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| 1 | Adiabatic Shear Bands in 30CrNi_3MoV Structural Steel Induced during High Speed Cutting显示文摘The width and spacing of adiabatic shear bands (ASBs) in the serrated chips generated during high speed orthogonal cutting of 30CrNi3MoV structural steel were measured by optical microscopy (OM), the temperature rise in the shear band was estimated. The microstructures of the ASBs were also characterized by SEM and TEM. The results show that the width and spacing of ASBs decrease with the increase of the cutting speed. The further observations show that the microstructure between the matrix and the center of the ASB gradually changes, and that the martensitic phase transformation, carbide precipitation and recrystallization may occur in the ASB. | Chunzheng DUAN and Minjie WANGKey Laboratory of Ministry of Education for Precision and Non-traditional Machining, School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China | 2004 | Journal of Materials Science & Technology2004，20，6： | 3 |
| 2 | Determining development density using the Urban Carrying Capacity Assessment System显示文摘 | Kyushik Oh Yeunwoo Jeong Dongkun Lee Wangkey Lee Jaeyong Choi | | 0，，01： | 1 |
| 3 | Determining development density using the Urban Carrying Capacity Assessment System显示文摘 | Kyushik Oh Yeunwoo Jeong Dongkun Lee Wangkey Lee Jaeyong Choi | 2004 | Landscape and Urban Planning2004，，1： | 1 |
| 4 | Momentum profile of aeolian saltation cloud显示文摘The momentum profile of an aeolian saltation cloud is poorly understood. In this paper, height profiles for saltation momentum are reconstructed for three particle-size populations at four wind velocities based on profiles for mean particle velocity and relative particle concentration of saltation cloud obtained using particle image velocimetry in a wind tunnel. The results suggest that the saltation momentum profiles are characterized by peak curves with a maximum at some height above the surface. The height of this maximum increases with increasing wind velocity, but decreases with increasing particle size. It is linearly correlated with average saltation height and is comparable with the results of numerical simulations in a previous study. Our results confirm that Bagnold's kink is an important feature of wind velocity profiles modified by the presence of saltating particles and that the height of the kink is closely related to the average trajectories of the saltating particles. | ZhiBao Dong*, WanYin Luo, GuangQiang Qian, HongTao WangKey Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China | 2009 | Research in Cold and Arid Regions2009，1，1： | 0 |
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