Scaling in the Lattice Gas Model

A good quality scaling of the cluster size distributions is obtained for the Lattice Gas Model using the Fisher's ansatz for the scaling function. This scaling identifies a pseudo-critical line in the phase diagram of the model that spans the whole (subcritical to supercritical) density range. The independent cluster hypothesis of the Fisher approach is shown to describe correctly the thermodynamics of the lattice only far away from the critical point.Comment: 4 pages, 3 figure

Addressing and Overcoming Barriers to Youth Civic Engagement

Youth civic engagement—and particularly youth participation in properly designed youth programs—has indisputably favorable outcomes for the young people involved (Saito, 2006; Pancer et al., 2002; Flanagan et al., 2002). This research reviews the wide-ranging literature available on youth civic engagement in urban communities. Using content analysis, we identify organizations involved in youth engagement as well as barriers faced by organizations engaged in this policy arena. Our research also identifies 15 broad types of barriers that organizations seeking to encourage youth civic engagement encounter in building and delivering successful youth engagement programs. In addition, we discuss the emergent social and political barriers that are prevalent among the identified service organizations. Ultimately, we argue that such barriers are important influences in determining the ability of organizations to effectively serve their clients

Representational task formats and problem solving strategies in kinematics and work

Previous studies have reported that students employed different problem solving approaches when presented with the same task structured with different representations. In this study, we explored and compared students’ strategies as they attempted tasks from two topical areas, kinematics and work. Our participants were 19 engineering students taking a calculus-based physics course. The tasks were presented in linguistic, graphical, and symbolic forms and requested either a qualitative solution or a value. The analysis was both qualitative and quantitative in nature focusing principally on the characteristics of the strategies employed as well as the underlying reasoning for their applications. A comparison was also made for the same student’s approach with the same kind of representation across the two topics. Additionally, the participants’ overall strategies across the different tasks, in each topic, were considered. On the whole, we found that the students prefer manipulating equations irrespective of the representational format of the task. They rarely recognized the applicability of a ‘‘qualitative’’ approach to solve the problem although they were aware of the concepts involved. Even when the students included visual representations in their solutions, they seldom used these representations in conjunction with the mathematical part of the problem. Additionally, the students were not consistent in their approach for interpreting and solving problems with the same kind of representation across the two topical areas. The representational format, level of prior knowledge, and familiarity with a topic appeared to influence their strategies, their written responses, and their ability to recognize qualitative ways to attempt a problem. The nature of the solution does not seem to impact the strategies employed to handle the problem

Isotopic composition of fragments in multifragmentation of very large nuclear systems: effects of the chemical equilibrium

Studies on the isospin of fragments resulting from the disassembly of highly excited large thermal-like nuclear emitting sources, formed in the ^{197}Au + ^{197}Au reaction at 35 MeV/nucleon beam energy, are presented. Two different decay systems (the quasiprojectile formed in midperipheral reactions and the unique source coming from the incomplete fusion of projectile and target in the most central collisions) were considered; these emitting sources have the same initial N/Z ratio and excitation energy (E^* ~= 5--6 MeV/nucleon), but different size. Their charge yields and isotopic content of the fragments show different distributions. It is observed that the neutron content of intermediate mass fragments increases with the size of the source. These evidences are consistent with chemical equilibrium reached in the systems. This fact is confirmed by the analysis with the statistical multifragmentation model.Comment: 9 pages, 4 ps figure

Statistical evolution of isotope composition of nuclear fragments

Calculations within the statistical multifragmentation model show that the neutron content of intermediate mass fragments can increase in the region of liquid-gas phase transition in finite nuclei. The model predicts also inhomogeneous distributions of fragments and their isospin in the freeze-out volume caused by an angular momentum and external long-range Coulomb field. These effects can take place in peripheral nucleus-nucleus collisions at intermediate energies and lead to neutron-rich isotopes produced in the midrapidity kinematic region.Comment: 14 pages with 4 figures. GSI preprint, Darmstadt, 200

Viscosity and thermal conductivity effects at first-order phase transitions in heavy-ion collisions

Effects of viscosity and thermal conductivity on the dynamics of first-order phase transitions are studied. The nuclear gas-liquid and hadron-quark transitions in heavy-ion collisions are considered. We demonstrate that at non-zero thermal conductivity, $\kappa \neq 0$, onset of spinodal instabilities occurs on an isothermal spinodal line, whereas for $\kappa =0$ instabilities take place at lower temperatures, on an adiabatic spinodal.Comment: invited talk at 6th International Workshop on Critical Point and Onset of Deconfinment (CPOD2010), Dubna, August 22-28, 201

Women in Public Administration in the United States: Leadership, Gender Stereotypes, and Bias

In the public and private sectors, women continue to address multiple hurdles despite diversity and equity initiatives. Women have made tremendous strides in the workforce but are still a minority in leadership positions worldwide in multiple sectors, including nonprofit, corporate, government, medicine, education, military, and religion. In the United States women represent 60% of bachelor’s degrees earned at universities and outpace men in master’s and doctoral programs. However, a significant body of research illustrates that women’s upward mobility has been concentrated in middle management positions. Women hold 52% of all management and professional roles in the U.S. job market, including physicians and attorneys. Yet women fall behind in representation in senior level positions. In the legal profession, for example, women represent 45% of associates but only 22.7% are partners. In medicine, women represent 40% of all physicians and surgeons but only 16% are permanent medical school deans. In academia, women surpass men in doctorates but only 32% are full professors. Furthermore, only 5% of chief executive officers (CEOs) in Fortune 500 companies and 19% of the board members in companies included in Standard & Poor’s (S&P) Composite 1500 Index are women. Progress is even more elusive for women of color despite making up 38.3% of the female civilian labor force. Only two women of color are Fortune 500 CEOs and only 4.7% of women are executive or senior level official managers in S&P 1500 companies. There are more women in leadership positions in the public sector than in the private sector. In 2014, 43.5% of women between the ages of 23 and 34 were managers at public companies, compared to 26% in similar positions in the private sector. In 2018, 127 women were elected to the U.S. Congress and 47 of those serving in 2018 were women of color. In addition, the first Native American woman, first Muslim woman, and Congress’s youngest woman were elected in that year. However, there is still progress to be made to close the gap, especially in senior-level positions. The significance of these statistics is staggering and confirms the need for attention. The percentage of women holding leadership positions in the public and private sectors, especially in business and education, has grown steadily in the past decade. However, subtle barriers like bias and stereotypes unfavorably encumber women’s career progression and are often used to explain the lack of women in leadership positions

A SWOT model of the challenges and benefits of volunteer involvement in US non-profit organisations during times of fiscal stress

As a result of the current fiscal crisis, the US Federal Government is calling on non-profit organisations and communities across the country to contribute their service through volunteering. This study uses qualitative data retrieved from a purposive sample of New York City non-profit administrators to determine the challenges and benefits of volunteer involvement in US non-profit organisations during the economic downturn that began in 2008. Findings conclude that although US Federal Government initiatives, including $50 million of the American Recovery and Reinvestment Act allocated to the strengthening communities fund provided non-profits the opportunity to draw on an influx of a highly skilled pool of volunteers, many non-profits remain underfunded, understaffed and unequipped to make the most of those who are looking to serve