Micro‐CT scanning analysis for inner structure of porous media

A micro‐CT scanner was employed to investigate inner characteristics of porous media, and particular cakes were taken as samples. By obtaining the inner pore structure and inner structure reconstruction, porosity and its variation in the samples, water distribution in pores, and other inner characteristics were determined and explored. When the sample was dried after immersion in water, the solid frame shrank, some pores became larger and the porosity increased, while the sample not immersed in water did not change much after being dried. The experiments indicate that micro‐CT scanning is an effective technology to study the inner structure of porous materials with pores larger than tens of microns and also can be used to explore some important transport performance. ©2007 Wiley Periodicals, Inc. Heat Trans Asian Res, 36(4): 208– 214, 2007; Published online in Wiley InterScience ( www.interscience. wiley.com ). DOI 10.1002/htj.20155 Copyright © 2004 Wiley Periodicals, Inc.     

通信动力设备维护经验交流

在通信行业中动力设备维护通常都涉及多个专业,如电子电工、机械、化学、制冷及计算机通信等多个学科。随着设备日趋集成化、智能化、模块化,设备更换日新月异,虽然设备变得复杂,但动力维护的工作量减轻,维护变得更简便,对维护者的素质要求越来越高。文中详细分析了通信动力设备的故障现象,并给出了故障处理方法。     

Multi-layer phenomena in petawatt laser-driven acceleration of heavy ions

Laser-accelerated high-flux-intensity heavy-ion beams are important for new types of accelerators.A particle-in-cell program(Smilei)is employed to simulate the entire process of Station of Extreme Light(SEL)100 PW laser-accelerated heavy particles using different nanoscale short targets with a thickness of 100 nm Cr,Fe,Ag,Ta,Au,Pb,Th and U,as well as 200 nm thick Al and Ca.An obvious stratification is observed in the simulation.The layering phenomenon is a hybrid acceleration mechanism reflecting target normal sheath acceleration and radiation pressure acceleration,and this phenomenon is understood from the simulated energy spectrum,ionization and spatial electric field distribution.According to the stratification,it is suggested that high-quality heavy-ion beams could be expected for fusion reactions to synthesize superheavy nuclei.Two plasma clusters in the stratification are observed simultaneously,which suggest new techniques for plasma experiments as well as thinner metal targets in the precision machining process.     

Pickering emulsion transport in skeletal muscle tissue: A dissipative particle dynamics simulation approach

Lymph node targeting is a commonly used strategy for particulate vaccines, particularly for Pickering emulsions. However, extensive research on the internal delivery mechanisms of these emulsions,especially the complex intercellular interactions of deformable Pickering emulsions, has been surprisingly sparse. This gap in knowledge holds significant potential for enhancing vaccine efficacy. This study aims to address this by summarizing the process of lymph-node-targeting transport and introducing a dissipative particle dynamics simulation method to evaluate the dynamic processes within cell tissue.The transport of Pickering emulsions in skeletal muscle tissue is specifically investigated as a case study.Various factors impacting the transport process are explored, including local cellular tissue environmental factors and the properties of the Pickering emulsion itself. The simulation results primarily demonstrate that an increase in radial repulsive interaction between emulsion particles can decrease the transport efficiency. Additionally, larger intercellular gaps also diminish the transport efficiency of emulsion droplet particles due to the increased motion complexity within the intricate transport space compared to a single channel. This study sheds light on the nuanced interplay between engineered and biological systems influencing the transport dynamics of Pickering emulsions. Such insights hold valuable potential for optimizing transport processes in practical biomedical applications such as drug delivery. Importantly, the desired transport efficiency varies depending on the specific application. For instance, while a more rapid transport might be crucial for lymph-node-targeted drug delivery, certain applications requiring a slower release of active components could benefit from the reduced transport efficiency observed with increased particle repulsion or larger intercellular gaps.