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| 1 | Effects of super-absorbent polymer on dry matter accumulation and nutrient uptake of Pinus pinaster container seedlings显示文摘 | Liu Fangchun Ma Hailin Xing Shangjun | 2013 | Journal of Forest Research2013，18，： | 1 |
| 2 | Inhibitory effect of parvovirus H-1 on the formation of colonies of human hepatoma cell line in vitro and its tumors in nude mice显示文摘The inhibitory effect of parvovirus H-1 on the colonyforming ability in vitro of QGY-7703, a cultured human hepatoma cell line, and on the formation and growth of its tumors in nude mice was studied. With higher multiplicity of infection (MOI) of H-1 given, survival of the QGY-7703 cells was found to be decreased. H-1 DNA amplification level at 30 h postinfection(p.i.) was detected to be 7.4 times higher than that at 2 h by dispersed cells assay, while the cells were delayed to enter into S phase.Plaques were formed in the indicator cells (new-born human kidney cell line, NBK) by progeny H-1 virus particles released from the infected QGY-7703 cells by infectious cell center assay. The formation of tumors in nude mice by QGY-7703 cells which were injected s c at 2 h postinfection was observed to be prevented in 2 groups with given MOI 25 and 50. The tumor growth of MOI 10 group occurred at a lower exponential rate than that of control,after a 20 d latent period. It was evident that parvovirus H-1 exhibited a direct inhibitory effect on the formation and growth of human hepatoma cells in vivo as well as in vitro. | YAN SHANGJUN CHENGWU MA XIANHUA CHEN SHANHONG WAN ZUYU LUO(Physiology and Biophysics Department, Fudan University,Shanghai 200433, China) | 1994 | Cell Research1994，4，1： | 1 |
| 3 | Optimal Design and Con-tact Analysis for Planetary Roller Screw显示文摘 | Ma Shangjun Liu Geng Zhou Jianxing | 2011 | AppliedMechanics andMate-rials2011，86，： | 1 |
| 4 | A Frictional Heat Model of Planetary Roller Screw Mechanism Considering Load Distribution显示文摘 | MA Shangjun LIU Geng TONG Ruiting | 2015 | Mechanics Based Design of Structures and Machines2015，43，： | 1 |
| 5 | Optimal Design and Contact Analysis for Planetary Roller Screw 显示文摘 | Ma Shangjun Liu Geng Zhou Jianxing | 2011 | Applied Mechanics and Materials2011，86，： | 1 |
| 6 | Design and Dynamic Analysis of the Recirculating Planetary Roller Screw Mechanism显示文摘The recirculating planetary roller screw mechanism(RPRSM)is a transmission mechanism that engages the screw and nut threaded by multiple grooved rollers.In this paper,frstly,the design method of RPRSM nut threadless area is proposed,and the equations related to the structural parameters of nut threadless area are derived.On this basis,the cross-section design method of roller,screw and nut is constructed according to the actual situation of engagements between the screw/nut and the roller.By adjusting the gap between the two beveled edges and that between the arc and the beveled edge,the accuracy of the thread engagements between the screw/nut and the roller can be improved.Secondly,to ensure the engagements of the screw/nut and the roller,the distance equation from the center surface of the diferent rollers to the end surface of cam ring is given.Thirdly,combined with the working principle and structural composition of RPRSM,the component model is established according to its relevant structural parameters,and the virtual assembly is completed.Finally,the 3D model is imported into the ADAMS simulation software for multi-rigid body dynamics.The dynamic characteristic is analyzed,and the simulated values are compared with the theoretical values.The results show that the contact forces between the screw/nut and the roller are sinusoidal,mainly due to the existence of a small gap between the roller and the carrier.The maximum collision forces between the roller and cam ring are independent from load magnitude.Normally,the collision force between the roller and the carrier increases as the load increases.When RPRSM is in the transmission process,the roller angular speed in nut threadless area begins to appear abruptly,and the position of the maximum change is at the contact between the roller and the convex platform of cam ring.The design of the nut threadless area and the proposed virtual assembly method can provide a theoretical guidance for RPRSM research,as well as a reference for overall performance optimization. | Guan Qiao Rong Liao Shijie Guo Zhenghong Shi Shangjun Ma | 2022 | Chinese Journal of Mechanical Engineering2022，35，4： | 0 |
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