Advanced Materials Research Vols. 989-994

Abstract: The information of tropical crop production environment includes the wind velocity and direction data, light intensity, air humidity, air temperatures, soil moisture, concentration of carbon dioxide, rainfall and so on. These data will be of great reference value to environmental control and scientific field management. As the characteristics of tropical crop growth and tropical climate conditions, information acquisition and tracking about the environment of crop growth are quite behind the time. This research is precisely centers on this core question to launch, carrying on analysis on the key technology of intelligent sensor and monitoring about tropical crop production environment. We build a system on a tiny210 chip using android operating system. Sensors that will be linked include air humidity & temperature sensor, illumination sensor, soil moisture sensor, wind-direction sensor and wind power sensor. This research focuses on field information dynamic acquisition and management. This study can offer references for in field environmental control and further research work.

Abstract: In order to improve the cooling & purifying effect of exhaust, reducing the water-jetting phenomenon during working time, the waste-gas flow field simulation in water-washing tank of Explosion-Proof Diesel (EPD) was conducted through ANSYS CFX/Fluent. The results revealed the inner flow condition and outlet temperature of emissions in water-washing tank. It provided a reference for the future design and optimization of the water-washing tank of EPD.

Abstract: A variable density anisotropic turbulent buoyant jet model is applied for simulating the current field under waves. The numerical simulation results show the present model is efficient to describe the construction characteristic of current field. This model could be an efficient tool for sewage treatment by deep sea discharge.

Abstract: In the self-designed smart car, to control the speed and direction is the control core of the intelligent vehicle system . Due to hardware limitations, there is a delay in the smart car speed and direction control, which is adversely affected for the control of the smart car . For the above problems, the intelligent vehicle control will be applied by the feedforward and feedback control methods, the disturbance which is caused by the deviation will be treated in advance, Digital PID algorithm is improved , the incomplete differential and differential current algorithm is introduced to the PID algorithm to improve the dynamic performance of the system. Aftet this new algorithm is adopted, the dynamic performance of the intelligent vehicle system has been greatly improved.

Abstract: For vehicle external aerodynamic computation, the selection of the turbulence model is very important. In current research, ten RANS turbulence models were introduced to compute the time-averaged flow field around the Ahmed model with 25° backlight angle. In order to evaluate the feasibility of the turbulence model, the results were compared with the related published experimental data. The results showed that the two equations RANS turbulence models were more favorable to compute the vehicle external flow field, but parts of the two equations turbulence model just could predict the aerodynamic drag coefficient or lift coefficient effectively. However, the results further revealed that the realizable k-ε could obtain the more accurate drag coefficient and lift coefficient simultaneously, and simulate the complex separation flow in the wake.

Abstract: Performing characteristics on envelope composite of near space airship (NSA) are quite different from that of the low altitude airship essentially. The NSA envelope material should meet excellent applicative characteristics including light weight, high strength, anti-aging, anti-ultraviolet radiation, gas-tightness, weather resistance. Ground simulation test is critical for the envelope design and development process of NSA, and the environmental features of near space is analyzed for NSA, then corresponding ground simulation test methods are proposed to involve mechanical strength of the ground test methods among the changing weather temperature and over pressure changes, materials weather resistance and air tightness test. Finally the coupling relationship between various mechanical test and environmental test methods is also investigated.

Abstract: The structure of the air intake system directly affect the combustion and heat load in each cylinder. In this paper, using the CFD experience can look the intake pipe gas flow as a 3-D compressed steady flow. It is easy to built a 3-D model grids with the help of GAMBIT software .Using the FLUENT soft software ,it is reasonable to get the the fluid velocity distribution in flow field , and calculate the fluid flowing quality at the exit of manifold, as well as analyze the inhomogeneity of the inlet air.

Abstract: the paper briefly discusses the gas emission prediction method, puts forward the grey model prediction method combined with domestic actual, and according to the material of the absolute gas emission quantity of the mine in the past decade, sets up the GM (1, 1) metabolism model. By solving the model, predictions are given, and the results are tested. The paper draws the predicted value of the absolute gas emission quantity over the next five years, analyzes the overall trends and gives general advice.

Abstract: In the northern part of China, the heating system of the Chinese kang occupies a significant proportion of usage, particularly during the winter. To achieve better heating effect, this article explored the wind tunnel (commonly known as the “dog hole”) of the Chinese kang in the Northern area. The paper conducted three experiments, established a two-dimensional mathematical model on the flow of high temperature gas in the chimney, utilized the FLUENT software to simulate the flow, and analyzed the inlet flow of the chimney flue and effect of wind tunnel on the heating system of Chinese kang. Wind tunnel was found to prevent natural reversed wind effectively and reduce the influence of outside wind.

Abstract: The Ultraviolet/Optical Telescope (UVOT) which is one of three scientific instruments onboard the NASA-led Swift satellite provides simultaneous ultraviolet and optical photometric data. We present the installing procedures of HEASoft software and the detailed method for using the HEASoft in UVOT photometric data processions. We focus on the application of photometry processes, and present the photometry of Quasar PKS 0537-441. The analysis of the photometric data shows that this source has extreme variations in optical and ultraviolet bands and the shape of photometric flux curves in each band is excellently in agreement with each other.