Synthesis of electro-optic modulators for amplitude modulation of light

Electro-optical modulator realizes voltage transfer function in synthesizing birefringent networks. Choice of the voltage transfer function is important, the most satisfactory optimizes the modulator property

Technique developed for measuring transmittance of optical birefringent networks

The transmission characteristics of synthesized optical single-pass and double-pass birefringent networks is obtained by measuring network transmission as a function of network temperature. This technique is most useful for testing those birefringent networks whose bandwidths and periods are very small

Birefringent devices Final report, 8 Mar. 1966 - 8 Mar. 1967

Birefringent devices, lossless double-pass network synthesis, and electro-optical amplitude modulator

Feasibility study for reliable magnetic connection switch, phase I Final report

Feasibility of magnetic circuits for high reliability computer switche

TB183: Investment, Ownership and Operating Costs of Supplemental Irrigation Systems for Maine Wild Blueberries

This study investigates the investment and annual cost of supplemental irrigation equipment used on lowbush blueberries and calculates breakeven yields required to pay for annual costs and the earliest possible payoff period to recover investment costs. Using an economic-engineering approach to simulating investment and operating costs, this project assesses breakeven requirements on irrigation investment. The report reviews several of the technical factors contributing to the irrigation decision, calculate economic costs and are breakeven measures, but only introduce some of the financial factors for a grower to consider.https://digitalcommons.library.umaine.edu/aes_techbulletin/1025/thumbnail.jp

Empirical indicated loss analysis of a semi-hermetic light-commercial spool compressor

An analysis of the indicated losses is presented for a semi-hermetic, light-commercial, prototype, spool compressor. The spool compressor prototype was instrumented with five high-speed pressure sensors, three in the compression process, one in the discharge valve plenum, and one in the motor cavity. These sensors were triggered with a proximity sensor actuated by means of a custom rotary fixture attached to the compressor motor shaft. This coupling of rotational position and pressure measurements allowed the development of an indicator (pressure v. volume) diagram for the compression process. Additionally, the added sensor in the discharge valve plenum allowed for a de-coupling of discharge valve losses and flow losses within the discharge plenum itself. The sensor in the motor cavity allowed for an analysis of the flow losses leaving the compressor shell. The compressor was tested at five motor speeds (1100, 1300, 1500, 1700 rpm and line voltage) at condensing and evaporating temperatures ranging from 37.8-48.9 degrees C (90 - 130 degrees F) and -3.8 - 15.6 degrees C (30 -60 degrees F), respectively at a fixed suction superheat of 20 degrees R (11.1 K). Quantitative analysis shows that the suction and compression losses for this prototype compressor are relatively small compared with the discharge/valve losses. The total losses during the discharge process are generated by pressure drop and back flow through the discharge valve ports as well as when gas flows from the discharge plenum to out of the compressor body. It was found that a 5-6% compressor efficiency can be accomplished by redesigning the discharge plenum and motor cavity to reduce over pressurization. Further investigation into the valve dynamics need to be performed to improve the 11-12% loss in the valves. There is little dependence on operating condition for losses presented while the discharge losses tend to increase with and increasing speed and decreasing SDT. The work presented in this thesis is part of a broader initiative to improve the performance and functionality of the spool compressor specifically for low-GWP refrigerants

Fiber-Matrix Interface Studies on Electron Beam Cured Composites

The recently completed Department of Energy (DOE) and industry sponsored Cooperative Research and Development Agreement (CRADA) entitled, ''Electron Beam Curing of Polymer Matrix Composites,'' determined that the interlaminar shear strength properties of the best electron beam cured IM7/epoxy composites were 19-28% lower than autoclave cured IM7/epoxy composites (i.e. IM7/977-2 and IM7/977-3). Low interlaminar shear strength is widely acknowledged as the key barrier to the successful acceptance and implementation of electron beam cured composites in the aircraft/aerospace industry. The objective of this work was to improve the interlaminar shear strength properties of electron beam cured composites by formulating and evaluating several different fiber sizings or coating materials. The researchers have recently achieved some promising results by having discovered that the application of epoxy-based, electron beam compatible sizings or coatings onto surface-treated, unsized IM7 carbon fibers improved the composite interlaminar shear strength properties by as much as 55% versus composites fabricated from surface-treated, unsized IM7 fibers. In addition, by applying these same epoxy-based sizings or coatings onto surface-treated, unsized IM7 fibers it was possible to achieve an 11% increase in the composite interlaminar shear strength compared to composites made from surface-treated, GP-sized IM7 fibers. Work is continuing in this area of research to further improve these properties