银莱汤中主要成分的UPLC多波长宽动态测定及质量评价研究

采用超高效液相色谱(UPLC)定量测定银莱汤中10种有效成分的含量并用于其质量评价.采用Wa-ters ACQUITY UPLC HSS T3色谱柱(2.1 mm × 100 mm,1.8 μm),以0.1％甲酸水溶液-0.1％甲酸乙腈为流动相梯度洗脱,3波长切换(0～10 min,320 nm;10～16 min,3...     

Rh XⅢ—Cd XVI离子4s24p3—4s4p4能级与跃迁的理论计算

用HFR（Hartree-Fock with relativistic corrections）方法对Rb V—Cd XVI离子4s²4p³和4s4p⁴组态能级结构做了全面系统的理论计算研究. 通过分析能级结构参数的HFR理论计算值与基于实验能级拟合得到的计算值之比值随着原子序数Z_c变化的规律,运用广义拟合外推方法预言了这些离子能级结构参数. 由此进一步计算了Rh XⅢ,Pd XIV,Ag XV和Cd XVI离子4s²4p³（⁴S_3/2,²P_1/2,3/2,²D_3/2,5/2）和4s4p⁴（⁴P_1/2,3/2,5/2,²P_1/2,3/2,²D_3/2,5/2,²S_1/2）组态能级以及电偶极跃迁波长与振子强度. 研究表明,对于4s²4p³组态,单组态近似可以得到较满意的结果;而对于4s4p⁴组态,只有在考虑了4s²4p²4d的组态相互作用效应时,计算结果的准确性才能明显得到提高. 同时,本文还运用全相对论grasp2K-DEV程序包计算了Rh XⅢ—Cd XVI离子组态能级. 对于Rh XⅢ离子4s²4p³（²P_1/2）,Pd XIV离子4s²4p³（⁴S_3/2,²P_1/2,3/2,²D_3/2,5/2）和4s4p⁴（²P_1/2,3/2,²D_3/2,5/2,²S_1/2）,能级均无实验值;对于Ag XV和Cd XVI离子,截至目前还没实验能级数据,没有实验能级值的所有数据均仅来自本文的计算数值. 本文计算结果与已有实验值吻合得很好.     

高光谱最优波长选择及Fisher判别分析法判别玉米颗粒表面黄曲霉毒素

黄曲霉毒素是广泛存在于玉米中且具有剧毒的一种代谢产物,以美国农业部农业研究署(USDA-ARS) Toxicology and Mycotoxin Research Unit提供的2010年先锋玉米为研究对象,验证了高光谱成像技术对玉米中黄曲霉毒素检测的可行性。以甲醇为溶剂制备四种不同浓度的黄曲霉毒素溶液,并将其逐一滴在等量的4组共120粒玉米颗粒表面,以未处理的30粒洁净玉米作为一组对照样本,将大小、形状相似的150个样品随机分为训练集103个,验证集47个;对获取的400～1 000 nm波段范围内的高光谱图像,先进行标准正态变量变换(standard normal variate transformation, SNV)预处理,然后引入基于Fisher判别最小误判率的方法选择最优波长,并以所选波长作为Fisher判别分析法的输入建立判别模型,对玉米颗粒表面不同浓度的黄曲霉毒素进行识别,最后对模型判别正确率进行了验证。结果表明,选取四个最优波长(812.42, 873.00, 900.36和965.00 nm)时Fisher判别分析模型对训练集与验证集的准确率分别为87.4%和80.9%。该方法为含黄曲霉毒素玉米颗粒便携式检测仪器的开发,以及对田间霉变玉米自然代谢产生毒素的检测奠定了技术基础。     

A wave approach to hollow cylindrical electron cyclotron masers

A wave method has been applied to analyze and derive the dispersion equation for hollow cylindrical ECM's, which features in simpler mathematics and clearer physical interpretation. Besides, the effects of space charge Columb field have been taken into account. For the time being, the result is more likely suitable for fundamental mode interaction.     

New assignments in the submillimeter emission spectrum of the stratosphere

New line assignments in the spectrum of the stratospheric submillimeter emission, measured with unapodized resolution of 0.0033 cm^–1, have been made. Positive evidence for the presence of symmetric and asymmetric ozone isotopes, water vapour excited to the (010) level, and HCN is given.     

光泵亚毫米波激光器双光场双稳特性分析

本文用三能级均匀加宽的双光场激光半经典方程,研究了光泵亚毫米波激光器的泵浦场和发射场的光学双稳特性.双稳行为受选择介质的弛豫速率参数的变化影响较大.泵浦光的吸收系数,发射光的增益系数和腔损耗系数的大小也直接影响到双稳能否出现.     

标定光学劈尖厚度的波长数目研究

菲佐(Fizeau)激光波长计中光学劈尖厚度的标定是准确测量激光波长的先决条件。本文详细研究了进行光学劈尖厚度标定所需要的标定波长数目,分析结果表明:标定波长数目主要与标定波长的选择方式及光学劈尖厚度的误差范围有关。     

Optimal wavelengths obtained from laws analogous to the Wien’s law for monospectral and bispectral methods,and general methodology for multispectral temperature measurements taking into account global transfer function including non-uniform emissivity of surfaces

In this paper, it is shown how to select the optimal wavelengths minimizing the relative error and the standard deviation of the temperature. Furthermore, it is shown that the optimal wavelengths in mono-spectral and bi-spectral methods (for a Planck’s law) can be determined by laws analogous to the displacement Wien’s law. The simplicity of these laws can thus allow real-time selection of optimal wavelengths for a control/optimization of industrial processes, for example. A more general methodology to obtain the optimal wavelengths selection in a multi-spectral method (taking into account the spectral variations of the global transfer function including the emissivity variations) for temperature measurement of surfaces exhibiting non-uniform emissivity, is also presented. This latter can then find an interest in glass furnaces temperature measurement with spatiotemporal non-uniformities of emissivity, the control of biomass pyrolysis, the surface temperature measurement of buildings or heating devices, for example. The goal consists of minimizing the standard deviation of the estimated temperature (optimal design experiment). For the multi-spectral method, two cases will be treated: optimal global and optimal constrained wavelengths selection (to the spectral range of the detector, for example). The estimated temperature results obtained by different models and for different number of parameters and wavelengths are compared. These different points are treated from theoretical, numerical and experimental points of view.     

Measurement of complex permittivity and permeability of materials by quasi-optical method

A quasi-optical method for measuring the complex permittivity and permeability of materials at millimeter and submillimeter wavelengths is proposed. In principle, this method is applicable not only to solid samples but also to liquid and composite samples. The theory and experiment are described in this paper.     

Discontinuous behavior of effective transport coefficients in quasiperiodic media

We investigate the effective conductivity ^* of a quasiperiodic medium in ^d and the discontinuous dependence, found in ref. 1, of ^* on the wavelengths of the system. It was shown there, for example, that the effective conductivity ^*(k) for a layered medium with a one-dimensional local conductivity _k (x)=A+cosx+coskx, A>2, is discontinuous ink. An explicit class of higherdimensional examples which exhibit the discontinuity is constructed here. The conductivity ^*(k, L) of a sample of lengthL in one dimension asL is also analyzed and shown to have a plateau structure for any irrationalk well approximated by rationals.