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Mechanism of Ce promoting SO2 resistance of MnOx/γ-Al2O3: An experimental and DFT study
Xiaopeng Zhang,Zhuofeng Li,Jijun Zhao,Yuezong Cui,Bojian Tan,Jinxin Wang,Chengxiang Zhang,Gaohong He 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.7
Various physico-chemical techniques and theoretical chemistry computations are used to obtain a deep insight into the mechanism of Ce improving SO2 resistance of the catalyst Mn0.4Cex/Al2O3 (x stands for the molar ratio of Ce : Al). Theoretical computation with density functional theory (DFT) shows that Ce modification enhances the adsorption energy of SO2 adsorbed on Ce surrounding, resulting in the preferential adsorption of SO2 on Ce surrounding. It protects the surface Mn from SO2 poisoning, leading to a better SO2 resistance. FT-IR and TG results are in good accordance with DFT results. FT-IR results suggest that absorption peaks related to SO4 2− cannot be detected in Mn0.4Ce0.12/Al2O3. Moreover, TG results show that weight loss peaks due to sulfated MnOx decomposition disappears after Ce addition. Therefore, Ce modification inhibits sulfates formation on active components lead to a better resistance to SO2 of Mn0.4Ce0.12/Al2O3.
A Heuristic-Based Population Synthesis Method for Micro-Simulation in Transportation
Chengxiang Zhuge,Xia Li,Chia-An Ku,Jian Gao,Hui Zhang 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.6
Population synthesis is extensively required by a number of micro-simulation models in transportation. A heuristic-based population synthesis method called Pop-H was proposed to overcome the following two limitations that received less attention. The first limitation is that one target marginal distribution can be well met by various sets of household weights that can be used to generate different sets of population and thus it is a problem that which set of household weights is the real one. Secondly, the population synthesis is commonly viewed as an optimization problem, and minimizing the Mean Absolute Percentage Error of control variables is generally used as the objective function. The Standard Deviation of control variables is also crucial in some cases, which, however receives scant attention. In response to these two limitations, the heuristic-based population synthesis method works in the following way: the Pop-H algorithm starts with the initial set of household weights derived from a sample data and calculates the final set of household weights by iteratively adjusting the initial set in a defined way with the objective function taking into account both Mean Absolute Percentage Error and Standard Deviation of control variables. Finally, the medium-sized city of Baoding, China was used as the case study. The sensitivity test was firstly done to examine four key parameters of the Pop-H algorithm, and then the algorithm was applied to create the population for the whole city.
Sphingobacterium wenxiniae sp. nov., a cypermethrin-degrading species from activated sludge
Zhang, Jun,Zheng, Jin-Wei,Cho, Byung Cheol,Hwang, Chung Yeon,Fang, Chengxiang,He, Jian,Li, Shun-Peng Microbiology Society 2012 International journal of systematic and evolutiona Vol.62 No.3
<P>A Gram-negative, non-motile, non-spore-forming, non-flagellated rod capable of degrading cypermethrin, designated LQY-18<SUP>T</SUP>, was isolated from activated sludge of a wastewater treatment plant in China. Strain LQY-18<SUP>T</SUP> grew at 8-40 °C (optimum 30 °C), at pH 5.0-10.0 (optimum pH 7.0) and with 0-5 % (w/v) NaCl (optimum 1 %). The predominant menaquinone was MK-7 (97 %) and the major fatty acids were summed feature 3 (comprising C16 : 1ω6<I>c</I> and/or C16 : 1ω7<I>c</I>), iso-C15 : 0 and iso-C17 : 0 3-OH. The DNA G+C content was 40.3 mol%. Phylogenetic analysis revealed that the isolate belonged to the genus <I>Sphingobacterium</I> of the phylum <I>Bacteroidetes</I> and showed low 16S rRNA gene sequence similarity with recognized members of the genus <I>Sphingobacterium</I>. The closest neighbour was <I>Sphingobacterium mizutaii</I> ATCC 33299<SUP>T</SUP> (92.9 % 16S rRNA gene sequence similarity). On the basis of phenotypic, genetic and phylogenetic data, strain LQY-18<SUP>T</SUP> ( = ACCC 05410<SUP>T</SUP> = CCTCC AB 2010005<SUP>T</SUP> = KCTC 23009<SUP>T</SUP>) should be classified as a representative of a novel species of the genus <I>Sphingobacterium</I>, for which the name <I>Sphingobacterium wenxiniae</I> sp. nov. is proposed.</P>
Detecting Taxi Travel Patterns using GPS Trajectory Data: A Case Study of Beijing
Hui Zhang,Baiying Shi,Chengxiang Zhuge,Wei Wang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.4
GPS trajectory is a valuable source to understand the operational status of taxicabs and identify the traffic demand and congestions. This study attempts to use 24-hour taxi trajectory data to investigate the attributes of taxicabs such as the distance of occupied distance, number of active taxicabs in different hours, average trip speed in different hour, coverage area of a taxicab, average radius of a taxicab, occupied rate and service times. The results show that the highest speed of taxicabs occur in the 3:00 am when there is the smallest number of active taxicabs running on the road. Moreover, the average occupied rate is 0.59 and the average service times are 19.8 in a day. Finally, a latent class analysis model is used to make the segment of taxicabs by their attributes. Four operational patterns have been found including ‘downtown preference type’, ‘long-distance preference type’, ‘suburbs preference type’ and ‘free preference type’. This study can shed light on understanding the operational status of taxicabs and gives suggestions for operators and passengers for better managing and using taxicabs.
Xu, Anying,Lin, Changqi,Hou, Chengxiang,Zhang, Yuehua,Li, Muwang,Sun, Pingjiang Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.13 No.1
The major dominant fluoride-endurance (Dfe) gene was introduced into the commercial varieties by crossing and pedigree selection to breed silkworm races that could normally develop in the area that polluted by fluoride. After backcrossed for two generations, the Dfe gene was made homozygous, and individuals with good economic characters were selected to generate next generation. After 8 generations of selection, their characters became stable, and the silkworm variety which is resistant to fluoride, Huayuan${\times}$Dongsheng, for spring rearing were bred.