Detecting the possibility of a type of photon number splitting attack in decoy-state quantum key distribution

The existing decoy-state quantum key distribution (QKD) beating photon-number-splitting (PNS) attack provides a more accurate method to estimate the secure key rate, while it still considers that only single-photon pulses can generate secure keys in any case. However, multiphoton pulses can also generate secure keys if we can detect the possibility of PNS attack in the channel. The ultimate goal of this line of research is to confirm the absence of all types of PNS attacks. In particular, the PNS attack mentioned and detected in this paper is only the weaker version of PNS attack which significantly changes the observed values of the legitimate users. In this paper, under the null hypothesis of no weaker version of PNS attack, we first determine whether there is an attack or not by retrieving the missing information of the existing decoy-state protocols, extract a Cauchy distribution statistic, and further provide a detection method and the type I error probability. If the result is judged to be an attack, we can use the existing decoy-state method and the GLLP formula to estimate the secure key rate. Otherwise, the pulses with the same basis received including both single-photon pulses and multiphoton pulses, can be used to generate the keys and we give the secure key rate in this case. Finally, the associated experiments we performed (i.e., the significance level is 5%) show the correctness of our method.     

酪氨酸-钼(Ⅵ)的荧光猝灭法测定酪氨酸

本文基于钼 (Ⅵ )对酪氨酸的荧光具有猝灭的特性 ,拟订了一种测定酪氨酸的方法 ,该方法激发波长为 2 78nm ,发射波长为 30 5nm。线性范围为 0 0 1～ 14 4μg·mL-1,检测限为 6ng·mL-1,对于 0 18μg·mL-1的酪氨酸测定 10次的相对标准偏差为 1 13%。用该方法测定了啤酒及葡萄酒中酪氨酸的含量     

羧基配位结构——共面与非共面

综述了羧酸配合物中出现的羧基的共面配位形式，并着重介绍一种新发现的羧基配位形式———非共面配位。     

三个异质同晶喹啉-8-氧醚乙酸配位聚合物的合成、结构及磁性质

本文通过溶剂热反应合成了3个异质同晶的配位聚合物[Ni(8-qoac)Cl]n(1,8-Hqoac=喹啉-8-氧醚乙酸),[Fe(8-qoac)Cl]n(2)和[Mn(8-qoac)Cl]n(3)。单晶结构分析表明,这些配合物结晶在Pbca空间群中,其中八面体配位的金属离子首先被2个氯离子桥连形成1个双核结构,双核单元再通过4个反-反配位模式的羧酸根与4个相邻的双核单元连接,形成1个以双核为节点的(4,4)网二维层状结构。磁学表征发现化合物1表现出类自旋倾斜的磁行为,而2和3只表现出简单的反铁磁行为,表明了金属离子的各向异性等特点对磁学行为会产生重要的影响。     

溶胶-凝胶法制备0.94(K_(0.5)Na_(0.5))NbO_3-0.06LiNbO_3陶瓷粉体

以五氧化二铌和钾、钠及锂的碳酸盐为原料，以柠檬酸为螯合剂、乙二醇甲醚为添加剂，采用溶胶-凝胶法制备了0．94（K0．5Na0.5）NbO3-0．06LiNbO3无铅压电陶瓷粉体．研究了各种工艺条件对前驱体溶液和凝胶形成的影响，利用TG—DTA、XRD及SEM等技术研究了凝胶焙烧温度、焙烧粉体的粒度及晶形状况．研究结果表明：柠檬酸与金属离子的物质的量比[n（CA）／n（Mn^＋）]及pH值是影响前驱体溶液和凝胶形成的主要因素．用溶胶-凝胶法合成KNLN6粉体，具有合成温度低，合成的粉体晶粒细小，分散均匀等优点．     

高容量分子印迹聚合物的制备及表征

以α-甲基丙烯酸和4-乙烯基吡啶为二元功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,氯仿为致孔剂用本体聚合法合成了甲磺隆分子印迹三元共聚物,并用固相萃取方法对该聚合物在有机相及水相中的键合容量进行了评价,与同一条件用单一单体合成的聚合物的键合容量进行了比较,发现该三元共聚物在有机相中每克聚合物可键合20.5 mg的甲磺隆分子,水相中每克聚合物可键合19.2 mg的甲磺隆分子.采用核磁滴定对三元共聚体系的预聚溶液中分子作用力进行了研究,发现三元体系的预聚溶液中分子间作用力引起的位移变化幅度比二元体系的预聚溶液的变化大很多,这说明形成了更强的作用位点.     

Syntheses, Characterization and Equilibrium between Mono-and Aqua-bridged Dicobalt(II) Complexes. A Structural Model for Methionine Aminopeptidase

IntroductionIthasbeenfoundfrequentlyinhydrolasesthattwoormoremetalionsareassembledinverycloseproximitytothecarboxylatesidechainsofaminoacidresiduesatenzymeac tivesitestocarryouttheirbiologicalfunctions.1Metalsem ployedinhydrolasesincludemagnesium ,manganese ,iron ,cobalt,nickelandzinc .1Onekindofhydrolases,themethio nineaminopeptidasefromE .coil (EcMAP) 2 andPyrococcusfuriosus (PfMAP) 3bothrequiretwoCo2 + ionsfortheiractiv ity ,whereastheirstructuresaredifferent.Thediversestructuresandmet…     

改革实验教学 培养创新人才

化学是一门以实验为基础的自然科学,学生从实验现象中去认知事物,并通过自己的操作来培养各种能力,进而促进思维的发展和综合素质的提高.……     

三种二酸Cd(Ⅱ)混配聚合物的结构与荧光性质

本文以刚性间苯二酸(IP),对苯二酸(TP)及柔性丁二酸(SU)为桥联配体,溶剂热法合成了3个配合物[Cd(TP)(DPQ)(H₂O)]_n (1),[Cd(IP)(DPPZ)]_n (2)和[Cd(SU)(DPPZ)]_n(3)(DPQ=吡嗪[2,3-f][1,10]菲咯啉,DPPZ=二吡啶[3,2-a∶2′,3′-c]并吩嗪)。通过X射线单晶衍射分别测定了它们的结构。3个配合物均为单斜晶系,空间群分别为P2₁/c(配合物1和3)和C2/c(配合物2)。配合物荧光性质的表征表明,采用刚性二酸有利于配位聚合物荧光的增强。