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  • Wang, Honglei  (89)
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  • 1
    Language: English
    In: Atmospheric Research, Feb, 2013, Vol.120-121, p.78(10)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.atmosres.2012.08.004 Byline: Hanqing Kang, Bin Zhu, Jifeng Su, Honglei Wang, Qiuchen Zhang, Fei Wang Keywords: Long-lasting haze pollution; Aerosol; Atmospheric boundary layer; Nanjing Abstract: A long-lasting haze episode occurred in Nanjing and its surrounding areas from October 15 to 31, 2009. Aerosol physical, chemical and optical properties during this pollution event were investigated. During the long-lasting haze, the Yangtze River Delta (YRD) region was under the control of a high-pressure system and surface pressure gradients were extremely small. The transport and diffusion of air pollutants were suppressed by very low surface wind speed, stably stratified atmosphere and lower mixing level depth (MLD). Back trajectory analysis showed that local emission and regional transport were important in this pollution process. The average diurnal variation of Aitken mode and coarse mode particles had bimodal distribution, which was mainly influenced by diurnal variation of atmospheric boundary layer (ABL) and anthropogenic emissions. Accumulation mode particles were mostly influenced by diurnal variation of ABL; while new particle formation process was important for nucleation mode particles. The peak value of aerosol particle number concentrations shifted to larger particle sizes, perhaps due to the fact that the haze was favorable to accumulation mode aerosols through collision and coagulation of Aitken mode particles. The high ratio of NO.sub.3.sup.-/SO.sub.4.sup.2- indicated that traffic source became more and more important in the YRD region. The average aerosol scattering coefficient was 696.7[+ or -]445.4Mm.sup.-1, mainly due to particle counts within diameter intervals from 0.6 to 1.4[mu]m that increased remarkably during the pollution process. Higher accumulation mode particle counts and higher relative humidity were the main reasons for atmospheric visibility impairment during the haze. Article History: Received 29 March 2012; Revised 23 June 2012; Accepted 1 August 2012
    Keywords: Planetary Boundary Layer -- Optical Properties ; Planetary Boundary Layer -- Analysis
    ISSN: 0169-8095
    Source: Cengage Learning, Inc.
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  • 2
    Language: English
    In: PLoS ONE, 01 January 2014, Vol.9(3), p.e92322
    Description: OBJECTIVE: To examine the relationship between the HW phenotype and risk for CKD in a community population aged 40 years and older. METHODS: A cross-sectional study was conducted in Zhuhai from June to October 2012. The participants were divided into three groups: Group 1, Waist circumference 〉90 cm in men or 〉85 cm in women and triglycerides ≥2 mmol/l; Group 3, Waist circumference ≤90 cm in men or ≤85 cm in women and triglycerides 〈2 mmol/l; Group 2, The remaining participants. The prevalence of the three subgroups and CKD were determined. The association between HW phenotype and CKD was then analyzed using SPSS (version 13.0). RESULTS: After adjusting for age and sex, Group 1 was associated with CKD (OR 3.08, 95% CI 2.01, 4.73, P〈0.001), when compared with Group 3. Further adjustment for factors which were potential confounders and unlikely to be in the causal pathway between the HW phenotype and CKD, Group 1 was still significantly associated with CKD. The OR for CKD was 2.65 (95% CI 1.65, 4.26, P〈0.001). When adjusted for diabetes and hypertension, the association of Group 1 and CKD was still significant (OR 2.09, 95% CI 1.26, 3.45, P = 0.004). Group 2 was associated with CKD (OR 1.81, 95% CI 1.29, 2.53, P = 0.001), when compared with Group 3. Further adjustment for factors which were potential confounders, Group 2 was still significantly associated with CKD. The OR for CKD was 1.75 (95% CI 1.22, 2.51, P = 0.002). When adjusted for diabetes and hypertension, the association between Group 2 and CKD still existed. The OR for CKD was 1.48 (95% CI 1.01, 2.16, P = 0.046). CONCLUSION: Our results showed that HW phenotype was associated with CKD in the population aged 40 years and older.
    Keywords: Sciences (General)
    E-ISSN: 1932-6203
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  • 3
    Language: English
    In: International Journal of Mass Spectrometry, Nov 1, 2013, Vol.353, p.12(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.ijms.2013.07.007 Byline: Qing Yang, Yongjun Hu, Yanchun Wei, Honglei Wang, Jiwen Guan, Yanjiao Zhang, Shaoxin Li Abstract: Author Affiliation: (a) MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, PR China (b) School of Basic Medicine, Guangdong Medical College, Dongguan 523808, PR China (c) School of Information Engineering, Guangdong Medical College, Dongguan 523808, PR China Article History: Received 15 March 2013; Revised 8 July 2013; Accepted 8 July 2013
    Keywords: Mass Spectrometry
    ISSN: 1387-3806
    Source: Cengage Learning, Inc.
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  • 4
    In: Nephrology, June 2014, Vol.19(6), pp.325-331
    Description: This cross‐sectional study of 1724 community‐based participants in Southern China assesses the presence of metabolic syndrome and shows its association with CKD. The identification of predictors for CKD can lead to strategies such as excercise and weight reduction to reduce adverse outcomes and may help to delay the development and progression of CKD.
    Keywords: Chronic Kidney Disease ; Metabolic Syndrome ; Outhern Hinese Population
    ISSN: 1320-5358
    E-ISSN: 1440-1797
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  • 5
    Language: English
    In: Energy & Buildings, April, 2012, Vol.47, p.612(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.enbuild.2011.12.038 Byline: Na Deng, Xiaohui Yu, Yufeng Zhang, Hongting Ma, Honglei Wang Keywords: Direct cooling system; Double-wells water circulation; Vertical U-shaped ground heat exchanger; Underground sink; Numerical analysis Abstract: a* We present three kinds of direct cooling system and establish numerical models. a* The characteristics of three systems is compared and analyzed. a* The double-wells circulating system remains long-term, safe and stable operation and is recommended as a prior way. a* The heat transfer effect of U-shaped tube system is relatively poor. a* The underground sink system is recommended as an auxiliary cooling system. Author Affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China Article History: Received 10 July 2011; Revised 26 October 2011; Accepted 26 December 2011
    Keywords: Energy Management -- Case Studies ; Energy Management -- Analysis ; Cooling Systems -- Case Studies ; Cooling Systems -- Analysis
    ISSN: 0378-7788
    Source: Cengage Learning, Inc.
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  • 6
    Language: English
    In: The journal of physical chemistry. B, 09 February 2017, Vol.121(5), pp.1041-1053
    Description: Molecular dynamics simulations were used to investigate the transport properties of water-methanol solution getting through a carbon nanotube (CNT) with an oscillating electric field. Eight alternating electric fields with different oscillation periods were used in this work. Under the oscillating electric field, water molecules have the advantage of occupying a CNT over methanol molecules. Meanwhile, the space occupancy of water-methanol solution in the CNT increases as the oscillating period increases. More importantly, we found that the oscillating period of electric field affects the van der Waals interaction of the solution inside the CNT and the shell of the CNT, which results in the change in the number of hydrogen bonds in the water-methanol solution confined in the CNT. And the change in the hydrogen-bond network leads to the change in transport properties of water-methanol solution.
    Keywords: Carbon Nanotubes ; Electric Fields ; Methyl Alcohol ; Simulation ; Molecular Dynamics ; Transport Properties ; Oscillating ; Hydrogen Bonds ; Miscellaneous Sciences (So) ; Analysis (MD) ; Chemical Analysis (Ep) ; Chemical Analysis (Ed) ; Chemical Analysis (EC);
    ISSN: 15206106
    E-ISSN: 1520-5207
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  • 7
    Language: English
    In: Science of the Total Environment, 15 April 2018, Vol.621, pp.507-515
    Description: A more precise atmospheric extinction coefficient would be advantageous for improving air quality (visibility) forecasting. In this study, the size distribution, chemical composition and relative humidity were measured in Lin'an from January 9 to 31, 2015. The merits and weaknesses of three parameterization schemes are discussed in this paper, including the non-linear fitting scheme, the IMPROVE (Interagency Monitoring of Protected Visual Environment) algorithm and the κ-elemental carbon (EC)-Mie model. Comparing the three schemes mentioned above, we find that the non-linear fitting equation requires the least amount of data, and its calculation process is the simplest. However, its calculated values are significantly influenced by specific data and fitting formulas. The uncertainty of the variable coefficients makes it difficult to directly implement this method for other datasets. The calculated values of the three versions of the IMPROVE algorithm strongly correlate with the measured values, with slopes near 1.0 and statistical indexes (R ) of 0.848, 0.858 and 0.866. However, this method is affected by the chemical compositions of the particles in different regions; for example, when the quality of PM is reconstructed from the measured data, the coefficients of different components change, thus affecting the final results. The κ-EC-Mie model objectively reflects the changes in the law of visibility, as the model considers both the chemical composition and size distribution of particles, and its predominant merit is derived from the fact that it is calculated without an empirical formula, which may eliminate the computational errors caused by the uncertainties of coefficients.
    Keywords: Atmospheric Extinction Coefficient ; Parameterization Schemes ; Κ-EC-Mie Model ; Improve Algorithm ; Pm2.5 ; Visibility ; Environmental Sciences ; Biology ; Public Health
    ISSN: 0048-9697
    E-ISSN: 1879-1026
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  • 8
    Language: English
    In: Science of the Total Environment, 15 September 2016, Vol.565, pp.1175-1184
    Description: Aerosol number size distribution in the range of 10 nm–10 μm, trace gases (O , CO, SO and NO ), particular matter (PM: PM and PM ) and meteorological elements were measured from the 1st to the 31st of May, 2015, in the coastal city of Jiaxing in the Yangtze River Delta (YRD). The average number concentration and surface area concentration were 19,639 cm and 427 μm cm during the observation period. The different mode particle concentrations ranked in the order of Aitken mode (12,361 cm ) 〉 nucleation (4926.7 cm ) 〉 accumulation (2349.3 cm ) 〉 coarse mode (1.7 cm ). The average concentrations of CO, SO , NO , O , PM and PM were 0.545 mg m , 14.7, 35.1, 89.8, 43.5 and 64.6 μg m , respectively. Eight precipitation processes and 15 new particle formation (NPF) events (3 NPF events occurred on a rainy day) were observed. Results show that the precipitation process had greater scavenging effects on particles smaller than 120 nm and larger than 2 μm. The spectral distributions of number concentrations were unimodal at different weather conditions, with peaks at 20 nm, 40–60 nm, 50–80 nm on NPF days, rainy days and normal days. During the NPF events, the formation rate (FR), growth rate (GR), condensational sink (CS), vapor source rate (Q) and condensing vapor concentration (C) were in the range of 4.0–17.0 cm s , 2.2–15.7 nm h , 1.5–5.8 × 10 s , 0.5–7.7 × 10 cm s and 3.0–21.5 × 10 cm , with mean values of 9.6 cm s , 6.8 nm h , 3.4 × 10 s , 3.3 × 10 cm s and 9.4 × 10 cm , respectively. NPF events normally occurred under clean atmospheric conditions with low PM concentrations but high levels of trace gases. It was also found that SO plays an important role in NPF and growth in Jiaxing.
    Keywords: Coastal City ; Aerosol Number Concentration ; New Particle Formation ; Trace Gases ; Size Distribution ; Environmental Sciences ; Biology ; Public Health
    ISSN: 0048-9697
    E-ISSN: 1879-1026
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  • 9
    Language: English
    In: Atmospheric Environment, April 2018, Vol.178, pp.1-10
    Description: The mixing state of aerosol particles were investigated using a single particle aerosol mass spectrometer (SPAMS) during a regional fog-haze episode in the Yangtze River Delta (YRD) on 16–28 Dec., 2015. The aerosols were analyzed and clustered into 12 classes: aged elemental carbon (Aged-EC), internally mixed organics and elemental carbon (ECOC), organic carbon (OC), Biomass, Amine, Ammonium, Na-K, V-rich, Pb-rich, Cu-rich, Fe-rich and Dust. Results showed that particles in short-term rainfalls mixed with more nitrate and oxidized organics, while they mixed with more ammonium and sulfate in long-term rainfall. Due to anthropogenic activities, stronger winds and solar radiation, the particle counts increased and the size ranges of particles broadened in haze. Carbonaceous particles and Na-K mixed with enhanced secondary species during haze, and obviously were more acidic, especially for the ones with a size range of 0.6–1.2 μm. For local and long-range transported pollution, OC had distinct size distributions while the changes of ECOC were uniform. The secondary formation of ECOC contributed significantly in local pollution and affected much smaller particles (as small as 0.5 μm) in long-range transported pollution. And long-range transported pollution was more helpful for the growth of OC. Particles mixed with more chloride and nitrate/sulfate in local/long-range transported pollution.
    Keywords: Mixing State ; Fog-Haze ; Single Particle Aerosol Mass Spectrometer ; The Yangtze River Delta ; Engineering ; Environmental Sciences
    ISSN: 1352-2310
    E-ISSN: 1873-2844
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  • 10
    Language: English
    In: Journal of Cleaner Production, 15 April 2017, Vol.149, pp.436-447
    Description: Strict pollution-control measures were implemented in Jiaxing and surrounding regions in China during the 2015 2nd World Internet Conference (WIC) to ensure good air quality. To investigate the variations of air pollutants and the sources and mixing state of size-resolved aerosols in response to the emission controls, trace gases (O , SO , NO , and CO), particulate matter (PM and PM ), and single particle aerosols were measured in Jiaxing, China during December 11–25, 2015. During the WIC (from 00:00 on Dec. 16 to 16:00 on Dec. 18, 2015), the average concentrations of PM , PM , NO , and CO in Jiaxing were 38.7, 75.0, and 43.5 μg m and 0.7 mg m and were decreased by 62.1%, 47.1%, 31.2%, and 41.7% and 60.0%, 45.7%, 34.7%, and 41.7% compared to before and after the WIC, respectively. These changes were caused mainly by strict measurement of traffic restrictions and industrial emission reductions. By using the single particle aerosol mass spectrometer (SPAMS), 8,350,772 particles with aerodynamic diameters ranging from 0.2 to 2.0 μm were identified. Of these particles, 877,397 were successfully ionized. The aerosol particles collected for SPAMS data analysis employed 96.0% of the hit particles to recognize 5 major particle classes: K-rich particles (K-CN, K-Secondary, and K-mixed Elemental Carbon (K-EC)), sodium particles, carbon-rich particles (EC-Nitrate, EC-Secondary, and Organics and Elemental Carbon (OCEC)), ammonium particles, and heavy-metal particles (Fe-Secondary, Pb, and Cu-V). Signals from 23[Na] were uniformly observed among these 11 types of particles, which may have been affected by sea salt particles in the coastal city of Jiaxing. During the WIC, the proportions of K-EC (4.5%), EC-Secondary (2.0%), Fe-Secondary (1.9%), EC-Nitrate (0.5%), and Ammonium (0.7%) decreased, the proportions of K-CN (15.2%), OCEC (27.5%), and Cu-V (16.8%) increased significantly, and the proportions of K-Secondary (17.2%), sodium (11.6%), and Pb (2.0%) changed slightly. During the WIC, the peaks representing different particle classes shifted to fine particle segments at 0.5–0.6 μm, and the peak width was relatively narrowed compared to before and after the WIC. The reduction of air pollutant emissions significantly influenced the K-CN, OCEC, Cu-V, EC-Secondary, Fe-Secondary, and K-EC particles with sizes of 0.4–1.4 μm. The information obtained on variations of air pollutants, the mixing state, and the temporal variation of particle types is essential for developing an understanding of air quality assurance control for subsequent WICs and of the origin and evolution processes of atmospheric aerosols.
    Keywords: 2nd World Internet Conference ; Mixing State ; Air Pollutants ; Source ; Jiaxing ; Engineering
    ISSN: 0959-6526
    E-ISSN: 1879-1786
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