Aiming to solve the problems of easy generation clods, poor soil fluidity and soil-covering effect in no-tillage seeding operation mode, this study has designed a device with soil-closing function for chisel-type furrow opener corn planter. Theoretical analysis design dividing plate disc were carried out, key parameters determined. Then, movement model was constructed Altair EDEM, spatial parti...

Press-wheels are wheels designed to compact the soil above seeds in “seed cover” region. Soil compaction, produced by press-wheels of seeders, affects seedling emergence and early plant growth. The Discrete Element Method (DEM) was used model amount compaction from a press-wheel with varying down forces. predict sinkage rolling resistance press-wheel. results were validated data bin tests sandy...

The Cry48Aa/Cry49Aa mosquitocidal two-component toxin was recently characterized from Bacillus sphaericus strain IAB59 and is uniquely composed of a three-domain Cry protein toxin (Cry48Aa) and a binary (Bin) toxin-like protein (Cry49Aa). Its mode of action has not been elucidated, but a remarkable feature of this protein is the high toxicity against species from the Culex complex, besides its ...

Accurate sound localization is based on three acoustic cues (interaural time and intensity difference and spectral cues from directional filtering by the pinna). In natural listening conditions, every spatial position of a sound source provides a unique combination of these three cues in "natural alignment." Although neurons in the central nucleus (ICC) of the inferior colliculus (IC) are sensi...

Consider a balls-in-bins process in which each new ball goes into a given bin with probability proportional to f(n), where n is the number of balls currently in the bin and f is a fixed positive function. It is known that these so-called balls-in-bins processes with feedback have a monopolistic regime: if f(x) = x for p > 1, then there is a finite time after which one of the bins will receive a...

The bin packing problem is a well-studied combinatorial NP-hard problem. In the bin packing problem, a sequence of items are packed into bins, the packed items in a bin do not overlap. The objective is to minimize the number of used bins. The size of each item should be no more than the size of a bin. (Zhang, 2011) The algorithms can be divided into two categories: offline algorithm, requiring ...