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 ... 
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 ... 
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 ... 
Dynamic Quantum Allocation and SwapTime Variability in TimeSharing Operating Systems
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1973), CS73001RNo abstract available. 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
Three Papers on the Completeness Properties of Abelian Semi groups and Groups
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1974), CS74008RThe three papers presented here all arise from recent research into sets of operators which are sufficient to define a horizontal microlanguage for a computer and which are (in some undefined sense) natural for human ... 
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, ... 
WorkingSetLike Memory Management Algorithms
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1974), CS74025RThis paper considers the design and evaluation of memory management algorithms to be applied to multiprogramming computer systems with virtual memory. The operation of the Denning working set algorithm is studied and ... 
The Automatic Digitizer in Computer Graphics
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1974), CS74029RAn operational hardwaresoftware system is described which rapidly and economically converts hardcopy drawings into graphic data structures faithfully representing both their geometry and their topology. These facilities ...