Fatigue behaviors and atomic-scale mechanisms in nanocrystalline gold thin film

The fatigue properties of 930 nm-thick Au films and 1 {\mu}m-thick Au film with a Ti interlayer are systematically investigated. The dominant damage behaviors of 930 nm-thick Au films under dynamic bending cyclic loading changed from extrusions to intergranular cracks with the decrease in strain ranges and the increase in cyclic cycles. The different fatigue behaviors are attributed to the process of edge dislocation annihilation and vacancy formation during cyclic deformation. Depositing 10 nm-thick Ti interlayers between the PI substrates and 1 {\mu}m-thick annealed Au films is effective to suppress strain localization and increase the rupture strain and the fatigue properties of thin Au films. This study shed lights on the fatigue mechanism and provide clues to design nanocomposites in the flexible displays in the practical application.Comment: 25 pages, 8 figure

Jiushi as a Pragmatic Marker: Evidence from the Heart-to-Heart Radio Program

Master'sMASTER OF ART

BIOMIMETIC MEMBRANES EMBEDDED WITH AQUAPORIN Z FOR WATER REUSE AND DESALINATION

Ph.DDOCTOR OF PHILOSOPH

Endovascular Embolization of Ruptured Infundibular Dilation of Posterior Communicating Artery: A Case Report

Hemorrhage due to the rupture of the infundibular dilatation of the posterior communicating artery (ID of the PCo-A) occurs infrequently. The preferred treatment of such hemorrhages is surgical clipping through craniotomy. There are few reports about endovascular coil embolization in such cases. We report such a case treated by endovascular embolization. A 35-year-old man, who had experienced 2 episodes of subarachnoid hemorrhage (SAH), was found to have a ruptured ID of the PCo-A by head computed tomography angiography (CTA) and digital subtraction angiography (DSA). We performed stent-assisted endovascular coil embolization through a combined anterior and posterior circulation approach. Postembolization angiography showed absence of contrast filling of the ID of the PCo-A and nonleakage of the contrast agent. The patient recovered well with no complications. SAH recurrence was not recorded during the 1-year followup. The postoperative angiographic result was good. To our knowledge, this is the first case of hemorrhage due to ruptured ID of the PCo-A that was treated by such a technique

Status and prospect of intelligent key technologies of belt conveyor

As the key equipment of the coal transportation system, the intelligence of the belt conveyor is crucial to the safe and efficient transportation of coal mines. And it is of great significance to improve the safety level of coal mines and ensure a stable supply of coal. Driven by the new technological revolution, the field of belt conveyor intelligence is in the stage of accelerated development. Key intelligent technologies such as information system platforms, intelligent control, measurement and sensing have made continuous progress, showing a trend of multi-point breakthroughs and all-around development. However, the relevant technologies are mostly applied experimentally in coal mining enterprises and have not been widely promoted. This paper reviews the research and development trend of key technologies for intelligent belt conveyors in recent years and summarizes the problems encountered in engineering applications. First, the authors give an overview of the development of belt conveyor intellectualization, focusing on the technical characteristics of belt conveyors with different carrying types and the technical requirements for intelligent development. Then, the key technical problems that need to be solved for idler belt conveyor intelligence are pointed out. The current research status of four key directions, such as energy saving technology of belt conveyors, coal flow sensing technology, health status monitoring technology, and safety assurance technology, is introduced. The article analyzes the application of computer vision, big data analysis, intelligent control, and decision-making technologies in engineering, and discusses the existing problems and future development trends. Finally, the development suggestions for belt conveyors are proposed from the perspective of intelligent monitoring and control research, combined with the analysis of related technology research results at home and abroad. The future research directions of intelligent key technologies such as non-contact coal flow intelligent sensing of belt conveyors, transparent conveying based on multi-source information fusion, frequency conversion and energy-saving control, and virtual reality are discussed

Numerical Simulation on the Influence of Bridge Construction on River Flood Control in a Bottleneck Reach

Bottleneck reach regions with narrow and deep cross sections prevent sediment transport and weaken flood control capacity. In addition, bridge constructions can exacerbate the risk of flooding in these areas. In this study, the Longhai Railway Extension Project at the Xianyang reach of the Weihe River in China was selected as a typical object. A horizontal 2-D numerical model was used to assess the effects of three engineering plans on flood discharge capacity under three flood frequencies. Plan 1 was designed to include building a new bridge, demolishing the three original bridges and dredging a single section of the channel. Plan 2 was the same as Plan 1, except for the compound sections. Plan 3 was designed with the four bridges coexisting and no dredging projects carried out. The results indicated that Plan 3 will increase the water level by 0.2-0.3 m in the upstream reach. The cross-sectional area was approximately 370 m2 larger under Plan 1 than under Plan 2. Water levels of 300-, 100-, and 5-year flooding around the bridge were reduced by 0.9, 0.9, and 0.6 m, respectively. To improve flood control capacity, an effective dredging project must be executed to widen the river and reduce the water stage in the bottleneck reach where the bridge is constructed