نتایج جستجو برای: characterization tests
تعداد نتایج: 703569 فیلتر نتایج به سال:
When the dimensions of polycrystalline structures become comparable to the average grain size, some reliability issues can be reported for the moving parts of inertial microelectromechanical systems (MEMS). Not only the overall behavior of the device turns out to be affected by a large scattering, but also the sensitivity to imperfections gets enhanced. In this work, through on-chip tests, we e...
An alternative but very promising approach of traffic modeling is the use of fractal characterization to describe the high variability and bursty nature of network traffic. The aim of this dissertation is to contribute to this research approach, more precisely, to solve some problems in statistical testing, traffic characterization, modeling, and performance evaluation. First, the implications ...
introduction: while little is known about the molecular mechanisms that establish the apical growth patterns in fungal mycelia, recent research on the genetics of a. nidulans and n. crassa has provided considerable amount information on some genes involving in polarised cell growth. a.nidulans is particularly amenable to experimental analysis and is importantly related to other human pathogen f...
two peroxidases (ec. 1.11.1.7), pod i and pod ii were purified from the roots of cultivatedraphanus sativus l. var. cicil by one step ion-exchange chromatography after fractionation by acetone. the molecular weight of these enzymes were 43000 and 41000 daltons and rz 1.2 and 2.0 for pod i and pod ii, respectively. both enzymes consisted of a single polypeptide chain on sds-page. the maximum act...
OBJECTIVES To determine the pH over a period of 168 h and the ionic silver content in various concentrations and post-preparation times of aqueous silver nitrate solutions. Also, the possible effects of these factors on microleakage test in adhesive/resin restorations in primary and permanent teeth were evaluated. MATERIAL AND METHODS A digital pHmeter was used for measuring the pH of the sol...
Twin-disc tests present some limitations for wheel-rail wear characterization such as the obtained contact patch and error very low creepages. In this work, creepage phenomena are investigated ranging from 0.12% to 2.45%. To improve fitting of experimental with theoretical adhesion curve, a modification FASTSIM algorithm is proposed. A linear correlation has been found between slip area includi...
OBJECTIVE To determine the reference intervals for thyroid function tests and the prevalence of thyroid autoimmunity in the Saudi population. METHODS A cross-sectional prospective study was conducted in King Khalid University Hospital, Riyadh, Saudi Arabia from January to June 2013. History and physical examination were obtained. Thyroid-stimulating hormone (TSH), free thyroxine (FT4), and ...
Methods are described for the rapid detection of beta-D-glucosidase and phosphatase in mycoplasma cultures using fluorogenic 4-methylumbelliferone substrates. These methods were applied to a selection of mycoplasma cultures and were compared with the conventionally used tests for these enzymes. Results were similar by both methods, but the fluorogenic tests could be read after 1 h, whereas the ...
Traumatic damage to the brainstem occurs frequently when the brain skull complex experiences injurious loading especially during those traumatic situations that produce diffuse axonal injury (DAI). DAI has been shown to be dependent on load direction and correlated with regional tissue deformation in response to rotational inertial loads. Possible mechanisms for the selective vulnerability of t...
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