Research of Automatic Pad-printing Machine of Date Indicators

我国是世界上主要的手表生产地之一。但是，当前我国手表行业的生产工艺水平却与这一数据并不相符：手工装配和半自动化生产仍是手表行业的主要生产方式，生产效率低、产品一致性差。改用自动化生产线，以自动化的机械生产替代人工操作，可大幅提高生产效率，减少人为因素对生产过程的干扰。 本课题设计了一套手表日历环全自动移印设备，用于实现手表日历环转移印刷生产的全程自动化。传统的移印机仅能自动完成日历环印刷过程，而日历环的上下料动作均依赖手工，生产效率低，人力成本高，产品质量受人为因素的干扰，废品率居高不下。本课题设计的设备可自动完成日历环从送料到印刷的全过程，实现了日历环移印生产的全程自动化，能明显提高日历环...China is one of the major watch producers in the world. However, the current producing technology level of China's watch industry is not consistent with this situation. Manual and semi-automatic assembly is still the main mode of watch production in China's watch industry, which leads to a low production efficiency and a low product consistency. Switching to the automatic production lines and usin...学位：工学硕士院系专业：物理与机电工程学院_机械制造及其自动化学号：1992010115276

基于MD_Nastran的双卡套管接头性能分析

双卡套管接头各组件形成密封的过程是典型的边界条件高度非线性问题。文中基于Md_nASTrAn的SOl600模块对某型12MM内径的双卡套管接头进行了隐式非线性分析,确定了该型双卡套管接头形成有效密封后各组件的应力大小、应力分布等关键性能参数,为该型双卡套管接头的改进和后续研发提供了有益的参考

Potential impacts of pandemics on global warming, agricultural production, and biodiversity loss

The rising frequency of infectious diseases under climate change poses an emerging threat to environmental and agricultural sustainability by consuming large quantities of materials. The demand for crops to produce personal protective equipment (PPE) competes for land and fertilizers, leads to cropland expansion, and accelerates climate change, but the ecological impacts remain unclear. Here we explore the impacts of pandemics on global warming, agricultural production, and biodiversity loss in an Earth system model by developing relationships between consumption of PPE and the rate of infection during COVID-19. Meeting the demand for PPE would increase production of cotton lint, corn, and natural rubber, which accelerates global warming by 0.2°C with 1.8% additional species losses by 2100. Our results suggest that the risks of public health, food security, climate change, and ecological integrity have been connected to each other, which should be considered when predicting the impacts of future pandemics

Finite element model and analysis of mandibular incisors' orthodontics

Conference Name:2012 International Conference on Advanced Materials Design and Mechanics, ICAMDM 2012. Conference Address: Xiamen, China. Time:June 5, 2012 - June 7, 2012.This paper uses finite element method (FEM) to simulate the stress distribution and the displacements during the orthodontic process of the mandibular lateral incisor. It provides theoretical guidance for the design of the orthodontic treatment. This study is as follows: (1) Use the software of MIMICS to reconstruct models of the mandible and the dentition by CT scanning images. (2) Use the software of Pro/Engineer (Pro/e) to simplify the model built in Mimics, establish the model of the orthodontic brackets, and assemble the mandible, the dentition and the brackets together. (3) Simulate the process of orthodontic surgery, use the software of ANSYS to study the effect of orthodontic surgery by changing the direction in which external force is applied, and reveal the regularity of displacements and stress distribution of the mandibular lateral incisor caused by local displacements. 漏 (2012) Trans Tech Publications, Switzerland

苏打盐渍土的微域特征以及水分的迁移规律探讨

通过野外定位观测和室内分析,探讨了苏打盐渍土微域特征(32m长的横截面)及其水分和地下水之间的转化规律。结果表明:微地貌格局是影响土壤水分迁移的主要因素。盐化草甸土分布在相对低洼的部位,苏打碱土分布在微坡地和高平地。苏打碱土质地为粉砂质亚粘土-粘土-粉砂-砂砾垂直结构,盐化草甸土以粉砂和砂砾结构为主,缺少粘土层。在0-100kPa的基质势作用下,苏打碱土的水分含量变化很微弱,盐化草甸土的水分发生明显的变化。洼地土壤(盐化草甸土)成为地表水和地下水转化的通道。承接微坡地和高平地的径流,洼地(盐化草甸土)在雨季含水率较多且迅速补给地下水,使之逐渐上升。坡地土壤(苏打碱土)的整个土层含水率变化不显著