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1.
2.
S. Zecevic B. Simic-Glavaski E. Yeager A.B.P. Lever P.C. Minor 《Journal of Electroanalytical Chemistry》1985,196(2):339-358
Cyclic voltammetric measurements of adsorbed Fe- and Co-tetrasulfonated phthalocyanine (TsPc) and Co-phthalocyanine (Pc) have been carried out on ordinary pyrolytic graphite and silver electrodes at different solution pH ranging from 1 to 13. Many voltammetric peaks were found to be pH dependent with a slope of ?59 mV/ unit pH. In some instances this dependence was observed in alkaline or acid solutions only. The influence of oxygen has been also examined. 相似文献
3.
Pinheiro JP Minor M van Leeuwen HP 《Langmuir : the ACS journal of surfaces and colloids》2005,21(19):8635-8642
In this work we propose a dynamic metal speciation theory for colloidal systems in which the complexing ligands are localized on the surface of the particles; i.e., there is spatial heterogeneity of binding sites within the sample volume. The differences between the complex formation and dissociation rate constants of complexes in colloidal dispersions and those in homogeneous solutions originate from the differences in kinetic and mass transport conditions. In colloidal systems, when the effective rate of dissociation of the surface complexes becomes fully diffusion controlled, its value is defined via the geometrical parameters of the particle. We assess the extent to which the conventional approach of assuming a homogeneously smeared-out ligand distribution overestimates the lability of surface complexes in colloidal ligand dispersions. The validity of the theory is illustrated by application to binding of lead and cadmium by carboxyl modified latex particles: our approach correctly predicts the formation/dissociation rate constants, which differ by several orders of magnitude from their homogeneous solution counterparts. 相似文献
4.
M. M. Minor W. K. Hensley M. M. Denton S. R. Garcia 《Journal of Radioanalytical and Nuclear Chemistry》1982,70(1-2):459-471
An automated delayed neutron counting and instrumental neutron activation analysis system has been developed at Los Alamos
National Laboratory's Omega West Reactor (OWR) to analyze samples for uranium and 31 additional elements with a maximum throughput
of 400 samples per day. The system and its mode of operation for a large reconnaissance survey will be described. 相似文献
5.
Jung Bin In Bin Xiang David J. Hwang Sang-Gil Ryu Eunpa Kim Jae-Hyuck Yoo Oscar Dubon Andrew M. Minor Costas P. Grigoropoulos 《Applied Physics A: Materials Science & Processing》2014,114(1):277-285
We observe laser-induced grain morphology change in silicon nanopillars under a transmission electron microscopy (TEM) environment. We couple the TEM with a near-field scanning optical microscopy pulsed laser processing system. This novel combination enables immediate scrutiny on the grain morphologies that the pulsed laser irradiation produces. We find unusual transformation of the tip of the amorphous or polycrystalline silicon pillar into a single crystalline domain via melt-mediated crystallization. On the basis of the three-dimensional finite difference simulation result and the dark field TEM data, we propose that the creation of the distinct single crystalline tip originates from the dominant grain growth initiated at the apex of the non-planar liquid–solid interface. Our microscopic observation provides a fundamental basis for laser-induced conversion of amorphous nanostructures into coarse-grained crystals. 相似文献
6.
E. D. Minor T. A. Armstrong R. Bishop V. Harris R. A. Lewis G. A. Smith 《Zeitschrift für Physik A Hadrons and Nuclei》1990,336(4):461-468
The momentum spectra of charged pions following antiproton annihilation at rest in carbon and uranium have been measured. This information complements our previous measurement of the neutral pion spectra. The total charged pion multiplicity is 2.84±0.10 and 2.47±0.09 for carbon and uranium, respectively, in good agreement with recent INC model predictions of 2.96 and 2.48 for the same quantities. However, structures predicted by the model near 200 MeV/c and 300 MeV/c related to delta-resonance production are not seen in the data. The total energy transfers to the nucleus are calculated to be 119±59 MeV(carbon) and 455±50 MeV(uranium). The possibility of exciting multifragmentation with a¯p beam impinging on heavy nuclei is discussed. 相似文献
7.
E. D. Minor T. A. Armstrong B. Chen R. A. Lewis G. A. Smith 《Zeitschrift für Physik A Hadrons and Nuclei》1992,342(4):447-454
Spectra of protons with momenta greater than 500 MeV/c following antiproton annihilation at rest in carbon and uranium nuclei have been measured. They are compared to recent results from other experiments and to predictions of an intranuclear cascade model. Evidence is presented for a substantialB>0 component in the annihilation process, and an estimate of the magnitude of that component is made. 相似文献
8.
T. A. Armstrong R. Bishop V. Harris R. A. Lewis E. Minor G. A. Smith 《Zeitschrift für Physik A Hadrons and Nuclei》1988,331(4):519-520
We have observed low energy nuclear gamma-rays, which we interpret as coming from fission fragments, from antiproton annihilation at rest in a uranium target. The high gamma-ray and previously reported fission neutron temperatures, as well as large relative neutron-to-gamma ray yields, suggest a high level of excitation of the fission fragments. 相似文献
9.
We study the geometry of the second fundamental form of pseudohermitian immersions among nondegenerate CR manifolds. In particular we study existence and uniqueness of pseudohermitian immersions $\phi : M \rightarrow S^{2n+3}$ of a strictly pseudoconvex CR manifold $M$ into an odd dimensional sphere, as determined by the pseudohermitian Gauss and Weingarten equations. 相似文献
10.