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矿物加工工程学科中,浮选是最为主要的选矿方法,浮选的依据是矿物与岩石的表面化学性质,人们可以人为改变矿物和岩石的表面化学实现矿物与岩石的浮选分离,化学在矿物加工工程学科中具有非常重要的地位。通过分析表明,无机化学、有机化学、物理化学是矿物加工工程学科本科生的必修课程。对于高层次人才培养的研究生,分析化学和更加深入的量子化学等的学习和教育是需要的。化学是矿物加工过程中的资源高效、综合、清洁利用的基础,也是废水循环利用、零排放、保护环境的重要手段。重视矿物加工工程学科的化学教育,提高学生的化学素养,对实现矿产资源开发利用的可持续发展和环境保护具有重要意义。 相似文献
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矿物加工这一专业不仅在矿业领域中占有重要的地位,还在环保、冶金等其他领域占有不可或缺的地位,它对我国经济建设与发展具有强有力的推动作用。为了满足新形势下社会对矿物加工专业人才的需要,高校需要对矿物加工专业教学进行改革与创新。因此,笔者从矿物加工专业的相关概念解析入手,对当前矿物加工专业教学中存在的问题进行了全面而深入的分析,并在此基础上全方位、深层次地研究了新形势下对矿物加工专业教学过程的要求,希望对提高新形势下矿物专业教学质量起到一定的促进作用。 相似文献
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以工程教育认证为基础,推动矿物加工工程专业本科教育的发展,建立以本科学生中心、基于项目的小班专业教学模式,面向全球,培养下一代矿物加工工程专业优秀人才。 相似文献
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Shailesh A. Shirali 《Resonance》2007,12(7):27-43
For non-negative integers k, n, let P
k
(n) denote the sum {fx27-1}. We show by two different means that if k ≥ 3 and odd, then n
2(n+1)2 iss a factor of the polynomial P
k
(n); and if k ≥ 2 and even, then n (n+1) (2n+1) is a factor of the polynomial P
k
(n). We also derive a relatively unknown result first obtained by Johann Faulhaber in the 17th century.
Shailesh Shirali has been at Rishi Valley School, Andhra Pradesh (Krishnamurti Foundation India) since the 1980’s. He has
a deep interest in teaching and writing about mathematics at the high school/post school levels, with particular emphasis
on problem solving and on historical aspects of the subject. He has been involved in the Mathematics Olympiad movement at
the national and international level for the past two decades. He is the author of several expository books and articles aimed
at interested high school students. 相似文献
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Aspects of the Reliability and Validity of School Inspection Judgements of Teaching Quality 总被引：1，自引：0，他引：1
Peter Matthews J. Roger Holmes Paul Vickers Bep Corporaal 《Educational Research and Evaluation》2013,19(2):167-188
This paper presents the results of the first study of aspects of the reliability and validity of judgements of teaching quality made by independent inspectors in the classrooms of primary and secondary schools in England. The study shows, in particular, that two trained inspectors, independently observing the same lesson, are likely to identify the same strengths and weaknesses in the teaching and to arrive at similar conclusions about its overall quality. The strengths and weaknesses identified reflect appropriate application of the evaluation criteria specified by the Office for Standards in Education (OFSTED), and the better the teaching is judged to be, the more the strengths outweigh the weaknesses. The agreement between inspectors reported here is comparable with that found by the Dutch Inspectorate in similar studies. Résumé Cet article présente les résultats d’une première étude anglaise sur la fiabilité et la validité des jugements émis sur la qualité de l’enseignement par des inspecteurs indépendants dans des classes d’école primaire et secondaire en Angleterre. Cette étude montre notamment que deux inspecteurs, formés à cette tâche, qui observent de façon indépendante la même leçon, vont probablement identifier les mêmes points forts et faibles de l’enseignement et parviendront à des conclusions semblables sur sa qualité d’ensemble. Les points forts et faibles qui sont identifiés reflètent l’application appropriée des critères d’évaluation définis par le Bureau pour les standards de l’enseignement (OFSTED). Plus l’enseignement est considéré comme bon, plus les points forts l’emportent sur les faibles. Le degré d’accord entre les inspecteurs décrit ici est comparable à celui qui a été mis en évidence dans des études du même type par des inspecteurs néerlandais. (Traduction: Liliane Jeanneret Clerc, IRDP, Neuchâtel / Suisse) 相似文献
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Gurprit S. Kindra 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1984,30(1):57-67
The present study attempts to shed light on the perceptions of business educators regarding the effectiveness of six methodologies in achieving Gagné's five learning outcomes. Results of this study empirically confirm the oft-stated contention that no one method is globally effective for the attainment of all objectives. Specifically, business games, traditional lecture, and case study methods are perceived to be most effective for the learning of application, knowledge acquisition, and analysis and application, respectively.
Zusammenfassung Die vorliegende Studie versucht, Erkenntnisse vonbusiness schools-Lehrern aufzuhellen hinsichtlich der Effektivität von sechs Methodologien, um Gagnés fünf Lernergebnisse zu erzielen. Resultate dieser Studie bestätigen empirisch die oft aufgestellte Behauptung, daß nicht nur eine Methode zur Erreichung aller Ziele global wirksam sei. Insbesondere Unternehmensplanspiele, traditionelle Vorlesung und Fallstudienmethoden werden als höchst effektiv empfunden zum Lernen der Nutzanwendung, zum Wissenserwerb, zur Analyse beziehungsweise Nutzanwendung.
Résumé Cette étude cherche à éclairer la perception des formateurs en matière de commerce de l'efficacité des six méthodologies à réaliser les cinq objectifs d'apprentissage identifiés par Gagné. Les résultats de cette étude confirment empiriquement la controverse soulevée bien souvent qu'aucune méthode n'est globalement efficace pour la réalisation de tous les objectifs. En particulier, les jeux professionnels, le cours traditionnel et les méthodes d'étude de cas sont perçus comme étant des plus efficaces pour l'apprentissage de l'application, l'acquisition des connaissances, l'analyse et l'application, respectivement.相似文献
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BackgroundChild maltreatment has been associated with the development of various mental health problems, including the development of personality disorders.ObjectiveThis study investigated the association between child maltreatment and personality disorder symptoms in 125 women who transitioned out of residential care.MethodThe Child Trauma Questionnaire was used for the measurement of child maltreatment, and Personality disorder symptoms were measured using the Personality Diagnostic Questionnaire 4 + . The Psychological Distress Index was used to control for symptoms of distress.ResultsA Stepwise regression analysis showed that the majority of the associations were found between self-reported emotional abuse, neglect and personality disorder symptoms. Emotional abuse was significantly related to the Paranoid (β = .42, p<0.001), Schizoid (β = .18, p <0.05), Schizotypal (β = .18, p<0.05), Histrionic (β = .22, p<0.05), Avoidant (β = .31, p < .001), Dependent (β = 0.31, p < .001), Obsessive Compulsive (β = 0.29, p = .001), Passive Aggressive (β = 0.23, p<0.01) and the Depressive personality disorder (β = .38, p < .001). Emotional neglect was significantly associated to the Borderline Personality Disorder (β = .32, p<0.001) and the Paranoid Personality Disorder (β =-0.22, p<0.05).ConclusionsThe current study underlines the detrimental effects of childhood maltreatment, and in particular the effects of emotional abuse and neglect. 相似文献
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Antibacterial potency of methanol extracts of three green lower plants, Pneumatopteris afra, Platycerium bifurcatum and Nephrolepsis bisserata was determined using agar dilution method on clinical strains of Escherichia coli, Staphylococcus aureus, Klebsiella spp. and Salmomelia typhi. Antibacterial activities were observed at concentrations of 12.5, 25.0, 50.0 and 100.0 μg/ml. Their minimum inhibitory concentrations ranged from 12.5~100 μg/ml. Extracts of P. afra and P. bifurcatum were most active. Antibacterial activities observed with N. bisserata were less pronounced with no detectable activity at extract con-centrations of 12.5 and 25.0 μg/ml. E. coli, together with S. aureus appeared to be the most susceptible of the test bacteria while Klebsiella spp. was least sensitive. The significance of our findings is discussed. 相似文献
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Jesse L. Hawke Sally J. Wadsworth Richard K. Olson John C. DeFries 《Reading and writing》2007,20(1-2):13-25
To test the hypothesis that the etiology of reading difficulties may differ for males and females in more severely impaired
samples, reading performance data from monozygotic (MZ), same-sex dizygotic (DZss), and opposite-sex dizygotic (DZos) twin pairs were analyzed using a model-fitting implementation of the DeFries-Fulker (DF) model (Purcell & Sham, 2003, Behavior genetics, 33, 271–278). Five non-independent samples were selected using cut-offs of −1 (N = 737 pairs), −1.5 (N = 654), −2 (N = 468), −2.5 (N = 335), and −3 (N = 198) standard deviations (s) below the mean composite reading score of control twins. Male/female gender ratios for children
with reading difficulties were significantly higher than 1.0 for all five samples and increased as a function of severity
(viz., 1.15, 1.17, 1.40, 1.61, and 1.88, respectively). When the DF model was fit to the data, estimates of heritability (h
g2) and shared environmental influences (c
g2) were not significantly different for males and females in any of the groups. Consequently, the most parsimonious model that
provided a good fit to the data at all five levels of severity equated the heritabilities and shared environmental influences
for males and females, and fixed the DZos coefficient of genetic relatedness at 0.5. Thus, these results provide no evidence for a differential etiology of reading
difficulties as a function of gender in more severely impaired samples, and suggest that the same genetic and environmental
influences contribute to reading difficulties in males and females, irrespective of severity. 相似文献
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This quasi‐experimental study investigated the effects on 558 grades five and six students of three different teaching conditions: the classical model of conceptual change (for which cognitive conflict is considered as a precondition to the transformation of knowledge), the prevalence model of conceptual change (in which different conceptions can coexist, with one of them surpassing the others), and repetition of traditional teaching (that avoids cognitive conflicts and concentrates on the automatization of appropriate thought processes). These conditions were reduced to sequencing considerations, as classical model participants were first subjected to a possible cognitive conflict induced by a video, followed by another video about the targeted conceptions; prevalence model participants were subjected to the same videos but in the opposite chronological order; and repetition condition participants watched the “traditional teaching” video twice. Differences in accuracy and response times between our computerized and validated “sink/float” pretest and retest were analyzed. Results and interpretations confirm that cognitive conflicts are useful in teaching sequences that aim at producing conceptual changes. However, the major findings of this research suggest that such conflicts should not necessarily be triggered at the very beginning of teaching sequences, and therefore that the prevalence model might possibly be the preferable one to promote conceptual changes in real‐life school science teaching settings. Recommendations for teaching and research are formulated. Presented results, although statistically significant, sometimes show weak effects sizes, and therefore call for further research efforts. © 2015 Wiley Periodicals, Inc. J Res Sci Teach 52: 1082–1108, 2015. Cette recherche étudie l'effet de trois conditions expérimentales sur des élèves de 5e et 6e années du primaire: le modèle classique du changement conceptuel (selon lequel le conflit cognitif est considéré comme préalable à une transformation des connaissances), le modèle de prévalence conceptuelle (selon lequel différentes conceptions peuvent coexister, avec l'une d'elle qui prévaut sur les autres) et la répétition simple de l'enseignement (qui néglige de produire des conflits cognitifs et se concentre sur l'automatisation des procédés et informations qui mènent aux bonnes réponses). Ces conditions ont été réduites à des considérations de séquençage. Ainsi, les sujets de la condition classique ont d'abord été exposés à des informations présentées par vidéo et susceptible de produire un conflit cognitif, suivi par une autre vidéo présentant les conceptions scientifiques désirées; les sujets de la condition prévalence ont écouté les deux mêmes vidéos mais dans l'ordre inverse; et les sujets de la condition répétition ont vu deux fois la vidéo des conceptions scientifiques. Une analyse comparative des gains d'exactitude et de temps de réaction lors d'une tâche portant sur la flottabilité des corps a été effectuée. Les résultats et l'interprétation tendent à confirmer que les conflits cognitifs sont nécessaires aux changements conceptuels. Cependant, les résultats suggèrent également que les conflits n'ont pas nécessairement avantage à être provoqués en début de séquence et conséquemment que le modèle de prévalence serait possiblement celui qui aurait avantage à être utilisé en classe de science. Des recommandations pédagogiques sont formulées. Malgré des résultats clairement significatifs, les faibles magnitudes d'effets obtenues pour certaines mesures appellent à la prudence et à la poursuite des travaux. 相似文献