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| 1 | Surface integrity of GH4169 affected by cantilever finish grinding and the application in aero-engine blades显示文摘GH4169 is the main material for aero-engine blades and integrated blisks. Because GH4169 has a poor milling performance, the profile precision and surface integrity of blades and integrated blisks are difficult to be met by utilizing the conventional milling process, which directly influence the global performance and reliability of aero-engines. Through grinding experiments on parameters and surface integrity optimization, the helical cantilever grinding process utilizing a300# CBN RB wheel is presented and applied in finish machining of GH4169 blades. The profile errors of the blade surface are within ±0.01 mm, the roughness is less than 0.4 lm, the residual compressive stresses and the hardening rate are appropriate, there are no phenomena of burr and smearing with the grinding chips, and the leading/trailing edge can be smoothly connected with the suction/pressure surface. All the experimental results indicate that this grinding process is greatly suitable for the profile finish machining of GH4169 blades. | Li Xun Ma Shuang Meng Fanjun | 2015 | Chinese Journal of Aeronautics2015，28，5： | 9 |
| 2 | Surface nanostructure formation mechanism of 45 steel induced by supersonic fine particles pombarding显示文摘By means of supersonic fine particles bombarding (SFPB),a nanostructured surface layer up to 15 μm was fabricated on a 45 steel plate with ferrite and pearlite phases. To reveal the grain refinement mechanism of SFPB-treated 45 steel,microstructure features of various sections in the treated surface were systematically characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Grain size increases with an increase of depth from the treated surface. Plastic deformation and grain refinement processes are accompanied by an increase in strain. Plastic deformation in the proeutectoid ferrite phases has precedence over the pearlite phases. Grain refinement in the ferrite phases involves: the onset of dis-location lines (Dls),dislocation tangles (DTs) and dense dislocation walls (DDWs) in the original grains; the formation of fine la-mellar and roughly equiaxed cells separated by DDWs; by dislocation annihilation and rearrangement,the transformation of DDWS into subboundaries and boundaries and the formation of submicron grains or subgrains; the successive subdivision of grains to finer and finer scale,resulting in the formation of highly misoriented nano-grains. By contrast,eutectoid cementite phase accommodated strain in a sequence as follows: onset of elongated,bended and shear deformation under deformation stress of ferrites,short and thin cementites with a width of about 20-50 nm and discontinuous length were formed. Shorter and thinner cementites were developed into ultra-fine pieces under the action of high density dislocation and strains. At the top surface,some cementites were decomposed under severe plastic deformation. Experimental evidences and analysis indicate that surface nanocrystallization of 45 steel results from dislocation activities,high strains and high strain rate are necessary for the formation of nanocrystallites. | Dema Ba Shining Ma Changqing Li Fanjun Meng | 2008 | Journal of University of Science and Technology Beijing2008，15，5： | 3 |
| 3 | Effect of NaOH Treatment on Catalytic Performance of ZSM -5 in Cyclohexene Hydration显示文摘ZSM-5 zeolite prepared by a hydrothermal method with the addition of seeds was treated with different concentrations of NaOH.The obtained samples were characterized by XRD,N_2 adsorption,NH_3-TPD,FT-IR,SEM,and studied in the catalytic performance of the hydration of cyclohexene to cyclohexanol.The characterization results showed that with the increase of NaOH concentration,the crystallinity of the treated samples decreased monotonously,and the acid sites of ZSM-5 zeolites first increased and then decreased,while more mesopores formed inside the ZSM-5zeolites.The experimental results of catalytic performance showed that cyclohexene conversion can be improved through introducing the mesopores and enhancing the acidity of ZSM-5 with the NaOH treatment at a low concentration.The highest cyclohexene conversion of 12.8%was obtained when the concentrations of NaOH solution were in the range of 0.2-0.6 mol/L.The selectivity of cyclohexanol on all samples was higher than 99.6%. | Yaquan Wang Shougui Wang Fanjun Meng Shuhai Wang Jiaxin Ye Yongjie Lin | 2017 | Transactions of Tianjin University2017，23，1： | 1 |
| 4 | The remanufacturing system based on robot MAG surfacing显示文摘 | ZHU Sheng MENG Fanjun BA Dema | 2008 | Key Engineering Materials2008，，： | 1 |
| 5 | Fussy synthetical evaluation of weld bead stability for pulse MAG welding prototyping显示文摘 | MENG Fanjun ZHU Sheng BA Dema | 2011 | Advanced Materials Research2011，，： | 1 |
| 6 | The remanufacturing system based on robot MAG surfacing 显示文摘 | ZHU Sheng MENG Fanjun BA Dema | 2008 | Key Engineering Materials2008，，： | 1 |
| 7 | 中国法思想史研究的应有之义显示文摘通过反思中国法思想研究中存在的问题,作者认为就研究方法而言,中国法思想史的研究应该在客观陈述中国历史上的思想家、学派、思潮有关'法'的论述与传承的基础上,以现代法学的角度分析传统法思想的现实意义与影响;就研究内容而言,反省、批判是研究中国法思想史的应有之义,而继承、弘扬也是其应有之义;就学者自身而言,无论是研究中国法思想史,还是从事其他学术研究,养成独立的学人品格至关重要。若以现代法的视角研究古代社会的法思想,礼应该被纳入研究的视野。 | 马小红 Meng Fanjun | 2015 | 孔学堂2015，2，2： | 1 |
| 8 | Facile One-Pot Synthesis of ZSM-5 Aggregates with Interand Intra-Crystalline Mesopores for Methanol to Gasoline Conversion显示文摘ZSM-5 aggregates consisting of superfine and hierarchical nanocrystals(combined with micropores and intra-crystalline mesopores) with an average size of 30 nm were prepared through one-pot synthesis with the assistance of anionic polyacrylamide(APAM). The resultant zeolites(AHN-ZSM-5) were characterized by XRD, ICP-OES, SEM, TEM, BET, NH_3-TPD, Py-IR, and TG analyses and evaluated in the methanol to gasoline(MTG) reaction. Characterization results show that the hierarchical ZSM-5 aggregates possessed two kinds of mesopores, namely inter-and intra-crystalline mesopores. The amount of APAM considerably influenced the mesoporosity and textural properties of AHN-ZSM-5 zeolites. With the addition of APAM in the synthesis, the AHN-ZSM-5 zeolites exhibited large mesopore volume, large external surface area, and appropriate acidity. When applied in the MTG reaction, AHN-ZSM-5 demonstrated a catalytic lifetime that was 1.6 times longer than that of conventional ZSM-5 synthesized in the absence of APAM. | Yaquan Wang Chunyang Fan Hongyao Li Xiao Wang Fanjun Meng Chao Sun Liying Sun | 2019 | Transactions of Tianjin University2019，25，1： | 0 |
| 9 | MH1和PTEN基因在急性髓系白血病中的表达及临床意义(英文)显示文摘Objective:The aim of our study was to explore the correlations between both the genes,evolution and prognosis of the disease by detecting the expression of MN1(meningioma 1) gene and PTEN(phosphatase and tensin homolog) gene in patients with acute myeloid leukemia(AML).Method:MN1 and PTEN mRNA were detected by reverse transcription-PCR in mononuclear cells of 38 patients with AML and 13 patients with normal bone marrow.Results:Positive rates of MN1 and PTEN genes were 76.3% and 60.5% respectively in bone marrow mononuclear cells.The expression level of MN1 mRNA for the de novo group increased comparing with that for normal control group(P < 0.05),the expression level of PTEN mRNA for de novo group decreased obviously comparing with that for normal control group(P < 0.01),MN1 mRNA level decreased in remission group,while PTEN mRNA level increased comparing with that in de novo group(P < 0.05).MN1 mRNA level increased and PTEN mRNA decreased in relapsed group comparing with that in control group,and their difference was statistical significance(P < 0.05).The two genes' levels had negative correlations in acute myeloid leukemia(r =-0.314,P < 0.05).Conclusion:There is close correlations between expression of MN1 and PTEN genes and the prognosis and occurrence of acute myeloid leukemia,and their expression can be taken as significant indexes to access the de novo,relapse and prognosis of acute myeloid leukemia. | Xueshen Yan Fanjun Meng Hongguo Zhao Jie Yang | 2011 | The Chinese-German Journal of Clinical Oncology2011，10，4： | 0 |
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