Browsing College of Engineering (COE) by Issue Date
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X‐ray diffraction approach to grain boundary and volume diffusion
(American Institute of Physics, 1973)A generalized two‐dimensional diffusionmodel has been developed which consists of an array of boundaries coupled to the free surface and to the substrate lattice. The model makes use of three nonlinear partial differential ... 
Fol: A Language for Implementing File Organizations for Information Storage And Retrieval Systems
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73008RThe language FOL is described. FOL facilitates the implementation of file organizations for IS & R systems. FOL is implemented in a list processing language LPL. Files in FOL are interepreted as a list of records, where ... 
Dynamic Quantum Allocation and SwapTime Variability in TimeSharing Operating Systems
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73001RNo abstract available. 
Generalized Structured Programming
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73003RIn an effort to eliminate some inconveniences connected with Dijkstra's method of Structured Programming, a generalized set of basic flow graphs for structuring programs is suggested. These structures generate the set of ... 
Microprogrammable Cellular Automata
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73006RThis paper reports research into cellular automata with two binary inputs, two binary outputs, and an octal control variable. A set of control variables is chosen and it is shown that any function of three variables can ... 
The Dynamic Creation And Modification of Heuristics in a Learning Program
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73007RPOLY FACT is a learning program that attempts to factor multivariable polynomials. The program has been successful in factoring polynomials (in simplified form) with a maximum of 84 terms, each term consisting of as many ... 
Lpl: A Generalized List Processing Language
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73009RThe paper describes LFL, a generalized list processing language. LFL allows the user to define multiple cell structures and cell sizes at runtime, thereby allowing nonhomogeneous list structures. The paper examines the ... 
A Topological Model of the Data Space for a Block Structured Language
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73004RA space X is defined, the points of which are trees which possess a unique name property. A topology is defined for X based upon partial order. The topology is shown to be reasonably natural relative to the rationals. The ... 
Functionally Complete Machines
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73005RThis paper defines a functionally complete machine as a machine which is capable of evaluating every two place function over its data space. Necessary conditions on memory size for completeness are developed. These conditions ... 
A Complete Horizontal Microlanguage
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73002RThis paper defines a data space whose points are trees with leaves which are [name,value] pairs. Over this space a substitution operator S (meaning informally "in x for y put z") is formally defined. Taken together with ... 
Nonlinear acoustic propagation in twodimensional ducts
(Acoustical Society of America, 1974)The method of multiple scales is used to obtain a secondorder uniformly valid expansion for the nonlinear acoustic wave propagation in a twodimensional duct whose walls are treated with a nonlinear acoustic material. The ... 
Algebraically growing waves in ducts with sheared mean flow
(Acoustical Society of America, 1974)Standing or traveling waves which vary algebraically with the axial distance in uniform ducts with sheared mean velocity profiles are investigated. The results show that such waves are not possible for ducts with uniform ... 
Nonlinear analysis of the forced response of structural elements
(Acoustical Society of America, 1974)A general procedure is presented for the nonlinear analysis of the forced response of structural elements to harmonic excitations. Internal resonances (i.e., modal interactions) are taken into account. All excitations are ... 
Sound waves in twodimensional ducts with sinusoidal walls
(Acoustical Society of America, 1974)The method of multiple scales is used to analyze the wave propagation in twodimensional hardwalled ducts with sinusoidal walls. For traveling waves,resonance occurs whenever the wall wavenumber is equal to the difference ... 
Parallel_plate waveguide with sinusoidally perturbed boundaries
(American Institute of Physics, 1974)The method of multiple scales is used to obtain a uniformly valid asymptotic expansion for the propagation of TM modes on a parallel_plate waveguide with perfectly conducting boundary surfaces that are sinusoidally perturbed ... 
The Relationship Between the Multiplicative And Mixed Generators Modulo 2^b
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1974), CS74012RMacLaren and Marsaglia [4] comment that their test results suggest that the multiplicative generator performs better than the mixed generator. We attempt to answer the above question by showing that for any sequence of ... 
Transverse vibrations of doubletapered cantilever beams with end support and with end mass
(Acoustical Society of America, 1974)The free vibrations of a doubletapered cantilever beam with (1) end support and (2) end mass have been investigated using the BernoulliEuler equation. The beam was tapered linearly in the horizontal and in the vertical ... 
A Process for Producing Tactually Perceptible Images of Line Drawings for Use by the Blind
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1974), CS74031RA working prototype computer controlled process is described for automatically converting line drawings into raised line images perceptible to the touch. The process uses an automatic digitizer for input and a milling ... 
An Artificial Intelligence Approach to the Symbolic Factorization of Multivariable Polynomials
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1974), CS74019RA new heuristic factorization scheme that uses learning to improve the efficiency of determining the symbolic factorization of multivariable polynomials with integer coefficients and an arbitrary number of variables and ... 
Principle of Optimal Page Replacement and the LRU Stack Model
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1974), CS74023RProgram reference strings generated by the LRU stack model are considered, and expressions for the expected times to next reference for all pages occupying different LRU stack positions are derived. Using these expressions, ...