A study of the intensity of the self-broadened fundamental band of hydrogen chloride
Intensity study of self-broadened fundamental band of hydrogen chloride
Burnett, S. C.↗
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Fundamentals of the oxidation protection of tantalum Final report
Fundamentals of oxidation protection of tantalum by silicides
Graff, R. A.↗
Intensity of the self-broadened fundamental band of hydrogen chloride
Hydrogen chloride self broadened fundamental vibration rotation band intensity variation with pressure investigated by absorption spectroscopy analysis
Burnett, S. C.↗
Fundamental techniques of weight estimating and forecasting for advanced manned spacecraft and space stations
Fundamental techniques of weight estimating and forecasting for advanced manned spacecraft and space stations
Heineman, W., Jr.↗
Investigations of critical configurations for fundamental range networks
Investigations of critical configurations for fundamental range networks
Blaha, G.↗
Minimum-mass design of a plate-like structure for specified fundamental frequency
Minimum mass design of two dimensional plate-like structure with free vibration fundamental frequency or aeroelastic constraints, using optimal theory for extremum
Armand, J.-L.↗
Fundamental Mechanisms of Tensile Fracture in Aluminum Sheet Unidirectionally Reinforced with Boron Filament
Results are presented from an experimental research effort to gain a more complete understanding of the physics of tensile fracture in unidirectionally reinforced B-Al composite sheet. By varying the degree of filament degradation resulting from fabrication, composite specimens were produced which failed in tension by the cumulative mode, the noncumulative mode, or by any desired combination of the two modes. Radiographic and acoustic emission techniques were combined to identify and physically describe a previously unrecognized fundamental fracture mechanism which was responsible for the noncumulative mode. The tensile strength of the composite was found to be severely limited by the noncumulative mechanism which involved the initiation and sustenance of a chain reaction of filament fractures at a relatively low stress level followed by ductile fracture of the matrix. The minimum average filament stress required for initiation of the fracture mechanism was shown to be approximately 170 ksi, and appeared to be independent of filament diameter, number of filament layers, and the identity of the matrix alloy.
Herring, H. W.↗
Experimental and theoretical studies on collision-broadened lines in the nu-4 fundamental of methane.
High-resolution experimental and theoretical studies performed earlier by us on the collision-broadened rotational lines in the nu-3 and 2nu-3 bands of methane have been repeated on the lines in the nu-4 fundamental of the molecule. Line-width measurements and computations, as well as line-shape measurements, indicate that the significant differences which exist between the rotational term values of the nu-3 and nu-4 vibrational levels have no observable effect on the collision-broadening mechanism. Using the predictions of line-widths, based on the Anderson-Tsao-Curnutte theory in the extended version of Tejwani for octopolar molecules, the theoretical dependence of line-widths on temperature has been calculated for CH4-CH4, CH4-H2 and CH4-He collisions.
Varanasi, P.↗
On the observability of the H3/+/ fundamental spectrum.
The calculations and conclusions of Kawaoka and Borkman (1971) concerning the dipole moment derivative of the H3(+) electronic ground state are discussed. The possibility of observing the H3(+) fundamental in hydrogen gas in local thermodynamic equilibrium is considered, and the H3(+) average absorption coefficient is compared with the total absorption coefficient for other mechanisms.
Patch, R. W.↗
Fundamental properties of semiconductor materials, and material performance in detectors
Procedures for determining fundamental properties of semiconductor materials, their performance as radiation detectors, and their service life as such detectors are given. Relationships were established between the minority carrier lifetime in the bulk of the material and the charge collection efficiency of the detector.
Casper, K. J.↗
Relation of the diffuse reflectance remission function to the fundamental optical parameters.
The Kubelka-Munk equations describing the diffuse reflectance of a powdered sample were compared to equations obtained using a uniformly-sized rough-surfaced spherical particle model. The comparison resulted in equations relating the remission function and the Kubelka-Munk constants to the index of refraction, the absorption coefficient, and the average particle diameter of a powdered sample. Published experimental results were used to test the equation relating to the remission function to the fundamental optical parameters.
Simmons, E. L.↗
Planets and satellites: A survey of fundamental facts
An account of the fundamental properties of the planets of the solar system and of their satellites including their masses, dimensions and distances is presented. The observational uncertainty in present knowledge of planetary masses and dimensions (or mean densities) is discussed critically. The fact is pointed out that the initial scale of the solar system may have differed appreciably from the present one. Observed phenomena which can furnish empirical information on the internal structure of the planetary globes will also be reviewed.
Kopal, Z.↗
Fundamental bands of S(32)O2(16)
The infrared-active vibration-rotation fundamentals of sulfur dioxide were measured with moderately high spectral resolution. Quantum number assignments were made for spectral lines from J = O to 57, by comparison with theoretically computed spectra which include the effects of centrifugal distortion. The following values for the band centers were determined: nu sub 1 = 1151.65 + or - 0.10/cm, nu sub 2 = 517.75 + or - 0.10/cm, and nu sub 3 = 1362.00 + or - 0.10/cm. Intensities of the observed lines have also been computed. Dipole moment derivatives were obtained.
Fox, K.↗
Measurement of multiplet intensities and noble gas-broadened line widths in the nu 3 fundamental of methane
Presented integrated intensity data at 300 K for J multiplets between P(11) and R(11) in the nu-3 fundamental of C-12 methane are shown to be in good agreement with most previously published pertinent values. Also, line widths measured at 100 K, 130 K, 190 K, 250 K, and 300 K for R(0), R(1), and R(2) broadened by He, Ne, and Ar are presented, and the line-width temperature dependence is discussed for the three cases of broadening.
Varanasi, P.↗
The nu sub 9 fundamental of ethane - Integrated intensity and band absorption measurements with application to the atmospheres of the major planets
Measurements of the absolute intensity and integrated band absorption have been performed for the nu sub 9 fundamental band of ethane. The intensity is found to be about 34 per sq cm per atm at STP, and this is significantly higher than previous estimates. It is shown that a Gaussian profile provides an empirical representation of the apparent spectral absorption coefficient. Employing this empirical profile, a simple expression is derived for the integrated band absorption, which is in excellent agreement with experimental values. The band model is then employed to investigate the possible role of ethane as a source of thermal infrared opacity within the atmospheres of Jupiter and Saturn, and to interpret qualitatively observed brightness temperatures for Saturn.
Varanasi, P.↗
Application of wave mechanics theory to fluid dynamics problems: Fundamentals
The application of the basic formalistic elements of wave mechanics theory is discussed. The theory is used to describe the physical phenomena on the microscopic level, the fluid dynamics of gases and liquids, and the analysis of physical phenomena on the macroscopic (visually observable) level. The practical advantages of relating the two fields of wave mechanics and fluid mechanics through the use of the Schroedinger equation constitute the approach to this relationship. Some of the subjects include: (1) fundamental aspects of wave mechanics theory, (2) laminarity of flow, (3) velocity potential, (4) disturbances in fluids, (5) introductory elements of the bifurcation theory, and (6) physiological aspects in fluid dynamics.
Krzywoblocki, M. Z. V.↗
Observations of the fundamental rotation-vibration band of CN
Three lines of the fundamental rotation-vibration band of CN have been observed in the laboratory using a King furnace. The transition moment squared has been found to be .00075 plus or minus .00031 atomic units. In addition, the transition moment squared of the 0-0 band of the red system of CN has been measured to be 0.48 plus or minus 0.28 atomic units (an oscillator-strength of .00033 plus or minus .0019).
Treffers, R. R.↗
Fundamentals of fluid sealing
Textbook covers fundamentals of fluid sealing. Included are seal performance parameters and seal operating regimes.
Zuk, J.↗