基于 A* 算法与自适应分片的大规模最优路径规划

路径规划引擎是在线地图系统中一个至关重要的部分,静态路径规划算法是重中之重。现有的对A*算法的改进主要是通过预处理算法,对路网数据进行静态分层预处理,其效率过低。文章提出了一种自适应分层的思想,同时对A*算法的启发式函数进行改进,引入了方向引导函数,使得A*算法在日常路网上的可用性有了较大的提高。实际的路网实验表明,提出的算法的搜索效率、效果均优于同类算法,与标准层次A*算法相比,文章算法的搜索空间降低为原来的42%,搜索时间仅为原来的13%。     

无人机在反舰导弹中继制导中的关键问题研究

针对反舰导弹超视距攻击的问题,提出了利用无人机为导弹提供中继制导的方法,并分析了所涉及的引导、定位、航路规划和目标识别等关键问题,给出了初步的解决方法,为作战应用提供了参考。     

清纱器导光件注射模设计

针对导光件在试生产时存在导光效果差、导光柱中有气泡等缺陷,提出新的设计方法,通过弹簧侧向分型、斜导柱内侧抽芯,采用阶梯分型面,成功地解决了导光件在试生产阶段存在的缺陷,保证了产品质量,降低了生产成本,提高了生产效率。     

高速公路连拱超浅埋隧道下穿104国道施工技术

宁杭高速公路梯子山隧道为大跨度、超浅埋、连拱隧道,且工程下穿国道,施工设计采用暗挖、三导洞先行的施工方案,即先开挖左、中、右三导洞,做临时支护,再施工中隔墙,然后开挖主洞,主洞开挖也分左右洞,并及时浇筑仰拱以形成封闭结构,最后二次衬砌,以防拱顶下沉.实践证明,工程施工方案可行,为类似隧道施工提供了经验借鉴.     

粉煤灰加碱煅烧熔融水热法合成4A沸石

文章介绍了电厂粉煤灰加碱煅烧熔融后,在一定条件下水热法合成4A型沸石分子筛;同时加入导向剂,通过改变导向剂的老化时间和加入量探索对合成4A沸石的影响。实验研究表明,粉煤灰加碱煅烧熔融后,在水热合成沸石时加入一定量导向剂,缩短了沸石的晶化时间,很好地改善了产品的粒度分布和团聚程度,提高了产品纯度,降低了产品结晶粒度,合成出高纯度的4A沸石。     

Scanning transmission ion microscopy of polycarbonate nanocapillaries

Polycarbonate membranes containing statistically scattered heavy ion track nanocapillaries have been studied by scanning transmission ion microscopy (STIM) method. The geometry of the samples was characterized by pore diameters of about 172 nm and by 30 μm membrane thickness. The porosity has to be relatively low in order to avoid too many overlapping capillaries. The transparency of the sample is reduced by changing its tilt angle to the beam. While the acceptance angle for transmission of a single capillary is below 0.3°, the STIM results have showed that the angular spread was about 1° full width at half maximum (FWHM). This indicates that the capillaries are not perfectly parallel, i.e. the capillary directions have a finite angular spread.Our results are important for the recent use of these types of insulator membranes in ion guiding studies, and the related potential applications.     

Electron transmission through a microsize tapered glass capillary

Transmission of 500, 800, and 1000 eV electrons through a tapered Borosilicate glass capillary was studied for the first time. Interestingly, almost no transmission was seen for the lowest energy (500 eV), while electrons were transmitted for the higher two energies. The time (charge) dependence of the electron transmission intensity at 1000 eV was examined for tilt angles up to 1.0° with sudden bursts of elastic transmission at the lower sample tilt angles occurring. No stable equilibrium was seen even at long charge times for the measured tilt angles. The results reveal unique features of electron transmission through tapered glass capillaries compared to what has been observed for highly charged ions and electrons so far.     

用于迷宫屏蔽计算的蒙特卡罗减方差方法研究

本文应用多种减方差技巧提出了强迫指向自动重要抽样（FPAIS）方法,并在MCNP5程序平台实现了该方法。采用该方法对1个多折迷宫算例进行了模拟计算,计算结果与MCNP5程序的直接模拟、DXTRAN球、点通量3种方法的结果进行了比对。基于此算例对FPAIS方法进行了引导面设置和粒子数敏感性分析。结果表明,FPAIS方法在保证一定计算精度的前提下,比其他3种方法的FOM提高2~3个量级,且该方法对引导面设置不敏感、可用性强,对于迷宫屏蔽计算是一种准确、高效的解决方案。     

设备闸门提升与导向装置运行特性仿真分析

对核电厂设备闸门提升与导向装置在设备闸门封头开启与关闭过程中的运动特性进行了分析研究,该研究借助动力学仿真软件ADAMS展开,分别对提升与导向装置可能出现的同步提升操作和不同步提升操作两种工况进行了仿真分析。分析结果表明:在同步提升操作工况下,设备闸门封头两侧导向箱位移一致,提升与导向装置不会产生卡滞;在不同步提升操作工况下,设备闸门封头两侧导向箱最大允许高度差为54 mm,否则提升与导向装置将产生卡滞。     

提高薄板坯连铸生产线钢包自动开浇率的生产实践

介绍了钢包自动开浇率对薄板坯钢水纯净度的影响及影响钢包自动开浇率的各种因素,分析了引流砂质量、引流砂加入方式、上水口情况及钢水在钢包中停留时间对钢包自动开浇率的影响。通过采取一系列有效措施,唐钢薄板坯生产线钢包自动开浇率达到了98．5％以上。