Article
Computer Science, Information Systems
Guanhao Hou, Xingguang Chen, Sibo Wang, Zhewei Wei
Summary: Personalized PageRank is widely used in search engines and social recommendations, but existing solutions are often inefficient for distributed settings. The Delta-Push framework aims to reduce rounds and communication load in distributed environments, utilizing a redesigned push algorithm and Monte-Carlo method to optimize PPR queries.
PROCEEDINGS OF THE VLDB ENDOWMENT
(2021)
Article
Computer Science, Interdisciplinary Applications
L. Orgogozo, T. Xavier, H. Oulbani, C. Grenier
Summary: A new solver for permafrost hydrology, developed within the framework of OpenFOAM, has been presented in this work. The solver has been tested for realistic field-based cases and its performance has been characterized up to 16000 cores on the IRENE supercomputer.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Sebastian F. Zastruzny, Thomas Ingeman-Nielsen, Wenxin Zhang, Bo Elberling
Summary: Erosion and infrastructure in the Arctic can alter the thickness of the active layer by changing the thermal-hydrological regime and drainage patterns. Field experiments and simulations show that adding or removing soil can affect the thickness of the saturated zone in the active layer, leading to changes in permafrost thawing and water movement. These findings have important implications for the Arctic ecosystem and local communities' living conditions.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jelte G. H. de Bruin, Victor F. Bense, Martine J. van der Ploeg
Summary: Comparison of numerical models with observed data revealed ranges of thermal properties in the active layer and significant differences in thickening rates under different error measures.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Biotechnology & Applied Microbiology
Caleb A. Lareau, Leif S. Ludwig, Christoph Muus, Satyen H. Gohil, Tongtong Zhao, Zachary Chiang, Karin Pelka, Jeffrey M. Verboon, Wendy Luo, Elena Christian, Daniel Rosebrock, Gad Getz, Genevieve M. Boland, Fei Chen, Jason D. Buenrostro, Nir Hacohen, Catherine J. Wu, Martin J. Aryee, Aviv Regev, Vijay G. Sankaran
Summary: This study combines ATAC-seq and mitochondrial DNA sequencing to reveal clonal variation in human cells and tissues. It enables the inference of clonal relationships, mtDNA heteroplasmy, and chromatin variability in individual cells, linking epigenomic variability to subclonal evolution and cellular dynamics in vivo. Overall, this approach allows for the study of cellular population dynamics and clonal properties in vivo.
NATURE BIOTECHNOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Tonghua Wu, Changwei Xie, Xiaofan Zhu, Jie Chen, Wu Wang, Ren Li, Amin Wen, Dong Wang, Peiqing Lou, Chengpeng Shang, Yune La, Xianhua Wei, Xin Ma, Yongping Qiao, Xiaodong Wu, Qiangqiang Pang, Guojie Hu
Summary: Relict permafrost is an ideal site to study the impacts of climate warming on ground thermal regimes, with long-term observations of meteorological and soil data at the Mahan Mountain site providing valuable insights. The high-quality datasets from this study can serve as accurate forcing data in land surface models and contribute to validating remote-sensing products for the geoscientific community.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Multidisciplinary Sciences
Kyungduk Kim, Stefan Bittner, Yongquan Zeng, Stefano Guazzotti, Ortwin Hess, Qi Jie Wang, Hui Cao
Summary: This study introduces a method for ultrafast generation of random bit streams using a single laser diode, achieving a total bit rate of 250 terabits per second with off-line postprocessing. The approach is robust, compact, energy-efficient, and has potential applications in secure communication and high-performance computation.
Article
Geosciences, Multidisciplinary
Egor Dyukarev, Nina Filippova, Dmitriy Karpov, Nikolay Shnyrev, Evgeny Zarov, Ilya Filippov, Nadezhda Voropay, Vitaly Avilov, Arseniy Artamonov, Elena Lapshina
Summary: This paper presents a hydrological and meteorological dataset collected at a peatland in Russia from 2010 to 2019, including variables such as air temperature, atmospheric pressure, and wind speed. The data provided can be used to examine the effects of meteorological conditions on local hydrological responses in cold regions.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Environmental Sciences
M. G. Cooper, T. Zhou, K. E. Bennett, W. R. Bolton, E. T. Coon, S. W. Fleming, J. C. Rowland, J. Schwenk
Summary: Permafrost, which covers approximately 20% of the global land area, has a significant impact on various aspects of the environment. Recent studies have shown that the thickness of the active layer above the permafrost has been increasing, leading to hydrological changes. By analyzing streamflow data, this study provides a theoretical framework for estimating changes in active layer water storage at a larger scale.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Piyoosh Jaysaval, Glenn E. Hammond, Timothy C. Johnson
Summary: Electrical resistivity tomography (ERT) is a widely used geophysical method for subsurface investigations. This study presents a robust and scalable implementation of forward modeling and inversion algorithms for ERT data, developed within the framework of the open-source code PFLOTRAN. The implementation shows good agreement with analytical solutions and exhibits almost linear scalability for forward modeling and superlinear scalability for Jacobian computation on high-performance computing resources.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2023)
Article
Engineering, Electrical & Electronic
Konstantinos Nikitopoulos
Summary: This article discusses the need for high throughput and ultra-massive device connectivity in 6G systems to support a variety of use cases. It highlights the potential benefits of moving from linear to nonlinear processing, but acknowledges the impracticality of traditional nonlinear processing in handling a large number of concurrently transmitted information streams. The article explores how efficiently massively parallelizing nonlinear processing can enable practical 6G systems with significantly improved capabilities, and examines the implications for future research and physical layer architectures.
IEEE COMMUNICATIONS MAGAZINE
(2022)
Article
Environmental Sciences
Bo-Quan Lu, Shu-Ying Zang, Li-Quan Song, Li Sun, Miao LI, Di Bing
Summary: Based on the observation of soil temperature and water content in two representative ecosystems in the Da Xing'anling Mountains in Northeast China from 2017 to 2020, this study explored the effects of climatic conditions and local factors on the freezing-thawing processes of active layer soils. The results showed delays in freezing and thawing start times in both ecosystems, and longer thawing time compared to freezing time in the active layer soil. These findings are important for understanding the formation and evolution of the active layer and permafrost in Xing'an permafrost regions and predicting ecosystem responses under climate change and permafrost degradation.
ADVANCES IN CLIMATE CHANGE RESEARCH
(2023)
Article
Environmental Sciences
Xingru Zhu, Xiyan Xu, Gensuo Jia
Summary: Wildfire has become a growing threat to the southern boreal forests and the permafrost beneath them, but continuous permafrost has contributed significantly to the expansion of wildfires across the entire Arctic region in the past two decades. While the burned area over continuous permafrost has been increasing at a rate of 0.9 Mha per decade, the trend over the entire permafrost areas has been decreasing (-0.5 Mha per decade). The expansion of wildfires is closely linked to a drier soil, as more than 90% of belowground fuel is combusted. Wildfires over continuous permafrost also result in severe degradation, with the active layer thickness tripling over a period of more than three decades.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Xiao Jiang, Hongyan Cai, Xiaohuan Yang
Summary: Northern high-latitude permafrost holds the largest soil carbon pool in the world, and understanding its responses to wildfires is crucial for predicting permafrost degradation and carbon emissions. This study used remotely sensed fire data and a random forest model to quantify the fire-induced changes in active layer thickness (ALT) and the contributions of vegetation and permafrost types. The results showed that ALT changes and sensitivity to burn severity increased with decreasing ground ice content in permafrost, and vegetation types had a higher contribution than permafrost types.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Computer Science, Hardware & Architecture
Mingyu Kim, Nakhoon Baek
Summary: This paper introduces a full 3D fixed-function graphics pipeline based on OpenCL, which enables 3D graphics features to be implemented in massively-parallel computing systems without dedicated hardware. The top-down rendering approach and tuning of OpenCL implementations in global and local parameter spaces ensure correctness and efficiency of the system.
JOURNAL OF SUPERCOMPUTING
(2021)
Article
Environmental Sciences
Sergey Yu Morgalev, Artem G. Lim, Tamara G. Morgaleva, Yuri N. Morgalev, Rinat M. Manasypov, Daria Kuzmina, Liudmila S. Shirokova, Laurent Orgogozo, Sergey Loiko, Oleg S. Pokrovsky
Summary: We experimentally simulated the freezing-thawing cycles in peat soils of permafrost landscapes and found that it could significantly alter the distribution of bacteria, dissolved organic carbon (DOC), nutrients, and trace elements in the peat core. The changes may be caused by the physical disintegration of peat particles, leaching of peat constituents, and opening of isolated pores during the freezing front migration. However, the presence of multiple concentration maxima after freeze-thaw events suggests that using the chemical composition of peat ice as an environmental archive for paleo-reconstructions is not reliable.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Soil Science
Daria M. Kuzmina, Artem G. Lim, Sergey V. Loiko, Nikita Shefer, Liudmila S. Shirokova, Frederic Julien, Jean-Luc Rols, Oleg S. Pokrovsky
Summary: Thawing of frozen soils in high latitude regions, especially permafrost peatlands, can release organic carbon, nutrients, and trace elements from pore ice, potentially impacting climate warming. The conventional method of evaluating labile soil components does not capture the native ice present in soil pores, leading to underestimation or overestimation of these components. This study analyzed direct pore ice samples from Siberia and compared them to water extraction methods. The results showed high concentrations of organic carbon, nutrients, carboxylic acids, and trace metals in the thawed and frozen layers, emphasizing the importance of considering dispersed ice in permafrost thaw scenarios.
Article
Environmental Sciences
Ivan V. Krickov, Artem G. Lim, Vladimir P. Shevchenko, Dina P. Starodymova, Olga M. Dara, Yuri Kolesnichenko, Dmitri O. Zinchenko, Sergey N. Vorobyev, Oleg S. Pokrovsky
Summary: Despite the lack of knowledge about the mineralogical control on major and trace element speciation in river suspended matter (RSM), this study examines the mineral and chemical composition of RSM in a boreal river in Western Siberia and its tributaries. The results show seasonal variations in RSM concentration and mineral phases, with quartz, albite, smectite, and chlorite increasing with discharge, and illite and calcite showing no effect from seasons or discharge. Elemental composition also varied seasonally, with sodium, K, Si, Al, trivalent, and tetravalent hydrolysates increasing with discharge, while alkaline-earth metals, P, Mn, and As decreased. The study highlights the importance of considering seasonal variations and understudied winter baseflow RSM sources.
Article
Geochemistry & Geophysics
Christian Grimm, Agnes Feurtet-Mazel, Oleg S. Pokrovsky, Eric H. Oelkers
Summary: Riverine particulates play a crucial role in transporting essential nutrients and affecting organic carbon burial in ocean margins. Microcosm experiments demonstrate the positive impact of riverine particulate material on diatom growth, as well as its role in organic carbon burial through aggregation and sedimentation of phytoplankton. The supply of riverine particulate material is highly sensitive to climate change and contributes significantly to regulating atmospheric CO2 concentrations.
Article
Chemistry, Physical
Mohamed Ahmed-Maloum, Thomas David, Laure Guetaz, Paul Duru, Joel Pauchet, Michel Quintard, Marc Prat
Summary: The effective diffusion properties of a gas diffusion layer composed of fibrous gas diffusion medium (GDM) and a microporous layer (MPL) were characterized using numerical simulations and advanced imaging techniques. The MPL's diffusion tensor was determined using reconstructed 3D images obtained from micro X-ray computed tomography and focused ion beam-scanning electron microscopy. The through-plane diffusion coefficient of the GDM-MPL assembly was computed considering the presence of MPL cracks and GDM fibers. The impact of MPL penetration into the GDM and GDM compressibility were also evaluated.
JOURNAL OF POWER SOURCES
(2023)
Article
Environmental Sciences
Rinat M. Manasypov, Artem G. Lim, Ivan V. Krickov, Tatiana V. Raudina, Danil G. Kurashev, Liudmila S. Shirokova, Oleg S. Pokrovsky
Summary: Thermokarst lakes in the Western Siberian Lowland play a significant role in controlling organic carbon and trace metal storage as well as greenhouse gas emissions. However, the knowledge about the colloidal forms of organic carbon (IC) and related elements in this region is limited. In this study, 38 thermokarst lakes were sampled and analyzed to quantify the relationships between the colloidal content of elements and factors such as lake surface area, permafrost coverage, pH, and concentrations of main colloidal constituents. The results showed positive correlations between lake area and the colloidal fractions of DOC, Ni, rare earth elements (REE), and Hf, as well as an increase in the colloidal fractions of certain elements from the permafrost-free zone to the permafrost-bearing zones.
Article
Chemistry, Multidisciplinary
Irina S. S. Ivanova, Liudmila S. S. Shirokova, Jean-Luc Rols, Oleg S. S. Pokrovsky
Summary: This study focuses on the development of a unified experimental protocol for studying the freezing and thawing of organic-rich natural waters under laboratory conditions. It aims to better understand the changes in solution chemical composition during ice formation and the behavior of dissolved organic carbon and trace elements in permafrost peatlands.
APPLIED SCIENCES-BASEL
(2023)
Article
Biochemistry & Molecular Biology
Nives Kovac, Jerome Viers, Jadran Faganeli, Oliver Bajt, Oleg S. Pokrovsky
Summary: Among the various exometabolitic effects of marine microorganisms, massive mucilage events in the coastal zones of temperate and tropical seas are the most spectacular and environmentally important. Abundant mucilage material in the form of aggregates appears in late spring/early summer in the water column of the Adriatic Sea. These macroaggregate biopolymers originate mainly from plankton exometabolites, with both autochthonous and allochthonous components, and strongly impact the tourism, fisheries, and economy of coastal countries.
Article
Geosciences, Multidisciplinary
Artem G. Lim, Oleg S. Pokrovsky, Sophie Cornu, Jean-Dominique Meunier
Summary: Despite the importance of silicon as a beneficial nutrient for plants, the reactivity of various silicon pools in soils is not fully understood, hindering the prediction of soil's capacity to provide soluble silicon for plant uptake. In this study, the release rate of silicon from French forest and agricultural topsoils was quantified. The rates were found to be weakly dependent on pH and varied among different soil groups. The pool of labile silicon in forest soils was also quantified and found to meet the annual requirements of plants.
Article
Environmental Sciences
Arisiya A. Byzaakay, Larisa G. Kolesnichenko, Iury Ia. Kolesnichenko, Aldynay O. Khovalyg, Tatyana V. Raudina, Anatoly S. Prokushkin, Inna V. Lushchaeva, Zoia N. Kvasnikova, Sergey N. Vorobyev, Oleg S. Pokrovsky, Sergey Kirpotin
Summary: This study investigates the carbon cycle in inland waters in Central Asian mountain regions, including carbon concentrations and CO2 emissions. The research reveals the significant impact of environmental factors on CO2 concentration and emissions.
Article
Environmental Sciences
Yves Auda, Erik J. Lundin, Jonas Gustafsson, Oleg S. Pokrovsky, Simon Cazaurang, Laurent Orgogozo
Summary: A land cover map of two arctic catchments near the Abisko Scientific Research Station was obtained using satellite images and ground surveys, providing important data for quantifying climate change impacts in the studied area.
Article
Environmental Sciences
Andrey Novoselov, Alexandr Konstantinov, Elizaveta Konstantinova, Yulia Simakova, Artem Lim, Alina Kurasova, Sergey Loiko, Oleg S. Pokrovsky
Summary: This study focuses on the inorganic carbon cycle in semiarid lakes of Central Eurasia, examining the hydrochemical variability and the formation of authigenic carbonate minerals in lake sediments. The pH and TDS of lake water are primarily controlled by the lithological and climatic context of the lake watershed. The study also identifies several common authigenic carbonates in lake sediments, such as calcite, aragonite, Mg-calcite, dolomite, and hydromagnesite. The findings of this study can be applied to a wider range of arid and semiarid lakes to understand the current state and potential modifications of the inorganic carbon cycle.
Article
Ecology
A. F. Osipov, V. V. Startsev, A. S. Prokushkin, A. A. Dymov
Summary: Soils are the largest reservoir of organic carbon in terrestrial ecosystems, but current estimates of soil organic carbon (SOC) vary widely. This study aimed to determine the influence of soil group and dominant tree species on mean SOC in forest ecosystems of the Krasnoyarsk Region. The results showed that different soil groups had a significant effect on SOC, while dominant tree species did not. These calculated values can be used as a basis for creating a SOC database for the forests of the Krasnoyarsk Region.
THEORETICAL AND APPLIED ECOLOGY
(2023)
Article
Engineering, Multidisciplinary
Farid Laouafa, Jianwei Guo, Michel Quintard
Summary: This study presents an approach to describe the dissolution process of evaporite rocks and its impact on geotechnical engineering. It explores the geological and engineering implications of the dissolution process and presents a method to model it. Although the method has a broad range of application, this study focuses on saline and gypsum rocks. The second part of the study analyzes the geotechnical consequences of gypsum dissolution, including its impact on soil dams, slopes, and pillars.
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
(2023)
Article
Geosciences, Multidisciplinary
Simon Cazaurang, Manuel Marcoux, Oleg S. Pokrovsky, Sergey V. Loiko, Artem G. Lim, Stephane Audry, Liudmila S. Shirokova, Laurent Orgogozo
Summary: This study numerically investigates the morphological and effective hydraulic properties of ground vegetation in the Western Siberian Lowland. The results show that the arctic cryptogamic cover can be considered an open and well-connected porous medium with good permeability. However, the digitally estimated hydraulic conductivity is higher than the results obtained from field and laboratory experiments, possibly due to compressibility effects during measurements.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
