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To investigate endogenous interference factors of the detection results of novel severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) IgM/IgG. Enzyme‐linked immunosorbent assay (ELISA) was used to detect SARS‐CoV‐2 IgM/IgG in sera of 200 patients without COVID‐19 infection, including rheumatoid factor (RF) positive group, antinuclear antibody (ANA) positive group, pregnant women group, and...
It is of great importance and interests for network operators to evaluate the impact of inter-cell co-channel interference on the achievable data rate in cellular networks. In this paper, a closed-form maximum achievable rate over Nakagami-m fading uplink channels based on multicell linear Wyner model is derived. Moreover, the maximum achievable rates in some special cases are investigated. Numerical...
Spreading fast and being difficult to control and put out, train fire hazard can bring property loss, threat passenger's lives. Therefore, the fire protection on train is very important. Being one of the very important factors of early fire warning, the research on smoke detection at smoldering combustion stage of train fire hazard and the interference factors can provide references for the train...
The stator flux observer is a key part in the method of Direct Torque Control (DTC). However, the accuracy of the stator flux estimation directly affected the performance of DTC. The traditional induction motor stator flux observation method have been analyzed in This paper. And for the Shortcomings of existing methods, a on-line identification methods based on Radial Basis Function(RBF) have been...
In order to obtain random vibration signals of structure accurately, it is necessary to the collected vibration signals which are processed to remove the interference factors and noise components. In this paper, three methods to noise reduction are introduced, which are the wavelet method, IIR numeric filter, and singular entropy technique separately. Construct analog signal with varying degrees of...
In signal testing procedure, due to the various interference, experimental data records collected by test system always deviate from original true data. The interference factors do not only contain measurement errors but also contain ambiguity of measuring concepts. Mixed data makes contiguous sample values be mixed up and also makes data curves vibrate strongly, which will produce unexpected sharp...
Most methods of the tradition character reorganization are based on JPEG and the classifier and then matching with the templates. Due to the environmental of plate with large noise plate and interference factors, the accuracy of this method is relatively low. In this paper, based on the analysis of the traditional method of the character recognition, it uses wavelet processing for image pre-processing,...
According to the characteristics of force-frequency character of quartz crystal and a kind of structure of mono-base multi-electrode quartz resonator, a new signal processing scheme is presented. Base frequency signals are firstly outputted when different places resonator is vibrated synchronously, and then are sent to mixer, after difference frequency signals are obtained, signals are sent to mixer...
A HVDC test line that functions as a prototype variation was constructed in Korea, after considering the main functions and characteristics of diverse ??500 kV DC transmission test line towers and the results of the analysis of the line's insulation, environment, fitting, transmission equipment, economic feasibility, and operational efficiency. The variable prototype test line has advantages in line-related...
Wireless transmission module PTR6000M based on nRF24L01 module constitutes the wireless network with multi-way data synchronization testing in the rugged electromagnetic environment of the armored vehicles characteristic parameter testing. This program is successfully used in real vehicle testing, providing a reliable information source for running armored vehicles monitoring, security and optimal...
Based on the good localization characteristic of the wavelet transform both in time and frequency domain, a de-noising method based on wavelet transform is presented, which can make happen the extraction of visual evoked potentials in single training sample from the EEG background noise in favor of studying the changes between the single sample response. The information is probably related with the...
Based on the good localization characteristic of the wavelet transform both in time and frequency domain, a de-noising method based on wavelet transform is presented, which can make happen the extraction of visual evoked potentials in single training sample from the EEG background noise in favor of studying the changes between the single sample response. The information is probably related with the...
According to the system requirements, vehicle detection system based on double induction loops has been designed. Control unit of traffic detection system designed with the core of LPC2138 has been described in detail. And the function of each hardware module has been analyzed. For bad experiment environment and various interference factors, anti-interference measures have been considered and introduced...
Some methods of enhancing oil-gas pipeline magnetic flux leakage (MFL) detection technique are introduced in the paper. Some man-made defects or imperfections on the pipe surface are detected via the axial magnetization inspection vehicle along the pipeline. The magnetic dipole model of corrosion defect is stated and the important interference factors on magnetic flux leakage are analyzed. Finite...
In this paper, we analyze the performance of IEEE 802.11b WLAN communication between access point (AP) and mobile equipment (ME) in 2.4 GHz band with noise and interference factors. WLAN communication at in-vehicle environment is assumed as the communication between electric control units (ECUs) of vehicle and central body controller in telematics field for implementing wireless vehicle control system...
Die Ergebnisse labormedizinischer Untersuchungen spielen eine herausragende Rolle bei der Diagnostik, Therapieentscheidung und -berwachung von Erkrankungen. Eine hohe Validitt der Befunde ist wesentliche Voraussetzung fr eine effiziente klinische Medizin. Whrend die Qualitt der Analytik durch die Richtlinie der Bundesrztekammer definiert ist, fehlen solche Standards fr die pr- und postanalytische...
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