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建立了用高效液相色谱法测定地胆草中绿原酸含量。选择Agilent TC-C18色谱柱(250 mm×4.6 mm,5μm),甲醇-0.1%磷酸溶液(20∶80)为流动相,流速1.0 mL/min,检测波长328 nm,进样量10μL。结果表明,绿原酸0.044 9~4.488 0μg范围内线性关系良好(r=0.999 9),平均加样回收率为99.63%,RSD为0.61%(n=9)。所用方法专属性强、快速准确,可作为地胆草中绿原酸含量的测定方法。 相似文献
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本文推广Vogt定理到广义n-赋范空间,即证明了两个广义n-赋范空间之间的保持ρ-诱导距离映射是仿射的. 相似文献
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马玉梅 《数学物理学报(B辑英文版)》1992,(4)
It is extended that DARYL TINGLEY's results about that isometries between the unit sphereo of finite dimensional Banach Spaces necessarily map antipodal points to antipodal points.Now, the results is obtained in strictly convex (or l_1) spaces, i.e.: If X, Y are two strictly convex (or l_1) spaces, and S(X), S(Y) are the unit spheres of X and Y respectively,f: is an isometry, then f(-x)= - f(x), for any x in S(X). 相似文献
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THE ALEKSANDROV PROBLEM FOR UNIT DISTANCE PRESERVING MAPPING 总被引:9,自引:0,他引:9
马玉梅 《数学物理学报(B辑英文版)》2000,20(3):359-364
1 IntroductionLet X and Y be two real metric spaces. A mappillg f: X ~ Y is called an isometryj ifd(f(x), f(y)) = d(x, y) for all x, y E X.A mapping f: X - Y satisfies the distance one preserving property (DOPP) if f for allx, y E X with d(x, y) = 1 it follows that d(f(x), f(y)) = 1.A mapping f: X ~ Y satisfies the strong distance one preserving property (SDOPP) ifffor all x, y E X with d(x, y) = 1 it follows that d(f(x), f(y)) = 1 and conversely.Problem(P) Let f: X - Y be a mappin… 相似文献
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Some Results About λ-Property 总被引:1,自引:0,他引:1
SomeResultsAboutλ-Property马玉梅,张宜滨SomeResultsAboutλ-Property¥MaYumei;ZhangYibin(Dept.ofmath.,NormalCollegeShijiazhunag,Hebei,0... 相似文献
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本文推广了保1映射的Aleksandrov问题,同时推广了Benz定理和Mazur-Ulam定理。 相似文献