时序分析是合成孔径雷达干涉测量(InSAR)的一项关键技术,它被广泛应用于监测广阔地区的地表缓慢形变。这种方法能够提供大范围、大面积的形变监测。其中,StaMPS PS方法凭借适用范围广、开源等优点,受到众多学者的使用。但在时序InSAR中...时序分析是合成孔径雷达干涉测量(InSAR)的一项关键技术,它被广泛应用于监测广阔地区的地表缓慢形变。这种方法能够提供大范围、大面积的形变监测。其中,StaMPS PS方法凭借适用范围广、开源等优点,受到众多学者的使用。但在时序InSAR中,对流层延迟相位会导致形变监测精度的降低,因此,以合肥市为研究区域,分析了经验模型线性改正、GACOS(generic atmospheric correction online service for InSAR)改正和欧洲中期天气预报中心(ECMWF)最新发布的ERA5数据集改正,并对比这3种方法在时序InSAR反演形变速率中的改正效果。通过计算得到研究区的标准差,进行比较分析和验证。其中线性改正、ERA5和GACOS改正后的标准差分别降低了21.71%、16.14%、10.38%。对于合肥区域,这3种方法均可减弱对流层延迟的影响,且精度都有所提高,其中线性改正效果最好,适用性更高,ERA5和GACOS受天气以及地面监测点密度等影响,在该区域改正效果较差。展开更多
Fabrication of polyurethane molecular stamps (PU stamps) based on polypropylene glycol (PPG) and toluene diisocyanate (TDI), using 3, 3-dichloro-4, 4-methylenedianiline (MOCA) as the crosslinker, is reported. It wa...Fabrication of polyurethane molecular stamps (PU stamps) based on polypropylene glycol (PPG) and toluene diisocyanate (TDI), using 3, 3-dichloro-4, 4-methylenedianiline (MOCA) as the crosslinker, is reported. It was shown from the contact angle measurement that PU stamps surface has good affinity with acetonitrile, guaranteeing the well distribution of DNA monomers on patterned stamps. Laser confocal fluorescence microscopy images of oligonucleotide arrays after hybridization confirmed polyurethane is an excellent material for molecular stamps when transferring polar chemicals and conducting reactions on interfaces by stamping.展开更多
One in every four deaths in the United States is attributed to heart disease. While the ethnic variations have not been momentous, the socioeconomic disparities of heart disease incidence need to be further investigat...One in every four deaths in the United States is attributed to heart disease. While the ethnic variations have not been momentous, the socioeconomic disparities of heart disease incidence need to be further investigated. Moreover, exposure to air pollutants has been documented to cause heart disease. This secondary-data study investigates the effects of air pollutants as well as socioeconomic factors on hospitalization rate of heart disease in Texas. The rates for the five sub-diagnoses of cardiovascular disease, heart attack, stroke, hypertension and heart disease were linked to ozone, fine particulate matter, carbon monoxide, nitrogen dioxide, sulphur dioxide and socioeconomic status factors at the county level. These were college education attainment, households with female heads, percentage of users of food stamps, ethnicities, living near a park and living in houses with severe housing problems. Spatial lag modelling was conducted to estimate the statistical significance of the independent variables on the five sub-diagnoses of heart disease. Fine particulate matter, sulphur dioxide and being African American were significant to all the outcomes. Living in a household with female head was significant to stroke and hypertension. Using food stamps was significant to cardiovascular disease, heart attack and heart disease. Fine particulate matter and sulphur dioxide increase the risk of heart disease by a factor of three to twenty two times, respectively. Whereas low socioeconomic status increases the risk of heart disease by a factor of up to four times. The results of the effect of particulate air and sulphur dioxide pollution among people in low social class especially African Americans. The vicious cycle of heart disease and low socioeconomic status call for societal and policy makers’ attention through methodical interventions to address the two significant issues of industrial facilities site allocation and stationary emission resources.展开更多
On July 20, 2002, the State Postal Bureau issued a set of three stamps picturing the Qinghai Lake shore, Bird Island, and the distant view.Located on the northeastern Qinghai-Tibet Plateau, in West China’s Qinghai Pr...On July 20, 2002, the State Postal Bureau issued a set of three stamps picturing the Qinghai Lake shore, Bird Island, and the distant view.Located on the northeastern Qinghai-Tibet Plateau, in West China’s Qinghai Province, Qinghai Lake is 3,196 meters above sea level, and the biggest inland lake in China. Oils have been used to capture its magnificence.Bird Island on Qinghai Lake is展开更多
In July 2002, the State Postal Bureau issued a set of three stamps, whose theme is Antarctic scenery.The first stamp depicts an iceberg. Antarctica is where 90 percent of the world’s ice exists. Each year countless i...In July 2002, the State Postal Bureau issued a set of three stamps, whose theme is Antarctic scenery.The first stamp depicts an iceberg. Antarctica is where 90 percent of the world’s ice exists. Each year countless icebergs float majestically through the sea, and are a magnificent scenic feature of Antarctica.展开更多
The State Postal Bureau’s latest set of special stamps for 2003 features Eastern Zhou Dynasty (770-256 B,C.) bronzes. This eight-stamp set is the third to feature this type of relic; a set issued in 1964 depicted bro...The State Postal Bureau’s latest set of special stamps for 2003 features Eastern Zhou Dynasty (770-256 B,C.) bronzes. This eight-stamp set is the third to feature this type of relic; a set issued in 1964 depicted bronzes from the Yin Dynasty (14th-11th century}, and one featuring Western Zhou Dynasty (11th century-771 B.C.) bronzes was released in 1982.The Eastern Zhou Dynasty followed the Western, and during this period, bronze vessel casting developed remarkably. Artifacts from this period include sacrificial vessels, musical instruments, utensils, weapons and tools.One of these pieces, a rectangular tray decorated with tortoise and fish patterns, dates back to the late Spring and Autumn展开更多
文摘时序分析是合成孔径雷达干涉测量(InSAR)的一项关键技术,它被广泛应用于监测广阔地区的地表缓慢形变。这种方法能够提供大范围、大面积的形变监测。其中,StaMPS PS方法凭借适用范围广、开源等优点,受到众多学者的使用。但在时序InSAR中,对流层延迟相位会导致形变监测精度的降低,因此,以合肥市为研究区域,分析了经验模型线性改正、GACOS(generic atmospheric correction online service for InSAR)改正和欧洲中期天气预报中心(ECMWF)最新发布的ERA5数据集改正,并对比这3种方法在时序InSAR反演形变速率中的改正效果。通过计算得到研究区的标准差,进行比较分析和验证。其中线性改正、ERA5和GACOS改正后的标准差分别降低了21.71%、16.14%、10.38%。对于合肥区域,这3种方法均可减弱对流层延迟的影响,且精度都有所提高,其中线性改正效果最好,适用性更高,ERA5和GACOS受天气以及地面监测点密度等影响,在该区域改正效果较差。
基金supported by the Chinese 863 High-Tech Proiect973 National Key Fundamental Rescareh Project+3 种基金the National Natural Science Foundation of ChinaVisiting Scholar Foundation of Key lab.University of ChinaThe Jiangsu High-Tcch Projectthe Hangke Fund of Southeast University
文摘Fabrication of polyurethane molecular stamps (PU stamps) based on polypropylene glycol (PPG) and toluene diisocyanate (TDI), using 3, 3-dichloro-4, 4-methylenedianiline (MOCA) as the crosslinker, is reported. It was shown from the contact angle measurement that PU stamps surface has good affinity with acetonitrile, guaranteeing the well distribution of DNA monomers on patterned stamps. Laser confocal fluorescence microscopy images of oligonucleotide arrays after hybridization confirmed polyurethane is an excellent material for molecular stamps when transferring polar chemicals and conducting reactions on interfaces by stamping.
文摘One in every four deaths in the United States is attributed to heart disease. While the ethnic variations have not been momentous, the socioeconomic disparities of heart disease incidence need to be further investigated. Moreover, exposure to air pollutants has been documented to cause heart disease. This secondary-data study investigates the effects of air pollutants as well as socioeconomic factors on hospitalization rate of heart disease in Texas. The rates for the five sub-diagnoses of cardiovascular disease, heart attack, stroke, hypertension and heart disease were linked to ozone, fine particulate matter, carbon monoxide, nitrogen dioxide, sulphur dioxide and socioeconomic status factors at the county level. These were college education attainment, households with female heads, percentage of users of food stamps, ethnicities, living near a park and living in houses with severe housing problems. Spatial lag modelling was conducted to estimate the statistical significance of the independent variables on the five sub-diagnoses of heart disease. Fine particulate matter, sulphur dioxide and being African American were significant to all the outcomes. Living in a household with female head was significant to stroke and hypertension. Using food stamps was significant to cardiovascular disease, heart attack and heart disease. Fine particulate matter and sulphur dioxide increase the risk of heart disease by a factor of three to twenty two times, respectively. Whereas low socioeconomic status increases the risk of heart disease by a factor of up to four times. The results of the effect of particulate air and sulphur dioxide pollution among people in low social class especially African Americans. The vicious cycle of heart disease and low socioeconomic status call for societal and policy makers’ attention through methodical interventions to address the two significant issues of industrial facilities site allocation and stationary emission resources.
文摘On July 20, 2002, the State Postal Bureau issued a set of three stamps picturing the Qinghai Lake shore, Bird Island, and the distant view.Located on the northeastern Qinghai-Tibet Plateau, in West China’s Qinghai Province, Qinghai Lake is 3,196 meters above sea level, and the biggest inland lake in China. Oils have been used to capture its magnificence.Bird Island on Qinghai Lake is
文摘In July 2002, the State Postal Bureau issued a set of three stamps, whose theme is Antarctic scenery.The first stamp depicts an iceberg. Antarctica is where 90 percent of the world’s ice exists. Each year countless icebergs float majestically through the sea, and are a magnificent scenic feature of Antarctica.
文摘The State Postal Bureau’s latest set of special stamps for 2003 features Eastern Zhou Dynasty (770-256 B,C.) bronzes. This eight-stamp set is the third to feature this type of relic; a set issued in 1964 depicted bronzes from the Yin Dynasty (14th-11th century}, and one featuring Western Zhou Dynasty (11th century-771 B.C.) bronzes was released in 1982.The Eastern Zhou Dynasty followed the Western, and during this period, bronze vessel casting developed remarkably. Artifacts from this period include sacrificial vessels, musical instruments, utensils, weapons and tools.One of these pieces, a rectangular tray decorated with tortoise and fish patterns, dates back to the late Spring and Autumn
