The two representative polycyclic musks, 1-（5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthenyl）-ethanone （AHTN） and 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[g]-2-benzopyrane （HHCB）, were measur...
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The two representative polycyclic musks, 1-（5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthenyl）-ethanone （AHTN） and 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[g]-2-benzopyrane （HHCB）, were measured in aqueous samples and sludge samples of three sewage treatment plants （STPs） in Beijing, China using a gas chromatograph-mass spectrometry. The HHCB and AHTN concentration ranges in the influents were 1251.4-3003.8 ng/L and 111.9-286.3 ng/L, respectively. Meanwhile, the ranges of 492.8-1285.3 ng/L for HHCB and 47.3-89.3 ng/L for AHTN were present in the effluents. The musks in the sludges were three to four orders of magnitude higher than those in aqueous sewages. The removal *** the two musks varied in the ranges of 41.7%- 70.1% for HHCB, and 25.5%-68.8% for AHTN. Adsorption onto suspended particulate matter played an important role in removing musks from the sewages. The HHCB/AHTN ratio along the treatment processes showed that the two musks had high similarity of removal from sewage by each reactor in STP. The musks in the effluent sewages may pose a low potential risk to aquatic environment in terms of the predicted-non-effect concentration. Nevertheless, considering the possible additive and synergistic effects with other compounds emitted via STPs, their bioconcentration and bioaccumulation in aquatic organisms and so on, it is essential to monitor these compounds in various compartments and to study their environmental fate.
Event-related potentials (ERPs) were conducted, in order to research brain functions associated with the effect of design for car models. The results demonstrated enhanced power in the ERPs by looking at the favorite ...
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Event-related potentials (ERPs) were conducted, in order to research brain functions associated with the effect of design for car models. The results demonstrated enhanced power in the ERPs by looking at the favorite car model. ERPs could be the electrophysiological index for checking the design effect of car models.
A two-stage comprehensive monitoring program was carried out in 2001 and 2008, which targeted the physical and chemical characteristics of particulate matter at Beijing roadsides. The effect of control measures on roa...
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ISBN:
(纸本)9781615676514
A two-stage comprehensive monitoring program was carried out in 2001 and 2008, which targeted the physical and chemical characteristics of particulate matter at Beijing roadsides. The effect of control measures on roadside particulate matter for the 2008 Beijing Olympic Games was studied. The stringent emission control measures (e.g., the odd/even days for the private vehicles, the ban on high-emitters) implemented during the Olympic games resulted in the reduction of direct PM emissions from on-road vehicles and re-suspended dust. Except for the control measures on transportation, the controls targeting power plants and industrial boilers helped cut SO2 and NOx, resulting in the reduction of secondary inorganic particles concentration. This is an abstract of a paper presented at the 102nd Air & Waste Management Association Annual Conference and Exhibition (Detroit, MI 6/16-19/2009).
The finite element model of a light bus body is established. The vibration modalities are evaluated using finite element software. The simulated results are compared with test date. It shows that the model has represe...
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With advantages of high efficiency and low cost, AMT (Automated Manual Transmission) has a very potential for auto-transmission, especially for heavy commercial vehicle, which has special requirements on low cost and ...
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Eco-compensation is an efficient method of environmental economic management on maintaining the function of ecosystem services. The eco-compensation standards are always determined according to the values of the ecosy...
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With the rapid economic development, the level of energy utilization is raising quickly, which results in a series of environmental problems. Urban ecosystem, as the major consumer of energy and key point of environme...
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The tests date to characterize the rubber material constants as well as the hyperelastic material stability is discussed. The rubber material of engine mount is analyzed based on different forms of strain energy poten...
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In tracking test, discharge is a complicated process and comparative tracking index (CTI) has wide varia-tion. To evaluate tracking resistance, the chaos analysis of discharge current is presented based on the trackin...
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In tracking test, discharge is a complicated process and comparative tracking index (CTI) has wide varia-tion. To evaluate tracking resistance, the chaos analysis of discharge current is presented based on the tracking test of phenolic resin in accordance with IEC60112. According to the characteristics of statistical self-similarity and complexity of discharge current, the largest Lyapunov exponent is calculated, and the 2-dimensional attractor of discharge current is reconstructed. Moreover, the attractors of discharge current and recurrence plots of different discharge states are reconstructed. The results indicate that the chaos attractors have different characteristics in evo-lutionary tracks, the topological structure and grain direction of recurrence plots show significant differences. The chaos attractor can describe the tracking process, the recurrence plot can identify the tracking state clearly, while its arithmetic is simple.
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