基于包络理论的原木截面检测及再现方法研究

介绍了一种应用激光检测技术将原木截面形状再现并计算出原木截面面积的新方法,即应用基于包络理论的原理建立测量系统模型,应用无线数据采集系统采集检测到的数据,然后利用采集到的数据在计算机中进行原木形状的再现,并进行包络线上点坐标的确定以及包络面积的计算,最后对可能出现的结果进行了分析。     

具有极小Hosoya指数的含圈共轭图

图G=(V(G),E(G))为简单连通共轭图,即含有完备匹配的图,其顶点集为V(G),边集为E(G).n,m表示含有n(n≥8)个顶点m(n≤m≤n+2n-2)条边的共轭图集合.用m(G,k)表示G中恰含k条边的匹配个数.z(G)表示图G的Hosoya指数,即G的所有匹配的总数.对于任何一个共F轭图G,都存在一个完备匹配.把G的边集分成两个子集,其中一个子集为图G的完备匹配所含的边,记为M(G),另一个子集为图G除完备匹配之外剩余的边,记为Q(G).对于G中任一个k-匹配,都可以从完备匹配M(G)中选j(0≤j≤k)条边,再从Q(G)中选择k-j条边,且保证所选的k条边互不相邻.如果对任意G1,G2∈n,m和k≤2n,都满足m(G1,k)≤m(G2,k),那么,就可以证明∑k2n=0m(G1,k)≤∑k2n=0m(G2,k),即z(G1)≤z(G2).本文用这种排列组合的方法研究并刻画了n,m中具有最小、次小Hosoya指数的极值图.     

Analysis of reasonable wind farm energy storage capacity range

The wind farm output power fluctuations caused by changing wind speed can be improved by configuring the appropriate storage energy capacity .For the problem that how to select the storage capacity more economical, two indicators for the judgment of the optimization wind power output are mentioned, which is based on a method calculating storage energy capacity. By detailed analysis of the all kinds of factors that can influence the reasonable value of storage capacity, and by using the cost of storage capacity and the smoothing effect of wind farm output as assistant criterion, a reasonable storage capacity range is discussed.     

基于V2X的混合动力汽车分层能量管理及优化

为了解决混合动力汽车的实时能量管理及优化问题,在保证不过多简化被控对象的基础上得到最优解,该文提出一种基于V2X（vehicle to vehicle,车车通信,以及vehicle to infrastructure,车与交通设施通信）的分层控制方法。设计了一种分层控制器,上层控制器基于交通信号灯正时（signal phase and timing,SPAT）得到目标车速的初始值,并采用多岛遗传算法和非线性模型预测得到最优目标车速。下层控制器根据上层控制器的最优目标车速,采用自适应等效燃油消耗最小原理（adaptive equivalent consumption minimization strategy,A-ECMS）,得到发动机和电机的最优输出功率。该文对分层控制方法进行了硬件在环仿真,仿真结果表明,该文提出的分层控制方法可以很好地实现混合动力汽车的实时能量管理,有效地避免混合动力汽车红灯停车,实现良好的车速跟随并减少百公里油耗。该研究可为解决混动力汽车实时能量管理及优化提供参考。     

Construction and analysis of knowledge graphs for multi-source heterogeneous data of soil pollution

The decommissioning and overall relocation of urban industrial enterprises have generated a large number of decommissioned contaminated sites, and the leftover soil pollution is gradually becoming a major problem that restricts urban green development and damages human health. Deep mining and efficient management of site soil pollution information through digitization and informatization are needed to solve these problems more accurately and efficiently. Knowledge mapping for visual analysis of relevant pathways is a forward-looking approach in soil contamination management that does not require complex testing instruments, thus saving research manpower, time and cost. Data associated with contaminated sites come from a wide range of sources and have different structures. Through the natural language processing technology of computer, suitable methods such as entity recognition, relationship recognition and knowledge fusion are selected to extract various types of information from contaminated sites and establish semantic networks for fast targeting of soil contamination sources, thus providing a more convenient solution. In this paper, we propose a knowledge graph construction method for multi-source heterogeneous data of contaminated sites, find sulphide contamination sources through visual analysis of knowledge graph and explore the application prospects of natural language processing techniques such as knowledge graph in contaminated site management.     

龙抬头式泄洪洞安全监测指标分析

基于1∶40正态水工模型,运用RNG k-ε双方程湍流模型对设计与校核2种特征洪水位下小浪底水电站2^#龙抬头式泄洪洞衔接段流场水力特性进行数值模拟,求解了该泄洪洞泄流能力、流速分布、压强分布及空化数等水力特性.同时从空化数、流速、测压管水头及洞顶余幅等角度提出了龙抬头式泄洪洞安全监测指标,并构建了龙抬头式泄洪洞安全监测预警级别.研究结果表明:流量系数、流速及测压管水头模拟值与试验值吻合较好,说明采用数值模拟可较好地求解龙抬头式泄洪洞衔接段流场水力特性.龙抬头式泄洪洞的风险程度可划分为安全、低警、中警及高警等四级预警状态.影响龙抬头式泄洪洞安全运行的安全监测指标按照权重由大到小顺序依次为空化数、测压管水头、洞顶余幅及流速.研究结果将为龙抬头式泄洪洞的优化设计与安全施工提供一定的理论指导与技术支撑.     

人工智能辅助种植策略对温室草莓生产调控效果对比研究

人工智能（Artificial Intelligence,AI）辅助种植有助于提高设施园艺作物精准化管理水平、缓解日益凸显的劳动力紧缺问题。草莓是典型的劳动密集型园艺作物,研究对比采用不同AI种植策略和关键技术对草莓温室生产的调控效果,可对园艺作物种植的AI技术改进和产业化应用提供参考。本研究对比分析了4个不同AI种植策略对草莓生长发育和产量及品质的调控效果,并以人工种植管理为参照,对AI种植的技术特点和存在问题进行了分析。结果表明,知识图谱、深度学习、视觉识别、作物模型和作物生长仿真器等技术在草莓AI种植中各有优势。其中,AI-1组采用知识图谱技术将专家经验、作物数据和环境数据进行融合,建立了标准化草莓种植知识结构和智慧种植决策方法,对作物生产发育的调控较为稳健,以较低的投入获得了最高产值。与人工种植管理相比,AI种植策略组的平均产量提高了1.66倍,平均产值提高了1.82倍,最高投入产投比提高了1.27倍。针对高产优质的目标,在配备较完善的智能化设备和控制组件的温室生产条件下,AI辅助种植能有效提高草莓种植管控的精准度,减少水肥和劳动力的投入,获得较高的收益,但也存在对人工管理扰动的模拟难、作物本体信息采集难等问题。     

未确知拓扑空间的连通性

在２个未确知拓扑空间之间的未确知连续函数的基础上,通过未确知同胚函数的定义,未确知子集的分离的定义,确定未确知拓扑空间的连通性。给出连通未确知子集的定义和相关的定理;未确知拓扑空间连通性的定义和定理,以及连通分支的定义、定理。     

圆管与圆锥斜交相贯线展开图分析

讨论应用数值解法建立锥管斜交相贯的相贯线展开曲线数学模型，并进行程序设计。通过计算机计算，自动生成相贯线展开图。