Lan W.,Shijiazhuang University |
Lin Z.L.,Shijiazhuang University |
Kai G.M.,Shijiazhuang University
Journal of Advanced Oxidation Technologies | Year: 2017
To improve the efficiency of decomposition of dye wastewater, the experiments of sonocatalytic degradation of Acid Orange 7 by TiO2-based films with doping Co, N and Er3+: Y3Al5O12 were performed in this paper. Based on analysis of the change of concentrations of the samples over time, the result showed that sonocatalytic degradation of Acid Orange 7 by TiO2-based films agreed with the pseudo-first-order kinetics. The effect of doping mass fraction of Er3+:Y3Al5O12, Co and N inTiO2-based films and reaction temperature on degradation rates were studied. The optimal doping mass fraction of Er3+: Y3Al5O12, Co and N were 1.81%, 2.01%, and 12.03% respectively at 20°C. The model of the reaction rate constants of sonocatalytic degradation of Acid Orange 7 by Co/N/Er3+: Y3Al5O12/TiO2 films were fitted. The errors between the model values and the experimental results were all less than 15%. So the models could be used to estimate the degradation rate and concentration of Acid Orange 7 and provide theoretical basis for the design of catalytic reaction. © 2017 by Walter De Gruyter GmbH 2017.
Cui J.,Shijiazhuang University
Chemical Engineering Transactions | Year: 2016
In this paper, the effect of the polynaphthaene sulphonate type water reducer (PSWR) and new type polycarboxylate water reducer (PAWR) on the internal pore structure, internal defects and forces of resistance to external environmental of concrete are fully compared and analyzed. The effect of PAWR on improving the durability of concrete was revealed. The test result showed that compared with PSWR, PAWR can improve the pore structure and pore size distribution of concrete grout, improve the density of concrete, reduce the adiabatic temperature rise of concrete, optimize the hydration heat curve of cement, reduce the shrinkage and deformation of concrete, improve concrete anti-cracking performance and volume stability, to reduce the internal defects of concrete; at the same time, but also to improve the ability of the concrete, including anti-carbonation, frost resistance, chloride ion erosion resistance and steel protection in different degree, as well as to enhance the resistance of concrete to the external environment, thereby greatly improving the durability of concrete. Copyright © 2016, AIDIC Servizi S.r.l.
Li Y.,Shijiazhuang University |
Zhang J.,Chinese Research Institute of Highway |
Chen Y.,Beijing University of Technology |
Wu L.,Shijiazhuang University
Journal of Bridge Engineering | Year: 2017
Rational and precise evaluation for ultimate flexural capacity is essential for accurate prediction of the safety margin and overload capacity of existing bridges. One of the spans of a 28- year-old distressed simply supported T-girder bridge with a span of 20 m was severely damaged, and the decision to replace it with new one was made. A field destructive load test of this distressed span was performed. A nonlinear finite-element model technique was used to predict the failure load and retrace the load-versus-deflection response. The ultimate flexural capacity obtained by the destructive load test was compared with the results of a limit-states design method. The comparison revealed that the ultimate flexural capacity of the distressed bridge was more than the bending moment produced by the combined effect of self-weight and overloaded vehicles plying over it, which explains why the bridge supported overloaded vehicles for many years. © 2017 American Society of Civil Engineers.
Nie G.,Shijiazhuang University |
Liu J.,Shijiazhuang University |
Liu X.,Shijiazhuang University
Waves in Random and Complex Media | Year: 2017
Propagation of transverse surface waves in a three-layer system consisting of a piezoelectric/piezomagnetic (PE/PM) bi-layer bonded on an elastic half-space is theoretically investigated in this paper. Dispersion relations and mode shapes for transverse surface waves are obtained in closed form under electrically open and shorted boundary conditions at the upper surface. Two transverse surface waves related both to Love-type wave and Bleustein–Gulyaev (B–G) type wave propagating in corresponding three-layer structure are discussed through numerically solving the derived dispersion equation. The results show that Love-type wave possesses the property of multiple modes, it can exist all of the values of wavenumber for every selected thickness ratios regardless of the electrical boundary conditions. The presence of PM interlayer makes the phase velocity of Love-type wave decrease. There exist two modes allowing the propagation of B–G type wave under electrically shorted circuit, while only one mode appears in the case of electrically open circuit. The modes of B–G type wave are combinations of partly normal dispersion and partly anomalous dispersion whether the electrically open or shorted. The existence range of mode for electrically open case is greatly related to the thickness ratios, with the thickness of PM interlayer increasing the wavenumber range for existence of B–G type wave quickly shortened. When the thickness ratio is large enough, the wavenumber range of the second mode for electrically shorted circuit is extremely narrow which can be used to remove as an undesired mode. The propagation behaviors and mode shapes of transverse surface waves can be regulated by the modification of the thickness of PM interlayer. The obtained results provide a theoretical prediction and basis for applications of PE–PM composites and acoustic wave devices. © 2017 Informa UK Limited, trading as Taylor & Francis Group
Zhang J.,University of Illinois at Chicago |
Pan X.,Shijiazhuang University |
Li M.,University of Illinois at Chicago |
Yu P.S.,University of Illinois at Chicago
GIS: Proceedings of the ACM International Symposium on Advances in Geographic Information Systems | Year: 2016
Bicycle-sharing systems (BSSs) which provide short-term shared bike usage services for the public are becoming very popular in many large cities. The accelerating bike traveling demands from the public have driven several significant expansions of many BSSs to place additional bikes and stations in their extended service regions. Meanwhile, to capture individuals' traveling needs more precisely, in the expansion, many BSSs have set up online websites to receive station location suggestions from the public. In this paper, we will study the bike station re-deployment problem in the BSSs expansion. Besides the historical bike usage and construction cost information, the crowd suggestions are also incorporated in the problem. The station re-deployment problem is very challenging to solve, and it covers two sub-tasks simultaneously: (1) bike station locations identification, and (2) bike dock assignment (to the deployed stations). To address the problem, a novel bike station re-deployment framework, CROWDPLANNING, is introduced in this paper. In both station deployment and capacity assignment tasks, CROWDPLANNING fuses different categories of spatial information including the crowd suggestions, individuals' historical bike usage and the construction costs simultaneously. By formulating these two tasks as two optimization problems, the optimal expansion strategies can be identified by CROWDPLANNING for the BSSs. Extensive experiments are conducted on the real-world BSSs and crowd suggestion dataset to demonstrate the effectiveness of framework CROWDPLANNING. © 2016 ACM.
Zhang H.,Shijiazhuang University
Computational intelligence and neuroscience | Year: 2017
To deal with the problems of illumination changes or pose variations and serious partial occlusion, patch based multiple instance learning (P-MIL) algorithm is proposed. The algorithm divides an object into many blocks. Then, the online MIL algorithm is applied on each block for obtaining strong classifier. The algorithm takes account of both the average classification score and classification scores of all the blocks for detecting the object. In particular, compared with the whole object based MIL algorithm, the P-MIL algorithm detects the object according to the unoccluded patches when partial occlusion occurs. After detecting the object, the learning rates for updating weak classifiers' parameters are adaptively tuned. The classifier updating strategy avoids overupdating and underupdating the parameters. Finally, the proposed method is compared with other state-of-the-art algorithms on several classical videos. The experiment results illustrate that the proposed method performs well especially in case of illumination changes or pose variations and partial occlusion. Moreover, the algorithm realizes real-time object tracking.
Zhang Z.,Shijiazhuang University |
Qian J.,Chongqing University
Construction and Building Materials | Year: 2017
Compared with the added gypsum, protogenetic anhydrite is the anhydrite in clinker and cement admixture. And using protogenetic anhydrite as the setting retarder instead of added gypsum to make cement could be an effective way to make full use of clinker and wastes with high sulphur content. However, the high temperature sensitivity of solubility property of protogenetic anhydrite may result in unhydrated anhydrite exist in cement paste under high curing temperature at early age, and that may make a bad influence on the properties of cement. This work investigated the effects of protogenetic anhydrite on the long-term strength, volume stability and hydration products of cement paste under different curing temperature. It is shown that higher curing temperature caused the greater value of optimum content of protogenetic anhydrite in cement, and protogenetic anhydrite could not make the bigger volume expansion and worse strength of cement than gypsum when the high curing temperature being used. But curing temperature caused the dissolution of protogenetic anhydrite change and influenced the concentration of sulfate ion in the pore solution of hardened cement paste. The results of XRD patterns showed that the risk of delayed ettringite formation in hardened cement paste cured at high temperature had been increased. The results will be helpful to understand the role of protogenetic anhydrite in cement, and further promote the use of clinker and wastes with high sulfate. © 2017
Wang J.-C.,Shijiazhuang University |
Kang J.-C.,Shijiazhuang University |
Hou W.-H.,Shijiazhuang University
Journal of Railway Engineering Society | Year: 2017
Research purposes: In the program of non-probabilistic reliability analysis of lining structure, stress and intensity interval interference will occur when the non-probabilistic reliability index is 0<η<1. At the same time when analyzing reliability of the lining structural system, failure probability of each unit system usually was calculated by using the traditional methods based on probability theory and fuzzy theory. In this paper, the stress-strength interference model was proposed, the ratio of the area of failure region to the total area of the region constructed by the basic interval variables was taken as the non-probability failure degree of lining structure and the PENT method was combined with the non-probabilistic reliability analysis of the whole tunnel structural system. Research conclusions: (1) The problem of non-probability failure degrees of lining structure under interference situation was successful solved, which showed the non-probability failure degree having compatibility with that from the failure probability. (2)Interval interference lining structure model could be used to calculate non-probability failure of lining structural unit in the tunnel structural system. (3)The results provide a new feasible method for the tunnel structure system reliability analysis, while in the non-probabilistic reliability analysis of actual project interval interference problem also have been solved. © 2017, Editorial Department of Journal of Railway Engineering Society. All right reserved.
Li L.,Shijiazhuang University
Journal of Computational and Theoretical Nanoscience | Year: 2017
The functions of the network analysis system include detection and analysis of network data stream. According to the results of the network analysis, we monitor the network accident and avoid the security risks. This can improve the network performance and increase the network availability. As the data flow in the network is constantly produced, the biggest characteristic of network analysis system is that it is a real-time system. Because of the high requirements of the network data analysis and network fault processing, the system requires very high processing efficiency of the real time data of network. Stream computing is a technique specifically for processing real-time data streams. Its idea is that the value of the data is reduced with the lapse of time, so as long as the data appearing, it must be processed as soon as possible. So we use the technology of stream computing to design network analysis system to meet the needs of real-time capability. Moreover, the stream computing framework has been widely welcomed in the field because of its good expansibility, ease of use and flexibility. In this paper, firstly, we introduce the characteristics of the data processing based on stream computing and the traditional data processing separately. We point out their difference and introduce the technique of stream computing. Then, we introduce the architecture of network analysis system designed base on the technique of stream computing. The architecture includes two main components that are logic processing layer and communication layer. We describe the characteristics of each component and functional characteristics in detail, and we introduce the system load balancing algorithm. Finally, by experiments, we verify the effectiveness of the system's characteristics of dynamic expansion and load balancing. Copyright © 2017 American Scientific Publishers.
Shen Y.-M.,Shijiazhuang University |
Fang X.-Q.,Shijiazhuang University
Meccanica | Year: 2017
Based on the electro-elastic surface/interface theory, the size-dependent effective elastic properties of piezoelectric ceramic embedded with radially polarized nano-fibers are addressed, and the surface/interface effect is considered. Electroelastic equations for radially polarized piezoelectric ceramic are established. The analytical solutions of elastic displacement and electric potentials are exactly derived by separating variables method. The effective elastic modulus in the dilute limit is obtained by satisfying the boundary conditions with consideration of surface/interface energy. Analyses show that the effective elastic properties can be enhanced (or reduced) by adjusting the material properties of surface/interface. © 2017 Springer Science+Business Media Dordrecht