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Enhanced electrical,mechanical and tribological properties of Cu-Cr-Zr alloys by continuous extrusion forming and subsequent aging treatment

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Journal of Materials Science & Technology 2022年第15期110卷 187-197页

作者： Zhe Shen Zhongze Lin Peijian Shi Jiale Zhu Tianxiang Zheng Biao ding Yifeng Guo Yunbo Zhong State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai 200444China

As a promising material for the new generation of high-speed railway contact wires,the comprehensive optimization of the electrical conductivity,strength,hardness and wear resistance of the Cu-Cr-Zr alloy has received extensive *** this paper,a high-performance Cu-1Cr-0.1Zr alloy with an ultimate tensile strength of 599.1 MPa,a uniform elongation of 8.6%,a microhardness of 195.7 HV_(0.2) and an electrical conductivity of 80.07%IACS was achieved by the continuous extrusion forming(CEF)and subsequent peak-aging *** grain refinement strengthening,dislocation strengthening and precipitation strengthening are identified to be responsible for the excellent electrical and mechanical properties of Cu-Cr-Zr *** wear behavior of Cu-Cr-Zr alloy was investigated by examining the evolution of worn surface morphology and subsurface *** microhardness(H)and reduced elastic modulus(E_(r))of the subsurface below the worn surface measured by nanoindentation were calculated to gage the tribological performance of Cu-Cr-Zr *** show that the continuously extruded and subsequently peak-aged specimen has the best wear resistance,which indicates that the tribological properties of CuCr-Zr alloy strongly depend on its strength and *** can be concluded that the CEF and subsequent aging treatment process provides a new and high-efficiency procedure for the continuous preparation of Cu-Cr-Zr alloys.

关键词： Cu-Cr-Zr alloy Continuous extrusion Electrical conductivity Mechanical properties Tribological properties

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Highly enhanced microwave absorption for carbon nanotube/barium ferrite composite with ultra-low carbon nanotube loading

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Journal of Materials Science & Technology 2022年第7期102卷 115-122页

作者： Yue-Yi wang Song-Yang wen-Jin Sun Kun Dai ding-Xiang Yan Zhong-Ming Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China

Barium ferrite(BaFe_(12)o_(19))is considered as potential microwave absorption(MA)material thanks to the large saturation magnetization,high Curie temperature,and excellent chemical *** integration of carbon nanotube(CNT)can improve the dielectric loss of BaFe_(12)o_(19)for further enhanced MA perfor-mance,nevertheless,the MA performance is still not desirable because of the poor CNT dispersion in the CNT/BaFe_(12)o_(19)composites,which usually prepared via the ball-milling method,unless high CNT loading was ***,according to the thermal stability of CNT in different atmosphere and the formation mechanism of BaFe_(12)o_(19)from precursor,CNT was introduced in the precursor of BaFe_(12)o_(19)uniformly during auto-ignition process and calcined under different *** CNT loading is only 2.0 wt%,the CNT/BaFe_(12)o_(19)composites obtained exhibits a minimum reflection loss(RL_(min))of-43.9 dB and effective bandwidth(with RLof 3.9 GHz with the thickness of 1.5 mm,which are much supe-rior to-10.2 dB and 2.2 GHz for pure BaFe_(12)o_(19),and-13.6 dB and 2.5 GHz for CNT/BaFe_(12)o_(19)composite prepared by ball-milling *** results may pave the way to design high-performance BaFe_(12)o_(19)based microwave absorbers.

关键词： Carbon nanotube Barium ferrite Microwave absorption

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Spatial prisoner’s dilemma games with increasing size of the interaction neighborhood on regular lattices

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Chinese Science Bulletin 2012年第7期57卷 724-728页

作者： wang Juan Xia ChengYi wang YiLing ding Shuai Sun JunQing Tianjin Univ Technol Tianjin Key Lab Control Theory & Complicated Ind Tianjin 300384 Peoples R China Tianjin Univ Technol Minist Educ Key Lab Comp Vis & Syst Tianjin 300384 Peoples R China Shanxi Normal Univ Sch Life Sci Linfen 041000 Peoples R China Hefei Univ Technol Inst Comp Network Syst Hefei 230009 Peoples R China

we studied the evolution of cooperation in the prisoner's dilemma game on a square lattice where the size of the interaction neighborhood is considered. Firstly, the effects of noise and the cost-to-benefit ratio on the maintenance of cooperation were investigated. The results indicate that the cooperation frequency depends on the noise and cost-to-benefit ratio: cooperation reaches a climax as noise increases, but it monotonously decreases and even vanishes with the ratio increasing. Furthermore, we investigated how the size of the interaction neighborhood affects the emergence of cooperation in detail. our study demonstrates that cooperation is remarkably enhanced by an increase in the size of the interaction neighborhood. However, cooperation died out when the size of the interaction neighborhood became too large since the system was similar to the mean-field system. on this basis, a cluster-forming mechanism acting among cooperators was also explored, and it showed that the moderate range of the neighborhood size is beneficial for forming larger cooperative clusters. Finally, large-scale Monte Carlo simulations were carried out to visualize and interpret these phenomena explicitly.

关键词：囚徒困境正方晶格相互作用合作伙伴游戏空间蒙特卡罗模拟成本效益

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End-of-treatment virologic response does not predict relapse after lamivudine treatment for chronic hepatitis B

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world Journal of Gastroenterology 2004年第24期10卷 3574-3578页

作者： Chun-JenLiu wen-LingHuang Pei-JerChen Ming-YangLai Jia-HorngKao ding-ShinnChen DivisionofGastroenterology DepartmentofInternalMedicineNationalTaiwanUniversityHospitalandNationalTaiwanUniversityCollegeofMedicineTaipei100TaiwanChina GraduateInstituteofClinicalMedicine NationalTaiwanUniversityHospitalandNationalTaiwanUniversityCollegeofMedicineTaipei100TaiwanChina

AIM: Attaining hepatitis B e antigen (HBeAg) seroconversion during lamivudine treatment is associated with fewer relapses in HBeAg-positive patients. In HBeAg-negative patients,predictors for post-treatment relapse remain largely *** therefore studied whether end-of-treatment virologic response correlated with relapse after lamivudine ***: we prospectively analyzed 12 HBeAg-negative patients and 14 HBeAg-positive patients with chronic hepatitis B, who received at least 9 mo of lamivudine treatment and were followed up for 12 mo post-treatment. Relapse of hepatitis B activity was defined by an elevation of serum ALT level above twice the upper limit of normal as well as reappearance of serum HBV DNA by the branched DNA assay or HBeAg during the follow-up period. The serum viral loads during and at the end of treatment were further determined by a quantitative real-time polymerase chain reaction ***: Relapse occurred in 6 (50.0%) HBeAg-negative patients within 12 mo post-treatment. Two relapsers had end-of-treatment serum viral load opies/mL, the proportion was not significantly different from that in the 6 non-relapsers (33.3% vs 16.7%; P = 1.00). Hepatitis B virus (HBV) DNA levels did not correlate with post-treatment relapse in HBeAg-positive patients either. However, genotype C patients tended to have a lower relapse rate than genotype B patients (14.3% vs57.9%, P= 0.08).CoNCLUSIoN: our results suggest that end-of-treatment virologic response cannot predict post-treatment relapse in patients with HBeAg-negative or -positive chronic hepatitis B. The impact of HBV genotype on the response to lamivudine treatment awaits further studies.

关键词：病原反应预报作用慢性乙型肝炎消化系统 HBeAg

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Relationship between vascular invasion and microvessel density and micrometastasis

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world Journal of Gastroenterology 2007年第46期13卷 6269-6273页

作者： Yan-Dong wang Pei wu Jia-ding Mao He Huang Fan Zhang Department of Surgery Wannan MedicalCollege Wuhu 24100 l Anhui Province China Department of Surgery Affiliated Yijishan Hospital Wannan Medical College Wuhu241001 Anhui Province China Department of Pathology Affiliated YijishanHospital Wannan Medical College Wuhu 241001 AnhuiProvince China

AIM： To evaluate the relationship between vascular invasion and microvessel density （MVD） of tissue and micrometastasis in blood. METHoDS： Vascular invasion was detected by both hematoxylin and eosin staining and immunohistochemiscal staining. Blood samples were collected from 17 patients with vascular invasion and 29 patients without vascular invasion and examined for cytokeratin20 （CK20） expression by reverse transcriptase-polymerase chain reaction （RT-PCR） analysis. Microvessel density of tissue samples was also determined by immunohistochemistry using antibodies to CD105. RESULTS： CK20 was detected in 12 of the 17 patients with vascular invasion and in 9 of the 29 patients without vascular invasion. Positive RT-PCR was significantly correlated with vascular invasion （70.6% vs 30.0%, P 〈 0.05）. The average MVD was significantly higher in patients with positive vascular invasion than in patients with negative vascular invasion （29.2 ± 3.3 vs 25.4 ± 4.7, P 〈 0.05）. The vascular invasion detected with hematoxylin-eosin staining was less than that with immunohistochemical staining. There was a significant difference between the two staining methods （19.6% vs 36.9%, P 〈 0.05）. CoNCLUSIoN： Positive CK20 RT-PCR, depth of tumor invasion, lymph node status, metastasis and MVD are significantly correlated with vascular invasion. Immunohistochemical staining is more sensitive than hematoxylin-eosin staining for detecting vascular invasion.

关键词： Vascular invasion Reverse transcriptase-polymerase chain reaction licrovessel density licrometastasis

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Comparative genome research between maize and rice using genomic in situ hybridization

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Chinese Science Bulletin 2001年第8期46卷 656-658,706页

作者： Shunbin Ning weiwei Jin Ling wang Yi ding Yunchun Song wuhan Univ Key Lab MOE Plant Wuhan 430072 Peoples R China

Using the genomic DNAs of maize and rice as probes respectively, the homology of maize and rice genomes was assessed by genomic in situ hybridization. when rice genomic DNAs were hybridized to maize, all chromosomes displayed many multiple discrete regions, while each rice chromosome delineated a single consecutive chromosomal region after they were hybridized with maize genomic DNAs. The results indicate that the genomes of maize and rice share high homology, and confirm the proposal that maize and rice are diverged from a common ancestor.

关键词： maize rice genome homology comparative cytogenetics genomic in situ hybridization.

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Sedimentology and foraminiferal paleoecology of the exposed oligocene-Miocene ogwashi-Asaba Formation in Issele-Uku area,Anambra Basin,southern Nigeria:A paleoenvironmental reconstruction

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Journal of Palaeogeography 2022年第4期11卷 618-628页

作者： J.A.Adeoye V.o.Jolayemi S.o.Akande Department of Geology and Mining Ibrahim Badamasi Babangida UniversityLapai 911101Niger StateNigeria Department of Geology and Mineral Sciences University of IlorinIlorin 240101Kwara StateNigeria

Sedimentological and foraminiferal paleoecological studies were carried out for the oligocene-Miocene ogwashi-Asaba Formation of the Anambra Basin at the Issele-Uku area in southern Nigeria,to reconstruct *** pattern of rock successions and textural characteristics suggest the prevalence of fluvio-deltaic setting during the formation of lignites and clastic rocks of ogwashi-Asaba *** benthic foraminiferal species such as Ammotium sp.,Textularia sp.,Gavelinella sp.,Milliamina sp.,Reophax sp.,Bolivina sp.,Eponides sp.,Pseudobolivina *** Lenticulina *** the shale units whereas the planktonic forms are *** these species have very low population and diversity in the shales,which could be due to the presence of harsh conditions such as low oxygen level and scarcity of food,leading to poor *** assessments of benthic foraminifera's habitat suggest middle-to-inner neritic marine environment for the *** results suggest fluvial environment for the sandstone and deltaic for the *** ogwashi-Asaba Formation in Issele-Uku area of Anambra Basin,southern Nigeria,therefore,have records of shallow marine,and fluvio-deltaic paleoenvironments.

关键词： Foraminiferal Sedimentology ogwashi-Asaba Formation Anambra Basin Paleoecology

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Self-healing poly(acrylic acid) hydrogels fabricated by hydrogen bonding and Fe^(3+) ion cross-linking for cartilage tissue engineering

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Frontiers of Materials Science 2023年第3期17卷 71-82页

作者： Min Kang Yizhu Cheng Yinchun Hu Huixiu ding Hui Yang Yan wei Di Huang Research Center for Nano-Biomaterials&Regenerative Medicine Department of Biomedical EngineeringCollege of Biomedical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

Autonomous self-healing hydrogels were achieved through a dynamic combination of hydrogen bonding and ferric ion(Fe^(3+))migration.N,N′-methylenebis(acrylamide)(MBA),a cross-linking agent,was added in this ***(acrylic acid)(PAA)/Fe^(3+)and PAA–MBA/Fe^(3+)hydrogels were prepared by introducing Fe^(3+)into the PAA hydrogel *** ionic bonds were formed between Fe^(3+)ions and carboxyl *** microstructure,mechanical properties,and composition of hydrogels were characterized by field emission scanning electron microscopy and Fourier transform infrared *** experimental results showed that PAA/Fe^(3+)and PAA–MBA/Fe^(3+)hydrogels healed themselves without external *** PAA/Fe^(3+)hydrogel exhibited good mechanical properties,i.e.,the tensile strength of 50 kPa,the breaking elongation of 750%,and the self-healing efficiency of 82%.Meanwhile,the PAA–MBA/Fe^(3+)hydrogel had a tensile strength of 120 *** fabricated hydrogels are biocompatible,which may have promising applications in cartilage tissue engineering.

关键词： poly(acrylic acid) hydrogel cartilage tissue self-healing

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Reduction Mechanism of Chromite ore in Blast Furnace

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Journal of Iron and Steel Research International 2004年第4期11卷 19-23页

作者： LI Yi-wei ding wei-zhong LU Xiong-gang XU Kuang-di Shanghai University

The structural changes and reduction degree of chromite ore in blast furnace were studied by optical micrograph analysis,scanning electron microscope(SEM)and energy dispersive X-ray analysis(EDXA).The smelting reducti... 详细信息

关键词： smelting reduction chromite ore mechanism blast furnace

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Numerical simulation of a high-speed landslidein Chenjiaba, Beichuan, China

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Journal of Mountain Science 2017年第11期14卷 2137-2149页

作者： HUANG Tao ding Ming-tao SHE Tao TIAN Shu-jun YANG Jiang-tao School of Environment and Resources Southwest University of Science and Technology Faculty of Geosciences and Environmental Engineering Southwest Jiaotong University Institute of Exploration Technology Chinese Academy of Geological Sciences School of Civil Engineering and Architecture Southwest University of Science and Technology

High-speed landslide is a catastrophic geological disaster in the mountainous area of southwest China. To predict the movement process of landslide reactivation in Chenjiaba town, Beichuan county, Sichuan province, China, we simulated the movement process of two landslide failures in Chenjiaba via rapid mass movement simulation and unmanned aerial vehicle images(UAV), and obtained the movement characteristic parameters of the landslides. According to a back analysis, the most remarkable fitting rheological parameters were friction coefficient(μ=0.18) and turbulence(). The parameter of landslide pressure was applied as the zoning index of landslide hazard to obtain the influence zone and hazard zoning map of the Chenjiaba landslide. Results show that the Duba River was blocked quickly with a landslide accumulation at the maximum height of 44.14 mwhen the Chenjiaba deposits lost stability. The hazard zoning map indicated that the landslide hazard degree is positively correlated with the *** landslide assessment is a quantitative hazard assessment method based on a landslide movement process and is suitable for high-speed landslide. Such method can provide a scientific basis for urban construction and planning in the landslide hazard area to avoid hazards effectively.

关键词： Mass movement simulation High speedlandslide Numerical simulation Hazard assessment Chenjiaba landslide Landslide pressure

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