Resistivity and Hall measurements of thermoelectric materials

Instrumentation setup measures resistivity values between .000003 and 100,000 ohm-cm and Hall values between 0.2 and 10 billion cc/coulomb, with an absolute error of less than 5 percent. Results of measurement are given for 8 electrical brush specimens and pure silver

American Education Through a Chinese Lens

This June, a group of faculty members from Gettysburg College and K-12 teachers from York and Adams Counties travelled to China for four weeks of intensive cultural and educational exchange. This Gettysburg Fulbright Group Project Abroad in China studied the cultural and historical foundations of the Chinese educational system, as well as how this system is changing. Participants studied the larger policy context of the Chinese system and how those policies play out in the classroom. (excerpt

Finding Relevance, Competence, and Enjoyment: The Development of Domain Identification and Interest in First-Year Science Majors

The purpose of this qualitative study was to examine how first-year college students perceive their development of domain identification with, and interest in, their prospective science major during their initial year of college. Four themes emerged from the coding and analysis of interviews with eight first-year science students: Self-Definition in Flux, Feeling Competent, Expressing Interest through Enjoyment, and Relevant to Me. These themes were mainly consistent with the current model of domain identification (Osborne & Jones, 2011) but differ from the current model of interest development (Hidi & Renninger, 2006). Theoretical and practical implications are included for faculty and advisors working with first-year science students

Recent origin of low trabecular bone density in modern humans

Humans are unique, compared with our closest living relatives (chimpanzees) and early fossil hominins, in having an enlarged body size and lower limb joint surfaces in combination with a relatively gracile skeleton (i.e., lower bone mass for our body size). Some analyses have observed that in at least a few anatomical regions modern humans today appear to have relatively low trabecular density, but little is known about how that density varies throughout the human skeleton and across species or how and when the present trabecular patterns emerged over the course of human evolution. Here, we test the hypotheses that (i) recent modern humans have low trabecular density throughout the upper and lower limbs compared with other primate taxa and (ii) the reduction in trabecular density first occurred in early Homo erectus, consistent with the shift toward a modern human locomotor anatomy, or more recently in concert with diaphyseal gracilization in Holocene humans. We used peripheral quantitative CT and microtomography to measure trabecular bone of limb epiphyses (long bone articular ends) in modern humans and chimpanzees and in fossil hominins attributed to Australopithecus africanus, Paranthropus robustus/early Homo from Swartkrans, Homo neanderthalensis, and early Homo sapiens. Results show that only recent modern humans have low trabecular density throughout the limb joints. Extinct hominins, including pre-Holocene Homo sapiens, retain the high levels seen in nonhuman primates. Thus, the low trabecular density of the recent modern human skeleton evolved late in our evolutionary history, potentially resulting from increased sedentism and reliance on technological and cultural innovations

Becoming a Scientist: Using First-Year Undergraduate Science Courses to Promote Identification with Science Disciplines

In this qualitative study, we examined how two professors (a physicist and biochemist) of first year college students perceived their students’ development of identification in biochemistry or physics and how they actively supported this development. The professors described students who entered college with different levels of domain identification and different expectations for their college science experience depending upon whether they were in a biochemistry or physics major. Although neither professor was familiar with research related to the concept of domain identification, their beliefs about their students’ identification and academic support strategies generally aligned with the Osborne and Jones (2011) model of academic identification

The Revolving Door of Education: Teacher Turnover and Retention amongst the Graduates of a Liberal Arts Teacher Education Program

In the United States, elementary and secondary education teachers comprise 4% of the entire civilian workforce (Ingersoll, 2001). The composition of that 4% is changing because of teacher turnover. According to recent statistics, 46% of teachers leave the classroom within the first five years of teaching and 9.5% of teachers leave the classroom within their first year (Rinke, 2014; Riggs, 2013; Zheng & Zeller, 2016). This study is designed to examine the teaching experiences of graduates of one teacher education program and the potential differences between graduates who stay in teaching and those who leave. Throughout this study, the guiding questions were: How many Gettysburg College Teacher Education Program Alumni, 1985 - 2008, are still teaching in the classroom at a primary or secondary level? Why did some alumni leave the classroom at a primary or secondary level and why did some alumni never teach? How does the data from the Gettysburg College Teacher Education Program alumni correspond with the previous scholarship on teacher turnover and retention? When looked at from the perspective of an individual post-secondary institution, the individual stories of the alumni emerge and so does the complexity of teacher turnover and retention in America, which is not always reflected in studies conducting on a state or national level