共查询到20条相似文献,搜索用时 15 毫秒
1.
L. M. Bolot’ko A. N. Krasovskii A. M. Lyudchik V. I. Pokatashkin 《Journal of Applied Spectroscopy》2005,72(6):911-916
The conditions allowing one to measure the concentration of terrestrial ozone by the open-path DOAS method using a zero line
are considered. A technique based on measuring signals at two wavelengths, at least one of which belongs to the ozone absorption
UV band, is described. The error of measurements has been estimated. A block-diagram of the optical “open-path” meter for
measuring the terrestrial ozone concentration, TrIO-2, is presented.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 832–836, November–December, 2005. 相似文献
2.
I. V. Nikolaev V. N. Ochkin F. Yu. Khadzhiiskii S. N. Tskhai V. F. Chirkin 《Bulletin of the Lebedev Physics Institute》2013,40(2):50-53
The concentration of ozone produced in the atmosphere under mercury lamp light is measured using an UV light-emitting diode by the absorption spectrum in the range of 260–270 nm. The absorbance and ozone concentration measurement sensitivity is k = 8 · 10?7 cm?1 and ~3 ppbv, respectively. 相似文献
3.
T. Gumpenberger J. Heitz D. Bäuerle T.C. Rosenmayer 《Applied Physics A: Materials Science & Processing》2005,80(1):27-33
The surface properties of expanded polytetrafluoroethylene (ePTFE) can be modified by 172 nm excimer lamp irradiation in ammonia (NH3) or acetylene (C2H2) atmosphere. This surface modification is either related to the substitution of fluorine by nitrogen- and/or hydrogen-containing groups or to the deposition of material from the gas phase. Additional oxygen-containing functionalities are incorporated by reactions with the residual gas and/or oxidation in air after treatment. The changes in surface properties are discussed on the basis of water contact-angle measurements, X-ray photoelectron spectroscopy (XPS) and IR spectroscopy on dense PTFE samples. Surface modification yields a reduction of the tear strength and break-down elongation in tensile tests. Field-emission scanning electron microscopy (FE-SEM) revealed that the tensile failure occurred at the contact of fibrils and nodes in the material. With 193 nm ArF excimer-laser irradiation in NH3 atmosphere, both the modification efficiency and material degradation are considerably lower. PACS 68.47.Mn; 82.50.Hp; 82.30.Rs; 87.15.La 相似文献
4.
In this paper, the exp-function method is generalized to sine-Gordon (sG) equation and single-, double- and three-wave solutions are obtained. It is shown that the generalized exp-function method combined with appropriate anstaz may provide a straightforward, effective and alternative method for constructing multiwave solutions of some nonlinear partial differential equations. 相似文献
5.
V. D. Zvorykin A. O. Levchenko A. G. Molchanov I. V. Smetanin N. N. Ustinovskii 《Bulletin of the Lebedev Physics Institute》2010,37(2):60-64
The grazing mode of microwave propagation in a hollow plasma waveguide formed by ionization of atmospheric air with a small
easily ionized additive by strong UV pulses of the Garpun KrF laser (λ = 248 nm, the pulse duration and energy are ∼70 ns and ∼50 J) was experimentally demonstrated for the first time. The annular
laser beam produced a hollow tube ∼10 cm in diameter with an electron density of ∼1012 cm−3 in a plasma wall ∼1 cm thick, over whichmicrowave radiation with λ
mw
∼ 8 mm was transmitted to a distance of 60 m. Themicrowave signal transmitted by the waveguide was amplified by a factor
of 6 in comparison with propagation in free space. 相似文献
6.
7.
甲霜灵手性异构体比例的紫外光谱法快速测定 总被引:2,自引:0,他引:2
用β-环糊精作为手性选择试剂,利用甲霜灵中R和S异构体与β-环糊精相互作用强弱不同而导致的紫外-可见光谱的差异来检测甲霜灵手性异构体的比例,偏最小二乘法建立甲霜灵手性异构体比例的定量模型,并对模型效果进行评价。甲霜灵-环糊精体系中甲霜灵R-异构体比例的定量模型校正集的决定系数R2为0.999 0,校正集标准偏差SEC为0.006 7,相对标准偏差RSD为0.89%;外部检验集6个样品的预测值与化学值的相关系数为0.998 5,外部检验集标准差SEP为0.008 9,相对标准偏差RSD为1.17%,本方法简单快速,具有重要的实际应用价值。 相似文献
8.
9.
10.
The ignition kinetics of hydrogen-air mixtures with a small amount (0.5%) of ozone that are exposed to laser radiation with wavelength λ I = 248.4 nm is analyzed. The formation of excited O(1 D) atoms and O2(a 1Δ g ) molecules due to O3 molecule photodissociation is shown to greatly intensify the chain reactions and noticeably decrease the induction period and ignition temperature compared with the case when the radiation is absent even if the radiation energy applied to the gas is low, E s = 0.5?1.0 eV per O3 molecule. The efficiency of such a way of combustion initiation is much higher than at local heating of the medium by laser radiation but, at the same time, is considerably lower than the efficiency of the method based on excitation of O3 molecule asymmetric oscillations. 相似文献
11.
12.
13.
在对流层(小于12km),由于大气中气溶胶的存在,传统的利用大气中瑞利散射光谱测量大气温度的方法具有一定的局限性。借助傅里叶分析方法对不同高度的大气后向散射光谱通过碘吸收池所产生的不同透过率曲线进行处理,同时考虑了对流层中气溶胶的影响,可得到对流层中不同高度、不同大气后向散射比条件下的温度轮廓线。 相似文献
14.
15.
For the ground state of the ozone molecule, by using the multiconfigurational self-consistent field method, we calculated
the electric and magnetic properties — quadrupole moment, polarizability, tensor of magnetic susceptibility, nuclear quadrupole
interaction constant, and the rotational g-factor. Qualitative agreement between the calculated parameters and experimental
values was obtained. The tensors of chemical shielding in the spectrum of the nuclear magnetic resonance for the 17O isotopes have also been predicted (without allowance for the contribution made by the spin of the electrons).
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 713–716, November–December, 2005. 相似文献
16.
通过引入信息容量的概念,并借助Bayesian估计理论,给出了星载探测资料中所包含的如温度,湿度,O3,SO2,CH4等大气参数的信息容量的计算方案,该方法充分考虑了仪器各通道对反演参数的敏感性、各通道的观测误差特性以及背景场的误差特性;然后利用该方法对HIRS,AMSU,AIRS,IAIS四种仪器以及三种组合所包含的大气温度、湿度的信息容量进行了计算,得到十分有价值的结果,该方法预期在星载大气探测仪器的设计、各仪器的评估与比较、探测资料的
关键词:
大气探测资料
信息容量
权函数矩阵 相似文献
17.
The efficiency of the barrier-discharge UV lamp filled with a Xe/SF6 = 50: 1 mixture is studied as a function of the pressure in the mixture (ranging from 40 to 180 Torr) and electrode distance (3–11 mm). It is shown that, if the product pd is constant, the power of the discharge and the intensity of the UV radiation (354 nm) decrease with increasing pressure and shrinking the electrode gap. The maximal efficiency of the lamp (6–8%) is reached in the pressure range 30–50 Torr. 相似文献
18.
19.
Surface Oxygen Adsorption and Electric Property of Hydrogen-Terminated Single Crystal Diamonds by UV/ozone Treatment 下载免费PDF全文
Surface terminations of diamond play an important role in determining the electric properties of diamond-based electronic devices.We report an ultraviolet/ozone(UV/ozone) treatment process on hydrogen-terminated single crystal diamond(H-diamond) to modulate the carrier behavior related to varying oxygen adsorption on surfaces.By UV/ozone treatments,the induced oxygen radicals are chemically adsorbed on the H-terminated diamond and replace the original adsorbed H,which is analyzed by x-ray photoe... 相似文献