同轴送粉激光成形中粉末与激光的相互作用

详细介绍了同轴送粉激光成形过程中，金属粉末与激光束相互作用时间的计算方法。在ANSYS软件平台上，建立了金属粉末穿越激光束过程中粉末温度场的计算模型。系统计算了不同颗粒大小316L不锈钢粉末与不同功率激光束相互作用后的温度。在此基础上，计算了金属粉末与激光束的能量交换及金属粉末落入激光熔池后与激光熔池的能量交换。计算结果表明，在激光束直径为3mm条件下，316L不锈钢粉末穿过功率大于1000W的激光束后，所有尺寸金属粉末均被熔化，即金属粉末以液态进入激光熔池。通过金属粉末与激光束及激光熔池的能量交换计算，可知在激光成形中，约有5％的激光能量用于加热和熔化粉末，而大约95％的激光能量用于激光熔池的形成及由于热传导造成的热量损失

Interaction of the Laser Beam and the Metal Powder Conveyed by Coaxial Powder Feeder

详细介绍了同轴送粉激光成形过程中,金属粉末与激光束相互作用时间的计算方法。在ANSYS软件平台上,建立了金属粉末穿越激光束过程中粉末温度场的计算模型。系统计算了不同颗粒大小316L不锈钢粉末与不同功率激光束相互作用后的温度。在此基础上,计算了金属粉末与激光束的能量交换及金属粉末落入激光熔池后与激光熔池的能量交换。计算结果表明,在激光束直径为3 mm条件下,316L不锈钢粉末穿过功率大于1000 W的激光束后,所有尺寸金属粉末均被熔化,即金属粉末以液态进入激光熔池。通过金属粉末与激光束及激光熔池的能量交换计算,可知在激光成形中,约有5%的激光能量用于加热和熔化粉末,而大约95%的激光能量用于激光熔池的形成及由于热传导造成的热量损失

Securely redundant scheduling policy for MapReduce based on dynamic domains partition

MapReduce现有调度策略无法实现云环境中多租户作业的安全隔离。提出一种基于动态域划分的安全冗余调度策略：通过引入冲突关系、信任度、安全标签等概念，建立一种动态域划分模型，以将待调度节点划分为与不同租户作业关联的冲突域、可信域或调度域；结合冗余方式，将租户作业同时调度到其可信域节点和调度域节点(但不允许为其冲突域节点)，通过二者执行环境和部分计算结果的一致性验证决定是否重新调度。实验分析了其有效性和安全性。 MapReduce’s current scheduling policies could not ensure the isolation between multi-tenant Tasks in the cloud. A securely redundant scheduling policy based on dynamic domains partition was proposed. First, a kind of dy-namic domain partition model was introduced in this policy. Based on the node’s current belief, security labels with the conflict relationship between tenants, a computing node was partitioned into the conflict domain, trusted domain or schedulable domain in this model. Second, through redundantly computing, two copies of each Task were assigned re-spectively to its trusted domain node and its schedulable domain node (but not allow for its conflict domain node) in this policy. And the integrity of the two nodes’execution environments and the consistence of their results on a small part of original input data were verified. Accordingly, it decided whether the schedulable domain node was trusted. Finally, the performance and security analysis in the prototype show its effectiveness.MapReduce's current scheduling policies could not ensure the isolation between multi-tenant Tasks in the cloud. A securely redundant scheduling policy based on dynamic domains partition was proposed. First, a kind of dynamic domain partition model was introduced in this policy. Based on the node's current belief, security labels with the conflict relationship between tenants, a computing node was partitioned into the conflict domain, trusted domain or schedulable domain in this model. Second, through redundantly computing, two copies of each Task were assigned respectively to its trusted domain node and its schedulable domain node (but not allow for its conflict domain node) in this policy. And the integrity of the two nodes' execution environments and the consistence of their results on a small part of original input data were verified. Accordingly, it decided whether the schedulable domain node was trusted. Finally, the performance and security analysis in the prototype show its effectiveness

Firmware protection method for wireless meter reading module of electric energy meter

本发明涉及一种用于电能表无线抄表模块的固件保护方法。计算关键代码段的CRC校验和，与预设的校验和比较如果计算所得的结果和程序中预设的不一致，则终止运行；如果计算所得的结果和预设的一致，则读取无线抄表模块的硬件特征信息；使用预定的计算方法计算特征信息，产生特征密钥；如果固件中预置的密钥写入方法没有被删除，则使用所述密钥写入方法将所述特征密钥写入固件中，将该写入方法删除；如果固件中的密钥写入方法已经被删除，则将产生的特征密钥与固件中的特征密钥比较，密钥一致则继续运行，否则终止运行。本发明方法简单易行，在利用硬件特征数据保证程序唯一性的同时，也保护了程序的完整性和合法性，使固件不易被破解

重组人凝血因子Ⅷ治疗411例中重型血友病A患者的抑制物产生及安全性的回顾性分析

目的:分析国内血友病A患者接受第3代重组人凝血因子Ⅷ(FⅧ)替代治疗后FⅧ抑制物产生和相关安全性情况。方法:对411例重型和中型血友病A患者进行回顾性分析。结果:411例血友病A患者均为男性,46例仅接受百因止治疗,包括18例既往未接受过FⅧ治疗(PUP)和28例既往接受过FⅧ治疗(PTP);365例接受百因止与其他FⅧ制剂治疗,包括9例PUP和356例PTP。411例患者中13例(3.2%)报告了抑制物产生阳性,包括27例PUP中的3例(11.1%)和384例PTP中的10例(2.6%)。在365例接受百因止与其他FⅧ制剂治疗的患者中,分别有7例(1.9%)、36例(9.9%)和11(3.0%)报告了乙肝表面抗原阳性、乙肝表面抗体阳性和丙肝表面抗体阳性,同时有9例(2.5%)和1例(0.3%)报告了人类免疫缺陷病毒抗体和梅毒螺旋体抗体阳性。在46例仅接受百因止治疗的患者中,未见病毒学阳性结果。结论:中国血友病A患者接受百因止替代治疗总体安全且耐受性良好,抑制物发生率较低