| 1 | The Measurement of ^(41)Ca and Its Application for Cell Messenger显示文摘Ca is an important element in human body. Many diseases relate with Ca in organizations and cells.41Ca (T1/2=1.04×105 a, pure electron capture with emission or Auger electrons and X-rays) is an idealtracer to understand of the mechanism of the disease. The measurement of 41Ca with AMS has been usedfor study of long-term bone resorption, bone resorption in a human, Ca uptake and deposition in heardtissue and skeletal Ca metabolism. Ca2+ in cytoplasm of human cell as a cell messenger plays an | S. JIANG, M. HE, K. DONG, D. YUE, S. WU, G.XU, J.QIN, Q.YOU, Y.ZHENG, Y.GUAN, Q. LIANG, X. ZHAO, Q. WANG S. LIU(Department of Nuclear Physics, C1AE, Beijing 102413, China Department of biology, Beijing Normal University, Beijing 100875, China Department of Physics, Guangxi University, Nanning 530004, China College of Public Health, Beijing University, Beijing 100083, China College of Applied Arts and Science, Beijing Union University, Beijing 100083, China) | 2002 | Annual Report of China Institute of Atomic Energy2002，，0： | 12 |
| 2 | Population-Based and Personalized Design of Total Knee Replacement Prosthesis for Additive Manufacturing Based on Chinese Anthropometric Data显示文摘At present,most total knee replacement(TKR)prostheses on the market are designed according to the sizes of Caucasians.However,extensive studies have indicated that human anatomies differ among different ethnicities.A number of reports have indicated that Chinese TKR patients do not match with available prostheses.In this study,computed tomography(CT)images of 52 knees of Chinese men and women were used for anthropometric measurements.Index and geometric measurements were definedand used for correlation analysis.Key parameters from the measurement results were identified.Detailed geometries of knees were measured as coordinates.A deformable three-dimensional(3D)knee modelbased on anatomical coordinates correlating with the identified key parameters was generated.A pros-thesis was then designed according to the analyzed results.Surface matching analysis,bone resectionanalysis,and cadaveric trials were conducted and compared with commercial products to validate theproposed design.The femoral component designed by this study resulted in the highest accuracy(rootmean square point-to-surface(RMS PS),(1.08±0.20)mm)and lowest amount of resected bone volume(27412mm^(3))in comparison with two commercial knee prostheses.This study suggests a new approachfor population-based patient-specific femoral prosthesis design With a single,easilty acquired dimen-sion-namely,epicondyle width(ECW)-as input,a patient-specific femoral prosthesis can be designed according to the analyzed measured data and manufactured by additive manufacturing(AM)methods.Meanwhile,the reconstructed femoral condylar surface was compared with the femoral condylar surfacein the original CT scanning data The average RMS PS distance of the reconstructed femoral condylar surface among all data was(1.10±0.18)mm,which is comparable to other statistical shape modeling methods using multiple radiographs as input data.There is a need to develop an anthropometric-based knee prosthesis for the Chinese population.Based on the anthropometry of the Chinese population,our new design fits Chinese patients better and reserves more bone volume compared with current commercial prostheses,which is an essential step toward AM for personalized knee prostheses. | C.S.Chui K.S.Leung J.Qin D.Shi P.Augat R.M.Y.Wong S.K.H.Chow X.Y.Huang C.Y.Chen Y.X.Lai P.S.H.Yung L.Qin W.H.Cheung | 2021 | Engineering2021，7，3： | 1 |
| 9 | Formation of intermetallic phases in unrefined and refined AA6082 Al alloys investigated by using SEM-based ultramicrotomy tomography显示文摘The spatial arrangement,distribution and morphology of Fe-bearing intermetallics in AA6082 alloys depends on the manufacturing process of the alloy and thus influences the macroscopic properties.Here,the microstructure of a near industrial scale casting AA6082 Al alloy fabricated by:(a)direct chill casting,(b)Al-5 Ti-1 B grain refiner addition and(c)intensive melt shearing has been investigated by threedimensional visualization using SEM-based serial ultra microtomy tomography.The formation sequence of phases in AA6082 alloys is generally categorized into four stages:formation ofα-Al grains,Fe-bearing intermetallics,Mg_(2)Si phase,and eutectic rosettes.Results of three-dimensional visualization of the microstructure indicated that TiBparticles not only could nucleate Fe-bearingβ-intermetallics,but also could provide substrate for the formation of Fe-bearingα-intermetallics and Mg_(2)Si.A further deep analysis reveals that the essential condition for the formation of secondary phases such as Fe-bearing intermetallics and Mg_(2)Si phase is the build-up of a supersaturated solute front at theα-Al solid-liquid interface irrespective of the specific nucleation site.In addition,the results indicate that grain refinement processing causes the severe interconnectivity of Fe-bearingα-intermetallics.However,the intensive melt shearing is a better manufacturing process because the intermetallics are more evenly distributed and refined than with the addition of the grain refiner,thereby improving the properties of the alloy. | J.M.Yu T.Hashimoto H.T.Li N.Wanderka Z.Zhang C.Cai X.L.Zhong J.Qin Q.P.Dong H.Nagaumi X.N.Wang | 2022 | Journal of Materials Science & Technology2022，，25： | 0 |
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