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RISS 인기검색어
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- 저자 : Hu Wenbo (검색결과 7 건)
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A Modified Expanded Clay as a Yielding Material in Deep Mechanized Tunnel Boring
Xiongyu Hu,Chuan He,Gaoyu Ma,Wenbo Yang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7
This paper investigates the use of a modified expanded clay as a yielding fill material in the overcut behind the segmental lining. In order to match the stress-strain curves of the ideal yielding material, expanded clay of different sizes and different clay mixed components were tested. Both of the field tests and numerical calculation were conducted to evaluate the behaviour of liner in deep tunnel when the modified expanded clay was backfilled. The safety of the liner was assessed. The results show that the non-modified expanded clay offers a linear behaviour up to a deformation of 25% to 40%, and with an average limit compressive strength between 1 MPa to 5 MPa. By adding a certain percentage of polystyrene to the expanded clay, the limit compressive strength and the linear deformation phase can be modified. Polystyrene reduces the stiffness and offers a yielding section in the deformation phase, which makes the expanded clay close to an ideal yielding material. Through modification of the expanded clay, the limit compressive strength can be adjusted to an approximately 55% compressive strain. The results of field tests and numerical simulation verified the use of the modified expanded clay as a yielding material in deep tunnels.
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Entire solutions of differential-difference equations of Fermat type
Pei-Chu Hu,Wenbo Wang,Linlin Wu 대한수학회 2022 대한수학회보 Vol.59 No.1
In this paper, we extend some previous works by Liu et al. on the existence of transcendental entire solutions of differential-difference equations of Fermat type. In addition, we also present a precise description of the associated entire solutions.
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Qi Jia,Gangui Yan,Wenbo Hu,Kan Liu,Junxi Wang 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1
Aiming at the sub-synchronous oscillation (SSO) problem that direct-drive permanent magnetic synchronous generator (PMSG) based wind farm under low operating conditions connects to the grid, based on the idea of graphical block modeing, the wind turbine generation (WTG), collector circuit and grid are regarded as discrete components. On the basis of establishing detailed models of each component, two linearized models of direct-drive PMSG based wind farm under different collector circuit topological structure is constructed. Wind farm impedance model is constructed based on state space equation of linearized model. The infl uences of current inner loop control parameters, grid strength, operating conditions on SSO characteristics are analysed. The diff erence between the two models in the study of SSO is compared. Finally, a time-domain simulation model of direct drive PMSG based wind farm connected to grid is built in EMTDC/PSCAD and the validity of the theoretical analysis is verifi ed.
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Multi-level detection and Warning Model for Bandwidth Consumption Attacks
Jincui Yang,Fangjiao Zhang,Wenbo Hu 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.8
Along with the development of IoT(Internet of Things) in industrial control field, more and more security issues are emerged, which cause great damage in the physical world. Under the background of IoT for industrial control, we propose a multi-level detection and warning model, the model can find the attacked node quickly and further effectively forecast data transmission situation of IoT. In addition to detecting the attacks accurately and effectively, the algorithm could give different levels of alarm according to network running situations. And then corresponding measures would be taken to guarantee network availability. An OMNeT++( Objective Modular Network Tested in C++) simulation is performed to validate correctness and practicability of the model at last. And the results verify that this model is feasible to a certain degree.
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Jia Qi,Gangui Yan,Liu Kan,Hu Wenbo,Wang Junxi 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.2
Subsynchronous oscillations (SSOs) induced during the generation of wind power constitute an important problem that aff ects the safety and the stability of power systems. It is useful to study the impact of wind turbines on the damping of the SSOs of a synchronous generator (SG). On the one hand, the relevant studies have been based mainly on eigenvalue analysis, which is insuffi cient, and on the other, an examination of the general mechanism of the SSO is still lacking. Based on the net electrical damping analysis method, this paper examines the dynamic interaction between the SG and doubly fed induction generator-based wind turbines (DFIGs). The self-stabilizing damping coeffi cient and the mutually stabilizing damping coeffi cient are proposed from the perspective of the SG, and the eff ects of diff erent numbers and current loop control parameters of the DFIGs on torsional modes of the SG are analyzed using diff erent grid structures. A time-domain simulation model of DFIGs connected to a power grid is built in EMTDC/PSCAD to verify the correctness of the theoretical analysis.
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Meng Fanchao,Wu Yuying,Li Wenbo,Hu Kaiqi,Zhao Kai,Yang Huabing,Gao Tong,Sun Yue,Liu Xiangfa 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Evolution of the heat-resistant phases and deformation behavior of α-Al matrix of four alloys have been characterized by SEM and EBSD. The strengthening mechanisms influenced by morphology and distribution of the heat-resistant phases were described. And the strain contouring of the α-Al matrix after deformation was rendered. The heat-resistant phases with block-like as reticular or semi-reticular network distribution exist in grain boundary can effectively provide elevated-temperature strength for alloys, while the strain contouring of α-Al matrix is mainly concentrated in the area with fewer intermetallic phases. It is shown that intermetallic phase evolution corresponds to extrusion treatment and the formation of eutectic Si and primary Si, highly interconnected networks of intermetallic phases exist in the alloy in which the primary Si and the eutectic Si are simultaneously present or disappeared. And only the disappearance of the primary Si and the extrusion treatment will destroy the network structure of the intermetallic phases. A reticular or semi-reticular microstructure is more capable of matching strength and plasticity and facilitating uniform deformation of the α-Al matrix. And the destruction of this microstructure is allowed to accommodate more plastic strain before failure.
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Photocatalytic oxidation of gas-phase Hg0 by carbon spheres supported visible-light-driven CuO–TiO2
Jiang Wu,Chaoen Li,Xiantuo Chen,Jing Zhang,Lili Zhao,Tianfang Huang,Tao Hu,Chong Zhang,Bu Ni,Xiao Zhou,Pankun Liang,Wenbo Zhang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
A simplified approach for the fabrication of CuO/TiO2@C is demonstrated. In this study, low cost CuO/TiO2@C photocatalysts (CSs loading 0.25–2 wt.%) were prepared, characterized and evaluated for gasphaseHg0 oxidation. The obtained CuO/TiO2@C photocatalysts were used to remove gaseous elementalmercury under UV light and LED respectively, and the optimum doping of content of CSs was determined. The results showed that the CuO/TiO2@C photocatalysts were highly efficient in oxidizing Hg0, reachingabove 64% when the CSs doping reached 0.5 wt.%. We have proposed that the probable mechanism bywhich CuO/TiO2@C photocatalysts remove gaseous elemental mercury: with CSs doping, CSs can act assensitizer and transfer electrons to the semiconductors, triggering the formation of very reactive radicalsto improve photocatalytic efficiency.
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