Wyniki wyszukiwania - Biblioteka Nauki

1

Subdiffusion of volcanic earthquakes

100%

Abe S. , Suzuki N.

Acta Geophysica

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2017

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tom Vol. 65, no. 3

481--489

EN

A comparative study is performed on volcanic seismicities at Icelandic volcano, Eyjafjallajökull, and Mt. Etna in Sicily from the viewpoint of complex systems science, and the discovery of remarkable similarities between them is reported. In these seismicities as point processes, the jump probability distributions of earthquakes (i.e., distributions of the distance between the hypocenters of two successive events) are found to obey the exponential law, whereas the waiting-time distributions (i.e., distributions of inter-occurrence time of two successive events) follow the power law. A careful analysis is made about the finite size effects on the waiting-time distributions, and the previously reported results for Mt. Etna (Abe and Suzuki 2015) are reinterpreted accordingly. It is shown that the growth of the seismic region in time is subdiffusive at both volcanoes. The aging phenomenon is commonly observed in the “event-time-averaged” mean-squared displacements of the hypocenters. A comment is also made on (non-)Markovianity of the processes.

2

Neuro-endocrine-immune axis in human rheumatoid arthritis

100%

Sakane T. , Suzuki N.

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nr 5

3

Climate-related variability and stock - recruitment relationship of the North Pacific Albacore tuna

80%

Singh A. A. , Sakuramoto K. , Suzuki N. , Alok K.

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2018

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tom 33

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nr 1

EN

The stock-recruitment relationship is biological in nature and it is evident that one affects the other. However, fish life cycle, growth, abundance and distribution is dependent on a complex relation with various biotic and abiotic variables inclusive of environmental factors. The stock-recruitment relationship and environmental influences was investigated for the North Pacific albacore tuna (Thunnus alalunga). Statistical investigation revealed the presence of different density-dependent effects in the relationships of recruits per spawning biomass (RPS) and recruitment (R) against the female spawning stock biomass (SSB). Significant relationship of R, RPS and SSB were determined with the sea surface temperature (SST), Pacific Decadal Oscillation (PDO) and multivariate El Niño Southern Oscillation (ENSO), with SST being the principal variable. This makes the stock recruitment behavior multidimensional. The results suggest significant influence of the environmental conditions on the stock recruitment relationship of the North Pacific albacore tuna including a possible regime shift

PL

Modele stado – uzupełnienie wyjaśniają jedynie pewną część obserwowanej wariancji rekrutacji. Cykl życiowy, tempo wzrostu, liczebność i rozmieszczenie ryb wiążą się z różnymi zmiennymi biotycznymi i abiotycznymi, w tym z czynnikami klimatycznymi. W pracy zbadano proces naturalnej rekrutacji w zależności od zmieniających się parametrów środowiska. Wyniki wskazują na istotny wpływ warunków klimatycznych na zależność stado – uzupełnienie

4

Development of simple analytical methods of polychlorinated biphenyls in human serum by gas chromatography negative ion chemical ionization quadrupole mass spectrometry

70%

Eguchi A. , Enomoto T. , Suzuki N. , Okuno M. , Mori C.

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tom Vol. 29, no. 4

503--506

EN

In this study, we developed a highly sensitive, robust method for determining 12 congeners of two to ten chlorinated polychlorinated biphenyls (PCBs) in serum samples using gas chromatography (GC)–mass spectrometry (MS) operating in selected ion monitoring mode (SIM: m/z 35) with negative ion chemical ionization (NICI), and the results were compared with those from GC coupled with high-resolution MS (HRMS) with electron impact (EI). The recovery rates of the surrogate PCB congeners were 97.2%–112% (coefficient of variation: 5.3%–8.5%), and the method detection limits for PCBs in each matrix obtained by GC–NICI–quadrupole mass spectrometry (qMS) were 1.9–20 pg g−1 wet wt. The analytical values of the target compounds in the samples analyzed by GC–NICI–qMS and GC–EI–HRMS were comparable (Passing–Bablok regression: R = 0.888–0.967), and the analytical values obtained via GC–NICI–qMS were almost comparable with those of the certified serum samples from National Institute of Standards and Technology (NIST: SRM1957), indicating that GC–NICI–qMS is suitable for the analysis of tetra- to hepta-chlorinated PCBs in serum samples.