Delphi环境下目标规划图解法算法程序的开发

作为目标规划算法平台的一个重要组成部分,研究了多目标线性规划中的目标规划图解法算法程序的开发,以方便该方法在各领域的应用。首先,介绍了目标规划的原理、建立目标规划模型的步骤。然后,介绍目标规划图解法的计算步骤以及在Del-phi环境下开发目标规划图解法的流程和具体方法。最后,通过实例对目标规划图解法算法程序的正确性进行了验证。所开发的算法程序直观简捷,方便工程人员的使用。     

基于USS协议的泥泵输送实验台变频控制系统设计

为解决因泥泵输送试验台变频器使用端子控制方式与可编程逻辑控制器连接而引发的现场布线复杂、抗干扰能力弱、采集信号数量较少等问题,设计了基于USS协议通信的变频器控制系统,并根据实验台现有系统组成,分别设计了基于西门子200PLC与300PLC的USS协议通信方案,并对其进行了分析比较。结果表明,采用USS协议通信方式的变频器控制系统抗干扰能力强,可采集信号数量也有所提高。     

油田采出水回注处理技术研究进展与展望

油田在生产开发过程中产生了大量采油污水,经处理回注地层是采出水的最优出路。文章首先分析了油田采出水的特点,然后重点介绍了传统与新兴的油田采出水回注处理技术的研究与应用进程,并对油田采出水回注处理技术下一阶段的研究与发展方向进行了展望。     

涂覆MIL-101(Cr)干燥剂的翅片管换热器的实验研究

干燥剂涂层换热器(DCHE)是一种新开发的翅片管表面带有干燥剂涂层的换热器,它可以同时处理潜热和显热.为了获得更高的性能,高孔隙度的金属有机框架(MOF)被引入到设计中.本文通过水浴法成功合成MIL-101(Cr)材料,并对材料进行X射线衍射(XRD)、N2吸附-脱附测试、水蒸气吸脱附曲线、电镜扫描等系列物理表征.制作...     

基于建设用地和人口标准的中国公园 配置演化特征分析

公园是城市中最优质的公共开放空间和最普惠的民生福祉，科学研判人地影响下公园的配置特征，可为新时代推进中国“公园-用地-人口”统筹优化提供科学依据。以中国建制市为研究单元，基于建设用地和人口两大视角，从总量、格局、个体3个层次，探究1981—2016年全国与不同用地、人口结构城市公园配置的演化特征。研究表明：1)我国公园配置由“提升密度”到“提升规模”，整体呈“以地推动、与人脱节”的规律，其中公园率具有较好发展趋势，人均公园面积高速增长但不可持续；2)各结构城市差异化配置明显，高人均用地水平、低密度、小城市普遍趋于“高密度、小规模”配置公园；低人均用地水平、高密度、特大城市人均公园面积长期处于不理想状态。基于人地双标准对公园配置进行了多维度、长时期、大范围的考察与分析，以期为系统完善公园配置“因地因人”导向规划提供参考。     

A scale-based connected coherence tree algorithm for image segmentation.

This paper presents a connected coherence tree algorithm (CCTA) for image segmentation with no prior knowledge. It aims to find regions of semantic coherence based on the proposed epsilon-neighbor coherence segmentation criterion. More specifically, with an adaptive spatial scale and an appropriate intensity-difference scale, CCTA often achieves several sets of coherent neighboring pixels which maximize the probability of being a single image content (including kinds of complex backgrounds). In practice, each set of coherent neighboring pixels corresponds to a coherence class (CC). The fact that each CC just contains a single equivalence class (EC) ensures the separability of an arbitrary image theoretically. In addition, the resultant CCs are represented by tree-based data structures, named connected coherence tree (CCT)s. In this sense, CCTA is a graph-based image analysis algorithm, which expresses three advantages: 1) its fundamental idea, epsilon-neighbor coherence segmentation criterion, is easy to interpret and comprehend; 2) it is efficient due to a linear computational complexity in the number of image pixels; 3) both subjective comparisons and objective evaluation have shown that it is effective for the tasks of semantic object segmentation and figure-ground separation in a wide variety of images. Those images either contain tiny, long and thin objects or are severely degraded by noise, uneven lighting, occlusion, poor illumination, and shadow.     

相控阵雷达目标搜索的MAB模型策略

针对相控阵雷达波束指向的问题,研究相控阵雷达搜索状态下的波束指向控制策略,目的在于提升其目标发现概率以及发现效率。将相控阵雷达面临的搜索问题看作为一类多臂赌博机问题,进而在上限置信度指数方法的基础上对该问题进行求解,同时与贪婪算法等其他方法进行对比。仿真结果表明,所得到的雷达波束搜索策略使得雷达发现目标所用时间一般不超过扫描一次负责空域所用时间的两倍。在相同搜索时间内,雷达对弱小目标发现概率提升至少20%。并且该方法算法复杂度相对较低,具备实际应用能力。     

Test results from a solar boiler for saline water distillation

In this paper the performance of a low temperature, 50–70 C, solar boiler is presented. The boiler consisted of a double-glazed flat-plate solar collector, a flash chamber, a water cooled surface condenser, a circulating pump, and a temperature-controlled preheater to simulate constant temperature thermal storage. Data were obtained on this boiler from October 1980 to May 1981. During this period, the instantaneous total incident solar radiation at noon, as measured by a pyranometer in the plane of the collector ranged from 0.7 to 1.0 kWm^-2 and the diurnal total incident solar radiation ranged from 13 to 29 MJ m^-2day^-1. At these conditions the instantaneous efficiency of the collector ranged from 30 to 55 percent while the diurnal efficiency ranged from 20 to 44 percent.The results show that the performance of the solar collector was the dominant factor in determining the performance of this boiler. They also show that low temperature steam, 50 to 70 C, from such boilers can be produced to drive multieffect distillation systems using high performance evaporators for desalting saline water.     

TiO2-莫来石远红外陶瓷的研究

采用传统的陶瓷制备方法，以TiO2-莫来石系为主要研究对象，研究了不同组分和烧成温度对陶瓷材料的远红外吸收性的影响。试验表明，TiO2-莫来石体系陶瓷材料的远红外吸收性能，随着烧结温度的升高明显降低；TiO2能有效促进材料烧结、降低烧结温度，提高材料的红外吸收性能。     

Global stabilizer of a general class of feedbacknonlinear systems and its exp onential convergence

We discuss the global stabilization procedure which renders a general class of feedback nonlinear systems exponential convergent . Our stabilizer consists of a nested saturation function , which is a nonlinear combination of saturation functions. Here we prove the exponential convergence of the stabilizer for the first time and give numerical examples to illustrate the efficiency of the result given above.