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机床主轴箱智能 CAD 与专家系统的研究
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作者 林岗 李芳 《机床与液压》 北大核心 1998年第2期28-29,51,共3页
本文讨论了人工智能、专家系统及CAD在金属切削机床主轴箱设计的应用,分别介绍了机床主传动系统转速图自动生成过程、机床齿轮箱有关零部件的智能CAD和机床主轴动态及优化设计软件系统。
关键词 人工智能 专家系统 CAD 机床 主轴
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Circadian Rhythms of Physiological Functions of the Pregnant Woman and the Fetus and the Biological Solemnity Thereof
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作者 Medea G. Zarnadze 《Open Journal of Obstetrics and Gynecology》 2016年第8期482-514,共34页
The basic rhythms of nature that left their imprint on the existence of all living organism on the Earth, arose under the influence of the Earth’s rotation relative to the Sun, the Moon and other planets and stars of... The basic rhythms of nature that left their imprint on the existence of all living organism on the Earth, arose under the influence of the Earth’s rotation relative to the Sun, the Moon and other planets and stars of the Universe. This periodicity gave rise to the rhythm that has become essential for their life. Life is a continual chemical process of building up and breaking down of organic substances, which results from the substance exchange between an organism and the environment. This makes it impossible for a living organism to exist without the external environment. Since 1978-1979 we have been carrying out a task-oriented research with the aim to approximate the moment when we are able to answer all these questions. Daily fluctuations of cardiac and motor activity of the fetus have been studied (uninterrupted daily recording of fetal ECG);polysomnography of nocturnal sleep was recorded;daily fluctuations of endocrine system activity in the pregnant were studied. A correlation was made between the functional state of maternal sleep-wakefulness biological rhythm, biological clock of the human fetus and the “light-darkness” cycle of a 24-hour solar day. In the process of the study we have developed an original method of day-to-day analysis of maternal and fetal ECGs. It has been established that a healthy fetus has distinct, diurnal variations of physiological functions. The fetal biorhythms coordinate with the status of the maternal organism being, however, in an opposite phase. The curve of the dynamics of fetal physiological system functioning shows a biphasic nature (one-phase in adults). “Active” and “quiet” (sleep-like) periods have been singled out in the human fetus. No reaction is observed in “quiet” periods. However, the “zero”-type fetal reaction recorded by us within the period from 2 p.m. to 9 p.m. does not indicate unsatisfactory condition of the fetus but rather is suggestive of a definite reduction of functional levels of the fetal physiological systems, which is necessary for vital activity. Although conventionally recognized as an indicator of poor state of the fetus, this type only calls for precise attention when recorded in fetal “active” hours. The present study has been the first in the world’s medicine and biorhythmology to detect and establish the daily rhythms of cardiac and motor activity in the human fetus. 展开更多
关键词 Circadian Rhythms BIORHYTHMS Pregnant Woman Human Fetus Puls Beats Per Minute Cardio tachogram Abdominal Electrocardiogram Lokomotor Activity Test “Activ” “Quiet” Stars Universe Space
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扩大数控机床分级变速传动系统变速范围的优化设计
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作者 张涛然 周利平 段丹丹 《河南科技》 2013年第2X期126-127,共2页
通过对现有数控机床变速结构中的结构式和结构网的分析比较,得出转速图,进而得到分级变速传动系统。运用计算机辅助设计(CAD)对分级变速传动系统进行扩大变速范围的优化设计,使得在设计过程中既能够根据实际需要选择最优设计方案,又可... 通过对现有数控机床变速结构中的结构式和结构网的分析比较,得出转速图,进而得到分级变速传动系统。运用计算机辅助设计(CAD)对分级变速传动系统进行扩大变速范围的优化设计,使得在设计过程中既能够根据实际需要选择最优设计方案,又可以加快设计速度,缩短设计周期。 展开更多
关键词 结构网 转速图 变速组 对称公比 双速电机
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