Study on Field Demonstration of High Sensitivity SF6 Leakage Detection Method for Gas Insulated Switchgear

2020 ◽  
Vol 140 (5) ◽  
pp. 409-414
Author(s):  
Masaru Tatemi ◽  
Hisao Inami ◽  
Toshiaki Rokunohe ◽  
Makoto Hirose
Keyword(s):  
Detection Method ◽  
High Sensitivity ◽  
Leakage Detection ◽  
Gas Insulated Switchgear

The Leakage Detection Method of Water Supply System by Regional Model

2011 ◽  
Vol 393-395 ◽  
pp. 1018-1023
Author(s):  
Hong Li Zou
Keyword(s):  
Water Supply ◽  
Detection Method ◽  
Regional Model ◽  
Supply System ◽  
Water Supply System ◽  
The Other ◽  
Leakage Detection ◽  
Regional Network ◽  
Rational Planning ◽  
Whole Water

The losing ratio of leakage in the process of water supply is about 10%-30% in total. However, the existing water supply system has no rational planning and distribution. On the other hand, it is growing fast. It is a challenge to check the leakage in whole water supply network. This paper tries to present a solution to ensure that the regional network runs reasonably and safely, which is building a regionalization of the detected model.

scholarly journals A faster detection method for high-sensitivity cardiac troponin—POCT quantum dot fluorescence immunoassay

2019 ◽  
Vol 11 (4) ◽  
pp. 1506-1513 ◽  
Author(s):  
Peiling Zhou ◽  
Haohao Liu ◽  
Lan Gong ◽  
Bo Tang ◽  
Yabing Shi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Cardiac Troponin ◽  
Detection Method ◽  
High Sensitivity ◽  
Fluorescence Immunoassay

4462249 Tank leakage detection method

Vacuum ◽  
1985 ◽  
Vol 35 (1) ◽  
pp. 61
Author(s):  
Thomas E Adams
Keyword(s):  
Detection Method ◽  
Leakage Detection

Finite Element Simulation of Partical Discharge Acoustic Pressure Levels Distribution in Gas Insulated Switchgear

2014 ◽  
Vol 487 ◽  
pp. 447-454
Author(s):  
Peng Sheng Xie ◽  
Jun Kang ◽  
Qiu Yang Li ◽  
Jia Lin Zhu ◽  
Li Li
Keyword(s):  
Finite Element ◽  
Acoustic Pressure ◽  
Partial Discharge ◽  
Interaction Model ◽  
High Sensitivity ◽  
Ultrasonic Frequency ◽  
Element Analysis ◽  
Gas Insulated Switchgear ◽  
Element Simulation ◽  
Broadband Spectrum

In this paper, we present an acoustic-structure couple interaction model of partial discharge (PD) in Gas Insulated Switchgear, the interaction between the internal acoustic source of partial discharge and structure of GIS is simulated with the finite element analysis, and the internal and external acoustic pressure levels distribution of GIS is obtained. The results based on the frequency sweep shown that the internal acoustic pressure levels is bigger than the external acoustic pressure levels of GIS in the ultrasonic frequency spectrum,it suggests that it should use the ultrasonic sensor with a broadband spectrum response to measure partial discharge in GIS, which can obtain high sensitivity. In addition, the external sound pressure of GIS is very small, and the signal of the Ultrasonic sensors must be amplified for measurement. Meanwhile, the outside acoustic pressure of the epoxy insulator is so small that it can properly judge the adjacent GIS unit partial discharge conditions.

scholarly journals An alternative PCR assay with high sensitivity and specificity for the detection of swine toxoplasmosis based on the GRA14 gene

2021 ◽  
Author(s):  
Xi He ◽  
Derong Zhou ◽  
Yanwu Sun ◽  
Yuan Zhang ◽  
Xiaogang Zhang ◽  
...  
Keyword(s):  
Detection Method ◽  
Southern China ◽  
Acute Infection ◽  
High Sensitivity ◽  
High Specificity ◽  
Pcr Detection ◽  
Pcr Assay ◽  
Specific Primers ◽  
Specificity And Sensitivity ◽  
Pcr Method

Abstract Background Toxoplasma gondii, an intracellular apicomplexan protozoan parasite, can infect all warm-blooded animals. Infected swine are considered one of the most important sources of T. gondii infection in humans. Rapidly and effectively diagnosing T. gondii infection in swine is essential. PCR-based diagnostic tests have been fully developed, and very sensitive and specific PCR is crucial for the diagnosis of swine toxoplasmosis. Methods To established a high specificity and sensitivity PCR detection method for swine toxoplasmosis, we used T. gondii GRA14 gene as target to design specific primers and established a PCR detection method for swine toxoplasmosis. A total of 5462 blood specimens collected from pigs in 5 provinces and autonomous regions in southern China during 2016–2017 were assessed by the newly established GRA14 gene PCR method. Result Altogether, we used T. gondii GRA14 gene as target to design specific primers and established a high specificity and sensitivity PCR detection method for swine toxoplasmosis; in particular, this PCR method could detect T. gondii tachyzoite DNA in the acute infection phase. The GRA14 gene PCR assay detected a minimum of 2.35 tachyzoites of T. gondii, and it could be used for T. gondii detection in blood, tissue, semen, urine and waste feed specimens. The overall T. gondii infection rate was 18.9% (1033/5462) by the newly established GRA14 gene PCR method. According to statistical analysis among different regions, the positive rates of swine toxoplasmosis in the Shaanxi, Fujian and Guangdong areas in China from 2016 to 2017 were the highest, at 31.7% (44/139), 21.9% (86/391) and 18.8% (874/4645), respectively (χ2 = 84.2, P < 0.0001). Specimens collected in 2017 had a higher positive rate (19.1% or 886/4639) than those collected in 2016 (16.1% or 155/963) (χ2 = 4.5, P < 0.05). Specimens collected in autumn (39.4% or 187/474), spring (22.8% or 670/2940) and winter (18.2% or 129/709) also had higher positive rates than those collected in summer (3.8% or 57/1479) (χ2 = 427.7, P < 0.0001). Conclusions These results indicate that the new PCR method based on the T. gondii GRA14 gene would be useful for the diagnosis of swine toxoplasmosis and that it would facilitate the diagnosis of toxoplasmosis in clinical laboratories.

scholarly journals Detection of Melamine Based on the Fluorescence Changes of Nitrogen-Doped Carbon Dots

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Wenzhi Yin ◽  
Chaoqun Ma ◽  
Tuo Zhu ◽  
Jiao Gu ◽  
Chun Zhu ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Detection Method ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Mercury Ions ◽  
Measuring Range ◽  
Nitrogen Doped ◽  
One Step ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

In order to determine the concentration of melamine, nitrogen-doped carbon dots (NCDs) were synthesized in one step as a fluorescent probe. Uric acid and diethylenetriamine were used as carbon source and nitrogen source, respectively. The experimental results showed that the fluorescence of NCDs can be quenched by mercury ions (Hg2+). Due to the strong coordination affinity between the carbon-nitrogen heterocyclic of melamine and Hg2+, part of Hg2+ coordinated with melamine when melamine was mixed with Hg2+. Then, the fluorescence of the added NCDs was quenched by the remaining Hg2+. Therefore, the concentration of melamine could be determined. The results show that the method has high sensitivity in wide measuring range that the linear ranges are 50–400 μg/L and 800–2500 μg/L, and the R2 is 0.997 and 0.988, respectively, with the limit of detection (LOD) of 21.76 μg/L. The NCDs are easy to fabricate, and the detection method is easy to implement. In this study, a new method for melamine detection was established, and the proposed method for melamine detection can provide some insights for food safety detection.

Sign in / Sign up

Export Citation Format

Share Document