Ethnic Conversions : Family, Community, Women, and Kinwork

According to the straight-line theory of assimilation, ethnic groups by the third or fourth generation should be entirely assimilated into mainstream society and should identify themselves as Americans. Yet there has been a resurgence of ethnicity among white ethnics in the United States that has led to a renewed interest in particular ethnic groups and their cultures. Third- and fourth-generation European Americans claim an ethnic identity even though their ties to their ancestral homeland may be tenuous. Lithuanian Americans in Kansas City, Kansas, in the 1950s, 1960s and 1970s would seem to provide support for the straight-line theory of assimilation, yet since the 1980s they have reconstituted themselves through the Lithuanians of America organization and are experiencing a renewal of their ethnic identity. The Lithuanian American community in Seattle, Washington, also experienced ebbs and flows in the activism and unity of its members. The community was active at the turn of the twentieth century, next revitalized by Lithuanian emigres following World War II, and then became active again in the late 1970s after a decade of inaction. Members of the two groups were given questionnaires in the early 1990s to address the ethnic identity fluctuations as well as the role of non-ethnics in the organizations. One of the more exciting findings from the surveys and from participant observation was the extensive role of ethnic converts in the Kansas City organization, and their lesser (but still significant) role in the Seattle Lithuanian-American community

The Importance of Families and Communities in Understanding Ethnicity

Social science provides us with a variety of theories that attempt to explain the dynamics of race and ethnicity. Many of these theories are concerned with the basic question of ethnic difference: its origins, persistence, and decline. In the contemporary literature on immigration to the United States and on how immigrants adjust to that relocation, assimilation and the persistence of ethnic identity have often been considered polar opposites.^1 Researchers, however, are beginning to find that both processes often occur simultaneously, as when immigrants become acculturated into American society but also maintain or even construct distinct ethnic identities, often symbolically. ^2 Even though a generation of immigrants may give up their ethnic identities, adopt the host language, and intermarry, their children or grandchildren may choose to renew ancestral ethnicities, and in so doing, may even contribute to the re-ethnicization of their parents as adults. Ethnicity (and ethnic identity), therefore, is both a conservative force as well as an agent of change.^3 The articles in this special issue of Ethnic Studies Review explore the dynamics of ethnicity in the United States and contextualize the experience of various groups within families and communities

The effect of blade aerodynamic modelling on the prediction of high-frequency rotor airloads

Interactions between the blades and vortical structures within the wake of a helicopter rotor are a significant source of impulsive loading and noise, particularly in descending flight. Brown's Vorticity Transport Model has been used to investigate the influence of the fidelity of the local blade aerodynamic model on the accuracy with which the high-frequency airloads associated with blade-vortex interactions can be predicted. The Vorticity Transport Model yields a very accurate representation of the structure of the wake, and allows significant flexibility in the way that the blade loading, and hence the source of vorticity into the wake, can be represented. Two models for the local blade aerodynamics are compared. The first is a simple lifting-line model and the second is a somewhat more sophisticated lifting-chord model based on unsteady thin aerofoil theory. A marked improvement in accuracy of the predicted high-frequency airloads of the HART II rotor is obtained when the lifting-chord model for the blade aerodynamics is used instead of the lifting-line type approach. Errors in the amplitude and phase of the loading peaks are reduced and the quality of the prediction is affected to a lesser extent by the computational resolution of the wake. Indeed, the lifting-line model increasingly overpredicts the amplitude of the lift response to blade-vortex interactions as the computational grid is refined, exposing clearly the fundamental deficiencies in this commonly-used approach particularly when modelling the aerodynamic response of the blade to interactions with vortices that are much smaller than its chord. In comparison, the airloads that are predicted using the lifting-chord model are relatively insensitive to the resolution of the computation, and there are fundamental reasons to believe that properly converged numerical solutions may be attainable using this approach

Selected Readings on Ethnicity, Family and Community

Selected Readings on Ethnicity, Family and Community; compiled by Mary E. Kelly, Central Missouri State University, and Thomas W. Sanchez, University of Nebraska- Lincoln

Alien Registration- Kelly, Mary E. (Calais, Washington County)

https://digitalmaine.com/alien_docs/2593/thumbnail.jp

Predicting the high-frequency airloads and acoustics associated with blade-vortex interaction

As a rotorcraft descends or manoeuvres, the interactions which occur between the rotor blades and vortical structures within the rotor wake produce highly impulsive loads on the blades and with these a highly intrusive external noise. Brown’s Vorticity Transport Model has been used to investigate the influence of the fidelity of the local blade aerodynamic model on the quality of the prediction of the high-frequency airloads associated with blade-vortex interactions and thus on the accuracy with which the acoustic signature of the aircraft can be predicted. Aerodynamic, wake structure and acoustic predictions using the Vorticity Transport Model are compared against the HART II wind tunnel data for an experimental rotor based on the characteristics of the Bo105 rotor. The model can resolve very accurately the structure of the wake, and allows significant flexibility in the way that the blade loading can be represented. The predictions of two models for the local blade aerodynamics are compared for all three of the HART II flight cases. The first model is a simple lifting-line model and the second is a somewhat more sophisticated lifting-chord model based on unsteady thin aerofoil theory. The predicted positions of the vortex cores agree with measured data to within a fraction of the blade chord, and the strength of the vortices is preserved to well downstream of the rotor, essentially independently of the resolution of the calculation or the blade model used. A marked improvement in accuracy of the predicted high-frequency airloads and acoustic signature of the HART II rotor is obtained when the lifting-chord model for the blade aerodynamics is used instead of the lifting-line type approach. Errors in the amplitude and phase of the loading peaks are reduced and the quality of the prediction is affected to a lesser extent by the computational resolution of the wake. Predictions of the acoustic signature of the rotor are similarly affected, with the lifting-chord model at the highest resolution producing the best representation of the distribution of sound pressure on the ground plane below the rotor

Water Management in the Binational Texas/Mexico Rio Grande/Rio Bravo Basin [abstract]

2 pages