Abstract: An unmanned aircraft traction control system without a traction rod and an intelligent tractor relate to the technical fields of aircraft ground motion and man-machine coordination. The traction control system includes an aircraft light identification and induction module, a main sensing system module, an aircraft sound identification and induction module and a control module which are arranged on the tractor. When the tractor and an aircraft carry out a wheel holding operation, the aircraft light identification and induction module, the main sensing system module and the aircraft sound identification and induction module acquire a brightness signal of an aircraft nose landing gear taxi light, an aircraft turning signal, an aircraft resistance signal and an aircraft horn signal autonomously transmitted by a pilot. The purpose that a pilot autonomously controls the tractor to pull an aircraft to an aircraft parking position or a designated taxiway position is realized through the above signals.

Abstract: An unmanned aircraft traction control system without a traction rod and an intelligent tractor relate to the technical fields of aircraft ground motion and man-machine coordination. The traction control system includes an aircraft light identification and induction module, a main sensing system module, an aircraft sound identification and induction module and a control module which are arranged on the tractor. When the tractor and an aircraft carry out a wheel holding operation, the aircraft light identification and induction module, the main sensing system module and the aircraft sound identification and induction module acquire a brightness signal of an aircraft nose landing gear taxi light, an aircraft turning signal, an aircraft resistance signal and an aircraft horn signal autonomously transmitted by a pilot. The purpose that a pilot autonomously controls the tractor to pull an aircraft to an aircraft parking position or a designated taxiway position is realized through the above signals.

Abstract: A support suitable for catalyst having a surface area in the range of from 80 to 200 m.sup.2 /g, a pore volume of from 0.3 to 0.5 ml/g, a side compression strength of from 70 to 240 N/cm and a pore diameter of from 60 to 200 Angstom units. The support contains from 60% to 100% by weight titania (TiO.sub.2) and from 0% to 40% by weight alumina (Al.sub.2 O.sub.3). The support is produced by raw material of titania. The invention also provides process for producing said support and catalyst employing the same.