A valuable new resource being developed for today’s soldier are small ducted fan VTOL UAVs. Although beneficial in many ways, a major operational problem of ducted fan vehicles is precise control when flying in crosswinds and turbulent conditions in general. There are two significant, inherent issues associated with ducted fan control in crosswinds; 1) lateral momentum drag and 2) a duct stabil...

The Gröbner fan of an ideal I ⊂ k[x1, . . . , xn], defined by Mora and Robbiano, is a complex of polyhedral cones in Rn. The maximal cones of the fan are in bijection with the distinct monomial initial ideals of I as the term order varies. If I is homogeneous the Gröbner fan is complete and is the normal fan of the state polytope of I. In general the Gröbner fan is not complete and therefore no...

peanuts, an oilseed crop, contain about 46% oil. the peanut shell can be used as fuel or pallets and its dry matter as feedstuff. the whole pods consist of 1-6 kernels. shelling is done at harvest time when the pod moisture content is 5-10%. in this research, a peanut sheller was designed and developed to separate the shell from the pod. the sheller included a hopper, sheller cylinder, concave,...

The usage of the air-conditioning system to provide comfortable indoor conditions is found necessary especially for hot-and warm countries. However, excessive use or without properly controlled will significantly affect energy consumption building and also environment badly. This study investigates strategy reduce cooling in an office room by utilizing high setting temperature air conditioning ...

A binary comparator architecture is proposed in this work for static logic to achieve both low-power and high-performance operations. It also presents a detailed timing performance power analysis of various state-of-the-art designs. The main advantages design are its high speed efficiency maintained over wide range operands size, which useful at low-input data activity environments. circuit use...

The flow of air generated by a new design of air assisted sprayer equipped with two axial fans of reversed rotation was analyzed. For this goal, a 3D sonic anemometer has been used (accuracy: 1.5%; measurement range: 0 to 45 m/s). The study was divided into a static test and a dynamic test. During the static test, the air velocity in the working vicinity of the sprayer was measured considering ...

This paper presents a generalized control heuristic to reset supply air temperature setpoints for DX units with capacity modulation and variable air flow. The heuristic is shown to work well for different DX systems with different compressor types and fan-duct combinations. Digital scroll and variable-speed compressors were considered and modeled using curve fits to manufacturer’s data. Evapora...