Lorenzo Codecasa¹, Francesco Trevisan²

CMES-Computer Modeling in Engineering & Sciences, Vol.59, No.2, pp. 155-180, 2010, DOI:10.3970/cmes.2010.059.155

Abstract Electromagnetic problems spatially discretized by the so called Discrete Geometric Approach are considered, where Discrete Counterparts of Constitutive Relations are discretized within an Energetic Approach. Pairs of oriented dual grids are considered in which the primal grid is composed of (oblique) parallelepipeds, (oblique) triangular prisms and tetrahedra and the dual grid is obtained according to the barycentric subdivision. The focus of the work is the evaluation of the constants bounding the approximation error of the electromagnetic field; the novelty is that such constants will be expressed in terms of the geometrical details of oriented dual More >

Lorenzo Codecasa¹, Francesco Trevisan²

CMES-Computer Modeling in Engineering & Sciences, Vol.58, No.1, pp. 15-44, 2010, DOI:10.3970/cmes.2010.058.015

Abstract This paper starts from the spatial discretization of an electromagnetic problem over pairs of oriented grids, one dual of the other, according to the so called Discrete Geometric Approach(DGA) to computational electromagnetism; the Cell Method or the Finite Integration Technique are examples of such an approach. The core of the work is providing for the first time a convergence analysis when the discrete counter-parts of constitutive relations are computed by means of an energetic framework. More >

J.T. Zhou¹, Q.W. Ma^1,2

CMES-Computer Modeling in Engineering & Sciences, Vol.56, No.2, pp. 179-210, 2010, DOI:10.3970/cmes.2010.056.179

Abstract In this paper, the Meshless Local Petrov-Galerkin method based on Rankine source solution (MLPG_R) is further developed to model 3D breaking waves. For this purpose, the technique for identifying free surface particles called Mixed Particle Number Density and Auxiliary Function Method (MPAM) and the semi-analytical technique for estimating the domain integrals for 2D cases are extended to 3D cases. In addition, a new semi-analytical technique is developed to deal with the local spherical surface integrals. The numerical results obtained by the newly developed method will be compared with experimental data available in literature and satisfactory More >

O. Allix¹, P. Kerfriden¹, P. Gosselet¹

CMES-Computer Modeling in Engineering & Sciences, Vol.55, No.3, pp. 271-292, 2010, DOI:10.3970/cmes.2010.055.271

Abstract We present numerical enhancements of a multiscale domain decomposition strategy based on a LaTIn solver and dedicated to the computation of the debounding in laminated composites. We show that the classical scale separation is irrelevant in the process zones, which results in a drop in the convergence rate of the strategy. We show that performing nonlinear subresolutions in the vicinity of the front of the crack at each prediction stage of the iterative solver permits to restore the effectiveness of the method. More >

Z. Y. Yan^1,2, J. Zhang¹, W. Ye¹, T.X. Yu¹

CMES-Computer Modeling in Engineering & Sciences, Vol.55, No.1, pp. 33-60, 2010, DOI:10.3970/cmes.2010.055.033

Abstract An 3-D precorrected-FFT accelerated BEM approach for the linear elastic analysis of porous solids with randomly distributed pores of arbitrary shape and size is described in this paper. Both the upper bound and the lower bound of elastic properties of solids with spherical pores are obtained using the developed fast BEM code. Effects of porosity and pore shape on the elastic properties are investigated. The performance of several theoretical models is evaluated by comparing the theoretical predictions with the numerical results. It is found that for porous solids with spherical pores, the performances of the More >

Fei Jia¹, Xiu-Peng Zheng^1,2, Yan-Ping Cao^1,3, Xi-Qiao Feng¹

CMC-Computers, Materials & Continua, Vol.18, No.2, pp. 105-120, 2010, DOI:10.3970/cmc.2010.018.105

Abstract Recently, a novel technique based on the wrinkling of a bilayer composite film resting on a compliant substrate was proposed to measure the elastic moduli of thin films. In this paper, this technique is studied via theoretical analysis and finite element simulations. We find that under an applied compressive strain, the composite system may exhibit various buckling modes, depending upon the applied compressive strain, geometric and material parameters of the system. The physical mechanisms underlying the occurrence of the two most typical buckling modes are analyzed from the viewpoint of energy. When the intermediate layer More >

Jamil Rehman¹, Bilal Chughtai², Khurshid Guru³, Ridwan Shabsigh⁴, David B. Samadi⁵

Canadian Journal of Urology, Vol.16, No.1, pp. 4490-4494, 2009

Abstract Objective: To present our technique for the management of an enlarged median lobe when the ureteral orifices are close to the bladder neck during robotic-assisted radical prostatectomy.
Materials and methods: From January 2005 to January 2007, we performed over 600 robotic assisted radical prostatectomies. We had 63 patients (10%) with enlarged median lobes. Of these patients, two (5.7%) had their ureteral orifices in close proximity to the bladder neck. An additional patient, without a median lobe, had his orifices very close to the bladder neck. To aid in the management of their median lobes, all three patients… More >

David E. Rapp¹, Lambda P. Msezane¹, W. Stuart Reynolds¹, Tamara L. Lotan², Piotr Obara¹, R. Corey O’Connor³, Jerome B. Taxy², Glenn S. Gerber¹, Gregory P. Zagaja¹

Canadian Journal of Urology, Vol.16, No.1, pp. 4484-4489, 2009

Abstract Objectives: We sought to evaluate the ability of biopsy core recutting to increase cancer detection in patients with high grade prostatic intraepithelial neoplasia (HGPIN).
Methods: This prospective study encompasses all patients undergoing 12 core TRUS guided prostate biopsy between February 2004 and January 2007. In patients with HGPIN on initial biopsy, the paraffin blocks were resampled for cancer by additional deeper levels per core. Additional analysis was performed in the patients with HGPIN in order to detect whether significant differences in prebiopsy variables were associated with patients subsequently found to have benign versus carcinoma on recutting. Last,… More >

Michaël Peyromaure^1,2, Kaili Mao^1,2, Yinghao Sun^2,3, Shujie Xia⁴, Nin Jiang⁵, Shiqing Zhang⁶, Gongxian Wang⁷, Zhongmin Liu², Bernard Debré^1,2

Canadian Journal of Urology, Vol.16, No.1, pp. 4472-4477, 2009

Abstract Objective: To compare the detection and management of prostate cancer in one French and six Chinese urological institutions.
Patients and methods: All the patients subjected to prostate biopsy for suspected prostate cancer in six Chinese urological institutions and in the department of urology of the Cochin hospital, France, between January 2003 and December 2005 were included. The characteristics of patients and tumors, and the management of prostate cancer were then analyzed.
Results: In the Chinese institutions, 95.8% of patients undergoing prostate biopsy presented with urinary disorders. The rate of abnormal digital rectal examination (DRE) ranged from 29.2% to… More >

Sujeet S. Acharya, Mohan S. Gundeti, Gregory P. Zagaja, Arieh L. Shalhav, Kevin C. Zorn

Canadian Journal of Urology, Vol.16, No.2, pp. 4601-4606, 2009

Abstract Background: Although malformations of the genitourinary tract are typically identified during childhood, they can remain silent until incidental detection in evaluation and treatment of other pathologies during adulthood. The advent of the minimally invasive era in urologic surgery has given rise to unique challenges in the surgical management of anomalies of the genitourinary tract.
Objective: This article reviews the embryology of anomalies of Wolffian duct (WD) derivatives with specific attention to the seminal vesicles, vas deferens, ureter, and kidneys. This is followed by a discussion of the history of the laparoscopic approach to WD derivative anomalies. Finally,… More >