On the construction of transitional filter nomographs

The construction of nomographs for transitional classical filters is described. Gain functions of classical filters are related to filter requirements resulting in a formulation for the general gain nomograph. The transitional filters that are products of approximating polynomials are incorporated into the general gain nomograph resulting in transitional filter nomographs that are sums of the individual nomographs. Nomographs for transitional filters using alternative forms where poles are interpolated are also considered. The resulting nomographs allow for quick optimization of transitional filter frequency response in many cases. Design examples are submitted and discussed. The proposed transitional filter nomographs provide the engineer with increased insight into the selection of classical transitional filters with optimum frequency response.     

Novice use of qualitative versus quantitative problem solving in electrostatics

Problem-solving behavior of six novice subjects attempting to solve an electrostatics problem in second-semester calculus-based college physics was observed and recorded. Five of the subjects were characterized as “A” or “B” students and one subject as a “D” student in introductory college physics. Although the A or B subjects were able to arrive at a “correct” solution to the problem, they exhibited major misconceptions about the problem situation as well as minimal qualitative understanding of the problem situation. The A or B subjects were successful in identifying, either from memory or written notes, equations relevant to electrostatics, whereas the D subject was not. The implication of this study is that current instruction in introductory calculus-based college physics and the students' previous science learnings place a premium on acquisition of correct quantitative solutions at the expense of qualitative understanding of physics problem situations.     

Dynamic Forces in Educational Development: A long-run comparative view of France and Germany in the 19th and 20th centuries

Since World War II, much of the economic growth literature has focused on the contribution of human capital to national development. Two assumptions have remained largely unexamined: (i) economic stability results from economic growth, and (ii) investments in human capital result in economic growth ( ceteris paribus ). This paper questions this education-stability link by examining longitudinal data from France and Germany across 170 years. Results indicate that human capital investment prior to 1945 was a response to economic growth. It is only since 1945 that human capital investments appear to drive economic growth. A shift since 1973 leads to doubts as to whether the post-war human capital-driven growth is being sustained. The results raise the question of whether human capital investment might not be as much a consequence as it is a cause of economic stability in the course of time.     

Listening harder: Queer archive and biography

This article emerges from a wider study on bicultural film archiving practice. It focuses on Jonathan Dennis as a subject of (my) archiving, and as a distinctive archivist himself in relation to a specific archive at a particular moment. Dennis practice differed significantly from North American and European conventions contemporaneous with his life work. The charismatic founding director of Ngā Taonga Sound & Vision (formerly The New Zealand Film Archive) Jonathan Dennis (1953–2002) became a conduit for tensions and debates during the 1981–2002 period in relation to indigenous and non indigenous presentation of (film) archival materials. This resulted in a film archive and curatorship practice which differed significantly from that of the North American and European archives he originally sought to emulate. As a Pākehā (non Māori/indigenous New Zealander) with a strong sense of social justice he argued for an awareness of geographical location and cultural context in his work. He supported a philosophical shift in archival practice, by engaging indigenous peoples in developing creative and innovative exhibitions and programmes from the 1980s period until his death.

Note: From 1988 the official name for the New Zealand Film Archive was Ngā Kaitiaki o ngā Taonga Whitiāhua (Guardians of the Treasured Images of Light). Since August 2014 the institution is called Ngā Taonga Sound & Vision, New Zealand Archive of Film, Television and Sound Ngā Taonga Whitiāhua Me Ngā Taonga Kōrero to acknowledge the acquisition of the state-owned Television NZ Archive and Sound Archives from Radio NZ. For brevity’s sake the Archive is referred to throughout as NTSV (Ngā Taonga Sound & Vision).

Key: NTSV PP JD refers to the NTSV Personal Papers of Jonathan Dennis (uncatalogued at time of writing).     

The health and wellbeing of international students at an Australian university

A representative sample of undergraduate and postgraduate international students at a large Australian university (n=979, 64% females) completed a mail-back survey of their health and wellbeing. Most students evaluated their current and previous physical and mental health positively. Health-related risk practices such as unprotected sexual activity, drug use, smoking and gambling, were reported by few students. There was little change in health or risk behaviours since coming to Australia and few changes that were health compromising. Few demographic or situational variables, including age and gender, had a significant impact on students' wellbeing. This study has revealed that few international students find the experience of studying in an overseas country detrimental to their wellbeing. Nevertheless, for those students who encounter difficulties or are at increased risk of health-compromising outcomes, we must ensure better delivery of health promotion education, and access to, and use of, available counselling and health services.

Using the United States Census Data to Introduce Differential Equations

Abstract

This article describes a method for using the United States Census data to open a differential equations course. The question of finding a model for the United States population data gives students a first experience with creating a model using differential equations, and also understanding derivatives, what they mean, and how to calculate them in the context of real data. This model-building start motivates further exploration in many of the standard differential equations topics: the method of separation of variables, slope fields, autonomous equations, equilibria, and stability.