基于关联约束网络的定制产品隐式需求激活技术

定制需求到设计参数的映射是实现产品定制设计的首要环节,客户提供的需求往往不能完整体现产品性能、功能、结构等的定制要求,使得设计人员难以获取完整的定制产品设计参数。因此,将定制产品需求分为显式需求、半隐式需求和隐式需求,并根据需求间不同的关联约束关系,建立了定制产品需求的动态关联约束网络。通过关联约束网络到矩阵的映射与需求节点间关联约束强度的计算,构建了定制产品需求关联约束强度矩阵。通过关联约束强度的传递与累加获取需求节点综合活跃度,进行基于关联约束网络的定制产品显式需求到半隐式需求及隐式需求的关联激活,为产品设计参数获取提供完整的定制需求信息。以典型定制产品电梯为例,对所提出的基于关联约束网络的定制产品隐式需求激活技术进行了应用验证。     

锅炉给水泵水轮轴向窜动量的精确调整

阐述了多级离心泵工作原理和锅炉给水泵检修安装工艺,分析了轴向窜动量调整的重要性及存在的问题,采取了改进措施后达到了精确调整的目的。     

通用可调冲模

我公司在烧制大型变压器线圈时,需要一定数量的燕尾扇形绝缘板,见图1。该工件规格范围较大,一般扇形半径在250～1250mm之间变化,弧长在40～200mm之间变化。燕尾槽尺寸相互变化各异,相应模具刃口尺寸也要随之而变。若按各规格尺寸的要求配备模具,不仅数量多,成本高,制造周期也长,而且该模具往往是在冲裁出所需数量的绝缘件后就     

Study on electronic blocking layer of 403 nm GaN-based vertical cavity surface emitting lasers

In order to obtain good optical characteristics in the GaN-based vertical-cavity surface-emitting laser (VCSEL), different kinds of AlGaN electron blocking layers (EBL) were introduced. These were inserted coherently near the active region to limit electron leakage into the p-doped side. The research was conducted by photonic integrated circuit simulator in three-dimensional (PICS3D). The simulated results reveal that an EBL can improve the optical characteristics of a VCSEL effectively. All the advantages are due to a reduction in the electron leakage in the quantum wells. While the voltage of the five-layer EBLs LD is lower than the voltage of the seven-layer EBLs LD, the output power of the two is approximately the same, so the five-layer EBLs is the best choice for comprehensive structure analysis as the epitaxial structure can be grown more easily on it.