Cu1-xAgxI(x=0.5～0.6)纳米微粒的制备与表征

In the presence of PVPK30,Cu_1-xAg_xI nanoparticles were prepared by ion exchange reaction.The product was characterized by FT-IR,XRD,TEM,EDS and SPS,respectively.It was found that the value of x is ap-proximately 0.5～0.6and the average diameter of the nanoparticles is 10～20nm.The product shows surface photovoltage property of semiconductor and the existence of Cu⁺ greatly enhances the separation efficiency of photoinduced electron-hole pairs.Meanwhile,SPS of Cu_1-xAg_xI nanoparticles with different X (Ag/I)value had been investigated. The results show that when X is 0.5～0.576, the SPS intensity of Cu_1-xAg_xI nanoparticles is highest.     

First oxalate-bridged pentanuclear [Cu(L)]3[Mn(ox)3]2 complexes: synthesis and magnetism

Two novel CuII3MnIII2 pentanuclear oxalato complexes have been synthesized and characterized, namely [Cu(L)]3[Mn(ox)3]2 [L = 1,10-phenanthroline(phen) and 2,2-bipyridyl(bipy)] where ox is the oxalate dianion. Based on i.r., elemental analyses and electronic spectra, thesecomplexesareassignedtoextendedoxalato-bridged structures consisting of two manganese(III) ions and three copper(II) ions, in which each manganese(III) has a distorted octahedral environment and each copper(II) ion a distorted square pyramidal environment. The temperature dependance of the magnetic susceptibility for [Cu(phen)]3[Mn(ox)3]2·4H2O was measured over the 4.2–300K range and the observed data indicates antiferromagnetic spin exchange interaction between the CuII and MnIII ions.     

Oxalate-bridged mixed-valence trinuclear manganese(II)-manganese(III)-manganese(II) complexes: synthesis and magnetism

Summary Two novel Mn^II-Mn^III-Mn^II oxalato complexes have been synthesized and characterized, namely [Mn₂Mn(ox)₃(L)₄](ClO₄) [L = 1,10-phenanthroline (phen) or 5-nitro-1,10-phenanthroline (NO₂-phen), respectively], where ox stands for the oxalate dianion. Based on i.r., elemental analyses and electronic spectra, these complexes are proposed to have extended oxalatobridged structures consisting of Mn^II and Mn^III ions, in which Mn^III and each Mn^II ion has a distorted octahedral environment. The temperature dependence of magnetic susceptibility for [Mn₂Mn(ox)₃(phen)₄] (ClO₄) was measured over the 4.1–300 K range and the observed data were successfully simulated by an equation based on the spin-Hamiltonian operator ( = -2J( _{1 2} + _{2 3})), giving the exchange integral J = -1.57cm^–1. This indicates weak antiferromagnetic spin exchange interaction between Mn^II and Mn^III ions.     

7-氧杂降冰片烯的官能化及其开环易位聚合

设计合成了含氧化乙烯重复单元和咪唑盐侧基的降冰片烯类单体,用Grubbs催化剂(PCy3)2Ru(CHPh)Cl2(1)和(SIMes)(PCy3)Ru(CHPh)Cl2(2)对单体进行了开环易位聚合(ROMP).考察了单体在不同条件下(溶剂、温度等)的聚合反应,尤其是在离子液体中ROMP的聚合特征.结果表明,2的催化活性比1的高;2催化单体在有机溶剂中聚合所得聚合物的分子量不可控,而在离子液体[BMIm]PF6中能够顺利进行均相聚合反应,且对聚合物的分子量可控性较好.用核磁共振谱(NMR)对合成的单体及聚合物的结构进行了表征.用差示扫描量热法(DSC)测定聚合物的玻璃化转变温度为-17.34℃,采用循环伏安法测得聚合物的电化学稳定窗口为3.0V.     

IPDI的NMR数据解析

用NMR对异氟尔酮二异氰酸酯(IPDI)的两种立体异构体进行结构表征,包括1H、13C、DEPT135、HMBC、HMQC谱,并详细解析图谱.此外对这两种异构体在不同温度下的稳定性进行了研究.     

N-甲基吡咯烷酮与HnXMo12O40·mH2O(X=P,Si,Ge)电荷转移盐的合成、表征及非线性光学性质

由 N-甲基吡咯烷酮 (NMP)和 Hn XMo1 2 O40 · m H2 O(X=P,Si,Ge)合成了具有非线性光学性质的电荷转移盐 ,(NMPH ) 3PMo1 2 O40 · CH3CN ( ) ,(NMPH) 4Si Mo1 2 O40 · CH3CN ( )和(NMPH) 4Ge Mo1 2 O40 · CH3CN( ) ,并以元素分析 ,红外光谱 ,漫反射电子光谱进行了表征 .结果表明 ,杂多酸形成电荷转移盐后其阴离子结构未变 ;N-甲基吡咯烷酮通过 N原子与酸中的质子H 结合成阳离子而成盐 ,在高压汞灯照射下阴阳离子之间可以发生电荷转变 .非线性光学性质研究表明 ,电荷转移盐的倍频效应强度分别为 I2ω =0 .3IKDP,I2ω =0和 I2ω =0 .0 2 IKDP,三阶非线性系数分别为χ( 3) =5 .0× 10 - 1 4 esu,χ( 3) =3.1× 10 - 1 3esu和χ( 3) =4.3× 10 - 1 3es     

电器无失效数据的Bayes可靠性分析

通过利用分布函数的凸凹性合理的构造了无失效数据(ti,ni)在ti时刻失效的概率pi=p{Tti}的一类先验分布,利用贝叶斯定理给出了无失效数据概率的一种估计.并根据算例验证该估计是合理的.     

关于粗糙模糊集的相似度量

基于对不确定性信息处理的背景,定义了粗糙模糊值与粗糙模糊集的相似度量,研究了它们的有关性质.     

自动化车床最优刀具检测模型研究

针对自动化车床工序最优检测和刀具更换问题进行了探讨.将定期检测和将刀具更换作用于同一工序流程,在只考虑刀具故障条件下,通过概率论和更新过程理论建立了以单位时间内期望费用为目标函数的数学模型,以检测间隔和刀具更换间隔为策略,确定最优的策略使得目标函数达到最小,并求出了经长期运行单位时间内期望费用的明显表达式.最后还对结果进行了讨论.     

直接调制半导体激光器的脉冲驱动电路研究

研制了一种应用于直接调制半导体激光器的脉冲驱动电路.根据直接数字频率合成原理,利用现场可编程逻辑阵列产生频率可调方波去触发雪崩晶体管,以及雪崩晶体管的雪崩效应产生频率可调脉宽固定在3 ns的主体脉冲.该脉冲经过衰减器衰减得到合时的脉冲幅度.输出脉冲最高频率可到100 kHz,其输出电压幅度为9 V.