A5047036012- Welding Techniques and Residual Stresses
- Metal Alloys Wear and Properties
- Advanced Welding Techniques Analysis
- Engineering and Environmental Studies
- Carbon Nanotubes in Composites
- Nanopore and Nanochannel Transport Studies
- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Graphene research and applications
- Advancements in Battery Materials
- Microstructure and Mechanical Properties of Steels
- Cyclopropane Reaction Mechanisms
- Catalytic C–H Functionalization Methods
- Additive Manufacturing Materials and Processes
- Vacuum and Plasma Arcs
- Synthesis and Reactivity of Heterocycles
- Ferroelectric and Piezoelectric Materials
- Natural product bioactivities and synthesis
- Advanced ceramic materials synthesis
- Advanced materials and composites
- Supercapacitor Materials and Fabrication
- High Entropy Alloys Studies
- MXene and MAX Phase Materials
- Advanced Battery Materials and Technologies
- Multicomponent Synthesis of Heterocycles
Anhui Normal University
2021-2024
Tsinghua University
2006-2024
Second Institute of Oceanography
2020-2024
Ministry of Natural Resources
2020-2024
North China University of Science and Technology
2020-2022
Lanzhou Jiaotong University
2019-2020
Southwest Jiaotong University
2017
Longdong University
2017
Chinese Academy of Geological Sciences
2016
China Geological Survey
2016
Abstract A unique watermelon‐like structured SiO x –TiO 2 @C nanocomposite is synthesized by a scalable sol–gel method combined with carbon coating process. Ultrafine TiO nanocrystals are uniformly embedded inside particles, forming dual‐phase cores, which coated outer shells. The incorporation of component can effectively enhance the electronic and lithium ionic conductivities release structure stress caused alloying/dealloying Si maximize capacity utilization modifying Si–O bond feature...
A Brønsted acid catalyzed aza-Friedel–Crafts reaction of indolizines with 3-hydroxyisoindolinones has been established, which constructs isoindolinone derivatives bearing a tetrasubstituted stereocenter in good to high yields and enantioselectivities. Notably, this strategy provides new access C1-functionalization excellent regioselectivities. Moreover, intriguing C1-regioselective transformation was induced under thermodynamic control.
We report herein a highly straightforward strategy for the synthesis of new axially chiral 3-arylindolizine scaffold via organocatalytic asymmetric arylation reactions indolizines and p-quinone esters. Using phosphoric acid catalyst, series 3-arylindolizines were accessed in good to excellent yields atropo-enantioselectivities. This approach features broad substrate scope, mild reaction conditions, scalability, facile derivatization. Moreover, preliminary investigations based on nonlinear...
In this paper, the ER5356 aluminum alloy wire was used for cold metal transfer (CMT) welding of 5083-H111 base with 20 mm thickness. The effects four shielding gases, which were 100%Ar, 75%Ar+25%He, 50%Ar+50%He and 100%He on weld formation, microstructure mechanical properties investigated using optical microscope, scanning electron microscope (SEM), x-ray diffraction (XRD) testing. results showed that increase He in gas, penetration width increased, porosity zone decreased significantly;...
U75V rail steel rods underwent continuous-drive friction welding (CDFW). Joint properties were evaluated through microstructural analysis and mechanical testing (tensile, impact, microhardness). The thermo-mechanical behaviour of the CDFW process was simulated by finite element method, while a computed continuous cooling transformation diagram used to predict phase transformation, microstructures, hardness variations. By reducing spindle speed 1000 r/min, peak temperature in weld centre zone...
In this paper, Fe–Cr–C–W surfacing alloys was prepared by adopting arc additive technology with optimized Cr and W contents in flux-cored wire. The microstructure, hard phase, hardness wear resistance of investigated optical microscopy, electron testing. results show that the increase W, microstructure changes from full ferrite to martensite, ferrite, retained austenite, carbides other multiphase such as (Cr, Fe)7C3, WC Fe2W, etc. damage behavior gradually severe abrasive a small amount...
An organocatalytic highly diastero- and enantioselective Friedel-Crafts conjugate addition of indolizines to prochiral cyclopentenediones has been successfully developed. This desymmetric transformation provides a direct access the desired indolizine-substituted cyclopentanediones in yields 62-91% excellent stereoselectivities. The utility approach was demonstrated by diverse late-stage functionalizations through reduction or oxidation. Importantly, sp2 C-H functionalization with...
To provide the basic information about release of heavy metals from pyrite tailings Huangjiagou mine, were investigated through a series batch experiments under different initial pH extractant, temperature, liquid-solid (LS) ratio, and soaking time conditions. Moreover, calcium carbonate was added in to determine reduction effect on metals. The results show that Fe, Cr, Cu, Mn, Zn, Ni major tailings. Low high LS ratio significantly promoted Ni, Zn release, temperature release. Only small...
With the rapid development of high-speed railway, wheel/rail premature wear and fatigue cracks occur frequently. Laser cladding high-quality coatings with high resistance on damaged surface can prolong its service life. In this review, latest research progress laser Fe-based, Co-based Ni-based railway wheels/rails at home abroad is reviewed. It concluded that alloy are better than those other coatings. Adding strengthening elements to powders improve welding process comprehensive properties...
High-manganese steels, due to their unique combination of strength and elongation, have been widely used in aerospace, petrochemical rail transportation. However, a prevalent challenge advancing the utilization high-manganese steel is need for corresponding welding consumables. The deformation mechanism encompasses three primary mechanisms: martensitic phase transformation, twinning dislocation movement. stacking fault energy (SFE) critical factor determining dominant austenitic steels....
To study the therapeutic effect of Quyu (QY) Shengxin (SX) decoction (QYSXD) in mice with dextran sulfate sodium- (DSS-) induced ulcerative colitis and to investigate effects QYSXD on regulation receptor-interacting protein kinase 1 (RIP1)/receptor-interacting 3 (RIP3)/nucleotide-binding oligomerization domain-like receptor family pyrin domain (NLRP3) signaling pathway.Thirty-six were randomly divided into following 6 groups: experimental group (QYSX group), model (DSS positive control...
In the present paper, continuous-drive friction welding (CDFW) technology has been successfully applied to join U75V rail steel. The base metal (BM) of steel is lamellar pearlite, and weld zone could be clearly divided into three subzones (i.e., heat affected zone, thermo-mechanical (TMAZ), central (CWZ)). Electron back-scattered diffraction examinations revealed martensitic evolution in TMAZ CWZ, suggesting that experienced high temperature, severe plastic deformation, fast cooling rate...
The nature of the droplet size variation and its effect on process behaviour were investigated for short circuit CO 2 arc welding using a power supply with constant voltage output. To obtain images record current transient waveforms in phase, an integrated experimental system was established by combining high speed charge coupled device camera based laser shadowing related optical dual channel analog/digital converter. transfer mode is defined as maximum diameter molten just before...
The characteristics of short-circuit behaviour during the process self-shielded flux-cored arc welding and its corresponding electric information are investigated by a synchronous acquisition system high-speed images information. research results show that when between wire tip weld pool extinguishes, event occurs voltage is below ∼10 V, which can be used to judge occurrence procedure. Meanwhile, influence setting parameters on explored in detail. existence liquid slag increases difficulty...