Preparation of radioactively labelled condensation aerosols. III. Equipment for filter efficiency measurement by means of radioactively labelled aerosols

1971 ◽  
Vol 36 (6) ◽  
pp. 2362-2365 ◽  
Author(s):  
K. Spurný ◽  
J. Kubálek
Keyword(s):  
Efficiency Measurement ◽  
Filter Efficiency

QUANTUM EFFICIENCY MEASUREMENT IN A HIT SOLAR CELL

2019 ◽  
Vol 68 ◽  
pp. 120-125
Author(s):  
A. V. Ermachikhin ◽  
◽  
Yu. V. Vorobyov ◽  
V. O. Sazonov ◽  
◽  
...  
Keyword(s):  
Solar Cell ◽  
Quantum Efficiency ◽  
Efficiency Measurement

Electrospun polyacrylonitrile/polyvinyl pyrrolidone composite nanofibrous membranes with high-efficiency PM2.5 filter

2020 ◽  
Vol 40 (6) ◽  
pp. 487-493
Author(s):  
Chen Wang ◽  
Kun Yan ◽  
Jun Wang ◽  
Siyu Chen ◽  
Jiaming Cui ◽  
...  
Keyword(s):  
Pore Structure ◽  
Composite Nanofibers ◽  
High Efficiency ◽  
Fine Particulate Matter ◽  
Polyvinyl Pyrrolidone ◽  
Indoor Dust ◽  
Mass Ratio ◽  
Filter Efficiency ◽  
Fine Particulate ◽  
Closed Pore

AbstractIn this research, we successfully fabricated a novel closed pore polyacrylonitrile (PAN)/polyvinyl pyrrolidone (PVP) composite nanofibrous membrane (PCNM) on the substrate of a commercial polypropylene window mesh. First, smooth and uniform PAN/PVP composite nanofibers (PCNs) were manufactured by blending PAN and PVP with a mass ratio of 5:5 during electrospinning. Subsequently, the prepared PCNs were hot pressed in a vacuum drying oven at a given temperature of 90°C. The morphology and filter efficiency of PCN and PCNM were investigated. It was found that hot-pressing treatment significantly affected the pore structure and orientation of PCNM, which contributed to its closed pore structure and good alignment. The filter efficiency results indicated that the hot-pressed PCNMs have excellent removal efficiency of up to 96.8% of fine particulate matter. This research demonstrates that PCNMs have potential as filters for indoor dust removal and will provide a new idea for the development of air filters.

scholarly journals Mining Eco-Efficiency Measurement and Driving Factors Identification Based on Meta-US-SBM in Guangxi Province, China

2021 ◽  
Vol 18 (10) ◽  
pp. 5397
Author(s):  
Yonglin Li ◽  
Zhili Zuo ◽  
Deyi Xu ◽  
Yi Wei
Keyword(s):  
Economic Efficiency ◽  
Mining Industry ◽  
Resource Efficiency ◽  
Efficiency Measurement ◽  
Environmental Efficiency ◽  
External Factors ◽  
Beibu Gulf ◽  
Government Control ◽  
The Sustainable Development ◽  
Internal And External Factors

The mining industry is one of the pillar industries of Guangxi’s economic and social development. The output value of mining and related industries accounts for 27% of the whole district’s total industrial output value. Therefore, the mining eco-efficiency measurement in Guangxi can be of great significance for the sustainable development of Guangxi’s mining industry. This study adopted Meta-US-SBM to measure the mining eco-efficiency in Guangxi from 2008 to 2018, including economic efficiency, resource efficiency, and environmental efficiency. It used the standard deviation ellipse model to simulate the migration trend of four efficiencies in Guangxi and used GeoDetector and Tobit models to explore the internal and external factors that affect the mining eco-efficiency. The four efficiencies in Guangxi show large temporal and spatial heterogeneity, and the internal and external factors that affect the mining eco-efficiency are different. The following conclusions can be drawn. (1) Environmental efficiency and mining eco-efficiency are improving, while economic efficiency and resource efficiency are deteriorating. Cities bordering other provinces have a significantly better mining eco-efficiency than non-bordering cities. (2) The development center in Guangxi has migrated to the Beibu Gulf Economic Zone. (3) Natural resources index and mining economic scale have a great impact on the mining eco-efficiency, and with the increase of the mining economic scale, the mining eco-efficiency showed a typical “U-shaped” curve. Finally, this study put forward corresponding policy recommendations to improve the mining eco-efficiency in Guangxi from four aspects: opening-up, technological progress, regional coordination, and government control.

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