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Chu Y.M.,XuChang Vocational Technical College | Wang W.,Xuchang University
Applied Mechanics and Materials | Year: 2014

PID controller has widely used in control system for its simple structure, good control effect and strong robustness, the PI control strategy was introduced into rotor side converter of DFIG control with the mathematical models and the structure of stator flux-oriented vector control. Particle swam optimization algorithm was a new random optimization technology which has the features of rapid calculation speed. The PI controller design for RSC current loop and speed loop control was analyzed, and the PSO algorithm was presented for PI controller design, the simulation experiments demonstrated that the algorithm was suitable for the RSC control system with PSO remarkable search capability. © (2014) Trans Tech Publications, Switzerland.

Feng C.Y.,Xuchang Vocational Technical College
Advanced Materials Research | Year: 2013

Enhanced Geothermal Systems represent a series of technology, which use engineering methods to improve the performance of geothermal power plant. In some geothermal fields, the rocks are in high temperature but a low permeability, or the subsurface water is scarce. In these geological conditions, cool water was injected into the geothermal wells to fracture the tight rock and create man-made reservoir for thermal exploitation. Furthermore, these engineering methods can be utilized to improve the productivity of pre-existing hydrothermal power plants. To save water and treat the global warming, using carbon dioxide instead of water as working fluid was proposed. Numerical simulation reveals that the carbon dioxide has numerous advantages over water as working fluid in the heat mining process. The precipitation caused by carbon dioxide will restore part of carbon dioxide in the rock and reduce the micro-seismicity risk. © (2013) Trans Tech Publications, Switzerland.

Wang Y.L.,Xuchang Vocational Technical College | Zhang B.,Xuchang Vocational Technical College
Network Security and Communication Engineering - Proceedings of the 2014 International Conference on Network Security and Communication Engineering, NSCE 2014 | Year: 2015

SQL injection attack is currently the most common method of attacking from hackers. This paper describes the definition of SQL injection attacks, analyzes the principle of injection attacks and SQL injection and makes a comprehensive analysis about SQL injection attacks steps. For most sites the SQL injection vulnerabilities and constraints of strict filtering problems are presented, from webmasters and Web application, two measures of defense SQL injection attacks are given. © 2015 Taylor & Francis Group, London.

Ge H.Y.,Xuchang Vocational Technical College | Zhang J.T.,Xuchang Vocational Technical College
Network Security and Communication Engineering - Proceedings of the 2014 International Conference on Network Security and Communication Engineering, NSCE 2014 | Year: 2015

The common network storage technology is viewed, then FC SAN and IP SAN is introduced; finally a whole application programs of digital campus integrated network storage based on FC SAN and IP SAN technology for the current digital campus construction and development is proposed in this study, to meet challenges and requirements of data security faced by digital campus, with reliable storage and efficient use. © 2015 Taylor & Francis Group, London.

Wang W.,Xuchang University | Chu Y.M.,XuChang Vocational Technical College
Applied Mechanics and Materials | Year: 2014

DFIG based wind power generation system was connected to power grid with voltage source converters, the rotor side converter was analyzed and the control strategy was taken, the voltage and flux equations of the DFIG was analyzed, stator flux-oriented for RSC was adopted in the control system and with the control design based on stator flux-oriented (SFO) vector control. The RSC controller of DFIG was a double closed loop system, the rotor current control loop and power control loop was designed with PI, and the simulation shows the control feature. © (2014) Trans Tech Publications, Switzerland.

Wang X.,Xuchang Vocational Technical College
2010 International Conference on E-Product E-Service and E-Entertainment, ICEEE2010 | Year: 2010

The ecological-economic system of resource-dependent cities is compound system composed by the ecological system and economic system through certain technical means, environmental media and the process of human labor. It includes energy, material and information transmission. In order to maximize the value of the entire system and achieve the sustainable development of ecologicaleconomic systems, the paper explained the meaning of ecological-economic system, defined the three values form of the value system of ecological-economic system including economic value, social value and ecological value, analyzed the characteristics and changes rules of three values form in Resource-dependent cities in different stages of the life cycle, and obtained the establishment requirements of system's value equilibrium. ©2010 IEEE.

Yun Y.,Xuchang Vocational Technical College | Cui F.,Henan Normal University | Geng S.,Henan Normal University | Jin J.,Henan Normal University
Luminescence | Year: 2012

A novel method for the sensitive determination of bismuth(III) in pharmaceutical products using phosphoric acid as a molecular probe by resonance light scattering (RLS) is discussed. In 0.5 mol/L phosphoric acid (H 3PO 4) medium, bismuth(III) reacted with PO 4 3- to form an ion association compound, which resulted in the significant enhancement of RLS intensity and the appearance of the corresponding RLS spectral characteristics. The maximum scattering peak of the system existed at 364 nm. Under optimal conditions, there was linear relationship between the relative intensity of RLS and concentration of bismuth(III) in the range of 0.06-10.0 μg/mL for the system. A low detection limit for bismuth(III) of 3.22 ng/mL was achieved. The relative standard deviations (RSD) for the determination of 0.40 and 0.80 μg/mL bismuth(III) were 2.1% and 1.1%, respectively, for five determinations. Based on this fact, a simple, rapid, and sensitive method was developed for the determination of bismuth(III) at nanogram level by RLS technique with a common spectrofluorimeter. This analytical system was successfully applied to determine the trace amounts of bismuth(III) in pharmaceutical products, which was in good agreement with the results obtained by atomic absorption spectrometry (AAS). Copyright © 2011 John Wiley & Sons, Ltd.

En X.D.,Xuchang University | Zhili Z.,Xuchang Vocational Technical College
Proceedings - 2015 7th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2015 | Year: 2015

Baidu Map provides most of the path navigation in the cities, but it has some drawbacks in small regions, such as the incomplete description, updating not timely. Sometimes it will bring misleading for us. In this paper, a campus navigation system is designed based on Baidu map API, using PHP, JavaScript and xml technologies. The system can provide the basic map function and search the path navigation between any two points in the campus. First, draw the campus map in detail and cover it on the Baidu Map by using the Baidu Map API class. Then, reconstruct a campus's geographic information on the local database. At last, call the Baidu Map API Service class to draw the navigation path on the map. In this paper, in order to avoid the path spillover we proposed a method called "Local Bounding Box (LBB)", which solves the cross-border issues. © 2015 IEEE.

Liu Q.Y.,Xuchang Vocational Technical College
Applied Mechanics and Materials | Year: 2014

The random noise is the kind of noise with wide frequency band in seismic data detected by the optical acceleration sensors. The noises influence and destroy the useful signal of the seismic information. There are a lot of methods to remove noise and one of the standard methods to remove the noise of the signal was the fast Fourier transform (FFT) which was the linear Fourier smoothing. In this paper, the novel denoising method based on wavelet analysis was introduced. The denoising results of seismic data with the noise with FFT method and wavelet analysis method, respectively. SNRs of the signal with noise, FFT denoisng and wavelet analysis denoising are -8.69, -1.13, and 8.27 respectively. The results show that the wavelet analysis method is prior to the traditional denoising method. The resolution of the seismic data improves. © (2014) Trans Tech Publications, Switzerland.

Liu Q.Y.,Xuchang Vocational Technical College | Liu X.M.,Xuchang Vocational Technical College
Advanced Materials Research | Year: 2014

Three reinforcement materials with steel plate, epoxies resin sheet, and glass fiber sheet adhering to failed reinforced concrete beams (RC beams) were used to improve the bearing capacity of Reinforced Concrete beams in the paper. The test results shows all the three materials were proved satisfied with bearing capacity increasing request. Strengthening effects with steel plate and epoxies resin sheet were more obvious. © (2014) Trans Tech Publications, Switzerland.

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