Article
Physics, Fluids & Plasmas
Stefan Tirkas, Haotian Chen, Gabriele Merlo, Frank Jenko, Scott Parker
Summary: The derivation of an intermediate-scale gyrokinetic-electron theory in nonuniform tokamak plasmas reveals the coupling between electron-temperature-gradient (ETG) modes and zonal flow (ZF) modes. This coupling occurs at wavelengths much shorter than the ion gyroradius but much longer than the electron gyroradius. Electron-scale gyrokinetic simulations confirm the predicted generation of ZF and regulation of ETG modes by ZF. The results demonstrate the important role of ETG-ZF coupling in regulating electron heat flux transport.
Article
Construction & Building Technology
Bo Lan, Zhun (Jerry) Yu, Pei Zhou, Gongsheng Huang
Summary: This paper proposes an optimal zoning method for large-scale spaces, which significantly reduces the number of zones and improves accuracy by compromising model accuracy and computational efficiency. Experimental results demonstrate the reliability of the proposed method.
BUILDING AND ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Mengxia Lyu, Xianan Jiang, Zhiwei Wu, Daehyun Kim, Angel F. Adames
Summary: The study found that there is no significant long-term trend in the propagation speed of the Madden-Julian Oscillation (MJO) in boreal winter over the past century. However, there is pronounced year-to-year variability in the phase speed of MJO, with faster propagation associated with larger zonal-scale circulation and anomalous increases in sea surface temperatures and precipitable water in the western Indian Ocean and central/eastern Pacific. The key processes determining the zonal-scale of MJO organization remain open for further investigation.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
M. A. Rogov, I. V. Panchenko, L. E. Augland, V. B. Ershova, V. Yu. Yashunsky
Summary: This study provides the first reliable geochronological data from the West Siberia sedimentary basin to determine the age of the Tithonian/Berriasian (T/B) boundary. The dating of zircon grains derived from a tuff bed shows ages between 141.83 and 141.11 Ma, suggesting a re-consideration of the currently accepted age of the T/B boundary.
Article
Physics, Fluids & Plasmas
Haotian Chen, Stefan Tirkas, Scott E. Parker
Summary: The study investigates the nonlinear equations for zonal flow generation in nonuniform tokamak plasmas based on gyrokinetic theory. The research clarifies the physics behind the three stages of zonal flow generation process and finds that zonal flows are more easily excited in intermediate-scale electron temperature gradient turbulence compared to the short wavelength regime.
Article
Engineering, Electrical & Electronic
Daniele Bosich, Massimiliano Chiandone, Giorgio Sulligoi, Andrea Alessia Tavagnutti, Andrea Vicenzutti
Summary: Integrated power and energy systems are crucial for complex electric ship operations, with medium voltage dc (MVDC) electrical power distribution and zonal electrical distribution system (ZEDS) providing the required flexibility and functional integration advantages. This study presents a megawatt-scale test facility of an MVDC ZEDS, demonstrating its capability to support large and fast load variations while maintaining acceptable voltage tolerances.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Construction & Building Technology
Yanyu Lu, Jiankai Dong, Zhaojun Wang, Yanling Wang, Qing Wu, Lu Wang, Jing Liu
Summary: A practical zonal stack ventilation method was proposed to improve thermal environment in large spaces. Experimental verification was conducted to prove the effectiveness of the method by combining models with realistic environmental conditions.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Meteorology & Atmospheric Sciences
S. Elnaz Naghibi, Sergey A. Karabasov, Igor Kamenkovich
Summary: A reduced-order semi-analytic model of multiple zonal jets in the Southern Ocean is proposed based on statistical approach and scale decomposition. The model utilizes two dominant scales in the vorticity equation to capture large-scale and mesoscale dynamics with explicit momentum dissipation. Its validity and physical insights are confirmed through comparison with solutions from two eddy-resolving ocean models: a realistic primitive-equation HYCOM simulation and an idealized quasi-geostrophic model of a shear-driven channel flow.
Article
Meteorology & Atmospheric Sciences
Paulo H. R. Calil
Summary: Eastward zonal jets at intermediate depths connect the oxygen-rich western boundary with the oxygen minimum zones on the eastern boundary. Low horizontal resolution in climate models leads to inaccuracies in representing these jets. Increasing resolution improves the representation of the jets and the oxygen minimum zones.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Julia N. Savelieva, Olga Shurekova
Summary: The study of Upper Jurassic deposits near the village of Valy in the Syzran district, Samara region, reveals a detailed biostratigraphic analysis with the identification of zones, subzones, and biohorizons. The findings include the establishment of specific zones in different periods of the Upper Jurassic, as well as the discovery of unique fossilized corals and warm-water taxa in certain layers, suggesting deposition during short-term warming events. The analysis also provides insights into the paleo-ecological conditions of the region, indicating sediment accumulation in warm shallow eutrophic basins with gradual changes in eutrophy over time.
VESTNIK OF SAINT PETERSBURG UNIVERSITY EARTH SCIENCES
(2021)
Article
Meteorology & Atmospheric Sciences
Nan Lin, Song Yang, Qiaoling Ren, Tuantuan Zhang, Ho-Nam Cheung
Summary: This study investigates the interannual variations of the intensity, meridional shift, and zonal shift of the Aleutian Low (AL) and their associated dynamical processes. The results show that the changes in AL are strongly correlated with the Pacific-North American pattern, the West Pacific pattern, and the Tropical/Northern Hemisphere pattern. The intensity variation of AL in winter is closely associated with the ENSO-related atmosphere-ocean processes in the previous autumn.
ATMOSPHERIC RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Andreas G. Vlachos, Pandelis N. Biskas
Summary: This paper presents a novel model for solving the flow-based market coupling problem in multi-zonal spot electricity markets. It considers a hybrid network configuration with zonal market layer and nodal physical layer, providing optimal supply/demand cleared quantities and zonal exchanges. The model retains the intuitiveness of zonal exchanges and exhibits a dynamic/optimal allocation of zonal to nodal volumes.
ELECTRIC POWER SYSTEMS RESEARCH
(2021)
Article
Thermodynamics
Clara Iacovano, Alessandro d'Adamo, Stefano Fontanesi, Giovanni Di Ilio, Vesselin Krassimirov Krastev
Summary: This paper presents a comprehensive zonal URANS/LES methodology for multidimensional simulation of modern direct-injection engines, with a focus on balancing computational costs and accuracy. Updates include a specific near-wall treatment to maintain full-URANS behavior in the first near-wall cells. Results demonstrate the methodology's effectiveness for analyzing cycle to cycle variability in direct-injection engines.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Computer Science, Interdisciplinary Applications
Paul G. Tucker
Summary: This paper outlines the extensive multi-scale and multi-physics challenges when simulating future aircraft, and offers strategies to help deal with these challenges, including hierarchical, zonal handling of turbulence and geometry. Modelling of geometry is necessary to deal with the coupled nature of aerodynamic problems and increasing levels of geometrical complexity. The proposed unified framework could be utilized for preliminary design to final numerical test involving various hierarchical components.
ENGINEERING COMPUTATIONS
(2021)
Article
Mathematics
Jimmy He
Summary: The characteristic map for the symmetric group has an isomorphism relationship with symmetric functions, and a similar isomorphism exists for the symmetric space of symplectic forms over a finite field. Parabolic induction has an interpretation as a certain multiplication of symmetric functions. These results have applications in the Schur positivity of skew Macdonald polynomials and combinatorial formulas for spherical function values.
INTERNATIONAL MATHEMATICS RESEARCH NOTICES
(2022)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Aleksandr A. Mironenko
Summary: Comments are provided on a published paper discussing the finding of large-sized ammonite lower jaws claimed to be the largest Jurassic aptychi known. However, inaccuracies in specimen identification led to the incorrect age definition. The study highlights the evolutionary trends of aspidoceratids and the preservation potential of Laevaptychi compared to other Jurassic aptychi.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geography, Physical
Kseniya Mikhailova, Mikhail Rogov, Victoria Ershova, Oleg Vereshchagin, Olga Shurekova, Anna Feodorova, Victor Zakharov
Summary: This study describes glendonites of Middle-Late Jurassic to Early Cretaceous age from the Barents Shelf, including the first discovery of Late Barremian-Early Aptian age glendonites. The detailed mineralogical-geochemical and isotopic studies revealed differences in composition between different types of calcite in the pseudomorphs.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Kseniia Vasileva, Nataliya Zaretskaya, Victoria Ershova, Mikhail Rogov, Lisa D. Stockli, Daniel Stockli, Vadim Khaitov, Fedor Maximov, Irina Chernyshova, Natalia Soloshenko, Nikolay Frishman, Taras Panikorovsky, Oleg Vereshchagin
Summary: This study examines glendonites from the White Sea and sheds new light on the paleogeographic and geochemical environments during their formation. The findings show that White Sea glendonites are the youngest known glendonites and can be used as a proxy for near-freezing bottom water temperatures during the cold winter months.
Article
Geochemistry & Geophysics
Victoria Ershova, Andrei Prokopiev, Daniel Stockli, Mikhail Kurapov, Natalia Kosteva, Mikhail Rogov, Andrei Khudoley, Eugeny O. Petrov
Summary: The study of the Mesozoic succession in Franz Josef Land has provided new insights into the stratigraphy and geological history of the Arctic region. Analysis of pebbles and cobbles from conglomerates suggests the presence of pre-Mesozoic metasandstones intruded by Late Paleozoic granites and overlain by Carboniferous-Permian sedimentary deposits in the NE Barents Sea. The age analysis of detrital zircons reveals Precambrian to Early Mesozoic grains, with a significant Late Triassic exhumation event. Comparisons with other Arctic regions suggest an active sediment supply across the Barents Sea Basin during the Late Triassic-Jurassic, indicating significant tectonic activity and sediment transport pathways reorganization.
Article
Geosciences, Multidisciplinary
Mikhail Rogov, Victoria Ershova, Carmen Gaina, Oleg Vereshchagin, Kseniia Vasileva, Kseniia Mikhailova, Alexey Krylov
Summary: Ikaite is a metastable calcium carbonate hexahydrate that occurs naturally in cold water environments. Its suitability as a paleotemperature indicator is still debated. Using a global glendonite database, we reconstructed their distribution through geologic time and found that early Paleozoic glendonites were restricted to the Baltic paleobasin, while Carboniferous-Permian occurrences were associated with the Late Paleozoic Ice Age. Mesozoic glendonites were confined to polar or near-polar regions, and Paleogene-Neogene occurrences were found in the middle and high latitudes of the northern hemisphere.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
M. A. Rogov, I. V. Panchenko, L. E. Augland, V. B. Ershova, V. Yu. Yashunsky
Summary: This study provides the first reliable geochronological data from the West Siberia sedimentary basin to determine the age of the Tithonian/Berriasian (T/B) boundary. The dating of zircon grains derived from a tuff bed shows ages between 141.83 and 141.11 Ma, suggesting a re-consideration of the currently accepted age of the T/B boundary.
Article
Geology
D. N. Kiselev, M. A. Rogov
Summary: The study of new sections in the Upper Volgian substage near Vasilyevskoye village in Rybinsk district clarified the lower boundary and infrazonal division of the Volgidiscus singularis Zone. The lower part of the Singularis Zone was previously not characterized by ammonites, but this study established the sequence of craspeditins ammonites (Volgidiscus and Anivanovia) and identified a new Volgidiscus cf. lamplughi biohorizon. The lower boundary of the Singularis Zone in the Chudinovian Formation sections is determined by the first occurrence of Volgidiscus above the Craspeditesmilkovensis biohorizon. The infrazonal volume of the Singularis Zone is represented by three biohorizons: V. cf. lamplughi, V. pulcher, and V. singularis. Currently, the Singularis Zone has the most complete structure in the Panboreal Superrealm, making it a standard for the upper part of the Upper Volgian substage.
STRATIGRAPHY AND GEOLOGICAL CORRELATION
(2023)
Article
Biodiversity Conservation
Mikhail Rogov, Aleksandr Mironenko, Alexey Ippolitov, Oleg Lutikov
Summary: In this paper, the discovery of several coleoid jaws in the lower Toarcian black shales along the Vilyui River (Yakutia, Russia) is described. It is the first time that a Lower Jurassic coleoid jaw has been recorded outside Europe, and the first report of such a finding from the Mesozoic in Siberia. The preservation and morphology of the described coleoid jaws are similar to the coeval jaws previously reported from Europe, which is made possible by the widespread occurrence of black shale facies associated with the early Toarcian oceanic anoxic event (TOAE) in Siberia.
Article
Geology
Nikolay G. Zverkov, Mikhail A. Rogov, Viktor A. Zakharov, Igor G. Danilov, Dmitry Grigoriev, Martin Kostak
Summary: This study reports the first reptile remains found in the Upper Cretaceous marine strata of Siberia, including plesiosaurians, mosasaurids and turtles. These findings represent the northernmost occurrences of these reptile groups in the Cretaceous of Eurasia. The discovery of plesiosaurians suggests that the Arctic Polar Circle may have served as a birth and nursery area for these reptiles during the polar summer.
CRETACEOUS RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Oleg A. Lutikov
Summary: Diverse microfossil assemblages are found in the Lower Jurassic deposits on Svalbard, and macrofossils were previously known only from re-deposited phosphorite pebbles. This study describes a unique in situ molluscan assemblage dominated by ammonites in the lower Toarcian part of the Agardhbukta section. Ammonites belong to a new species and their findings characterize a new biohorizon.
NORWEGIAN JOURNAL OF GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Oleg A. Lutikov
Summary: This study described an in situ molluscan assemblage from the lower Toarcian deposits on Svalbard, which is dominated by ammonites and has fewer belemnites and bivalves. The distribution patterns of ammonites and bivalves suggest bilateral molluscan immigrations via the Greenland-Norwegian seaway during the late early Toarcian.
NORWEGIAN JOURNAL OF GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
N. M. M. Janssen, M. A. Rogov, V. A. Zakharov
Summary: This study describes the discovery of Ryazanian (Berriasian) macrofossils in the Central Graben and on the J AE ren High in the southern North Sea region. The macrofossils mainly consist of buchiid bivalves and ammonites, with the genus Lynnia recorded for the first time outside its typical area. The stratigraphic ranges of key ammonite genera are reconsidered, and the distribution differences of ammonites and bivalves are hypothesized to be the result of anoxic bottom water conditions in the southern Viking Strait.
NETHERLANDS JOURNAL OF GEOSCIENCES-GEOLOGIE EN MIJNBOUW
(2022)
Article
Geosciences, Multidisciplinary
Thomas Letulle, Guillaume Suan, Mathieu Daeron, Mikhail Rogov, Christophe Lecuyer, Arnauld Vincon-Laugier, Bruno Reynard, Gilles Montagnac, Oleg Lutikov, Jan Schlogl
Summary: Periods of high atmospheric CO2 levels in the past were associated with high polar temperatures and reduced latitudinal gradients. This study reconstructs marine temperatures during the Early Jurassic using isotope analysis of mollusc shells, showing that polar temperatures were 10-20 degrees Celsius higher than present, with reduced latitudinal gradients. These findings provide important constraints for modeling Jurassic temperatures and suggest that high climate sensitivity has been a hallmark of greenhouse climates for at least 180 million years.
CLIMATE OF THE PAST
(2022)
Article
Geosciences, Multidisciplinary
Mikhail Rogov, Victoria Ershova, Oleg Vereshchagin, Kseniia Vasileva, Kseniia Mikhailova, Aleksei Krylov
Summary: The database compiled from academic publications, explanatory notes, and reports includes over 700 occurrences of glendonites, showing their association with cold-water environments. While evidence suggests that glendonite occurrences are mainly restricted to cold-water settings, they do not occur consistently during every glaciation or cooling event of the Phanerozoic. Older occurrences have a patchy distribution, possibly indicating poor preservation potential of carbonate concretions and older sediments.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Geology
K. Yu Mikhailova, M. A. Rogov, V. B. Ershova, K. Yu Vasileva, B. G. Pokrovsky, E. Yu Baraboshkin
Summary: The Aptian deposits on Spitsbergen Island are poorly studied with limited data on fossil distribution. This article presents new ammonite-based biostratigraphy data from the Carolinefjellet Formation, verifying its age and the presence of lower Albian strata. Microscopic and isotope studies of glendonites from the middle Aptian of the Carolinefjellet Formation section revealed three calcite phases and isotopic compositions indicative of diagenetic fluids and sedimentary organic matter. Additionally, findings of ammonites clarified the stratigraphic intervals of glendonite occurrence and confirmed their early Albian age.
STRATIGRAPHY AND GEOLOGICAL CORRELATION
(2021)
