The Brutal Murder of George J. Bushman

In the fall of 1918 there occurred in Adams County a singularly brutal murder that brought the County and the town of Gettysburg to a shocked standstill. The tentacles of this event would reach into four Pennsylvania counties: Adams, Cumberland, Dauphin, and Philadelphia, and eventually the Pennsylvania Supreme Court. The investigation of the crime and the trial of the perpetrators involved so many public officials and families, as well as the extended judicial system and geographical locations within and without the County, that we have included a Cast of Characters and Locations to assist the reader in following this convoluted tale

The South African Textile Industry: Challenges and Opportunities

The full integration of the textile industry into GATT, which with some exceptions occurred on January 1, 2005, is likely to greatly impact the global textile and apparel industries. In particular,one prediction is that the South African industries are likely to be "decimated." The actual effect on these industries in an individual country will depend at least partly on the ability to take advantage of economies of scale and to be internationally competitive. In an endeavor to gain more insights into the future of these industries in South Africa, this study uses a cost function to investigate the presence of scale economies and the nature of input interrelationships. The findings include statistically significant economies of scale present in both industries and cross price elasticity estimates indicating that most inputs are substitutes for one another. The first result offers an opportunity to reduce unit costs, if these industries can grow their markets. However, lower prices on imported intermediate goods will likely decrease the demand for domestic inputs. The cross price elasticities of demand are relatively low in some cases, consistent with domestic input market rigidities and international trade restrictions. More recent data might bring findings of higher cross elasticities in the new international environment.South Africa, Textile Industry

NEW CHALLENGES FOR THE SOUTH AFRICAN TEXTILE AND APPAREL INDUSTRIES IN THE GLOBAL ECONOMY

The full integration of the textile industry into GATT, which with some exceptions occurred on January 1, 2005, is likely to greatly impact the global textile and apparel industries. In particular, one prediction is that the South African industries are likely to be ¡°decimated.¡± The actual effect on these industries will depend at least partly on the ability to take advantage of economies of scale and to be internationally competitive. In an endeavor to gain more insights into the future of these industries in South Africa, this study uses a cost function to investigate the presence of scale economies and the nature of input interrelationships. The findings include statistically significant economies of scale present in both industries and cross price elasticity estimates indicating that most inputs are substitutes for one another. The first result offers an opportunity to reduce unit costs if these industries can grow their markets. However, lower prices on imported intermediate goods will likely decrease the demand for domestic inputs. The cross price elasticities of demand are relatively low in some cases, consistent with domestic input market rigidities and international trade restrictions.South Africa, Textile Industry, Apparel Industry

NAFTA¡¯S IMPACT ON THE MEXICAN AUTOMOTIVE SECTOR

The findings discussed here are the outcome of continuing research on the Mexican automotive industry and include data for several years during which the NAFTA was in effect. Key results include strong evidence of constant returns to scale in both the automotive industry as a whole as well as the vehicle assembly industry and a finding that the period after NAFTA was implemented has been associated with lower production costs. In addition, these data support the conclusion that capital, labor, and foreign intermediate goods are all substitutes for one another, as are capital and domestic intermediate goods, but that labor and domestic intermediate goods are complements. While evidence was found to suggest some increased responsiveness in domestic markets to both foreign and domestic input prices, other results give reason for concern about continuing market impediments in Mexico.Mexico, Automotive Industry, NAFTA

Ionization--induced star formation V: Triggering in partially unbound clusters

We present the fourth in a series of papers detailing our SPH study of the effects of ionizing feedback from O--type stars on turbulent star forming clouds. Here, we study the effects of photoionization on a series of initially partially unbound clouds with masses ranging from $10^{4}$--$10^{6}$M$_{\odot}$ and initial sizes from 2.5-45pc. We find that ionizing feedback profoundly affects the structure of the gas in most of our model clouds, creating large and often well-cleared bubble structures and pillars. However, changes in the structures of the embedded clusters produced are much weaker and not well correlated to the evolution of the gas. We find that in all cases, star formation efficiencies and rates are reduced by feedback and numbers of objects increased, relative to control simulations. We find that local triggered star formation does occur and that there is a good correlation between triggered objects and pillars or bubble walls, but that triggered objects are often spatially-mixed with those formed spontaneously. Some triggered objects acquire large enough masses to become ionizing sources themselves, lending support to the concept of propagating star formation. We find scant evidence for spatial age gradients in most simulations, and where we do see them, they are not a good indicator of triggering, as they apply equally to spontaneously-formed objects as triggered ones. Overall, we conclude that inferring the global or local effects of feedback on stellar populations from observing a system at a single epoch is very problematic.Comment: 17 pages, 11 figures (mostly degraded to get under the submission size limit), accepted by MNRA

Ionizing feedback from massive stars in massive clusters III: Disruption of partially unbound clouds

We extend our previous SPH parameter study of the effects of photoionization from O-stars on star-forming clouds to include initially unbound clouds. We generate a set of model clouds in the mass range $10^{4}-10^{6}$M$_{\odot}$ with initial virial ratios $E_{\rm kin}/E_{\rm pot}$=2.3, allow them to form stars, and study the impact of the photoionizing radiation produced by the massive stars. We find that, on the 3Myr timescale before supernovae are expected to begin detonating, the fractions of mass expelled by ionizing feedback is a very strong function of the cloud escape velocities. High-mass clouds are largely unaffected dynamically, while lower-mass clouds have large fractions of their gas reserves expelled on this timescale. However, the fractions of stellar mass unbound are modest and significant portions of the unbound stars are so only because the clouds themselves are initially partially unbound. We find that ionization is much more able to create well-cleared bubbles in the unbound clouds, owing to their intrinsic expansion, but that the presence of such bubbles does not necessarily indicate that a given cloud has been strongly influenced by feedback. We also find, in common with the bound clouds from our earlier work, that many of the systems simulated here are highly porous to photons and supernova ejecta, and that most of them will likely survive their first supernova explosions.Comment: 14 pages, 13 figures (some degraded and greyscaled), accepted by MNRA

Slave finite element for non-linear analysis of engine structures. Volume 2: Programmer's manual and user's manual

The programming aspects of SFENES are described in the User's Manual. The information presented is provided for the installation programmer. It is sufficient to fully describe the general program logic and required peripheral storage. All element generated data is stored externally to reduce required memory allocation. A separate section is devoted to the description of these files thereby permitting the optimization of Input/Output (I/O) time through efficient buffer descriptions. Individual subroutine descriptions are presented along with the complete Fortran source listings. A short description of the major control, computation, and I/O phases is included to aid in obtaining an overall familiarity with the program's components. Finally, a discussion of the suggested overlay structure which allows the program to execute with a reasonable amount of memory allocation is presented

Hands-on Gravitational Wave Astronomy: Extracting astrophysical information from simulated signals

In this paper we introduce a hands-on activity in which introductory astronomy students act as gravitational wave astronomers by extracting information from simulated gravitational wave signals. The process mimics the way true gravitational wave analysis will be handled by using plots of a pure gravitational wave signal. The students directly measure the properties of the simulated signal, and use these measurements to evaluate standard formulae for astrophysical source parameters. An exercise based on the discussion in this paper has been written and made publicly available online for use in introductory laboratory courses.Comment: 5 pages, 4 figures; submitted to Am. J. Phy

Disc Clearing of Young Stellar Objects: Evidence for Fast Inside-out Dispersal

The time-scale over which and the modality by which young stellar objects (YSOs) disperse their circumstellar discs dramatically influences the eventual formation and evolution of planetary systems. By means of extensive radiative transfer (RT) modelling, we have developed a new set of diagnostic diagrams in the infrared colour-colour plane (K-[24] vs. K-[8]), to aid with the classification of the evolutionary stage of YSOs from photometric observations. Our diagrams allow the differentiation of sources with unevolved (primordial) discs from those evolving according to different clearing scenarios (e.g. homologous depletion vs. inside-out dispersal), as well as from sources that have already lost their disc. Classification of over 1500 sources in 15 nearby star-forming regions reveals that approximately 39 % of the sources lie in the primordial disc region, whereas between 31 % and 32 % disperse from the inside-out and up to 22 % of the sources have already lost their disc. Less than 2 % of the objects in our sample lie in the homogeneous draining regime. Time-scales for the transition phase are estimated to be typically a few 10^5 years independent of stellar mass. Therefore, regardless of spectral type, we conclude that currently available infrared photometric surveys point to fast (of order 10 % of the global disc lifetime) inside-out clearing as the preferred mode of disc dispersal.Comment: 31 pages, 21 figures, 6 tables, accepted for publication in MNRA