Investigation on Performance of High Repetition Diode-Pumped Heat-Capacity Nd：YAG Laser

We demonstrate the improvements of both beam quality and thermal depolarization loss of an all-solid-state heat-capacity Nd:YAG laser with repetition rate of 50Hz, for the first time to our best knowledge, compared with the conventional steady-state laser. The beam quality of the heat-capacity laser has been improved three times higher than the conventional steady-state laser within the lasing periods of 60s. The depolarization loss caused by thermo-optical effects which is definitely considerable in steady-state Nd:YAG laser has almost not been observed under heat-capacity operation. Design and operations of the all-solid-state heat-capacity Nd: YAG laser with average output power of 25 W with repetition 50 Hz are also studied with the optical-to-optical efficiency of 33.3%.     

Commissioning of electron cooling in CSRm

A new generation electron cooler has started operation in the heavy ion synchrotron CSRm which is used to increase the intensity of heavy ions. Transverse cooling of the ion beam after horizontal multi-turn injection allows beam accumulation at the injection energy. After optimization of the accumulation process an intensity increase in a synchrotron pulse by more than one order of magnitude has been achieved. In given accumulation time interval of 10 seconds, 10⁸ particles have been accumulated and accelerated to the final energy. The momentum spread after accumulation and acceleration in the 10^－4 range has been demonstrated in six species of ion beams. Primary measurements of accumulation process varying with electron energy, electron beam current, electron beam profile, expansion factor and injection interval have been performed. The lifetimes of ion beams in the presence of electron beams were roughly measured with the help of DCCT signal.     

GC-MS方法分析杨梅果实精油中香气成分

采用气相色谱一质谱联用技术分析鉴定了木叶、东魁及黑炭3种新鲜杨梅果实精油样品的化学成分,并对三者成分进行对比分析.木叶梅果实精油中鉴定出55个化合物,以单萜类成分为主;东魁梅果精油中鉴定出49个化合物,以倍半萜烯和烷烃类成分为主;黑炭梅果精油中鉴定出化合物48种,以倍半萜烯和烷烃类成分为主.木叶杨梅中富含单萜而缺少倍半萜烯,这可能是其香气浓且易腐烂原因.     

一种含碳纳米管的第二代纳米流体的制备

采用胺官能团对多壁碳纳米管进行功能化处理.首先对碳纳米管进行氧化处理,然后通过中和反应和氢键作用等与二聚乙二醇十八胺进行反应,制得碳纳米管衍生物,其中碳纳米管的含量达40%,计算表明大约每50个碳原子上含有1个有机分子二聚乙二醇十八胺.其在室温下为黏性液体,并且可以溶于不同的溶剂.     

樟树叶挥发油β-环糊精包合物的制备研究

为解决樟树挥发油易挥发、不稳定的问题,用水蒸气蒸馏法提取鲜樟树叶挥发油,饱和水溶液法制备挥发油β-环糊精包合物,水蒸气蒸馏法再提取包合物挥发油,紫外光谱法分析包合前后挥发油。硅胶G-CMC薄层色谱法对照包合前后挥发油色谱图。包合前后挥发油紫外吸收光谱与薄层色谱图基本一致。β-环糊精能稳定包合樟树挥发油,解络后不会引起主要成分的改变。     

ZnO的激光分子束外延法制备及X射线研究

利用激光分子束外延(L-MBE)技术在α-Al2O3(0001)衬底上生长出了沿C轴高度择优取向的ZnO外延薄膜,并采用Philips四晶高分辨X射线衍射仪(Philip′s X′Pert HR-MRD)对ZnO薄膜的表面及结构特性进行了研究.应用小角度X射线分析方法(GIXA)对ZnO薄膜的表面以及ZnO/Al2O3界面状况进行了定量表征.X射线反射率(XRR)曲线出现了清晰的源于良好表面及界面特性的Kiessig干涉振荡峰,通过对其精确拟合求得ZnO薄膜的表面及界面粗糙度分别为0.34 nm和1.12 nm.ZnO薄膜与α-Al2O3(0001)衬底的XRD在面(in-plane) Φ扫描结果表明形成了单一的平行畴(Aligned in-plane Oriented Domains),其在面外延关系为ZnO［1010］ ||Al2O3［1120］.XRD ω-2θ 扫描以及ω 摇摆曲线半峰宽分别为0.12度和1.27度,这一结果表明通过形成平行畴及晶格驰豫过程,ZnO薄膜中的应力得到了有效的释放,但同时也引入了螺位错.     

圆偏振热活化延迟荧光材料及其器件的研究进展

圆偏振热活化延迟荧光材料具有分子结构易修饰、激子利用率高及圆偏振发光等特点,在光学信息存储、3D显示、发光器件和数据加密等领域具有广阔应用前景.利用此类材料作为发光层制备的圆偏振有机发光二极管,能够同时实现高发光不对称因子和理论上达100%的激子利用率,对发展低功耗和高性能有机发光二极管至关重要.近年来,通过不断的分子结构设计与优化,该类材料在有机发光二极管中的电致发光效率不断提高,但是仍然存在不对称因子低及效率滚降严重等问题.基于此,整理了目前已报道的圆偏振热活化延迟荧光化合物,重点讨论了其分子结构设计与光物理性质、圆偏振特性以及电致发光性能的关系规律,并对高性能圆偏振热活化延迟荧光材料的制备及其在有机发光二极管中的应用进行了展望.