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101.
102.
V Malathy Devi B Fridovich G.D Jones D.G.S Snyder 《Journal of Molecular Spectroscopy》1983,97(2):333-342
Line strengths and self- and nitrogen-broadened half-widths were measured for spectral lines in the ν3 and ν2 + ν4 bands of 12CH4 and 13CH4 from 2870–2883 cm?1 using a tunable diode laser spectrometer. From measurements made over a temperature range from 215 to 297 K, on samples of 12CH4 broadened with N2, we deduced that the average temperature coefficients n, defined as , of the Lorentz broadening coefficients for the ν3 and ν2 + ν4 bands of 12CH4 were 0.97 ± 0.03 and 0.89 ± 0.04, respectively. A smaller increase is observed in line half-width with increasing pressure for E-species lines, for both self- and nitrogen-broadening, than for other symmetry species lines over the range of pressures measured, 70 to 100 Torr. 相似文献
103.
V. Malathy Devi Palash P. Das A. Bano K. Narahari Rao J.-M. Flaud C. Camy-Peyret J.-P. Chevillard 《Journal of Molecular Spectroscopy》1981,88(2):251-258
A diode laser spectrometer (resolution 0.0013 cm?1) was used to record, in the 12-μm region, high-quality spectra of the ν2 band of NO2. Using these spectra, it was possible to obtain the N2-broadening coefficients and an average self-broadening coefficient from measurements made for seven lines of this band. In addition, 30 single spin-component line intensities were measured. From them, through a least-squares fit, the purely vibrational transition moment of the ν2 band, as well as two correcting rotational terms involved in the expansion of the transition moment operator, were obtained. These results led to the determination of the dipole moment derivative . It was also demonstrated that there is good consistency between the correcting terms deduced from the observed intensities and their theoretical estimates. Finally, a complete spectrum of the ν2 band of NO2 was computed, providing a total band intensity Sv(ν2) = 0.542 × 10?18cm?1/molecule cm?2 at 296 K. 相似文献
104.
V Malathy Devi B Fridovich G.D Jones D.G.S Snyder 《Journal of Molecular Spectroscopy》1984,105(1):61-69
Absolute line strengths have been measured at room temperature for spectral lines in the R branch of the ν3 band of 12C16O2, 12C16O18O, and 12C16O17O and the (ν2 + ν3) ? ν2 and (ν1 + ν3) ? ν1 bands of 12C16O2 in the region 2365–2393 cm?1 using a tunable diode laser spectrometer; from these measurements band strengths have been computed. Self- and nitrogen-broadened half-widths have been measured for some ν3 lines of 12C16O2 and 12C16O17O, and nitrogen-broadened half-widths measured for some (ν2 + ν3) ? ν2 band lines of 12C16O2. From measurements made over a temperature range from 217 to 299 K we have obtained temperature coefficients n, for the N2-broadened Lorentz half-width defined as , for the ν3 and (ν2 + ν3) ? ν2 bands of 12C16O2. They are 0.757 ± 0.008 and 0.789 ± 0.015, respectively. 相似文献
105.
This paper deals with the free axisymmetric vibrations of orthotropic circular plates with linear variation in thickness. The analysis is based on a set of two differential equations derived by an extension of Mindlin's shear theory for plates. On simplification and algebraic manipulation, one of the dependent variables is eliminated from the governing equations of motion, giving rise to a fourth order linear differential equation with variable coefficients. The resulting differential equation is solved numerically by the Chebyshev collocation technique. Frequencies and mode shapes for the first five modes of vibration are computed for different plates. 相似文献
106.
引黄入晋工程大梁水库坝基存在大面积厚层上更新统(Q3)黄土。通过大量试验数据统计,湿陷起始压力、湿陷系数峰值的研究,以及不同埋深黄土微观结构的扫描电子显微镜研究,证实黄土的湿陷主要受架空孔隙的控制,随着土层埋深的加大,黄土结构逐渐由架空结构向局部架空或架空镶嵌型结构转变,因而湿陷性也逐渐减弱,为坝基黄土工程处理措施提供了依据。 相似文献
107.
V. Malathy Devi M.A.H. Smith A. Predoi-Cross R.L. Sams J.P. Bouanich 《Journal of Molecular Spectroscopy》2005,231(1):66-84
Absolute intensities, self- and air-broadening coefficients, self- and air-induced shift coefficients and their temperature dependences have been determined for lines belonging to the P- and R-branches of the ν2 band of H12C14N centered near 712 cm−1. Infrared spectra of HCN in the 14-μm region were obtained at high resolution (0.002-0.008 cm−1) using two different Fourier transform spectrometers (FTS), the McMath-Pierce FTS at the National Solar Observatory on Kitt Peak and the Bruker IFS 120HR FTS at the Pacific Northwest National Laboratory. Spectra were recorded with 99.8% pure HCN as well as lean mixtures of HCN in air at various temperatures ranging between +26 and −60 °C. A multispectrum nonlinear least squares technique was used to fit selected intervals of 36 spectra simultaneously to obtain the line positions, intensities, broadening, and shift parameters. The measured line intensities were analyzed to determine the vibrational band intensity and the Herman-Wallis coefficients. The measured self-broadening coefficients vary between 0.2 and 1.2 cm−1 atm−1 at 296 K, and the air-broadening coefficients range from 0.08 to 0.14 cm−1 atm−1 at 296 K. The temperature dependence exponents of self-broadening range from 1.46 to −0.12 while the corresponding exponents for air broadening vary between 0.58 and 0.86. The present measurements are the first known determination of negative values for the temperature dependence exponents of HCN-broadening coefficients. We were able to support our self-broadening measurements with appropriate theoretical calculations. Our present measurements are compared, where possible, with previous measurements for this and other HCN bands, as well as the parameters that are included in the 2000 and 2004 editions of the high-resolution transmission (HITRAN) database. 相似文献
108.
[reaction: see text] A synthesis of 4,8-disubstituted 2-phenylquinoline amino acids is reported with the incorporation of one example into a peptide by solid-phase synthesis. The phenylquinoline-containing peptide binds an RNA target with nanomolar affinity (K(D) = 208 nM). The strategy can be used to prepare a variety of 2-substituted quinoline amino acids for alteration of affinity in intercalator peptides. Since quinolones represent an important class of antibacterials, these compounds may be useful in the discovery of new antibacterial agents. 相似文献
109.
110.