Minimum tillage is a soil conservation practice involving a reduction in soil disturbance and topsoil compaction, which could minimize environmental impact of the tobacco cultivation system. The objectives of this study were to evaluate the development and growth responses of Nicotiana tabacum and the changes in the physical and hydrological soil properties after the application of two differen...

sunn pest (eurygaster integriceps put.) cause serious economic damage to wheat and barley in borujerd, north of lorestan province, iran. sweep net sampling, is the most convenient sampling procedure for many arthropods, but it is difficult to interpret in terms of accuracy and precision. much of the variation of sweep net catches, stems from human factors and its calibration. in this research, ...

In an open channel, a hydraulic jump is a sudden transition from a high-velocity to slower, fluvial flow motion. The impinging flow forms a turbulent roller with a highly fluctuating free-surface, while a large amount of air bubbles is entrapped at the jump toe. The present work presents some physical investigations of hydraulic jumps based upon a wide range of inflow Froude numbers (3.8 < Fr1 ...

The article considers the general shortcomings of packers designed for carrying out geological and technical measures in an open hole. These packer deficiencies can cause problems operation wells, which leads to increase non-productive time or even loss a well and, as result, high costs oil gas companies. design sliding support elements, centering structure hole, preventing leakage sealing rubb...

This paper studies the scheduling of servicing multiple satellites in a circular orbit. Specifically, one servicing spacecraft (SSc) is considered to be initially on the circular orbit of the satellites to be serviced. The SSc then rendezvous with each satellite of the constellation and services it until all satellites are visited. The total time is assumed to be given. A minimum-∆V two-impulse...