We investigate the gravity driven rapid failure of a granular step composed of noncohesive steel beads. The step is initially held together with electromagnets, and released when the current is switched off. We visualize the surface and the motion of the grains during the entire relaxation. The initial failure occurs at the surface and the subsequent flow is also confined to the surface as the ...

The flow properties of powdery or granular filling substances for dangerous goods packagings are safety-relevant parameters. To specify the behaviour, angle repose is measured in recognized test centres Germany. Previous investigations performed on non-hazardous revealed that some methods currently used have disadvantages application. Additionally, occupational health and safety reasons, it was...

To improve the accuracy of parameters used in discrete element simulation tests process clearing fresh sunflowers, this study took extracts sunflower as research object and a combination physical experiments to calibrate parameters. First, composition edible extract is determined, then, test method determine characteristics material. Based on results basis, Plackett–Burman screen significance p...

Drying is a common process step for agricultural grain products ease of handling and to achieve the desired quality levels. One commodities that have high economic value produced by farmers in Lampung Province cocoa beans. The drying may change physical properties beans affect processing at later stage. This study aims determine effect temperature on changes such as dimension, volume, weight, s...

In discrete element method (DEM) simulations, accurate simulation parameters are very important. For ellipsoidal soybean seed particles, the rolling friction coefficient between particles (RFCP-P) and coefficients particle boundary (RFCP-B) difficult to measure experimentally therefore need be calibrated. this paper, of three varieties with different sphericities were taken as research objects....

S U M M A R Y Volcanoes usually show signs of unrest before an eruption. Establishing physical controls on the duration of precursory activity, that is run-up time, could improve understanding of the dynamics of magma ascent from a shallowmagma reservoir to the surface. Another observable indicative of eruption dynamics is the interevent repose time, that is, the time betweenmagmatic eruptions....

Understanding the unusual radar scattering characteristics of sand dunes is necessary in the analysis of radar images of aeolian landscapes of the earth and of other planets. In this paper we report on airborne radar scatterometer data of sand dunes, acquired at multiple frequencies and polarizations. Radar backscatter from sand dunes is very sensitive to the imaging geometry. At small incidenc...

Uniformity in the deposition of granulated fertilizers seed furrow is essential for crop development and productivity. Quantitative (dose flow) qualitative factors (segregation formulation) influence fertilizer distribution throughout its application. This experiment aimed to compare two with different chemical formulations (04-14-08 04-30-10), using helical overflow metering mechanism at three...