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  • Open Access

    ARTICLE

    Efficient Cohomology Computation for Electromagnetic Modeling

    Paweł Dłotko1, Ruben Specogna2

    CMES-Computer Modeling in Engineering & Sciences, Vol.60, No.3, pp. 247-278, 2010, DOI:10.3970/cmes.2010.060.247

    Abstract The systematic potential design is of high importance in computational electromagnetics. For example, it is well known that when the efficient eddy-current formulations based on a magnetic scalar potential are employed in problems which involve conductive regions with holes, the so-calledthick cutsare needed to make the boundary value problem well defined. Therefore, a considerable effort has been invested over the past twenty-five years to develop fast and general algorithms to compute thick cuts automatically. Nevertheless, none of the approaches proposed in literature meet all the requirements of being automatic, computationally efficient and general. In this More >

  • Open Access

    RESIDENT’S CORNER

    Case of a concurrent renal mass and extragonadal retroperitoneal teratoma

    Sapan N. Ambani1, Bruce L. Jacobs1, Aleksandr M. Perepletchikov2, Ronald L. Hrebinko, Jr.1

    Canadian Journal of Urology, Vol.16, No.2, pp. 4607-4610, 2009

    Abstract The presentation of a synchronous renal cell carcinoma (RCC) and germ cell tumor (GCT) is rare. We report the case of a 57 year-old male who presented with a right renal mass and retroperitoneal lymphadenopathy. He underwent a successful right partial nephrectomy and retroperitoneal lymph node dissection, and the subsequent pathology revealed a stage I clear cell RCC and a retroperitoneal teratoma with a component of benign prostatic tissue. We briefl y discuss the rarity of this occurrence, the pathological features that helped support this diagnosis, and the likely etiologies of these synchronous lesions. More >

  • Open Access

    EDITORIAL COMMENT

    Current status of robot-assisted surgery in urology: a multi-national survey of 297 urologic surgeons

    Michael Large, Kevin C. Zorn

    Canadian Journal of Urology, Vol.16, No.4, pp. 4741-4741, 2009

    Abstract This article has no abstract. More >

  • Open Access

    MINIMALLY INVASIVE AND ROBOTIC SURGERY

    Current status of robot-assisted surgery in urology: a multi-national survey of 297 urologic surgeons

    Khurshid A. Guru1,2, Abid Hussain2, Rameela Chandrasekhar2, Pamela Piacente2, Marlene Bienko2, Mark Glasgow4, Willie Underwood1,2, Gregory Wilding3, James L. Mohler1,2, Mani Menon5, James O. Peabody5

    Canadian Journal of Urology, Vol.16, No.4, pp. 4736-4741, 2009

    Abstract Purpose: The surgical robot is becoming an important tool for performance of minimally invasive surgical procedures around the world. We surveyed opinions about and utilization of robot-assisted surgery among urologic surgeons from 44 countries.
    Material and methods: A total of 297 surveys were completed from September to November 2008 by participating urologic surgeons polled at various national and international urologic meetings. The survey evaluated surgeon background, personal experience with minimally invasive surgery, institutional status regarding robotic surgery surgeons' attitudes towards robot-assisted surgery, in general, and prostate, bladder and kidney oncologic procedures, specifically.
    Results: Two hundred ninety-seven participants completed… More >

  • Open Access

    MINIMALLY INVASIVE AND ROBOTIC SURGERY

    In vivo partial nephrectomy of angiomyolipoma with concurrent transplantation

    James R. Johannes1, Cataldo Doria2, Costas D. Lallas1

    Canadian Journal of Urology, Vol.15, No.4, pp. 4184-4187, 2008

    Abstract Introduction/objective: To describe a novel management approach to patients presenting for living renal donation who have a suspicious renal mass or cyst and review the current literature for the management of renal allografts containing masses.
    Materials and methods: We retrospectively reviewed the preoperative, intraoperative, and postoperative records of both the donor and recipient for pertinent imaging, laboratory results, and complications. We also performed a Medline search to review the world literature of such cases, using the key words that we have listed for this article.
    Results: In our reported case, an angiomyolipoma (AML) was confirmed intraoperatively in the… More >

  • Open Access

    ARTICLE

    Discrete Constitutive Equations over Hexahedral Grids for Eddy-current Problems

    L. Codecasa1, R. Specogna2, F. Trevisan3

    CMES-Computer Modeling in Engineering & Sciences, Vol.31, No.3, pp. 129-144, 2008, DOI:10.3970/cmes.2008.031.129

    Abstract In the paper we introduce a methodology to construct discrete constitutive matrices relating magnetic fluxes with magneto motive forces (reluctance matrix) and electro motive forces with currents (conductance matrix) needed for discretizing eddy current problems over hexahedral primal grids by means of the Finite Integration Technique (FIT) and the Cell Method (CM). We prove that, unlike the mass matrices of Finite Elements, the proposed matrices ensure both the stability and the consistency of the discrete equations introduced in FIT and CM. More >

  • Open Access

    ABSTRACT

  • Open Access

    ARTICLE

    Single-channel response of hamster oocytes to fertilization with homologous spermatozoa

    LEONOR M.E. ITUARTE*, TERESA B. VIERA*, TEOBALDO A. SALDEÑA*, JUAN C. DE ROSAS**, MABEL FÓSCOLO**, JORGE E. IBÁÑEZ*, FERNANDO D. SARAVÍ*

    BIOCELL, Vol.30, No.1, pp. 43-49, 2006, DOI:10.32604/biocell.2006.30.043

    Abstract Electrophysiological events occur early after fertilization, along with changes in intracellular Ca2+ concentration . Passive electrical parameters were determined in golden hamster oocytes by whole cell patch-clamp method. In separate experiments the effect of 4-aminopyridine on resting oocytes was tested. The single-channel patch clamp configuration was employed to assess the electrical response to fertilization with homologous sperm. Structure of oocytes submitted to patch clamp was evaluated with scanning electron microscopy and found to be preserved.
    Oocyte diameter was 70.2 ± 2.2 µm; their resting parameters were: membrane potential 23.8 ± 0.8 mV; total membrane specific… More >

  • Open Access

    CASE REPORT

    An unusual case of concurrent breast and prostate cancer

    Tony Choon Seng Woo, Richard Choo, Sarat Chander

    Canadian Journal of Urology, Vol.11, No.5, pp. 2390-2392, 2004

    Abstract Breast and prostate cancer occurring concurrently is a rare occurrence. However, the recent literature has reported that there is an increased incidence of male breast cancer in prostate cancer patients. The authors describe the case of a man who presented with breast cancer, which was preceded by prostate cancer. There are some common features in terms of the etiology, diagnosis and treatment of these two tumors which are discussed. More >

  • Open Access

    EDITORIAL

    Computational Material Modeling: A Current Perspective

    S. Ghosh 1

    CMES-Computer Modeling in Engineering & Sciences, Vol.5, No.1, pp. 1-4, 2004, DOI:10.3970/cmes.2004.005.001

    Abstract This article has no abstract. More >

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