R. Han¹, M.S. Ingber¹, H.L. Schreyer¹

CMC-Computers, Materials & Continua, Vol.4, No.3, pp. 163-176, 2006, DOI:10.3970/cmc.2006.004.163

Abstract Decohesion is an important failure mode associated with fiber-reinforced composite materials. Analysis of failure progression at the fiber-matrix interfaces in fiber-reinforced composite materials is considered using a softening decohesion model consistent with thermodynamic concepts. In this model, the initiation of failure is given directly by a failure criterion. Damage is interpreted by the development of a discontinuity of displacement. The formulation describing the potential development of damage is governed by a discrete decohesive constitutive equation. Numerical simulations are performed using the direct boundary element method. Incremental decohesion simulations illustrate the progressive evolution of debonding zones More >

L. Gornet¹, S. Marguet², G. Marckmann³

CMC-Computers, Materials & Continua, Vol.4, No.2, pp. 63-74, 2006, DOI:10.3970/cmc.2006.004.063

Abstract The purpose of the present study is to determine the components of the effective elasticity tensor and the failure properties of Nomex^® honeycomb cores. In order to carry out this study, the NidaCore software, a program dedicated to Nomex®Cores predictions, has been developed using the Finite Element tool Cast3M-CEA. This software is based on periodic homogenization techniques and on the modelling of structural instability phenomena. The homogenization of the periodic microstructure is realized thanks to a strain energy approach. It assumes the mechanical equivalence between the microstructures of a RVE and a similar homogeneous macroscopic volume.… 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 >

Lingfei Gao¹, Xiaoping Zheng^1,2, Zhenhan Yao¹

CMC-Computers, Materials & Continua, Vol.3, No.1, pp. 25-36, 2006, DOI:10.3970/cmc.2007.003.025

Abstract A general numerical approach is developed to model the elastic behaviours and failure processes of heterogeneous materials. The heterogeneous material body is assumed composed of a large number of convex polygon lattices with different phases. These phases are locally isotropic and elastic-brittle with the different lattices displaying variable material parameters and a Weibull-type statistical distribution. When the effective strain exceeds a local fracture criterion, the full lattice exhibits failure uniformly, and this is modelled by assuming a very small Young modulus value. An auto-select loading method is employed to model the failure process. The proposed More >

Judd W. Moul¹, Fred Saad²

Canadian Journal of Urology, Vol.12, Suppl.3, pp. 25-27, 2005

Abstract We currently lack a prospective, randomized, multicenter trial, to reassure low-risk prostate cancer patients, especially younger ones, that watchful waiting is a legitimate treatment. To better manage these patients, we need to: first, confirm that the patient has low-risk prostate cancer; second, adapt the treatment to the risk (i.e., if therapy is chosen over watchful waiting, it should be monotherapy not multiple therapy); third, be aware of age migration; fourth, know that radical prostatectomy and radiation were shown to be very effective for these patients at 10-year follow-up; and lastly, make an effort to better More >

Laurence H. Klotz

Canadian Journal of Urology, Vol.12, Suppl.3, pp. 21-24, 2005

Abstract Background: Many newly diagnosed patients with prostate cancer have "good risk" disease. The challenge is to identify the minority of these patients with aggressive disease and offer them curative treatment, while sparing the remainder the morbidity of unnecessary treatment.
Purpose: To examine the results of active surveillance with selective delayed intervention in good risk prostate cancer patients.
Materials and methods: This was a prospective phase II study of active surveillance of 299 patients. Eighty percent (239 patients) met the criteria for good risk disease: PSA < 10 ng/mL, Gleason ≤ 6, T ≤ 2a. Twenty percent of patients,… More >

William A. Gourlay¹, Lynn Stothers², Li Liu^1,3

Canadian Journal of Urology, Vol.12, No.1, pp. 2511-2520, 2005

Abstract Introduction: Live donor kidney transplantation (LDKT) is both medically and economically superior to cadaver kidney transplantation in the treatment of patients with chronic renal failure. Unfortunately, fewer than 50% of patients on the transplant waiting list have a relative or friend who contacts the transplant program about possible donation. We hypothesized that both the potential recipient and potential donor have identifiable and modifiable characteristics that contribute to the likelihood of a live donor transplant.
Materials and methods: Specifically-designed and validated questionnaires addressing personal characteristics, knowledge and beliefs about LDKT were mailed to patients who had previously received… More >

D. Robert Siemens¹, Karleen M. Schulze², William J. Mackillop², Michael D. Brundage², Patti A. Groome²

Canadian Journal of Urology, Vol.12, No.2, pp. 2568-2574, 2005

Abstract Introduction and objective: Despite the high incidence of prostate cancer in Canada, there is currently limited information describing how these patients are being managed. The aim of this study was to review the surgical waiting times for radical prostatectomy in Ontario, utilizing existing population-based cancer databases, and to describe factors associated with prolonged waiting times.
Methods: This is a retrospective, population-based, observational study of men diagnosed with prostate cancer in Ontario between 1980 and 2000. The sources of data include the Ontario Cancer Registry linked to hospital discharge data, as well as census data from Statistics Canada.… More >

Luc Valiquette, Francesco Montorsi, Wayne J. G. Hellstrom, François Giuliano, Martin Homering, Terry Taylor, Ian Eardley

Canadian Journal of Urology, Vol.12, No.3, pp. 2699-2699, 2005

Abstract This article has no abstract. More >

Luc Valiquette¹, Francesco Montorsi², Wayne J. G. Hellstrom³, Francois Giuliano⁴, Martin Homering⁵, Terry Taylor⁶, Ian Eardley⁷

Canadian Journal of Urology, Vol.12, No.3, pp. 2687-2698, 2005

Abstract Objective: To assess success rates in ability to penetrate (Sexual Encounter Profile question 2 [SEP2]) and maintain erections to completion of intercourse (SEP3) from time of dosing to start of sexual activity in a retrospective analysis of two pivotal trials.
Methods: In two randomized, double-blind studies, men with ED for >6 months received vardenafil 5 mg, 10 mg, or 20 mg or placebo for 12-26 weeks. Patients were instructed to start sexual activity 1 hour after dosing. In this retrospective pooled analysis, patient diary questions through week 12 were analyzed, providing attempt data was recorded 0-12 hours… More >