Time filter

Source Type

He W.,National Climate Center | Feng G.,National Climate Center | Wu Q.,National Satellite Meteorological Center | He T.,Jinan Environmental Monitoring Center | And 2 more authors.
International Journal of Climatology | Year: 2012

On the basis of detrended fluctuation analysis (DFA), a new method, moving cut data-DFA (MC-DFA), was presented to detect abrupt dynamic change in correlated time series. The numerical tests show the capability of the presented method to detect abrupt change time-instants in model time series generated by Logistic map. Moving DFA (MDFA) and approximate entropy (ApEn) can provide some information such as a single time-instant of abrupt dynamic change, but both of them cannot exactly detect all of the abrupt change regions. Some traditional methods, such as moving t-test, Cramer method, Mann-Kendall test and Yamamoto method, even cannot provide any information of abrupt dynamic change in these model time series. Meanwhile, results showed that windows sizes and strong noise have some less effect on the MC-DFA results. In summary, MC-DFA provides a reliable measure to detect the abrupt dynamic change in correlated time series, and perfectively make up the deficiencies of MDFA and ApEn. The applications in daily surface air pressure records further verify the validity of the present method. © 2011 Royal Meteorological Society.


Yang J.,Shandong University | Cui N.,Shandong University of Traditional Chinese Medicine | Wang H.,Centers for Disease Control and Prevention | Tao Z.,Centers for Disease Control and Prevention | And 12 more authors.
Virus Genes | Year: 2012

Echovirus 11 (E11) is an important human pathogen, but its genetic information in China is in scarce. In this study, 12 sewage samples from Jinan city and 18 from Linyi city were collected in Shandong Province, China in 2010, and E11 was the predominant serotype with 54 isolates from 16 samples. Numbers of E11 isolates reached peaks in August in both Jinan and Linyi city, while another peak occurred in December in Linyi. The complete VP1 genes of all these isolates were sequenced and phylogenetically compared with clinical isolates from Shandong in 1994-2010 (n = 29) and global E11. Shandong isolates segregated into five clusters, four in genogroup A and one in genogroup C. Environmental isolates belonged to two clusters of genogroup A, with high inter-cluster genetic divergence (18.5-20.9%). No local clinical E11 was isolated in the two cities in 2010, revealing the value of environmental surveillance in investigating circulating viruses. These findings underscored the significance of environmental VP1 sequence divergences in comprehending the local enterovirus circulation, and updated the global molecular epidemiology of E11. © Springer Science+Business Media, LLC 2012.


Cheng H.-Y.,Yancheng Institute of Technology | He W.-P.,National Climate Center | He T.,Jinan Environmental Monitoring Center | Wu Q.,National Satellite Meteorological Center
Wuli Xuebao/Acta Physica Sinica | Year: 2012

For a stable dynamic system, probability density distribution (PDD) of a system variable is relatively stable, and if there is a change in dynamic structure of a system, the PDD of the system variable will have some change correspondingly. According to this characteristic of PDD of a dynamic system, in this paper we present two new methods, namely, skewness index and kurtosis index, to detect an abrupt change in a time series by means of identifying some small changes in PDD. Tests on model time series indicate that skewness index and kurtosis index can be used to identify an abrupt change, such as abrupt change in parameter of an equation and abrupt dynamic change. Thus, we provide a new approach to detecting abrupt change in time series based on PDD. Further studies show that the detected results of the skewness index and kurtosis index are almost independence of the length of a subseries. © 2012 Chinese Physical Society.


Lidong W.,North China Electrical Power University | Lidong W.,Tsinghua University | Yongliang M.,Tsinghua University | Wendi Z.,North China Electrical Power University | And 3 more authors.
Journal of Hazardous Materials | Year: 2013

Magnesia flue gas desulfurization is a promising process for small to medium scale industrial coal-fired boilers in order to reduce sulfur dioxide emissions, in which oxidation control of magnesium sulfite is of great importance for the recycling of products. Effects of four inhibitors were compared by kinetic experiments indicating that ascorbic acid is the best additive, which retards the oxidation process of magnesium sulfite in trace presence. The macrokinetics of magnesium sulfite oxidation inhibited by ascorbic acid were studied. Effects of the factors, including ascorbic acid concentration, magnesium sulfite concentration, oxygen partial pressure, pH, and temperature, were investigated in a stirred reactor with bubbling. The results show that the reaction rate is -0.55 order in ascorbic acid, 0.77 in oxygen partial pressure, and zero in magnesium sulfite concentration, respectively. The apparent activation energy is 88.0kJmol-1. Integrated with the kinetic model, it is concluded that the oxidation rate of magnesium sulfite inhibited by ascorbic acid is controlled by the intrinsic chemical reaction. The result provides a useful reference for sulfite recovery in magnesia desulfurization. © 2013 Elsevier B.V.


Du J.,Liaocheng University | Xu Z.,Liaocheng University | Deng B.,Jinan Environmental Monitoring Center | Chu R.,Liaocheng University | And 3 more authors.
Ceramics International | Year: 2014

(Na0.52K0.45Li0.03)1-3xLa x(Nb0.88Sb0.09Ta0.03)O3 (NKLLxNST) lead-free ceramics were prepared by normal sintering and their dielectric and piezoelectric properties were investigated. The X-ray methods indicate that the NKLLxNST ceramics with x≤0.003 present a pure perovskite phase at room temperature. The bulk density of NKLL xNST ceramics increases with proper amount of La2O 3 contents, and reaches its highest value of 4.544 g/cm3 with the addition of 0.3 mol% La2O3. At x=0.003, remnant polarization Pr, piezoelectric constant d33 and planar mode electromechanical coupling factor kp of NKLLxNST ceramics reach the highest values of 37.80 μC/cm2, 346 pC/N and 40%, respectively, exhibiting excellent "soft" piezoelectric characteristics, demonstrating a tremendous potential of the compositions studied for device applications. © 2013 Elsevier Ltd and Techna Group S.r.l.


Liu Z.C.,Shandong Jianzhu University | Cheng H.J.,Shandong Jianzhu University | Ge X.,Jinan Water Supply and Drainage Monitoring Center | Zhang G.Q.,Shandong Jianzhu University | And 2 more authors.
Advanced Materials Research | Year: 2013

Atmospheric particulate samples of seven sites in Jinan city weres collected by intelligent and middle flow TSP sample (TH-150C). Methods were employed to extract Polycyclic Aromatic Hydrocarbons (PAHs) from atmospheric particulate matter, including accelerated solvent extraction, revolving evaporation, silica column filtration and nitrogen blowing apparatus. Also, the Gas Chromatogram - Mass Spectrum (GC-MS) detection technology was adopted to determine the concentrations of PAHs. The mass concentration and total concentration of 16 PAHs in the particulates were obtained in the ambient air of selected seven sites in Jinan city. According to the detection datum, the pollution characteristics and Spatio-Temporal distribution patterns of these PAHs were discussed. The analysis results demonstrated that the variation pattern of the total amount of these 16 PAHs was winter season> autumn season > spring season > summer season in one year. Moreover, comparison to the total concentration of 16 PAHs collected in the seven sites during non heating period, Zhangqiu had the highest PAHs level and the Monitoring Station of Jinan city had the lowest PAHs level. However, during both the sandstorm period and heating period, Changqing occupied the highest PAHs level and Paoma Ling had the lowest PAHs level. In addition, the total amount levels of the 16 PAHs in ambient particulates of the seven sites have identical patterns: non heating period < sandstorm period < heating period. However, the total concentration of PAHs during the heating period was much higher than those during both sandstorm and non heating periods. Besides, the structure of PAHs in ambient particulates in Jinan city was mainly based on middle-and-high rings. Therefore, the monitoring and prevention of middle-andhigh rings structures of PAHs should be emphasized in Jinan city in future. © (2013) Trans Tech Publications, Switzerland.


Liu P.,Shandong University | Yue M.,Shandong University | Zhang H.,Jinan Environmental Monitoring Center
Journal of Chemistry | Year: 2016

The withered Phragmites australis (PA) surrounding the rivers can cause the secondary pollution of water. In this research, by changing the ratio (R) of ammonium polyphosphate (APP), used as flame retardant, to PA at different temperatures, a series of BC samples were prepared for further analysis in several perspectives, namely, surface morphologies, surface areas, surface functional groups, and yields. The analysis indicated that, after being charred, the produced BCs obtained enhanced yields and promoted surface acidity. As adsorbent to remove Ni(II) from aqueous solutions, the BCs with APP improved the sorption of Ni(II) dramatically, compared with those purely produced by pyrolysis of PA, and obtained the maximum of adsorption capacity with the R of 0.25 at 400°C. © 2016 Peng Liu et al.


Zhu L.,Soochow University of China | Peng L.,Jinan Environmental Monitoring Center | Zhang Y.-Q.,Soochow University of China
Mini-Reviews in Medicinal Chemistry | Year: 2015

The formation of peritoneal adhesions represents one of the most common complications after abdominal surgery, and it increases the difficulty of re-operation. Thus, preventing postoperative adhesions is a major problem in the field of surgical medicine. Due to a lack of good predictive animal models and the complexity of adhesion pathogenesis, attempts to prevent or reduce peritoneal adhesions have been largely unsuccessful. As a result, the study of anti-adhesion drugs and materials has become a hot topic for experts and scholars. The processing and development of chitosan and its derivatives as new anti-adhesion materials is highly valued because chitosan is inexpensive, highly biocompatible, and not cytotoxic, making it a promising anti-adhesion material. Here, we review the sources and preparation of chitosan and the progress made toward producing different types of chitosan and its derivatives for preventing adhesion. © 2015 Bentham Science Publishers.


Hou L.,Jinan Environmental Monitoring Center | Hou L.,Jinan Academy of Environmental science | Liu Y.,Jinan Environmental Monitoring Center | Liu Y.,Jinan Academy of Environmental science | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

The effects of fine particle (PM2.5), organic carbon (OC), elemental (EC), volatile organic compound (VOC) concentrations and meteorological factors on visibility in Jinan were analyzed on the basis of monitoring results from January 1 to December 31, 2011. The atmosphere relative humidity and PM2.5 concentration were found to be the main factors, which both exhibit exponential or logarithmic relationship with the visibility. The relation between PM2.5 concentration and visibility was then established by the relative empiric formulas, combined with different ranges of relative humidity. The validation of the formulas was conducted by using the data from June 1 to November 30 in 2010, and the results show that the empiric formulas have good practical value.


He T.,Jinan Environmental Monitoring Center | Hou L.,Jinan Environmental Monitoring Center | Lu B.,Jinan Environmental Monitoring Center | Liu Y.,Jinan Environmental Monitoring Center
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2013

The results of comparison observation experiments between the 355 nm lidar and BAM-1020 particulate monitor laid on a 325 m tower of the Institute of Atmospheric Physics of the Chinese Academy of Sciences are given. Based on the data from 21 September 2011 to 21 October, good correlation between aerosol extinction coefficient by the lidar and PM2.5 particulate matter concentration is found. The linear regression model to establish the relationship between the extinction coefficient and the particulate matter concentration is used. The data of PM2.5 concentration measured by monitor laid on tower is used to study the inversion accuracy of the relational expression on the vertical height. The study results show that the correlation coefficients between lidar inversion PM2.5 and the measured values at 63, 80, 120 and 160 m are 0.9447, 0.9331, 0.9284 and 0.9308, respectively. The result shows that the lidar can detect the vertical distribution of particles. The lidar will be beneficial to study the spatial distribution and cross-border transportation problems of pollutants, as well as provide data to support policies and measurements of joint prevention and control of regional atmospheric.

Loading Jinan Environmental Monitoring Center collaborators
Loading Jinan Environmental Monitoring Center collaborators