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基于颗粒级配的尾砂料浆管输模式判据与输砂效率计算模型研究
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作者 廉柏栋 乔登攀 +5 位作者 杨天雨 王俊 李勇明 郑聪 高博 龙赣 《有色金属(矿山部分)》 2024年第5期47-57,67,共12页
目的:以云南某锡矿选矿厂排放的尾砂为对象,通过试验研究与数值模拟分析尾砂料浆管输模式与输砂效率的影响因素。方法:通过水筛试验测得尾砂级配分布规律,以及料浆流变试验测得料浆流变特性,并结合ANSYS-FLUENT对料浆管输模型模拟计算... 目的:以云南某锡矿选矿厂排放的尾砂为对象,通过试验研究与数值模拟分析尾砂料浆管输模式与输砂效率的影响因素。方法:通过水筛试验测得尾砂级配分布规律,以及料浆流变试验测得料浆流变特性,并结合ANSYS-FLUENT对料浆管输模型模拟计算。结论:对比分析Wasp等判据不足,提出了基于颗粒级配的管输模式新判据,并结合级配模型与流变参数计算了输砂效率,结果与实测值的误差绝对值在5%以内,表明了新判据合理,同时构建了输砂效率计算新模型。意义:研究内容为尾砂料浆管输模式提供了新判据,可为相似情况的矿山尾砂料浆管输应用提供一定的参考价值。 展开更多
关键词 尾砂料浆 管输模式 砂效率 底床层 载体层 数值模拟
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美国天然气管网发展与管输定价机制及启示 被引量:6
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作者 申洪亮 方博涛 《中国矿业》 北大核心 2020年第10期57-65,共9页
随着天然气体制改革不断深化,中国天然气进入市场化发展的关键时期。美国是当前全球市场化程度最高、发展最成熟的天然气市场。通过大量调研,回顾美国天然气管网发展、市场化演变及管输费率改革历程,分析“两部制”管输定价模式,对推进... 随着天然气体制改革不断深化,中国天然气进入市场化发展的关键时期。美国是当前全球市场化程度最高、发展最成熟的天然气市场。通过大量调研,回顾美国天然气管网发展、市场化演变及管输费率改革历程,分析“两部制”管输定价模式,对推进中国天然气行业市场化进程、制定符合国情的“两部制”费率方法具有重要借鉴意义。研究结果表明,天然气市场化的演变是一个漫长的过程,完善的基础设施建设、成规模的二级交易市场、健全的天然气市场监管体系、符合国情的管输定价模式等都是重要条件。对于我国推行“两部制”管输定价模式而言,需要科学合理地划分预定费与使用费,分阶段推进费率改革;建立管输费率动态监管调控机制;研究按运距确定管输费率的方案。 展开更多
关键词 天然气市场化 天然气管网 两部制 管输定价模式 中国 美国
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Management of Foreign Market Entry: A Study of Czech Companies
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作者 Sairka Zapletalova 《Chinese Business Review》 2014年第11期707-716,共10页
Internationalization of company activities is the necessity of the development for majority of entrepreneurial subjects in the Czech Republic. Internationalization of entrepreneurial activities becomes a tool of busin... Internationalization of company activities is the necessity of the development for majority of entrepreneurial subjects in the Czech Republic. Internationalization of entrepreneurial activities becomes a tool of business competitiveness. Selecting the right foreign entry mode is an important decision, which demands a lot of resources and thorough planning. The factors influencing company's choice of entry mode are divided into two main groups subsuming--external and internal factors. External factors consist of determinants regarding the company's environment while the intemal ones are determined by the company's specific factors. The opening of new markets such as in the Czech Republic has created the potential for small and medium-size enterprise (SME) expansion and investment. The objective of this paper is to present an application of the entry modes of the selected Czech entrepreneurial subjects. The companies included in the study are those that have undertaken internationalization activities and are incorporated in the Czech Republic. There were a total of 297 enterprises that participated in the research. The research method was an oral questioning and the main instrument was a questionnaire. A relatively low degree of Czech companies that have undergone intemationalization has resulted in the dominance of the least advanced forms of internationalization expansion, mainly exports with a small share of more advanced forms of foreign direct investments and a very low level of forms of international cooperation. Czech companies are in decision about the choosing the foreign entry mode influenced by the many factors. The greatest influence on the choice of foreign entry mode has entry mode variables. Entry mode variables constitute variables assessment characteristics of particular entry mode. 展开更多
关键词 foreign market entry modes internationalization process foreign markets
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