共查询到19条相似文献，搜索用时 341 毫秒
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华东师大一附中课外化学小组 《化学教学》1981,(4)
作为催化剂的活性镍粉,经过长期使用后,由于杂质的“中毒”现象,因活性降低而失去催化效能,变成了镍泥下脚,常因难以处理而作为废料,这样不但会使环境污染,并在经济上造成一定损失。因此,我们化学小组的十几位同学,将医工院附属工厂赠送的镍泥下脚进行了回收和提纯的试验,经过近两个月的反复实践,终于通过两种不同的途径,提纯后能得到完全自燃的镍粉,并作了氢催化效能的试验,结果良好,现将我们实验的步骤分述如下: 相似文献
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对一种含镍钼矿提取镍的条件和工艺进行研究.探讨了酸度,液固比,温度及时间等因素对镍浸出率的影响,控制合适的工艺条件,镍的回收率大于95%. 相似文献
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介绍了一种从含镍电镀废液中回收硫酸镍的新方法，通过两步沉淀、硫酸溶解、蒸发结晶，废液中的镍以硫酸镍的形式被回收。所得产品纯度高，回收方法简单。 相似文献
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介绍了一种从含镍电镀废液中回收硫酸镍的新方法，通过两步沉淀、硫酸溶解，蒸发结晶，废液中的镍以硫酸镍的形式被回收。所得产品纯度高，回收方法简单。 相似文献
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采用化学手段,对硫酸复盐法回收钕铁硼废料时产生的含铁废水进行处理。通过对钕铁硼废料进行充分的焙烧,使铁、钕均转化为氧化物。再经酸解、溶解后趁热过滤,通过结晶,重结晶,烘干得到硫酸亚铁盐。实验中得到的硫酸亚铁纯度达到了81.35%。该实验方式不仅可得到钕铁硼磁体废料中的稀土金属（氧化物）,同时回收了大量的含铁盐,而且还减少了对环境的污染,是对硫酸复盐法的补充,因此在实际生产中会得到良好的应用。 相似文献
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庄玉贵 《福建师大福清分校学报》2008,(5):20-25
回顾了国内外近几年含镍电极材料的赝电容器的研究进展;比较了镍的氢氧化物、氧化物等的制备方法、工艺条件,以及它们的掺杂改性和与多孔性载体复合等,作为赝电容器材料的特点;指出了提高材料的比电容、比功率、比能量等超级电容器主要性能指标的一些建议。 相似文献
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在煤系硫铁矿处理含镍废水过程中,废水的pH值、反应时间、粒度、加入量、温度、搅拌等对Ni2+的去除率影响较大。在煤系硫铁矿中加入不同配比的还原铁粉进行改性处理,结果表明煤系硫铁矿与还原铁粉的比例为100∶10,加热温度为200℃时,对镍的去除率明显提高。 相似文献
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郑秀丽 《浙江工贸职业技术学院学报》2011,11(2):44-46,88
通过对温州鞋类厂家的调查,本文介绍了一种能够完全替代手工操作的鞋中底自动修边设备的应用和研究情况。主要分析了利用当前先进的自动化生产设备结合原有手工操作的流程研制出解决当前鞋业企业所面临的生产效率低下、废品率高、可重复性差等问题,实现良好的经济效益。 相似文献
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Zhen Heng Zhou 《大连大学学报》1995,(3)
本文考虑到自动化加工对断屑效果及切屑形态的特殊要求,从切屑材料本构关系出发,在产生连续带状屑的条件下,根据所建立新的切屑折断准则,设计了一种卷屑槽型,使切屑能顺利进入之,并进行第二次变形而折断。 相似文献
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网络技术应用于固定资产管理,提高了资产管理的效率,使管理流程更加规范。在基于校园网的高校固定资产管理模式下,介绍了仪器设备报废的操作过程,并对报废仪器设备的处置方式进行了探讨。 相似文献
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Amanda L. Nolen 《Educational Psychology Review》2009,21(3):279-289
Educational psychology as a field of study has encountered a lack of distinction by overlapping with other fields of study
or disciplines. Consequently, educational psychology continues to have difficulty claiming jurisdiction over bodies of research
knowledge and has been encroached upon by other more crystallized disciplines. The purpose of this study is to examine the
research literature published across top-ranked educational psychology journals to identify the common ground and current
trends in research content and to identify those areas that can be reclaimed by the discipline as its own. Overall, 758 articles
published in six journals from January 2003 through December 2007 were included in this study. A combination of statistics-based
and linguistics-based methods were used to determine how frequently terms occur in the data and establishing a semantic network
which created a probabilistic analysis of the co-occurrence of terms resulting in a constellation of terms showing the relationship
and relative importance of the categories of terms. The results showed a consistency of research categories suggesting that
in spite of reports to the contrary, there is a collective agreement among educational psychologists demonstrated by the empirical
research in the field. 相似文献
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何农 《金华职业技术学院学报》2007,7(5):64-66
为了探明我省高职院校师资队伍建设是否适应高职教育发展的状况,我们对全省高职院校的师资队伍建设举措状况展开了调查,通过对高职院校人事部门发放问卷,并对回收问卷进行统计分析,就我省高职院校师资队伍建设提出了一些建议. 相似文献
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V. J. Hall 《Journal of Further & Higher Education》2017,41(2):120-132
A small-scale action research project was used to consider the policy and rhetoric surrounding development of the ‘expert learner’ and how this might be further explored to provide opportunities for learners to have greater direct involvement in reflection and discussion with teachers. The research was based within a further education setting, using participants from an ‘HE in FE’ curriculum area: teacher education. It sought to explore how involving students as partners in the peer observation process might be used to engage with student voice and enhance the teaching and learning experience for all involved. To evaluate the creation, sharing and development of teaching and learning that might be generated in such circumstances, the research used two theoretical frameworks to analyse the data: communities of practice and ecological learning systems. This article reviews the literature around these two frameworks and critically reflects on the influences of these approaches in communities of teaching and learning. Analysis of interviews, and the interactions and dialogue contained within these, revealed something else happening within these connections. As such, it considers the opportunities facilitated in this context and how development of a newly-devised continuum of practice may be used to enable professional dialogue to enhance student–teacher interactions. 相似文献
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李洁 《安徽广播电视大学学报》2012,(2):31-34
考察了我国城市生活垃圾分类的法律现状,分析了发达国家城市生活垃圾分类的先进法制,探讨如何从循环经济的思路科学地解决垃圾分类问题,提出了完善我国城市生活垃圾分类法律的建议。 相似文献