Most viewed papers

661. Olchev A.V.
     A modeling approach to estimate the gross and net primary production of forest ecosystems as a function of the fraction of absorbed photosynthetically active radiation
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 345-353

     A simple non-linear model allowing to calculate daily and monthly GPP and NPP of forests using parameters characterizing the light-use efficiencies for GPP and NPP, and integral values of absorbed photosynthetically active radiation, obtained using field measurements and remotes sensing data was suggested. Daily and monthly GPP, NPP of the forest ecosystems were derived from the field measurements of the net ecosystem exchange of CO₂ in the spruce and tropical rain forests using a process-based Mixfor-SVAT model.

     Keywords: gross and net primary production, tropical rainforests, spruce forests, SVAT model, light use efficiency, remote sensing.
     Views (last year): 1. Citations: 2 (RSCI).
662. Molchanov A.G., Olchev A.V.
     Model of CO₂ exchange in a sphagnum peat bog
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 369-377

     A simple model was developed to describe the dependence of net CO₂ exchange in a sphagnum peat bog as a function of incoming solar radiation, air temperature, and soil moisture. It was parameterized using the field measurement data from two neighboring sites in an undisturbed peat bog (the pine mire with shrub and sphagnum and the shrub-sphagnum mire with rare pine) in Moscow Region. Measurements were conducted during the second part of the growing season, when the groundwater level was below 30 cm. It was shown that is a key parameter influencing the photosynthesis and respiration rates of a sphagnum moss and peat soil. The developed model allows to explain from 71 % to 74 % of the variation of CO₂ exchange in the peat bog.

     Keywords: Sphagnum, peat bog, photosynthesis, respiration, model of CO₂ exchange, ground water level.
     Views (last year): 1. Citations: 3 (RSCI).
663. Zamolodchikov D.G.
     Forecasting the global temperature increase for the XXI century by means of a simple statistical model
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 379-390

     A simple statistical model is developed for the dynamics of the mean global annual temperature. The model combines the logarithmic effect of carbon dioxide concentration increase and the input by climatic cycles. Model parameters are determined from data of instrumental observations for 1850–2010. The model confirms the presence of climatic cycles with the period of 10.5 and 68.8 years in the global temperature dynamics. The trajectories of the global temperature changes for the XXI century are obtained under the scenarios of carbon dioxide concentration changes from the 5^th IPCC Assessment Report. The comparison revealed that the global temperature trajectories from the Report are 0.9–1.8 °C above those obtained in the model.

     Keywords: Global Climate Change, carbon dioxide, statistical model, projection, climatic cycles.
     Views (last year): 1.
664. Editor's note
     Computer Research and Modeling, 2017, v. 9, no. 5, pp. 673-675
     Views (last year): 1.
665. Editor's note
     Computer Research and Modeling, 2016, v. 8, no. 5, pp. 719-720
     Views (last year): 1.
666. Kirilyuk I.L.
     The discrete form of the equations in the theory of the shifting mode of reproduction with different variants of financial flows
     Computer Research and Modeling, 2016, v. 8, no. 5, pp. 803-815

     Different versions of the shifting mode of reproduction models describe set of the macroeconomic production subsystems interacting with each other, to each of which there corresponds the household. These subsystems differ among themselves on age of the fixed capital used by them as they alternately stop production for its updating by own forces (for repair of the equipment and for introduction of the innovations increasing production efficiency). It essentially distinguishes this type of models from the models describing the mode of joint reproduction in case of which updating of fixed capital and production of a product happen simultaneously. Models of the shifting mode of reproduction allow to describe mechanisms of such phenomena as cash circulations and amortization, and also to describe different types of monetary policy, allow to interpret mechanisms of economic growth in a new way. Unlike many other macroeconomic models, model of this class in which the subsystems competing among themselves serially get an advantage in comparison with the others because of updating, essentially not equilibrium. They were originally described as a systems of ordinary differential equations with abruptly varying coefficients. In the numerical calculations which were carried out for these systems depending on parameter values and initial conditions both regular, and not regular dynamics was revealed. This paper shows that the simplest versions of this model without the use of additional approximations can be represented in a discrete form (in the form of non-linear mappings) with different variants (continuous and discrete) financial flows between subsystems (interpreted as wages and subsidies). This form of representation is more convenient for receipt of analytical results as well as for a more economical and accurate numerical calculations. In particular, its use allowed to determine the entry conditions corresponding to coordinated and sustained economic growth without systematic lagging in production of a product of one subsystems from others.

     Keywords: fixed assets, depreciation, shifting mode of reproduction, coordinated economic growth, discrete mapping.
     Views (last year): 1. Citations: 4 (RSCI).

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