Natural Resources and Economic Development in the Western Regions of ChinaLi, Ju; Xiao, Dan
doi: 10.1088/1755-1315/237/5/052001pmid: N/A
This paper examines the impact of natural resources on economic development in western China. The provincial panel data from 2005 to 2016 were analyzed using time series analysis and fixed effect regression models. It reveals the correlation between natural resources and economic development in the western region. The results show that water resources, cultivated land resources, natural resource reserves and natural resource development are positively related to economic development; forest resources are negatively correlated with economic development. Studies have shown that water resources, cultivated land resources, natural resource reserves and natural resource development have played a certain role in promoting economic development in the western region, while forest resources have hindered economic development in the western region.
Aeromagnetic anomalies interpretation based on improved bi-dimensional empirical mode decomposition (BEMD) and RGB compositionMa, Min; Wang, Chunhui; Li, Xuan; Gao, Quan; Gong, Weiguo; Shi, Shuxiao
doi: 10.1088/1755-1315/237/5/052002pmid: N/A
In this study, the bi-dimensional empirical mode decomposition (BEMD) technique is improved by morphological extrema reconstruction, kriging interpolation and self-adaptive termination condition to make the decomposed components more robust. The decomposed components is a self-adaptive and data-driven dyadic filter bank. The high pass filter BIMF1 is about shallow or subsurface faults, it is an indirect indication to polymetallic deposits, especially tectonic-hydrothermal ones. The band pass filter BIMF2 is about regional anomalies from the middle-shallow or mantle-crustal, it is especially indicative to contact-metasomatic deposits. The low pass filter BIMF3+Residue is the shape of deep source trend of mantle magmatic crystalline basement. As they are independent and the original magnetic data can be reconstructed by their summation, they are taken as R, G, and B component and composited as an image, which retains all characters of the filters and shows ore-prospecting areas. The BEMD-RGB algorithm in this way makes aeromagnetic anomalies easier to interpret and more geologically meaningful. The whole process is performed on MATLAB 2010b platform automatically.
Spatial Heterogeneity of Soil Moisture and Vegetation Cover in Shiyang River Basin, Northwest ChinaWei, Wei; Xie, Binbin; Zhang, Xueyuan; Zhang, Jing
doi: 10.1088/1755-1315/237/5/052003pmid: N/A
Landsat TM remote sensing images were used to calculate and analysis distribution characteristics of soil moisture and vegetation cover in Shiyang River Basin in 2010. According to the images and reference to the general method, the vegetation index of Shiyang River Basin was divided into bare land, sparse vegetation, moderate vegetation and lush vegetation. Besides, the direct effects of different soil moisture on vegetation cover were also analyzed according to the spatial distribution characteristics of soil water. The results showed that the ecological environment in Shiyang River Basin was further deteriorating in the past, the production capacity of land was decline in the research period.
Monitoring Broadleaf Forest Pest Based on L-Band SAR TomographyCao, Kunkun; Tan, Weixian; Li, Xinwu; Xu, Wei; Huang, Pingping; Fu, Wenxue; Liang, Lei; Li, Xiujuan; Peng, Xing
doi: 10.1088/1755-1315/237/5/052004pmid: N/A
Synthetic aperture radar tomography (TomoSAR) has been proved to be able to reconstruct 3D reflectance of volumetric targets, such as vegetation. It gives us an opportunity and a possibility to monitor forest pest through extracting 3D structural information of the forest. In this paper, TomoSAR echo data of normal and pest forest are simulated with PolSAR Pro at L-band before and after the pest respectively, after analysing physical geometry and backscattering properties of forest pest and disease. Then, a method used for extracting 3D structure information of the forest is presented and discussed. Finally, differences between the normal and pest forest are demonstrated and analyzed with the TomoSAR imaging results.
Anomalous Diffusion of Active Brownian Particles in Crystalline PhasesWang, Jiwei
doi: 10.1088/1755-1315/237/5/052005pmid: N/A
By performing a molecular-dynamics model of active Brownian particles in 2D geometry and systematically changing the system densities, an investigation of the diffusion of active Brownian particles from homogeneous fluid phases to hexagonal-packed crystalline phases is presented. It is found that particle diffusion is short-time superdiffusive and long-time Fickian, where the effective diffusion coefficient decreases with the increasing density. Such behavior can be theoretically captured by a modified overdamped Langevin equation. On the other hand, the displacement distribution of active Brownian particles in dilute suspensions is identified to be governed by the classic diffusion equation. However, dynamic heterogeneity emerges for the fluctuations of systems in crystalline phases, where the tail of van Hove function is found to follow the exponential distribution instead of the Gaussian form. Such anomalous phenomena perhaps could be attributed to the dense environments where the distribution of particle diffusivity is non-uniform. Our findings potentially provide a significant advance in revealing the fundamental nonequilibrium physics of active matter systems.
Research on Tourism Economic Development from the Perspective of Ecological Security: A Case Study of Xi’anJun, Yangxiao; Zi, Houye; Shan, Fangchuan
doi: 10.1088/1755-1315/237/5/052006pmid: N/A
The research on the process of interaction between urban ecological security and tourism economy has a positive impact on the coordinated development of population, society, economy and environment. Taking Xi’an as an example, this paper uses the data from 2010 to 2015 to construct an evaluation index system, determines the weight based on the entropy method, and uses the coordinated development model to evaluate and analyse the coordinated development level of ecological security and tourism economy in Xi’an. The results show that the comprehensive evaluation index of tourism economy and ecological security in Xi’an from 2010 to 2015 is on the rise, and the type of coordinated development presents an obvious stage development, from the declining recession in 2010-2011 to the coordinated development in 2012-2015. There is a benign interaction and coordinated development relationship between the tourism economy and the ecological security system.
Study of Agro-soil & water System State of High Quality Apple Planting District in Dry Northern Weihe Loess PlateauYan, Baowen; Li, Xianwen; Song, Songbai
doi: 10.1088/1755-1315/237/5/052007pmid: N/A
The dry North Weihe Loess Plateau is the most splendid climatic district for apple to grow in China. Take Baishui county as an instance, beginning with the structure of Agro-soil & water system for apple growing, this paper analyses the relationships between the elements of Agro-soil & water and the factors of apple quality in this representative small district, thus selecting the elements which are suitable to assess the Agro-soil & water system state. After setting up the assessment system of Agro-soil & water system via AHP method, the Agro-soil & water system state in Baishui country is assessed, through which the preponderance Agro-soil & water environment growing-belt plan in present conditions is acquired. Then the paper offers some advice on apple growing and Agro-soil & water system studying. Additionally, the study tries to put forward a new method to subdivide the preponderance apple growing belts and accelerate the apple production with a higher quality.
Sorption of polycyclic aromatic hydrocarbons by biochars of wheat straw with different pyrolysis temperaturesDing, Zheng; Zhang, Fan; Sun, Ning; Chi, Jie
doi: 10.1088/1755-1315/237/5/052008pmid: N/A
This study investigated the sorption kinetics of a model solute (phenanthrene and pyrene) with a series of biochars prepared from wheat straw at 100-700 °C (referred as BC100-BC700) to probe the effects of biochars produced at different pyrolysis temperatures on sorption of phenanthrene and pyrene. The samples were characterized by the elemental compositions, Fourier transform IR spectroscopy, and Brunauer-Emmett-Teller-N2 surface areas. The results showed that the sorption parameters (N and lgKf) are linearly related to sorbent aromaticity and the total surface areas, which increase with the pyrolysis temperature. Sorption mechanisms of biochars are evolved from partitioning-dominant at low pyrolysis temperatures to adsorption-dominant at higher pyrolysis temperatures.
Review on the removal of antibiotic resistance genes from livestock manure by compostingXie, Shiyu; Wu, Nan; Tian, Jia; Liu, Xiangmeng; Wu, Shuangshuang; Mo, Qiuxia; Lu, Shuai
doi: 10.1088/1755-1315/237/5/052010pmid: N/A
In recent years, due to the abuse of antibiotics in livestock industry, the antibiotic resistance genes (ARGs) are induced to produce in animals. ARGs are excreted into the environment with the feces, and contaminate the soil and groundwater through horizontal gene transfer (HGT). This in turn causes ARGs contamination. Composting, as an excellent traditional method of recycling manure, has a positive effect on the removal of ARGs from the environment. This article focuses on the removal effects of livestock manure composting (including aerobic composting and anaerobic composting) on ARGs, and then evaluates and prospects the removal of ARGs during manure composting.