翡翠的拉曼光谱研究

对于需要无损检测的宝玉石，拉曼光谱是一种方便、快捷、准确的新技术。以激发光波长分别为633nm的He-Ne激光器和457nm的固体激光器作为激发光源，测定和分析一系列翡翠样品的拉曼光谱，提出拉曼光谱检测技术可以做为鉴别翡翠的有效辅助手段。     

Applications of dynamic programming in survey engineering

Recent research has shown that probabilistic and non-probabilistic dynamic programming techniques can be applied beneficially in the solution of optimal design and management problems in surveying. The survey design system is presented. A non-probabilistic dynamic programming solution of a second order, one dimensional optimal survey design problem is outlined and some applications of Bayesian dynamic programming to survey logistics and management problems are demonstrated. A useful 'technology transfer' technique is included to illustrate one method of introducing systems theory and operations research to survey engineering.     

Thermodynamic analysis,parametric study and optimum operation of the Kalina cycle

The work described here has a major objectives the complete thermodynamic analysis and the parametric study of the Kalina Power Unit. The device layout optimization is based on the presentation of the unit on the T-h and h/T-s thermodynamic charts. The operation of the power unit is simulated by the use of equations describing the thermodynamic behaviour of the NH₃/H₂O mixture. The important parameters of the unit, i.e. high, medium and low pressures/rich, weak, working solution and boiler vapour mass fraction are discussed and related. Correlations are developed which describe the optimum operation of the Kalina cycle. The maximum thermal efficiency, the heat required to drive the unit and the work produced may be directly calculated from analytical functions in terms of the ambient temperature and the low pressure of the units. The maximum theoretical efficiency ranges from 42·7% to 46·6%.     

冲压增程炮弹外弹道理论分析及数值仿真

简述了冲压增程炮弹增程原理,建立了进气道、发动机一体化外弹道计算模型,通过数值仿真得到了155 mm增程弹弹道曲线。通过对仿真结果进行分析,得到了射程随部分设计变量变化的关系曲线,为增程弹总体优化设计奠定了理论基础。     

菊花中黄酮类物质提取方法的研究

就水提法、醇提法、超声波法对菊花中黄酮类化合物的提取效果进行了比较,并使用正交实验确定了最佳提取条件。实验结果表明,菊花中总黄酮类物质的醇提法最佳提取条件为C3B3A1,即用1倍量80%的乙醇连续回流提取3次(每次2h);超声波法的最佳提取条件为:将样品置于60倍样品重的80%乙醇中浸泡24h,超声波提取15min。     

经济合理地选择局部通风机的方法

针对当前局部通风机选择不当造成的浪费现象 ,采用实例理论计算的方法 ,阐述经济合理选择局部通风机的方法。     

立式圆筒储罐最经济内径的计算方法

建立立式圆筒储罐罐体质量函数表达式,应用极值理论导出储罐最经济内径公式;并采用数值理论反复迭代法,最终确定储罐的最经济内直径值,以该内径值作为储罐的内直径,这样设计的储的总质量最小。     

跨临界循环高温热泵的控制方法

跨临界循环高温热泵系统中,对循环高压、负荷的控制是保证系统稳定、高效运行的关键.本文介绍了几种在高温热泵跨临界循环中对循环高压的控制方法,如毛细管控制法、膨胀阀控制法等,以及系统负荷的频率控制法,并讨论了各自的优缺点.在此基础上,提出在满足负荷要求的前提下,压缩机最优频率的调节和系统最优循环高压控制相结合的控制策略.     

基于齿面寿命的齿轮参数优化设计

阐述了以齿轮齿面寿命为目标的齿轮传动几何参数优化设计方法 ,该优化设计考虑了负荷大小、接触点几何形状、滑动速度、油膜厚度等因素的影响。以齿轮减速器为例说明了数学模型的建立方法 ,并通过实例进行了印证 ,结果表明该优化设计方法能为提高齿面寿命提供有价值的齿轮参数组合     

容器式液塞捕集器结构尺寸的优化设计

提出了一种初步计算容器式液塞捕集器尺寸的方法，建立了捕集器工艺计算的数学模型，编制了捕集器系统动态模拟软件。通过观察捕集器内的液位和压力波动情况，从而确定一定生产条件下捕集器的最优结构尺寸。结果表明，液塞单元的分布对捕集器的结构尺寸有很大影响。