No abstract

Pulsed power technology, whereas the electrical energy stored in a relative long period is released in much shorter timescale, is an efficient method to create high energy density physics (HEDP) conditions in laboratory. Around the beginning of this century, China Academy of Engineering Physics (CAEP) began to build some experimental facilities for HEDP investigations, among which the Primary Test Stand (PTS), a multi-module pulsed power facility with a nominal current of 10 MA and a current rising time ∼90 ns, is an important achievement on the roadmap of the electro-magnetically driven inertial confinement fusion (ICF) researches. PTS is the first pulsed power facility beyond 10 TW in China. Therefore, all the technologies have to be demonstrated, and all the engineering issues have to be overcome. In this article, the research outline, key technologies and the preliminary HEDP experiments are reviewed. Prospects on HEDP research on PTS and pulsed power development for the next step are also discussed.

The method of molecular dynamics (MD) simulations was used to investigate the interaction between the PLA and the attapulgite, and the influence of the temperature on the mechanical properties of the PLA and the PLA-attapulgite. After the PLA blends the attapulgite, the structures and properties of the PLA and the attapulgite change due to their strong interaction. However, this interaction weakens gradually with temperature increasing. The isotropy of the composite of PLA-attapulgite is strengthened in comparison with the PLA. In addition, the temperature can change the mechanical properties of the PLA-attapulgite, but the mechanical properties of the PLA are hardly influences on the temperature. The PLA-attapulgite is more rigid and tough than the PLA at the room temperature but the toughness of the composite of PLA-attapulgite becomes worse than that of the PLA at 350 K.

The density functional theory generalized gradient approximation has been used to study the adsorption of nitroamine molecules on the Al(111) surface. The calculations employ a 4 × 4 aluminum slab with three layers and three-dimensional periodic boundary conditions. There exist both physical and chemical adsorptions associated with different NH 2 NO 2 molecule orientations and particular aluminum surface sites. For the nondissociative adsorption, the nitro oxygen atom orients to the Al surface. In the case of dissociative chemisorption, the O and N atoms bind with the Al surface. The O and N atoms of broken down N-O and N-N bonds form strong Al-O and Al-N bonds with the neighboring Al sites around the dissociation sites. Moreover, the radical species obtained as a result of N-O and N-N bond dissociation remains bonded to the surface. The largest adsorption energy is -893.8 kJ/mol. For the dissociation adsorption configurations, a significant charge transfer occurs. The most charge transfer is 3.04 e from the Al surface to the NH 2 NO 2 molecule. The change of the electronic structures is obvious due to the dissociation of the N-O and N-N bonds and the formation of strong Al-O and Al-N bonds. It can be inferred that the aluminum surface is readily oxidized by the adsorbate of nitroamine, by dissociation of either the O and N atoms from the nitro group or the N atom from the amino group.