Efficient algorithm and architecture for implementation of multiplier circuits in modern EPGAs

High speed multiplication in Field Programmable Gate Arrays is often performed either using logic cells or with built-in DSP blocks. The latter provides the highest performance for arithmetic operations while being also optimized in terms of power and area utilization. Scalability of input operands is limited to that of a single DSP block and the current CAD tools provide little help when the designer needs to build larger arithmetic blocks. The present thesis proposes an effective approach to the problem of building large integer multipliers out of smaller ones by giving two algorithms to the system designer, for a given FPGA technology. Large word length is required in applications such as cryptography and video processing. The first proposed algorithm partitions large input multipliers into an architecture-aware design. The second algorithm then places the generated design in an optimal layout minimizing interconnect delay. The thesis concludes with simulation and hardware generated data to support the proposed algorithms

Research Notes : United States : Genes for resistance to Phytophthora megasperma f. sp. glycinea in PI 273483D, PI 64747, PI 274212, PI 82312N, and PI 340046

Several years ago, we identified seven plant introductions resistant to the 16 races of Phytophthora megasperma f. sp. glycinea Kuan and Erwin (Pmg) known at that time. Each of these was crossed to the eight cultivars in Table 1 to determine how resistance was controlled. They were not crossed to cultivars that contained Rps2 or Rps5 because Rps2 was found using root inoculation in a liquid culture solution, and Rps5 was described after this study was started

A Comparative Study of Diaporthe Stem Canker and Pod and Stem Blight of the Soybean

Abstract not availabl

Real gas considerations for determining physical and thermodynamic properties of gasses involved in the prediction of the effects of internal explosions.

An investigation into the thermodynamic properties of gaseous magnesium, aluminum and their oxides has been conducted to determine the validity of assuming ideal-gas-law behavior in confined explosions when these metals are present. A number of vapor phase equations of state were tested and compared. The paucity of experimental and rigorous theoretical data mandated the use of an equation of state that would provide realistic results and yet be tolerant of reasonable variations in the estimation of necessary parameters. The parameters selected are the vapor phase critical constants, which have been estimated from the theory of corresponding states or from partition function calculations. Using the Dieterici equation, which proved satisfactory in terms of the two criteria given above, it was determined that deviation from ideal gas behavior was insignificant except in the case of metal oxides, which may have a determinable effect on the equilibrium conditions of the explosion products.http://archive.org/details/realgasconsidera00athoLieutenant Commander, United States NavyApproved for public release; distribution is unlimited

Enlargement of Marcus Hook Anchorage, Delaware River: Hydraulic Model Investigation

Source: https://erdc-library.erdc.dren.mil/jspui/An existing comprehensive physical model that correctly reproduced tides, tidal currents, and density currents throughout the entire Delaware Bay and River was used to determine the effects of enlargement of the Marcus Hook Anchorage. The study included tests in the model of the plan configuration to define its effects on tidal heights, current velocities, salinities, surface current patterns, dye dispersion, and post-dredging shoal developments. Based on the results of the model tests, the following conclusions were reached : (A.) the plan would have no effect on tidal heights or tidal phasing; (B.) the effects of the plan on current velocities and patterns would be minimal; (C.) the plan would not significantly change the salinity regime when low-flow conditions allow salinity to intrude into the study area; (D.) the plan caused a trend for dye concentrations to increase within and in the immediate vicinity of the Marcus Hook Anchorage for dye released between the main navigation channel and the proposed enlargement (sta E2 release) (a trend also existed for the plan to cause a slight increase in dye concentrations within the Marcus Hook Anchorage and a decrease downstream for dye released at the mouth of Raccoon Creek) ; and (E.) the effects of the plan on shoaling rates would be to increase the efficiency of the Marcus Hook Anchorage as a sediment trap, due to the enlarged cross-sectional area. Although there would not be a significant change in the shoaling rate in the Federal navigation channel, there would be a redistribution of shoaling in the study reach

Effects of Hurricane Surge Barrier on Hydraulic Environment, Jamaica Bay New York: Hydraulic Model Investigation

Source: https://erdc-library.erdc.dren.mil/jspui/An existing comprehensive physical model that correctly reproduced tides, tidal currents, hurricane surges, and salinity distribution throughout the New York Harbor area and especially the Jamaica Bay complex was used to determine the effects of 13 different hurricane surge barrier plans on the hydraulic environment of Jamaica Bay. The study included tests in the model to determine : (a.) the size of the ungated navigation opening that will provide the suppression required inside Jamaica Bay during periods of hurricanes and northeasterly storms; (b.) the maximum current velocities in and near the navigation opening that will be experienced by navigation during normal tidal conditions; (c.) the effects of the hurricane surge protection structure on tides, tidal currents, salinities, and pollution dispersion patterns within the bay for normal tide conditions; and (d.) the minimum area of gated tidal passages required to maintain existing conditions in the bay with respect to salinities and pollution dispersion. During the course of the study, additional tests were conducted to investigate schemes to enhance circulation within the bay. Based on the results of the model testing program, the following conclusions were reached : (1.) For the sizes of ungated navigation openings considered in this study, a slow rising hurricane surge with a moderate peak water level (similar to the November 1950 surge) produces higher water levels behind the surge barrier in Jamaica Bay than does the Standard Project Design surge, which has a considerably higher peak water level but a much faster period of rise. (2.) A relationship was developed for the cross-sectional area of navigation opening required to achieve various degrees of suppression of the maximum water-surface level (to heights from 5.0 to 6.6 ft) in Jamaica Bay for the November 1950 hurricane surge without astronomical tides. (3.) The maximum velocities for mean tide condition near the navigation opening that can be expected to be experienced by boat traffic vary directly with the total cross-sectional area of the navigation opening and tidal openings. (4.) Barrier plans B, C-1, C-2, and C-3 would have the least effect on the hydraulics of the Jamaica Bay area. Tide phases would be shifted slightly. The magnitudes and locations where current velocities are the greatest in the throat of Rockaway Inlet are increased and shifted, respectively. (5.) Dye dispersion (simulating pollution dispersion) with plan C-1 with a conservative dye source seaward of the barrier indicated that average dye concentrations will be increased slightly in most areas in Jamaica Bay. For the conservative dye source within Jamaica Bay, average dye concentrations will be increased within the bay but will be reduced in areas outside of the bay. (6.) Barrier plan 3 would require the smallest area of gated tidal passages to maintain existing conditions with respect to salinities and pollution dispersion. During the testing program, however, it became evident that velocities in Rockaway Inlet with respect to safe navigation were a more stringent criterion and that barrier plan C-1 would satisfy both the pollution dispersion and safe navigation criteria. (7.) Tests conducted to develop an operative scheme of gate operation to improve circulation in Jamaica Bay indicated that improved conditions could be obtained; however, very adverse navigation conditions also occurred consisting of definite crosscurrents and areas of relatively high velocities. (8.) Tests conducted with various levees, submerged sills, and/or dredging within Jamaica Bay did not result in significant inprovements in the flushing of Jamaica Bay._x000D_ _x000D_ NOTE: This file is large. Allow your browser several minutes to download the file