Five-parameter potential box with inverse square singular boundaries

Using the Tridiagonal Representation Approach, we obtain solutions (energy spectrum and corresponding wavefunctions) for a new five-parameter potential box with inverse square singularity at the boundaries.Comment: 7 pages, 2 figures, 1 tabl

Evaluation of a Twin-Fluid Nozzle for Precision Air-Assisted Agro-Chemical Application

The purpose of agrochemical application is to provide nutrients for plant growth and to control weeds, insects and other crop pests as well as plant and animal disease pathogens. The objective of this study was to fabricate a twin fluid nozzle (TFN) and evaluate its distribution pattern for on-the-go precision air-assisted agricultural chemical application. The fabricated nozzle prototype was mounted on a test rig in the laboratory with a view to determine its distribution pattern at various liquid pressures and flow rates while the air pressure was kept constant in the first instance.Thereafter, the distribution pattern was also determined for varying air pressure while keeping the liquid flow rate and pressure constant.It was concluded that independent control of liquid flow rates and spray distribution pattern was achieved by a combination of controlling liquid and air pressure. In addition, a flow turndown ratio of 1.414:1 corresponding to 35.34 to 49.98 L/min, at a fixed air pressure was achieved by the TFN and that even spray distribution pattern were observed for 35.34 L/min liquid flow rate and 200 kPa liquid pressure for air pressures below 500 kPa. Although the pattern width was independent of variation in air pressure it decreased by 40 percent as the flow rate decreased from 49.98 to 35.34 L/min

Functional and pasting properties of a tropical breadfruit (Artocarpus altilis) starch from Ile-Ife, Osun State, Nigeria

This study was carried out to determine the proximate, functional and pasting properties of breadfruit starch. Breadfruit starch was isolated from matured breadfruit (Artocarpus altilis) and was analyzed for its functional, proximate and pasting properties. The starch contains 10.83%, 0.53%, 0.39%, 22.52%, 77.48% and 1.77% moisture, crude protein, fat, amylose, amylopectin and ash contents respectively. The average particle size, pH, bulk density and dispersibility of the breadfruit starch were 18 μm, 6.5, 0.673 g/mls, and 40.67% respectively. The swelling power of the breadfruit starch increases with increase in temperature, but there was a rapid increase in the swelling power from 70 to 80°C. The pasting temperature of the starch paste was 84.05°C, setback and breakdown values were 40.08 and 7.92 RVU respectively. The peak viscosity value was 121.25 RVU while final viscosity value was 153.42 RVU. This study concluded that breadfruit starch has an array of functional, pasting and proximate properties that can facilitate its use in so many areas where the properties of other starches are acceptable

Inheritance of resistance to blackeye cowpea mosaic and cowpea aphid-borne mosaic viruses in Phaseolus vulgaris

In populations from crosses of resistant and susceptible plants of the bean (Phaseolus vulgaris) cultivar Black Turtle Soup, resistance to blackeye cowpea mosaic virus (BICMV) and to cowpea aphidborne mosaic virus (CAbMV) was conferred independently by single dominant factors that appear to be closely linked. The symbol Bcm was assigned to the gene for BICMV resistance and Cam to that for CAbMV. Linkage was determined by separately inoculating plants of the testeross with both viruses on different leaves. Since BICMV and CAbMV Incite identical symptoms, but do not cross protect against each other, their presence in each susceptible plant was determined by enzyme-linked immunosorbent assay (ELISA). This detection method was highly specific because the two viruses are distantly related serologically. The normally resistant plants responded with a lethal systemic hypersensitive reaction when approach-grafted to BICMV or CAbMV-infected plants, or when mechanically in oculated and held constantiy at 35°