The chaotic oscillator has already been considered as a powerful method to detect weak signals, even weak signals accompanied with noises. However, many examples, analyses and simulations indicate that chaotic oscilla...The chaotic oscillator has already been considered as a powerful method to detect weak signals, even weak signals accompanied with noises. However, many examples, analyses and simulations indicate that chaotic oscillator detection system cannot guarantee the immunity to noises （even white noise）. In fact the randomness of noises has a serious or even a destructive effect on the detection results in many cases. To solve this problem, we present a new detecting method based on wavelet threshold processing that can detect the chaotic weak signal accompanied with noise. All theoretical analyses and simulation experiments indicate that the new method reduces the noise interferences to detection significantly, thereby making the corresponding chaotic oscillator that detects the weak signals accompanied with noises more stable and reliable.展开更多
Objectives To observe the effect of β3-Adrenoceptor （AR） on ventricle fibrillation threshold （VFT） and effective refractory period （ERP） in rats with heart failure. Methods Rats were randomized into control gro...Objectives To observe the effect of β3-Adrenoceptor （AR） on ventricle fibrillation threshold （VFT） and effective refractory period （ERP） in rats with heart failure. Methods Rats were randomized into control group and heart failure group. The expression of β3-ARmRNA was detected with RTPCR; The VFT, ERP, LVESP,LVEDP, ＋dp/dtmax and -dp/dtmax was measured at the same time with administration of BRL37344 （ 2 nmol / kg, β3- AR agonist）. Results ①Both the expression of β3-AR mRNA and the proportion increased in rats with heart failure in comparison with control rats （0.028 vs. 0.011 and 5.4% vs 1.2%, P 〈 0.05）;② ERP was longer in rats with heart failure than control group （70.5±5.5 ms vs 59.5±6.4ms, P 〈 0.05） and there was no difference of ERP in rats with heart failure with administration of BRL37344 （73.0±4.8 ms vs 70.5± 5.5 ms, P 〉0.05）; ③VFT was lower in rats with heart failure than control group（10.9±0.8 mv vs 30.5± 1.3 mv, P〈 0.05） and decreased obviously in rats with heart failure with administration of BRL37344 （7.1±0.6 mv vs 10.9±0.8 mv, P 〈 0.05） ; The decrease of VFT correlated with the effect on LVESP, ＋dp/ dtmax,-dp/dtmax of BRL37344 and the expression of β3-AR mRNA （correlation coefficient： 0.788, 0.708, 0.759, 0.787; P 〈 0.05）. Conclusions The expression of β3-AR mRNA of left ventricle was obviously increased in rats with heart failure, and activation of β3-AR had no effect on ERP but could decreased VFT which correlated with the effect of β3-AR on LVESP, ＋dp/dtmax, -dp/dtmax and the expression of β3-AR mRNA.展开更多
为预测及综合防治豆科植物的害虫长额负蝗(Atractomorpha lata Motschoulsky),研究温度对长额负蝗生长发育、存活和繁殖的影响,在室内人工气候箱16、20、24、28和32℃共5个恒温条件下,以大豆豆叶为寄主进行饲养,研究温度对长额负蝗的各...为预测及综合防治豆科植物的害虫长额负蝗(Atractomorpha lata Motschoulsky),研究温度对长额负蝗生长发育、存活和繁殖的影响,在室内人工气候箱16、20、24、28和32℃共5个恒温条件下,以大豆豆叶为寄主进行饲养,研究温度对长额负蝗的各虫态发育历期、发育速率及存活率的影响。结果表明:在16℃条件下长额负蝗无法完成世代发育。在试验温度范围内,卵、若虫和全世代平均发育历期随温度升高而缩短,成虫寿命为先升高再降低,通过拟合方程得出发育速率与温度呈正相关。采用直线回归法计算出长额负蝗卵期、若虫期、成虫期和全世代发育起点温度分别为10.81、14.50、18.98、15.17℃,有效积温分别为464.91、453.43、148.41和1078.41 d·℃。长额负蝗成虫产卵量在24℃时最高,为80.37粒/雌,20℃最低,为26.47粒/雌,在20~32℃条件下,种群趋势指数I均大于1,24℃时I值最大,为11.31。温度对长额负蝗存活率影响显著。研究结果可为长额负蝗发生期预测及综合防治提供理论依据。展开更多
目的:观察早产儿视网膜病变(retinopathy of prematurity,ROP)激光光凝术后嵴前部分无血管化区的临床转归,为ROP的临床治疗提供依据。方法:前瞻性随访观察2014-06/2016-06由我院ROP筛查协作组在门诊以及NICU床旁筛查发现并进行视网膜激...目的:观察早产儿视网膜病变(retinopathy of prematurity,ROP)激光光凝术后嵴前部分无血管化区的临床转归,为ROP的临床治疗提供依据。方法:前瞻性随访观察2014-06/2016-06由我院ROP筛查协作组在门诊以及NICU床旁筛查发现并进行视网膜激光光凝治疗的患儿186例372眼,激光光凝术后嵴前存在部分无血管区的患儿26例32眼,其中男17例18眼,女9例14眼,平均出生胎龄(29.4±0.4)周,平均出生体质量1222.8±70.3g,阈值前1型10例12眼,阈值期12例14眼、急性进展性后极部型4例6眼,分别于激光术后1、3、8、12wk行Retcam眼底照相复查,观察病变嵴、嵴前无血管区以及附加病变的消退情况。随访中如发现病变嵴或附加病变加重,则给予补充视网膜激光光凝或行玻璃体腔抗VEGF治疗,直至病变嵴和附加病变完全消退,病情稳定。结果:患儿26例均在激光术后1wk复查时发现病变嵴前无血管区,但附加病变减轻,病变嵴由3期向2期、1期消退,阈值前1型消退最明显;3wk复查时27眼(84%)病变嵴为1期或不明显、无血管区逐渐缩小,视网膜血管向周边发育;5眼(16%)无血管区缩小不显著,附加病变(+^++),病变嵴3~4期、或伴有出血,其中3眼(9%)为阈值期病变患儿,2眼(6%)为急性进展性后极部型患儿,遂及时给予补充视网膜光凝;8wk复查,未补充视网膜光凝的27眼嵴前无血管区已血管化,嵴及附加病变消退;补充光凝中3眼(9%)病情得到控制、稳定,其中阈值期2眼、急性进展性后极部型1眼,2眼(6%)嵴上新生血管消退不明显、附加病变依然存在,其中阈值期1眼、急性进展性后极部型1眼,故给予玻璃体腔抗VEGF治疗,12wk复查时见附加病变、病变嵴消退,视网膜血管向颞侧走形稍僵直。结论:视网膜激光光凝是ROP治疗的有效方法,光凝术后嵴前部分无血管区多可自行发育完善。对于少数激光术后病情活动的阈值期及急性进展性后极部型嵴前部分无血管区需及时补充激光光凝治疗,必要时可联合玻璃体腔抗VEGF治疗。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 10731050)the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (Grant No. IRTO0742)
文摘The chaotic oscillator has already been considered as a powerful method to detect weak signals, even weak signals accompanied with noises. However, many examples, analyses and simulations indicate that chaotic oscillator detection system cannot guarantee the immunity to noises （even white noise）. In fact the randomness of noises has a serious or even a destructive effect on the detection results in many cases. To solve this problem, we present a new detecting method based on wavelet threshold processing that can detect the chaotic weak signal accompanied with noise. All theoretical analyses and simulation experiments indicate that the new method reduces the noise interferences to detection significantly, thereby making the corresponding chaotic oscillator that detects the weak signals accompanied with noises more stable and reliable.
文摘Objectives To observe the effect of β3-Adrenoceptor （AR） on ventricle fibrillation threshold （VFT） and effective refractory period （ERP） in rats with heart failure. Methods Rats were randomized into control group and heart failure group. The expression of β3-ARmRNA was detected with RTPCR; The VFT, ERP, LVESP,LVEDP, ＋dp/dtmax and -dp/dtmax was measured at the same time with administration of BRL37344 （ 2 nmol / kg, β3- AR agonist）. Results ①Both the expression of β3-AR mRNA and the proportion increased in rats with heart failure in comparison with control rats （0.028 vs. 0.011 and 5.4% vs 1.2%, P 〈 0.05）;② ERP was longer in rats with heart failure than control group （70.5±5.5 ms vs 59.5±6.4ms, P 〈 0.05） and there was no difference of ERP in rats with heart failure with administration of BRL37344 （73.0±4.8 ms vs 70.5± 5.5 ms, P 〉0.05）; ③VFT was lower in rats with heart failure than control group（10.9±0.8 mv vs 30.5± 1.3 mv, P〈 0.05） and decreased obviously in rats with heart failure with administration of BRL37344 （7.1±0.6 mv vs 10.9±0.8 mv, P 〈 0.05） ; The decrease of VFT correlated with the effect on LVESP, ＋dp/ dtmax,-dp/dtmax of BRL37344 and the expression of β3-AR mRNA （correlation coefficient： 0.788, 0.708, 0.759, 0.787; P 〈 0.05）. Conclusions The expression of β3-AR mRNA of left ventricle was obviously increased in rats with heart failure, and activation of β3-AR had no effect on ERP but could decreased VFT which correlated with the effect of β3-AR on LVESP, ＋dp/dtmax, -dp/dtmax and the expression of β3-AR mRNA.
文摘为预测及综合防治豆科植物的害虫长额负蝗(Atractomorpha lata Motschoulsky),研究温度对长额负蝗生长发育、存活和繁殖的影响,在室内人工气候箱16、20、24、28和32℃共5个恒温条件下,以大豆豆叶为寄主进行饲养,研究温度对长额负蝗的各虫态发育历期、发育速率及存活率的影响。结果表明:在16℃条件下长额负蝗无法完成世代发育。在试验温度范围内,卵、若虫和全世代平均发育历期随温度升高而缩短,成虫寿命为先升高再降低,通过拟合方程得出发育速率与温度呈正相关。采用直线回归法计算出长额负蝗卵期、若虫期、成虫期和全世代发育起点温度分别为10.81、14.50、18.98、15.17℃,有效积温分别为464.91、453.43、148.41和1078.41 d·℃。长额负蝗成虫产卵量在24℃时最高,为80.37粒/雌,20℃最低,为26.47粒/雌,在20~32℃条件下,种群趋势指数I均大于1,24℃时I值最大,为11.31。温度对长额负蝗存活率影响显著。研究结果可为长额负蝗发生期预测及综合防治提供理论依据。
文摘目的:观察早产儿视网膜病变(retinopathy of prematurity,ROP)激光光凝术后嵴前部分无血管化区的临床转归,为ROP的临床治疗提供依据。方法:前瞻性随访观察2014-06/2016-06由我院ROP筛查协作组在门诊以及NICU床旁筛查发现并进行视网膜激光光凝治疗的患儿186例372眼,激光光凝术后嵴前存在部分无血管区的患儿26例32眼,其中男17例18眼,女9例14眼,平均出生胎龄(29.4±0.4)周,平均出生体质量1222.8±70.3g,阈值前1型10例12眼,阈值期12例14眼、急性进展性后极部型4例6眼,分别于激光术后1、3、8、12wk行Retcam眼底照相复查,观察病变嵴、嵴前无血管区以及附加病变的消退情况。随访中如发现病变嵴或附加病变加重,则给予补充视网膜激光光凝或行玻璃体腔抗VEGF治疗,直至病变嵴和附加病变完全消退,病情稳定。结果:患儿26例均在激光术后1wk复查时发现病变嵴前无血管区,但附加病变减轻,病变嵴由3期向2期、1期消退,阈值前1型消退最明显;3wk复查时27眼(84%)病变嵴为1期或不明显、无血管区逐渐缩小,视网膜血管向周边发育;5眼(16%)无血管区缩小不显著,附加病变(+^++),病变嵴3~4期、或伴有出血,其中3眼(9%)为阈值期病变患儿,2眼(6%)为急性进展性后极部型患儿,遂及时给予补充视网膜光凝;8wk复查,未补充视网膜光凝的27眼嵴前无血管区已血管化,嵴及附加病变消退;补充光凝中3眼(9%)病情得到控制、稳定,其中阈值期2眼、急性进展性后极部型1眼,2眼(6%)嵴上新生血管消退不明显、附加病变依然存在,其中阈值期1眼、急性进展性后极部型1眼,故给予玻璃体腔抗VEGF治疗,12wk复查时见附加病变、病变嵴消退,视网膜血管向颞侧走形稍僵直。结论:视网膜激光光凝是ROP治疗的有效方法,光凝术后嵴前部分无血管区多可自行发育完善。对于少数激光术后病情活动的阈值期及急性进展性后极部型嵴前部分无血管区需及时补充激光光凝治疗,必要时可联合玻璃体腔抗VEGF治疗。
