两种以Znq2为基体的新型电致发光材料的合成与性能

以8-羟基喹啉为配体的金属配合物是一种性能优良的有机电致发光材料,其中有关8-羟基喹啉铝(Alq₃)研究已有大量报道,8-羟基喹啉锌(Znq₂)研究还有待发展。介绍了两种以Znq₂为基体的新型有机电致发光材料Znq₂(H₂O)₂和(Znq₂)₄的合成方法。用IR、XRD、TG、DTA和荧光测试方法进行表征与分析表明:Znq₂(H₂O)₂和(Znq₂)₄的玻璃化温度(T_g)分别为104.2℃和204.9℃;在161℃下Znq₂(H₂O)₂脱去水分子成为Znq₂,在361℃高温下四聚体(Znq₂)₄裂解为单体Znq₂;Znq₂(H₂O)₂和(Znq₂)₄具有很好的发光性能,在光致发光谱中λ_max分别是505,550nm。     

关于三次素变数方程在算术数列中的解

In this paper, we give a necessary and sufficient solvable condition for diagonal cubic equation with prime variable in arithmetic progressions and the outline of the proof.     

Numerical Study on Left-Handed Materials Made of Ferrite and Metallic Wires

Due to coupling effect, we show that it is difficult to realize the left-handed material by placing metallic wires directly into a ferrite matrix. However by introducing an insulating material round the metallic wires to decouple the direct interaction between the metallic wire and ferrite matrix, we have proposed two microstructures, which are shown by numerical simulation to have negative refractive indexes. The influence of microstructure on the transmission property is also examined.     

Studies on the Intramolecular Inclusion Complexes of Functionalized Calixarenes with CH_3X (X=CN, NO_2)

ＩｎｔｒｏｄｕｃｔｉｏｎＯｎｅｏｆｔｈｅｍｏｓｔａｔｔｒａｃｔｉｖｅｆｅａｔｕｒｅｓｏｆｃａｌｉｘ[4]ａｒｅｎｅｓｉｓｔｈｅｉｒｃｕｐｌｉｋｅｓｔｒｕｃｔｕｒｅ ,ｗｈｉｃｈｗａｓｏｂｓｅｒｖｅｄｂｏｔｈｉｎｓｏｌ ｉｄｓｔａｔｅａｎｄｉｎｓｏｌｕｔｉｏｎ .Ｔｈｅｃａｖｉｔｙｄｅｆｉｎｅｄｂｙｔｈｅｃｏｎｅｃｏｎｆｏｒｍｅｒｏｆｔｈｉｓｍａｃｒｏｃｙｃｌｅｗａｓｅｘｔｅｎｓｉｖｅｌｙｅｍｐｌｏｙｅｄａｓａｂｉｎｄｉｎｇｓｉｔｅｆｏｒｔｈｅｒｅｃｏｇｎｉｔｉｏｎｏｆｎｅｕｔｒａｌｇｕｅｓｔｓｈａｖｉｎ…     

橙皮素A的NMR研究

橙皮素A是从中药北沙参(Glehnia littoralis Fr. Schmidt ex Miquel)的正丁醇萃 取物中分离得到的一种8-O-4′-型异木脂素苷类化合物. 通过化学方法和波谱分析鉴 定了该 化合物的结构. 采用2D NMR技术对其NMR信号进行了全归属. DMSO-d₆代替CD₃OD作为溶剂，并利用重水交换，能准确读出偶合常数J_7,8值.      

An approach to numerical solution of multipoint boundary-value problems

An approach is proposed to solving multipoint boundary-value problems for linear differential equation of w-th order, based on reduction to two-point boundary-value problems. The two-point problems are solved by the stable discrete orthogonalization method. Some numerical examples are considered.Translated from Vychislitel'naya i Prikladnaya Matematika, No. 58, pp. 36–45, 1986.     

Stochastic Stability of Processes Determined by Poisson Differential Equations with Delay

We prove an existence theorem and establish the property of stochastic stability for processes determined by the Poisson stochastic differential equations with delay.     

B值鞅型序列的一些极限定理

本文讨论了一些B值鞅型序列的强大数定律 ,弱大数定律 ,Lr收敛性及完全收敛性 ,推广了许多熟知的结果 .     

Axisymmetric excitation of a dielectric torus: Numerical solution

The article considers the mathematical model of a lens antenna in the shape of a homogeneous dielectric torus excited by an axial magnetic dipole. The boundary-value problem for an elliptical differential equation is posed and reduced by the fundamental solution method to an integral equation of 2nd kind over the torus section. A numerical algorithm is proposed, and the numerical results are compared with experimental findings. Translated from Obratnye Zadachi Estestvoznaniya, Published by Moscow University, Moscow, 1997, pp. 109–115.