Effects of Dual-Electrode Biasing on Er in a Toroidal Plasma

Two externally biased electrodes were inserted into the plasma on the KT-5C tokamak to test the effects on modifying the radial electric field Er, other than single biasing. Using various combinations of biasing voltage,the influences of double biasing are compared with the single biasing. It turns out that the effect of dual-biasing is also effective as a single one, but the outer electrode seems to be shielded by the inner one and show less influence. The results clearly show that the radial electric field Er changed by external biasing is intrinsically an effect localized at the edge of the plasma, which is caused by the electrode induced radial current; and dualelectrode biasing using the method similar to the single biasing seems not to be able to increase more distinctly the peaking effect on Er than the single biasing.     

置换环上的稳定矩阵

本文证明了置换环上的正则稳定矩阵是幂等矩阵和可逆矩阵的积,进一步证明了置换环上的正则稳定矩阵可以对角化。     

Reduction of Dislocations in GaN Epilayer Grown on Si （111） Substrates using a GaN Intermedial Layer

GaN intermedial layers grown under different pressures are inserted between GaN epilayers and AIN/Si（111） substrates. In situ optical reflectivity measurements show that a transition from the three-dimensional （3D） mode to the 2I） one occurs during the GaN epilayer growth when a higher growth pressure is used during the preceding GaN intermedial layer growth, and an improvement of the crystalline quality of GaN epilayer will be made. Combining the in situ reflectivity and transmission electron microscopy （TEM） measurements, it is suggested that the lateral growth at the transition of growth mode is favourable for bending of dislocation lines, thus reducing the density of threading dislocations in the epilayer.     

合成高分子化合物的功能團反應

最近年來人們對於合成高分子化合物的功能團反應,開始注意並發生極大的興趣。高分子化合物在物理或化學因素影响下能够起化涫變化,這是很早就被研究的了。例如,在熱的影响下,不同的高分子達到不同高度的溫度時就能發生裂解,也就是主鏈開始断開。有些形成複雜     

杯芳烃的配位化学──Ⅳ.对叔丁基杯[8]芳烃与钙、镉配合物的合成与表征

本文合成了对叔丁基杯[8]芳烃(H₈L)与钙、镉的固体配合物。并以元素分析、核磁共振、热谱、红外谱、紫外谱等进行表征。其配合物的组成分别为Ca(H₆L)·6dmf及Cd(H₆L)·6dmf.     

双抗转基因烟草纯合系的选育及田间试验

为了将双抗转基因烟草推向实用,进行了双抗转基因烟草纯合系的选育。在试验田中利用人工攻毒进行了T1代植物的抗病毒特性的分离试验;在抗性良好的T1植株的后代T2代植物上进行了田间的病毒接种试验和转基因表达的分析,从中选育出双抗转基因烟草纯合系。又于试验田中,在这些纯合系后代T3代上验证了抗病毒特性的遗传稳定性。在转基因表达分析中,发现CMV外壳蛋白基因的表达在翻译水平上受到抑制。     

高效液相色谱法测定废水中水杨酸及相关物质的含量

采用高效液相色谱法，在苯基柱上，以甲醇-水-磷酸(40：60：1，V／V／V)溶液为流动相，285nm检测，测定了废水中水杨酸及相关物苯酚、对羟基苯甲酸和对羟基间苯二甲酸的含量。该方法简便、快速，用于实际样品测定，获得满意的结果。