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We describe a recent project that explored the use of interactive computer software for teaching Einstein's special theory of relativity to secondary school studients. Our approach couples results from recent cognitive science research with modern techniques for using computers to help students visualize and experiment with otherwise inaccessible phenomena. One the products of this research is RelLab, a computer-based exploratory tool for constructing gedanken, or thought experiments involving physical systems in relative motion. We will describe our efforts in designing and testing this software for affecting change in students' concepts of space and time. Relativity is ideally suited for such a study because understanding it requires a radical reconceptualization of these quantities.Advanced Physics from an Elementary Viewpoint, NSF grant MDR-9016417. 相似文献
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Paul Horwitz Alina von Davier John Chamberlain Al Koon Jessica Andrews Cynthia McIntyre 《Community College Journal of Research & Practice》2017,41(6):341-343
ABSTRACTThe Teaching Teamwork Project is using an online simulated electronic circuit, running on multiple computers, to assess students’ abilities to work together as a team. We pose problems that must be tackled collaboratively, and log students’ actions as they attempt to solve them. Team members are isolated from one another and can communicate only through an online chat channel, but modifications to the circuit made by any team member, insofar as they alter the behavior of the circuit, can affect measurements made by the others. We log all relevant student actions, including calculations (using an online calculator), measurements (using an online multimeter), inter-student communications, and alterations made by the students to the circuit itself. Automated analysis of the resulting data sheds light on the problem-solving strategy of each team, sometimes with surprising results. 相似文献
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Facing the loss of the last generation of Holocaust survivors, progeny of survivors have begun to tattoo their ancestors’ Auschwitz numbers on their own bodies. We investigate the rhetoricity of progenic tattooing through semiotic, affective, and pedagogical registers. We argue that shifting conditions of discourse across time alter decorum about public memory of the Holocaust. Further, the progenic practice, constituting a distinct form of trauma tattoo, enacts a mode of postmemory through a resignification of the original sign that makes visible the intergenerational trauma of the Holocaust. 相似文献
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DeSena AD Murphy RA Douglas-Palumberi H Blau G Kelly B Horwitz SM Kaufman J 《Child abuse & neglect》2005,29(6):627-643
OBJECTIVE: To evaluate the SAFE Homes (SH) program, a short-term group care program for children between 3 and 12 years of age who enter care for the first time. The program aims to improve case outcomes by consolidating resources to facilitate assessment and treatment planning. METHODS: The 1-year outcomes of 342 children who received SAFE Home services and 342 matched foster care (FC) control children were compared. The 684 subjects used in this report were selected from a larger pool of 909 subjects using propensity score matching to control for hidden bias in treatment group assignment. We hypothesized that SAFE Homes would result in greater continuity of care for children (e.g., fewer placements, more placements with siblings and in towns of origin), identification of more relatives for substitute care when needed, reduced use of high-cost restrictive care settings (e.g., residential, inpatient), and reduced rates of re-abuse through earlier detection and provision of services to meet child and family treatment needs. RESULTS: Prior to the initiation of the SAFE Homes program, 75% of the children who entered care in the State experienced three or more placements in the first year. The outcomes of both the SH and FC cases were significantly improved over pre-SAFE Home State statistics. The FC group, however, had comparable or better outcomes on most variables examined. In addition, the total cost for out-of-home care for the children in FC was significantly less, despite the fact that the two groups spent similar amounts of time in care (average time in care: 7 months). This finding held when the total placement cost was calculated using the State reimbursement rate of 206.00 US dollars per day for SAFE Home care (SH: 20,851 US dollars +/- 24,231 US dollars; FC: 8,441 US dollars +/- 21,126 US dollars, p < .001), and a conservative SAFE Home program fee of 85.00 US dollars per day that only considered the child care and custodial staffing costs uniquely associated with the program (SH: 13,314 US dollars +/- 21,718 US dollars; FC: 8,441 US dollars +/-21,126 US dollars, p < .001). CONCLUSION: Improvements in outcomes related to continuity of care can be attained through staff training. The SAFE Home model of care is not cost-effective for first-time placements. 相似文献
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Fluid and electrolyte balance in elite male football (soccer) players training in a cool environment
There are few data in the published literature on sweat loss and drinking behaviour in athletes training in a cool environment. Sweat loss and fluid intake were measured in 17 first-team members of an elite soccer team training for 90 min in a cool (5°C, 81% relative humidity) environment. Sweat loss was assessed from the change in body mass after correction for the volume of fluid consumed. Sweat electrolyte content was measured from absorbent patches applied at four skin sites. Mean (?± s) sweat loss during training was 1.69?±?0.45 l (range 1.06?-?2.65 l). Mean fluid intake during training was 423?±?215 ml (44?-?951 ml). There was no apparent relationship between the amount of sweat lost and the volume of fluid consumed during training (r 2 = 0.013, P = 0.665). Mean sweat sodium concentration was 42.5?±?13.0 mmol?·?l?1 and mean sweat potassium concentration was 4.2?±?1.0 mmol?·?l?1. Total salt (NaCl) loss during training was 4.3?±?1.8 g. The sweat loss data are similar to those recorded in elite players undergoing a similar training session in warm environments, but the volume of fluid ingested is less. 相似文献
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Shedid SM Saada HN Eltahawy NA Hammad AS 《Indian journal of clinical biochemistry : IJCB》2018,33(3):314-321
Radiation induced brain damage is associated with impairment of mitochondrial functions, variations in the level of neurotransmitters, and oxidative stress. Mitochondrial function is closely linked to the level of neurotransmitters since the precursors are supplied by the Kreb’s cycle intermediates. The objective of this study was to evaluate the influence of pantothenic acid, an essential component in the synthesis of Coenzyme A (CoA), on the activity of the Krebs cycle enzymes, isocitrate dehydrogenase (IDH), α-ketoglutarate dehydrogenase (α-KGDH), and succinate dehydrogenase (SDH); the level of aspartic, glutamic and GABA; the activity of transaminases, and oxidative stress, in the cerebrum of γ-irradiated rats. Pantothenic acid (26 mg/Kg) was orally administered to the rats, 2 h after irradiation and during the following 5 days. Animals were sacrificed the 7th day post-irradiation. The exposure of male albino rats to γ-rays (5 Gy) has triggered oxidative stress notified by a significant elevation in the level of malondialdehyde (MDA), an end product of lipid peroxidation, associated to a significant decrease in the content of phospholipids, and the antioxidant compound glutathione (GSH). The activity of IDH, α-KGDH, and SDH, has significantly decreased, while the level of aspartic, glutamic and GABA has significantly increased. In parallel to these changes, the activity of alanine and aspartate transaminase has significantly increased, compared to their values in the control rats. Pantothenic acid treatment, has significantly attenuated oxidative stress; enhanced the activity of IDH, α-KGDH, and SDH; minimized the increase in the level of amino acids and the activity of transaminases, compared to their values in the cerebrum of irradiated rats. In conclusion, pantothenic acid could improve the level of neurotransmitters amino acids, which depends on the enzymatic activities of Krebs cycle and linked to oxidative stress. 相似文献
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Andrew Deacon Jacob Jaftha David Horwitz 《British journal of educational technology : journal of the Council for Educational Technology》2004,35(2):223-234
Powerful applications such as Microsoft Office's Excel and Word are widely used to perform common tasks in the workplace and in education. Scripting within these applications allows unanticipated user requirements to be addressed. We show that such extensibility, intended to support office automation‐type applications, is well suited to the creation of learning activities and learning environments. We have developed a range of tutorial activities using Excel and Word in introductory mathematics, writing and economics courses. These tutorials have the dual purpose of teaching academic concepts and practical computer literacy skills. The software architecture of our learning environment includes a database‐supported back‐end to automatically record students’ responses, which allows for greater control over what students do. Additionally, this allows one to automate common procedures to improve usability and feedback automation to support learning. We have been applying our ideas for the last six years and currently 1,500 students are using the environment. We suggest that this pragmatic solution can provide a high degree of interactivity and flexibility in a range of learning contexts that represents a cost‐effective alternative for use alongside traditional approaches. 相似文献
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Praxedes SM de la Rosa 《Asia Pacific Education Review》2005,6(2):170-178
Excellence in teaching has always been a demanding and absorbing concern in institutions of higher learning. Earlier studies,
which are numerous, have often dealt with the measurement of teacher qualities but have largely failed to explain the phenomenon
of excellence in practice. This study focused on the outstanding professional teachers’ candid revelations of their subjective
experiences of becoming and being excellent in their craft. Findings of the study indicated that love is the touchstone of
excellence in teaching: that is, loving the students, loving knowledge and loving the teaching process. 相似文献