电梯用无齿轮永磁同步曳引机测试系统设计

由于无齿轮永磁同步曳引机具有性能优越、占用空间小的特点 ,在电梯驱动系统中的应用日趋广泛。文章论述了为生产厂家设计的一套设备专用测试系统 ,详细介绍了系统软、硬件的设计和实现方法。实际应用表明 ,该测试系统运行稳定可靠 ,操作简便 ,显著提高了测试效率 ,实现了无齿轮永磁同步电梯曳引机测试过程的自动化     

Distribution and differentiation of myeloid-derived suppressor cells after fluid resuscitation in mice with hemorrhagic shock

Objective

To investigate the distribution and differentiation of myeloid-derived suppressor cells (MDSCs) in hemorrhagic shock mice, which are resuscitated with normal saline (NS), hypertonic saline (HTS), and hydroxyethyl starch (HES).

Methods

BALB/c mice were randomly divided into control, NS, HTS, and HES resuscitation groups. Three subgroups (n=8) in each resuscitation group were marked as 2, 24, and 72 h. Flow cytometry was used to detect the MDSCs, monocytic MDSCs (M-MDSCs), and granulocytic/neutrophilic MDSCs (G-MDSCs) in peripheral blood nucleated cells (PBNCs), spleen single-cell suspension, and bone marrow nucleated cells (BMNCs).

Results

The MDSCs in BMNCs among three resuscitation groups were lower 2 h after shock, in PBNCs of the HTS group were higher, and in spleen of the NS group were lower (all P<0.05 vs. control). The M-MDSC/G-MDSC ratios in PBNCs of the HTS and HES groups were lower (both P<0.05 vs. control). At 24 h, the MDSCs in PBNCs of the NS and HTS groups were higher, while the spleen MDSCs in the HTS group were higher (all P<0.05 vs. control). The M-MDSC/G-MDSC ratios were all less in PBNCs, spleen, and BMNCs of the NS and HTS groups, and were lower in BMNCs of the HES group (all P<0.05 vs. control). At 72 h, the elevated MDSCs in PBNCs were presented in the HTS and HES groups, and in spleen the augment turned up in three resuscitation groups (all P<0.05 vs. control). The inclined ratios to M-MDSC were exhibited in spleen of the NS and HTS groups, and in PBNCs of the NS group; the inclination to G-MDSC in BMNCs was shown in the HES group (all P<0.05 vs. control).

Conclusions

HTS induces the earlier elevation of MDSCs in peripheral blood and spleen, and influences its distribution and differentiation, while HES has a less effect on the distribution but a stronger impact on the differentiation of MDSCs, especially in bone marrow.

     

试论企业文化建设与人力资源管理

企业有没有吸引力、能不能形成强有力的凝聚力在很大程度上依赖于企业文化的建设，没有优秀的企业文化便不会有卓越的企业，这已经成为绩效企业管理者们的共识。本文从企业文化建设的角度谈谈企业的人力资源管理问题。     

How to be Singaporean: becoming global national citizens and the national dimension in cosmopolitan openness

ABSTRACT

This paper looks at how cosmopolitanism is practised amongst Singaporeans who have experienced Singapore’s education reform in the 1990s. Cosmopolitanism in Singapore is tied to state-intervention with a national orientation. To complement Singapore’s push towards cosmopolitanism, the education reform in the 1990s promoted the idea of a national citizen with a global orientation. I looked at 40 Singaporeans born after the year 1990 to investigate cosmopolitan attitudes that have emerged from the tensions between cosmopolitanism and nationalism. To meet the state’s ideals of cosmopolitanism, these Singaporeans employed strategies to practice a particular form of cosmopolitan openness which prioritise national interests. Nationalism and cosmopolitanism co-exist in Singapore and share a dialectic relationship as I argue that these Singaporeans are global national citizens.     

用于被动力/力矩再现的新型磁流变液阻尼器

研制了一种用于被动力/力矩再现的新型磁流变液阻尼器,该阻尼器能够在磁场的作用下产生连续变化的阻尼力/力矩.阻尼器的结构包括一个上盖和一个下盖,一个转子设置于上盖和下盖之间,转子与上下盖之间的间隙充满磁流变液,在磁场作用下其粘度变大时,转子相对于壳体将受阻尼力作用.阻尼力矩的模型主要由以下几部分组成:一是由磁场作用于磁流变液产生的力矩,二是由磁流变液的动力粘度产生的力矩,最后是由装置的摩擦产生的力矩.由动力粘度产生的力矩可以通过简单的方法进行计算,由摩擦产生的力矩可以通过实验测得,而由磁场产生的力矩则要通过电磁场的有限元分析得到.最后,对研制的阻尼器原型进行了性能实验,检验了设计方法的有效性.     

一道IMO试题的推广及应用

给出了一道第36届IMO不等式赛题的推广,并应用推广结论解证了一组不等式.     

多重共振系统的分析方法

根据 KBM方法的思想引入平均法 ,给出了多重共振发生的条件。通过在多重共振关系式及对应的相位中引入相应的调谐参数 ,得到了分析多重共振分岔系统的改进平均法 ,并应用此方法结合奇异性理论研究了四圆盘扭振系统三重共振定常运动分岔问题     

邓小平民族理论与西部大开发

邓小平在开创具有中国特色的、解决中国民族问题的伟大实践中做出了重要贡献。在西部大开发过程中认真学习邓小平民族理论并以之为指导具有重要意义。西部大开发符合邓小平民族理论中关于“各民族之间真正平等”的思想，“处理民族问题有助于巩固国防”的思想，“两个离不开”的思想。     

大学公共体育理论课研究刍议

本文依据学生对公共体育理论课教学内容的选择进行了调查分析 ,从而大胆改革了教学方法与考核办法 ,并建立了公共理论课的质量评估体系     

自主与合作学习模式下英语听说能力的培养

教育部对非英语专业学生听说能力提出了新要求,然而许多高校的大学英语教学却因办学规模扩大不得不实行大班授课,大学英语听说教学改革势在必行。通过一个学年的听说教学实践活动,证明了自主与合作相结合的学习模式有助于激发学生的学习兴趣,培养学生的合作能力和自主学习能力,提高学生整体的听说水平。