Mechanism of twin formation in sputter-grown ZnO/Al2O3(0001) heteroepitaxial films

The mechanism of the twin formation and strain evolution of highly mismatched sputter-grown ZnO/Al₂O₃ (0001) heteroepitaxial films was investigated. Based on the real time synchrotron X-ray scattering measurements, the existence of the transition thickness at which the twin of the 30° rotated domains start to nucleate within the ZnO films was revealed. It was shown that the twin growth above the transition thickness stops as the strain almost fully relaxes, which indicates that the twin in the sputter-grown ZnO is a mechanical twin, not a growth twin. We presented a schematic modeling of the twin formation during the early growth stage.     

棉籽饼粕双螺杆挤压脱毒中的参数研究

考察了棉籽饼粕双螺杆挤压脱毒中不同加工参数对脱毒效果的影响。结果表明：增大螺杆转速、减低喂料速度，脱毒效果变好。但考虑到产量要求，喂料速度不宜过低，故实际中应做到均衡。含水率的影响较为复杂，因原料、操作条件不同而异，一定范围内含水率提高可配以较高螺杆转速、温度及较小口模直径，不同捏合盘长度和位置其效果也不一样，因而一定操作条件下各加工参数间应适宜匹配。此外，实验结果还表明棉籽饼粕双螺杆挤压脱毒是成功的，效果显著。     

一种新型的深孔负压装置研究

通过对现有DF深孔钻削系统的结构及工作原理的理论分析,研究新型双锥面负压射流结构、负压机理及排屑特性,提供一种排屑能力更强、工艺性更好、加工精度和生产效率更高、孔径实用范围更广的新型深孔双锥面负压装备,应用于ZK2138深孔钻床,结合理论分析,进行正交化设计试验,最终确定新型双锥面负压射流通道的合理几何参数.     

双螺杆连续混炼机混炼理论研究

运用流体动压润滑的基本方程揭示了双螺杆连续混炼机中树脂的速度分布和压力分布规律；给出了树脂所受剪应力和剪切速率的计算公式，确定了最大剪应力的作用位置；指出最大剪应力可以表示混炼机的混炼程度，并分析了混炼强度的影响因素和影响规律，研究工作对于双螺杆连续混炼造粒机组的国产化研究具有重要意义。     

环形板的塑性极限统一解

采用统一强度理论求出了环形板的塑性极限荷载，内力场及速度场的统一解，得出不同参数b值及材料的拉压比α对极限荷载的影响曲线。所给出的解可以灵活使用于各种性能的材料，可以充分反映材料的SD效应及中间主应力效应。文献中已有的Tresca解、Mises解、双剪应力屈服准则解以及双剪统一屈服准则均为本文的特例。     

Role of defect structure on hydrogenation properties of Zr0.9Ti0.1V2 alloy

The pseudobinary Zr_0.9Ti_0.1V₂ compound was prepared by induction melting method. The microstructure and phase compositions were examined by the scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). Hydrogen absorption pressure composition isotherms (P-C isotherms) were investigated by pressure reduction method using Sievert apparatus at temperature ranging from 673 to 823 K. The compositional homogeneity of the alloy was achieved under the homogenizing treatment at 1373 K for 100 h. Twin defects with {111}<022> orientation relationship were observed in the Zr_0.9Ti_0.1V₂ annealed at 1373 K for 100 h. The phase compositions of the annealed Zr_0.9Ti_0.1V₂ alloy could be attributed to ZrV₂ Laves phase and V BCC solid solution. After hydrogenation, the alloy hydrides were consisted of ZrV₂H_3.6 and V₄H_2.88. Titanium substitution in the Zr_0.9Ti_0.1V₂ alloy induced the formation of twin defect structures and the multiphase consisting of Laves (C15 type) related with BCC solid solution phases. The especial phase compositions and structures in the alloy were favorable to decrease the equilibrium pressure and improve the hydrogen absorption kinetics due to the twin defects in Zr_0.9Ti_0.1V₂ comparing with the primary ZrV₂ alloy. The desorption hysteresis could be decreased to a certain extent in the Ti-doped alloy under the experimental condition. V-based BCC phase in the Zr_0.9Ti_0.1V₂ alloy could improve hydrogen absorption and desorption properties by an autocatalytic mechanism.     

凡口铅锌矿主井提升系统的改造设计

凡口铅锌矿为了适应有色金属工业发展的需要,决定对主井提升系统实施技术改造,文章阐述了技改方案的选择以及为了达到技改目的所采取的措施。     

国外双螺杆挤压膨化机的研究现状

为适应纤维食品加工技术的需要,本文从挤出理论,物料流型及混合效果,停留时间分布等方面介绍了国外８０年代以来双螺杆挤压膨化机的研究动向。     

基于CIM智慧城市的规划

文章对基于CIM智慧城市的规划领域进行研究,指出目前CIM仍停留在BIM和GIS阶段。通过对CIM应用场景的调研,阐述在基于CIM的智慧城市业态下,如何能够更好的开展“智慧城市”规划,以提升城市规划水平。文章指出,把智能化手段融入到传统城市规划的过程中,应把CIM相关内容(BIM、GIS和IOT)与AI、大数据和云计算等技术相结合,在多场景下对规划方案优选,实现规划精准、要素全面、场景真实的规划效果。还提出CIM不仅应用在智慧城市的规划建筑行业,还覆盖政务服务、城市治理、公共服务、产业经济等多个智慧城市的其他领域,通过基于CIM的智慧城市相关规划手段,可加快智慧城市向前演进的速度。     

USE of Ozone To Control Ceratomyxosis in Steelhead Trout

Tests conducted with a pilot scale ozone system to control the infective stage of the fish Pathogen Ceratomvya shasta found the minimum effective ozone dose to be a CT value (ozone residual x minutes of retention) of 1.23. Mortality of summer steelhead reared to, term on ozonated and raw river water was 1.4% and 81.2% permil; respectively. Test fish were significantly larger at the end of the rearing period. A full production system for the hatchery has been recommended.