Straw checkerboard barrier (SCB) is the most representative antidesertification measure and plays a significant role in antidesertification projects. Large-eddy simulation and discrete-particle tracing were used to numerically simulate the wind sand movement inside the straw checkerboard barrier (SCB), study the movement characteristics of sand particles, find the transverse velocities of sand ...

We study the evolution of a one-dimensional pile, empty at rst, which receives a grain in its rst stack at each iteration. The nal position of grains is singular: grains are sorted according to their parity. They are sorted on trapezoidal areas alternating on both sides of a diagonal line of slope p 2. This is explained and proved by means of a local study. Each generated pile, encoded in heigh...

The harvester termite, Baucaliotermes hainesi (Fuller) (Termitidae: Nasutitermitinae), is an endemic in southern Namibia, where it collects and eats dry grass. At the eastern, landward edge of the Namib Desert, the nests of these termites are sometimes visible above ground surface, and extend at least 60 cm below ground. The termites gain access to foraging areas through underground foraging tu...

Physician to the Bristol General Hospital. I have recently attended two patients both of whom passed gallstones , and both of whom noticed a quantity of fine gritty sand in their stools for several days and even weeks during the time that the stones were passing. The stones were of the ordinary type, facetted, varying in size from a hemp seed to a pea, and composed almost entirely of cholesteri...

Abstract— In recent days the demand for river sand is increasing due to its lesser availability. Hence the practice of replacing river sand with M-Sand is taking a tremendous growth. It is also inferred from the literature that replacement of normal sand with M-Sand produces no appreciable increase in compressive strength due to the variation in the pore size of concrete at micro level. This pa...

Sediment deprivation from dam installments contributes to beach erosion yet the underlying physical and economic factors linking them together have traditionally been isolated during regional planning. In order to gain a better understanding of the behavior of a managed beach system, a dynamic simulation model was developed incorporating physical and monetary factors influencing the amount of a...

Percentage of gravel and sand to all aggregates for concrete is decreasing, but yet large amount them has been used in Japan. In this report, the history test methods fines, organic impurities, lightweight particles, clay lumps soft pebbles as deleterious substances was investigated. As result survey, it confirmed that above Japan were established on basis ASTM then they developed their own way...

Ionotronics An hourglass measures time by a regulated flow of sand through narrow neck. In article number 2213677, Jianyu Li and co-workers show that with similar shapes, ionic junctions regulate ion flow, allowing unidirectional current conduction. Like in an hourglass, microgels can be the building blocks such ionotronics to achieve printability tough mechanics. The are critical elements worl...

Sandstorm has an effect on the electric field characteristics of outdoor insulator, and may result in flashover. The analysis of the electric field characteristic of insulator under sandstorm condition is very important. The electrostatic field finite element method (FEM) is used to calculate the electric field distribution along long rod insulator under sandstorm condition with FEM software. T...

our aim in this paper is to introduce the notion of fuzzy soft near-subtraction semigroupsand fuzzy soft ideals of near-subtraction semigroups. we discuss some important properties of these new fuzzy algebraic structure and investigate some examples and counter examples.