Physics

Very few absolute oscillator strengths (f-values) are known for lines in complex spectra; little confidence can be placed in most of the results which have been reported. In an effort to remedy this situation an atomic beam apparatus was constructed and used for the experimental determination of the absolute f-values of resonance lines in the Fe I, CR I, Mn I, and Cu I spectra.The theory of the formation of absorption lines when light from a source of continuous radiation passes through an atomi...

Mathematics

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.Functions v(x,t) satisfying certain partial differential equations of the form v[subscript t]=F(x,t,v,v[subscript x],v[subscript xx] in the region R: 0 < x < 1, 0 < t [<=] T are studied. The principal results of Part I determine circumstances in which it can be asserted that v and v[subscript x] admit, in R, bounds which depend only on the bounds for the f...

Chemistry

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Chemistry

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.3-Phenylpropylamine[...] reacts with nitrous acid in aqueous solution to give hydrocinnamyl alcohol, benzylmethylcarbinol and allylbenzene in the ratio 2.5:1.6:1.0. Under similar conditions, [...] gives[...]-methoxyhydrocinnamyl alcohol,[...] in the ratio 2.1:1.4:1.0. No evidence was found for the presence of other isomeric alcohols or olefins.A sample of each product from 3-phenylpr...

Biology

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.The behavior of "Catcheside s ring," an unstable closed-X chromosome [...] of Drosophila melanogaster, has been analyzed with the purpose of identifying the factors controlling the variable-level of [...] instability and of determining the mechanism of [...] elimination. The Y chromosome and the structure of the homologous rod-X chromosome were shown to have no influence on...

Chemistry

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.The crystal structure of dimethyl phosphino-borine trimer, [(CH[subscript 3][subscript 2]PBH[subscript 2][subscript 3], has been determined by analysis of its x-ray diffraction maxima. Use was made of a three-dimensional Patterson function, least squares on the structure factors, and a three-dimensional electron-density difference map. The space group is P[subscript nma]; the unit ce...

Chemical Engineering

Part I: The volumetric behavior of nitrogen dioxide was determined experimentally at temperatures between 100 and 340

Chemistry

The development of a new Lewis acid catalyzed sigmatropic reaction is described. This process, termed the allenoate-Claisen rearrangement, involves the metal-catalyzed condensation of an allenic ester with a tertiary allylic amine. The zwitterionic intermediate resulting from this condensation undergoes facile [3,3] bond reorganization to provide b-amino-a,b,e,z-unsaturated-g,d-disubstituted ester products. The allenoate-Claisen reaction has been demonstrated to allow for the production of a div...

Chemistry

Magnetic Resonance Imaging (MRI) has become a powerful tool for noninvasive imaging of living specimens. Magnetic resonance contrast agents containing the paramagnetic ion gadolinium(III) are used to enhance regions, tissues, and cells that are magnetically similar but histologically distinct. To increase the effectiveness of contrast agents, agents responsive to biological phenomena and directed to specific regions need to be developed. These two improvements are related in that many biological...

Physics

I. Plasma Oscillations and Radio Noise from the Disturbed Sun.Many investigators have suggested that plasma oscillations in the solar corona may be the source of large bursts of radio noise in the meter wavelength region. Two aspects of this problem are considered in this report: (a) the excitation of plasma oscillations by directed beams of charged particles, and (b) the conversion of energy in the longitudinal plasma oscillations to transverse electromagnetic waves by means of random inhomogen...

Engineering and Applied Science

Results are presented of an experimental investigation of impact-pressure and total-temperature interpretation at a nominal Mach number of 5.6. The data indicate that the Rayleigh equation, which assumes non-viscous flow, requires correction at low free-stream Reynolds numbers. These viscous effects are detected at Reynolds numbers (based on impact-probe diameter) as high as 6000, and they continue to increase with decreasing Reynolds numbers. At the low pressure limit of the facilities used in ...

Biology

This thesis is organized around the theme of modulation of transcriptional states in Arabidopsis thaliana. The two particular mechanisms on which this work focuses are (1) microRNA-mediated negative regulation of protein levels (either by mRNA cleavage or by repression of translation) and (2) transduction of extracellular signals into the cell to affect the transcription program.Chapter 2 characterizes the role of the EARLY EXTRA PETALS (EEP1) microRNA in the regulation of organ formation in the...

Mechanical Engineering

Two problems are considered in this thesis: the modeling of heat and mass diffusion effects on the dynamics of spherical bubbles, and the computation of unsteady, bubbly cavitating flows in nozzles. The goal of Part I is to develop a reduced-order model that is able to accurately and efficiently capture the effect of heat and mass transfer on the dynamics of bubbles. Detailed computations of forced and oscillating bubbles including heat and mass diffusion show that the assumptions of polytropic ...

Biology

Protein degradation is one of the tactics employed by the cell for irreversibly inactivating proteins. In eukaryotes, ATP-dependent protein degradation in the cytoplasm and nucleus is carried out by the 26S proteasome. Most proteins are targeted to the 26S proteasome by covalent attachment of a multiubiquitin chain. A key component of the enzyme cascade that results in attachment of the multiubiquitin chain to the target or labile protein is the ubiquitin ligase that controls the specificity of ...

Aeronautics

A problem of current practical interest to the field of Aeronautics is whether cement coatings associated with strain gages and fatigue warning indicators have appreciable effect upon fatigue characteristics.Fatigue tests in rotary bending were conducted at room temperature, 200[degrees]F and 400[degrees]F on plain specimens of 2014-T and 7075-T and specimens coated with a synthetic resin lacquer, a synthetic resin cement, and an epoxy resin cement.The effect of these coatings was slight at room...

Physics

Measurements were made on the 5-meter Paschen-Runge spectrograph with a photoelectric photometer. Special carriages were designed to keep the photocells focused and properly aligned with the grating while the spectrum is scanned. The circuit of the photometer is of an AC ratio type, and the ratios of the intensities of the scanned iron arc lines are recorded automatically by a Brown Recorder.The temperature and self-absorption present in different parts of the arc, and in the arc under different...

Aeronautics

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstraact is included in .pdf document.Results of an experimental investigation of pressure gradients due to axial temperature gradients in small diameter tubes are presented. The tests, which covered the region of Knudsen numbers (based on tube inside radius) of 0.01 to 6, indicate good correlation with theory.It is of value to note that this correlation was obtained by using [Delta]T equal to the temperature difference...

Mathematics

This thesis is concerned with functions and group homomorphisms. The tool system employed is the dicategory, an algebra of mappings with operation that of composition and in which decomposition into composites of mappings onto, isomorphisms into, identities into, and so on, is possible. The dicategory axioms are abstractions of certain properties common to functions, group and ring homomorphisms, continuous functions between topological spaces, and so on. The problems solved are those of faithfu...

Geological and Planetary Sciences

The pyrometasomatic deposits at Iron Mountain, near the northern end of the Sierra Cuchillo in Sierra and Socorro Counties, New Mexico, have been formed through replacement of calcareous beds of Paleozoic age, generally at or near contacts with intrusive masses of rhyolite, rhyolite porphyry, aplite, and fine-grained granite. The metamorphism is probably mid-Tertiary in age. Its two chief products are (a) light-colored, dense, fine-grained granulites rich in diopside, clinozoisite, bytownite, an...

Geological and Planetary Sciences

First Part.Cylindrical specimens of Southern California granodiorite and gabbro were creep-tested at constant torques in a high-magnification torsion apparatus. Complete creep and creep recovery curves at room temperature were recorded for periods of about 10,000 minutes.The results are represented by an empirical equation of the form: s = p (a+b log t) where s is the strain, p the stress and t the time. No evidence was found of creep behavior suggestive of the Michelson equation.For some granod...

Chemical Engineering

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.I. The eddy diffusivity and the eddy viscosity near the center of a pipe have been determined for the case of turbulent, cylindrically symmetric, steady, non-uniform flow*. The eddy properties were calculated from measurements of composition and velocity in a test section 36 in. long and 6 in. in diameter. Natural gas was introduced into a turbulent air stream through an annulus sect...

Astronomy

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.Observations have been made of the spectrum of the solar chromosphere outside of eclipse. The spectral region covered extends from [...] to [...] and from [...] to [...]. In addition, The O I triplet at [...] was photographed. In all, 1882 emission lines were photographed, and measured for wavelengths. Photographic intensity profiles were found for 530 of the lines, through the use o...

Electrical Engineering

Low-frequency ionospheric polarization, relative virtual height, and relative reflection coefficient measurements were made at near vertical incidence during October 1952. These measurements were made at a frequency of 50 kc/s.A new, continuous-wave, phase-measuring technique was employed. The essential features of the system are (1) a horizontal transmitting antenna near the surface of the ground which is resonant at the operating frequency and which radiates no ground wave in the direction of ...

Chemistry

IMethods have been developed for the preparation and purification of iodinated haptens of the arsanilic acid series suitable for critical experiments on hapten binding in immune aggregates. Additional data are given on the preparation and properties of the solid immune adsorbents described by Lerman.The inclusion of homologous monohaptenic substances in the aggregates formed between these solid adsorbents and homologous antibody has been studied under a variety of experimental conditions. The ex...

Chemistry

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.The kinetics of the alpha-chymotrypsin catalyzed hydrolysis of N-carboethoxy-L-tyrosinamide have been determined in aqueous solution at 25[degrees]C and at both pH 7.9 and pH 8.2. The enzyme-inhibitor dissociation constants of N-carboethoxy-D-tyrosinamide, N-carboethoxy-D-tyrosinmethylamide, and N-carboethoxy-L-tyrosinmethylemide have been evaluated in aqueous solution at 25[degrees]...

Aeronautics

The analogue of the variational principle was applied on the path integral to obtain the self-energy of the scalar nucleon interacting with the neutral scalar meson (with vanishing mass) field for variable coupling constant g[superscript 2]. To obtain the lowest energy of the nucleon from the asymptotic form of its kernel it is essential to replace it (t:time) by another variable [tau], say. Therefore it was first shown that the equation for a scalar nucleon in a given external field has the for...

Engineering and Applied Science

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.This thesis presents the results of an experimental study to determine whether atomic mass has an appreciable influence on certain physical properties of metals. Iron was chosen for this investigation, several specimens of natural iron of high purity and two specimens of iron enriched in the isotopes Fe54 and Fe57 being available.Measurements of the temperature coefficients of electr...

Aeronautics

The thermal theory of laminar flame propagation for hydrogen-bromine mixtures is described. The method of analysis follows the earlier work of von Karmen and Millan and of von Karmen and Penner. The problem is materially simplified by introducing the steady-state approximation of classical chemical kinetics for the concentrations of H- and Br-atoms.The general formulation of the problem is presented in Section II.Approximate solutions of the relevant mathematical problems, utilizing various proc...

Chemical Engineering

PART ONEAn equation of state has been developed which is a series expansion in orthogonal polynomials. The evaluation of coefficients by least squares methods is significantly simpler than for the case of a power series expansion. The values of the expansion coefficients are independent of the point of truncation of the series. Additional terms may be added to the equation without necessitating recomputation of existing coefficients. The Tchebichef and Gram polynomials were used.The equation of ...

Chemical Engineering

I.Measurements of the rate of evaporation of drops of varying shapes are required in order to determine the influence of such a variable on this important industrial transport process. Few data, if any, are available concerning the evaporation of drops of hydrocarbons.Measurements were made of the evaporation of drops of n-heptane at air velocities from 2 to 8 feet per second, corresponding to Reynolds numbers as high as 200. The transport rate was established for drops under approximately 30 di...

Chemistry

PART I. The Mechanism of Aminations of Halobenzenes.An elimination-addition mechanism, probably involving a "benzyne" intermediate, was established for the rearrangements which often occur in the conversion of non-activated aryl halides to arylamines with metallic amides. The evidence for the "benzyne" intermediate was obtained through 14C-tracer studies of rearrangements with iodobenzene, experiments designed to determine the role of the hydrogen atom located ortho to the di...

Chemistry

Allylcarbinyl tosylate was found to solvolyze in 98% formic acid 3.7 times faster than n-butyl tosylate. Changes in the rate ratio with nucleophilicity of the solvent suggest different mechanisms for these solvolyses. The formolysis products of allylcarbinyl tosylate, when corrected for secondary rearrangements, were found to be virtually identical with those from cyclobutyl tosylate. Deuterium-labeling experiments indicated complete scrambling of the methylene groups in the ring-closed products...

Chemical Engineering

Ion-surface interactions are important in a variety of fields such as plasma physics, surface analysis, and semiconductor manufacturing. However, the low-energy regime (50 eV - 1 keV) has been generally avoided by the research community because of the experimental challenges associated with providing sufficient ion beam current at low impact energy to conduct surface scattering studies. This energy regime is a useful range to study because threshold physical and chemical processes occur at low e...

Aeronautics

The plane-strain problem of the diffraction of a transient plane dilatation wave by a circular cavity in an elastic medium is treated. The method used determines the (total) solution only in the shadow zone, i.e., those points which cannot be connected to the source of disturbance by straight-line rays. Numerical results are obtained for the velocities and displacements on the "back" surface of the cavity caused by a step-stress incident wave.The analysis is based on a method devised b...

Biology

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.The X-IV translocation, [...], is shown to contain the wild-type allele, [...], at the white locus. This [...] has been replaced with a mutant gene, w, and a comparison of R([...])/w with R(w)/w[...] shows the former to give a variegated white phenotype while the latter is completely wild-type. It is concluded that the white variegation is due to an instability in the action of [...]...

Chemistry

Part IThe solvolysis mechanism of [Beta]-ferrocenylalkyl tosylates is discussed. Evidence is presented which shows that solvolysis occurs with preferential participation of the interannular electrons of the ferrocene moiety leading to intermediate formation of very stable carbonium ions. The products resulting from these solvolysis reactions demonstrate that these carbonium ions exhibit features expected for both ferrocenyl ring-bridged and iron-stabilized intermediates. The stereochemistry of s...

Engineering and Applied Science

In Part I the flow of an incompressible fluid inside a precessing spherical cavity is studied. The precession angle is assumed small and the equations of motion are linearized. For the case of large viscosity an expansion is developed in inverse powers of the viscosity by expanding the velocity field in vector spherical harmonics. The flow obtained is essentially rigid body motion. The case of low viscosity is also studied. At low precession rates difficulties arise in the boundary layer treatme...

Electrical Engineering

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.Any rational algebraic function of a complex variable, and certain irrational functions, can be factored in either of the equivalent forms: [...] or [...]. In these expressions, F is a function of the complex variable z; each m represents a positive or negative constant, and the other letters represent complex constants. A theory is developed for computers for such functions, in whic...

Chemical Engineering

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.Part IA study of the air oxidation of parts-per-million (p.p.m.) concentrations of nitric oxide was carried out in a constant-volume, batch reactor. The initial concentration of nitric oxide was varied from 2 to 75 p.p.m. while the oxygen concentration ranged from 3 x 10[^4] to 25 x 10[^4] p.p.m. The rate of the reaction was measured in the ambient temperature region from 17 to 37[de...

Chemistry

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.The initial velocities of [alpha]-chymotrypsin-catalyzed hydrolyses of acylated amino acid esters follow the rate law [...] when the only variables are initial substrate and enzyme concentration. In the above equation, [...] is the initial velocity, [...] and [...] are initial enzyme and substrate concentration, respectively, and [...] and [...] are a pair of experimentally determine...

Chemistry

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.IA two-dimensional trial structure has been determined for oxamide by means of a Patterson projection. The analysis, which was the reinvestigation of a previous preliminary survey that had reported a slightly wavy planar structure with a 1.65 [Angstrom] C-C bond, was interrupted by the publication of an apparently satisfactory structure by Romers. The present study and two recent pub...

Mechanical Engineering

A theoretical investigation is conducted to determine the effects of currents flowing through a boundary into the magnetohydrodynamic flow of an inviscid, incompressible fluid with anisotropic conductivity. The particular arrangement of an externally applied magnetic field parallel to the velocity field is investigated for two flow geometries; (i) semi-infinite flow over a conducting flat wall, and (ii) channel flow between a conducting lower wall and an insulating upper wall. In both cases the ...

Chemistry

NOTE: Tect or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.PART IIn the Heisenberg model, the hamiltonian describing a linear array of tightly-bound electrons that are exchangecoupled to their neighbors is [...], where [...] is the alternation parameter, [...] is the electron spin on the jth site, and J > 0 (antiferromagnetic coupling). The solutions of the one-dimensional antiferromagnet are studied by transforming to pseudo-spin ope...

Aeronautics

This experiment was conducted to investigate the reversed-bending fatigue notch sensitivity of 2014-T and 7075-T at elevated temperatures. Tests were conducted on three configurations of specimens which had external circumferential notches, and on one configuration of un-notched specimens.It was determined that the experimental stress concentration factor for both alloys, at room and elevated temperatures, increases with decreasing notch radius.At room and elevated temperatures, the fatigue notc...

Physics

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.A measurement at [...] and 95,000 feet was made of the heavy primary cosmic-ray charge spectrum [...] by means of a pulse ionization chamber. The characteristics of the chamber and associated electronics are described.The effect of nuclear stars on the counting rate of the chamber was determined experimentally by sending up simultaneously two chambers, one filled with argon at half t...

Chemistry

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.Acidified aqueous solutions containing [...], [...], and [...] have been irradiated by a high intensity flash lamp and the resulting change in the optical density of the solution has been observed spectrophotometrically as a function of time after the flash.Immediately following the flash, there is an increase in the optical density of the solution. This is attributed to the photoche...

Aeronautics

A torsional fatigue testing machine of the resonant vibrator type has been designed in order to investigate the fatigue and internal friction properties of 3S-O aluminum. This machine uses an elastic restraint on an a-c motor to create resonant conditions and uses a photocell electronic system for the measurement of internal friction by the method of measuring the logarithmic decrement of free oscillations.It has been established that for 3S-O aluminum at torsion stress levels below 112 psi, the...

Physics

The following thesis comprises calculations and discussion pertaining to the hypothesis of a spinning electron, chiefly for hydrogen-like atoms.Part I is a historical introduction.Part II contains results obtained in the spring of 1926, and presented to the Oakland meeting of the American Physical Society in the following June. The calculations are based on classical mechanics, the final results being obtained by an artificial modification. These results are discussed and shown to completely rep...

Chemical Engineering

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.Stress relaxation measurements were made in uniaxial tension under superposed hydrostatic pressures up to 5 kbar at temperatures ranging from -25 to 50[degrees]C. Two lightly filled (Hypalon-40 and Viton-B) and one highly filled elastomer (Neoprene) were studied because their pressure transition lie within the range of the apparatus. The construction and operation of the apparatus ar...

Astronomy

NOTE: Text or symbols not renderable in Plain ACII are indicated by [...]. Abstract is included in .pdf document.High-dispersion spectra of HD 37058, HD 37129 and HD 135485, three B stars exhibiting spectral peculiarities, have been studied on the basis of model atmospheres, with a view to detecting abundance anomalies. An approximate theory of high-temperature model atmospheres, applicable to stars in the range of spectral type B 1 - B7 and luminosity classes IV and V, has been developed and ap...