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我国几种磁选设备的发展和应用 被引量:18
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作者 梁治安 夏青 伍红强 《金属矿山》 CAS 北大核心 2017年第2期128-134,共7页
介绍了国内几种应用较广泛的典型磁选设备,归纳总结了不同设备的分选方式、性能及应用领域。干式磁选机具有构造简单、运行成本低、投资少和节能环保等优势,但存在分选工艺粗放,无法实现精细化分选,金属损失率高等不足;随着新型磁性材... 介绍了国内几种应用较广泛的典型磁选设备,归纳总结了不同设备的分选方式、性能及应用领域。干式磁选机具有构造简单、运行成本低、投资少和节能环保等优势,但存在分选工艺粗放,无法实现精细化分选,金属损失率高等不足;随着新型磁性材料的发展,永磁筒式磁选机发展已较为成熟,不断向大型化方向发展;磁聚机、磁选柱、磁场筛选机作为精选设备,均能大幅提高精矿品位,但其设备价格高、处理量小、占地面积大等问题有待解决;立环脉动高梯度磁选机对细粒级弱磁性矿物分选具有处理能力大、分选效率高和选别指标好等优势,但也存在能耗高、结构复杂和设备价格高等缺点。 展开更多
关键词 磁选设备 分选方式 性能 发展
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宁夏甘城子小产区梅鹿辄葡萄酒品质提升的研究 被引量:3
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作者 白稳红 黄小晶 +2 位作者 秦义 宋育阳 刘延琳 《中国酿造》 CAS 北大核心 2016年第10期41-45,共5页
为提升甘城子小产区梅鹿辄葡萄酒的品质,针对影响其质量的四个关键点(分选方式、发酵容器、冷浸渍、循环方式)进行研究。以宁夏甘城子小产区梅鹿辄葡萄为原料,分别进行粒选及穗选,随后对原料进行96 h冷浸渍处理,分别在5 m^3小型发酵罐、... 为提升甘城子小产区梅鹿辄葡萄酒的品质,针对影响其质量的四个关键点(分选方式、发酵容器、冷浸渍、循环方式)进行研究。以宁夏甘城子小产区梅鹿辄葡萄为原料,分别进行粒选及穗选,随后对原料进行96 h冷浸渍处理,分别在5 m^3小型发酵罐、50 m^3直式发酵罐和65 m^3嘉尼米德发酵罐中进行酒精发酵,并分别辅助人工压帽、酒泵循环、气体压帽3种循环方式。结果表明,粒选可使原料糖酸比提高至53.8;冷浸渍可提升葡萄酒的色度和单宁含量;5 m^3发酵罐配合人工压帽可增加葡萄酒单宁的细腻感。原料经粒选、96 h的冷浸渍后,在5 m^3发酵罐中进行发酵,并辅助人工压帽,按照上述工艺生产出的梅鹿辄葡萄酒果香浓郁,单宁口感细腻,感官评分为(90.3±5.2)分。 展开更多
关键词 梅鹿辄葡萄酒 分选方式 冷浸渍 循环方式
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Influence of land use characteristics and trip attributes on commuting mode choice: a case of Nanjing 被引量:5
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作者 刘志伟 邓卫 季彦婕 《Journal of Southeast University(English Edition)》 EI CAS 2014年第1期107-112,共6页
The effects of socio-demographics, land use characteristics and trip attributes on the commute mode choice are studied with a nested logit (NL) model. Based on the random utility maximum theory, the NL model is form... The effects of socio-demographics, land use characteristics and trip attributes on the commute mode choice are studied with a nested logit (NL) model. Based on the random utility maximum theory, the NL model is formulated. The analysis is carried out in the main area of Nanjing. Direct and cross elasticities are calculated to analyze the effects of travel time and travel cost on the selection of travel mode choice. The results reveal that the non-motorized travel modes are more attractive in the areas with higher housing and employment accessibility and car owners are found to be more likely to commute to work by car. The bus and subway choice probabilities are more sensitive to changes in travel times than to changes in travel costs. In conclusion, a comprehensive public transit system and effective integration of land use and transportation policies help to relieve the traffic congestion levels caused by the increasing urban sprawl. 展开更多
关键词 traffic engineering land use travel mode choice nested logit model elasticity analysis
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准格尔矿区煤系高岭岩的资源回收及销售市场分析 被引量:1
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作者 张顺红 柳骁 《露天采矿技术》 CAS 2016年第B12期40-43,共4页
针对准格尔矿区煤系高岭岩的特点,研究了资源的回收和分选方式,预测了2017年造纸、油漆、塑料等行业对高岭岩产品的需求数量,提出了准能公司煤系高岭岩资源的分选和销售建议。
关键词 煤系高岭岩 准格尔矿区 分选方式 销售预测
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Tour Level Mode Choice Analysis of Madison Area in Wisconsin
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作者 Zhang Miao Cheng Yang 《Chinese Journal of Population,Resources and Environment》 北大核心 2008年第3期90-92,共3页
This study is to investigate what factors and how they affect tours (trip chains) behavior. The key issue is the understanding and definition of tour and tour level mode. Also, these definitions should fit for the dat... This study is to investigate what factors and how they affect tours (trip chains) behavior. The key issue is the understanding and definition of tour and tour level mode. Also, these definitions should fit for the data. A semi-home based tour definition is stated, and a competing mode based tour mode is defined. Based on the definition, this study used Madison Area Data from National Household Survey to estimate a MNL structured model. It is found that travel distance could be a positive factor for car mode. Meanwhile, the number of trips is also a positive factor for choosing car. 展开更多
关键词 trip chaining multi-nominal logit model mode choice travel behavior tour analysis
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Suburban travel mode choice considering transit accessibility of stops in public transport
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作者 Gao Yueer Cui jie +2 位作者 Cheng Jing Ding Ming Wang Scarlett Sijia 《Journal of Southeast University(English Edition)》 EI CAS 2021年第2期222-226,共5页
To analyze the influence of the transit accessibility of stops on the travel mode choices of suburban residents,the number of the lines passing by the stops within an accessible range of the resident origin and destin... To analyze the influence of the transit accessibility of stops on the travel mode choices of suburban residents,the number of the lines passing by the stops within an accessible range of the resident origin and destination(OD)points and the average waiting time are used as the indexes of the transit accessibility of stops.Due to the correlation between travel time and accessible range,the transit accessibility of stops is contrasted as piecewise variables constrained by travel time.Taking the Jimei District of Xiamen,China,as an example,a binary logistic regression model of the suburban travel mode choice is constructed.The results show that it is necessary to construct transit accessibility of stops as piecewise variables.With a higher transit accessibility of stops,more residents will choose public transport.The choice of the travel mode is correlated with family attributes and personal characteristics.Morning and evening peak hours and travel distance have little effect on the choice of travel mode.Compared with the travel in urban areas,residents often chose public transport for travel within the suburbs.This research provides a basis for encouraging public transportation priority policies and decision making for transport planners in the suburbs. 展开更多
关键词 transit accessibility of stops piecewise variable travel time mode choice SUBURBS
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