[en] A method has been described for the noncontact ultrasonic imaging of subsurface defects, using a concentric pulsed laser-annular Electromagnetic Acoustic Transducer (EMAT) system. The linear scane data of this system were processed to reconstruct images using the two-dimensional Synthetic Aperture Focussing Technique (SAFT). The result show that this system can accurately be used for imaging by slightly modifying the basic SAFT algorithm. (author). 18 refs, 10 figs

[en] A q-switched ruby laser ultrasonic source concentric with an annular electro-magnetic acoustic transducer (EMAT) as a detector, working in a pulsed-echo system, have been used to inspect titanium diffusion bonds for nuclear reactor spent fuel containers. The detected waveforms were analyzed with cepstral analysis to indicate the effectiveness of diffusion bonding. The results show that they are in good agreement with those of the conventional immersion testing. (authors). 20 refs, 8 figs

[en] A method has been described for the noncontact ultrasonic thickness measurements of thin aluminium sheets, using a Q-switched ruby laser generation concentric with an annular electro-magnetic acoustic transducer (EMAT) detection to imitate pulse-echo system. The detected waveforms were analyzed with the cut-off frequences of the higher order lamb modes. The results show in a good egreement with micrometer measurements within 2% discrepancy. (authors). 22 refs, 6 figs

[en] Synthesis of polyol from Bintaro seed oil (Cerbera manghas L.) as base lubricant through epoxidation and opening oxirane ring directly has been carried out. The results showed that polyol can be synthesized from Bintaro seed oil and its FT-IR analysis exhibited the absorption peak typical on wave numbers of 3008.95 cm⁻¹ (C−H sp²) and 1658.78 cm⁻¹ (C=C) with iodine value was 140.66 g Iod/100 g, but polyol has absorption peak typical on wave number of 3417.86 cm⁻¹ (-OH) and iodine value decreased to 2.11 g Iod/100 g. Besides that, another instrument analysis could be done by ascertain compounds of the product as polyol. The percentage of yield of polyol was 92.42%. The results of physical properties test showed that polyol was classified in SAE 250 on axle and manual transmission lubricant viscosity classification based on its characteristics such as kinematic viscosity at 100°C was 54.35 cSt and viscosity index was 111.36. But, its flash point and pour point were not fulfill the quality standard of SAE J306. (paper)