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| | The train wheel rolling mill of Steel Wheel Factory of Tat YUan HeaVy Mechanical (GrouP) Limited Company are introduced. The speed relationships among oblique rolls, wheel and main roll and cross section circle line equation of middle cone section of oblique rolls are determined. The contact area among each part of oblique rolls, pressure rolls and wheel and horizontal, vertical component of force of each section of oblique rolls are computed. In addition, through analyses of forces under the condition of b... | | 对太原重型机械(集团)有限公司钢轮厂七辊卧式车轮轧机调整参数进行了分析计算,确定了斜辊、车轮与主辊间的速度关系与斜辊中锥段处的截面曲线方程:计算了斜辊各部位、压紧辊与车轮的接触面积,以及斜辊各段的水平、垂直分力.此外,通过对车轮轧制过程中作用在各动态平衡体系力进行分析,得到了相互间各作用力. | | 文摘来源 | | Discussing the dynamic balance between cultivated land demands and supplies and comprehensively analyzing the driving factors for the changes of the balance, this paper presents the dynamic balance system of cultivated land demands and supplies with the conceptual framework of multi-scales. In accordance with such main processes as monitoring changes, this paper puts forward a forewarning system of dynamic balance between cultivated land demands and supplies at multi-scales , aiming at the driving factors. ... | | 在系统讨论和典型概括耕地供需动态平衡特征和分析耕地供需平衡变化驱动因子的基础上 ,提出了多尺度概念下耕地供需动态平衡体系 ,并以监测变化、发现警情、明确警情、明确警度、寻找警源、明确警源、区内排警、区外排警为主线 ,从预兆量、行动量和结果量不同层面构建了多尺度耕地供需动态平衡预警体系 ,并对多层警示指标 ,特别是对最终结果层的耕地总量失衡、质量失衡、均量失衡、时间失衡等的定量分析进行了重点讨论 | | 文摘来源 | | Protection of travertine landscape in the Jiuzhai Va ll ey and Huanglong Scenic Spots has been extremely urgent. Study of constraints of the travertine landscape in the Jiuzhai Valley and Huanglong Scenic Spots indic ates that there are two dynamic equilibriums such as ecologic geological action and human activity in the Scenic Spots. Some protection countermeasures are put forward on the basis of the two dynamic equilibrium system. | | 九寨沟、黄龙钙华景观保护建设 ,迫在眉睫。本文在评述九寨沟、黄龙钙华景观特征的基础上 ,通过对其变化的制约因素的研究 ,表明两者均存在两个动态平衡体系 ,即与生态地质作用之间的动态平衡和与人类活动间的动态平衡体系 ;并从两个动态平衡体系来探讨保护对策。 | | 文摘来源 | |   |
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