Quantum broadcast communication and authentication protocol with a quantum one-time pad

A quantum broadcast communication and authentication protocol with a quantum one-time pad based on the Greenberger–Horne–Zeilinger state is proposed. A binary string is used to express the identity of the receiver, which is encoded as a single sequence of photons. The encoded photon sequence acts as a detection sequence and implements authentication. An XOR operation serves as a one-time pad and is used to ensure the security of the protocol. The binary string is reused even in a noisy channel and proves to be unconditionally secure. In contrast with the protocols proposed by Wang et al. [Chin. Phys. 16 1868(2007)] and Yang et al. [Chin. Phys. B 19 070304(2010)], the protocol in this study implements the identity authentication with a reusable binary string; no hash function or local unitary operation is used. The protocol in this study is also easier to implement and highly efficient without losing security.     

镧对Al-Ti-C晶粒细化剂显微组织与细化性能的影响

采用自蔓延＋熔铸法制备Al-Ti-C晶粒细化剂。通过光学显微镜（OM）、透射电镜（TEM）、扫描电镜（SEM）、X射线衍射仪（XRD）和能谱分析（EDS）等手段，研究了稀土镧对晶粒细化剂的组织结构和细化性能的影响。结果表明：镧极大地提高了石墨在铝熔体中的润湿性；镧的加入改变了TiAl3和TiC的形貌、数量和分布，使块状TiAl3和非团簇状TiC均匀分布在α—Al基体上，从而对工业纯铝产生优异的晶粒细化效果。     

REAlTiBP多元复合变质ZL117铝硅合金

研究了REAlTiBP多元复合变质剂对ZL117合金组织和性能的影响。经变质处理后 ,ZL117合金中的初晶硅平均尺寸由变质前的 2 5 0变为 3 0 μm ,室温抗拉强度由变质前的 168变为 2 45MPa ,高温 (3 0 0℃ )抗拉强度由变质前的 88变为 12 0MPa ,冲击韧性由变质前的 6.5提高到16.5J·cm- 2 ,耐磨性由变质前的 0 .0 0 80下降到 0 .0 0 42g ,变质效果良好。还介绍了变质剂同时细化初晶硅和共晶硅的双重作用机制及良好的重熔性和长效性     

稀土、钾、钠微合金化铁素体基体蠕墨铸铁玻璃模具材质的研究

介绍了稀土、钾、钠微合金化蠕墨铸铁玻璃模具材质的组织特点，探讨了铸造工艺对模具本体双层石墨形成的影响，总结了稀土残留量和钾、钠微合金化元素与模具材质力学性能和高温性能之间的关系。结果表明：这种模具材质具有较好的尺寸稳定性，较高的抗氧化疲劳能力，其使用寿命是原铸铁模具使用寿命的5倍，达到62万次／模。具有很好的应用推广价值。     

AHP的检验方法及其比较分析

介绍了目前较有影响的三种ＡＨＰ一致性检验算法,并对其作了比较分析,最后提出了一种检验算法的选择准则