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精密润滑冷却系统在铜锯切生产中的应用 被引量:1
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作者 孙之甫 《有色设备》 2007年第2期33-34,49,共3页
对比介绍了在铜合金锯切加工中的精密润滑冷却系统与传统乳液喷淋冷却系统的工作原理和技术性能,分析乳液喷淋系统中存在的问题及原因,以及采用精密润滑冷却系统后所取得的经济效益和环境效益。
关键词 润滑剂 锯刃 喷油机 喷嘴 油气管
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锯切机列的节能技术改造
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作者 赵洪鹏 刘爱冬 《有色冶金节能》 2009年第2期30-34,共5页
本文介绍了PLC、变频器和精密润滑冷却系统在锯切机列变频传动控制系统和锯切润滑冷却系统改造中的成功应用,着重分析了系统改造控制方案和软硬件结构的设计思想及改造后的效果,以及采用精密润滑冷却系统后所取得的经济和环境效益。
关键词 节能减排 变频传动 PLC 润滑剂 锯刃
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On the beginning of the Japanese Upper Paleolithic:A review of recent archaeological and anthropological evidence
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作者 Hiroyuki SATO Kazuki MORISAKI 《人类学学报》 CSSCI CSCD 北大核心 2024年第3期470-487,共18页
The beginning of the Japanese Upper Paleolithic has mainly been examined using two major models:the Middle Paleolithic evolutionary model within the archipelago and the continental Upper Paleolithic diffusion/migratio... The beginning of the Japanese Upper Paleolithic has mainly been examined using two major models:the Middle Paleolithic evolutionary model within the archipelago and the continental Upper Paleolithic diffusion/migration model.However,recent archeological data from Japan and nearby countries are challenging such simple models.This paper critically reviews previous chronology of the Japanese Paleolithic,including possible Lower and Middle Paleolithic(LP/MP),and attempts to show an alternative model of the beginning of the Japanese Upper Paleolithic.This paper suggests several possible specimens of LP/MP and recommends further geoarchaeological investigation to understand the reliability and cultural relationship between possible LP/MP specimens and the Early Upper Paleolithic(EUP).The start of the Japanese EUP is presently characterized by a flake industry with trapezoids and denticulates around 39-37 kaBP cal on Paleo-Honshu Island,which has partial resemblance with contemporary assemblages in China and the Korean Peninsula,although trapezoids are endemic only to the Japanese EUP and may have derived from the ancestral lithic tradition.Blade technology appeared earliest on Central Paleo-Honshu Island,about 1000 years later than the earliest flake technology.Although blade technology may have originated from the elongated flake technology of the previous period,the sudden simultaneous emergence implies that it diffused from the Korean Peninsula.This paper proposes that blade technology from the Korean Peninsula arrived on the northeastern Paleo-Honshu Island,including the Japan Sea coastal region of western Honshu,rather than the southwest,where flake technology long prospered,due to differences in ecological settings and adaptation strategies between the two regions. 展开更多
关键词 Japanese Archipelago Early Upper Paleolithic migration route TRAPEZOID denticulate blade technology
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