在舰船升沉信息的实时测量过程中,升沉滤波器实现了低频衰减和特定频段二次积分,但其存在输出相位超前的问题,并且超前相位的大小随输入信号频率变化。首先分析了升沉滤波器的误差特性,然后针对相位超前和噪声、零偏对系统影响的问题,...在舰船升沉信息的实时测量过程中,升沉滤波器实现了低频衰减和特定频段二次积分,但其存在输出相位超前的问题,并且超前相位的大小随输入信号频率变化。首先分析了升沉滤波器的误差特性,然后针对相位超前和噪声、零偏对系统影响的问题,提出了基于带限傅里叶线性组合(band-limited multiple Fourier linear combiner,BMFLC)算法校正滤波器输出的方法,并分析了算法中参数的选取和算法的计算量,实现了在抑制噪声和零偏的影响下对滤波器的输出进行幅度和相位补偿,进而提高了测量精度。仿真结果表明,提出的基于BMFLC算法的舰船升沉测量方法对升沉滤波器的输出进行了补偿,能够很好地解决超前相位误差和噪声、零偏影响的问题,实现了舰船升沉信息测量的实时性和准确性。展开更多
标本来自外科手术取出的新鲜乳腺涂片,经病理学确诊后获得32例。应用显微分光光度计技术,对各种乳腺疾患的单个细胞的间期核进行DNA含量测定。以2例正常人耳血和4例乳腺疾患的淋巴细胞,作为二倍体细胞的DNA含量的对照参考值。测得正常...标本来自外科手术取出的新鲜乳腺涂片,经病理学确诊后获得32例。应用显微分光光度计技术,对各种乳腺疾患的单个细胞的间期核进行DNA含量测定。以2例正常人耳血和4例乳腺疾患的淋巴细胞,作为二倍体细胞的DNA含量的对照参考值。测得正常淋巴细胞DNA平均值为11.22±0.2 A.U和10.98±1.3 A U。乳腺病灶旁组织10例,其上皮核DNA平均值为12.5±1.3 A U;乳腺增生5例,为21.36±1.6 A U;乳腺纤维瘤9例,为22.61±1.0 A.U;乳腺癌8例,为31.9±2.3 A.U。本文认为,乳腺癌细胞的DNA值表现不正常,多倍体细胞增多,组方图右移,带双峰或多峰的非整倍体分布图形。良性乳腺病的DNA含量,比癌细胞低得多,但比正常细胞高,它们的DNA峰值位于二倍体~四倍体之间。我们认为,应用DNA原位定量技术,对癌变细胞的早期和预后诊断,以及抗癌药物疗效的判断,有重要的参考价值。展开更多
Spread-F is a manifestation of ionospheric irregularities and generally takes place at nighttime. However, it can also be ob- served seldom at daytime, It is recognized that acoustic gravity waves （AGWs） play an imp...Spread-F is a manifestation of ionospheric irregularities and generally takes place at nighttime. However, it can also be ob- served seldom at daytime, It is recognized that acoustic gravity waves （AGWs） play an important role in triggering plasma instability which results in spread-F in the ionosphere. The typhoon is a main source of the AGWs. In this paper, two cases of ionospheric daytime spread-F in the period of typhoon were analyzed. One case was on July 29, 1988 and the other was on August 01, 1989. The results showed the following： 1） There were some wave-like disturbances appearing in the HF Doppler records firstly, consequently the Doppler echo traces became scattered, which indicated that the ionospheric spread-F was triggered; 2） the blurred echo traces in the both two cases appeared in the morning （08：30-11：30 Beijing time） and lasted for more than two hours; 3） with the blurred echoes gradually weakening, the traveling ionospheric disturbances （TIDs） still ex- isted and became clearer; 4） the frequency shifts in the two of the radio wave in the ionosphere moved downwards. spread-F during the typhoon period in Asian region. cases were both positive, implying the effective reflecting surface These results provide good observational evidence for daytime展开更多
The localization of IL6 at light microscopic levels and its quantitative analysis in human placentas were studied by using immunohistochemistry. Both syncytiotrophoblast and cytotrophoblast in placental villi, white b...The localization of IL6 at light microscopic levels and its quantitative analysis in human placentas were studied by using immunohistochemistry. Both syncytiotrophoblast and cytotrophoblast in placental villi, white blood cells in villose capillary cavity stromal cells and capillary endothelium present IL6 immunoreactivity in cytoplasm. Using a quantitative immunohistochemical method, the amounts of IL6 in placenta were low at the 6th week of gestation, increased saliently and peaked at the 7th, then reduced gradually during the rest of the gestation period and maintained the same level as that in the 6th week of gestation. This changing trend was paralleled with that of GnRH in our previous studies. These results revealed that IL6 could be produced by the human placenta and may take part in the regulation of placental hormone releasing.展开更多
文摘在舰船升沉信息的实时测量过程中,升沉滤波器实现了低频衰减和特定频段二次积分,但其存在输出相位超前的问题,并且超前相位的大小随输入信号频率变化。首先分析了升沉滤波器的误差特性,然后针对相位超前和噪声、零偏对系统影响的问题,提出了基于带限傅里叶线性组合(band-limited multiple Fourier linear combiner,BMFLC)算法校正滤波器输出的方法,并分析了算法中参数的选取和算法的计算量,实现了在抑制噪声和零偏的影响下对滤波器的输出进行幅度和相位补偿,进而提高了测量精度。仿真结果表明,提出的基于BMFLC算法的舰船升沉测量方法对升沉滤波器的输出进行了补偿,能够很好地解决超前相位误差和噪声、零偏影响的问题,实现了舰船升沉信息测量的实时性和准确性。
文摘标本来自外科手术取出的新鲜乳腺涂片,经病理学确诊后获得32例。应用显微分光光度计技术,对各种乳腺疾患的单个细胞的间期核进行DNA含量测定。以2例正常人耳血和4例乳腺疾患的淋巴细胞,作为二倍体细胞的DNA含量的对照参考值。测得正常淋巴细胞DNA平均值为11.22±0.2 A.U和10.98±1.3 A U。乳腺病灶旁组织10例,其上皮核DNA平均值为12.5±1.3 A U;乳腺增生5例,为21.36±1.6 A U;乳腺纤维瘤9例,为22.61±1.0 A.U;乳腺癌8例,为31.9±2.3 A.U。本文认为,乳腺癌细胞的DNA值表现不正常,多倍体细胞增多,组方图右移,带双峰或多峰的非整倍体分布图形。良性乳腺病的DNA含量,比癌细胞低得多,但比正常细胞高,它们的DNA峰值位于二倍体~四倍体之间。我们认为,应用DNA原位定量技术,对癌变细胞的早期和预后诊断,以及抗癌药物疗效的判断,有重要的参考价值。
基金supported by the National Natural Science Foundation of China (Grant Nos. 40974091, 41174135 and 40921063)the Specialized Research Fund for State Key Laboratories
文摘Spread-F is a manifestation of ionospheric irregularities and generally takes place at nighttime. However, it can also be ob- served seldom at daytime, It is recognized that acoustic gravity waves （AGWs） play an important role in triggering plasma instability which results in spread-F in the ionosphere. The typhoon is a main source of the AGWs. In this paper, two cases of ionospheric daytime spread-F in the period of typhoon were analyzed. One case was on July 29, 1988 and the other was on August 01, 1989. The results showed the following： 1） There were some wave-like disturbances appearing in the HF Doppler records firstly, consequently the Doppler echo traces became scattered, which indicated that the ionospheric spread-F was triggered; 2） the blurred echo traces in the both two cases appeared in the morning （08：30-11：30 Beijing time） and lasted for more than two hours; 3） with the blurred echoes gradually weakening, the traveling ionospheric disturbances （TIDs） still ex- isted and became clearer; 4） the frequency shifts in the two of the radio wave in the ionosphere moved downwards. spread-F during the typhoon period in Asian region. cases were both positive, implying the effective reflecting surface These results provide good observational evidence for daytime
文摘The localization of IL6 at light microscopic levels and its quantitative analysis in human placentas were studied by using immunohistochemistry. Both syncytiotrophoblast and cytotrophoblast in placental villi, white blood cells in villose capillary cavity stromal cells and capillary endothelium present IL6 immunoreactivity in cytoplasm. Using a quantitative immunohistochemical method, the amounts of IL6 in placenta were low at the 6th week of gestation, increased saliently and peaked at the 7th, then reduced gradually during the rest of the gestation period and maintained the same level as that in the 6th week of gestation. This changing trend was paralleled with that of GnRH in our previous studies. These results revealed that IL6 could be produced by the human placenta and may take part in the regulation of placental hormone releasing.
