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双肘杆压力机误差建模及公差优化分配 被引量:2
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作者 骞华楠 陶璟 于随然 《东华大学学报(自然科学版)》 CAS CSCD 北大核心 2018年第4期513-519,共7页
近净成形要求压力机具有较高的输出精度,为此需要对其进行精度设计,即建立其误差传递模型,从而经济合理地分配各零部件的精度参数。采用矩阵法构建双肘杆压力机传动连杆误差模型及多体系统理论构建其框架几何误差模型;在此基础上,基于... 近净成形要求压力机具有较高的输出精度,为此需要对其进行精度设计,即建立其误差传递模型,从而经济合理地分配各零部件的精度参数。采用矩阵法构建双肘杆压力机传动连杆误差模型及多体系统理论构建其框架几何误差模型;在此基础上,基于误差独立作用原理建立压力机传动连杆-框架综合误差模型,通过灵敏度分析找到影响其输出精度的关键因素;综合考虑加工成本和机构输出可靠性对关键部件公差进行优化分配,进而给出在各零部件加工及装配中应采取的措施。案例研究结果表明,该方法能够建立压力机传动连杆-框架综合误差模型,优化后各关键部件公差均有所增大,兼顾了经济性能和精度性能。 展开更多
关键词 双肘杆压力机 多体系统理论 误差模型 公差优化分配
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军校大学语文专题化教学探索与实践 被引量:1
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作者 苏爱风 陶静 《语文教学通讯》 2022年第24期5-7,共3页
鉴于军校大学语文面临的诸多现实问题,应通过积极整合教材资源、完善选修课程、拓展活动渠道及改革考核方式等实施专题化教学,以此实现课程教学目标,提高育人效果。
关键词 军校 大学语文 专题化教学 实践
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Application Analysis of Magnesium Sulfate in Patients with Preeclampsia Caused by Elective Cesarean Section
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作者 GUANTianyun MAOJianxiong +1 位作者 taojing ZHAOLi 《外文科技期刊数据库(文摘版)医药卫生》 2022年第9期006-009,共4页
Objective: to investigate the effect of magnesium sulfate on patients with preeclampsia after elective cesarean section. Methods: 92 patients with preeclampsia during elective cesarean section who were delivered in ou... Objective: to investigate the effect of magnesium sulfate on patients with preeclampsia after elective cesarean section. Methods: 92 patients with preeclampsia during elective cesarean section who were delivered in our hospital from February 2020 to November 2021 were selected as the study objects. According to the odd and even number of the patients admission number, they were divided into two groups: the reference group and the study group, with 46 patients in each group. The reference group was treated with misoprostol, while the study group was treated with magnesium sulfate on the basis of the reference group. The blood pressure, serum TLR4 level, postoperative bleeding, postoperative pain severity score, and the incidence of postoperative adverse reactions were compared between the two groups. Results: there was no significant difference in blood pressure level and serum TLR4 level between the two groups before treatment (P > 0.05). After intervention, the systolic blood pressure, diastolic blood pressure and serum TLR4 level of patients in the study group were lower than those in the reference group, and the difference between the two groups was significant (P < 0.05). The amount of bleeding in different time periods and the total amount of bleeding after intervention in the study group were less than those in the reference group, and the score of postoperative pain severity in the study group was lower than that in the reference group, with statistical significance (P < 0.05). After comparison, the incidence of postoperative adverse reactions in the reference group was significantly higher than that in the study group (P < 0.05). Conclusion: the application of magnesium sulfate in the intervention of patients with pre eclampsia after elective cesarean section has a better effect. It can effectively improve the blood pressure level and serum TLR4 level of patients, reduce the amount of postoperative bleeding of patients, reduce the postoperative pain of patients, and promote the reduction of the incidence of adverse reactions of patients. It has a higher application value. 展开更多
关键词 elective cesarean section PREECLAMPSIA magnesium sulfate application effect
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