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Acoustic characteristics of bi-directional turbines for thermoacoustic generators

Dongdong LIU, Yanyan CHEN, Wei DAI, Ercang LUO

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 1027-1036 doi: 10.1007/s11708-020-0702-3

Abstract: Bi-directional turbines combined with rotary motors may be a feasible option for developing high powerA general expression for the acoustic characteristics of the bi-directional turbine was proposed basedThe good fit of the correlations shows that these characteristics are valid for describing the bi-directional

Keywords： thermoacoustic power generator     acoustic characteristics     bi-directional impulse turbine     energy conversion    

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A Bayesian modeling approach to bi-directional pedestrian flows in carnival events

S. Q. XIE, S. C. WONG, William H. K. LAM

Frontiers of Engineering Management 2017, Volume 4, Issue 4,   Pages 483-489 doi: 10.15302/J-FEM-2017023

Abstract: Bi-directional pedestrian flows are common at crosswalks, footpaths, and shopping areas.

Keywords： pedestrian flow model     bi-directional interactions     empirical studies     Bayesian inference    

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Technological development and engineering applications of novel steel-concrete composite structures

Jianguo NIE, Jiaji WANG, Shuangke GOU, Yaoyu ZHU, Jiansheng FAN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1,   Pages 1-14 doi: 10.1007/s11709-019-0514-x

Abstract: community, the development and proposition of novel resource-saving high-performance steel-concrete compositeThis paper summarizes the technical principles and applications of the long-span bi-directional compositeon uplift-restricted and slip-permitted (URSP) connectors, the steel plate concrete composite (SPCC)strengthen technique, and the innovative composite joints.The research results also indicate that the high-performance steel-concrete composite structures have

Keywords： high-performance composite structure     bi-directional composite     composite transfer     uplift-restricted andslip-permitted connectors     steel plate concrete composite strengthen    

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Observation of a higher JAK2 V617F homozygous mutated clone in polycythemia vera compared to essential thrombocythemia

LIU Hongxing, TONG Chunrong, CAI Peng, GU Jiangying, LIN Yuehui, TENG Wen, WANG He, ZHANG Ying, ZHU Ping

Frontiers of Medicine 2008, Volume 2, Issue 3,   Pages 309-313 doi: 10.1007/s11684-008-0059-1

Abstract: Single-tube bi-directional allele specific amplification (SB-ASA) and real-time quantitative polymerase

Keywords： specific amplification     essential thrombocythemia     Single-tube bi-directional     JAK2V617F-positive     JAK2V617F    

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A distributed EEMDN-SABiGRU model on Spark for passenger hotspot prediction

夏大文,耿建,黄瑞曦,申冰琪,胡杨,李艳涛,李华青

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 9,   Pages 1316-1331 doi: 10.1631/FITEE.2200621

Abstract: distributed ensemble empirical mode decomposition with normalization of spatial attention mechanism based bi-directionalFurthermore, the bi-directional GRU algorithm is merged to deal with the problem that GRU can obtain

Keywords： Passenger hotspot prediction     Ensemble empirical mode decomposition (EEMD)     Spatial attention mechanism     Bi-directional    

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Layout optimization of steel reinforcement in concrete structure using a truss-continuum model

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 669-685 doi: 10.1007/s11709-023-0963-0

Abstract: Based on bi-directional evolutionary structural optimization (BESO), a new approach is developed in thisFurthermore, a modified bi-directional evolutionary structural optimization (M-BESO) method is proposedand the compressive strength of concrete, the optimization sensitivity of steel in a concrete–steel composite

Keywords： bi-directional evolutionary structural optimization     steel-reinforced concrete     concrete stress     reinforcement    

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Improved directional-distance filter

JIN Lianghai, LI Dehua

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 2,   Pages 205-211 doi: 10.1007/s11465-008-0025-2

Abstract: By combining the weighting function and the traditional directional-distance filter (DDF) in a novelway, a new vector filter - the adaptive distance-weighted directional-distance filter (ADWDDF) - is presented

Keywords： information     distance-weighted directional-distance     ADWDDF     traditional DDF     spatial-distance weighting    

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Influence of the intensity and loading time of direct current electric field on the directional migration

Xiaoyu Wang,Yuxuan Gao,Haigang Shi,Na Liu,Wei Zhang,Hongbo Li

Frontiers of Medicine 2016, Volume 10, Issue 3,   Pages 286-296 doi: 10.1007/s11684-016-0456-9

Abstract:

Exogenic electric fields can effectively accelerate bone healing and remodeling through the enhanced migration of bone marrow mesenchymal stem cells (BMSCs) toward the injured area. This study aimed to determine the following: (1) the direction of rat BMSC (rBMSC) migration upon exposure to a direct current electric field (DCEF), (2) the optimal DCEF intensity and duration, and (3) the possible regulatory role of SDF-1/CXCR4 axis in rBMSC migration as induced by DCEF. Results showed that rBMSCs migrated to the positive electrode of the DCEF, and that the DCEF of 200 mV/mm for 4 h was found to be optimal in enhancing rBMSC migration. This DCEF strength and duration also upregulated the expression of osteoblastic genes, including ALP and OCN, and upregulated the expression of ALP and Runx2 proteins. Moreover, when CXCR4 was inhibited, rBMSC migration due to DCEF was partially blocked. These findings indicated that DCEF can effectively induce rBMSC migration. A DCEF of 200 mV/mm for 4 h was recommended because of its ability to promote rBMSC migration, proliferation, and osteogenic differentiation. The SDF-1/CXCR4 signaling pathway may play an important role in regulating the DCEF-induced migration of rBMSCs.

Keywords： DCEF     migration     osteogenesis differentiation     rBMSCs     SDF-1/CXCR-4    

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Study on Cumulalive Energy Effect in Directional Fracture Controlled Blasting in Rock

Luo Yong,Shen Zhaowu

Strategic Study of CAE 2006, Volume 8, Issue 6,   Pages 78-82

Abstract: to solve the problems of stone exploitation, the mechanism of crack initiation and its expansion of directionalThe directional expansion of crack is satisfactory.Model test and field test suggest that the directional fracture controlled blasting with linear cavity

Keywords： cumulative energy effect     directional fracture controlled blasting     model test     liner     fracture    

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Topology optimization of piezoelectric bi-material actuators with velocity feedback control

Mariana MORETTI, Emílio C. N. SILVA

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2,   Pages 190-200 doi: 10.1007/s11465-019-0537-y

Abstract: The bi-material and multifunctional concepts are considered for the design of a controlled piezoelectricThe bi-material piezoelectric actuator (BPEA) has its metallic host layer designed by the TOM, which

Keywords： topology optimization method     bi-material piezoactuator     active velocity feedback control     time-domain transient    

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Bi-modes alternation stepping ultrasonic motors

JIN Jiamei, ZHAO Chunsheng

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1,   Pages 101-105 doi: 10.1007/s11465-008-0018-1

Abstract: Two-phase sinusoidal signals corresponding to the two modal frequencies drive the motor bi-direction

Keywords： miss-step     bi-direction     Two-phase sinusoidal     positioning     accumulative    

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Cu-doped Bi/Bi2WO6 catalysts for efficient N2 fixation by photocatalysis

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1412-1422 doi: 10.1007/s11705-023-2312-1

Abstract: In this paper, Cu-doped Bi2WO6 was synthesized via a solvothermal method and appliedthat the synthesized photocatalyst is actually Bi/Cu-Bi2WO6 composite.of Bi2WO6.The optimized NH3 generation rates of Bi/Cu-Bi2WO6 reached 624 and 243/Bi2WO6, respectively.

Keywords： Bi2WO6     Cu doping     work function     photocatalytic N2 fixation     charge    

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Modeling the impact of uncertainty in emissions trading markets with bankable permits

Yongliang ZHANG, Bing ZHANG, Jun BI, Pan HE

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 2,   Pages 231-241 doi: 10.1007/s11783-012-0431-x

Abstract: The various forms of uncertainty that firms may face in bankable emission permit trading markets will affect firms’ decision making as well as their market performance. This research explores the effect of increased uncertainty over future input costs and output prices on the temporal distribution of emission. In a dynamic programming setting, the permit price is a convex function of stochastic prices of coal and electricity. Increased uncertainty about future market conditions increases the expected permit price and causes a risk neutral firm to reduce ex ante emissions in order to smooth out marginal abatement costs over time. Finally, safety valves, both low-side and high-side, are suggested to reduce the impact of uncertainty in bankable emission trading markets.

Keywords： uncertainty     bankable     emission trading     market performance    

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Proportional directional valve based automatic steering system for tractors Project supported

Jin-yi LIU,Jing-quan TAN,En-rong MAO,Zheng-he SONG,Zhong-xiang ZHU

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 5,   Pages 458-464 doi: 10.1631/FITEE.1500172

Abstract: The system design is composed of a 5-way-3- position proportional directional valve, two pilot-controlledcheck valves, a pressure-compensated directional valve, a pressurecompensated flow regulator valve,

Keywords： Automatic steering system     Hydraulic circuit     Proportional directional valve     Proportional-integral-derivative    

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Optimal placement of wind turbines within a wind farm considering multi-directional wind speed using

A.S.O. OGUNJUYIGBE, T.R. AYODELE, O.D. BAMGBOJE

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 240-255 doi: 10.1007/s11708-018-0514-x

Abstract: Most wind turbines within wind farms are set up to face a pre-determined wind direction. However, wind directions are intermittent in nature, leading to less electricity production capacity. This paper proposes an algorithm to solve the wind farm layout optimization problem considering multi-angular (MA) wind direction with the aim of maximizing the total power generated on wind farms and minimizing the cost of installation. A two-stage genetic algorithm (GA) equipped with complementary sampling and uniform crossover is used to evolve a MA layout that will yield optimal output regardless of the wind direction. In the first stage, the optimal wind turbine layouts for 8 different major wind directions were determined while the second stage allows each of the previously determined layouts to compete and inter-breed so as to evolve an optimal MA wind farm layout. The proposed MA wind farm layout is thereafter compared to other layouts whose turbines have focused site specific wind turbine orientation. The results reveal that the proposed wind farm layout improves wind power production capacity with minimum cost of installation compared to the layouts with site specific wind turbine layouts. This paper will find application at the planning stage of wind farm.

Keywords： optimal placement     wind turbines     wind direction     genetic algorithm     wake effect    

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Title Author Date Type Operation

Acoustic characteristics of bi-directional turbines for thermoacoustic generators

Dongdong LIU, Yanyan CHEN, Wei DAI, Ercang LUO

Journal Article

A Bayesian modeling approach to bi-directional pedestrian flows in carnival events

S. Q. XIE, S. C. WONG, William H. K. LAM

Journal Article

Technological development and engineering applications of novel steel-concrete composite structures

Jianguo NIE, Jiaji WANG, Shuangke GOU, Yaoyu ZHU, Jiansheng FAN

Journal Article

Observation of a higher JAK2 V617F homozygous mutated clone in polycythemia vera compared to essential thrombocythemia

LIU Hongxing, TONG Chunrong, CAI Peng, GU Jiangying, LIN Yuehui, TENG Wen, WANG He, ZHANG Ying, ZHU Ping

Journal Article

A distributed EEMDN-SABiGRU model on Spark for passenger hotspot prediction

夏大文,耿建,黄瑞曦,申冰琪,胡杨,李艳涛,李华青

Journal Article

Layout optimization of steel reinforcement in concrete structure using a truss-continuum model

Journal Article

Improved directional-distance filter

JIN Lianghai, LI Dehua

Journal Article

Influence of the intensity and loading time of direct current electric field on the directional migration

Xiaoyu Wang,Yuxuan Gao,Haigang Shi,Na Liu,Wei Zhang,Hongbo Li

Journal Article

Study on Cumulalive Energy Effect in Directional Fracture Controlled Blasting in Rock

Luo Yong,Shen Zhaowu

Journal Article

Topology optimization of piezoelectric bi-material actuators with velocity feedback control

Mariana MORETTI, Emílio C. N. SILVA

Journal Article

Bi-modes alternation stepping ultrasonic motors

JIN Jiamei, ZHAO Chunsheng

Journal Article

Cu-doped Bi/Bi2WO6 catalysts for efficient N2 fixation by photocatalysis

Journal Article

Modeling the impact of uncertainty in emissions trading markets with bankable permits

Yongliang ZHANG, Bing ZHANG, Jun BI, Pan HE

Journal Article

Proportional directional valve based automatic steering system for tractors Project supported

Jin-yi LIU,Jing-quan TAN,En-rong MAO,Zheng-he SONG,Zhong-xiang ZHU

Journal Article

Optimal placement of wind turbines within a wind farm considering multi-directional wind speed using

A.S.O. OGUNJUYIGBE, T.R. AYODELE, O.D. BAMGBOJE

Journal Article