排序方式: 共有36条查询结果,搜索用时 46 毫秒
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目的:比较传统玻璃蒸馏瓶蒸馏装置、二氧化硫测定仪、自动凯氏定氮仪3种仪器测定食品中二氧化硫的效果及适用性,为设备选型提供参考.方法:选取番薯干、咸菜、香菇干,分别用上述3种蒸馏装置测定样品中的二氧化硫含量,分析测定结果和过程控制.结果:使用3种不同蒸馏仪器测定结果无显著性差异,两次独立测定结果的绝对差值小于算术平均值的10%,回收率均在85%~95%.结论:二氧化硫测定仪自动化程度高,安全性高,基本可以替代传统玻璃蒸馏瓶蒸馏,实现大部分食品的批量检测,对于香菇干等蒸馏过程易倒吸食品,可采用自动凯氏定氮仪检测,提高实验的准确性和可靠性. 相似文献
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Juin-Jen Chang 《The Journal of economic education》2013,44(4):369-380
The authors present a pedagogical graphical exposition to illustrate the stabilizing effect of price target zones. Based on a textbook AD-AS apparatus, they find that authorities' commitment to defend a price target zone will affect the public's inflation expectations and, in turn, reduce actual inflation. They also find that, when the economy experiences supply shocks, the announcement that the monetary authorities intend to defend a price target zone will reduce the variability of domestic prices but raise the variability of domestic output relative to a free-price regime. However, when the economy experiences demand shocks, a price target zone tends to lower the variability of both domestic prices and out-put relative to a free-price regime. 相似文献
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《Journal of Comparative Economics》2022,50(3):652-667
We build a model that puts together crony capitalism, the hierarchy of the Chinese communist party-state, and the decision-making process inside the Party Center. We show that inefficient economic institutions create local corruption that raises realized productivity, while generating rents that flow along the party-state hierarchy up to the provincial level, threatening the Center’s control in potential crises. Although both stronger crisis control and higher economic performance help the Center’s goal to stay in power, we show that given a general fat-tailed risk of crisis, the Center will maximize crisis control at the expense of the economy when choosing its tolerance of local corruption. Power structure and corruption within the Center and reciprocal accountability between central and provincial leaders are also analyzed. Our analysis suggests conditions under which China’s communist regime will or will not deal with the existential threat presented by corruption. 相似文献
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保护电器在低压配电系统中占有重要地位。保护电器在使用过程中,其选择性是最为重要的。本文主要以低压智能断路器为讨论对象,介绍其是如何实现选择性保护的,并在过程中引出了智能脱扣器的概念,同时对常见的过电流脱扣器、欠电压脱扣器的工作原理和使用方法进行了探讨。 相似文献
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本文对智能电器的概念和构成进行了简要介绍,对智能电器在整体上有较为清晰的认识,其次,介绍了智能电器在使用过程中可能出现的问题。最后,针对这些问题进行了一系列的拆装维修的研究,最终使问题得以解决。 相似文献
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企业计量器具检定周期分析与探讨 总被引:1,自引:0,他引:1
根据企业计量器具检定周期评定中存在的问题 ,探讨评定合理的计量器具检定周期的方法。 相似文献
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本文则从质检部门源头监管质量的角度来研究分析整治假冒伪劣衡器的对策举措,以便使我国衡器行业能健康地向前发展。 相似文献