This article presents a control approach that enables an autonomous operation of fleets of unmanned snow ploughs at large airports. The proposed method is suited for the special demands of tasks of the airport snow shovelling. The robots have to keep a compact formation of variable shapes during moving into the locations of their deployment and for the autonomous sweeping of runways surfaces. T...

In almost any scenario for ’cosmological’ gamma-ray bursts (and in many models where they originate in our own Galaxy), the initial energy density is so large that the resulting relativistic plasma expands with v ∼ c producing a blast wave ahead of it and a reverse shock moving into the ejecta, as it ploughs into the external medium. We evaluate the radiation expected from these shocks, for bot...

Farm machinery selection, operation and management directly impact crop cultivation processes outputs. A priori quantification of technical financial needs allows definition proportionate distribution available resources simplification selection process. Appropriate planning, association adjustment the power unit implement are required for soil cultivation. Consideration functional parameters i...

Tillage erosion is a potential contributor to the total soil erosion occurring within cultivated fields. No study has been carried out on tillage erosion associated with cereal-based production systems, which are the predominant form of crop production in the Canadian Prairies. Previous tillage translocation studies have focused on primary tillage implements (i.e. mouldboard and chisel ploughs)...

Two jets from the Orion (M42) 'proplyds' – kinematics, morphologies and origins. ABSTRACT A spatially unresolved velocity feature, with an approaching radial velocity of ≈ 100 km s −1 with respect to the systemic radial velocity, in a position–velocity array of [O iii] 5007Å line profiles is identified as the kinematical counterpart of a jet from the proplyd LV 5 (158–323) in the core of the Or...

Plough-breast is the crucial soil-engaging component of horizontally reversible plough (HRP). The unique merit HRP, in comparison to regular mouldboard ploughs, use remote cylinder (RC) drive its plough-body implement alternative shifting tillage operations. A major technical challenge operation violent soil-tool interaction, caused by varying RC speeds, appearing on plough-breast, particularly...

The non-turning or only superficial turning of soil is considered to be a gentle tillage method. Nevertheless, conventional ploughs are widely used in organic farming for crop production reasons. For the further development reduced tillage, and up no effects three cover species their incorporation with different intensities on nitrogen (N) dynamics, weed emergence yield subsequent main crop, oa...

Due to their (a) lower draught force requirements and (b) ability work at deeper operation depths faster speeds, disc ploughs have gained interest in Australia. A modified version of the plough that involves removing every second fitting larger often more concave discs has become popular. However, development one-way is its infancy, a detailed analysis required, particularly on soil movement. H...