Hu M.,Nanjing Southeast University |
Wu J.,Zhejiang Urban and Rural Planning Design Institute |
Zhu X.,Monash University
Journal of Southeast University (English Edition) | Year: 2015
As the traditional methods and technical means cannot meet the quantitative research needs of the urban land use patterns, quantitative research methods for the urban land use pattern are established via the GIS (geographic information system) technique combined with the related theories and models. Taking the city of Nanjing as an example, a spatial database of urban land use and other environmental and socio-economic data is constructed. A multiple linear regression model is developed to determine the statistically significant factors affecting the residential land use distributions. To explain the spatial variations of urban land use patterns, the geographically weighted regression (GWR) is employed to establish spatial associations between these significant factors and the distribution of urban residential land use. The results demonstrate that the GWR can provide an effective approach to the exploration of the urban land use spatial patterns and also provide useful spatial information for planning residential development and other types of urban land use. ©, 2015, Southeast University. All right reserved.
Zhao X.,Nanjing Southeast University |
Ren G.,Nanjing Southeast University |
Zhang L.,Zhejiang Urban and Rural Planning Design Institute
Journal of Beijing Institute of Technology (English Edition) | Year: 2012
Based on the theory of planned behavior (TPB), an initial attemptwas made to analyze the unsafe bicycle riding behavior in China from the perspective of social psychology. It tries to figure out the psychological factors of bicycle riders such as attitude towards unsafe bicycle riding, subjective norm, perceived behavioral control and behavioral experience, with an aim to establish unsafe bicycle riding behavior model through adding variables by means of questionnaire. From the structural model analysis of survey data and personal attributes, it can be found that respondent, who do not have a clear understanding of unsafe behavior, are likely to violate the law and they did commit some unsafe behavior before. Meanwhile, population that is most likely to commit unsafe acts is determined. Finally, based on the link between psychological factors and behavior, several means of behavioral modification are proposed: family-style safety education, strengthening the management of policemen as well as setting examples. © right.
Lu W.,Tsinghua University |
Zhu Y.,Zhejiang Urban and Rural Planning Design Institute |
Long Y.,Tsinghua University |
Long Y.,Zhejiang GongShang University |
And 5 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2012
Moisture content is the main factor affecting biodegradation process as well as leachate production in bioreactor landfills. In the study, two types of polyacrylamide (PAM) water retention agents which are commercially available were selected. One is a water-soluble PAM agent designated as WSN20 and the other is a water-insoluble PAM agent designated as JB. Both were applied into landfill medium to study their function on water retention and the biological activity enhancement. During the degradation process, the variation of moisture content, quantity and quality of leachate, landfill gas and electron transport system (ETS) activity in the simulated landfill reactors were determined. Result showed that dosage and type of PAM had significant impact on the water retention property and biological activity of landfill. Water retention agent of appropriate dosage could reduce the quantity of leachate production and improve its quality simultaneously. JB showed better effect than WSN20. When the dosage of JB was 0.1% (wt/wt), the moisture content and ETS activity in the waste increased by 12% and 3.3 times, respectively, while the production of leachate significantly decreased.
Chen Y.,Tongji University |
Ni L.H.,Zhejiang Urban and Rural Planning Design Institute |
Dai X.L.,Zhejiang University of Technology
Advanced Materials Research | Year: 2012
In the history, water towns in the southeast of China had undergone a traffic mode change from waterborne traffic to road traffic. This research took Tong-li as an example, explored how this change has its effect on various aspects of the town: spatial structure, land-use distribution and the emerged and went down of commercial streets. The method applied here are literature review, historical map analysis, site observation and space syntax. It is found that the changing traffic mode has an far-reaching impact on the pedestrian network of Tong-li.
Lu W.-Z.,Zhejiang Urban And Rural Planning Design Institute |
Tao H.-B.,Zhejiang University |
Zhu Y.-J.,Zhejiang Institute of Communications |
Liu G.-B.,Ningbo University
Yantu Lixue/Rock and Soil Mechanics | Year: 2013
It is difficult for modelling 3D strata if different stratigraphic sequences exist among the boreholes. The problem can be solved through following method: deducing the inferior tables of stratigraphic sequences from the main table of stratigraphic sequences which is provided by the survey data with the information of the boreholes, have different stratigraphic sequences from the main table, is the first step. The main table and the other tables become a group of tables of stratigraphic sequences. The relationship that a borehole belongs to which table of the group can find out by using spatial probability analysis and the corresponding relationships between boreholes and tables then are set up. The problems of connecting the boreholes which have different stratigraphic sequences change into the problem of connecting the different tables. A technique that can be used to automatically figure out the corresponding relationship between two tables by searching for maximum count of same stratum is put forward. With this technique, all the tables in the group can be combined into a final table. Basing on it, the algorithm for building layer model is set up. At last, the validation of this algorithm is proved by using it in modelling 3D strata of the slope at Zhu-Yong expressway section K120+030~K120+300.
Zhang H.-F.,Zhejiang University |
Guan F.-L.,Zhejiang University |
Hou G.-Y.,Zhejiang Urban and Rural Planning Design Institute
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2010
A failure model of the truss deployable antenna was established using faulty tree theory, and based on which failure probability formulations for the antenna system were deduced using probability theory. Deployment analysis formulations for truss deployable antenna were established using dynamic theory. The deployment process of the antenna was analyzed when there were torsional spring failures at different positions, then those positions where the antenna could not deploy fully or the surface error was very high when torsional springs failed were obtained, and those positions where the antenna could deploy smoothly and the surface error was low when torsional springs failed were also obtained. Combining these results and reliability analysis, the reliability of deployable truss antenna can be analyzed accurately. Finally, the reliability degree of truss deployable antenna was analyzed with an example, and the result is 0.999 787 571.
Tang X.,Zhejiang University |
Hou B.,Zhejiang University |
Yu C.,Zhejiang Urban and Rural Planning Design Institute |
Pan Q.,Zhejiang Urban and Rural Planning Design Institute |
And 2 more authors.
Chinese Journal of Sensors and Actuators | Year: 2010
A novel scheme that makes use of improved level set extract roads in high-resolution remote sensing images (RS) is proposed. The traditional level set methods for image segmentation are computational expensive due to the re-initiation and the methods always only use the gray value as input information. To solve these problems, the proposed approach introduces a distance regularizing term into the CV model, and utilizes both gray features and each channel of HSI model to construct a new level set evolution function without re-initialization. Furthermore, a framework of dividing large images into sub-images is designed according to the size of the RS images. It makes the roads ' objects lie in fewer images, and reduces the noises from the background. The proposed approach was tested by the QuickBird RS images at 0.61 m resolution and two numeral indexes were defined to evaluate the results. Results show that the presented approach reduces the influence of area noises and is able to extracts the roads precisely. These make it be a valuable and promising method for decision-making in transportation.
Xin K.,Tongji University |
Tao T.,Tongji University |
Wang Y.,Zhejiang Urban and Rural Planning Design Institute |
Liu S.,Tongji University
Frontiers of Environmental Science and Engineering in China | Year: 2012
In this paper, it proposed an index system for hazard and vulnerability evaluations of water distribution networks, based on the simulation of contamination events caused by pollutant injections at different junctions. It attempted to answer the following two questions in the case of contamination events: 1) Which are the most hazardous junctions? 2) Which are the most vulnerable junctions? With EPANET toolkit, it simulated the propagation of the contaminant, and calculated the peak concentration of the contaminant and mass delivered at different nodes. According to types of consumers, different weights were assigned to the consumer nodes for assessing the influence of the contaminant on the consumers. Using the method proposed herein, both the hazard index and vulnerability index were calculated for each node in the pipe network. The presented method was therefore applied to the water network of the city of Zhenjiang, which contains two water plants, two booster pump stations with storage tanks. In conclusion, the response time, the relationships between the peak concentration of contaminant and the total absorption are the most important factors in hazard and vulnerability evaluation of the water distribution network. © 2012 Higher Education Press and Springer-Verlag Berlin Heidelberg.