论半结构化数据的模型集成

半结构化数据是网络数据的重要形式,是一种特殊的数据资源,它作为新资源为新技术产生开辟了新领域,同时也为传统数据处理技术研究提出了新方向。     

协同虚拟样机的工作流时间管理研究

协同虚拟样机的工作流管理能支持和控制分布异地的多个集成化产品开发团队的动态协同设计过程,实现对虚拟样机协同设计过程的有效管理,对改善虚拟样机工作效率、提高工作质量起着重要的作用。重点对虚拟样机的工作流时间管理进行了研究,通过对路由结构的分析,采取工作流松弛时间分配方法,调整部分弱不满足时间约束至可满足状态,使更多的工作流实例满足截止期限,降低了异常触发频率,节省了处理开销,提高了运行效率。     

高效絮凝菌的鉴定及絮凝特性研究

从含油废水曝气池活性污泥中筛选6株具有絮凝特性的菌株,命名为:F1、F2、F3、F4、F5、F6.为了研究絮凝菌的分类及絮凝特性,采用16SrDNA序列方法对6株絮凝菌进行鉴定分类;利用紫外扫描光谱与红外光谱扫描光谱分析絮凝活性成分.鉴定结果表明:6株絮凝菌分别与芽孢杆菌属、农杆菌属、库克菌属聚为一类,特征基本一致,具有99%同源性;絮凝测定结果显示,絮凝率在69%以上,其中F2、F3、F5、F6的絮凝率高于80%.将上述4株絮凝菌进行双菌混合培养试验,结果显示:F2和F6组合絮凝活性最佳,均优于各单菌,絮凝剂的有效成分为多糖类物质.     

基于改进B分布自适应窗长时频分析的伪码调相-载波调频复合引信信号的参数提取研究

研究了基于改进B分布的自适应窗长时频分析的理论及其实现方法,利用该方法对伪码体制复合引信信号进行脉冲内特征分析,这些信号具体包括伪码调相信号、伪码调相与正弦调频复合信号、伪码调相与线性调频复合信号.仿真结果表明,在信噪比为3 dB时,利用该种自适应窗长时频分析技术,不但可以提取载频调制的特征信息,而且能够有效提取相位突...     

单圈绝对式电子经纬仪测角信号处理

为实现快速、高精度角位移测量,提出了一种单圈绝对式电子经纬仪测角信号处理算法。只需刻画脉冲左右边沿在阈值附近各2个采样点就可以快速估计出脉冲宽度和脉冲中心坐标;对现有文献细分方法进行改进,给出了基于多组刻画脉冲中心求解高分辨力细分角的公式;并对算法时间复杂度和抗噪声性能分别进行了分析与仿真。实验结果表明,本方法在水平方向上测角误差标准差仅为2.5″,平均每秒钟可测角输出25次,具有实现简单、只需较少计算量就可以获得较高测量精度的优点。研究结果可以为单圈绝对式电子经纬仪、全站仪提供一种新的测角信号处理实用方法。     

不同干燥方式对白玉菇品质的影响

以新鲜白玉菇为原料,通过测定其营养成分、色泽、复水比、感官评定、质构测定以及微观结构测定,研究热风变温干燥,真空冷冻干燥,红外恒温干燥3种干燥方式对其品质的影响。结果表明:相对于热风变温干燥组和红外恒温干燥组,真空冷冻干燥组的白玉菇样品样品营养成分最高,蛋白质和多糖含量分别为221.16mg/g和74.25mg/g。同时,真空冷冻干燥组的复水比、色泽、感官评定和质构特性最好,电镜结果表明真空冷冻干燥组的样品组织结构完整性最好。综合比较,真空冷冻干燥是3种干燥方式中最理想的干燥方式。     

Interface engineering towards low temperature in-situ densification of SOFC

Electrolyte densification, which is often realized by high temperature sintering (i.e. >1000 °C), is an essential process for solid oxide fuel cell (SOFC). However, it is hard to achieve interfaces with high ionic conductivity because the interfaces between particles would be greatly eliminated during the sintering process. In this study, a novel interface engineering method is designed basing on capillary action to densify the electrolyte and at the meantime achieve ionic conductive interfaces at low temperature. A porous electrolyte layer is found to become dense during fuel cell operation when alkali metal hydroxide (AMH) is added to the NiO anode. The observation of improved open circuit voltage (OCV) indicates gas leakage has been eliminated after AMH modification. Raman images confirm that AMHs can be absorbed into the electrolyte layer when the operating temperature is higher than the melting point of AMH. In addition, using a lithiated metal oxide (i.e. LiNiO₂) as the anode, cell performance is further improved. EIS proves that the existing of AMH in the cell may affect gas diffusion in the electrode, but it significantly reduces ohmic resistance due to better interfacial ionic conductivity of the electrolyte. This in-situ electrolyte densification method not only enables us to simplify fuel cell fabrication process and lower the fabrication temperature but also provides ways for maintaining interface conductivity.     

Li/SO2 rechargeable cells containing added bromine

Hermetically sealed “C” sized Li/LiAlCl₄·6SO₂/carbon cells containing bromine or bromide as additives have been prepared and galvanostati