Mesoporous nanostructured γ-Al2O3 powders were synthesized through multi- step precipitation procedures using the pH-swing technique. Structural and morphological characteristics in addition to the thermal behavior of the procured samples were characterized via X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), fourier transform infrared (FT-IR) ...

PURPOSE The development of prostate specific antigen (PSA) assays with detection limits of approximately 0.001 microgram./l. is technically feasible. We examined if serum PSA changes of 0.001 to 0.1 microgram./l. for up to 3 years after radical prostatectomy have any clinical value. MATERIALS AND METHODS We studied 148 patients with a postoperative PSA of less than 0.1 microgram./l. by a conv...

Domain structures in a tetragonal ferroelectric crystal were examined by transmission electron microscopy(TEM) before and after application of bipolar cyclic electric fields. Prior to the application of the bipolar field, the crystal was poled to an initial domain structure which consisted of a high volume fraction of c domains. Dispersed in the matrix of the c domains were two orthogonal sets ...

A pretreatment quality assurance program for volumetric techniques should include redundant calculations and measurement-based verifications. The patient-specific quality assurance process must be based in clinically relevant metrics. The aim of this study was to show the commission, clinical implementation, and comparison of two systems that allow performing a 3D redundant dose calculation. In...

A semantic net-based hypermedia approach to handling the semantics and behaviour of hypermedia structures emerging in a cooperative environment is presented. The semantic net-based hypermedia structures are visualised and manipulated in cooperative hypermedia browsers. Such hypermedia can be used to capture domain-specific information structures. Application-specific behaviour can be incorporat...

We propose a mixed finite volume finite element numerical method for solving the full Navier-Stokes-Fourier system describing the motion of a compressible, viscous, and heat conducting fluid. The physical domain occupied by the fluid has smooth boundary and it is approximated by a family of polyhedral numerical domains. Convergence and stability of the numerical scheme is studied. The numerical...

In this study, a 4D dosimetry concept was developed. This concept included a method for calculation of 3D reference absorbed dose matrices at every control point of the delivery using a clinical treatment planning system (TPS). Further, the gamma evaluation method was extended to incorporate the 4 dimension of the TPS calculated dose distributions. The applications of the 4D dosimetry concept o...

Considerable efforts have been done to produce realistic results when simulating interaction with elastic materials. Many applications such as surgery planning, medical training, or virtual sculpting would benefit from a plausible simulation scenario. However, even though many works have proposed very satisfactory results, realistic simulation of deformable bodies is still an open issue. One of...

Clinical and pathologic characteristics of stage T1c disease (nonpalpable and nonvisible cancer) was studied retrospectively in men who underwent radical prostatectomy in order to better understand this disease entity. Findings in stage T1c disease (16 patients) were directly compared with those in stage T2b disease (11 patients). No significant difference was observed between these groups with...

introduction: the use of stereological methods in evaluation of volume changes in vital organs such as kidney is very important. in this study, the volume of glomeruli in glycerol-induced acute renal failure in rats was determined. methods: 48 sprague-dawley male rats were divided into 2 groups (1control, 1experiment). experimental group was injected 10ml/kg of 50% glycerol intramuscularly, whi...