旋转曲面方程求法的探讨

首先给出空间曲线Γ绕空间直线l旋转所得到的旋转曲面方程的求法,然后,作为特例得到了空间曲线Γ绕坐标轴旋转所得到的旋转曲面方程的求法,同时亦得到了平面曲线Γ绕直线l及坐标轴旋转分别所得到的旋转曲面方程的求法,从而使旋转曲面方程的求法多样化.     

忻州窑煤矿8913综放面垮架事故分析

文章针对大同矿区两硬条件下综采放顶煤工作面开采过程中发生的垮架事故,根据支架—围岩的相互作用关系,分析了事故发生的原因,提出了实现安全开采的有效技术与管理途径。     

刚体定点运动空间极面与本体极面的计算机模拟

采用ＴｕｒｂｏＣ语言编程，用计算机模拟刚体定点运动的空间极面与本体极面绘制的三维图形直观、生动，解决了课堂教学中的难点．     

桥式起重机焊接梁疲劳强度极限状态可靠性分析

It is a great progress to determine fatigue strength of OTC's steel structure from using the method of definite allowable stress of the largest stress to using the design method of stress value probability of limiting state. The authors first introduce the principle of probability method and then give statistics of the regular patterns and the parameters which both belong to the resistance and the load-carrying effect of OTC; and also recommend the reliable norms and practical design formula. As a result, the fatigue design for cranes steps forward with a large pace.     

计算两种能量曲面所包围相体积的初等方法

用初等方法计算了二维线性谐振子和刚性双原子分子两种情况的能量曲面所包围的相体积。     

Quarterly forecasts of the italian business cycle by means of monthly economic indicators

Recent years have witnessed a growing availability of high-frequency indicators which can be used to forecast future economic activity. This paper shows how some of the widely known monthly economic indicators at present available in Italy can be used in a systematic and coordinated manner to forecast the main variables of the National Accounts. In order to reduce as much as possible the amount of judgment in the analysis of the business cycle, a model-based approach is adopted. Thus, a pseudo macro-econometric model of the Italian economy is built, which can be used to produce forecasts one semester ahead of the last National Accounts data release. The model can be used autonomously as well as in combination with the Bank of Italy's quarterly econometric model.     

福建省贮木场林用装卸桥基本参数探讨

以生产实践资料为依据，对福建省贮木场林用装卸桥基本参数进行分析探讨，以使贮木场林用装卸桥设计的基本参数更加科学合理，达到减少造价、降低成本、保证质量、提高效率、增进效益的目的     

叠拱木桥的建筑特点

提出叠拱结构模型，并探讨其在建筑工程中的应用潜力，文中要用理论分析与实物检测相结合的方法，确定叠拱在威信中外各类结构中的特殊意义，同时分析其在现代大跨度寻找中的实际应用。     

考虑分布回转效应和具有分布弹性支承之复合回转系统的临界转速

本文在简要地介绍和推导考虑分布回转效应和具有分布弹性支承之等截面轴段弹性曲线微分方程及其解的基础上,导得以广义克雷洛夫函数表达的考虑分布回转效应和具有分布弹性支承之等截面轴段的传递矩阵,用于复合回转系统的动力分析,有效而方便. 最后以国产新型精纺锭子作为算例,在电算机上算得前三阶临界转速,并将其与其他算法及实测结果作比较,结果相当接近.     

两河口特大桥拱箱悬索吊装施工方法

结合工程实例,介绍拱箱悬索吊装施工方法。