Dynamic analysis and optimal feedback control synthesis applied to biological waste treatment

The dynamics and optimal feedback control of biological waste treatment processes are examined. Modern feedback control theory is applied and results are obtained for both proportional and proportional plus integral control. A dynamic mathematical model of the system is developed by employing a Monod kinetic model, which is modified to account for endogenous metabolism, and a complete mixing flow model in the growth chamber. The feedback control is implemented via the flow rate so as to maintain desired effluent concentrations. External disturbances which cause changes in substrate concentration and/or cell concentration are considered and optimal control effort is applied. Results are also presented for impulse and step changes in the influent substrate concentration. It is found that by changing the values of the weighting factors in the objective function, it is possible to obtain good control of either the effluent substrate concentration or cell concentration.     

时空艺术的建筑

本文论述了建筑的时空艺术,从中国古典建筑的 时空化,总结出时空化的3个要素。并结合中科院图书馆 的设计实践,介绍了对建筑时空化的不懈追求。     

广州华厦大酒店改造

本案设计在注意避免过度装饰的设计的同时，巧妙运用华夏文化特色与现代手段结合．以符合酒店特定的文化语言要求，并注重以人为本，在现有的建筑条件下对酒店室内设计加以了改造。     

圆之舞

它离闹市不远，但它又确实置身于都市之外。靠近它，我们已逐渐看清它的轮廓，现代、气质高雅，简朴中蕴含令人向往的单纯。     

幼儿乐园

重新创造!从建筑外观、室内、标志,设计师全新诠释了宁波市第一幼儿园。首先从建筑外观来看,设计借用建筑的壳。设计师用黄色、米色、土红等色彩区分建筑的前后关系,形成积木式结构,整个建筑充溢大块的抽象手绘图案,如幼儿随意的涂鸦,在造型上加入钢架亭子与铝合金扁管排线,在追求童趣的同时又强调这是一栋现代风格的建筑。     

混凝-微滤组合工艺处理饮用水的中试研究

采用处理能力为300m^3／d的混凝-微滤组合工艺处理饮用水。连续监测了系统的处理效果及膜污染特性。结果表明，该系统具有良好的处理效果，出水水质满足《生活饮用水卫生标准》（GB5749-2006）的要求。系统运行期间，跨膜压差及膜比通量仅有较小程度的下降，排泥周期由24h变为48h，对膜污染和出水水质均未产生显著影响。     

岩土边坡地震崩滑三级评判方法浅议

岩土边坡地震崩滑是最为严重的地质灾害之一,在对其可能性提出及时有效的评价预测的问题上,岩土边坡地震崩滑三级评判是一套近些年发展起来、逐渐趋于成熟的方法。本文正是基于岩土边坡地震崩滑三级评判的思想,对各级评判中所用的方法及相关问题进行详细的论述,对这套方法在实际中的应用有一定的指导意义。     

Evaluation of solar temperature field under different wind speeds for Shanghai 65 m radio telescope

The Shanghai 65 m radio telescope is currently the largest full range rotatable radio telescope in Asia. Gravity, wind and temperature are the three main factors which may have a bad effect on the reflector’s surface precision. To study the effect of the thermal deformation caused by daily non-uniform temperature fields on the surface precision of the main reflector, both the temperature field and its effect were studied in detail for two typical days (January 15th and July 15th). The method to simulate temperature fields was studied initially, considering heat conduction, solar radiation, shadowing, air convection, sky radiation and ground radiation. Then, an integral parametric thermal finite element model (FEM) of the telescope was established using the ANSYS thermal analysis module. Finally, the effect of non-uniform temperature fields on the surface precision of the main reflector was estimated in terms of the Root Mean Square (RMS) deformation based on temperature transient analysis. The proposed methods and conclusions drawn can provide valuable information for thermal design, thermal monitoring and thermal control of the Shanghai 65 m radio telescope and other similar giant antenna structures.     

数据融合技术在变压器状态评估中的应用

电力变压器是电力系统及变电站的最至关重要的设备之一。对电力系统进行运行维护时,监测并预报变压器运行状态并且能够有效地监测并判断变压器的故障情况具有非常现实的意义。基于设备状态信息融合技术,分析了D-S证据理论的基本原理、组合规则和决策过程。通过具体的实例论述了诊断方法的具体可行性,比较了单一诊断方法(只经神经网络判断的结果)与信息融合技术的正确率,并指出信息融合技术的发展优势和可实现性。