Précis: Glass composition of individual agglutinate grain is determined largely by the composition of a few soil grains, heterogeneous with respect to the bulk soil, impacted by a micrometeorite. Common perception or consensus: Lunar agglutinates form upon micrometeoritic bombardment of lunar soils and consequent preferential melting of the (otherwise homogeneous) finer fraction, scavenging unm...

The aim of this study is to evaluate the biodegradation performance of phenol in a fixed biofilm developed in sand soil media. The parameters which had been studied and may influence the biodegradation were: a) the grain size of sand, b) the rate of flow, and c) the initial phenol loading. Laboratory scale of two columns with inner diameter of 5 cm was used. The first column was packed with fin...

Parallel Constrained Delaunay Mesh (PCDM) is a 2D adaptive and irregular meshing algorithm. In PCDM one can explore concurrency using three different levels of granularity: (i) coarse-grain at the sub-mesh level, (ii) medium-grain at the cavity level and (iii) fine-grain at the element level. The mediumand fine-grain approaches can be used to improve the single-processor performance of coarse-g...

this paper describes the results of a study which was primarily directed to the determination of geotechnical properties of fine and coarse grain soils stabilized by lime obtained from taleghan, northwest of tehran to assess its suitability as construction material. soils were treated with lime mixtures in various portions between 3 to 9 percents by weight. the samples were cured for different ...

A supervised feature selection algorithm was applied to determine the most important features contributing to wheat grain yield. Four hundreds seventy two fields (as records) from different parts of Iran which were different in 21 characteristics (features) were selected for feature selection analysis. Selection of the wide range of features, including location, genotype, irrigation regime, fer...

Mercury (Hg) stored in vegetation and soils is known to be released to the atmosphere during wildfires, increasing atmospheric stores and altering terrestrial budgets. Increased erosion and transport of sediments is well-documented in burned watersheds, both immediately post-fire and as the watershed recovers; however, understanding post-fire mobilization of soil Hg within burned watersheds rem...

Soil creep is the most widespread and perhaps the least understood process of erosion on soil-mantled hillslopes. Soil is slowly ‘‘stirred’’ by burrowing creatures, and particles are displaced in wetting-drying cycles. These actions can cause downslope creep by processes analogous to particle diffusion. Other possible transport mechanisms include shear and viscous-like creep, such that precise ...

In fine–grain multithreading, the thread changes in each processor cycle, consecutive instructions are thus issued from different threads, and no data dependencies stall the pipeline. Enhanced fine–grain multithreading maintains a number of additional threads which are used to replace an active thread when it initiates a long–latency operation. Performance improvements due to enhanced multithre...

Tillage practices significantly influences soil physical characteristics and crop productivity. The infiltration characteristics, bulk density, porosity, penetration resistance, grain yield of rice and wheat were measured under no-till without residue (NT), roto-tillage (RT), and no-till with residue i.e. happy seeder (HS) in rice-wheat cropping system in sandy loam (SL) and loamy sand (LS) soi...