It is a promising and new technology to apply welding with trailing peening to control welding stress and distortion of titanium alloy.Numerical simulation of conventional welding and welding with trailing peening of ...It is a promising and new technology to apply welding with trailing peening to control welding stress and distortion of titanium alloy.Numerical simulation of conventional welding and welding with trailing peening of the titanium alloy sheet is carried out,using nonlinear finite element theory and the engineering analysis software MARC.The result shows that welding with trailing peening technology reduces longitudinal residual stress in welding joint effectively,and it is more effective to reduce residual stress to peen the weld than to peen the weld toe.It is a effective result that other technology and method used in welding can never achieved.展开更多
The growing market of WPAN has led to an increasingdemand of security measures and devices forprotecting the user data transmitted over the openchannels.Advanced Encryption Standards(AES)isthe basic security approach ...The growing market of WPAN has led to an increasingdemand of security measures and devices forprotecting the user data transmitted over the openchannels.Advanced Encryption Standards(AES)isthe basic security approach for WPAN.To meet thelow cost,low power feature and high security demandof WPAN,a low cost,high efficient AES coreis proposed in this paper.To achieve low cost,methods of integration and resource sharing are usedin designing a very low-complexity architecture,especially in(inverse)byte substitution(inv)SubBytes)modules and(inverse)mix column(inv)MixColumn)modules,etc.Further more,AESEncryptor and Decryptor is integrated into a fullfunctional crypto-engine.This very low-cost andhigh efficiency AES core of IEEE 802.15.4-2006 isdesigned and emulated on Xilinx FPGA.Simulationresults show that this kind of design can be used inresource critical applications,such as smart card,PDA and mobile phones.展开更多
文摘It is a promising and new technology to apply welding with trailing peening to control welding stress and distortion of titanium alloy.Numerical simulation of conventional welding and welding with trailing peening of the titanium alloy sheet is carried out,using nonlinear finite element theory and the engineering analysis software MARC.The result shows that welding with trailing peening technology reduces longitudinal residual stress in welding joint effectively,and it is more effective to reduce residual stress to peen the weld than to peen the weld toe.It is a effective result that other technology and method used in welding can never achieved.
文摘The growing market of WPAN has led to an increasingdemand of security measures and devices forprotecting the user data transmitted over the openchannels.Advanced Encryption Standards(AES)isthe basic security approach for WPAN.To meet thelow cost,low power feature and high security demandof WPAN,a low cost,high efficient AES coreis proposed in this paper.To achieve low cost,methods of integration and resource sharing are usedin designing a very low-complexity architecture,especially in(inverse)byte substitution(inv)SubBytes)modules and(inverse)mix column(inv)MixColumn)modules,etc.Further more,AESEncryptor and Decryptor is integrated into a fullfunctional crypto-engine.This very low-cost andhigh efficiency AES core of IEEE 802.15.4-2006 isdesigned and emulated on Xilinx FPGA.Simulationresults show that this kind of design can be used inresource critical applications,such as smart card,PDA and mobile phones.
