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Acta Mathematica Sinica,English Series 2004年第3期20卷 569-576页

作者： yonghuali HalBinKAN BingJunYU DepartmentofMathematics SouthChinaNormalUniversityGuangzhou510631P.R.China DepartmentofComputer FudanUniversityShanghai200433P.R.China DepartmentofMathematics SichuanNormalUniversityChengdu610066P.R.China

In this paper, a special kind of partial algebras called projective partial groupoids is defined. It is proved that the inverse image of all projections of a fundamental weak regular *-semigroup under the homomorphism induced by the maximum idempotent-separating congruence of a weak regular *-semigroup has a projective partial groupoid structure. Moreover, a weak regular *-product which connects a fundamental weak regular *-semigroup with corresponding projective partial groupoid is defined and characterized. It is finally proved that every weak regular *-product is in fact a weak regular *-semigroup and any weak regular *-semigroup is constructed in this way.

关键词： Weak regular *-semigroup Projective partial groupoid Weak regular *-product

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Influence of Ti Powder Characteristics on Combustion Synthesis of Porous NiTi Alloy

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Journal of Materials Science & Technology 2002年第3期18卷 248-250页

作者： yonghuali V.E.Gunther 等 InstituteofMetalResearch ChineseAcademyofScienceskShenyang110016China ScientificResearchInstituteofMedicalMaterialsandShapeMemoryImplats Tomsk634034Russia

Porous NiTi shape memory alloy (SMA) is a novel biomedical material used for human hard tissue implant. The influence of elemental titanium powder characteristics such as powder morphology, particle size and specific surface area (SSA) on the minimal ignition temperature, combustion temperature and final product of porous NiTi SMA fabricated by combustion synthesis method was investigated in this paper by scanning electron microscopy (SEM) and laser diffraction. The preliminary data indicated that the titanium powder characteristics had a strong effect on combustion synthesis of porous NiTi SMA.

关键词： Porous NiTi shape memory alloy Combustion synthesis Titanium powder characteristics

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Quantitative Measurements of the Decentration Distance of Four Kinds of Intraocular Lens

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Eye Science 2004年第1期20卷 48-51页

作者： BoFeng ZhendeLin JianjingLi yonghuali ZhongshanOphthalmicCenter SunYat-senUniversityGuangzhou510060China

Purpose:To investigate a quantitative method to measure decentration distance(DD) and analyze the DD of four kinds of intraocular lenses (IOLs).Methods:The pseudophakic eye photos were taken under the slit lamp after the IOLs were implanted a year or longer. Then the images were inputted into a computer and the Photoshop software was applied to analyze the DD. Four kinds of IOLs were analyzed, including AcrySof MA60BM (11 eyes), Allergan SA40N (11 eyes), AcrySof SA60AT/SA30AL (5 eyes), Corneal Quattro (4 eyes).Results:The mean value of DD was (0.264 3±0.157 4)mm in the AcrySof MA60BM group,(0.353 6±0.171 9)mm in the Array SA40N group,(0.309 9±0.152 9)mm in the SA60AT/SA30AL group, and (0.326 1±0.187 7)mm in the Quattro group. The difference of the DD values among these 4 kinds of IOLs had no statistic significance (F=0.506,P=0.681) and the values were not equal to zero (t=10.508, P < 0.001).Conclusion:The Photoshop method is a simple and efficient way for DD analysis. The modern foldable posterior-chamber-IOLs have good centration performances when implanted into the capsular bags. Eye Science 2004;20:48-51.

关键词：定量测量法偏轴距离眼内镜眼科检查

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