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Start Over Author "Yin Fang" Journal advanced materials research
95 results on '"Yin Fang"'

1. Fuzzy Comprehensive Evaluation of Trading Regulatory Risk for a Unified and Interconnected Electricity Market in China

Author

Chun Cheng Gao, Yong Dai, Zhi Qiang Zhao, Yin Fang, and Shu Hong Shi

Subjects
Actuarial science, Index (economics), Risk analysis (engineering), Computer science, Fuzzy set, General Engineering, Electricity market, Analytic hierarchy process, Systematic trading, China, Fuzzy logic, Risk regulation
Abstract

Trading regulatory risk arises prominently in the preliminary formulation of a unified and interconnected electricity market in China. Risk indices, evaluation models and methods as well as index weights are three important aspects of a comprehensive trading regulatory risk evaluation. In this paper, firstly, on the basis of the current electricity market environment in China, systematic trading regulatory risk indices used to quantify the risk level of the unified and interconnected electricity market are established. Secondly, evaluation models and a evaluation method of the trading regulatory risk are developed on the basis of synthesis of fuzzy inference and analytic hierarchy process (AHP). The fuzzy set approach is employed to identify the membership degree of each index to various risk levels, while the AHP is used to acquire the weights of the proposed trading regulatory risk indices. Finally, a simulation based case study on the trading regulatory risk evaluation is presented to illustrate the effectiveness of the proposed indices and the evaluation method.

Published
2014
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2. Study on the Statics Analysis of Promoting the Drilling Efficiency of PDC Anchor Bit

Author

Yi Lin Mao, Yan Li, and Yin Fang Song

Subjects
Engineering, Petroleum engineering, Homogeneous, business.industry, General Engineering, Drilling, Geotechnical engineering, Penetration rate, business, Statics
Abstract

PDC anchor bit has the very good rock fragmentation abilities with high penetration rate and long drilling time,which makes the drilling efficiency highly improved and the economic benefit remarkably increased.Now PDC anchor bit has been widely used in drilling field.But for the reason that it is sensitive to the formation characteristics and working conditions,it doesn’t achieve good performance in homogeneous formations such as conglomerate and interbeded sections.In order to reach the goal of enlarging the scope of PDC anchor bit application in oilfields,it is necessary to study the breakage mechanism in conglomerate formations and design the PDC anchor bit optimally.

Published
2014
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3. An Algorithm of Adaptive Variable Spacing for Arc Fitting Non-Circular Curve

Author

Bo Guo, Shi Yin Fang, and Ying Hui Pan

Subjects
Arc (geometry), Data point, General Engineering, Curve fitting, Numerical control, Node (circuits), Function (mathematics), Curvature, Algorithm, Mathematics, Interpolation
Abstract

The Numerical Control (NC) systems are only linear and circular interpolation function, and the non-circular curve must be fitted with them before processed. There are many algorithms of fitting curve with arc, but most of them have some shortcomings, such as the numbers of fitting data points and arcs segments are too many, the error controlling are difficult in arc fitting , the programming are difficult to meet the real-time NC processing requirement and so on. This paper proposed a new algorithm, which could quickly and automatically determine the best node for fitting curve with arc according to the change of curvature and the machining error. It could ensure the machining precision and efficiency. The algorithm could be directly completed programming and processing by the NCs macro program function without any other auxiliary software. The detailed algorithm process and the application programming were given.

Published
2013
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4. Stress Analysis on a Weld Seam between Spiral Case and Penstock

Author

Ya Wei Zhao, Xin Li Bai, and Yin Fang Zhang

Subjects
Stress (mechanics), Engineering, Deformation (mechanics), business.industry, Residual stress, General Engineering, Cylinder stress, Structural engineering, business, Penstock, Finite element method, Strain gauge, Spiral
Abstract

Prototype observation and finite element analysis were carried out on a weld seam between a spiral case and a penstock of #6 generator in a certain power plant. According to the observation data and finite element calculated results, deformation and stress were analyzed for the weld seam in continuous operating stage (power generation, EL. 206.00). The results show that in the normal operation power generation stage, the strengths of the penstock, the spiral case and the weld seam are all satisfied; Even if the inlet water level reaches to EL. 275.00, the three parts are all safe (when the residual stress isn’t considered, the stress is far lower than the strength allowed values). However, the stress at point E is obviously higher, it is necessary to make further testing inspection. Finally the following suggestions are given: (1) the strain gauges should be arranged both circumferentially and axially, this is because the circumferential stress of weld seam is greater than axial stress; (2) the stiffener rings should be moved left by 50mm, thus the axial stress can be minimized and the circumferential stress can also be reduced.

Published
2012
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5. Research on Water Quality and Environmental Protection Based on Environmental Materials and Economic Change Impacts in Guanzhong Area of Weihe River in Recent Three Decades

Author

Ya Juan Zhang, Jing Qiu, Shan Shan Niu, and Yin Fang Zhou

Subjects
Pollution, Environmental protection, media_common.quotation_subject, General Engineering, Environmental science, Environmental pollution, Water quality, River water, Material technology, Permanganate index, media_common, Economic change, Ammonia nitrogen
Abstract

Economic development of guanzhong area has produced a series of impact on Weihe River’s water quality, that deteriorated seriously. Environmental pollution indicators conclude ammonia nitrogen, permanganate index, COD. Weihe River water quality was improved significantly through the adjustment of industrial structure, increased investment in environmental protection and policy made to protect the Waihe River. Environmental materials is very beneficial to environment.In recent years, the new environmental material technology what can be promoted in Guanzhong region, which is carrying out the zero-emission technology in heavily-polluted paper industry, it can solve the pollution problems from the source, and it play a significant role in improving the water quality of Weihe River.

Published
2012
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6. A Distributed Phase Time Optimization Method of the Coordinated Control for Active Bus Signal Priority

Author

Feng Li and Sai Yin Fang

Subjects
Bus network, Priority inheritance, Flow (mathematics), Intersection (set theory), Computer science, Real-time computing, General Engineering, Local bus, Traffic flow, Signal, Control bus
Abstract

Active bus signal priority controlling method at a single intersection bases on single bus flow priority, applying for coordinated control in many intersections .This paper comprehensively considered green wave of general traffic and bus traffic in every decision project, made the priority signal distributed phase time parameter, based on green wave band width of general traffic flow, general flow delay and bus flow delay, made a comprehensive benefit preferred model ,made the best decision, verified the controlling algorithm.

Published
2012
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7. Research on Abnormal Car-Following Behavior of Multi-Lane

Author

Sai Yin Fang and Feng Li

Subjects
Transport engineering, Engineering, Traffic system, business.industry, Headway, General Engineering, Traffic flow, business, Car following, Automotive engineering
Abstract

Car-following is a radical traffic Car-following theory. Driving behavior and vehicles’ driving characteristic is very important in making intelligent traffic system. This paper investigates the headways of multi-lane, finds that there existed small headway in multi-lane highway in city Changchun, and its percentage can not be negligible, analyses several reasons of changing lanes in the car-following and the headway distributions with the abnormal behavior. Finally the theory small headway is generated by influence of traffic flow and the ratio of the left and right turning is concluded.

Published
2012
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