Filter is an important subassembly of instantaneous optical pyrometer system, and the parameters of filter have serious influence on performance of optical pyrometer. In this paper, the influence of filter's bandpass half width, background transmittance and peak transmittance on the channel linearity had been discussed. The results of calculation indicate that the filter's parameters have greater influence on channel linearity. The results provide reference for selecting proper filter in design of high-performance optical pyrometer.

The extended penetrator penetrating single layer and two-layer spaced targets with attack angle were simulated with LS-DYNA3D, which were compared to that of the baseline rod with the same mass and outer radius. The variation of kinetic energy with time were obtained for extended penetrator and baseline rod respectively. It was demonstrated that the attack angle, velocity and target delamination have effects on the ability of extended penetrator penetrating targets. The advantage of extended penetrator is obvious at high velocity or little attack angle. When the space of the targets equals to the length of the baseline rod, the influence of the target delamination on the penetrating power of expended penetrator is weak, but the influence on the baseline rod is strong, which indicates that the ability of the extended penetrator penetrating two-layer spaced targets is stronger than that of baseline rod.

A few questions on the spallation behavior resolved by the measurement of free-surface velocity profile have been discussed. Firstly, the way from the measured free-surface velocity profile to infer the dynamic damage behavior of the target is an “Inverse Problem” and the theoretical model and simulation parameters determined by such a solution maybe not represent the real physical nature of spall fracture inside the target. Secondly, how to calculate the spall strength? Due to the attenuation effect of micro-voids or damage on the wave propagation, the spall strength computed from the free-surface velocity profile is apparently lower than the tensile strength suffered by the shocked material. Thirdly, limitation of the traditional single-point measurement on the free-surface velocity profile is briefly reviewed. Given that the shocked target is inhomogeneous, the amplitude of the measured velocity profile is varied from point to point. According to these discussions, future research suggestions have been proposed in order to clearly understand the spallation behavior.

With nanometer SiO₂ powder as initial material, the p-T phase diagram (2.0~4.2 GPa, 150~1 200 ℃) of α-quartz and coesite was obtained by a series of experiments under high pressure and high temperature, and the slope of the boundary in the phase diagram is negative below 650 ℃ and is basically horizontal above 650 ℃. By means of transmission electron microscopy (TEM), X-ray diffractometer (XRD), Raman spectrometry (Raman), fourier transform infrared spectrometry (FT-IR), thermogravimetry and differential thermal analysis measurements (TG-DTA), the phenomenon that the water in the nanometer SiO₂ can decrease the synthesis temperature of coesite and quicken reaction velocity was found, and the nanometer SiO₂ can be crystallized into coesite under 4.2 GPa and 190 ℃, which is much lower than the synthesis temperatures of coesite that have been reported. Under ambient pressure, the coesite synthesized from nanometer SiO₂ can stably exist at 800 ℃ and is transformed into cristobalite above 1 000 ℃.

With a simple multi-phase mixture model proposed by TANG Zhi-Ping et al earlier, we have studied the propagation of the elastic and plastic waves as well as the macroscopic phase boundary in the targets by characteristic line method, and the mechanism of the abnormal spall phenomena mentioned above are explained theoretically. The investigation shows that (reverse) phase transition can strongly affect the profiles of the shock waves, leading to the so-called three-wave structure and the release shock waves, and the static phase boundary may appear somewhere in the plates. The more complex interactions of the waves in the plates may cause some special spall phenomena.

The effect of thickness of diamond layer on the residual stresses in polycrystalline diamond compact (PDC) was investigated through XRD measurement and finite element analysis (FEA) method. The results show that as the thickness of the diamond layer increases from 0.5 mm to 2.0 mm, the residual compressive stress on the surface of the diamond layer at the center decreases from 1 800 MPa to about 700 MPa, but the stress on the edge changes gradually from compression into tension, and the tensile stress region on the edge of the diamond layer becomes wider. At the same time, the vertical tensile stress on outer edge of the cutter and shear stress near the interface increase significantly. These two stresses are the main factors that cause cracks near the interface of the PDC with a thicker diamond layer. Based on the measured results, the equations of the stresses at the centers and on the edges of the PDC as a function of the thicknesses of diamond layers have been deduced.

We have investigated the mechanism and electromagnetic properties of new compound Sr₈CaRe₃Cu₄O₂₄ under the hydrostatic pressure by the mean of local spin density approximation and mean field theory. Then we have discussed the internal mechanisms of the high magnetic transition temperature (T_C) and the regularity of T_C with the variety of hydrostatic pressure of this compound. Our calculation shows that the value of the magnetic transition temperature increases and the width of gap around Fermi level in DOS of this material descreases with the increasing of pressure. Our results show that a simple Heisenberg model and the theory of orbital order is suitable for this compound.

The distribution of micro-voids in aluminum under shock loading has been investigated by means of SEM (Scanning Electron Microscope) and TEM (Transmission Electron Microscope). Results show that plenty of nano-voids have been produced in the shocked aluminum. Most of the void sizes are hundred nanometers. They distribute inhomogeneity, and connect together as a band. Further analysis of the micro-voids indicate that a lot of dislocations are generated around the voids, and the emission direction is in the {111} planes, which are the closed-packed planes of the face-centered cubic metal. The emission direction of the dislocations is excellently agreement with the molecular dynamics (MD) simulation.

Skutterudite compounds Na-filled CoSb₃ were successfully synthesized at high-pressure using powders of Co, NaN₃ and Sb as starting materials. The X-ray diffraction (XRD) results indicate that all samples have the single phase CoSb₃. No secondary phase is found when Na content w_Na≤80%. The composition-dependent electric transport properties of Na-filled CoSb₃ have been studied at room temperature. The Seebeck coefficient decreases with increasing Na content. The electrical resistivity decreases with increasing Na content. In this study, the obtained maximum power factor reaches 8.72 μW·cm^-1·K^-2 when Na content is 40%.

The thermo-mechanical response of zirconium has been investigated under temperature ranging from normal temperature to 1 073 K and strain rate from 4.1×10^-4 s^-1 to 2.8×10³ s^-1. Results show that the flow stress and strain hardening rate of zirconium are very sensitive to the changes of temperature and strain rate. The flow stress and strain hardening rate increase with the increase of strain rate, and decrease with the increase of temperature. Based on the concept of dislocation kinematics, a physically based constitutive model is developed, and the model is modified by taking into account of the effect of developing twins during deformation. The modified model could be used to predict the flow stress of zirconium over a wide range of temperature and strain rates. The experimental results are in good agreement with the predictions.