| Physical Properties of CdTe Films Grown by Hotwall and Molecular Beam Techniques |
JUN 1984 |
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| Authors:
J. F. Schetzina; NORTH CAROLINA STATE UNIV RALEIGH
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 | Results have shown that MBE and hotwall MBE techniques can be employed to grow high quality epitaxial CdTe films, suitable for use as substrates for Hg CdTe film growth, using alternative substrates. In particular, Cdte / (0001) sapphire and CdTe / (100) GaAs provide viable alternatives to bulk CdTe for use as substrates in the 2-5 micrometer and 8-14 micrometer IR regions, respectively. The most recent results indicate that layers ... |
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| Comparison of some Direct Methods for Computing Stationary Distributions of Markov Chains |
JUN 1984 |
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| Authors:
W. J. Harrod; R. J. Plemmons; NORTH CAROLINA STATE UNIV RALEIGH
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| The 'Carolina' Session: Status of Alligatorweed Control in North Carolina, |
JUN 1984 |
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| Authors:
K. A. Langeland; C. A. Nalepa; K. G. Wilson; NORTH CAROLINA STATE UNIV RALEIGH
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| This report reviews the attempts to establish biological control suppressants of alligatorweed in North Carolina and presents preliminary findings of a cooperative effort between North Carolina State University (NCSU) and the North Carolina Department of Agriculture (NCDA) to develop an integrated alligatorweed management program in North Carolina. |
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| A Combined Direct-Iterative Method for Certain M-Matrix Linear Systems |
MAR 1984 |
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| Authors:
R. E. Funderlic; R. J. Plemmons; NORTH CAROLINA STATE UNIV RALEIGH
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| Orthogonal Schemes for Structural Optimization, |
FEB 1984 |
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| Authors:
M. W. Berry; M. T. Heath; R. J. Plemmons; R. C. Ward; NORTH CAROLINA STATE UNIV RALEIGH
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| Historically there are two principal methods of matrix structural analysis, the displacement (or stiffness) the force method has been used relatively little because the displacement method has been deemed easier to implement on digital computers, especially for large sparse systems. The force method has theoretical advantages, however, for multiple redesign problems or nonlinear elastic analysis because it allows the solution of modified problems without restarting the computation from the beginning. ... |
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| Backward Error Analysis for Linear Systems Associated with Inverses of H-Matrices |
1984 |
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| Authors:
M. Neumann; R. J. Plemmons; NORTH CAROLINA STATE UNIV RALEIGH
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| Continuous Versions of the Queuing Formulas L=Lambda W and H=Lambda G |
DEC 1983 |
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| Authors:
T. Rolski; S. Stidham Jr; NORTH CAROLINA STATE UNIV RALEIGH
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| Matrix Diagonal Stability and Its Implications |
SEP 1983 |
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| Authors:
A. Berman; D. Hershkowitz; NORTH CAROLINA STATE UNIV RALEIGH
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| Research in Numerical Linear Algebra and Numerical Methods for Large- Scale Least Squares and Other Problems |
01 AUG 1983 |
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| Authors:
Robert J. Plemmons; NORTH CAROLINA STATE UNIV RALEIGH
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| The research problems studied for the U. S. Army Research Office over the six year period of these grants are each in the research area of Numerical Linear Algebra and Applications. The objectives of the research were to develop new techniques for handling large-scale problems which involve interative or direct methods for solving large sparse systems of linear equations or least squares problems. The topics to be studied included: (1) ... |
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| Effects of High Energy Radiation on the Mechanical Properties of Epoxy Graphite Fiber Reinforced Composites. |
1983 |
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| Authors:
R. D. Gilbert; R. E. Fornes; J. D. Memory; NORTH CAROLINA STATE UNIV RALEIGH
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| The effects of high energy radiation on the mechanical properties and on the molecular and structural properties of graphite fiber reinforced composites were assessed so that durability in space applications can be predicted. Irradiated composites were T300/5208, T300/5209, and C6000/PMR15. (Author, modified). |
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| Fundamental Investigations in Polymer Chemistry |
12 JUN 1982 |
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| Authors:
Vivian T. Stannett; David R. Squire; NORTH CAROLINA STATE UNIV RALEIGH
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| Studies resulted in the first direct proof of chain transfer to solvent in the cationic polymerization of vinyl ethers by both chemical initiation and initiation using radiation. It was shown that incomplete dissociation of the initiator salt can influence the rate constant for polymerization by a factor of three or more. It was discovered that solvent effects can have remarkable effects upon the rate of polymerization. For example it was ... |
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| Development of a Remote Sensing-Aided Digital Databank for Large Scale Land Use Planning, |
JUN 1982 |
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| Authors:
S. Khorram; NORTH CAROLINA STATE UNIV RALEIGH
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| The primary objective of this investigation was to combine remotely-sensed data with ground-acquired data in development of a procedure specifically for selection of a site for urban development and generally for large scale land use planning. The study area, jointly selected by the resource managers and researchers, is approximately 500 sq km in size and covers the Frenchman Reservoir basin in northeastern part of the Sierra Nevada Mountains of California. ... |
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| In Vitro Selection of an Attenuated Variant of Sindbis Virus: Investigation of the Molecular Basis for Attenuation |
MAY 1982 |
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| Authors:
Robert E. Johnston; NORTH CAROLINA STATE UNIV RALEIGH
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| Adaptation of virulent viruses to an alternate host, either animal or tissue culture, has long been recognized as a means of attenuating virulence for the natural host. The molecular mechanism(s) involved in attenuation by blind passage in tissue culture is not understood. One explanation for this phenomenon is that virus replication involves many specific interactions between virus- derived and host-derived products. Selection in a particular host cell for virus mutants ... |
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| Properties and Residual Stresses in Angle-Ply Polymer Matrix Composites |
MAR 1982 |
219 pages |
| Authors:
Abdel A. Fahmy; Harvey A. West; Mark A. Elkins; NORTH CAROLINA STATE UNIV RALEIGH
|
 | A series of samples of graphite/epoxy, glass/epoxy, and Kevlar epoxy were prepared. In addition, hybrids of glass epoxy and Kevlar epoxy were laid up in various configurations. The samples were subjected to hygro-thermal cycling and properties in the through-the-thickness direction were measured as a function of cycling. Thermal expansion and residual stress measurements were made and the effect of ply orientation was determined on both the hybrid and standard composites. ... |
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| LU Decompositions of Generalized Diagonally Dominant Matrices |
17 DEC 1981 |
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| Authors:
R. E. Funderlic; M. Neumann; R. J. Plemmons; NORTH CAROLINA STATE UNIV RALEIGH
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| Selection of Variables to be Used in Statistical Analysis of Field-Measured Soil Water Content |
NOV 1981 |
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| Authors:
D. K. Cassel; L. A. Nelson; NORTH CAROLINA STATE UNIV RALEIGH
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| Interpretation and inferences drawn from soil water content measurements collected in agronomic field studies are dependent upon the particular method of data analysis. The purpose of this study was to examine alternative approaches for analyzing soil water content data measured by neutron attenuation. Data from tillage studies conducted at two locations on the Atlantic Coastal Plain were used to demonstrate and compare the methods of data analysis. Analysis of variance ... |
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| Effect of Particle Surface Roughness on Mechanical Impedance of Coarse-Textured Soil Materials |
NOV 1981 |
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| Authors:
R. M. Cruse; D. K. Cassel; R. E. Stitt; F. G. Averette; NORTH CAROLINA STATE UNIV RALEIGH
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| Packing energy required to increase bulk density in coarse-textured soils is influenced by particle surface roughness, i.e., by interparticle friction. It was, therefore, hypothesized that particle surface roughness would influence soil resistance to movement of a cone penetrometer, because soil bulk density is increased in the zone surrounding the penetrometer measurements, and C.I. was compared in both disturbed and undisturbed coarse-textured soil material, with each soil having a unique particle ... |
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| Effects of Soil Sample Size and Included Root and Wood on Bulk Density in Forested Soils |
JAN 1981 |
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| Authors:
T. A. Terry; D. K. Cassel; A. G. Wollum; NORTH CAROLINA STATE UNIV RALEIGH
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| Obtaining reliable estimates of bulk density of forested soils can be an arduous task. Soils are not uniform as a result of variable textures and depths of surface horizons, incorporated wood and other debris, and the presence of densely matted layers of surface roots. This study was designed to determine the effects of soil sample size and root and wood volume-weight corrections on bulk density in bedded and nonbedded plots ... |
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| Effect of Particle Surface Roughness on Densification of Coarse-Textured Soil |
JUL 1980 |
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| Authors:
R. M. Cruse; D. K. Cassel; F. G. Averette; NORTH CAROLINA STATE UNIV RALEIGH
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| Soils on the Atlantic Coastal Plain compact to different bulk densities under the same compactive effort. It is hypothesized that densification differences observed among Ap horizon materials of these soils are partially due to variations in soil particle surface roughness. Surface ruoghness of Coastal Plain soil materials and sand size fractions derived from these materials were photographed and/or characterized by measuring the dense soil angle of response (DSAR) over a ... |
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| Drain Depth and Subirrigation in Layered Soils |
JUN 1980 |
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| Authors:
Yau K. Tang; R. Wayne Skaggs; NORTH CAROLINA STATE UNIV RALEIGH
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| The Richards equation for two-dimensional saturated-unsaturated water movement was solved for subirrigation from buried drains in layered soils. Numerical solutions were obtained for soils that have subsurface layers with high hydraulic conductivities. Results showed that increasing the drain depth so that it approaches or penetrates a high conductivity bottom layer will reduce head loss due to convergence near the drain. Deeper drains significantly increased subirrigation rates for deep soils and ... |
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| Analytical-Numerical Computation of Infiltration |
JUN 1980 |
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| Authors:
Antonis D. Koussis; Siu-Lun Chow; NORTH CAROLINA STATE UNIV RALEIGH
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| An approximate, analytical-numerical solution has been developed for one-dimensional, vertical infiltration of water into soil. The soil diffusivity is assumed to vary either exponentially or as a power law; however, other analytical formulations can also be accomodated. The solution is physically based, involving parameters related to the soil properties, and is valid for 'short times' of infiltration. Its center piece is a simple, rapid, and sufficiently accurate solution for the ... |
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| The Effect of Sand Content Upon Cone Index and Selected Physical Properties |
APR 1980 |
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| Authors:
C. W. Byrd; D. K. Cassel; NORTH CAROLINA STATE UNIV RALEIGH
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| Soil collected from an induced tillage pan in the A2 horizon of a Norfolk sandy loam soil was fractioned into sand, silt, and clay separates and reconstituted yielding 4 soil textures, each having approximately 5% clay, but with sand percentages ranging from 66.6 to 82.2%. Twelve soil cores for each texture were packed to bulk densities of 1.79 + or - 0.03 g/cu cm. The cone indices for the undisturbed ... |
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| Microstrip Antenna Technology, |
05 MAR 1980 |
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| Authors:
Keith R. Carver; James W. Mink; NORTH CAROLINA STATE UNIV RALEIGH
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| Effect of High Energy Radiation on Mechanical Properties of Graphite Fiber Reinforced Composites |
80 |
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| Authors:
N. Naranong; NORTH CAROLINA STATE UNIV RALEIGH
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| This investigation dealt with testing the flexural strength and average modulus of graphite fiber reinforced composites (graphite/epoxy, graphite/polyimide, graphite/polysulfone) before and after exposure to 0.5 Mev electron radiation and 1.33 Mev gamma radiation by using a three-point bending test (ASTM D-790). The irradiation was conducted on vacuum treated samples. The dosages were up to 5000 Mrad for electron radiation and 360 Mrad for gamma radiation. The effect of both types ... |
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| Flood Tidal Delta in a New Barrier Island Tidal Inlet |
1980 |
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| Authors:
Jerry L. Machemehl; William Forman; NORTH CAROLINA STATE UNIV RALEIGH
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| A new tidal inlet was opened between Core Sound and the Atlantic Ocean in North Carolina by the U.S. Army Corps of Engineers in Dec 1971. A study was initiated at the new inlet: (1) to evaluate the response of the flood tidal delta (Flood shoal) to ocean currents, (2) to investigate the growth pattern of the flood tidal delta, and (3) to develop a sediment budget for the inlet ... |
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| Effects of High Energy Radiation on the Mechanical Properties of Epoxy/ Graphite Fiber Composites. |
31 OCT 79 |
|
| Authors:
R. E. Fornes; J. D. Memory; NORTH CAROLINA STATE UNIV RALEIGH
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| The effects of electron and gamma radiation on the breaking stress and Youngs modulus of graphite fiber reinforced epoxy (T300/5208 and T300/3501 6) composites were determined by three point bending tests. A graphite fiber reinforced polyimide (C6000/PMR15) was also tested. The statistical treatment of the data is reported and suggest an appreciable half-life for these materials in space applications before their strength and stiffness properties would be affected significantly. (LS). ... |
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| Optimal Project Compression with Due-Dated Events, |
1979 |
|
| Authors:
S. E. Elmaghraby; P. S. Pulat; NORTH CAROLINA STATE UNIV RALEIGH
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| Thermomechanical Behavior of Unannealed NbCx Single Crystals |
20 NOV 1978 |
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| Authors:
B. B. Yu; R. F. Davis; NORTH CAROLINA STATE UNIV RALEIGH
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| Fundamental Concepts in Discrete Optimization as Related to Classes of Scheduling Problems. |
10 NOV 1978 |
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| Authors:
Salah E. Elmaghraby; NORTH CAROLINA STATE UNIV RALEIGH
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| Work accomplished over the first three years (1972-75) may be summarized as follows: (1) An extensive study of models for optimally scheduling lots of N products on a single processor under various demand process structures. (2) Solution of a problem of scheduling N jobs on parallel processors to minimize a penalty function based on job due dates when there are no precedence relations among jobs. (3) Two studies treating the ... |
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| Near-Surface Effect in Self-Diffusion in NbCx |
04 OCT 1978 |
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| Authors:
B. B. Yu; R. F. Davis; NORTH CAROLINA STATE UNIV RALEIGH
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| Thickness Properties of Laminated Fiber Composites. |
24 APR 1978 |
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| Authors:
A. A. Fahmy; NORTH CAROLINA STATE UNIV RALEIGH
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| The elastic and thermal expansion properties of angle-ply laminated fiber composites are evaluated experimentally and analytically. These include properties in or involving the thickness direction of the laminates. Stress-strain behavior of the laminates under compression in the thickness direction is described and discussed. (Author) |
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| Investigation of Microprogrammable Microprocessors. |
16 MAY 1977 |
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| Authors:
Yale N. Patt; James W. Hanson; NORTH CAROLINA STATE UNIV RALEIGH
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| This report briefly summarizes the work performed under Grant DAAG-29-76-G-0071 Extensive technical reports covering the simulator package and the CDC-469 emulated developed under this contract have been submitted to Frankford Arsenal for publication. (Author) |
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| Digroup Data Reduction Techniques. |
MAY 1977 |
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| Authors:
J. B. O'Neal Jr.; R. W. Stroh; NORTH CAROLINA STATE UNIV RALEIGH
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| This report describes a study made to determine the best speech data compression system to use in compressing the output of two T1 carrier systems down into the transmission rate normally occupied by one T1 system. The study contains a review of previously proposed speech compression techniques, a more detailed consideration of three candidate systems for this application and the rationale for selecting ADPCM/TASI as the most suitable system. ADPCM/TASI ... |
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| Research on Nonlinear Differential Equations. |
26 OCT 1976 |
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| Authors:
Robert H. Martin Jr; NORTH CAROLINA STATE UNIV RALEIGH
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| The research described in this report deals with the existence and behavior of solutions to nonlinear differential equations in a Banach space. This includes the determination of invariant sets for solutions, relations involving inequalities between solutions, and global existence and asymptotic properties (stability) of solutions. The abstract techniques and results developed of differential equations in Banach spaces are applied to semilinear parabolic systems. These examples indicate that several classical as ... |
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| Dune Stabilization with 'Panicum amarum' along the North Carolina Coast. |
FEB 1976 |
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| Authors:
E. D. Seneca; W. W. Woodhouse Jr.; S. W. Broome; NORTH CAROLINA STATE UNIV RALEIGH
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| This study was conducted to determine the dune stabilizing and dune building potential of Panicum amarum (bitter panicum) along the North Carolina coast. Experimental plantings with emphasis on bitter panicum together with Ammophila breviligulata (American beachgrass) and Uniola paniculata (sea oats) were made at two coastal locations. On a sandy site about 300 meters inland where there was relatively little sand moving, bitter panicum contributed more of the estimated cover ... |
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| Fundamental Investigations in Polymer Chemistry. |
25 JUN 1975 |
|
| Authors:
Vivian T. Stannett; David R. Squire; NORTH CAROLINA STATE UNIV RALEIGH
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| Summarized are the authors' studies on the radiation initiated polymerization of vinyl monomers dose rates up to only 250 rads per second. Their publications are listed. |
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| An Experimental Investigation of Late-Stage Equivalence for the Axial Hypo- and Hypervelocity Impact of Rods. |
NOV 1974 |
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| Authors:
J. J. Kelly; R. A. Douglas; NORTH CAROLINA STATE UNIV RALEIGH
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| This report describes the development of a diffraction-grating strain-measurement system capable of measuring axial surface strains in target rods experiencing axial hypo- and hypervelocity impact and its subsequent application to evaluate the existence of the late-stage equivalence principle for this impact configuration. |
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| The Life Cycle of Plasmodium '(Plasmodium) youngi' Eyles, Fong, Dunn, Guinn, Warren, and Sandosham, 1964 (Protozoa: Plasmodiidae), a Parasite of Gibbons. |
01 SEP 1974 |
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| Authors:
Richard G. Andre; NORTH CAROLINA STATE UNIV RALEIGH
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| The specific objectives of this study were to determine the exoerythrocytic cycle of P. youngi, to ascertain the erythrocytic cycle of this parasite, to transmit experimentally the gibbon malaria from infected animals to non-infected animals using colonized Anopheles Meigen mosquitoes, and to study the sporogonic cycle of the malarial organism in certain anophelines. |
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| Propagation of Spartina alterniflora for Substrate Stabilization and Salt Marsh Development. |
AUG 1974 |
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| Authors:
W. W. Woodhouse Jr.; E. D. Seneca; S. W. Broome; NORTH CAROLINA STATE UNIV RALEIGH
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| Techniques were developed for propagation of Spartina alterniflora Loisel., smooth cordgrass, in the intertidal zone on dredge spoil and eroding shorelines. Both seeding and transplanting methods were successful. Transplants proved to be more tolerant of rigorous conditions such as storm waves and blowing sand, but seeding was more economical and was successful on protected sites. Vegetative development of seeded and transplanted areas was rapid with primary production equal to that ... |
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| Interior Stresses from Shaped Strips of Explosive Detonating on a Plate Edge. |
JUL 1974 |
|
| Authors:
R. A. Douglas; V. Horie; W. L. Liddell; R. S. Steele; NORTH CAROLINA STATE UNIV RALEIGH
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| A preliminary analytical and experimental investigation is made of technique for focusing explosively-generated stress waves, with the possibility of stressing selected interior points in a body more highly than points on the surface. Strain-time data are reported for twenty-five tests involving a steel plate stressed dynamically along one edge by detonating, on that edge, a shaped strips of explosive. Test results show that some explosive configurations do sustain or even ... |
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| Experimental Determination of Dynamic Stress-Strain Relationships During Wave Propagation in Brittle Materials. |
JUN 1974 |
|
| Authors:
R. S. Steele; R. A. Douglas; NORTH CAROLINA STATE UNIV RALEIGH
|
| This report describes in detail the calibration and application of the foil manganin alloy gage for monitoring dynamic one dimensional stresses in axially impacted rods. The total response of the gage is shown to have both a normal stress component and a plane strain component. Tests are described which determine the relationship between these components and the total response. Limits on the usable strain and stress ranges of the manganin ... |
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| Telecommunications and Terminals. Advanced Hybrid Computer Systems. |
JUN 1974 |
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| Authors:
Donald C. Martin; NORTH CAROLINA STATE UNIV RALEIGH
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| This Telecommunications and Terminals Report for Advanced Hybrid Computer System considers techniques needed to transmit multiple channels of analog data over the telephone network. The practical limitation of analog data transmission is evaluated. The report recommends that the analog data be digitized for transmission by digital methods. Methods of connection for both local and remote hybrid terminals is discussed as well as approximate cost for some specific transmission speeds. The ... |
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| Interagency Symposium on University Research in Transportation Noise (2nd) Held at North Carolina State Univ., Raleigh on June 5-7, 1974. Book of Proceedings, Volume I. |
JUN 1974 |
|
| Authors:
NORTH CAROLINA STATE UNIV RALEIGH
|
| The intent of the Second Interagency Symposium on University Research in Transportation Noise was to continue to focus attention on university research in basic and applied noise problems related to transportation. The purpose of these proceedings is to record and discuss current research studies, and objectives of research programs. Volume I of the proceedings covers papers presented on aerodynamic noise, noise from flow interaction with solid bodies, rotor noise, and ... |
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| Interagency Symposium on University Research in Transportation Noise (2nd) Held at North Carolina State University, Raleigh on June 5-7, 1974. Book of Proceedings, Volume II. |
JUN 1974 |
|
| Authors:
NORTH CAROLINA STATE UNIV RALEIGH
|
| Volume II of the Proceedings covers papers presented on selected problems II, Societal problems, combustion noise, duct acoustics. |
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| Studies in Deformation and Fracture. |
15 JAN 1974 |
|
| Authors:
William W. Austin; George Mayer; NORTH CAROLINA STATE UNIV RALEIGH
|
| The effects of crystallite orientation upon the formation of deformation bands in alpha- iron are determined, along with the influence of crystallite orientation and size upon strength of polycrystalline iron. The application of thermomechanical processing methods to semicrystalline polymers produces marked strengthening in bulk nylon 6/6, and several modes of fracture are related to the thermal and mechanical history. Attempts to form aluminum-alumina composites by deformation processing procedures do not ... |
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| A Preliminary Experimental Investigation of the Manganin Stress Transducer. |
DEC 1973 |
|
| Authors:
R. S. Steele; R. A. Douglas; NORTH CAROLINA STATE UNIV RALEIGH
|
| The report contains the preliminary development of a manganin foil stress gage for use in monitoring one dimensional stress waves occurring in axially impacted rods. The results of tests used to calibrate the manganin foil gage to uniform radial strain are presented. These data are used in conjunction with the response of the gage to simultaneously applied axial compression and Poisson straining to find an empirical expression relating the response ... |
|
| Electron Spin Resonance Studies of Luminescent Transition Metal Complexes, |
22 OCT 1973 |
|
| Authors:
M. Keith DeArmond; NORTH CAROLINA STATE UNIV RALEIGH
|
| Nonradiative transitions in transition metal complexes are discussed. Emission and absorption spectra presented for (d3)Cr(+3) and (d6)Rh(+3), Ir(+3) and Ru(+2) complexes permit classification of the emission as localized orbital (d-d) or delocalized orbital. Quantum, yield, lifetime data and high resolution spectra for localized orbital complexes indicate that phosphorescence is the dominant type emission. Delocalized orbital emitters (d6 here) behave as Pi electron hydrocarbon emitters. The general Robinson-Frosch theory of nonradiative ... |
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| Research on Differential Equations and Generalized Functions. |
05 SEP 1973 |
|
| Authors:
Raimond A. Struble; NORTH CAROLINA STATE UNIV RALEIGH
|
| A research project on the topics of differential equations and operator equations, generalized functions, and neutron transport and diffusion systems is briefly summarized. (Author) |
|
| Stress-Optical Behavior of Inorganic Glasses. |
10 AUG 1973 |
|
| Authors:
A. A. Ahmy; NORTH CAROLINA STATE UNIV RALEIGH
|
| The report briefly summarizes research concerning the stress-optical coefficients of SiO2, soda-lime Silicate, and alkali borosilicate glasses as a function of temperature from room temperature up to the annealing point of each. The relaxation time for the relaxation of birefringee in strained SiO2 glass was measured as a function of temperature up to 950C. |
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| Experimental Investigation of the Rapid Loading of Clamped Circular Plates by an Electrical Discharge in Water. |
AUG 1973 |
|
| Authors:
J. D. Williams III; F. Y. Sorrell; R. A. Douglas; NORTH CAROLINA STATE UNIV RALEIGH
|
| A high voltage, high current electrical discharge is used to produce a shock wave in water which is then reflected from a plate in order to produce rapid loading of the plate. Discharge energies of 1400 to 2800 joules are used to load 6 inch diameter polycarbonate (Lexan) clamped circular plates. The center deflection of the plate is measured as a function of time by using a touch wire technique. ... |
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Reports by Corporate Author
