Article
Engineering, Multidisciplinary
Hongmei Kang, Wenkai Hu, Zhiguo Yong, Xin Li
Summary: This paper introduces a modified version of Loop subdivision called MLSS to improve convergence rates in isogeometric analysis. MLSS is parameterized on non-boundary elements and does not require special subdivision rules and evaluation for the boundaries. The paper combines the idea of the control net of B-splines and Nitsche's method to solve the non-optimal convergence rate problem. It defines a new rule for extraordinary points and achieves optimal convergence rate in numerical experiments for the Poisson problem.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Thermodynamics
Yisheng Cao, Gang Liu, Donghua Luo, Durga Prasad Bavirisetti, Gang Xiao
Summary: With the integration of more photovoltaic (PV) systems into the grid, accurately forecasting PV power output at various time scales becomes urgent. This paper proposes an improved Stacking ensemble algorithm combined with LSTM and Informer models (ISt-LSTM-Informer) to achieve accurate short and medium-term PV power forecasting. Experimental results using a historical dataset from a PV system in Uluru, Australia, validate the superiority and effectiveness of the proposed model.
Article
Computer Science, Software Engineering
Kestutis Karciauskas, Jorg Peters
Summary: This article discusses the problem of filling multi-sided holes and introduces a new algorithm to improve surface shape. The new algorithm addresses the issues of the old algorithms and emphasizes the balance between smoothness and good shape.
COMPUTER-AIDED DESIGN
(2023)
Article
Mathematics
Samsul Ariffin Abdul Karim, Faheem Khan, Ghulam Mustafa, Aamir Shahzad, Muhammad Asghar
Summary: Subdivision schemes use rules to transform polygons into smooth curves or surfaces. Determining the number of iterations needed to achieve the desired shape with a user-specified error tolerance is a challenge. This paper presents a new approach based on convolution to estimate error bounds and subdivision depth for non-stationary schemes.
Article
Engineering, Geological
Xiaoxiong Zhou, Qiuming Gong, Xiaoli Liu, Hongyi Xu, Lijun Yin
Summary: In this study, a GPU-based DICE2D program was used to simulate the relationship between rock chip properties and rock mass conditions in TBM tunnelling. The results showed that joint spacing and alpha angle both affected the rock breaking process and rock chip properties. Furthermore, a rock chip extraction algorithm was proposed to measure shape and size distribution.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Chenyun Pan, Hongtao Fan, Ruixiang Zhang, Jie Sun, Yu Wang, Yaojie Sun
Summary: In this paper, an improved multi-timescale coordinated control strategy is proposed for an integrated energy system (IES) with a hybrid energy storage system (HESS) to address the complex energy coupling and fluctuation of renewable energy sources. The power response characteristics of various devices in IES at different time scales are analyzed, demonstrating the effectiveness of the multi-timescale coordinated control method in coupling with the IES. The advantages of HESS in stabilizing power fluctuation and extending energy storage life are compared, and a control method for supercapacitor under multi-timescale coordinated control strategy is proposed.
Article
Energy & Fuels
Qinkuan Hou, Shuhong Wang, Rui Yong, Zhanguo Xiu, Wenshuai Han, Ze Zhang
Summary: This study proposes an improved netting algorithm to identify discontinuity sets based on multiple discontinuity properties. A novel weighting method is used to weigh each property and combines the advantages of subjective and objective weighting methods. The method can effectively filter the noise data and achieve global optimization without the need for initial clustering centers and group numbers.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Engineering, Multidisciplinary
Qiming Kong, Zhenhua Wu, Yuantao Song
Summary: This paper studies a defect detection algorithm designed based on an improved template matching algorithm for bolt surface defect detection. It solves the problem of difficult template matching for bolted images during online inspection and has a significant speedup.
Article
Chemistry, Physical
Tatsuhito Matsuo
Summary: Thermal fluctuations of proteins at the ps-ns timescales are important for their functions and have extensively been studied. The QENS spectra of proteins are generally analyzed in terms of immobile and mobile fractions of atoms. An improved analytical model using QENS is proposed to deconvolute the mobile fraction of atoms into atoms with high and low mobility. The presented model provides useful information to understand the molecular mechanism of protein functions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Computer Science, Software Engineering
Kestutis Karciauskas, Jorg Peters
Summary: Multi-sided faces can arise in polyhedral modeling when introducing features that do not align with the regular grid structure. By splitting the n-gon into n quadrilaterals and connecting them at the n-gon's centroid, the shape of the surfaces can be improved. A new alternative face (and edge) rule shows noticeable improvement in the shape of surfaces controlled by the refined mesh.
COMPUTERS & GRAPHICS-UK
(2022)
Article
Engineering, Electrical & Electronic
Yuyang Huang, Peng Xiao, Bin Liao
Summary: This paper proposes an effective preprocessing approach to address the source cross-correlation problem in blind source separation, achieving competitive efficiency, robustness, and accuracy in comparison to existing methods.
DIGITAL SIGNAL PROCESSING
(2021)
Article
Thermodynamics
Shangshang Wei, Xianhua Gao, Yi Zhang, Yiguo Li, Jiong Shen, Zuyi Li
Summary: This study introduces a single-layer multi-timescale framework for coordinating operation performance at different timescales, incorporated into an improved SMPC strategy. Results from simulation evaluations demonstrate that the improved strategy achieves the best tradeoff performance in terms of economy, robustness, and computational efficiency.
Article
Environmental Sciences
Fhatuwani Sengani, Francois Mulenga
Summary: The study focused on rockfall stability analysis and developing an improved rockfall hazard matrix chart. Structural mapping and RocFall software were used to identify parameters influencing rockfall occurrence and monitor kinetic energy variations. The presence of joints and bedding planes weakened the rock mass along R518 road, leading to potential rockfall. Simulations with RocFall highlighted the impact of slope height, vegetation density, slope angle, and rock velocity on the extent of rock fragmentation reach. An improved rockfall hazard rating chart was proposed based on empirical and numerical findings for assessing rockfall hazard levels along highways and roads.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Mechanical
Rahim Habibi
Summary: Rock salt's good deformability is one of its most important properties, which can neutralize stress and heal damage. Stability is a crucial requirement in salt cavern design and construction. This paper investigated various stability criteria and found that the criterion proposed by De Vries et al. is the most suitable approach for stability analysis. However, it does not consider the effects of stress path and history. To address this, an updatable dilatancy criterion is proposed which takes into account the stress path and history and gives deeper insight into the strength of rock salt.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Engineering, Mechanical
Lihai Tan, Ting Ren, Linming Dou, Xiaohan Yang, Xin Cai, Ming Qiao
Summary: The study demonstrates that the accuracy of stress solution for plates containing holes with corners is improved by optimizing the Schwarz alternating method without inverse mapping function. Through simulation experiments, it was found that hoop stress linearly relates to lateral pressure coefficient and fractures tend to initiate around boundaries where stress concentrates.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Multidisciplinary Sciences
Xunlai Yuan, Ke Pang, Qing Tang, Guangjin Li, Shuhai Xiao, Chuanming Zhou, Zhe Chen, Lei Chen, Bin Wan, Wei Wang, Chengguo Guan, Qing Ouyang, Changtai Niu, Xiaopeng Wang, Yarong Liu
Summary: Complex multicellular eukaryotic organisms have dominated the Earth since the Precambrian-Cambrian transition, but the timing and dynamics of the evolutionary transitions from unicellular ancestors to complex organisms remain largely unclear. Recent advances in paleontology and molecular clock analysis suggest that complex organisms have deep roots in the "Boring Billion" period. This period, characterized by apparent environmental quiescence and evolutionary stasis, may have provided the conditions for the divergence of single-celled ancestors into major groups of complex organisms.
CHINESE SCIENCE BULLETIN-CHINESE
(2023)
Article
Biology
Kelly E. E. Tingle, Susannah M. M. Porter, Morgan R. R. Raven, Andrew D. D. Czaja, Samuel M. M. Webb, Bonnie Bloeser
Summary: This study aims to verify whether VSM microfossils from the Chuar Group contain original organic material. It is found that VSM test walls contain carbon, iron, and sulfur, while silica is present in the surrounding matrix. Optical microscopy and scanning electron microscopy analysis confirm that the Walcott VSM test walls are organic and sometimes secondarily pyritized. Based on this evidence, it is concluded that VSM microfossils can preserve original organic test material.
Article
Biology
Noah J. Planavsky, Dan Asael, Alan D. Rooney, Leslie J. Robbins, Benjamin C. Gill, Carol M. Dehler, Devon B. Cole, Susannah M. Porter, Gordon D. Love, Kurt O. Konhauser, Christopher T. Reinhard
Summary: Phosphorus (P) is considered to be the ultimate limiting nutrient in the Earth's biosphere. Sedimentary enrichment of P can provide insights into the changes in marine P cycling. An analysis of an updated P compilation suggests a significant transition in P cycling occurred earlier than previously suggested, potentially divorcing climatic changes from the Neoproterozoic era to changes in the Earth's P cycle. This transition is associated with less reducing marine conditions, higher marine P concentrations, and an increase in eukaryotic organisms.
Article
Geochemistry & Geophysics
Liang Gao, Yue Zhao, Zhenyu Yang, Junling Pei, Shuan-Hong Zhang, Xiaochun Liu, Yabo Tong, Jian-Min Liu, Joaquin Bastias
Summary: Plate reconstructions of the Antarctic Peninsula show its rotation and spatio-temporal history of magmatism since 90 Ma, using a combination of paleomagnetic data and geological evidence. It is found that the convergence variation between the Phoenix Plate and Antarctic Peninsula, as well as the back-arc extension of the Scotia Plate, correlate with five different plate rotation periods. The initiation of the South Sandwich subduction zone and the separation between the Antarctic Peninsula and South America can be explained by clockwise rotation of the Antarctic Peninsula starting at around 80 and 62 Ma, respectively.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Paleontology
Katie M. Maloney, Dakota P. Maverick, James D. Schiffbauer, Galen P. Halverson, Shuhai Xiao, Marc Laflamme
Summary: The preservation of Proterozoic eukaryotic macroalgae is challenging due to the lack of necessary morphological details. Two additional forms have unidentified affinities, but the presence of three unique algal forms supports previous reports of increased algal diversity in the early Neoproterozoic.
JOURNAL OF PALEONTOLOGY
(2023)
Article
Multidisciplinary Sciences
Huyue Song, Zhihui An, Qin Ye, Eva E. Stueken, Jing Li, Jun Hu, Thomas J. Algeo, Li Tian, Daoliang Chu, Haijun Song, Shuhai Xiao, Jinnan Tong
Summary: Based on geochemical and paleontological data, this study reveals that habitable open-oceans extended to mid-latitude coastal oceans during the waning stage of the Marinoan snowball Earth, providing refugia for benthic photosynthetic eukaryotes.
NATURE COMMUNICATIONS
(2023)
Editorial Material
Multidisciplinary Sciences
Ariel D. Anbar, Roger Buick, Gwyneth W. Gordon, Aleisha C. Johnson, Brian Kendall, Timothy W. Lyons, Chadlin M. Ostrander, Noah J. Planavsky, Christopher T. Reinhard, Eva E. Stueken
Summary: Slotznick et al. argue that the analysis of paleoredox proxies in the Mount McRae Shale, Western Australia, was misunderstood, suggesting that environmental oxygen levels were consistently negligible before the GOE. However, we find these arguments to be logically flawed and factually incomplete.
Article
Astronomy & Astrophysics
Shuan-Hong Zhang, Mei-Fu Zhou, Yue Zhao, Qi-Qi Zhang, Guo-Hui Hu, Ling-Hao Kong, Sen Wang, Jun-Ling Pei, Daniel P. Miggins
Summary: Through our study of the western part of the North China Craton, we found that the formation of the Bayan Obo deposit occurred during the late Paleozoic when there was an unusually high temperature in the upper crust. This high temperature resulted in extensive thermal perturbations and recrystallization of REE-bearing minerals, as well as the resetting of isotopic clocks. These findings are important for understanding the genesis and timing of the Bayan Obo deposit.
EARTH AND SPACE SCIENCE
(2023)
Article
Geochemistry & Geophysics
B. B. Kochnev, B. G. Pokrovsky, A. B. Kuznetsov
Summary: Studies were conducted on the carbon and strontium isotope composition of carbonate sediments from the Khorbusuonka group and Kessyusa formation in northeastern Siberia. The results showed that the maximum δ13C values of carbonate rocks from the Turkut and Kessyusa formations in the Khastakhskaya-930 borehole were +7.0...+7.4 ‰, while the lowest 87Sr/86Sr ratio was 0.7079. These isotope-geochemical characteristics suggest that these formations may be younger (Tommotian) or older (early Vendian) than previously thought, and provide alternative possibilities for their regional correlation with the Burskaya-341-0 borehole and Olenek uplift sections. The higher sediment deposition intensity during this period compared to adjacent regions may indicate rift-related extension settings.
GEODYNAMICS & TECTONOPHYSICS
(2023)
Article
Geochemistry & Geophysics
Axel Hofmann, Robert Bolhar, Anton B. Kuznetsov, Jaganmoy Jodder, Mike Butler, Ai Nguyen
Summary: The Neoarchaean greenstone belts in Zimbabwe contain limestone successions with microbial fossils, ranging in age from -2.82 to 2.68 Ga. Among these, the best-preserved successions are found in the Bulawayo and Belingwe greenstone belts, which were subjected to lower greenschist facies metamorphism. The carbonate rocks mainly consist of calcite, with some dolomite and variable amounts of siliciclastic detritus.
Article
Geosciences, Multidisciplinary
S. K. Baltybaev, N. G. Rizvanova, A. B. Kuznetsov, M. E. Petrakova, E. S. Vivdich
Summary: The Tervu breccia zone and granitic agmatites have a sublatitudinal orientation and are discordant to the earlier structures in the Ladoga region. The U-Pb ages of the monazites from the Tervu and Peltola intrusions indicate simultaneous intrusion of the granites during the late-orogenic stage, revealing the tectonic development of the junction zone between the Karelian Craton and the Svecofennian Belt in the Fennoscandinavian shield.
DOKLADY EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
A. B. Vrevsky, A. B. Kuznetsov, P. A. Lvov
Summary: The U-Th-Pb age of magmatic zircon from metavolcanics in the Kaskama block of the Inari terrane was determined for the first time, placing them in the Paleoproterozoic Kalevian suprahorizon. The source of these metavolcanics was the Paleoproterozoic continental lithosphere with some contributions from juvenile material. The ages of related tonalites and granitoid massifs in the region predate the volcanosedimentary deposits, indicating different geodynamic stages in the Fennoscandian Shield.
DOKLADY EARTH SCIENCES
(2023)
Article
Biology
C. R. Woltz, R. P. Anderson, N. J. Tosca, S. M. Porter
Summary: The preservation of Precambrian organic-walled microfossils (OWMs) is primarily controlled by clay mineralogy and total organic carbon (TOC). Total clay concentration positively correlates with well-preserved microfossils, while TOC concentration negatively correlates with their preservation. However, TOC does not moderate the effect of clay mineral concentrations on OWM preservation, indicating independent roles of both factors. Shales with high illite concentrations and low berthierine/chamosite concentrations are more likely to have well-preserved microfossils.
Article
Multidisciplinary Sciences
Katherine Mateos, Garrett Chappell, Aya Klos, Bryan Le, Joanne Boden, Eva Stueken, Rika Anderson
Summary: The biogeochemical sulfur cycle plays a central role in microbial metabolisms, Earth's redox state regulation, and climate effects. Geochemical reconstructions of the ancient sulfur cycle are complicated due to ambiguous isotopic signals. By using phylogenetic reconciliation, we determined the timing of ancient sulfur cycling gene events across the tree of life. Our findings suggest the early emergence of sulfide oxidation metabolisms in the Archean, while thiosulfate-based metabolisms emerged after the Great Oxidation Event. These results highlight the contribution of genomic innovation to the observed geochemical signatures and reveal the existence of organic sulfur cycling since the Mid-Proterozoic, with implications for climate regulation and atmospheric biosignatures. Overall, our study provides insights into the co-evolution of biological sulfur cycle and early Earth's redox state.
Article
Chemistry, Multidisciplinary
Eva E. Stueken, Sebastian Viehmann, Simon V. Hohl
Summary: This study investigates the reliability of proxies for marine and nonmarine environments by analyzing sulfur and nitrogen isotopes and sulfur/carbon ratios in the Miocene Oberpullendorf Basin. The results show that the residence time of isotopes in seawater affects the accuracy of proxies, with nitrogen isotopes being more sensitive than sulfur isotopes. This highlights the importance of considering residence time when using geochemical proxies.
ACS EARTH AND SPACE CHEMISTRY
(2023)
