The SSS code is an one dimensional code for shock and detonation propagations in which the elastic-plastic-hydrodynamic model is used. We modified the pressure boundary condition of SSS code and conducted some numerical simulations for liner implosion experiment. Meanwhile, using the one dimension MHD code, we also conducted the same numerical simulation for the same model. Thinking over the different initial conditions between the two codes, the results are basically consistent. And the consistence between the two codes shows that there is the probability to modify the SSS code as the SSS MHD code.

The shock wavefront produced by ejecta loading device was measured by fiber-pin, and the profile of shock wavefront was acquired by numerical simulation. According to the shape of shock wavefront, the eject time at different point of debris was calculated, and some distribution characteristics of particles ejected from debris surface can be explained by the results.

History, synthesis method and main physical parameters of moissanite gemstone are described. Comparing to other synthetic gemstone (such as corundum, cubic zirconia), the moissanite gemstone is suitable for high-pressure anvil. The advantages and prospects of moissanite anvil cell for high-temperature and ultrahigh-pressure experiments studies are reviewed.

The (Sr, Ca)_n+1Cu_nO_2n (Cl, O)₂ superconducting homologous series have been briefly introduced. The emphasis is on the special charge reservoir block of the oxyhalide high T_c superconductror (HTSC), which consists of the halide layer instead of the routine oxide layer. Consequently the apical oxygen related to the p-type HTSC is missed in the compound whereas the apical chlorine bridges the conducting layer and the charge reservoir. In the context a novel hole doping mechanism named “apical oxygen doping” was introduced through partially substituting oxygen for chlorine. This chemical doping leads to an 80 K superconducting transition in the high pressure synthesized double layered (Sr, Ca)₃Cu₂O₄ (Cl, O)₂ oxyhalide. Not only the high T_c, the oxyhalide cuprate superconductor also demonstrates the comparable physical properties to those of the full oxide HTSC, indicating the promising prospects to develop new high T_c oxyhalide superconductors.

Shock compression techniques can be applied to porous materials to reproduce thermodynamic states at high temperatures and high densities, and a lot of Hugoniot data were published in the past two decades. To investigate the intrinsic relationship between Hugoniot curves of dense metals and porous ones is of importance for development of more reasonable equation of state (EOS) models. In this paper, a set of differential equations, which relate the temperature and density of the shocked states along an isobaric path in p-V-T space to its initial densities of the porous material, is deduced from the traditional three-terms EOS and Grüneisen EOS of solids. The differential formula of Wu-Jing EOS and the analytic expression of the Wu-Jing variable (R_p) are given. It is emphasized that Wu-Jing EOS is resulted not only from the contribution of crystal vibration as traditionally considered but also from most of the thermal electron effects. The new differential equations are applied to porous copper, and the effects of the thermal electrons to shock temperature, compression density, and value of Wu-Jing variable are discussed. It shows that the existence of the thermal electrons will reduce the increase rate of R_p with decrease of density.

Synthesis of cubic boron nitride (cBN) crystal in the system of Mg-hBN with water, in the form of free or bonded, was investigated under the pressure and temperature of 4.5~5.5 GPa and 1400~1800 ℃. Results indicate that the form and the amount of water have important effect on the colour, the nucleation rate and the growth of cubic boron nitride crystals. Free water can depress the number of nucleus, and bonded water will change the colour and decrease the temperature for the synthesis of cBN crystals.

Tin and lead beads are chosen to conduct the high velocity impact experiments with an explosive plane wave generator. The impact velocity is about 2 km/s. A metallurgic picture of the recovered specimen shows that there are four bands along the interfaces between tin and lead. The width across the bands is about 60~80 μm. The SEM examination discloses that these bands are the mass mixing regions of tin and lead. The dynamic diffusion coefficient of the experiments is 0.9 cm²/s, which is much higher than that at quasi-static case. A discrete element simulation (DEM) demonstrates the process and mechanisms of the observed mass mixing for Pb-Sn beads under shock loading at meso-scale qualitatively.

The extent and crystal structure of the solid solution based on Ca₂Pr₂Cu₅O₁₀ were studied by X-ray diffraction combined with Rietveld structure refinement. According to the principle of valence neutralization and the disappearing-phase method, in the Ca-rich region (i.e. Ca/Pr>1) the composition of solid solution can be expressed as the general stoichiometry Ca_2+xPr_2-xCu₅O₁₀, and in the Pr-rich region (i.e. Ca/Pr<1) as Ca_1.7Pr_2.2Cu₅O₁₀、Ca_1.4Pr_2.4Cu₅O₁₀, i.e., the solid solubility of the Ca₂Pr₂Cu₅O₁₀-based solid solution can be determined as from Ca_2.4Pr_1.6Cu₅O₁₀ to Ca_1.4Pr_2.4Cu₅O₁₀. The crystal structure of Ca₂Pr₂Cu₅O₁₀ based solid solution is an incommensurate phase based on the orthorhombic NaCuO₂-type subcell. The lattice parameters of Ca_2.4Pr_1.6Cu₅O₁₀ subcell are a₀=0.28246 (7) nm, b₀=0.63693 (1) nm, c₀=1.06794 (1) nm, and its orthorhombic superstructure is with a=5a₀, b=b₀, c=5c₀. The Ca_2.4Pr_1.6Cu₅O₁₀ structure is also determined by using a monoclinic supercell with space group P2₁/c, Z=4, a=5a₀, b=b₀, c=c₀/sinβ and β=104.79 ° or 136.60 °, V=5 a₀b₀ c₀. In the structure of the solid solution based on Ca₂Pr₂Cu₅O₁₀, the mutual substitution between Pr and Ca is possible in some bound. Furthermore, they are distributed disorderly in the structure.

The effect of preparation pressure on the structural, magnetic and electronic properties has been investigated for nanostructured bulk samples of La_2/3Sr_1/3MnO₃. The results show that the grain size decreases and magnetoresistance varies with preparation pressure growth. Low-field magnetoresistance weakens in the whole experimental temperature range when preparation pressure increases, which can mainly attribute to strong-link grain boundaries of samples under high preparation pressure. And high-field magnetoresistance gradually becomes stronger at T<200 K, however becomes weaker at T>200 K with the increase of preparation pressure, which can mainly due to the change of grain size caused by preparation pressure.

By solving the two-dimensional Euler equations coupled with the chemistry, a numerical simulation of transient detonation process induced by flame for H₂-O₂-N₂ mixture was performed, and a detailed chemical mechanism for H₂-O₂-N₂ system, which included 19 element reactions and 9 species, was involved. A splitting operator method was used to treat separately the hydrodynamical process and chemical process in the detonation simulation. The TVD scheme was used to capture the detonation wave and the Gear algorithm was used to solve the chemical reaction. The calculated results show that combustion rate of flame can be accelerated and lead to the occurrence of detonation when the initial mole fraction ratio of the mixture is H₂∶O₂∶N₂=0.4∶0.4∶0.2 and the initial nondimensional temperature is T/T₀=5.3, the detonation wave can be propagated steadily with the detonation velocity of 2300 m/s. The reflection of the detonation wave can be observed. In addition, the variations of species concentrations and temperature behind the detonation wave were also discussed in order to understand the inherent structure behind the detonation wave.