Zhen Luo^1,2, Nong Zhang^1,3, Yu Wang¹

CMES-Computer Modeling in Engineering & Sciences, Vol.83, No.1, pp. 73-96, 2012, DOI:10.3970/cmes.2012.083.073

Abstract This paper aims to present a physically meaningful level set method for shape and topology optimization of structures. Compared to the conventional level set method which represents the design boundary as the zero level set, in this study the boundary is embedded into non-zero constant level sets of the level set function, to implicitly implement shape fidelity and topology changes in time via the propagation of the discrete level set function. A point-wise nodal density field, non-negative and value-bounded, is used to parameterize the level set function via the compactly supported radial basis functions (CSRBFs)… More >

S. Oukach^1,2,3, H. Hamdi², M. El Ganaoui⁴, B. Pateyron¹

FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.2, pp. 173-196, 2012, DOI:10.3970/fdmp.2012.008.173

Abstract The splat formation is one of the basic processes in thermal spray coatings. The performance of these coatings is strongly related to the process of spreading and solidification of molten droplets. The aim of the present paper is to simulate the fluid flow, heat transfer and phase-change that occur when a micrometric molten droplet impacts onto a rigid substrate and to examine the effect of the substrate conditions, such as initial temperature and material on the solidification time and spreading process. The effect of thermal contact resistance is also investigated. The simulation model used is More >

Jack Barkin

Canadian Journal of Urology, Vol.18, Suppl.2, pp. 1-1, 2011

Abstract This article has no abstract. More >

Marina Cheng¹, Stephen W. Looney², James A. Brown¹

Canadian Journal of Urology, Vol.18, No.2, pp. 5644-5649, 2011

Abstract Purpose: Ureteroileal anastomotic stricture is a late complication of Bricker ileal conduits. We report our utilization of a “shield shaped” rather than a standard slit ileotomy.
Materials and methods: We retrospectively reviewed a single surgeon’s experience performing Bricker ileal conduits, initially using a slit incision, then a shield shaped ileotomy. Patient demographics, type of ileotomy, indication, history of prior radiation or chemotherapy, development of postoperative ureteroileal anastomotic stricture, date of stricture diagnosis, imaging modality, stricture treatment, outcome, and length of follow up were recorded.
Results: A total of 50 ileal conduit patients were identified between 2001-2009. A traditional… More >

Wen-Jun Xiao^1,3, Ding-Wei Ye^1,3, Xu-Dong Yao^1,3, Shi-Lin Zhang^1,3, Bo Dai^1,3, Chao-Fu Wang^2,3, Jian Wang^2,3, Hai-Liang Zhang^1,3, Yi-Jun Shen^1,3, Yao Zhu^1,3, Yi-Ping Zhu^1,3, Guo-Hai Shi^1,3, Chun-Guang Ma^1,3, Xiao-Jian Qin^1,3, Guo-Wen Lin^1,3

Canadian Journal of Urology, Vol.18, No.2, pp. 5619-5624, 2011

Abstract Introduction: To perform a head-to-head comparison among three generations of Partin tables, namely from 1997, 2001 and the last updated version of 2007, in a Chinese cohort of prostate cancer.
Material and methods: Clinical and pathological data of 198 consecutive Chinese patients were retrospectively analyzed, who underwent radical prostatectomy for clinically localized prostate cancer between January 2005 and May 2010. Three versions of the Partin tables were compared for their accuracy and performance to predict final pathological stage using receiver operating characteristic (ROC) curve.
Results: Of the whole cohort 58.6% were presented with organ-confined disease (OCD), 10.1% had… More >

Jonathan N. Warner¹, Rafael N. Nunez¹, Chinedu O. Mmeje¹, Thomas V. Colby², Robert G. Ferrigni¹, Mitchell R. Humphreys¹, Paul E. Andrews¹, Erik P. Castle¹

Canadian Journal of Urology, Vol.18, No.6, pp. 6043-6049, 2011

Abstract Introduction: We evaluate the impact of margin length, location, and pathologic stage on biochemical recurrence (BCR) after robot assisted radical prostatectomy (RARP) at 37 months of follow up.
Materials and methods: A total of 1420 patients underwent a robot assisted radical prostatectomy between March 2004 and May 2010. Patients who received adjuvant therapy, those who never achieved an undetectable prostate-specific antigen (PSA), and those who had less than 18 months of follow up were excluded. Patients were then divided and evaluated based on margin status.
Results: In total, 419 patients were included in the analysis. Eighty-three had a… More >

Sarfraz Ahmad, Rustom Pervez Manecksha, Ivor Michael Cullen, Robert Joseph Flynn, Thomas Eugene Dermott McDermott, Ronald Grainger, John Alan Thornhill

Canadian Journal of Urology, Vol.18, No.6, pp. 6025-6030, 2011

Abstract Introduction: Reliable quantification of prostate volume is important to correctly select patients with benign prostatic hyperplasia (BPH) most likely to benefit from medical therapy [e.g. 5 alpha-reductase inhibitors (5-ARIs)] and in selecting appropriate surgical approach. We aim to determine the reliability of digital rectal examination (DRE) in estimation of prostate volume which may be helpful in patient selection for 5-ARIs therapy.
Materials and methods: Patients requiring transrectal ultrasound (TRUS) guided prostate biopsy were recruited in this prospective study. DRE was performed twice for each patient. Clinicians categorized prostate volume on DRE into small, medium and large, and… More >

Channarong Wantha^a, Kriengkrai Assawamartbunlue^a,*

Frontiers in Heat and Mass Transfer, Vol.2, No.4, pp. 1-8, 2011, DOI:10.5098/hmt.v2.4.3006

Abstract This paper presents a study of the impact of the resonance tube on performance of a thermoacoustic stack. The resonance tube is a key component of a standing-wave thermoacoustic refrigerator. The appropriated resonance tube’s length leads to an increase of performance of the stack in terms of the temperature difference. The results also indicate that the optimal operating frequency differs from the design based on the equation of a half-wavelength. The resonance tube length is elongated to compensate for some effects that occur in the resonance tube, especially when the stack is placed in the More >

Sina Alavi, Mohammad Passandideh-Fard^*

Frontiers in Heat and Mass Transfer, Vol.2, No.2, pp. 1-9, 2011, DOI:10.5098/hmt.v2.2.3007

Abstract In this paper, a numerical study is performed to investigate the effects of thermal shrinkage on the deposition of molten particles on a substrate in a thermal spray process using the Volume-of-Fluid (VOF) method. Thermal shrinkage is a phenomenon caused by the variation of density during cooling and solidification of a molten metal. The Navier-Stokes equations along with the energy equation including phase change are solved using a 2D/axisymmetric mesh. The VOF method is used to track the free surface of molten particles, and an enthalpy-porosity formulation is used to model solidification. For the normal More >

YOUNG HWA LEE¹, HEE SAM NA¹ , SO YEON JEONG¹, SUNG HEE JEONG² , HAE RYOUN PARK³ , JIN CHUNG^1*

BIOCELL, Vol.35, No.2, pp. 43-50, 2011, DOI:10.32604/biocell.2011.35.043

Abstract MicroRNAs (miRNAs) are short RNA molecules that negatively regulate gene expression primarily by degrading target mRNA or inhibit the translation of protein product. Recently, many reports have shown the altered miRNA expression in various diseases. However, there are no reports on miRNA expression related to periodontitis. Thus, this study aimed to compare the miRNAs differentially expressed in healthy and chronic periodontitis tissues and to determine the miRNAs closely associated with chronic periodontitis. To find out the miRNAs differentially induced in healthy and chronic periodontitis tissues, miRNA microarray was carried out and the expression of miRNAs… More >