Study of High-Performance Chloroprene Sponge in Diving Suit Application
A diving-suit-used foam neoprene with high performance has been developed and its aging behaviors in QUV accelerated aging tank and temperature cyclic chamber were investigated. The results show that the tensile strength and tear strength of the material are decreased after 9d QUV accelerated aging due to the obvious cracks in the foaming cell. In temperature cycling the mechanical properties increased arising from cross linking reaction in the aging process. Besides, the chloride ion penetration resistance of the material was tested by dielectric flux intelligent tester, and the result shows that the material is of excellent chloride ion penetration resistance capability. The infiltration coefficient is 8.1×10-11cm2/s.
Experimental study on chloride ion permeability of Crumb Rubber Concrete
Crumb Rubber Concrete(CRC),also called Rubberized Concrete,is developed by replacing a portion of aggregates with shredded worn-out automobile tire particles in Portland cement concrete.The chloride ion penetration in CRC with different amount of rubber particles up to 100kg/m~3 in volume,is investigated by following the ASTM C 1202-97 method.The results show that the charge passed through CRC is typically in the order of 1000C,and is considered very low according to ASTM C 1202-97 standard.It is noticed that the charge decreases as the crumb rubber increased in CRC.
Research on Application of Information Technology and Mathematical Modeling in Precision Agriculture
Abstract:  This paper analyses the principle and development potential of Precision Agriculture, then provides the elementary scheme of Precision Agriculture in China based on applied mathematical model and information technology.