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Printability disparities in heterogeneous material combinations via laser directed energy deposition:a comparative study

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International Journal of Extreme Manufacturing 2024年第2期6卷 389-405页

作者： jinsheng ning Lida Zhu Shuhao Wang Zhichao Yang Peihua Xu Pengsheng Xue Hao Lu Miao Yu Yunhang Zhao Jiachen Li Susmita Bose Amit Bandyopadhyay School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819People’s Republic of China School of Machinery and Automation Wuhan University of Science and TechnologyWuhan 430081People’s Republic of China School of Mechanical Engineering Xi’an University of Science and TechnologyXi’an 710054People’s Republic of China Beijing Institute of Space Launch Technology Beijing 100076People’s Republic of China W.M.Keck Biomedical Materials Research Lab School of Mechanical and Materials EngineeringWashington State UniversityPullmanWA 99164United States of America

Additive manufacturing provides achievability for the fabrication of bimetallic and multi-material structures;however,the material compatibility and bondability directly affect the parts’formability and final *** is essential to understand the underlying printability of different material combinations based on an adapted ***,the printability disparities of two common and attractive material combinations(nickel-and iron-based alloys)are evaluated at the macro and micro levels via laser directed energy deposition(DED).The deposition processes were captured using in situ high-speed imaging,and the dissimilarities in melt pool features and track morphology were quantitatively investigated within specific process ***,the microstructure diversity of the tracks and blocks processed with varied material pairs was comparatively elaborated and,complemented with the informative multi-physics modeling,the presented non-uniformity in mechanical properties(microhardness)among the heterogeneous material pairs was *** differences in melt flow induced by the unlike thermophysical properties of the material pairs and the resulting element intermixing and localized re-alloying during solidification dominate the presented dissimilarity in printability among the material *** work provides an in-depth understanding of the phenomenological differences in the deposition of dissimilar materials and aims to guide more reliable DED forming of bimetallic parts.

关键词： directed energy deposition printability microstructure microhardness bimetallic parts

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Spectral Representation and Analysis of the KBR Precision Based on the Earth Gravity Spectrum

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Geo-Spatial Information Science 2005年第3期8卷 205-208,219页

作者： LUO Jia ning jinsheng LUO Zhicai School of Geodesy and Geomaties Wuhan University

Satellite-to-Satellite Tracking in low-low model （SST-Ⅱ） is a new technique to resolve the series of problems met in the determination of the earth＇s gravity field. As the key technique of SST-Ⅱ, KBR can get SST-Ⅱ measurements directly. So the KBR performance analysis is the first step in SST-Ⅱ design. In this paper, assuming that the satellite pairs of SST-Ⅱ are in near circle polar orbits, the spectrum relationship between the earth gravity field and KBR is established using analytic method. And then some examples are analyzed, the suggestions and conclusions are drawn from these examples. The research results could be taken as a reference for future satellite gravity project of China.

关键词： SST-Ⅱ KBR earth gravity field spectrum

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Detection of unsymmetrical global tectonic change by using space geodetic data

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Chinese Science Bulletin 2000年第7期45卷 639-643页

作者： SUN Fuping ZHAO Ming ning jinsheng CHAO Dingbo Zhengzhou Institute of Surveying and Mapping Zhengzhou 450052China Shanghai Observatory Chinese Academy of SciencesShanghai 200030China Wuhan Technical University of Surveying and Mapping Wuhan 430070China

The global tectonic change deduced from geophysical research was first identified by space geodetic data from VLBI, GPS and SLR measurements. whether using geodesic rates or using vertical velocities of stations, three kinds of data and their integration give consistent results: within the mid-latitude belt on the Northern Hemisphere there may be about 8 - 10 mm/a contracting change; within the mid-latitude belt on the Southern Hemisphere there may be about 12-14 mm/a expanding change. This result not only validates the reverse global tectonic change in the Southern and Northern Hemispheres of the Earth, but also gives relatively precise quantative estimations.

关键词： space geodesy measuring site velocities global tectonic change.

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APPLICATION OF THE HARTLEY TRANSFORM IN THE COMPUTATION OF THE GEOID IN CHINA

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Geo-Spatial Information Science 1998年第1期1卷 43-49页

作者： ning jinsheng[a] LI Jiancheng CHAO Dingbo [a] School of Geo-science and Surveying Engineering WTUSM Wuhan China 430079

This paper presents a method for the computation of the Stokes for-mula using the Fast Hartley Transform（FHT）*** algorithm is mostsuitable for the computation of real sequence transform,while the Fast FourierTransform（FFT）techniques are more suitable for the computaton of complex se-quence transform.A method of spherical coordinate transformation is presented inthis *** this method the errors,which are due to the approximate term inthe convolution of Stokes formula,can be effectively *** numericaltests are *** a comparison with both FFT techniques and numerical integra-tion method,the results show that the resulting values of geoidal undulations byFHT techniques are almost the same as by FFT techniques,and the computation-al speed of FHT techniques is about two times faster than that of FFT techniques.

关键词： FHT FFT numerical integration

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The crystallographic texture and dependent mechanical properties of the CrCoNi medium-entropy alloy by laser remelting strategy

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Journal of Materials Science & Technology 2022年第16期111卷 245-255页

作者： Pengsheng Xue Lida Zhu jinsheng ning Peihua Xu Shuhao Wang Zhichao Yang Yuan Ren Guiru Meng School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Laser remelting(LR)has attracted widespread attention in recent years as an effective method to reduce internal defects and improve the surface quality of additively manufactured(AM)*** the present study,three different LR inter-layer scanning strategies(LR0,LR90 and LR45)and their effects on the porosity,microstructure,crystallographic texture and related mechanical properties of parts have been *** microscope,X-ray diffraction,and scanning electron microscope were used as characterization *** the LR90 sample,it shows obvious{111}texture and strongpreferred orientation along the scanning direction(SD),while the 0°offset and the 45°rotation of LR scanning strategy form a finer microstructure and weak crystallographic ***,the mechanical properties of the LR sample are improved compared with the sample only by laser metal deposition(LMD),and a combination of higher strength and optimal uniform elongation is obtained in the LR45 *** overall results show that a reasonable LR scanning strategy can reduce the anisotropy of AM parts and improve their mechanical properties.

关键词： CrCoNi Laser remelting Porosity Crystallographic orientation Mechanical properties

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测绘科学与技术转型升级发展战略研究

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武汉大学学报（信息科学版） 2019年第1期44卷 1-9页

作者：宁津生武汉大学地球空间环境与大地测量教育部重点实验室武汉大学测绘学院

讨论了当今经济社会发展中信息化、全球化新形势下测绘科学与技术转型升级发展总体战略,重点分析了这种背景下测绘科学与技术转型升级发展的国家需求与必要性,明确转型升级发展的战略地位与内涵,研究转型升级的科技创新体系,探讨转型升... 详细信息

讨论了当今经济社会发展中信息化、全球化新形势下测绘科学与技术转型升级发展总体战略,重点分析了这种背景下测绘科学与技术转型升级发展的国家需求与必要性,明确转型升级发展的战略地位与内涵,研究转型升级的科技创新体系,探讨转型升级后测绘科学与技术在社会发展与国家安全保障中的应用与服务,提出和构建转型升级的学科建制、人才培养模式和研究平台,提出重点发展方向、趋势和策略,为实现测绘科学与技术全面转型升级发展提供参考。

关键词：测绘科学与技术转型升级互联网+ 地理信息产业

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Applications of the Fictitious Compress Recovery Approach in Physical Geodesy

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Geo-Spatial Information Science 2008年第3期11卷 162-167页

作者： SHEN Wenbin LI Jiancheng LI Jin ning jinsheng CHAO Dingbo SHEN Wenbin School of Geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan 430079 China The Key Laboratory of Geospace Environment and Geodesy Wuhan University 129 Luoyu Road Wuhan 430079 China.

The fictitious compress recovery approach is introduced, which could be applied to the establishment of the Rungerarup theorem, the determination of the Bjerhammar＇s fictitious gravity anomaly, the solution of the ＂downward con- tinuation＂ problem of the gravity field, the confirmation of the convergence of the spherical harmonic expansion series of the Earth＇s potential field, and the gravity field determination in three cases： gravitational potential case, gravitation case, and gravitational gradient case. Several tests using simulation experiments show that the fictitious compress recovery approach shows promise in physical geodesy applications.

关键词： fictitious compress recovery physical geodesy gravity field: determination

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SATELLITE GRAVITY SURVEYING TECHNOLOGY AND RESEARCH OF EARTH’S GRAVITY FIELD

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大地测量与地球动力学 2003年第B12期23卷 1-7页

作者： ning jinsheng (The Key Laboratory of Geo Space Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China) The Key Laboratory of Geo-Space Environment and Geodesy Ministry of EducationWuhan University Wuhan 430079 China

This is a summarized paper. Two topics are discussed: Firstly, the concept, development and application of four kinds of satellite gravity surveying technology are introduced; Secondly, some problems of theory and method, which must be considered in the study of the \{Earth’s\} gravity field based on satellite gravity data, are expounded.

关键词：卫星重力测量技术地球重力场卫星轨道技术概念技术进展技术应用空中重力测量

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Study on Recovering the Earth＇s Potential Field Based on GOCE Gradiometry

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Geo-Spatial Information Science 2008年第4期11卷 273-278页

作者： SHEN Wenbin LI Jin LI Jiancheng WANG Zhengtao ning jinsheng CHAO Dingbo Dept. of Geophysics School of Geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan 430079 China

Given the second radial derivative Vrr（P）｜δs of the Earth＇s gravitational potential V（P） on the surface δS corresponding to the satellite altitude, by using the fictitious compress recovery method, a fictitious regular harmonic field rrVrr（P）^＊ and a fictitious second radial gradient field V：（P） in the domain outside an inner sphere Ki can be determined, which coincides with the real field V（P） in the domain outside the Earth. Vrr^＊（P）could be further expressed as a uniformly convergent expansion series in the domain outside the inner sphere, because rrV（P）^＊ could be expressed as a uniformly convergent spherical harmonic expansion series due to its regularity and harmony in that domain. In another aspect, the fictitious field V^＊（P） defined in the domain outside the inner sphere, which coincides with the real field V（P） in the domain outside the Earth, could be also expressed as a spherical harmonic expansion series. Then, the harmonic coefficients contained in the series expressing V^＊（P） can be determined, and consequently the real field V（P） is recovered. Preliminary simulation calculations show that the second radial gradient field Vrr（P） could be recovered based only on the second radial derivative V（P）｜δs given on the satellite boundary. Concerning the final recovery of the potential field V（P） based only on the boundary value Vrr （P）｜δs, the simulation tests are still in process.

关键词： GOCE gradiometry second radial gradients second radial gradient field recovery potential field recovery

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Application status and prospect of ionic liquids in oilfield chemistry

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Petroleum 2024年第1期10卷 11-18页

作者： jinsheng Sun Zhuoyang Xiu Li Li Kaihe Lv Xianfa Zhang Zonglun Wang Zhiwen Dai Zhe Xu ning Huang Jingping Liu School of Petroleum Engineering China University of Petroleum (East China) CNPC Engineering Technology R&D Company Limited Oil & Gas Technology Research Institute of Changqing Oilfield Company

The ionic liquid, as a new treatment agent, has been increasingly applied in oil fields due to its strong temperature resistance, good solubility and high surface activity. In this paper, we systematically discuss the action mechanism and application effect of ionic liquids in oilfield chemistry. Ionic liquids can inhibit shale hydration expansion and reduce fluid loss through adsorption and intercalation, inhibit the formation of natural gas hydrate through imidazole five-membered ring structure as a space barrier, reduce viscosity of heavy oil by breaking chemical bonds of heavy oil macromolecules and charge transfer,improve oil displacement efficiency by forming ions pairs with carboxyl groups in crude oil, demulsify by forming channels between dispersed water droplets, acidify the formation by reacting with water to produce acid, interacts with organic material through weak hydrogen bonds and extracts it from oilfield wastewater, desulphurize by inserting sulfide molecules into the “stack” structure and form liquid inclusion complex, inhibit corrosion by forming a protective film on the metal surface. Based on the above aspects, the development direction of ionic liquids is proposed. The application of ionic liquids in oilfield chemistry is still in its infancy. It is urgent to fully explore the application performance of ionic liquids in oilfield chemistry, which also provides theoretical and technical supports for efficient reservoir development.

关键词： Ionic liquids Oilfield chemistry Shale inhibitor Drilling fluid

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