The aim of this three-year field experiment was to determine how simplified (reduced) pre-planting tillage and different weed control methods impact the yield selected quality parameters spelt grain (Triticum aestivum ssp. spelta L.). Conventional three variants reduced (RT) were tested. second experimental variable (weed control) had variants: mechanical (M), combined + chemical treatment at f...

in the present study, the effect of various weight fractions of graphene nanoplatelet (gpl) on flexural fatigue behavior of epoxy polymer has been investigated at room temperature and generally the temperature was monitored on the surface of specimen during each test. the flexural stiffness of grapheme nano-platelet/epoxy nanocomposites at 0.1, 0.25 and 0.5 wt. % as a main effective parameter o...

The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. This paper presents the design, analysis and experimental testing of a variable-pitch quadrotor. A custom in-lab built quadrotor with on-board attitude stabilization is developed and tested. An analysis of the dynamic differences in thrust output between a fixed-pitch and varia...

in order to reduce herbicide utilization, a 3-year field experiment was carried out with integration of mechanical and chemical weed control methods; in mechanical method, three types of blades (curred- bed knife, square- turn knife and sweep) were used. chemical control was done with chloridazon (wp 80%) and desmedipham (ec 15.7%) in two spraying sheme: once band sparying with 2 l h-1 & twice ...

In this paper, we present a new robot ROMAIN. We describe the used mechanical, hardware and software architecture. This open structure is realized with a serial high speed bus : CAN. We develop the contraint and dynamic equations and we explain the state system. To control this robot, we use a variable structure control to track desired trajectories. However, this control method is too constrai...

The performance limitations of manipulators under joint wriable feedback contrQI are studied as a function of the mechanical flexibility inherent in the manipulator structure. A finite dimensional time domain dynamic model of a two-link, two-joint planar manipulator is used in the study. Emphasis is placed on determining the limitations of control algorithms that use only joint variable feedbac...

performances of electronic and mechanical draft control systems on a mf399 tractor were the objectives of the study to be evaluated and compared under field conditions. hence, the effects of two draft control systems (mechanical and electronic) under four ground speed levels and three set values of draft levels on rear wheel slippage, fuel consumption, compressive force within the top link and ...