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Get the influence of shooting on the ballistic elements and correction elements of grenade under the condition of extra-large elevation difference between artillery and target in plateau area through simulation, and drawn the comparison chart of different altitude and elevation difference between artillery and target by using the simulation data. Calculate the variation characteristics of the hit range of laser terminal guided projectile under the condition of the elevation difference of extra-large elevation difference between artillery and target at different altitudes, and the influence of altitude and extra-large elevation difference between artillery and target on the hit range of laser terminal guided projectile is analyzed and summarized. It has a certain reference value for improving the shooting accuracy under the condition of high altitude and extra-large elevation difference between artillery and target.

Lithium-sulfur battery is expected to become a new generation of commercial battery owing to its ultra-high theoretical specific capacity, low-cost, and environmental benign. However, the inherent insulation of sulfur and the shuttle effect of lithium polysulfide between electrodes limit the application of lithium-sulfur battery. In order to solve these problems, we focus on the design of carbon-sulfur composite structure. Herein, CS-CNTs homojunctions featured with the carbon nanotubes (CNTs)in situgrown on carbon sphere (CS) is designed and synthesized by simple polymerization and heat treatment. The composites of CS with interconnected pore networks and CNTs with high conductivity not only offer a conductive framework to promote fast electron transmission, but also provide a larger space to load sulfur and effectively capture polysulfides. The CS-CNTs@S cathode shows better electrochemical performance compared with CS-CPs@S and CS@S. The first discharge specific capacity is 1053 mAh g-1at 0.1 C. After 200 cycles, the specific capacity still remains at 427 mAh g-1.

As a renewable energy source, water energy is indispensable in hydropower generation, and centrifugal pump is widely used in hydroelectric generation. But the centrifugal pump usually uses elbow pipe inflow due to the limitation of installation space, and the inflow distortion will lead to the decrease of pump performance and the increase of vibration. In this paper, the influence rule of inflow distortion on external characteristics and pressure pulsation of centrifugal pump was analyzed. The research results show that the inflow of elbow pipe will lead to the decrease of the head and efficiency of the centrifugal pump, which will decrease by 0.68m and 1.5% at the maximum under the design condition. The increase of bend angle will increase the pressure pulsation at the inlet of the centrifugal pump, which has an influence on the pressure pulsation around the volute at different positions, especially the pressure pulsation intensity at the tongue position significantly increases. The research in this paper can provide reference for the design and safe operation of inlet pipeline in practical engineering.

The projectile dispersion in the plateau area has increased in various degree and decreased of the fire precision. The analysis shows that it has a considerably relations with altitude and the changes of trajectory characteristics associated with altitude. In order to reflect the change law of external ballistics trajectory characteristic in the plateau area clearly. Simulate compute the trajectory data and changes of projectile attitude in different altitude accord to trajectory model. These research findings will lay a foundation for further research on projectile precision in the plateau.

In traditional artillery shooting, meteorological information is provided by meteorological unit, but because of the inconsistency between meteorological observation sites and shooting sites, there are errors in meteorological data, which affects shooting accuracy. In order to reduce the influence of meteorological data errors on firing accuracy, it is proposed to acquire multi-meteorological data along the ballistic trajectory by using the dropsonde carried by the UAV, and calculate the meteorological data along the ballistic trajectory for artillery firing. Through simulation calculation, using meteorological data along the ballistic for artillery firing can effectively improve firing accuracy.

Aiming at the phenomenon of low firing accuracy and low hit probability of guided projectiles in Plateau area, based on the differential equation of kinematics of guided projectiles, the variation and regularity of hit range at different altitudes are simulated and calculated. The measures to improve hitting accuracy are proposed and simulated.

In this paper a projectile ions-recoil ions coincidence technique is employed to investigate the target ionization and projectile charge state changing processes in the collision of 0.22–6.35 MeV Cq+ (q = 1 – 4) ions with argon atoms. The partial cross section ratios of the double, triple, quadruplicate ionization to the single ionization (or the single capture) of argon associated with single electron loss (or single electron capture) by the projectile are measured and compared with the previous experimental results. In the present experiment, it is observed that the ratios of ionization cross sections R associated with single loss and single capture depend strongly on the projectile charge state and vary significantly with different reaction channels as impact energy increases. In addition, this paper gets empirical scaling laws for the ionization cross section ratios R corresponding to the projectile single loss and finds that the ratios of the double ionization to the single ionization associated with single electron capture remain constant in the present energy range.

L-shell x-ray yields of molybdenum bombarded by highly charged Arq+ ions (q = 11-16) are measured. The x-ray production cross-sections are extracted from the yields data. The energy of the incident Ar ions ranges from 200 to 350 keV. After the binding energy correction, experimental data are explained in the framework of binary-encounter-approximation (BEA). The direct ionization is treated in the united atom (UA) limit (Lapicki and Lichten 1985 Phys. Rev. A 31 1354), not in the separate atom (SA) limit. The calculation results of BEA (Gacia and Fortner 1973 Rev. Mod. Phys. 45 111) are much lower than the experimental results, while the results of binding energy modified BEA are basically in agreement with the experimental results.