蓝绿光敏感的非水溶性光致聚合物特性研究

报导了一种新型蓝绿光敏感的非水溶性光致聚合物材料,这种材料以聚醋酸乙烯酯为成膜物,9-乙烯基咔唑(NVC),甲基丙烯酸2-苯氧乙脂(POEA)和双季戊四醇五丙烯酸酯为单体,Dye3和Dye4为光敏剂,邻氯代六芳基双咪唑(O-CL-HABI)为共引发剂.本材料能同时对蓝光和绿光敏感,用蓝光和绿光分别或同时对该材料曝光,可得到清晰图像.测得的两种衍射效率分别不低于80%.     

激光主动干涉条纹间距识别光学目标口径

利用物理光学相关知识及Collins衍射积分公式和硬边光阑的复高斯函数分解法,推导得到目标处干涉图样条纹间距与光学目标反射光时间分布关系的解析表达式.从原理分析、仿真计算和实验研究等方面研究了干涉场的条纹间距、光学目标口径参数和反射光时间分布包络的峰峰数、峰峰间距和峰峰比之间定量关系.结果表明,当条纹间距的大小约为目标的口径尺寸时,反射光时间分布包络的峰峰数由单峰向多峰过渡,峰峰间距和峰峰比曲线会出现极大值,根据这一变化规律可以估测出光学目标的口径参数,其估测精度受条纹间距可调节范围的影响.     

基于双电平脉冲宽度调制的低功耗可见光通信技术

为降低可见光通信系统中的额外功耗,对可见光通信中发光二极管结电容充放电导致的额外功耗进行了理论分析,给出了通信速率、结电容和调制方式对额外功耗的影响.基于此,提出了新型的双电平脉冲宽度调制技术,从额外功耗、带宽需求和差错性能三方面对双电平脉冲宽度调制进行了理论分析,并与非归零开关键控调制、脉冲位置调制和数字脉冲间隔调制进行了对比。结果表明,双电平脉冲宽度调制和非归零开关键控调制误时隙率相同,但额外功耗仅为非归零开关键控调制的M/2,（M为调制阶数）;虽然相比于脉冲位置调制和数字脉冲间隔调制,双电平脉冲宽度调制需要更高的信噪比,但额外功耗仅为脉冲位置调制和数字脉冲间隔调制的1/2,带宽需求也小于脉冲位置调制和数字脉冲间隔调制,在功耗和带宽敏感的可见光通信系统中有较大优势。     

显示反射全息图单光束相干复制技术

描述用单光束激光复活制银盐白光显示反射全息图的技术,本技术的关键：１）母全息图的颜色必须恢复到满足其布拉格条件;２）复制所用的光波与记录母全息图时的参考的相同;（３）复制所用的激光采用平行偏振,以减少界面反射;９４）采用白糖溶液作为折射率匹配液,取得极佳效果。     

Organometallic derivatives of penicillins and cephalosporins a new class of semi-synthetic antibiotics

Novel semi-synthetic derivatives of penicillin and cephalosporin have been prepared in which the conventional phenyl or heteroaromatic group has been replaced by a ferrocene moiety, and in which the metal atom is in close proximity to the β-lactam ring of the antibiotic; several of the compounds exhibit high antibiotic activity and others are potent β-lactamase inhibitors.     

(Cyclopentadienyl)(1-methylallyl)(butadiene)titanium

(Cyclopentadienyl)(1-methylallyl)(butadiene)titanium, C₁₃H₁₈Ti, has been obtained from the reaction between (C₅H₅)TiCl₃ or (C₅H₅)TiCl₂ and 1-methylallylmagnesium bromide in ether. The brown compound is diamagnetic and thermally stable, but very sensitive to oxygen. The nature of the new compound has been elucidated from its reaction with bromine and by IR, ¹H and ¹³C NMR, and mass spectral analysis.     

The reductive metalation of 1,2-dihalobenzocyclobutenes by NaFe(CO)2Cp and HFe(CO)2Cp

The reactions between cis- and trans-1,2-dibromo- or 1,2-diidobenzocyclobutene and NaFe(CO)₂Cp (NaFp) were investigated. The mechanism of formation of 1,2-bis(cyclopentadienyldicarbonyliron)benzocyclobutene (I) and 1-(cyclopentadienyldicarbonyliron)benzocyclobutene (II) is thought to involve initial formation of benzocyclobutadiene, addition of a Fp radical to benzocyclobutadiene and subsequent addition of a second Fp radical to form I, or hydrogen abstraction from FpH to form II.