共查询到18条相似文献,搜索用时 125 毫秒
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新型共轭聚席夫碱蓝色发光材料的合成与性能 总被引:1,自引:0,他引:1
对硝基苯甲酸经酯化和肼解后制得对硝基苯甲酰肼,再与对硝基苯甲酰氯反应得到1,2-二(4-硝基苯甲酰基)肼,所得化合物通过环化和还原生成了2,5-二(4-氨基苯基)-1,3,4-噁二唑,然后在中性条件下与对苯二甲醛聚合得到一种主链含噁二唑单元和席夫碱单元的新型共聚体,利用元素分析、红外光谱、紫外光谱、热重分析和荧光光谱等对单体和聚合物进行检测.结果表明:1,3,4-噁二唑基团和席夫碱基团都是很好的生色团,对氧和热特别稳定;且两个基团相结合的聚合反应容易进行,所得聚合物的溶解性和热稳定性较好,并能发射较强的蓝色荧光,是一种具有发展前景的新型蓝色有机发光材料. 相似文献
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若干芳香族化合物气溶胶单粒子的在线测量 总被引:2,自引:0,他引:2
通过在自行研制的气溶胶飞行时间激光质谱仪上对苯酚、苯胺、1,3-二氯苯、硝基苯气溶胶单粒子的质谱特征进行了激光解吸附电离飞行时间质谱(laser desorption/ionization time-of-flight mass spectra,LDI-TOFMS)研究,分别得到了它们的质谱图,分析了它们特征谱的形成机理.发现这几种芳香族化合物气溶胶单粒子的LDI-TOFMS谱都是容易优先失去一个电子形成母体离子峰M ,其官能团也极易脱落,这为我们进行有机分子在气溶胶状态下的激光质谱特征研究以及单颗粒大气气溶胶化学组成的鉴别提供了基本信息. 相似文献
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利用Z扫描测量技术研究了飞秒和皮秒激光脉冲激发下液体硝基苯的三阶非线性折射率n2。Z扫描实验的结果表明:液体硝基苯在20 ps、532 nm波长激发下的非线性折射率n2是300 fs,800 nm波长激发下的n2值的11倍。利用带相位物体的飞秒泵浦探测方法研究了液体硝基苯的非线性折射动力学机理。基于泵浦探测实验结果确定了液体硝基苯在超快激光激发后的非线性折射响应函数。测量结果可为基于硝基苯液体的集成光子学器件设计和溶液非线性测量提供有益参考 相似文献
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二相编码—线性调频信号的检测 总被引:1,自引:0,他引:1
介绍了谱相关和倒谱的概念和原理;论述了二相编码—线性调频信号的结构、表达式及其频域特性;分析了二相编码—线性调频信号的谱相关分布,指出了它和码元速率的关系;最后提出用倒谱和谱相关结合检测信号,并估计谱相关分布中谱线的间隔。 相似文献
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研制了振动筛实验模型,并开发了振动筛梁断裂故障实验测试系统,利用双轴加速度传感器采集振动筛的加速度信号,并通过A/D转换将数据保存到工控机中。比较实验测试系统得出的模型筛特征频率与理论频率,相对误差小于4.2%,验证了硬件与软件系统的准确性;同时将模型筛与香蕉直线振动筛的时域谱、频域谱、功率谱的对比,其相对误差小于1.25%,验证了可以利用模型筛进行试验来得到振动筛的固有特性参数;在振动筛实验模型正常工作和梁断裂的情况下,将时域谱、频域谱、功率谱特性进行对比,得到了基于时域谱、频域谱、功率谱的故障诊断方法。 相似文献
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随着通信理论技术的发展,对于QAM信号的研究给予特别的关注。采用谱相关的方法,对QAM信号进行处理,研究了正交幅度调制信号(QAM)的循环平稳性。根据谱相关理论,推导出了QAM信号谱相关方法的表达式,得出QAM信号的循环谱特征并对其进行分析,并进行仿真模拟实验。通过仿真可以看出,谱相关理论对数字信号的分析,与一般的频谱相比可以提供更为丰富的谱信息,以及具有很强的噪声抑制能力。 相似文献
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Optimum vapor pressure for stoichiometry in growth of PbTe and PbSnTe has been calculated. The result is in a good agreement with the experimentally obtained ones for vapor pressure controlled Bridgman growth and liquid phase epitaxy. The procedure of calculation follows that performed earlier for GaAs, which assumed the equality of the chemical potentials of the volatile element in gas, liquid and solid phases. Also it is pointed out that the nonequilibrium reactions of interstitial Te atoms with Pb vacancies forming anti-site Te, as well as Te precipitations, take place at the highest applied Te vapor pressure region. 相似文献
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本文介绍了以YAG/DYE激光器为光源,双光栅单色仪,Boxcar积发平均器和x-y记录仪作为信息处理,放大和记录装置组成的脉冲喇曼光谱实验系统及使用该系统所作的液体、固体脉冲喇曼斯托克斯、反斯托克斯和相干反斯托克斯(CARS)光谱。并讨论了脉冲喇曼光谱与连续喇曼光谱的优缺点及系统所存在的一些问题。 相似文献
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Coherent anti-Stokes Raman scattering spectroscopy(CARS) is a well-known detecting tool in biosensing and nonlinear spectroscopy. It can provide a non-invasive alternative without the need for exogenous labels, while the enhancement factor for surface plasmon resonances(SPR) are extensively used to increase the local field close to the oscillators and which can obtain high enhancement. In this work, we investigate the enhancement factor of our structure for surface-enhanced coherent anti-Stokes Raman scattering. The absorption spectrum of the structure has been studied, a wide range of absorption has been realized. The enhancement can be as high as 1016 over standard CARS. Our design is very useful for improving the enhancement factor of surface-enhanced coherent anti-Stokes Raman scattering. 相似文献
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J. Mimila-Akroyo J. Diaz M. B. Derbali H. Maaref S. Alaya D. Stievenard J. C. Bourgoin 《Journal of Electronic Materials》1996,25(12):1851-1857
The growth of homoepitaxial GaP layers using Te-doped GaP as source material has been obtained by the so-called closed space
vapor transport technique. The photoluminescence study shows that these layers, when grown under optimized thermodynamical
conditions, have both a large luminescence efficiency and the same optical quality as the ones obtained by liquid phase epitaxy.
The variation of the luminescence properties with the conditions of growth has been investigated. Both electron paramagnetic
resonance and deep level transient spectroscopy detect the presence of deep levels that are not observed in liquid phase epitaxy
materials. 相似文献
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《Electron Devices, IEEE Transactions on》1975,22(9):716-721
A series of experiments have been done in which the properties of GaP grown by liquid phase epitaxy (LPE) have been varied by providing an additional source of phosphorus via the vapor phase. The quality of the crystals, as judged from gross defect features observed in etched cross sections, is a function of the amount of phosphorus added to the vapor phase. 相似文献
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