共查询到20条相似文献,搜索用时 93 毫秒
1.
初中生化学问题解决中元认知水平的高低直接影响着其化学问题解决的质量和效率。如何通过提高初中生化学问题解决中的元认知能力,进而提高其问题解决的能力,是化学教育研究的一个重要课题。本文通过实验对这一问题进行了研究,实验结果表明: (1)初中生在化学问题解决的过程中对自己的自信心进行评估,能提高其化学学习成绩。 (2)化学问题解决中元认知能力的训练对于不同层次的初中生的效果是不一样,其中中等生的效果最明显。 (3)自我提问单的使用是提高初中生化学问题解决中的元认知能力的有效方法之一。 相似文献
2.
3.
4.
5.
6.
本文吸收了国外有关元认知及问题解决的理论 ,在剖析化学解题的事例基础上得出元认知的重要作用 ,并在教学过程中提出了培养学生自我监控能力的具体措施。 相似文献
7.
本文吸收了国外有关元认知及问题解决的理论,在剖析化学解题的事例基础上得出元认知的重要作用,并在教学过程中提出了培养学生自我监控能力的具体措施. 相似文献
8.
元认知在化学解题中的作用及其培养 总被引:1,自引:0,他引:1
本文吸收了国外有关元认知及问题解决的理论,在剖析化学解题的事例基础上得出元认知的重要作用,并在教学过程中提出了培养学生自我监控能力的具体措施。 相似文献
9.
学生元认知能力的高低进接影响其学习的质量和效率.教学实验表明在高中化学教学中应用元认知教学能提高学生的元认知能力、有效地控制学习分化、提高学生的化学学业成绩.实验说明,在教学中提高学生的元认知能力,对中等生、学困生的学习成绩的提高,效果特别显著. 相似文献
10.
科学探究的自主性特点决定了元认知在化学科学探究中的重要作用。本文分析了元认知在科学探究中的渗透并探索性地提出了在科学探究中培养学生元认知能力的策略。 相似文献
11.
V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1989,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988. 相似文献
12.
利用手持技术改进测定乙醇分子结构实验 总被引:1,自引:0,他引:1
利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。 相似文献
13.
14.
由于石化行业的生产需要,其材质的使用具有多样性和广泛性,经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识,根据光谱仪的测试能力及标样的采集,实现了一个或几个元素测量范围的扩展,并对其测量的影响因素进行了研究。 相似文献
15.
16.
Effect of the Method of Modification of Zeolite X on Selectivity of Catalytic Methylation of Toluene
Voloshyna Yu. G. Pertko O. P. Patrylak L. K. 《Theoretical and Experimental Chemistry》2019,54(6):395-400
Theoretical and Experimental Chemistry - The effect of the method of modification of catalysts based on zeolite X by cesium and magnesium cations (ion exchange and impregnation) on the selectivity... 相似文献
17.
Influence of viscosity of medium on processes of oxygen quenching of excited states of mesoporphyrin
E. I. Kapinus V. A. Ganzha B. M. Dzhagarov E. I. Sagun V. B. Pavlenko 《Theoretical and Experimental Chemistry》1989,25(2):146-151
The oxygen quenching rate constants for singlet and triplet excited states of the dimethyl ester of mesoporphyrin IX increase with decreasing viscosity of the medium and reach a maximum at a viscosity of approximately 0.4 mPa·sec, after which the rate constants begin to decrease. The drop in rate constant with increasing fluidity of the medium may be related to a nonequilibrium character of the elementary act in the interaction of the reactants in the solvent cage. In viscous media such as isopropyl alcohol, isobutyl alcohol, and isoamyl alcohol, the reaction radius is greater than the sum of the radii of the reacting particles. The long-range character of these processes is due to the relatively weak dependence of the quenching probability on distance.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 2, pp. 161–167, March–April, 1989. 相似文献
18.
The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted
indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator
model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was
established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing
analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997. 相似文献
19.
Kopranenkov V. N. Makarova E. A. Dashkevich S. N. Luk'yanets E. A. 《Chemistry of Heterocyclic Compounds》1982,18(11):1218-1218
Chemistry of Heterocyclic Compounds - 相似文献