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Lanzhou, China

Wang S.,Lan Zhou University | Dong X.,Xinjiang Institute of Water Conservancy | Wu R.,Xinjiang University
IAHS-AISH Publication | Year: 2011

A three-dimensional finite-difference groundwater flow and salt transport model was implemented to investigate a variety of hydrogeological conditions and to simulate the behaviour of the flow system and salt transport under different scenarios in the Yanqi basin and to estimate the amount of pumped groundwater needed to evaluate the impact of different scenarios of varying extraction on the fluctuations of water levels. The models provide insight into the status and evolution of the groundwater and salt. The results of the study are useful to predict the sustainability of the groundwater resources in the Yanqi basin and to evaluate possible management actions. Copyright © 2011 IAHS Press.

Xu F.,Lan Zhou University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

A continuous time model is proposed in this paper, dealing with the decentralized decision-making of multi-products promotion, under the condition of moral hazard. The main result is that when the revenue function and the movement law satisfy certain conditions, the optimal efforts level of the division in continuous time is the same with that in the static case, even though both are distorted compared with the optimal efforts level under complete information. © 2013 SPIE.

Xu L.,State University of New York at Buffalo | Tian Y.,Lan Zhou University | Jin X.,State University of New York at Buffalo | Chen J.,Tianjin Vocational Institute | And 3 more authors.
Proceedings - International Symposium on Biomedical Imaging | Year: 2012

A novel and efficient method to simulate the behavior of guidewires in the vascular system is proposed in this paper. The graph-theoretical method is based on the principle of minimal total potential energy. We formulate the total potential energy in the vascular interventional system as the summation of the elastic energy of the guidewire and the energy due to the deformation of the vessel wall. A graph is constructed with low complexity ensuring the efficiency of the single source shortest path. Compared to previous results, experiments in three phantoms have been conducted to evaluate the performance of the proposed method and the results demonstrate that our method can achieve 20% improvement with faster running time. © 2012 IEEE.

Majoe D.,ETH Zurich | Gutknecht J.,ETH Zurich | Peng H.,Lan Zhou University
HEALTHINF 2012 - Proceedings of the International Conference on Health Informatics | Year: 2012

The EEG recording of a person has been considered as one potential component within an overall wearable sensor system that predicts the onset of mental health problems. Such a smart EEG sensor should provide detailed sensory information, be easy to use, and to put on and take off and whilst being very ergonomic the design should aim at a very low final end user cost to ensure the widest possible take up by the e-Health community. The work reported here describes the design of such a sensor, the performance and its use during extensive clinical trials aimed to establish the rules that link physiology sensing to mental health prediction.

Peng J.,Changan University | Fan Z.,Changan University | Wu D.,Changan University | Zhuang J.,Changan University | And 3 more authors.
Engineering Geology | Year: 2014

Continuous and heavy precipitation triggered a large loess landslide at the southern Dagou Village of Mapaoquan Town, Tianshui City, Gansu Province of China on July 21, 2013. The landslide debris rapidly turned into a debris flow that was deposited in the ravine mouth with the volume of 1.9×105 m3. Detailed field mapping, three-dimensional laser scanning, aerial photograph interpretation, and laboratory tests were carried out to study the formation and moving characteristics of the landslide and subsequent debris flow. The results showed that: 1) The peak flow velocity and peak discharge of the debris flow were estimated to be approximately 7.2m/s and 730m3/s, respectively. The velocity had a tendency to first increase and then decrease from the head to entrance in the Dagou gully. 2) The analysis of rainfall conditions showed that the effective antecedent rainfall within 7days and hourly rainfall intensity which triggered the slide-debris flows was 239mm and 20mm/h, respectively. Compared with the critical rainfall in this area, the effective antecedent rainfall was found to be more significant in triggering this event. 3) The mean and effective particle sizes were approximately 0.73-1.3mm and 0.036-0.087mm, respectively, and had the same distribution along the gully as the velocity, which confirmed the process of the variation in the flow velocity. 4) The scale amplification was very obvious in the formation and moving process of the slide-debris flows. © 2014.

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