نتایج جستجو برای: acoustic wave amplification
تعداد نتایج: 345588 فیلتر نتایج به سال:
Lasing is a well-established field in optics with several applications. Yet, having lasing or huge amplification other wave systems remains an elusive goal. Here, we utilize the concept of coherent perfect absorber-laser to realize acoustic analog laser proven more than 10 4 terms scattered signal at frequency few kHz. The obtained (or absorber-laser) shown possess extremely high sensitivity an...
In this paper, we report on the amplification by polymerase chain reaction (PCR) of a 509 base sequence unique to E. coli O157:H7. Immobilization of a probe for the bacterium on an acoustic wave sensor by the biotin-neutravidin interaction was employed to detect the on-line hybridization of the sequence with the sample obtained from PCR. The limit of detection was found to be 10(-8) M, which su...
In the present work we investigate receptivity and disturbance amplification behind a circular roughness element in a zero-pressure-gradient flat-plate boundary layer with the aim to identify and understand the basic mechanisms at work. The low disturbance background and the high repeatability of the direct numerical simulations allow to evaluate the different contributions of acoustic-roughnes...
Three–wave nonlinear resonant interaction (TWRI) is typically encountered in the description of any conservative nonlinear medium where the nonlinear dynamics can be considered as a perturbation of the linear wave solution, the lowest–order nonlinearity is quadratic in the field amplitudes, the three–wave resonance can be satisfied [1]. Indeed TWRI is the lowest–order nonlinear effect for a sys...
Application of PCR to multiplexing assays is not trivial; it requires multiple fluorescent labels for amplicon detection and sophisticated software for data interpretation. Alternative PCR-free methods exploiting new concepts in nanotechnology exhibit high sensitivities but require multiple labeling and/or amplification steps. Here, we propose to simplify the problem of simultaneous analysis of...
چکیده ندارد.
Slow magneto-acoustic waves are often observed in polar plumes and active region fan loops. The observed periodicities of these waves are in the range of 1- 40 minutes. Mainly, the ratio of damping time to the oscillation period is less than 2 (equal to the ratio damping length to the wave length), which corresponds to the strong damping regime. In general, slow magneto-acoustic waves can be da...
Porous materials have good acoustic damping characteristics over a wide frequency range. As for sound waves, many small-scale pores in the coating materials can convert underwater-coating to rough surfaces. The main property of porous absorbents is their resistance against incident sound wave that leads to damping effect. From a physical point of view, damping occurs due to friction between flu...
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