Hydrogen storage properties of flexible and porous La0.8Mg0.2Ni3.8/PVDF composite

A study on the hydrogen storage properties of flexible and porous La_0.8Mg_0.2Ni_3.8/PVDF (polyvinylidene fluoride) composite was reported. In this composite, PVDF acted as a binder to connect the alloy powders and (NH₄)₂CO₃ as a pore-forming agent to create void space. Increasing PVDF content, the hydrogen absorption kinetics of the composite gradually decreased. Increasing (NH₄)₂CO₃ from 1% to 5%, the capacity firstly increased and then decreased. 0.08–0.13 wt% increased capacity for the composite was observed at 70 °C by comparison with the intrinsic composite (La_0.8Mg_0.2Ni_3.8/1%PVDF). Varying temperature from 0 °C to 100 °C, 0.1–0.15 wt% increased capacity were obtained for the typical porous composite (La_0.8Mg_0.2Ni_3.8/1%PVDF/3%(NH₄)₂CO₃). The PVDF-assisted composite showed the flexible/solidified characteristic in hydriding/dehydriding, which maybe lowed down the oxidation of the alloy powders and preserved the void space. Finally, ∼0.1 wt% increased capacity remained after ten hydriding/dehydriding cycles.     

Influence of natural fibre reinforcements on the flammability of bio-derived composite materials

Composite materials are increasingly being used in applications in which their fire response is a critical consideration. Environmental concerns motivate the use of natural fibres, but they represent an additional fuel source for combustion, and their composites will perform worse in flammability testing compared to synthetic alternatives. An experimental study is presented, comparing flax fibre reinforced epoxy samples to composites formed from glass fibre reinforcements of similar architecture, reinforcing the same resin system. The flax composites ignite earlier, release greater levels of heat, and their structure deforms significantly during combustion. Further studies are required to increase understanding of the combustion process, if efficient mechanisms are to be found to reduce flammability of natural fibre composites to acceptable levels.     

Comparison of uncertainty quantification process using statistical and data mining algorithms

Uncertainty quantification has always been an important topic in model reduction and simulation of complex systems. In this aspect, global sensitivity anal     

二氧化氯杀生剂在油田水和循环冷却水中的应用

二氧化氯杀生剂优点很多。在油田水处理系统中,ClO2杀生剂不仅能杀亚微生物,而且能氧化还原性物质,具有明显的增产效果。在循环冷却水水质处理中,ClO2的强氧化性、安全性及较低的生产成本,在水处理行业具有广阔的应用前景。     

A Simple Method for Calculating Settlement-Time Curves of PVD-Improved Deposits

Soil Mechanics and Foundation Engineering - A simple method has been proposed for calculating the settlement-time curves of deposits improved by prefabricated vertical drains (PVDs). This method...