Study on the EMD Processing Method of Cylinder with Multiple Diagonal Slits
Aiming at complex shape of cylinder with multiple diagonal slits and difficult to processing using traditional processing method. the paper adopt two methods of EMD shaping and trajectory to processing slits of cylinder with multiple diagonal slits. Compared the processing quality of two processing method by the following aspects, such as the electrode material and fabrication technology, the level of difficulty with control of slits processing and Factors determine the accuracy of slits and so on. As can be seen from the comparison, for EDM forming method, processing electrode complex and inconvenient, but the process is simple relatively, have no use for complicated electrical control. For EDM trajectory method, processing electrode is simple and convenient, but the process is complicated relatively. It can process slits closer to the ideal shape through the establishment of a precise trajectory equation and using complicated electrical control.
One-dimensional longitudinal-torsional vibration converter with multiple diagonally slitted parts
For increasing the available vibration velocity of the one-dimensional longitudinal-torsional vibration converter, a new type of complex vibration converter with multiple slitted parts installed in the positions avoiding longitudinal nodal positions along the converter for decreasing the maximum vibration stress level at the vibration nodal part was studied. The free end of the converter vibrates in an elliptical or circular locus. Complex vibration systems with elliptical to circular or rectangular to square loci can be applied effectively for various high-power applications, including ultrasonic welding of metal or plastics, ultrasonic wire bonding of IC, LSI and electronic devices, and also ultrasonic motors. The converter with multiple slitted parts was improved in the vibration stress level and the quality factor compared with the converter with single slitted part.
New Organic Material of Bis(benzylidene)cycloalkanone Derivatives for Efficient Optical Second-Harmonic Generation
We have synthesized a series of bis(benzylidene)cycloalkanone derivatives with up to 30 members, and examined their conversion efficiencies of second-harmonic generation (SHG) and related characteristics. As a result, we find that a few derivatives exhibit prominent features in SHG. That is, 2,5-bis(4-methylbenzylidene)cyclopentanone, 2,5-bis(4-bromobenzylidene)cyclopentanone and 2,7-bis(4-methylbenzylidene)cycloheptanone are 30, 20 and 16 times more efficient in SHG, respectively than urea, and they presumably satisfy the criteria required for practical application, concerning phase matching, cutoff wavelength, stability and laser-power tolerance. The crystallographic structures of a few typical compounds are also presented. Furthermore, the difference in effectiveness of the present design principle compared with conventional ones is discussed.