Zeeman效应中外磁场临界值的计算公式(英)

本文根据Dirac相对论量子力学理论，分析了不同强弱外磁场下的Zeeman效应与反常Zeeman效应．导出了外磁场强弱划分临界值的计算公式，计算结果表明计算值与报道的实验值很好地吻合．     

Morphology and photoluminescence of BaAl12O19:Mn2+ green phosphor prepared by flux method

This paper reports that the green phosphor BaAl11.9O19:0.1Mn2+ is prepared by a flux assisted solid state reaction method.The effect of flux systems on the crystal structure,morphology and luminescent properties of the phosphor are studied in detail.The samples are characterized by the application of x-ray diffraction patterns,scanning electron microscopy patterns,luminescent spectra and decay curves.The results show that a pure phase BaAl12O19 can be achieved at the firing temperature above 1300℃ by adding the proper flux system,the firing temperature is reduced at least 200℃ in comparison with the conventional solid state reaction method.Maximum photoluminescence emission intensity is observed at 517 nm for(AlF3+Li2CO3) flux system under vacuum ultraviolet region(147 nm) excitation.The photoluminescence emission intensity and the decay time of these phosphor is found to be more superior to that of the corresponding sample prepared by the conventional solid state reaction method implying the suitability of this route for the preparation of display device worthy phosphor materials.     

亚临床甲状腺功能减退症对2型糖尿病患者微血管病变的影响

目的探讨亚临床甲状腺功能减退症（SCH）与2型糖尿病（T2DM）患者糖尿病肾病（DN）、视网膜病变（DR）和周围神经病变（DP）的关联。方法选取T2DM患者436例，根据甲状腺功能是否正常分为SCH组39例和甲状腺功能正常组（EUT组）397例。采用问卷调查的形式记录患者的年龄、糖尿病病程和吸烟史，测量身高、体重和血压，计算体重指数。空腹采血测定血糖（FBG）、糖化血红蛋白（HbA1c）、甘油三酯（TG）、总胆固醇（TC）、低密度脂蛋白（LDL-C）、高密度脂蛋白（HDL-C）、丙氨酸转氨酶（ALT）、促甲状腺素（TSH）、甲状腺激素和血肌酐（Scr）。取中段晨尿行尿白蛋白和Scr检测，计算尿白蛋白肌酐比率（UACR）。SCH与DN、DR及DP等糖尿病微血管并发症的关联采用logistic回归法。结果 SCH组患者的年龄、性别、糖尿病病程、吸烟史、TC、LDL-C、Scr、UACR和TSH水平明显高于EUT组，差异均有统计学意义（P＜0.05或0.01）。通过多因素logistic回归法校正多种影响因素后，发现SCH与DN具有明显相关性（P＜0.05），SCH与DR和DP均无明显相关性（均P＞0.05）。结论 SCH为T2DM患者DN的独立危险因素，与T2DM患者DR和DP病变无关。