共查询到19条相似文献，搜索用时 187 毫秒
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黄桂萍 《赣南师范学院学报》2011,32(3):100-103
实验改进后,减少了清洗、烘干及冷却样品管的实验操作环节;装样长度可比原来或多或少(9.5~10.5 cm);一种试样固定用一支样品管进行实验.实验结果与理论值基本相符,比改进前误差小.改进后可大大地缩短实验时间,减少实验用品和降低实验费用,且减少了对实验室、环境的影响.在实验教学中反复应用,效果较好,值得推广. 相似文献
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应用微型化学实验方法对基础化学实验中《氧化还原反应》实验进行改进,结果表明:改进后的实验,仪器装置显著微缩,试剂用量大幅节省,实验时间大为减少,操作更为简便,具有较好的教学功能和教学效果. 相似文献
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王海波 《中学生数理化(高中版)》2013,(9):10
本文从四个方面浅谈初中化学实验中的环境保护教育:1.在化学实验教学中渗透环保知识教育;2.严格规范实验操作,减少不必要废弃物;3.改进化学实验及仪器装备,减少污染物产生;4.妥善处理实验过程中废物,变废为宝. 相似文献
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"DNA的粗提取与鉴定"实验操作方法的改进 总被引：2，自引：0，他引：2
本文就DNA提取过程中几点操作方法进行了改进,红细胞破裂充分、用量减少;减少了一次"过滤";合理的控制"搅拌"力度和时间;实验结果明显改进、提高. 相似文献
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阐述实现高校化学基础实验绿色化教学改革的重要性,提出实现实验绿色化的可行性改进措施,以期达到减少有害物质对环境的污染,实现化学实验绿色化的目标. 相似文献
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铜络合电镀废水的石灰—次氯酸钠氧化处理工艺初探 总被引：1，自引：0，他引：1
王伟洲 《晋城职业技术学院学报》2010,3(6):47-49
采用次氯酸钠络合解离—碱性沉淀法对含柠檬酸络合铜离子废水进行处理,考察了pH、次氯酸钠用量、以及反应时间对该方法处理络合铜离子废水结果的影响。结果表明,在体系pH=13,次氯酸钠溶液用量达到4%,反应时间120min的条件下废水中的铜离子可下降到0.2mg.L-1左右,低于国家工业废水排放标准。 相似文献
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Work sampling, an industrial technique, enables a supervisor to estimate the percent of time a worker spends on a particular activity. In the office situation studied here, it was found that the same amount of work presently produced could be accomplished by a staff reduced by 23% from the present level. This determination was made in less than five hours by the observer, yet a savings of over $9,000 could be realized from these efforts in a single year. Periodic campus-wide use of this technique could result in even more substantial savings for an institution.The research reported on was the subject of a pilot study report in which John Fornof was most helpfully an original participant. The helpful critique of Dr. Robert C. Judd, Professor of Operations Analysis at the University of Toledo, is gratefully acknowledged. 相似文献
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扶庆权 《南京晓庄学院学报》2011,27(3):34-36
对五种不同原料肉配比生产的西式火腿的感官性状和质构特性进行了研究.结果表明,感官评定结果和质构仪测定结果具有一致性,不同原料肉配比生产的西式火腿的硬度、弹性和咀嚼性存在显著差异,内聚性无显著变化;增加鸡肉含量可以提高西式火腿的硬度,适当增加鸡皮含量可以提高西式火腿的弹性,合理的原料肉配比可以提高西式火腿的弹性和咀嚼性.扶庆权扶庆权 相似文献
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以L-脯氨酸离子液为催化剂,对乙酰乙酸乙酯和乙二醇合成苹果酯的催化工艺进行了系统研究.考察了酯醇比、催化剂用量、反应时间、带水剂种类和用量及催化剂重复使用等因素对酯化率的影响.结果表明,n（乙酰乙酸乙酯）∶n（乙二醇）=1.0∶1.4,催化剂用量为2.0 g/mol乙酰乙酸乙酯,带水剂环己烷为40 mL,110℃下反应3.5 h,苹果酯收率达到88.9%.反应结束后,通过简单的萃取操作,可使催化剂回收和重复使用.循环使用4次,催化剂的催化活性无明显改变. 相似文献
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微型化学实验的研究与应用已有20多年,它的特点就是使用微型仪器,并节约药品。我们探讨了微型滴定中指示剂用量对实验结果的影响,结果显示：微型滴定指示剂用量为常规实验用量的1/5~1/10时,实验结果依然可靠。 相似文献
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目的:通过端粒酶的数量变化来探讨瑞香狼毒提取物对肺癌细胞NCI-H446[H446]的抗肿瘤作用。方法:体外培养肺癌细胞NCI-H446[H446]细胞株,以不同浓度的瑞香狼毒提取物作用24h后,用荧光标记的方法定量检测端粒酶。结果:瑞香狼毒提取物作用人肺癌细胞提取物NCI-H446[H446]后,端粒酶的数量明显减少并呈现与剂量的正相关性。结论:瑞香狼毒提取物对肺癌细胞NCI-H446[H446]具有明显的抗肿瘤作用。 相似文献
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在绿色化学思想指导下,将小量-半微量实验方法运用于无机元素性质实验,结合实验教学实际,探讨了P区元素中卤素、硫的含氧酸盐、硫化物和铅的难溶盐等性质实验的试剂用量.结果显示,小量-半微量实验的试剂用量可降至常规用量的1/2~1/6,可节约实验开支,提高实验效率,减少环境污染,有利于学生树立绿色化学理念,增强环保意识. 相似文献
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试行有机合成实验微型化,试剂用量可减至常量的1/10,所用仪器规格要与试剂用量相对应.实践证明,此项改革还可减少环境污染,以及有利于培养学生规范化操作. 相似文献
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Six experiments on learning in honeybees were prompted by the possibility that results previously attributed to a difference in amount of reward (20- versus 5-μl drops of sucrose solution presented on colored targets) might be due at least in part to a difference in delay of reward attendant on greater difficulty in locating the 5-μ1 drops. Substantial reduction in the diameter of the targets, which was designed to facilitate location of the drops, impaired discrimination of the colors, perhaps because their salience was reduced in the process (Experiment 3). White dots used to mark the location of the drops on larger targets also impaired discrimination of the colors, which presumably were overshadowed by the dots (Experiments 1, 2, and 4). That the dots did not serve merely to equate delay but were themselves discriminated was demonstrated in Experiment 5, which produced as well the first indication of an effect of amount of reward uncontaminated by the possibility of differential delay: Animals trained with a 5-μl drop on a dotted target of one color and a drop of the same size on an undotted target of a second color preferred the dotted target, but animals trained with a 5-μl drop on a dotted target of one color and a 20-μl drop on an undotted target of a second color preferred the undotted target. In Experiment 6, with odors substituted for the colors on the assumption that they were less likely to be overshadowed by the dots, what could be interpreted as a pure amount effect was found again. Aside from their relevance to questions about the role of amount of reward, the results have some interesting implications for the theory of discriminative learning in honeybees. 相似文献