The melting-point of nano-diamond was reported in this paper. The Debye characteristic temperature of nano-diamond was calculated based on X-ray diffraction intensities by the methods introduced by LU Xue-Shan and LIANG Jing-Kui. Its Debye characteristic temperature is 411.7 K, which is about one-fifth of the Debye characteristic temperature of bulk diamond single crystal synthesized under high temperature and high-pressure condition. The melting point of nano-diamond is 2070 K calculated with Lindemann's formula. The atom vibration amplitude, which deflected balance position, increases two times or more. This leads to the increasing of activity of nano-diamond.

By means of X-ray flash radiographs, the jet formation and penetration of two types of shaped charge with large cone angle were investigated, and compared with that of the jet of shaped charge with small cone angle (42 °). The experimental results show that (1) the jet of shaped charge with large cone angle is characterized by a lower jet tip velocity and a very large portion of the liner mass, and (2) at a long standoff the depth of penetration in steel target is small, but the diameter of hole is large.

Hydroxyapatite (HA) is an effective material used in bone prostheses. The activating and sintering characteristics of hydroxyapatite agglomerate treated by shock wave were studied. Using XRD and SEM the grain size refinement, homogenization and lattice deformation were observed in shocked HA powders, which can promote sintering of HA ceramics. The extra energy stored in shocked powders will be released during sintering process. The temperature of maximum shrink rate of shocked sample is about 70 lower than that of unshocked one. The strength and density of HA ceramics from the shocked sample can be enhanced. HA ceramics with high strength used for artificial bone materials can be made with the shock-activating method.

The essential change caused by sudden heat energy release in a detonation process is not fully considered by the CJ and ZND model. In these classical detonation theories, the entropy at the final detonation point is the lowest one among all possible states, and the probability is the lowest. The final detonation point shall be decided by the thermodynamics, which can not be achieved through the ZND model. The fluid mechanics and thermodynamics laws must be satisfied in a goog detonation model.

Two models, Mixing phase model and Equivalent material model, were developed based on a mixing principle. By applying them to 304 steel, the pressure-temperature curve was calculated. It was shown that the calculated curve was in agreement with that calculated directly using material parameters of 304 steel.

This paper investigates the reliability of calcite as a pressure gauge for the hydrothermal diamond anvil cell (HDAC) by the experiment at the pressure of 0.1~800 MPa and the temperature of 26 ℃, and defines the relation between the pressure and the Raman peak position of calcite in ambient temperature. The result shows that calcite is stable at the experimental pressure, and the intensity of its 1085 cm^-1 Raman peak is two times greater than that of the 464 cm^-1 Raman peak of quartz, calcite is reliable as a pressure gauge for the hydrothermal diamond anvil cell. The relation between the system pressure and peak position of calcite (1085 cm^-1) is given as following: p(MPa)=192×(ν_p-1085)-21.8, 1085 cm^-1 < ν_p<1090 cm^-1。

The lots of data of mushroom cloud width were analyzed by numerical method. The new concept, dilating velocity of mushroom cloud of nuclear exploding, was put forward. The function relation between the dilating velocity and the nuclear exploding yield was set up. The new detecting method based on this function relation was established. It was tested and verified by the data of nuclear tests that the relative errors of the detecting results of this method are not exceeding 3%.

The control system of a hexa-orientation press is consisted of measurement and control units for high pressure and high temperature. By applying the configuration software, the precision of tracking control and temperature and pressure maintainenance have reached or exceeded original projects under the guarantee with remarkably shortening period of design and saving invest on project. Through this approach, the direct comparison and auto-convert of inner temperature vs. heating power and inner vs. outer pressure of the load bulk were realized; the locale data were analyzed with online database after the event; and remote device controlling and teledata accessing are convenient to realize.

The most materials have the positive strain-rate sensitivity, the yield stresses of which will increase with the strain-rate increasement. However, based on the dynamic experiments we found that the Al-Li alloy has the negative strain-rate sensitivity and the impact ductility. In this paper, by means of the gas gun experiments, the free-surface velocity history and other related parameters are measured, and the D-u Hugoniot curve of Al-Li alloy is obtained. The experiments reveal that under the impact loading the double wave structure similar to that in elastoplastic materials will occur in this strain-rate sensitive material, which shows that our concept about “the material of limited negative strain-rate sensitivity” is reasonable. Finally, under the hypothesis of weak shocks, we deduced the relationship between the D-u Hugoniot curve and the Murnagham equation, and the parameters of Murnagham equation of Al-Li alloy are obtained based on the experimental data.

We employ quantum path-integral Monte Carlo method to investigate the pressure and temperature effects on the system of Li in solid D₂. Our results show that under high pressure (0.9~2.4 GPa), when the lithium atom doped into solid D₂, it will occupy five-vacancy trapping site. Application of temperature can not change this fact. Pressure and temperature effects on the Li atomic absorption spectrum of Li in solid D₂ are similar to the results of Li in solid H₂. However, at a given pressure and temperature point, the difference between the two kinds of absorption spectrum is significant. With the increase of pressure or temperature, the difference between the two kinds of absorption spectrum is getting less visible.