Theory of atomic additivity in molecular hyperpolizabilities

Hyperpolarizability is a function of frequency. This is called dispersion. Because of the Kramers-Kronig relations, researchers expect that a material that is dispersing light is also absorbing it. Where there is both dispersion and absorption, the molecular polarizabilities are complex functions of the frequency. This led researchers to consider atomic additivity in both the real and imaginary parts of the ordinary and hyperpolarizabilities. This effort is desirable not only from a theoretical point of view, but also because of the existence of a large body of complex refractive index data, which may be used to test the additivity principle with the complex valued ordinary dipole polarizability

Kinetics of diffusional droplet growth in a liquid/liquid two-phase system

In the case of the diaphragm cell transport equation where the interdiffusion coefficient is a function of concentration, we have derived an integral of the form, t = B(sub 0) + B(sub L)ln(delta(c)) + B(sub 1)(delta(c)) + B(sub 2)(delta(c))(exp 2) +... where t is the time and (delta(c)) is the concentration difference across the frit. The coefficient, B(sub 0), is a constant of integration, while the coefficient, B(sub L), B(sub 1), B(sub 2), ..., depend in general upon the cell constant, the compartment volumes, the interdiffusion coefficient, and various of its concentration derivatives evaluated at the mean concentration for the cell. Explicit formulae for B(sub L), B(sub 1), B(sub 2), ... are given

Mass transport by diffusion

For the purpose of determining diffusion coefficients as required for electrodeposition studies and other applications, a diaphragm cell and an isothermal water bath were constructed. the calibration of the system is discussed. On the basis of three calibration runs on the diaphram cell, researchers concluded that the cell constant beta equals 0.12 cm -2 . Other calibration runs in progress should permit the cell constant to be determined with an accuracy of one percent

Kinetics of diffusional droplet growth in a liquid/liquid two-phase system

This report contains experimental results for the interdiffusion coefficient of the system, succinonitrile plus water, at a number of compositions and temperatures in the single phase region of the phase diagram. The concentration and temperature dependence of the measured diffusion coefficient has been analyzed in terms of Landau - Ginzburg theory, which assumes that the Gibb free energy is an analytic function of its variables, and can be expanded in a Taylor series about any point in the phase diagram. At most points in the single phase region this is adequate. Near the consolute point (critical point of solution), however, the free energy is non-analytic, and the Landau - Ginzburg theory fails. The solution to this problem dictates that the Landau - Ginzburg form of the free energy be replaced by Widom scaling functions with irrational values for the scaling exponents. As our measurements of the diffusion coefficient near the critical point reflect this non-analytic character, we are preparing for publication in a refereed journal a separate analysis of some of the data contained herein as well as some additional measurements we have just completed. When published, reprints of this article will be furnished to NASA

The Dome and the Rock

Originally published in 1968. In The Dome and the Rock: Structure in the Poetry of Wallace Stevens, James Baird traces the process of Wallace Steven's Grand Poem and the total structure that it accomplished in language. In the words of Professor Baird, "The full art of Stevens is organized with architectural precision. The shape of the mind becomes a building, the framework of which is founded in a willed symmetry of design." In The Dome and the Rock, James Baird exposes the capacity of Wallace Stevens to design his poetry in a manner similar to an architect, and he "reveals the craftsmanship of [Wallace's] acts as builder.

Direct Diode Pumped Raman Amplifier Based on a Multimode Graded Index Fiberr

The direct pumping of a Raman fiber amplifier (RFA) was attempted using an array of four 25W, fiber pigtailed diodes at 936nm, combined via a 7 channel fiber beam combiner. The initial attempt was conducted using a 1.8 km, 100 micron core, GRIN fiber with an NA of .29 and attenuation 3.6 dB/km at 936nm. While amplification was not achieved, over 200mW of conversion was shown, with 10.4W of pump power and 3.5W of seed. This corresponds to an average conversion efficiency of 2.2%. The subsequent effort utilized a 2km long, 200 micron core, GRIN fiber, with NA of .27 and attenuation of 2.8dB/km at pump wavelength. Again, amplification was not achieved, but a gain of 80mW was present, with 3.5W of seed power and 14W of pump. This corresponds to an average conversion efficiency of 0.6% and only 2.5% of the coupled seed power. The final experiment attempted to solve the problem of coupling efficiency and high Raman threshold by utilizing a 50/250 dual-clad fiber, with NAs of .28 and .46 for the core and inner cladding, respectively. Again, amplification was not realized, as only 100mW of gain was present, with 25W of pump and 4.2W of coupled seed power, corresponding to 36% of the coupled seed, and an average conversion efficiency of only 0.4%. Although amplification was not achieved for any of the three fibers, gain was shown possible in all, showing that directly pumping an RFA with a diode source is possible

The hydraulic characteristics of channels with overbank flood plain flow

Summary available: p. i

Identity Work for Boomer Professionals: Career Transition in the Restructured Economy

I conducted a qualitative study, interviewing thirty-three workers from the baby-boomer generation, with an objective of examining the intersection of aging and economic restructuring for boomer professionals. Participants’ careers had been impacted by the restructured economy at a point after they reached the age of forty. I applied an identity theory framework that emphasized meanings associated with growing older in the workforce, changes in the economy, self-meanings, and behavior in the restructured workplace. My focus also included process and questions of structure and agency. I used grounded theory methods to provide theory that explains the experience of transitioning from an existing work role as a downsized worker seeking a new job, entering selfemployment, or pursuing a reinvention of one’s career. I examine the transition process, the effects of structure, the formation and maintenance of identity in the transition role, and the factors that impact transition outcomes. I propose a theoretical argument that provides a comprehensive framework for the transition process. I establish transition as a relatively new and legitimate role for today’s worker, identify hegemonic structure as being particularly influential in the development of transition role identities, conceptualize personal resources—specifically self-esteem, selfefficacy, and authenticity—as key aspects of maintaining identity during transition, and investigate worker attributes that relate to transition outcomes. I assess career outcomes in terms of how successfully the transition role is negotiated and identify characteristics that comprise successful and unsuccessful transitions. I then discuss the implications of unabated economic restructuring for boomer professionals and, more broadly, for the future of the U.S. economy