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Articles 1 - 8 of 8
Full-Text Articles in Engineering
Beam Propagation In Periodic Quadratic-Index Waveguides, Lee W. Casperson
Beam Propagation In Periodic Quadratic-Index Waveguides, Lee W. Casperson
Electrical and Computer Engineering Faculty Publications and Presentations
Several techniques are described for studying the propagation of off-axis polynomial Gaussian beams in media having straight axes and periodic z variations of the quadratic refraction and loss coefficients. For some periodic variations, exact analytical solutions of the paraxial equations are possible, and for sufficiently slow variations, WKB solutions can always be obtained. All results are expressed in conventional beam matrix form.
Spontaneous Coherent Pulsations In Ring-Laser Oscillators: Stability Criteria, Lee W. Casperson
Spontaneous Coherent Pulsations In Ring-Laser Oscillators: Stability Criteria, Lee W. Casperson
Electrical and Computer Engineering Faculty Publications and Presentations
The stability criteria implied by a simplified semiclassical laser model are considered in detail. It is found that two types of criteria must be distinguished. The first concerns the smallest pump rate for which infinitesimal perturbations of the steady-state solution will increase with time, and the second concerns the smallest pump rate for which large amplitude modulations will not damp away.
The Applicability Of Microcomputers To Local Water Management, Roderick Lee Allen
The Applicability Of Microcomputers To Local Water Management, Roderick Lee Allen
Dissertations and Theses
Historically, hydrologic models have been available only on mainframe computers and have therefore not been used by local water managers to support daily decisions. The development of the microcomputer presents an opportunity for that to change.
Mathematical models of soil moisture and river routing are selected, developed and tested for use on a microcomputer as an aid to local water management. The models are then integrated with an appropriate data base in a computer program written for a microcomputer. The result is a Decision Support System for local water managers.
In order to evaluate the feasibility of using the Decision …
Microcomputer Mrp In Three Months: Photon Kinetics, Wayne W. Wakeland
Microcomputer Mrp In Three Months: Photon Kinetics, Wayne W. Wakeland
Systems Science Faculty Publications and Presentations
Information about the company Photon Kinetics, a small, privately-held manufacturer of fiber optics test equipment, located in Beaverton, Oregon.
Two New Parallel Processors For Real Time Classification Of 3-D Moving Objects And Quad Tree Generation, Farjam Majd
Two New Parallel Processors For Real Time Classification Of 3-D Moving Objects And Quad Tree Generation, Farjam Majd
Dissertations and Theses
Two related image processing problems are addressed in this thesis. First, the problem of identification of 3-D objects in real time is explored. An algorithm to solve this problem and a hardware system for parallel implementation of this algorithm are proposed. The classification scheme is based on the "Invariant Numerical Shape Modeling" (INSM) algorithm originally developed for 2-D pattern recognition such as alphanumeric characters. This algorithm is then extended to 3-D and is used for general 3-D object identification. The hardware system is an SIMD parallel processor, designed in bit slice fashion for expandability. It consists of a library of …
Forecasting For Local Water Management, Douglas Alan Putnam
Forecasting For Local Water Management, Douglas Alan Putnam
Dissertations and Theses
Forecast models are investigated and developed for use in local water management to aid in determining short term water requirements and availability. The forecast models include precipitation occurrence and depth using a Markov chain model, temperature and solar radiation with a multivariate autoregressive model, and streamflow with autoregressive-moving average models. The precipitation, temperature, and solar radiation forecasts are used with a soil moisture model to determine water demands. A state space approach to the Muskingum-Cunge streamflow routing technique is developed. The forecast water demands and streamflow forecasts are used as inputs to this routing model. Forecast model errors and propagation …
Transient Flow Inverse Study Calculation Of Unsaturated Permeability Of Wood, Farid Piroozmandi
Transient Flow Inverse Study Calculation Of Unsaturated Permeability Of Wood, Farid Piroozmandi
Dissertations and Theses
One of the major processes in lumber industry is wood drying. This process consumes large amounts of energy and capital, and due to the length of time it takes, it acts as a governing factor in lumber production levels. Development of improvements in processes and equipment used in wood drying can be expedited through computer simulation of various drying procedures. These numerical simulations depend on the accuracy of numerical models representing wood transport properties, including functional dependency of liquid permeability through wood with respect to local saturation level. Data available in the literature mainly represent wood permeability properties at fully …
Spontaneous Coherent Pulsations In Ring-Laser Oscillators, Lee W. Casperson
Spontaneous Coherent Pulsations In Ring-Laser Oscillators, Lee W. Casperson
Electrical and Computer Engineering Faculty Publications and Presentations
Complex spontaneous-pulsation phenomena have been reported in xenon lasers operating at 3.51-μm wavelength, and a theoretical explanation for these effects has been given. However, the published models contain various simplifications and have so far yielded only qualitative agreement with xenon-laser experiments. Reported here is a more rigorous analytical model, which for the first time provides quantitative agreement with experimental observations. This model should also find direct application in interpreting or predicting the behavior of other spontaneously pulsing laser systems.