零部件质量不确定对其再制造加工的影响

针对零部件再加工路线与再加工时间的不确定性问题,建立了零部件再加工系统的开环排队网络模型.该模型考虑了再加工机器故障和有限缓冲能力,并假定机器故障率、维修率和再加工时间服从指数分布.基于分解原理和扩展方法,给出了求解模型的近似分析算法以求解零部件的平均再加工时间、再加工效率等系统参数.提出了零部件质量的标定方法,并以此...     

文化民族性与晚清高等教育演进

鸦片战争后,西方文明的冲击打乱了中国社会既有的发展秩序,晚清社会的政治、经济与文化等各个领域开始发生变革。由于文化历史与传统的原因,晚清的文化变革较为缓慢并带有鲜明的民族性特征。晚清文化民族性深刻地影响了晚清高等教育的演进。     

班级良好人际关系的创建

班级是学生成长生活的主要关系体,一个班级的良好人际关系包括师生关系、同学之间的关系、教师与家长的关系等。本论文主要从我国班级人际关系的现状入手,分析了现实班级人际关系存在的主要问题,并在此基础上探讨了如何创建班级良好人际关系。     

AsCl_3在9mol·L~(-1)盐酸一苯和水一苯相中分配比的测定

本文介绍了笔者设计的测定AsCL_3在9mol·L~(-1)盐酸—苯相的分配比(D_1)和在水—苯相中的分配比(D_2)的简便方法。试验测知,在19℃时,D_1为10.82,D2为0.0180。苯对9mol·L~(-1)盐酸中的As(Ⅲ)的萃取率为91.5％,水对苯相的As(Ⅲ)的反萃取率为98.2％(等体积一次萃取)。     

试论高等学校教师应具备的基本条件和职业道德修养

作为一名高等学校教师，应具备的条件是：热爱教育，勇于奉献；严谨治学，提高教师水平；热爱学生，严格而科学地要求学生。同时，还要加强职业道德修养，为教育事业做出应有的贡献。     

“老黄牛”耕出新沃土

文章生动的描述了被河溪人民称颂为“老黄牛”的田育才老师建校教学的事迹，以赞扬这一平凡的人所创造的不平凡的业绩．     

产教融合型企业建设的现实要义、动因与关键点

《建设产教融合型企业实施办法(试行)》是新时期国家为深化职业教育改革,推动产教融合、校企合作而出台的一份纲领性文件。建设产教融合型企业具有深远价值和意义,以此为抓手能够有效破解职业教育产教脱节难题,补齐职业教育短板和产业创新短板。现阶段,我国产教融合型企业建设的各项工作正处于起步阶段,为了保障产教融合型企业建设的有序推进,不仅要深刻理解产教融合型企业建设的现实要义和动因,还需要牢牢抓住产教融合型企业建设的关键性问题,即产教融合型企业的遴选标准量化、评价标准和评价机制构建以及激励政策的完善与落实。     

Investigation on apoptosis of neuronal cells induced by Amyloid beta-Protein

Objective: To construct a PC12 cell strain with neuronal differentiation, and observe the apoptosis and pro-liferation activity effects induced these cells by Amyloid beta-Protein (Aβ-43). Methods: 1) PC12 cells in logarithmicgrowth phase were subcultured for 24 h. After the culture fluid was changed, the cells were treated with Rat-β-NGF andcultured for 9 days. 2) Neuronal differentiation of PC12 cells in logarithmic growth phase were divided into four groups:control group (0), experimental group (1), experimental group (2) and experimental group (3). The concentrations of Aβ inthe four groups were 0 μmol/L, 1.25 μ mol/L, 2.5 μ mol/L and 5 μmol/L, respectively. The cells were harvested at 24, 48 and72 h later and stained with AnnexinV-FITC/PI after centrifugation and washing. Then flow cytometry was conducted toexamine the apoptosis percentage. 3) NGF-induced PC12 cells were selected and Aβ with different concentrations wasadded. The final concentrations of Aβ were 0 μmol/L, 1.25 μmol/L, 2.5 μmol/L and 5 μ mol/L, respectively. After the cellswere incubated in an atmosphere of 5% CO2 at 37 ℃ in an incubator for 72 h, the OD values were examined. Results: 1)Neuronal differentiated PC 12 cell lines were successfully established. 2) Flow cytometric examination indicated that Aβ(1.25, 2.5, and 5.0 μmol/L) could effectively induce apoptosis of neuronal-differented cells at the 24 h, 48 h and 72 h timepoints. 3) Aβ (0-5.00 μ mol/L) had no obvious effect on proliferation or restraining of the neuronal differentiation of thePC 12 cells after a 72 h interacting process. Conclusion: This investigation revealed successful neuronal differentiation of thePC12 cell strain. The induction of apoptosis of the neurocytes by various concentrations of Aβ was observed and the in-fluence of Aβ on induced proliferation of PC 12 cells by Rat-β-NGF was revealed. This study -05 provide basis for futureresearch on the molecular cure of AD and interdiction of AD evolution.     

仙道小说中服食松柏成仙情节的现实背景

现实生活中,在灾荒之年,人们往往会以松柏为食充饥;而在传统医学文献中,松柏还有治病的功效。魏晋之际,道教迅速发展,贵族与平民分别在自己生活的基础上创造了一些食松柏而成仙的故事,食用松柏成为道教修道成仙的一种方法。     

Relationship between the size of pontocerebellar angle tumor and audiology

Objective: To study the relationship between the size of pontocerebellar angle tumor and audiology. Methods: Retrospective analysis of accoustically evoked brainstem response (ABR) waveforms and pure tone threshold in 27 subjects with tumor of pontocerebellar angle. Results: ABR wave forms and pure tone threshold were significantly affected statistically by the size of tumors, especially those tumor larger than 3 cm in diameter. Conclusion: The primary symptom of the patient was unilateral hearing loss. Early discovery of the lesion is important and ABR is a sensitive tool for early diagnose of the tumor.