基于虚拟仪器的近红外整粒小麦成分的测量系统

结合虚拟仪器技术和近红外光谱分析技术搭建了一种快速无损检测整粒小麦成分含量的系统。详细介绍了 该系统的硬件和软件设计，并扫描了40个已知粗蛋白化学值的整粒小麦样品的光谱图，建立了光谱数据与整粒小麦 粗蛋白含量间的关系模型来检验此系统的性能。结果表明此系统可以用于现场对整粒小麦进行快速无损检测。     

用电荷检测离子阱质谱技术测量聚苯乙烯球粒子的质量

采用高速电荷检测离子阱质谱技术(CDIT-MS)测量了聚苯乙烯球的质荷比和所带电荷数,得到了聚苯乙烯球粒子的质量;通过对数百次测量结果的统计,给出了粒子的质量分布图,并用Gaussian线型对质量分布图进行了拟合,得到聚苯乙烯球的平均质量为1.93×10-13kg,与理论质量(~2.03×10-13kg)接近.结果表明,电荷检测离子阱质谱技术能有效测量微米离子的质量,且测量时间短、准确性高.     

利用椭圆偏振光谱法研究硅片上DNA分子杂交

将单晶硅片硅烷化后，用戊二醛做醛基修饰，将5′端氨基修饰寡核苷酸探针片段通过醛－氨共价键结合在硅片上，然后用椭圆偏振光谱法对探针和不同序列样品的杂交反应进行了研究。结果表明该方法能在不对样品进行荧光标记的情况下直接研究杂交反应的效率，从而得知样品的序列信息。     

Recent progress in terahertz science and technology

The relatively new technique of coherent electromagnetic radiation, in the region of 1012 Hz, has potential to detect the nature of low energy processes in physics, chemistry and biomedicine. In this review article, an overview of recent progress of terahertz (THz) science and technology is presented. The development of the THz generation and detection system, the THz radiation applications which include THz time-domain spectroscopy and T-ray imaging, and the future potential of THz wave research are discussed.     

Assessment of blood and oxygen delivery to flaps of rhesus using near infrared steady-state spectroscopy

Near infrared spectroscopy has been considered as a potentially ideal noninvasive technique for the postoperative monitoring of plastic surgery. In this study, 6 flaps were raised on rhesus monkeys' forearms. Blood and oxygen delivery to these flaps was monitored following vascular occlusions and inhalation of pure oxygen. Optical fibers were adopted in the probe of the oximeter so that the cutaneous detection could be performed in reflectance mode. Different and repeatable patterns of changes were measured following vascular occlusions on flaps. It is clear that the near infrared spectroscopy is capable of postoperatively monitoring vascular problems in flaps, especially the venous problem. Near infrared spectroscopy showed high sensitivity to detect the dynamic changes in flaps induced by inhalation of pure oxygen in this study. The experimental results indicated that it was potential to assess tissue viability utilizing the dynamic changes induced by some noninvasive stimulation (such as inhaling pure oxygen). It may be a new assessing method that is rapid, little influenced by other factors and less inconvenient to patients.     

聚吡咯甲烯类聚合反应的动力学研究

采用原位紫外分光光度法研究了吡咯与苯甲醛，对二甲氨苯甲醛，香草醛及对硝基苯甲醛反应生成聚吡咯甲烯类聚合物过程中的合成反应机理。研究表明，聚吡咯甲烯的合成反应为一零级反应，其反应速率与催化剂的酸度有关，而与吡咯和醛的浓度无关，苯环上吸电子基团的存在有利于聚合反应的进行，较大空间位阻基团的存在则使聚合反应的速率下降。     

近红外光谱分析技术在监测L-异亮氨酸发酵过程中的应用

以L-异亮氨酸发酵过程的发酵液为样品, 用偏最小二乘法考察2种光谱采集方式、 7种光谱预处理方法及不同光谱波段选择对建立5种氨基酸光谱预测模型精度的影响. 通过建立L-异亮氨酸发酵过程中主副产物最佳光谱预测模型, 确定最佳光谱信息采集方式、 光谱预处理方法、 光谱波长范围及模型因子数. 结果表明: 反射扫描优于透射扫描获取光谱所建最佳预测模型; 反射光谱采集L- 异亮氨酸、 L-丙氨酸、 L-谷氨酸、 L-亮氨酸和L-苏氨酸5种氨基酸最佳校正模型相关系数均大于0.96, 其交互验证均方差分别为1.760,0.462,0.430,0.259,0.199, 相对分析误差分别为7.8,6.8,6.3,5.0,6.4， 表明所提出的近红外光谱分析法快速检测氨基酸发酵液中各成分稳定可行.     

PbSnS3纳米棒的光学性质

本文用拉曼谱和光致发光谱研究了PbSnS3纳米棒的光学性质.PbSnS3纳米棒的拉曼谱可用两种声子模式解析.PbSnS3纳米棒在紫外线激发下发蓝光.     

啤酒酵母的红外光谱研究

对啤酒酵母的红外光谱进行了分析。其红外谱图主要由蛋白质的吸收带、碳水化合物的吸收带组成。结合ZnSO4 后 ,啤酒酵母的主要成分和结构保持完整 ,但蛋白质的特征峰的吸收强度下降。     

玻色子亲态比系数的公式(Ⅰ)——三玻色子亲态比系数的显示式

本文推导出三个全同玻色子的亲态比系数的显示式,这些公式在相互作用玻色子模型中用玻色子有效相互作用计算核谱时很有用.