WorldCat Identities

CARNEGIE INST OF TECH PITTSBURGH PA

Overview
Works: 218 works in 224 publications in 1 language and 229 library holdings
Classifications: QA76.6, 510.7808
Publication Timeline
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Most widely held works by CARNEGIE INST OF TECH PITTSBURGH PA
(NO TITLE)( Book )

3 editions published in 1962 in English and held by 3 WorldCat member libraries worldwide

Contents: Single crystal work, Low temperature studies, Temperature dependence of quadrupoe splitting of Fe-57, Mossbauer isotopes, Hyperfine structure of rare earth compounds, Mossbauer transitions, and Angular correlation of Mossbauer gamma rays
The electrical resistivity of mn3znc between 4.2 k and 630 k( Book )

2 editions published in 1961 in English and held by 2 WorldCat member libraries worldwide

The electrical resistivity of an alloy having approximately the composition Mn3ZnC has been measured between 4.2 K and 630 K. From a high residual value the resistivity increases with temperature in a complicated way up to 550 K, becoming temperature-independent above that point. Two anomalous regions are evident corresponding to the magnetic transitions occurring in this substance at about 230 K and 470 K. The general features of the results are interpreted on the basis of a spin-disorder scattering picture. (Author)
Some studies in game playing with a digital computer( Book )

1 edition published in 1965 in English and held by 2 WorldCat member libraries worldwide

The general trend in artificial intelligence is to try to write programs that have general problem solving ability, rather than ones that are particularly good at one specific task. The program described in this dissertation is designed to play a large number of common board and card games. To play a game in this system, it is necessary to describe the objects used in playing the game and the rules of the game to the system. Each object used in playing the game and the rules of the game to the system. Each object used in the game is represented by a symbol. The properties of that object are kept on a property list associated with that symbol. The rules of the game are represented by a sequence of 'if-then' statements. The 'if' portion of the statement describes the action to be taken if that situation actually exists. Each situation and each action is described in terms of a primitive function of the system. An important part of any game playing program is the routine for searching for the various conditions that can arise in a game. This system contains a fairly efficient general searching routine which will perform most of the searching necessary for any of the common board games. This routine contains some useful automatic methods for using the results of past searches to reduce the amount of searching actually done. An analysis of the concepts needed to play various classes of games shows that only a few fundamental abilities are needed to play most of the common games. These abilities are included in the system. (Author)
The role of particle-hole correlation in the inelastic scattering of electrons from c12, o16, and ca40( Book )

2 editions published in 1963 in English and held by 2 WorldCat member libraries worldwide

All available experimental data on the inelastic scattering of high energy electrons from C-12, O-16, and Ca-40 have been analyzed in terms of the particle-hole models of nuclear excitations. The calculations do not involve any free parameters. The results proved quite sensitive to the treatment of nuclear correlations and generally favored the Random Phase Approximation, which yielded satisfoctory agreement with most of the data. (Author)
FACETING OF COPPER SURFACES AT 1000 C( Book )

1 edition published in 1963 in English and held by 2 WorldCat member libraries worldwide

Polished copper surfaces were observed to facet on annealing at 1000 C in wet hydrogen atmos pheres. The criteria for faceting to occur by the reduction of surface free energy are dis cussed and it is shown that facets near the (111) orientation are thermodynamically stable. The effect of anisotropy of surface free energy on facet nucleation is discussed. (Author)
First order analysis of the operation of the tecnetron in the hypercritical field region( Book )

2 editions published in 1959 in English and held by 2 WorldCat member libraries worldwide

Electric quadrupole splitting and the nuclear volume effect in the ionic compounds of iron-57( Book )

1 edition published in 1962 in English and held by 2 WorldCat member libraries worldwide

Mossbauer spectra have been observed in a number of divalent and trivalent Fe57 ionic compounds at temperatures ranging from 77 K to 300 K. Relative energy shifts of the spectra, characteristic of the particular type of iron ion under investigation, indicate that the charge radius of the Fe57 nucleus is greater in the ground state than in the first excited state. These spectral shifts, when compared to that for the iron atom, indicate that the electron density at the iron nuclei in metallic iron is equivalent to the electron configuration 3d74s1. In addition, the ferrous data clearly show pure electric quadrupole splitting. To interpret quantitatively the data, the Sternheimer polarization factors for the ferrous ion are computed and the quadrupole moment for the first excited state of Fe57 is estimated to be 0.15 barns. A simple model is also suggested to explain the striking temperature dependence of the quadrupole splitting in the ferrous compounds. (Author)
A definition of formula ALGOL by Alan J Perlis( Book )

1 edition published in 1966 in English and held by 2 WorldCat member libraries worldwide

Formula Algol is an extension to ALGOL 60 incorporating formula manipulation and list processing. This paper defines a current version of the Formula Algol language which is implemented on the CDC G-20. (Author)
New proofs of old theorems in logic and formal linguistics by Robert W Floyd( Book )

1 edition published in 1966 in English and held by 2 WorldCat member libraries worldwide

Theorem 1 constructs, from any word problem in a semi-Thue system, an equivalent Post correspondence problem, showing the undecidability of the general Post correspondence problem. Theorem 2 constructs, from any Post correspondence problem, a minimal linear grammar which is ambiguous exactly if the Post correspondence problem has a solution, showing the undecidability of the general ambiguity problem. (Other standard undecidability results on phrase structure grammars are implied.) Theorem 3 constructs, from any word problem in a semi-Thue system, an ambiguity problem, combining the results of Theorem 1 and 2 by more direct means. No new results are presented, but standard proofs were shortened and constructions eliminated, combined, or simplified. (Author)
The resonant circuit dielectric amplifier( Book )

1 edition published in 1956 in English and held by 1 WorldCat member library worldwide

PROBLEMS IN SERVOMECHANISM SYNTHESIS( Book )

2 editions published in 1954 in English and held by 1 WorldCat member library worldwide

STATIC PROPERTIES OF TOROIDAL MAGNETIC CORES( Book )

1 edition published in 1953 in English and held by 1 WorldCat member library worldwide

An investigation was made to establish a correlation between the effects of configuration and material on the static properties of cores. An equation was derived for the effect of core configuration with the assumptions that the dipole axis of every magnetic element in the material is perfectly aligned with the rolling direction of a strip and that every dipole is oriented either parallel or antiparallel with the rolling direction. The validity of the equation was checked by tests on 10 cores constructed from 0.004-in. x 0.5-in. Orthonol strips wound into toroids. In every case the measured permeability was less than the value predicted on the basis of the core dimentsions. The equation derived for the effect of core material was based on the assumptions that a small flat section of magnetic material contains dipoles which reorient themselves according to a normal probability curve with respect to increasing field intensity, and that there are no stable states other than parallel and antiparallel alignment. The experimental results did not confirm this equation, but indicated that the slope of the hysteresis loop depends primarily on the radial dimensions of the core, rather than on the core material
Sequential equivalents of parallel processes by David Lorge Parnas( Book )

1 edition published in 1967 in English and held by 1 WorldCat member library worldwide

This paper introduces the problem of finding a sequential process equivalent to a system of interacting discrete parallel processes. Under the assumption that the sequential process is to be composed exclusively of executions of the individual 'parallel' processes in a predetermined sequence, a method of deriving optimal sequential processes is presented. Applications to the design of simulation systems and picture processing programs are discussed. Examples are taken from logic design and picture processing. (Author)
New method for measuring surface energies and torques of solid surfaces( Book )

1 edition published in 1962 in English and held by 1 WorldCat member library worldwide

A novel technique for determining the surface energy and its derivative with respect to orientation is described. Essentially it involves the floating of a wedge on the substrate, said wedge being made of a material which is not wet by the substrate, i.e., as a greased needle floats on water. A thermodynamic analysis of a system in which the wedge is supported entirely by surface energy is given. If the original surface is not at a cusp orientation, the surface tension is directly measurable from the groove angle formed. If the original surface is at a cusp orientation, there may or may not be a groove depending on the relative values of the derivative with respect to orientation and the weight of the wedge. Experiments primarily on Cu and Ag showed that sapphire, quartz and refractory metal wedges were wet while graphite wedges were not. The technique was demonstrated to work using graphite wedges, but the results obtained were not as accurate as those obtained by other workers using the wire-creep experiments. (Author)
Nuclear collective motion and the shell model( Book )

1 edition published in 1961 in English and held by 1 WorldCat member library worldwide

The collective effects in connection with certain systematic deviations of nuclear properties from the single particle estimate, in particular the giant quadrupole moments, are of a more subtle type than those considered by N. Bohr and Wheeler, and are intimately connected with the independent particle aspects of nuclear structure. In the past few years, these collective effects, as for example, those associated with the giant dipole state, can be incorporated into the shell model itself in terms of an interaction between pairs of shell model particles. The advantage of such a treatment is that it makes it possible to compute, in some detail, quantitative consequences of the interplay between the collective and single particle aspects of nuclear structure. (Author)
A reformulation of the theory of pairing correlations( Book )

1 edition published in 1962 in English and held by 1 WorldCat member library worldwide

A variational approach to the ground state of a many-fermion system is developed with the trial function of condensed pairs proposed by Blatt. The calculation of matrix elements is done by a diagrammatic method which is much simpler than Blatt's. The method is susceptible of generalization to higher correlations. It is also shown that the theory is identical with HartreeBogolyubov theory. The Hartree-Bogolyubov equations are derived from the variational point of view. (Author)
ON THE CORROSION OF SINGLE CRYSTALS, BICRYSTALS AND POLYCRYSTALS OF AN AUSTENITIC STAINLESS STEEL IN BOILING NITRIC ACID( Book )

1 edition published in 1962 in English and held by 1 WorldCat member library worldwide

Single crystals, bicrystals and polycrystals of 20%Cr-20%Ni austenitic stainless steel were corroded in boiling nitric acid. The weight loss was independent of crystallographic orientation, grain size, and heat treatment. Metallographic observations showed no correlation between weight loss and microstructure. Adding 5 g/liter of Cr(6+), which is known to accelerate rates by one to two orders of magnitude, did not change the above conclusions. No significant change in the corrosion rates and morphologies occurred for single and bicrystals, even for those of high carbon (0.06%) and high nitrogen (0.24%) content, after aging under conditions which normally produce marked sensitization in polycrystalline samples. The morphology of attack was a complex combination of pitting and grain boundary attack dependent on thermal history and grain misorientation, but these effects were not reflected in the over-all corrosion rate unless grain dropping occurred
MTHAT assembler for the CDC G-21 by Dan Ross( Book )

1 edition published in 1964 in English and held by 1 WorldCat member library worldwide

MTHAT is a one-pass symbolic assembler for the CDC (formerly Bendix) G-21 computer. It is designed to be used in conjunction with the Carnegie Tech G-21 monitor system. The input to MTHAT is a set of punched cards, or the images of punched cards obtained from either the G-21 control console or the remote teletype units. The outputs are G-21 machine code in the computer memory, usually one word of code for each card input, and a printed assembly listing. There also are provisions for communication between MTHAT and an operator or programmer at the G-21 control console. MTHAT is called a one-pass assembler because usually each input card is processed once only. (Author)
Hydrodynamic Characteristics of Pontons Pertinent to a Study of Their Design and Operation( )

1 edition published in 1954 in English and held by 0 WorldCat member libraries worldwide

AN APPLICATION OF MAGNETIC AMPLIFIER CIRCUITS TO PERFORM MULTIPLICATION AND OTHER ANALYTICAL OPERATIONS( )

1 edition published in 1953 in English and held by 0 WorldCat member libraries worldwide

 
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English (26)