Silver nanoparticles (AgPNs) were prepared by high-voltage electrochemical methods using silver anode to produce silver ions and hydrogen gas at the cathode from electrolysis of distilled water as solvents. The electrolyte solution... more
Silver nanoparticles (AgPNs) were prepared by high-voltage electrochemical methods using silver anode to produce silver ions and hydrogen gas at the cathode from electrolysis of distilled water as solvents. The electrolyte solution resulting from the AgPNs product obtained does not contain ions of the electrolyte solution such as conventional chemical or electrochemical methods. Silver anode dissolution process will provide Ag+ and disperse it into distilled water. The process of generating H2 from the electrolysis of H2O disperses into distilled water and escapes upward towards the anode due to the arrangement of the electrolytic vaporizer vertically above the anode and the cathode below. Ag+ and H2's encounter in the aqueous solution will take the oxidation-reduction reaction to form AgPNs. Due to the high-voltage DC electrolytic processes that generate gas on the electrodes, both high-voltage and high magnetic fields, as well as high water-distillation resistance, will increa...
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Nano silver was known as a bactericidal agent for almost all bacterial species and has been intensively investigated over the world to apply for disinfection in different fields of human activities and environmental protection.... more
Nano silver was known as a bactericidal agent for almost all bacterial species and has been intensively investigated over the world to apply for disinfection in different fields of human activities and environmental protection. Specifically, genital exudate media contain numerous dangerous bacteria such as Neisseria gonorrhoeae, Enterococcus faecalis, Staphylococcus aureus, Candida albicans etc. which as a rule are drug-resistant with respect to antibiotics. This research presents the results of the application of nanosilver in replacing antibiotics in elimination of the above mentioned microorganisms by using low nanosilver concentrations of about 0.01 mg/cm2 immobilized on non-woven fabric. The experimental data showed that nanosilver-impregnated fabric samples at a concentration 0.01 mg/cm2 gave antibacterial rings of 10 mm, 9 mm and 8 mm, respectively, for N. gonorrhoeae, Candida albicans + E.coli and Candida albicans + E.coli + S. aureus.
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In this paper, we propose an approach for stable control of a class of nonlinear systems, which can be expressed in a state-feedback linearizable form with unknown nonlinear functions of states. The idea is to replace the unknown... more
In this paper, we propose an approach for stable control of a class of nonlinear systems, which can be expressed in a state-feedback linearizable form with unknown nonlinear functions of states. The idea is to replace the unknown functions with estimated (not need to be accurate) functions and to use a universal approximator to compensate for the error caused by
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ABSTRACT The cell pressure of sealed lead acid accumulators in the overcharge phase and in the subsequent rest phase is calculated on the basis of the diffusion determination of oxygen reduction. It is considered that the PbSO4 forming in... more
ABSTRACT The cell pressure of sealed lead acid accumulators in the overcharge phase and in the subsequent rest phase is calculated on the basis of the diffusion determination of oxygen reduction. It is considered that the PbSO4 forming in a selfdischarging reaction in the rest phase covers the effective Pb reaction surface. A calculated and an experimentally measured curve are compared, and a nearly complete agreement has been found. The influence of parameters: effective reaction surface, overcharge current, free gas volume of the cell, hydrogen formation rate and PbSO4 crystallite size on cell pressure is discussed.
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Physical examination, ultrasonography, and laboratory tests fail to reliably establish the preoperative diagnosis of tubal rupture in patients with ectopic pregnancy (EP), leading to a high rate of diagnostic laparoscopy. The aim of this... more
Physical examination, ultrasonography, and laboratory tests fail to reliably establish the preoperative diagnosis of tubal rupture in patients with ectopic pregnancy (EP), leading to a high rate of diagnostic laparoscopy. The aim of this study was to construct and to evaluate a clinical prediction rule for tubal rupture screening based on a self-assessment questionnaire, among patients with EP. A standardized questionnaire was constructed via semistructured interviews of patients with acute pelvic pain. Features associated with tubal rupture were then identified in 141 prospectively included patients with tubal pregnancy, including 30 with tubal rupture, in five hospitals. Multiple logistic regression was used to select the best combination of independent features for predicting tubal rupture. Cross-validation was with the jackknife method. The main outcome measure was diagnostic accuracy of the questionnaire for ruling out tubal rupture. Eighty-nine items characterizing acute pelvic pain were identified. Among them, four contributed independently to the diagnosis of tubal rupture: vomiting during pain, diffuse abdominal pain, acute pain for longer than 30 minutes, and flashing pain. The presence of one or more of these features had 93% sensitivity (95% confidence interval [CI] = 84% to 100%) and 44% specificity (95% CI = 35% to 53%) for tubal rupture, with a negative likelihood ratio for ruling out tubal rupture of 0.16. These results suggest that a standardized questionnaire may contribute to ruling out tubal rupture in patients with EP.