نتایج جستجو برای: soil attenuation
تعداد نتایج: 229138 فیلتر نتایج به سال:
Introduction: Data collected by the Mars Gamma Ray Spectrometer (GRS) orbiting aboard the 2001 Mars Odyssey spacecraft indicates that the global distribution of chlorine on Mars is heterogeneous [1]. The GRS 50% footprint has a diameter of ~440 km for low energy Cl lines and ~540 km for high energy Cl lines, however smoothing with a 10-degree radius filter is required to improve signal to noise...
Abstract The effect of the foundation heterogeneity on mechanical behaviour a beam Vlasov soils is discussed. According to refined soil model, static problem beams lying transversely isotropic can be solved by an iterative method. In this paper, based energy variational principle, differential equations for under axial force foundations are derived. methods solving internal forces and deformati...
The term “Natural Attenuation” (NA) has been defined as “naturally occurring processes in soil and groundwater environments that act without human intervention to reduce the mass, toxicity, mobility, volume, or concentration of contaminants in those media” (Wiedemeier et al., 1999). This popular definition goes on to mention that the “in-situ” processes of NA include biodegradation, dispersion,...
development of ultrasound technique has not been progressing for evaluating the internal quality of fruits as fast as that of processed foods. in this research for quality assessment of pear fruit (shah miveh variety) an ultrasonic measurement system was constructed to transmit and receive the ultrasonic waves. the apparatus included a pulser-receiver, a pair of 75 khz ultrasonic transducers wi...
The article presents an analysis of the dynamic response underground main pipeline under action a longitudinal wave, propagating in soil along pipe. It is assumed that elastic pipe has finite length. A linear viscoelastic model "pipe-soil" system interaction considered. influence pulse form triangle on deformed state investigated. comparative results obtained for some values coefficients and vi...
European beech forests growing on marginal calcareous soils have been proposed to be vulnerable to decreased soil water availability. This could result in a large-scale loss of ecological services and economical value in a changing climate. In order to evaluate the potential consequences of this drought-sensitivity, we investigated potential species range shifts for European beech forests on ca...
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