Tian Chun-xiang

Arizona State University

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Xiuzhong Wang

Qingdao Agricultural University

Jiping He

Beijing Institute of Technology

Junhua Yuan

Zhejiang Normal University

Yanling Chen

The First Affiliated Hospital, Sun Yat-sen University

Jiping He

Ministry of Education of the People's Republic of China

Yanling Chen

Sun Yat-sen Memorial Hospital

Xiuxia Wang

Hefei National Center for Physical Sciences at Nanoscale

Wiebke Hoffmann

Simone Braeuer

University of Graz

Desheng Li

Chengdu Research Base of Giant Panda Breeding

Cooperative Institutions

Huazhong University of Science and Technology

Sun Yat-sen University

Qingdao Agricultural University

Arizona State University

Interface (United States)

Ministry of Education of the People's Republic of China

Tongji University

University of Graz

University of Chinese Academy of Sciences

Sun Yat-sen Memorial Hospital

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Arsenic in the urine of two Giant Pandas and their food

Arsenic in the environment. Proceedings (2016)

Simone Braeuer Walter Goessler Wiebke Hoffmann Eveline Dungl Tian Chun-xiang

PANDAS

10.1201/b20466-155

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Simulation study of human posture control under external perturbation

Tian Chun-xiang Jiping He

A 4-segment human mechanical model with sensory and actuator dynamics has been developed to investigate the human postural control under external perturbations. The model contains the major nonlinear dynamics of the physiological system and the time delays in the sensory feedback pathways. A Smith predictor is implemented to compensate for the sensory delays. Then a linear quadratic regulator is designed to simulate the human control of postural stability. The model simulates the control of an upright posture under an external perturbation which is a short duration pulling force applied at the pelvic level. The model simulation produced controls and perturbation responses that reasonably matched experimental data. In both the human experiment and the model simulation we find that the knowledge of the perturbation is important for improved performance. We also find that the formulation of an effective controller relies heavily on the availability of sensory information from the foot such as the center of pressure. The possible application of this model in functional neural stimulation is discussed.

10.1109/cdc.1997.657699

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Adaptive postural control for a repeated perturbation

Jiping He Tian Chun-xiang

A postural perturbation paradigm was developed to study the adaptation of neural control strategy for a repeated perturbation to the upright standing. The perturbation was an impulse-like pulling force at the pelvis level. A warning signal was given to the subject before the perturbation. The performance improved quickly after a few trials. All subjects could restore the standing posture using ankle strategy for the same level of perturbation that induced stepping in the beginning. The adaptation was a slight swing in the opposite direction of the perturbation. The magnitude of EMG activities in response to the perturbation reduced after adaptation. It is suggested that a feedforward control adjustment in terms of changes in the initial condition was introduced to reduce the impact of the perturbation to the body balance. This feedforward control strategy was immediately abolished after the change of perturbation. The performance deteriorated as a consequence.

Feed forward

10.1109/iembs.1996.646503

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Citations (2)

Simultaneous Determination of Dopamine and Ascorbic Acid at a Poly(Toluidine Blue) Modified Electrode

Analytical Sciences (2004)

Yanling Chen Junhua Yuan Xiuzhong Wang Tian Chun-xiang

Toluidine

10.2116/analsci.20.1725

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Citations (16)

Monitoring Insertion Force and Electrode Impedance during Implantation of Microwire Electrodes

Tian Chun-xiang Jiping He

the electrical impedance and the insertion force were monitored during the implantation of the microwire electrodes. The data reveals distinct phases in the force and impedance profiles corresponding to the different mediums the electrodes pass through. The impedance is shown to be linearly related to the pressure exerted by the electrode on the dura (p < 0.05, R ² >0.8). While both insertion force and the impedance could be used to determine when the electrode touches and breaks through the brain surface, the later, especially the phase angle of the impedance, is shown to be more consistent and sensitive. It is proposed that the electrode impedance be used to provide more objective and accurate estimation of 1) when the electrode touches the brain; 2) the load distribution among the wires of the microwire array, and 3) the mechanical and immunological interactions between the electrode and the tissue in-vivo. The method can potentially improve the accuracy of electrode placement, and enable the development of better surgical procedures and apparatus. The principle could also be applied to other situations, such as endoscopic and minimum invasive surgeries.

Electrode array

Phase angle (astronomy)

Focused Impedance Measurement

10.1109/iembs.2005.1616205

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Citations (11)

Flow-Injection Analysis and Voltammetric Detection of NADH with a Poly-Toluidine Blue Modified Electrode

Analytical Sciences (2004)

Yanling Chen Junhua Yuan Tian Chun-xiang Xiuzhong Wang

Overpotential

Flow injection analysis

Glassy carbon

Chemically modified electrode

Linear range

10.2116/analsci.20.507

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Citations (16)

Determination of Active Arsenic Species in Soil Sediments Using a Modified Electrode

Rock and Mineral Analysis (2004)

Xiuzhong Wang Yanling Chen Xiuxia Wang Tian Chun-xiang Yanxin Wang

A method for the determination of active species and total content of arsenic by differential pulse anodic stripping voltammetry (DPASV) with gold film modified electrode is reported in this paper. All factors that influence the electrode performances have been discussed. Under the optimum condition, the stripping peak current is linear with arsenic concentration in a range of 0.01～1.00 μg/L(r=0.998 6).The detection limit is (3.0) ng/g for arsenic. The analytical results of arsenic by this method are in agreement with those analyzed by atomic fluorescence spectrometry. The method has been successfully applied to the determination of active species and total content of arsenic in soil sediments collected from Datong Basin of Shanxi province. The results show that integration of various active species equals to the total content of arsenic and further prove the reliability of the method.

Anodic Stripping Voltammetry

Stripping (fiber)

Source

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Determination of Copper in Soil Sediments Using a CNT Modified Glassy Carbon Electrode

Xiuzhong Wang Tian Chun-xiang

This paper described a method for the determination of copper in the sediment with carbon nanotube modified glassy carbon electrode by differential pulse stripping voltammetry (DPSV). The experimental results showed that deposition potential -0.6 V and deposition time 240 s in HCl medium were optimum experimental conditions. During the following electropositive scan procedure, copper was enriched on the surface of the electrode and then stripped at -0.25 V approximately. The stripping peak current was linear with copper concentration in range of 8.0×10~(-7)～1.2×10~(-5) mol/L. The detection limit was 2×10~(-7)mol/L.

Stripping (fiber)

Anodic Stripping Voltammetry

Deposition

Carbon fibers

Glassy carbon

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A statistical smoothness measure to eliminate outliers in motion trajectory tracking

Human Movement Science (1998)

Jiping He Tian Chun-xiang

Smoothness

Tracking (education)

Interpolation

10.1016/s0167-9457(97)00029-8

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Citations (10)