Bu X.,Nanjing Forestry University |
Ruan H.,Nanjing Forestry University |
Wang L.,Fujian Academy of Agricultural science |
Ma W.,Sichuan Academy of Forestry |
And 2 more authors.
Applied Soil Ecology | Year: 2012
Density fractionation can be a useful means of separating soil organic matter (SOM) into light and heavy fractions. Our objective was to evaluate SOM storage in density fractions and the relative contribution of the light fraction to total SOM pool under four different vegetations, including evergreen broad-leaved forest (EBF), coniferous forest (CF), dwarf forest (DF) and alpine meadow (AM), along an altitude gradation in the Wuyi Mountains of southeastern China, and to investigate the factors controlling the pool size in density fractions. Here we separated light and heavy fractions using 1.7gcm-3 sodium iodide solution. The concentrations of C and N in light and heavy fractions were the highest in AM soils, while the C/N ratios in density fractions were the highest in CF soils across soil depths. The amounts of C and N in the heavy fractions increased with increasing silt plus clay content in the corresponding soil depth. Greater SOM storages in light and heavy fractions under AM suggested that the accumulation of SOM at higher altitude (lower soil temperature and higher soil moisture) mainly depends on slower decomposition rate despite lower organic matter inputs rate. The relatively larger contribution of the light fraction to total SOM under CF than that under the other three vegetation types is mainly attributed to its higher amount and quality of litterfall input and greater fine root biomass. Significant correlation existed between light fraction C and N, dissolved organic C, microbial biomass C and N, indicating considerable cycling of C and N between these pools. A stronger correlation between heavy fraction C and microbial biomass C suggested that the heavy fraction organic matter could be associated with most microbial biomass. © 2011 Elsevier B.V.
Liu R.,Huaihai Institute of Technology |
Lu Y.,Lianyungang Technical College |
Gong C.,Huaihai Institute of Technology |
Liu Y.,Huaihai Institute of Technology
Infrared Physics and Technology | Year: 2012
Detecting point targets in infrared images is a difficult task. Template matching is simple and easy to implement for completing this task. However, it has some shortcomings. We propose an improved template matching method for detecting targets. Different from the classic template matching, the projection coefficients obtained from principal component analysis are used as templates and the nonlinear correlation is proposed to measure the similarity, the matching degree. The correlation in original space can not capture the higher-order statistical property of images. So its detection performance is not satisfying. We introduce the nonlinear correlation, which computes the correlation coefficients in a higher-dimensional feature space or even in an infinite-dimensional feature space, to capture the higher-order statistics. The detection performance is improved greatly. Results of experiments show that the improved method is competent to detect infrared point targets. © 2012 Elsevier B.V. All rights reserved.
Lu Y.,Lianyungang Technical college |
Feng Y.,Huaihai Institute of Technology
Journal of Convergence Information Technology | Year: 2012
Target tracking is an important application in wireless sensor networks, in which all sensor nodes collaborate to discover the target and report its location information to users. To conserve energy in networks and improve tracking performance, the author propose an energy efficient target tracking algorithm based on sleeping scheduling (EETT-S) for wireless sensor network, EETT-S has three obvious features: Firstly, it improves virtual grid ideas to divide each cluster into M×N square area and select a working node in each grid to reduce redundant information and economize energy. Secondly, it improves energy utility by changing the activity of wireless communication module of sensor nodes, energy model and state transition of sensor nodes. Last, it adopts different sleep scheduling mechanism to mention improve the utilization of energy in the process of tracking. Simulation results show that, compared with AODV and TSR, EETT-S significantly reduce in energy consumption and prolong the network lifetime.
Huang P.,Huaihai Institute of Technology |
Yu J.,Lianyungang Technical College
Proceedings - 2013 International Conference on Computational and Information Sciences, ICCIS 2013 | Year: 2013
It has always been the hot topic as how it works between the financial development and the economic growth. How about it in Lianyungang city, the leading developing coastal city? By applying VAR Model and Granger Causality Test, the article studies the relationship between regional financial development and economic growth in Lianyungang city in the period from 2000 to 2011. The empirical results provide support for the hypothesis that there is a long-term cointegration relationship between the regional financial development and economic growth, but this relationship is not so significant, and there is no Granger causality between the both. So a further development should be made in financial industry and allocative efficiency should be better to lead to a sound interaction between them. © 2013 IEEE.
Liu R.,Huaihai Institute of Technology |
Lu Y.,Lianyungang Technical College
Infrared Physics and Technology | Year: 2012
Tracking targets in infrared images is a challenging subject due to the low contrast and severe noise. Kernel density estimation (KDE) with robust performance is one of the well-known tracking algorithms. In essence, tracking targets with KDE algorithm is tracking the statistical features of their pixels by the histograms. The universal KDE which can track any features of targets has not been developed. We propose a strategy which does not need to improve on the KDE algorithm itself, but it can make KDE track other features. We first map the features into the pixel intensity and create the feature images. Then these feature images are used to construct the multiple feature pseudo-color images (MFPCIs). The kernel density estimation algorithm tracks targets in MFPCIs can indirectly track these features. Experiments validate that the performance of tracking targets in MFPCIs outperforms that of tracking them in the original infrared images.
Xu J.M.,Lianyungang Technical College
Applied Mechanics and Materials | Year: 2014
With the rapid development of network technology, applications based on web especially in higher education are paid attention by the people day by day. Network education as the construction of open education system, more and more get the attention of education workers. This paper discusses the university student thought political education network platform to build, opened up a new carrier of the teachers and students to exchange and communication with the new channel. The platform to break the traditional mode of ideological and political education in time and space constraints, improve the teaching efficiency and quality, to achieve real quality education and the flexible personalized education, cultivate qualified builders and successors for socialism has very important significance. © (2014) Trans Tech Publications, Switzerland.
Wang H.-J.,Lianyungang Technical College
Advances in Information Sciences and Service Sciences | Year: 2012
This research studies a cooperative data transmission technology based on decentralized two-hop and two relay, which could be applied in wireless communication network. In this research, a decentralized optimization relay selection scheme was built on the basis of both symbol error rate SER) and signal-to-noise ratio(S/N) of wireless channel. Meanwhile, a cooperative data transmission technology was formed according to the selection scheme. Both the decentralized optimization relay selection scheme and the cooperative data transmission technology were aimed to dissolve problems such as dynamic topology and dynamic channel in the wireless network which were beyond the currently applied cooperation diversity. This technology is first to apply two-hop and two relay to form formulas of both symbol error rate SER) and signal-to-noise ratio(S/N) between which the currently optimizing cooperative node is chosen. And it will orient itself between the amplify-and-forward and decode-and-forward according to the quality of the wireless channel. The analysis suggests that such technology is able to significantly enhance the utilization ratio of resources of the wireless network and perform well in the outage probability and the symbol error rate SER).
Liu S.,Lianyungang Technical College |
Xie M.,Nanjing University |
Guo X.,Nanjing University |
Ji W.,Nanjing University
Materials Letters | Year: 2013
Mono-dispersed CeO2 hollow nanospheres with the size in the 50-200 nm range were fabricated at room temperature by a facile etching approach based on the redox reaction between CeO2 solid nanospheres of certain size (as self-template) and FeSO4 (as etching agent). The internal diameter of the CeO2 hollow nanostructure gradually increases with extending reaction time. The obtained CeO2 materials are morphologically uniform, with well-defined hollow structure and large surface area of 61 m2/g (the solid counterpart is 18 m 2/g). A redox mechanism was proposed to explain the evolution of CeO2 hollow nanospheres from the solid precursors. The present methodology is thought to be versatile for preparing hollow nanostructures of other oxides. © 2013 Elsevier B.V.
Li H.,Lianyungang Technical College |
Qi Z.,Lianyungang Technical College
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015
Effects of quenching temperature and tempering temperature on 42CrMo cold working die steel were investigated by tensile testing, impacting testing, hardness measurement and microstructure observation. The results show that, with tempering at 200 ℃, with the increase of quenching temperature, the tensile strength is increased firstly and then decreased, while, elongation, section shrinkage and impact power are decreased. With tempering at 600 ℃, with the increase of quenching temperature, the tensile strength of die steel is reduced lightly ahead of 1040 ℃, while the elongation, section shrinkage, impact and hardness are decreased. After 200 ℃ tempering, the strength of the steel mold meet the requirements, however, the elongation and impact power energy are lower than the standard requirements. After tempering at 600 ℃, the strength, plasticity and toughness meet the requirements of cold work die steel substrate. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.
Yong S.,Lianyungang Technical College |
Jin-Jun Z.,Lianyungang Technical College |
Xiao-Li L.,Lianyungang Technical College
Electronic Journal of Geotechnical Engineering | Year: 2016
In order to analyze the applicability of the pile-anchor retaining structure in soft soil foundation, combined with some examples of foundation pit engineering in Lianyungang area, the deformation characteristics of pile-anchor was analyzed and think anchorage angle has a greater impact on supporting effect, so the numerical model was established to calculate the influence of different anchorage angle to pit's deformation, the results show: there is a different from rock slope anchorage, foundation pit of soft ground has not the optimal anchorage angle, but anchorage angle is bigger, the better. In addition, the foundation pit in soft soil, the pile-anchor structure is prone to rotate, which exacerbated the deformation of the soil. This kind of phenomenon will be intensified, when the anchorage Angle is larger, when the anchorage angle reaches a certain value, the pile bottom even has a reverse displacement. © 2016 ejge.