Understanding the Physical World

Lecture delivered in Hamman Hall on February 21, 1962, as the first of the Alumni Association's Distinguished Scholar Progra

Harry Carothers Wiess

Address given October 23, 1958, before the Master, Associates, and Members of Wiess College, the Rice Institut

Taking Off: The Politics and Culture of American Aviation, 1920-1939

Historians have traditionally emphasized the sharp differences between Herbert Hoover’s vision of an associational state and the activism of Franklin D. Roosevelt’s New Deal. This dissertation highlights an important area of continuity between the economic policies espoused by Hoover—during his tenures as Secretary of Commerce and President—and Roosevelt, focusing on federal efforts to promote the nascent aviation industry from the end of World War I until the passage of the Civil Aeronautics Act in 1938. These efforts were successful, and offer a unique arena in which to document the concrete gains wrought by Hoover’s associationalist ideology and Roosevelt’s New Deal. Moreover, both Hoover’s corporatist policies and New Deal efforts to create aviation infrastructure—largely through the auspices of public works agencies like the Public Works Administration and Works Progress Administration—form a striking example of the government’s ability to successfully foster the development of a new industry, even in the midst of the Great Depression. Significantly, both men’s efforts represented an alternative to nationalization, the path taken by virtually every European nation during the era. This period thus offers the opportunity to examine how both presidents’ aviation policies cohere with their larger visions of government’s proper relationship to the economy, to compare and contrast associationalism and New Deal, and to elucidate aviation’s role in promoting American economic development. During these years government actions expanded from having literally no engagement with commercial aviation to subsidizing airmail routes, creating a regulatory infrastructure to promote safe operations by licensing pilots, inspecting aircraft, approving manufacturing operations, and aggressively promoting flying to the American people. Contextualized by the American public’s well-documented enthusiasm for flying—particularly after Charles Lindbergh’s famous New York-to-Paris flight in 1927—these federal actions created America’s modern air transport network, culminating in the passage of the seminal Civil Aeronautics Act of 1938, the construction and improvement of almost a thousand airports around the country, and the growth of a core group of airlines, including United, Delta, and American, that still dominate commercial flying today

Impacts of government risk management policies on hedging in futures and options:LPM2 hedge model vs. EU hedge model

The main objective of this study is to compare the impacts of government payments and crop insurance policies on the use of futures and options measured from a downside risk hedge model with the impacts analyzed by the expected utility (EU) hedge model. Understanding the effects of government-provided risk management tools on the private market risk management tools, such as futures and options, provides value to both crop farmers and policy makers. Comparison of the impacts from the two hedge models shows that crop farmer will hedge less in futures under the LPM2 model than under the EU hedge model. This finding indicates that model misspecification is another reason for the phenomenon that farmers actually hedge less in futures than predicted by the EU model. From the perspective of exploring new research techniques, this study applied two relatively new simulation concepts, copula simulation and conditional kernel density approach, to make the simulation assumptions less restrictive and more consistent with observations. The copula simulation applied in this study allows yield and price to have more flexible joint distribution functions than multivariate normal; the conditional kernel density approach used in farm yield simulation enables the variance of farm yield varies with county yield rather than being constant.Down-side Risk, LPM2 Hedge Model, Government Payments, Crop Insurance Policies, Copula Simulation, Conditional Kernel Density, Agricultural Finance,

A New Determination of e/m from the Zeeman Effect

Values of e/m have been determined from the Zeeman separations of the Cd line 6439 and the Zn line 6362. For these lines the g-factors can be accurately determined from the theory. A magnetic field of 7300 gauss was produced by an air core solenoid in which the variation of field strength over a length of 6 cm at the center was less than 0.1 percent. The field to current ratio, K, of this solenoid was determined in terms of the calculated ratios of three single layer standard solenoids. The field strength during an exposure was then given by the product of this constant and the current flowing. Evaporation of Zn and Cd in the short (6 cm) positive column of a helium discharge tube gave the desired lines. The Zeeman patterns were photographed with a Fabry-Perot interferometer. The result is e/m = 1.7579 ± 0.0025 × 10^7 e.m.u. per gram

Hedging Downside Risk to Farm Income with Futures and Options: Effects of Government Payment Programs and Federal Crop Insurance Plans

The high proportion of government payments in total crop farm income and the purchase of subsidized crop insurance have changed the income distribution of U.S. crop farmers. As a result, the risk management behaviors of U.S. crop farmers are affected by these programs in terms of the use of private market risk management tools, such as futures and options. The objective of this research is to investigate the effects of the government payments and federal crop insurance policies on the usage of futures and options by crop farmers from a downside risk management perspective. Results in this study suggest that both yield insurance and revenue insurance creates more hedging demands for futures. But revenue insurance decreases the buying of put options at the same time. Loan deficiency government payments substitutes largely for the hedging role of put options while Counter Cyclical payments substitutes futures hedge. This research contributes the literature by proposing to use a downside risk hedge model, the second-order lower partial moment (LPM2) hedge model, to investigate the interaction of government and private risk management tools used by crop farmers. This study also initiatively applies the conditional kernel density method and the copula approach in the data simulation process. The conditional kernel density method generates county yield and farm yield with the same conditional pattern as revealed in the historical yields. The copula simulation allows the crop yield and prices have more flexible joint distributions other than bivariate normal.Agricultural and Food Policy, Agricultural Finance,

Motion of magnetic flux through superconducting strips

Electric resistance of superconducting strips in magnetic fiel

Ferromagnetic resonance force microscopy on a thin permalloy film

Ferromagnetic Resonance Force Microscopy (FMRFM) offers a means of performing local ferromagnetic resonance. We have studied the evolution of the FMRFM force spectra in a continuous 50 nm thick permalloy film as a function of probe-film distance and performed numerical simulations of the intensity of the FMRFM probe-film interaction force, accounting for the presence of the localized strongly nonuniform magnetic field of the FMRFM probe magnet. Excellent agreement between the experimental data and the simulation results provides insight into the mechanism of FMR mode excitation in an FMRFM experiment.Comment: 9 pages, 2 figure