Burton Optical Company (Cases A & B)

Thesis (M.B.A.)--Boston Universit

Examining Long-Term Global Climate Change on the Web

This article describes an activity in which students use web-based resources to investigate global climate change. The investigation takes the form of a computer activity in which they collect data from the internet on temperature, concentrations of various gases, oxygen isotopes, and others. The activity begins by posing the question: 'Should the U.S. and other countries limit emissions of greenhouse gases to reduce global warming?' The students then construct graphs, look for trends, and report their findings. Educational levels: Middle school, High school, Undergraduate lower division

Measuring the Effects of a Research-Based Field Experience on Undergraduates and K-12 Teachers

During the summer of 1999, a new type of field course was taught in five of eastern Utah's National Parks and Monuments. It targeted a combination of university undergraduates and K-12 teachers, emphasized development of participants' problem-solving skills, and assessed the effectiveness of several non-traditional teaching methods. The course's primary goal was to teach participants to develop and test their own ideas. The course was also designed to help participants learn to use tools and methods employed by research scientists. A mix of undergraduates and teachers was targeted so that the course could be used to introduce undergraduates to the concept of teaching as a career. Assessments of the course's effectiveness were made on the basis of the achievements of stated outcomes, and by pre-course and post-course testing. Educational levels: Graduate or professional

The High-Vacuum Tetrode as a Thyratron

A circuit is described wherein the ordinary tetrode or screen-grid vacuum tube, when operated as a Dynatron exhibits the characteristics of a Thyratron or gas-filler triode. The method of determining the circuit constants and details of operation are given. Several simple applications such as quiet automatic volume control for radio receivers, scale counters, and sweep circuits are outlined

Application of Metal Spraying to the Construction of a High Voltage Condenser

In the construction of a high voltage condenser of the glass plate type it is necessary to coat relatively large areas (60 square yards in this case) with a smooth conducting layer well bonded to the glass. Spraying molten aluminum directly onto the surface was tried and found to give a suitable coating. A description of the commercial Metal-Spray apparatus will be given and samples of the sprayed glass presented. Such factors as preparation of the surface, spraying technique, adhesion of the film, electrical resistance of the coating, and the effect of the heat on the glass will be discussed

Simple quantitative determination of the non-protein portion of milk, based on Greenwald\u27s modification of the determination of the non-protein nitrogen in blood.

As far as I have been able to determine from the scant literature at hand, no attempt has been made as yet to determine the percentage of non-protein nitrogen in milk by a procedure simple enough for use as a clinical method. This problem was suggested to me by Dr. Charles J. Robinson, with the request that I should base my method on some of the methods of determination of the non-protein nitrogen portion of other physiological fluids

Power required to run machine tools

Thesis (B.S.)--University of Illinois, 1905.Typescript

III-V optoelectronic devices in the BGaInAs material system

In this work, we investigate the potential of direct-bandgap, III-V materials for lattice-matched absorbers and emitters on silicon. Leveraging the small lattice constant of the boron pnictides, BGaInAs can be grown lattice-matched or nearly lattice-matched to Si; however, the difficult growth mechanics of elemental boron and the highly mismatched nature of BGaInAs have limited prior synthesis of this alloy to compositions outside those required for lattice-matched growth on Si and outside of technologically interesting wavelengths. Therefore, this work focuses on BGaInAs growth on GaAs. Focusing on GaAs reduces the simultaneous amount of boron and indium required to maintain lattice-matching or near lattice-matching as compared to Si. Here, we exploit the non-equilibrium growth properties of molecular beam epitaxy to simultaneously increase the incorporation of boron and indium - enabling the longest wavelength emission from BGaInAs, the first boron-containing active region electrically injected emitter, and all-BGaInAs photodetectors. Our approach is the optimization of BGaInAs on GaAs, focusing on further extending emission wavelengths and increasing B, In concentrations in lattice-matched detectors in order to develop understanding of how increasing B concentrations (and requisite In concentrations) affect BGaInAs-based devices, thus providing a path towards lattice-matched optoelectronic devices on Si.Electrical and Computer Engineerin