Y. Tomita ¹, M. Uchida ¹

CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.3, pp. 239-248, 2005, DOI:10.3970/cmes.2005.010.239

Abstract In this study, we clarified the micro- to mesoscopic deformation behavior of a semicrystalline polymer by employing a large-deformation finite element homogenization method. The crystalline plasticity theory with a penalty method for the inextensibility of the chain direction and the nonaffine molecular chain network theory were applied for the representation of the deformation behavior of the crystalline and amorphous phases, respectively, in the composite microstructure of the semicrystalline polymer. The 3D structure of lamellae in the spherulite of high-density polyethylene was modeled, and the tensile and compressive deformation behaviors were investigated. A series of computational More >

Michihiko Nakagaki¹, Shuji Takashima², Ryosuke Matsumoto¹, Noriyuki Miyazaki²

CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.3, pp. 199-208, 2005, DOI:10.3970/cmes.2005.010.199

Abstract The present paper focuses on the micromechanical phenomena occurring in the polycrystalline metal materials. Correlations between the material hardening and the plastic lattice dislocation were discussed with the presence of the grain boundary. The characteristic distribution of the plastic strain gradient is numerically recognized, and hence the validity of incorporating the strain gradient term in the constitutive law is demonstrated. Also, the modeling of the inclusion interface sliding and debonding was performed on the equivalent inclusion theory to develop the constitutive law for the composite. The sliding model is considered to be effective to model More >

Marcello Lappa^{1, 2}

FDMP-Fluid Dynamics & Materials Processing, Vol.1, No.1, pp. 1-20, 2005, DOI:10.3970/fdmp.2005.001.001

Abstract Possible natural transport mechanisms in cubical and shallow cavities with different heating conditions (from below or from the side) are investigated by means of numerical solution of the non-linear model equations and multiprocessor computations. Attention is focused on a variety of three-dimensional steady effects that can arise in such configurations in the case of low-Pr liquids (silicon melt) even for relatively small values of the temperature gradient due to localized boundary effects and/or true instabilities of the flow. Such aspects are still poorly known or completely ignored owing to the fact that most of the More >

D.L. Young^1,3, C.S. Chen², T.K. Wong³

CMC-Computers, Materials & Continua, Vol.2, No.4, pp. 267-276, 2005, DOI:10.3970/cmc.2005.002.267

Abstract A meshless time domain numerical method based on the radial basis functions using multiquadrics (MQ) is employed to simulate electromagnetic field problems by directly solving the time-varying Maxwell's equations without transforming to simplified versions of the wave or Helmholtz equations. In contrast to the conventional numerical schemes used in the computational electromagnetism such as FDTD, FETD or BEM, the MQ method is a truly meshless method such that no mesh generation is required. It is also easy to deal with the appropriate partial derivatives, divergences, curls, gradients, or integrals like semi-analytic solutions. For illustration purposes, More >

A. Cazzani¹, E. Garusi², A. Tralli³, S.N. Atluri⁴

CMC-Computers, Materials & Continua, Vol.2, No.1, pp. 23-38, 2005, DOI:10.3970/cmc.2005.002.023

Abstract Fibre-reinforced plates and shells are finding an increasing interest in engineering applications. Consequently, efficient and robust computational tools are required for the analysis of such structural models. As a matter of fact, a large amount of laminate finite elements have been developed and incorporated in most commercial codes for structural analysis. \newline In this paper a new laminate hybrid assumed-strain plate element is derived within the framework of the First-order Shear Deformation Theory (i.e. assuming that particles of the plate originally lying along a straight line which is normal to the undeformed middle surface remain… More >

Margarita Hollingsworth¹, Francisco Quiroz², Michael L. Guralnick¹

Canadian Journal of Urology, Vol.11, No.1, pp. 2163-2166, 2004

Abstract Objective: To review our experience in managing the uncommon problem of a retained Foley catheter secondary to an inability to deflate the catheter balloon.
Methods: A chart review of 13 patients in whom it was not possible to deflate their Foley catheter balloons was performed. We review the various techniques used to deflate their catheter balloons and present a modified algorithm.
Results: In 23% of our patients, passive aspiration with a syringe successfully deflated the balloon. In 31% of our patients, cutting the catheter with or without subsequent aspiration successfully deflated the balloon. In 15% of our patients, More >

Sean van Diepen, John Grantmyre

Canadian Journal of Urology, Vol.11, No.1, pp. 2139-2140, 2004

Abstract Double-J ureteral stents facilitating the drainage of urine from the kidney to the bladder are widely used. Stents designed for patient self-removal are commonplace. We report a case of urosepsis that lead to the incidental discovery of a failed self-removal of a double-J ureteral stent. The retrieval cord broke during self-removal and the patient mistook the string for the stent. Adequate patient education is essential to assure successful self-removal. More >

F. Dunet¹, Ch. Pfister¹, M. Deghmani², Y. Meunier², G. Demeilliers-Pfister², Ph. Grise¹

Canadian Journal of Urology, Vol.11, No.2, pp. 2200-2204, 2004

Abstract Objectives: Improvement of radical prostatectomy surgical technique remains an objective for urological practice. The aim of this study was to evaluate the potential benefit of intra and postoperative epidural versus general anesthesia alone.
Material and methods: The authors retrospectively analyzed 62 consecutive cases of patients who underwent radical retropubic prostatectomy over a 2-year period. The mean age was 65.5 years (51-75). Two groups were selected: group I = 19 patients, who received epidural anesthesia in association with general anesthesia and group II = 43 patients with general anesthesia alone. Both groups were similar for ASA score, Body… More >

Ross E. Gray¹, Laurence H. Klotz²

Canadian Journal of Urology, Vol.11, No.3, pp. 2285-2289, 2004

Abstract It has been extremely difficult for men with prostate cancer to obtain reasonable estimates of the likelihood of remaining potent after first line therapy, partly because of differences in defining potency. If, as in more recent studies, the definition requires that men are usually (not just occasionally) able to get and sustain an erection, then the picture is not encouraging. Additional strategies are needed to help men sustain sexual activity. In this paper we draw on the experiences of a rather remarkable prostate cancer patient to help consider the possibilities for a different kind of… More >

Richard D. Sowery, D. Robert Siemens

Canadian Journal of Urology, Vol.11, No.5, pp. 2407-2410, 2004

Abstract Objective: To characterize tumor growth of patients managed conservatively for renal cell carcinoma.
Methods: Patients electing conservative management of radiographically determined renal cell carcinomas were referred to a surveillance database. Exclusion criteria consisted of locally advanced disease (>T2) and those with metastatic disease. Clinical follow-up included renal imaging with ultrasound or computed tomography at least every 6 months.
Results: Twenty-two patients were originally managed conservatively, two of whom subsequently underwent nephrectomy because of rapid tumor growth. Mean follow-up was 26 months. Mean tumor volume and diameter at presentation was 62.4 cc and 4.08 cm respectively. Overall tumor growth More >