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Theoretical insights into thermal transport and structural stability mechanisms of triaxial compressed methane hydrate

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Chinese Physics B 2024年第9期33卷 494-504页

作者： Dong-Sheng Chen Ting-Ting Miao Cheng Chang Xu-Yang Guo Meng-Yan Guan and Zhong-Li Ji Beijing Key Laboratory of Process Fluid Filtration and Separation College of Mechanical andTransportation EngineeringChina University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BeijingBeijing 102249China

The heat transfer and stability of methane hydrate in reservoirs have a direct impact on the drilling and production efficiency of hydrate resources,especially in complex stress environments caused by formation *** this study,we investigated the thermal transport and structural stability of methane hydrate under triaxial compression using molecular dynamics *** results suggest that the thermal conductivity of methane hydrate increases with increasing compression *** phonon transport mechanisms were identified as factors enhancing thermal *** low compressive strains,a low-frequency phonon transport channel was established due to the overlap of phonon vibration peaks between methane and water *** high compressive strains,the filling of larger phonon bandgaps facilitated the opening of more phonon transport ***,we found that a strain of􀀀0.04 is a watershed point,where methane hydrate transitions from stable to ***,a strain of􀀀0.06 marks the threshold at which the diffusion capacities of methane and water molecules are at their *** a higher strain of􀀀0.08,the increased volume compression reduces the available space,limiting the diffusion ability of water and methane molecules within the *** synergistic effect of the strong diffusion ability and high probability of collision between atoms increases the thermal conductivity of hydrates during the unstable period compared to the stable *** findings offer valuable theoretical insights into the thermal conductivity and stability of methane hydrates in reservoir stress environments.

关键词： methane hydrate molecular dynamics thermal transport triaxial compression structural stability

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The complexity of structural variations in Brassica rapa revealed by assembly of two complete T2T genomes

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Science Bulletin 2024年第15期69卷 2346-2351页

作者： Yifan Zhou Hanzhe Ye Enwei Liu Jingjing Tian Liping Song Zhiyong Ren Man Wang Zhenghui Sun Liguang Tang Zhongyue Ren Jinquan Li Qijun Nie Aihua Wang Kun Wang State Key Laboratory of Hybrid Rice Hubei Hongshan LaboratoryCollege of Life SciencesWuhan UniversityWuhan 430072China Wuhan Vegetable Research Institute Wuhan Academy of Agricultural SciencesWuhan 430045China Institute of Economic Crops Hubei Academy of Agricultural SciencesWuhan 430064China Institute for Advanced Studies Wuhan UniversityWuhan 430072China RNA Institute Wuhan UniversityWuhan 430072China

Brassica has long been of paramount importance to agriculture and human nutrition. Among the Brassica genus, Brassica rapa,the AA diploid, stands out as a prominent representative, valued for its versatility both as a vegetable and oil crop and its genetic proximity to other Brassica species. Economically, B. rapa plays an important role in the food industry, contributing to 12%of the global edible oil supply and 10%of vegetable yield [1].

关键词： structural proximity assembly

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Contribution of mechanical forces to structural synaptic plasticity:insights from 3D cellular motility mechanisms

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Neural Regeneration Research 2025年第7期20卷 1995-1996页

作者： Rita O.Teodoro Mafalda Ribeiro Ramos Lara Carvalho iNOVA4Health NOVA Medical School|Faculdade de Ciências MédicasNMS|FCMUniversidade Nova de LisboaLisboaPortugal

Cells,tissues,and organs are constantly subjected to the action of mechanical forces from the extracellular environment-and the nervous system is no ***-intrinsic properties such as membrane lipid composition,abundance of mechanosensors,and cytoskeletal dynamics make cells more or less likely to sense these *** and extrinsic cues are integrated by cells and this combined information determines the rate and dynamics of membrane protrusion growth or retraction(Yamada and Sixt,2019).Cell protrusions are extensions of the plasma membrane that play crucial roles in diverse contexts such as cell migration and neuronal synapse *** the nervous system,neurons are highly dynamic cells that can change the size and number of their pre-and postsynaptic elements(called synaptic boutons and dendritic spines,respectively),in response to changes in the levels of synaptic activity through a process called *** plasticity is a hallmark of the nervous system and is present throughout our lives,being required for functions like memory formation or the learning of new motor skills(Minegishi et al.,2023;Pillai and Franze,2024).

关键词： plasticity structural mechanisms

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Petrographic and structural Studies of the Guintéguéla Formations (Northwest of Côte d’Ivoire)

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Open Journal of Geology 2024年第1期14卷 29-49页

作者： Mohamed Samuel Moriah Conte N’guessan Nestor Houssou Oumar Barou Kaba Mohamed Lamine Timite Abdoulaye Kadiatou Diallo Aly Soumah Mohamed Camara Mohamed Fofana Djibril M’Mamy Camara Applied Research Laboratory Fundamental Geology and Prospecting Research Unit Emergent Centre Mines and Society Higher Institute of Mines and Geology of Boké Boké Republic of Guinea Laboratory of Geology and Energy Resources (LGRME) UFR of Earth Sciences and Mineral Resources University Felix Houphouet Boigny Abidjan Republic of Ivory Coast Applicated Research Laboratory Mining and Resource Development Research Unit Emergent Centre for Mines and Society Higher Institute of Mines and Geology of Boké Boké Republic of Guinea

Côte d’Ivoire is currently experiencing strong growth in the mining sector. Identifying the formations present in our subsoil is therefore essential for mining recovery. It is in this context that we conducted studies on the formations present in the locality of Guintéguéla. It is located in the northwest of Côte d’Ivoire in the bafing region. The aim of this work was to determine the petrographic and structural characteristics of the formations of the area. The methodology began with documentation and then followed petrography and structural analysis work on the macroscopic and microscopic levels. We observed six groups of rocks: granitoids, amphibolites, orthogneiss, quartzites (poor and rich in magnetites), volcano-sediments and filonian rocks. Metamorphism is of amphibolite to granulite facies. However, volcano-sediments must be associated with the green schist facies. With regard to the structural, structures and microstructures such as foliation;fractures;sigmoidal figures reveal that the studied area was affected by ductile and also brittle tectonics whose main directions are oriented along the shear corridor, so N-S to NNW-SSE.

关键词： Mining Petrography structural Metamorphism

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AChinese structural Biologist-Yan Ning

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初中生学习指导 2024年第23期 41-44页

作者：刘云江苏省盐城市新洋第二实验学校

本文介绍了生物学家颜宁回国发展的情况,以及她对未来进行的规划。

关键词： Yan structural Chinese

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Erratum to:Influence of structural defects on charge density waves in 1T-TaS_(2)

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Nano Research 2024年第3期17卷 2204-2204页

作者： Iaroslav Lutsyk Karol Szalowski Pawel Krukowski Pawel Dabrowski Maciej Rogala Witold Kozlowski Maxime Le Ster Michal Piskorski Dorota A.Kowalczyk Wojciech Rys Rafal Dunal Aleksandra Nadolska Klaudia Toczek Przemyslaw Przybysz Ewa Lacinska Johannes Binder Andrzej Wysmolek Natalia Olszowska Jacek J.Kolodziej Martin Gmitra Takuma Hattori Yuji Kuwahara Guang Bian Tai-Chang Chiang Pawel J.Kowalczyk Faculty of Physics and Applied Informatics University of LodzPomorska 149/15390-236 LodzPoland Faculty of Physics University of WarsawPasteura 502-093 WarsawPoland Faculty of Physics Astronomyand Applied Computer ScienceJagiellonian UniversityLojasiewicza 1130-348 KrakowPoland National Synchrotron Radiation Centre SOLARIS Jagiellonian UniversityCzerwone Maki 9830-392 KrakówPoland Institute of Physics Faculty of SciencePavol JozefŠafárik University in KošicePark Angelinum 904001 KošiceSlovakia Institute of Experimental Physics Slovak Academy of SciencesWatsonova 4704001 KošiceSlovakia Department of Precision Engineering Graduate School of EngineeringOsaka University2-1 Yamada-okaSuita 565-0871Japan Department of Physics and Astronomy University of MissouriColumbiaMissouri 65211USA Department of Physics and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-ChampaignUrbanaIllinois 61801-3080USA

The name of the second author in original paper was unfortunately *** should be“Karol Szalowski”,instead of“Karoli Szalowski”.

关键词： structural charge defects

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structural, electronic, and optical properties of ZnO_(1-x)Se_x alloys using first-principles calculations

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Chinese Physics B 2013年第8期22卷 581-588页

作者： Muhammad Rashid Fayyaz Hussain Muhammad Imran S A Ahmad N A Noor M U Sohaib S M Alay-e-Abbas Department of Physics Simulation Laboratory the Islamia University of Bahawalpur63100 Pakistan Department of Physics University of the Punjab Quaid-e-Azam Campus54590 Lahore Pakistan Lahore Development Authority 54590 Lahore Pakistan Department of Physics GC University FaisalabadAllama Iqbal Road Faisalabad 38000 Pakistan

The structural, electronic, and optical properties of binary ZnO, ZnSe compounds, and their ternary ZnOl_xSex alloys are computed using the accurate full potential linearized augmented plane wave plus local orbital （FP-LAPW ＋ lo） method in the rocksalt （B 1） and zincblende （B3） crystallographic phases. The electronic band structures, fundamental energy band gaps, and densities of states for ZnO1_xSex are evaluated in the range 0 〈 x 〈 1 using Wu-Cohen （WC） generalized gradient approximation （GGA） for the exchange-correlation potential. Our calculated results of lattice parameters and bulk modulus reveal a nonlinear variation for pseudo-binary and their ternary alloys in both phases and show a considerable deviation from Vegard＇s law. It is observed that the predicted lattice parameter and bulk modulus are in good agreement with the available experimental and theoretical data. We establish that the composition dependence of band gap is semi-metallic in B1 phase, while a direct band gap is observed in B3 phase. The calculated density of states is described by taking into account the contribution of Zn 3d, O 2p, and Se 4s, and the optical properties are studied in terms of dielectric functions, refractive index, reflectivity, and energy loss function for the B3 phase and are compared with the available experimental data.

关键词： density functional theory alloys structural electronic optical properties

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structural and magnetic properties of Sm_2Fe_(17-x)Nb_x (x = 0-4) alloys prepared by HDDR processes and their nitrides

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Rare Metals 2006年第2期25卷 129-137页

作者： SUN Jibing CUI Chunxiang ZHANG Ying LI lin GAO Jianxia LIU Yuling School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China Postdoctoral Programme School of Information Engineering Hebei University of Technology Tianjin 300130 China

Sm2Fe17-xNbx （x = 0-4） powder was synthesized by HDDR treatment and nitrogenation. The effects of partial Nb substitution for Fe on the structural and magnetic properties of Sm2Fe17-xNbx alloys and their nitlides were investigated. It was seen that Sm2（Fe,Nb）17 phase exists in both annealed and HDDR-treated Sm2Fe17-xNbx alloys. However, its content is decreased with the increase in Nb substitution. In annealed alloys, Sm2（Fe,Nb）17 phase becomes unstable and will dissociate into SmFe2 and Fe-rich phases when x 〉 1.5. With HDDR-treatment, the Nb concentration in recombined Sm2（Fe,Nb）17 phase is decreased, and the content of Fe-rich phases is increased. Sm2Fe17-xNbx powder exhibits dendritic cracks and fine particles with a size of less than 300 nm. In nitrogenated alloys, N atoms mainly enter 2：17-type phase to form Sm2（Fe,Nb）17Ny. Partial Nb atoms in Sm2（Fe,Nb）17Ny phase will be released or excluded by nitrogen atoms. Fe-rich phases increase, and are followed by the amorphous Sm2（Fe,Nb）17Ny phase. Nb substitution for Fe with x = 0.5 and 1.0 in Sm2Fe17-xNbxNy powders increases the coercivity and remanence. But when x is greater than 2.0, Nb substitution will deteriorate the magnetic properties.

关键词： magnetic materials Sm-Fe-Nb-N alloys HDDR structural magnetic properties

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structural reliability analysis using a hybrid HDMR-ANN method

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Journal of Central South University 2017年第11期24卷 2532-2541页

作者： Bhaw Nath Jha LI Hong-shuang Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicles Nanjing University of Aeronautics and AstronauticsNanjing 210016China

A new hybrid method is proposed to estimate the failure probability of a structure subject to random parameters. The high dimensional model representation(HDMR) combined with artificial neural network(ANN) is used to approximate implicit limit state functions in structural reliability analysis. HDMR facilitates the lower dimensional approximation of the original limit states function. For evaluating the failure probability, a first-order HDMR approximation is constructed by deploying sampling points along each random variable axis and hence obtaining the structural responses. To reduce the computational effort of the evaluation of limit state function, an ANN surrogate is trained based on the sampling points from HDMR. The component of the approximated function in HDMR can be regarded as the input of the ANN and the response of limit state function can be regarded as the target for training an ANN surrogate. This trained ANN surrogate is used to obtain structural outputs instead of directly calling the numerical model of a structure. After generating the ANN surrogate, Monte Carlo simulation(MCS) is performed to obtain the failure probability, based on the trained ANN surrogate. Three numerical examples are used to illustrate the accuracy and efficiency of the proposed method.

关键词： high dimensional model representation structural reliability artificial neural network failure probability

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structural response of aluminum core–shell particles in detonation environment

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Chinese Physics B 2019年第8期28卷 387-392页

作者： Qing-Jie Jiao Qiu-Shi Wang Jian-Xin Nie Hong-Bo Pei State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China China Academy of Engineering Physics Institute of Fluid PhysicsMianyang 621900China

Natural aluminum particles have the core-shell *** structure response refers to the mechanical behavior of the aluminum particle structure caused by external *** dynamic behavior of the structural response of aluminum core-shell particles before combustion is of great importance for the aluminum powder burning mechanism and its *** this paper,an aluminum particle combustion experiment in a detonation environment is conducted and analyzed;the breakage factors of aluminum particles shell in detonation environment are *** experiment results show that the aluminum particle burns in a gaseous state and condenses into a sub-micron particle *** calculation and simulation demonstrate that the rupture of aluminum particle shell in the detonation environment is mainly caused by the impact of the detonation *** detonation wave impacts the aluminum particles,resulting in shell cracking,and due to the shrinkage-expansion of the aluminum core and stripping of the detonation product,the cracked shell is fractured and peeled with the aluminum reacting with the detonation product.

关键词： aluminum core-shell particles structural response aluminum combustion aluminized explosives

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