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Laser interactions with materials have unique advantages to explore the rapid synthesis, processing, and in situ characterization of high quality and novel nanoparticles, nanotubes and nanowires. For example, laser vaporization of solids into background gases provides a wide range of processing conditions for the formation of nanomaterials by both catalyst-free and catalyst-assisted growth processes. Laser interactions with the growing nanomaterials provide remote in situ characterization of their size, structure, and composition with unprecedented temporal resolution. In this article, laser interactions involved in the synthesis of primarily carbon nanostructures are reviewed, including the catalyst-free synthesis of single-walled carbon nanohorns and quantum dots, to the catalyst-assisted growth of single and multi-walled carbon nanotubes.

Advances in tissue engineering have been accomplished for years by employing biomimetic strategies to provide cells with aspects of their original microenvironment necessary to reconstitute a unit of both form and function for a given tissue.We believe that the most critical hallmark of cancer is loss of integration of architecture and function; thus, it stands to reason that similar strategies could be employed to understand tumor biology. In this commentary, we discuss work contributed by Fischbach-Teschl and colleagues to this special issue of Tissue Engineering in the context of 'tumor engineering', that is, the construction of complex cell culture models that recapitulate aspects of the in vivo tumor microenvironment to study the dynamics of tumor development, progression, and therapy on multiple scales. We provide examples of fundamental questions that could be answered by developing such models, and encourage the continued collaboration between physical scientists and life scientists not only for regenerative purposes, but also to unravel the complexity that is the tumor microenvironment. In 1993, Vacanti and Langer cast a spotlight on the growing gap between patients in need of organ transplants and the amount of available donor organs; they reaffirmed that tissue engineering could eventually address this problem by …

Diabetic retinopathy is the leading cause of blindness in the Western world. The World Health Organisation estimates that 135 million people have diabetes mellitus worldwide and that the number of people with diabetes will increase to 300 million by the year 2025 (Amos et al., 1997). Timely detection and treatment for DR prevents severe visual loss in more than 50% of the patients (ETDRS, 1991). Through computer simulations is possible to demonstrate that prevention and treatment are relatively inexpensive if compared to the health care and rehabilitation costs incurred by visual loss or blindness (Javitt et al., 1994). The shortage of ophthalmologists and the continuous increase of the diabetic population limits the screening capability for effective timing of sight-saving treatment of typical manual methods. Therefore, an automatic or semi-automatic system able to detect various type of retinopathy is a vital necessity to save many sight-years in the population. According to Luzio et al. (2004) the preferred way to detect diseases such as diabetic retinopathy is digital fundus camera imaging. This allows the image to be enhanced, stored and retrieved more easily than film. In addition, images may be transferred electronically to other sites where a retinal specialist or an automated …

In 1968 James T. Gillam was a poorly focused college student at Ohio University who was dismissed and then drafted into the Army. Unlike most African Americans who entered the Army then, he became a Sergeant and an instructor at the Fort McClellan Alabama School of Infantry. In September 1968 he joined the First Battalion, 22nd Regiment of the 4th Infantry Division in Vietnam. Within a month he transformed from an uncertain sergeant—who tried to avoid combat—to an aggressive soldier, killing his first enemy and planning and executing successful ambushes in the jungle. Gillam was a regular point man and occasional tunnel rat who fought below ground, an arena that few people knew about until after the war ended. By January 1970 he had earned a Combat Infantry Badge and been promoted to Staff Sergeant. Then Washington’s politics and military strategy took his battalion to the border of Cambodia. Search-and-destroy missions became longer and deadlier. From January to May his unit hunted and killed the enemy in a series of intense firefights, some of them in close combat. In those months Gillam was shot twice and struck by shrapnel twice. He became a savage, strangling a soldier in hand-to-hand combat …

Transcript of an interview with Paul Anthony Sovik, U.S. Marine Corps (1st Marine Division) World War II veteran. Sovik discusses his family life and childhood in Ohio, decision to enlist with the Marine Corps following the bombing of Pearl Harbor, experiences with the 1st Marine Division in the Pacific Theater during World War II, and post-war life.

Thermochemical processes are being developed to provide global-scale quantities of hydrogen. A variant on sulfur-based thermochemical cycles is the Hybrid Sulfur (HyS) Process, which uses a sulfur dioxide depolarized electrolyzer (SDE) to produce the hydrogen. In the HyS Process, sulfur dioxide is oxidized in the presence of water at the electrolyzer anode to produce sulfuric acid and protons. The protons are transported through a cation-exchange membrane electrolyte to the cathode and are reduced to form hydrogen. In the second stage of the process, the sulfuric acid by-product from the electrolyzer is thermally decomposed at high temperature to produce sulfur dioxide and oxygen. The two gases are separated and the sulfur dioxide recycled to the electrolyzer for oxidation. The Savannah River National Laboratory (SRNL) has been exploring a fuel-cell design concept for the SDE using an anolyte feed comprised of concentrated sulfuric acid saturated with sulfur dioxide. The advantages of this design concept include high electrochemical efficiency and small footprint compared to a parallel-plate electrolyzer design. This paper will provide a summary of recent advances in the development of the SDE for the HyS process.

Climate change projections from three General Circulation Models were used to adjust the temperature and precipitation in 2030 and 2080 in each of five ecological provinces in Tennessee to estimate the direct economic effects of the projected changes on recreation using the Tourism Climatic Index. The indirect effects on recreation were evaluated qualitatively, based on current demand for the unique values associated with current conditions. The results of the direct impact evaluation reveal that climate change will have variable effects on recreational activities in Tennessee. The magnitude and direction of the effects vary by the recreational activity involved, patterns of precipitation and temperature regimes, and specific location in Tennessee. Recreational activities such as rock climbing, winter activities independent of snow, and whitewater boating are likely to benefit from projected climate changes due to increased temperatures in the winter months. Summer-based activities such as lake recreation and camping are likely to decline with increasing seasonal temperatures. The indirect effects of climate change on recreation are likely to have a larger effect than the direct impacts of climatic variables.

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Developing a predictive understanding of subsurface flow and transport is complicated by the disparity of scales across which controlling hydrological properties and processes span. Conventional techniques for characterizing hydrogeological properties (such as pumping, slug, and flowmeter tests) typically rely on borehole access to the subsurface. Because their spatial extent is commonly limited to the vicinity near the wellbores, these methods often can not provide sufficient information to describe key controls on subsurface flow and transport. The field of hydrogeophysics has evolved in recent years to explore the potential that geophysical methods hold for improving the quantification of subsurface properties and processes relevant for hydrological investigations. This chapter is intended to familiarize hydrogeologists and water resource professionals with the state-of-the-art as well as existing challenges associated with hydrogeophysics. We provide a review of the key components of hydrogeophysical studies, which include: geophysical methods commonly used for shallow subsurface characterization; petrophysical relationships used to link the geophysical properties to hydrological properties and state variables; and estimation or inversion methods used to integrate hydrological and geophysical measurements in a consistent manner. We demonstrate the use of these different geophysical methods, petrophysical relationships, and estimation approaches through several field-scale case studies. Among other applications, …

This document provides information on how to "prevent or minimize problems associated with bats" in a school environment. (p. 1).

Vitrification is currently the most widely used technology for the treatment of high level radioactive wastes (HLW) throughout the world. Most of the nations that have generated HLW are immobilizing in either borosilicate glass or phosphate glass. One of the primary reasons that glass has become the most widely used immobilization media is the relative simplicity of the vitrification process, e.g. melt waste plus glass forming frit additives and cast. A second reason that glass has become widely used for HLW is that the short range order (SRO) and medium range order (MRO) found in glass atomistically bonds the radionuclides and governs the melt properties such as viscosity, resistivity, sulphate solubility. The molecular structure of glass controls contaminant/radionuclide release by establishing the distribution of ion exchange sites, hydrolysis sites, and the access of water to those sites. The molecular structure is flexible and hence accounts for the flexibility of glass formulations to waste variability. Nuclear waste glasses melt between 1050-1150 C which minimizes the volatility of radioactive components such as Tc{sup 99}, Cs{sup 137}, and I{sup 129}. Nuclear waste glasses have good long term stability including irradiation resistance. Process control models based on the molecular structure of glass have been …

Logbook from the KXAS-TV/NBC station in Fort Worth, Texas, documenting the names, locations, and run-times of video-taped news segments that aired each day from January through June in 2010.

Logbook from the KXAS-TV/NBC station in Fort Worth, Texas, documenting the names, locations, and run-times of video-taped news segments that aired each day from July through December in 2010.

In the 1840s an organization of German noblemen, the Mainzner Adelsverein, attempted to settle thousands of German emigrants on the Texas frontier. Nassau Plantation, located near modern-day Round Top, Texas, in northern Fayette County, was a significant part of this story. James C. Kearney has studied a wealth of original source material (much of it in German) to illuminate the history of the plantation and the larger goals and motivation of the Adelsverein. This new study highlights the problematic relationship of German emigrants to slavery. Few today realize that the society’s original colonization plan included ownership and operation of slave plantations. Ironically, the German settlements the society later established became hotbeds of anti-slavery and anti-secessionist sentiment. Several notable personalities graced the plantation, including Carl Prince of Solms-Braunfels, Johann Otto Freiherr von Meusebach, botanist F. Lindheimer, and the renowned naturalist Dr. Ferdinand Roemer. Dramatic events also occurred at the plantation, including a deadly shootout, a successful escape by two slaves (documented in an unprecedented way), and litigation over ownership that wound its way to both the Texas Supreme Court and the U.S. Supreme Court.

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Louisiana’s Neutral Strip, an area of pine forests, squats between the Calcasieu and Sabine Rivers on the border of East Texas. Originally a lawless buffer zone between Spain and the United States, its hardy residents formed tight-knit communities for protection and developed a reliance on self, kin, and neighbor. In the early 1900s, the timber boom sliced through the forests and disrupted these dense communities. Mill towns sprang up, and the promise of money lured land speculators, timber workers, unionists, and a host of other characters, such as the outlaw Leather Britches Smith. That moment continues to shape the place’s cultural consciousness, and people today fashion a lore connected to this time. In a fascinating exploration of the region, Keagan LeJeune unveils the legend of Leather Britches, paralleling the stages of the outlaw’s life to the Neutral Strip’s formation. LeJeune retells each stage of Smith’s life: his notorious past, his audacious deeds of robbery and even generosity, his rumored connection to a local union strike—the Grabow War—significant in the annals of labor history, and his eventual death. As the outlaw’s life vividly unfolds, Always for the Underdog also reveals the area’s history and cultural landscape. Often using the particulars of …

This book provides a history of the Texas Pedernales Falls State Park.

Interview with J. Brown, a teacher, rancher, stagecoach-builder, and longtime resident of Weatherford, Texas. Brown discusses his family history, his education and family, working the Wild West Show at Six Flags, building stagecoaches, the history of the stagecoach, and a tour of his shop.

Transcript of an interview with Coy Carter, longtime resident of Weatherford, Texas, discussing his childhood in Weatherford and Spring Creek, Texas; farming in Spring Creek; memories of the Great Depression; ranching; tenure as sheriff.

Interview with Raymond Curtis, longtime resident and school administrator of Weatherford, Texas, as part of the Weatherford Oral History Project. The interview includes Curtis' personal experiences of farm life in the Great Depression, childhood in Collin County, Texas, and education at the University of North Texas under the GI Bill. Additionally, Curtis discusses his family history, his career as a teacher, administrator, and coach in various public school districts, the integration of Weatherford schools, the school-building program, and his career as CEO of the Weatherford Chamber of Commerce.

Transcript of an interview with Donald Davis who shares his childhood memories growing up in a family of eight children on a farm in Weatherford, Texas during the Great Depression, career, and family life with wife and four children.

Interview with Bob Glenn, longtime resident of Weatherford, Texas, as part of the Weatherford Oral History Project. The interview includes Glenn's personal experiences of childhood and education in Weatherford, his 1961 enlistment in the U.S. Army, service at various stateside bases, and his career in the banking industry. Glenn also discusses changes in the Weatherford economy.

Interview with Roy J. Grogan, longtime Weatherford resident and elected official, as part of the Weatherford Oral History Project. The interview includes Grogan's personal experiences of childhood and education in Weatherford, Depression-era struggles, enlisting in the U.S. Navy, and World War II. Additionally, Grogan talks about his studies at Weatherford College, Duke University, and Duke Law, his legal career with the FBI and as a land developer, his political career on the Weatherford City Council and Weatherford College Board of Regents, the integration of Weatherford schools, and his involvement in state party politics. The interview includes an appendix with Grogan's resume.