Ion engine thrust vector study Quarterly report

Thrust stand and thruster designs for ion engine

Software Implementation of Digital Filtering via Tustin's Bilinear Transform

The purpose of this work is to provide some notes on a software implementation for digital filtering via Tustins Bilinear Transform. The first section discusses how to solve for the input and output coefficients by hand using a generalized approach called Horners method. The second section presents some results of this generalized digital filtering approach using the IHMC Open Robotics Software stack and Simulation Construction Set 2. This generalized approach can solve for the digital coefficients for any causal transfer function.Comment: 16 page

Chemical Weed Control in Tobacco Fields

Enide 50W and Vernam 6E are the two herbicides recommended in 1968 for weed control in tobacco fields

Stamp Out Chickweed and Henbit from Alfalfa

What are chickweed and henbit? Chickweed and henbit are winter annual weeds that grow during cool weather. The seeds germinate primarily in the fall, and the plants continue to grow and live through the winter. They develop new seeds from April until early summer. Then they die

Tobacco Bed Treatment with Enide 50W

Enide 50W is recommended for trial use on tobacco beds for 1968. The results of treatments with Enide in Kentucky in 1967 have been somewhat variable; therefor e, until additional information is obtained and the tobacco grower becomes more experienced in applying the chemical, it should be used on a trial basis

Enide Recommended for Trial Use on Tobacco Beds

Enide 50W has now been cleared for use on tobacco beds. Treatments with Enide on tobacco beds in mid to late March. at time of seeding have given satisfactory weed control in experimental plots during the past 2 years. No injury or reduction in stand of tobacco plants was observed on plots treated at this time. Reduction in stand of plants did occur in plots treated in late fall. and there are some indications that there may be a reduction in stand from early treatments in February. To insure best results. the chemical should be applied evenly over the treated area. Until additional information is obtained and tobacco growers get more experience with its use, Enide 50W for 1967 is recommended for trial use on only a part of the plant bed

Engineering model 8-cm thruster subsystem

An Engineering Model (EM) 8 cm Ion Thruster Propulsion Subsystem was developed for operation at a thrust level 5 mN (1.1 mlb) at a specific impulse 1 sub sp = 2667 sec with a total system input power P sub in = 165 W. The system dry mass is 15 kg with a mercury-propellant-reservoir capacity of 8.75 kg permitting uninterrupted operation for about 12,500 hr. The subsystem can be started from a dormant condition in a time less than or equal to 15 min. The thruster has a design lifetime of 20,000 hr with 10,000 startup cycles. A gimbal unit is included to provide a thrust vector deflection capability of + or - 10 degrees in any direction from the zero position. The EM subsystem development program included thruster optimization, power-supply circuit optimization and flight packaging, subsystem integration, and subsystem acceptance testing including a cyclic test of the total propulsion package

A Consensus on Second Stage Analyses in Ecological Inference Models

Statistic