BTX (benzene, ethylbenzene, toluene and p-xylene) and meteorological parameters were measured in ambient air of an urban site located in Carmen City, Campeche, Mexico. A total of 412 samples were collected for BTX and...BTX (benzene, ethylbenzene, toluene and p-xylene) and meteorological parameters were measured in ambient air of an urban site located in Carmen City, Campeche, Mexico. A total of 412 samples were collected for BTX and analyzed by Gas Chromatography with Flame Ionization Detection (GC-FID). Meteorological parameters were measured by a portable station. A marked diurnal variation was found for all measured BTX. The highest concentrations occurred during midday (13:00-14:30 h). A clear seasonal pattern was observed too for all compounds registering their highest levels during summer sampling period. Mean concentrations for benzene, ethylbenzene, toluene and p-xylene were: 5.42, 3.97, 11.24 and 8.32 ppbv, respectively. BTX abundance showed the following order: toluene > p-xylene > benzene > ethylbenzene. BTX maximum concentrations were found when winds blowed from E and NE. Important oil industry sources and avenues are located at these directions. These sources could contribute to the levels of BTX in this site.展开更多
No opera has as lasting performances as Carmen has and no opera has nicer melody than Carmen which suits both refined and common tastes.Carmen, a charming Gypsy girl with wild but unbending nature, has once been admir...No opera has as lasting performances as Carmen has and no opera has nicer melody than Carmen which suits both refined and common tastes.Carmen, a charming Gypsy girl with wild but unbending nature, has once been admired by so many people. And the artistic forms originating from Carmen, including Carmen’s opera, films dance, literature and philosophy, have made people feel the huge glamour and artistic appeal of the artistic figure.Shanghai will have a new chapter in its展开更多
在美国,音箱的种类可谓琳琅满目,种类繁多。而这也使得Amp市场中的产品鱼龙混杂,参差不齐。不过我们有时也能从中发现一些非常好的产品。比如位于Essex的Peach Music公司就为我们推出了一款非常出色的音箱头Dr.Z Carmen GbSa。 Z博士(原...在美国,音箱的种类可谓琳琅满目,种类繁多。而这也使得Amp市场中的产品鱼龙混杂,参差不齐。不过我们有时也能从中发现一些非常好的产品。比如位于Essex的Peach Music公司就为我们推出了一款非常出色的音箱头Dr.Z Carmen GbSa。 Z博士(原名:Mike Zaite)是俄亥俄州人。展开更多
文摘BTX (benzene, ethylbenzene, toluene and p-xylene) and meteorological parameters were measured in ambient air of an urban site located in Carmen City, Campeche, Mexico. A total of 412 samples were collected for BTX and analyzed by Gas Chromatography with Flame Ionization Detection (GC-FID). Meteorological parameters were measured by a portable station. A marked diurnal variation was found for all measured BTX. The highest concentrations occurred during midday (13:00-14:30 h). A clear seasonal pattern was observed too for all compounds registering their highest levels during summer sampling period. Mean concentrations for benzene, ethylbenzene, toluene and p-xylene were: 5.42, 3.97, 11.24 and 8.32 ppbv, respectively. BTX abundance showed the following order: toluene > p-xylene > benzene > ethylbenzene. BTX maximum concentrations were found when winds blowed from E and NE. Important oil industry sources and avenues are located at these directions. These sources could contribute to the levels of BTX in this site.
文摘No opera has as lasting performances as Carmen has and no opera has nicer melody than Carmen which suits both refined and common tastes.Carmen, a charming Gypsy girl with wild but unbending nature, has once been admired by so many people. And the artistic forms originating from Carmen, including Carmen’s opera, films dance, literature and philosophy, have made people feel the huge glamour and artistic appeal of the artistic figure.Shanghai will have a new chapter in its
