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Kadomtsev–Petviashvili Hierarchy: Negative Times (2021)

Pogrebkov, Andrei K.

Molecular Diversity Preservation International

In: Mathematics. 2021; 9(16): 1988. Published 2021 Aug 20. doi: 10.3390/math9161988.

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Publikationsdatum: 2021-08-20

Beschreibung: The Kadomtsev–Petviashvili equation is known to be the leading term of a semi-infinite hierarchy of integrable equations with evolutions given by times with positive numbers. Here, we introduce new hierarchy directed to negative numbers of times. The derivation of such systems, as well as the corresponding hierarchy, is based on the commutator identities. This approach enables introduction of linear differential equations that admit lifts up to nonlinear integrable ones by means of the special dressing procedure. Thus, one can construct not only nonlinear equations, but corresponding Lax pairs as well. The Lax operator of this evolution coincides with the Lax operator of the “positive” hierarchy. We also derive (1 + 1)-dimensional reductions of equations of this hierarchy.

Digitale ISSN: 2227-7390

Thema: Mathematik

Publiziert von Molecular Diversity Preservation International

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Evaluation of Dispersion of Lead-Bearing Mine Wastes in Kabwe District, Zambia (2021)

Nakamura, Shinsaku ; Igarashi, Toshifumi ; Uchida, Yoshitaka ; [weitere]

Molecular Diversity Preservation International

In: Minerals. 2021; 11(8): 901. Published 2021 Aug 20. doi: 10.3390/min11080901.

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Publikationsdatum: 2021-08-20

Beschreibung: Dispersion of lead (Pb) in mine wastes was simulated for reproducing Pb contamination of soil in Kabwe District, Zambia. Local weather data of year 2019 were monitored in situ and used for the simulations. The plume model, weak puff model, and no puff model were adopted for calculation of Pb dispersion under different wind conditions. The results showed that Pb dispersion from the Kabwe mine was directly affected by wind directions and speeds in the dry season, although it was not appreciably affected in the rainy season. This may be because the source strength is lower in the rainy season due to higher water content of the surface. This indicates that Pb dispersion patterns depend on the season. In addition, the distribution of the amount of deposited Pb-bearing soils around the mine corresponded to the distribution of Pb contents in soils. These results suggest that Pb contamination in soils primarily results from dispersion of fine mine wastes.

Digitale ISSN: 2075-163X

Thema: Geologie und Paläontologie

Publiziert von Molecular Diversity Preservation International

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On the Lyapunov instability in Newtonian dynamics (2021)

Burgos, J M ; Maderna, E ; Paternain, M

Institute of Physics

In: Nonlinearity. 2021; 34(10): 6719-6726. Published 2021 Aug 18. doi: 10.1088/1361-6544/ac1a1a.

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Publikationsdatum: 2021-08-18

Print ISSN: 0951-7715

Digitale ISSN: 1361-6544

Thema: Mathematik , Physik

Publiziert von Institute of Physics

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A Generic Model to Estimate Ozone Concentration From Landsat 8 Satellite Data Based on Machine Learning Technique (2021)

Yang, Xiaoting ; Zhang, Meng ; Zhang, Bo

Institute of Electrical and Electronics Engineers

In: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. 2021; 14: 7938-7947. Published 2021 Jan 01. doi: 10.1109/jstars.2021.3101206.

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Publikationsdatum: 2021-01-01

Print ISSN: 1939-1404

Digitale ISSN: 2151-1535

Thema: Geologie und Paläontologie

Publiziert von Institute of Electrical and Electronics Engineers

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Low-Cost Air Quality Stations’ Capability to Integrate Reference Stations in Particulate Matter Dynamics Assessment (2021)

Brilli, Lorenzo ; Carotenuto, Federico ; Andreini, Bianca Patrizia ; [weitere]

Molecular Diversity Preservation International

In: Atmosphere. 2021; 12(8): 1065. Published 2021 Aug 19. doi: 10.3390/atmos12081065.

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Publikationsdatum: 2021-08-19

Beschreibung: Low-cost air quality stations can provide useful data that can offer a complete picture of urban air quality dynamics, especially when integrated with daily measurements from reference air quality stations. However, the success of such deployment depends on the measurement accuracy and the capability of resolving spatial and temporal gradients within a spatial domain. In this work, an ensemble of three low-cost stations named “AirQino” was deployed to monitor particulate matter (PM) concentrations over three different sites in an area affected by poor air quality conditions. Data of PM2.5 and PM10 concentrations were collected for about two years following a protocol based on field calibration and validation with a reference station. Results indicated that: (i) AirQino station measurements were accurate and stable during co-location periods over time (R2 = 0.5–0.83 and RMSE = 6.4–11.2 μg m−3; valid data: 87.7–95.7%), resolving current spatial and temporal gradients; (ii) spatial variability of anthropogenic emissions was mainly due to extensive use of wood for household heating; (iii) the high temporal resolution made it possible to detect time occurrence and strength of PM10 concentration peaks; (iv) the number of episodes above the 1-h threshold of 90 μg m−3 and their persistence were higher under urban and industrial sites compared to the rural area.

Digitale ISSN: 2073-4433

Thema: Geologie und Paläontologie

Publiziert von Molecular Diversity Preservation International

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Analysis of Enhanced Geothermal System Development Scenarios for District Heating and Cooling of the Göttingen University Campus (2021)

Romanov, Dmitry ; Leiss, Bernd

Molecular Diversity Preservation International

In: Geosciences. 2021; 11(8): 349. Published 2021 Aug 19. doi: 10.3390/geosciences11080349.

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Publikationsdatum: 2021-08-19

Beschreibung: The huge energy potential of Enhanced Geothermal Systems (EGS) makes them perspective sources of non-intermittent renewable energy for the future. This paper focuses on potential scenarios of EGS development in a locally and in regard to geothermal exploration, poorly known geological setting—the Variscan fold-and-thrust belt —for district heating and cooling of the Göttingen University campus. On average, the considered single EGS doublet might cover about 20% of the heat demand and 6% of the cooling demand of the campus. The levelized cost of heat (LCOH), net present value (NPV) and CO2 abatement cost were evaluated with the help of a spreadsheet-based model. As a result, the majority of scenarios of the reference case are currently not profitable. Based on the analysis, EGS heat output should be at least 11 MWth (with the brine flow rate being 40 l/s and wellhead temperature being 140 °C) for a potentially profitable project. These parameters can be a target for subsurface investigation, reservoir modeling and hydraulic stimulation at a later stage. However, sensitivity analysis presented some conditions that yield better results. Among the most influential parameters on the outcome are subsidies for research wells, proximity to the campus, temperature drawdown and drilling costs. If realized, the EGS project in Göttingen might save up to 18,100 t CO2 (34%) annually.

Digitale ISSN: 2076-3263

Thema: Geologie und Paläontologie

Publiziert von Molecular Diversity Preservation International

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There are no σ-finite absolutely continuous invariant measures for multicritical circle maps * (2021)

de Faria, Edson ; Guarino, Pablo

Institute of Physics

In: Nonlinearity. 2021; 34(10): 6727-6749. Published 2021 Aug 18. doi: 10.1088/1361-6544/ac1a02.

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Publikationsdatum: 2021-08-18

Print ISSN: 0951-7715

Digitale ISSN: 1361-6544

Thema: Mathematik , Physik

Publiziert von Institute of Physics

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An Automatic Cloud Detection Neural Network for High-Resolution Remote Sensing Imagery With Cloud-Snow Coexistence (2021)

Chen, Yang ; Weng, Qihao ; Tang, Luliang ; [weitere]

Institute of Electrical and Electronics Engineers

In: IEEE Geoscience and Remote Sensing Letters. 2021; 1-5. Published 2021 Jan 01. doi: 10.1109/lgrs.2021.3102970. [early online release]

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Publikationsdatum: 2021-01-01

Print ISSN: 1545-598X

Digitale ISSN: 1558-0571

Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie

Publiziert von Institute of Electrical and Electronics Engineers

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Sequential Extraction and Risk Assessment of Potentially Toxic Elements in River Sediments (2021)

Matabane, Dithobolong L. ; Godeto, Taddese W. ; Mampa, Richard M. ; [weitere]

Molecular Diversity Preservation International

In: Minerals. 2021; 11(8): 874. Published 2021 Aug 12. doi: 10.3390/min11080874.

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Publikationsdatum: 2021-08-12

Beschreibung: In this study, the sequential extraction method was applied to extract selected potentially toxic elements (PTEs) (Cd, Cr, Cu, Fe, Ni, Pb and Zn) in river sediments collected from the Blood River situated in Seshego area, Limpopo Province, South Africa. The study aimed to assess a possible trend of mobilisation of these elements from sediment to water. The accuracy of the sequential extraction method was confirmed by analysing sediment-certified reference material, and quantitative percentage recoveries ranging from 86 to 119%, 81 to 111% and 77 to 119% were achieved for exchangeable, reducible and oxidisable fractions, respectively. The potential risk of the PTEs in sediments was evaluated. The calculated values of contamination factor (CF) as well as risk assessment code (RAC) for Cd, Cu, Ni and Pb revealed the mobility of these elements. The PTEs in river sediments are at a high toxicity-risk level and could therefore cause a threat to organisms dwelling in sediments and humans via consumption of crops irrigated with the polluted river water.

Digitale ISSN: 2075-163X

Thema: Geologie und Paläontologie

Publiziert von Molecular Diversity Preservation International

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