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51.
Dr. Ch. Fabjan 《Monatshefte für Chemie / Chemical Monthly》1977,108(1):29-40
The kinetics of the system O2/HO2 ?, OH? were studied at pyrolytic carbon in alkaline electrolytes. The rest potentials are close to the reversible values. They decrease by 30 mV when the HO2 ?-concentration is increased by a factor 10. CathodicTafel lines displayb-values between 70 and 95 mV. The exchange current densities are evaluated by extrapolation ofTafel lines to zero overvoltage and from the charge transfer resistance. Two different succeeding charge transfer reactions occur in course of the overall process, the first of which is the rate-determining step. A cathodic reaction order of zero is obtained with respect to HO2 ?. Theb values of anodicTafel lines are between 60 and 80 mV, the corresponding reaction order concerning the HO2 ? concentration is found to be +0.5. The kinetic studies prove the reversibility of the system O2/HO2 ?, OH? at carbon electrodes. The reaction mechanism is: $$\begin{array}{*{20}c} {O_2 + e^ - \rightleftarrows O_2 } \\ {O_{2^ - } + H_2 O \rightleftarrows HO_2 + OH - } \\ {HO_2 + e^ - \rightleftarrows HO_{2^ - } } \\ \end{array} $$ . 相似文献
52.
Ch. Ottinger 《Chemical physics》1973,1(2):161-171
Collision-induced rotational transitions in the electronically excited NaLi molecule have been studied using laser excited fluorescence. Due to the greater number of allowed transitions as compared with Na2 and Li2, more cases were found of transitions +ΔJ and ?ΔJ having greatly different cross sections (“+/ - asymmetry”). This observation is in agreement with recent predictions on the basis of Born's approximation. All observed transitions are classified according to the symmetry of the contributing potential terms. Data are presented which indicate the necessity for refinements of the theory. 相似文献
53.
Ch. Bheemasankara Rao V. Venkateswarlu 《Fresenius' Journal of Analytical Chemistry》1963,198(2):183-184
Summary Embelin is employed as a reagent for the gravimetric individual estimation of alkaline earth metals and magnesium.
Part III: Z. analyt. Chem. 185, 216 (1962). 相似文献
Zusammenfassung Zur gravimetrischen Einzelbestimmung von Magnesium und den Erdalkalien wird Embelin als Reagens empfohlen.
Part III: Z. analyt. Chem. 185, 216 (1962). 相似文献
54.
Zusammenfassung Monomere Phosphinimine der allgemeinen Formel C6H5N= =PCl
n
(NEt2)3-n
(n=0,1,2) lassen sich (I) aus dimerem Phenylimino-phosphorsäure-trichlorid und Diäthylamin in Gegenwart eines Chlorwasserstoffakzeptors und (II) durch Reaktion der Phosphine PCl
n
(NEt2)3-n
mit Phenylazid darstellen. Die Phosphorane Et2NPCl4, (Et2N)2PCl3 und (Et2N)3PBr2 reagieren mit Anilin nicht zu Phenylimino-Verbindungen. Durch alkalische Hydrolyse von C6H5N=PCl(NEt2)2 entsteht das Phosphorsäure-bis[diäthylamino]-anilid. Die IR- und1H- und31P-NMR-Spektren der Verbindungen werden mitgeteilt.
Mit 1 Abbildung 相似文献
Monomeric phosphinimines of the general formula C6H5N= =PCl n (NEt2)3-n (n=0,1,2) are formed (I) from dimeric phenyliminophosphoricacid-trichloride and diethylamine in the presence of a HCl-acceptor and (II) by reacting the phosphines PCl n (NEt2)3-n with phenylazide. The phosphoranes Et2NPCl4, (Et2N)2PCl3 and (Et2N)3PBr2 do not give the corresponding phenylimines with aniline. Alkaline hydrolysis of C6H5N= =PCl(NEt2)2 gives bis[diethylamino]-anilido-phosphinoxid. IR-,1H- and31P-NMR-spectra are given.
Mit 1 Abbildung 相似文献
55.
I. V. Ajinenko Y. A. Belokopitov A. A. Borovikov P. V. Chliapnikov Z. C. Garutchava L. N. Gerdyukov S. A. Gumenuk V. V. Kniazev A. I. Kurnosenko L. V. Orekhova L. P. Petrovikh V. N. Riadovikov A. G. Tomaradse V. A. Uvarov A. P. Vorobjev N. S. Amaglobely Ch. S. Chochiachvili M. Barth E. A. De Wolf M. Van Immerseel F. Verbeure CERN - USSR Collaboration 《Zeitschrift fur Physik C Particles and Fields》1984,25(2):103-114
We present final results on inclusive production ofK *+(890),K *+(1430) andK *?(890) in \(\bar K^ + p\) interactions at 32 GeV/c, based on a statistics of ~27 events/μb. Total cross sections,p T -andx-dependence of inclusive distributions are compared with experiments at other energies and with the Lund fragmentation model. Spin density matrix elements of theK *+(890) are also discussed. The results suggest that “recombination” of both initial state valence quarks \(\bar s\) andu of theK + intoK *+(890), responsible in the Lund model for ~45% of theK *+(890) cross section, is strongly suppressed. 相似文献
56.
I. V. Ajinenko P. V. Chliapnikov V. P. Falaleev Z. C. Garutchava L. N. Gerdyukov V. V. Kniazev A. I. Kurnosenko T. G. Makharadze V. N. Riadovikov A. M. Rybin A. G. Tomaradze O. G. Tchikilev V. F. Tchunikhin V. A. Uvarov A. P. Vorobjev N. S. Amaglobely Ch. S. Chochiachvili M. D. Tabidze M. Barth E. A. De Wolf M. Van Immerseel F. Verbeure CERN-USSR Collaboration 《Zeitschrift fur Physik C Particles and Fields》1984,23(4):307-331
The production properties ofK s 0 , \(\bar \Lambda\) andK + p interactions at 32 GeV/c are investigated using the final statistics of the experiment. We present total and semi-inclusive cross sections and aver-age multiplicities. Estimates are given of the diffractive dissociation contributions to total and differential cross sections. Thex-,p T ?, and transverse mass dependence of inclusive and semi-inclusive distributions is discussed as well as properties of “prompt”K s 0 's. The ratio of “prompt”K 890 + (K 890 0 ) to “prompt”K 0 cross sections is measured to be 1.03±0.12 (0.98±0.17). From a comparison of \(\bar \Lambda\) production inK ± p interactions at 32 GeV/c, we estimate a strange sea-quark suppression of 0.26 ±0.02. The double differential cross sections ofK s 0 's is studied as a function of Feynman-x andp T 2 , and a Triple-Regge fit performed. The data are compared in detail to versions of the Lund-model for low-p T hadronic collisions. 相似文献
57.
H. Huber Ch. Koeberl I. McDonald W.U. Reimold 《Journal of Radioanalytical and Nuclear Chemistry》2000,244(3):603-607
We used - coincidence spectrometry to investigate the possible presence of a meteoritical component in 27 samples of South African diamictites. Recently, several studies have suggested that some tillites/diamictites may represent impact breccias, but a petrographical study by our group found no evidence for the presence of impact-characteristic shocked minerals. The siderophile elements, such as Cr, Co, Ni, and, especially, the platinum group elements, have high abundances in meteorites, but low abundances in terrestrial crustal rocks. The Ir content of the diamictites was measured with the new iridium coincidence spectrometer (ICS) at the University of Vienna, with detection limits of around 0.02 ppb. No enrichments in the contents of Ir and other siderophile elements compared to average crustal concentrations were found; thus, no unequivocal evidence for an impact origin of these diamictites of the South African Dwyka Group can be documented. 相似文献
58.
Historical aspects of science are usually confined to special conferences, and receive only a brief mention in the introduction to talks at meetings addressing current topics. However, at the previous Seminar, several theoretical and experimental contributions were made, which discussed the historical development of surface science. Because of the considerable interest aroused by these presentations, we decided to keep the historical spirit alive, by telling the story of photoemission.
While field emission is the oldest area of surface science, photoemission is certainly one of the most important branches. Here, emphasis is placed on the early investigations, which are often scarcely mentioned, and on more recent work that has had significant impact on the progress of surface science. 相似文献
59.
Ch. Berthelot G. Carraro V. Verdingh 《Journal of Radioanalytical and Nuclear Chemistry》1980,60(2):443-451
A large number of toxic elements, including Th and U, in Scheldt and NBS river sediments, have been determined non-destructively
by high energy photon activation. The length of irradiation varies between 1.5 hours for short lived-nuclides and 7–18 hours
for long lived-nuclides. The induced activities are measured using a single open-ended coaxial Ge(Li) detector and the photopeak
integrations are calculated using the total peak area method and the Cutipie computer program after substraction of the intrinsic
background of the detector from each spectrum (Angela program). The photonuclear reactions and the best detection limits for
36 elements are indicated. 相似文献
60.
J. Kvasil I. N. Mikhailov R. Ch. Safarov B. Choriev 《Czechoslovak Journal of Physics》1978,28(8):843-856
Some generalizations of the model for odd nuclei suggested by Kerman are considered. The effects of phonon admixtures on matrix elements of Coriolis interaction are studied. Several schemes are considered for studying the role of non-adiabatic effects in the even-even core.One of the authors B. Ch. thanks L. A.Malov and V. O.Nesterenko for many discussions of some questions connected with the determination of the phonon-quasiparticle admixtures. 相似文献