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Laser Powder Bed Fusion of Beta-Type Titanium Alloys for Biomedical Application:A Review

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 17-28页

作者： xuan luo Chao Yang Dongdong Li Lai-Chang Zhang State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou510640China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

Additive manufacturing ofβ-type titanium alloy is expected to replace Ti-6Al-4V alloy in the field of orthopedic implantation because of their low elastic modulus,excellent corrosion resistance,and *** briefly introducing the laser powder bed fusion(LPBF)process and physical phenomena,this paper reviews the recent progresses in LPBF-edβ-type Ti *** strategies to strengthening and tougheningβ-type Ti alloys are critically *** is followed by the processing routes employed to achieve to low modulus for orthopedic applications,especially a new methodology for tailoring crystallographic orientation called multi-track coupled directional *** effect of processing and compositions on performance metrics ofβ-type Ti alloys included corrosion behavior,and biocompatibility is *** the end,challenges in additive manufacturing ofβ-type Ti alloys in future are highlighted,with the aim to ensue clinical application of LPBF-edβ-type Ti alloys.

关键词： β-type Ti alloys Laser powder bed fusion Mechanical properties Elastic modulus Biocompatibility

SYNTHESIS AND PROPERTIES OF NOVEL POLY(IMINO KETONE)S AS HIGH-PERFORMANCE POLYMERS

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Chinese Journal of Polymer Science 2008年第1期26卷 55-61页

作者： Chang, Guan-jun luo, xuan Zhang, Lin Lin, Run-xiong Qingdao Univ Sci & Technol Minist Educ Key Lab Rubber Plast Qingdao 266042 Peoples R China China Acad Engn Phys Mianyang 621900 Peoples R China

Di(4-bromophenyl)ketone and various aromatic diamines as the monomers,a series of novel poly(imino ketone)s (PIKs)have been synthesized via palladium-catalyzed aryl amination,which is Hartwig-Buchwald polycondensation *** structures of PIKs are characterized by means of elemental analysis,FT-IR,~1H-NMR and UV-Vis spectroscopy. The results show a good agreement with the proposed *** general properties of PIKs are studied by DSC,TG and wide-angle X-ray diffraction,the solubility behavior is...

关键词： Di(4-bromophenyl)ketone Aromatic diamines Palladium-catalyzed aryl amination High-performance Poly(imino ketone)

ARAP++:an extension of the local/global approach to mesh parameterization

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Frontiers of Information Technology & Electronic Engineering 2016年第6期17卷 501-515页

作者： Zhao WANG Zhong-xuan luo Jie-lin ZHANG Emil SAUCAN School of Mathematical Sciences Dalian University of TechnologyDalian 116024China School of Software Dalian University of TechnologyDalian 116620China Max Planck Institute for Mathematics in the Sciences Leipzig 70569Germany

Mesh parameterization is one of the fundamental operations in computer graphics(CG) and computeraided design(CAD). In this paper, we propose a novel local/global parameterization approach, ARAP++, for singleand multi-boundary triangular meshes. It is an extension of the as-rigid-as-possible(ARAP) approach, which stitches together 1-ring patches instead of individual triangles. To optimize the spring energy, we introduce a linear iterative scheme which employs convex combination weights and a fitting Jacobian matrix corresponding to a prescribed family of transformations. Our algorithm is simple, efficient, and robust. The geometric properties(angle and area)of the original model can also be preserved by appropriately prescribing the singular values of the fitting matrix. To reduce the area and stretch distortions for high-curvature models, a stretch operator is introduced. Numerical results demonstrate that ARAP++ outperforms several state-of-the-art methods in terms of controlling the distortions of angle, area, and stretch. Furthermore, it achieves a better visualization performance for several applications, such as texture mapping and surface remeshing.

关键词： Mesh parameterization Convex combination weights Stretch operator Jacobian matrix

Numerical realization of the conditions of Max Nther's residual intersection theorem

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Applied Mathematics(A Journal of Chinese Universities) 2014年第4期29卷 481-502页

作者： luo Zhong-xuan FENG Er-bao ZHANG Jie-lin School of Software Dalian University of Technology School of Mathematical Sciences Dalian University of Technology

The aim of this paper is to study numerical realization of the conditions of Max Nother＇s residual intersection theorem. The numerical realization relies on obtaining the inter- section of two algebraic curves by homotopy continuation method, computing the approximate places of an algebraic curve, getting the exact orders of a polynomial at the places, and determin- ing the multiplicity and character of a point of an algebraic curve. The numerical experiments show that our method is accurate, effective and robust without using multiprecision arithmetic, even if the coefficients of algebraic curves are inexact. We also conclude that the computational complexity of the numerical realization is polynomial time.

关键词： algebraic curve Puiseux expansion place homotopy continuation multiple root.

Eu(Ⅲ) complex-doped PMMA having fast radiation rate and high emission quantum efficiency

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Chinese Chemical Letters 2012年第8期23卷 945-948页

作者： Jin Li Zhang Bo Wei Chen xuan luo Kai Du Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900China School of Physics and Electronic Engineering Mianyang Normal UniversityMianyang 621000China

Three Eu（III） ternary complexes, Eu（hfa-H）3（Phen）, Eu（hfa-H）3（Bipy） and Eu（hfa-H）3（Bath）（hfa = hexafluoroacetylacetonate, Phen = 1,10-phenanthroline, Bipy = 2,2＇-bipyridine, Bath = bathophenanthroline）, were synthesized. Their luminescent properties were studied by incorporating deuterated Eu（III） complexes in a poly（methylmethacrylate）（PMMA） matrix, and the results indicated that luminescent PMMA including Eu（hfa-D）3（Bath） showed promising results for applications to novel organic Eu（III） devices, such as the high-power laser materials. Additionally, all the three Eu（III） complexes exhibited good thermostabilization.

关键词： Photolunainescence Eu(III) complex Rare earths

Eu(Ⅲ) Complex-doped PMMA with Fast Radiation Rate and High Emission Quantum Efficiency

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Chemical Research in Chinese Universities 2012年第6期28卷 1054-1057页

作者： ZHANG Jin-li CHEN Bo-wei luo xuan DU Kai Research Center of Laser Fusion China Academy of Engineering Physics Mianyang 621900 P. R. China School of Physics and Electronic Engineering Mianyang Normal University Mianyang 621000 P. R. China

Two Eu（Ⅲ） complexes,（tris-4,4,4-trifluoro-1-phenyl-1,3-butanedione）（1,10-phenanthroline）europium（Ⅲ） [Eu（tpb-H） 3（phen）] and（tris-4,4,4-trifluoro-1-phenyl-1,3-butanedione）（2,2＇-bipyridine）europium（Ⅲ）[Eu（tpb-H） 3（bipy）] were synthesized from bi-dental oxygen and nitrogen *** polymers were fabricated by incorporating deuterated Eu（Ⅲ） complexes in poly（methylmethacrylate）（PMMA） *** PMMA containing Eu（tpb-D） 3（phen） exhibited relatively higher quantum yield[Φ,（48.7±4）%],faster radiation rate（k r,7.49×10 2 s-1）,sharper red emission[full width at half maximum（FWHM）,6.3 nm] and larger stimulated emission cross-section（SEC,1.29×10-20 cm 2）.The value of SEC is the same order as that of Nd-glass laser for practical ***,the thermal properties of Eu（tpb-H） 3（phen）,Eu（tpb-H） 3（bipy）,Eu（tpb-D） 3（phen）-PMMA,and Eu（tpb-H） 3（bipy）PMMA were studied,indicating that the Eu（Ⅲ） complexes and luminescent PMMA can be used for a long-term period in high temperature *** luminescent polymers including Eu（tpb-D） 3（phen） have promising applications in novel organic Eu（Ⅲ） devices,such as the high-power laser materials and optical fibers.

关键词： Photophysics Fluorescence Rare earth

Mechanically activated starch magnetic microspheres for Cd(Ⅱ)adsorption from aqueous solution

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Chinese Journal of Chemical Engineering 2021年第5期34卷 40-49页

作者： Xinling Xie Xiaona Zhao xuan luo Tongming Su Youquan Zhang Zuzeng Qin Hongbing Ji School of Chemistry and Chemical Engineering Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification TechnologyGuangxi UniversityNanning 530004China Fine Chemical Industry Research Institute School of ChemistrySun Yat-sen UniversityGuangzhou 510275China

Magnetic starch microspheres(AAM-MSM)were synthesized via an inverse emulsion graft copolymerization by using mechanically activated cassava starch(MS)as a crude material,acrylic acid(AA)and acrylamide(AM)as graft copolymer monomers,and methyl methacrylate(MMA)as the dispersing agent and used as an adsorbent for the removal of Cd(Ⅱ)ions from aqueous ***-transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),and vibrating sample magnetometry(VSM)were used to characterize the AAM-MSM *** results indicated that AA,AM,and MMA were grafted to the MS,and the Fe_(3)O_(4) nanoparticles were encapsulated in the AAM-MSM adsorbent *** adsorbent exhibited a smooth surface,uniform size,and good sphericity because of the addition of the MMA and provided more adsorption sites for the Cd(Ⅱ)*** maximum adsorption capacity of Cd(Ⅱ)on the AAM-MSM was 39.98 mg·g^(-1).The adsorbents were superparamagnetic,and the saturation magnetization was 16.7 A·m^(2)·kg^(-1).Additionally,the adsorption isotherms and kinetics of the adsorption process were further *** process of Cd(Ⅱ)ions adsorbed onto the AAM-MSM could be described more favorably by the pseudo-second-order kinetic and Langmuir isothermal adsorption models,which suggested that the chemical reaction process dominated the adsorption process for the Cd(Ⅱ)and chemisorption was the rate-controlling step during the Cd(Ⅱ)removal process.

关键词： Mechanical activation Magnetic starch microspheres Cadmium ion Adsorption Separation Model

Quadratic nonconforming finite element method for 3D Stokes equations on cuboid meshes

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Applied Mathematics(A Journal of Chinese Universities) 2016年第1期31卷 21-36页

作者： ZHOU Xin-chen MENG Zhao-liang WANG Xiao-shan luo Zhong-xuan School of Mathematical Sciences Dalian University of TechnologyDalian 116024China School of Software Dalian University of TechnologyDalian 116024China

In this paper, the quadratic nonconforming brick element （MSLK element） intro- duced in [10] is used for the 3D Stokes equations. The instability for the mixed element pair MSLK-P1 is analyzed, where the vector-valued MSLK element approximates the velocity and the piecewise P1 element approximates the pressure. As a cure, we adopt the piecewise P1 macroelement to discretize the pressure instead of the standard piecewise P1 element on cuboid meshes. This new pair is stable and the optimal error estimate is achieved. Numerical examples verify our theoretical analysis.

关键词： Stokes equations nonconforming finite element macroelement stability.

Endoplasmic reticulum stress-induced apoptosis in intestinal epithelial cells:a feed-back regulation by mechanistic target of rapamycin complex 1(mTORC1)

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Journal of Animal Science and Biotechnology 2018年第3期9卷 607-617页

作者： Yun Ji xuan luo Ying Yang Zhaolai Dai Guoyao Wu Zhenlong Wu State Key Laboratory of Animal Nutrition Department of Animal Nutrition and Feed Science China Agricultural University Department of Animal Science Texas A&M University College Station

Background: Endoplasmic reticulum(ER) stress is associated with multiple pathological processes of intestinal diseases. Despite a critical role of mechanistic target of rapamycin complex 1(m TORC1) in regulating cellular stress response, the crosstalk between m TORC1 and ER stress signaling and its contribution to the intestinal barrier function is ***: In the present study, we showed that intestinal epithelial cells(IEC-6) incubated with tunicamycin led to caspase-3-dependent apoptotic cell death. The induction of cell death was accompanied by activation of unfolded protein response as evidenced by increased protein levels for Bi P, p-IRE1α, p-e IF2α, p-JNK, and CHOP. Further study demonstrated that tunicamycin-induced cell death was enhanced by rapamycin, a specific inhibitor of m ***, tunicamycin decreased transepithelial electrical resistance(TEER) and increased permeability of the cells. These effects of tunicamycin were exacerbated by m TORC1 ***: Taken together, the data presented here identified a previously unknown crosstalk between an unfold protein response and m TORC1 signaling in the intestinal epithelium. This feed-back loop regulation on ER stress signaling by m TORC1 is critical for cell survival and intestinal permeability in epithelial cells.

关键词： Apoptosis Barrier function ER stress Intestinal epithelial cell mTORC1