摘要：介绍了攀钢热轧带钢厂改造层流冷却中采用的一种新的设计方法———步序控制法.它是在原有的顺序控制方法上的改进,它使程序具有实现更方便、掌握更容易、可读性更强等优点.这种方法可以用来设计复杂系统的梯形图及用于各种型号的PLC.

摘要：苹果无袋栽培是一种旨在替代套袋栽培的新型栽培管理模式。通过优化果树生长环境和调整管理措施,以省略果实套袋的过程,降低生产成本,提高果实品质,促进果业可持续发展。该文综述国内外苹果无袋栽培的研究进展,包括其优势、挑战,以及对未来发展的建议,为推广苹果无袋栽培技术奠定基础。

摘要：简述了望江挑花艺术历史渊源,深入挖掘其文化内涵与艺术特征,融合现代设计理念、技术标准及社会需求,探究其在家具设计中的创新与应用方式。通过提取挑花的图纹元素、材质色彩及针法工艺特征,运用移植、变形及重构等现代设计方法,完成基于传统望江挑花艺术特色的现代家具设计实践,以期推动望江挑花艺术的持续发展与创新。

摘要：With more large-scale scientific computing tasks being delivered to cloud computing platforms, cloud workflow systems are designed for managing and arranging these complicated tasks. However, multi-tenant coexistence service mode of cloud computing brings serious security risks, which will threaten the normal execution of cloud workflows. To strengthen the security of cloud workflows, a mimic cloud computing task execution system for scientific workflows is proposed. The idea of mimic defense contains mainly three aspects: heterogeneity, redundancy, and dynamics. For heterogeneity, the diversities of physical servers, hypervisors, and operating systems are integrated to build a robust system framework. For redundancy, each sub-task of the workflow will be executed simultaneously by multiple executors. Considering efficiency and security, a delayed decision mechanism is proposed to check the results of task execution. For dynamics, a dynamic task scheduling mechanism is devised for switching workflow execution environment and shortening the life cycle of executors, which can confuse the adversaries and purify task executors. Experimental results show that the proposed system can effectively strengthen the security of cloud workflow execution.

摘要：封隔器卡瓦作为井下作业中关键的锚定部件,其性能直接影响井下作业的安全性和效率。本文系统分析了卡瓦几何参数对接触面积、接触应力和剪切应力的影响规律,提出通过优化几何参数(包括牙数、牙顶角、牙倾角、圆心角和咬入深度)提高卡瓦锚定性能的策略。研究采用有限元仿真并结合理论建模,发现增加牙数和咬入深度能显著提升接触面积并降低接触应力;而适当控制牙顶角和牙倾角则有助于降低局部应力集中现象,延长卡瓦的使用寿命。本文的研究成果不仅为封隔器卡瓦的优化设计提供了理论依据和数据支持,还对井下复杂环境中的锚定技术创新具有重要指导意义。

摘要：基于分形算法中的L-Systems算法、Shape Grammar和空间曲面方程理论,提出了一种支持创新的自动化、智能化计算机辅助建筑造型设计方法。通过计算机程序在较短的时间内衍生出多个具有一定分形特征的建筑地坪、墙体及建筑穹顶等三维实体,并保存到构件库中,利用构件库的可扩充性实现了设计知识的积累。建筑设计师依据设计需求,选择构件库中的三维实体,然后进行人工组装,设计完成复杂的建筑造型。以一个建筑造型设计为例,验证了方法的有效性。

摘要：The effect of dynamic recrystallization(DRX)on the microstructure and mechanical properties of 6063 aluminum alloy profile during porthole die extrusion was studied through experiment and *** grain morphology was observed by means of electron backscatter diffraction(EBSD)*** results show that,at low ram speeds,increasing the ram speed caused an increase in DRX fraction due to the increase of temperature and strain *** contrast,at high ram speeds,further increasing ram speed had much less effect on the temperature,and the DRX faction decreased due to high stain *** microhardness and fraction of low angle boundaries in the welding zones were lower than those in the matrix *** grain size in the welding zone was smaller than that in the matrix zone due to lower DRX *** decrease of grain size and increase of extrudate temperature were beneficial to the improvement of microhardness.

摘要：以模拟等效核爆X射线热-力学效应为目标,从能量沉积剖面着手,对给定多能复合谱电子束的入射角度进行了设计计算.给出了不同靶材、不同温度黑体谱X射线的等效设计计算结果.对比表明,该设计方法适用于多种靶材、多种目标X射线的等效设计,并且设计后的电子束能够提高模拟目标X射线的热-力学效应的逼真度.

摘要：在总结前人研究成果的基础上,提出了面向现代机械产品的智能优化设计法.该方法以智能机器为研究对象,以智能控制理论和方法为理论基础,可在设计过程中实现对现代机械产品的工作参数、工作过程、工作状态以及故障诊断等方面进行智能优化.通过对现代机械产品设计特点的具体分析,建立了智能优化设计法的理论结构体系,包括智能优化设计法的含义、研究目标、研究内容、理论基础和特点等内容.以工作在非结构环境下的打磨机器人为例进行了智能优化设计研究,实验结果表明该方法可全面提高产品的智能化程度和设计质量.

摘要：针对某双吸式离心泵流量和扬程达不到设计要求,效率偏低的情况,对该泵内部三维湍流进行了数值模拟,通过对泵内流场和总压变化过程的分析,找出了该泵达不到设计要求的原因,提出了切割叶轮进口以扩大进口面积的改进方案。对改进后的泵内部流场进行了数值模拟,并与改进前泵内流场数值计算结果进行对比,性能预测表明改进后的泵基本达到了设计要求。在此基础上,对改进后的泵进行了实验测试,结果表明上述改进措施是有效的,数值模拟方法为水泵的优化设计提供了有力工具。