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Formation and evolution of supercritical geofluid

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Science China Earth Sciences 2025年第1期68卷 39-51页

作者： Huaiwei NI Yilin XIAO Xiaolin XIONG Xiandong LIU Chunxiao GAO Yi-xiang chen Yunguo LI Wan-Cai LI Xuan GUO Yang-Yang WANG Dong-Bo TAN Li ZHANG State Key Laboratory of Lithospheric and Environmental Coevolution University of Science and Technology of China Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of China Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Sciences and Engineering Nanjing University State Key Lab of Superhard Materials Jilin University

In this work, we provide a comprehensive review on the formation, evolution, properties, and effects of supercritical geofluid. In Earth's interior, enhanced miscibility between H2O and silicate by the addition of special components or by the increase of pressure and temperature gives rise to supercritical geofluid with a significant amount of both H2O and silicate *** formation of supercritical geofluid in magmatic-hydrothermal systems, typified by pegmatite system, is governed by meltfluid critical curve. The formation of supercritical geofluid in metamorphic systems, typified by subducted slab, is governed by the second critical end point. Experimental results suggest that the presence of boron and fluorine in pegmatite system makes it possible to form supercritical geofluid at crustal depths, but the release of supercritical geofluid from subducted slab is withheld until almost 100 km depth. A major presence of both H2O and depolymerized structural units（monomers, dimers, etc.） endows supercritical geofluid with unique physical properties including low density, low elastic moduli, low viscosity, high diffusivity,and high electrical conductivity. Supercritical geofluid can effectively mobilize a variety of elements even including high field strength elements and heavy rare earth elements. The chemical signatures of supercritical geofluid can be inherited by metasomatized mantle and mantle-derived melts, and this could give an explanation of the oxidation of arc magmas. Phase separation of supercritical geofluid through the mechanism of spinodal decomposition leads to formation of a melt network. Multiphase fluid inclusions recovered from subduction zone rocks and pegmatites are possible relics of supercritical geofluid. Supercritical geofluid can cause electrical anomaly and low seismic velocity near the top of subducted slab, and can be linked with intermediate-focus earthquakes. Supercritical geofluid may have played a crucial role in the formation of pe

关键词： Supercritical geofluid Miscibility Subduction zone Pegmatite

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国家级一流本科专业建设点的布局及特征分析

黑龙江高教研究 2025年第2期43卷 8-16页

作者：陈祥祺厦门大学福建厦门361005

国家级一流本科专业的建设工作体现一流本科、一流专业和一流人才的建设旨向,其布局更深谙着我国一流本科教育的长远规划,故尝试对收集到的11 502个国家级一流本科专业建设点进行基本情况的统计分析和空间布局的聚类分析,借此明晰国家... 详细信息

国家级一流本科专业的建设工作体现一流本科、一流专业和一流人才的建设旨向,其布局更深谙着我国一流本科教育的长远规划,故尝试对收集到的11 502个国家级一流本科专业建设点进行基本情况的统计分析和空间布局的聚类分析,借此明晰国家级一流本科专业建设点在全国范围内的地域分布及配置情况。结果显示:国家级一流本科专业建设点的布局存续着“三不均”和“三具有”之特征,即国家级一流本科专业建设点的地域分布不均、校际分布不均和学科分布不均,具有重点的区域集聚、具有鲜明的战略导向和具有动态的调整机制。有鉴于此,有针对性地提出具体的实践策略,以期为国家级一流本科专业建设点全面落实“双万计划”的目标要求提供指引。

关键词：一流本科教育国家级一流本科专业建设点布局特征

Experimental isothermal section phase diagram of Ho-Fe-In at 773 K and magnetic properties of Ho_(12)Fe_(2.08)In_(2.92) alloy

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Rare Metals 2021年第4期40卷 987-994页

作者： xiang chen Chao Ni The College of Physics and Electronic Information Engineering Neijiang Normal UniversityNeijiang 641002China The Ames Laboratory U.S.Department of EnergyIowa State UniversityAmesIA 50011-3020USA

The isothermal section of the Ho-Fe-In system at 773 K has been constructed by X-ray powder *** known structure ternary compound Er_(12)Fe_(2) In_(3)-type Ho_(12)Fe_(2) In_(3) has been *** the same time,solid solutions are not detected in Ho-Fe-In system at 773 *** magnetic transition and magnetocaloric effect of Ho_(12)Fe_(2.08)In_(2.92) alloy with Er_(12)Fe_(2) In_(3)-type structure were investigated by magnetic susceptibility and isothermal magnetization *** normal antiferromagnetic-paramagnetic transition and another abnormal one are discovered at 18 and 76 K in ground state,*** to a first-order field-induced metamagnetic transition(antiferromagnetic-ferromagnetic) at/below the Neel temperature of 18 K),the negative entropy changes are observed at corresponding *** is only a second-order ferromagnetic-paramagnetic transition near Curie temperature(TC),the maximum entropy change(Δ_(Smax)) values are-6.14 J·kg^(-1)·K^(-1) at 3 K and 7.88 J·kg^(-1)·K^(-1) at 28 K in a field range of 0-7 *** reversible relative cooling power corresponding to negative entropy change can reach about 600 J·kg^(-1) in an wide operating temperature region Δ_(Tcycl)=74 K from 16 to90 K,which suggests that Ho_(12)Fe_(2.08)In_(2.92) could be a potential material for magnetic refrigeration in the corresponding temperature range.

关键词： Re_(3(x+y))(T2)_(x)X_(y)phase Metamagnetic transition Magnetothermal properties Ho-Fe-In alloy

A low-to-high friction transition in gradient nano-grained Cu and Cu–Ag alloys

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Friction 2021年第6期9卷 1558-1567页

作者： xiang chen Zhong HAN Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China

A unique low-to-high friction transition is observed during unlubricated sliding in metals with a gradient nano-grained(GNG)surface *** persisting in the low-friction state(0.2–0.4)for tens of thousands of cycles,the coefficients of friction in the GNG copper(Cu)and copper-silver(Cu–5Ag)alloy start to increase,eventually reaching a high level(0.6–0.8).By monitoring the worn surface morphology evolution,wear-induced damage accumulation,and worn subsurface structure evolution during sliding,we found that the low-to-high friction transition is strongly correlated with distinct microstructural instabilities induced by vertical plastic deformation and wear-off of the stable nanograins in the subsurface layer.A very low wear loss of the GNG samples was achieved compared with the coarse-grained sample,especially during the low friction *** results suggest that it is possible to postpone the initiation of low-to-high friction transitions and enhance the wear resistance in GNG metals by increasing the GNG structural stability against grain coarsening under high loading.

关键词： gradient nano-grained metals Cu and Cu–Ag alloy low-to-high friction transition subsurface plastic deformation wear

Lipschitz Continuous Solutions to the Cauchy Problem for Quasi-linear Hyperbolic Systems

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Chinese Annals of Mathematics,Series B 2012年第4期33卷 521-536页

作者： xiang chen School of Mathematical Sciences Fudan University Shanghai 200433 China.

Lipschitz continuous solutions to the Cauchy problem for 1-D first order quasi-linear hyperbolic systems are considered. Based on the methods of approximation and integral equations, the author gives two definitions o... 详细信息

关键词： First order quasi-linear hyperbolic systems Lipschitz continuous solution Cauchy problem Existence and uniqueness

Studies of short-time and high-temperature annealing and magnetic property of LaFe_(11.4)Si_(1.6) compound

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Acta Metallurgica Sinica(English Letters) 2011年第5期24卷 390-398页

作者： xiang chen Yungui chen Yongbo TANG School of Materials Science and Engineering Sichuan University Chengdu 610065 China Department of Physics and Electronic Informational Engineering Neijiang Teachers College Neijiang 641002 China

The LaFe11.4Si1.6 compounds are prepared by arc-melting and then annealed at different high temperatures from 1323 K （5 h） to 1623 K （2 h）. The powder X-ray diffraction （XRD） and microstructure observations show that large amount of 1：13 phase begins to appear in the LaFe11.4Si1.6 compound annealed at 1423 K （5 h）. In the temperature range from 1423 K to 1523 K, the α-Fe and LaFeSi phases rapidly decrease to form 1：13 phase. The LaFeSi phase is rarely observed by XRD when the as-cast compound is annealed at 1523 K （5 h）. With annealing temperature increasing to 1573 K, LaFeSi phase is detected again in LaFe11.4Si1.6 compound. In LaFe11.4Si1.6 compounds annealed at 1523 K （5 h）, at 1373 K （2 h）＋1523 K （5 h）, and 1523 K （7 h）＋1373 K （2 h）, the impurity phases including small amount of α-Fe and LaFeSi phase reduce in turn. The magnetic measurement shows that LaFe11.4Si1.6 compounds annealed by above three processes keep the first-order of magnetic transition behavior, and Tc are both at about 200 K. But the values of the maximal ASM（T, H） of has large difference, they are 9.94, 12.66, and 13.96 J/（kg.K） under a magnetic field of 0- 2 T, respectively.

关键词： LaFe11.4Sil.6 compound Short-time and high-temperature an-nealing Phase transition Magnetic property

The effect of high-temperature annealing on LaFe_(11.5)Si_(1.5) and the magneto-caloric properties of La_(1-x)Ce_xFe_(11.5)Si_(1.5) compounds

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Rare Metals 2011年第4期30卷 343-347页

作者： chen xiang chen Yungui TANG Yongbo School of Materials Science and Engineering Sichuan University Chengdu 610065 China Department of Physics and Electronic Informational Engineering Neijiang Teachers College Neijiang 641002 China

The powder X-ray diffraction patterns of ***.5 compounds annealed at different high temperatures from 1323 K （5 h） to 1623 K （2 h） show that a large amount of 1：13 phase begins to form in ***5 compound annealed at 1423 K （5 h）. In the temperature range from 1423 to 1523 K, ^-Fe and LaFeSi phases rapidly decrease to form 1：13 phase. LaFeSi phase is rarely observed, and the most amount of 1：13 phase is obtained in the compound annealed at 1523 K （5 h）. With the annealing temperature increasing to 1573 and 1623 K, LaFeSi is detected again in the ***.s compound. According to the results of annealing at different high-temperatures, the ***.5 compounds are annealed at high temperatures of 1373 K （2 h）＋ 1523 K （5 h）. The main phase is NaZn13-type phase, and the impurity is a small amount of et-Fe in ***.5 compounds with 0 〈 x 〈 0.35, and there is a large amount of CeaFe17 phase in ***.s. It indicates that the substitution of cerium atoms for La in LaFelLsSil.5 compounds has limit. At the same time, the substitution of Ce for La has large effect on magnetocaloric properties. With increasing Ce content from x = 0 to x = 0.35, the Curie temperature decreases linearly from 196 to 168 K, the magnetic entropy change increases from 16.5 to 57.3 J-kg-kK-1 in a low magnetic field change of 0-2 T, and the thermal hysteresis also increases from 3 K to 8 K.

关键词： rare earth compounds high-temperature annealing magnetocaloric effect phase composition

iGMDR:Integrated Pharmacogenetic Resource Guide to Cancer Therapy and Research

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Genomics, Proteomics & Bioinformatics 2020年第2期18卷 150-160页

作者： xiang chen Yi Guo Xin chen Institute of Pharmaceutical Biotechnology and the First Affiliated Hospital Department of Radiation Oncology Zhejiang University School of MedicineHangzhou 310058China Department of Polymer Science and Engineering and Key Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang Province Zhejiang UniversityHangzhou 310027China Joint Institute for Genetics and Genome Medicine between Zhejiang University and University of Toronto Zhejiang UniversityHangzhou 310058China

Current pharmacogenetic studies have obtained many genetic models that can predict the therapeutic efficacy of anticancer *** some of these models are of crucial importance and have been used in clinical practice,these very valuable models have not been well adopted into cancer research to promote the development of cancer therapies due to the lack of integration and standards for the existing data of the pharmacogenetic *** this purpose,we built a resource investigating genetic model of drug response(iGMDR),which integrates the models from in vitro and in vivo pharmacogenetic studies with different omics data from a variety of technical *** this study,we introduced a standardized process for all integrations,and described how users can utilize these models to gain insights into *** is freely accessible at https://***.

关键词： Genetic model Pharmacogenetics Anticancer drug Cancer Drug response

Orientation-Dependent Morphology and Evolution of Interfacial Dislocation Networks in Ni-Based Single-Crystal Superalloys:A Molecular Dynamics Simulation

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Acta Mechanica Solida Sinica 2021年第1期34卷 79-90页

作者： Bin chen Wen-Ping Wu Ming-xiang chen Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

In this paper,the morphology and evolution of interfacial dislocation networks of(100),(110)and(111)interphases of Ni-based single-crystal superalloys are studied by molecular dynamics(MD)***-dimensional cubic-type and sandwich-type models are chosen to explore the orientation-dependent morphology of dislocation networks,and their respective advantages and disadvantages are *** the simulations,it is observed that various lattice orientations and model types lead to different morphologies of dislocation *** on the analysis of average atomic energy and dislocation characteristics,the(100)orientation model has a more regular dislocation network,lower energy and better stability than the(110)and(111)orientation models after MD relaxation,which are supported by previous experimental and numerical ***,the cubic-type model has lower energy and better stability than the sandwich-type *** will be helpful for choosing a more appropriate and reasonable model for simulating the interfacial dislocation networks of Ni-based single-crystal superalloys.

关键词： Ni-based single-crystal superalloys Molecular dynamics simulation Orientation Interfacial dislocation networks