Library: Best sellers

Young stars are surrounded by massive, rotating disks of dust and gas, which supply a reservoir of material that may be incorporated into planets or accreted onto the central star. In this dissertation, I use high angular resolution observations at a range of wavelengths to understand the structure, ubiquity, and evolutionary timescales of protoplanetary disks. First, I describe a study of Class I protostars, objects believed to be at an evolutionary stage between collapsing spherical clouds and fully-assembled young stars surrounded by protoplanetary disks. I use a Monte Carlo ra...

This research used the online experiment, the Berkana Community of Conversations (BCC), as a case study to explore learning and leadership in a self-organizing online microworld (an internet “small world” with rules of engagement simulating complex adaptive organization(s)). Based on theories of learning (Papert, 1996), biology of consciousness (Maturana and Varela, 1992), and integral models (Wilber, 1996), an integral methodological design, analyzed languaging and relationships as key data sources. Leadership was mapped as a continuum of behaviors that created effective processes for ...

For many applications, including power generation, aerospace and the automobile industry, high temperature wear provides serious difficulties where two or more surfaces move or slide relative to one another. In aerospace, for example, demands for more powerful, efficient engines operating at ever higher temperatures, mean that conventional lubrication is no longer sufficient to prevent direct contact between metallic sliding surfaces, accelerating wear. However, one high temperature phenomenon observed to reduce metallic contact, and thus wear and friction, is the formation of ‘glazes’,essen...

Women experience sexual and domestic violence at alarmingly high rates. Recovery from this type of trauma can be a complex and extensive process, that in best cases, involves a broad network for support. This dissertation examined the experiences of women over the age of 21 who have received massage therapy during their healing process from sexual or domestic violence. For the purposes of this study, the women who participated were often referred to as “survivors of abuse.” Current research examined in the literature review indicates that the effects of this type of trauma are ...

This dissertation proposes a computational technique for automated "invention" of conceptual schemes of thermal systems. The input provided to the automated problem solver is a description of the streams entering and leaving the system. The output is a network of elementary processes: compression, expansion, heating, cooling, and chemical processes. The problem solver seeks a network that is feasible, and offers an optimal (or at least favorable) combination of energy and capital costs. The synthesis process is modeled as a heuristic search conducted in a state-space of all possible design ver...

As late as 1995, the anticipated widespread population of primeval galaxies remained at large, lurking undetected at unknown redshifts, with undiscovered properties. We present results from our efforts to detect and characterize primeval galaxies by their signature high-redshift Lyman-alpha emission lines utilizing two observational techniques: serendipitous slit spectroscopy and narrowband imaging. By pushing these techniques to their utmost limits, we probe the Lyman-alpha-emitting galaxy population out to redshifts as high as z = 6.5. Galaxies at this epoch reside in a universe which is ...

We study the properties of star-forming galaxies at redshift z~2, an era in which a substantial fraction of the stellar mass in the universe formed. Using 114 near-IR spectra of the H-alpha and [N II] emission lines and model spectral energy distributions fit to rest-frame UV through IR photometry, we examine the galaxies' star formation properties, dynamical masses and velocity dispersions, spatially resolved kinematics, outflow properties, and metallicities as a function of stellar mass and age. While the stellar masses of the galaxies in our sample vary by a factor of ~500, dynami...

Genetically modified foods present numerous ethical, environmental, health and legal challenges. This report synthesizes information from many websites, scientific journals, newspapers and books that discuss the controversy surrounding genetically modified foods. The author has attempted to show that although the future applications of agrobiotechnology appear promising, the ways in which it is currently being used and regulated should be evaluated with a healthy degree of skepticism.

This cross-cultural content analysis (which merged traditional content analysis method with semiotic concepts) compared advertising in the United States (a highly individualistic and low-context culture) and India (a highly collectivist and high-context culture). The study examined the characteristics, differences and similarities in advertising strategies and expressions. A stratified random sample of advertisements for consumer products was selected from nationally circulated news magazines and business magazines of each country between January 1993 and December 1994 (Time and Business W...

The Yasukuni Shrine -- Japan's national memorial enshrining the spirits of Japanesesoldiers killed in domestic and foreign wars -- occupies a peculiar chapter in Japanese history. Originally designed as a sanctuary to house the spirits of those who died in overthrowing the Tokugawa Regime, Yasukuni was nurtured by the state and then the military into a powerful religious and iconographic center to promote Japanese ultranationalism. Following the close of World War II, the Shrine became the subject of intense politico-religious debates as the Japanese, with the assistance of the internati...