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Fox depth correction factor 1

N-doped carbons 1

Three Gorges Power Station 1

Zn-air battery 1

block reinforcement 1

bond strength 1

cement mortar 1

cobalt embedment 1

covalent organic framework 1

embedment 1

layout 1

multivariable 1

natural fibre 1

oxygen reduction 1

pullout test 1

regression 1

sediment and floating debris discharging 1

settlement 1

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Effect of embedment length of untreated natural fibres on the bond behaviour in cement mortar

Gudimella RAMAKRISHNA, Sriraman PRIYADHARSHINI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 454-460 doi: 10.1007/s11709-017-0454-2

Abstract: The other parameters included in the investigation are water/cement (w/c) ratio, sand gradation and embedment

Keywords： bond strength cement mortar natural fibre pullout test type of failure

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Multivariable regression model for Fox depth correction factor

Ravi Kant MITTAL, Sanket RAWAT, Piyush BANSAL

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1, Pages 103-109 doi: 10.1007/s11709-018-0474-6

Abstract: calculating the Fox depth correction factor used in computation of settlement reduction due to foundation embedmentTherefore, this paper presents a non-linear regression model for the analysis of effect of embedment

Keywords： settlement embedment Fox depth correction factor regression multivariable

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The design of Three Gorges Hydropower Station

Zhou Shuda,Xie Hongbing

Strategic Study of CAE 2011, Volume 13, Issue 7, Pages 78-84

Abstract:

Using physical model and numerical simulation techniques, some technical problems were studied systematically, including layout of power station, measures of sediment and floating debris discharging, types of intake, embedded types of spiral case, layout of underground powerhouse tunnel group and block reinforcement. It was optimal in technique and economy with the arrangement of powerhouse at the dam-toe of both banks + underground powerhouse in the right bank, as well as the intake with a single and small orifice. The sediment and debris problems could be solved with disperse sediment ejection and floating debris discharging holes. With the adoption of techniques for spiral case such as heat and pressure preservation, cushion layer and combined embedding, the stable operation of generating units can be guaranteed. The arrangement of tailrace tunnel with sloping ceiling was better than that of tailrace surge tank. The technical requirements related to the embedding type of spiral case were proposed. The reinforcement of huge unfavorable blocks was discussed and the new idea for block reinforcement using anti-sliding piles and normal compressive stress of structural plane was put forward.

Keywords： Gorges Power Station layout sediment and floating debris discharging spiral case embedding shallow embedment

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Cobalt nanoparticle decorated N-doped carbons derived from a cobalt covalent organic framework for oxygen electrochemistry

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 6, Pages 1550-1560 doi: 10.1007/s11705-021-2104-4

Abstract: The low cost and highly efficient construction of electrocatalysts has attracted significant attention owing to the use of clean and sustainable energy technologies. In this work, cobalt nanoparticle decorated N-doped carbons (Co@NC) are synthesized by the pyrolysis of a cobalt covalent organic framework under an inert atmosphere. The Co@NC demonstrates improved electrocatalytic capabilities compared to N-doped carbon without the addition of Co nanoparticles, indicating the important role of cobalt. The well-dispersed active sites (Co-N_x) and the synergistic effect between the carbon matrix and Co nanoparticles greatly enhance the electrocatalytic activity for the oxygen reduction reaction. In addition, the Co content has a significant effect on the catalytic activity. The resulting Co@NC-0.86 exhibits a superb electrocatalytic activity for the oxygen reduction reaction in an alkaline electrolyte in terms of the onset potential (0.90 V), half-wave potential (0.80 V) and the limiting current density (4.84 mA·cm^–2), and a high selectivity, as well as a strong methanol tolerance and superior durability, these results are comparable to those of the Pt/C catalyst. Furthermore, the superior bifunctional activity of Co@NC-0.86 was also confirmed in a home-built Zn-air battery, signifying the possibility for application in electrode materials and in current energy conversion and storage devices.

Keywords： cobalt embedment N-doped carbons covalent organic framework oxygen reduction Zn-air battery