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21.
K. F. MARTIN 《European Journal of Engineering Education》1986,11(4):451-457
CAE has enabled vibrational problems, which were regarded as intractable 20 years ago, to be solvable by students using computational support. The paper describes a problem set to final year undergraduates which concerns the torsional vibrational response of a three degrees of freedom system which is subjected simultaneously to three different arbitrarily varying torques. The solution involves the use of standard library routines for matrix multiplication and eigensolutions, a Runge-Kutta routine to solve a second order differential equation and general competence in writing software. 相似文献
22.
MARTIN THRUPP 《比较教育学》1998,34(2):195-209
This article examines how New Zealand's Education Review Office (ERO) and England's Office for Standards in Education (OFSTED) attempt to construct school failure as the clear responsibility of schools in order to gain ideological power as agents of accountability. These 'politics of blame' are contested in both settings by an alternative 'contextual' claim which seeks to take account of broader social and political constraints on schools. It is argued that whereas New Zealand academics have been distrustful of the ERO's agenda, English school effectiveness and school improvement researchers have often provided support for OFSTED's politics of blame. However this relationship represents a double-edged sword for OFSTED because some school effectiveness/school improvement researchers also partly support the contextual claim. The article concludes that the politics of blame and their contestation will continue to be important in these settings and elsewhere. 相似文献
23.
The differences among the four education systems of the UK are often perceived as a nuisance by comparative researchers. This paper argues that they are also an opportunity. It describes the four systems and summarises their similarities and differences. It then presents five reasons for giving 'home international' comparisons a more prominent role in comparative research. These are, respectively: their potential contribution to theoretical debates; specific differences among the four systems, which touch on core problems of educational research; the practical value of home international comparisons; their potential for policy learning; and the relative ease of conducting them. 相似文献
24.
Manuel TORAL IBAEZ Margarita CARU Miguel A.HERRERA Luis GONZALEZ Luis M.MARTIN Jorge MIRANDA Rafael M.NAVARRO-CERRILLO 《Journal of Zhejiang University. Science. B》2009,10(2)
A protocol of polymerase chain reaction-random amplified polymorphic DNAs (PCR-RAPDs) was established to analyse the gene diversity and genotype identification for clones of Sequoia sempervirens (D.Don) Endl.in Chile.Ten (out of 34) clones from introduction trial located in Voipir-Viilarrica,Chile,were studied.The PCR-RAPDs technique and a modified hexadecyltrimethylammonium bromide (CTAB) protocol were used for genomic DNA extraction.The PCR tests were carried out employing 10-mer random primers.The amplification products were detected by electrophoresis in agarose gels.Forty nine polymorphic bands were obtained with the selected primers (BG04,BF07,BF 12,BF13,and BF 14) and were ordered according to their molecular size.The genetic similarity between samples was calculated by the Jaccard index and a dendrogram was constructed using a cluster analysis of unweighted pair group method using arithmetic averages (UPGMA).Of the primers tested,5 (out of 60) RAPD primers were selected for their reproducibility and high polymorphism.A total of 49 polymorphic RAPD bands were detected out of 252 bands.The genetic similarity analysis demonstrates an extensive genetic variability between the tested clones and the dendrogram depicts the genetic relationships among the clones,suggesting a geographic relationship.The results indicate that the RAPD markers permitted the identification of the assayed clones,although they are derived from the same geographic origin. 相似文献
25.
The coronal and sagittal plane leg movements of 24 experienced male cyclists were assessed using video analysis while cycling on a Kingcycle windload simulator. The cyclists were grouped into those with a history of injury and an asymptomatic group on the basis of self-reported injury status. The ages, cycling experience, competition distances and competition speeds of the two groups were compared using Student's t-test. No significant differences (P?<0.05) were found for any of these variables. The maximum and minimum shank adduction, shank adduction velocities, knee flexion and ankle dorsiflexion values were also compared using Student's t-test. Significant differences were found at the point of maximum adduction (1.9°; P?=?0.019) and minimum dorsiflexion (4.9°; P?=?0.014). These differences indicated more dorsiflexion and greater abduction on the part of the symptomatic cyclists, supporting previous research that found that cyclists with a history of injury differ from those without a history of injury in the coronal plane leg movement patterns they adopt. Also, the most extreme medial position of the knee relative to the ankle occurred during knee extension. This supports the potential injury mechanism proposed by Francis (1986), which had previously only been examined using coronal plane kinematics. 相似文献
26.
ANNE L. CUMMINGS ERNEST T. HALLBERG JACK MARTIN ALAN SLEMON BRYAN HIEBERT 《Counselor Education & Supervision》1990,30(2):120-134
Conceptualizations of novice and experienced counselors are examined to determine how they view client problems and change in counseling. 相似文献
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PETER KOLB MARTIN RICKLI WALTER SCHAUFELBERGER 《European Journal of Engineering Education》1993,18(3):239-247
Summary Minitools are software tools that have been especially designed and implemented for use in education and on small industrial problems. They offer limited capabilities if compared to full-grown commercial systems but are much easier to learn and to use. Three such programs are introduced in this paper: DESolver for differential equation solving; Frequency for frequency response analysis and design; and BDE Sim for simulation and frequency response analysis from block diagrams. BlockSim, which is more a tool for implementation than a minitool, is also presented briefly. The four programs run on Macintosh and IBM compatible PCs. All programs are in the public domain; on the IBM PC a GEM desktop is needed to run them. 相似文献