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1.
香港花岗岩风化分级化学指标体系与风化壳分带 总被引:5,自引:1,他引:5
火成岩的化学风化过程实质上就是碱、碱土金属组分水解淋失与脱硅富铁铝化的地球化学过程。不同风化程度的岩石处于整个化学风化过程的不同阶段,因而具有不同的化学成分和风化度指标。笔者在对香港九龙两个地方5个钻孔共计150件不同深度、不同风化程度的样品化学全分析结果与岩土风化程度宏观判别结果的相互对比、选择和确认的基础上,建立了香港地区花岗岩风化岩土风化程度工程分级的化学指标体系。这一研究成果的提出不仅有利于提高花岗岩风化岩土工程分类的科。学性、可靠性和实用性,而且可以为风化岩土工程特性与风化作用关系研究提供理论依据。 相似文献
2.
The X-ray photoelectron spectrum of S8 vapour obtained with Al Kα radiation in a spectrometer designed for high temperature work is reported. The S2s and 2p levels were found to lie at 10.1(1) eV and 10.5(1) eV lower binding energy than the corresponding levels in SF6 and 0.5 eV lower than the levels in H2S. A S2p/S2s intensity ratio per electron of 0.40(3) was determined, in very good agreement with theory. The photoelectron spectrum in the molecular optical region was obtained and is in good agreement with a previously published spectrum of sulphur powder. 相似文献
3.
A study of atomic iodine and molecular thallium iodide by X-ray photoelectron and auger electron spectroscopy 总被引:1,自引:0,他引:1
M. Salim Banna Allen R. Slaughter Robert D. Mathews 《Journal of Electron Spectroscopy and Related Phenomena》1986,40(4):317-328
The I3d5/2 binding energy has been measured in atomic iodine, thallium iodide and cesium iodide by high temperature gas-phase photoelectron spectrscopy using Al K (1486.6 eV) X-rays. The iodine M5N4,5N4,5 (1G4) Auger energies for TlI and CsI have also been measured and combined with binding energies to yield extra-atomic relaxation energies of 0.5 and O.3 eV, respectively, after corrections are applied to the Auger parameter. Charges were calculated using the simple potential model, which was also used to obtain an estimate of the atomic T14f
binding energy. Two other estimates of the atomic T14f7/2 binding energy have also been calculated, both based on Dirac-Fock ΔSCF binding energies. The results of the three methods suggest a value of 125.3 ± 0.2 eV for T14f7/2. 相似文献
4.
Development and validation of a high‐performance liquid chromatography–tandem mass spectrometric method for simultaneous determination of bupropion,quetiapine and escitalopram in human plasma
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Semin Park Chul‐Soo Park Sung Joong Lee Boseok Cha Young Ah Cho Yi Song Eun Ae Yu Gon‐Sup Kim Jong Sung Jin A. M. Abd El‐Aty H. A. El‐Banna Ahmet Hacımüftüoğlu Jae‐Han Shim Sung Chul Shin 《Biomedical chromatography : BMC》2015,29(4):612-618
In the present study, an effective high performance liquid chromatography–tandem mass spectrometric (HPLC/MS/MS) method was developed and validated to simultaneously determine bupropion (BUP), quetiapine (QUE) and escitalopram (ESC) in human plasma using carbidopa as the internal standard. Chromatographic separation was achieved on a Waters Sun Fire C18 column using reversed‐phase chromatography. The MS/MS experiment was performed in positive ion multiple reaction monitoring mode to produce product ions of m/z 240.3 → 184.2 for BUP, 384.2 → 253.1 for QUE, 325.3 → 109.3 for ESC and 227.2 → 181.2 for the internal standard. The method showed good linearity (R2 ≥ 0.997), precision (relative standard deviation ≤7.5%), satisfactory intra‐ and interday accuracy (88.4–113.0%) and acceptable extraction recovery (87.2–115.0%), matrix effect (84.5.5?108.7%) and stability (92.3?103.5%). The method was successfully applied to determine the concentrations of BUP, QUE and ESC in human plasma samples. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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6.
Sergiy Shklyar Georgiy Shevchenko Yuliya Mishura Vadym Doroshenko Oksana Banna 《Methodology and Computing in Applied Probability》2014,16(3):539-560
We study the problem of optimal approximation of a fractional Brownian motion by martingales. We prove that there exists a unique martingale closest to fractional Brownian motion in a specific sense. It shown that this martingale has a specific form. Numerical results concerning the approximation problem are given. 相似文献
7.
This work deals with the estimation of polymers properties. An inverse analysis based on finite element method is applied
to identify simultaneously the constants thermal conductivity and heat capacity per unit volume. The inverse method algorithm
constructed is validated from simulated transient temperature recording taken at several locations on the surface of the solid.
Transient temperature measures taped with infrared camera on polymers were used for identifying the thermal properties. The
results show an excellent agreement between manufacturer and identified values. 相似文献
8.
We report the first experimental evidence for direct particle acceleration by stimulated emission of radiation. In the framework of this proof-of-principle experiment, a 45 MeV electron macrobunch was modulated by a high-power CO2 laser and then injected into an excited CO2 gas mixture. The emerging microbunches experienced a 0.15% relative change in the kinetic energy, in a less than 40 cm long interaction region. According to our experimental results, a fraction of these electrons have gained more than 200 keV each, implying that such an electron has undergone an order of magnitude of 2 x 10(6) collisions of the second kind. 相似文献
9.
M.S. Banna R.J. Key C.S. Ewig 《Journal of Electron Spectroscopy and Related Phenomena》1982,26(3):259-266
Core binding energies are reported for the singly-charged alkali ions obtained by removing the outer s electron and for the singly-charged halide ions obtained by adding a P electron. The levels studied are Li 1s, Na 1s, K 2p, Rb 3p, Cs 3d, F 1s, Cl 2p, Br 3p and I 3d. The binding energies were obtained by combining DiracF?ock ΔSCF binding-energy shifts between the ions and the corresponding isoelectronic rare gases with experimental rare-gas binding energies, and also by combining the calculated atomīon shifts with experimental atomic binding energies where available. It is shown that the former approach corrects accurately for the correlation energy, which is not included in single-configuration calculations. 相似文献
10.
The 3d levels of gaseous Te2 have been studied by X-ray photoelectron spectroscopy. The binding energies are 580.14 ± 0.10 for the 3d level and 590.45 ≈ 0.10 eV for 3d. Comparison is made with the atomic binding energies of 581.33 (3d) and 591.64 eV (3d), computed using Desclaux's Dirac-Fock program, and with binding energies in ihe solid. The latter are ≈ 2.2 eV lower than those in Te2. 相似文献