新型蒽衍生物蓝光材料的合成及光电性能研究

通过引入具有电子传输性能的噁二唑衍生物支链,采用Suzuki偶联反应,设计并合成了一种新型的蒽衍生物蓝光材料,同时研究了它的光学性能、热学性能、电化学性能以及成膜性。研究结果表明,该化合物在四氢呋喃溶液中发射蓝色荧光,最大发射波长为433 nm,其荧光量子效率为0.94,是9,10-二（β-萘基）蒽（ADN）的1.17倍。该化合物薄膜经过100 ℃高温烘烤3 h,依然保持连续、均一、平整的无定型结构,是制备长寿命、高效率OLED的很有潜力的材料。     

多个侧向链对横向量子线传输性质的调制

利用递推格林函数方法，研究了与多个量子点间无相互作用的量子链相耦合的横向量子线的电子输运特性，发现量子链上格点的个数N_U与侧向无限或有限量子链个数N对横向量子线输运性质的不同调制规律.由计算可知，利用格林函数可以方便的对传输构型及传输链中的格点数进行调解，从而得到各种人为量子器件的输运性质. 关键词： 递推格林函数 无限链 有限链 电子输运     

双离子(40Ar+, C2H+6)辐照合成金刚石纳米晶颗粒

用双离子(⁴⁰Ar⁺，C₂H⁺₆)辐照实验完成了从多壁碳纳米管向金刚石纳米晶颗粒的转变.对转变机理进行了初步探讨.这一探索有望能成为一种金刚石纳米晶合成的新途径.由此可知，多重荷能离子辐照用于其他材料纳米结构的制备也不是凭空设想. 关键词： 金刚石纳米晶 离子辐照 透射电子显微镜     

A Photonic Bandgap Filter Using Metallic Hilbert Curves

We theoretically suggest that a metallic plate with Hilbert curves can possesses multiple resonances in a linear scale, leading to multiple stop bands and pass bands for electromagnetic waves over a wide frequency range.The forward transmission from a line source nearby a small plate covered by four cells with Hilbert curves is checked by a probe at the far field, the results agree well with the multiple resonance frequencies calculated by the plane wave incidence under a periodic boundary condition, the return loss spectra show that radiations of a line antenna working at 4.5 GHz can be greatly enhanced, which results from the interaction of the antenna and the subwavelength metallic plate. This kind of metallic pattern is very practical in multi-frequency functioned wave devices with sub-wavelength sizes.     

Deposition of Hydrogen-Free Silicon Nitride Thin Films by Microwave ECR plasma Enhanced Magnetron Sputtering at Room Temperature

Hydrogen-free silicon nitride （SiNx） films were deposited at room temperature by microwave electron cyclotron resonance （MW-ECR） plasma enhanced unbalance magnetron sputtering system. Both Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy are used to study the bonding type and the change of bonding structures of the silicon nitride films. The results indicate that the chemical structure and composition of SiNx films deposited by this technique depend strongly on the N2 flow rates, the stoichiometric SiNx film, which has the highest hardness of 22.9 GPa, could be obtained at lower N2 flow rate of 4 sccm.     

野生植物菊状千里光营养成分的测定

对野生植物菊状千里光的营养成分进行测定 ,结果表明 ,菊状千里光中至少含有 17种氨基酸、多种营养成分、丰富的矿物元素、维生素及 β-胡萝卜素。为开发利用植物资源提供了科学依据。     

3,5-二乙酰基-1,4-二氢吡啶热致变色性质的研究

研究了3,5-二乙酰基-1,4-二氢吡啶的热致变色过程中吸收光谱的变化,考察了溶剂、酸碱性、加热时间和温度等因素对热致变色现象的影响,并简要讨论了可能的变色机理。     

Study and design of RF coupler for Chinese ADS HWR superconducting cavity

An RF power coupler is a key component of the superconducting accelerating system in Chinese ADS proton linac injector I, which is used to transmit 15 kW RF power from the power source to the superconducting HWR cavity. According to the requirement of working frequency, power level, transmission capability and cooling condition, the physics design of coupler has been finished, which includes RF structure optimization, thermal simulation, thermal stress analysis and so on. Based on this design, the prototype of HWR coupler has been fabricated, and it has successfully passed the high power test.     

Al_(18)B_4O_(33)∶Cr~(3+)荧光粉的制备及发光性质研究

采用高温固相法合成了Al18B4O33∶Cr3+荧光粉,使用X射线粉末衍射仪和FSEM对样品的结构和形貌进行了表征,采用荧光分光光度计及紫外分光光度计研究了样品的发光性质及光吸收性质。结果表明,在紫外光或530~630 nm可见光激发下,样品能够发射出660~720 nm的红光,两个发射峰分别位于683 nm和694 nm,其最佳激发波长为590 nm。当原料中Al和B的量比为3.5时,样品的发光最强。初步分析了H3BO3的加入对样品发光影响的机理。样品的最佳煅烧温度为1 150℃。随着Cr3+掺杂浓度的升高,样品发光增强,但发光效率降低。样品的漫反射光谱表明,样品对绿光、黄橙光及紫外光有较强的吸收,是一种潜在的优良农用转光剂材料。     

UFsh—O软X光胶片在质子荧光源上的绝对刻度

介绍在Ｋ—４００质子加速器上，以质子激发低Ｚ材料产生的内壳层荧光（波长０．５０～６．８ｕｍ）作为光源绝对刻度ＵＦｓｈ—Ｏ软Ｘ光胶片．给出了该种胶片的三维黑密度曲线并对结果作了讨论．