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Full-Text Articles in Physics
The Effects Of Pentachlorophenol On The Electrical Conductivity Of Lipid Bilayer Membranes, William Harvey Perman
The Effects Of Pentachlorophenol On The Electrical Conductivity Of Lipid Bilayer Membranes, William Harvey Perman
Dissertations and Theses
The effects of pentachlorophenol (PCP), a widely used pesticide, on the electrical characteristics of lipid bilayer membranes has been studied. When a small amount of PCP (even at a concentration of a few micromoles per liter) is present in the electrolytic solution surrounding the membrane, the electrical conductivity of the membrane significantly increases. The present work was concerned with detailed measurements of the changes in the conductivity caused by PCP under chemically controlled conditions. The experimental results were analyzed to determine the permanent species in the membrane, and an attempt was made to correlate the data with existing models of …
On The Reduction Of Many-Body Dielectric Theories To The Onsager Equation, John D. Ramshaw
On The Reduction Of Many-Body Dielectric Theories To The Onsager Equation, John D. Ramshaw
Physics Faculty Publications and Presentations
An approximate theory for the dielectric constant ℇ of a dense polar fluid was derived by Ramshaw, Schaefer, Waugh, and Deutch (RSWD). In the present article, the RSWD theory is generalized and made rigorous by another method of derivation. The result is a rigorous expression for ℇ which differs from the RSWD expression by the presence of a fluctuation term. Both the rigorous expression and the RSWD expression are then specialized to the Onsager model. It is found that the rigorous expression for ℇ reduces to the Onsager equation, but that the RSWD expression does not because the fluctuation term …
Vibration Damping Characteristics Of Typical Harpsichord Strings, Jack Lee Simmons
Vibration Damping Characteristics Of Typical Harpsichord Strings, Jack Lee Simmons
Dissertations and Theses
Present-day builders of harpsichords disagree as to the use of iron or carbon-steel wire in their attempt to duplicate the tonal qualities of the early 16th century instruments. The variations in tone produced by vibrating iron and steel wires may be due, at least in part, to differences in their decay characteristics. A wire was set into vibration by placing a section in a magnetic field and passing a variable-frequency alternating current through it. A condition of resonance was established by appropriately selecting frequencies, lengths, and tensions that would simultaneously satisfy the relationship: fr = n/2L(T/p)1/2. Then measurements of decay …
Cryogenic Thin-Film Electron Emitters, Pavel Smejtek, David G. Onn, M. Silver
Cryogenic Thin-Film Electron Emitters, Pavel Smejtek, David G. Onn, M. Silver
Physics Faculty Publications and Presentations
Thin‐film electron emitters are described, which operate below 200°K and below a limiting critical applied voltage (νc) in a stable temperature‐independent regime. Current‐voltage characteristics and normal electron energy distributions are presented. Fabrication and operation criteria are outlined. Comparison with temperature‐dependent emitters is made, and possible conduction mechanisms discussed briefly.
Heat Transfer Across Carbon-Liquid Helium I Interface, Constantine Antonopoulos
Heat Transfer Across Carbon-Liquid Helium I Interface, Constantine Antonopoulos
Dissertations and Theses
The subject to be discussed in this thesis is an experimental problem in heat transfer across a carbon-liquid helium I interface. The interest in this particular problem arose from experimental work first presented by Luce (1) concerning a similar heat transfer problem from a heated bismuth surface immersed in liquid helium. This study produced some interesting results which it was hoped could be duplicated with carbon. The choice of carbon as an alternative material was based on reasons which will be discussed later. Before beginning a detailed discussion of the problem a history of its development and the results which …