Q+\mathcal{Q}^{+}: Characterising the structure of young star clusters

Many young star clusters appear to be fractal, i.e. they appear to be concentrated in a nested hierarchy of clusters within clusters. We present a new algorithm for statistically analysing the distribution of stars to quantify the level of sub-structure. We suggest that, even at the simplest level, the internal structure of a fractal cluster requires the specification of three parameters. (i) The 3D fractal dimension, $\mathcal{D}$, measures the extent to which the clusters on one level of the nested hierarchy fill the volume of their parent cluster. (ii) The number of levels, $\mathcal{L}$, reflects the finite ratio between the linear size of the large root-cluster at the top of the hierarchy, and the smallest leaf-clusters at the bottom of the hierarchy. (iii) The volume-density scaling exponent, $\mathcal{C}=-\textrm{d}\ln[\delta n]/\textrm{d}\ln[L]$ measures the factor by which the excess density, $\delta n$, in a structure of scale $L$, exceeds that of the background formed by larger structures; it is similar, but not exactly equivalent, to the exponent in Larson's scaling relation between density and size for molecular clouds. We describe an algorithm which can be used to constrain the values of $({\cal D},{\cal L},{\cal C})$ and apply this method to artificial and observed clusters. We show that this algorithm is able to reliably describe the three dimensional structure of an artificial star cluster from the two dimensional projection, and quantify the varied structures observed in real and simulated clusters.Comment: Accepted by MNRA

Redefining the Agency of Jewish Communities Through Ghetto Humor

While the Holocaust is remembered by historians and victims as a time of suffering and genocide, Jewish ghetto survivors recall numerous occasions in which humor was used to combat the oppression of Nazi authorities. Although many historians emphasized the physical hardships and tragic conditions faced by Jewish victims of the Holocaust, the existence of jokes throughout Eastern European ghettos articulated the legitimacy of humor within the greater context and discussion of coping, resistance, and unification for the preservation of Jewish life and identity in the post-war period. Rather than depicting Jews as solely victims, humor returns agency to the Jews who lived in ghettos by highlighting the complexity of their reality without overgeneralizing their experiences

Australia and A Wire Through the Heart

Throughout a period of exploration in the colony of Australia, the development of the Overland Telegraph, as discovered by Charles Todd, increased Australian interaction on a global scale. Although the documentary A Wire Through the Heart does not depict all of the complex struggles English colonizers faced when settling Australia, the film accurately reflects the technological advancements, the significance of explorers, and environmental difficulties many colonizers encountered in Australia throughout the early 1800s. Alongside the increase in communication with the rest of the world, the Overland Telegraph assisted in the development of a unique, Australian culture separate from its original intent as a mercantilist colony

Epidemiology in Higher Education: Scarlet Fever at Gettysburg College

Throughout the early 20th century, the relationship between higher education and the spread of epidemic disease evolved in the United States. Two notable epidemics of scarlet fever in 1915 and 1920 serve as a lens through which the larger roles of disease and higher education can be analyzed. By assessing the roles both the administration and the students played at Gettysburg College, then Pennsylvania College, historians can understand the process of combating health crises in the future. Although the Pennsylvania College scarlet fever epidemics of 1915 and 1920 impacted campus to a smaller extent than the 2020 COVID-19 pandemic, the documentation from the students and faculty demonstrate the development of a complex understanding of the roles of educational authority in response to health crises

Kansas Baseball, 1858-1941

Review of: Kansas Baseball, 1858–1941, by Mark E. Eberle

Redefining Gender Roles in Higher Education: Women at Gettysburg College during World War II

Throughout the early 20th century, the role of American women began to change. The U.S. entrance into World War II and resulting draft provided women at institutions of higher education the opportunity to develop their place on college campuses. Through analyzing yearbooks, student publications, and personal testimonies, the case of Gettysburg College provides a lens to better understand the changing dynamics on college campuses during the war years. Although men remained on the campus of Gettysburg College during the war years, the changing dynamics of the College, both academically and socially, allowed women the opportunity to increase not only their presence, but their leadership capabilities

On some numerical difficulties in integrating the equations for one-dimensional nonequilibrium nozzle flow

Numerical difficulties in integrating equations for one dimensional nonequilibrium nozzle flow of ga

Frequency multiplication in high-energy electron beams Semiannual progress report, 1 Apr. - 1 Oct. 1967

High energy electron beam studies dealing with nonlinear analysis of beam-plasma interactions, cyclotron harmonic instabilities, and frequency multiplicatio

Investigation of nonlinear interaction phenomena in the ionosphere

Ionospheric phenomena as thermal radiation noise, propagation of naturally occurring radio noise through ionosphere, and generation of very low frequency emission