Papers by Keyword: Drift

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Authors: Zi Qiang Wang, Di Li, Min Cheng Zhong, Jin Hua Zhou, Yin Mei Li, Fan Rang Kong
Abstract: One limitation on the performance of optical tweezers (abbreviated as OT) is the noise inherently present in each setup. Therefore, it is the desire to minimize and possibly eliminate the noise from the OT experiments. In this paper, a filter method based on wavelet analysis is proposed. At first we investigate the properties of OT outputs noise, and introduce the wavelet filtering method in simply. Following, we study on the OTs drift signal using different base: db4 and Haar. And also study on the signal using different filter algorithm: the soft,the hard threshold,and compulsive filter. These main conclusions based on foregoing analysis are reached: more larger the resolving scale is, more perfect the filtering effect is. The soft threshold value filtering effect is better than that of the hard threshold value filtering at the cost of calculation when the threshold value is same. The variance of the compulsive filtering is least when both the wavelet and the resolving scale are same for these filtering methods. For the compulsive filtering with same wavelets, the filtering effect of harr is better than that of db4 and the calculation of the former is fewer. Analysis the dynamic output of OT with different algorithm, it also shows that the effect of filter with the compulsive filtering is better than others. Accordingly, we found that applying the compulsive filtering with the Harr wavelet base and suitable resolving scale to the signal processing of OT outputs signal is helpful for the OT design and construction.
Authors: N.M. Johnson, C. Herring
Authors: Fang Dong Hou, Fang Wang, Xiao Bao Nie
Abstract: Excessive propagation of Tubifex tubifex in eutrophic source water can result in the emergence of them in the drinking water plant, which has been a troublesome problem in recent years. Our objectives were to investigate the driving force of drift and quantify the influence of temperature and DO on the worm drift. Results showed that one of the major driving forces of the worm drift was water flow, which exhibited its effect by direct shear stress on the worm or inducing sediment suspension. The worm drift rates were increased with the decrease of temperature and DO content. The results confirmed that worm drift from sediment to overlying water, which was induced by water flow and could be influenced by temperature, DO content and sediment property was the main cause of worm pollution in drinking water plant.
Authors: Lukas Smolarik, Dusan Mudroncik, Lubos Ondriga
Abstract: Electrocardiography (ECG) is a diagnostic method that allows sensing and record the electric activity of heart [. The measurement of electrical activity is used as a standard twelve-point system. At each of these leads to measure the useful signal and interference was measured. The intensity of interference depends on the artefacts (electrical lines, brum, motion artefacts, muscle, interference from the environment, etc.). For correct evaluation of measured signal there is a need to processing the measured signal to suitable form. At present, the use of electrocardiograms with sensors with contact scanning are difficult to set a time so we decided to use the principle of non-contact sensing. Such a device to measure the ECG was constructed under the project. The disadvantage of such devices is a problem with a high level of noise, which degrades a useful signal. The aim of this article is to pre-process the signals obtained from non-contact sensing. The contactless devices are powered from the network and battery. The electrodes were connected by way of Eithoven bipolar leads. Signals were pre-treated with suitable filters so that they are also appropriate for their subsequent analysis. In the filtration ECG signals was used as a method of linear (low pass filter, high pass, IIR (Infinite Impulse Response) peak, notch filter. The results of many signals clearly demonstrate removing noise in the ECG signals to the point that is also suitable for their analysis.
Authors: Nasir S. Hassen, Nor Azwadi Che Sidik, Jamaluddin Md Sheriff
Abstract: Spray losses are the most important problem that is faced in the spray application process as result of spray drift to non target areas by the action of air flow.This paper investigated the spray drift for banding applicationusing even flat-fan nozzle TPEunder wind tunnel conditions.In addition, this paper also examined the effect of different spray fan angles 65°, 80° and 95° on spray drift particularly where there is need to make the nozzle operate at the optimum heights above the ground or plant level.In addition, three cross wind speeds 1, 2 and 3m/swere produced to determine the effect of wind speed on total spray drift.According to the results from this study, the nozzle anglehas a significant effect on the total spray drift. The nozzle angle 65° gave the highest drift reduction compared to the other nozzle angles. The maximum driftfor all nozzles was found at nozzle height of 60 cm. The minimum mean value of the drift was found at wind speed of 1 m/s. This study supports the use of nozzle angles of less than 95° on heights more than 0.5m and on wind speeds more than 1m/s as a means for minimizing spray drift.
Authors: Zi Ming Qin, Wei Zheng Yuan, Hong Long Chang, Jian Bing Xie
Abstract: . Error autocompensation using a non-MEMS micromotor is used to reduce the drift of micromachned gyroscopes. Theoretic deviation, numerical simulation and experiments are carried out. Test results show that the bias instability of micromachined gyroscopes is reduced from 542°/h to 39°/h, which makes their high end applications possible
Authors: Konrad J. Waluś
Abstract: Safe driving requires from the driver several visual-mental activities (perception, recognition and decide) and manual activities relating to the implementation of specific movements. Vehicle responding to the given force is subjected a three axial loads that are transferred through the frictional coupling of tire and pavement Generated during the movement, in particular, curvilinear, lateral drift forces act directly on the tire tread and indirectly by steering to the driver. The value of these forces depends on the angle of the lateral drift, motion parameters and surface type. The paper presents results of experimental determination of lateral forces on the drift the running machine with five-component hub.
Authors: I. Apykhtina, Boris S. Bokstein, Anatoly S. Ostrovsky, A. Petelin, Alexey Rodin, David J. Srolovitz
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