Results 11 to 20 of about 5,281,681 (332)
, 1970 The theory of near-rings has arisen in a variety of ways. There is a natural desire to generalise the theory of rings and skew fields by relaxing some of their defining axioms.
Holcombe, William Michael Lloyd
core +7 more sources
Air quality, atmosphere and health, 2022 Pollution in the atmosphere, a major problem worldwide, has significantly increased in the last century. Heavy metals have an important component in air pollution.
K. Key, Ş. Kulaç
semanticscholar +1 more source
Wood Science and Technology, 2021 In the woodworking industry, detection of annual rings and location of pith in relation to timber board cross sections, and how these properties vary in the longitudinal direction of boards, is relevant for many purposes such as assessment of shape ...
Tadios Habite +2 more
semanticscholar +1 more source
Radial growth of woody species in the conditions of high anthropogenic load in the city of Krasnoyarsk [PDF]
Сибирский лесной журнал, 2018 The dynamics of radial growth of tree stem developing in changing conditions of the city of Krasnoyarsk was studied. For Krasnoyarsk, The problem of creating an environment favorable for people living in Krasnoyarsk is an urgent issue and its integral ...
Yu. V. Klad’ko, V. E. benkova
doaj +1 more source
Characterizations of rings and modules by means of lattices [PDF]
, 1965 PhDIn this thesis we study the relationship between the lattice of submodules and the algebraic structure of a module. The key remark in our study will be the fact that the homomorphisms between two independent submadules of a module can be ...
Stephenson, W.
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Findings from an in-Depth Annual Tree-Ring Radiocarbon Intercomparison [PDF]
Radiocarbon, 2020 ABSTRACTThe radiocarbon (14C) calibration curve so far contains annually resolved data only for a short period of time. With accelerator mass spectrometry (AMS) matching the precision of decay counting, it is now possible to efficiently produce large datasets of annual resolution for calibration purposes using small amounts of wood.
Wacker, L +32 more
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Growth Rings in the Stem of Thuja orientalis L.
International Journal of Horticultural Science, 2000 During the winter dormancy period of 1998-99, the differentiation process of xylem and the formation of annual and pseudo-annual growth rings was studied in sections of the central stem of Thuja orientalis of different age (1-14 year old), starting from ...
G. Schmidt, Gy. Végvári
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Radiocarbon in annual coral rings of Florida [PDF]
Geophysical Research Letters, 1978 Radiocarbon measurements on a 175‐year (A.D. 1800 to 1974) growth of the coral Montastrea annularis from The Rocks reef off the Florida Keys reveal the rate of local uptake of fossil fuel CO2 and bomb 14C by surface ocean waters of the Gulf Stream. In the nineteenth century, the pre‐bomb, pre‐industrial Δ14C value of surface ocean waters as seen in ...
Druffel, Ellen M, Linick, Timothy W
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, 2006 In this book we define the new notion of neutrosophic rings. The motivation for this study is two-fold. Firstly, the classes of neutrosophic rings defined in this book are generalization of the two well-known classes of rings: group rings and semigroup ...
Vasantha, Kandasamy +2 more
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Wood density within Norway spruce stems
Silva Fennica, 2008 We studied the variation in average wood density of annual rings, earlywood density, and latewood density in addition to ring width and latewood percentage within Norway spruce (Picea abies (L.) Karst.) stems from the pith to the bark, and from the ...
Jyske, Tuula +2 more
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