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Ganesh Jethave,Umesh Fegade,Sanjay Attarde,Sopan Ingle 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
New LD-ZAO-NPs was facilely synthesized and characterized by FESEM, XRD, EDX and FT-IR. Under the optimal conditions, the MO removal efficiency reached 99.60% after 30 min, Langmuir isotherm and a pseudo second-order kinetic model showed high performance. The thermodynamic parameters showed that the adsorption was spontaneous and favorable as DG0 is negative and exothermic in nature as DH0 is negative (0.025 kJ/mol). The maximum adsorption capacity (qmax) in single component system 200 mg g1 for MO supports high efficiency of LD-ZAO-NPs as new adsorbent. Altogether, the superior performance of LD-ZAO-NPs was manifested by fast kinetics and high adsorption capacity.
Simulation of fracture in plain concrete modeled as a composite material
Thanh T. Bui,Mario M. Attard 한국계산역학회 2005 Computers and Concrete, An International Journal Vol.2 No.6
A composite model is used to represent the heterogeneity of plain concrete consisting of coarse aggregates, mortar matrix and the mortar-aggregate interface. The composite elements of plain concrete are modeled using triangular finite element units which have six interface nodes along the sides. Fracture is captured through a constitutive single branch softening-fracture law at the interface nodes, which bounds the elastic domain inside each triangular unit. The inelastic displacement at an interface node represents the crack opening or sliding displacement and is conjugate to the internodal force. The path-dependent softening behaviour is developed within a quasi-prescribed displacement control formulation. The crack profile is restricted to the interface boundaries of the defined mesh. No re-meshing is carried out. Solutions to the rate formulation are obtained using a mathematical programming procedure in the form of a linear complementary problem. An event by event solution strategy is adopted to eliminate solutions with simultaneous formation of softening zones in symmetric problems. The composite plain concrete model is compared to experimental results for the tensile crack growth in a Brazilian test and three-point bending tests on different sized specimens. The model is also used to simulate wedge-type shear-compression failure directly under the loading platen of a Brazilian test.
Improved Methods for Determining the 3 Dimensional Initial Shapes of Cable-Supported Bridges
김문영,김동영,정명락,Mario M. Attard 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.1
The TCUD method (Kim and Lee, 2001) can minimize undesirable lateral displacements in cable bridge structures byincluding the unstrained lengths of the cable members as unknowns and introducing additional constraint conditions. The axialdeformations in the girder and the main tower deviating from the target configuration are, however, unavoidable when selfanchoredcable bridges are considered. On the other hand, the IFM (initial force method) can be used to adjust the axialdeformations to conform to the initial shape but it is critical that the unstrained lengths of the cables are accurately evaluated. In this study, improved schemes for the TCUD method and the IFM for finding the initial shape of 3 dimensional cablesupportedbridges under dead load, are presented. For this purpose, the TCUD method and the initial force method are firstlyreviewed. Two improved algorithms, which can overcome shortcomings of the previous initial-shaping analysis methods, aredeveloped based on an elastic catenary cable element and a nonlinear space frame element. Finally, the accuracy andeffectiveness of the proposed analysis algorithms are demonstrated through the numerical application to 3 dimensional initialshape problems for self-anchored suspension and cable-stayed bridges.