K. Hashiguchi¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.4, No.4, pp. 257-264, 2007, DOI:10.3970/icces.2007.004.257

Abstract General corotational rate of tensors in arbitrary order having the objectivity is shown first, and then it is verified that the material-derivative of yield condition can be replaced generally to the corotational derivative, i.e. the consistency condition. More >

Shunde Yin¹, Leo Rothenburg¹, Maurice B. Dusseault¹

CMES-Computer Modeling in Engineering & Sciences, Vol.19, No.2, pp. 111-120, 2007, DOI:10.3970/cmes.2007.019.111

Abstract Subsidence problem is of great importance in petroleum engineering and environmental engineering. In this paper, we firstly apply a hybrid Displacement Discontinuity-FEM modeling to this classic problem: the evaluation of subsidence over a compacting oil reservoir. We use displacement discontinuity method to account for the reservoir surrounding area, and finite element methods in the fully coupled simulation of the reservoir itself. This approach greatly reduces the number of degrees of freedom compared to an analyzing fully coupled problem using only a finite element or finite difference discretization. More >

K. Hashiguchi¹

CMES-Computer Modeling in Engineering & Sciences, Vol.17, No.1, pp. 55-62, 2007, DOI:10.3970/cmes.2007.017.055

Abstract Constitutive equation describing the mechanical properties of material has to be formulated in an identical form independent of coordinate systems by which it is described even if there exist any mutual configuration and/or mutual rotation between the material and coordinate systems. This mechanical requirement is attained by describing rate variables as corotational rate tensors with objectivity in constitutive equations in rate form. Besides, in order to use the material-time derivative of yield condition as a consistency condition it has to be replaced to the corotational derivative. In this note a general corotational rate for tensors More >

Ilona Bányász¹, Géza Bokodi¹, Barna Vásárhelyi², András Treszl¹, László Derzbach¹, András Szabó¹, Tivadar Tulassay^1,2,3, Ádám Vannay³

European Cytokine Network, Vol.17, No.4, pp. 271-275, 2006, DOI:10.1684/ecn.2006.0043

Abstract Background. Fabry disease is an X-linked disorder associated with early-onset stroke, cardiomyopathy, and progression to end-stage renal failure. Correlations between inflammatory cytokines have been shown in other lysosomal storage diseases. The aim of the study was to evaluate functional gene polymorphisms of key pro- and anti-inflammatory cytokines and to correlate them to a clinical score to assess the potential role of inflammation in Fabry disease. Design. Genotyping for IL-10[819C/T; -592C/A]; IL-1β[+3954C/T; –511C/T]; IL-1α[-889C/T]; and TNF-α[-308G/A] was performed in 76 patients and correlated with MSSI sub-scores and with enzyme (alpha-galactosidase A) levels. Fifty, normal, age- and… More >

Jason P. Izard¹, Richard D. Sowery¹, Melanie T. Jaeger², D. Robert Siemens¹

Canadian Journal of Urology, Vol.13, No.3, pp. 3158-3163, 2006

Abstract Introduction and objectives: Peri-operative bladder management after major arthroplasty procedures remains controversial. The purpose of this study was to assess the risk of urological complications in those patients undergoing hip or knee joint replacement. As well, we identified those factors that may affect the likelihood of developing complications.
Methods: Two hundred and twenty-one consecutive patients receiving a total knee or hip arthroplasty were reviewed. The outcomes measured were prolonged urinary retention, as well as urinary tract infections and the development of a septic prosthesis. Statistical significance of any predisposing factors identified was determined using a two-tailed Fisher… More >

M. C. Smaldone, G. M. Cannon Jr, R. M. Benoit

Canadian Journal of Urology, Vol.13, No.6, pp. 3351-3352, 2006

Abstract Currently, the prosthesis of choice for patients undergoing penile prosthesis surgery is a three piece inflatable device, as this provides optimal inflation and deflation when compared to a one or two piece prosthesis. However, prior pelvic surgery or radiation therapy can obliterate the retropubic space and make placement of the reservoir required for a three piece prosthesis difficult. We report a novel location for reservoir placement in a man who had undergone multiple pelvic surgeries after suffering a severe pelvic crush injury. More >

R. Costa¹, J. Alfaiate²

Structural Durability & Health Monitoring, Vol.2, No.1, pp. 11-18, 2006, DOI:10.3970/sdhm.2006.002.011

Abstract In this paper a numerical simulation is performed on the behaviour of reinforced concrete beams, submitted to initial damage, subsequently strengthened with external steel plates bonded with epoxy. Modelling these structures requires the characterization of the behaviour of different materials as well as the connection between them. Fracture is modelled within the scope of a discrete crack approach, using a formulation in which strong discontinuities are embedded in the finite elements. In this approach, the displacement field is truly discontinuous and the jumps are non-homogeneous within each parent element [Alfaiate, Wells and Sluys (2000)]. More >

Shen Yubin¹, Xie Huicai^1,2, Den Wei¹

CMC-Computers, Materials & Continua, Vol.3, No.2, pp. 49-54, 2006, DOI:10.3970/cmc.2006.003.049

Abstract Bonding an overlay of new concrete onto the damaged concrete is a usual repair method. Because of the different shrinkage rate of the new and old concrete, restrained shrinkage cracks will appear in the new concrete. The cracks will reduce durability and strength of the repaired structure. A new repair method using an interface layer of carbon fiber reinforced cement mortar between new and old concrete was developed in this paper. The new method was found to be very effective in reducing shrinkage cracking of repaired beams and slabs. Comparing with normal repaired beams, the More >

S. N. Atluri¹

Structural Durability & Health Monitoring, Vol.1, No.1, pp. 1-20, 2005, DOI:10.3970/sdhm.2005.001.001

Abstract The solution of three-dimensional cracks (arbitrary surfaces of discontinuity) in solids and structures is considered. The BEM, developed based on the symmetric Galerkin BIEs, is used for obtaining the fracture solutions at the arbitrary crack-front. The finite element method is used to model the uncracked global (built-up) structure for obtaining the stresses in an otherwise uncracked body. The solution for the cracked structural component is obtained in an iteration procedure, which alternates between FEM solution for the uncracked body, and the SGBEM solution for the crack in the local finite-sized subdomain. In addition, some crack… More >

X. Neil Dong^1,2, Xiaohui Zhang¹, X. Edward Guo¹

Molecular & Cellular Biomechanics, Vol.2, No.2, pp. 63-68, 2005, DOI:10.3970/mcb.2005.002.063

Abstract In human cortical bone, cement lines (or reversal lines) separate osteons from the interstitial bone tissue, which consists of remnants of primary lamellar bone or fragments of remodeled osteons. There have been experimental evidences of the cement line involvement in the failure process of bone such as fatigue and damage. However, there are almost no experimental data on interfacial properties of cement lines in human cortical bone. The objective of this study is to design and assemble a precision and computer controlled osteon pushout microtesting system, and to experimentally determine the interfacial strength of cement… More >