| The Embrittlement of Alloys Under Impulse Thermal, Pressure and Chemical Conditions. |
APR 1980 |
|
| Authors:
A. Kahn; PRINCETON UNIV N J
|
 | During the past two years, we directed our metallurgical study of the embrittlement of bore surfaces toward the examination of the composition of large-calibre gun barrel surfaces via the combines SEM/SAM (Scanning Electron Microscope/Scanning Auger Microprobe) techniques. In this final report, we outline the principal results of this study. (Author) |
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| The Application of Difference Methods in Fluid Mechanics. |
JUN 1979 |
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| Authors:
Sin-I Cheng; PRINCETON UNIV N J
|
| This report outlines the objective and the progress made in achieving some understanding of the difference solutions of complex flow problems in fluid mechanics, which are inevitably computed at rather coarse meshes. We developed a set of difference algorithms, analyzed them as to the behavior of the 'errors' of the difference solutions of some model problems, and then applied them in the computational solution of the two dimensional interaction fields ... |
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| Gasdynamic Modeling and Computational Accuracy, |
12 OCT 1977 |
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| Authors:
Gregory Shubin ; Sin-I Cheng; PRINCETON UNIV N J
|
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| Low-Frequency Thermomechanical Spectrometry of Polymeric Materials: Tactic Polymethylmethacrylates. |
JUN 1976 |
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| Authors:
S. J. Stadnicki; J. K. Gillham; Y. Hazony; PRINCETON UNIV N J
|
| A computerized and automated torsional pendulum has been used to characterize amorphous polymethylmethacrylates at about 1 Hz in the temperature sequence 473 to 93 to 473 K. The effects of thermal prehistory, temperature cycling, water content and tacticity are demonstrated. In particular, a comparison of the out-of-phase shear modulus (G') versus temperature for 'syndiotactic,' 'atactic' and 'isotactic' polymer specimens shows that the intensity of the glassy-state beta loss peak decreases ... |
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| Evaluation of Additives to Reduce Solid Propellant Flammability in Ambient Air. |
DEC 1975 |
91 pages |
| Authors:
Leonard H. Caveny; Anthony Z. Mackiewicz; Martin Summerfield; PRINCETON UNIV N J
|
 | An experimental investigation to obtain an understanding of how chemical additives (i.e., flame inhibitors, char formers, and coolants) intended to reduce the likelihood of accidental ignition and flammability affect the combustion of high energy propellants in ambient air. Several composite propellants were made more resistant to ignition. However, test results for high energy propellants revealed that (once ignition occurred) the continual resupply of reactants (both air and propellant products) overwhelms ... |
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| Ignition Transients and Pressurization in Closed Chambers. |
NOV 1975 |
37 pages |
| Authors:
Leonard H. Caveny; Martin Summerfield; Carl W. Nelson; PRINCETON UNIV N J
|
| Pressure versus time data obtained from igniting and burning propellants in highly loaded closed chambers (loading densities between 0.1 and 0.3 g/cc) are being used to evaluate propellants in empirical quality and production control procedures. Interpretations obtained from such production control devices are hampered by uncertainties concerning ignition delays, dynamic burning, heat loss, propellant surface area versus distance burned, and real gas effects. In this study, attention is focused on ... |
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| Defect-Property Relationships in Solids. Proceedings of the Materials Research Society Conference Held at Princeton University, Princeton, New Jersey on March 24 and 25, 1975. |
OCT 1975 |
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| Authors:
PRINCETON UNIV N J
|
| Contents: Defect-property relationships in solids; Structure and properties of glassy metals; Structure study of a metallic glass using positron annihilation methods; Void initiation, growth, and coalescence in ductile fracture of metals; Cavitation processes in fracture of metals and alloys; Electromigration and spatial variations in metallic conductivity; An elasto-chemical theory of tilt boundaries; Microstructure-critical current relationships in hard superconductors; Neutron irradiation effects in superconducting A-15 compounds; Flux change in type II ... |
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| Polydichlorophosphazene: Thermomechanical Behavior. |
Feb 1975 |
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| Authors:
T Connelly; Jr M; J K Gillham; PRINCETON UNIV N J
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| Dynamic mechanical data (about 1 Hz) for the inorganic polymer polydichlorophosphazene (NPCl2)n are presented for the temperature range - 180 to 350C. Transitions are located and the effect of high temperature on the transitions and the thermomechanical behavior are examined. |
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| Zero-Field Paramagnetic Resonance of Trivalent Gadolinium in Several Lanthanon Tris(Ethylsulfate) Nonahydrates and Nonadeuterates--Determination of Crystal Field and Hyperfine Structure Parameters. |
01 JUN 1974 |
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| Authors:
E. R. Bernstein; G. M. Dobbs; PRINCETON UNIV N J
|
| Employing isotopically pure trivalent 155Gd, 157Gd, and 160Gd as guests in dilute mixed crystals of lanthanum tris(ethylsulfate) nonahydrate (La3(C2H5SO4)3.9H2O), it has been possible to determine both accurate zero-field splitting parameters of crystal field origin and hyperfine structure constants due to magnetic dipole and electric quadrupole interaction terms. The zero-field paramagnetic resonance spectroscopic method is used. It is reasoned that the quadrupole hyperfine constant is due, almost entirely, to lattice contributions; ... |
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| LABORATORY EXPERIMENTS ON PARAMETRIC INSTABILITIES AND PLASMA HEATING IN A MAGNETIC FIELD, IN: AGARD CP-138, PAPER NO8 |
MAY 1974 |
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| Authors:
M. PORKOLAB; PRINCETON UNIV N J
|
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| Low frequency thermomechanical spectrometry of polymeric materials: COMPUTERIZED TORSIONAL BRAID EXPERIMENTS. III. tactic polymethylmethacrylates. |
APR 74 |
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| Authors:
J. K. Gillham; S. J. Stadnicki; Y. Hazony; PRINCETON UNIV N J
|
| An automated instrument for torsional braid analysis which includes on-line reduction of data was used to characterize amorphous syndiotactic, atactic, and isotactic polymethylmethacrylates at about 1Hz in the temperature range 473 93 K. Polymer-braid composite specimens were prepared by impregnating multifilamented glass braids in 10% solutions of the polymers in tetrahydrofuran. Solvent was removed and thermo-mechanical spectra were obtained. Spectra of syndiotactic, atactic, and isotactic polymethylmethacrylates are presented in terms ... |
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| Low frequency thermomechanical spectrometry of polymeric materials: COMPUTERIZED TORSIONAL BRAID EXPERIMENTS - II. data processing. |
APR 74 |
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| Authors:
S. J. Stadnicki; J. K. Gillham; Y. Hazony; PRINCETON UNIV N J
|
| Data processing in the Hierarchical Computer System used with a Tor- sional Braid Analysis apparatus is described. On-line data acquisition and preprocessing are performed by computer situated in the experimental laboratory. The data reduction program employs a linear least mean squares fit of the data to the differential form of the equation of motion, is written in Fortran, and is processed in a batch computer. An intermediate computer is employed ... |
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| Low frequency thermomechanical spectrometry of polymeric materials: COMPUTERIZED TORSIONAL BRAID EXPERIMENTS -I. overview. |
APR 74 |
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| Authors:
Y. Hazony; S. J. Stadnicki; J. K. Gillham; PRINCETON UNIV N J
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| The results of the on-line interface of the Torsional Braid Analysis experiment to an Hierarchical Computer System for data acquisition, data reduction and control of experimental variables is discussed. Some experimental results are demonstrated and the data reduction procedures are outlined. Several modes of presentation of the final computer-reduced data are discussed in an attempt to elucidate possible interrelations between the thermal variation of the rigidity and loss parameters. (Author, ... |
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| Development of a fully automated torsional pendulum with built-in data reduction facilities. |
APR 74 |
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| Authors:
C. L. M. Bell; J. K. Gillham; J. A. Benci; PRINCETON UNIV N J
|
| The report describes a fully automated torsional pendulum interfaced with a dedicated data analyzer. A repetitive sequence consisting of alignment of the optical transducer, initiation of free oscillations, and print-out of temperature, logarithmic decrement and period for each damped wave, operates automatically throughout an experiment. Thermomechanical data are presented for cis-and trans-1,5- polypenten-amers so as to demonstrate use of the instrument in polymer character-ization. (Author-PL) ANNOTATION: Development of a fully ... |
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| Recent Advances in Polymer Science, |
17 SEP 1973 |
|
| Authors:
G. L. Wilkes ; B. Maxwell; PRINCETON UNIV N J
|
| The two papers of interest in this symposium are on the topics of relaxation of damped Debye lattices and stress relaxation. (TSJ). |
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| Stress wave calculations in composite plates using the fast Fourier transform. |
SEP 73 |
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| Authors:
F. C. Moon; PRINCETON UNIV N J
|
| The protection of composite turbine fan blades against impact forces has prompted the study of dynamic stresses in composites due to transient loads. The mathematical model treats the laminated plate as an equivalent anisotropic material. The use of Mindlin's approximate theory of crystal plates results is five two-dimensional stress waves. Three of the waves are flexural and two involve in-plane extensional strains. The initial value problem due to a transient ... |
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| A CRITICAL SURVEY OF WAVE PROPAGATION AND IMPACT IN COMPOSITE MATERIALS. |
MAY 73 |
|
| Authors:
F. C. Moon; PRINCETON UNIV N J
|
| A review of the field of stress waves in composite materials is presented covering the period up to December 1972. The major properties of waves in composites are discussed and a summary is made of the major experimental results in this field. Various theoretical models for analysis of wave propagation in laminated, fiber and particle reinforced composites are surveyed. The anisotropic, dispersive and dissipative properties of stress pulses and shock ... |
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| Application of pyrolysis-mass chromatography to polymer degradation. |
MAY 73 |
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| Authors:
E. Kiran; J. K. Gillham; PRINCETON UNIV N J
|
| The degradation of polyisobutylene, polypropylene, polystyrene and a series of aliphatic polysulfones is used to illustrate the capabilities of mass chromatography. The analytical system is briefly described, including operating conditions, columns, and instrument calibration. A pyrolyzer with programming capability was coupled in series with a thermal conductivity cell and a mass chromatograph. The thermal conductivity cell traps decomposition products selectively and also provides data that are complementary to thermogravimetric and ... |
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| Dynamic mechanical analysis of epoxy/aromatic amine reactions. |
MAY 73 |
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| Authors:
R. G. Babayevsky; J. K. Gillham; PRINCETON UNIV N J
|
| The cure transitions and cure kinetics of some epoxy/aromatic diamine systems were analyzed through their dynamic mechanical behavior under isothermal conditions using torsional braid analysis. This analysis showed that depending on the temperature of cure, there are three different types of dynamic mechanical behavior. The results of dynamic mechanical monitoring of the isothermal cure of stoichiometric mixtures of the epoxy/aromatic diamines were used to determine kinetic parameters of the reaction. ... |
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| Pyrolysis-mass chromatography of polymers. |
MAY 73 |
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| Authors:
E. Kiran; J. K. Gillham; PRINCETON UNIV N J
|
| Thermal degradation of polyethylene is investigated using pyrolysis- mass chromatography techniques. A series combination of a pyrolyzer with programming capability, a thermal conductivity cell which permits selective trapping, and a mass chromatograph as applied to polymer degradation are discussed. The results suggest that pyrolyzer-thermal conductivity- mass chromatograph gives the molecular weight of constituents of pyrolysis with useful accuracy and probably with greater ease than conventional methods. (P.S.- PL) ANNOTATION: Pyrolysis-mass ... |
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| Polyimides: structure-property relationships by torsional braid analysis. |
APR 73 |
|
| Authors:
J. K. Gillham; H. C. Gillham; PRINCETON UNIV N J
|
| The thermomechanical spectra and transitions of systematically related polyimides synthesized from four aromatic dianhydrides and ten aromatic diamines are discussed with respect to structure-property relationships. In displaying two main transitions, Tg and T BETA, MOST OF THE POLYMERS BEHAVE AS AMORPHOUS MATERIALS SUCH AS PMMA. A DIFFERENT MECHANISM FOR THE RELAXATIONS IS INVOKED WHICH INVOLVES MORE INTERMOLECULAR INTERACTION FOR THOSE POLYMERS (from pyromellitic dianhydride) which give more complex behavior. Difficulties ... |
|
| Statistical Research at Princeton University Supported by the Army Research Office. Part II. |
1973 |
|
| Authors:
John W. Tukey; PRINCETON UNIV N J
|
| A series of statistical research studies conducted at Princeton University over the period 1956 - 1973 is briefly summarized. Included are (1) contributions combining experimental design and data analysis; (2) contributions to experimental designs (to patterns of experiment or observation); (3) contributions to estimation; (4) contributions to confidence procedures and tests; (5) contributions to exploration, to reformulation and to adjustment preparatory to reanalysis; (6) improved tools for statistical theory. |
|
| Helicopter Station Keeping. |
SEP 1972 |
|
| Authors:
Theodor A. Dukes; PRINCETON UNIV N J
|
| ION, LEADS TO AN EMPHASIS ON THE STATION KEEPING CONTROL LOOP. The most essential topics are brought into focus in order to reveal and to emphasize the basic relationships which must be considered in decisions about formation flight system features and requirements. The significance of leader-to-follower data communication is explored in detail. Nominal station keeping trajectories are defined in terms of the motion of a nominal point coordinate system. The ... |
|
| Kinetics and Mechanisms of the Reactions of Atomic Fluorine with CF3I and CCl3Br. |
SEP 1972 |
|
| Authors:
Joseph Bozzelli; Myron J. Kaufman; PRINCETON UNIV N J
|
| Using molecular beam analysis, the kinetics and mechanisms of the reactions of atomic fluorine with CF3I and CCl3Br have been investigated in a fast-flow reactor. Direct observation of perhalomethyl radicals and lack of detection of displaced halogen atoms proves conclusively that both of these reactions proceed primarily by abstraction, rather than displacement, of a halogen atom. In the CCl3Br system, successive 'atom-switching' reactions rapidly convert CCl3 to its fluorinated analogs. ... |
|
| The Princeton Pennsylvania Army Avionics Research Program. Elements of Helicopter Hovering and Near Hover Operations with a Sling Load. |
SEP 1972 |
|
| Authors:
Theodor A. Dukes; PRINCETON UNIV N J
|
| , DAMPING, EQUATIONS OF MOTION, PITCH(MOTION), MATHEMATICAL MODELS, CONTROL SYSTEMSCOMPUTERIZED SIMULATION, FEEDBACK CONTROLThree aspects of hovering and near-hover maneuvering of helicopters with sling loads are investigated. An elementary helicopter-load model is developed for the case of large attitude rate damping and is used to identify the most significant parameters and their effects on the dynamics. Various feedback loop closures are explored for their usefulness to provide damping to the pendulous ... |
|
| Thermomechanical behavior of poly-L-alpha-alkyl-amino acids in dry and moist nitrogen. |
AUG 72 |
|
| Authors:
R. R. Krug; J. K. Gillham; PRINCETON UNIV N J
|
| This report summarizes the thermomechanical effects of a systematic variation in the strucutre of a polypeptide series. The number of carbone atoms in the polypeptide side chain is varied from 0 to 4 (excluding 2) in the series: poly-L-glycine, poly-L- alanine, poly-L-valine, and poly-L-leucine. (Author, modified-PL) ANNOTATION: Thermomechanical behavior of poly-L-alpha-alkyl-amino acids in dry and moist nitrogen. |
|
| Dynamic mechanical analysis of epoxy/diamine reactions under isothermal conditions. |
AUG 72 |
|
| Authors:
P. G. Babayevsky; J. K. Gillham; PRINCETON UNIV N J
|
| Torsional and flexural braid analysis are used to analyze the cure transitions and cure kinetics of some epoxy/aromatic diamine systems under isothermal conditions. (Author, modified-PL) ANNOTATION: Dynamic mechanical analysis of epoxy/diamine reactions under isothermal conditions. |
|
| Dynamic mechanical and thermal properties of the stratum corneum layer of epidermis. |
AUG 72 |
|
| Authors:
G. L. Wilkes; PRINCETON UNIV N J
|
| Dynamic mechanical spectroscopy is used to study the thermomechanical character of the stratum corneum, the outer layer of the mammalian epidermis. Wide angle x-ray diffraction and differential thermal analysis were also utilized. (Author, modified-PL) ANNOTATION: Dynamic mechanical and thermal properties of the stratum corneum layer of epidermis. |
|
| Review: torsional braid and torsional pendulum analysis of polymers. |
AUG 72 |
|
| Authors:
J. K. Gillham; PRINCETON UNIV N J
|
| The torsional pendulum, a dynamic mechanical method for examining thermomechanical behavior of solid polymers, has been extended by torsional braid analysis to permit the examination of semimicro amounts of polymers without restrictions to their physical state. (Author, modified-PL) ANNOTATION: Review: torsional braid and torsional pendulum analysis of polymers. |
|
| The melting and dynamic mechanical properties of reconstituted collagen. |
AUG 72 |
|
| Authors:
An-Lac. Nguyen; G. L. Wilkes; PRINCETON UNIV N J
|
| The dynamic mechanical properties of collagen are considerably sensitive to moisture as expected. The frequency dependence of mechanical behavior is of importance in separating out apparent from real molecular loss mechanisms. The melting temperature of dry collagen is of the order of 217 C rather than 145 C. (P.S.-PL) ANNOTATION: The melting and dynamic mechanical properties of reconstituted collagen. |
|
| A Dynamic Helicopter Performance and Control Model. |
AUG 1972 |
|
| Authors:
G. J. Born; D. Carico; E. J. Durbin; PRINCETON UNIV N J
|
| Carico,D. ;Durbin,E. J. ;DA-28-043-AMC-02412(E)DA-1-H-162202-A-2191-H-162202-A-21907ECOM02412-11Report on the Princeton Pennsylvania Army Avionics Research Program.(*aerodynamics, mathematical models), (*helicopters, aerodynamics), descent, aircraft landings, flight paths, pilots, performance(human), aerodynamic characteristicscomputerized simulationThe report gives the results of the development of a dynamic helicopter performance and control model. The dynamic performance model is obtained by using the force and rotor aerodynamic equations. This performance model together with the moment balance and control equations are used as a ... |
|
| Thermomechanical and thermogravimetric analyses of systematic series of polymides. |
MAY 72 |
|
| Authors:
J. K. Gillham; K. D. Hallock; S. J. Stadnicki; PRINCETON UNIV N J
|
| Twelve polyimides which differ systematically in chemical structure were investigated through the temperature range - 190 to 500 C by torsional braid analysis. The degradative regions were also examined by TGA. Relationships between chemical structure/thermal history, processability, thermomechanical behavior and weight loss are discussed. A logical thermal program for converting the precursor polymeric acid solutions to solid polyimides was developed. High temperature, thermally induced chemical reactions could be regulated so ... |
|
| Thermosetting reactions: thermo- chemical reactions of triallyl cyanurate and triallyl isocyanurate. |
MAY 72 |
|
| Authors:
J. K. Gillham; C. C. Mentzer; PRINCETON UNIV N J
|
| Polymerization of triallyl cyanurate (TAC) AND TRIALLYL ISOCYANURATE (TAIC) was investigated. The first detailed quantitative use in the field of polymers of DuPont's Differential Scanning Calorimeter (DSC), and a parallel infrared study, investigated the influence of atmosphere and initiator on the thermal events. High conversions of the TAC and TAIC POLYMERIZATION REACTIONS ARE ATTRIBUTED TO EXTENSIVE FORMATION OF RINGS BY INTRAMOLECULAR REACTIONS. Higher conversions with TAC are attributed to the ... |
|
| Radiation Induced F-Region Plasma Phenomena. |
MAY 1972 |
|
| Authors:
Francis W. Perkins; Ernest J. Valeo; PRINCETON UNIV N J
|
| Collective plasma phenomena induced in the ionospheric F-region by intense high-frequency radiation are examined on several time and length scales. The short wavelength, high-frequency turbulence associated with the observed high-frequency enhanced electron density fluctuations at the electron plasma frequency is shown to result from parametric excitation of plasma and acoustic waves by the high-frequency radiation. The wave kinetic equation describing the non-linear evaluation of the turbulence is presented. The time ... |
|
| Thermosetting reactions: thermo- chemical reactions of triallyl cyanurate and triallyl isocyanurate. |
APR 72 |
|
| Authors:
J. K. Gillham; C. C. Mentzer; PRINCETON UNIV N J
|
| Radical-induced polymerization of triallyl cyanurate (TAC) and triallyl isocyanurate (TAIC) is investigated. The solid state isomerization in these systems is investigated using differential scanning calorimeter. Factors which affect the thermal events of allylic polymerization are investigated. TAC polymerizes to a greater extent than does TAIC for a given concentration of initiator. The conversions of both can be very high and so much of the polymerization must occur in the solid ... |
|
| Thermomechanical behavior of N2 of a systematic series of linear poly(carborane siloxane)s containing icosahedral (-CB10H10C-) cages. |
APR 72 |
|
| Authors:
M. B. Roller; J. K. Gillham; PRINCETON UNIV N J
|
| An extensive investigation of structure- property relations for a series of well defined polymers which form the backbone components of the most recently developed high temperature elastomers is summarized. Structure and transition data for polycarborane siloxane are presented. Thermomechanical spectra of the polymers were obtained in nitrogen by torsional braid analysis. The carborane polymers experienced a mode of stiffening at about 560 C. (P.S.- PL) ANNOTATION: Thermomechanical behavior of a ... |
|
| Thermomechanical and thermogravimetric analysis of systematic series of polyimides. |
APR 72 |
|
| Authors:
J. K. Gillham; K. D. Hallock; S. J. Stadnicki; PRINCETON UNIV N J
|
| Polyimides are prepared from prepolymer solutions of polyamic acid in dimethylacetamide by removing solvent and effecting a ring-closure reaction in situ. Effects of curing, high temperature, and chemical structure on polyamides are investigated. Thermomechanical spectra of polyamides are presented. (P.S.- PL) ANNOTATION: Thermomechanical and thermogravimetric analysis of systematic series of polyimides. |
|
| Thermomechanical properties of polymers by torsional braid analysis. |
APR 72 |
|
| Authors:
J. K. Gillham; PRINCETON UNIV N J
|
| Studies with the torsional pendulum would add quantitative data and an assessment of the effect of orientation to the studies of thermal and environmental influences which are so easily assessed by torsional braid analysis. A unique facility for investigating structure-property relationships using small quantities of polymer. The most important contribution of the type of approach that is represented by torsional braid analysis is the juxtapositioning of the chemistry, characterization, processing ... |
|
| Superstructure in polypeptide films. |
APR 72 |
|
| Authors:
G. L. Wilkes; PRINCETON UNIV N J
|
| The general superstructure of films of poly- gamma-benzyl-L- glutamate, poly-gamma-methyl- L-glutamate, poly-L-glutamic acid and polylysine is investigated by small angle light scattering techniques. In some instances, optical microscopy, scanning electron microscopy and x-ray diffraction methods were also utilized. (P.S.-PL) ANNOTATION: Superstructure in polypeptide films. |
|
| On nonlocal elasticity. |
MAR 72 |
|
| Authors:
A. C. Eringen; D. G. B. Edelen; PRINCETON UNIV N J
|
| A theory of nonlocal elasticity based on the global balance laws and the second law of thermodynamics is presented. Constitutive equations are obtained for the nonlinear theory, first through the use of a localized Clausius-Duhem inequality and second through a variational statement of Gibbsian global thermodynamics. (Author, modified-PL) ANNOTATION: Mathematical analysis of nonlocal elasticity. |
|
| The Princeton Pennsylvania Army Avionics Research Program. A Fundamental Study of Static Electric Phenomena (Applied to Helicopters). |
MAR 1972 |
77 pages |
| Authors:
G. J. Born; W. F. Burke; E. J. Durbin; PRINCETON UNIV N J
|
| TY, *ELECTRIC DISCHARGES), (*HELICOPTERS, ELECTROSTATIC FIELDS), AVIATION SAFETY, ELECTRIC FIELDS, ELECTRIC INSULATION, VOLTAGE, ELECTRICAL RESISTANCE, HELICOPTER HOISTS, GROUND(ELECTRICAL)In the report is given a summary of the charging and discharging processes of a helicopter in flight. Emphasis is placed upon obtaining approximations for estimating the magnitude of the problem for given environmental conditions. The problems of electrostatic charging and discharging of helicopters with regard to safety of personnel, cargo and radio ... |
|
| The Princeton Pennsylvania Army Avionics Research Program. |
MAR 1972 |
42 pages |
| Authors:
Dunstan Graham; PRINCETON UNIV N J
|
| Using the tools of feedback system analysis and simulation a study has been made of the limitations on helicopter approach and landing under conditions of low vilibility. It is shown that relatively steep approaches to low decision heights can be made on instruments. Successful loop topologies were identified and considerable improvement over the standard GCA approaches was shown to be possible with a scanning beam system especially if beam rate ... |
|
| Chemiluminescent Reactions of Atomic Fluorine. |
FEB 1972 |
|
| Authors:
G. Schatz; M. J. Kaufman; PRINCETON UNIV N J
|
| Visible or ultraviolet luminescence is observed in the reactions of atomic fluorine with a wide variety of organic and inorganic molecules. In most cases, the radiation is produced by reaction with fluorine atoms generated by electric discharge through either CF4 or F2-Ar mixtures, indicating that the luminescences are due neither to impurities nor to the very exothermic reactions of F2. An exception to this is the reaction with hydrocarbons, where ... |
|
| Nonlocal polar elastic continua. |
JAN 72 |
|
| Authors:
A. C. Eringen; PRINCETON UNIV N J
|
| A continuum theory of nonlocal polar bodies is developed. Both the micromorphic and the nonpolar continuum theories are incorporated. The balance laws and jump conditions are given. By use of nonlocal thermodynamics and invariance under rigid motions, constitutive equations are obtained for the nonlinear micromorphic elastic solids. The special case -nonpolar, nonlocal elastic solids -is presented. (Author-PL) ANNOTATION: Nonlocal polar elastic continua. |
|
| The Princeton Pennsylvania Army Avionics Research Program. Take Off of Heavily Loaded Helicopters. |
JAN 1972 |
|
| Authors:
G. J. Born; E. J. Durbin; F. H. Schmitz; PRINCETON UNIV N J
|
| ALSO AD-747 732.(*helicopters, takeoff), hovering, ground effect, mathematical models, flight paths, optimization, airspeed, accelerationcomputerized simulation, control theoryIn the report are given the results of the optimal control theory applied to the take-off of heavily loaded helicopters and the instrumentation requirements to enhance VTOL-STOL pilot flight control during the take-off maneuvers. The analysis and computation determined constrained and uncontrained extremal trajectories which maximize final altitude at a given distance (Research and ... |
|
| Molecular Beam Analysis Investigation of the Reaction Between Atomic Fluorine and Carbon Tetrachloride. |
JUL 1971 |
|
| Authors:
Charles E. Kolb; Myron J. Kaufman; PRINCETON UNIV N J
|
| Molecular beam analysis has been employed to characterize microwave discharges through flowing CF4 and F2 as sources of atomic fluorine. The use of an alumina tube in the discharge region and Teflon-coated Pyrex downstream minimizes surface reactions of the fluorine atoms. The CF4 discharge products contain very little F2. However, larger concentrations of fluorine atoms are produced by the F2 discharge. At room temperature the reaction of atomic fluorine with ... |
|
| Turbulence in Confined Plasmas at High Electric Fields, |
JUN 1971 |
|
| Authors:
R. Kulsrud; a. bers; B. Coppi; T. Dupree; F. Santini; PRINCETON UNIV N J
|
| Magnetically confined plasmas carrying a relatively large current in the direction of the main magnetic field are considered in regimes where the applied electric field is larger than the runaway critical field. The plasma is assumed to be turbulent with a relatively low fluctuation level induced by ion sound waves, Langmuir waves, and ion cyclotron waves. Three aspects of the problem are examined: (a) The transfer of momentum within the ... |
|
| Research on Mathematical Techniques in Psychology. |
JUN 1971 |
|
| Authors:
Harold Gulliksen; PRINCETON UNIV N J
|
| The research work under the project has focused on the development of mathematical techniques for studying psychological problems. These methods have been mainly related to three fields of psychology: (1) psychological scaling, (2) learning and concept formation, and (3) mental measurement. Psychological scaling procedures have been demonstrated to be useful in a great many areas, ranging from sensory discrimination of physical stimuli, such as colors, sounds, etc., through more complex ... |
|
| New minature injection molding system for test specimens. |
MAY 71 |
|
| Authors:
B. Maxwell; PRINCETON UNIV N J
|
| An injection molding system for the preparation of minature test specimens from less than one gram samples is described. It is desirable that such a machine incorporate the following features: AFTER THE INJECTION STEP IS COMPLETED ONLY A MINIMUM OF MATERIAL SHOULD BE LEFT IN THE MACHINE IN ORDER TO REDUCE SAMPLE WASTE; THE LENGTH OF TIME THE POLYMER MATERIAL IS SUBJECTED TO HIGH TEMPERATURES SHOULD BE KEPT TO A ... |
|
| Amorphous polyolefins: the relationship between molecular structure, molecular motion, and mechanical behavior. |
MAY 71 |
|
| Authors:
J. K. Gillham; J. R. Martin; PRINCETON UNIV N J
|
| Two series of amorphous polyolefins were obtained by cationic polymerization of alpha olefins. The polymerizations were carried out al low temperatures (-78 to -130 C) so that the hydride shift can occur before the propagation step and also so that other competing reactions are rendered noncompetitive. The steps involved in the polymerization of 3-methyl-1-butene are summarized for illustration. The thermomechanical spectra of these polyolefins were obtained by torsional braid analysis ... |
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Reports by Corporate Author
