"真空辅助灌浆技术"在预应力混凝土结构施工中的应用

通过交通银行西安分行办公大楼预应力混凝土的施工,重点介绍了真空辅助灌浆技术在后张法预应力混凝土结构中的应用,总结了真空辅助灌浆技术的原理和技术要点。     

离心力对旋叶式分离器壁面液膜界面不稳定性的影响

本文对旋转流场条件下离心力对旋叶式分离器壁面液膜界面不稳定性的影响规律进行了理论研究。首先利用势函数对汽液两相的动量方程和连续方程进行线性化处理。然后通过对无黏条件下液膜界面的受力分析,获得汽液界面的动力学边界条件和运动学边界条件,结合线性化方程组建立液膜界面波的色散方程。根据力平衡原理获得了液膜运动规律,并结合色散方程建立了界面不稳定发生的判定准则关系式。基于所获得的理论模型编写计算程序,对界面稳定性进行计算分析。研究发现,旋转流场条件下的离心力能够抑制旋叶式分离器壁面液膜界面不稳定的发生。     

SO-FDTD Analysis of the Plasma Reflectance of Epstein Distribution

The analysis of electromagnetic propagation in a dispersive medium is complicated in the time-domain because its dielectric constant is frequency-dependent. In this paper, the dielectric constant of the dispersive medium is written as a rational polynomial function, and the relationship between D and E is derived in the time-domain. It is referred to as the shift operator finite-different time-domain （SO-FDTD） method. Compared to an analytical solution and a piecewise linear current density recursive convolution （PLJERC） solution, the high accuracy and efl%iency of this method is verified by calculating the reflectance of the electromagnetic wave through a cold plasma slab. As the electron density in plasma is distributed as the Epstein formula, the effect of distribution grads and electron collision frequency on the reflectance is calculated by using the SO-FDTD method. The result shows that the increase in the distribution grads coefficient affects the reflectance sharply. When it comes to a smaller distribution grads coelBcient, the increase of the collision frequency showed a significant effect on the reflectance, but on the contrary, there is actually less and less effect till it disappears.     

工业射线胶片机械物理性能的测定及影响

本文依据相关国标提供的方法对7种胶片的吸水率,防粘连和抗划伤能力进行测定和对比,并在此基础上讨论了胶片吸水率对其防粘连和抗划伤能力的影响。     

羟基磷灰石热稳定性研究进展

概述了化学计量比HA及缺钙型HA在高温下的热分解机制,综述了国内外对HA热稳定性研究的成果,总结了通过提高钙磷比、向晶格中引入F-或K+、改变测试气氛等提高HA热稳定性的方法及其机理,展望了制备高温稳定的HA粉末和晶须的研究方向和可能的途径.     

阜阳市SBS改性沥青混凝土道路工程实践探讨

结合阜城SBS改性沥青混凝土道路工程实践,从不同侧面分析探讨影响工程质量的诸多因素,并提出针对性的防控措施,以便在今后类似工程中引以为鉴。     

Statistical process control with intelligence using fuzzy ART neural networks

With the automation development of manufacturing processes, artificial intelligence technology has been gradually employed to increase the automation and intelligence degree in quality control using statistical process control (SPC) method. In this paper, an SPC method based on a fuzzy adaptive resonance theory (ART) neural network is presented. The fuzzy ART neural network is applied to recognize the special disturbance of the manufacturing processes based on the classification on the histograms, which shows that the fuzzy ART neural network can adaptively learn the features of the histograms of the quality parameters in manufacturing processes. As a result, the special disturbance can be automatically detected when a feature of the special disturbance starts to appear in the histograms. At the same time, combined with spectrum analysis of the autoregressive model of quality parameters, the fuzzy ART neural network can also be utilized to adaptively detect the abnormal patterns in the control chart.     

PLC在电厂输煤系统中的应用

详细介绍了基于PLC的输煤程控系统的设计方式、结构特点、组成及其功能，说明了设计系统PLC程序需注意的问题。     

考虑时间不确定性的战时装备维修任务调度方法

战时装备维修任务调度可以根据实时更新的维修任务信息,及时调整装备维修方案,充分发挥其对作战的支援作用。针对战时维修任务调度中对时间不确定性因素考虑不足的问题,构建一种装备维修任务调度模型,该模型以维修任务出现的随机性、维修时间的不确定性和机动时间的不确定性为驱动条件,将维修时间和维修能力作为约束条件,以保持修复装备重要度之和最大为决策目标,进行装备维修任务调度,可以及时调整维修方案,规划最优维修任务执行路径。为了快速准确地获得装备维修任务调度结果,采用一种改进最大-最小蚂蚁系统求解维修任务调度模型。最后,通过算例验证运用该方法进行维修任务调度的及时性和有效性。     

道路交通量预测中如何考虑治超的影响

阐述了治超对公路运输产生的直接影响,并对“治超”对公路交通量的影响及在道路交通量预测中如何考虑“治超”因素的影响进行了探讨,从而有助于进行准确的道路交通量预测,同时为道路建设项目的决策和实施提供了技术支撑。