In-flight direct-strike lightning research

Tests designed to investigate the lightning-generated electromagnetic environment affecting aircraft are discussed. An F-106B aircraft specially instrumented for lightning electromagnetic measurements was used. The instrumentation system is reviewed and typical results recorded by the instrumentation during simulated-lightning ground tests performed for a safety survey are presented. Several examples of data obtained during summer flight testing are presented and future plans are discussed

The 1981 direct strike lightning data

Data waveforms obtained during the 1981 direct strike lightning tests, utilizing the NASA F-106B aircraft specially instrumented for lightning electromagnetic measurements are presented. The aircraft was operated in a thunderstorm environment to elicit strikes. Electromagnetic field data were recorded for both attached lightning and free field excitation of the aircraft

The Effective Potential in Kohn-Sham Theory

Density functional theory (DFT)} is a widely used technique for electronic structure calculations. It allows a first principles solution of the many-electron Schrödinger equation by relating the electron density of the systems ground state to that of a fictitious non-interacting system. The success of DFT methods comes from the use of approximations to the exact total energy functional that, with an appropriate functional, accurately determine the ground state properties of a system. The work presented in this thesis uses properties of the Kohn-Sham effective potential to correct errors in DFT approximations, particularly those associated with self-interactions. Applying a constraint to the effective potential enforcing the correct, self-interaction free asymptotic behaviour significantly improves the calculation of ionisation energies for the LDA, PBE, and B3LYP functionals. For LDA this error is reduced from 4.08 eV to 1.61 eV, with a similar reduction in error found for PBE and B3LYP. Additional methods to improve this self-interaction correction are presented and expanded upon, including a self-interaction free hybrid scheme for the constrained minimisation method. This hybrid further improves ionisation energies over the constrained method. Average errors of PBE ionisation energies are reduced from 4.41 eV to 0.34 eV. These improvements are also found to extend to the ionisation energies of all occupied orbitals and electron affinities. A post-scf correction that corrects ionisation energies from the Kohn-Sham eigenvalue to those from a $\Delta_{\text{scf}}$ calculation is also developed. Ionisation energies for the LDA approximation are improved from an average error of 3.99 eV to 0.93 eV, with similar improvements seen for lower lying ionisation energies and electron affinities. The final work of this thesis shows that, unlike conventional band theory, spin-DFT (SDFT) can predict insulating behaviours in periodic systems from a unit cell containing an odd number of electrons. Additionally, this result is shown for a novel method for implementing DFT; combining SDFT XC energy functionals with a spin-independent effective potential, through the use of the optimised effective potential method

Letter from Thomas Pitts to James B. Finley

Dr. Thomas Pitts writes from New York City asking Finley to receive two land warrants (6295, 6421) from Alexander Homes, Esq., in Newark, Ohio. Pitts requests that Finley sell the land to advantage and send the net proceeds to him. He then asks Finley to call on Rev. Spencer in Cincinnati to let him know that he will send necessary proof on account of two notes paid the Newark Banking Co. for the estate of Jonathan Dayton (deceased). In a postcript, Pitts advises that these military land warrants sell for $200. Abstract Number - 8https://digitalcommons.owu.edu/finley-letters/1007/thumbnail.jp

#BlackWorkersMatter

Asserting that Black lives matter also means that the quality of those lives matters, and economic opportunity is inextricably linked to quality of life. Decades after the Civil Rights Movement and the passage of Title VII of the Civil Rights Act of 1964, structural barriers still hold back African Americans in the workplace.The authors of this report provide some broader context on the black jobs crisis, including its origins and effects; the particular impact of the crisis on African American women; the declining state of black workers and their organizations, particularly within the labor movement; and the implications of the twin crises of joblessness and poverty-level wages for organizing. This report also features examples of how black worker organizations are combining strategic research, services, policy advocacy, and organizing to help black workers weather the economic storms and improve the quality of jobs that are open to African Americans over the long term