排序方式: 共有30条查询结果,搜索用时 15 毫秒
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Relation between total and exchangeable sodium in the body 总被引:1,自引:0,他引:1
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梁晓燕 《科技情报开发与经济》2004,14(6):214-215
通过与传统会计信息系统的比较,分析了计算机网络会计信息系统及网络财务所具有的特点,阐述了计算机网络会计信息系统在网络财务管理中所起的作用。 相似文献
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梁新文 《科技情报开发与经济》2004,14(6):185-186
给出了圆柱蜗杆及蜗轮轮齿在任意半径处弦齿厚计算的精确公式,采用了圆球法测量蜗轮直径方向的两齿间距,为了计算上的需要,引进了蜗轮弦齿厚计算斜齿轮的概念和斜齿轮测量圆棒跨距法。 相似文献
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我国青贮玉米的研究现状及市场前景 总被引:17,自引:0,他引:17
青贮玉米作为饲料玉米既能大幅度地提高饲料产量,同时具有较高的营养价值,在国民经济和人民生活中占有越来越重要的地位。在借鉴欧美等发达国家对青贮玉米研究成果的基础上,分析了我国发展青贮玉米的优势和潜力,提出了青贮玉米的育种策略、育种目标和主要用于家畜饲养业的有效利用途径。 相似文献
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Significant attention in recent years has been given to obtain a better understanding of human joint ranges, measurement, and functionality, especially in conjunction with commands issued by the central nervous system. While researchers have studied motor commands needed to drive a limb to follow a path trajectory, various computer algorithms have been reported that provide adequate analysis of limb modeling and motion. This paper uses a rigorous mathematical formulation to model human limbs, understand their reach envelope, delineate barriers therein where a trajectory becomes difficult to control, and help visualize these barriers. Workspaces of a typical forearm with 9 degrees of freedom, a typical finger modeled as a 4-degree-of-freedom system, and a lower extremity with 4 degrees of freedom are discussed. The results show that using the proposed formulation, joint limits play an important role in distinguishing the barriers. 相似文献