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Search Results: 1 - 10 of 60847 matches for " Shuyuan Yu "
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 American Journal of Computational Mathematics (AJCM) , 2012, DOI: 10.4236/ajcm.2012.24046 Abstract: In the paper, an improved algorithm is presented for Delaunay triangulation of the point-set in the plain. Based on the original algorithm, we propose the notion of removing circle. During the process of triangulation, and the circle dynamically moves, the algorithm which is simple and practical, therefore evidently accelerates the process of searching a new point, while generating a new triangle. Then it shows the effect of the algorithm in the finite element mesh.
 Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105406 Abstract: The potential health hazards of trihalomethanes (THMs) contamination in drinking water in Shenzhen were estimated. The concentrations of THMs in drinking water from 13 centralized water supply systems were determined from Jan 2015 to Dec 2016 in Shenzhen. The water environmental health risk assessment model recommended by USEPA was established based on the water monitoring data of THMs. Preliminary health risks of THMs through ingestion of drinking water were assessed. The median concentrations of THMs, TCM, DBCM, BDCM and TBM in drinking water were 37.0, 24.5, 2.3, 7.8 and 0.3 μg/L respectively. The values of carcinogenic risks for THMs, TCM, DBCM, BDCM, and TBM to the individual per year in drinking water were 4.52 × 10-5, 2.38 × 10-5, 6.07 × 10-6, 1.52 × 10-5 and 7.45 × 10-8 respectively. The values of non-carcinogenic risks for THMs, TCM, DBCM, BDCM and TBM to the individual per year in drinking water were 9.32 × 10-2, 7.68 × 10-2, 3.61 × 10-3, and 1.23 × 10-2 and 4.71 × 10-4 respectively. The health risk caused by THMs to the individual through ingestion of drinking water was in the order of TCM, BDCM, DBCM and TBM from high to low. The carcinogenic risks induced by THMs through ingestion of drinking water are acceptable with tolerable value offered by USEPA (1.0 × 10-6 - 1.0 × 10-4), but reached to the tolerable value (5.0 × 10-5) by International Commission on Radiological Protection (ICRP). The non-carcinogenic risk of THMs is tolerable (HI < 1).
 International Journal of Biomedical Imaging , 2011, DOI: 10.1155/2011/210428 Abstract: A finite element mesh aggregating approach is presented to reconstruct images of multiple internal bioluminescence sources. Rather than assuming independence between mesh nodes, the proposed reconstruction strategy exploits spatial structure of nodes and aggregation feature of density distribution on the finite element mesh to adaptively determine the number of sources and to improve the quality of reconstructed images. With the proposed strategy integrated in the regularization-based reconstruction process, reconstruction algorithms need no a priori knowledge of source number; even more importantly, they can automatically reconstruct multiple sources that differ greatly in density or power.
 - , 2016, Abstract: 土地覆被分类系统是城市景观研究的基础。近年来对地观测技术发展迅速，遥感影像的质量与分辨率有了极大的提升，为土地覆被的研究提供了强大的基础数据，而科学合理的分类系统则是土地覆被研究的前提。根据不同的研究目的和遥感数据的特点，各国学者先后提出构建不同层次不同类型的土地覆被或土地利用分类系统，但迄今仍没有一个为国际学术界广泛认可和具有普适性的分类系统。本文基于多光谱与全色波段融合后的2 m分辨率高分一号影像数据，依据地物自然属性、形态及光谱特征，提出了一个适用于城市区域的土地覆被分类系统，并以广州市为例图示了分类结果。该分类系统着重于城市生态系统的特点，为非重叠的层级体系，第一、二层级有固定的类别与依据，第三层级为开放性层级。其中一级类别划分为建成区、植被、水体和裸地4类，二级类别分别划分为商住区、工业区、道路；林地、灌从、草地、农田；河流、库塘等9类。分类结果包含二级类别的全部土地覆被类型，总体精度达到90.1%，符合技术要求，具有推广意义
 Open Journal of Geology (OJG) , 2012, DOI: 10.4236/ojg.2012.22007 Abstract: Thermal simulation experiments on the system of gasoline and magnesium sulfate were carried out using an autoclave operating at high temperature and high pressure in the presence of water. Properties of the gas-oil-solid 3-phase products were analyzed by some advanced analytical methods including gas chromatography, microcoulometry, capillary gas chromatography in combination with a pulsed flame photometric detector, FT-IR and X-ray diffraction. The results showed that the reaction could proceed at 450℃ - 550℃ to produce MgO, S, C, H2S, CO2 and a series of organic sulfides such as mercaptans, sulfoethers and thiophenes as the main products. According to the reaction kinetics, the calculated activation energy of the reaction is 68.9 kJ·mol-1.
 PLOS ONE , 2013, DOI: 10.1371/journal.pone.0060822 Abstract: Tai people are widely distributed in Thailand, Laos and southwestern China and are a large population of Southeast Asia. Although most anthropologists and historians agree that modern Tai people are from southwestern China and northern Thailand, the place from which they historically migrated remains controversial. Three popular hypotheses have been proposed: northern origin hypothesis, southern origin hypothesis or an indigenous origin. We compared the genetic relationships between the Tai in China and their “siblings” to test different hypotheses by analyzing 10 autosomal microsatellites. The genetic data of 916 samples from 19 populations were analyzed in this survey. The autosomal STR data from 15 of the 19 populations came from our previous study (Lin et al., 2010). 194 samples from four additional populations were genotyped in this study: Han (Yunnan), Dai (Dehong), Dai (Yuxi) and Mongolian. The results of genetic distance comparisons, genetic structure analyses and admixture analyses all indicate that populations from northern origin hypothesis have large genetic distances and are clearly differentiated from the Tai. The simulation-based ABC analysis also indicates this. The posterior probability of the northern origin hypothesis is just 0.04 [95%CI: (0.01–0.06)]. Conversely, genetic relationships were very close between the Tai and populations from southern origin or an indigenous origin hypothesis. Simulation-based ABC analyses were also used to distinguish the southern origin hypothesis from the indigenous origin hypothesis. The results indicate that the posterior probability of the southern origin hypothesis [0.640, 95%CI: (0.524–0.757)] is greater than that of the indigenous origin hypothesis [0.324, 95%CI: (0.211–0.438)]. Therefore, we propose that the genetic evidence does not support the hypothesis of northern origin. Our genetic data indicate that the southern origin hypothesis has higher probability than the other two hypotheses statistically, suggesting that the Tai people most likely originated from southern China.
 Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810026760 Abstract: In the title molecule [systematic name: 12,15-dibromo-52,53,55,56-tetramethyl-3,7-dithia-1,5(1,4)-dibenzenacyclooctaphane], C20H22Br2S2, the distance between the centroids of the two benzene rings is 3.326 (4) , and their mean planes are almost parallel, forming a dihedral angle of 1.05 (7)°. The crystal packing exhibits no intermolecular contacts shorter than the sum of van der Waals radii.
 Contributions to Discrete Mathematics , 2006, Abstract: Given any rational numbers \$r geq r' >2\$ and an integer \$g\$, we prove that there is a graph \$G\$ of girth at least \$g\$, which is uniquely \$r\$-colourable and uniquely \$r'\$-fractional colourable.
 Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.23035 Abstract: Objective: To understand the general self-efficacy of full-time and part-time counseling staff in primary and secondary schools. Methods: 108 counseling staff from primary and secondary schools in Foshan City were selected using multi-stage random sampling method, and investigated by self-made questionnaire, Simplified Coping Style Questionnaire (SCSQ) and General Self-Efficacy Scale (GSES). Results: Different academic staff had different positive coping styles scores (P < 0.05). People with Master’s degree and above selected more mature way than that of college staff, and people with lower educational level (2.56 ± 0.34, 2.02 ± 0.40, P < 0.05); People with different jobs showed different negative coping styles and self-efficacy (P < 0.01); Score of negative coping styles of part-time staff was higher than that of full-time staff(1.21 ± 0.59, 0.94 ± 0.36), while their sense of self-efficacy was lower than that of full-time staff (2.51 ± 0.49, 2.83 ± 0.39). However there was no statistical difference among people from different majors and jobs on positive coping styles, negative coping styles and self-efficacy (P > 0.05). High self-efficacy group had higher scores of positive coping styles than that of low self-efficacy group (2.17 ± 0.36，1.97 ± 0.43, P < 0.05); Positive correlation had been found between self-efficacy and positive coping styles (r = 0.307, P < 0.01). Conclusion: Self-efficacy of counseling staff in primary and secondary schools is related to positive coping styles and job styles kinds (full-time or part-time).
 微生物学报 , 2009, Abstract: Abstract: Spiroplasma spp. are helical, motile bacteria that lack cell wall and flagellum, and are enclosed within a single membrane with their genomes ranging from approximately 0.78-2.20 Mb in size, the smallest among known self-replicating prokaryotes. So they have been used as model organisms for studying movement, metabolisms and sex ratio. Currently, 34 serological groups are recognized; three of these groups encompass 15 subgroups of inter-related strains. To date, 37 species among all serogroups and subgroups have been given binomial names. Complete characterization of a new species involves numerous phenotypic and genotypic tests as outlined in the minimal standards document, including phylogenetic data and a reevaluated set of required phenotypic and genotypic tests. Spiroplasma spp. are most often found in association with insects and plants flowers, and the interactions of Spiroplasma/host can be classified as commensal, pathogenic or mutualistic. Investigation of spiroplasma resources in China and research on their biodiversity will undoubtedly improve our understanding of these important microbial resources.
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