Intercepted signal blind separation is a research topic with high importance for both military and civilian communication systems. A blind separation method for space-time block code （STBC） systems is proposed by us...Intercepted signal blind separation is a research topic with high importance for both military and civilian communication systems. A blind separation method for space-time block code （STBC） systems is proposed by using the ordinary independent component analysis （ICA）. This method cannot work when specific complex modulations are employed since the assumption of mutual independence cannot be satisfied. The analysis shows that source signals, which are group-wise independent and use multi-dimensional ICA （MICA） instead of ordinary ICA, can be applied in this case. Utilizing the block-diagonal structure of the cumulant matrices, the JADE algorithm is generalized to the multidimensional case to separate the received data into mutually independent groups. Compared with ordinary ICA algorithms, the proposed method does not introduce additional ambiguities. Simulations show that the proposed method overcomes the drawback and achieves a better performance without utilizing coding information than channel estimation based algorithms.展开更多
Based on China Family Panel Studies(CFPS) data and global MPI standard,this paper measures and analyzes multi-dimensional poverty in China. The study finds that the level of multi-dimensional poverty in China is not h...Based on China Family Panel Studies(CFPS) data and global MPI standard,this paper measures and analyzes multi-dimensional poverty in China. The study finds that the level of multi-dimensional poverty in China is not high and tends to decrease over time.Uneven regional development significantly affects multi-dimensional poverty. The poor are deprived in health, education and other aspects, but indicator contributions vary among specific groups of people. Overlap between economic poverty and multi-dimensional poverty has a trend of inter-temporal reduction. China's development-centered poverty reduction policy has achieved great results and significantly improved the development capabilities of the poor. Development-oriented approach is China's important experience in poverty reduction, and forebodes China's bright prospect of achieving its goal to complete building a moderately prosperous society by 2020.展开更多
目的探讨加油站职业人群外周静脉血红细胞膜丙二醛(MDA)负荷及其主要影响因素,为加油站职业人群的疾病预防和控制工作提供参考。方法本研究运用流行病学整群抽样研究方法,抽取加油站健康工作人员97名,以肝素钠抗凝管采集外周静脉血样2 m...目的探讨加油站职业人群外周静脉血红细胞膜丙二醛(MDA)负荷及其主要影响因素,为加油站职业人群的疾病预防和控制工作提供参考。方法本研究运用流行病学整群抽样研究方法,抽取加油站健康工作人员97名,以肝素钠抗凝管采集外周静脉血样2 m L,实验室分离出红细胞膜,以考马斯亮蓝染色法作蛋白定量分析,以硫代巴比妥法(TBA法)分析红细胞膜MDA负荷;利用调查问卷对可能影响MDA负荷的因素进行调查;以MDA负荷中位数作为临界值,将各样本红细胞膜MDA负荷实测值转化为二分变量的应变量,以被调查的可能影响因素为自变量,运用单因素和多因素的非条件Logistic回归分析方法探索影响MDA负荷的主要因素。结果分析发现,在被调查的9个可能影响因素当中,工人的工龄、饮茶习惯、吸烟情况及工种等4个因素最终进入回归方程。结论工人的工龄、饮茶习惯、吸烟情况及工种等是加油站工人红细胞膜MDA负荷的主要影响因素。展开更多
ObjectiveTo investigate the anticancer property of marine sediment actinomycetes against two different breast cancer cell lines.MethodsIn vitro anticancer activity was carried out against breast (MCF-7 and MDA-MB-231)...ObjectiveTo investigate the anticancer property of marine sediment actinomycetes against two different breast cancer cell lines.MethodsIn vitro anticancer activity was carried out against breast (MCF-7 and MDA-MB-231) cancer cell lines. Partial sequences of the 16s rRNA gene, phylogenetic tree construction, multiple sequence analysis and secondary structure analysis were also carried out with the actinomycetes isolates.ResultsOf the selected five actinomycete isolates, ACT01 and ACT02 showed the IC50 value with (10.13±0.92) and (22.34±5.82) μg/mL concentrations, respectively for MCF-7 cell line at 48 h, but ACT01 showed the minimum (18.54±2.49 μg/mL) level of IC50 value with MDA-MB-231 cell line. Further, the 16s rRNA partial sequences of ACT01, ACT02, ACT03, ACT04 and ACT05 isolates were also deposited in NCBI data bank with the accession numbers of GQ478246, GQ478247, GQ478248, GQ478249 and GQ478250, respectively. The phylogenetic tree analysis showed that, the isolates of ACT02 and ACT03 were represented in group I and III, respectively, but ACT01 and ACT02 were represented in group II. The multiple sequence alignment of the actinomycete isolates showed that, the maximum identical conserved regions were identified with the nucleotide regions of 125 to 221st base pairs, 65 to 119th base pairs and 55, 48 and 31st base pairs. Secondary structure prediction of the 16s rRNA showed that, the maximum free energy was consumed with ACT03 isolate (-45.4 kkal/mol) and the minimum free energy was consumed with ACT04 isolate (?7.6 kkal/mol).ConclusionsThe actinomycete isolates of ACT01 and ACT02 (GQ478246 and GQ478247) which are isolated from sediment sample can be further used as anticancer agents against breast cancer cell lines.展开更多
基坑开挖工程中,最大地表沉降和最大墙体侧移是非常重要的两个变形量。然而由于土体存在变异性,基坑开挖变形难以准确预测。提出一种基于KJHH模型的基坑开挖概率反分析方法,可以同时预测最大地表沉降和最大墙体侧移。在贝叶斯更新框架下...基坑开挖工程中,最大地表沉降和最大墙体侧移是非常重要的两个变形量。然而由于土体存在变异性,基坑开挖变形难以准确预测。提出一种基于KJHH模型的基坑开挖概率反分析方法,可以同时预测最大地表沉降和最大墙体侧移。在贝叶斯更新框架下,动态融合各开挖阶段观测数据,利用多重数据同化集合平滑器(Ensemble smoother with multiple data assimilation, ES-MDA)更新土体参数,提高变形预测准确性。以台北TNEC基坑工程为例,验证了所提方法的有效性。实验结果表明:随着融合更多不同开挖阶段的观测数据,预测均值和实测值趋于一致;对于TNEC工程,假设先验分布服从对数正态分布得到的开挖变形预测结果略大于采用均匀分布时的预测结果;变形预测的准确性随着迭代次数和样本量的增加而提高。展开更多
基金supported by the National Natural Science Foundation of China (61201282)
文摘Intercepted signal blind separation is a research topic with high importance for both military and civilian communication systems. A blind separation method for space-time block code （STBC） systems is proposed by using the ordinary independent component analysis （ICA）. This method cannot work when specific complex modulations are employed since the assumption of mutual independence cannot be satisfied. The analysis shows that source signals, which are group-wise independent and use multi-dimensional ICA （MICA） instead of ordinary ICA, can be applied in this case. Utilizing the block-diagonal structure of the cumulant matrices, the JADE algorithm is generalized to the multidimensional case to separate the received data into mutually independent groups. Compared with ordinary ICA algorithms, the proposed method does not introduce additional ambiguities. Simulations show that the proposed method overcomes the drawback and achieves a better performance without utilizing coding information than channel estimation based algorithms.
基金funded by the following projects:Major project of the National Social Science Fund of China(NSSFC) "Rural China’s Data Collection and Application Program"(Project No.18ZDA080)The National Natural Science Foundation of China(NSFC) "Measurement of Multi-Dimensional Poverty for Rural & Urban Residents and Pro-Poor Policy Evaluation"(Project No.71874089)Humanities and Social Sciences Fund Youth Project of the Ministry of Education "Study on Multi-Dimensional Poverty Micro Simulation Model under the Constraints of Poverty Reduction Targets"(Project No.18YJC910015)
文摘Based on China Family Panel Studies(CFPS) data and global MPI standard,this paper measures and analyzes multi-dimensional poverty in China. The study finds that the level of multi-dimensional poverty in China is not high and tends to decrease over time.Uneven regional development significantly affects multi-dimensional poverty. The poor are deprived in health, education and other aspects, but indicator contributions vary among specific groups of people. Overlap between economic poverty and multi-dimensional poverty has a trend of inter-temporal reduction. China's development-centered poverty reduction policy has achieved great results and significantly improved the development capabilities of the poor. Development-oriented approach is China's important experience in poverty reduction, and forebodes China's bright prospect of achieving its goal to complete building a moderately prosperous society by 2020.
文摘目的分析氧化应激产物丙二醛(MDA)与生育力和精子参数的相关性。方法检索Pub Med、Cochrane、中国知网、万方数据库、维普数据库等国内外医学文献数据库,查找MDA与精子质量相关的文献,检索时间从建库至2017年8月,根据纳入和排除标准严格筛选文献,提取数据指标,将相关系数r转换为fisher's Z值,采用Rev Man 5.3软件进行Meta分析。结果共检索出英文文献766篇,中文文献233篇,经过筛选后纳入16篇文献。分析结果表明不育患者精液的MDA水平明显高于正常对照组(SMD=0.80,95%CI=0.67~0.92,P<0.01);MDA与精子活动率呈负相关(r=-0.35,95%CI=-0.41^-0.31,P<0.01);MDA与精子密度也呈负相关(r=-0.37,95%CI=-0.45^-0.28,P<0.01)。结论不育患者精液中MDA水平明显高于正常生育男性,并与精子活动率及密度呈负相关,MDA可作为诊断和治疗不育的敏感指标。
文摘目的探讨加油站职业人群外周静脉血红细胞膜丙二醛(MDA)负荷及其主要影响因素,为加油站职业人群的疾病预防和控制工作提供参考。方法本研究运用流行病学整群抽样研究方法,抽取加油站健康工作人员97名,以肝素钠抗凝管采集外周静脉血样2 m L,实验室分离出红细胞膜,以考马斯亮蓝染色法作蛋白定量分析,以硫代巴比妥法(TBA法)分析红细胞膜MDA负荷;利用调查问卷对可能影响MDA负荷的因素进行调查;以MDA负荷中位数作为临界值,将各样本红细胞膜MDA负荷实测值转化为二分变量的应变量,以被调查的可能影响因素为自变量,运用单因素和多因素的非条件Logistic回归分析方法探索影响MDA负荷的主要因素。结果分析发现,在被调查的9个可能影响因素当中,工人的工龄、饮茶习惯、吸烟情况及工种等4个因素最终进入回归方程。结论工人的工龄、饮茶习惯、吸烟情况及工种等是加油站工人红细胞膜MDA负荷的主要影响因素。
基金supported by Indian Council of Medical Research,New Delhi(grant No.59/6/200/BMS/TRM)
文摘ObjectiveTo investigate the anticancer property of marine sediment actinomycetes against two different breast cancer cell lines.MethodsIn vitro anticancer activity was carried out against breast (MCF-7 and MDA-MB-231) cancer cell lines. Partial sequences of the 16s rRNA gene, phylogenetic tree construction, multiple sequence analysis and secondary structure analysis were also carried out with the actinomycetes isolates.ResultsOf the selected five actinomycete isolates, ACT01 and ACT02 showed the IC50 value with (10.13±0.92) and (22.34±5.82) μg/mL concentrations, respectively for MCF-7 cell line at 48 h, but ACT01 showed the minimum (18.54±2.49 μg/mL) level of IC50 value with MDA-MB-231 cell line. Further, the 16s rRNA partial sequences of ACT01, ACT02, ACT03, ACT04 and ACT05 isolates were also deposited in NCBI data bank with the accession numbers of GQ478246, GQ478247, GQ478248, GQ478249 and GQ478250, respectively. The phylogenetic tree analysis showed that, the isolates of ACT02 and ACT03 were represented in group I and III, respectively, but ACT01 and ACT02 were represented in group II. The multiple sequence alignment of the actinomycete isolates showed that, the maximum identical conserved regions were identified with the nucleotide regions of 125 to 221st base pairs, 65 to 119th base pairs and 55, 48 and 31st base pairs. Secondary structure prediction of the 16s rRNA showed that, the maximum free energy was consumed with ACT03 isolate (-45.4 kkal/mol) and the minimum free energy was consumed with ACT04 isolate (?7.6 kkal/mol).ConclusionsThe actinomycete isolates of ACT01 and ACT02 (GQ478246 and GQ478247) which are isolated from sediment sample can be further used as anticancer agents against breast cancer cell lines.
文摘基坑开挖工程中,最大地表沉降和最大墙体侧移是非常重要的两个变形量。然而由于土体存在变异性,基坑开挖变形难以准确预测。提出一种基于KJHH模型的基坑开挖概率反分析方法,可以同时预测最大地表沉降和最大墙体侧移。在贝叶斯更新框架下,动态融合各开挖阶段观测数据,利用多重数据同化集合平滑器(Ensemble smoother with multiple data assimilation, ES-MDA)更新土体参数,提高变形预测准确性。以台北TNEC基坑工程为例,验证了所提方法的有效性。实验结果表明:随着融合更多不同开挖阶段的观测数据,预测均值和实测值趋于一致;对于TNEC工程,假设先验分布服从对数正态分布得到的开挖变形预测结果略大于采用均匀分布时的预测结果;变形预测的准确性随着迭代次数和样本量的增加而提高。
