成庄矿2218掘进工作面应力状态电磁辐射监测

利用电磁辐射技术,准确测试了采掘工作面前方和巷道两帮侧的应力区分布,确定和评价了煤体瓦斯预抽的合理封孔深度。     

Wear Patterns and Mechanisms of Cutting Tools in High Speed Face Milling

High speed machining has received an important interest because it leads to an increase of productivity and a better workpiece surface quality. However, at high cutting speeds, the tool wear increases dramatically due to the high temperature at the tool-workpiece interface. Tool wear impairs the surface finish and hence the tool life is reduced. That is why an important objective of metal cutting research has been the assessment of tool wear patterns and mechanisms. In this paper, wear performances of PCBN ...     

唐长安城北部主要池陂及其作用

唐长安城北半部的三大内:太极宫、大明宫、兴庆宫,三大苑:即西内苑、东内苑、禁苑内各有池陂。位于其中的东、南、西、北四海,龙首池、太液池、龙池以及鱼藻池等构成了城北地区水源,在唐时的作用有:提供了水产品,成为运输关东物资的通道,调节了长安城局部水气候,对唐王朝的政治也产生了影响,更成为皇室游乐的场所。它们的水源来自清明渠与龙首渠,有水的地方就会出现园林,以供皇帝游乐、打猎之用。     

综采复杂地质构造带缩采方案研究与实施

文章通过在综采工作面缩采方案的成功实施，有效地解决了长走向综采工作面资源利用问题，在运输机槽子上铺设皮带的稳定性问题得到了验证，为今后的综采工作面缩采提供了很好的借鉴。     

复杂地质条件下对拉工作面开采技术的实践

介绍了复杂地质条件对拉工作面布置方式在实际生产中的应用。分析了应用中出现的优缺点，得出了相应的适用条件。     

内蒙古蒙古族和汉族大学生头面部特征分析

对内蒙古地区742名蒙古族和汉族大学生的20项头面部特征进行比较分析．结果表明，蒙古族和汉族女大学生的头长、眼外角间宽、眼裂宽有极显著差异，口宽、头水平围有显著差异；男大学生的头长、形态面高、容貌面高、鼻高、鼻宽有极显著差异，容貌额高、眼内角间宽、唇高、耳宽和头水平围有显著差异；蒙古族男、女大学生和汉族男大学生以特圆头型为主，汉族女大学生以超圆头型为主；汉族男大学生和蒙古族女大学生以阔面型为主，蒙古族男大学生和汉族女大学生则以过阔面型为主；两个民族的男女大学生均以狭鼻型为主．     

硬质合金端铣刀的铣削冲击

用较简单和实用的角度投影法分析了切削时的机械冲击,得出了切削时的接触类型和切入过程的接触顺序以及刀齿切入时的最佳状态切入角E_1和切出角E_2的变化,改善了刀齿的受力状态,提高硬质合金端铣刀的使用寿命。     

北票台吉急倾斜水采面坚硬顶板断裂的数值模拟研究

本文简要地介绍了我国典型水采井的坚硬顶板地质力学特征，并运用数值模拟方法分析了急倾斜水采面坚硬顶板断裂机制及相关参量的数理关系。该方法所得的结论与物理相似模拟和现场实测的结果基本吻合     

First congenital prosopagnosia case reported in China

Congenital prosopagnosia (CP) refers to the deficiency in recognizing faces without reportable brain damage. In this study we reported a CP patient (X.L.), the first CP case reported in China, and tested her with a battery of face recognition and visual cognition tasks to explore what aspects of face processing are impaired in CP individuals. Our results show that X.L. possesses a normal ability to detect the presence of faces yet her ability to discriminate between individual faces is significantly impaired compared to normal controls. In contrast, her ability to detect nonface objects is greatly preserved, suggesting that she suffers from a selective deficiency in face recognition. Further face tests reveal that she has intact feature-based analysis ability while configural and holistic processing are both impaired. We further evaluate her general capacity of holistic processing, and the results showed that her impairment in holistic processing is not restricted to faces, but to a more general level.     

端铣削刀齿切出过程解析

从理论方面对端铣削齿切出点及线进行了探讨,为确定出刀具合理几何参数、铣削方式、避开刀齿破损区提供理论依据.