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| 1 | Downward continuation of airborne geomagnetic data based on two iterative regularization methods in the frequency domain显示文摘Downward continuation is a key step in processing airborne geomagnetic data. However,downward continuation is a typically ill-posed problem because its computation is unstable; thus, regularization methods are needed to realize effective continuation. According to the Poisson integral plane approximate relationship between observation and continuation data, the computation formulae combined with the fast Fourier transform(FFT)algorithm are transformed to a frequency domain for accelerating the computational speed. The iterative Tikhonov regularization method and the iterative Landweber regularization method are used in this paper to overcome instability and improve the precision of the results. The availability of these two iterative regularization methods in the frequency domain is validated by simulated geomagnetic data, and the continuation results show good precision. | Liu Xiaogang Li Yingchun Xiao Yun Guan Bin | 2015 | Geodesy and Geodynamics2015，6，1： | 8 |
| 2 | Engineered Functional Surfaces by Laser Microprocessing for Biomedical Applications显示文摘Metallic biomaterials are increasingly being used in various medical applications due to their high strength,fracture resistance,good electrical conductivity,and biocompatibility.However,their practical applications have been largely limited due to poor surface performance.Laser microprocessing is an advanced method of enhancing the surface-related properties of biomaterials.This work demonstrates the capability of laser microprocessing for biomedical metallic materials including magnesium and titanium alloys,with potential applications in cell adhesion and liquid biopsy.We investigate laser-material interaction,microstructural evolution,and surface performance,and analyze cell behavior and the surface-enhanced Raman scattering(SERS)effect.Furthermore,we explore a theoretical study on the laser microprocessing of metallic alloys that shows interesting results with potential applications.The results show that cells exhibit good adhesion behavior at the surface of the laser-treated surface,with a preferential direction based on the textured structure.A significant SERS enhancement of 6×10^3 can be obtained at the laser-textured surface during Raman measurement. | Guoqing Hu Kai Guan Libin Lu Jiaru Zhang Nie Lu Yingchun Guan | 2018 | Engineering2018，4，6： | 5 |
| 3 | Theoretical fundamentals of short pulse laser–metal interaction: A review显示文摘Short and ultrashort pulse lasers offer excellent advantages in laser precision machining mainly because of their high pulse energy and low ablation threshold. The complex process of laser interaction with metals limits the indepth investigation into laser ablation. Numerical simulation is important in the study of fundamental mechanisms. This review explores the start-of-the-art methods for the theoretical simulation of the laser ablation of metals, including plasma formation and expansion. Laser-induced period surface structures are also studied. | Xinxin Li Yingchun Guan | 2020 | Nanotechnology and Precision Engineering2020，3，3： | 4 |
| 4 | Ultrafine microstructure development in laser polishing of selective laser melted Ti alloy显示文摘1.Introduction Titanium(Ti)alloys have been widely used in aerospace[1],biomedical industries[2],marine and offshore[3],due to their high yield strength,low density,good biocompatibility and outstanding corrosion resistance[4-6].Compared with traditional material processing methods,such as forging[7],stamping[8]and casting[9],additive manufacturing(AM)has attracted much attention to produce complex components close to their final prototypes with the formation of an ultrafine eutectoid microstructure caused by high cooling rates under multiple thermal cycles[2]. | Yuhang Li Xu Cheng Yingchun Guan | 2021 | Journal of Materials Science & Technology2021，，24： | 3 |
| 5 | A Simple Shear Model for the Asymmetry in the Paleoproterozoic Fold Belt in Liaodong Peninsula显示文摘Several aspects of the Liaodong Paleoproterozioc fold belt, including its components, tectonic, metamorphic and magmatic characteristics are discussed in the paper, with emphasis on the asymmetry of the fold belt and differences between the northern lineal-fold belt and the southern dome-fold belt. It is suggested that the fold belt is one magmatic passive margin, instead of a rift zone or the classical passive continental margin. The formation and evolution of the fold belt is dis- cussed with a simple shear model, which may best explain the co-existence of contemporaneous tectonic facies with different characteristics, the volcanic and plutonic activities, sedimentary formations and their geological attributes etc. | Cui Yingchun, Liu Junlai, Ma Lijie and Guan Huimei (Dept. Earth Sci., Jilin University, Changchun 130061 P.R. China) | 2001 | Global Geology2001，6，1： | 2 |
| 6 | Impact of Dynamic Mud Invasion onSwEstima-tion in Fresh Water Formations Sudan Blocks 1/2/4,Muglad Ba-sin显示文摘 | | 2001 | Petrophysics2001，42，3： | 1 |
| 7 | Remediation of petroleum-contaminated soil after composting by sequential treatment with Fenton-like oxidation and biodegradation显示文摘 | Mang Lu Zhongzhi Zhang Wei Qiao Xiaofang Wei Yueming Guan Qingxia Ma Yingchun Guan | 2009 | Bioresource Technology2009，，7： | 1 |
| 8 | Tailoring metallic surface properties induced by laser surface processing for industrial applications显示文摘As a simple, reproducible, and pollution-free technique with the potential of integration and automation, laser processing has attracted increasing attention. Laser processing, which includes laser polishing, laser cleaning,and fabrication of laser-induced micro-/nano-structures, has been demonstrated to yield smooth, clean, functional surfaces and effective joining. Laser polishing is an advanced, highly efficient, and ecofriendly polishing technology. This study demonstrated the laser polishing of a selective laser-melted Inconel 718(IN718) superalloy and a titanium alloy sample. The surface roughnesses Raand Rzof the IN718 superalloy were respectively reduced from 8 and 33 μm to 0.2 and 0.8 μm, and the Raof the titanium alloy was reduced from 9.8 μm to 0.2 μm.Moreover, the wear resistance and corrosion resistance of the IN718 were apparently improved. As another surface-related processing method, laser cleaning was used to clean terminal blocks. Almost all the contaminants were removed, as verified by the absence of their chemical compositions and the decreased surface roughness. In addition, a superhydrophobic surface with a contact angle of over 160° and sliding angle of b8° on stainless steel was obtained by laser texturing treatment. These results demonstrate the high potential of laser processing in the scientific, technological, and industrial fields. | Guoqing Hu Yang Song Yingchun Guan | 2019 | Nanotechnology and Precision Engineering2019，2，1： | 1 |
| 9 | Impact of dynamic mud invasion on Sw estimation in fresh water formations Sudan Blocks 1/2/4,Muglad Basin显示文摘 | Yingchun Guan | 2001 | Petrophysics2001，42，3： | 1 |
| 10 | Impact of dynamic mud invasion on Sw estimation in fresh water formations,Sudan Blocks 1/2/4,Muglad Basin显示文摘 | Guan Yingchun | 2001 | Petrophysics2001，42，3： | 1 |
| 11 | Evaluation of Mechanical Properties of Cross-Laminated Timber with Different Lay-ups Using Japanese Larch显示文摘Japanese larch is one of the main plantation tree species in China.A lack of engineered wood products made by Japanese larch,however,limits its application in wood stnuctures.In this study,based on optimum process parameters,such as pressure(12 MPa),adhesive spread rate(200 g/m^(2))and adhesive(one-component polyurethane),the mechanical properties of Japanese larch-made cross-laminated timber(CLT)with different lay-ups were evaluated by means of the static method.Results of this study showed that variations in lay-ups significantly affected the mechanical properties of CLT.The strength and modulus of bending and parallel compression for CLT increased with the thickness of lumber,while that of bending,parallel compression and rolling shear all decreased with the number of layers.Thickness,layup orientation and the number of layers all had an impact on the strength of CLT.Failure modes obtained from numerical simulation were basically the same as those of experimental tests.There was also strong alignment between theoretical value and test value for effective bending stifness and shear stifness.Thus,the shear analogy method can be used to predict the mechanical properties of CLT effectively.This study proved great potential in using Japanese larch wood for manufacturing CLT due to its good mechanical properties. | Yingchun Gong Fenglu Liu Zhaopeng Tian Guofang Wu Haiqing Ren Cheng Guan | 2019 | Journal of Renewable Materials2019，7，10： | 1 |
| 12 | On the spontaneous encapsulation of proteins in carbon nanotubes 显示文摘 | YU KANG YINGCHUN LIU QI WANG JIAWEI SHEN TAO WU WENJUN GUAN | 2009 | Biomaterials2009，30，14： | 1 |
| 13 | A Laser Scanner-Stage Synchronized System Supporting the Large-Area Precision Polishing of Additive-Manufactured Metallic Surfaces显示文摘This paper proposes a scanner–stage synchronized approach emphasizing a novel control structure for the laser polishing of Inconel 718 components manufactured by selective laser melting in order to address increasing demands for high surface quality in metal additive manufacturing.The proposed synchronized control system is composed of a motion decomposition module and an error synthesis module.The experimental results show that stitching errors can be avoided thanks to continuous motion during laser processing.Moreover,in comparison with the existing step-scan method,the processing efficiency of the proposed method is improved by 38.22%and the surface quality of the laser-polished area is significantly enhanced due to a more homogeneous distribution of the laser energy during the material phase change.The proposed synchronized system paves the way for high-speed,high-precision,and large-area laser material processing without stitching errors. | Mengjia Cui Libin Lu Zhen Zhang Yingchun Guan | 2021 | Engineering2021，7，12： | 0 |
| 14 | A beam flexure-based nanopositioning stage supporting laser direct-write nanofabrication显示文摘A nanopositioning system of both millimetric stroke and nanometric tracking accuracy is a key component for nanofabrication in many applications. In this paper, a novel bi-axial beam-flexure nano servo stage is proposed to support a direct writing system for femtosecond laser nanofabrication. The important features of the stage lie in: a mirror symmetric instead of rotational symmetric configuration is adopted to restrict cross axis coupling, and a novel Z-shaped guidance module is proposed to achieve relative large linear stiffness range, in addition a redundant constraints module is introduced to increase off-axis stiffness of the stage. Mechanical analysis and system identification are provided, with which a feedback control algorithm demonstrates the tracking capability for laser fabrication purposes. Based on the fabricated XY nano-stage, real time control and measurements are deployed, demonstrating the millimetric operating workspace and 77.8 nm(RMS) error of tracking a circular trajectory. | Zhen Zhang Peng Wang Peng Yan YingChun Guan | 2016 | Science China(Physics,Mechanics & Astronomy)2016，59，8： | 0 |
| 15 | Interfacial Features of Stainless Steel/Titanium Alloy Multi-metal Fabricated by Laser Additive Manufacturing显示文摘Laser additive manufacturing(LAM)is promising for fabricating multi-metallic component,but the mechanism of microstructural evolution at the interface of two metals is still needed to research further.In this study,a 316L stainless steel/Ti6Al4V alloy multi-metal was fabricated by LAM,and the mechanism of intermetallic phase transformation was deeply investigated.Results show that a strong reaction zone(SRZ)can be induced at the interface of the multi-metal.The phase constituents at the SRZ vary fromχ(Ti_(5)Fe_(17)Cr_(5))+Fe_(2)Ti+α′-Ti+β-Ti or FeTi to Fe_(2)Ti+χwhen the laser power is increased.When the scanning speed is further decreased,the thickness of the SRZ is significantly increased,andα′-Ti phase is also formed at this region besides Fe_(2)Ti andχphases.Moreover,the micro-hardness at the SRZ is increased,caused by the intermetallic phase transformation and elemental interdiffusion at the interface. | Jialin Yang Xing Li Hanbo Yao Yingchun Guan | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，8： | 0 |
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