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Cheng L.-H.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Cheng L.-H.,East China Institute of Technology | Liu G.-L.,No 2 Hydropower Force of Armed Police | Li A.-F.,East China Institute of Technology
Civil Engineering and Urban Planning IV - Proceedings of the 4th International Conference on Civil Engineering and Urban Planning, CEUP 2015 | Year: 2016

This Paper improved the nonlinear elastic Duncan-Chang model by using the rock and soil elastic plastic theory. This paper introduces finite element program to simulate pit excavation lateral unloading process, according to Duncan-Chang model and Goodman surface unit. The theoretical calculation results fairly approach measured values, which verifies the rationality of the improved Duncan-Chang model. © 2016 Taylor & Francis Group, London.


Xiao S.J.,East China University of Technology | Huang H.Q.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Zhang L.,Nanchang University
Analytica Chimica Acta | Year: 2016

Molybdenum oxide (MoOx) is a well-studied transition-metal semiconductor material, and has a wider band gap than MoS2 which makes it become a promising versatile probe in a variety of fields, such as gas sensor, catalysis, energy storage ect. However, few MoOx nanomaterials possessing photoluminescence have been reported until now, not to mention the application as photoluminescent probes. Herein, a one-pot method is developed for facile synthesis of highly photoluminescent MoOx quantum dots (MoOx QDs) in which commercial molybdenum disulfide powder and hydrogen peroxide (H2O2) are involved as the precursor and oxidant, respectively. Compared with current synthesis methods, the proposed one has the advantages of rapid, one-pot, easily prepared, environment friendly as well as strong photoluminescence. The obtained MoOx QDs is further utilized as an efficient photoluminescent probe, and a new off-on sensor has been constructed for phosphate (Pi) determination in complicated lake water samples, attributed to the fact that the binding affinity of Eu3+ ions to the oxygen atoms from Pi is much higher than that from the surface of MoOx QDs. Under the optimal conditions, a good linear relationship was found between the enhanced photoluminescence intensity and Pi concentration in the range of 0.1-160.0 μM with the detection limit of 56 nM (3σ/k). The first application of the photoluminescent MoOx nanomaterials for ion photochemical sensing will open the gate of employing MoOx nanomaterials as versatile probes in a variety of fields, such as chemi-/bio-sensor, cell imaging, biomedical and so on. © 2015 Elsevier B.V.


Zhang Z.-B.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Zhang Z.-B.,East China Institute of Technology | Zhang Z.-B.,Wuhan University | Liu Y.-H.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | And 6 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2013

The ability of oxygen-rich carbon spheres (CSs) produced by hydrothermal carbonization with the glucose has been explored for the removal and recovery of uranium from aqueous solutions. The micro-morphology and structure of CSs were characterized by FT-IR and SEM. The influences of different experimental parameters such as solution pH, initial concentration, contact time, ionic strength and temperature on adsorption were investigated. The CSs showed the highest uranium sorption capacity at initial pH of 6.0 and contact time of 25 min. Adsorption kinetics was better described by the pseudo-second-order model and adsorption process could be well defined by the Langmuir isotherm. The thermodynamic parameters, ΔG (298 K), ΔH and ΔS were determined to be -16.88, 12.09 kJ mol-1 and 197.87 J mol-1 K-1, respectively, which demonstrated the sorption process of CSs towards U(VI) was feasible, spontaneous and endothermic in nature. The adsorbed CSs could be effectively regenerated by 0.05 mol/L HCl solution for the removal and recovery of U(VI). Complete removal (99.9 %) of U(VI) from 1.0 L industry wastewater containing 15.0 mg U(VI) ions was possible with 3.0 g CSs. © 2012 Akadémiai Kiadó, Budapest, Hungary.


Liu Y.-H.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Liu Y.-H.,East China Institute of Technology | Wang Y.-Q.,East China Institute of Technology | Zhang Z.-B.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | And 6 more authors.
Applied Surface Science | Year: 2013

In this study, a low-cost and high-efficient carbonaceous adsorbent (HTC-COOH) with carboxylic groups was developed for U(VI) removal from aqueous solution compared with the pristine hydrothermal carbon (HTC). The structure and chemical properties of resultant adsorbents were characterized by Scanning electron microscope (SEM), N2 adsorption-desorption, Fourier transform-infrared spectra (FT-IR) and acid-base titration. The key factors (solution pH, contact time, initial U(VI) concentrations and temperature) affected the adsorption of U(VI) on adsorbents were investigated using batch experiments. The adsorption of U(VI) on HTC and HTC-COOH was pH-dependent, and increased with temperature and initial ion concentration. The adsorption equilibrium of U(VI) on adsorbents was well defined by the Langmuir isothermal equation, and the monolayer adsorption capacity of HTC-COOH was found to be 205.8 mg/g. The kinetics of adsorption was very in accordance with the pseudo-second-order rate model. The adsorption processes of U(VI) on HTC and HTC-COOH were endothermic and spontaneous in nature according to the thermodynamics of adsorption. Furthermore, HTC-COOH could selectively adsorption of U(VI) in aqueous solution containing co-existing ions (Mg2+, Co2+, Ni2+, Zn2+ and Mn2+). From the results of the experiments, it is found that the HTC-COOH is a potential adsorbent for effective removal of U(VI) from polluted water. © 2013 Elsevier B.V. All rights reserved.


Liang J.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Liang J.,East China Institute of Technology | Yu D.,Guangxi University of Science and Technology | Yang Z.,East China Institute of Technology | Chai X.,East China Institute of Technology
Computers and Concrete | Year: 2016

This paper reports the testing of concrete slabs reinforced with CFRP prestressed concrete prisms(PCP) on the flexural behavior. Four concrete slabs were tested, a reference slab reinforced with steel bars, and three slabs reinforced with CFRP prestressed concrete prisms (PCP). All slabs were made with dimensions of 600mm in width, 2200mm in length and 150 in depth. All concrete slabs reinforced with CFRP prestressed concrete prisms(PCP) exhibited CFRP bar rupture failure mode. It was shown that the application of the CFRP prestressed prisms can limit service load deflections and crack width, the increased level of prestress in the CFRP prestressed prism positively affected the maximum crack width. The deflection of concrete slabs reinforced with CFRP prestressed prisms decreased as prestress in the CFRP prestressed prism increased. Copyright © 2016 Techno-Press, Ltd.


Liang J.F.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Liang J.F.,East China Institute of Technology | Yu D.,Guangxi University of Science and Technology | Yu B.,Monash University
Computers and Concrete | Year: 2016

An experimental investigation on the behaviour of concrete beams reinforced with various reinforcement, including ordinary steel bars, CFRP bars and CFRP prestressed concrete prisms(PCP). The main variable in the test program was the level of prestress and the cross section of PCP.The modes of failure and the crack width were observed. The results of load-deflection and load-crack width characteristics were discussed. The results showed that the CFRP prestressed concrete prisms as flexural reinforcement of concrete beams could limit deflection and crack width under service load and PCP can overcome the serviceability problems associated with the low elastic modulus/strength ratio of CFRP. Copyright © 2016 Techno-Press, Ltd.


Liang J.F.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Liang J.F.,East China Institute of Technology | Wang J.B.,East China Institute of Technology | Li J.P.,East China Institute of Technology
Applied Mechanics and Materials | Year: 2013

The flexural behavior of concrete beams reinforced with CFRP-PCPs composite rebars was studied. Experimental results showed that the deflection of beams reinforced with highly prestressed prisms is at service loads coMParable to deflection of steel reinforced beam. Flexural cracks of CFRP-PCPs composite rebars reinforced beams are hairline before prism cracking, and widened after the prism cracking. When the concrete beam was reinforced with the prestressed concrete prisms, the crack width decreased as the prestress in the prism increased. © (2013) Trans Tech Publications, Switzerland.


Liang J.-F.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Liang J.-F.,East China Institute of Technology | Hu M.-H.,East China Institute of Technology | Deng Z.-P.,East China Institute of Technology
Applied Mechanics and Materials | Year: 2013

The flexural behavior of concrete beams reinforced with CFRP-PCPs composite rebars was studied. Experimental results showed that the performance of CFRP-PCPs composite rebars beams is superior to that of CFRP beams at service and ultimate and comparable and even better than RC beams at service condition. Flexural cracks of concrete beams reinforced with CFRP-PCPs composite rebars are hairline before prism cracking, and they widen after the prism Cracking. © (2013) Trans Tech Publications, Switzerland.


Liang J.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Liang J.,East China Institute of Technology | Yu D.,Guangxi University of Science and Technology | Wang J.,East China Institute of Technology | Yi P.,East China Institute of Technology
Earthquake and Structures | Year: 2016

This paper presents the results of cyclic loading tests on concrete beams reinforced with various reinforcement, including ordinary steel bars, CFRP bars and CFRP prestressed concrete prisms(PCP). The main variable in the test program was the level of prestress and the cross section of PCP. The seismic performance indexes including hysteretic loops, skeleton curve, ductility, energy dissipation capacity and stiffness degradation were analyzed. The results show that the CFRP prestressed concrete prisms as flexural reinforcement of concrete beams has good seismic performance. And the ductility and the energy dissipation capacity were good, the hysteresis loops were full and had large area. © 2016 Techno-Press, Ltd.


Liang J.-F.,State Key Laboratory Breeding Base of Nuclear Resources and Environment | Liang J.-F.,East China Institute of Technology | Yang Z.-P.,East China Institute of Technology | Yi P.-H.,East China Institute of Technology | Wang J.-B.,East China Institute of Technology
Applied Mechanics and Materials | Year: 2014

This paper presents the development of a detailed 3D nonlinear finite element (FE) numerical model that can accurately predict the load-carrying capacity and response of RC beams strengthened with NSM CFRP-PCPs composite bars subjected to four-point bending loading. The predicted FE mid-span deflection responses agreed very well with the corresponding measured experimental tested data at all stages of flexural loading. © (2014) Trans Tech Publications, Switzerland.

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