The absorption spectrum of N2＋ has been studied using optical-heterodyne velocity mod- ulation spectroscopy in the near-infrared region. The observed spectral lines were assigned to the （3,1）, （4,2）, （5,3）, （...The absorption spectrum of N2＋ has been studied using optical-heterodyne velocity mod- ulation spectroscopy in the near-infrared region. The observed spectral lines were assigned to the （3,1）, （4,2）, （5,3）, （8,5） bands of the A2Ⅱu-X2∑g＋ system and the line lists were pro- vided. The （5,3） band was studied for the first time. Fourteen rotational-resolved bands in literatures were fitted together with our observed bands and the molecular constants were obtained for VA=0-9 and vx=0-5.展开更多
The absorption spectrum of the C1Ⅱ state of N2O molecule in the wavelength range of 142.5-147.5 nm has been measured under the jet-cooled condition, and the clear spectral features are displayed. A vibrational progre...The absorption spectrum of the C1Ⅱ state of N2O molecule in the wavelength range of 142.5-147.5 nm has been measured under the jet-cooled condition, and the clear spectral features are displayed. A vibrational progression is observed with a frequency interval of about 500 cm-1. With the aid of potential energy surfaces （PES） of the low-lying electronic states of N2O, the vibrational progression is assigned as the bending mode of the repulsive C1Ⅱ state. From the Fourier transformation analysis, the recurrence period of the periodic orbit near the transition state region is derived to be 65 fs. Through the least-square Lorentzian fitting, the lifetimes of the resonance levels are estimated from their profile widths to be about 20 fs, which is shorter than the recurrence period. Therefore, a new explanation is suggested for the observed diffuse spectral structure, based on the behavior of dissociating N20 on PES of the C1Ⅱ state in the present excitation energy range.展开更多
Underwater imaging posts a challenge due to the degradation by the absorption and scattering occurred during light propagation as well as poor lighting conditions in water medium Although image filtering techniques ar...Underwater imaging posts a challenge due to the degradation by the absorption and scattering occurred during light propagation as well as poor lighting conditions in water medium Although image filtering techniques are utilized to improve image quality effectively, problems of the distortion of image details and the bias of color correction still exist in output images due to the complexity of image texture distribution. This paper proposes a new underwater image enhancement method based on image struc- tural decomposition. By introducing a curvature factor into the Mumford_Shah_G decomposition algorithm, image details and struc- ture components are better preserved without the gradient effect. Thus, histogram equalization and Retinex algorithms are applied in the decomposed structure component for global image enhancement and non-uniform brightness correction for gray level and the color images, then the optical absorption spectrum in water medium is incorporate to improve the color correction. Finally, the en- hauced structure and preserved detail component are re.composed to generate the output. Experiments with real underwater images verify the image improvement by the proposed method in image contrast, brightness and color fidelity.展开更多
AIM： To prepare a complex of hyaluronic acid （HA） and phospholipids （PL）, and study the improvement effect of PL on the oral absorption of HA. METHODS： The complex of HA-PL （named Haplex） was prepared by film ...AIM： To prepare a complex of hyaluronic acid （HA） and phospholipids （PL）, and study the improvement effect of PL on the oral absorption of HA. METHODS： The complex of HA-PL （named Haplex） was prepared by film dispersion and sonication method, its physico-chemical properties were identified by infrared spectra and differential scanning calorimetry （DSC）. The oral absorption of Haplex was studied. Thirty-two healthy rats were divided into 4 groups randomly： （1） a normal saline （NS） control group; （2） an HA group; （3） a mixture group and （4） a Haplex group. After intragastric administration, the concentration of HA in serum was determined. RESULTS： The physico-chemical properties of Haplex were different from HA or PL or their mixture. After Haplex was administered to rats orally, the serum concentration of HA was increased when compared with the mixture or HA control groups from 4 h to 10 h （P 〈 0.05）. The AAUCo-12, of Haplex was also greater than that of the other three groups （P 〈 0.05）. CONCLUSION： The method of film dispersion and sonication can prepare HA and PL complex, and PL can enhance the oral absorption of exogenous HA.展开更多
The adsorptive behavior of nanometer attapulgite modified by acid to Pb（Ⅱ） was investigated by flame atomic absorption spectrometry （FAAS） in this paper. The mainly effect parameters ott the adsorptive efficiency...The adsorptive behavior of nanometer attapulgite modified by acid to Pb（Ⅱ） was investigated by flame atomic absorption spectrometry （FAAS） in this paper. The mainly effect parameters ott the adsorptive efficiency of Pb（Ⅱ）, such as the acidity of the solution, the amount of attapulgite, oscillation time and static time were studied. Also the influencing factors of the recovery efficiency of Pb（Ⅱ）, including the concentration of hydrochloric acid, the volume of hydrochloric acid, oscillation time and static time were investigated. The adsorptive capacity of Pb（Ⅱ） on nanometer attapulgite was 26.5mg/g and the adsorptive capacity of first cycle and second cycle regenerated nanometer attapulgite were 26.5mg/g and 26.3mg/g, respectively. The results obtained indicated that the regenerated effect was good.展开更多
基金This project was supported by the National Natural Science Foundation of China （No.11004062）.
文摘The absorption spectrum of N2＋ has been studied using optical-heterodyne velocity mod- ulation spectroscopy in the near-infrared region. The observed spectral lines were assigned to the （3,1）, （4,2）, （5,3）, （8,5） bands of the A2Ⅱu-X2∑g＋ system and the line lists were pro- vided. The （5,3） band was studied for the first time. Fourteen rotational-resolved bands in literatures were fitted together with our observed bands and the molecular constants were obtained for VA=0-9 and vx=0-5.
基金This work was supported by the National Natural Science Foundation of China （No.10979042 and No.21073173）, the National Key Basic Research Special Foundation of China （No.2007CB815204）, and the Fundamental Research Funds for the Central Universities. Authors also would like to thank Prof. J. B. Nee to provide his experimental data for our reference.
文摘The absorption spectrum of the C1Ⅱ state of N2O molecule in the wavelength range of 142.5-147.5 nm has been measured under the jet-cooled condition, and the clear spectral features are displayed. A vibrational progression is observed with a frequency interval of about 500 cm-1. With the aid of potential energy surfaces （PES） of the low-lying electronic states of N2O, the vibrational progression is assigned as the bending mode of the repulsive C1Ⅱ state. From the Fourier transformation analysis, the recurrence period of the periodic orbit near the transition state region is derived to be 65 fs. Through the least-square Lorentzian fitting, the lifetimes of the resonance levels are estimated from their profile widths to be about 20 fs, which is shorter than the recurrence period. Therefore, a new explanation is suggested for the observed diffuse spectral structure, based on the behavior of dissociating N20 on PES of the C1Ⅱ state in the present excitation energy range.
基金supported by the National Natural Science Foundation of China (Grant Nos.60772058 and 61271406)
文摘Underwater imaging posts a challenge due to the degradation by the absorption and scattering occurred during light propagation as well as poor lighting conditions in water medium Although image filtering techniques are utilized to improve image quality effectively, problems of the distortion of image details and the bias of color correction still exist in output images due to the complexity of image texture distribution. This paper proposes a new underwater image enhancement method based on image struc- tural decomposition. By introducing a curvature factor into the Mumford_Shah_G decomposition algorithm, image details and struc- ture components are better preserved without the gradient effect. Thus, histogram equalization and Retinex algorithms are applied in the decomposed structure component for global image enhancement and non-uniform brightness correction for gray level and the color images, then the optical absorption spectrum in water medium is incorporate to improve the color correction. Finally, the en- hauced structure and preserved detail component are re.composed to generate the output. Experiments with real underwater images verify the image improvement by the proposed method in image contrast, brightness and color fidelity.
基金the Natural Science Foundation of Shandong Province, China. No. Y2005C31
文摘AIM： To prepare a complex of hyaluronic acid （HA） and phospholipids （PL）, and study the improvement effect of PL on the oral absorption of HA. METHODS： The complex of HA-PL （named Haplex） was prepared by film dispersion and sonication method, its physico-chemical properties were identified by infrared spectra and differential scanning calorimetry （DSC）. The oral absorption of Haplex was studied. Thirty-two healthy rats were divided into 4 groups randomly： （1） a normal saline （NS） control group; （2） an HA group; （3） a mixture group and （4） a Haplex group. After intragastric administration, the concentration of HA in serum was determined. RESULTS： The physico-chemical properties of Haplex were different from HA or PL or their mixture. After Haplex was administered to rats orally, the serum concentration of HA was increased when compared with the mixture or HA control groups from 4 h to 10 h （P 〈 0.05）. The AAUCo-12, of Haplex was also greater than that of the other three groups （P 〈 0.05）. CONCLUSION： The method of film dispersion and sonication can prepare HA and PL complex, and PL can enhance the oral absorption of exogenous HA.
文摘The adsorptive behavior of nanometer attapulgite modified by acid to Pb（Ⅱ） was investigated by flame atomic absorption spectrometry （FAAS） in this paper. The mainly effect parameters ott the adsorptive efficiency of Pb（Ⅱ）, such as the acidity of the solution, the amount of attapulgite, oscillation time and static time were studied. Also the influencing factors of the recovery efficiency of Pb（Ⅱ）, including the concentration of hydrochloric acid, the volume of hydrochloric acid, oscillation time and static time were investigated. The adsorptive capacity of Pb（Ⅱ） on nanometer attapulgite was 26.5mg/g and the adsorptive capacity of first cycle and second cycle regenerated nanometer attapulgite were 26.5mg/g and 26.3mg/g, respectively. The results obtained indicated that the regenerated effect was good.
