Unsymmetrical Quantum Key Distribution Using Tripartite Entanglement

An unsymmetrical quantum key distribution protocol is proposed, in which Greenherger-Horne-Zeilinger （GHZ） triplet states are used to obtain the secret key. Except the lost qubits due to the unperfectness of the physical devices, the unsymmetrical characteristic makes all transmitted qubits useful. This leads to：an excellent efficiency, which reaches 100% in an ideal case. The ＇security is studied from the aspect of information theory. By using the correlation of the GHZ tripartite entanglement state, eavesdropping can be easily checked out, which indicates that the presented protocol is more secure.     

不对称苯并菲盘状液晶的合成及取代基对介晶性的影响

合成了一系列新型含间位二硝基苯甲酸酯不对称苯并菲盘状液晶化合物2-(3,5-二硝基苯甲酰氧基)-3,6,7,10,11-五烷氧基苯并菲(3a～3f). 通过偏光显微镜(POM)和差示扫描量热计(DSC)对其介晶性进行了研究. 结果显示: 此类化合物有高的清亮点, 稳定的六方柱状相以及较宽的介晶相范围, 且随着软链碳原子数的增加, 化合物的熔点和清亮点均出现下降趋势, 但六方柱状相的有序性却没有发生很明显的变化. 同时通过与其它三类苯并菲盘状液晶2-苯甲酰氧基-3,6,7,10,11-五烷氧基苯并菲(4a～4f), 2-二茂铁甲酰氧基-3,6,7,10,11-五烷氧基苯并菲(5a～5f), 2,3,6,7,10,11-六烷氧基苯并菲(6a～6f)的对比研究, 探讨了酯基, 强吸电子基团, 以及取代官能团体积对介晶性的影响. 证实了苯并菲化合物中分子结构小的变化将引起介晶性大的改变.     

含苯并五元环方酸衍生物的二阶非线性光学性质的理论研究

利用从头算HF/6-31G*方法对用苯并五元环取代的方酸衍生物体系SQ1～SQ15进行几何构型优化和电子结构计算. 以优化后的构型为基础, 应用ZINDO方法计算电子光谱. 同时应用从头算CPHF/6-31G*方法和半经验FF/AM1, FF/PM3, FF/MNDO等有限场方法计算了分子的二阶非线性光学系数β_μ. 研究几何结构、电子结构和前线分子轨道能与β_μ之间的关系, 为设计性能优良的有机非线性光学材料提供理论指导, 并对这四种计算方法的结果进行了比较.     

不对称-NO等取代2,4-二苯基方酸的非线性光学性质的FF/AM1研究

对-NH2,-NO和NO2取代的2,4-二苯基方酸采用量子化学半经验AM1方法进行优化,在优化稳定构型的基础上计算了各体系的电子光谱,并通过FF/AM1方法计算了各体系的一阶分子超极化率(β ijk)和二阶分子超极化率(γ ijkl).计算结果表明,各体系均有非常大的βijk和γijkl,其最大值分别可达-2.406×10-26 C*m和1.845×10-24 C*m.     

苯并咪唑-噻碳菁染料的合成及性质

2-(β-苯胺基乙烯基)-5-R-3-(γ-磺酸丙基)苯并噻唑内铵盐同5,6-二氯-1-乙基-2-甲基-3-(γ-磺酸丙基)苯并咪唑内铵盐在乙酸酐-三乙胺存在下缩合生成苯并咪唑-噻碳菁染料, 合成并表征了七个不对称苯并咪唑-噻碳菁, 其中六个为新化合物. 测试了它们的紫外可见吸收光谱和荧光发射光谱, 结果表明 不对称染料的Brooker偏离值与取代基R的Hammettσ~m常数呈线性关系. 取代的苯并噻唑杂环碱性顺序: 4,5-苯并＞5-CH~3＞5-H＞5-OCH~3＞5-F＞5-Cl＞5-CF~3 .     

新型多臂方酸菁化合物的合成及光谱性质

合成了引入多甘醇醚链的５－Ｎ，Ｎ－双（２－羟乙基）胺基－１，３－间苯二酚及其衍生物，使之与方酸发生缩合反应，获得了７种新型多臂方酸菁化合物，研究了它们的光谱性质     

手性不对称脲石胆酸分子裂缝对阴离子的识别研究

以石胆酸为spacer,手性不对称脲为侧链,通过三光气桥连,合成了新的手性不对称脲分子裂缝4 a-4d。这些新化合物的结构经IR,1H NMR,MS和元素分析所证实。利用紫外光谱滴定法考察了其与卤素阴离子的识别性能。结果表明,分子裂缝4a-4d对所考察的卤素阴离子均具有良好的识别能力,主客体之间形成1:1型超分子配合物,识别作用的主要推动力为氢键。     

Reduction of Diaryldiselenides by System of Cp2TiCl2/ BuiMgBr/ THF and Its Application in Synthesis of Unsymmetrical Diaryl Selenides

Inorganicseleniumchemistry,diaryldiseIenidesareimportantintermediateduetotheirstabiIityaganistairandwater.Whentheyarereduced,thenucleophilicseIenoatescanbeobtained.TherehavebeenseveralmethodsforthereductionofdiselenidessuchasviaNaBH".SmI==.thereductionsystemofSe,H=OandCO',hydrazine-sodiummethanoIate'andSm/HgCl='.Inthispaper,wereportthereductionsystemofCp=TiCl,/Bu'MgBr/THFanditsapplicationinsynthesisofunsymmetricaldiarylselenides.TitanocenehydridelCp,TiH]'wasderivedfromthereactionof…     

The electrophoretic effect for the case of electrolyte mixtures

The ionic electrophoretic effect for solutions of mixed electrolytes of any type is calculated. The calculation is based on the well-known treatment due to Chen with the same distance of closest approach for all the ions in solution. The improved iterative method used for the relaxation-field treatment is applied. For the latter the electrophoretic velocity results are derived to the second iteration in the perturbation method.     

Modeling of Aqueous 3–1 Rare Earth Electrolytes and Their Mixtures to Very High Concentrations

A simple modification to the Pitzer ion–interaction model has been presented for osmotic and activity coefficients of aqueous solutions of highly soluble and highly unsymmetrical electrolytes and their mixtures. The equations extending to the C⁽³⁾ parameter enable the literature osmotic and activity coefficients of aqueous rare earth nitrates, perchlorates and chlorides at 298.15 K to be represented accurately from infinite dilution to maximum saturation or supersaturation concentrations available. The ionic interactions have also been investigated from the isopiestic measurements on aqueous mixtures Y(NO₃)₃–La(NO₃)₃, Y(NO₃)₃–Pr(NO₃)₃, Y(NO₃)₃–Nd(NO₃)₃, La(NO₃)₃–Pr(NO₃)₃, La(NO₃)₃–Nd(NO₃)₃ and Pr(NO₃)₃–Nd(NO₃)₃ at 298.15 K to near saturation, and the simple modification can represent the new measurements within experimental uncertainty over the full concentration range. In addition, the Zdanovskii-Stokes-Robinson model or partial ideal solution model is obeyed by all the mixtures within isopiestic accuracy, which is consistent with the nature of rare earth elements.