传统的误差配准算法假设系统偏差恒定或缓慢变化,当系统误差发生突变或快速变化时,这一假设不再成立。针对这一问题,研究了时变条件下的误差配准算法,引入渐消因子,对常规的基于地心地固坐标系的广义最小二乘算法(generalized least squ...传统的误差配准算法假设系统偏差恒定或缓慢变化,当系统误差发生突变或快速变化时,这一假设不再成立。针对这一问题,研究了时变条件下的误差配准算法,引入渐消因子,对常规的基于地心地固坐标系的广义最小二乘算法(generalized least squares algorithm based on the earth-centered earth-fixed coordinate system,ECEF-GLS)进行了修正,弱化历史量测对配准的影响,并对渐消因子的选取问题进行了研究,给出了合理的设计方法。算法验证表明,基于渐消因子的ECEF-GLS估计算法能够对时变的系统偏差进行有效估计,精度满足配准要求。展开更多
The embryogenic callus induction and shoot regeneration were studied systematically in elite clone GL9 of Eucalyptus cultivated widely in south China.We investigated TDZ 0.02-0.05 mg·L-1 was the proper concentrat...The embryogenic callus induction and shoot regeneration were studied systematically in elite clone GL9 of Eucalyptus cultivated widely in south China.We investigated TDZ 0.02-0.05 mg·L-1 was the proper concentration.The callus induction rate was 92.9%—100%.When TDZ concentration was higher than 0.1 mg·L-1,the axillary bud germination was completely inhibited.TDZ 0.02 mg·L-1 with combinations of CoCl2 0.125 mg·L-1 could induct the embryogenic callus.The direct regeneration rate was 13.39%±1.03%,and with combinations of NAA 0.1mg·L-1 could not differentiate directly from callus,but higher regeneration rate(20.2%±13.3%) could be obtained by transferring callus onto regeneration medium.The size of callus can increase to 1.4 fold of its original size in the first subculture in modified MS+TDZ 0.02 mg·L-1 +NAA 0.1 mg·L-1medium and the average number of deep-pink-coloured masses of embryogenic cells on each callus was 8.4.In the second and third subculture,callus stopped growing further and the number of masses of embryogenic cells decreased gradually.Regeneration system could lay a good foundation for further transformation research.展开更多
The behavior of catalytic reduction of oxygen on modified electrodes of three types are studied using cyclic voltanuntry in an acidic solution. The first electrode modified with industrial dyestuff Direct Light Turquo...The behavior of catalytic reduction of oxygen on modified electrodes of three types are studied using cyclic voltanuntry in an acidic solution. The first electrode modified with industrial dyestuff Direct Light Turquoise GL(denoted as GL) has notable catalytic activity, two reduction peaks of O2 appear on CV curve (Ep is - 0. 25 V and - 0. 40 V respectively), but its stability is poor The second electrode modified with poly(4-vinyl-pyridine) and GL shows quite good catalytic performance. Both activity and stability are much better than those of the first electrode, in in the CV curve equals 200% of that of the lst electrode and the Ev for the first peak has shifted positively about 0. 05 V.The catalytic perfonnance of the third electrode modified with Nafion and GL is a little bid better than that of the first electrode, but is much worse than that of the second electrode. The reason of differences in the catalytic performances of these electrodes are discussed.展开更多
文摘传统的误差配准算法假设系统偏差恒定或缓慢变化,当系统误差发生突变或快速变化时,这一假设不再成立。针对这一问题,研究了时变条件下的误差配准算法,引入渐消因子,对常规的基于地心地固坐标系的广义最小二乘算法(generalized least squares algorithm based on the earth-centered earth-fixed coordinate system,ECEF-GLS)进行了修正,弱化历史量测对配准的影响,并对渐消因子的选取问题进行了研究,给出了合理的设计方法。算法验证表明,基于渐消因子的ECEF-GLS估计算法能够对时变的系统偏差进行有效估计,精度满足配准要求。
文摘The embryogenic callus induction and shoot regeneration were studied systematically in elite clone GL9 of Eucalyptus cultivated widely in south China.We investigated TDZ 0.02-0.05 mg·L-1 was the proper concentration.The callus induction rate was 92.9%—100%.When TDZ concentration was higher than 0.1 mg·L-1,the axillary bud germination was completely inhibited.TDZ 0.02 mg·L-1 with combinations of CoCl2 0.125 mg·L-1 could induct the embryogenic callus.The direct regeneration rate was 13.39%±1.03%,and with combinations of NAA 0.1mg·L-1 could not differentiate directly from callus,but higher regeneration rate(20.2%±13.3%) could be obtained by transferring callus onto regeneration medium.The size of callus can increase to 1.4 fold of its original size in the first subculture in modified MS+TDZ 0.02 mg·L-1 +NAA 0.1 mg·L-1medium and the average number of deep-pink-coloured masses of embryogenic cells on each callus was 8.4.In the second and third subculture,callus stopped growing further and the number of masses of embryogenic cells decreased gradually.Regeneration system could lay a good foundation for further transformation research.
文摘The behavior of catalytic reduction of oxygen on modified electrodes of three types are studied using cyclic voltanuntry in an acidic solution. The first electrode modified with industrial dyestuff Direct Light Turquoise GL(denoted as GL) has notable catalytic activity, two reduction peaks of O2 appear on CV curve (Ep is - 0. 25 V and - 0. 40 V respectively), but its stability is poor The second electrode modified with poly(4-vinyl-pyridine) and GL shows quite good catalytic performance. Both activity and stability are much better than those of the first electrode, in in the CV curve equals 200% of that of the lst electrode and the Ev for the first peak has shifted positively about 0. 05 V.The catalytic perfonnance of the third electrode modified with Nafion and GL is a little bid better than that of the first electrode, but is much worse than that of the second electrode. The reason of differences in the catalytic performances of these electrodes are discussed.
