Pathological changes of lumbar spinal cord in rabbits after sciatic nerve injury by firearm;

The firearm in the northern frontier of Ming Dynasty: its use and limitation;

The authors of this paper point out that it is a mistake to think that Xi-Fa-Shen-Ji and Huo-Gong-Qie-Yao,two firearmliteratures in the end of Ming dynasty,are derived from western and introduced the western firearm-technology.

In the 18 th century,the West has already made preliminary progress in the firearm production,whereas China lags behind,arming its troops with a combination of cold casting weaponry and few firearms,mainly consisting of bows,arrows,spears,and matchlocks.

This dissertation studies the status of gunpowder in the history in Ancient China by investigating the performance of powder formulas, the development of firearms, the powder products for civil use as well as the advantages and disadvantages of the application of gunpowder in Song Dynasty.

Study of the influence of environment to the performance of ramjet ignition device;