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排序方式: 共有229条查询结果,搜索用时 31 毫秒
31.
Monitoring of depth distribution of trace elements by GDMS 总被引:1,自引:0,他引:1
L. Aldave de las Heras O. L. Actis-Dato M. Betti E. H. Toscano U. Tocci R. Fuoco S. Giannarelli 《Microchemical Journal》2000,67(1-3)
The depth distribution of B and Li have been studied in ZrO2 layers by GDMS. Zr alloy has been corroded to ZrO2 in an autoclave in solutions containing Li and B. Samples were collected at different reaction times and analyzed. The GDMS crater depth and the sputter rate could be determined by profilometry for the discharge conditions used. In the analyzed samples three zones could be identified: oxide, interface and zircaloy. The concentration of Li and B was followed in each of the three zones. 相似文献
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Mario Betti 《Fresenius' Journal of Analytical Chemistry》1913,52(12):778-779
Ohne Zusammenfassung 相似文献
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We review three examples of quasi-exactly solvable Hamiltonians which possess multiple algebraisations. This includes the most prominent example, the Lamé equation, as well as recently studied many-body Hamiltonians with Weierstrass interaction potential and, finally, a 2×2 coupled channel Hamiltonian. 相似文献
36.
Formulation of Aluminum Chloride Phthalocyanine in Pluronic™ P‐123 and F‐127 Block Copolymer Micelles: Photophysical properties and Photodynamic Inactivation of Microorganisms
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Bruno Henrique Vilsinski Adriana Passarella Gerola Junior Adalberto Enumo Katieli da Silva Souza Campanholi Paulo Cesar de Souza Pereira Gustavo Braga Noboru Hioka Elza Kimura André Luiz Tessaro Wilker Caetano 《Photochemistry and photobiology》2015,91(3):518-525
Aluminum Chloride Phthalocyanine (AlPcCl) can be used as a photosensitizer (PS) for Photodynamic Inactivation of Microorganisms (PDI). The AlPcCl showed favorable characteristics for PDI due to high quantum yield of singlet oxygen (ΦΔ) and photostability. Physicochemical properties and photodynamic inactivation of AlPcCl incorporated in polymeric micelles of tri‐block copolymer (P‐123 and F‐127) against microorganisms Staphylococcus aureus, Escherichia coli and Candida albicans were investigated in this work. Previously, it was observed that the AlPcCl undergoes self‐aggregation in F‐127, while in P‐123 the PS is in a monomeric form suitable for PDI. Due to the self‐aggregation of AlPcCl in F‐127, this formulation did not show any effect on these microorganisms. On the other hand, AlPcCl formulated in P‐123 was effective against S. aureus and C. albicans and the death of microorganisms was dependent on the PS concentration and illumination time. Additionally, it was found that the values of PS concentration and illumination time to eradicate 90% of the initial population of microorganisms (IC90 and D90, respectively) were small for the AlPcCl in P‐123, showing the effectiveness of this formulation for PDI. 相似文献
37.
Existence and Regularity of Periodic Solutions to Certain First-Order Partial Differential Equations
Adalberto?P.?BergamascoEmail author Paulo?L.?Dattori da Silva Rafael?B.?Gonzalez 《Journal of Fourier Analysis and Applications》2017,23(1):65-90
We present conditions on the coefficients of a class of vector fields on the torus which yield a characterization of global solvability as well as global hypoellipticity, in other words, the existence and regularity of periodic solutions. Diophantine conditions and connectedness of certain sublevel sets appear in a natural way in our results. 相似文献
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M. K. Pham M. Betti P. P. Povinec M. Benmansour V. B��nger J. Drefvelin C. Engeler J. M. Flemal C. Gasc�� J. Guillevic R. Gurriaran M. Groening J. D. Happel J. Herrmann S. Klemola M. Kloster G. Kanisch K. Leonard S. Long S. Nielsen J.-S. Oh P. U. Rieth I. ?stergren H. Pettersson N. Pinhao L. Pujol K. Sato J. Schikowski Z. Varga V. P. Vartti J. Zheng 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(2):603-611
A new certified reference material (CRM) for radionuclides in sea water from the Irish sea (IAEA-443) is described and the results of the certification process are presented. Ten radionuclides (3H, 40K, 90Sr, 137Cs, 234U, 235U, 238U, 238Pu, 239+240Pu and 241Am) have been certified, and information values on massic activities with 95% confidence intervals are given for four radionuclides (230Th, 232Th, 239Pu and 240Pu). Results for less frequently reported radionuclides (99Tc, 228Th, 237Np and 241Pu) are also reported. The CRM can be used for quality assurance/quality control of the analysis of radionuclides in water samples, for the development and validation of analytical methods and for training purposes. The material is available in 5 L units from IAEA (http://nucleus.iaea.org/rpst/index.htm). 相似文献
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Pitois A de las Heras LA Zampolli A Menichetti L Carlos R Lazzerini G Cionini L Salvatori PA Betti M 《Analytical and bioanalytical chemistry》2006,384(3):751-760
Boron neutron capture therapy (BNCT) is a bimodal radiotherapeutic treatment based on the irradiation of neoplastic tissues
with neutrons after the tissues have selectively accumulated molecules loaded with nuclides with large neutron capture cross-sections
(such boron-10). Boron-10 carriers have been tested to a limited extent, and clinical trials have been conducted on sulfhydryl
borane (10B-BSH) and boronophenylalanine (10B-BPA). However, precise and accurate measurements of boron-10 concentrations (0.1–100 μg/g) in specimens and samples of limited
size (μg scale) are needed in order to be able to biologically characterise new compounds in predictive tissue dosimetry,
toxicology and pharmacology studies as well as in clinical investigations. A new approach based on fast separation and detection
of 10B-BPA performed by coupling capillary electrophoresis to electrospray mass spectrometry is reported. This method allows the
quantitative analysis and characterisation of 10B-BPA in a short time with a high separation efficiency. Detection limits of 3 μM for 10B-BPA and 30 ng/mL for 10B were obtained with CE–ESI–MS. A quantification limit of 10 μM for 10B-BPA (100 ng/mL for 10B) was attained. The total boron-10 concentration was determined by high-resolution inductively coupled mass spectrometry
in order to validate the method. Boron-10 isotope measurements were carried out by HR–ICP–MS at medium resolution (R=4000)
due to the presence of an isobaric interference at mass 10. Good agreement was obtained between the values from CE–ESI–MS
and those from HR–ICP–MS. The method has been successfully used to determine the 10B-BPA in two lines of cultured cells. 相似文献