Time filter

Source Type

Beijing, China

Beijing Institute of Petrochemical Technology , founded in 1978, is used to be a specialist school attached by petrochemical system. After a highly development in decades, it is now a Multi-disciplinary university with 11 colleges and departments. Wikipedia.

Wang D.,Beijing Institute of Petrochemical Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

In order to use binocular vision for indoor mobile robot localization, a mobile robot localization system was developed, and the principles of binocular vision localization were analyzed. The experimental system was established with MicronTracker vision system and mobile robot. The distance experiment of binocular vision was given, and ranging precision was analyzed, then the worst deviation is as 8.644 mm. On the basis of above work, mobile robot localization tests show that binocular vision localization worst deviation is as 3.635 cm. The system has higher precision, stability and less affect by environment, which can meet the positioning requirements of mobile robot. Source

Gu Y.,Beijing Institute of Petrochemical Technology | Bandopadhyay S.,University of Alaska Fairbanks | Chen C.-F.,University of Alaska Fairbanks | Ning C.,South China University of Technology | Guo Y.,Tsinghua University
Materials and Design | Year: 2013

This paper addresses the long-term corrosion behavior of microarc oxidation coated Mg alloys immersed in simulated body fluid for 28days. The coatings on AZ31 Mg alloys were produced in the electrolyte of sodium phosphate (Na3PO4) at the concentration of 20g/L, 30g/L and 40g/L, respectively. Scanning electron microscope (SEM) and optical micrograph were used to observe the microstructure of the samples before and after corrosion. The composition of the MAO coating and corrosion products were determined by X-Ray Diffraction (XRD). Corrosion product identification showed that hydroxyapatite (HA) was formed on the surface of the corroded samples. The ratio of Ca/P in HA determined by the X-ray Fluorescence (XRF) technique showed that HA is an acceptable biocompatible implant material. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were employed to characterize the corrosion rate and the electrochemical impedance. The corrosion resistance of the coated Mg alloys can be enhanced by optimizing the electrolyte concentrations for fabricating samples, and is enhanced after immersing the coated samples in simulated body fluid for more than 14days. The enhanced corrosion resistance after long-term immersion is attributed to a corrosion product layer formed on the sample surface. The inhibition mechanism of the corrosion process is discussed and presented with an animation. © 2012 Elsevier Ltd. Source

Wu Q.,China University of Mining and Technology | Xu H.,Beijing Institute of Petrochemical Technology
Science China Earth Sciences | Year: 2014

The 3D geological modeling is the prerequisite and core foundation for Digital Mine. Although this new technology brings new opportunities and motivation for the mineral exploration industry, it still has many difficulties to be solved in this area. Based on the characteristics of mine data and the aim of Digital Mine construction, this paper introduces a theory including multi-source data coupling, multi-modeling methods integration, multi-resolution visualization and detection, and multidimensional data analysis and application. By analyzing problems such as the uncertainty in each step of the modeling process, we designed a novel modeling method that can be applied to the complex geological body modeling, mineral resource/reserve estimation, and the mining exploration engineering. Along with the process of mine exploration, development, and reclamation, 3D modeling undergoes the process of "construction-simulation-revision" during which the 3D model is able to be dynamically updated and gradually improved. Based on the result of practical utilization, it is proven that the methodology introduced by this paper can be used to build an effective 3D model by fully using the mining data under the control of spatial information quality evaluation. Our experiments show that such a 3D model can be used to evaluate the mine resource and provide the scientific evidence to improve mining efficiency during the various stages of evolvement process in mine. © 2013 Science China Press and Springer-Verlag Berlin Heidelberg. Source

Wang D.,Beijing Institute of Petrochemical Technology
Qinghua Daxue Xuebao/Journal of Tsinghua University | Year: 2012

An indoor mobile-robot path planning system was developed under the structured environment in consideration of the characteristics of mobile-robot technology on indoor localization. Based on the global map building methods, the environment map was built in the robot's actual environment using the grid method. The path preliminarily planned by A* algorithm contained all planning point coordinates, which caused more redundant points with the robot not being able to adjust its posture at the inflection point. An improved A* algorithm, which can calculate the inflection point, rotation direction and the minimum rotation angles, was then proposed against the shortage of the path planning. Mobile-robot positioning tests show that the improved algorithm not only simplifies the path, but also adjusts the robot's posture at the inflection point, which can meet the requirements of robot autonomous movement. Source

Zhao J.-F.,Beijing Institute of Petrochemical Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

The status quo of coal clean-using in life cycle was analyzed, the results indicate that coal conventional using mode is low efficiency; the CO2 emissions of coal-fired power generation as a share of overall carbon dioxide emissions increases from 17.2% in 1978 to 39.8% in 2006, electric power industry has become the main source of CO2 emissions, constructing low-carbon power industry system is urgently needed. Coal chemical technology analysis shows that China should scientific moderately developing coal to olefin technology; coal-to-liquids can make scientific exploration, but should be strictly restricted. Coal regulations and policy review show that coal laws lag behind, modification and perfection are needed; coal policy shortage of corresponding incentive and restraint mechanisms, lack of low carbon provisions and regulations. Finally, puts forward some policy recommendations on promoting coal clean-using under the low-carbon economy: suggestions on start-up "coal clean and low-carbon using ten years plan", constitute regional coal low-carbon economic sectors and low-carbon technical standard department, establish independent technical innovation system and mechanism of coal low-carbon field, establish low carbon technology development fund, make coal carbon tax system research and the pilot. Source

Discover hidden collaborations