An Introduction to Pure Spinor Superstring Theory

In these lecture notes presented at the 2015 Villa de Leyva Summer School, we give an introduction to superstring theory. We begin by studying the particle and superparticle in order to get a better understanding on the superstring side. Afterwards, we review the pure spinor formalism and end by computing the scattering amplitude for three gravitons at tree-level.Comment: Villa de Leyva Summer School 2015 proceedings, 28 pages, 2 figure

Phrasal Alternation in the Pondok Tinggi Dialect of Kerinci; an Intergenerational Analysis

This paper examines the implications of language contact in a Malay sub-variety known as Pondok Tinggi, spoken in Sumatra. My focus is on the grammatical phenomenon of phrasal alternation. Phrasal alternation is characterized by the presence of two distinct forms for nearly all lexical items, whose final syllables differ in shape. These are termed absolute and oblique (Steinhauer and Usman 1978: 485). The intergenerational transmission of this uncommon feature offers a way to measure the degree of contact-induced language change in Pondok Tinggi. An experiment was conducted to elicit the USAge of the absolute and the oblique forms in order to find out how the distribution of phrasal alternation has changed within the last two generations. I reveal a grammatical simplification caused by contact between Pondok Tinggi and Bahasa Indonesia, a related Malayic variety serving as Indonesia's prestigious official language. This adds a dimension of loss of local linguistic diversity to more familiar tropes of the national success of Bahasa Indonesia

Production of circular polymer-glass fabric composites

Potentially automated pultrusion technique has been provided for production of curved, glass-reinforced polyimide, epoxy, and graphite reinforced structures. Specially designed apparatus has been manufactured for production of curved structures

Simultaneous processing of vibration test data

Data from record tracks of all accelerometers is injected simultaneously into electronic circuits which convert inputs into single, composite graphical representation. Three adequate methods of processing data: peak acceleration at a frequency, average of all channels, and quad-mean of all channels