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APPLICATION OF PARAMETRIC DERIVATION METHOD TO THE CALCULATION OF PEIERLS ENERGY AND PEIERLS STRESS IN LATTICE THEORY

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Acta Mechanica Solida Sinica 2007年第4期20卷 363-368页

作者： xiaozhi wu Shaofeng Wang Institute for Structure and Function Chongqing University Chongqing 400044 China

Applying the parametric derivation method, Peierls energy and Peierls stress are calculated with a non-sinusoidal force law in the lattice theory, while the results obtained by the power-series expansion according to sinusoidal law can be deduced as a limiting case of non- sinusoidal law. The simplified expressions of Peierls energy and Peierls stress are obtained for the limit of wide and narrow. Peierls energy and Peierls stress decrease monotonically with the factor of modification of force law. Present results can be used expediently for prediction of the correct order of magnitude of Peierls stress for materials.

关键词： Peierls energy Peierls stress parametric derivation method lattice theory

EXTENDED CORE STRUCTURE OF DISSOCIATED EDGE DISLOCATIONS IN FCC CRYSTALS WITH CONSIDERATION OF DISCRETENESS

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Acta Mechanica Solida Sinica 2008年第5期21卷 403-410页

作者： xiaozhi wu Shaofeng Wang Huili Zhang Institute for Structure and Function Chongqing University Chongqing 400044 China

The extended core structure of the dissociated edge dislocation in Al, Au, Ag, Cu and Ni is determined within lattice theory of dislocation. The 2D dislocation equation governing the displacements is coupled by the restoring forces that are determined by the parameterization of the generalized stacking fault energies. The Ritz variational method is presented to solve the dislocation equation and the trial solution is constituted by two arctan-type functions with two undetermined parameters. The core widths of partial dislocations are wider than that obtained in generalized Peierls-Nabarro model due to the consideration of discreteness of crystal.

关键词： core structure dissociation dislocation equation variational method

ON CORE STRUCTURE PROPERTIES AND PEIERLS STRESS OF DISSOCIATED SUPERDISLOCATIONS IN ALUMINIDES:NiAl AND FeAl

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Acta Mechanica Solida Sinica 2010年第3期23卷 213-219页

作者： xiaozhi wu Shaofeng Wang Congbo Li Institute .for Structure and Function Chongqing University Chongqing 400044 China State Key Laboratory of Mechanical Transmission Chongqing University Chongqing 400044 China

The study of dislocation properties in B2 structure intermetallics NiAl and FeAl is crucial to understand their mechanical behaviors. In this paper, the core structure and Peierls stress of collinear dissociated （111）{110} edge superdislocations in NiAl and FeAl are investigated with the modified P-N dislocation equation. The generalized stacking fault energy curve along （111） direction in {110} slip plane contains two modification factors that can assure the antiphase energy and the unstable stacking fault energy to change independently. The results show that the core width of superpartials decreases with the increasing unstable stacking fault energy, and increases with the increasing antiphase boundary energy. The calculated Peierls stress of （111）{ 110） edge superdislocations in NiAl and FeAl are 475 MPa and 3042 MPa, respectively. The values of Peierls stress in NiAl is in accordance in magnitude with the experimental and the molecular statics simulations results.

关键词： core structure Peierls stress NiAl FeAl

Characteristics of Volcanic Reservoirs and Hydrocarbon Accumulation of Carboniferous System in Junggar Basin, China

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Journal of Earth Science 2021年第4期32卷 972-985页

作者： xiaozhi wu Qiulin Guo Wei Zhang Dengfa He Xuefeng Qi Di Li Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China School of Earth and Space Sciences Peking UniversityBeijing 100871China School of Energy Resources China University of GeosciencesBeijing 100083China

The Carboniferous volcanic reservoirs in Junggar Basin contain rich hydrocarbon resources,implying a great exploration potential,so that they have become a key replacement target for“three-dimensional exploration”.The study on the Carboniferous volcanic reservoirs and their hydrocarbon accumulation elements is significant for clarifying the orientation for *** this paper,based on 37 reserves reports and 3200 reservoir test data,the Carboniferous volcanic reservoirs in Junggar Basin were discussed from the prospective of lithology and lithofacies,physical properties,reservoir types,main controls on hydrocarbon accumulation,and hydrocarbon accumulation *** is found that the Carboniferous in the basin is mostly in the multi-island ocean-volcanic island arc structural-sedimentary environment,so it is geologically eligible for forming in-situ volcanic *** volcanic rocks are:(1)mostly distributed along deep and large faults,with the lithology and lithofacies controlled by volcanic architectures;(2)dominantly lava,followed by volcaniclastic lava and volcaniclastic rock;(3)distributed in the periphery of hydrocarbon-generating sag and within the source rocks horizontally,and concentrated in the weathering crust at the top longitudinally,possibly leading to reworked weathering crust reservoir;and(4)liable to form inner *** volcanic reservoirs can be concluded into four hydrocarbon accumulation patterns,i.e.,self-generating&self-storing in paleo-uplift and vertical migration,self-generating&self-storing in paleo-uplift and lateral migration,young-generating&old-storing in fault zone and vertical migration,and young-generating&old-storing in paleo-uplift and lateral *** exploration will focus on the effective source rock development and hydrocarbon supply zones and the selfgenerating&self-storing and young-generating&old-storing *** exploration prospects are determined to be the Ludong-wucaiwan-Baijiahai slope belt

关键词： Carboniferous volcanic reservoir volcanic rock reservoir characteristic hydrocarbon accumulation lithology and lithofacies Junggar Basin

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Basic Types and Structural Characteristics of Uplifts:An Overview of Sedimentary Basins in China

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Acta Geologica Sinica(English Edition) 2009年第2期83卷 321-346页

作者： HE Dengfa LI Desheng wu xiaozhi WEN Zhu School of Energy Resources China University ofGeosciences Beijing 100083 China Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism Ministry of Education China University of Geosciences Beijing 100083 China PetroChina Research Institute of Exploration and Development Beijing 100083 China

The uplift is a positive structural unit of the crust. It is an important window for continental dynamics owing to its abundant structural phenomena, such as fault, fold, unconformity and denudation of strata. Meanwhile, it is the very place to store important minerals like oil, natural gas, coal and uranium. Giant and large-scale oil and gas fields in China, such as the Daqing Oilfield, Lunnan-Tahe Oilfield, Penglai 19-3 Oilfield, Puguang Gas Field and Jingbian Gas Field, are developed mainly on uplifts. Therefore, it is the main target both for oil and gas exploration and for geological study. The uplift can be either a basement uplift, or one developed only in the sedimentary cover. Extension, compression and wrench or their combined forces may give rise to uplifts. The development process of uplifting, such as formation, development, dwindling and destruction, can be taken as the uplifting cycle. The uplifts on the giant Precambrian cratons are large in scale with less extensive structural deformation. The uplifts on the medium- and small-sized cratons or neo-cratons are formed in various shapes with strong structural deformation and complicated geological structure. Owing to changes in the geodynamic environment, uplift experiences a multi-stage or multi-cycle development process. Its geological structure is characterized in superposition of multi-structural layers. Based on the basement properties, mechanical stratigraphy and development sequence, uplifts can be divided into three basic types-the succession, superposition and destruction ones. The succession type is subdivided into the maintaining type and the lasting type. The superposition type can be subdivided into the composite anticlinal type, the buried-hill draped type, the faulted uplift type and the migration type according to the different scales and superimposed styles of uplifts in different cycles. The destruction type is subdivided into the tilting type and the negative inverted type. The develo

关键词： uplift geological structure structural type continental dynamics oil and gasaccumulation sedimentary basin China

New advances in the assessment of tight oil resource in China

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Petroleum Research 2017年第1期2卷 1-12页

作者： Shejiao Wang Yuanjiang Yu Qiulin Guo Shaoyong Wang xiaozhi wu PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China

The research on tight oil becomes another hotspot in the field of unconventional oil and gas after the boom of shale *** global recoverable resources of tight oil are estimated to be around 47.3×10^(9)*** recent years,significant progress has been made in the technologies of tight oil exploration and development in North America,thus stimulating the dramatic increase of tight oil ***,China has also acquired remarkable achievements in tight oil *** assessment methods have been established for tight oil resources by the US,generally dominated by analogy and statistical methods with their own advantages and disadvantages as well as applicable *** China,improvement of resource evaluation techniques becomes an urgent issue in increasing tight oil reserve and *** study mainly discusses the resource evaluation methods and resource enrichment characteristics of tight *** kinds of assessment methods in three categories(i.e.,analogy,statistical and genetic method)and evaluation parameters have been preliminary established,and are specifically applied in the Sichuan,Ordos,Songliao,Junggar,Bohai Bay and other tight oil basins through the newly hierarchical resource abundance analogy method,the estimated ultimate recovery(EUR)analogy method and the small-cell volumetric *** preliminary evaluation results reveal that China has great potential in tight oil resource,and the geological resources amount to 20×10^(9)t,providing a resource base for large-scale development.

关键词： Unconventional oil and gas Resource assessment method Resource potential Resource enrichment characteristics Tight oil

Combined effect of pre-aging and Ag/Cu addition on the natural aging and bake hardening in Al-Mg-Si alloys

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Progress in Natural Science:Materials International 2018年第3期28卷 363-370页

作者： Yaoyao Weng Zhihong Jia Lipeng Ding Manping Liu xiaozhi wu Qing Liu College of Materials Science and Engineering Chongqing University School of Materials Science and Engineering Jiangsu Province Key Laboratory of Materials TribologyJiangsu University College of Physics Chongqing University

The combined effect of pre-aging and Ag/Cu addition on natural aging and bake hardening in Al-Mg-Si alloys were studied by Vickers microhardness measurement, tensile test, atom probe tomography and transmission electron microscopy. The results showed that Ag and/or Cu addition could further enhance the positive effect of pre-aging on bake hardening for Al-Mg-Si alloys. Although the pre-aged alloys with individual Ag/Cu addition had higher paint bake hardness, the hardness in T4 P temper was relatively high due to effectively forming of Cluster(2) during pre-aging. While the pre-aged Ag-Cu-added alloy had low T4 P temper hardness and higher bake hardening response. The strong interaction energies between Ag/Cu atoms and Mg atoms were responsible for the facilitated clustering and precipitation processes. After paint bake treatment, most of Ag atoms accumulated preferentially at β″/α-Al matrix interface, while Cu atoms entered into the interior of β″resulting in disordered structure within the precipitate.

关键词： Al-Mg-Si alloys Ag addition Cu addition Pre-aging Atomic-resolution electron microscopy

Half-metallic ferromagneticWeyl fermions related to dynamic correlations in the zinc-blende compound VAs

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Chinese Physics B 2024年第9期33卷 528-533页

作者： Xianyong Ding Haoran Wei Ruixiang Zhu Xiaoliang Xiao xiaozhi wu Rui Wang Institute for Structure and Function&Department of Physics&Chongqing Key Laboratory forStrongly Coupled Physics Chongqing UniversityChongqing 400044China Center of Quantum Materials and Devices Chongqing UniversityChongqing 400044China

The realization of 100%polarized topologicalWeyl fermions in half-metallic ferromagnets is of particular importance for fundamental research and spintronic ***,we theoretically investigate the electronic and topological properties of the zinc-blende compound VAs,which was deemed as a half-metallic ferromagnet related to dynamic *** on the combination of density functional theory and dynamical mean field theory,we uncover that the half-metallic ferromagnet VAs exhibits attractive Weyl semimetallic behaviors which are very close to the Fermi level in the DFT+U regime with effect U values ranging from 1.5 eV to 2.5 ***,we also investigate the magnetization-dependent topological properties;the results show that the change of magnetization directions only slightly affects the positions of Weyl points,which is attributed to the weak spin–orbital coupling *** topological surface states of VAs projected on semi-infinite(001)and(111)surfaces are *** Fermi arcs of all Weyl points are clearly visible on the projected Fermi *** findings suggest that VAs is a fully spin-polarized Weyl semimetal with many-body correlated effects in the effective U values range from 1.5 eV to 2.5 eV.

关键词： density functional theory Weyl semimetal dynamical mean field theory half metallic ferromagnet

Characteristics of volcanic reservoirsand hydrocarbon accumulation of Carboniferous System in Junggar Basin， China

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Journal of Earth Science 2020年

作者： xiaozhi wu Qiulin Guo Wei Zhang Dengfa He Xuefeng Qi Di Li Research Institute of Petroleum Exploration & Development， PetroChina School of Earth and Space Sciences， Peking University School of Energy Resources， China University of Geosciences

The Carboniferous volcanic reservoirs in Junggar Basin contain rich hydrocarbon resources， implying a great exploration potential， so that they have become a key replacement target for “three-dimensional exploration”. The study on the Carboniferous volcanic reservoirs and their hydrocarbon accumulation elements is significant for clarifying the orientation for exploration. In this paper， based on 37 reserves reports and 3，200 reservoir test data， the Carboniferous volcanic reservoirs in Junggar Basin were discussed from the prospective of lithology and lithofacies， physical properties， reservoir types， main controls on hydrocarbon accumulation， and hydrocarbon accumulation patterns. It is found that the Carboniferous in the basin is mostly in the multi-island ocean–volcanic island arc structural-sedimentary environment， so it is geologically eligible for forming in situ volcanic reservoirs. The volcanic rocks are: （1） mostly distributed along deep and large faults， with the lithology and lithofacies controlled by volcanic architectures; （2） dominantly lava， followed by volcaniclastic lava and volcaniclastic rock; （3） distributed in the periphery of hydrocarbon-generating sag and within the source rocks horizontally， and concentrated in the weathering crust at the top longitudinally， possibly leading to reworked weathering crust reservoir; and （4） liable to form inner reservoirs. The volcanic reservoirs can be concluded into four hydrocarbon accumulation patterns， i.e. self-generating & self-storing in paleo-uplift and vertical migration， self-generating & self-storing in paleo-uplift and lateral migration， young-generating & old-storing in fault zone and vertical migration， and young-generating & old-storing in paleo-uplift and lateral migration. Future exploration will focus on the effective source rock development and hydrocarbon supply zones and the self-generating & self-storing and young-generating & old-storing patterns. The exploration prospects are determine

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