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Dziś i jutro mostów kontynentalnych Azja - Europa

100%

Jingbang Z. , Hua L.

1998

tom R. 37, nr 5

1-5

Zalety kolejowych mostów kontynentalnych i ich konkurencyjność w porównaniu z przewozami drogą morską. Nowy eurazjatycki most kontynentalny, jego rola w obsłudze handlu zagranicznego Chin i tranzytu. Zaangażowanie Chin w rozbudowę ich odcinka mostu, aby mógł sprostać potrzebom tranzytowym. Propozycja ścisłej współpracy i koordynacji działań wszystkich krajów, przez które przebiega nowy most kontynentalny

The effect of electromagnetic stirring on the microstructure and corrosion of mischmetal modified AZ91D magnesium alloy

80%

Jin Y. X. , Hua L. , Xu X. , Peng Q.

tom Vol. 27, No. 1

171--185

The microstructure and corrosion behaviour of mischmetal modified AZ91D magnesium alloy in the presence or absence of a rotating electromagnetic field have been investigated. The study suggests that the size and volume fraction of the ? (Mg17Al12) phase in the alloy decreases as magnetic field intensity increases. The immersion test results show that the mass loss for the alloy solidified in the absence of a magnetic filed is always larger than that for the alloy solidified under magnetic field. The electrochemical corrosion experiments indicate that the corrosion potential of the alloys increases from -1.56 to -1.51 V, while the corrosion current density decreases from 6.31 to 1.58 mAocm-2, and the charge transfer resistance increases from 3.17 to 11.32 k?ocm2 as the excitation voltage increases from 0 to 120 V. The enhancement of the corrosion resistance is attributed to the grain refinement, and to the volume fraction reduction of the ? (Mg17Al12) phase under a rotating electromagnetic field.

Initiation Capacity of a New Booster Pellet

80%

Hua L. , Hu S. , Cao X.

Central European Journal of Energetic Materials

2014

tom Vol. 11, no. 1

157--170

Insensitive munitions improve the survivability of both weapons and their associated platforms. All weapon systems contain an explosive train which needs to meet the insensitive munitions criteria but also to reliably initiate the main charge explosive. The traditional cylindrical booster pellet has insufficient energy output to reliably initiate an insensitive main charge explosive. To ensure that this requirement can be achieved, a new highly effective booster charge structure was designed. New booster pellets of four different sizes were investigated by numerical simulation and the one with the most powerful output was selected for experimental study. The results show that the new booster pellet has more initiation capacity than a cylindrical booster pellet with the same mass and pressed density. The convergence pressure of the new booster pellet is much higher than that of a cylindrical booster pellet with the same density.