A Rising Image and a Brighter Future: Gettysburg College in Spring 1929

The spring semester of 1929 at Gettysburg College saw a unique combination of ambition and aspiration from many different quarters of the college community. While the college still struggled with antiquated student life and a male-dominated population, the college broke new ground by building its first ever library, winning the conference basketball title, and seeing a new generation of female students gain academic prominence. At the peak of the Roaring Twenties and led by College President Henry Hanson, Gettysburg College was creating for itself a brighter future

From Professor-Student to Collaborators

I had not met Michael Ritterson before he visited the Conservation Lab at Special Collections, where he was having a book mended, but I had certainly heard of him. A former faculty member of the German department, Mr. Ritterson is now a German translator, taking on projects from translating the work of a 17th German woman’s study of butterflies to the poetry of a Berlin leftist written during the 1968 Movement. And, by previous contact in the mail, he had heard of me. So after Mary Wooton showed him the fully repaired book, we were formally introduced and had the opportunity to discuss his translating projects. It was more than an opportunity to chat with an interesting visitor; it was an opportunity to share talents and abilities. [excerpt

Where Have All the Symbols Gone?: A Study of Sufis and Sufi Symbolism in Ottoman Miniature Paintings

Ottoman miniature paintings represent some of the best preserved and documented works of Islamic art still extant. They differ critically from other forms of miniature painting, such as Persian miniature painting, by not representing Sufi symbolism. In the two potential sources of such symbolism, Ottoman Sufism and Persian miniature painters in the Ottoman Empire, appear to have not critically influenced Ottoman miniature painting to produce Sufi symbols, do to political, religious, and cultural factors. Instead, political factors of the Ottoman imperial state and the economics and standards of production in the empire produced an art medium where Ottoman Sufi symbols were not introduced

A Simple Boltzmann Transport Equation for Ballistic to Diffusive Transient Heat Transport

Developing simplified, but accurate, theoretical approaches to treat heat transport on all length and time scales is needed to further enable scientific insight and technology innovation. Using a simplified form of the Boltzmann transport equation (BTE), originally developed for electron transport, we demonstrate how ballistic phonon effects and finite-velocity propagation are easily and naturally captured. We show how this approach compares well to the phonon BTE, and readily handles a full phonon dispersion and energy-dependent mean-free-path. This study of transient heat transport shows i) how fundamental temperature jumps at the contacts depend simply on the ballistic thermal resistance, ii) that phonon transport at early times approach the ballistic limit in samples of any length, and iii) perceived reductions in heat conduction, when ballistic effects are present, originate from reductions in temperature gradient. Importantly, this framework can be recast exactly as the Cattaneo and hyperbolic heat equations, and we discuss how the key to capturing ballistic heat effects is to use the correct physical boundary conditions.Comment: 9 pages, 5 figure

Time Reversal of Some Stationary Jump-Diffusion Processes from Population Genetics

We describe the processes obtained by time reversal of a class of stationary jump-diffusion processes that model the dynamics of genetic variation in populations subject to repeated bottlenecks. Assuming that only one lineage survives each bottleneck, the forward process is a diffusion on [0,1] that jumps to the boundary before diffusing back into the interior. We show that the behavior of the time-reversed process depends on whether the boundaries are accessible to the diffusive motion of the forward process. If a boundary point is inaccessible to the forward diffusion, then time reversal leads to a jump-diffusion that jumps immediately into the interior whenever it arrives at that point. If, instead, a boundary point is accessible, then the jumps off of that point are governed by a weighted local time of the time-reversed process.Comment: 23 pages, 1 figure, Advances in Applied Probability Vol 42, No 4, p 1147-1171, 201

Lexical stress information modulates the time-course of spoken-word recognition

Segmental as well as suprasegmental information is used by Dutch listeners to recognize words. The time-course of the effect of suprasegmental stress information on spoken-word recognition was investigated in a previous study, in which we tracked Dutch listeners' looks to arrays of four printed words as they listened to spoken sentences. Each target was displayed along with a competitor that did not differ segmentally in its first two syllables but differed in stress placement (e.g., 'CENtimeter' and 'sentiMENT'). The listeners' eye-movements showed that stress information is used to recognize the target before distinct segmental information is available. Here, we examine the role of durational information in this effect. Two experiments showed that initial-syllable duration, as a cue to lexical stress, is not interpreted dependent on the speaking rate of the preceding carrier sentence. This still held when other stress cues like pitch and amplitude were removed. Rather, the speaking rate of the preceding carrier affected the speed of word recognition globally, even though the rate of the target itself was not altered. Stress information modulated lexical competition, but did so independently of the rate of the preceding carrier, even if duration was the only stress cue present

Formation of Subgap States in Carbon Nanotubes Due to a Local Transverse Electric Field

We introduce two simple models to study the effect of a spatially localized transverse electric field on the low-energy electronic structure of semiconducting carbon nanotubes. Starting from the Dirac Hamiltonian for the low energy states of a carbon nanotube, we use scattering theory to show that an arbitrarily weak field leads to the formation of localized electronic states inside the free nanotube band gap. We study the binding energy of these subgap states as a function of the range and strength of the electrostatic potential. When the range of the potential is held constant and the strength is varied, the binding energy shows crossover behavior: the states lie close to the free nanotube band edge until the potential exceeds a threshold value, after which the binding energy increases rapidly. When the potential strength is held constant and the range is varied, we find resonant behavior: the binding energy passes through a maximum as the range of the potential is increased. Large electric fields confined to a small region of the nanotube are required to create localized states far from the band edge.Comment: 15 pages + 5 figures, 1 table in RevTe