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4 results on '"Miao-Miao Qiu"'

1. Discussion on feasibility of pipeline laying in underground space from the perspective of improving sensing ability

Author

Bi-yuan SHUI, Lu-ning XUE, Yu-feng YANG, Yun-bin MA, Miao-miao QIU, and Bo-xin ZHAO

Subjects
oil & gas pipelines, sensing ability, laying in underground space, construction plan, risk, economic analysis, Oils, fats, and waxes, TP670-699, Gas industry, TP751-762
Abstract

At present, the biggest safety risk and accident source of pipeline systems can be attributed to the lack of sensing ability of buried pipelines to a large extent. For this reason, a method of laying pipelines in underground space was put forward, so that the buried pipelines could be observed, monitored and accessed directly with the present detection, monitoring and sensing technologies. The sensing ability of critical pipeline sections can be enhanced fundamentally by the full range data acquisition and intelligent monitoring technology, and further the safety level of the pipelines can be improved greatly. By referring to the laying mode of municipal rainwater and sewage pipelines and urban utility tunnels, the underground space structure of semi-prefabricated reinforced concrete U-shaped pipe culvert with cover plate was proposed, where the pipelines are installed at the bottom of the pipe culvert with the support of metal bracket or concave cement pipe holder. Meanwhile, the intelligent video monitoring, optical fiber sensing, combustible gas sensing, external detection of pipeline defects or stress and other fixed or movable sensing means should be provided in the underground space. In addition, the risk factors of pipeline laying in underground space were analyzed preliminarily, and it was conservatively estimated that the overall risk could be reduced by more than 34%. Moreover, the economy of pipeline laying in underground space was also analyzed. It is expected that the construction cost of pipeline sections laying in underground space will be increased by about 7.5% to 25%, but the pipeline operation and maintenance cost, as well as the accident loss, will be reduced by more than 30%. Therefore, it is suggested that the relevant feasibility study and engineering tests should be performed in the pipeline idustry in future.(5 Figures, 22 References)

Published
2021
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2. A ratiometric fluorescent sensor made of a terbium coordination polymer for the anthrax biomarker 2,6-dipicolinic acid with on-site detection assisted by a smartphone app

Author

Miao-Miao Qiu, Bing Liu, Ling Xu, Wei-Ni Miao, Ke-Fu Chen, and Qi-Rui Liu

Subjects
Detection limit, Chemistry, Coordination polymer, chemistry.chemical_element, Terbium, General Chemistry, Condensed Matter Physics, Dipicolinic acid, Fluorescence, chemistry.chemical_compound, Linear range, Smartphone app, General Materials Science, Selectivity, Nuclear chemistry
Abstract

2,6-Dipicolinic acid (DPA) is the biomarker of anthrax spores, whose detection is in great need. A hydrothermal reaction of 2,6-naphthalenedicarboxylic acid (H2NDBC) with Tb3+ gave out a terbium coordination polymer, [Tb(NDBC)(COO)] (Tb-NDBC). Tb-NDBC featured combined emissions related with the intraligand charge transition of NDBC2‒ and characteristic 5D4→7F5 transition of Tb3+. The influences of response time, pH, and MOF dosage on the detection performances of DPA were explored and optimized. The sensitivity test of Tb-NDBC revealed a linear response of I545/I394 = 0.00728·CDPA + 0.63237 with limit of detection (LOD) of 5.21 µM in the linear range of 0-400 µM. It also showed a high selectivity that nine amino acids did not affect its detection performances. Tb-NDBC showed high sensitivity and selectivity to DPA detection in human serum and natural lake water. The paper-based sensor of Tb-NDBC displayed visible emission color conversions at 90 μΜ, and a linear equation of G = 0.77533∙CDPA + 139.66 through recognizing the green values (G) of the paper-based sensor. A smartphone APP was programmed based on the linear equation and the returned CDPA from the APP were close to theoretical values, showing the potential in DPA on-site detection.

Published
2022

4. Single-layer differential CPW-FED UWB antenna with common-mode suppressed and band notched applications

Author

Miao-Miao Qiu, Li Zhang, Chi Zhang, Liang Lu, and Yong-Chang Jiao

Subjects
Physics, Materials science, business.industry, Coplanar waveguide, Bandwidth (signal processing), 020208 electrical & electronic engineering, Notch band, 020206 networking & telecommunications, 02 engineering and technology, Condensed Matter Physics, Band notched, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Optics, Radiator (engine cooling), 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, Common-mode signal, Electrical and Electronic Engineering, Antenna (radio), Band notch, business, Differential (mathematics), Single layer
Abstract

A single-layer differential coplanar waveguide (CPW) fed antenna is proposed for common-mode suppressed and WLAN band notched ultra-wideband (UWB) applications. The UWB nature is generated by the stepped slot radiators and a pair of differential stepped CPW feeding lines. When two ports of the antenna are fed with common-mode signals, the radiator cannot be excited and common-mode suppression is obtained. Moreover, a pair of U-shaped slits and stubs are etched on the CPW lines and stepped slots to earn a notch band characteristic. Then, to validate the presented antenna, a prototype antenna is fabricated and tested. The proposed antenna shows experimentally differential reflection coefficients −10 dB bandwidth of 122.6% (2.54–10.6 GHz). A measured band notch at 5.1–5.9 GHz for WLAN band is also obtained. Moreover, the common-mode suppression within the operating band better than 1.5 dB is achieved. All the results shows that the proposed antenna can be widely used in UWB wireless communication systems, medical imaging systems and vehicular radars.

Published
2016

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