نتایج جستجو برای: flows and movement coarse
تعداد نتایج: 16861921 فیلتر نتایج به سال:
virtual water adds a new dimension to crop trades and provides a new way of thinking about water scarcity. a systematic analysis of virtual water flows requires integration of all critical drivers of virtual water flows under a single consistent framework. the aim of this study was to assess virtual water flows related to trades of grain crops (wheat, corn, rice, and coarse cereals) and their i...
the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...
in this work we introduce and study discrete time periodically correlated stable processes and multivariate stationary stable processes related to periodic and cyclic flows. our study involves producing a spectral representation and a spectral identification for such processes. we show that the third component of a periodically correlated stable process has a component related to a...
Abstract Thermospheric waves occurring around the time of the 14 July 2000 solar flare were investigated using the Global Ionosphere and Thermosphere Model. The simulation results showed that extensive acoustic and gravity waves were excited by the solar flare in the subsolar region. The subsolar buoyancy period at 400 km altitude was approximately 16 min. Gravity waves with frequencies lower t...
Since paying over or not paying dividends can cause the firms to face financial crises, firms are always looking for discovery and using a target (optimal) dividend payout ratio. It should be noted that a dividend ratio is a dynamic number and a variety of factors affect it over time. The movement speed of the dividend payout ratio towards the target depends on several factors. This paper inves...
drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...
We describe the development of a hierarchic modelling method applied to simulating the processive movement of the myosin-V molecular motor protein along an actin filament track. In the hierarchic model, three different levels of protein structure resolution are represented: secondary structure, domain, and protein, with the level of detail changing according to the degree of interaction among t...
Debris flows are common geological hazards in mountainous regions worldwide. The scale of debris can be significantly enhanced by basal erosion and bank collapse the transportation process, resulting an increase casualties property losses. However, mechanisms this growth largely unclear. Here, we conduct a series experiments to investigate two different bed sediments (coarse-grained widely grad...
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