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- aeolian ripple mark 风成涟痕
- Controls on the shape of aeolian ripple during its development are investigated experimentally in a wind tunnel.The experiments were conducted with one test sand and four different stream velocities. 摘要在四种风速条件下,对沙纹形成过程中的形态变化进行了风洞实验研究,讨论了沙纹宽度、沙纹迎风坡宽度、沙纹背风坡宽度、沙纹高度和沙纹指数与风速和输沙量的关系。
- Numerical simulation of aeolian ripple formation 风成沙纹形成过程模拟与形态分析
- Review of Numerical Simulation of Aeolian Ripple 风成沙纹数值模拟研究述评
- The dark-gray traction current deposits belong to internal-tide deposits, it develops sandstones and siltsands, and charactered with lenticular, wave, flaser bedding, bimodal cross-bedding and ripple mark. 深水牵引流沉积为内潮汐沉积类型,岩性为细砂岩、粉砂岩,以发育透镜状、波状、脉状层理、双向交错层理、波痕等沉积构造为特征。
- Wavelength and Height of Aeolian Ripple in a Wind Tunnel 风成沙纹发育过程中形态变化的风洞实验研究
- Based on the saltation, creeping and stability models, a two-dimensional numerical model is established to study the development process of aeolian ripples. 通过简单的跃移模型、蠕移模型和稳定模型对风成沙纹的形成过程进行了二维数值模拟研究。
- Surface quality of billets shall be free from all harmful defects like surface cracks, seams, laps, folds,scabs blowholes,deep ripple marks, aluminum patches, slag patches etc. 钢坯表面要避免一些瑕疵譬如裂纹,接缝,重叠,折痕,抓痕,深的波纹,斑点等。
- The water scarcely reached my waist; the sand was firm and covered with ripple marks, and I waded ashore in great spirits, leaving the Hispaniola on her side, with her mainsail trailing wide upon the surface of the bay. 水刚到我的腰问,脚下的沙滩很坚实,上面留有一道道波纹。 我精神百倍地涉水上了岸,任凭西斯潘尼奥拉号侧身倒在那里,也任凭它的主帆漂在小湾的水面上。
- Six sedimentary structures, ice split seams, ice slid marks, ice collapsed seams, ice induced pellets, ice eroded ripple marks and ice level marks, are newly found in Yellow River delta. 在黄河三角洲新识别出 6种冰冻沉积构造 :冰劈裂缝、冰成滑痕、冰塌裂缝、冰成球粒、冰蚀波痕和冰位痕。
- Based on practical experience, the authors put forward effective prevention methods to decrease the defects in sanding process, such as sanding marks, ripple marks and creases on fabric. 针对常见真丝绸砂洗的疵病,如砂洗痕、水玻璃皱、布面皱痕等,作者提出了有效的防止措施。
- He vainly tried to mark the defacing stain out. 他试图除去有损外观的污迹,但没有成功。
- A ripple of laughter went through the audience. 观众中响起一阵轻轻的笑声。
- Her school work isn't quite up to the mark. 她的功课不大符合要求。
- That was just a lot of hot air what Mark said. 马克所说的不过是一大堆空话。
- Indicator of Outside Geologic Action: Ripple Marks 控制流水波痕的外部地质作用
- War has left its mark on the country. 战争给该国留下了不可磨灭的痕迹。
- The public scandal left a black mark on his career. 这一尽人皆知的丑闻给他的事业留下了污点。
- How much do you know about the works of Mark Twin. 马克。吐温写的作品你知道多少?
- Happy anniversary, Helen and Mark! 海伦、马克,祝你们结婚周年快乐!