Search results for: C.G. Jung

Items from 1 to 9 out of 9 results

article

A thermogravimetric model to predict yield product distribution in pyrolysis of agricultural biomass

O. Ioannidou, C.G. Jung, A. Zabaniotou

Catalysis Today > 2011 > 167 > 1 > 129-134

The present study contributes to the opportunities in producing gaseous or liquid substitution fuels by biomass pyrolysis or gasification. By both processes, the issued fuel characteristics are quite different so that the application fields have to be optimized. Using a predictive model, pyrolysis mass balance could be evaluated so that the fuel qualities could be predicted. In the present study,...

article

Bendable metallic sandwich plates with a sheared dimple core

D.Y. Seong, C.G. Jung, D.Y. Yang, J.H. Kim, more

Scripta Materialia > 2010 > 63 > 1 > 81-84

Most structured sandwich plates cannot be simply deformed by conventional forming operations. Bendable sandwich plates with a sheared dimple core were introduced to expand the application fields. The core shear strength increased as the gap between the attachment points decreased. This characteristic produces benefits, such as preventing face buckling and core shear failure. U-bending experiments...

article

Analysis of core shear stress in welded deformable sandwich plates to prevent de-bonding failure during U-bending

D.Y. Seong, C.G. Jung, D.Y. Yang, J. Ahn, more

Journal of Materials Processing Tech. > 2010 > 210 > 9 > 1171-1179

In this work, a multi-point resistance welding process was employed as a bonding mechanism for deformable sandwich plates with sheared dimple cores to improve productivity. During U-bending, a de-bonding failure occurred due to the shear deformation of the core. An analytic study that investigated the bending mechanism was carried out to determine the control parameter of core shear stress. The analytic...

article

Quasi-isotropic bending responses of metallic sandwich plates with bi-directionally corrugated cores

D.Y. Seong, C.G. Jung, D.Y. Yang, K.J. Moon, more

Materials and Design > 2010 > 31 > 6 > 2804-2812

In order to reduce anisotropic behaviors of sandwich plates with open channel cores under the bending load, bi-directionally corrugated cores were introduced. Bi-directionally corrugated core has two additional design parameters related with a corrugation pass than uni-directionally corrugated core, so that its properties with respect to core orientations can be controlled. Sandwich plate with bi-directionally...

article

Mechanical properties and failure characteristics of ISB panel with metalllic pyramidal inner structures

D.G. Ahn, S.H. Lee, C.G. Jung, G.Y. Hahn, more

Journal of Materials Processing Tech. > 2007 > 187-188 > Complete > 521-525

The objective of this paper is to investigate the influence of design parameters of the ISB panel, an inner structured and bonded panel with metallic pyramidal inner structures, on mechanical properties and failure characteristics to obtain the optimum design of the ISB panel. Several experiments and analyses for the case of tensile and three-points bending load have been carried out to examine the...

article

Active carbon production from used tire in two-stage procedure: industrial pyrolysis and bench scale activation with H2O–CO2 mixture

A. Zabaniotou, P. Madau, P.D. Oudenne, C.G. Jung, more

Journal of Analytical and Applied Pyrolysis > 2004 > 72 > 2 > 289-297

In the present study active carbons have been prepared from used tires and their characteristics were investigated. A two-stage activation procedure (pyrolysis at 800°C in N ₂ atmosphere during 45min in an industrial pyrolyser with a capacity of 1t/h, followed by CBp activation with steam in the presence of CO ₂ at 970°C in a bench scale reactor) was used for the production of activated...

article

Scrap tyres pyrolysis: technology and equipment update, by-products valorisation

C.G. Jung, A. Fontana

Elastomery > 2001 > T. 5, nr 2 > 38-40

Scrap tyres, classified as priority waste stream by EU Commission, present disposal problems. According to recently prepared the EU Landfill Directive dumping will not more be allowed. There is a need for optimisation of the choice between material and energy valorisation in relation to the existing secondary raw material market. The quantity and quality of the end-products depends mainly on the process...

article

Influence of ultrasound on the kinetic parameters of electrochemical redox reactions

C.G. Jung, F. Chapelle, A. Fontana

Ultrasonics - Sonochemistry > 1997 > 4 > 2 > 117-120

The aim of this work is to determine the Tafel parameters with and without ultrasound. The total overvoltage has been corrected for diffusion by using rotating disk technique and potentiostatic extrapolation to infinite rotating speed. Three well known redox systems have been selected regardless to their different electrochemical behaviour: the quinone-hydroquinone, the Fe(II)-Fe(III) chlorides...

article

Ultrasonic removal of heavy metals from waste oils

A. Fontana, C. Braekman-Danheux, C.G. Jung

Fuel Processing Technology > 1996 > 48 > 2 > 107-113

The elimination of lead from used motor oils is performed by ultrasonic lixiviation using nitric acid, the lead being recuperated as lead sulfate during the acid regeneration. Beside the treatment of waste oils by the traditional methods, this new processing way gives alternative routes, not used usually for waste oils, such as introduction through the blowpipes of a blast furnace, addition to the...

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