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Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 503-521 doi: 10.1007/s11709-023-0927-4

Abstract: This paper presents a novel approach for simulating the localized leakage behavior of segmentally linedThe proposed approach not only simulates localized leakage at the lining segment, but also captures theLocalized leakage leads to reduced local ground pressure, which further induces outward deformation nearA localized stress arch spanning across the leakage point is observed, which manifests as the rotationThe seepage field depends on both the number and location of the leakage zones.

Keywords： segmentally lined tunnel     localized leakage     cohesive element     hydraulic behavior     numerical modeling    

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Numerical and experimental analyses of methane leakage in shield tunnel

Frontiers of Structural and Civil Engineering   Pages 1011-1020 doi: 10.1007/s11709-023-0956-z

Abstract: Tunnels constructed in gas-bearing strata are affected by the potential leakage of harmful gases, suchmethane emission was diluted, and the methane accumulation was only observed in the area near the methane leakageIn addition, laboratory tests on methane leakage through segment joints were performed.The results show that the leakage process can be divided into “rapid leakage” and “slight leakage”, dependingon the leakage pressure and the state of joint deformation.

Keywords： shield tunnel     harmful gas leakage     numerical analysis     laboratory test    

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Localized high-concentration electrolytes for lithium metal batteries: progress and prospect

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1354-1371 doi: 10.1007/s11705-022-2286-4

Abstract: Here, we provide an overview of the recent developments of localized high-concentration electrolytesFirstly, the solvation structures and physicochemical properties of localized high-concentration electrolytesThen, the developments of localized high-concentration electrolytes to suppress the formation of dendriticLastly, the remaining challenges and further possible research directions for localized high-concentration

Keywords： high-concentration electrolyte     localized high-concentration electrolyte     lithium metal battery     solid    

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Effects of leakage and friction on the miniaturization of a Wankel compressor

Yilin ZHANG, Wen WANG

Frontiers in Energy 2011, Volume 5, Issue 1,   Pages 83-92 doi: 10.1007/s11708-010-0125-7

Abstract: The discussion is related to the effect of leakage and friction on the design limit (cooling capacityIn the simulation, the main leakage comes from the gaps between the rotor and the endplates as well asThe decreasing cooling capacity of the meso Wankel compressor increases the proportion of leakage to

Keywords： meso-scale     Wankel compressor     leakage     friction    

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A rare chronic constrictive pericarditis with localized adherent visceral pericardium and normal parietal

Qingqiang Ni,Lin Yun,Rui Xu,Guohua Li,Yucai Yao,Jiamin Li

Frontiers of Medicine 2016, Volume 10, Issue 3,   Pages 356-359 doi: 10.1007/s11684-016-0467-6

Abstract: In this report, we describe a rare case of idiopathic localized constrictive visceral pericardium with

Keywords： constrictive pericarditis     heart failure     pericardiectomy    

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Long-term settlement behavior of ground around shield tunnel due to leakage of water in soft deposit

Huaina WU, Yeshuang XU, Shui-long SHEN, Jin-chun CHAI

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2,   Pages 194-198 doi: 10.1007/s11709-011-0105-y

Abstract: This paper aims to analyze the impact of the leakage of groundwater through segments on the long-term

Keywords： lining deficit     leakage of water     shield tunnel     settlement     soft deposit    

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A building unit decomposition model for energy leakage by infrared thermography image analysis

Yan SU, Fangjun HONG, Lianjie SHU

Frontiers in Energy 2020, Volume 14, Issue 4,   Pages 901-921 doi: 10.1007/s11708-020-0679-y

Abstract: A quantitative energy leakage model was developed based on the thermography image data measured for bothThe uncertainties of the predicted total building energy leakage are about 14.7%, 12.8%, 12.4%, and 15.8%The typical daily thermal energy leakage value in winter is the highest among the four seasons.The present decomposition model for energy leakage is expected to provide a practical tool for quantitativeanalysis of energy leakage of buildings.

Keywords： heat conductivity     heat coefficient     heat &fllig     ux     infrared thermography     thermal image    

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Aggravation of membrane fouling and methane leakage by a three-phase separator in an external anaerobic

Chao Pang, Chunhua He, Zhenhu Hu, Shoujun Yuan, Wei Wang

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 4, doi: 10.1007/s11783-019-1131-6

Abstract: itemcontent>

The existence of three-phase separator aggravated methane leakage

Keywords： Anaerobic membrane bioreactor     Three-phase separator     Membrane fouling     Methane leakage     Sludge property    

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Thermal response of steel framing members in open car park fires

Xia YAN; Marion CHARLIER; Thomas GERNAY

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 9,   Pages 1071-1088 doi: 10.1007/s11709-022-0879-0

Abstract: For open car park structures, adopting a performance-based structural fire design is often justified and allowed because the fire does not reach flashover. However, this design approach requires an accurate assessment of temperatures in structural members exposed to car fires. This paper describes a numerical study on the thermal exposure on steel framing members in open car park fires. Steel temperatures are computed by the coupling of computational fluid dynamics and finite element modeling, and by analytical models from the Eurocodes. In addition, the influence of galvanization on the steel temperature evolution is assessed. Results show that temperatures in unprotected beams and columns are influenced by the section geometry, car fire scenario, modeling approach, and use of galvanization. Galvanization slightly delays and reduces peak temperature. Regarding the different models, CFD-FEM (CFD: computational fluid dynamics, FEM: finite-element method) coupled models predict lower temperatures than the Hasemi model, because the latter conservatively assumes that the fire flame continuously touches the ceiling. Further, the Hasemi model cannot account for the effect of reduced emissivity from galvanization on the absorbed heat flux. Detailed temperature distributions obtained in the steel members can be used to complete efficient structural fire designs based on the member sections, structure layout, and use of galvanization.

Keywords： open car park     localized fire     steel frame     numerical modeling     computational fluid dynamics    

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Dynamic power-gating for leakage power reduction in FPGAs Research Article

Hadi JAHANIRAD,h.jahanirad@uok.ac.ir

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 4,   Pages 582-598 doi: 10.1631/FITEE.2200084

Abstract: The proposed low-leakage FPGA architecture is compared with state-of-the-art architectures by implementingMoreover, the total power consumption (leakage+dynamic power consumption) is reduced by more than 15%

Keywords： Field programmable gate array (FPGA)     Leakage power     Power-gating     Transistor-level circuit design    

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Leakage location system for oil pipeline on basis of stress wave detection

WANG Bangfeng, CHEN Renwen

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 3,   Pages 307-312 doi: 10.1007/s11465-008-0047-9

Abstract: accuracy ratio for the holing alarm is more than 90%, and the time that the system takes to respond to the leakage
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Automatic Visual Leakage Detection and Localization from Pipelines in Chemical Process Plants Using Machine Reiew

Mina Fahimipirehgalin, Emanuel Trunzer, Matthias Odenweller, Birgit Vogel-Heuser

Engineering 2021, Volume 7, Issue 6,   Pages 758-776 doi: 10.1016/j.eng.2020.08.026

Abstract:

Liquid leakage from pipelines is a critical issue in large-scale process plants.Recently, the use of infrared (IR) cameras was found to be a promising approach for leakage detectionThe k-nearest neighbor algorithm is used to classify the blocks as normal (without leakage)or anomalous (with leakage).The proposed method has high accuracy and a reasonable detection time for leakage detection.

Keywords： Leakage detection and localization     Image analysis     Image pre-processing     Principle component analysis    

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Modeling and analysis of magnetic dipoles in weak magnetic field

WANG Zhaoxia, ZHANG Weimin, LIU Hongguang

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 2,   Pages 222-225 doi: 10.1007/s11465-008-0028-z

Abstract: The magnetic leakage field distribution resulting from linear defects of a tube sample in the geomagnetic

Keywords： geomagnetic     theory     important criterion     magnetic leakage     normal component    

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Overall design and realization of selectivity leakage protection device in mines

Sun Yukun,Zhu Zhiying,Huang Zhenyue,Tang Ping

Strategic Study of CAE 2012, Volume 14, Issue 7,   Pages 93-97

Abstract:

A novel selective leakage protective device in master-slave structurethe principle of additional DC power supply in main feeding switch to examine the occurrence of the leakageIt could improve the action capability and anti-interference capability of the leakage protective device

Keywords： leakage protection     selectivity     dsPIC30F4012     PIC16F877A     RS-485 bus     optical fiber communication    

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Simulation Study on the Contact Scouring Development Between Underground Layers

Chen Jiansheng,Liu Jiangang,Jiao Yuehong

Strategic Study of CAE 2003, Volume 5, Issue 7,   Pages 33-39

Abstract: It will develope rapidly in the direction perpendicular to tho bank, and even forms a concentrate leakage

Keywords： contact scouring     starting speed     flow net     concentrate leakage passage    

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Title Author Date Type Operation

Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

Journal Article

Numerical and experimental analyses of methane leakage in shield tunnel

Journal Article

Localized high-concentration electrolytes for lithium metal batteries: progress and prospect

Journal Article

Effects of leakage and friction on the miniaturization of a Wankel compressor

Yilin ZHANG, Wen WANG

Journal Article

A rare chronic constrictive pericarditis with localized adherent visceral pericardium and normal parietal

Qingqiang Ni,Lin Yun,Rui Xu,Guohua Li,Yucai Yao,Jiamin Li

Journal Article

Long-term settlement behavior of ground around shield tunnel due to leakage of water in soft deposit

Huaina WU, Yeshuang XU, Shui-long SHEN, Jin-chun CHAI

Journal Article

A building unit decomposition model for energy leakage by infrared thermography image analysis

Yan SU, Fangjun HONG, Lianjie SHU

Journal Article

Aggravation of membrane fouling and methane leakage by a three-phase separator in an external anaerobic

Chao Pang, Chunhua He, Zhenhu Hu, Shoujun Yuan, Wei Wang

Journal Article

Thermal response of steel framing members in open car park fires

Xia YAN; Marion CHARLIER; Thomas GERNAY

Journal Article

Dynamic power-gating for leakage power reduction in FPGAs

Hadi JAHANIRAD,h.jahanirad@uok.ac.ir

Journal Article

Leakage location system for oil pipeline on basis of stress wave detection

WANG Bangfeng, CHEN Renwen

Journal Article

Automatic Visual Leakage Detection and Localization from Pipelines in Chemical Process Plants Using Machine

Mina Fahimipirehgalin, Emanuel Trunzer, Matthias Odenweller, Birgit Vogel-Heuser

Journal Article

Modeling and analysis of magnetic dipoles in weak magnetic field

WANG Zhaoxia, ZHANG Weimin, LIU Hongguang

Journal Article

Overall design and realization of selectivity leakage protection device in mines

Sun Yukun,Zhu Zhiying,Huang Zhenyue,Tang Ping

Journal Article

Simulation Study on the Contact Scouring Development Between Underground Layers

Chen Jiansheng,Liu Jiangang,Jiao Yuehong

Journal Article