Anode power deposition in applied-field MPD thrusters

Anode power deposition is the principal performance limiter of magnetoplasmadynamic (MPD) thrusters. Current thrusters lose between 50 and 70 percent of the input power to the anode. In this work, anode power deposition was studied for three cylindrical applied magnetic field thrusters for a range of argon propellant flow rates, discharge currents, and applied-field strengths. Between 60 and 95 percent of the anode power depositions resulted from electron current conduction into the anode, with cathode radiation depositing between 5 and 35 percent of the anode power, and convective heat transfer from the hot plasma accounting for less than 5 percent. While the fractional anode power loss decreased with increasing applied-field strength and anode size, the magnitude of the anode power increased. The rise in anode power resulted from a linear rise in the anode fall voltage with applied-field strength and anode radius. The anode fall voltage also rose with decreasing propellant flow rate. The trends indicate that the anode fall region is magnetized, and suggest techniques for reducing the anode power loss in MPD thrusters

Benchmarking and performance analysis of the CM-2

A suite of benchmarking routines testing communication, basic arithmetic operations, and selected kernel algorithms written in LISP and PARIS was developed for the CM-2. Experiment runs are automated via a software framework that sequences individual tests, allowing for unattended overnight operation. Multiple measurements are made and treated statistically to generate well-characterized results from the noisy values given by cm:time. The results obtained provide a comparison with similar, but less extensive, testing done on a CM-1. Tests were chosen to aid the algorithmist in constructing fast, efficient, and correct code on the CM-2, as well as gain insight into what performance criteria are needed when evaluating parallel processing machines

What Isn't Guidance?

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/89514/1/j.2164-5892.1949.tb01580.x.pd

What Should be the Duties of the Counselor? 1

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90294/1/j.2164-5884.1931.tb00956.x.pd

Follow‐Up: The Stepchild of the Guidance Family

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/89480/1/j.2164-5892.1948.tb01467.x.pd

A Critical Review Of Present Developments In Vocational Guidance With Special Reference To Future Prospects

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/89532/1/j.2164-5884.1924.tb00721.x.pd

A Training Program For Vocational Counselors

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90600/1/j.2164-5884.1927.tb01089.x.pd

The economic value of viewing migratory shorebirds on the Delaware Bay: An application of the single site travel cost model using on-site data

We estimated a count data model of recreation demand using data from an on-site survey of recreational birders who had visited southern Delaware during the month–long annual horseshoe crab/shorebird spring migration in 2008. We analyzed daytrips only. Our estimates from the models ranged from $32 to$142/trip/household or about $131 to$582/season/household (2008$). The variation was due to differences in the value of time. The average household size was 1.66. We found that the valuation results were sensitive to the inclusion of covariates in the model. Our results are useful for damage assessments and benefit–cost analyses where birdwatching is affected.recreational birding, economic value, shorebird migration, onsite sampling, endogenous stratification

Measuring the Recreational Use Value of Migratory Shorebirds on the Delaware Bay

In this article we estimate the recreational use value of household trips to view shorebirds during the annual horseshoe crab/shorebird migration on the Delaware Bay. We use contingent valuation to estimate the value of day and overnight trips separately and use a discrete choice question followed by a payment-card question to generate our valuation data. Our best estimates for the value of a day trip are about $66–$90/household and for an overnight trip about $200–$425/household (2008$). Our data are from the 2008 season, and our average household size is 1.66. For some context, estimates from four other studies report values that vary from$63/trip/person to $442/trip/person. These studies vary in method and specific birding populations studied and mix day and overnight trips.Contingent valuation, discrete choice, bird watching, use value, Environmental Economics and Policy, Public Economics, Research Methods/ Statistical Methods, Q5,