Zobrazeno 1 - 10
of 1 498
pro vyhledávání: '"Resistance coefficient"'
Autor:
Mingming Lu, Qian Miao, Pengfei Zhang, Guangwei Sun, Mingyue Yang, Yao Zhao, Kai Zhang, Chong Wang, An-ran Wang, Tong-fu Zheng
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-19 (2024)
Abstract With the increase in high-rise buildings in cities, public flue exhaust systems have a direct impact on residential air quality and the living environment. Although existing studies have analyzed the problems in public flue exhaust systems t
Externí odkaz:
https://doaj.org/article/d4d41467c562444297813bd28cd305b7
Publikováno v:
علوم آب و خاک, Vol 28, Iss 2, Pp 163-176 (2024)
Surface irrigation is one of the most common irrigation methods. Due to the low efficiency of surface irrigation, water loss is significant in this system. It is necessary to know the characteristics and coefficients of water infiltration rate in the
Externí odkaz:
https://doaj.org/article/c9ebd35d2fd740eea4cb726e6400a563
Autor:
ZHAO Hong-guo1, XU Dian-hong1, CHEN Yang2, HUANG Xi-dai1, ZHOU Lei1, LI Tong3, WANG Kai4, ZHONG Qi-lin1"
Publikováno v:
Hecheng xiangjiao gongye, Vol 47, Iss 4, Pp 296-300 (2024)
The sequence structure, microstructure, molecular weight, processing performance, as well as low temperature resistance and compression permanent set of nitrile rubber (NBR) 1906 produced by Lanzhou Petrochemical Company were investiga-ted, and compa
Externí odkaz:
https://doaj.org/article/675180bd99ab42a8aa2c7c54db8efadb
Publikováno v:
Propulsion and Power Research, Vol 13, Iss 2, Pp 245-256 (2024)
Based on the demands of compact heat exchangers and micro cooling channels applied for aviation thermal protection on aero-engines, the elbow local flow resistance characteristics for supercritical pressure aviation fuel RP-3 flowing in adiabatic hor
Externí odkaz:
https://doaj.org/article/a1749ba1c9f0494393e5da7e2c258131
Publikováno v:
Journal of Engineering and Applied Science, Vol 71, Iss 1, Pp 1-18 (2024)
Abstract Most hot dry rock geothermal wells are small angle directional wells, and rock cuttings easily accumulate at the bottom of the borehole to form a cuttings bed, causing accidents such as drill sticking, reducing the rate of penetration, and d
Externí odkaz:
https://doaj.org/article/bee6f90aa9d746299dea91c9fa297db4
Publikováno v:
Case Studies in Construction Materials, Vol 20, Iss , Pp e03153- (2024)
Sulfate attack seriously affects the durability of concrete structures, and many tunnels constructed in China in the early years did not adequately take it into account, resulting in structural degradation of many currently operating tunnels within t
Externí odkaz:
https://doaj.org/article/e895c8129b1e49e4aa7eebede7272db5
Publikováno v:
IEEE Access, Vol 12, Pp 24813-24830 (2024)
The prediction of frictional air resistance using the inherent properties of roadways is of great significance for ventilation network computation and flow regulation in underground mines. This study proposes an improved stacked learning and error co
Externí odkaz:
https://doaj.org/article/c69b5738560248c3a9bd03cd898c789c
Autor:
Marek Kalenik, Marek Chalecki, Piotr Wichowski, Adam Kiczko, Krzysztof Chmielowski, Martyna Świętochowska, Joanna Gwoździej-Mazur
Publikováno v:
Journal of Water and Land Development, Iss No 59, Pp 174-182 (2024)
The paper presents the results of studies on local resistance coefficients (ζ). The study used pipe aerators with filling made according to the Polish patent PL235924. The hydraulic investigations were performed in real working conditions of a water
Externí odkaz:
https://doaj.org/article/7526b7d3483e4b0fa36f83be3b789564
Autor:
A. Nasseri
Publikováno v:
علوم آب و خاک, Vol 27, Iss 2, Pp 119-133 (2023)
The selection of precision value for Roughness coefficient (RC) is necessary to design and utilize earth canals due to the vast distribution of Echinocola crus-galli in earth canals. Therefore, the current study was conducted to evaluate roughness co
Externí odkaz:
https://doaj.org/article/4e948e46f5f84bd38d620ebe0e21a2d7
Publikováno v:
Water, Vol 16, Iss 12, p 1648 (2024)
A compound channel’s discharge capacity and boundary shear force can be predicted as a sum of the discharge capacity of different sub-regions once the apparent shear stress of the dividing line is reasonably quantified. The apparent shear stress wa
Externí odkaz:
https://doaj.org/article/277eb1d8969f4fc3a532d6ec521ffa4a