共查询到20条相似文献，搜索用时 536 毫秒
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以COD、总氰化物为指标,考察了Fenton试剂氧化法去除焦化废水中难降解有机物、氰化物的条件,并将自制的PFAS用于混凝处理,小试结果表明,经过Fenton试剂氧化-混凝技术深度处理的焦化废水,可达到辽宁省污水综合排放标准要求,方法具有实用性。 相似文献
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粉煤灰基混凝剂深度处理焦化废水技术 总被引：1，自引：0，他引：1
以COD、色度、总氰化物为指标,研究了用粉煤灰基混凝剂深度处理焦化废水的可行性,结果表明,该混凝剂具有吸附、混凝等多种作用,处理效果明显优于聚合硫酸铁,处理后的废水可达到国家排放标准。 相似文献
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采用高温和酸分别对粉煤灰进行改性,对比了改性后的粉煤灰对焦化废水深度处理的效果,确定了最佳工艺条件。结果表明,焦化废水COD135~170mg/L,NH3-N 96~135mg/L,体积150mL,pH值5,改性粉煤灰投加量25g,粒径100~160目,吸附时间60min,石灰量0.25g,高温改性粉煤灰对焦化废水COD和氨氮的去除率分别达到了85.2%和89.6%,而酸改性粉煤灰对焦化废水COD和氨氮的去除效果劣于高温改性粉煤灰,去除率分别为78.3%和82.7%。 相似文献
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《西安文理学院学报》2015,(1)
综述了无机复合絮凝剂在焦化废水处理中的应用情况.无机复合絮凝剂在焦化废水处理中主要集中应用在预处理和深度处理阶段,研究多从絮凝剂投加量、废水p H值、絮凝时间及搅拌速度等方面入手,侧重于单因素对焦化废水处理效果的影响,缺少对絮凝剂制备工艺的优化及各因素间的交互影响研究.文章在阐述国内外已有研究成果基础上,从絮凝剂制备工艺、因素间的交互作用方面展望焦化废水处理中无机复合絮凝剂应用研究方向和前景. 相似文献
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讨论pH值和投药量对聚合硫酸铁处理焦化废水的影响,确定最佳pH值和投药量.研究结果表明,处理后废水中NH3 -N、COD、酚等主要污染物指标均降低,效果良好. 相似文献
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文章采用臭氧氧化法对焦化废水进行处理,研究反应时间、pH和温度3个不同的因素对焦化废水可生化性的影响．结果表明：在臭氧发生量一定的情况下,在反应时间为20min,pH为9,温度为常温时,焦化废水的可生化性可以提高到0.300以上． 相似文献
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Thomas R. Koballa 《科学教学研究杂志》1984,21(6):659-668
Tested was the effect of a one-sided and two-sided persuasive message on the attitudes toward energy conservation of 85 preservice elementary teachers categorized as developmentally or nondevelopmentally advanced with respect to the topic of the message. The study addressed the following questions: (1) Are one-sided and two-sided systematically designed communications more effective in persuading nondevelopmentally advanced and developmentally advanced persons, respectively? (2) Do positive attitude gains between pre- and posttests, if any, dissipate within four weeks following the treatment? The important finding was that the two-sided communication was more effective than the one-sided communication regardless of subjects' level of developmental advancement when attitude change is measured immediately following the treatment. Secondly, positive attitude change dissipated four weeks after exposure to the two-sided communication for developmentally and nondevelopmentally advanced subjects, alike. Thirdly, while the attitudes of nondevelopmentally and developmentally advanced subjects exposed to the one-sided communication did not change immediately after exposure, the nondevelopmentally advanced subjects exhibited a positive shift in attitude four weeks following the presentation of the communication. 相似文献
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常建军 《宁波教育学院学报》2014,(1):6-10
先进典型教育是我国思想政治教育的重要方法,在历史与现实中发挥了巨大的作用。随着社会的发展,各种社会思潮传播,价值观日趋多元,信息技术应用日益广泛,群众对先进典型的认识更加深刻与全面。与此同时,对先进典型的解构成为部分青年对待先进典型的方式,消极的解构严重伤害了先进典型的价值,降低了先进典型的影响力、启发性。对先进典型的科学重建是增强先进典型教育实效性的必然选择。 相似文献
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2005年GRE委员会提出的新的GRE常规考试,将更强调与研究工作紧密相关的复杂推理能力和高级理解能力,将采用更先进网络技术,更有效、更公平地考查考生能力,这将进一步保证GRE考试在保障研究生生源质量上发挥独特的作用。通过介绍和分析GRE考试改革后的特点,从中得出我国在今后改革研究生入学考试时值得借鉴的经验。 相似文献
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文青云 《南京师范大学文学院学报》2006,(4):10-14
庄子哲学要比人们通常所认为的现实得多。对庄子来说,知与行是不可分割的。知之源于行丝毫不亚于行之遵循知。只有“有用”的知识才有价值,而知识要有用,就必须像变动不居的现实一样,灵动如流水。此外,个体的“知”的层次也在变,这一点直接关乎“行”是否奏效。对一个处于“知”的较高层次的人而言是恰当的行动路线,对处于“知”的较低层次的人则有可能是灾难性的。当代有关实践知识和专门技能的研究可以补证许多传统的神秘主义的解释,帮助我们正确理解庄子的无意识、直觉以及与变化为一的知行理想。 相似文献
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Teacher behaviour and student outcomes: Suggestions for research on teacher training and professional development 总被引：1，自引：0，他引：1
The study reported here examines whether teaching skills included in the dynamic model of educational effectiveness can be grouped into types of teacher behaviour and whether these types are related with different student outcome measures. The data stem from a study which was conducted in order to test the validity of the dynamic model. Results reveal that teaching skills can be grouped into five types of teacher behaviour which are discerned in a distinctive way and move gradually from skills associated with direct teaching to more advanced skills concerned with new teaching approaches and differentiation of teaching. Teachers exercising more advanced types of behaviour have better student outcomes. Suggestions for research on teacher education and professional development are drawn. 相似文献
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Learners enter the classroom with informal ideas (alternative conceptions) about scientific phenomena; these ideas affect how the corresponding scientific explanations are learned. In addition, studentsÕ epistemological beliefs concerning learning influence achievement. This study investigated the effects of a constructivist versus objectivist learning environment on college studentsÕ conceptual change, using a computer simulation of the human cardiovascular system as an instructional tool. This study also investigated the interaction between constructivist versus objectivist learning situations and the studentsÕ epistemological beliefs. The constructivist approach resulted in significantly greater conceptual change than the objectivist approach for 2 of 6 commonly held alternative conceptions; the other 4 of 6 areas showed no significant differences for treatment group. More important, however, the treatment interacted significantly with epistemological beliefs. Individuals with more advanced epistemological beliefs learned more with a constructivist treatment; individuals with less developmentally advanced beliefs learned more with an objectivist treatment. © 1998 John Wiley & Sons, Inc. J Res Sci Teach 35: 145–160, 1998. 相似文献
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通过对我国高校体育俱乐部现状的思考，并借鉴国外先进的经验，探索性提出了我国高校体育俱乐部应向社会开放及加强社会软控制等观点，为我国高校体育俱乐部改革提供依据。 相似文献
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Suhkyung Shin 《Interactive Learning Environments》2016,24(8):2032-2047
This study investigates how scaffolding type and learners’ epistemological beliefs influence ill-structured problem solving. The independent variables in this study include the type of scaffolding (task-supported, self-monitoring) and the student's epistemological belief level (more advanced, less advanced). The dependent variables include three components of problem-solving skill (problem representation, solution development, monitoring and evaluation). The two-way multivariate analysis of variance results reveal that students in the self-monitoring scaffolding group earned higher scores on problem representation and solution development than those in the task-supported scaffolding group. Students with more advanced epistemological beliefs also earned higher scores on solution development and monitoring and evaluation than did those with less advanced epistemological beliefs. In addition, a significant interaction was found between scaffolding type and epistemological belief level. These findings suggest that students can benefit from self-monitoring scaffolding in web-based problem solving and that different types of scaffolding should be provided according to the student's epistemological belief level. 相似文献
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大学生先进典型是社会主义核心价值观的有效载体,通过大学生先进典型教育实践活动,有助于集聚大学生思想政治教育的正能量。对大学生先进典型的研究应该更加深入实际、接地气,从学生中来,到学生中去,唯有这样才更有意义和时效,为加强和改进大学生先进典型教育提供借鉴。 相似文献
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《The Journal of educational research》2012,105(5):274-286
Abstract The author examined advanced mathematics achievement with 1,839 students from 162 schools. The data were obtained from the Third International Mathematics and Science Study Population 3 cohort; the author used hierarchical (multilevel) linear modeling to examine student- and school-level factors. Even within the advanced mathematics cohort, gender and economic disparities existed, but the magnitude of these disparities varied from school to school. Average parent education was observed to be associated with the magnitude of the coefficient for attitude toward mathematics on achievement. The more a student believed that success in mathematics was caused by natural ability, the higher the score on the test. Finally, resources, school size, and average parent education were significantly associated with school mean achievement in advanced mathematics. 相似文献