检索结果-南通市图书馆

Rare Metals 2017年第10期36卷 792-798页

作者： Gang Liu Lin Liu Zhen-Hua Han guo-jun zhang jun zhang School of Materials Science and Engineering Xi'an University of Technology Xi'an 710048 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China

To clarify the solidification behavior of Re- and Ru-containing Ni-based single-crystal superalloys, four experimental alloys with varied contents of Re and Ru were investigated by differential scanning calorimetry （DSC） and metallographic techniques. To obtain the - solvus temperatures, the stepwise solution and aging heat treatments were used. DSC analysis shows that Re leads to the increase in freezing range and γ-solvus temperature. On the contrast, Ru only has negligible influence on the freezing range, but leads to the lower γ-solvus temperature. In comparison with Ru, Re leads to more severe segregation and higher eutectic fractions in as-cast microstructures. Furthermore, the castability and phase stability of Ni-based superalloys were analyzed by the results of DSC and metallographic analysis, such as freezing range, critical nucleation temperature, γ-solvus temperature and eutectic fractions. It shows that Re leads to the wider freezing range and lower critical nucleation temperature, indicating the worse castability of Re-con- taining Ni-based single-crystal superalloys.

关键词： Ni-based single-crystal alloys Solidification behavior Metallography Thermal analysis

In-situ ZrB2-hBN ceramics with high strength and low elasticity

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第13期47卷 186-193页

作者： Ji Zou guo-jun zhang Zheng-Yi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Metallurgy and Materials University of BirminghamB152TTBirminghamUK State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsDonghua UniversityShanghai 201620China

ZrB2 ceramics with various hexagonal BN(hBN)additions up to 37 vol%were reactively densified by spark plasma sintering using powder mixtures containing ZrB2,ZrN and ***-boron based additives effectively promoted the densification process,ZrB2 ceramics reached>99%relative density at 2000℃and an applied pressure of 60 MPa with only 5 vol%in-situ formed hBN,whereas the relative density of pure ZrB2 was only 91.2%at the same *** thehBN contents,the morphology of hBN grains gradually changed from quasi-spherical to flake dominated,which has substantial influence on their mechanical ***-situ ZrB2-10 vol%hBN ceramics demonstrated high flexural strength of 597±22 MPa,relatively low Young’s modulus of 406 GPa and good machinability,especially for the impressively large strain to failure(1.47×10^-3)which is superior to most of their counterparts in the ZrB2 based particulate reinforced ceramics.

关键词： ZrB2 Reactive sintering Spark plasma sintering Boron nitride containing ceramics Mechanical property

Quantitative evaluation of multi-process collaborative operation in steelmaking–continuous casting sections

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1353-1366页

作者： Jian-ping Yang Qing Liu Wei-da guo jun-guo zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Engineering Research Center of MES Technology for Iron&Steel Production Ministry of EducationBeijing 100083China Laiwu iron and Steel Group Yinshan Section Steel Co. Ltd.Jinan 271104China Hesteel Group Tangsteel Company Tangshan 063000China

The quantitative evaluation of multi-process collaborative operation is of great significance for the improvement of production planning and scheduling in steelmaking–continuous casting sections(SCCSs). However, this evaluation is difficult since it relies on an in-depth understanding of the operating mechanism of SCCSs, and few existing methods can be used to conduct the evaluation, due to the lack of full-scale consideration of the multiple factors related to the production operation. In this study, three quantitative models were developed, and the multiprocess collaborative operation level was evaluated through the laminar-flow operation degree, the process matching degree, and the scheduling strategy availability degree. Based on the evaluation models for the laminar-flow operation and process matching levels, this study investigated the production status of two steelmaking plants, plants A and B, based on actual production data. The average laminar-flow operation(process matching) degrees of SCCSs were obtained as 0.638(0.610) and 1.000(0.759) for plants A and B, respectively, for the period of April to July 2019. Then, a scheduling strategy based on the optimization of the furnace-caster coordinating mode was suggested for plant A. Simulation experiments showed higher availability than the greedy-based and manual strategies. After the proposed scheduling strategy was applied,the average process matching degree of the SCCS of plant A increased by 4.6% for the period of September to November 2019. The multi-process collaborative operation level was improved with fewer adjustments and interruptions in casting.

关键词： steelmaking–continuous casting multi-process collaborative operation quantitative evaluation model laminar-flow operation process matching scheduling strategy

A Novel MILP Model for N-vehicle Exploration Problem

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2021年第2期9卷 359-373页

作者： guo-jun zhang Jin-Chuan Cui Academy of mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

The N-vehicle exploration problem(NVEP)is a nonlinear discrete scheduling problem,and the complexity status remains *** our knowledge,there is no literature until now employing mixed integer linear programming(MILP)technology to solve this problem except for Wang(J Oper Res Soc China 3(4):489–498,2015).However,they did not give numerical experiments since their model existed strictly inequalities and the number of constraints was up to O(n3),which was inefficient to solve practical *** paper establishes a more concise MILP model,where the number of constraints is just O(n2).Therefore,the existing efficient MILP algorithms can be used to solve ***,we provide some properties of N-vehicle problem and give three methods for cutting plane construction,which can increase the solving speed ***,a numerical experiment is provided to verify the effectiveness and robustness for different instances and scales of acceleration techniques.

关键词： N-vehicle exploration problem(NVEP) MILP Cutting plane

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2016年第2期29卷 181-187页

作者： Kai Wu Jin-Yu zhang Gang Liu Jiao Li guo-jun zhang jun Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University School of Materials Science and Engineering Xi’an University of Technology

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quan- titatively estimate the interfacial energy of the nanostructured multilayer films （NMFs） adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be ~ 5.0 J/m2 for Cu/Cr, ~4.1 J/m2 for Cu/Ta, ~ 2.8 J/m2 for Cu/Mo, ~ 1.1 J/m2 for Cu/Nb, and ~ 1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.

关键词： Uniaxial tensile testing Nanostructured multilayer films Flexible substrates Bucklingbehaviors Adhesion energy

Equiatomic 9-cation high-entropy carbide ceramics of the IVB,VB,and VIB groups and thermodynamic analysis of the sintering process

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第7期11卷 1082-1092页

作者： Yuan QIN Ji-Xuan LIU Yongcheng LIANG guo-jun zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China College of Science Donghua UniversityShanghai 201620China

The preparation of high-entropy(HE)ceramics with designed composition is essential for verifying the formability models and evaluating the properties of the ***,inevitable oxygen contamination in non-oxide ceramics will result in the formation of metal oxide impurity phases remaining in the specimen or even escaping from the specimen during the sintering process,making the elemental compositions of the HE phase deviated from the designed *** this work,the preparation and thermodynamic analysis during the processing of equiatomic 9-cation HE carbide(HEC9)ceramics of the IVB,VB,and VIB groups were studied focusing on the removing of the inevitable oxygen impurity existed in the starting carbide powders and the oxygen contamination during the powder mixing *** results demonstrate that densification by spark plasma sintering(SPS)by directly using the mixed powders of the corresponding single-component carbides will inhibit the oxygen-removing carbothermal reduction reactions,and most of the oxide impurities will remain in the sample as(Zr,Hf)O_(2)*** of the mixed powders at high temperatures in vacuum will remove most part of the oxygen impurity but result in a remarkable escape of gaseous Cr owing to the oxygen-removing reaction between Cr_(3)C_(2)and various oxide *** is found that graphite addition enhances the oxygen-removing effect and simultaneously prevents the escape of gaseous *** the other hand,although WC,VC,and Mo2C can also act as oxygen-removing agents,there is no metal-containing gaseous substance formation in the temperature range of this *** using the heat-treated powders with added graphite,equiatomic HEC9 ceramics were successfully prepared by SPS.

关键词： high-entropy(HE)carbide oxygen impurity carbothermal reduction reaction phase composition thermodynamic analysi

Sol–gel derived porous ultra-high temperature ceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2020年第1期9卷 1-16页

作者： Fei LI Xiao HUANG Ji-Xuan LIU guo-jun zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsDonghua UniversityShanghai 201620China Institute for the Conservation of Cultural Heritage Shanghai UniversityShanghai 200444China

Ultra-high temperature ceramics(UHTCs)are considered as a family of nonmetallic and inorganic materials that have melting point over 3000℃.Chemically,nearly all UHTCs are borides,carbides,and nitrides of early transition metals(e.g.,Zr,Hf,Nb,Ta).Within the last two decades,except for the great achievements in the densification,microstructure tailoring,and mechanical property improvements of UHTCs,many methods have been established for the preparation of porous UHTCs,aiming to develop high-temperature resistant,sintering resistant,and lightweight materials that will withstand temperatures as high as 2000℃for long periods of *** the synthesis methods for porous UHTCs,sol–gel methods enable the preparation of porous UHTCs with pore sizes from 1 to 500μm and porosity within the range of 60%–95%at relatively low *** this article,we review the currently available sol–gel methods for the preparation of porous ***,foaming,and solvent evaporation methods are described and compared in terms of processing–microstructure *** properties and high temperature resistance of sol–gel derived porous UHTCs are ***,directions to future investigations on the processing and applications of porous UHTCs are proposed.

关键词： sol–gel ultra-high temperature ceramics porous ceramics processing microstructure

Molecular and functional imaging in cancer-targeted therapy:current applications and future directions

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2023年第3期8卷 1112-1143页

作者： Jing-Wen Bai Si-Qi Qiu guo-jun zhang Fujian Key Laboratory of Precision Diagnosis and Treatment in Breast Cancer Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen University361100 XiamenChina Xiamen Key Laboratory of Endocrine-Related Cancer Precision Medicine Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen University361100 XiamenChina Xiamen Research Center of Clinical Medicine in Breast and Thyroid Cancers Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen University361100 XiamenChina Department of Breast-Thyroid-Surgery and Cancer Center Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen University361100 XiamenChina Department of Medical Oncology Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen University361100 XiamenChina Cancer Research Center of Xiamen University School of MedicineXiamen University361100 XiamenChina Diagnosis and Treatment Center of Breast Diseases Clinical Research CenterShantou Central Hospital515041 ShantouChina Guangdong Provincial Key Laboratory for Breast Cancer Diagnosis and Treatment Shantou University Medical College515041 ShantouChina

Targeted anticancer drugs block cancer cell growth by interfering with specific signaling pathways vital to carcinogenesis and tumor growth rather than harming all rapidly dividing cells as in cytotoxic *** Response Evaluation Criteria in Solid Tumor(RECIST)system has been used to assess tumor response to therapy via changes in the size of target lesions as measured by calipers,conventional anatomically based imaging modalities such as computed tomography(CT),and magnetic resonance imaging(MRI),and other imaging ***,RECIST is sometimes inaccurate in assessing the efficacy of targeted therapy drugs because of the poor correlation between tumor size and treatment-induced tumor necrosis or *** approach might also result in delayed identification of response when the therapy does confer a reduction in tumor *** molecular imaging techniques have rapidly gained importance in the dawning era of targeted therapy as they can visualize,characterize,and quantify biological processes at the cellular,subcellular,or even molecular level rather than at the anatomical *** review summarizes different targeted cell signaling pathways,various molecular imaging techniques,and developed ***,the application of molecular imaging for evaluating treatment response and related clinical outcome is also systematically *** the future,more attention should be paid to promoting the clinical translation of molecular imaging in evaluating the sensitivity to targeted therapy with biocompatible *** particular,multimodal imaging technologies incorporating advanced artificial intelligence should be developed to comprehensively and accurately assess cancer-targeted therapy,in addition to RECIST-based methods.

关键词： targeted drugs directions

Modeling of LF refining process:a review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第2期31卷 289-317页

作者： Zi-cheng Xin Jiang-shan zhang Kai-xiang Peng jun-guo zhang Chun-hui zhang Qing Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China Tangshan Branch Hebei Iron and Steel Co.Ltd.Tangshan063000HebeiChina Xinjiang Bayi Iron and Steel Co. Ltd.Baosteel GroupWulumuqi830022XinjiangChina

With the increasing demand for energy conservation and emission reduction,more attentions have been paid to the intelligentization,greenization and low carbonization during the transformation and upgrading of steelmaking *** furnace(LF)refining is one of the key procedures in steelmaking process and has been widely used in steelmaking plants for its high equipment matching degree,low equipment investment and outstanding refining *** to the main tasks of LF refining process,the modeling methods of temperature prediction model,slag-making model,alloying model,argon blowing model and model of inclusions behavior were systematically reviewed,and the advantages and disadvantages of each modeling method were *** addition,the technical framework for the future has also been proposed based on existing works,including classification of raw materials,graphic representation of knowledge,introduction,upgradation and management of device/equipment,customization of steelmaking,modeling of refining process,synergy of models,intelligentization of decision-making,automation of control,and digitization of processes and operations,aiming to provide a reference for the modeling and intelligent development of LF refining process.

关键词： LF refining Temperature prediction Slag-making Alloying Argon blowing Inclusion behavior Modeling method

Layer Thickness-Dependent Hardness and Strain Rate Sensitivity of Cu–Al/Al Nanostructured Multilayers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2016年第2期29卷 156-162页

作者： Ya-Qiang Wang Zhao-Qi Hou Jin-Yu zhang Xiao-Qing Liang Gang Liu guo-jun zhang jun Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University School of Materials Science and Engineering Xi’an University of Technology

Cu-Al/Al nanostructured metallic multilayers with Al layer thickness hAl varying from 5 to 100 nm were prepared, and their mechanical properties and deformation behaviors were studied by nanoindentation testing. The results showed that the hardness increased drastically with decreasing hAl down to about 20 nm, whereafter the hardness reached a plateau that approaches the hardness of the alloyed Cu-Al monolithic thin films. The strain rate sensitivity （SRS, m）, however, decreased monotonically with reducing hAl. The layer thickness-dependent strengthening mechanisms were discussed, and it was revealed that the alloyed Cu-Al nanolayers dominated at hAl≤ 20 nm, while the crystalline Al nanolayers dominated at hAl 〉 20 nm. The plastic deformation was mainly related to the ductile Al nanolayers, which was responsible for the monotonic evolution of SRS with hAl. In addition, the hAFdependent hardness and SRS were quanti- tatively modeled in light of the strengthening mechanisms at different length scales.

关键词： Nanostructured films Cu-Al/Al multilayers Hardness Strain rate sensitivity Layer thickness dependence