High-speed assembly language (80386/80387) programming for laser spectra scan control and data acquisition providing improved resolution water vapor spectroscopy

An assembly language program using the Intel 80386 CPU and 80387 math co-processor chips was written to increase the speed of data gathering and processing, and provide control of a scanning CW ring dye laser system. This laser system is used in high resolution (better than 0.001 cm-1) water vapor spectroscopy experiments. Laser beam power is sensed at the input and output of white cells and the output of a Fabry-Perot. The assembly language subroutine is called from Basic, acquires the data and performs various calculations at rates greater than 150 faster than could be performed by the higher level language. The width of output control pulses generated in assembly language are 3 to 4 microsecs as compared to 2 to 3.7 millisecs for those generated in Basic (about 500 to 1000 times faster). Included are a block diagram and brief description of the spectroscopy experiment, a flow diagram of the Basic and assembly language programs, listing of the programs, scope photographs of the computer generated 5-volt pulses used for control and timing analysis, and representative water spectrum curves obtained using these programs

Evidentiary Problems in—And Solutions For—the Uniform Commercial Code

The Uniform Commercial Code does not offer a systematic approach to the rules governing the evidentiary relationships of parties to commercial litigation. In this article, Professors Allen and Hillman present a general analytical approach to proof rules, highlight the shortcomings of the Code\u27s evidentiary provisions, and discuss the inevitable confusion in the case law construing the Code. They propose an amendment to the Code designed to clarify and improve the Code approach

Gain control of photomultiplier tubes used in detecting differential absorption lidar returns

A technique for controlling the gain of a photomultiplier tube (PMT) 20. A voltage divider (resistors 45-49 in FIG. 1 and zener diodes 60-65 in FIG. 3) is used to control the potentials on dynodes 5, 7, and 9 of PMT 20. Transistor switches 53 and 58 provide the control of the voltage divider in FIG. 1 and photodiodes 66, 67 and 70 provide the control in FIG. 3. The gain control of PMT 20 is in the range from 100% to less than 0.001% (100,000 to 1)

PARTICIPATION IN MULTIPLE-PERIL CROP INSURANCE: RISK ASSESSMENTS AND RISK PREFERENCES OF CRANBERRY GROWERS

To investigate the poor participation rate of cranberry growers in the multiple-peril crop insurance program, a sample of 15 Massachusetts growers was interviewed. According to their risk preferences, a much greater proportion of growers should have insured, than actually did. A possible solution is to match the distribution used by the insurer closer to that believed by the grower. Adjusting each grower's historical yield series for trend brought the historical and subjective mean yields much closer. However, an aggregate test found the effect of adjustment to be insignificant, implying that the avenue for increased participation lies elsewhere.Risk and Uncertainty,

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The Motivation And Identity Challenges For Phd Holders In The Transition To Science And Mathematics Teaching In Secondary Education: A Pilot Study

Australian secondary education has endured a chronic shortage of qualified mathematics and science teachers for a number of years, particularly in rural and remote areas. A longitudinal research project examining the capacity for the holders of PhD level qualifications in mathematics and science to be utilised as one means of addressing this shortage has been commenced at two regional Australian universities. This paper reports on the pilot study which utilised semi-structured interviews involving five participants at various stages of the transition into secondary school teaching. The interviews examined the motivations of the participants to enter secondary teaching and the challenges associated with the transition. The principle findings were that all but one of the participants had considered secondary teaching as a career option for an extended period that, for some, had predated their PhD study. Those participants who had engaged in postdoctoral study reported substantial professional identity challenges associated with the change in career. Financial security considerations figured strongly in the decisions to initiate the transition to secondary teaching. The opportunities for further research identified by the pilot study are discussed