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Output tracking control of mobile manipulators based on dynamical sliding-mode control

WUYuxiang, FENG Ying, HU Yueming

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 110-115 doi: 10.1007/s11465-007-0019-5

Abstract: Then, the system is decomposed into four lower-dimensional subsystems by means of diffeomorphism and

Keywords： lower-dimensional     nonlinear     trajectory     tracking     diffeomorphism    

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Simulation of flow excursion and thermal siphon under natural circulation condition with lower pressureand lower quality

WANG Jianjun, YANG Xingtuan, JIANG Shengyao

Frontiers in Energy 2008, Volume 2, Issue 2,   Pages 169-173 doi: 10.1007/s11708-008-0044-z

Abstract: The simulation of flow excursion was conducted under HRTL-5 condition. The mechanism analysis and the simulation of thermal siphon process were also performed. The result shows that the computer code can be used to simulate the static instability of a natural circulation system and the simulation of flow excursion almost conforms to the experiment result.

Keywords： HRTL-5     experiment     circulation     simulation     thermal    

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Dynamic fate modeling of γ-hexachlorocyclohexane in the lower reaches of the Liao River

LIU Zhenyu, YANG Fenglin, QUAN Xie, ZHANG Xiaohong

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 2,   Pages 166-171 doi: 10.1007/s11783-007-0029-x

Abstract: This model is used to simulate the fate of γ-hexachlorocyclohexane (γ-HCH) in the lower reaches of the

Keywords： coefficient     POPs     temperature     sediment increase     dependent    

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Does financial development lower energy intensity?

Philip Kofi ADOM, Michael Owusu APPIAH, Mawunyo Prosper AGRADI

Frontiers in Energy 2020, Volume 14, Issue 3,   Pages 620-634 doi: 10.1007/s11708-019-0619-x

Abstract: case of Ghana, this study provides an empirical answer to the question: does financial development lower

Keywords： financial development     energy intensity     energy efficiency     Ghana    

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Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0035-5

Abstract: Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Keywords： finite element power     stability rock escarpment    

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Natural ecological water demand in the lower Heihe River

FU Xinfeng, HE Hongmou, JIANG Xiaohui, WANG Guoqing, YANG Shengtian

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 1,   Pages 63-68 doi: 10.1007/s11783-008-0022-z

Abstract: The ecological environment in the lower Heihe River has been deteriorating due to large water consumptionTo restore the ecological environment in the lower Heihe River, the ecological water demand should beThe natural vegetation area in the lower Heihe River was first obtained through the interpretation ofFinally, the natural ecological water demand in the lower Heihe River under the current situation wasIn comparison, the natural ecological water demand in the lower Heihe River is 3.91–4.05 × 10 m.
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Sensor-guided gait-synchronization lower-extremity-exoskeleton for potential application on unilateral Research Articles

Donghai WANG

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6,   Pages 920-936 doi: 10.1631/FITEE.2000465

Abstract:

This paper presents a gait-synchronization system to help potential unilateral knee-injured people walk normally with a ed (LEE). This relieves the body weight loading on the knee-injured leg and synchronizes its motion with that of the healthy leg during the swing phase of walking. The gait-synchronization system is integrated with a designed to sense the motion/gait of the healthy leg. Guided by the measured joint-angle trajectories, the motorized hip joint lifts the links during walking and synchronizes the knee-injured gait with the healthy gait by a half-cycle delay. The effectiveness of the LEE is illustrated experimentally. We compare the measured joint-angle trajectories between the healthy and knee-injured legs, the simulated knee forces, and the human-exoskeleton interaction forces. The results indicate that the motorized hip-controlled LEE can synchronize the motion/gait of the combined body-ed LEE and injured leg with that of the healthy leg.

Keywords： Sensor-guided     Lower-extremity-exoskeleton     Body sensor network     Gait synchronization     Weight-support    

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Bearing and uplift capacities of under-reamed piles in soft clay underlaid by stiff clay using lower-bound

Mantu MAJUMDER, Debarghya CHAKRABORTY

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 537-551 doi: 10.1007/s11709-021-0708-x

Abstract: effectiveness of under-reamed piles in soft clay underlaid by stiff clay is numerically studied using the lower-boundThe bearing and uplift capacities of under-reamed piles are estimated through non-dimensional factors

Keywords： bearing capacity     uplift capacity     under-reamed pile     clay     limit analysis    

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Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and

Shuvankar DAS; Debarghya CHAKRABORTY

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 8,   Pages 1040-1055 doi: 10.1007/s11709-022-0841-1

Abstract: Lower bound finite element limit analysis in association with Power Cone Programming (PCP) is appliedThe change in stability due to the presence of undercut is expressed in terms of a non-dimensional stability

Keywords： undercut     vertical escarpment     stability     Hoek-Brown yield criterion     PCP    

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High cadmium pollution risk on vegetable amaranth and a selection for pollution-safe cultivars to lower

Yihui ZHOU, Meng XUE, Zhongyi YANG, Yulian GONG, Jiangang YUAN, Chunyan ZHOU, Baifei HUANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 2,   Pages 219-230 doi: 10.1007/s11783-012-0469-9

Abstract: A pot experiment was carried out by growing 29 different genotypes ( spp.) of vegetable amaranth under low- (0.12 mg·kg ) and middle- (0.40 mg·kg ) cadmium (Cd) exposure. The result showed that amaranth was vulnerable to cadmium (Cd) contamination in soil. Variations of Cd concentrations in both roots and edible parts among genotypes were significant ( <0.001) in both treatments. Cd concentrations in edible parts of the tested genotypes grown under low- and middle-Cd levels were significantly correlated ( <0.01), implying that Cd-accumulating property of amaranth is genotype-dependent. Differences in Cd chemical forms between cv. Nanxingdayemashixian (cv. Nan), a selected typical pollution-safe cultivar (Cd-PSC), and cv. Pennongjianyexian (cv. Pen), a selected typical non-Cd-PSC, under different Cd exposure conditions were compared. It was found that the alternation of Cd in F (Cd form extracted by 1 mol·L NaCl) may be a key factor in regulating Cd accumulation of different amaranth genotypes and that the protein-binding Cd is considered to be associated with Cd translocation. The results indicated that amaranth is capable of enduring high level of Cd pollution when grown as vegetable crop, and accordingly, consuming vegetable amaranth would bring high health risk. Therefore, adopting Cd-PSC strategy would help reducing the risk of Cd pollution in amaranth. In this study, cv. Nan was identified as a Cd-PSC and recommended to be applied production practice.

Keywords： Amaranth     Cadmium (Cd)     Cd accumulation     pollution-safe cultivar (PSC)     Cd chemical forms     health risk    

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Diverting Seawater to Scour the Estuary and to Regulate the Lower Yellow River

Lin Bingnan,Zhou Jianjun,Zhang Ren

Strategic Study of CAE 2000, Volume 2, Issue 4,   Pages 25-33

Abstract: from Guanli Harbor on the coast of Laizhou Bay with transversal canals and have it discharged into the Lower

Since 1972, the Lower Yellow River has experienced a dry spell and has dried up from time totaken as the effective location of the river mouth where the longitudinal equilibrium profile of the LowerThis equilibrium profile would be lower than the original one by 4～12 m, depending on the estimated values

Keywords： diverting seawater     scouring     the Lower Yellow River     above-the-ground river     water resources    

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Three-dimensional stability analysis of the dam foundation at Baise

XU Qianjun, LI Xu, CHEN Zuyu

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2,   Pages 217-221 doi: 10.1007/s11709-007-0026-y

Abstract: It is usually difficult to determine the actual safety factors of rock masses in an ordinary two-dimensionalA three-dimensional stability analysis method based on the upper-bound theorem was employed to solvethat a special overflow dam monolith can be considered to be safe in case of considering the three dimensional

Keywords： ordinary two-dimensional     randomly     monolith     three-dimensional stability     different    

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Review of human–robot coordination control for rehabilitation based on motor function evaluation

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0684-4

Abstract: As a wearable and intelligent system, a lower limb exoskeleton rehabilitation robot can provide auxiliaryrehabilitation training for patients with lower limb walking impairment/loss and address the existingThe patients’ functional disorders and clinical rehabilitation needs regarding lower limbs are analysedin detail, forming the basis for the human–robot coordination of lower limb rehabilitation robots.

Keywords： human–robot coupling     lower limb rehabilitation     exoskeleton robot     motor assessment     dynamical model    

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Development of a novel autonomous lower extremity exoskeleton robot forwalking assistance Special Feature on Intelligent Robats

Yong HE, Nan LI, Chao WANG, Lin-qing XIA, Xu YONG, Xin-yu WU

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 3,   Pages 318-329 doi: 10.1631/FITEE.1800561

Abstract:

Today, exoskeletons are widely applied to provide walking assistance for patients with lower limbIn this study, we propose a novel intelligent autonomous lower extremity exoskeleton (Auto-LEE), aiming

Keywords： Lower-limb     Exoskeleton     Self-balancing     Bipedal walking     Modular design    

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A hybrid deep learning model for robust prediction of the dimensional accuracy in precision milling of

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0688-0

Abstract: The use of artificial intelligence to process sensor data and predict the dimensional accuracy of machinedIn this study, we develop a predictive model of the dimensional accuracy for precision milling of thin-walledfeatures of a structural component—squares, slots, and holes—into various categories based on their dimensionaldata collected during the milling experiments, the proposed model proved to be capable of predicting dimensional

Keywords： precision milling     dimensional accuracy     cutting force     convolutional neural networks     coherent noise    

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Title Author Date Type Operation

Output tracking control of mobile manipulators based on dynamical sliding-mode control

WUYuxiang, FENG Ying, HU Yueming

Journal Article

Simulation of flow excursion and thermal siphon under natural circulation condition with lower pressureand lower quality

WANG Jianjun, YANG Xingtuan, JIANG Shengyao

Journal Article

Dynamic fate modeling of γ-hexachlorocyclohexane in the lower reaches of the Liao River

LIU Zhenyu, YANG Fenglin, QUAN Xie, ZHANG Xiaohong

Journal Article

Does financial development lower energy intensity?

Philip Kofi ADOM, Michael Owusu APPIAH, Mawunyo Prosper AGRADI

Journal Article

Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Journal Article

Natural ecological water demand in the lower Heihe River

FU Xinfeng, HE Hongmou, JIANG Xiaohui, WANG Guoqing, YANG Shengtian

Journal Article

Sensor-guided gait-synchronization lower-extremity-exoskeleton for potential application on unilateral

Donghai WANG

Journal Article

Bearing and uplift capacities of under-reamed piles in soft clay underlaid by stiff clay using lower-bound

Mantu MAJUMDER, Debarghya CHAKRABORTY

Journal Article

Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and

Shuvankar DAS; Debarghya CHAKRABORTY

Journal Article

High cadmium pollution risk on vegetable amaranth and a selection for pollution-safe cultivars to lower

Yihui ZHOU, Meng XUE, Zhongyi YANG, Yulian GONG, Jiangang YUAN, Chunyan ZHOU, Baifei HUANG

Journal Article

Diverting Seawater to Scour the Estuary and to Regulate the Lower Yellow River

Lin Bingnan,Zhou Jianjun,Zhang Ren

Journal Article

Three-dimensional stability analysis of the dam foundation at Baise

XU Qianjun, LI Xu, CHEN Zuyu

Journal Article

Review of human–robot coordination control for rehabilitation based on motor function evaluation

Journal Article

Development of a novel autonomous lower extremity exoskeleton robot forwalking assistance

Yong HE, Nan LI, Chao WANG, Lin-qing XIA, Xu YONG, Xin-yu WU

Journal Article

A hybrid deep learning model for robust prediction of the dimensional accuracy in precision milling of

Journal Article