AT 8 am, September 25, 2OLO, Apple＇s iPhone4 officially went on sale on the Chinese mainland market, and the much anticipated debut caused long lines of devotees to form at the doors of Apple＇s two flagship stores i...AT 8 am, September 25, 2OLO, Apple＇s iPhone4 officially went on sale on the Chinese mainland market, and the much anticipated debut caused long lines of devotees to form at the doors of Apple＇s two flagship stores in Beijing. Despite the high price, first stocks of this ＂must- have＂ gadget sold out completely. Why such pulling power？ The answer lies in the Apple brand, its cool industrial design and innovation.展开更多
SOUTH Africa＇s acute incidence of HIV/AI DS is well-known globally. According to the United Nations, about 6.1 million South Africans were living with HIV/ AIDS in 2012. This means that one in every six South African...SOUTH Africa＇s acute incidence of HIV/AI DS is well-known globally. According to the United Nations, about 6.1 million South Africans were living with HIV/ AIDS in 2012. This means that one in every six South Africans is infected and of these, 17.9 percent of indi- viduals between the ages of 15 and 49 - considered to be the most economically productive age group - are infected with HIV/AIDS. According to the World Bank, this high infection rate among the economically active population could, in the most undesirable of scenarios, result in South Africa＇s per-capita income halving by 2100. While still a few decades away, the projected adverse impact of HIV/AIDS on the South African economy has seen government embarking on the largest anti-retroviral treatment （ART） access cam- paign in the world.展开更多
FOR more than a quarter century, December 1 is observed as World AIDS Day - an international campaign by the World Health Organization （WHO） to raise awareness on the AIDS pandemic that has since the early 1980s acc...FOR more than a quarter century, December 1 is observed as World AIDS Day - an international campaign by the World Health Organization （WHO） to raise awareness on the AIDS pandemic that has since the early 1980s accounted for the death of at least 36 million people globally. According to the WHO, approximately 1.6 million people died of AIDS alone in 2012. Africa＇s more than 50 countries accounted for a disproportionate 75 percent of these deaths. They also hold about 65 percent of those living with HIV/AIDS, although home to only 15 percent of the world＇s popu- lation. With the world＇s fifth-highest HIV/AIDS prevalence rate, South Africa alone accounted for about 15 percent of deaths that year,展开更多
LI Tianyi is a busy seven-year-old. Besides her normal school work, she has to learn English, piano, Chinese calligraphy, painting and the International Mathematical Olympiads on Saturdays and Sundays. In summer and w...LI Tianyi is a busy seven-year-old. Besides her normal school work, she has to learn English, piano, Chinese calligraphy, painting and the International Mathematical Olympiads on Saturdays and Sundays. In summer and winter holidays she has no time to rest as her schedule demands still more extra classes.展开更多
Obtaining the vertical distribution profile of trace gas is of great significance for studying the diffusion procedure of air pollution.In this article,a look-up table method based on multi-axis differential optical a...Obtaining the vertical distribution profile of trace gas is of great significance for studying the diffusion procedure of air pollution.In this article,a look-up table method based on multi-axis differential optical absorption spectroscopy(MAX-DOAS)technology is established for retrieving the tropospheric NO_(2) vertical distribution profiles.This method retrieves the aerosol extinction profiles with minimum cost function.Then,the aerosol extinction profiles and the atmospheric radiation transfer model(RTM)are employed to establish the look-up table for retrieving the NO_(2) vertical column densities(VCDs)and profiles.The measured NO_(2) differential slant column densities(DSCDs)are compared with the NO_(2) DSCDs simulated by the atmospheric RTM,and the NO_(2) VCDs,the weight factor of NO_(2) in the boundary layer,and the boundary layer height are obtained by the minimization process.The look-up table is established to retrieve NO_(2) VCDs based on MAX-DOAS measurements in Huaibei area,and the results are compared with the data from Copernicus Atmospheric Monitoring Service(CAMS)model.It is found that there are nearly consistent and the correlation coefficient R2 is more than 0.86.The results show that this technology provides a more convenient and accurate retrieval method for the stereoscopic monitoring of atmospheric environment.展开更多
文摘AT 8 am, September 25, 2OLO, Apple＇s iPhone4 officially went on sale on the Chinese mainland market, and the much anticipated debut caused long lines of devotees to form at the doors of Apple＇s two flagship stores in Beijing. Despite the high price, first stocks of this ＂must- have＂ gadget sold out completely. Why such pulling power？ The answer lies in the Apple brand, its cool industrial design and innovation.
文摘SOUTH Africa＇s acute incidence of HIV/AI DS is well-known globally. According to the United Nations, about 6.1 million South Africans were living with HIV/ AIDS in 2012. This means that one in every six South Africans is infected and of these, 17.9 percent of indi- viduals between the ages of 15 and 49 - considered to be the most economically productive age group - are infected with HIV/AIDS. According to the World Bank, this high infection rate among the economically active population could, in the most undesirable of scenarios, result in South Africa＇s per-capita income halving by 2100. While still a few decades away, the projected adverse impact of HIV/AIDS on the South African economy has seen government embarking on the largest anti-retroviral treatment （ART） access cam- paign in the world.
文摘FOR more than a quarter century, December 1 is observed as World AIDS Day - an international campaign by the World Health Organization （WHO） to raise awareness on the AIDS pandemic that has since the early 1980s accounted for the death of at least 36 million people globally. According to the WHO, approximately 1.6 million people died of AIDS alone in 2012. Africa＇s more than 50 countries accounted for a disproportionate 75 percent of these deaths. They also hold about 65 percent of those living with HIV/AIDS, although home to only 15 percent of the world＇s popu- lation. With the world＇s fifth-highest HIV/AIDS prevalence rate, South Africa alone accounted for about 15 percent of deaths that year,
文摘LI Tianyi is a busy seven-year-old. Besides her normal school work, she has to learn English, piano, Chinese calligraphy, painting and the International Mathematical Olympiads on Saturdays and Sundays. In summer and winter holidays she has no time to rest as her schedule demands still more extra classes.
基金the National Natural Science Foundation of China(Grant No.41875040)the Top-notch Talents Program in Universities of Anhui Province,China(Grant No.gxbjZD2020067)the Natural Science Research Projects of Universities in Anhui Province,China(Grant No.KJ2020A0029).
文摘Obtaining the vertical distribution profile of trace gas is of great significance for studying the diffusion procedure of air pollution.In this article,a look-up table method based on multi-axis differential optical absorption spectroscopy(MAX-DOAS)technology is established for retrieving the tropospheric NO_(2) vertical distribution profiles.This method retrieves the aerosol extinction profiles with minimum cost function.Then,the aerosol extinction profiles and the atmospheric radiation transfer model(RTM)are employed to establish the look-up table for retrieving the NO_(2) vertical column densities(VCDs)and profiles.The measured NO_(2) differential slant column densities(DSCDs)are compared with the NO_(2) DSCDs simulated by the atmospheric RTM,and the NO_(2) VCDs,the weight factor of NO_(2) in the boundary layer,and the boundary layer height are obtained by the minimization process.The look-up table is established to retrieve NO_(2) VCDs based on MAX-DOAS measurements in Huaibei area,and the results are compared with the data from Copernicus Atmospheric Monitoring Service(CAMS)model.It is found that there are nearly consistent and the correlation coefficient R2 is more than 0.86.The results show that this technology provides a more convenient and accurate retrieval method for the stereoscopic monitoring of atmospheric environment.
