Papers by Keyword: Coupling

Abstract: Based on the connotation and characteristics on cross coupling of industrialization and eco-environmental, the paper constructed the index system and measurement model on the coupling correlation evaluation of regional industrialization process and eco-environmental quality. The temporal feature of coupling factors and coupling degree between industrialization and eco-environmental in Inner Mongolia during 1990 to 2010 were analyzed. The results show: (1) The correlation degree of industrialization and eco-environmental in Inner Mongolia is between moderate to extremely close relationship, it shows that there is stronger coupling between industrialization and eco-environmental. (2) Environmental improvement and ecological protection are the main driving forces to promote the eco-environmental quality, industrial economy development is the stress factors for eco-environmental in Inner Mongolia. The feedback of eco-environment on industrialization is mainly on the support, restraint and limit function which the resource, environment, economy, science and technology factors on industrialization. (3) The coupling degree between industrialization and eco-environmental in Inner Mongolia has a fluctuation and stage feature. The coupling relation between industrialization and eco-environmental lies between the antagonistic period to running in stage.

Abstract: A novel design technique to improve the directivity of a microstrip direction coupler by a meandered structure with dielectric cover is proposed in this paper. Increasing of even-mode phase velocity by the proposed meandering method structure with dielectric cover is reported for the first time. An analytical method to obtain closed-form equations of even-mode, phase velocity is developed. The proposed structure is verified by experiments.

Abstract: A hydro-thermo-mechanical model was presented for concrete at elevated temperature. Three phases of continuum were adopted in this model: gaseous mixture of water vapor and dry air, liquid water, and solid skeleton of concrete. Mass conservation equations, linear momentum conservation equation, and energy conservation equation were derived on the basis of the macroscopic Navier-Stokes equations for a general continuum, along with assumptions made for the purpose of simplification. Mathematical relationships between selected primary variables and secondary variables were given with existing data from references. Specifications of the constitutive relations were made for the kinetic variables and their conjugate forces.

Abstract: The development of power line carry technology provides a new possibility way of reform for low-voltage feed switch. We want to find the realization methods and the key technologies of the communication module in the mine use low voltage flameproof feed switch. It also offering solutions in view of the possible interference, and partly using MATLAB simulation analysis methods to validate. Methods of this paper provide a guideline for the design of communication module in the mine use separated explosion low voltage switch.

Abstract: Nitrile butadiene rubber (NBR) comes into widespread applications due to the excellent performances, but it is susceptible to aging during its storage and usage periods. This paper surveys the external factors that act on the aging process of NBR. The aging of NBR in liquid environment, and non-liquid environment such as thermo-oxidative aging, ozone aging, stress aging and radiation aging, are considered. The emphasis of present works is test of physical and mechanical properties of NBR, and the micro analysis should gain special attention. One direction of future research on NBR aging is the coupling effects of various factors included in this paper.

Abstract: The multi-angle analysis of it, in terms of its level design, its track location, its contained culture, and its participants, indicated that challenge-taking program is a product in the context of Beijing Olympics in 2008 based on sports items, bringing into both entertainment and challenge and blended with Water Margin culture, enterprise culture, community culture, earthquake relief spirit, and physical culture, which has set off a national fitness craze. The tracks are mostly built in the holiday villages, science and technology parks, parks, water parks or scenic spots near the TV stations. This program has a coupling with such sports industry as sports competition performance industry, sports fitness and entertainment industry, sports tourism, and sports goods industry. Challenge-taking program is said to be a new carrier, through which sports industry is jointly developed with culture, tourism and other relative industries. The bold intervention of professional guidance in sports can not only promote scientific level of such programs, but also accelerate the construction of intangible sports industry by implanting sports goods advertisement and the upgrade of tangible sports industry by developing sports apparatus, bringing in new developing space of sports advertising and sports goods industry.

Abstract: On the basis of dynamics simulation software ADAMS, we built dynamics models of jaw crusher with multi-joint clearance. Contrast the link’s displacement, velocity, acceleration and the contact force between deputy campaign elements of the single joint clearance with the double joint clearance. Because the coupling superimposed of the double joint clearance, the velocity, acceleration and contact force is more complex. The whole is greater than the consideration of only a single joint clearance .But in some short period of time, there will be an acceleration that the contact force of the double joint clearance less than the single joint clearance. The dynamic characteristics analysis of multi-joint clearance is closer to the actual work of crusher.It can provide a theoretical basis for the control and optimization of the jaw crusher .

Abstract: Currently, the Chinese code calculate the wind loads of transmission towers and lines separately, the code methods make the loads of ground wire which was regarded as external loads force on the transmission tower, without considering the coupling effect between the tower and line, this method does not accord with the actual working state of the transmission tower. Therefore, according to the actual state of tower-tower-line coupling, this article established the finite element model of its system. What’s more, on the basis of different layout of damper system, the dynamic response and vibration reduction effect of the tower-line coupling system under different conditions were studied in this paper. The results show that, both can reduce the system’s vibration effectively while considering the tower-line coupling and with the consideration of different damper layout schemes at the same time. The third scheme which is tower head lower half part edge member bar plus dampers had the most significant vibration reduction effect. The research results can be reference for engineering design and engineering practice, it also has a certain theoretical and practical significance.

Abstract: The dynamic analysis of a turbine blade is carried out. The pre-stress due to rotation and fluid-thermal-structure coupling effect are considered. At first flow analysis and thermal analysis on the blade and corresponding stator-rotor blade passage are conducted to acquire the flow field and body temperature field of blade. Then stress in the blade is analyzed considering pressure and temperature in a static condition, and the matrix for pre-stress effect and an additional matrix due to the external temperature and pressure loading are obtained. And so the dynamic equation of the blade system including the pre-stress effect and the coupling effect is established. The frequencies and vibration modes of the blade system in six different coupling conditions are obtained by using of ANSYS and CFX. It is found that the fluid-thermal-structural coupling field has a significant influence on the blade natural frequencies. Also, the impact of temperature on frequency is embodied more in the change of material elastic modulus E with temperature than in the thermal stress caused by temperature gradient.

Abstract: Generally the cardiac pacemaker is supplied power by micro battery, but the battery lifetime is limited, the Wireless Power Transmission (WPT) technology is a new method to supply power source for the cardiac pacemaker. Firstly the structure of the WPT system in the cardiac pacemaker were introduced. Then, Coupling transformer and rectifying and regulating circuit were designed. Finally, the test system of the WPT in the cardiac pacemaker was established, and the resonance frequency was 596 kHz, When the work frequencywas equal to the resonance frequency, the output power was maximal; when the input voltage of the primary winding was 5.8V, the voltage of the cardiac pacemaker may be up to 8.8V, which could effectively drive the cardiac pacemaker Record S, the results show the design is feasible.