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Extraction of Mechanical-Reactivity Influences from Neutron Noise Spectra at the IBR-2 Reactor

Chinese Physics Letters 2013年第7期30卷 51-55页

作者： M.Dima Yu.Pepelyshev Institute for Physics and Nuclear Engineering DFCTIRomania Joint Institute for Nuclear Research FLNPRU-141980 DubnaMoscowRussia

Neutron noise spectra in nuclear reactors are a convolution of multiple-induced *** the IBR-2 pulsed reactor(jinr-Dubna),one part is represented by the reactivities induced by the two moving reflectors,and the other part by other sources that are moderately *** the present study,using recordings of the mechanical noise of the two moving reflectors,their non-linear correlations into the power spectra of the reactor are extracted using statistical *** remaining noise sources are moderately stable noise and can be further monitored by other automated reactor diagnoses.

关键词： spectra moving recording

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Neutron Activation Analyses Used to Study Elemental Accumulation in Some Marine Macrophytes (Mediterranean Sea Coast of Egypt)

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American Journal of Analytical Chemistry 2017年第6期8卷 395-405页

作者： N. Nassar A. Kravtsova M. Frontasyeva M. M. Sherif Department of Physics Faculty of Science Cairo University Giza Egypt flnp jinr Dubna Russia The A.O. Kovalevsky Institute of Marine Biological Research of RAS Sevastopol Russia

The concentrations of Na, Mg, Al, S, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, As, Se Br, Rb, Sr, Zr, Mo, Ag, Sb, I, Cs, Ba, La, Sm, Eu, Tb, Yb, Hf, Ta, W, Au, Th and U in 6 types of marine macrophytes (algae and seagrass): Gelidium pusillum (Stackhouse) Le Jolis, Ulva intestinalis Linnaeus, Amphiroa rigida J.V. Lamouroux, Hypnea sp., Cystoseira sp. and Posidonia oceanica (L.) Delile (seagrass) collected from 3 stations along the Mediterranean Sea coast of Egypt were determined using instrumental neutron activation analysis. The contents of elements in marine macrophytes indicated that they accumulated elements at different levels depending on their type of species (brown, red, green and seagrass) and the ambient water conditions. However, the concentrations of Cr, Co, Ni, Se, Zr, Mo, Ag, Cs, La, Sm, Eu, Yb, Hf, Ta, Au and U were very similar in all samples. In general the levels of classically investigated elements, particularly Mn, Fe, Co, Ni and Zn determined in the macrophytes in the present study are lower or within the wide range of values previously reported for species of these genera sampled along the Egyptian Mediterranean coast.

关键词： Algae and Seagrass Elemental Analysis Mediterranean Sea Neutron Activation Analysis

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