نتایج جستجو برای: wave penetration
تعداد نتایج: 252671 فیلتر نتایج به سال:
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Communicators are small handheld devices that combine the features of PDAs and palmtop computers with those of telephones. They are widely believed to be the next big wave of devices to gain market popularity with projected market penetration exceeding that of conventional desktop computers by more than an order of magnitude. Communicators pose special challenges to the design of user interface...
While metals benefit from a strong nonlinearity at optical frequencies, its practical exploitation is limited by the weak penetration of the electric field within the metal and the screening by the surface charges. It is shown here that this limitation can be bypassed by depositing a thin dielectric layer on the metal surface or, alternatively, using a thin metal film. This strategy enables us ...
Ground motions recorded within sedimentary basins are variable over short distances. One important cause of the variability is that local soil properties are variable at all scales. Regional hazard maps developed for predicting site effects are generally derived from maps of surficial geology; however, recent studies have shown that mapped geologic units do not correlate well with the average s...
Transient elastography (TE) is well adapted for use in studying liver elasticity. However, because the shear wave motion signal is extracted from the ultrasound signal, the weak ultrasound signal can significantly deteriorate the shear wave motion tracking process and make it challenging to detect the shear wave motion in a severe noise environment, such as within deep tissues and within obese ...
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