a catalytic-kinetic method for the determination of selenium is proposed. alizarin navy blue is reduced by sodium sulfide to from a colorless product. the reaction is accelerated by trace amounts of se (iv), and can be followed by measuring the decrease in absorbance of the dye at 620nm and 30 °c by the fixed time method. selenium can be determined in the range of 0.004 — 0.12 1.1g.m1-1 . ...

in this study simulation and optimization of an industrial acetylene hydrogenation reactor was studied. three well known kinetic models were used for a nearly similar catalyst to predict the industrial data. due to the complexity of the reactions, none of the offered kinetic models could be considered as an exact kinetic model and it is necessary to determine the kinetic parameters. one of the ...

the effect of electrical currents by different modalities on wound healing has been experimented. in this study a survey of the literature shows different results, and the mechanisms of action have not been elucidated for certain. the aim of this study was to compare the results obtained from low voltage-square wave stimulation of different frequencies. results show that the healing period for ...

obsessive-compulsive disorder (ocd) is a psychiatric disorder manifested by thoughts and impulses that produce anxiety and result in patients performing repetitive rituals. treatment generally consists of cognitive behavioral intervention and serotonin reuptake inhibitors. up to 40% of patients will have functional impairment that significantly affects their quality of life. in the late 1990’s,...

introduction: electrical low-frequency stimulation (lfs) has antiepileptic effect, but the role of different stimulation parameters on this effect has not been determined. in this study the effect of different lfs parameters (intensity, pulse duration and train duration) on piriform-cortex kindled seizures was investigated. methods: seizure was produced in animals using kindling model of epilep...

how to cite this article: noohi s, amirsalari s. history, studies and specific uses of repetitive transcranial magnetic stimulation (rtms) in treating epilepsy. iran j child neurol. winter 2016; 10(1):1-8.   abstract objective in this study, repetitive transcranial magnetic stimulation (rtms) and its specific use for treating epilepsy were carefully scrutinized.   materials & methods target res...

this paper considers a class of one-dimensional solidification problem in which kinetic undercooling is incorporated into the temperature condition at the interface. a model problem with nonlinear kinetic law is considered. the main result is an existence theorem. the mathematical effects of the kinetic term are discussed

Kinetic oscillatory stimulation (KOS) in the nasal cavity is a non-invasive cranial nerve stimulation method with promising efficacy for acute migraine and other inflammatory disorders. For a better understanding of the underlying neurophysiological mechanisms of KOS treatment, we conducted a resting-state functional magnetic resonance imaging (fMRI) study of 10 acute migraine patients and 10 n...

CONCLUSION Kinetic oscillation stimulation (KOS) of nasal mucosa at low frequency seems to be a possibly effective and safe short-term treatment of non-allergic nasal stuffiness. OBJECTIVE To assess the relief of rhinitis symptoms, especially stuffiness, by comparing active treatment, i.e. KOS at low frequency of the nasal mucosa, with placebo. METHODS Patients were randomized to active or ...