Some investigations on fuzzy P + fuzzy I + fuzzy D controller for non-stationary process

The paper addresses the adaptive behaviour of parallel fuzzy proportional plus fuzzy integral plus fuzzy derivative (FP+FI+FD) controller. The parallel FP+FI+FD controller is actually a non-linear adaptive controller whose gain changes continuously with output of the process under control. Two non-stationary processes, whose characteristics change with time, are considered for simulation study. Simulation is performed using software LabVIEW TM . The set-point tracking response of parallel FP+FI+FD is compared with conventional parallel proportional plus integral plus derivative (PID) controller, tuned with the Ziegler-Nichols (Z-N) tuning technique. Simulation results show that conventional PID controller fails to track the set-point and becomes unstable as the process changes its characteristic with time. But the parallel FP+FI+FD controller shows considerably much better set-point tracking response and does not deviate from steady state. Also, a huge spike is observed in the output of PID controller as the reference set-point and process parameters are changed, while the FP+FI+FD controller gives spike free control signal.     

利用鸡粪为原料生产保水有机肥

从国内肥料使用的发展趋势和养鸡业的现状和发展出发，分析了当前大型养鸡场中鸡粪产生的环境污染问题及鸡粪肥料化利用的可能性，介绍了一种以新鲜鸡粪为原料，经EM菌群发酵，添加一定量的保水剂生产保水有机肥的生产工艺，产品经使用效果良好。     

极端海况下FPSO系泊系统安全性评估与分析

针对近年极端海洋性气候频发所导致的FPSO系泊系统安全性问题,从服役多年系泊系统钢缆的剩余强度入手,评估影响船体运动的环境参数,给出系泊钢缆的安全系数。利用准静态的方法估算环境等级的范围,选取南海某型FPSO建立系泊系统耦合计算模型。应用AQWA-DRAFT与AQWA-NAUT模块,采用时域非线性方法对系泊系统进行耦合分析,在满足规范系数的前提下确定现服役系泊系统的定位能力,预报系泊系统所能承受的最大风浪流极值组合及对应的台风等级。通过计算可看出钢缆强度的下降直接影响着系泊系统的定位能力,导致其无法抵御百年一遇的台风,系泊系统可抵御台风等级降至12级。     

生物Reichardt运动检测器和感受域模板的 FPGA设计与实现

为了在图像处理中快速地实现运动检测和相机自身运动方式估算,引入了基于生物视觉机制的Reichardt运动检测器模型(EMD)和感受域模板.分析了Reichardt运动检测器模型的基本特性及其缺陷.为了克服模型上的主要缺陷,在应用中选择了一种优化模型,应用该模型可以得到较好的运动检测结果.同时,提出了基于苍蝇视觉系统的6个感受域模板,用以实现简单自身运动方式的估算,如相机自身的平移、旋转等.最后,在FPGA(FieldProgrammable Gate Array)平台上实现了相关的算法.实验结果表明,优化后的运动检测器可以快速地判断局部运动方向,感受域模板可实现在特定背景下的简单运动方式估算;对分辨率为256×256像素的输入图片,本设计中的FPGA系统可达到每秒350帧的处理速率,所产生的延时仅为0.25μs,达到了快速处理的要求.此模型可应用于实时的机器视觉系统,如进行障碍物检测、整体运动方式估算、UAV/MAV的稳定控制等.     

医院无线定位系统设计及实现

随着医院WLAN的建设与发展,如婴儿防盗,资产管理以及人员定位等基于WIFI的物联网应用正逐渐增多。在医院实际需求的基础上,结合现有的WIFI实时定位技术,提出了一套应用于医院的无线局域网(WLAN)实时定位系统,并对其基本架构和管理控制模式进行了介绍,并展望了WIFI实时定位技术的研究发展方向。     

Quantitative analysis of pheromone production in irradiated Caribbean fruit fly males,Anastrepha suspensa (Loew)

Pheromonal volatiles emitted by irradiated and control 5- to 11-day-old Caribbean fruit flies,Anastrepha suspensa (Loew), were collected on Tenax adsorbent filters and quantified by gas chromatography (GC). The components released were identified by comparison of retention times on GC and by mass spectrometry (MS) with authentic synthetic standards. Pharate adults were irradiated with gamma rays from a⁶⁰Co source at a dose rate of 10.3 Gray (Gy)/min. The total dosages given were 30, 50, 70, and 100 Gy. Pheromone volatiles were collected from adult males when they were between 5 and 11 days of age. The compounds quantified were (Z)-3-nonenol and (Z, Z)-3,6-nonadienol, which eluted from the GC column together and were quantified as one peak,-bisabolene, suspensolide, anastrephin, and epianastrephin. Irradiation with 30 Gy did not significantly reduce any pheromonal components, nor did it change the pheromonal blend. In contrast, suspensolide and bisabolene were significantly reduced in flies irradiated with 50 Gy, while the nonenols and epianastrephin were reduced at the 70-Gy dose. Irradiation with the 100-Gy dose reduced all components with the exception of suspensolide.University of Florida Agric. Exper. Sta. Journal Series No.R-03156.     

磁控溅射法镀制氮化铝薄膜特性研究

氮化铝薄膜具有高折射率,良好的化学稳定性,耐磨摩、高电阻等特性在微电子器件和光学薄膜中有着广泛地应用.本文研究了反应式磁控溅射方法利用Ar/N2混合气体镀制氮化铝薄膜的工艺过程,实验表明在高真空和高泵浦速率条件下,放电电压直接依赖于反应气体珠浓度.薄膜的折射率,消光系数和薄膜硬度都依赖于氮气浓度的比例.通过工艺研究,找到了氮气在不同浓度下对氮化铝薄膜的折射率,消光系数以及薄膜硬度的影响,找出了镀制氮化镀制氮化铝薄膜的最佳工艺参数.在Ar/N2工作气体中氮气含量保持在40%条件下,用反应式磁控溅射方法,可以精确镀制出良好的氮化铝薄膜,其中折射率范围在2.25~2.4之间,消光系数为10-3,薄膜显微硬度大于20GPa.该薄膜可以广泛应用于微电子器件和光电器件上.     

一种基于漏桶算法的模糊流量控制器的设计

设计了一种基于动态速率漏桶算法的高性能智能流量控制器。应用模糊控制原理，根据源流量情况，动态调节速率漏桶，基于对流量源实际平均信元速率的实时估计，充分利用信元加标记和放弃机制对探测到的违约元进行处理，仿真结果验证了该控制器对违约流量源具有较高的检测能力、良好的动态行为和零错误报警概率，对遵守“流量合同”连接的服务质量（QoS)比任何传统流量控制器有更好的保证。     

结构工程设计自动参数化图形系统的开发研究

以钢结构设计专家系统（ＥＳＯＳＳＤ）图形系统为例，介绍了其设计原理及主要思想，提供了建造ＡＣＡＤ图形函数库，利用ＭＳ－ＦＯＲＴＲＡＮ实现模型代真等方法，并对系统参数化建模及施工图绘制进行了探讨和研究。     

X射线荧光仪FP法测定生铁中多元素

本文研究在X射线荧光仪上通过基本参数法 (FP法 ) ,用钢的直读光谱国家标样绘制工作曲线 ,测定生铁中的Si、P、S、Ti、Mn、Cu、As、Cr、Ni、Al、Mo、V、Bi、W等元素 ,获得满意效果。