توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Efficient laser induced breakdown in water by double pulses
اطلاعات انتشار: سیزدهمین کنفرانس مهندسی پزشکی ایران، سال
تعداد صفحات: ۸
It is shown experimentally and by simulation that, the induced breakdown threshold in water by double laser pulses requires less energy than a single pulse, and the delay time between two pulses is the key factor. In this study first, parameters of the simulation are chosen by comparing the predictions with the experimental results, then by applying the same pulse generation method and photon matter interaction mechanisms, the double pulse laser induced breakdown (LIB) threshold is simulated and the optimized delay time between two pulses is predicted. Finally, by using a Q–switched Nd–YAG Laser, the optimized delay time for a 10 nanosecond (ns) pulse has been investigated experimentally.<\div>

۲Nano–Scale Simulation of laser induced breakdown threshold in water
اطلاعات انتشار: چهاردهمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۶
In this paper, we have focused on breakdown threshold intensity of fast laser pulses interactions with matter. The selected material is water ,since it's an estimation of eye cornea in laser surgery .For the theoretical analysis we've used Quantum–Photonics model in nano–scopic and atomic scales. Simulation contains different time scales. First of all, energy injection during the Laser pulse, second collisions and the final stage is heat diffusion from focal point to neighbor sites. During the simulation, photons are traced down through the different layers of matter. For each layer probability of photon absorption, molecular ionization and molecular dissociation are investigated for different time scales. Results are fairly well comparable with experimental results from other centers. Also Plasma shielding and molecular dissociation have been observed.<\div>

۳Acoustical Localization of Small Leakage in gas pipes by Regional Residual Complexity: A Fast Robust Method
اطلاعات انتشار: سومین کنفرانس بین المللی رویکردهای نوین در نگهداشت انرژی، سال
تعداد صفحات: ۱۰
Leak detection and localization are critical issues in gas transportation and gas distribution industry. Small leakages can be determined and localized by NDT techniques that makes saving process more safely. In this paper, time delay estimation using regional and global similarity measure based on residual complexity is employed for acoustical leak detection. As a similarity measure, the residual complexity (RC) leads to robust time delay estimation against correlated noises as well as low samples number. Although, the RC essentially, considers global interdependency in the sequence of signals, the regional interdependency can be employed because the leakage signal is not long range correlated. The sensitivity of regional method to length of window and controlling parameter is investigated. This approach yields robustness as well as calculation simplicity which is useful for leak detection in distribution networks with huge amount of calculation.<\div>
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