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11.
Ibrahim Unsal Abdurrahman Coskun Mustafa Serteser Tamer C. Inal Aysel Ozpinar 《Accreditation and quality assurance》2010,15(11):621-627
The main purpose of quality assurance procedures in clinical laboratories is to ensure that test results are appropriate to
maintain excellence in the diagnosis, monitoring, and treatment of disease. However, in current practice, no standardized
procedure or frequency for the evaluation of methods exists, particularly in external quality assessment. Furthermore, different
quality control materials are typically used for internal and external quality assessment. To overcome these discrepancies,
we used samples with the same matrix for both internal and external quality assessments of a group test performed in our laboratory.
We then calculated total error using real bias (target value obtained by reference method) and the imprecision of each test
and compared our results with the total error allowable, derived from biological variation data. We suggest that the strategy
of using the same matrix samples for both internal and external quality assessment is cost-effective, can be readily used
by staff, and will facilitate the standardization of quality control in clinical laboratories. 相似文献
12.
Abhijit P. BrahmeKaan Inal Raja K. MishraS. Saimoto 《International Journal of Plasticity》2011,27(8):1252-1266
Shape change of metal systems generates deformed microstructures of dislocation arrays that are comprised of walls of high density separating low density cells. The flow stresses of these composite structures are equilibrated by an evolving internal stress due to the blockage of dislocation passage resulting in kinematic hardening in the meso-scale. The method of intra-granular backstress of Eshelby using Kröner based approach in closed form formulae can easily be incorporated into a crystal-plasticity-based model to predict the kinematic hardening. We have previously developed finite element analyses based on the rate dependent crystal plasticity theory, which can incorporate electron backscatter diffraction (EBSD) maps. We will use this model with inclusion of the calculated backstress to investigate the effect of changes in strain paths. 相似文献
13.
Sahika Inal Jonathan Rivnay Anna I. Hofmann Ilke Uguz Muhammad Mumtaz Dimitrios Katsigiannopoulos Cyril Brochon Eric Cloutet Georges Hadziioannou George G. Malliaras 《Journal of polymer science. Part A, Polymer chemistry》2016,54(2):147-151
Recent applications of organic electrochemical transistors (OECTs) in bioelectronics motivate the search for new materials with mixed electronic and ionic conductivity. We investigate the characteristics of a series of poly(3,4-ethylenedioxythiophene) (PEDOT)-based materials with a new class of anionic polyelectrolytes used as dopants and stabilizers, replacing the traditionally used poly(styrene sulfonate) (PSS). We show that the backbone of the polyanion plays a major role in determining device performance, while its molecular weight and the counter ion used during PEDOT synthesis play a less important role. We find that transconductance increases with the degree of swelling of the film, consistent with enhanced ion transport. Finally, we identify a polymer that offers performance close to the state-of-the-art. This work highlights the importance of the polyanion phase as a means to control OECT performance. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 147–151 相似文献
14.
A micromechanical model using the scale transition method in elastoviscoplasticity has been developed to describe the behaviour of those austenitic steels that display a TWIP effect. A physically based constitutive equation at the grain scale is proposed considering two inelastic strain modes: crystallographic slip and twinning. The typical organizations of microtwins observed in electron microscopy are considered, and the twin–slip as well as the twin–twin interactions are accounted for. The parameters for slip are first fitted on the uniaxial tensile response obtained at intermediate temperatures (when twinning is inhibited). Then, the parameters associated with twinning are identified using the stress–strain curve at room temperature. The simulated results in both macro and micro scales are in good agreement with experimentally obtained results. 相似文献
15.
In this paper, a constitutive framework based on a rate-dependent crystal plasticity theory is employed to simulate the large strain deformation phenomena in hexagonal closed-packed (HCP) metals such as magnesium. The new framework is incorporated into in-house codes. Simulations are performed using the new crystal plasticity model in which crystallographic slip and deformation twinning are the principal deformation mechanisms. Simulations of various stress states (uniaxial tension, uniaxial compression and the so-called ring hoop tension test) for the magnesium alloy AM30 are performed and the results are compared with experimental observations of specimens deformed at 200 °C. Numerical simulations of forming limit diagrams (FLDs) are also performed using the Marciniak–Kuczynski (M–K) approach. With this formulation, the effects of crystallographic slip and deformation twinning on the FLD can be assessed. 相似文献
16.
The relativistic distorted-wave program of the flexible atomic code for calculating the cross sections for electron-impact excitation of ions between fine-structure levels is extended to get the multipole components of cross sections in the case of excitation by isotropic electrons. These components may be needed for interpreting the intensity and polarization of line emissions from thermal plasmas exposed to anisotropic radiations, such as the solar corona under photosphere irradiation. Illustrative numerical results are given for excitation of Si-like Fe12+ between the , and levels. These results can be useful in the analysis of infrared forbidden lines emitted from the solar corona. A comparison is made with the only published work based on the semi-relativistic distorted-wave approximation, showing some agreement for the excitation and discrepancies for the weak transition . 相似文献
17.
Sekkal-Haddouche A. F. Inal M. K. Benmouna M. 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2023,77(7):1-7
The European Physical Journal D - In the present work, we describe a new method, dressed cross-section model (DCSM), enabling implementation of large number of atomic transitions (~106 and more) in... 相似文献