Liu J.,East China Jiaotong University
Discrete and Computational Geometry | Year: 2017
We establish two new weighted Erdős–Mordell type inequalities with the help of software Maple. Two related interesting conjectures checked by computer are also proposed. © 2017 Springer Science+Business Media, LLC
Chen A.,East China Jiaotong University |
Chen A.,Swinburne University of Technology
Optics Express | Year: 2011
In a triple semiconductor quantum well structure coupled by two external fields, we investigate the influence of atomic coherence induced by external fields and decay interference on the absorption and dispersion of a weak pulsed light, and slow light can be achieved in this system. Quantum well structure behaves as "artificial atom" and its advantage of easy integration makes it has some practical applications. © 2011 Optical Society of America.
Liu H.,Peking University |
Xie G.,Peking University |
Xie G.,East China Jiaotong University |
Wang L.,Peking University
Automatica | Year: 2012
In this paper, containment control problems for networked multi-agent systems with multiple stationary or dynamic leaders are investigated. The topologies that characterize the interaction among the leaders and the followers are directed graphs. Necessary and sufficient criteria which guarantee the achievement of containment control are established for both continuous-time and sampled-data based protocols. When the leaders are stationary, the convergence for continuous-time protocol (sampled-data based protocol) is completely dependent on the topology structure (both the topology structure and the size of sampling period). When the leaders are dynamic, the convergence for continuous-time protocol (sampled-data based protocol) is completely dependent on the topology structure and the gain parameters (the topology structure, the gain parameters, and the size of sampling period). Moreover, the final states of all the followers are exclusively determined by the initial values of the leaders and the topology structure. In the stationary leaders case, all the followers will move into the convex hull spanned by the leaders, while in the dynamic leaders case, the followers will not only move into the convex hull but also move with the leaders with the same velocity. Finally, all the theoretical results are illustrated by numerical simulations. © 2012 Elsevier Ltd. All rights reserved.
Gong X.-B.,East China Jiaotong University
International Biodeterioration and Biodegradation | Year: 2012
In this work, remediation of weathered crude oil-contaminated soil by biostimulation of indigenous microbes through addition of peanut hull as bulking agent was conducted in laboratory. A modified Fenton oxidation, using Fe(III) chelated with nitrilotriacetic acid in a molar ratio of 1:1 as a catalyst, was applied to the bioremediation. The results showed that, after bioremediation for 20 weeks, reduction of total petroleum hydrocarbons (TPHs) by 88.9% was observed in the combined treatment compared with 55.1% in the biological treatment alone. The Microtox ® toxicity of treated soil extract was reduced greatly after the chemical oxidation process. Biostimulation with inorganic nitrogen and phosphorus increased TPH degraders in the treated soil by two orders of magnitude. The activity of microbial communities also increased markedly in the treated soil compared with that in the control. © 2012 Elsevier Ltd.
Chen A.,East China Jiaotong University |
Chen A.,University of WaterlooOntario
Optics Express | Year: 2014
In triple coupled semiconductor quantum well structures (SQWs) interacting with a coherent driving filed, a coherent coupling field and a weak probe field, spontaneous emission spectra are investigated. Our studies show emission spectra can easily be manipulated through changing the intensity of the driving and coupling field, detuning of the driving field. Some interesting physical phenomena such as spectral-line enhancement/suppression, spectral-line narrowing and spontaneous emission quenching may be obtained in our system. The theoretical studies of spontaneous emission spectra in SQWS have potential application in high-precision spectroscopy. Our studies are based on the real physical system [Appl. Phys. Lett. 86(20), 201112 ( 2005)], and this scheme might be realizable with presently available techniques. ©2014 Optical Society of America
Wan D.-Q.,East China Jiaotong University
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012
The phase morphology evolution during the solid solution treatment and then artificial aging of the La-modified ZL107 Al alloy was studied. The results show that when the solid solution was held at 560°C for 6 h, only partial Si phase dissolved into the matrix; however, the precipitation also occurred during the artificial aging process. The precipitation process in Al-Si alloys with or without La-modification was compared. After modification and heat treatment, the mechanical properties of the alloy were greatly enhanced, due to the modification and uniform distribution of Si phase. © 2012 The Nonferrous Metals Society of China.
Wu S.,East China Jiaotong University
Advances in Information Sciences and Service Sciences | Year: 2012
This article analyzes the characteristics of modern production system. It points out that structure of modern production system is composed of heterogeneous groups and production information that is dynamically changing. As a result, there is a bottleneck in most existing monitoring systems that it is hardly easy to acquire and exchange terminal data. In order to solve this problem, this article has proposed a Multi-Agent based system that is designed for monitoring production management. This article shows that, with the Radio Frequency Identification (RFID) technology whose function is to track and identify the production process and to get real-time data, the Multi-Agent based monitoring system can help the enterprises to make decision and to obtain real-time information of the production.
Zhang Q.,East China Jiaotong University
Environmental technology | Year: 2015
In this study, the Fe/Cu/C and Fe/Al/C inner micro-electrolysis systems were used to treat actual oilfield produced water to evaluate the feasibility of the technology. Effects of reaction time, pH value, the dosage of metals and activated carbon, and Fe:C mass ratio on the treatment efficiency of wastewater were studied. The results showed that the optimum conditions were reaction time 120 min, initial solution pH 4.0, Fe dosage 13.3 g/L, activated carbon dosage 6.7 g/L, Cu dosage 2.0 g/L or Al dosage 1.0 g/L. Under the optimum conditions, the removal efficiencies of chemical oxygen demand (COD) were 39.3%, 49.7% and 52.6% in the Fe/C, Fe/Cu/C and Fe/Al/C processes, respectively. Meanwhile, the ratio of five-day biochemical oxygen demand to COD was raised from 0.18 to above 0.35, which created favourable conditions for the subsequent biological treatment. All these led to an easy maintenance and low operational cost.
Li P.,East China Jiaotong University
Mathematical and Computer Modelling | Year: 2011
In this paper, the structural damage localization on a simple composite plate specimen is identified using probabilistic neural networks. First, the category to be identified is defined according to the structural location, and the number of categories is reduced by grouping neighboring elements to one category. Second, the state data of damaged structure are collected by a data collection system, and are utilized as feature vectors for the probabilistic neural network. Finally, the smoothing parameter in the probabilistic neural network is studied. When this trained network is subjected to the measured response, it should be able to locate existing damage. The effectiveness of the proposed method is demonstrated. © 2010 Elsevier Ltd.
Tu C.,East China Jiaotong University
International Journal of Digital Content Technology and its Applications | Year: 2012
Wireless sensor network (WSN) is a key enabling technology for ambient intelligence, where localization of sensor nodes is a fundamental and essential issue. Aiming at localization deficiency of DV-Based algorithm which are caused by the shortest path distance substituting for Euclidean distance, combing the advantages of error inhibition of MSO (mass-spring model), in this paper we propo se a DV-MSO localization algorithm, which not restrains the localization error of DV-Hop algorithm, but also overcomes the defect of MSO algorithm that it is easy to fall into local optimum. Simulation results demonstrate that the localization error of unknown nodes is reduced greatly by the proposed method.