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Search Results: 1 - 10 of 120206 matches for " Changsheng Wang "
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Radio Coverage Mapping in Wireless Sensor Networks  [PDF]
Yunfeng Nie, Chongyi Chen, Changsheng Wang
Wireless Sensor Network (WSN) , 2014, DOI: 10.4236/wsn.2014.610020
Abstract: Radio coverage directly affects the network connectivity, which is the foundational issue to ensure the normal operation of the network. Many efforts have been made to estimate the radio coverage of sensor nodes. The existing approaches (often RSSI measurement-based), however, suffer from heavy measurement cost and are not well suitable for the large-scale densely deployed WSNs. NRC-Map, a novel algorithm is put forward for sensor nodes radio coverage mapping. The algorithm is based on the RSSI values collected by the neighbor nodes. According to the spatial relationship, neighbor nodes are mapping to several overlapped sectors. By use of the least squares fitting method, a log-distance path loss model is established for each sector. Then, the max radius of each sector is computed according to the path loss model and the given signal attenuation threshold. Finally, all the sectors are overlapped to estimate the node radio coverage. Experimental results show that the method is simple and effectively improve the prediction accuracy of the sensor node radio coverage.
Gravel Image Auto-Segmentation Based on an Improved Normalized Cuts Algorithm  [PDF]
Chao Wang, Xiangliang Lin, Changsheng Chen
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.73044
Abstract: The study of the grain-size distribution of gravels is always an important and challenging issue in stratigraphy and morphology, especially in the field of automated measurement. It largely reduces many manual processes and time consumption. Precise segmentation method plays a very important role in it. In this study, a digital image method using an improved normalized cuts algorithm is proposed for auto-segmentation of gravel image. It added grain-size estimation, and used the feature vector based on color. It has made great improvements in many respects, especially in accuracy of edge segmentation and automation. Compared with manual measurement methods and other image processing methods, the method studied in this paper is an efficient method for precisely segmenting gravel images.
New discovery on dinosaur fossils from Early Jurassic, Sichuan, China
Yaonan Luo,Changsheng Wang
Chinese Science Bulletin , 1999, DOI: 10.1007/BF03182705
Abstract: An early and primitive sauropod dinosaur,Gongxianosaurus shibeiensis (gen. et sp. nov.), from Lower Jurassic Dongyuemiao Member of Ziliujing Formation in Shibei Village, Gongxian County, Sichuan Province, China is described, which is among Gongxian dinosaur fossils discovered in 1997. Except for skull incomplete, fossils were well-preserved. It has concurrently some features of both sauropod and prosauropds. It is an intermediate type of evolution from prosauropod to sauropod, provides practical materials for stueing of origin and evolution of sauropod dinosaur fauna, and a favourable way for stratigraphic correlation between Early Jurassic Ziliujing Formation and Lower Lufeng Formation, in the Sichuan Basin and the Central Yunnan Basin that lies to its southwest.
Toxic Effects of Nano-CuO, Micro-CuO and Cu2+ on Chlorella sp.  [PDF]
Liyan Wang, Mian Wang, Changsheng Peng, Jinfen Pan
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.41B016

The 96 h acute toxic effects of nano-CuO (N-CuO), micro-CuO (M-CuO) and 2+ on Chlorella sp. were investigated in this paper. The results showed that toxicities decreased in an order of Cu2+>N-CuO>M-CuO. The 96 h EC50 of Cu2+ on Chlorella sp. was 1.06 mg /L, and of N-CuO it was 74.61 mg /L, while no pronounced toxicity was observed when the concentration of M-CuO was lower than 160 mg/L. Further experiments were carried out in order to study the toxicity mechanism of nano-CuO on Chlorella sp.. The results of Cu2+ release from N-CuO showed less than 0.2 mg/L Cu2+ were released, so the release of Cu2+ was not responsible for the toxicity. Further experiments showed N-CuO inhibited formation of Chlorophyll A. Content of Chlorophyll A in the control group was 4.75 mg/108 cells, while it declined to 2.89 mg/108 cells for 160 mg/L N-CuO after 96 h, which indicated that N-CuO could inhibit photosynthesis of Chlorella sp.. Moreover, N-CuO condensed with algal cells. It affected the activity of SOD and POD, indicating that N-CuO could cause oxidant stress to Chlorella sp.. These may be the toxicity mechanism.

A Paraquat Tolerance Mutant in Rice (Oryza sativa L.) Is Controlled by Maternal Inheritance  [PDF]
Nianhao Shih, Dagin Lin, Chingyuh Wang, Changsheng Wang
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.910152
Abstract: Paraquat (1,1’-dimethyl-4,4’-bipyridinium) tolerance is an important trait in the weed control during crop production. The paraquat tolerant (Pq72) and susceptible (Pq1192) mutants are pure lines derived from the mutation pool of rice cultivar TNG67. Two reciprocal crosses, Pq72/Pq1192 and Pq1192/Pq72, were conducted between Pq72 and Pq1192 mutant lines for studying the genetic of paraquat tolerance by investigations of physiological characteristics related to paraquat tolerance including leaf injury index, leaf chlorophyll fluorescence (Fv/Fm) and electrolyte leakage in the F2 populations of two reciprocal crosses after paraquat treatment. The results suggested that a maternal inheritance of paraquat tolerance is existed in these mutants. Further analysis found that the F2 population of Pq72/Pq1192 segregated 3:1 (tolerant to susceptible) in both Fv/Fm and electrolyte leakage, respectively. This result implies that the paraquat tolerance of the Pq72 mutant is controlled by a single dominant gene.
Exploration on the Application-oriented Talent Training Mode of Biological Engineering  [PDF]
Yan Guo, Changsheng Qiao, Dongguang Xiao, Min Wang, Shiru Jia, Ning Chen, Zhilei Tan
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.37B038
Abstract: Aiming at the existing problems on professional talent training mode of bio-engineering in China ,with the guidance of scientific concept of development ,combining with the development status and trends, talent training objectives and mode of bio-engineering industry in China, basing upon the district of Binhai new area, This paper introduces the useful explorations on professional bio-engineering talent training mode of College of Biotechnology in Tianjin University of Science & Technology.
Structural investigation of the zirconium-titanium based amino trimethylene phosphonate hybrid coating on aluminum alloy

Shuanghong WANG,Changsheng LIU,Fengjun SHAN,

金属学报(英文版) , 2009,
Abstract: A zirconium-titanium based amino trimethylene phosphonate hybrid coating on AA6061 aluminum alloys was formed by dipping in a fluorotitanate/zirconate acid and amino trimethylene phosphonic acid (ATMP) solution for improving the lacquer adhesion and corrosion resistance as a substitute of chromate coatings. The morphol-ogy and structure of the hybrid coating were studied by means of scanning electror microscopy (SEM) and atomic force microscopy (AFM). The surface compositior and structure characteristics were also investigated by means of X-ray photoelectron spectroscopy (XPS) and Fourier transformation infra-red spectroscopy (FTIR). The results of SEM and AFM show that the hybrid coating present piece particle distrib-ution which is much denser than that of the zirconium-titanium coating. The results of XPS and FTIR indicate that the hybrid coating is a hybrid composite structure composed of both the zirconium-titanium and amino trimethylene phosphonate coat-ings.
Influence of meteorological factors on the seasonal onset of esophagogastric variceal bleeding  [PDF]
Jun Chen, Donghua Li, Shaoyong Xu, Zequn Sun, Bin Wang, Changsheng Deng
Open Journal of Gastroenterology (OJGas) , 2013, DOI: 10.4236/ojgas.2013.32022

Purpose: To investigate the influence of meteorological factors on the esophagogastric variceal bleeding. The rhythmicity and variation mechanism of the onset of esophagogastric variceal bleeding were determined by large sample study. Methods: 572 patients with esophagogastric variceal bleeding confirmed by endoscopy were enrolled in the study, and the gender, age, onset date and Child-Pugh grading of liver function were recorded, the meteorological data were provided by the Shiyan Meteorological Bureau, which included temperature, air pressure, air speed, precipitation, sunshine duration and so on. Results: The onset numbers in the four seasons were 130, 122, 144 and 176, respectively, and differences of the onset number in different seasons were significant (X2 = 11.888, p = 0.008), and the onset number in winter reached to maximum, while it decreased to minimum in summer. The results of Child-Pugh grading were as follows: Grade A 113 (19.8%), Grade B 234 (40.9%), and Grade C 225 (39.3%). There was no significance among the different grades by crosstabs analysis (X2 = 4.463, p = 0.107). The Spearman correlation analysis concluded the result of (r > 0 and p < 0.01) in the air pressure (mean, maximal and minimal), daily mean temperature, ten days’ air pressure (mean, daily difference, maximal, minimal and range), ten days’ temperature range on the onset day, while the result of (r < 0 and p < 0.01) in the daily maximal temperature, daily minimal temperature, ten days’ temperature (mean, maximal and minimal) and ten days’ ≥0?C accumulated temperature. The p value was more than0.01 inthe other factors. Conclusion: The onset of esophagogastric variceal bleeding was rhythmical, which rose to the maximum in winter and decreased to minimum in summer. The onset of the disease correlated positively with daily air pressure (mean, maximal, minimal), daily mean temperature, ten days’ air pressure (mean, daily difference, maximal, minimal and

Fast Determination of Vitamin B2 Based on Molecularly Imprinted Electrochemical Sensor  [PDF]
Peidong Xu, Changsheng Qiao, Shufeng Yang, Lijuan Liu, Mingwei Wang, Juankun Zhang
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B034
Under the condition of weak acidity of pH 5.2, a sensitive vitamin B2 electrochemical sensor based on molecularly imprinted nonconducting polymer of o-aminophenol by potentiostatic polymerization in the presence of template(vitamin B2) on a glassy carbon electrode was prepared, and its performance was studied. The sensor exhibited good sensitivity and selectivity to VB2. The detection limit went down to 2.3851nM, and a linear relationship between the current incremental and the concentration was found in the range of 10~120nM. And the sensor could use in detection of VB2 real sample for a long time and show good reproducibility. The average recovery rate to VB2 was 98.41%.
Convection effect on dendritic growth using phase-field method
Zhu Changsheng,Wang Zhiping,Gui Jin
China Foundry , 2010,
Abstract: Phase-field model was employed to quantitatively study the effect of convection on pattern selection and growth rate of 2D and 3D dendrite tip, as well as the effect of the different convection velocity on the dendritic growth. The calculated results show that crystal is asymmetric in the priority direction of growth under flow. The dentritic growth is promoted in the upstream region and suppressed in the downstream region. Convection can cause deviation in the dendrite growth direction and the preferred direction of the columnar crystals. It has been found that both primary dendrite stem and secondary dendrite arm deflect significantly towards upstream direction, secondary dendrite arm in upstream direction is more developed than the primary dendrite in downstream direction.
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