面向开发过程的产品数据管理技术研究

产品开发过程中产品数据的完整性、正确性、一致性管理,对缩短产品开发周期、提高质量有重要意义.针对此问题,分析了产品开发过程中xBOM的内涵;研究了EBOM、PBOM、MBOM(核心BoM)的逻辑关系与形成过程,建立了以三种核心BOM为基础的SSPD产品数据管理模式;阐述了xBOM多视图数据转换实现方法.最后,将这种产品数据管理技术应用到飞机研制中验证其实用性.     

生活垃圾焚烧发电锅炉的稳定燃烧控制与调整

垃圾焚烧发电锅炉的稳定燃烧控制与调整是运行中的重点和难点。如何实现稳定燃烧提高垃圾燃烧热效率是垃圾发电产业的研究课题之一。本文以某炉排层燃垃圾焚烧发电锅炉为例,从垃圾燃料特性、垃圾料层厚度、一次风和二次风等方面阐述垃圾发电锅炉的稳定燃烧控制与调整,为垃圾焚烧发电锅炉的优化运行提供参考。     

捞渣机轴承损坏分析及处理

对600 MW火电机组锅炉捞渣机导向轮轴承、张紧轮轴承损坏原因进行了分析及解体检修,针对轴承设计选型不当和安装检修工艺不佳等问题,采取用圆柱滚子轴承代替普通深沟球轴承的解决方法,并给出了密封差和润滑不当的处理办法.改进后,提高了主要设备的运行可靠性,取得了较好的经济效益.     

Effect of different preparation methods on structure and properties of chitosan/poly-lactic acid blend porous membrane

Two kinds of blend solutions were used to prepare chitosan (CS)/poly-l-lactic acid (PLLA) blend membranes by the immersion precipitation phase inversion method. CS/PLLA blend membrane was fabricated by mixing CS-acetic acid solution and PLLA-dioxane solution, chitosan powder (CSP)/PLLA blend membrane was fabricated by mixing CSP and PLLA-dioxane solution. The membrane structure and properties were characterized by Scanning Electron Microscope, Wide Angle X-ray Diffraction, porosity, water vapor transmission rate and swelling property. The results showed that CS content in CSP/PLLA blend membrane was nearly 70 times higher than in CS/PLLA blend membrane. Two types of blend membranes took on an unsymmetrical structure with a skin layer, a microvoid sub-layer and a porous bottom surface. But CSP/PLLA blend membrane exhibited a porous skin layer, while the skin layer of CS/PLLA blend membrane was impact. The WAXD analysis revealed that PLLA and CS were amorphous in CS/PLLA blend membrane, while there were PLLA and CS crystalline in CSP/PLLA membrane, which resulted in the higher initial modulus of CSP/PLLA blend membrane. The porosity, WVTR and equilibrium swelling (Q _eq ) of CSP/PLLA blend membrane were higher than that of CS/PLLA blend membrane, especially Q _eq . The swelling kinetics results showed that in the initial swelling, water molecules diffusion followed Non-Fickian diffusion for CS/PLLA blend membrane swelling, and the swelling of CSP/PLLA blend membrane fitted with the relaxation diffusion model. The swelling kinetics studies for whole swelling revealed that the swelling degree and the initial swelling rate of CSP/PLLA membrane were significantly higher than that of CS/PLLA membrane, although the total swelling rate of CSP/PLLA blend membrane decreased lightly.     

开放Agent社会的框架模型研究综述

开放Agent社会是一种多Agent系统,其中的Agent是由不同所有者开发的,具有不同的目的和利益。Agent的异构性、冲突的个体目标以及可能与系统规范的不一致性是这种系统的主要特征。因此,这种系统的活动需要一个框架模型进行管理,以进行协调控制和引导全局行为的发生,同时保证个体成员的自主性。本文对开放Agent社会的框架模型的研究和应用现状进行了归纳总结,分析了几种有代表性的理论框架和软件实现。最后,提出了现有的问题和未来的研究方向。     

3,5-二甲基-4-溴碘苯和2,6-二甲基-4-溴碘苯的合成

二甲基对溴碘代苯是带有两种不同卤素基团的芳香族有机合成中间体。2,6-二甲基苯胺在过碳酸钠作用下,于45~50℃与碘反应1 h,得到2,6-二甲基-4-碘苯胺,收率42.5%。2,6-二甲基-4-碘苯胺在-5~0℃下进行重氮化,进一步与溴化亚铜发生Sandm eyer反应,得到3,5-二甲基-4-溴碘苯,收率31.5%。2,6-二甲基苯胺室温下与六亚甲基四胺溴络合物反应30 m in,得到2,6-二甲基-4-溴苯胺,收率62.0%。2,6-二甲基-4-溴苯胺在-5~0℃进行重氮化,与K I反应,得到2,6-二甲基-4-溴碘苯,收率33.1%。通过熔点、红外光谱和核磁共振氢谱对中间体2,6-二甲基-4-碘苯胺、2,6-二甲基-4-溴苯胺以及最终产物3,5-二甲基-4-溴碘苯和2,6-二甲基-4-溴碘苯进行了表征。     

CO2 laser post-treatment of sol-gel-derived Y3Al5O12:Ce phosphor ceramic powders

Cerium-doped yttrium aluminum garnet (Y₃Al₅O₁₂:Ce, YAG:Ce) was prepared using a sol-gel method and then fired for CO₂ laser post-treatments. Phase transformations and formation of impurities were not observed in YAG:Ce after CO₂ laser sintering. The shift of the diffraction peak and the appearance of another Raman peak indicate a more homogeneous distribution of Ce activators and enhanced crystallinity in laser-sintered YAG hosts. Larger spheres (100–200 μm) with tiny crystallites (<10 μm) were observed on the smoother surface in the laser-sintered YAG:Ce, unlike the irregular, porous, and layered powders in the sol-gel-derived YAG:Ce (1–100 μm). Photoluminescence (PL) measurements revealed an emission increase of 180% and a red shift of the emission peak for the laser-sintered YAG:Ce powders compared with the sol-gel-derived powders. Both have comparable thermal PL quenching behavior; however, the YAG:Ce powders with CO₂ laser treatment exhibited a PL efficiency improvement of approximately 4%.     

基于摄像机动态标定的交通能见度估计

为克服雾天能见度检测仪价格昂贵、检测范围小等缺点,该文结合雾天光线传输模型与摄像机几何光学模型提出一种交通能见度估计算法.该算法通过动态标定交通摄像机内外参数来计算路面区域内点到摄像机的距离,利用场景透射率得到大气消光系数并估计交通能见度.首先,算法基于活动图提取感兴趣区域,再根据区域内平均像素拟合曲线是否满足刃边函数对雾天进行识别;其次,通过暗原色先验原理估计交通场景中每一个点的透射率,并且选取道路上4组透射率差值最大的点对摄像机内部参数标定;然后,提取消失点及车道边缘线完成摄像机外部参数动态标定;最后,通过路面上点到摄像机的距离以及相应的场景透射率估计交通场景的能见度.该文将雾天多个交通场景下能见度值计算结果与人工观测、物理仪器测量等方法进行了比较,结果证明了该文方法的有效性与实时性.