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1.
Joseph Turnbull Ryan Szukalo Dmitrij Zagidulin Mark Biesinger David Shoesmith 《工业材料与腐蚀》2021,72(1-2):348-360
The strategy for the permanent disposal of high-level nuclear waste in Canada involves sealing it in a copper-coated steel container and burying it in a deep geologic repository. During the early emplacement period, the container could be exposed to warm humid air, which could result in the condensation of nitric acid, produced by the radiolysis of the humid air, on the copper surface. Previous studies have suggested that both nitrate and oxygen reduction will drive copper corrosion, with the nitrate reduction kinetics being dependent on the concentration of soluble copper(I) produced by the anodic dissolution of copper in the reaction with oxygen. This study focused on determining the kinetics of nitrate and oxygen reduction and elucidating the synergistic relationship between the two processes. This was investigated using corrosion potential and polarization measurements in conjunction with scanning electron microscopy and X-ray photoelectron spectroscopy. Oxygen reduction was shown to be the dominant cathodic reaction with the oxidation of copper(I) to copper(II) by nitrate, promoting the catalytic cycle involving the reaction of copper(II) with copper to reproduce copper(I). 相似文献
2.
Walter Navarrini Tommaso Brivio Dmitrij Capobianco Maria Vittoria Diamanti Mariapia Pedeferri Luca Magagnin Giuseppe Resnati 《Journal of Coatings Technology and Research》2011,8(2):153-160
In this study amorphous fluorinated coatings applied to anodized titanium surface have been investigated. A copolymer between
tetrafluoroethylene and perfluoro-4-trifluoromethoxy-1,3-dioxole (AD60) and two perfluoropolyether containing ammonium phosphate
(F10) or triethoxysilane (S10) functionalities have been tested. To estimate the color alteration of the anodized titanium
surfaces due to the application of the coatings, spectrophotometric analyses have been made. Water and n-dodecane contact angles as well as apparent surface energy have been evaluated. Ellipsometry and atomic force microscopy
data have been used to measure the thickness of the fluorinated coatings. A tailored mechanical preliminary test has also
been explored to evaluate the adhesion of the coatings on the anodized titanium surface. The resistance to surface soiling
with castor oil was also preliminarily investigated. The fluorinated coating tested on anodized titanium showed a low apparent
surface energy and high chromatic aspect conservation, this is particularly evident for the titanium anodized coated with
triethoxysilane functionalities fluoropolymers S10. 相似文献
3.
Estimates of geometric parameters of fabricated flaws in artificial samples are given. 相似文献
4.
Stephan W. Reinhold Thomas Scherl Benjamin Stölcker Tobias Bergler Ute Hoffmann Christian Weingart Miriam C. Banas Dmitrij Kollins Martin C. Kammerl Bernd Krüger Bernhard Kaess Bernhard K. Krämer Bernhard Banas 《Lipids》2013,48(2):167-175
Acute transplant rejection is the leading cause of graft loss in the first months after kidney transplantation. Lipoxygenase products mediate pro- and anti-inflammatory actions and thus we aimed to correlate the histological reports of renal transplant biopsies with urinary lipoxygenase products concentrations to evaluate their role as a diagnostic marker. This study included a total of 34 kidney transplant recipients: 17 with an acute transplant rejection and 17 controls. LTE4, LTB4, 12-HETE and 15-HETE concentrations were measured by enzyme immunoassay. Urinary lipoxygenase product concentrations were not significantly changed during an acute allograft rejection. Nevertheless, LTB4 concentrations correlated significantly with the body temperature (P ≤ 0.05) 3 months after transplantation, and 12- and 15-HETE concentrations correlated significantly with renal function (P ≤ 0.05) 2 weeks after transplantation. In conclusion, our data show a correlation for LTB4 with the body temperature 3 months after transplantation and urinary 12- and 15-HETE concentrations correlate positively with elevated serum creatinine concentrations but do not predict acute allograft rejection. 相似文献
5.
A smoothing functional designed for derivation of discontinuity flaw parameters from measurements of magnetic field has been optimized, and attributes used in classifying discontinuity flaws have been considered. 相似文献
6.
A. V. Bochkov A. V. Zagidulin É. P. Magda V. V. Mironenko G. S. Sofienko A. S. Podymako 《Technical Physics Letters》2006,32(10):843-844
The possibility of lasing in a YAP:Tm3+ crystal with 3F4 level of the Tm3+ ion directly pumped by narrowband radiation of a gas laser operating in the middle IR range has been studied. The efficiency of the pumped energy conversion into spontaneous emission on the 3F4-3H6 transition in the Tm3+ ion was within 65–75%. The efficiency of generation with respect to the absorbed pumping energy was ~4%. 相似文献
7.
Bizyulev A. N. Muzhitskii V. F. Zagidulin R. V. Efimov A. G. Sysoev A. M. 《Russian Journal of Nondestructive Testing》2004,40(5):350-355
The field of application, the features of operation, and the main performance characteristics of a -12 eddy-current flaw detector are considered. Methods of digital data processing for improving the recognition of flaw-produced signals against the background noise are presented. 相似文献
8.
The oxide film properties on Alloy-22 in the applied potential (E) range −600 mV to 600 mV (vs. saturated KCl, Ag/AgCl reference electrode) were characterized by Electrochemical Impedance Spectroscopy (EIS) in near neutral pH, 5 M NaCl solutions, at 30 °C. The impedance properties of the film were compared to the chromium content of the film determined by X-ray photoelectron spectroscopy (XPS). The oxide film properties on Alloy-22 may be divided into three applied potential (E) ranges: −600 mV ≤ E < −300 mV, −300 mV ≤ E ≤ 300 mV, and E > 300 mV. For the range −600 mV ≤ E < −300 mV the film resistance (Rfilm) increases with potential accompanied by an increase in Cr2O3 content; in the range −300 mV ≤ E ≤ 300 mV, Rfilm values and the Cr2O3 content of the oxide film achieve their maximum values; for E > 300 mV, a decrease in both Rfilm and Cr2O3 is observed accompanied by a significant increase in Cr(OH)3. Comparison of the impedance properties for Alloy-22 to those of Ni–Cr alloys indicate that the barrier layer oxide on Alloy-22 contains a lower number of less mobile defects, most likely Cr interstitials. Destruction of the barrier layer for E > 300 mV leads to the formation of a thicker, less protective bilayer, which is high in Mo content. 相似文献
9.
The article presents general results on non-axiomatizabilityfor superintuitionistic predicate logics. In particular, thelogics of all well-ordered, all dually well-ordered, and alldually well-founded Kripke frames (in the semantics with nestedand with constant domains) are -hard, and the logic of all Kripke frames of finite heightis not recursively axiomatizable (although it is known to be -arithmetical). A resulton Kripke-incompleteness is stated as well. 相似文献
10.
R. V. Zagidulin V. F. Muzhitskii D. A. Isaev 《Russian Journal of Nondestructive Testing》2006,42(10):648-652
Analytic equations are obtained for the calculation of the magnetic-field strength and the density of magnetic charges at the faces of a finite-sized continuity flaw that is present in a ferromagnetic half-space during normal magnetization. Dependences of the components of the magnetic-field strength on the flaw’s geometric parameters and the height of the field measurement are given. 相似文献