on shear resistance of self-stressing concrete filled circular steel tubes 显示文摘 | Chang Xu Lin Haixiao Huang Chengkui | 2009 | Journal of Constructional Steel Research2009，65，4： | 1 |
| 8 | Research on Instability Mechanism and Type of Ore Pillar Based on the Fold Catastrophe Theory显示文摘The stability of ore pillar in mine is essential for the safe and efficient mining.Based on the energy evolvement rule in ore pillar and roadway roof system,the roadway roof and ore pillar are treated as energy release body and energy dissipation body,respectively.Therefore,the double-block mechanical model is established with energy dissipation body and energy release body,and the energy mechanism of ore pillar instability is obtained,based on the fold catastrophe mathematical theory.The research result indicates that the dynamic instability of ore pillar is a physical instability problem caused by the strain softening property of ore mass,and the instability type of ore pillar is determined by the stiffness parameter of double-block mechanical system.When the systematical stiffness parameter is greater than or equal to 1,the equilibrium position of double-block mechanical system passes through shaft K-1 or the origin,from branch 1 of unstable equilibrium state to branch 2 of stable equilibrium state by smooth transition,and the ore pillar shows quasi-static fracture.When the systematical stiffness parameter is less than 1,the equilibrium position of double-block system mutates from branch 1 of unstable equilibrium state to branch 2 of stable equilibrium state by jumping transition,and the ore pillar shows dynamic instability.The research result could provide theoretical guidance for the prevention measures of ore pillar instability. | Zhengzheng Cao Feng Du Zhenhua Li Qinting Wang Ping Xu Haixiao Lin | 2017 | Computer Modeling in Engineering & Sciences2017，，3： | 0 |
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