We present “contact levels of detail” (CLOD), a novel concept for multiresolution collision detection. Given a polyhedral model, our algorithm automatically builds a “dual hierarchy”, both a multiresolution representation of the original model and its bounding volume hierarchy for accelerating collision queries. We have proposed various error metrics, including object-space errors, velocity dep...

To solve the problems of a large number clods remaining in potatoes after mechanized harvesting northern heavy clay soil planting areas China and requiring much labor to separate from potatoes, which leads workload, inefficiency low cleaning rate, an RGB-D-based Mask R-CNN dynamic potato identification model is established by using acquired RBG-D image data untreated harvesting, method presente...

Factorial experiment under randomized complete block design with three replication was conducted in field collage of Agricultural Engineering Science – University Baghdad 2022, for study effect two types moldboard slatted and general purpose some physical properties depths tillage 15 25 cm speeds tractor 4.146 7.224 km/hr. Slatted recorded least (best) number clods > 10 4.58 clod/m2, soil bu...

OBJECTIVES The aim of this study was to calculate the horizontal growth rate of melanoma in vivo and to correlate it with morphologic findings. PATIENTS AND METHODS We searched our database for melanomas for which sequential dermatoscopic images and histopathologic slides were available. The final sample consisted of 50 melanomas of 48 patients (mean age: 50 ± 15 years, 62% females). We calcu...

Abstract. The ploughing of soils in autumn drastically loosens the soil structure and, at same time, reduces its stability against external stresses. A fragmentation these artificially produced clods during wintertime is often observed areas with air temperatures fluctuating around freezing point. From pore perspective, it still unclear (i) under which conditions frost action has a measurable e...

To supply water to the fields, an irrigation system is built, which includes a source of supply, intake structure with pumping unit, transport, distribution and working channels or pipes. Closed open networks are built on fields. In closed network, under pressure supplied through pipes hydrants machines installations. The network laid in form temporary pipelines, trays, from by pumps sprinklers...

Classical concepts of mechanics applied to continuous materials cannot be used directly for associations of soil clods occurring in ploughed and harrowed topsoils. Therefore, we are proposing a new simpli®ed method for analysing the clod : clod mechanics, for a wide range of clay content. We pressed together axially two adherent remoulded soil balls and recorded a dimensionless strain ̄attening...

soil. Planting of the crop over this low density slot is critical. These soils occur in the USA, primarily in the Using deep tillage to alleviate the adverse effects of deleterious soil Coastal Plains, and in other regions to a minor extent physical properties has been tried many times. Consistent economic returns have been reported for in-the-row subsoiling of loamy sand (Buol, 1973). and coar...

ABSTRACT The soils of the Amazon region, despite being under one densest forests in world, are mostly characterized by low availability nutrients, with litter main route nutrient entry. objective this study was to quantify biomass fine roots dry and rainy seasons year, including organic carbon soil, compare results different environments. carried out environments native forest reforestation age...

Soil tillage is a critical process in agricultural production. Furthermore, the consumes lot of energy and time to complete soil practices. A disk plow with triple disks was tested one Agriculture Forestry college plantations at University Mosul during season 2013. The research included two moisture contents (10.7 16.2%), three distances between inner face scraper (2, 4, 6 cm). Besides, forward...