期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
MG400/985(940)-WD采煤机调高缸技术改造与应用
1
作者 王立新 张东思 《中国新技术新产品》 2009年第5期116-116,共1页
本文阐述了采煤机调高缸技术改造方案、并对改造前后的调高缸结构、工作原理及其应用情况进行了对比。改造后的调高缸经实际使用表明使用周期明显提高,减少了因频繁更换调高缸影响正常生产时间,降低了检修工人的劳动强度,为矿井安全生... 本文阐述了采煤机调高缸技术改造方案、并对改造前后的调高缸结构、工作原理及其应用情况进行了对比。改造后的调高缸经实际使用表明使用周期明显提高,减少了因频繁更换调高缸影响正常生产时间,降低了检修工人的劳动强度,为矿井安全生产创造了条件。 展开更多
关键词 采煤机 调高缸 供液结构 技术改造 提高效益
下载PDF
VASCULAR ARCHITECTURE OF THE HUMAN OPTIC CHIASMA AND BITEMPORAL HEMIANOPIA 被引量:7
2
作者 劳远秀 高桦 钟勇 《Chinese Medical Sciences Journal》 CAS CSCD 1994年第1期38-44,共7页
The blood supply system of the optic chiasma was studied in 85 fresh human specimens using various histological and anatomical methods. Computer image analysis and ultrastructural examinations of the microvessel in 58... The blood supply system of the optic chiasma was studied in 85 fresh human specimens using various histological and anatomical methods. Computer image analysis and ultrastructural examinations of the microvessel in 58fetal specimens were also conducted. The authors found that the medial portion of the chiasma is a weak point in the microcirculation network. This weak point is apt to be disturbed first and become ischemic. causing disorders of the crossing optic nerve fibers and resulting in characterestic bitemporal visual field defects. SEM studies showed no ultrastructural difference between the capillaries at the medial and lateral portions of the chiasma. It was concluded that: 1) No special artery supplies the median chiasma the weak point of microcirculation at the median chiasma is due to its relatively scanty capillary distribution; 2) 'lateral chiasma arteries' could provide a better blood supply to the lateral fibers and thus the nasal quadrantic visual field could be preserved in many late stages of visual field defect in sellar region tumors, 3) cases with pituitary microadenoma which is not sufficiently large to press the chiasma but involves bitemporal visual field defect are due to the tumor recieving “shunt-flow” (stealing blood) from the chiasma through the peri-infundibulum plexus. 展开更多
关键词 CHIASMA PITUITARY bitemporal hemianopia
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部