Using lightly polluted water of WenYu River in Beijing as the research object and making use of electrochemistry method to treat it,the effects of the changes of the chloride concentration in the water and cell voltag...
Using lightly polluted water of WenYu River in Beijing as the research object and making use of electrochemistry method to treat it,the effects of the changes of the chloride concentration in the water and cell voltage on removing pollutants were *** results revealed that electrochemical oxidation method could partly remove ammonia NH-N,TN and COD,the highest removal rate of the NH-N,TN and COD were able to achieve 95%,89%and 68%*** the higher the chloride concentration in the water,the higher the removal rate to pollutants,along with the increase of cell voltage,the removal rates of pollutants increased *** the addition of the chloride concentration and the increase of cell voltage both have their limitations,in this way,the removal rates of the pollutants could be guaranteed. Considering the power consumption and other factors,the optimal running conditions of this experiment were the electrolysis time 20 min,the cell voltage 7 V,the chloride solution concentration of the addition 5.0mol/L and the dosing amount 2 L/*** the course of chemical reaction of electrochemical process was expressed too.
The multiwalled carbon nanotube-nickel hydroxide composite film used to modify glassy carbon electrode was prepared and confirmed by transmission electron microscopy and cyclic voltammetry. The process and mechanism o...
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The multiwalled carbon nanotube-nickel hydroxide composite film used to modify glassy carbon electrode was prepared and confirmed by transmission electron microscopy and cyclic voltammetry. The process and mechanism of film formation were discussed in detail. The electrode modified with the composite film exhibited good catalytic activity toward electrochemical oxidation of hydrogen peroxide in 0.1mol/L sodium hydroxide solution. Various factors affecting the electrocatalytic activity of nickel hydroxide film were investigated. The anodic peak current increased with the increased concentration of hydrogen peroxide. The linear range for the determination of hydrogen peroxide was from 1.510-6mol/L to 2.510-3mol/L with the detection limit 6.110-7mol/L (S/N=3). And the proposed method was applied to the determination of hydrogen peroxide in disinfector with higher sensitivity and lower detection limit.
A new method called the adhesive-bonded anchorage pullout test is proposed in the paper to estimate the in-place concrete compressive strength. In this method, a threaded metal insert is anchored into the concrete by ...
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A new method called the adhesive-bonded anchorage pullout test is proposed in the paper to estimate the in-place concrete compressive strength. In this method, a threaded metal insert is anchored into the concrete by means of a high strength adhesive. To estimate the concrete compressive strength, the Pullout force when the anchorage system fails is measured. The embedded depth and the diameter of the reaction ring are determined by theoretical and experimental analysis. The empirical correlation relationships between the pullout forces of this new method and the compressive strengths of concrete cubes are presented for concrete specimens with varying concrete mixes in the 10-80 MPa strength range. In order to assess the accuracy of this method on site, verification tests are undertaken on a number of concrete structures. The experimental and analytical studies show that the newly proposed method is accurate in estimating the in-place concrete compressive strength.
The effect of IF(Intermediate Frequency)analog AGC on QPSK/OQPSK signal detection is evaluated for LEO satellite system where Doppler drift,large dynamic range of signal power and low Eb/No condition are difficult to ...
The effect of IF(Intermediate Frequency)analog AGC on QPSK/OQPSK signal detection is evaluated for LEO satellite system where Doppler drift,large dynamic range of signal power and low Eb/No condition are difficult to deal with. The way of setting reference value of logarithmic power based AGC is *** accumulation and non-coherent accumulation are used for detecting,while signal's PDF and performance *** times are derived mathematically. Experiment shows that with 60KHz Doppler offset,Eb/No=0dB under QPSK/OQPSK,only 16bits was consumed to detect the signal with 99.9%detection probability and 0.1%false alarm probability.
The effect of IF (Intermediate Frequency) analog AGC on QPSK/OQPSK signal detection is evaluated for LEO satellite system where Doppler drift, large dynamic range of signal power and low Eb/No condition are difficult ...
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